/* * Copyright (c) 1997, 2024, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ #include "precompiled.hpp" #include "cds/cdsConfig.hpp" #include "classfile/classFileParser.hpp" #include "classfile/classFileStream.hpp" #include "classfile/classLoader.hpp" #include "classfile/classLoaderData.inline.hpp" #include "classfile/classLoadInfo.hpp" #include "classfile/defaultMethods.hpp" #include "classfile/fieldLayoutBuilder.hpp" #include "classfile/javaClasses.inline.hpp" #include "classfile/moduleEntry.hpp" #include "classfile/packageEntry.hpp" #include "classfile/symbolTable.hpp" #include "classfile/systemDictionary.hpp" #include "classfile/verificationType.hpp" #include "classfile/verifier.hpp" #include "classfile/vmClasses.hpp" #include "classfile/vmSymbols.hpp" #include "jvm.h" #include "logging/log.hpp" #include "logging/logStream.hpp" #include "memory/allocation.hpp" #include "memory/metadataFactory.hpp" #include "memory/oopFactory.hpp" #include "memory/resourceArea.hpp" #include "memory/universe.hpp" #include "oops/annotations.hpp" #include "oops/constantPool.inline.hpp" #include "oops/fieldInfo.hpp" #include "oops/fieldStreams.inline.hpp" #include "oops/instanceKlass.inline.hpp" #include "oops/instanceMirrorKlass.hpp" #include "oops/klass.inline.hpp" #include "oops/klassVtable.hpp" #include "oops/metadata.hpp" #include "oops/method.inline.hpp" #include "oops/oop.inline.hpp" #include "oops/recordComponent.hpp" #include "oops/symbol.hpp" #include "prims/jvmtiExport.hpp" #include "prims/jvmtiThreadState.hpp" #include "runtime/arguments.hpp" #include "runtime/fieldDescriptor.inline.hpp" #include "runtime/handles.inline.hpp" #include "runtime/javaCalls.hpp" #include "runtime/os.hpp" #include "runtime/perfData.hpp" #include "runtime/reflection.hpp" #include "runtime/safepointVerifiers.hpp" #include "runtime/signature.hpp" #include "runtime/timer.hpp" #include "services/classLoadingService.hpp" #include "services/threadService.hpp" #include "utilities/align.hpp" #include "utilities/bitMap.inline.hpp" #include "utilities/checkedCast.hpp" #include "utilities/copy.hpp" #include "utilities/formatBuffer.hpp" #include "utilities/exceptions.hpp" #include "utilities/globalDefinitions.hpp" #include "utilities/growableArray.hpp" #include "utilities/macros.hpp" #include "utilities/ostream.hpp" #include "utilities/resourceHash.hpp" #include "utilities/utf8.hpp" #if INCLUDE_CDS #include "classfile/systemDictionaryShared.hpp" #endif #if INCLUDE_JFR #include "jfr/support/jfrTraceIdExtension.hpp" #endif // We generally try to create the oops directly when parsing, rather than // allocating temporary data structures and copying the bytes twice. A // temporary area is only needed when parsing utf8 entries in the constant // pool and when parsing line number tables. // We add assert in debug mode when class format is not checked. #define JAVA_CLASSFILE_MAGIC 0xCAFEBABE #define JAVA_MIN_SUPPORTED_VERSION 45 #define JAVA_PREVIEW_MINOR_VERSION 65535 // Used for two backward compatibility reasons: // - to check for new additions to the class file format in JDK1.5 // - to check for bug fixes in the format checker in JDK1.5 #define JAVA_1_5_VERSION 49 // Used for backward compatibility reasons: // - to check for javac bug fixes that happened after 1.5 // - also used as the max version when running in jdk6 #define JAVA_6_VERSION 50 // Used for backward compatibility reasons: // - to disallow argument and require ACC_STATIC for methods #define JAVA_7_VERSION 51 // Extension method support. #define JAVA_8_VERSION 52 #define JAVA_9_VERSION 53 #define JAVA_10_VERSION 54 #define JAVA_11_VERSION 55 #define JAVA_12_VERSION 56 #define JAVA_13_VERSION 57 #define JAVA_14_VERSION 58 #define JAVA_15_VERSION 59 #define JAVA_16_VERSION 60 #define JAVA_17_VERSION 61 #define JAVA_18_VERSION 62 #define JAVA_19_VERSION 63 #define JAVA_20_VERSION 64 #define JAVA_21_VERSION 65 #define JAVA_22_VERSION 66 #define JAVA_23_VERSION 67 #define JAVA_24_VERSION 68 void ClassFileParser::set_class_bad_constant_seen(short bad_constant) { assert((bad_constant == JVM_CONSTANT_Module || bad_constant == JVM_CONSTANT_Package) && _major_version >= JAVA_9_VERSION, "Unexpected bad constant pool entry"); if (_bad_constant_seen == 0) _bad_constant_seen = bad_constant; } void ClassFileParser::parse_constant_pool_entries(const ClassFileStream* const stream, ConstantPool* cp, const int length, TRAPS) { assert(stream != nullptr, "invariant"); assert(cp != nullptr, "invariant"); // Use a local copy of ClassFileStream. It helps the C++ compiler to optimize // this function (_current can be allocated in a register, with scalar // replacement of aggregates). The _current pointer is copied back to // stream() when this function returns. DON'T call another method within // this method that uses stream(). const ClassFileStream cfs1 = *stream; const ClassFileStream* const cfs = &cfs1; debug_only(const u1* const old_current = stream->current();) // Used for batching symbol allocations. const char* names[SymbolTable::symbol_alloc_batch_size]; int lengths[SymbolTable::symbol_alloc_batch_size]; int indices[SymbolTable::symbol_alloc_batch_size]; unsigned int hashValues[SymbolTable::symbol_alloc_batch_size]; int names_count = 0; // parsing Index 0 is unused for (int index = 1; index < length; index++) { // Each of the following case guarantees one more byte in the stream // for the following tag or the access_flags following constant pool, // so we don't need bounds-check for reading tag. const u1 tag = cfs->get_u1_fast(); switch (tag) { case JVM_CONSTANT_Class : { cfs->guarantee_more(3, CHECK); // name_index, tag/access_flags const u2 name_index = cfs->get_u2_fast(); cp->klass_index_at_put(index, name_index); break; } case JVM_CONSTANT_Fieldref: { cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags const u2 class_index = cfs->get_u2_fast(); const u2 name_and_type_index = cfs->get_u2_fast(); cp->field_at_put(index, class_index, name_and_type_index); break; } case JVM_CONSTANT_Methodref: { cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags const u2 class_index = cfs->get_u2_fast(); const u2 name_and_type_index = cfs->get_u2_fast(); cp->method_at_put(index, class_index, name_and_type_index); break; } case JVM_CONSTANT_InterfaceMethodref: { cfs->guarantee_more(5, CHECK); // class_index, name_and_type_index, tag/access_flags const u2 class_index = cfs->get_u2_fast(); const u2 name_and_type_index = cfs->get_u2_fast(); cp->interface_method_at_put(index, class_index, name_and_type_index); break; } case JVM_CONSTANT_String : { cfs->guarantee_more(3, CHECK); // string_index, tag/access_flags const u2 string_index = cfs->get_u2_fast(); cp->string_index_at_put(index, string_index); break; } case JVM_CONSTANT_MethodHandle : case JVM_CONSTANT_MethodType: { if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { classfile_parse_error( "Class file version does not support constant tag %u in class file %s", tag, THREAD); return; } if (tag == JVM_CONSTANT_MethodHandle) { cfs->guarantee_more(4, CHECK); // ref_kind, method_index, tag/access_flags const u1 ref_kind = cfs->get_u1_fast(); const u2 method_index = cfs->get_u2_fast(); cp->method_handle_index_at_put(index, ref_kind, method_index); } else if (tag == JVM_CONSTANT_MethodType) { cfs->guarantee_more(3, CHECK); // signature_index, tag/access_flags const u2 signature_index = cfs->get_u2_fast(); cp->method_type_index_at_put(index, signature_index); } else { ShouldNotReachHere(); } break; } case JVM_CONSTANT_Dynamic : { if (_major_version < Verifier::DYNAMICCONSTANT_MAJOR_VERSION) { classfile_parse_error( "Class file version does not support constant tag %u in class file %s", tag, THREAD); return; } cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags const u2 bootstrap_specifier_index = cfs->get_u2_fast(); const u2 name_and_type_index = cfs->get_u2_fast(); if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later } cp->dynamic_constant_at_put(index, bootstrap_specifier_index, name_and_type_index); break; } case JVM_CONSTANT_InvokeDynamic : { if (_major_version < Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { classfile_parse_error( "Class file version does not support constant tag %u in class file %s", tag, THREAD); return; } cfs->guarantee_more(5, CHECK); // bsm_index, nt, tag/access_flags const u2 bootstrap_specifier_index = cfs->get_u2_fast(); const u2 name_and_type_index = cfs->get_u2_fast(); if (_max_bootstrap_specifier_index < (int) bootstrap_specifier_index) { _max_bootstrap_specifier_index = (int) bootstrap_specifier_index; // collect for later } cp->invoke_dynamic_at_put(index, bootstrap_specifier_index, name_and_type_index); break; } case JVM_CONSTANT_Integer: { cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags const u4 bytes = cfs->get_u4_fast(); cp->int_at_put(index, (jint)bytes); break; } case JVM_CONSTANT_Float: { cfs->guarantee_more(5, CHECK); // bytes, tag/access_flags const u4 bytes = cfs->get_u4_fast(); cp->float_at_put(index, *(jfloat*)&bytes); break; } case JVM_CONSTANT_Long: { // A mangled type might cause you to overrun allocated memory guarantee_property(index + 1 < length, "Invalid constant pool entry %u in class file %s", index, CHECK); cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags const u8 bytes = cfs->get_u8_fast(); cp->long_at_put(index, bytes); index++; // Skip entry following eigth-byte constant, see JVM book p. 98 break; } case JVM_CONSTANT_Double: { // A mangled type might cause you to overrun allocated memory guarantee_property(index+1 < length, "Invalid constant pool entry %u in class file %s", index, CHECK); cfs->guarantee_more(9, CHECK); // bytes, tag/access_flags const u8 bytes = cfs->get_u8_fast(); cp->double_at_put(index, *(jdouble*)&bytes); index++; // Skip entry following eigth-byte constant, see JVM book p. 98 break; } case JVM_CONSTANT_NameAndType: { cfs->guarantee_more(5, CHECK); // name_index, signature_index, tag/access_flags const u2 name_index = cfs->get_u2_fast(); const u2 signature_index = cfs->get_u2_fast(); cp->name_and_type_at_put(index, name_index, signature_index); break; } case JVM_CONSTANT_Utf8 : { cfs->guarantee_more(2, CHECK); // utf8_length u2 utf8_length = cfs->get_u2_fast(); const u1* utf8_buffer = cfs->current(); assert(utf8_buffer != nullptr, "null utf8 buffer"); // Got utf8 string, guarantee utf8_length+1 bytes, set stream position forward. cfs->guarantee_more(utf8_length+1, CHECK); // utf8 string, tag/access_flags cfs->skip_u1_fast(utf8_length); // Before storing the symbol, make sure it's legal if (_need_verify) { verify_legal_utf8(utf8_buffer, utf8_length, CHECK); } unsigned int hash; Symbol* const result = SymbolTable::lookup_only((const char*)utf8_buffer, utf8_length, hash); if (result == nullptr) { names[names_count] = (const char*)utf8_buffer; lengths[names_count] = utf8_length; indices[names_count] = index; hashValues[names_count++] = hash; if (names_count == SymbolTable::symbol_alloc_batch_size) { SymbolTable::new_symbols(_loader_data, constantPoolHandle(THREAD, cp), names_count, names, lengths, indices, hashValues); names_count = 0; } } else { cp->symbol_at_put(index, result); } break; } case JVM_CONSTANT_Module: case JVM_CONSTANT_Package: { // Record that an error occurred in these two cases but keep parsing so // that ACC_Module can be checked for in the access_flags. Need to // throw NoClassDefFoundError in that case. if (_major_version >= JAVA_9_VERSION) { cfs->guarantee_more(3, CHECK); cfs->get_u2_fast(); set_class_bad_constant_seen(tag); break; } } default: { classfile_parse_error("Unknown constant tag %u in class file %s", tag, THREAD); return; } } // end of switch(tag) } // end of for // Allocate the remaining symbols if (names_count > 0) { SymbolTable::new_symbols(_loader_data, constantPoolHandle(THREAD, cp), names_count, names, lengths, indices, hashValues); } // Copy _current pointer of local copy back to stream. assert(stream->current() == old_current, "non-exclusive use of stream"); stream->set_current(cfs1.current()); } static inline bool valid_cp_range(int index, int length) { return (index > 0 && index < length); } static inline Symbol* check_symbol_at(const ConstantPool* cp, int index) { assert(cp != nullptr, "invariant"); if (valid_cp_range(index, cp->length()) && cp->tag_at(index).is_utf8()) { return cp->symbol_at(index); } return nullptr; } void ClassFileParser::parse_constant_pool(const ClassFileStream* const stream, ConstantPool* const cp, const int length, TRAPS) { assert(cp != nullptr, "invariant"); assert(stream != nullptr, "invariant"); // parsing constant pool entries parse_constant_pool_entries(stream, cp, length, CHECK); if (class_bad_constant_seen() != 0) { // a bad CP entry has been detected previously so stop parsing and just return. return; } int index = 1; // declared outside of loops for portability int num_klasses = 0; // first verification pass - validate cross references // and fixup class and string constants for (index = 1; index < length; index++) { // Index 0 is unused const jbyte tag = cp->tag_at(index).value(); switch (tag) { case JVM_CONSTANT_Class: { ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present break; } case JVM_CONSTANT_Fieldref: // fall through case JVM_CONSTANT_Methodref: // fall through case JVM_CONSTANT_InterfaceMethodref: { if (!_need_verify) break; const int klass_ref_index = cp->uncached_klass_ref_index_at(index); const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index); guarantee_property(valid_klass_reference_at(klass_ref_index), "Invalid constant pool index %u in class file %s", klass_ref_index, CHECK); guarantee_property(valid_cp_range(name_and_type_ref_index, length) && cp->tag_at(name_and_type_ref_index).is_name_and_type(), "Invalid constant pool index %u in class file %s", name_and_type_ref_index, CHECK); break; } case JVM_CONSTANT_String: { ShouldNotReachHere(); // Only JVM_CONSTANT_StringIndex should be present break; } case JVM_CONSTANT_Integer: break; case JVM_CONSTANT_Float: break; case JVM_CONSTANT_Long: case JVM_CONSTANT_Double: { index++; guarantee_property( (index < length && cp->tag_at(index).is_invalid()), "Improper constant pool long/double index %u in class file %s", index, CHECK); break; } case JVM_CONSTANT_NameAndType: { if (!_need_verify) break; const int name_ref_index = cp->name_ref_index_at(index); const int signature_ref_index = cp->signature_ref_index_at(index); guarantee_property(valid_symbol_at(name_ref_index), "Invalid constant pool index %u in class file %s", name_ref_index, CHECK); guarantee_property(valid_symbol_at(signature_ref_index), "Invalid constant pool index %u in class file %s", signature_ref_index, CHECK); break; } case JVM_CONSTANT_Utf8: break; case JVM_CONSTANT_UnresolvedClass: // fall-through case JVM_CONSTANT_UnresolvedClassInError: { ShouldNotReachHere(); // Only JVM_CONSTANT_ClassIndex should be present break; } case JVM_CONSTANT_ClassIndex: { const int class_index = cp->klass_index_at(index); guarantee_property(valid_symbol_at(class_index), "Invalid constant pool index %u in class file %s", class_index, CHECK); cp->unresolved_klass_at_put(index, class_index, num_klasses++); break; } case JVM_CONSTANT_StringIndex: { const int string_index = cp->string_index_at(index); guarantee_property(valid_symbol_at(string_index), "Invalid constant pool index %u in class file %s", string_index, CHECK); Symbol* const sym = cp->symbol_at(string_index); cp->unresolved_string_at_put(index, sym); break; } case JVM_CONSTANT_MethodHandle: { const int ref_index = cp->method_handle_index_at(index); guarantee_property(valid_cp_range(ref_index, length), "Invalid constant pool index %u in class file %s", ref_index, CHECK); const constantTag tag = cp->tag_at(ref_index); const int ref_kind = cp->method_handle_ref_kind_at(index); switch (ref_kind) { case JVM_REF_getField: case JVM_REF_getStatic: case JVM_REF_putField: case JVM_REF_putStatic: { guarantee_property( tag.is_field(), "Invalid constant pool index %u in class file %s (not a field)", ref_index, CHECK); break; } case JVM_REF_invokeVirtual: case JVM_REF_newInvokeSpecial: { guarantee_property( tag.is_method(), "Invalid constant pool index %u in class file %s (not a method)", ref_index, CHECK); break; } case JVM_REF_invokeStatic: case JVM_REF_invokeSpecial: { guarantee_property( tag.is_method() || ((_major_version >= JAVA_8_VERSION) && tag.is_interface_method()), "Invalid constant pool index %u in class file %s (not a method)", ref_index, CHECK); break; } case JVM_REF_invokeInterface: { guarantee_property( tag.is_interface_method(), "Invalid constant pool index %u in class file %s (not an interface method)", ref_index, CHECK); break; } default: { classfile_parse_error( "Bad method handle kind at constant pool index %u in class file %s", index, THREAD); return; } } // switch(refkind) // Keep the ref_index unchanged. It will be indirected at link-time. break; } // case MethodHandle case JVM_CONSTANT_MethodType: { const int ref_index = cp->method_type_index_at(index); guarantee_property(valid_symbol_at(ref_index), "Invalid constant pool index %u in class file %s", ref_index, CHECK); break; } case JVM_CONSTANT_Dynamic: { const int name_and_type_ref_index = cp->bootstrap_name_and_type_ref_index_at(index); guarantee_property(valid_cp_range(name_and_type_ref_index, length) && cp->tag_at(name_and_type_ref_index).is_name_and_type(), "Invalid constant pool index %u in class file %s", name_and_type_ref_index, CHECK); // bootstrap specifier index must be checked later, // when BootstrapMethods attr is available // Mark the constant pool as having a CONSTANT_Dynamic_info structure cp->set_has_dynamic_constant(); break; } case JVM_CONSTANT_InvokeDynamic: { const int name_and_type_ref_index = cp->bootstrap_name_and_type_ref_index_at(index); guarantee_property(valid_cp_range(name_and_type_ref_index, length) && cp->tag_at(name_and_type_ref_index).is_name_and_type(), "Invalid constant pool index %u in class file %s", name_and_type_ref_index, CHECK); // bootstrap specifier index must be checked later, // when BootstrapMethods attr is available break; } default: { fatal("bad constant pool tag value %u", cp->tag_at(index).value()); ShouldNotReachHere(); break; } } // switch(tag) } // end of for cp->allocate_resolved_klasses(_loader_data, num_klasses, CHECK); if (!_need_verify) { return; } // second verification pass - checks the strings are of the right format. // but not yet to the other entries for (index = 1; index < length; index++) { const jbyte tag = cp->tag_at(index).value(); switch (tag) { case JVM_CONSTANT_UnresolvedClass: { const Symbol* const class_name = cp->klass_name_at(index); // check the name verify_legal_class_name(class_name, CHECK); break; } case JVM_CONSTANT_NameAndType: { if (_need_verify) { const int sig_index = cp->signature_ref_index_at(index); const int name_index = cp->name_ref_index_at(index); const Symbol* const name = cp->symbol_at(name_index); const Symbol* const sig = cp->symbol_at(sig_index); guarantee_property(sig->utf8_length() != 0, "Illegal zero length constant pool entry at %d in class %s", sig_index, CHECK); guarantee_property(name->utf8_length() != 0, "Illegal zero length constant pool entry at %d in class %s", name_index, CHECK); if (Signature::is_method(sig)) { // Format check method name and signature verify_legal_method_name(name, CHECK); verify_legal_method_signature(name, sig, CHECK); } else { // Format check field name and signature verify_legal_field_name(name, CHECK); verify_legal_field_signature(name, sig, CHECK); } } break; } case JVM_CONSTANT_Dynamic: { const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index); // already verified to be utf8 const int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); // already verified to be utf8 const int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); const Symbol* const name = cp->symbol_at(name_ref_index); const Symbol* const signature = cp->symbol_at(signature_ref_index); if (_need_verify) { // CONSTANT_Dynamic's name and signature are verified above, when iterating NameAndType_info. // Need only to be sure signature is the right type. if (Signature::is_method(signature)) { throwIllegalSignature("CONSTANT_Dynamic", name, signature, CHECK); } } break; } case JVM_CONSTANT_InvokeDynamic: case JVM_CONSTANT_Fieldref: case JVM_CONSTANT_Methodref: case JVM_CONSTANT_InterfaceMethodref: { const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(index); // already verified to be utf8 const int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); // already verified to be utf8 const int signature_ref_index = cp->signature_ref_index_at(name_and_type_ref_index); const Symbol* const name = cp->symbol_at(name_ref_index); const Symbol* const signature = cp->symbol_at(signature_ref_index); if (tag == JVM_CONSTANT_Fieldref) { if (_need_verify) { // Field name and signature are verified above, when iterating NameAndType_info. // Need only to be sure signature is non-zero length and the right type. if (Signature::is_method(signature)) { throwIllegalSignature("Field", name, signature, CHECK); } } } else { if (_need_verify) { // Method name and signature are individually verified above, when iterating // NameAndType_info. Need to check here that signature is non-zero length and // the right type. if (!Signature::is_method(signature)) { throwIllegalSignature("Method", name, signature, CHECK); } } // If a class method name begins with '<', it must be "" and have void signature. const unsigned int name_len = name->utf8_length(); if (tag == JVM_CONSTANT_Methodref && name_len != 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL) { if (name != vmSymbols::object_initializer_name()) { classfile_parse_error( "Bad method name at constant pool index %u in class file %s", name_ref_index, THREAD); return; } else if (!Signature::is_void_method(signature)) { // must have void signature. throwIllegalSignature("Method", name, signature, CHECK); } } } break; } case JVM_CONSTANT_MethodHandle: { const int ref_index = cp->method_handle_index_at(index); const int ref_kind = cp->method_handle_ref_kind_at(index); switch (ref_kind) { case JVM_REF_invokeVirtual: case JVM_REF_invokeStatic: case JVM_REF_invokeSpecial: case JVM_REF_newInvokeSpecial: { const int name_and_type_ref_index = cp->uncached_name_and_type_ref_index_at(ref_index); const int name_ref_index = cp->name_ref_index_at(name_and_type_ref_index); const Symbol* const name = cp->symbol_at(name_ref_index); if (ref_kind == JVM_REF_newInvokeSpecial) { if (name != vmSymbols::object_initializer_name()) { classfile_parse_error( "Bad constructor name at constant pool index %u in class file %s", name_ref_index, THREAD); return; } } else { if (name == vmSymbols::object_initializer_name()) { classfile_parse_error( "Bad method name at constant pool index %u in class file %s", name_ref_index, THREAD); return; } } break; } // Other ref_kinds are already fully checked in previous pass. } // switch(ref_kind) break; } case JVM_CONSTANT_MethodType: { const Symbol* const no_name = vmSymbols::type_name(); // place holder const Symbol* const signature = cp->method_type_signature_at(index); verify_legal_method_signature(no_name, signature, CHECK); break; } case JVM_CONSTANT_Utf8: { assert(cp->symbol_at(index)->refcount() != 0, "count corrupted"); } } // switch(tag) } // end of for } class NameSigHash: public ResourceObj { public: const Symbol* _name; // name const Symbol* _sig; // signature static const int HASH_ROW_SIZE = 256; NameSigHash(Symbol* name, Symbol* sig) : _name(name), _sig(sig) {} static unsigned int hash(NameSigHash const& namesig) { return namesig._name->identity_hash() ^ namesig._sig->identity_hash(); } static bool equals(NameSigHash const& e0, NameSigHash const& e1) { return (e0._name == e1._name) && (e0._sig == e1._sig); } }; using NameSigHashtable = ResourceHashtable; // Side-effects: populates the _local_interfaces field void ClassFileParser::parse_interfaces(const ClassFileStream* const stream, const int itfs_len, ConstantPool* const cp, bool* const has_nonstatic_concrete_methods, TRAPS) { assert(stream != nullptr, "invariant"); assert(cp != nullptr, "invariant"); assert(has_nonstatic_concrete_methods != nullptr, "invariant"); if (itfs_len == 0) { _local_interfaces = Universe::the_empty_instance_klass_array(); } else { assert(itfs_len > 0, "only called for len>0"); _local_interfaces = MetadataFactory::new_array(_loader_data, itfs_len, nullptr, CHECK); int index; for (index = 0; index < itfs_len; index++) { const u2 interface_index = stream->get_u2(CHECK); Klass* interf; guarantee_property( valid_klass_reference_at(interface_index), "Interface name has bad constant pool index %u in class file %s", interface_index, CHECK); if (cp->tag_at(interface_index).is_klass()) { interf = cp->resolved_klass_at(interface_index); } else { Symbol* const unresolved_klass = cp->klass_name_at(interface_index); // Don't need to check legal name because it's checked when parsing constant pool. // But need to make sure it's not an array type. guarantee_property(unresolved_klass->char_at(0) != JVM_SIGNATURE_ARRAY, "Bad interface name in class file %s", CHECK); // Call resolve on the interface class name with class circularity checking interf = SystemDictionary::resolve_super_or_fail(_class_name, unresolved_klass, Handle(THREAD, _loader_data->class_loader()), false, CHECK); } if (!interf->is_interface()) { THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), err_msg("class %s can not implement %s, because it is not an interface (%s)", _class_name->as_klass_external_name(), interf->external_name(), interf->class_in_module_of_loader())); } if (InstanceKlass::cast(interf)->has_nonstatic_concrete_methods()) { *has_nonstatic_concrete_methods = true; } _local_interfaces->at_put(index, InstanceKlass::cast(interf)); } if (!