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JSContextRef.cpp
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460 lines (386 loc) · 13.2 KB
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/*
* Copyright (C) 2006-2019 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "JSContextRef.h"
#include "JSContextRefInternal.h"
#include "APICast.h"
#include "CallFrame.h"
#include "InitializeThreading.h"
#include "JSAPIGlobalObject.h"
#include "JSAPIWrapperObject.h"
#include "JSCallbackObject.h"
#include "JSClassRef.h"
#include "JSObjectInlines.h"
#include "StackVisitor.h"
#include "StrongInlines.h"
#include "StructureInlines.h"
#include "Watchdog.h"
#include <wtf/text/StringBuilder.h>
#if ENABLE(REMOTE_INSPECTOR)
#include "JSGlobalObjectDebuggable.h"
#include "JSGlobalObjectInspectorController.h"
#include "JSRemoteInspector.h"
#endif
#if ENABLE(INSPECTOR_ALTERNATE_DISPATCHERS)
#include "JSContextRefInspectorSupport.h"
#endif
#if OS(DARWIN)
#include <mach-o/dyld.h>
static constexpr int32_t webkitFirstVersionWithConcurrentGlobalContexts = 0x2100500; // 528.5.0
#endif
using namespace JSC;
// From the API's perspective, a context group remains alive iff
// (a) it has been JSContextGroupRetained
// OR
// (b) one of its contexts has been JSContextRetained
JSContextGroupRef JSContextGroupCreate()
{
JSC::initialize();
return toRef(&VM::createContextGroup().leakRef());
}
JSContextGroupRef JSContextGroupRetain(JSContextGroupRef group)
{
toJS(group)->ref();
return group;
}
void JSContextGroupRelease(JSContextGroupRef group)
{
VM& vm = *toJS(group);
JSLockHolder locker(&vm);
vm.deref();
}
static bool internalScriptTimeoutCallback(JSGlobalObject* globalObject, void* callbackPtr, void* callbackData)
{
JSShouldTerminateCallback callback = reinterpret_cast<JSShouldTerminateCallback>(callbackPtr);
JSContextRef contextRef = toRef(globalObject);
ASSERT(callback);
return callback(contextRef, callbackData);
}
void JSContextGroupSetExecutionTimeLimit(JSContextGroupRef group, double limit, JSShouldTerminateCallback callback, void* callbackData)
{
VM& vm = *toJS(group);
JSLockHolder locker(&vm);
Watchdog& watchdog = vm.ensureWatchdog();
if (callback) {
void* callbackPtr = reinterpret_cast<void*>(callback);
watchdog.setTimeLimit(Seconds { limit }, internalScriptTimeoutCallback, callbackPtr, callbackData);
} else
watchdog.setTimeLimit(Seconds { limit });
}
void JSContextGroupClearExecutionTimeLimit(JSContextGroupRef group)
{
VM& vm = *toJS(group);
JSLockHolder locker(&vm);
if (vm.watchdog())
vm.watchdog()->setTimeLimit(Watchdog::noTimeLimit);
}
// From the API's perspective, a global context remains alive iff it has been JSGlobalContextRetained.
JSGlobalContextRef JSGlobalContextCreate(JSClassRef globalObjectClass)
{
JSC::initialize();
#if OS(DARWIN)
// If the application was linked before JSGlobalContextCreate was changed to use a unique VM,
// we use a shared one for backwards compatibility.
