C++ HandleScript::function方法代码示例

bool
SPSExit(JSContext *cx, HandleScript script)
{
    cx->runtime()->spsProfiler.exit(cx, script, script->function());
    return true;
}

bool
js::DirectEvalFromIon(JSContext *cx,
                      HandleObject scopeobj, HandleScript callerScript,
                      HandleValue thisValue, HandleString str,
                      MutableHandleValue vp)
{
    AssertInnerizedScopeChain(cx, *scopeobj);

    Rooted<GlobalObject*> scopeObjGlobal(cx, &scopeobj->global());
    if (!GlobalObject::isRuntimeCodeGenEnabled(cx, scopeObjGlobal)) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, NULL, JSMSG_CSP_BLOCKED_EVAL);
        return false;
    }

    // ES5 15.1.2.1 steps 2-8.

    unsigned staticLevel = callerScript->staticLevel + 1;

    Rooted<JSStableString*> stableStr(cx, str->ensureStable(cx));
    if (!stableStr)
        return false;

    StableCharPtr chars = stableStr->chars();
    size_t length = stableStr->length();

    EvalJSONResult ejr = TryEvalJSON(cx, callerScript, chars, length, vp);
    if (ejr != EvalJSON_NotJSON)
        return ejr == EvalJSON_Success;

    EvalScriptGuard esg(cx);

    // Ion will not perform cross compartment direct eval calls.
    JSPrincipals *principals = cx->compartment->principals;

    esg.lookupInEvalCache(stableStr, callerScript->function(), staticLevel);

    if (!esg.foundScript()) {
        unsigned lineno;
        const char *filename;
        JSPrincipals *originPrincipals;
        CurrentScriptFileLineOrigin(cx, &filename, &lineno, &originPrincipals,
                                    CALLED_FROM_JSOP_EVAL);

        CompileOptions options(cx);
        options.setFileAndLine(filename, lineno)
               .setCompileAndGo(true)
               .setNoScriptRval(false)
               .setPrincipals(principals)
               .setOriginPrincipals(originPrincipals);
        UnrootedScript compiled = frontend::CompileScript(cx, scopeobj, callerScript, options,
                                                          chars.get(), length, stableStr, staticLevel);
        if (!compiled)
            return false;

        esg.setNewScript(compiled);
    }

    // Primitive 'this' values should have been filtered out by Ion. If boxed,
    // the calling frame cannot be updated to store the new object.
    JS_ASSERT(thisValue.isObject() || thisValue.isUndefined() || thisValue.isNull());

    return ExecuteKernel(cx, esg.script(), *scopeobj, thisValue, ExecuteType(DIRECT_EVAL),
                         NullFramePtr() /* evalInFrame */, vp.address());
}

RawScript
frontend::CompileScript(JSContext *cx, HandleObject scopeChain,
                        HandleScript evalCaller,
                        const CompileOptions &options,
                        const jschar *chars, size_t length,
                        JSString *source_ /* = NULL */,
                        unsigned staticLevel /* = 0 */,
                        SourceCompressionToken *extraSct /* = NULL */)
{
    RootedString source(cx, source_);

    /*
     * The scripted callerFrame can only be given for compile-and-go scripts
     * and non-zero static level requires callerFrame.
     */
    JS_ASSERT_IF(evalCaller, options.compileAndGo);
    JS_ASSERT_IF(staticLevel != 0, evalCaller);

    if (!CheckLength(cx, length))
        return NULL;
    JS_ASSERT_IF(staticLevel != 0, options.sourcePolicy != CompileOptions::LAZY_SOURCE);
    ScriptSource *ss = cx->new_<ScriptSource>();
    if (!ss)
        return NULL;
    if (options.filename && !ss->setFilename(cx, options.filename))
        return NULL;
    ScriptSourceHolder ssh(ss);
    SourceCompressionToken mysct(cx);
    SourceCompressionToken *sct = (extraSct) ? extraSct : &mysct;
    switch (options.sourcePolicy) {
      case CompileOptions::SAVE_SOURCE:
        if (!ss->setSourceCopy(cx, chars, length, false, sct))
            return NULL;
        break;
      case CompileOptions::LAZY_SOURCE:
        ss->setSourceRetrievable();
        break;
      case CompileOptions::NO_SOURCE:
        break;
    }

    Parser<FullParseHandler> parser(cx, options, chars, length, /* foldConstants = */ true);
    if (!parser.init())
        return NULL;
    parser.sct = sct;

    GlobalSharedContext globalsc(cx, scopeChain, StrictModeFromContext(cx));

    ParseContext<FullParseHandler> pc(&parser, NULL, &globalsc, staticLevel, /* bodyid = */ 0);
    if (!pc.init())
        return NULL;

    bool savedCallerFun =
        options.compileAndGo &&
        evalCaller &&
        (evalCaller->function() || evalCaller->savedCallerFun);
    Rooted<JSScript*> script(cx, JSScript::Create(cx, NullPtr(), savedCallerFun,
                                                  options, staticLevel, ss, 0, length));
    if (!script)
        return NULL;

    // Global/eval script bindings are always empty (all names are added to the
    // scope dynamically via JSOP_DEFFUN/VAR).
    InternalHandle<Bindings*> bindings(script, &script->bindings);
    if (!Bindings::initWithTemporaryStorage(cx, bindings, 0, 0, NULL))
        return NULL;

    // We can specialize a bit for the given scope chain if that scope chain is the global object.
    JSObject *globalScope = scopeChain && scopeChain == &scopeChain->global() ? (JSObject*) scopeChain : NULL;
    JS_ASSERT_IF(globalScope, globalScope->isNative());
    JS_ASSERT_IF(globalScope, JSCLASS_HAS_GLOBAL_FLAG_AND_SLOTS(globalScope->getClass()));

    BytecodeEmitter bce(/* parent = */ NULL, &parser, &globalsc, script, evalCaller, !!globalScope,
                        options.lineno, options.selfHostingMode);
    if (!bce.init())
        return NULL;

    /* If this is a direct call to eval, inherit the caller's strictness.  */
    if (evalCaller && evalCaller->strict)
        globalsc.strict = true;

    if (options.compileAndGo) {
        if (source) {
            /*
             * Save eval program source in script->atoms[0] for the
             * eval cache (see EvalCacheLookup in jsobj.cpp).
             */
            JSAtom *atom = AtomizeString<CanGC>(cx, source);
            jsatomid _;
            if (!atom || !bce.makeAtomIndex(atom, &_))
                return NULL;
        }

        if (evalCaller && evalCaller->functionOrCallerFunction()) {
            /*
             * An eval script in a caller frame needs to have its enclosing
             * function captured in case it refers to an upvar, and someone
             * wishes to decompile it while it's running.
             */
            JSFunction *fun = evalCaller->functionOrCallerFunction();
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