示例#1
0
// ES6 rev 24 (2014 Apr 27) 19.4.1.1 and 19.4.1.2
bool
SymbolObject::construct(JSContext *cx, unsigned argc, Value *vp)
{
    // According to a note in the draft standard, "Symbol has ordinary
    // [[Construct]] behaviour but the definition of its @@create method causes
    // `new Symbol` to throw a TypeError exception." We do not support @@create
    // yet, so just throw a TypeError.
    CallArgs args = CallArgsFromVp(argc, vp);
    if (args.isConstructing()) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_CONSTRUCTOR, "Symbol");
        return false;
    }

    // steps 1-3
    RootedString desc(cx);
    if (!args.get(0).isUndefined()) {
        desc = ToString(cx, args.get(0));
        if (!desc)
            return false;
    }

    // step 4
    RootedSymbol symbol(cx, JS::Symbol::new_(cx, JS::SymbolCode::UniqueSymbol, desc));
    if (!symbol)
        return false;
    args.rval().setSymbol(symbol);
    return true;
}
bool
SharedArrayBufferObject::class_constructor(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    if (!args.isConstructing()) {
        if (args.hasDefined(0)) {
            ESClassValue cls;
            if (!GetClassOfValue(cx, args[0], &cls))
                return false;
            if (cls == ESClass_SharedArrayBuffer) {
                args.rval().set(args[0]);
                return true;
            }
        }
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_SHARED_ARRAY_BAD_OBJECT);
        return false;
    }

    // Bugs 1068458, 1161298: Limit length to 2^31-1.
    uint32_t length;
    bool overflow_unused;
    if (!ToLengthClamped(cx, args.get(0), &length, &overflow_unused) || length > INT32_MAX) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_SHARED_ARRAY_BAD_LENGTH);
        return false;
    }

    JSObject* bufobj = New(cx, length);
    if (!bufobj)
        return false;
    args.rval().setObject(*bufobj);
    return true;
}
示例#3
0
bool
SharedArrayBufferObject::class_constructor(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    if (!args.isConstructing()) {
        if (args.hasDefined(0) && IsObjectWithClass(args[0], ESClass_SharedArrayBuffer, cx)) {
            args.rval().set(args[0]);
            return true;
        }
        JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_SHARED_ARRAY_BAD_OBJECT);
        return false;
    }

    uint32_t length;
    bool overflow;
    if (!ToLengthClamped(cx, args.get(0), &length, &overflow)) {
        // Bug 1068458: Limit length to 2^31-1.
        if (overflow || length > INT32_MAX)
            JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_SHARED_ARRAY_BAD_LENGTH);
        return false;
    }

    JSObject *bufobj = New(cx, length);
    if (!bufobj)
        return false;
    args.rval().setObject(*bufobj);
    return true;
}
示例#4
0
static bool
HandleDynamicLinkFailure(JSContext *cx, CallArgs args, AsmJSModule &module, HandlePropertyName name)
{
    if (cx->isExceptionPending())
        return false;

    uint32_t begin = module.srcBodyStart();  // starts right after 'use asm'
    uint32_t end = module.srcEndBeforeCurly();
    Rooted<JSFlatString*> src(cx, module.scriptSource()->substringDontDeflate(cx, begin, end));
    if (!src)
        return false;

    RootedFunction fun(cx, NewScriptedFunction(cx, 0, JSFunction::INTERPRETED,
                       name, JSFunction::FinalizeKind,
                       TenuredObject));
    if (!fun)
        return false;

    AutoNameVector formals(cx);
    if (!formals.reserve(3))
        return false;

    if (module.globalArgumentName())
        formals.infallibleAppend(module.globalArgumentName());
    if (module.importArgumentName())
        formals.infallibleAppend(module.importArgumentName());
    if (module.bufferArgumentName())
        formals.infallibleAppend(module.bufferArgumentName());

    CompileOptions options(cx);
    options.setMutedErrors(module.scriptSource()->mutedErrors())
    .setFile(module.scriptSource()->filename())
    .setCompileAndGo(false)
    .setNoScriptRval(false);

    // The exported function inherits an implicit strict context if the module
    // also inherited it somehow.
    if (module.strict())
        options.strictOption = true;

    AutoStableStringChars stableChars(cx);
    if (!stableChars.initTwoByte(cx, src))
        return false;

    const char16_t *chars = stableChars.twoByteRange().start().get();
    SourceBufferHolder::Ownership ownership = stableChars.maybeGiveOwnershipToCaller()
            ? SourceBufferHolder::GiveOwnership
            : SourceBufferHolder::NoOwnership;
    SourceBufferHolder srcBuf(chars, end - begin, ownership);
    if (!frontend::CompileFunctionBody(cx, &fun, options, formals, srcBuf,
                                       /* enclosingScope = */ NullPtr()))
        return false;

