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/* -*- 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
*
*
* 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