_need_verify || itfs_len <= 1) { return; } // Check if there's any duplicates in interfaces ResourceMark rm(THREAD); // Set containing interface names ResourceHashtable* interface_names = new ResourceHashtable(); for (index = 0; index < itfs_len; index++) { const InstanceKlass* const k = _local_interfaces->at(index); Symbol* interface_name = k->name(); // If no duplicates, add (name, nullptr) in hashtable interface_names. if (!interface_names->put(interface_name, 0)) { classfile_parse_error("Duplicate interface name \"%s\" in class file %s", interface_name->as_C_string(), THREAD); return; } } } } void ClassFileParser::verify_constantvalue(const ConstantPool* const cp, int constantvalue_index, int signature_index, TRAPS) const { // Make sure the constant pool entry is of a type appropriate to this field guarantee_property( (constantvalue_index > 0 && constantvalue_index < cp->length()), "Bad initial value index %u in ConstantValue attribute in class file %s", constantvalue_index, CHECK); const constantTag value_type = cp->tag_at(constantvalue_index); switch(cp->basic_type_for_signature_at(signature_index)) { case T_LONG: { guarantee_property(value_type.is_long(), "Inconsistent constant value type in class file %s", CHECK); break; } case T_FLOAT: { guarantee_property(value_type.is_float(), "Inconsistent constant value type in class file %s", CHECK); break; } case T_DOUBLE: { guarantee_property(value_type.is_double(), "Inconsistent constant value type in class file %s", CHECK); break; } case T_BYTE: case T_CHAR: case T_SHORT: case T_BOOLEAN: case T_INT: { guarantee_property(value_type.is_int(), "Inconsistent constant value type in class file %s", CHECK); break; } case T_OBJECT: { guarantee_property((cp->symbol_at(signature_index)->equals("Ljava/lang/String;") && value_type.is_string()), "Bad string initial value in class file %s", CHECK); break; } default: { classfile_parse_error("Unable to set initial value %u in class file %s", constantvalue_index, THREAD); } } } class AnnotationCollector : public ResourceObj{ public: enum Location { _in_field, _in_method, _in_class }; enum ID { _unknown = 0, _method_CallerSensitive, _method_ForceInline, _method_DontInline, _method_ChangesCurrentThread, _method_JvmtiHideEvents, _method_JvmtiMountTransition, _method_InjectedProfile, _method_LambdaForm_Compiled, _method_Hidden, _method_Scoped, _method_IntrinsicCandidate, _jdk_internal_vm_annotation_Contended, _field_Stable, _jdk_internal_vm_annotation_ReservedStackAccess, _jdk_internal_ValueBased, _java_lang_Deprecated, _java_lang_Deprecated_for_removal, _annotation_LIMIT }; const Location _location; int _annotations_present; u2 _contended_group; AnnotationCollector(Location location) : _location(location), _annotations_present(0), _contended_group(0) { assert((int)_annotation_LIMIT <= (int)sizeof(_annotations_present) * BitsPerByte, ""); } // If this annotation name has an ID, report it (or _none). ID annotation_index(const ClassLoaderData* loader_data, const Symbol* name, bool can_access_vm_annotations); // Set the annotation name: void set_annotation(ID id) { assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); _annotations_present |= (int)nth_bit((int)id); } void remove_annotation(ID id) { assert((int)id >= 0 && (int)id < (int)_annotation_LIMIT, "oob"); _annotations_present &= (int)~nth_bit((int)id); } // Report if the annotation is present. bool has_any_annotations() const { return _annotations_present != 0; } bool has_annotation(ID id) const { return (nth_bit((int)id) & _annotations_present) != 0; } void set_contended_group(u2 group) { _contended_group = group; } u2 contended_group() const { return _contended_group; } bool is_contended() const { return has_annotation(_jdk_internal_vm_annotation_Contended); } void set_stable(bool stable) { set_annotation(_field_Stable); } bool is_stable() const { return has_annotation(_field_Stable); } }; // This class also doubles as a holder for metadata cleanup. class ClassFileParser::FieldAnnotationCollector : public AnnotationCollector { private: ClassLoaderData* _loader_data; AnnotationArray* _field_annotations; AnnotationArray* _field_type_annotations; public: FieldAnnotationCollector(ClassLoaderData* loader_data) : AnnotationCollector(_in_field), _loader_data(loader_data), _field_annotations(nullptr), _field_type_annotations(nullptr) {} ~FieldAnnotationCollector(); void apply_to(FieldInfo* f); AnnotationArray* field_annotations() { return _field_annotations; } AnnotationArray* field_type_annotations() { return _field_type_annotations; } void set_field_annotations(AnnotationArray* a) { _field_annotations = a; } void set_field_type_annotations(AnnotationArray* a) { _field_type_annotations = a; } }; class MethodAnnotationCollector : public AnnotationCollector{ public: MethodAnnotationCollector() : AnnotationCollector(_in_method) { } void apply_to(const methodHandle& m); }; class ClassFileParser::ClassAnnotationCollector : public AnnotationCollector{ public: ClassAnnotationCollector() : AnnotationCollector(_in_class) { } void apply_to(InstanceKlass* ik); }; static int skip_annotation_value(const u1*, int, int); // fwd decl // Safely increment index by val if does not pass limit #define SAFE_ADD(index, limit, val) \ if (index >= limit - val) return limit; \ index += val; // Skip an annotation. Return >=limit if there is any problem. static int skip_annotation(const u1* buffer, int limit, int index) { assert(buffer != nullptr, "invariant"); // annotation := atype:u2 do(nmem:u2) {member:u2 value} // value := switch (tag:u1) { ... } SAFE_ADD(index, limit, 4); // skip atype and read nmem int nmem = Bytes::get_Java_u2((address)buffer + index - 2); while (--nmem >= 0 && index < limit) { SAFE_ADD(index, limit, 2); // skip member index = skip_annotation_value(buffer, limit, index); } return index; } // Skip an annotation value. Return >=limit if there is any problem. static int skip_annotation_value(const u1* buffer, int limit, int index) { assert(buffer != nullptr, "invariant"); // value := switch (tag:u1) { // case B, C, I, S, Z, D, F, J, c: con:u2; // case e: e_class:u2 e_name:u2; // case s: s_con:u2; // case [: do(nval:u2) {value}; // case @: annotation; // case s: s_con:u2; // } SAFE_ADD(index, limit, 1); // read tag const u1 tag = buffer[index - 1]; switch (tag) { case 'B': case 'C': case 'I': case 'S': case 'Z': case 'D': case 'F': case 'J': case 'c': case 's': SAFE_ADD(index, limit, 2); // skip con or s_con break; case 'e': SAFE_ADD(index, limit, 4); // skip e_class, e_name break; case '[': { SAFE_ADD(index, limit, 2); // read nval int nval = Bytes::get_Java_u2((address)buffer + index - 2); while (--nval >= 0 && index < limit) { index = skip_annotation_value(buffer, limit, index); } } break; case '@': index = skip_annotation(buffer, limit, index); break; default: return limit; // bad tag byte } return index; } // Sift through annotations, looking for those significant to the VM: static void parse_annotations(const ConstantPool* const cp, const u1* buffer, int limit, AnnotationCollector* coll, ClassLoaderData* loader_data, const bool can_access_vm_annotations) { assert(cp != nullptr, "invariant"); assert(buffer != nullptr, "invariant"); assert(coll != nullptr, "invariant"); assert(loader_data != nullptr, "invariant"); // annotations := do(nann:u2) {annotation} int index = 2; // read nann if (index >= limit) return; int nann = Bytes::get_Java_u2((address)buffer + index - 2); enum { // initial annotation layout atype_off = 0, // utf8 such as 'Ljava/lang/annotation/Retention;' count_off = 2, // u2 such as 1 (one value) member_off = 4, // utf8 such as 'value' tag_off = 6, // u1 such as 'c' (type) or 'e' (enum) e_tag_val = 'e', e_type_off = 7, // utf8 such as 'Ljava/lang/annotation/RetentionPolicy;' e_con_off = 9, // utf8 payload, such as 'SOURCE', 'CLASS', 'RUNTIME' e_size = 11, // end of 'e' annotation c_tag_val = 'c', // payload is type c_con_off = 7, // utf8 payload, such as 'I' c_size = 9, // end of 'c' annotation s_tag_val = 's', // payload is String s_con_off = 7, // utf8 payload, such as 'Ljava/lang/String;' s_size = 9, b_tag_val = 'Z', // payload is boolean min_size = 6 // smallest possible size (zero members) }; // Cannot add min_size to index in case of overflow MAX_INT while ((--nann) >= 0 && (index - 2 <= limit - min_size)) { int index0 = index; index = skip_annotation(buffer, limit, index); const u1* const abase = buffer + index0; const int atype = Bytes::get_Java_u2((address)abase + atype_off); const int count = Bytes::get_Java_u2((address)abase + count_off); const Symbol* const aname = check_symbol_at(cp, atype); if (aname == nullptr) break; // invalid annotation name const Symbol* member = nullptr; if (count >= 1) { const int member_index = Bytes::get_Java_u2((address)abase + member_off); member = check_symbol_at(cp, member_index); if (member == nullptr) break; // invalid member name } // Here is where parsing particular annotations will take place. AnnotationCollector::ID id = coll->annotation_index(loader_data, aname, can_access_vm_annotations); if (AnnotationCollector::_unknown == id) continue; coll->set_annotation(id); if (AnnotationCollector::_java_lang_Deprecated == id) { // @Deprecated can specify forRemoval=true, which we need // to record for JFR to use. If the annotation is not well-formed // then we may not be able to determine that. const u1* offset = abase + member_off; // There are only 2 members in @Deprecated. int n_members = MIN2(count, 2); for (int i = 0; i < n_members; ++i) { int member_index = Bytes::get_Java_u2((address)offset); offset += 2; member = check_symbol_at(cp, member_index); if (member == vmSymbols::since() && (*((address)offset) == s_tag_val)) { // Found `since` first so skip over it offset += 3; } else if (member == vmSymbols::for_removal() && (*((address)offset) == b_tag_val)) { const u2 boolean_value_index = Bytes::get_Java_u2((address)offset + 1); // No guarantee the entry is valid so check it refers to an int in the CP. if (cp->is_within_bounds(boolean_value_index) && cp->tag_at(boolean_value_index).is_int() && cp->int_at(boolean_value_index) == 1) { // forRemoval == true coll->set_annotation(AnnotationCollector::_java_lang_Deprecated_for_removal); } break; // no need to check further } else { // This @Deprecated annotation is malformed so we don't try to // determine whether forRemoval is set. break; } } continue; // proceed to next annotation } if (AnnotationCollector::_jdk_internal_vm_annotation_Contended == id) { // @Contended can optionally specify the contention group. // // Contended group defines the equivalence class over the fields: // the fields within the same contended group are not treated distinct. // The only exception is default group, which does not incur the // equivalence. Naturally, contention group for classes is meaningless. // // While the contention group is specified as String, annotation // values are already interned, and we might as well use the constant // pool index as the group tag. // u2 group_index = 0; // default contended group if (count == 1 && s_size == (index - index0) // match size && s_tag_val == *(abase + tag_off) && member == vmSymbols::value_name()) { group_index = Bytes::get_Java_u2((address)abase + s_con_off); // No guarantee the group_index is valid so check it refers to a // symbol in the CP. if (cp->is_within_bounds(group_index) && cp->tag_at(group_index).is_utf8()) { // Seems valid, so check for empty string and reset if (cp->symbol_at(group_index)->utf8_length() == 0) { group_index = 0; // default contended group } } else { // Not valid so use the default group_index = 0; } } coll->set_contended_group(group_index); continue; // proceed to next annotation } } } // Parse attributes for a field. void ClassFileParser::parse_field_attributes(const ClassFileStream* const cfs, u2 attributes_count, bool is_static, u2 signature_index, u2* const constantvalue_index_addr, bool* const is_synthetic_addr, u2* const generic_signature_index_addr, ClassFileParser::FieldAnnotationCollector* parsed_annotations, TRAPS) { assert(cfs != nullptr, "invariant"); assert(constantvalue_index_addr != nullptr, "invariant"); assert(is_synthetic_addr != nullptr, "invariant"); assert(generic_signature_index_addr != nullptr, "invariant"); assert(parsed_annotations != nullptr, "invariant"); assert(attributes_count > 0, "attributes_count should be greater than 0"); u2 constantvalue_index = 0; u2 generic_signature_index = 0; bool is_synthetic = false; const u1* runtime_visible_annotations = nullptr; int runtime_visible_annotations_length = 0; const u1* runtime_visible_type_annotations = nullptr; int runtime_visible_type_annotations_length = 0; bool runtime_invisible_annotations_exists = false; bool runtime_invisible_type_annotations_exists = false; const ConstantPool* const cp = _cp; while (attributes_count--) { cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length const u2 attribute_name_index = cfs->get_u2_fast(); const u4 attribute_length = cfs->get_u4_fast(); guarantee_property(valid_symbol_at(attribute_name_index), "Invalid field attribute index %u in class file %s", attribute_name_index, CHECK); const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); if (is_static && attribute_name == vmSymbols::tag_constant_value()) { // ignore if non-static if (constantvalue_index != 0) { classfile_parse_error("Duplicate ConstantValue attribute in class file %s", THREAD); return; } guarantee_property( attribute_length == 2, "Invalid ConstantValue field attribute length %u in class file %s", attribute_length, CHECK); constantvalue_index = cfs->get_u2(CHECK); if (_need_verify) { verify_constantvalue(cp, constantvalue_index, signature_index, CHECK); } } else if (attribute_name == vmSymbols::tag_synthetic()) { if (attribute_length != 0) { classfile_parse_error( "Invalid Synthetic field attribute length %u in class file %s", attribute_length, THREAD); return; } is_synthetic = true; } else if (attribute_name == vmSymbols::tag_deprecated()) { // 4276120 if (attribute_length != 0) { classfile_parse_error( "Invalid Deprecated field attribute length %u in class file %s", attribute_length, THREAD); return; } } else if (_major_version >= JAVA_1_5_VERSION) { if (attribute_name == vmSymbols::tag_signature()) { if (generic_signature_index != 0) { classfile_parse_error( "Multiple Signature attributes for field in class file %s", THREAD); return; } if (attribute_length != 2) { classfile_parse_error( "Wrong size %u for field's Signature attribute in class file %s", attribute_length, THREAD); return; } generic_signature_index = parse_generic_signature_attribute(cfs, CHECK); } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { if (runtime_visible_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleAnnotations attributes for field in class file %s", THREAD); return; } runtime_visible_annotations_length = attribute_length; runtime_visible_annotations = cfs->current(); assert(runtime_visible_annotations != nullptr, "null visible annotations"); cfs->guarantee_more(runtime_visible_annotations_length, CHECK); parse_annotations(cp, runtime_visible_annotations, runtime_visible_annotations_length, parsed_annotations, _loader_data, _can_access_vm_annotations); cfs->skip_u1_fast(runtime_visible_annotations_length); } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { if (runtime_invisible_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleAnnotations attributes for field in class file %s", THREAD); return; } runtime_invisible_annotations_exists = true; cfs->skip_u1(attribute_length, CHECK); } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { if (runtime_visible_type_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleTypeAnnotations attributes for field in class file %s", THREAD); return; } runtime_visible_type_annotations_length = attribute_length; runtime_visible_type_annotations = cfs->current(); assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { if (runtime_invisible_type_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleTypeAnnotations attributes for field in class file %s", THREAD); return; } else { runtime_invisible_type_annotations_exists = true; } cfs->skip_u1(attribute_length, CHECK); } else { cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes } } else { cfs->skip_u1(attribute_length, CHECK); // Skip unknown attributes } } *constantvalue_index_addr = constantvalue_index; *is_synthetic_addr = is_synthetic; *generic_signature_index_addr = generic_signature_index; AnnotationArray* a = allocate_annotations(runtime_visible_annotations, runtime_visible_annotations_length, CHECK); parsed_annotations->set_field_annotations(a); a = allocate_annotations(runtime_visible_type_annotations, runtime_visible_type_annotations_length, CHECK); parsed_annotations->set_field_type_annotations(a); return; } // Side-effects: populates the _fields, _fields_annotations, // _fields_type_annotations fields void ClassFileParser::parse_fields(const ClassFileStream* const cfs, bool is_interface, ConstantPool* cp, const int cp_size, u2* const java_fields_count_ptr, TRAPS) { assert(cfs != nullptr, "invariant"); assert(cp != nullptr, "invariant"); assert(java_fields_count_ptr != nullptr, "invariant"); assert(nullptr == _fields_annotations, "invariant"); assert(nullptr == _fields_type_annotations, "invariant"); cfs->guarantee_more(2, CHECK); // length const u2 length = cfs->get_u2_fast(); *java_fields_count_ptr = length; int num_injected = 0; const InjectedField* const injected = JavaClasses::get_injected(_class_name, &num_injected); const int total_fields = length + num_injected; // Allocate a temporary resource array to collect field data. // After parsing all fields, data are stored in a UNSIGNED5 compressed stream. _temp_field_info = new GrowableArray(total_fields); ResourceMark rm(THREAD); for (int n = 0; n < length; n++) { // access_flags, name_index, descriptor_index, attributes_count cfs->guarantee_more(8, CHECK); AccessFlags access_flags; const jint flags = cfs->get_u2_fast() & JVM_RECOGNIZED_FIELD_MODIFIERS; verify_legal_field_modifiers(flags, is_interface, CHECK); access_flags.set_flags(flags); FieldInfo::FieldFlags fieldFlags(0); const u2 name_index = cfs->get_u2_fast(); guarantee_property(valid_symbol_at(name_index), "Invalid constant pool index %u for field name in class file %s", name_index, CHECK); const Symbol* const name = cp->symbol_at(name_index); verify_legal_field_name(name, CHECK); const u2 signature_index = cfs->get_u2_fast(); guarantee_property(valid_symbol_at(signature_index), "Invalid constant pool index %u for field signature in class file %s", signature_index, CHECK); const Symbol* const sig = cp->symbol_at(signature_index); verify_legal_field_signature(name, sig, CHECK); u2 constantvalue_index = 0; bool is_synthetic = false; u2 generic_signature_index = 0; const bool is_static = access_flags.is_static(); FieldAnnotationCollector parsed_annotations(_loader_data); const u2 attributes_count = cfs->get_u2_fast(); if (attributes_count > 0) { parse_field_attributes(cfs, attributes_count, is_static, signature_index, &constantvalue_index, &is_synthetic, &generic_signature_index, &parsed_annotations, CHECK); if (parsed_annotations.field_annotations() != nullptr) { if (_fields_annotations == nullptr) { _fields_annotations = MetadataFactory::new_array( _loader_data, length, nullptr, CHECK); } _fields_annotations->at_put(n, parsed_annotations.field_annotations()); parsed_annotations.set_field_annotations(nullptr); } if (parsed_annotations.field_type_annotations() != nullptr) { if (_fields_type_annotations == nullptr) { _fields_type_annotations = MetadataFactory::new_array(_loader_data, length, nullptr, CHECK); } _fields_type_annotations->at_put(n, parsed_annotations.field_type_annotations()); parsed_annotations.set_field_type_annotations(nullptr); } if (is_synthetic) { access_flags.set_is_synthetic(); } if (generic_signature_index != 0) { fieldFlags.update_generic(true); } } const BasicType type = cp->basic_type_for_signature_at(signature_index); // Update number of static oop fields. if (is_static && is_reference_type(type)) { _static_oop_count++; } FieldInfo fi(access_flags, name_index, signature_index, constantvalue_index, fieldFlags); fi.set_index(n); if (fieldFlags.is_generic()) { fi.set_generic_signature_index(generic_signature_index); } parsed_annotations.apply_to(&fi); if (fi.field_flags().is_contended()) { _has_contended_fields = true; } _temp_field_info->append(fi); } assert(_temp_field_info->length() == length, "Must be"); int index = length; if (num_injected != 0) { for (int n = 0; n < num_injected; n++) { // Check for duplicates if (injected[n].may_be_java) { const Symbol* const name = injected[n].name(); const Symbol* const signature = injected[n].signature(); bool duplicate = false; for (int i = 0; i < length; i++) { const FieldInfo* const f = _temp_field_info->adr_at(i); if (name == cp->symbol_at(f->name_index()) && signature == cp->symbol_at(f->signature_index())) { // Symbol is desclared in Java so skip this one duplicate = true; break; } } if (duplicate) { // These will be removed from the field array at the end continue; } } // Injected field FieldInfo::FieldFlags fflags(0); fflags.update_injected(true); AccessFlags aflags; FieldInfo fi(aflags, (u2)(injected[n].name_index), (u2)(injected[n].signature_index), 0, fflags); fi.set_index(index); _temp_field_info->append(fi); index++; } } assert(_temp_field_info->length() == index, "Must be"); if (_need_verify && length > 1) { // Check duplicated fields ResourceMark rm(THREAD); // Set containing name-signature pairs NameSigHashtable* names_and_sigs = new NameSigHashtable(); for (int i = 0; i < _temp_field_info->length(); i++) { NameSigHash name_and_sig(_temp_field_info->adr_at(i)->name(_cp), _temp_field_info->adr_at(i)->signature(_cp)); // If