    // Call the function we just recompiled.
    args.setCallee(ObjectValue(*fun));
    return Invoke(cx, args, args.isConstructing() ? CONSTRUCT : NO_CONSTRUCT);
}
示例#5
0
bool
js::intl_DateTimeFormat(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    MOZ_ASSERT(args.length() == 2);
    MOZ_ASSERT(!args.isConstructing());
    // intl_DateTimeFormat is an intrinsic for self-hosted JavaScript, so it
    // cannot be used with "new", but it still has to be treated as a
    // constructor.
    return DateTimeFormat(cx, args, true, DateTimeFormatOptions::Standard);
}
bool
js::proxy(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    if (!args.isConstructing()) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_NOT_FUNCTION, "Proxy");
        return false;
    }

    return NewScriptedProxy(cx, args, "Proxy");
}
示例#7
0
static bool
Boolean(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    bool b = args.length() != 0 ? JS::ToBoolean(args[0]) : false;

    if (args.isConstructing()) {
        JSObject *obj = BooleanObject::create(cx, b);
        if (!obj)
            return false;
        args.rval().setObject(*obj);
    } else {
        args.rval().setBoolean(b);
    }
    return true;
}
示例#8
0
static bool
HandleDynamicLinkFailure(JSContext *cx, CallArgs args, AsmJSModule &module, HandlePropertyName name)
{
    if (cx->isExceptionPending())
        return false;

    uint32_t begin = module.offsetToEndOfUseAsm();
    uint32_t end = module.funcEndBeforeCurly();
    Rooted<JSFlatString*> src(cx, module.scriptSource()->substring(cx, begin, end));
    if (!src)
        return false;

    RootedFunction fun(cx, NewFunction(cx, NullPtr(), nullptr, 0, JSFunction::INTERPRETED,
                                       cx->global(), name, JSFunction::FinalizeKind,
                                       TenuredObject));
    if (!fun)
        return false;

    AutoNameVector formals(cx);
    formals.reserve(3);
    if (module.globalArgumentName())
        formals.infallibleAppend(module.globalArgumentName());
    if (module.importArgumentName())
        formals.infallibleAppend(module.importArgumentName());
    if (module.bufferArgumentName())
        formals.infallibleAppend(module.bufferArgumentName());

    CompileOptions options(cx);
    options.setOriginPrincipals(module.scriptSource()->originPrincipals())
           .setFile(module.scriptSource()->filename())
           .setCompileAndGo(false)
           .setNoScriptRval(false);

    // The exported function inherits an implicit strict context if the module
    // also inherited it somehow.
    if (module.strict())
        options.strictOption = true;

    SourceBufferHolder srcBuf(src->chars(), end - begin, SourceBufferHolder::NoOwnership);
    if (!frontend::CompileFunctionBody(cx, &fun, options, formals, srcBuf))
        return false;

    // Call the function we just recompiled.
    args.setCallee(ObjectValue(*fun));
    return Invoke(cx, args, args.isConstructing() ? CONSTRUCT : NO_CONSTRUCT);
}
示例#9
0
bool
WeakSetObject::construct(JSContext *cx, unsigned argc, Value *vp)
{
    Rooted<WeakSetObject*> obj(cx, WeakSetObject::create(cx));
    if (!obj)
        return false;

    // Based on our "Set" implementation instead of the more general ES6 steps.
    CallArgs args = CallArgsFromVp(argc, vp);

    if (!args.isConstructing()) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_FUNCTION, "WeakSet");
        return false;
    }

    if (args.hasDefined(0)) {
        RootedObject map(cx, &obj->getReservedSlot(WEAKSET_MAP_SLOT).toObject());

        ForOfIterator iter(cx);
        if (!iter.init(args[0]))
            return false;

        RootedValue keyVal(cx);
        RootedObject keyObject(cx);
        RootedValue placeholder(cx, BooleanValue(true));
        while (true) {
            bool done;
            if (!iter.next(&keyVal, &done))
                return false;
            if (done)
                break;

            if (keyVal.isPrimitive()) {
                JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT);
                return false;
            }

            keyObject = &keyVal.toObject();
            if (!SetWeakMapEntry(cx, map, keyObject, placeholder))
                return false;
        }
    }

    args.rval().setObject(*obj);
    return true;
}
示例#10
0
static bool
regexp_construct(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    if (!args.isConstructing()) {
        /*
         * If first arg is regexp and no flags are given, just return the arg.
         * Otherwise, delegate to the standard constructor.
         * See ECMAv5 15.10.3.1.
         */
        if (args.hasDefined(0) &&
            IsObjectWithClass(args[0], ESClass_RegExp, cx) &&
            !args.hasDefined(1))
        {
            args.rval().set(args[0]);
            return true;
        }
    }