if (NSVersionOfLinkTimeLibrary("JavaScriptCore") <= webkitFirstVersionWithConcurrentGlobalContexts) {
return JSGlobalContextCreateInGroup(toRef(&VM::sharedInstance()), globalObjectClass);
}
#endif // OS(DARWIN)
return JSGlobalContextCreateInGroup(nullptr, globalObjectClass);
}
JSGlobalContextRef JSGlobalContextCreateInGroup(JSContextGroupRef group, JSClassRef globalObjectClass)
{
JSC::initialize();
Ref<VM> vm = group ? Ref<VM>(*toJS(group)) : VM::createContextGroup();
JSLockHolder locker(vm.ptr());
if (!globalObjectClass) {
JSGlobalObject* globalObject = JSAPIGlobalObject::create(vm.get(), JSAPIGlobalObject::createStructure(vm.get(), jsNull()));
#if ENABLE(REMOTE_INSPECTOR)
if (JSRemoteInspectorGetInspectionEnabledByDefault())
globalObject->setRemoteDebuggingEnabled(true);
#endif
return JSGlobalContextRetain(toGlobalRef(globalObject));
}
JSGlobalObject* globalObject = JSCallbackObject<JSGlobalObject>::create(vm.get(), globalObjectClass, JSCallbackObject<JSGlobalObject>::createStructure(vm.get(), nullptr, jsNull()));
JSValue prototype = globalObjectClass->prototype(globalObject);
if (!prototype)
prototype = jsNull();
globalObject->resetPrototype(vm.get(), prototype);
#if ENABLE(REMOTE_INSPECTOR)
if (JSRemoteInspectorGetInspectionEnabledByDefault())
globalObject->setRemoteDebuggingEnabled(true);
#endif
return JSGlobalContextRetain(toGlobalRef(globalObject));
}
JSGlobalContextRef JSGlobalContextRetain(JSGlobalContextRef ctx)
{
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder locker(vm);
gcProtect(globalObject);
vm.ref();
return ctx;
}
void JSGlobalContextRelease(JSGlobalContextRef ctx)
{
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder locker(vm);
bool protectCountIsZero = vm.heap.unprotect(globalObject);
if (protectCountIsZero)
vm.heap.reportAbandonedObjectGraph();
vm.deref();
}
JSObjectRef JSContextGetGlobalObject(JSContextRef ctx)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return nullptr;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder locker(vm);
return toRef(jsCast<JSObject*>(globalObject->methodTable(vm)->toThis(globalObject, globalObject, ECMAMode::sloppy())));
}
JSContextGroupRef JSContextGetGroup(JSContextRef ctx)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return nullptr;
}
JSGlobalObject* globalObject = toJS(ctx);
return toRef(&globalObject->vm());
}
JSGlobalContextRef JSContextGetGlobalContext(JSContextRef ctx)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return nullptr;
}
JSGlobalObject* globalObject = toJS(ctx);
JSLockHolder locker(globalObject);
return toGlobalRef(globalObject);
}
JSStringRef JSGlobalContextCopyName(JSGlobalContextRef ctx)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return nullptr;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder locker(vm);
String name = globalObject->name();
if (name.isNull())
return nullptr;
return OpaqueJSString::tryCreate(name).leakRef();
}
void JSGlobalContextSetName(JSGlobalContextRef ctx, JSStringRef name)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder locker(vm);
globalObject->setName(name ? name->string() : String());
}
void JSGlobalContextSetUnhandledRejectionCallback(JSGlobalContextRef ctx, JSObjectRef function, JSValueRef* exception)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder locker(vm);
JSObject* object = toJS(function);
if (!object->isCallable(vm)) {
*exception = toRef(createTypeError(globalObject));
return;
}
globalObject->setUnhandledRejectionCallback(vm, object);
}
class BacktraceFunctor {
public:
BacktraceFunctor(StringBuilder& builder, unsigned remainingCapacityForFrameCapture)
: m_builder(builder)
, m_remainingCapacityForFrameCapture(remainingCapacityForFrameCapture)
{
}
StackVisitor::Status operator()(StackVisitor& visitor) const
{
if (m_remainingCapacityForFrameCapture) {
// If callee is unknown, but we've not added any frame yet, we should
// still add the frame, because something called us, and gave us arguments.