no duplicates, add name/signature in hashtable names_and_sigs. if(!names_and_sigs->put(name_and_sig, 0)) { classfile_parse_error("Duplicate field name \"%s\" with signature \"%s\" in class file %s", name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD); return; } } } } const ClassFileParser::unsafe_u2* ClassFileParser::parse_exception_table(const ClassFileStream* const cfs, u4 code_length, u4 exception_table_length, TRAPS) { assert(cfs != nullptr, "invariant"); const unsafe_u2* const exception_table_start = cfs->current(); assert(exception_table_start != nullptr, "null exception table"); cfs->guarantee_more(8 * exception_table_length, CHECK_NULL); // start_pc, // end_pc, // handler_pc, // catch_type_index // Will check legal target after parsing code array in verifier. if (_need_verify) { for (unsigned int i = 0; i < exception_table_length; i++) { const u2 start_pc = cfs->get_u2_fast(); const u2 end_pc = cfs->get_u2_fast(); const u2 handler_pc = cfs->get_u2_fast(); const u2 catch_type_index = cfs->get_u2_fast(); guarantee_property((start_pc < end_pc) && (end_pc <= code_length), "Illegal exception table range in class file %s", CHECK_NULL); guarantee_property(handler_pc < code_length, "Illegal exception table handler in class file %s", CHECK_NULL); if (catch_type_index != 0) { guarantee_property(valid_klass_reference_at(catch_type_index), "Catch type in exception table has bad constant type in class file %s", CHECK_NULL); } } } else { cfs->skip_u2_fast(exception_table_length * 4); } return exception_table_start; } void ClassFileParser::parse_linenumber_table(u4 code_attribute_length, u4 code_length, CompressedLineNumberWriteStream**const write_stream, TRAPS) { const ClassFileStream* const cfs = _stream; unsigned int num_entries = cfs->get_u2(CHECK); // Each entry is a u2 start_pc, and a u2 line_number const unsigned int length_in_bytes = num_entries * (sizeof(u2) * 2); // Verify line number attribute and table length guarantee_property( code_attribute_length == sizeof(u2) + length_in_bytes, "LineNumberTable attribute has wrong length in class file %s", CHECK); cfs->guarantee_more(length_in_bytes, CHECK); if ((*write_stream) == nullptr) { if (length_in_bytes > fixed_buffer_size) { (*write_stream) = new CompressedLineNumberWriteStream(length_in_bytes); } else { (*write_stream) = new CompressedLineNumberWriteStream( _linenumbertable_buffer, fixed_buffer_size); } } while (num_entries-- > 0) { const u2 bci = cfs->get_u2_fast(); // start_pc const u2 line = cfs->get_u2_fast(); // line_number guarantee_property(bci < code_length, "Invalid pc in LineNumberTable in class file %s", CHECK); (*write_stream)->write_pair(bci, line); } } class LVT_Hash : public AllStatic { public: static bool equals(LocalVariableTableElement const& e0, LocalVariableTableElement const& e1) { /* * 3-tuple start_bci/length/slot has to be unique key, * so the following comparison seems to be redundant: * && elem->name_cp_index == entry->_elem->name_cp_index */ return (e0.start_bci == e1.start_bci && e0.length == e1.length && e0.name_cp_index == e1.name_cp_index && e0.slot == e1.slot); } static unsigned int hash(LocalVariableTableElement const& e0) { unsigned int raw_hash = e0.start_bci; raw_hash = e0.length + raw_hash * 37; raw_hash = e0.name_cp_index + raw_hash * 37; raw_hash = e0.slot + raw_hash * 37; return raw_hash; } }; // Class file LocalVariableTable elements. class Classfile_LVT_Element { public: u2 start_bci; u2 length; u2 name_cp_index; u2 descriptor_cp_index; u2 slot; }; static void copy_lvt_element(const Classfile_LVT_Element* const src, LocalVariableTableElement* const lvt) { lvt->start_bci = Bytes::get_Java_u2((u1*) &src->start_bci); lvt->length = Bytes::get_Java_u2((u1*) &src->length); lvt->name_cp_index = Bytes::get_Java_u2((u1*) &src->name_cp_index); lvt->descriptor_cp_index = Bytes::get_Java_u2((u1*) &src->descriptor_cp_index); lvt->signature_cp_index = 0; lvt->slot = Bytes::get_Java_u2((u1*) &src->slot); } // Function is used to parse both attributes: // LocalVariableTable (LVT) and LocalVariableTypeTable (LVTT) const ClassFileParser::unsafe_u2* ClassFileParser::parse_localvariable_table(const ClassFileStream* cfs, u4 code_length, u2 max_locals, u4 code_attribute_length, u2* const localvariable_table_length, bool isLVTT, TRAPS) { const char* const tbl_name = (isLVTT) ? "LocalVariableTypeTable" : "LocalVariableTable"; *localvariable_table_length = cfs->get_u2(CHECK_NULL); const unsigned int size = checked_cast( (*localvariable_table_length) * sizeof(Classfile_LVT_Element) / sizeof(u2)); const ConstantPool* const cp = _cp; // Verify local variable table attribute has right length if (_need_verify) { guarantee_property(code_attribute_length == (sizeof(*localvariable_table_length) + size * sizeof(u2)), "%s has wrong length in class file %s", tbl_name, CHECK_NULL); } const unsafe_u2* const localvariable_table_start = cfs->current(); assert(localvariable_table_start != nullptr, "null local variable table"); if (!_need_verify) { cfs->skip_u2_fast(size); } else { cfs->guarantee_more(size * 2, CHECK_NULL); for(int i = 0; i < (*localvariable_table_length); i++) { const u2 start_pc = cfs->get_u2_fast(); const u2 length = cfs->get_u2_fast(); const u2 name_index = cfs->get_u2_fast(); const u2 descriptor_index = cfs->get_u2_fast(); const u2 index = cfs->get_u2_fast(); // Assign to a u4 to avoid overflow const u4 end_pc = (u4)start_pc + (u4)length; if (start_pc >= code_length) { classfile_parse_error( "Invalid start_pc %u in %s in class file %s", start_pc, tbl_name, THREAD); return nullptr; } if (end_pc > code_length) { classfile_parse_error( "Invalid length %u in %s in class file %s", length, tbl_name, THREAD); return nullptr; } const int cp_size = cp->length(); guarantee_property(valid_symbol_at(name_index), "Name index %u in %s has bad constant type in class file %s", name_index, tbl_name, CHECK_NULL); guarantee_property(valid_symbol_at(descriptor_index), "Signature index %u in %s has bad constant type in class file %s", descriptor_index, tbl_name, CHECK_NULL); const Symbol* const name = cp->symbol_at(name_index); const Symbol* const sig = cp->symbol_at(descriptor_index); verify_legal_field_name(name, CHECK_NULL); u2 extra_slot = 0; if (!isLVTT) { verify_legal_field_signature(name, sig, CHECK_NULL); // 4894874: check special cases for double and long local variables if (sig == vmSymbols::type_signature(T_DOUBLE) || sig == vmSymbols::type_signature(T_LONG)) { extra_slot = 1; } } guarantee_property((index + extra_slot) < max_locals, "Invalid index %u in %s in class file %s", index, tbl_name, CHECK_NULL); } } return localvariable_table_start; } static const u1* parse_stackmap_table(const ClassFileStream* const cfs, u4 code_attribute_length, TRAPS) { assert(cfs != nullptr, "invariant"); if (0 == code_attribute_length) { return nullptr; } const u1* const stackmap_table_start = cfs->current(); assert(stackmap_table_start != nullptr, "null stackmap table"); // check code_attribute_length cfs->skip_u1(code_attribute_length, CHECK_NULL); return stackmap_table_start; } const ClassFileParser::unsafe_u2* ClassFileParser::parse_checked_exceptions(const ClassFileStream* const cfs, u2* const checked_exceptions_length, u4 method_attribute_length, TRAPS) { assert(cfs != nullptr, "invariant"); assert(checked_exceptions_length != nullptr, "invariant"); cfs->guarantee_more(2, CHECK_NULL); // checked_exceptions_length *checked_exceptions_length = cfs->get_u2_fast(); const unsigned int size = (*checked_exceptions_length) * sizeof(CheckedExceptionElement) / sizeof(u2); const unsafe_u2* const checked_exceptions_start = cfs->current(); assert(checked_exceptions_start != nullptr, "null checked exceptions"); if (!_need_verify) { cfs->skip_u2_fast(size); } else { // Verify each value in the checked exception table u2 checked_exception; const u2 len = *checked_exceptions_length; cfs->guarantee_more(2 * len, CHECK_NULL); for (int i = 0; i < len; i++) { checked_exception = cfs->get_u2_fast(); guarantee_property( valid_klass_reference_at(checked_exception), "Exception name has bad type at constant pool %u in class file %s", checked_exception, CHECK_NULL); } } // check exceptions attribute length if (_need_verify) { guarantee_property(method_attribute_length == (sizeof(*checked_exceptions_length) + sizeof(u2) * size), "Exceptions attribute has wrong length in class file %s", CHECK_NULL); } return checked_exceptions_start; } void ClassFileParser::throwIllegalSignature(const char* type, const Symbol* name, const Symbol* sig, TRAPS) const { assert(name != nullptr, "invariant"); assert(sig != nullptr, "invariant"); ResourceMark rm(THREAD); Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "%s \"%s\" in class %s has illegal signature \"%s\"", type, name->as_C_string(), _class_name->as_C_string(), sig->as_C_string()); } AnnotationCollector::ID AnnotationCollector::annotation_index(const ClassLoaderData* loader_data, const Symbol* name, const bool can_access_vm_annotations) { const vmSymbolID sid = vmSymbols::find_sid(name); // Privileged code can use all annotations. Other code silently drops some. const bool privileged = loader_data->is_boot_class_loader_data() || loader_data->is_platform_class_loader_data() || can_access_vm_annotations; switch (sid) { case VM_SYMBOL_ENUM_NAME(reflect_CallerSensitive_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_CallerSensitive; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ForceInline_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_ForceInline; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_DontInline_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_DontInline; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ChangesCurrentThread_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_ChangesCurrentThread; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiHideEvents_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_JvmtiHideEvents; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_JvmtiMountTransition_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_JvmtiMountTransition; } case VM_SYMBOL_ENUM_NAME(java_lang_invoke_InjectedProfile_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_InjectedProfile; } case VM_SYMBOL_ENUM_NAME(java_lang_invoke_LambdaForm_Compiled_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_LambdaForm_Compiled; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Hidden_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_Hidden; } case VM_SYMBOL_ENUM_NAME(jdk_internal_misc_Scoped_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_Scoped; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_IntrinsicCandidate_signature): { if (_location != _in_method) break; // only allow for methods if (!privileged) break; // only allow in privileged code return _method_IntrinsicCandidate; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Stable_signature): { if (_location != _in_field) break; // only allow for fields if (!privileged) break; // only allow in privileged code return _field_Stable; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_Contended_signature): { if (_location != _in_field && _location != _in_class) { break; // only allow for fields and classes } if (!EnableContended || (RestrictContended && !privileged)) { break; // honor privileges } return _jdk_internal_vm_annotation_Contended; } case VM_SYMBOL_ENUM_NAME(jdk_internal_vm_annotation_ReservedStackAccess_signature): { if (_location != _in_method) break; // only allow for methods if (RestrictReservedStack && !privileged) break; // honor privileges return _jdk_internal_vm_annotation_ReservedStackAccess; } case VM_SYMBOL_ENUM_NAME(jdk_internal_ValueBased_signature): { if (_location != _in_class) break; // only allow for classes if (!privileged) break; // only allow in privileged code return _jdk_internal_ValueBased; } case VM_SYMBOL_ENUM_NAME(java_lang_Deprecated): { return _java_lang_Deprecated; } default: { break; } } return AnnotationCollector::_unknown; } void ClassFileParser::FieldAnnotationCollector::apply_to(FieldInfo* f) { if (is_contended()) // Setting the contended group also sets the contended bit in field flags f->set_contended_group(contended_group()); if (is_stable()) (f->field_flags_addr())->update_stable(true); } ClassFileParser::FieldAnnotationCollector::~FieldAnnotationCollector() { // If there's an error deallocate metadata for field annotations MetadataFactory::free_array(_loader_data, _field_annotations); MetadataFactory::free_array(_loader_data, _field_type_annotations); } void MethodAnnotationCollector::apply_to(const methodHandle& m) { if (has_annotation(_method_CallerSensitive)) m->set_caller_sensitive(); if (has_annotation(_method_ForceInline)) m->set_force_inline(); if (has_annotation(_method_DontInline)) m->set_dont_inline(); if (has_annotation(_method_ChangesCurrentThread)) m->set_changes_current_thread(); if (has_annotation(_method_JvmtiHideEvents)) m->set_jvmti_hide_events(); if (has_annotation(_method_JvmtiMountTransition)) m->set_jvmti_mount_transition(); if (has_annotation(_method_InjectedProfile)) m->set_has_injected_profile(); if (has_annotation(_method_LambdaForm_Compiled) && m->intrinsic_id() == vmIntrinsics::_none) m->set_intrinsic_id(vmIntrinsics::_compiledLambdaForm); if (has_annotation(_method_Hidden)) m->set_is_hidden(); if (has_annotation(_method_Scoped)) m->set_scoped(); if (has_annotation(_method_IntrinsicCandidate) && !m->is_synthetic()) m->set_intrinsic_candidate(); if (has_annotation(_jdk_internal_vm_annotation_ReservedStackAccess)) m->set_has_reserved_stack_access(); if (has_annotation(_java_lang_Deprecated)) m->set_deprecated(); if (has_annotation(_java_lang_Deprecated_for_removal)) m->set_deprecated_for_removal(); } void ClassFileParser::ClassAnnotationCollector::apply_to(InstanceKlass* ik) { assert(ik != nullptr, "invariant"); if (has_annotation(_jdk_internal_vm_annotation_Contended)) { ik->set_is_contended(is_contended()); } if (has_annotation(_jdk_internal_ValueBased)) { ik->set_has_value_based_class_annotation(); if (DiagnoseSyncOnValueBasedClasses) { ik->set_is_value_based(); } } if (has_annotation(_java_lang_Deprecated)) { Array* methods = ik->methods(); int length = ik->methods()->length(); for (int i = 0; i < length; i++) { Method* m = methods->at(i); m->set_deprecated(); } } if (has_annotation(_java_lang_Deprecated_for_removal)) { Array* methods = ik->methods(); int length = ik->methods()->length(); for (int i = 0; i < length; i++) { Method* m = methods->at(i); m->set_deprecated_for_removal(); } } } #define MAX_ARGS_SIZE 255 #define MAX_CODE_SIZE 65535 #define INITIAL_MAX_LVT_NUMBER 256 /* Copy class file LVT's/LVTT's into the HotSpot internal LVT. * * Rules for LVT's and LVTT's are: * - There can be any number of LVT's and LVTT's. * - If there are n LVT's, it is the same as if there was just * one LVT containing all the entries from the n LVT's. * - There may be no more than one LVT entry per local variable. * Two LVT entries are 'equal' if these fields are the same: * start_pc, length, name, slot * - There may be no more than one LVTT entry per each LVT entry. * Each LVTT entry has to match some LVT entry. * - HotSpot internal LVT keeps natural ordering of class file LVT entries. */ void ClassFileParser::copy_localvariable_table(const ConstMethod* cm, int lvt_cnt, u2* const localvariable_table_length, const unsafe_u2** const localvariable_table_start, int lvtt_cnt, u2* const localvariable_type_table_length, const unsafe_u2** const localvariable_type_table_start, TRAPS) { ResourceMark rm(THREAD); typedef ResourceHashtable LVT_HashTable; LVT_HashTable* const table = new LVT_HashTable(); // To fill LocalVariableTable in const Classfile_LVT_Element* cf_lvt; LocalVariableTableElement* lvt = cm->localvariable_table_start(); for (int tbl_no = 0; tbl_no < lvt_cnt; tbl_no++) { cf_lvt = (Classfile_LVT_Element *) localvariable_table_start[tbl_no]; for (int idx = 0; idx < localvariable_table_length[tbl_no]; idx++, lvt++) { copy_lvt_element(&cf_lvt[idx], lvt); // If no duplicates, add LVT elem in hashtable. if (table->put(*lvt, lvt) == false && _need_verify && _major_version >= JAVA_1_5_VERSION) { classfile_parse_error("Duplicated LocalVariableTable attribute " "entry for '%s' in class file %s", _cp->symbol_at(lvt->name_cp_index)->as_utf8(), THREAD); return; } } } // To merge LocalVariableTable and LocalVariableTypeTable const Classfile_LVT_Element* cf_lvtt; LocalVariableTableElement lvtt_elem; for (int tbl_no = 0; tbl_no < lvtt_cnt; tbl_no++) { cf_lvtt = (Classfile_LVT_Element *) localvariable_type_table_start[tbl_no]; for (int idx = 0; idx < localvariable_type_table_length[tbl_no]; idx++) { copy_lvt_element(&cf_lvtt[idx], &lvtt_elem); LocalVariableTableElement** entry = table->get(lvtt_elem); if (entry == nullptr) { if (_need_verify) { classfile_parse_error("LVTT entry for '%s' in class file %s " "does not match any LVT entry", _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), THREAD); return; } } else if ((*entry)->signature_cp_index != 0 && _need_verify) { classfile_parse_error("Duplicated LocalVariableTypeTable attribute " "entry for '%s' in class file %s", _cp->symbol_at(lvtt_elem.name_cp_index)->as_utf8(), THREAD); return; } else { // to add generic signatures into LocalVariableTable (*entry)->signature_cp_index = lvtt_elem.descriptor_cp_index; } } } } void ClassFileParser::copy_method_annotations(ConstMethod* cm, const u1* runtime_visible_annotations, int runtime_visible_annotations_length, const u1* runtime_visible_parameter_annotations, int runtime_visible_parameter_annotations_length, const u1* runtime_visible_type_annotations, int runtime_visible_type_annotations_length, const u1* annotation_default, int annotation_default_length, TRAPS) { AnnotationArray* a; if (runtime_visible_annotations_length > 0) { a = allocate_annotations(runtime_visible_annotations, runtime_visible_annotations_length, CHECK); cm->set_method_annotations(a); } if (runtime_visible_parameter_annotations_length > 0) { a = allocate_annotations(runtime_visible_parameter_annotations, runtime_visible_parameter_annotations_length, CHECK); cm->set_parameter_annotations(a); } if (annotation_default_length > 0) { a = allocate_annotations(annotation_default, annotation_default_length, CHECK); cm->set_default_annotations(a); } if (runtime_visible_type_annotations_length > 0) { a = allocate_annotations(runtime_visible_type_annotations, runtime_visible_type_annotations_length, CHECK); cm->set_type_annotations(a); } } // Note: the parse_method below is big and clunky because all parsing of the code and exceptions // attribute is inlined. This is cumbersome to avoid since we inline most of the parts in the // Method* to save footprint, so we only know the size of the resulting Method* when the // entire method attribute is parsed. // // The has_localvariable_table parameter is used to pass up the value to InstanceKlass. Method* ClassFileParser::parse_method(const ClassFileStream* const cfs, bool is_interface, const ConstantPool* cp, bool* const has_localvariable_table, TRAPS) { assert(cfs != nullptr, "invariant"); assert(cp != nullptr, "invariant"); assert(has_localvariable_table != nullptr, "invariant"); ResourceMark rm(THREAD); // Parse fixed parts: // access_flags, name_index, descriptor_index, attributes_count cfs->guarantee_more(8, CHECK_NULL); int flags = cfs->get_u2_fast(); const u2 name_index = cfs->get_u2_fast(); const int cp_size = cp->length(); guarantee_property( valid_symbol_at(name_index), "Illegal constant pool index %u for method name in class file %s", name_index, CHECK_NULL); const Symbol* const name = cp->symbol_at(name_index); verify_legal_method_name(name, CHECK_NULL); const u2 signature_index = cfs->get_u2_fast(); guarantee_property( valid_symbol_at(signature_index), "Illegal constant pool index %u for method signature in class file %s", signature_index, CHECK_NULL); const Symbol* const signature = cp->symbol_at(signature_index); if (name == vmSymbols::class_initializer_name()) { // We ignore the other access flags for a valid class initializer. // (JVM Spec 2nd ed., chapter 4.6) if (_major_version < 51) { // backward compatibility flags = JVM_ACC_STATIC; } else if ((flags & JVM_ACC_STATIC) == JVM_ACC_STATIC) { flags &= JVM_ACC_STATIC | (_major_version <= JAVA_16_VERSION ? JVM_ACC_STRICT : 0); } else { classfile_parse_error("Method is not static in class file %s", THREAD); return nullptr; } } else { verify_legal_method_modifiers(flags, is_interface, name, CHECK_NULL); } if (name == vmSymbols::object_initializer_name() && is_interface) { classfile_parse_error("Interface cannot have a method named , class file %s", THREAD); return nullptr; } int args_size = -1; // only used when _need_verify is true if (_need_verify) { verify_legal_name_with_signature(name, signature, CHECK_NULL); args_size = ((flags & JVM_ACC_STATIC) ? 