    RegExpObjectBuilder builder(cx);
    return CompileRegExpObject(cx, builder, args);
}
示例#11
0
bool
js::regexp_construct_no_statics(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    MOZ_ASSERT(args.length() == 1 || args.length() == 2);
    MOZ_ASSERT(args[0].isString());
    MOZ_ASSERT_IF(args.length() == 2, args[1].isString());
    MOZ_ASSERT(!args.isConstructing());

    /* Steps 1-6 are not required since pattern is always string. */

    /* Steps 7-10. */
    Rooted<RegExpObject*> regexp(cx, RegExpAlloc(cx));
    if (!regexp)
        return false;

    if (!RegExpInitialize(cx, regexp, args[0], args.get(1), DontUseRegExpStatics))
        return false;

    args.rval().setObject(*regexp);
    return true;
}
    /*
     * Shared{Type}Array(object)
     *
     * new Shared{Type}Array(length)
     * new Shared{Type}Array(SharedArrayBuffer, [optional] byteOffset, [optional] length)
     */
    static bool
    class_constructor(JSContext *cx, unsigned argc, Value *vp)
    {
        CallArgs args = CallArgsFromVp(argc, vp);

        if (!args.isConstructing()) {
            if (args.hasDefined(0) &&
                args[0].isObject() &&
                args[0].toObject().is<SharedTypedArrayObject>() &&
                AnyTypedArrayType(&args[0].toObject()) == ArrayTypeID())
            {
                args.rval().set(args[0]);
                return true;
            }
            JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_SHARED_TYPED_ARRAY_BAD_LENGTH);
            return false;
        }

        JSObject *obj = create(cx, args);
        if (!obj)
            return false;
        args.rval().setObject(*obj);
        return true;
    }
示例#13
0
bool
js::obj_construct(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    RootedObject obj(cx, nullptr);
    if (args.isConstructing() && (&args.newTarget().toObject() != &args.callee())) {
        RootedObject newTarget(cx, &args.newTarget().toObject());
        obj = CreateThis(cx, &PlainObject::class_, newTarget);
        if (!obj)
            return false;
    } else if (args.length() > 0 && !args[0].isNullOrUndefined()) {
        obj = ToObject(cx, args[0]);
        if (!obj)
            return false;
    } else {
        /* Make an object whether this was called with 'new' or not. */
        if (!NewObjectScriptedCall(cx, &obj))
            return false;
    }

    args.rval().setObject(*obj);
    return true;
}
示例#14
0
bool
Module::callExport(JSContext* cx, uint32_t exportIndex, CallArgs args)
{
    MOZ_ASSERT(dynamicallyLinked_);

    const Export& exp = exports()[exportIndex];

    // Enable/disable profiling in the Module to match the current global
    // profiling state. Don't do this if the Module is already active on the
    // stack since this would leave the Module in a state where profiling is
    // enabled but the stack isn't unwindable.
    if (profilingEnabled() != cx->runtime()->spsProfiler.enabled() && !activation()) {
        if (!setProfilingEnabled(cx, cx->runtime()->spsProfiler.enabled()))
            return false;
    }

    // The calling convention for an external call into wasm is to pass an
    // array of 16-byte values where each value contains either a coerced int32
    // (in the low word), a double value (in the low dword) or a SIMD vector
    // value, with the coercions specified by the wasm signature. The external
    // entry point unpacks this array into the system-ABI-specified registers
    // and stack memory and then calls into the internal entry point. The return
    // value is stored in the first element of the array (which, therefore, must
    // have length >= 1).
    Vector<Module::EntryArg, 8> coercedArgs(cx);
    if (!coercedArgs.resize(Max<size_t>(1, exp.sig().args().length())))
        return false;

