mozilla
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gecko-dev
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gecko-dev/dom/base/nsJSUtils.cpp

276 строки
8.8 KiB
C++
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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: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/**
* This is not a generated file. It contains common utility functions
* invoked from the JavaScript code generated from IDL interfaces.
* The goal of the utility functions is to cut down on the size of
* the generated code itself.
*/
#include "nsJSUtils.h"
#include <utility>
#include "MainThreadUtils.h"
#include "js/ComparisonOperators.h"
#include "js/CompilationAndEvaluation.h"
#include "js/CompileOptions.h"
#include "js/Date.h"
#include "js/GCVector.h"
#include "js/HeapAPI.h"
#include "js/Modules.h"
#include "js/RootingAPI.h"
#include "js/SourceText.h"
#include "js/TypeDecls.h"
#include "jsfriendapi.h"
#include "mozilla/CycleCollectedJSContext.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/fallible.h"
#include "mozilla/ProfilerLabels.h"
#include "nsContentUtils.h"
#include "nsDebug.h"
#include "nsGlobalWindowInner.h"
#include "nsINode.h"
#include "nsString.h"
#include "nsTPromiseFlatString.h"
#include "nscore.h"
#if !defined(DEBUG) && !defined(MOZ_ENABLE_JS_DUMP)
# include "mozilla/StaticPrefs_browser.h"
#endif
using namespace mozilla;
using namespace mozilla::dom;
bool nsJSUtils::GetCallingLocation(JSContext* aContext, nsACString& aFilename,
uint32_t* aLineno, uint32_t* aColumn) {
JS::AutoFilename filename;
if (!JS::DescribeScriptedCaller(aContext, &filename, aLineno, aColumn)) {
return false;
}
return aFilename.Assign(filename.get(), fallible);
}
bool nsJSUtils::GetCallingLocation(JSContext* aContext, nsAString& aFilename,
uint32_t* aLineno, uint32_t* aColumn) {
JS::AutoFilename filename;
if (!JS::DescribeScriptedCaller(aContext, &filename, aLineno, aColumn)) {
return false;
}
return aFilename.Assign(NS_ConvertUTF8toUTF16(filename.get()), fallible);
}
uint64_t nsJSUtils::GetCurrentlyRunningCodeInnerWindowID(JSContext* aContext) {
if (!aContext) return 0;
nsGlobalWindowInner* win = xpc::CurrentWindowOrNull(aContext);
return win ? win->WindowID() : 0;
}
nsresult nsJSUtils::UpdateFunctionDebugMetadata(
AutoJSAPI& jsapi, JS::Handle<JSObject*> aFun, JS::CompileOptions& aOptions,
JS::Handle<JSString*> aElementAttributeName,
JS::Handle<JS::Value> aPrivateValue) {
JSContext* cx = jsapi.cx();
JS::Rooted<JSFunction*> fun(cx, JS_GetObjectFunction(aFun));
if (!fun) {
return NS_ERROR_FAILURE;
}
JS::RootedScript script(cx, JS_GetFunctionScript(cx, fun));
if (!script) {
return NS_OK;
}
if (!JS::UpdateDebugMetadata(cx, script, aOptions, aPrivateValue,
aElementAttributeName, nullptr, nullptr)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult nsJSUtils::CompileFunction(AutoJSAPI& jsapi,
JS::HandleVector<JSObject*> aScopeChain,
JS::CompileOptions& aOptions,
const nsACString& aName, uint32_t aArgCount,
const char** aArgArray,
const nsAString& aBody,
JSObject** aFunctionObject) {
JSContext* cx = jsapi.cx();
MOZ_ASSERT(js::GetContextRealm(cx));
MOZ_ASSERT_IF(aScopeChain.length() != 0,
js::IsObjectInContextCompartment(aScopeChain[0], cx));
// Do the junk Gecko is supposed to do before calling into JSAPI.
for (size_t i = 0; i < aScopeChain.length(); ++i) {
JS::ExposeObjectToActiveJS(aScopeChain[i]);
}
// Compile.