0 : 1) + verify_legal_method_signature(name, signature, CHECK_NULL); if (args_size > MAX_ARGS_SIZE) { classfile_parse_error("Too many arguments in method signature in class file %s", THREAD); return nullptr; } } AccessFlags access_flags(flags & JVM_RECOGNIZED_METHOD_MODIFIERS); // Default values for code and exceptions attribute elements u2 max_stack = 0; u2 max_locals = 0; u4 code_length = 0; const u1* code_start = nullptr; u2 exception_table_length = 0; const unsafe_u2* exception_table_start = nullptr; // (potentially unaligned) pointer to array of u2 elements Array* exception_handlers = Universe::the_empty_int_array(); u2 checked_exceptions_length = 0; const unsafe_u2* checked_exceptions_start = nullptr; // (potentially unaligned) pointer to array of u2 elements CompressedLineNumberWriteStream* linenumber_table = nullptr; int linenumber_table_length = 0; int total_lvt_length = 0; u2 lvt_cnt = 0; u2 lvtt_cnt = 0; bool lvt_allocated = false; u2 max_lvt_cnt = INITIAL_MAX_LVT_NUMBER; u2 max_lvtt_cnt = INITIAL_MAX_LVT_NUMBER; u2* localvariable_table_length = nullptr; const unsafe_u2** localvariable_table_start = nullptr; // (potentially unaligned) pointer to array of LVT attributes u2* localvariable_type_table_length = nullptr; const unsafe_u2** localvariable_type_table_start = nullptr; // (potentially unaligned) pointer to LVTT attributes int method_parameters_length = -1; const u1* method_parameters_data = nullptr; bool method_parameters_seen = false; bool parsed_code_attribute = false; bool parsed_checked_exceptions_attribute = false; bool parsed_stackmap_attribute = false; // stackmap attribute - JDK1.5 const u1* stackmap_data = nullptr; int stackmap_data_length = 0; u2 generic_signature_index = 0; MethodAnnotationCollector parsed_annotations; const u1* runtime_visible_annotations = nullptr; int runtime_visible_annotations_length = 0; const u1* runtime_visible_parameter_annotations = nullptr; int runtime_visible_parameter_annotations_length = 0; const u1* runtime_visible_type_annotations = nullptr; int runtime_visible_type_annotations_length = 0; bool runtime_invisible_annotations_exists = false; bool runtime_invisible_type_annotations_exists = false; bool runtime_invisible_parameter_annotations_exists = false; const u1* annotation_default = nullptr; int annotation_default_length = 0; // Parse code and exceptions attribute u2 method_attributes_count = cfs->get_u2_fast(); while (method_attributes_count--) { cfs->guarantee_more(6, CHECK_NULL); // method_attribute_name_index, method_attribute_length const u2 method_attribute_name_index = cfs->get_u2_fast(); const u4 method_attribute_length = cfs->get_u4_fast(); guarantee_property( valid_symbol_at(method_attribute_name_index), "Invalid method attribute name index %u in class file %s", method_attribute_name_index, CHECK_NULL); const Symbol* const method_attribute_name = cp->symbol_at(method_attribute_name_index); if (method_attribute_name == vmSymbols::tag_code()) { // Parse Code attribute if (_need_verify) { guarantee_property( !access_flags.is_native() && !access_flags.is_abstract(), "Code attribute in native or abstract methods in class file %s", CHECK_NULL); } if (parsed_code_attribute) { classfile_parse_error("Multiple Code attributes in class file %s", THREAD); return nullptr; } parsed_code_attribute = true; // Stack size, locals size, and code size cfs->guarantee_more(8, CHECK_NULL); max_stack = cfs->get_u2_fast(); max_locals = cfs->get_u2_fast(); code_length = cfs->get_u4_fast(); if (_need_verify) { guarantee_property(args_size <= max_locals, "Arguments can't fit into locals in class file %s", CHECK_NULL); guarantee_property(code_length > 0 && code_length <= MAX_CODE_SIZE, "Invalid method Code length %u in class file %s", code_length, CHECK_NULL); } // Code pointer code_start = cfs->current(); assert(code_start != nullptr, "null code start"); cfs->guarantee_more(code_length, CHECK_NULL); cfs->skip_u1_fast(code_length); // Exception handler table cfs->guarantee_more(2, CHECK_NULL); // exception_table_length exception_table_length = cfs->get_u2_fast(); if (exception_table_length > 0) { exception_table_start = parse_exception_table(cfs, code_length, exception_table_length, CHECK_NULL); } // Parse additional attributes in code attribute cfs->guarantee_more(2, CHECK_NULL); // code_attributes_count u2 code_attributes_count = cfs->get_u2_fast(); unsigned int calculated_attribute_length = 0; calculated_attribute_length = sizeof(max_stack) + sizeof(max_locals) + sizeof(code_length); calculated_attribute_length += checked_cast( code_length + sizeof(exception_table_length) + sizeof(code_attributes_count) + exception_table_length * ( sizeof(u2) + // start_pc sizeof(u2) + // end_pc sizeof(u2) + // handler_pc sizeof(u2) )); // catch_type_index while (code_attributes_count--) { cfs->guarantee_more(6, CHECK_NULL); // code_attribute_name_index, code_attribute_length const u2 code_attribute_name_index = cfs->get_u2_fast(); const u4 code_attribute_length = cfs->get_u4_fast(); calculated_attribute_length += code_attribute_length + (unsigned)sizeof(code_attribute_name_index) + (unsigned)sizeof(code_attribute_length); guarantee_property(valid_symbol_at(code_attribute_name_index), "Invalid code attribute name index %u in class file %s", code_attribute_name_index, CHECK_NULL); if (LoadLineNumberTables && cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_line_number_table()) { // Parse and compress line number table parse_linenumber_table(code_attribute_length, code_length, &linenumber_table, CHECK_NULL); } else if (LoadLocalVariableTables && cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_table()) { // Parse local variable table if (!lvt_allocated) { localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, INITIAL_MAX_LVT_NUMBER); localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, INITIAL_MAX_LVT_NUMBER); localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); lvt_allocated = true; } if (lvt_cnt == max_lvt_cnt) { max_lvt_cnt <<= 1; localvariable_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_table_length, lvt_cnt, max_lvt_cnt); localvariable_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_table_start, lvt_cnt, max_lvt_cnt); } localvariable_table_start[lvt_cnt] = parse_localvariable_table(cfs, code_length, max_locals, code_attribute_length, &localvariable_table_length[lvt_cnt], false, // is not LVTT CHECK_NULL); total_lvt_length += localvariable_table_length[lvt_cnt]; lvt_cnt++; } else if (LoadLocalVariableTypeTables && _major_version >= JAVA_1_5_VERSION && cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_local_variable_type_table()) { if (!lvt_allocated) { localvariable_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, INITIAL_MAX_LVT_NUMBER); localvariable_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); localvariable_type_table_length = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, u2, INITIAL_MAX_LVT_NUMBER); localvariable_type_table_start = NEW_RESOURCE_ARRAY_IN_THREAD( THREAD, const unsafe_u2*, INITIAL_MAX_LVT_NUMBER); lvt_allocated = true; } // Parse local variable type table if (lvtt_cnt == max_lvtt_cnt) { max_lvtt_cnt <<= 1; localvariable_type_table_length = REALLOC_RESOURCE_ARRAY(u2, localvariable_type_table_length, lvtt_cnt, max_lvtt_cnt); localvariable_type_table_start = REALLOC_RESOURCE_ARRAY(const unsafe_u2*, localvariable_type_table_start, lvtt_cnt, max_lvtt_cnt); } localvariable_type_table_start[lvtt_cnt] = parse_localvariable_table(cfs, code_length, max_locals, code_attribute_length, &localvariable_type_table_length[lvtt_cnt], true, // is LVTT CHECK_NULL); lvtt_cnt++; } else if (_major_version >= Verifier::STACKMAP_ATTRIBUTE_MAJOR_VERSION && cp->symbol_at(code_attribute_name_index) == vmSymbols::tag_stack_map_table()) { // Stack map is only needed by the new verifier in JDK1.5. if (parsed_stackmap_attribute) { classfile_parse_error("Multiple StackMapTable attributes in class file %s", THREAD); return nullptr; } stackmap_data = parse_stackmap_table(cfs, code_attribute_length, CHECK_NULL); stackmap_data_length = code_attribute_length; parsed_stackmap_attribute = true; } else { // Skip unknown attributes cfs->skip_u1(code_attribute_length, CHECK_NULL); } } // check method attribute length if (_need_verify) { guarantee_property(method_attribute_length == calculated_attribute_length, "Code segment has wrong length in class file %s", CHECK_NULL); } } else if (method_attribute_name == vmSymbols::tag_exceptions()) { // Parse Exceptions attribute if (parsed_checked_exceptions_attribute) { classfile_parse_error("Multiple Exceptions attributes in class file %s", THREAD); return nullptr; } parsed_checked_exceptions_attribute = true; checked_exceptions_start = parse_checked_exceptions(cfs, &checked_exceptions_length, method_attribute_length, CHECK_NULL); } else if (method_attribute_name == vmSymbols::tag_method_parameters()) { // reject multiple method parameters if (method_parameters_seen) { classfile_parse_error("Multiple MethodParameters attributes in class file %s", THREAD); return nullptr; } method_parameters_seen = true; method_parameters_length = cfs->get_u1_fast(); const u4 real_length = (method_parameters_length * 4u) + 1u; if (method_attribute_length != real_length) { classfile_parse_error( "Invalid MethodParameters method attribute length %u in class file", method_attribute_length, THREAD); return nullptr; } method_parameters_data = cfs->current(); cfs->skip_u2_fast(method_parameters_length); cfs->skip_u2_fast(method_parameters_length); // ignore this attribute if it cannot be reflected if (!vmClasses::Parameter_klass_loaded()) method_parameters_length = -1; } else if (method_attribute_name == vmSymbols::tag_synthetic()) { if (method_attribute_length != 0) { classfile_parse_error( "Invalid Synthetic method attribute length %u in class file %s", method_attribute_length, THREAD); return nullptr; } // Should we check that there hasn't already been a synthetic attribute? access_flags.set_is_synthetic(); } else if (method_attribute_name == vmSymbols::tag_deprecated()) { // 4276120 if (method_attribute_length != 0) { classfile_parse_error( "Invalid Deprecated method attribute length %u in class file %s", method_attribute_length, THREAD); return nullptr; } } else if (_major_version >= JAVA_1_5_VERSION) { if (method_attribute_name == vmSymbols::tag_signature()) { if (generic_signature_index != 0) { classfile_parse_error( "Multiple Signature attributes for method in class file %s", THREAD); return nullptr; } if (method_attribute_length != 2) { classfile_parse_error( "Invalid Signature attribute length %u in class file %s", method_attribute_length, THREAD); return nullptr; } generic_signature_index = parse_generic_signature_attribute(cfs, CHECK_NULL); } else if (method_attribute_name == vmSymbols::tag_runtime_visible_annotations()) { if (runtime_visible_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleAnnotations attributes for method in class file %s", THREAD); return nullptr; } runtime_visible_annotations_length = method_attribute_length; runtime_visible_annotations = cfs->current(); assert(runtime_visible_annotations != nullptr, "null visible annotations"); cfs->guarantee_more(runtime_visible_annotations_length, CHECK_NULL); parse_annotations(cp, runtime_visible_annotations, runtime_visible_annotations_length, &parsed_annotations, _loader_data, _can_access_vm_annotations); cfs->skip_u1_fast(runtime_visible_annotations_length); } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { if (runtime_invisible_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleAnnotations attributes for method in class file %s", THREAD); return nullptr; } runtime_invisible_annotations_exists = true; cfs->skip_u1(method_attribute_length, CHECK_NULL); } else if (method_attribute_name == vmSymbols::tag_runtime_visible_parameter_annotations()) { if (runtime_visible_parameter_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleParameterAnnotations attributes for method in class file %s", THREAD); return nullptr; } runtime_visible_parameter_annotations_length = method_attribute_length; runtime_visible_parameter_annotations = cfs->current(); assert(runtime_visible_parameter_annotations != nullptr, "null visible parameter annotations"); cfs->skip_u1(runtime_visible_parameter_annotations_length, CHECK_NULL); } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_parameter_annotations()) { if (runtime_invisible_parameter_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleParameterAnnotations attributes for method in class file %s", THREAD); return nullptr; } runtime_invisible_parameter_annotations_exists = true; cfs->skip_u1(method_attribute_length, CHECK_NULL); } else if (method_attribute_name == vmSymbols::tag_annotation_default()) { if (annotation_default != nullptr) { classfile_parse_error( "Multiple AnnotationDefault attributes for method in class file %s", THREAD); return nullptr; } annotation_default_length = method_attribute_length; annotation_default = cfs->current(); assert(annotation_default != nullptr, "null annotation default"); cfs->skip_u1(annotation_default_length, CHECK_NULL); } else if (method_attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { if (runtime_visible_type_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleTypeAnnotations attributes for method in class file %s", THREAD); return nullptr; } runtime_visible_type_annotations_length = method_attribute_length; runtime_visible_type_annotations = cfs->current(); assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); // No need for the VM to parse Type annotations cfs->skip_u1(runtime_visible_type_annotations_length, CHECK_NULL); } else if (method_attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { if (runtime_invisible_type_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleTypeAnnotations attributes for method in class file %s", THREAD); return nullptr; } runtime_invisible_type_annotations_exists = true; cfs->skip_u1(method_attribute_length, CHECK_NULL); } else { // Skip unknown attributes cfs->skip_u1(method_attribute_length, CHECK_NULL); } } else { // Skip unknown attributes cfs->skip_u1(method_attribute_length, CHECK_NULL); } } if (linenumber_table != nullptr) { linenumber_table->write_terminator(); linenumber_table_length = linenumber_table->position(); } // Make sure there's at least one Code attribute in non-native/non-abstract method if (_need_verify) { guarantee_property(access_flags.is_native() || access_flags.is_abstract() || parsed_code_attribute, "Absent Code attribute in method that is not native or abstract in class file %s", CHECK_NULL); } // All sizing information for a Method* is finally available, now create it InlineTableSizes sizes( total_lvt_length, linenumber_table_length, exception_table_length, checked_exceptions_length, method_parameters_length, generic_signature_index, runtime_visible_annotations_length, runtime_visible_parameter_annotations_length, runtime_visible_type_annotations_length, annotation_default_length, 0); Method* const m = Method::allocate(_loader_data, code_length, access_flags, &sizes, ConstMethod::NORMAL, _cp->symbol_at(name_index), CHECK_NULL); ClassLoadingService::add_class_method_size(m->size()*wordSize); // Fill in information from fixed part (access_flags already set) m->set_constants(_cp); m->set_name_index(name_index); m->set_signature_index(signature_index); m->constMethod()->compute_from_signature(cp->symbol_at(signature_index), access_flags.is_static()); assert(args_size < 0 || args_size == m->size_of_parameters(), ""); // Fill in code attribute information m->set_max_stack(max_stack); m->set_max_locals(max_locals); if (stackmap_data != nullptr) { m->constMethod()->copy_stackmap_data(_loader_data, (u1*)stackmap_data, stackmap_data_length, CHECK_NULL); } // Copy byte codes m->set_code((u1*)code_start); // Copy line number table if (linenumber_table != nullptr) { memcpy(m->compressed_linenumber_table(), linenumber_table->buffer(), linenumber_table_length); } // Copy exception table if (exception_table_length > 0) { Copy::conjoint_swap_if_needed(exception_table_start, m->exception_table_start(), exception_table_length * sizeof(ExceptionTableElement), sizeof(u2)); } // Copy method parameters if (method_parameters_length > 0) { MethodParametersElement* elem = m->constMethod()->method_parameters_start(); for (int i = 0; i < method_parameters_length; i++) { elem[i].name_cp_index = Bytes::get_Java_u2((address)method_parameters_data); method_parameters_data += 2; elem[i].flags = Bytes::get_Java_u2((address)method_parameters_data); method_parameters_data += 2; } } // Copy checked exceptions if (checked_exceptions_length > 0) { Copy::conjoint_swap_if_needed(checked_exceptions_start, m->checked_exceptions_start(), checked_exceptions_length * sizeof(CheckedExceptionElement), sizeof(u2)); } // Copy class file LVT's/LVTT's into the HotSpot internal LVT. if (total_lvt_length > 0) { *has_localvariable_table = true; copy_localvariable_table(m->constMethod(), lvt_cnt, localvariable_table_length, localvariable_table_start, lvtt_cnt, localvariable_type_table_length, localvariable_type_table_start, CHECK_NULL); } if (parsed_annotations.has_any_annotations()) parsed_annotations.apply_to(methodHandle(THREAD, m)); if (is_hidden()) { // Mark methods in hidden classes as 'hidden'. m->set_is_hidden(); } // Copy annotations copy_method_annotations(m->constMethod(), runtime_visible_annotations, runtime_visible_annotations_length, runtime_visible_parameter_annotations, runtime_visible_parameter_annotations_length, runtime_visible_type_annotations, runtime_visible_type_annotations_length, annotation_default, annotation_default_length, CHECK_NULL); if (InstanceKlass::is_finalization_enabled() && name == vmSymbols::finalize_method_name() && signature == vmSymbols::void_method_signature()) { if (m->is_empty_method()) { _has_empty_finalizer = true; } else { _has_finalizer = true; } } NOT_PRODUCT(m->verify()); return m; } // Side-effects: populates the _methods field in the parser void ClassFileParser::parse_methods(const ClassFileStream* const cfs, bool is_interface, bool* const has_localvariable_table, bool* has_final_method, bool* declares_nonstatic_concrete_methods, TRAPS) { assert(cfs != nullptr, "invariant"); assert(has_localvariable_table != nullptr, "invariant"); assert(has_final_method != nullptr, "invariant"); assert(declares_nonstatic_concrete_methods != nullptr, "invariant"); assert(nullptr == _methods, "invariant"); cfs->guarantee_more(2, CHECK); // length const u2 length = cfs->get_u2_fast(); if (length == 0) { _methods = Universe::the_empty_method_array(); } else { _methods = MetadataFactory::new_array(_loader_data, length, nullptr, CHECK); for (int index = 0; index < length; index++) { Method* method = parse_method(cfs, is_interface, _cp, has_localvariable_table, CHECK); if (method->is_final()) { *has_final_method = true; } // declares_nonstatic_concrete_methods: declares concrete instance methods, any access flags // used for interface initialization, and default method inheritance analysis if (is_interface && !(*declares_nonstatic_concrete_methods) && !method->is_abstract() && !method->is_static()) { *declares_nonstatic_concrete_methods = true; } _methods->at_put(index, method); } if (_need_verify && length > 1) { // Check duplicated methods ResourceMark rm(THREAD); // Set containing name-signature pairs NameSigHashtable* names_and_sigs = new NameSigHashtable(); for (int i = 0; i < length; i++) { const Method* const m = _methods->at(i); NameSigHash name_and_sig(m->name(), m->signature()); // If no duplicates, add name/signature in hashtable names_and_sigs. if(!names_and_sigs->put(name_and_sig, 0)) { classfile_parse_error("Duplicate method name \"%s\" with signature \"%s\" in class file %s", name_and_sig._name->as_C_string(), name_and_sig._sig->as_klass_external_name(), THREAD); return; } } } } } static const intArray* sort_methods(Array* methods) { const int length = methods->length(); // If JVMTI original method ordering or sharing is enabled we have to // remember the original class file ordering. // We temporarily use the vtable_index field in the Method* to store the // class file index, so we can read in after calling qsort. // Put the method ordering in the shared archive. if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) { for (int index = 0; index < length; index++) { Method* const m = methods->at(index); assert(!m->valid_vtable_index(), "vtable index should not be set"); m->set_vtable_index(index); } } // Sort method array by ascending method name (for faster lookups & vtable construction) // Note that the ordering is not alphabetical, see Symbol::fast_compare Method::sort_methods(methods); intArray* method_ordering = nullptr; // If JVMTI original method ordering or sharing is enabled construct int // array remembering the original ordering if (JvmtiExport::can_maintain_original_method_order() || CDSConfig::is_dumping_archive()) { method_ordering = new intArray(length, length, -1); for (int index = 0; index < length; index++) { Method* const m = methods->at(index); const int old_index = m->vtable_index(); assert(old_index >= 0 && old_index < length, "invalid method index"); method_ordering->at_put(index, old_index); m->set_vtable_index(Method::invalid_vtable_index); } } return method_ordering; } // Parse generic_signature attribute for methods and fields u2 ClassFileParser::parse_generic_signature_attribute(const ClassFileStream* const cfs, TRAPS) { assert(cfs != nullptr, "invariant"); cfs->guarantee_more(2, CHECK_0); // generic_signature_index const u2 generic_signature_index = cfs->get_u2_fast(); guarantee_property( valid_symbol_at(generic_signature_index), "Invalid Signature attribute at constant pool index %u in class file %s", generic_signature_index, CHECK_0); return generic_signature_index; } void ClassFileParser::parse_classfile_sourcefile_attribute(const ClassFileStream* const cfs, TRAPS) { assert(cfs != nullptr, "invariant"); cfs->guarantee_more(2, CHECK); // sourcefile_index const u2 sourcefile_index = cfs->get_u2_fast(); guarantee_property( valid_symbol_at(sourcefile_index), "Invalid SourceFile attribute at constant pool index %u in class file %s", sourcefile_index, CHECK); set_class_sourcefile_index(sourcefile_index); } void ClassFileParser::parse_classfile_source_debug_extension_attribute(const ClassFileStream* const cfs, int length, TRAPS) { assert(cfs != nullptr, "invariant"); const u1* const sde_buffer = cfs->current(); assert(sde_buffer != nullptr, "null sde buffer"); // Don't bother storing it if there is no way to retrieve it if (JvmtiExport::can_get_source_debug_extension()) { assert((length+1) > length, "Overflow checking"); u1* const sde = NEW_RESOURCE_ARRAY_IN_THREAD(THREAD, u1, length+1); for (int i = 0; i < length; i++) { sde[i] = sde_buffer[i]; } sde[length] = '\0'; set_class_sde_buffer((const char*)sde, length); } // Got utf8 string, set stream position forward cfs->skip_u1(length, CHECK); } // Inner classes can be static, private or protected (classic VM does this) #define RECOGNIZED_INNER_CLASS_MODIFIERS ( JVM_RECOGNIZED_CLASS_MODIFIERS | \ JVM_ACC_PRIVATE | \ JVM_ACC_PROTECTED | \ JVM_ACC_STATIC \ ) // Find index of the InnerClasses entry for the specified inner_class_info_index. // Return -1 if none is found. static int inner_classes_find_index(const Array* inner_classes, int inner, const ConstantPool* cp, int length) { Symbol* cp_klass_name = cp->klass_name_at(inner); for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { int idx_inner = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); if (cp->klass_name_at(idx_inner) == cp_klass_name) { return idx; } } return -1; } // Return the outer_class_info_index for the InnerClasses entry containing the // specified inner_class_info_index. Return -1 if no InnerClasses entry is found. static int inner_classes_jump_to_outer(const Array* inner_classes, int inner, const ConstantPool* cp, int length) { if (inner == 0) return -1; int idx = inner_classes_find_index(inner_classes, inner, cp, length); if (idx == -1) return -1; int result = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); return result; } // Return true if circularity is found, false if no circularity is found. // Use Floyd's cycle finding algorithm. static bool inner_classes_check_loop_through_outer(const Array* inner_classes, int idx, const ConstantPool* cp, int length) { int slow = inner_classes->at(idx + InstanceKlass::inner_class_inner_class_info_offset); int fast = inner_classes->at(idx + InstanceKlass::inner_class_outer_class_info_offset); while (fast != -1 && fast != 0) { if (slow != 0 && (cp->klass_name_at(slow) == cp->klass_name_at(fast))) { return true; // found a circularity } fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); if (fast == -1) return false; fast = inner_classes_jump_to_outer(inner_classes, fast, cp, length); if (fast == -1) return false; slow = inner_classes_jump_to_outer(inner_classes, slow, cp, length); assert(slow != -1, "sanity check"); } return false; } // Loop through each InnerClasses entry checking for circularities and duplications // with other entries. If duplicate entries are found then throw CFE. Otherwise, // return true if a circularity or entries with duplicate inner_class_info_indexes // are found. bool ClassFileParser::check_inner_classes_circularity(const ConstantPool* cp, int length, TRAPS) { // Loop through each InnerClasses entry. for (int idx = 0; idx < length; idx += InstanceKlass::inner_class_next_offset) { // Return true if there are circular entries. if (inner_classes_check_loop_through_outer(_inner_classes, idx, cp, length)) { return true; } // Check if there are duplicate entries or entries with the same inner_class_info_index. for (int y = idx + InstanceKlass::inner_class_next_offset; y < length; y += InstanceKlass::inner_class_next_offset) { // 4347400: make sure there's no duplicate entry in the classes array if (_major_version >= JAVA_1_5_VERSION) { guarantee_property((_inner_classes->at(idx) != _inner_classes->at(y) || _inner_classes->at(idx+1) != _inner_classes->at(y+1) || _inner_classes->at(idx+2) != _inner_classes->at(y+2) || _inner_classes->at(idx+3) != _inner_classes->at(y+3)), "Duplicate entry in InnerClasses attribute in class file %s", CHECK_(true)); } // Return true if there are two entries with the same inner_class_info_index. if (_inner_classes->at(y) == _inner_classes->at(idx)) { return true; } } } return false; } // Return number of classes in the inner classes attribute table u2 ClassFileParser::parse_classfile_inner_classes_attribute(const ClassFileStream* const cfs, const ConstantPool* cp, const u1* const inner_classes_attribute_start, bool parsed_enclosingmethod_attribute, u2 enclosing_method_class_index, u2 enclosing_method_method_index, TRAPS) { const u1* const current_mark = cfs->current(); u2 length = 0; if (inner_classes_attribute_start != nullptr) { cfs->set_current(inner_classes_attribute_start); cfs->guarantee_more(2, CHECK_0); // length length = cfs->get_u2_fast(); } // 4-tuples of shorts of inner classes data and 2 shorts of enclosing // method data: // [inner_class_info_index, // outer_class_info_index, // inner_name_index, // inner_class_access_flags, // ... // enclosing_method_class_index, // enclosing_method_method_index] const int size = length * 4 + (parsed_enclosingmethod_attribute ? 