    RootedValue v(cx);
    for (unsigned i = 0; i < exp.sig().args().length(); ++i) {
        v = i < args.length() ? args[i] : UndefinedValue();
        switch (exp.sig().arg(i)) {
          case ValType::I32:
            if (!ToInt32(cx, v, (int32_t*)&coercedArgs[i]))
                return false;
            break;
          case ValType::I64:
            MOZ_CRASH("int64");
          case ValType::F32:
            if (!RoundFloat32(cx, v, (float*)&coercedArgs[i]))
                return false;
            break;
          case ValType::F64:
            if (!ToNumber(cx, v, (double*)&coercedArgs[i]))
                return false;
            break;
          case ValType::I32x4: {
            SimdConstant simd;
            if (!ToSimdConstant<Int32x4>(cx, v, &simd))
                return false;
            memcpy(&coercedArgs[i], simd.asInt32x4(), Simd128DataSize);
            break;
          }
          case ValType::F32x4: {
            SimdConstant simd;
            if (!ToSimdConstant<Float32x4>(cx, v, &simd))
                return false;
            memcpy(&coercedArgs[i], simd.asFloat32x4(), Simd128DataSize);
            break;
          }
          case ValType::B32x4: {
            SimdConstant simd;
            if (!ToSimdConstant<Bool32x4>(cx, v, &simd))
                return false;
            // Bool32x4 uses the same representation as Int32x4.
            memcpy(&coercedArgs[i], simd.asInt32x4(), Simd128DataSize);
            break;
          }
          case ValType::Limit:
            MOZ_CRASH("Limit");
        }
    }

    {
        // Push a WasmActivation to describe the wasm frames we're about to push
        // when running this module. Additionally, push a JitActivation so that
        // the optimized wasm-to-Ion FFI call path (which we want to be very
        // fast) can avoid doing so. The JitActivation is marked as inactive so
        // stack iteration will skip over it.
        WasmActivation activation(cx, *this);
        JitActivation jitActivation(cx, /* active */ false);

        // Call the per-exported-function trampoline created by GenerateEntry.
        auto entry = JS_DATA_TO_FUNC_PTR(EntryFuncPtr, code() + exp.stubOffset());
        if (!CALL_GENERATED_2(entry, coercedArgs.begin(), globalData()))
            return false;
    }

    if (args.isConstructing()) {
        // By spec, when a function is called as a constructor and this function
        // returns a primary type, which is the case for all wasm exported
        // functions, the returned value is discarded and an empty object is
        // returned instead.
        PlainObject* obj = NewBuiltinClassInstance<PlainObject>(cx);
        if (!obj)
            return false;
        args.rval().set(ObjectValue(*obj));
        return true;
    }

    JSObject* simdObj;
    switch (exp.sig().ret()) {
      case ExprType::Void:
        args.rval().set(UndefinedValue());
        break;
      case ExprType::I32:
        args.rval().set(Int32Value(*(int32_t*)&coercedArgs[0]));
        break;
      case ExprType::I64:
        MOZ_CRASH("int64");
      case ExprType::F32:
      case ExprType::F64:
        args.rval().set(NumberValue(*(double*)&coercedArgs[0]));
        break;
      case ExprType::I32x4:
        simdObj = CreateSimd<Int32x4>(cx, (int32_t*)&coercedArgs[0]);
        if (!simdObj)
            return false;
        args.rval().set(ObjectValue(*simdObj));
        break;
      case ExprType::F32x4:
        simdObj = CreateSimd<Float32x4>(cx, (float*)&coercedArgs[0]);
        if (!simdObj)
            return false;
        args.rval().set(ObjectValue(*simdObj));
        break;
      case ExprType::B32x4:
        simdObj = CreateSimd<Bool32x4>(cx, (int32_t*)&coercedArgs[0]);
        if (!simdObj)
            return false;
        args.rval().set(ObjectValue(*simdObj));
        break;
      case ExprType::Limit:
        MOZ_CRASH("Limit");
    }

    return true;
}
示例#15
0
// The JSNative for the functions nested in an asm.js module. Calling this
// native will trampoline into generated code.
static bool
CallAsmJS(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs callArgs = CallArgsFromVp(argc, vp);
    RootedFunction callee(cx, &callArgs.callee().as<JSFunction>());

    // An asm.js function stores, in its extended slots:
    //  - a pointer to the module from which it was returned
    //  - its index in the ordered list of exported functions
    AsmJSModule &module = FunctionToEnclosingModule(callee);

    // Enable/disable profiling in the asm.js module to match the current global
    // profiling state. Don't do this if the module is already active on the
    // stack since this would leave the module in a state where profiling is
    // enabled but the stack isn't unwindable.
    if (module.profilingEnabled() != cx->runtime()->spsProfiler.enabled() && !module.active())
        module.setProfilingEnabled(cx->runtime()->spsProfiler.enabled(), cx);

    // An exported function points to the code as well as the exported
    // function's signature, which implies the dynamic coercions performed on
    // the arguments.
    const AsmJSModule::ExportedFunction &func = FunctionToExportedFunction(callee, module);

