/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: set ts=8 sts=2 et sw=2 tw=80:
 *
 * Copyright 2025 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "wasm/WasmContext.h"

#include "js/friend/StackLimits.h"
#include "vm/JSContext.h"

using namespace js::wasm;

Context::Context()
    : triedToInstallSignalHandlers(false),
      haveSignalHandlers(false),
      stackLimit(JS::NativeStackLimitMin)
#ifdef ENABLE_WASM_JSPI
      ,
      onSuspendableStack(0),
      suspendableStacksCount(0)
#endif
{
}

void Context::initStackLimit(JSContext* cx) {
  // The wasm stack limit is the same as the jit stack limit. We also don't
  // use the stack limit for triggering interrupts.
  stackLimit = cx->jitStackLimitNoInterrupt;
}

#ifdef ENABLE_WASM_JSPI
void Context::enterSuspendableStack(JS::NativeStackLimit newStackLimit) {
  MOZ_ASSERT(onSuspendableStack == 0);
  onSuspendableStack = 1;
  stackLimit = newStackLimit;
}

void Context::leaveSuspendableStack(JSContext* cx) {
  MOZ_ASSERT(onSuspendableStack != 0);
  onSuspendableStack = 0;
  initStackLimit(cx);
}
#endif

#ifdef ENABLE_WASM_JSPI
bool js::IsSuspendableStackActive(JSContext* cx) {
  return cx->wasm().onSuspendableStack != 0;
}

JS::NativeStackLimit js::GetSuspendableStackLimit(JSContext* cx) {
  MOZ_ASSERT(IsSuspendableStackActive(cx));
  return cx->wasm().stackLimit;
}
#endif