2 : 0); Array* inner_classes = MetadataFactory::new_array(_loader_data, size, CHECK_0); _inner_classes = inner_classes; int index = 0; cfs->guarantee_more(8 * length, CHECK_0); // 4-tuples of u2 for (int n = 0; n < length; n++) { // Inner class index const u2 inner_class_info_index = cfs->get_u2_fast(); guarantee_property( valid_klass_reference_at(inner_class_info_index), "inner_class_info_index %u has bad constant type in class file %s", inner_class_info_index, CHECK_0); // Outer class index const u2 outer_class_info_index = cfs->get_u2_fast(); guarantee_property( outer_class_info_index == 0 || valid_klass_reference_at(outer_class_info_index), "outer_class_info_index %u has bad constant type in class file %s", outer_class_info_index, CHECK_0); if (outer_class_info_index != 0) { const Symbol* const outer_class_name = cp->klass_name_at(outer_class_info_index); char* bytes = (char*)outer_class_name->bytes(); guarantee_property(bytes[0] != JVM_SIGNATURE_ARRAY, "Outer class is an array class in class file %s", CHECK_0); } // Inner class name const u2 inner_name_index = cfs->get_u2_fast(); guarantee_property( inner_name_index == 0 || valid_symbol_at(inner_name_index), "inner_name_index %u has bad constant type in class file %s", inner_name_index, CHECK_0); if (_need_verify) { guarantee_property(inner_class_info_index != outer_class_info_index, "Class is both outer and inner class in class file %s", CHECK_0); } // Access flags jint flags; // JVM_ACC_MODULE is defined in JDK-9 and later. if (_major_version >= JAVA_9_VERSION) { flags = cfs->get_u2_fast() & (RECOGNIZED_INNER_CLASS_MODIFIERS | JVM_ACC_MODULE); } else { flags = cfs->get_u2_fast() & RECOGNIZED_INNER_CLASS_MODIFIERS; } if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { // Set abstract bit for old class files for backward compatibility flags |= JVM_ACC_ABSTRACT; } verify_legal_class_modifiers(flags, CHECK_0); AccessFlags inner_access_flags(flags); inner_classes->at_put(index++, inner_class_info_index); inner_classes->at_put(index++, outer_class_info_index); inner_classes->at_put(index++, inner_name_index); inner_classes->at_put(index++, inner_access_flags.as_short()); } // Check for circular and duplicate entries. bool has_circularity = false; if (_need_verify) { has_circularity = check_inner_classes_circularity(cp, length * 4, CHECK_0); if (has_circularity) { // If circularity check failed then ignore InnerClasses attribute. MetadataFactory::free_array(_loader_data, _inner_classes); index = 0; if (parsed_enclosingmethod_attribute) { inner_classes = MetadataFactory::new_array(_loader_data, 2, CHECK_0); _inner_classes = inner_classes; } else { _inner_classes = Universe::the_empty_short_array(); } } } // Set EnclosingMethod class and method indexes. if (parsed_enclosingmethod_attribute) { inner_classes->at_put(index++, enclosing_method_class_index); inner_classes->at_put(index++, enclosing_method_method_index); } assert(index == size || has_circularity, "wrong size"); // Restore buffer's current position. cfs->set_current(current_mark); return length; } u2 ClassFileParser::parse_classfile_nest_members_attribute(const ClassFileStream* const cfs, const u1* const nest_members_attribute_start, TRAPS) { const u1* const current_mark = cfs->current(); u2 length = 0; if (nest_members_attribute_start != nullptr) { cfs->set_current(nest_members_attribute_start); cfs->guarantee_more(2, CHECK_0); // length length = cfs->get_u2_fast(); } const int size = length; Array* const nest_members = MetadataFactory::new_array(_loader_data, size, CHECK_0); _nest_members = nest_members; int index = 0; cfs->guarantee_more(2 * length, CHECK_0); for (int n = 0; n < length; n++) { const u2 class_info_index = cfs->get_u2_fast(); guarantee_property( valid_klass_reference_at(class_info_index), "Nest member class_info_index %u has bad constant type in class file %s", class_info_index, CHECK_0); nest_members->at_put(index++, class_info_index); } assert(index == size, "wrong size"); // Restore buffer's current position. cfs->set_current(current_mark); return length; } u2 ClassFileParser::parse_classfile_permitted_subclasses_attribute(const ClassFileStream* const cfs, const u1* const permitted_subclasses_attribute_start, TRAPS) { const u1* const current_mark = cfs->current(); u2 length = 0; if (permitted_subclasses_attribute_start != nullptr) { cfs->set_current(permitted_subclasses_attribute_start); cfs->guarantee_more(2, CHECK_0); // length length = cfs->get_u2_fast(); } const int size = length; Array* const permitted_subclasses = MetadataFactory::new_array(_loader_data, size, CHECK_0); _permitted_subclasses = permitted_subclasses; if (length > 0) { int index = 0; cfs->guarantee_more(2 * length, CHECK_0); for (int n = 0; n < length; n++) { const u2 class_info_index = cfs->get_u2_fast(); guarantee_property( valid_klass_reference_at(class_info_index), "Permitted subclass class_info_index %u has bad constant type in class file %s", class_info_index, CHECK_0); permitted_subclasses->at_put(index++, class_info_index); } assert(index == size, "wrong size"); } // Restore buffer's current position. cfs->set_current(current_mark); return length; } // Record { // u2 attribute_name_index; // u4 attribute_length; // u2 components_count; // component_info components[components_count]; // } // component_info { // u2 name_index; // u2 descriptor_index // u2 attributes_count; // attribute_info_attributes[attributes_count]; // } u4 ClassFileParser::parse_classfile_record_attribute(const ClassFileStream* const cfs, const ConstantPool* cp, const u1* const record_attribute_start, TRAPS) { const u1* const current_mark = cfs->current(); int components_count = 0; unsigned int calculate_attr_size = 0; if (record_attribute_start != nullptr) { cfs->set_current(record_attribute_start); cfs->guarantee_more(2, CHECK_0); // num of components components_count = (int)cfs->get_u2_fast(); calculate_attr_size = 2; } Array* const record_components = MetadataFactory::new_array(_loader_data, components_count, nullptr, CHECK_0); _record_components = record_components; for (int x = 0; x < components_count; x++) { cfs->guarantee_more(6, CHECK_0); // name_index, descriptor_index, attributes_count const u2 name_index = cfs->get_u2_fast(); guarantee_property(valid_symbol_at(name_index), "Invalid constant pool index %u for name in Record attribute in class file %s", name_index, CHECK_0); const Symbol* const name = cp->symbol_at(name_index); verify_legal_field_name(name, CHECK_0); const u2 descriptor_index = cfs->get_u2_fast(); guarantee_property(valid_symbol_at(descriptor_index), "Invalid constant pool index %u for descriptor in Record attribute in class file %s", descriptor_index, CHECK_0); const Symbol* const descr = cp->symbol_at(descriptor_index); verify_legal_field_signature(name, descr, CHECK_0); const u2 attributes_count = cfs->get_u2_fast(); calculate_attr_size += 6; u2 generic_sig_index = 0; const u1* runtime_visible_annotations = nullptr; int runtime_visible_annotations_length = 0; bool runtime_invisible_annotations_exists = false; const u1* runtime_visible_type_annotations = nullptr; int runtime_visible_type_annotations_length = 0; bool runtime_invisible_type_annotations_exists = false; // Expected attributes for record components are Signature, Runtime(In)VisibleAnnotations, // and Runtime(In)VisibleTypeAnnotations. Other attributes are ignored. for (int y = 0; y < attributes_count; y++) { cfs->guarantee_more(6, CHECK_0); // attribute_name_index, attribute_length const u2 attribute_name_index = cfs->get_u2_fast(); const u4 attribute_length = cfs->get_u4_fast(); calculate_attr_size += 6; guarantee_property( valid_symbol_at(attribute_name_index), "Invalid Record attribute name index %u in class file %s", attribute_name_index, CHECK_0); const Symbol* const attribute_name = cp->symbol_at(attribute_name_index); if (attribute_name == vmSymbols::tag_signature()) { if (generic_sig_index != 0) { classfile_parse_error( "Multiple Signature attributes for Record component in class file %s", THREAD); return 0; } if (attribute_length != 2) { classfile_parse_error( "Invalid Signature attribute length %u in Record component in class file %s", attribute_length, THREAD); return 0; } generic_sig_index = parse_generic_signature_attribute(cfs, CHECK_0); } else if (attribute_name == vmSymbols::tag_runtime_visible_annotations()) { if (runtime_visible_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleAnnotations attributes for Record component in class file %s", THREAD); return 0; } runtime_visible_annotations_length = attribute_length; runtime_visible_annotations = cfs->current(); assert(runtime_visible_annotations != nullptr, "null record component visible annotation"); cfs->guarantee_more(runtime_visible_annotations_length, CHECK_0); cfs->skip_u1_fast(runtime_visible_annotations_length); } else if (attribute_name == vmSymbols::tag_runtime_invisible_annotations()) { if (runtime_invisible_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleAnnotations attributes for Record component in class file %s", THREAD); return 0; } runtime_invisible_annotations_exists = true; cfs->skip_u1(attribute_length, CHECK_0); } else if (attribute_name == vmSymbols::tag_runtime_visible_type_annotations()) { if (runtime_visible_type_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleTypeAnnotations attributes for Record component in class file %s", THREAD); return 0; } runtime_visible_type_annotations_length = attribute_length; runtime_visible_type_annotations = cfs->current(); assert(runtime_visible_type_annotations != nullptr, "null record component visible type annotation"); cfs->guarantee_more(runtime_visible_type_annotations_length, CHECK_0); cfs->skip_u1_fast(runtime_visible_type_annotations_length); } else if (attribute_name == vmSymbols::tag_runtime_invisible_type_annotations()) { if (runtime_invisible_type_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleTypeAnnotations attributes for Record component in class file %s", THREAD); return 0; } runtime_invisible_type_annotations_exists = true; cfs->skip_u1(attribute_length, CHECK_0); } else { // Skip unknown attributes cfs->skip_u1(attribute_length, CHECK_0); } calculate_attr_size += attribute_length; } // End of attributes For loop AnnotationArray* annotations = allocate_annotations(runtime_visible_annotations, runtime_visible_annotations_length, CHECK_0); AnnotationArray* type_annotations = allocate_annotations(runtime_visible_type_annotations, runtime_visible_type_annotations_length, CHECK_0); RecordComponent* record_component = RecordComponent::allocate(_loader_data, name_index, descriptor_index, generic_sig_index, annotations, type_annotations, CHECK_0); record_components->at_put(x, record_component); } // End of component processing loop // Restore buffer's current position. cfs->set_current(current_mark); return calculate_attr_size; } void ClassFileParser::parse_classfile_synthetic_attribute() { set_class_synthetic_flag(true); } void ClassFileParser::parse_classfile_signature_attribute(const ClassFileStream* const cfs, TRAPS) { assert(cfs != nullptr, "invariant"); const u2 signature_index = cfs->get_u2(CHECK); guarantee_property( valid_symbol_at(signature_index), "Invalid constant pool index %u in Signature attribute in class file %s", signature_index, CHECK); set_class_generic_signature_index(signature_index); } void ClassFileParser::parse_classfile_bootstrap_methods_attribute(const ClassFileStream* const cfs, ConstantPool* cp, u4 attribute_byte_length, TRAPS) { assert(cfs != nullptr, "invariant"); assert(cp != nullptr, "invariant"); const u1* const current_start = cfs->current(); guarantee_property(attribute_byte_length >= sizeof(u2), "Invalid BootstrapMethods attribute length %u in class file %s", attribute_byte_length, CHECK); cfs->guarantee_more(attribute_byte_length, CHECK); const int attribute_array_length = cfs->get_u2_fast(); guarantee_property(_max_bootstrap_specifier_index < attribute_array_length, "Short length on BootstrapMethods in class file %s", CHECK); // The attribute contains a counted array of counted tuples of shorts, // represending bootstrap specifiers: // length*{bootstrap_method_index, argument_count*{argument_index}} const unsigned int operand_count = (attribute_byte_length - (unsigned)sizeof(u2)) / (unsigned)sizeof(u2); // operand_count = number of shorts in attr, except for leading length // The attribute is copied into a short[] array. // The array begins with a series of short[2] pairs, one for each tuple. const int index_size = (attribute_array_length * 2); Array* const operands = MetadataFactory::new_array(_loader_data, index_size + operand_count, CHECK); // Eagerly assign operands so they will be deallocated with the constant // pool if there is an error. cp->set_operands(operands); int operand_fill_index = index_size; const int cp_size = cp->length(); for (int n = 0; n < attribute_array_length; n++) { // Store a 32-bit offset into the header of the operand array. ConstantPool::operand_offset_at_put(operands, n, operand_fill_index); // Read a bootstrap specifier. cfs->guarantee_more(sizeof(u2) * 2, CHECK); // bsm, argc const u2 bootstrap_method_index = cfs->get_u2_fast(); const u2 argument_count = cfs->get_u2_fast(); guarantee_property( valid_cp_range(bootstrap_method_index, cp_size) && cp->tag_at(bootstrap_method_index).is_method_handle(), "bootstrap_method_index %u has bad constant type in class file %s", bootstrap_method_index, CHECK); guarantee_property((operand_fill_index + 1 + argument_count) < operands->length(), "Invalid BootstrapMethods num_bootstrap_methods or num_bootstrap_arguments value in class file %s", CHECK); operands->at_put(operand_fill_index++, bootstrap_method_index); operands->at_put(operand_fill_index++, argument_count); cfs->guarantee_more(sizeof(u2) * argument_count, CHECK); // argv[argc] for (int j = 0; j < argument_count; j++) { const u2 argument_index = cfs->get_u2_fast(); guarantee_property( valid_cp_range(argument_index, cp_size) && cp->tag_at(argument_index).is_loadable_constant(), "argument_index %u has bad constant type in class file %s", argument_index, CHECK); operands->at_put(operand_fill_index++, argument_index); } } guarantee_property(current_start + attribute_byte_length == cfs->current(), "Bad length on BootstrapMethods in class file %s", CHECK); } void ClassFileParser::parse_classfile_attributes(const ClassFileStream* const cfs, ConstantPool* cp, ClassFileParser::ClassAnnotationCollector* parsed_annotations, TRAPS) { assert(cfs != nullptr, "invariant"); assert(cp != nullptr, "invariant"); assert(parsed_annotations != nullptr, "invariant"); // Set inner classes attribute to default sentinel _inner_classes = Universe::the_empty_short_array(); // Set nest members attribute to default sentinel _nest_members = Universe::the_empty_short_array(); // Set _permitted_subclasses attribute to default sentinel _permitted_subclasses = Universe::the_empty_short_array(); cfs->guarantee_more(2, CHECK); // attributes_count u2 attributes_count = cfs->get_u2_fast(); bool parsed_sourcefile_attribute = false; bool parsed_innerclasses_attribute = false; bool parsed_nest_members_attribute = false; bool parsed_permitted_subclasses_attribute = false; bool parsed_nest_host_attribute = false; bool parsed_record_attribute = false; bool parsed_enclosingmethod_attribute = false; bool parsed_bootstrap_methods_attribute = false; const u1* runtime_visible_annotations = nullptr; int runtime_visible_annotations_length = 0; const u1* runtime_visible_type_annotations = nullptr; int runtime_visible_type_annotations_length = 0; bool runtime_invisible_type_annotations_exists = false; bool runtime_invisible_annotations_exists = false; bool parsed_source_debug_ext_annotations_exist = false; const u1* inner_classes_attribute_start = nullptr; u4 inner_classes_attribute_length = 0; u2 enclosing_method_class_index = 0; u2 enclosing_method_method_index = 0; const u1* nest_members_attribute_start = nullptr; u4 nest_members_attribute_length = 0; const u1* record_attribute_start = nullptr; u4 record_attribute_length = 0; const u1* permitted_subclasses_attribute_start = nullptr; u4 permitted_subclasses_attribute_length = 0; // Iterate over attributes while (attributes_count--) { cfs->guarantee_more(6, CHECK); // attribute_name_index, attribute_length const u2 attribute_name_index = cfs->get_u2_fast(); const u4 attribute_length = cfs->get_u4_fast(); guarantee_property( valid_symbol_at(attribute_name_index), "Attribute name has bad constant pool index %u in class file %s", attribute_name_index, CHECK); const Symbol* const tag = cp->symbol_at(attribute_name_index); if (tag == vmSymbols::tag_source_file()) { // Check for SourceFile tag if (_need_verify) { guarantee_property(attribute_length == 2, "Wrong SourceFile attribute length in class file %s", CHECK); } if (parsed_sourcefile_attribute) { classfile_parse_error("Multiple SourceFile attributes in class file %s", THREAD); return; } else { parsed_sourcefile_attribute = true; } parse_classfile_sourcefile_attribute(cfs, CHECK); } else if (tag == vmSymbols::tag_source_debug_extension()) { // Check for SourceDebugExtension tag if (parsed_source_debug_ext_annotations_exist) { classfile_parse_error( "Multiple SourceDebugExtension attributes in class file %s", THREAD); return; } parsed_source_debug_ext_annotations_exist = true; parse_classfile_source_debug_extension_attribute(cfs, (int)attribute_length, CHECK); } else if (tag == vmSymbols::tag_inner_classes()) { // Check for InnerClasses tag if (parsed_innerclasses_attribute) { classfile_parse_error("Multiple InnerClasses attributes in class file %s", THREAD); return; } else { parsed_innerclasses_attribute = true; } inner_classes_attribute_start = cfs->current(); inner_classes_attribute_length = attribute_length; cfs->skip_u1(inner_classes_attribute_length, CHECK); } else if (tag == vmSymbols::tag_synthetic()) { // Check for Synthetic tag // Shouldn't we check that the synthetic flags wasn't already set? - not required in spec if (attribute_length != 0) { classfile_parse_error( "Invalid Synthetic classfile attribute length %u in class file %s", attribute_length, THREAD); return; } parse_classfile_synthetic_attribute(); } else if (tag == vmSymbols::tag_deprecated()) { // Check for Deprecated tag - 4276120 if (attribute_length != 0) { classfile_parse_error( "Invalid Deprecated classfile attribute length %u in class file %s", attribute_length, THREAD); return; } } else if (_major_version >= JAVA_1_5_VERSION) { if (tag == vmSymbols::tag_signature()) { if (_generic_signature_index != 0) { classfile_parse_error( "Multiple Signature attributes in class file %s", THREAD); return; } if (attribute_length != 2) { classfile_parse_error( "Wrong Signature attribute length %u in class file %s", attribute_length, THREAD); return; } parse_classfile_signature_attribute(cfs, CHECK); } else if (tag == vmSymbols::tag_runtime_visible_annotations()) { if (runtime_visible_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleAnnotations attributes in class file %s", THREAD); return; } runtime_visible_annotations_length = attribute_length; runtime_visible_annotations = cfs->current(); assert(runtime_visible_annotations != nullptr, "null visible annotations"); cfs->guarantee_more(runtime_visible_annotations_length, CHECK); parse_annotations(cp, runtime_visible_annotations, runtime_visible_annotations_length, parsed_annotations, _loader_data, _can_access_vm_annotations); cfs->skip_u1_fast(runtime_visible_annotations_length); } else if (tag == vmSymbols::tag_runtime_invisible_annotations()) { if (runtime_invisible_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleAnnotations attributes in class file %s", THREAD); return; } runtime_invisible_annotations_exists = true; cfs->skip_u1(attribute_length, CHECK); } else if (tag == vmSymbols::tag_enclosing_method()) { if (parsed_enclosingmethod_attribute) { classfile_parse_error("Multiple EnclosingMethod attributes in class file %s", THREAD); return; } else { parsed_enclosingmethod_attribute = true; } guarantee_property(attribute_length == 4, "Wrong EnclosingMethod attribute length %u in class file %s", attribute_length, CHECK); cfs->guarantee_more(4, CHECK); // class_index, method_index enclosing_method_class_index = cfs->get_u2_fast(); enclosing_method_method_index = cfs->get_u2_fast(); if (enclosing_method_class_index == 0) { classfile_parse_error("Invalid class index in EnclosingMethod attribute in class file %s", THREAD); return; } // Validate the constant pool indices and types guarantee_property(valid_klass_reference_at(enclosing_method_class_index), "Invalid or out-of-bounds class index in EnclosingMethod attribute in class file %s", CHECK); if (enclosing_method_method_index != 0 && (!cp->is_within_bounds(enclosing_method_method_index) || !cp->tag_at(enclosing_method_method_index).is_name_and_type())) { classfile_parse_error("Invalid or out-of-bounds method index in EnclosingMethod attribute in class file %s", THREAD); return; } } else if (tag == vmSymbols::tag_bootstrap_methods() && _major_version >= Verifier::INVOKEDYNAMIC_MAJOR_VERSION) { if (parsed_bootstrap_methods_attribute) { classfile_parse_error("Multiple BootstrapMethods attributes in class file %s", THREAD); return; } parsed_bootstrap_methods_attribute = true; parse_classfile_bootstrap_methods_attribute(cfs, cp, attribute_length, CHECK); } else if (tag == vmSymbols::tag_runtime_visible_type_annotations()) { if (runtime_visible_type_annotations != nullptr) { classfile_parse_error( "Multiple RuntimeVisibleTypeAnnotations attributes in class file %s", THREAD); return; } runtime_visible_type_annotations_length = attribute_length; runtime_visible_type_annotations = cfs->current(); assert(runtime_visible_type_annotations != nullptr, "null visible type annotations"); // No need for the VM to parse Type annotations cfs->skip_u1(runtime_visible_type_annotations_length, CHECK); } else if (tag == vmSymbols::tag_runtime_invisible_type_annotations()) { if (runtime_invisible_type_annotations_exists) { classfile_parse_error( "Multiple RuntimeInvisibleTypeAnnotations attributes in class file %s", THREAD); return; } runtime_invisible_type_annotations_exists = true; cfs->skip_u1(attribute_length, CHECK); } else if (_major_version >= JAVA_11_VERSION) { if (tag == vmSymbols::tag_nest_members()) { // Check for NestMembers tag if (parsed_nest_members_attribute) { classfile_parse_error("Multiple NestMembers attributes in class file %s", THREAD); return; } else { parsed_nest_members_attribute = true; } if (parsed_nest_host_attribute) { classfile_parse_error("Conflicting NestHost and NestMembers attributes in class file %s", THREAD); return; } nest_members_attribute_start = cfs->current(); nest_members_attribute_length = attribute_length; cfs->skip_u1(nest_members_attribute_length, CHECK); } else if (tag == vmSymbols::tag_nest_host()) { if (parsed_nest_host_attribute) { classfile_parse_error("Multiple NestHost attributes in class file %s", THREAD); return; } else { parsed_nest_host_attribute = true; } if (parsed_nest_members_attribute) { classfile_parse_error("Conflicting NestMembers and NestHost attributes in class file %s", THREAD); return; } if (_need_verify) { guarantee_property(attribute_length == 2, "Wrong NestHost attribute length in class file %s", CHECK); } cfs->guarantee_more(2, CHECK); u2 class_info_index = cfs->get_u2_fast(); guarantee_property( valid_klass_reference_at(class_info_index), "Nest-host class_info_index %u has bad constant type in class file %s", class_info_index, CHECK); _nest_host = class_info_index; } else if (_major_version >= JAVA_16_VERSION) { if (tag == vmSymbols::tag_record()) { if (parsed_record_attribute) { classfile_parse_error("Multiple Record attributes in class file %s", THREAD); return; } parsed_record_attribute = true; record_attribute_start = cfs->current(); record_attribute_length = attribute_length; } else if (_major_version >= JAVA_17_VERSION) { if (tag == vmSymbols::tag_permitted_subclasses()) { if (parsed_permitted_subclasses_attribute) { classfile_parse_error("Multiple PermittedSubclasses attributes in class file %s", CHECK); return; } // Classes marked ACC_FINAL cannot have a PermittedSubclasses attribute. if (_access_flags.is_final()) { classfile_parse_error("PermittedSubclasses attribute in final class file %s", CHECK); return; } parsed_permitted_subclasses_attribute = true; permitted_subclasses_attribute_start = cfs->current(); permitted_subclasses_attribute_length = attribute_length; } } // Skip attribute_length for any attribute where major_verson >= JAVA_17_VERSION cfs->skip_u1(attribute_length, CHECK); } else { // Unknown attribute cfs->skip_u1(attribute_length, CHECK); } } else { // Unknown attribute cfs->skip_u1(attribute_length, CHECK); } } else { // Unknown attribute cfs->skip_u1(attribute_length, CHECK); } } _class_annotations = allocate_annotations(runtime_visible_annotations, runtime_visible_annotations_length, CHECK); _class_type_annotations = allocate_annotations(runtime_visible_type_annotations, runtime_visible_type_annotations_length, CHECK); if (parsed_innerclasses_attribute || parsed_enclosingmethod_attribute) { const u2 num_of_classes = parse_classfile_inner_classes_attribute( cfs, cp, inner_classes_attribute_start, parsed_innerclasses_attribute, enclosing_method_class_index, enclosing_method_method_index, CHECK); if (parsed_innerclasses_attribute && _need_verify && _major_version >= JAVA_1_5_VERSION) { guarantee_property( inner_classes_attribute_length == sizeof(num_of_classes) + 4 * sizeof(u2) * num_of_classes, "Wrong InnerClasses attribute length in class file %s", CHECK); } } if (parsed_nest_members_attribute) { const u2 num_of_classes = parse_classfile_nest_members_attribute( cfs, nest_members_attribute_start, CHECK); if (_need_verify) { guarantee_property( nest_members_attribute_length == sizeof(num_of_classes) + sizeof(u2) * num_of_classes, "Wrong NestMembers attribute length in class file %s", CHECK); } } if (parsed_record_attribute) { const unsigned int calculated_attr_length = parse_classfile_record_attribute( cfs, cp, record_attribute_start, CHECK); if (_need_verify) { guarantee_property(record_attribute_length == calculated_attr_length, "Record attribute has wrong length in class file %s", CHECK); } } if (parsed_permitted_subclasses_attribute) { const u2 num_subclasses = parse_classfile_permitted_subclasses_attribute( cfs, permitted_subclasses_attribute_start, CHECK); if (_need_verify) { guarantee_property( permitted_subclasses_attribute_length == sizeof(num_subclasses) + sizeof(u2) * num_subclasses, "Wrong PermittedSubclasses attribute length in class file %s", CHECK); } } if (_max_bootstrap_specifier_index >= 0) { guarantee_property(parsed_bootstrap_methods_attribute, "Missing BootstrapMethods attribute in class file %s", CHECK); } } void ClassFileParser::apply_parsed_class_attributes(InstanceKlass* k) { assert(k != nullptr, "invariant"); if (_synthetic_flag) k->set_is_synthetic(); if (_sourcefile_index != 0) { k->set_source_file_name_index(_sourcefile_index); } if (_generic_signature_index != 0) { k->set_generic_signature_index(_generic_signature_index); } if (_sde_buffer != nullptr) { k->set_source_debug_extension(_sde_buffer, _sde_length); } } // Create the Annotations object that will // hold the annotations array for the Klass. void ClassFileParser::create_combined_annotations(TRAPS) { if (_class_annotations == nullptr && _class_type_annotations == nullptr && _fields_annotations == nullptr && _fields_type_annotations == nullptr) { // Don't create the Annotations object unnecessarily. return; } Annotations* const annotations = Annotations::allocate(_loader_data, CHECK); annotations->set_class_annotations(_class_annotations); annotations->set_class_type_annotations(_class_type_annotations); annotations->set_fields_annotations(_fields_annotations); annotations->set_fields_type_annotations(_fields_type_annotations); // This is the Annotations object that will be // assigned to InstanceKlass being constructed. _combined_annotations = annotations; // The annotations arrays below has been transferred the // _combined_annotations so these fields can now be cleared. _class_annotations = nullptr; _class_type_annotations = nullptr; _fields_annotations = nullptr; _fields_type_annotations = nullptr; } // Transfer ownership of metadata allocated to the InstanceKlass. void ClassFileParser::apply_parsed_class_metadata( InstanceKlass* this_klass, int java_fields_count) { assert(this_klass != nullptr, "invariant"); _cp->set_pool_holder(this_klass); this_klass->set_constants(_cp); this_klass->set_fieldinfo_stream(_fieldinfo_stream); this_klass->set_fields_status(_fields_status); this_klass->set_methods(_methods); this_klass->set_inner_classes(_inner_classes); this_klass->set_nest_members(_nest_members); this_klass->set_nest_host_index(_nest_host); this_klass->set_annotations(_combined_annotations); this_klass->set_permitted_subclasses(_permitted_subclasses); this_klass->set_record_components(_record_components); // Delay the setting of _local_interfaces and _transitive_interfaces until after // initialize_supers() in fill_instance_klass(). It is because the _local_interfaces could // be shared with _transitive_interfaces and _transitive_interfaces may be shared with // its _super. If an OOM occurs while loading the current klass, its _super field // may not have been set. When GC tries to free the klass, the _transitive_interfaces // may be deallocated mistakenly in InstanceKlass::deallocate_interfaces(). Subsequent // dereferences to the deallocated _transitive_interfaces will result in a crash. // Clear out these fields so they don't get deallocated by the destructor clear_class_metadata(); } AnnotationArray* ClassFileParser::allocate_annotations(const u1* const anno, int anno_length, TRAPS) { AnnotationArray* annotations = nullptr; if (anno != nullptr) { annotations = MetadataFactory::new_array(_loader_data, anno_length, CHECK_(annotations)); for (int i = 0; i < anno_length; i++) { annotations->at_put(i, anno[i]); } } return annotations; } const InstanceKlass* ClassFileParser::parse_super_class(ConstantPool* const cp, const int super_class_index, const bool need_verify, TRAPS) { assert(cp != nullptr, "invariant"); const InstanceKlass* super_klass = nullptr; if (super_class_index == 0) { guarantee_property(_class_name == vmSymbols::java_lang_Object(), "Invalid superclass index %u in class file %s", super_class_index, CHECK_NULL); } else { guarantee_property(valid_klass_reference_at(super_class_index), "Invalid superclass index %u in class file %s", super_class_index, CHECK_NULL); // The class name should be legal because it is checked when parsing constant pool. // However, make sure it is not an array type. bool is_array = false; if (cp->tag_at(super_class_index).is_klass()) { super_klass = InstanceKlass::cast(cp->resolved_klass_at(super_class_index)); if (need_verify) is_array = super_klass->is_array_klass(); } else if (need_verify) { is_array = (cp->klass_name_at(super_class_index)->char_at(0) == JVM_SIGNATURE_ARRAY); } if (need_verify) { guarantee_property(!is_array, "Bad superclass name in class file %s", CHECK_NULL); } } return super_klass; } OopMapBlocksBuilder::OopMapBlocksBuilder(unsigned int max_blocks) { _max_nonstatic_oop_maps = max_blocks; _nonstatic_oop_map_count = 0; if (max_blocks == 0) { _nonstatic_oop_maps = nullptr; } else { _nonstatic_oop_maps = NEW_RESOURCE_ARRAY(OopMapBlock, _max_nonstatic_oop_maps); memset(_nonstatic_oop_maps, 0, sizeof(OopMapBlock) * max_blocks); } } OopMapBlock* OopMapBlocksBuilder::last_oop_map() const { assert(_nonstatic_oop_map_count > 0, "Has no oop maps"); return _nonstatic_oop_maps + (_nonstatic_oop_map_count - 1); } // addition of super oop maps void OopMapBlocksBuilder::initialize_inherited_blocks(OopMapBlock* blocks, unsigned int nof_blocks) { assert(nof_blocks && _nonstatic_oop_map_count == 0 && nof_blocks <= _max_nonstatic_oop_maps, "invariant"); memcpy(_nonstatic_oop_maps, blocks, sizeof(OopMapBlock) * nof_blocks); _nonstatic_oop_map_count += nof_blocks; } // collection of oops void OopMapBlocksBuilder::add(int offset, int count) { if (_nonstatic_oop_map_count == 0) { _nonstatic_oop_map_count++; } OopMapBlock* nonstatic_oop_map = last_oop_map(); if (nonstatic_oop_map->count() == 0) { // Unused map, set it up nonstatic_oop_map->set_offset(offset); nonstatic_oop_map->set_count(count); } else if (nonstatic_oop_map->is_contiguous(offset)) { // contiguous, add nonstatic_oop_map->increment_count(count); } else { // Need a new one... _nonstatic_oop_map_count++; assert(_nonstatic_oop_map_count <= _max_nonstatic_oop_maps, "range check"); nonstatic_oop_map = last_oop_map(); nonstatic_oop_map->set_offset(offset); nonstatic_oop_map->set_count(count); } } // general purpose copy, e.g. into allocated instanceKlass void OopMapBlocksBuilder::copy(OopMapBlock* dst) { if (_nonstatic_oop_map_count != 0) { memcpy(dst, _nonstatic_oop_maps, sizeof(OopMapBlock) * _nonstatic_oop_map_count); } } // Sort and compact adjacent blocks void OopMapBlocksBuilder::compact() { if (_nonstatic_oop_map_count <= 1) { return; } /* * Since field layout sneaks in oops before values, we will be able to condense * blocks. There is potential to compact between super, own refs and values * containing refs. * * Currently compaction is slightly limited due to values being 8 byte aligned. * This may well change: FixMe if it doesn't, the code below is fairly general purpose * and maybe it doesn't need to be. */ qsort(_nonstatic_oop_maps, _nonstatic_oop_map_count, sizeof(OopMapBlock), (_sort_Fn)OopMapBlock::compare_offset); if (_nonstatic_oop_map_count < 2) { return; } // Make a temp copy, and iterate through and copy back into the original ResourceMark rm; OopMapBlock* oop_maps_copy = NEW_RESOURCE_ARRAY(OopMapBlock, _nonstatic_oop_map_count); OopMapBlock* oop_maps_copy_end = oop_maps_copy + _nonstatic_oop_map_count; copy(oop_maps_copy); OopMapBlock* nonstatic_oop_map = _nonstatic_oop_maps; unsigned int new_count = 1; oop_maps_copy++; while(oop_maps_copy < oop_maps_copy_end) { assert(nonstatic_oop_map->offset() < oop_maps_copy->offset(), "invariant"); if (nonstatic_oop_map->is_contiguous(oop_maps_copy->offset())) { nonstatic_oop_map->increment_count(oop_maps_copy->count()); } else { nonstatic_oop_map++; new_count++; nonstatic_oop_map->set_offset(oop_maps_copy->offset()); nonstatic_oop_map->set_count(oop_maps_copy->count()); } oop_maps_copy++; } assert(new_count <= _nonstatic_oop_map_count, "end up with more maps after compact() ?"); _nonstatic_oop_map_count = new_count; } void OopMapBlocksBuilder::print_on(outputStream* st) const { st->print_cr(" OopMapBlocks: %3d /%3d", _nonstatic_oop_map_count, _max_nonstatic_oop_maps); if (_nonstatic_oop_map_count > 0) { OopMapBlock* map = _nonstatic_oop_maps; OopMapBlock* last_map = last_oop_map(); assert(map <= last_map, "Last less than first"); while (map <= last_map) { st->print_cr(" Offset: %3d -%3d Count: %3d", map->offset(), map->offset() + map->offset_span() - heapOopSize, map->count()); map++; } } } void OopMapBlocksBuilder::print_value_on(outputStream* st) const { print_on(st); } void ClassFileParser::set_precomputed_flags(InstanceKlass* ik) { assert(ik != nullptr, "invariant"); const InstanceKlass* const super = ik->java_super(); // Check if this klass has an empty finalize method (i.e. one with return bytecode only), // in which case we don't have to register objects as finalizable if (!_has_empty_finalizer) { if (_has_finalizer || (super != nullptr && super->has_finalizer())) { ik->set_has_finalizer(); } } #ifdef ASSERT bool f = false; const Method* const m = ik->lookup_method(vmSymbols::finalize_method_name(), vmSymbols::void_method_signature()); if (InstanceKlass::is_finalization_enabled() && (m != nullptr) && !m->is_empty_method()) { f = true; } // Spec doesn't prevent agent from redefinition of empty finalizer. // Despite the fact that it's generally bad idea and redefined finalizer // will not work as expected we shouldn't abort vm in this case if (!ik->has_redefined_this_or_super()) { assert(ik->has_finalizer() == f, "inconsistent has_finalizer"); } #endif // Check if this klass supports the java.lang.Cloneable interface if (vmClasses::Cloneable_klass_loaded()) { if (ik->is_subtype_of(vmClasses::Cloneable_klass())) { ik->set_is_cloneable(); } } // If it cannot be fast-path allocated, set a bit in the layout helper. // See documentation of InstanceKlass::can_be_fastpath_allocated(). assert(ik->size_helper() > 0, "layout_helper is initialized"); if (ik->is_abstract() || ik->is_interface() || (ik->name() == vmSymbols::java_lang_Class() && ik->class_loader() == nullptr) || ik->size_helper() >= FastAllocateSizeLimit) { // Forbid fast-path allocation. const jint lh = Klass::instance_layout_helper(ik->size_helper(), true); ik->set_layout_helper(lh); } } // utility methods for appending an array with check for duplicates static void append_interfaces(GrowableArray* result, const Array* const ifs) { // iterate over new interfaces for (int i = 0; i < ifs->length(); i++) { InstanceKlass* const e = ifs->at(i); assert(e->is_klass() && e->is_interface(), "just checking"); // add new interface result->append_if_missing(e); } } static Array* compute_transitive_interfaces(const InstanceKlass* super, Array* local_ifs, ClassLoaderData* loader_data, TRAPS) { assert(local_ifs != nullptr, "invariant"); assert(loader_data != nullptr, "invariant"); // Compute maximum size for transitive interfaces int max_transitive_size = 0; int super_size = 0; // Add superclass transitive interfaces size if (super != nullptr) { super_size = super->transitive_interfaces()->length(); max_transitive_size += super_size; } // Add local interfaces' super interfaces const int local_size = local_ifs->length(); for (int i = 0; i < local_size; i++) { InstanceKlass* const l = local_ifs->at(i); max_transitive_size += l->transitive_interfaces()->length(); } // Finally add local interfaces max_transitive_size += local_size; // Construct array if (max_transitive_size == 0) { // no interfaces, use canonicalized array return Universe::the_empty_instance_klass_array(); } else if (max_transitive_size == super_size) { // no new local interfaces added, share superklass' transitive interface array return super->transitive_interfaces(); } else if (max_transitive_size == local_size) { // only local interfaces added, share local interface array return local_ifs; } else { ResourceMark rm; GrowableArray* const result = new GrowableArray(max_transitive_size); // Copy down from superclass if (super != nullptr) { append_interfaces(result, super->transitive_interfaces()); } // Copy down from local interfaces' superinterfaces for (int i = 0; i < local_size; i++) { InstanceKlass* const l = local_ifs->at(i); append_interfaces(result, l->transitive_interfaces()); } // Finally add local interfaces append_interfaces(result, local_ifs); // length will be less than the max_transitive_size if duplicates were removed const int length = result->length(); assert(length <= max_transitive_size, "just checking"); Array* const new_result = MetadataFactory::new_array(loader_data, length, CHECK_NULL); for (int i = 0; i < length; i++) { InstanceKlass* const e = result->at(i); assert(e != nullptr, "just checking"); new_result->at_put(i, e); } return new_result; } } void ClassFileParser::check_super_class_access(const InstanceKlass* this_klass, TRAPS) { assert(this_klass != nullptr, "invariant"); const Klass* const super = this_klass->super(); if (super != nullptr) { const InstanceKlass* super_ik = InstanceKlass::cast(super); if (super->is_final()) { classfile_icce_error("class %s cannot inherit from final class %s", super_ik, THREAD); return; } if (super_ik->is_sealed() && !super_ik->has_as_permitted_subclass(this_klass)) { classfile_icce_error("class %s cannot inherit from sealed class %s", super_ik, THREAD); return; } Reflection::VerifyClassAccessResults vca_result = Reflection::verify_class_access(this_klass, InstanceKlass::cast(super), false); if (vca_result != Reflection::ACCESS_OK) { ResourceMark rm(THREAD); char* msg = Reflection::verify_class_access_msg(this_klass, InstanceKlass::cast(super), vca_result); if (msg == nullptr) { bool same_module = (this_klass->module() == super->module()); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "class %s cannot access its %ssuperclass %s (%s%s%s)", this_klass->external_name(), super->is_abstract() ? "abstract " : "", super->external_name(), (same_module) ? this_klass->joint_in_module_of_loader(super) : this_klass->class_in_module_of_loader(), (same_module) ? "" : "; ", (same_module) ? "" : super->class_in_module_of_loader()); } else { // Add additional message content. Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "superclass access check failed: %s", msg); } } } } void ClassFileParser::check_super_interface_access(const InstanceKlass* this_klass, TRAPS) { assert(this_klass != nullptr, "invariant"); const Array* const local_interfaces = this_klass->local_interfaces(); const int lng = local_interfaces->length(); for (int i = lng - 1; i >= 0; i--) { InstanceKlass* const k = local_interfaces->at(i); assert (k != nullptr && k->is_interface(), "invalid interface"); if (k->is_sealed() && !k->has_as_permitted_subclass(this_klass)) { classfile_icce_error(this_klass->is_interface() ? "class %s cannot extend sealed interface %s" : "class %s cannot implement sealed interface %s", k, THREAD); return; } Reflection::VerifyClassAccessResults vca_result = Reflection::verify_class_access(this_klass, k, false); if (vca_result != Reflection::ACCESS_OK) { ResourceMark rm(THREAD); char* msg = Reflection::verify_class_access_msg(this_klass, k, vca_result); if (msg == nullptr) { bool same_module = (this_klass->module() == k->module()); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "class %s cannot access its superinterface %s (%s%s%s)", this_klass->external_name(), k->external_name(), (same_module) ? this_klass->joint_in_module_of_loader(k) : this_klass->class_in_module_of_loader(), (same_module) ? "" : "; ", (same_module) ? "" : k->class_in_module_of_loader()); return; } else { // Add additional message content. Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_IllegalAccessError(), "superinterface check failed: %s", msg); return; } } } } static void check_final_method_override(const InstanceKlass* this_klass, TRAPS) { assert(this_klass != nullptr, "invariant"); const Array* const methods = this_klass->methods(); const int num_methods = methods->length(); // go thru each method and check if it overrides a final method for (int index = 0; index < num_methods; index++) { const Method* const m = methods->at(index); // skip private, static, and methods if ((!m->is_private() && !m->is_static()) && (m->name() != vmSymbols::object_initializer_name())) { const Symbol* const name = m->name(); const Symbol* const signature = m->signature(); const InstanceKlass* k = this_klass->java_super(); const Method* super_m = nullptr; while (k != nullptr) { // skip supers that don't have final methods. if (k->has_final_method()) { // lookup a matching method in the super class hierarchy super_m = InstanceKlass::cast(k)->lookup_method(name, signature); if (super_m == nullptr) { break; // didn't find any match; get out } if (super_m->is_final() && !super_m->is_static() && !super_m->access_flags().is_private()) { // matching method in super is final, and not static or private bool can_access = Reflection::verify_member_access(this_klass, super_m->method_holder(), super_m->method_holder(), super_m->access_flags(), false, false, CHECK); if (can_access) { // this class can access super final method and therefore override ResourceMark rm(THREAD); THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), err_msg("class %s overrides final method %s.%s%s", this_klass->external_name(), super_m->method_holder()->external_name(), name->as_C_string(), signature->as_C_string())); } } // continue to look from super_m's holder's super. k = super_m->method_holder()->java_super(); continue; } k = k->java_super(); } } } } // assumes that this_klass is an interface static void check_illegal_static_method(const InstanceKlass* this_klass, TRAPS) { assert(this_klass != nullptr, "invariant"); assert(this_klass->is_interface(), "not an interface"); const Array* methods = this_klass->methods(); const int num_methods = methods->length(); for (int index = 0; index < num_methods; index++) { const Method* const m = methods->at(index); // if m is static and not the init method, throw a verify error if ((m->is_static()) && (m->name() != vmSymbols::class_initializer_name())) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_VerifyError(), "Illegal static method %s in interface %s", m->name()->as_C_string(), this_klass->external_name() ); return; } } } // utility methods for format checking void ClassFileParser::verify_legal_class_modifiers(jint flags, TRAPS) const { const bool is_module = (flags & JVM_ACC_MODULE) != 0; assert(_major_version >= JAVA_9_VERSION || !is_module, "JVM_ACC_MODULE should not be set"); if (is_module) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_NoClassDefFoundError(), "%s is not a class because access_flag ACC_MODULE is set", _class_name->as_C_string()); return; } if (!_need_verify) { return; } const bool is_interface = (flags & JVM_ACC_INTERFACE) != 0; const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; const bool is_final = (flags & JVM_ACC_FINAL) != 0; const bool is_super = (flags & JVM_ACC_SUPER) != 0; const bool is_enum = (flags & JVM_ACC_ENUM) != 0; const bool is_annotation = (flags & JVM_ACC_ANNOTATION) != 0; const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; if ((is_abstract && is_final) || (is_interface && !is_abstract) || (is_interface && major_gte_1_5 && (is_super || is_enum)) || (!is_interface && major_gte_1_5 && is_annotation)) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal class modifiers in class %s: 0x%X", _class_name->as_C_string(), flags ); return; } } static bool has_illegal_visibility(jint flags) { const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; return ((is_public && is_protected) || (is_public && is_private) || (is_protected && is_private)); } // A legal major_version.minor_version must be one of the following: // // Major_version >= 45 and major_version < 56, any minor_version. // Major_version >= 56 and major_version <= JVM_CLASSFILE_MAJOR_VERSION and minor_version = 0. // Major_version = JVM_CLASSFILE_MAJOR_VERSION and minor_version = 65535 and --enable-preview is present. // void ClassFileParser::verify_class_version(u2 major, u2 minor, Symbol* class_name, TRAPS){ ResourceMark rm(THREAD); const u2 max_version = JVM_CLASSFILE_MAJOR_VERSION; if (major < JAVA_MIN_SUPPORTED_VERSION) { classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid major version", class_name, major, minor, THREAD); return; } if (major > max_version) { Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_UnsupportedClassVersionError(), "%s has been compiled by a more recent version of the Java Runtime (class file version %u.