const nsPromiseFlatString& flatBody = PromiseFlatString(aBody);
JS::SourceText<char16_t> source;
if (!source.init(cx, flatBody.get(), flatBody.Length(),
JS::SourceOwnership::Borrowed)) {
return NS_ERROR_FAILURE;
}
JS::Rooted<JSFunction*> fun(
cx, JS::CompileFunction(cx, aScopeChain, aOptions,
PromiseFlatCString(aName).get(), aArgCount,
aArgArray, source));
if (!fun) {
return NS_ERROR_FAILURE;
}
*aFunctionObject = JS_GetFunctionObject(fun);
return NS_OK;
}
template <typename Unit>
static nsresult CompileJSModule(JSContext* aCx, JS::SourceText<Unit>& aSrcBuf,
JS::Handle<JSObject*> aEvaluationGlobal,
JS::CompileOptions& aCompileOptions,
JS::MutableHandle<JSObject*> aModule) {
AUTO_PROFILER_LABEL("nsJSUtils::CompileModule", JS);
MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
MOZ_ASSERT(aSrcBuf.get());
MOZ_ASSERT(JS_IsGlobalObject(aEvaluationGlobal));
MOZ_ASSERT(JS::CurrentGlobalOrNull(aCx) == aEvaluationGlobal);
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(CycleCollectedJSContext::Get() &&
CycleCollectedJSContext::Get()->MicroTaskLevel());
NS_ENSURE_TRUE(xpc::Scriptability::Get(aEvaluationGlobal).Allowed(), NS_OK);
JSObject* module = JS::CompileModule(aCx, aCompileOptions, aSrcBuf);
if (!module) {
return NS_ERROR_FAILURE;
}
aModule.set(module);
return NS_OK;
}
nsresult nsJSUtils::CompileModule(JSContext* aCx,
JS::SourceText<char16_t>& aSrcBuf,
JS::Handle<JSObject*> aEvaluationGlobal,
JS::CompileOptions& aCompileOptions,
JS::MutableHandle<JSObject*> aModule) {
return CompileJSModule(aCx, aSrcBuf, aEvaluationGlobal, aCompileOptions,
aModule);
}
nsresult nsJSUtils::CompileModule(JSContext* aCx,
JS::SourceText<Utf8Unit>& aSrcBuf,
JS::Handle<JSObject*> aEvaluationGlobal,
JS::CompileOptions& aCompileOptions,
JS::MutableHandle<JSObject*> aModule) {
return CompileJSModule(aCx, aSrcBuf, aEvaluationGlobal, aCompileOptions,
aModule);
}
nsresult nsJSUtils::ModuleInstantiate(JSContext* aCx,
JS::Handle<JSObject*> aModule) {
AUTO_PROFILER_LABEL("nsJSUtils::ModuleInstantiate", JS);
MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(CycleCollectedJSContext::Get() &&
CycleCollectedJSContext::Get()->MicroTaskLevel());
NS_ENSURE_TRUE(xpc::Scriptability::Get(aModule).Allowed(), NS_OK);
if (!JS::ModuleInstantiate(aCx, aModule)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
nsresult nsJSUtils::ModuleEvaluate(JSContext* aCx,
JS::Handle<JSObject*> aModule,
JS::MutableHandle<JS::Value> aResult) {
AUTO_PROFILER_LABEL("nsJSUtils::ModuleEvaluate", JS);
MOZ_ASSERT(aCx == nsContentUtils::GetCurrentJSContext());
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(CycleCollectedJSContext::Get() &&
CycleCollectedJSContext::Get()->MicroTaskLevel());
NS_ENSURE_TRUE(xpc::Scriptability::Get(aModule).Allowed(), NS_OK);
if (!JS::ModuleEvaluate(aCx, aModule, aResult)) {
return NS_ERROR_FAILURE;
}
return NS_OK;
}
static bool AddScopeChainItem(JSContext* aCx, nsINode* aNode,
JS::MutableHandleVector<JSObject*> aScopeChain) {
JS::RootedValue val(aCx);
if (!GetOrCreateDOMReflector(aCx, aNode, &val)) {
return false;
}
if (!aScopeChain.append(&val.toObject())) {
return false;
}
return true;
}
/* static */
bool nsJSUtils::GetScopeChainForElement(
JSContext* aCx, Element* aElement,
JS::MutableHandleVector<JSObject*> aScopeChain) {
for (nsINode* cur = aElement; cur; cur = cur->GetScopeChainParent()) {
if (!AddScopeChainItem(aCx, cur, aScopeChain)) {
return false;
}
}
return true;
}
/* static */
void nsJSUtils::ResetTimeZone() { JS::ResetTimeZone(); }
/* static */
bool nsJSUtils::DumpEnabled() {
#if defined(DEBUG) || defined(MOZ_ENABLE_JS_DUMP)
return true;
#else
return StaticPrefs::browser_dom_window_dump_enabled();
#endif
}
//
// nsDOMJSUtils.h
//
template <typename T>
bool nsTAutoJSString<T>::init(const JS::Value& v) {
// Note: it's okay to use danger::GetJSContext here instead of AutoJSAPI,
// because the init() call below is careful not to run script (for instance,
// it only calls JS::ToString for non-object values).
JSContext* cx = danger::GetJSContext();
if (!init(cx, v)) {
JS_ClearPendingException(cx);
return false;
}
return true;
}
template bool nsTAutoJSString<char16_t>::init(const JS::Value&);
template bool nsTAutoJSString<char>::init(const JS::Value&);
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