mirror of
https://github.com/classilla/tenfourfox.git
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220 lines
7.3 KiB
C
220 lines
7.3 KiB
C
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsJSUtils_h__
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#define nsJSUtils_h__
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/**
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* This is not a generated file. It contains common utility functions
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* invoked from the JavaScript code generated from IDL interfaces.
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* The goal of the utility functions is to cut down on the size of
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* the generated code itself.
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*/
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#include "mozilla/Assertions.h"
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#include "jsapi.h"
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#include "jsfriendapi.h"
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#include "js/Conversions.h"
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#include "nsString.h"
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class nsIScriptContext;
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class nsIScriptGlobalObject;
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namespace mozilla {
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namespace dom {
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class AutoJSAPI;
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class Element;
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} // namespace dom
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} // namespace mozilla
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class nsJSUtils
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{
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public:
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static bool GetCallingLocation(JSContext* aContext, nsACString& aFilename,
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uint32_t* aLineno = nullptr,
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uint32_t* aColumn = nullptr);
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static bool GetCallingLocation(JSContext* aContext, nsAString& aFilename,
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uint32_t* aLineno = nullptr,
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uint32_t* aColumn = nullptr);
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static nsIScriptGlobalObject *GetStaticScriptGlobal(JSObject* aObj);
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static nsIScriptContext *GetStaticScriptContext(JSObject* aObj);
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/**
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* Retrieve the inner window ID based on the given JSContext.
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*
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* @param JSContext aContext
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* The JSContext from which you want to find the inner window ID.
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*
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* @returns uint64_t the inner window ID.
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*/
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static uint64_t GetCurrentlyRunningCodeInnerWindowID(JSContext *aContext);
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static nsresult CompileFunction(mozilla::dom::AutoJSAPI& jsapi,
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JS::AutoObjectVector& aScopeChain,
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JS::CompileOptions& aOptions,
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const nsACString& aName,
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uint32_t aArgCount,
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const char** aArgArray,
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const nsAString& aBody,
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JSObject** aFunctionObject);
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struct MOZ_STACK_CLASS EvaluateOptions {
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bool coerceToString;
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JS::AutoObjectVector scopeChain;
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explicit EvaluateOptions(JSContext* cx)
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: coerceToString(false)
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, scopeChain(cx)
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{}
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EvaluateOptions& setCoerceToString(bool aCoerce) {
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coerceToString = aCoerce;
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return *this;
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}
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};
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// aEvaluationGlobal is the global to evaluate in. The return value
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// will then be wrapped back into the compartment aCx is in when
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// this function is called. For all the EvaluateString overloads,
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// the JSContext must come from an AutoJSAPI that has had
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// TakeOwnershipOfErrorReporting() called on it.
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static nsresult EvaluateString(JSContext* aCx,
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const nsAString& aScript,
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JS::Handle<JSObject*> aEvaluationGlobal,
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JS::CompileOptions &aCompileOptions,
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const EvaluateOptions& aEvaluateOptions,
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JS::MutableHandle<JS::Value> aRetValue);
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static nsresult EvaluateString(JSContext* aCx,
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JS::SourceBufferHolder& aSrcBuf,
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JS::Handle<JSObject*> aEvaluationGlobal,
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JS::CompileOptions &aCompileOptions,
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const EvaluateOptions& aEvaluateOptions,
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JS::MutableHandle<JS::Value> aRetValue);
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static nsresult EvaluateString(JSContext* aCx,
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const nsAString& aScript,
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JS::Handle<JSObject*> aEvaluationGlobal,
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JS::CompileOptions &aCompileOptions);
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static nsresult EvaluateString(JSContext* aCx,
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JS::SourceBufferHolder& aSrcBuf,
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JS::Handle<JSObject*> aEvaluationGlobal,
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JS::CompileOptions &aCompileOptions,
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void **aOffThreadToken);
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// Returns false if an exception got thrown on aCx. Passing a null
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// aElement is allowed; that wil produce an empty aScopeChain.
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static bool GetScopeChainForElement(JSContext* aCx,
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mozilla::dom::Element* aElement,
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JS::AutoObjectVector& aScopeChain);
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static void ResetTimeZone();
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private:
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// Implementation for our EvaluateString bits
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static nsresult EvaluateString(JSContext* aCx,
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JS::SourceBufferHolder& aSrcBuf,
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JS::Handle<JSObject*> aEvaluationGlobal,
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JS::CompileOptions& aCompileOptions,
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const EvaluateOptions& aEvaluateOptions,
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JS::MutableHandle<JS::Value> aRetValue,
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void **aOffThreadToken);
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};
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class MOZ_STACK_CLASS AutoDontReportUncaught {
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JSContext* mContext;
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bool mWasSet;
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public:
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explicit AutoDontReportUncaught(JSContext* aContext) : mContext(aContext) {
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MOZ_ASSERT(aContext);
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mWasSet = JS::ContextOptionsRef(mContext).dontReportUncaught();
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if (!mWasSet) {
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JS::ContextOptionsRef(mContext).setDontReportUncaught(true);
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}
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}
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~AutoDontReportUncaught() {
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if (!mWasSet) {
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JS::ContextOptionsRef(mContext).setDontReportUncaught(false);
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}
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}
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};
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template<typename T>
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inline bool
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AssignJSString(JSContext *cx, T &dest, JSString *s)
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{
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size_t len = js::GetStringLength(s);
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static_assert(js::MaxStringLength < (1 << 28),
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"Shouldn't overflow here or in SetCapacity");
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if (MOZ_UNLIKELY(!dest.SetLength(len, mozilla::fallible))) {
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JS_ReportOutOfMemory(cx);
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return false;
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}
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return js::CopyStringChars(cx, dest.BeginWriting(), s, len);
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}
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inline void
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AssignJSFlatString(nsAString &dest, JSFlatString *s)
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{
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size_t len = js::GetFlatStringLength(s);
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static_assert(js::MaxStringLength < (1 << 28),
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"Shouldn't overflow here or in SetCapacity");
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dest.SetLength(len);
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js::CopyFlatStringChars(dest.BeginWriting(), s, len);
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}
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class nsAutoJSString : public nsAutoString
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{
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public:
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/**
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* nsAutoJSString should be default constructed, which leaves it empty
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* (this->IsEmpty()), and initialized with one of the init() methods below.
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*/
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nsAutoJSString() {}
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bool init(JSContext* aContext, JSString* str)
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{
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return AssignJSString(aContext, *this, str);
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}
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bool init(JSContext* aContext, const JS::Value &v)
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{
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if (v.isString()) {
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return init(aContext, v.toString());
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}
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// Stringify, making sure not to run script.
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JS::Rooted<JSString*> str(aContext);
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if (v.isObject()) {
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str = JS_NewStringCopyZ(aContext, "[Object]");
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} else {
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JS::Rooted<JS::Value> rootedVal(aContext, v);
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str = JS::ToString(aContext, rootedVal);
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}
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return str && init(aContext, str);
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}
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bool init(JSContext* aContext, jsid jid)
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{
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JS::Rooted<JS::Value> v(aContext);
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return JS_IdToValue(aContext, jid, &v) && init(aContext, v);
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}
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bool init(const JS::Value &v);
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~nsAutoJSString() {}
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};
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#endif /* nsJSUtils_h__ */
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