%u), " "this version of the Java Runtime only recognizes class file versions up to %u.0", class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION); return; } if (major < JAVA_12_VERSION || minor == 0) { return; } if (minor == JAVA_PREVIEW_MINOR_VERSION) { if (major != max_version) { Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_UnsupportedClassVersionError(), "%s (class file version %u.%u) was compiled with preview features that are unsupported. " "This version of the Java Runtime only recognizes preview features for class file version %u.%u", class_name->as_C_string(), major, minor, JVM_CLASSFILE_MAJOR_VERSION, JAVA_PREVIEW_MINOR_VERSION); return; } if (!Arguments::enable_preview()) { classfile_ucve_error("Preview features are not enabled for %s (class file version %u.%u). Try running with '--enable-preview'", class_name, major, minor, THREAD); return; } } else { // minor != JAVA_PREVIEW_MINOR_VERSION classfile_ucve_error("%s (class file version %u.%u) was compiled with an invalid non-zero minor version", class_name, major, minor, THREAD); } } void ClassFileParser::verify_legal_field_modifiers(jint flags, bool is_interface, TRAPS) const { if (!_need_verify) { return; } const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; const bool is_static = (flags & JVM_ACC_STATIC) != 0; const bool is_final = (flags & JVM_ACC_FINAL) != 0; const bool is_volatile = (flags & JVM_ACC_VOLATILE) != 0; const bool is_transient = (flags & JVM_ACC_TRANSIENT) != 0; const bool is_enum = (flags & JVM_ACC_ENUM) != 0; const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; bool is_illegal = false; if (is_interface) { if (!is_public || !is_static || !is_final || is_private || is_protected || is_volatile || is_transient || (major_gte_1_5 && is_enum)) { is_illegal = true; } } else { // not interface if (has_illegal_visibility(flags) || (is_final && is_volatile)) { is_illegal = true; } } if (is_illegal) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal field modifiers in class %s: 0x%X", _class_name->as_C_string(), flags); return; } } void ClassFileParser::verify_legal_method_modifiers(jint flags, bool is_interface, const Symbol* name, TRAPS) const { if (!_need_verify) { return; } const bool is_public = (flags & JVM_ACC_PUBLIC) != 0; const bool is_private = (flags & JVM_ACC_PRIVATE) != 0; const bool is_static = (flags & JVM_ACC_STATIC) != 0; const bool is_final = (flags & JVM_ACC_FINAL) != 0; const bool is_native = (flags & JVM_ACC_NATIVE) != 0; const bool is_abstract = (flags & JVM_ACC_ABSTRACT) != 0; const bool is_bridge = (flags & JVM_ACC_BRIDGE) != 0; const bool is_strict = (flags & JVM_ACC_STRICT) != 0; const bool is_synchronized = (flags & JVM_ACC_SYNCHRONIZED) != 0; const bool is_protected = (flags & JVM_ACC_PROTECTED) != 0; const bool major_gte_1_5 = _major_version >= JAVA_1_5_VERSION; const bool major_gte_8 = _major_version >= JAVA_8_VERSION; const bool major_gte_17 = _major_version >= JAVA_17_VERSION; const bool is_initializer = (name == vmSymbols::object_initializer_name()); bool is_illegal = false; if (is_interface) { if (major_gte_8) { // Class file version is JAVA_8_VERSION or later Methods of // interfaces may set any of the flags except ACC_PROTECTED, // ACC_FINAL, ACC_NATIVE, and ACC_SYNCHRONIZED; they must // have exactly one of the ACC_PUBLIC or ACC_PRIVATE flags set. if ((is_public == is_private) || /* Only one of private and public should be true - XNOR */ (is_native || is_protected || is_final || is_synchronized) || // If a specific method of a class or interface has its // ACC_ABSTRACT flag set, it must not have any of its // ACC_FINAL, ACC_NATIVE, ACC_PRIVATE, ACC_STATIC, // ACC_STRICT, or ACC_SYNCHRONIZED flags set. No need to // check for ACC_FINAL, ACC_NATIVE or ACC_SYNCHRONIZED as // those flags are illegal irrespective of ACC_ABSTRACT being set or not. (is_abstract && (is_private || is_static || (!major_gte_17 && is_strict)))) { is_illegal = true; } } else if (major_gte_1_5) { // Class file version in the interval [JAVA_1_5_VERSION, JAVA_8_VERSION) if (!is_public || is_private || is_protected || is_static || is_final || is_synchronized || is_native || !is_abstract || is_strict) { is_illegal = true; } } else { // Class file version is pre-JAVA_1_5_VERSION if (!is_public || is_static || is_final || is_native || !is_abstract) { is_illegal = true; } } } else { // not interface if (has_illegal_visibility(flags)) { is_illegal = true; } else { if (is_initializer) { if (is_static || is_final || is_synchronized || is_native || is_abstract || (major_gte_1_5 && is_bridge)) { is_illegal = true; } } else { // not initializer if (is_abstract) { if ((is_final || is_native || is_private || is_static || (major_gte_1_5 && (is_synchronized || (!major_gte_17 && is_strict))))) { is_illegal = true; } } } } } if (is_illegal) { ResourceMark rm(THREAD); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Method %s in class %s has illegal modifiers: 0x%X", name->as_C_string(), _class_name->as_C_string(), flags); return; } } void ClassFileParser::verify_legal_utf8(const unsigned char* buffer, int length, TRAPS) const { assert(_need_verify, "only called when _need_verify is true"); // Note: 0 <= length < 64K, as it comes from a u2 entry in the CP. if (!UTF8::is_legal_utf8(buffer, static_cast(length), _major_version <= 47)) { classfile_parse_error("Illegal UTF8 string in constant pool in class file %s", THREAD); } } // Unqualified names may not contain the characters '.', ';', '[', or '/'. // In class names, '/' separates unqualified names. This is verified in this function also. // Method names also may not contain the characters '<' or '>', unless // or . Note that method names may not be or in this // method. Because these names have been checked as special cases before // calling this method in verify_legal_method_name. // // This method is also called from the modular system APIs in modules.cpp // to verify the validity of module and package names. bool ClassFileParser::verify_unqualified_name(const char* name, unsigned int length, int type) { if (length == 0) return false; // Must have at least one char. for (const char* p = name; p != name + length; p++) { switch(*p) { case JVM_SIGNATURE_DOT: case JVM_SIGNATURE_ENDCLASS: case JVM_SIGNATURE_ARRAY: // do not permit '.', ';', or '[' return false; case JVM_SIGNATURE_SLASH: // check for '//' or leading or trailing '/' which are not legal // unqualified name must not be empty if (type == ClassFileParser::LegalClass) { if (p == name || p+1 >= name+length || *(p+1) == JVM_SIGNATURE_SLASH) { return false; } } else { return false; // do not permit '/' unless it's class name } break; case JVM_SIGNATURE_SPECIAL: case JVM_SIGNATURE_ENDSPECIAL: // do not permit '<' or '>' in method names if (type == ClassFileParser::LegalMethod) { return false; } } } return true; } // Take pointer to a UTF8 byte string (not NUL-terminated). // Skip over the longest part of the string that could // be taken as a fieldname. Allow non-trailing '/'s if slash_ok is true. // Return a pointer to just past the fieldname. // Return null if no fieldname at all was found, or in the case of slash_ok // being true, we saw consecutive slashes (meaning we were looking for a // qualified path but found something that was badly-formed). static const char* skip_over_field_name(const char* const name, bool slash_ok, unsigned int length) { const char* p; jboolean last_is_slash = false; jboolean not_first_ch = false; for (p = name; p != name + length; not_first_ch = true) { const char* old_p = p; jchar ch = *p; if (ch < 128) { p++; // quick check for ascii if ((ch >= 'a' && ch <= 'z') || (ch >= 'A' && ch <= 'Z') || (ch == '_' || ch == '$') || (not_first_ch && ch >= '0' && ch <= '9')) { last_is_slash = false; continue; } if (slash_ok && ch == JVM_SIGNATURE_SLASH) { if (last_is_slash) { return nullptr; // Don't permit consecutive slashes } last_is_slash = true; continue; } } else { jint unicode_ch; char* tmp_p = UTF8::next_character(p, &unicode_ch); p = tmp_p; last_is_slash = false; // Check if ch is Java identifier start or is Java identifier part // 4672820: call java.lang.Character methods directly without generating separate tables. EXCEPTION_MARK; // return value JavaValue result(T_BOOLEAN); // Set up the arguments to isJavaIdentifierStart or isJavaIdentifierPart JavaCallArguments args; args.push_int(unicode_ch); if (not_first_ch) { // public static boolean isJavaIdentifierPart(char ch); JavaCalls::call_static(&result, vmClasses::Character_klass(), vmSymbols::isJavaIdentifierPart_name(), vmSymbols::int_bool_signature(), &args, THREAD); } else { // public static boolean isJavaIdentifierStart(char ch); JavaCalls::call_static(&result, vmClasses::Character_klass(), vmSymbols::isJavaIdentifierStart_name(), vmSymbols::int_bool_signature(), &args, THREAD); } if (HAS_PENDING_EXCEPTION) { CLEAR_PENDING_EXCEPTION; return nullptr; } if(result.get_jboolean()) { continue; } } return (not_first_ch) ? old_p : nullptr; } return (not_first_ch && !last_is_slash) ? p : nullptr; } // Take pointer to a UTF8 byte string (not NUL-terminated). // Skip over the longest part of the string that could // be taken as a field signature. Allow "void" if void_ok. // Return a pointer to just past the signature. // Return null if no legal signature is found. const char* ClassFileParser::skip_over_field_signature(const char* signature, bool void_ok, unsigned int length, TRAPS) const { unsigned int array_dim = 0; while (length > 0) { switch (signature[0]) { case JVM_SIGNATURE_VOID: if (!void_ok) { return nullptr; } case JVM_SIGNATURE_BOOLEAN: case JVM_SIGNATURE_BYTE: case JVM_SIGNATURE_CHAR: case JVM_SIGNATURE_SHORT: case JVM_SIGNATURE_INT: case JVM_SIGNATURE_FLOAT: case JVM_SIGNATURE_LONG: case JVM_SIGNATURE_DOUBLE: return signature + 1; case JVM_SIGNATURE_CLASS: { if (_major_version < JAVA_1_5_VERSION) { // Skip over the class name if one is there const char* const p = skip_over_field_name(signature + 1, true, --length); // The next character better be a semicolon if (p && (p - signature) > 1 && p[0] == JVM_SIGNATURE_ENDCLASS) { return p + 1; } } else { // Skip leading 'L' and ignore first appearance of ';' signature++; const char* c = (const char*) memchr(signature, JVM_SIGNATURE_ENDCLASS, length - 1); // Format check signature if (c != nullptr) { int newlen = pointer_delta_as_int(c, (char*) signature); bool legal = verify_unqualified_name(signature, newlen, LegalClass); if (!legal) { classfile_parse_error("Class name is empty or contains illegal character " "in descriptor in class file %s", THREAD); return nullptr; } return signature + newlen + 1; } } return nullptr; } case JVM_SIGNATURE_ARRAY: array_dim++; if (array_dim > 255) { // 4277370: array descriptor is valid only if it represents 255 or fewer dimensions. classfile_parse_error("Array type descriptor has more than 255 dimensions in class file %s", THREAD); return nullptr; } // The rest of what's there better be a legal signature signature++; length--; void_ok = false; break; default: return nullptr; } } return nullptr; } // Checks if name is a legal class name. void ClassFileParser::verify_legal_class_name(const Symbol* name, TRAPS) const { if (!_need_verify) { return; } assert(name->refcount() > 0, "symbol must be kept alive"); char* bytes = (char*)name->bytes(); unsigned int length = name->utf8_length(); bool legal = false; if (length > 0) { const char* p; if (bytes[0] == JVM_SIGNATURE_ARRAY) { p = skip_over_field_signature(bytes, false, length, CHECK); legal = (p != nullptr) && ((p - bytes) == (int)length); } else if (_major_version < JAVA_1_5_VERSION) { if (bytes[0] != JVM_SIGNATURE_SPECIAL) { p = skip_over_field_name(bytes, true, length); legal = (p != nullptr) && ((p - bytes) == (int)length); } } else { // 4900761: relax the constraints based on JSR202 spec // Class names may be drawn from the entire Unicode character set. // Identifiers between '/' must be unqualified names. // The utf8 string has been verified when parsing cpool entries. legal = verify_unqualified_name(bytes, length, LegalClass); } } if (!legal) { ResourceMark rm(THREAD); assert(_class_name != nullptr, "invariant"); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal class name \"%.*s\" in class file %s", length, bytes, _class_name->as_C_string() ); return; } } // Checks if name is a legal field name. void ClassFileParser::verify_legal_field_name(const Symbol* name, TRAPS) const { if (!_need_verify) { return; } char* bytes = (char*)name->bytes(); unsigned int length = name->utf8_length(); bool legal = false; if (length > 0) { if (_major_version < JAVA_1_5_VERSION) { if (bytes[0] != JVM_SIGNATURE_SPECIAL) { const char* p = skip_over_field_name(bytes, false, length); legal = (p != nullptr) && ((p - bytes) == (int)length); } } else { // 4881221: relax the constraints based on JSR202 spec legal = verify_unqualified_name(bytes, length, LegalField); } } if (!legal) { ResourceMark rm(THREAD); assert(_class_name != nullptr, "invariant"); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal field name \"%.*s\" in class %s", length, bytes, _class_name->as_C_string() ); return; } } // Checks if name is a legal method name. void ClassFileParser::verify_legal_method_name(const Symbol* name, TRAPS) const { if (!_need_verify) { return; } assert(name != nullptr, "method name is null"); char* bytes = (char*)name->bytes(); unsigned int length = name->utf8_length(); bool legal = false; if (length > 0) { if (bytes[0] == JVM_SIGNATURE_SPECIAL) { if (name == vmSymbols::object_initializer_name() || name == vmSymbols::class_initializer_name()) { legal = true; } } else if (_major_version < JAVA_1_5_VERSION) { const char* p; p = skip_over_field_name(bytes, false, length); legal = (p != nullptr) && ((p - bytes) == (int)length); } else { // 4881221: relax the constraints based on JSR202 spec legal = verify_unqualified_name(bytes, length, LegalMethod); } } if (!legal) { ResourceMark rm(THREAD); assert(_class_name != nullptr, "invariant"); Exceptions::fthrow( THREAD_AND_LOCATION, vmSymbols::java_lang_ClassFormatError(), "Illegal method name \"%.*s\" in class %s", length, bytes, _class_name->as_C_string() ); return; } } // Checks if signature is a legal field signature. void ClassFileParser::verify_legal_field_signature(const Symbol* name, const Symbol* signature, TRAPS) const { if (!_need_verify) { return; } const char* const bytes = (const char*)signature->bytes(); const unsigned int length = signature->utf8_length(); const char* const p = skip_over_field_signature(bytes, false, length, CHECK); if (p == nullptr || (p - bytes) != (int)length) { throwIllegalSignature("Field", name, signature, CHECK); } } // Check that the signature is compatible with the method name. For example, // check that has a void signature. void ClassFileParser::verify_legal_name_with_signature(const Symbol* name, const Symbol* signature, TRAPS) const { if (!_need_verify) { return; } // Class initializers cannot have args for class format version >= 51. if (name == vmSymbols::class_initializer_name() && signature != vmSymbols::void_method_signature() && _major_version >= JAVA_7_VERSION) { throwIllegalSignature("Method", name, signature, THREAD); return; } int sig_length = signature->utf8_length(); if (name->utf8_length() > 0 && name->char_at(0) == JVM_SIGNATURE_SPECIAL && sig_length > 0 && signature->char_at(sig_length - 1) != JVM_SIGNATURE_VOID) { throwIllegalSignature("Method", name, signature, THREAD); } } // Checks if signature is a legal method signature. // Returns number of parameters int ClassFileParser::verify_legal_method_signature(const Symbol* name, const Symbol* signature, TRAPS) const { if (!_need_verify) { // make sure caller's args_size will be less than 0 even for non-static // method so it will be recomputed in compute_size_of_parameters(). return -2; } unsigned int args_size = 0; const char* p = (const char*)signature->bytes(); unsigned int length = signature->utf8_length(); const char* nextp; // The first character must be a '(' if ((length > 0) && (*p++ == JVM_SIGNATURE_FUNC)) { length--; // Skip over legal field signatures nextp = skip_over_field_signature(p, false, length, CHECK_0); while ((length > 0) && (nextp != nullptr)) { args_size++; if (p[0] == 'J' || p[0] == 'D') { args_size++; } length -= pointer_delta_as_int(nextp, p); p = nextp; nextp = skip_over_field_signature(p, false, length, CHECK_0); } // The first non-signature thing better be a ')' if ((length > 0) && (*p++ == JVM_SIGNATURE_ENDFUNC)) { length--; // Now we better just have a return value nextp = skip_over_field_signature(p, true, length, CHECK_0); if (nextp && ((int)length == (nextp - p))) { return args_size; } } } // Report error throwIllegalSignature("Method", name, signature, THREAD); return 0; } int ClassFileParser::static_field_size() const { assert(_field_info != nullptr, "invariant"); return _field_info->_static_field_size; } int ClassFileParser::total_oop_map_count() const { assert(_field_info != nullptr, "invariant"); return _field_info->oop_map_blocks->_nonstatic_oop_map_count; } jint ClassFileParser::layout_size() const { assert(_field_info != nullptr, "invariant"); return _field_info->_instance_size; } static void check_methods_for_intrinsics(const InstanceKlass* ik, const Array* methods) { assert(ik != nullptr, "invariant"); assert(methods != nullptr, "invariant"); // Set up Method*::intrinsic_id as soon as we know the names of methods. // (We used to do this lazily, but now we query it in Rewriter, // which is eagerly done for every method, so we might as well do it now, // when everything is fresh in memory.) const vmSymbolID klass_id = Method::klass_id_for_intrinsics(ik); if (klass_id != vmSymbolID::NO_SID) { for (int j = 0; j < methods->length(); ++j) { Method* method = methods->at(j); method->init_intrinsic_id(klass_id); if (CheckIntrinsics) { // Check if an intrinsic is defined for method 'method', // but the method is not annotated with @IntrinsicCandidate. if (method->intrinsic_id() != vmIntrinsics::_none && !method->intrinsic_candidate()) { tty->print("Compiler intrinsic is defined for method [%s], " "but the method is not annotated with @IntrinsicCandidate.%s", method->name_and_sig_as_C_string(), NOT_DEBUG(" Method will not be inlined.") DEBUG_ONLY(" Exiting.") ); tty->cr(); DEBUG_ONLY(vm_exit(1)); } // Check is the method 'method' is annotated with @IntrinsicCandidate, // but there is no intrinsic available for it. if (method->intrinsic_candidate() && method->intrinsic_id() == vmIntrinsics::_none) { tty->print("Method [%s] is annotated with @IntrinsicCandidate, " "but no compiler intrinsic is defined for the method.%s", method->name_and_sig_as_C_string(), NOT_DEBUG("") DEBUG_ONLY(" Exiting.") ); tty->cr(); DEBUG_ONLY(vm_exit(1)); } } } // end for #ifdef ASSERT if (CheckIntrinsics) { // Check for orphan methods in the current class. A method m // of a class C is orphan if an intrinsic is defined for method m, // but class C does not declare m. // The check is potentially expensive, therefore it is available // only in debug builds. for (auto id : EnumRange{}) { if (vmIntrinsics::_compiledLambdaForm == id) { // The _compiledLamdbdaForm intrinsic is a special marker for bytecode // generated for the JVM from a LambdaForm and therefore no method // is defined for it. continue; } if (vmIntrinsics::_blackhole == id) { // The _blackhole intrinsic is a special marker. No explicit method // is defined for it. continue; } if (vmIntrinsics::class_for(id) == klass_id) { // Check if the current class contains a method with the same // name, flags, signature. bool match = false; for (int j = 0; j < methods->length(); ++j) { const Method* method = methods->at(j); if (method->intrinsic_id() == id) { match = true; break; } } if (!match) { char buf[1000]; tty->print("Compiler intrinsic is defined for method [%s], " "but the method is not available in class [%s].%s", vmIntrinsics::short_name_as_C_string(id, buf, sizeof(buf)), ik->name()->as_C_string(), NOT_DEBUG("") DEBUG_ONLY(" Exiting.") ); tty->cr(); DEBUG_ONLY(vm_exit(1)); } } } // end for } // CheckIntrinsics #endif // ASSERT } } InstanceKlass* ClassFileParser::create_instance_klass(bool changed_by_loadhook, const ClassInstanceInfo& cl_inst_info, TRAPS) { if (_klass != nullptr) { return _klass; } InstanceKlass* const ik = InstanceKlass::allocate_instance_klass(*this, CHECK_NULL); if (is_hidden()) { mangle_hidden_class_name(ik); } fill_instance_klass(ik, changed_by_loadhook, cl_inst_info, CHECK_NULL); assert(_klass == ik, "invariant"); return ik; } void ClassFileParser::fill_instance_klass(InstanceKlass* ik, bool changed_by_loadhook, const ClassInstanceInfo& cl_inst_info, TRAPS) { assert(ik != nullptr, "invariant"); // Set name and CLD before adding to CLD ik->set_class_loader_data(_loader_data); ik->set_name(_class_name); // Add all classes to our internal class loader list here, // including classes in the bootstrap (null) class loader. const bool publicize = !is_internal(); _loader_data->add_class(ik, publicize); set_klass_to_deallocate(ik); assert(_field_info != nullptr, "invariant"); assert(ik->static_field_size() == _field_info->_static_field_size, "sanity"); assert(ik->nonstatic_oop_map_count() == _field_info->oop_map_blocks->_nonstatic_oop_map_count, "sanity"); assert(ik->is_instance_klass(), "sanity"); assert(ik->size_helper() == _field_info->_instance_size, "sanity"); // Fill in information already parsed ik->set_should_verify_class(_need_verify); // Not yet: supers are done below to support the new subtype-checking fields ik->set_nonstatic_field_size(_field_info->_nonstatic_field_size); ik->set_has_nonstatic_fields(_field_info->_has_nonstatic_fields); ik->set_static_oop_field_count(_static_oop_count); // this transfers ownership of a lot of arrays from // the parser onto the InstanceKlass* apply_parsed_class_metadata(ik, _java_fields_count); // can only set dynamic nest-host after static nest information is set if (cl_inst_info.dynamic_nest_host() != nullptr) { ik->set_nest_host(cl_inst_info.dynamic_nest_host()); } // note that is not safe to use the fields in the parser from this point on assert(nullptr == _cp, "invariant"); assert(nullptr == _fieldinfo_stream, "invariant"); assert(nullptr == _fields_status, "invariant"); assert(nullptr == _methods, "invariant"); assert(nullptr == _inner_classes, "invariant"); assert(nullptr == _nest_members, "invariant"); assert(nullptr == _combined_annotations, "invariant"); assert(nullptr == _record_components, "invariant"); assert(nullptr == _permitted_subclasses, "invariant"); if (_has_localvariable_table) { ik->set_has_localvariable_table(true); } if (_has_final_method) { ik->set_has_final_method(); } ik->copy_method_ordering(_method_ordering, CHECK); // The InstanceKlass::_methods_jmethod_ids cache // is managed on the assumption that the initial cache // size is equal to the number of methods in the class. If // that changes, then InstanceKlass::idnum_can_increment() // has to be changed accordingly. ik->set_initial_method_idnum(checked_cast(ik->methods()->length())); ik->set_this_class_index(_this_class_index); if (_is_hidden) { // _this_class_index is a CONSTANT_Class entry that refers to this // hidden class itself. If this class needs to refer to its own methods // or fields, it would use a CONSTANT_MethodRef, etc, which would reference // _this_class_index. However, because this class is hidden (it's // not stored in SystemDictionary), _this_class_index cannot be resolved // with ConstantPool::klass_at_impl, which does a SystemDictionary lookup. // Therefore, we must eagerly resolve _this_class_index now. ik->constants()->klass_at_put(_this_class_index, ik); } ik->set_minor_version(_minor_version); ik->set_major_version(_major_version); ik->set_has_nonstatic_concrete_methods(_has_nonstatic_concrete_methods); ik->set_declares_nonstatic_concrete_methods(_declares_nonstatic_concrete_methods); assert(!