if (visitor->callee().isCell()) {
JSCell* callee = visitor->callee().asCell();
if (!callee && visitor->index())
return StackVisitor::Done;
}
StringBuilder& builder = m_builder;
if (!builder.isEmpty())
builder.append('\n');
builder.append('#');
builder.appendNumber(visitor->index());
builder.append(' ');
builder.append(visitor->functionName());
builder.appendLiteral("() at ");
builder.append(visitor->sourceURL());
if (visitor->hasLineAndColumnInfo()) {
builder.append(':');
unsigned lineNumber;
unsigned unusedColumn;
visitor->computeLineAndColumn(lineNumber, unusedColumn);
builder.appendNumber(lineNumber);
}
if (!visitor->callee().rawPtr())
return StackVisitor::Done;
m_remainingCapacityForFrameCapture--;
return StackVisitor::Continue;
}
return StackVisitor::Done;
}
private:
StringBuilder& m_builder;
mutable unsigned m_remainingCapacityForFrameCapture;
};
JSStringRef JSContextCreateBacktrace(JSContextRef ctx, unsigned maxStackSize)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return nullptr;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder lock(vm);
StringBuilder builder;
CallFrame* frame = vm.topCallFrame;
ASSERT(maxStackSize);
BacktraceFunctor functor(builder, maxStackSize);
frame->iterate(vm, functor);
return OpaqueJSString::tryCreate(builder.toString()).leakRef();
}
bool JSGlobalContextGetRemoteInspectionEnabled(JSGlobalContextRef ctx)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return false;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder lock(vm);
return globalObject->remoteDebuggingEnabled();
}
void JSGlobalContextSetRemoteInspectionEnabled(JSGlobalContextRef ctx, bool enabled)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder lock(vm);
globalObject->setRemoteDebuggingEnabled(enabled);
}
bool JSGlobalContextGetIncludesNativeCallStackWhenReportingExceptions(JSGlobalContextRef ctx)
{
#if ENABLE(REMOTE_INSPECTOR)
if (!ctx) {
ASSERT_NOT_REACHED();
return false;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder lock(vm);
return globalObject->inspectorController().includesNativeCallStackWhenReportingExceptions();
#else
UNUSED_PARAM(ctx);
return false;
#endif
}
void JSGlobalContextSetIncludesNativeCallStackWhenReportingExceptions(JSGlobalContextRef ctx, bool includesNativeCallStack)
{
#if ENABLE(REMOTE_INSPECTOR)
if (!ctx) {
ASSERT_NOT_REACHED();
return;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder lock(vm);
globalObject->inspectorController().setIncludesNativeCallStackWhenReportingExceptions(includesNativeCallStack);
#else
UNUSED_PARAM(ctx);
UNUSED_PARAM(includesNativeCallStack);
#endif
}
#if USE(CF)
CFRunLoopRef JSGlobalContextGetDebuggerRunLoop(JSGlobalContextRef ctx)
{
#if ENABLE(REMOTE_INSPECTOR)
if (!ctx) {
ASSERT_NOT_REACHED();
return nullptr;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder lock(vm);
return globalObject->inspectorDebuggable().targetRunLoop();
#else
UNUSED_PARAM(ctx);
return nullptr;
#endif
}
void JSGlobalContextSetDebuggerRunLoop(JSGlobalContextRef ctx, CFRunLoopRef runLoop)
{
#if ENABLE(REMOTE_INSPECTOR)
if (!ctx) {
ASSERT_NOT_REACHED();
return;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder lock(vm);
globalObject->inspectorDebuggable().setTargetRunLoop(runLoop);
#else
UNUSED_PARAM(ctx);
UNUSED_PARAM(runLoop);
#endif
}
#endif // USE(CF)
#if ENABLE(INSPECTOR_ALTERNATE_DISPATCHERS)
Inspector::AugmentableInspectorController* JSGlobalContextGetAugmentableInspectorController(JSGlobalContextRef ctx)
{
if (!ctx) {
ASSERT_NOT_REACHED();
return nullptr;
}
JSGlobalObject* globalObject = toJS(ctx);
VM& vm = globalObject->vm();
JSLockHolder lock(vm);
return &globalObject->inspectorController();
}
#endif