_is_hidden || ik->is_hidden(), "must be set already"); // Set PackageEntry for this_klass oop cl = ik->class_loader(); Handle clh = Handle(THREAD, cl); ClassLoaderData* cld = ClassLoaderData::class_loader_data_or_null(clh()); ik->set_package(cld, nullptr, CHECK); const Array* const methods = ik->methods(); assert(methods != nullptr, "invariant"); const int methods_len = methods->length(); check_methods_for_intrinsics(ik, methods); // Fill in field values obtained by parse_classfile_attributes if (_parsed_annotations->has_any_annotations()) { _parsed_annotations->apply_to(ik); } apply_parsed_class_attributes(ik); // Miranda methods if ((_num_miranda_methods > 0) || // if this class introduced new miranda methods or (_super_klass != nullptr && _super_klass->has_miranda_methods()) // super class exists and this class inherited miranda methods ) { ik->set_has_miranda_methods(); // then set a flag } // Fill in information needed to compute superclasses. ik->initialize_supers(const_cast(_super_klass), _transitive_interfaces, CHECK); ik->set_transitive_interfaces(_transitive_interfaces); ik->set_local_interfaces(_local_interfaces); _transitive_interfaces = nullptr; _local_interfaces = nullptr; // Initialize itable offset tables klassItable::setup_itable_offset_table(ik); // Compute transitive closure of interfaces this class implements // Do final class setup OopMapBlocksBuilder* oop_map_blocks = _field_info->oop_map_blocks; if (oop_map_blocks->_nonstatic_oop_map_count > 0) { oop_map_blocks->copy(ik->start_of_nonstatic_oop_maps()); } if (_has_contended_fields || _parsed_annotations->is_contended() || ( _super_klass != nullptr && _super_klass->has_contended_annotations())) { ik->set_has_contended_annotations(true); } // Fill in has_finalizer and layout_helper set_precomputed_flags(ik); // check if this class can access its super class check_super_class_access(ik, CHECK); // check if this class can access its superinterfaces check_super_interface_access(ik, CHECK); // check if this class overrides any final method check_final_method_override(ik, CHECK); // reject static interface methods prior to Java 8 if (ik->is_interface() && _major_version < JAVA_8_VERSION) { check_illegal_static_method(ik, CHECK); } // Obtain this_klass' module entry ModuleEntry* module_entry = ik->module(); assert(module_entry != nullptr, "module_entry should always be set"); // Obtain java.lang.Module Handle module_handle(THREAD, module_entry->module()); // Allocate mirror and initialize static fields // The create_mirror() call will also call compute_modifiers() java_lang_Class::create_mirror(ik, Handle(THREAD, _loader_data->class_loader()), module_handle, _protection_domain, cl_inst_info.class_data(), CHECK); assert(_all_mirandas != nullptr, "invariant"); // Generate any default methods - default methods are public interface methods // that have a default implementation. This is new with Java 8. if (_has_nonstatic_concrete_methods) { DefaultMethods::generate_default_methods(ik, _all_mirandas, CHECK); } // Add read edges to the unnamed modules of the bootstrap and app class loaders. if (changed_by_loadhook && !module_handle.is_null() && module_entry->is_named() && !module_entry->has_default_read_edges()) { if (!module_entry->set_has_default_read_edges()) { // We won a potential race JvmtiExport::add_default_read_edges(module_handle, THREAD); } } ClassLoadingService::notify_class_loaded(ik, false /* not shared class */); if (!is_internal()) { ik->print_class_load_logging(_loader_data, module_entry, _stream); if (ik->minor_version() == JAVA_PREVIEW_MINOR_VERSION && ik->major_version() == JVM_CLASSFILE_MAJOR_VERSION && log_is_enabled(Info, class, preview)) { ResourceMark rm; log_info(class, preview)("Loading class %s that depends on preview features (class file version %d.65535)", ik->external_name(), JVM_CLASSFILE_MAJOR_VERSION); } if (log_is_enabled(Debug, class, resolve)) { ResourceMark rm; // print out the superclass. const char * from = ik->external_name(); if (ik->java_super() != nullptr) { log_debug(class, resolve)("%s %s (super)", from, ik->java_super()->external_name()); } // print out each of the interface classes referred to by this class. const Array* const local_interfaces = ik->local_interfaces(); if (local_interfaces != nullptr) { const int length = local_interfaces->length(); for (int i = 0; i < length; i++) { const InstanceKlass* const k = local_interfaces->at(i); const char * to = k->external_name(); log_debug(class, resolve)("%s %s (interface)", from, to); } } } } JFR_ONLY(INIT_ID(ik);) // If we reach here, all is well. // Now remove the InstanceKlass* from the _klass_to_deallocate field // in order for it to not be destroyed in the ClassFileParser destructor. set_klass_to_deallocate(nullptr); // it's official set_klass(ik); debug_only(ik->verify();) } void ClassFileParser::update_class_name(Symbol* new_class_name) { // Decrement the refcount in the old name, since we're clobbering it. _class_name->decrement_refcount(); _class_name = new_class_name; // Increment the refcount of the new name. // Now the ClassFileParser owns this name and will decrement in // the destructor. _class_name->increment_refcount(); } ClassFileParser::ClassFileParser(ClassFileStream* stream, Symbol* name, ClassLoaderData* loader_data, const ClassLoadInfo* cl_info, Publicity pub_level, TRAPS) : _stream(stream), _class_name(nullptr), _loader_data(loader_data), _is_hidden(cl_info->is_hidden()), _can_access_vm_annotations(cl_info->can_access_vm_annotations()), _orig_cp_size(0), _static_oop_count(0), _super_klass(), _cp(nullptr), _fieldinfo_stream(nullptr), _fields_status(nullptr), _methods(nullptr), _inner_classes(nullptr), _nest_members(nullptr), _nest_host(0), _permitted_subclasses(nullptr), _record_components(nullptr), _local_interfaces(nullptr), _transitive_interfaces(nullptr), _combined_annotations(nullptr), _class_annotations(nullptr), _class_type_annotations(nullptr), _fields_annotations(nullptr), _fields_type_annotations(nullptr), _klass(nullptr), _klass_to_deallocate(nullptr), _parsed_annotations(nullptr), _field_info(nullptr), _temp_field_info(nullptr), _method_ordering(nullptr), _all_mirandas(nullptr), _vtable_size(0), _itable_size(0), _num_miranda_methods(0), _protection_domain(cl_info->protection_domain()), _access_flags(), _pub_level(pub_level), _bad_constant_seen(0), _synthetic_flag(false), _sde_length(false), _sde_buffer(nullptr), _sourcefile_index(0), _generic_signature_index(0), _major_version(0), _minor_version(0), _this_class_index(0), _super_class_index(0), _itfs_len(0), _java_fields_count(0), _need_verify(false), _has_nonstatic_concrete_methods(false), _declares_nonstatic_concrete_methods(false), _has_localvariable_table(false), _has_final_method(false), _has_contended_fields(false), _has_finalizer(false), _has_empty_finalizer(false), _max_bootstrap_specifier_index(-1) { _class_name = name != nullptr ? name : vmSymbols::unknown_class_name(); _class_name->increment_refcount(); assert(_loader_data != nullptr, "invariant"); assert(stream != nullptr, "invariant"); assert(_stream != nullptr, "invariant"); assert(_stream->buffer() == _stream->current(), "invariant"); assert(_class_name != nullptr, "invariant"); assert(0 == _access_flags.as_int(), "invariant"); // Figure out whether we can skip format checking (matching classic VM behavior) _need_verify = Verifier::should_verify_for(_loader_data->class_loader()); // synch back verification state to stream to check for truncation. stream->set_need_verify(_need_verify); parse_stream(stream, CHECK); post_process_parsed_stream(stream, _cp, CHECK); } void ClassFileParser::clear_class_metadata() { // metadata created before the instance klass is created. Must be // deallocated if classfile parsing returns an error. _cp = nullptr; _fieldinfo_stream = nullptr; _fields_status = nullptr; _methods = nullptr; _inner_classes = nullptr; _nest_members = nullptr; _permitted_subclasses = nullptr; _combined_annotations = nullptr; _class_annotations = _class_type_annotations = nullptr; _fields_annotations = _fields_type_annotations = nullptr; _record_components = nullptr; } // Destructor to clean up ClassFileParser::~ClassFileParser() { _class_name->decrement_refcount(); if (_cp != nullptr) { MetadataFactory::free_metadata(_loader_data, _cp); } if (_fieldinfo_stream != nullptr) { MetadataFactory::free_array(_loader_data, _fieldinfo_stream); } if (_fields_status != nullptr) { MetadataFactory::free_array(_loader_data, _fields_status); } if (_methods != nullptr) { // Free methods InstanceKlass::deallocate_methods(_loader_data, _methods); } // beware of the Universe::empty_blah_array!! if (_inner_classes != nullptr && _inner_classes != Universe::the_empty_short_array()) { MetadataFactory::free_array(_loader_data, _inner_classes); } if (_nest_members != nullptr && _nest_members != Universe::the_empty_short_array()) { MetadataFactory::free_array(_loader_data, _nest_members); } if (_record_components != nullptr) { InstanceKlass::deallocate_record_components(_loader_data, _record_components); } if (_permitted_subclasses != nullptr && _permitted_subclasses != Universe::the_empty_short_array()) { MetadataFactory::free_array(_loader_data, _permitted_subclasses); } // Free interfaces InstanceKlass::deallocate_interfaces(_loader_data, _super_klass, _local_interfaces, _transitive_interfaces); if (_combined_annotations != nullptr) { // After all annotations arrays have been created, they are installed into the // Annotations object that will be assigned to the InstanceKlass being created. // Deallocate the Annotations object and the installed annotations arrays. _combined_annotations->deallocate_contents(_loader_data); // If the _combined_annotations pointer is non-null, // then the other annotations fields should have been cleared. assert(_class_annotations == nullptr, "Should have been cleared"); assert(_class_type_annotations == nullptr, "Should have been cleared"); assert(_fields_annotations == nullptr, "Should have been cleared"); assert(_fields_type_annotations == nullptr, "Should have been cleared"); } else { // If the annotations arrays were not installed into the Annotations object, // then they have to be deallocated explicitly. MetadataFactory::free_array(_loader_data, _class_annotations); MetadataFactory::free_array(_loader_data, _class_type_annotations); Annotations::free_contents(_loader_data, _fields_annotations); Annotations::free_contents(_loader_data, _fields_type_annotations); } clear_class_metadata(); _transitive_interfaces = nullptr; _local_interfaces = nullptr; // deallocate the klass if already created. Don't directly deallocate, but add // to the deallocate list so that the klass is removed from the CLD::_klasses list // at a safepoint. if (_klass_to_deallocate != nullptr) { _loader_data->add_to_deallocate_list(_klass_to_deallocate); } } void ClassFileParser::parse_stream(const ClassFileStream* const stream, TRAPS) { assert(stream != nullptr, "invariant"); assert(_class_name != nullptr, "invariant"); // BEGIN STREAM PARSING stream->guarantee_more(8, CHECK); // magic, major, minor // Magic value const u4 magic = stream->get_u4_fast(); guarantee_property(magic == JAVA_CLASSFILE_MAGIC, "Incompatible magic value %u in class file %s", magic, CHECK); // Version numbers _minor_version = stream->get_u2_fast(); _major_version = stream->get_u2_fast(); // Check version numbers - we check this even with verifier off verify_class_version(_major_version, _minor_version, _class_name, CHECK); stream->guarantee_more(3, CHECK); // length, first cp tag u2 cp_size = stream->get_u2_fast(); guarantee_property( cp_size >= 1, "Illegal constant pool size %u in class file %s", cp_size, CHECK); _orig_cp_size = cp_size; if (is_hidden()) { // Add a slot for hidden class name. cp_size++; } _cp = ConstantPool::allocate(_loader_data, cp_size, CHECK); ConstantPool* const cp = _cp; parse_constant_pool(stream, cp, _orig_cp_size, CHECK); assert(cp_size == (u2)cp->length(), "invariant"); // ACCESS FLAGS stream->guarantee_more(8, CHECK); // flags, this_class, super_class, infs_len // Access flags jint flags; // JVM_ACC_MODULE is defined in JDK-9 and later. if (_major_version >= JAVA_9_VERSION) { flags = stream->get_u2_fast() & (JVM_RECOGNIZED_CLASS_MODIFIERS | JVM_ACC_MODULE); } else { flags = stream->get_u2_fast() & JVM_RECOGNIZED_CLASS_MODIFIERS; } if ((flags & JVM_ACC_INTERFACE) && _major_version < JAVA_6_VERSION) { // Set abstract bit for old class files for backward compatibility flags |= JVM_ACC_ABSTRACT; } verify_legal_class_modifiers(flags, CHECK); short bad_constant = class_bad_constant_seen(); if (bad_constant != 0) { // Do not throw CFE until after the access_flags are checked because if // ACC_MODULE is set in the access flags, then NCDFE must be thrown, not CFE. classfile_parse_error("Unknown constant tag %u in class file %s", bad_constant, THREAD); return; } _access_flags.set_flags(flags); // This class and superclass _this_class_index = stream->get_u2_fast(); guarantee_property( valid_cp_range(_this_class_index, cp_size) && cp->tag_at(_this_class_index).is_unresolved_klass(), "Invalid this class index %u in constant pool in class file %s", _this_class_index, CHECK); Symbol* const class_name_in_cp = cp->klass_name_at(_this_class_index); assert(class_name_in_cp != nullptr, "class_name can't be null"); // Don't need to check whether this class name is legal or not. // It has been checked when constant pool is parsed. // However, make sure it is not an array type. if (_need_verify) { guarantee_property(class_name_in_cp->char_at(0) != JVM_SIGNATURE_ARRAY, "Bad class name in class file %s", CHECK); } #ifdef ASSERT // Basic sanity checks if (_is_hidden) { assert(_class_name != vmSymbols::unknown_class_name(), "hidden classes should have a special name"); } #endif // Update the _class_name as needed depending on whether this is a named, un-named, or hidden class. if (_is_hidden) { assert(_class_name != nullptr, "Unexpected null _class_name"); #ifdef ASSERT if (_need_verify) { verify_legal_class_name(_class_name, CHECK); } #endif } else { // Check if name in class file matches given name if (_class_name != class_name_in_cp) { if (_class_name != vmSymbols::unknown_class_name()) { ResourceMark rm(THREAD); Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_NoClassDefFoundError(), "%s (wrong name: %s)", _class_name->as_C_string(), class_name_in_cp->as_C_string() ); return; } else { // The class name was not known by the caller so we set it from // the value in the CP. update_class_name(class_name_in_cp); } // else nothing to do: the expected class name matches what is in the CP } } // Verification prevents us from creating names with dots in them, this // asserts that that's the case. assert(is_internal_format(_class_name), "external class name format used internally"); if (!is_internal()) { LogTarget(Debug, class, preorder) lt; if (lt.is_enabled()){ ResourceMark rm(THREAD); LogStream ls(lt); ls.print("%s", _class_name->as_klass_external_name()); if (stream->source() != nullptr) { ls.print(" source: %s", stream->source()); } ls.cr(); } } // SUPERKLASS _super_class_index = stream->get_u2_fast(); _super_klass = parse_super_class(cp, _super_class_index, _need_verify, CHECK); // Interfaces _itfs_len = stream->get_u2_fast(); parse_interfaces(stream, _itfs_len, cp, &_has_nonstatic_concrete_methods, CHECK); assert(_local_interfaces != nullptr, "invariant"); // Fields (offsets are filled in later) parse_fields(stream, _access_flags.is_interface(), cp, cp_size, &_java_fields_count, CHECK); assert(_temp_field_info != nullptr, "invariant"); // Methods parse_methods(stream, _access_flags.is_interface(), &_has_localvariable_table, &_has_final_method, &_declares_nonstatic_concrete_methods, CHECK); assert(_methods != nullptr, "invariant"); if (_declares_nonstatic_concrete_methods) { _has_nonstatic_concrete_methods = true; } // Additional attributes/annotations _parsed_annotations = new ClassAnnotationCollector(); parse_classfile_attributes(stream, cp, _parsed_annotations, CHECK); assert(_inner_classes != nullptr, "invariant"); // Finalize the Annotations metadata object, // now that all annotation arrays have been created. create_combined_annotations(CHECK); // Make sure this is the end of class file stream guarantee_property(stream->at_eos(), "Extra bytes at the end of class file %s", CHECK); // all bytes in stream read and parsed } void ClassFileParser::mangle_hidden_class_name(InstanceKlass* const ik) { ResourceMark rm; // Construct hidden name from _class_name, "+", and &ik. Note that we can't // use a '/' because that confuses finding the class's package. Also, can't // use an illegal char such as ';' because that causes serialization issues // and issues with hidden classes that create their own hidden classes. char addr_buf[20]; if (CDSConfig::is_dumping_static_archive()) { // We want stable names for the archived hidden classes (only for static // archive for now). Spaces under default_SharedBaseAddress() will be // occupied by the archive at run time, so we know that no dynamically // loaded InstanceKlass will be placed under there. static volatile size_t counter = 0; Atomic::cmpxchg(&counter, (size_t)0, Arguments::default_SharedBaseAddress()); // initialize it size_t new_id = Atomic::add(&counter, (size_t)1); jio_snprintf(addr_buf, 20, SIZE_FORMAT_X, new_id); } else { jio_snprintf(addr_buf, 20, INTPTR_FORMAT, p2i(ik)); } size_t new_name_len = _class_name->utf8_length() + 2 + strlen(addr_buf); char* new_name = NEW_RESOURCE_ARRAY(char, new_name_len); jio_snprintf(new_name, new_name_len, "%s+%s", _class_name->as_C_string(), addr_buf); update_class_name(SymbolTable::new_symbol(new_name)); // Add a Utf8 entry containing the hidden name. assert(_class_name != nullptr, "Unexpected null _class_name"); int hidden_index = _orig_cp_size; // this is an extra slot we added _cp->symbol_at_put(hidden_index, _class_name); // Update this_class_index's slot in the constant pool with the new Utf8 entry. // We have to update the resolved_klass_index and the name_index together // so extract the existing resolved_klass_index first. CPKlassSlot cp_klass_slot = _cp->klass_slot_at(_this_class_index); int resolved_klass_index = cp_klass_slot.resolved_klass_index(); _cp->unresolved_klass_at_put(_this_class_index, hidden_index, resolved_klass_index); assert(_cp->klass_slot_at(_this_class_index).name_index() == _orig_cp_size, "Bad name_index"); } void ClassFileParser::post_process_parsed_stream(const ClassFileStream* const stream, ConstantPool* cp, TRAPS) { assert(stream != nullptr, "invariant"); assert(stream->at_eos(), "invariant"); assert(cp != nullptr, "invariant"); assert(_loader_data != nullptr, "invariant"); if (_class_name == vmSymbols::java_lang_Object()) { guarantee_property(_local_interfaces == Universe::the_empty_instance_klass_array(), "java.lang.Object cannot implement an interface in class file %s", CHECK); } // We check super class after class file is parsed and format is checked if (_super_class_index > 0 && nullptr == _super_klass) { Symbol* const super_class_name = cp->klass_name_at(_super_class_index); if (_access_flags.is_interface()) { // Before attempting to resolve the superclass, check for class format // errors not checked yet. guarantee_property(super_class_name == vmSymbols::java_lang_Object(), "Interfaces must have java.lang.Object as superclass in class file %s", CHECK); } Handle loader(THREAD, _loader_data->class_loader()); if (loader.is_null() && super_class_name == vmSymbols::java_lang_Object()) { _super_klass = vmClasses::Object_klass(); } else { _super_klass = (const InstanceKlass*) SystemDictionary::resolve_super_or_fail(_class_name, super_class_name, loader, true, CHECK); } } if (_super_klass != nullptr) { if (_super_klass->has_nonstatic_concrete_methods()) { _has_nonstatic_concrete_methods = true; } if (_super_klass->is_interface()) { classfile_icce_error("class %s has interface %s as super class", _super_klass, THREAD); return; } } // Compute the transitive list of all unique interfaces implemented by this class _transitive_interfaces = compute_transitive_interfaces(_super_klass, _local_interfaces, _loader_data, CHECK); assert(_transitive_interfaces != nullptr, "invariant"); // sort methods _method_ordering = sort_methods(_methods); _all_mirandas = new GrowableArray(20); Handle loader(THREAD, _loader_data->class_loader()); klassVtable::compute_vtable_size_and_num_mirandas(&_vtable_size, &_num_miranda_methods, _all_mirandas, _super_klass, _methods, _access_flags, _major_version, loader, _class_name, _local_interfaces); // Size of Java itable (in words) _itable_size = _access_flags.is_interface() ? 0 : klassItable::compute_itable_size(_transitive_interfaces); assert(_parsed_annotations != nullptr, "invariant"); _field_info = new FieldLayoutInfo(); FieldLayoutBuilder lb(class_name(), super_klass(), _cp, /*_fields*/ _temp_field_info, _parsed_annotations->is_contended(), _field_info); lb.build_layout(); int injected_fields_count = _temp_field_info->length() - _java_fields_count; _fieldinfo_stream = FieldInfoStream::create_FieldInfoStream(_temp_field_info, _java_fields_count, injected_fields_count, loader_data(), CHECK); _fields_status = MetadataFactory::new_array(_loader_data, _temp_field_info->length(), FieldStatus(0), CHECK); } void ClassFileParser::set_klass(InstanceKlass* klass) { #ifdef ASSERT if (klass != nullptr) { assert(nullptr == _klass, "leaking?"); } #endif _klass = klass; } void ClassFileParser::set_klass_to_deallocate(InstanceKlass* klass) { #ifdef ASSERT if (klass != nullptr) { assert(nullptr == _klass_to_deallocate, "leaking?"); } #endif _klass_to_deallocate = klass; } // Caller responsible for ResourceMark // clone stream with rewound position const ClassFileStream* ClassFileParser::clone_stream() const { assert(_stream != nullptr, "invariant"); return _stream->clone(); } ReferenceType ClassFileParser::super_reference_type() const { return _super_klass == nullptr ? REF_NONE : _super_klass->reference_type(); } bool ClassFileParser::is_instance_ref_klass() const { // Only the subclasses of j.l.r.Reference are InstanceRefKlass. // j.l.r.Reference itself is InstanceKlass because InstanceRefKlass denotes a // klass requiring special treatment in ref-processing. The abstract // j.l.r.Reference cannot be instantiated so doesn't partake in // ref-processing. return is_java_lang_ref_Reference_subclass(); } bool ClassFileParser::is_java_lang_ref_Reference_subclass() const { if (_super_klass == nullptr) { return false; } if (_super_klass->name() == vmSymbols::java_lang_ref_Reference()) { // Direct subclass of j.l.r.Reference: Soft|Weak|Final|Phantom return true; } return _super_klass->reference_type() != REF_NONE; } // Returns true if the future Klass will need to be addressable with a narrow Klass ID. bool ClassFileParser::klass_needs_narrow_id() const { // Classes that are never instantiated need no narrow Klass Id, since the // only point of having a narrow id is to put it into an object header. Keeping // never instantiated classes out of class space lessens the class space pressure. // For more details, see JDK-8338526. return !is_interface() && !is_abstract(); } // ---------------------------------------------------------------------------- // debugging #ifdef ASSERT // return true if class_name contains no '.' (internal format is '/') bool ClassFileParser::is_internal_format(Symbol* class_name) { if (class_name != nullptr) { ResourceMark rm; char* name = class_name->as_C_string(); return strchr(name, JVM_SIGNATURE_DOT) == nullptr; } else { return true; } } #endif