    // The calling convention for an external call into asm.js is to pass an
    // array of 8-byte values where each value contains either a coerced int32
    // (in the low word) or double value, with the coercions specified by the
    // asm.js signature. The external entry point unpacks this array into the
    // system-ABI-specified registers and stack memory and then calls into the
    // internal entry point. The return value is stored in the first element of
    // the array (which, therefore, must have length >= 1).

    js::Vector<uint64_t, 8> coercedArgs(cx);
    if (!coercedArgs.resize(Max<size_t>(1, func.numArgs())))
        return false;

    RootedValue v(cx);
    for (unsigned i = 0; i < func.numArgs(); ++i) {
        v = i < callArgs.length() ? callArgs[i] : UndefinedValue();
        switch (func.argCoercion(i)) {
        case AsmJS_ToInt32:
            if (!ToInt32(cx, v, (int32_t*)&coercedArgs[i]))
                return false;
            break;
        case AsmJS_ToNumber:
            if (!ToNumber(cx, v, (double*)&coercedArgs[i]))
                return false;
            break;
        case AsmJS_FRound:
            if (!RoundFloat32(cx, v, (float *)&coercedArgs[i]))
                return false;
            break;
        }
    }

    // An asm.js module is specialized to its heap's base address and length
    // which is normally immutable except for the neuter operation that occurs
    // when an ArrayBuffer is transfered. Throw an internal error if we're
    // about to run with a neutered heap.
    if (module.maybeHeapBufferObject() && module.maybeHeapBufferObject()->isNeutered()) {
        js_ReportOverRecursed(cx);
        return false;
    }

    {
        // Push an AsmJSActivation to describe the asm.js frames we're about to
        // push when running this module. Additionally, push a JitActivation so
        // that the optimized asm.js-to-Ion FFI call path (which we want to be
        // very fast) can avoid doing so. The JitActivation is marked as
        // inactive so stack iteration will skip over it.
        AsmJSActivation activation(cx, module);
        JitActivation jitActivation(cx, /* firstFrameIsConstructing = */ false, /* active */ false);

        // Call the per-exported-function trampoline created by GenerateEntry.
        AsmJSModule::CodePtr enter = module.entryTrampoline(func);
        if (!CALL_GENERATED_ASMJS(enter, coercedArgs.begin(), module.globalData()))
            return false;
    }

    if (callArgs.isConstructing()) {
        // By spec, when a function is called as a constructor and this function
        // returns a primary type, which is the case for all asm.js exported
        // functions, the returned value is discarded and an empty object is
        // returned instead.
        JSObject *obj = NewBuiltinClassInstance(cx, &JSObject::class_);
        callArgs.rval().set(ObjectValue(*obj));
        return true;
    }

    switch (func.returnType()) {
    case AsmJSModule::Return_Void:
        callArgs.rval().set(UndefinedValue());
        break;
    case AsmJSModule::Return_Int32:
        callArgs.rval().set(Int32Value(*(int32_t*)&coercedArgs[0]));
        break;
    case AsmJSModule::Return_Double:
        callArgs.rval().set(NumberValue(*(double*)&coercedArgs[0]));
        break;
    }

    return true;
}
示例#16
0
static bool
DateTimeFormat(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);
    return DateTimeFormat(cx, args, args.isConstructing(), DateTimeFormatOptions::Standard);
}
示例#17
0
bool
WeakSetObject::construct(JSContext* cx, unsigned argc, Value* vp)
{
    Rooted<WeakSetObject*> obj(cx, WeakSetObject::create(cx));
    if (!obj)
        return false;

    // Based on our "Set" implementation instead of the more general ES6 steps.
    CallArgs args = CallArgsFromVp(argc, vp);

    if (!args.isConstructing()) {
        JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_FUNCTION, "WeakSet");
        return false;
    }

    if (!args.get(0).isNullOrUndefined()) {
        RootedObject map(cx, &obj->getReservedSlot(WEAKSET_MAP_SLOT).toObject());

        RootedValue adderVal(cx);
        if (!GetProperty(cx, obj, obj, cx->names().add, &adderVal))
            return false;

        if (!IsCallable(adderVal))
            return ReportIsNotFunction(cx, adderVal);

        JSFunction* adder;
        bool isOriginalAdder = IsFunctionObject(adderVal, &adder) &&
                               IsSelfHostedFunctionWithName(adder, cx->names().WeakSet_add);
        RootedValue setVal(cx, ObjectValue(*obj));
        FastInvokeGuard fig(cx, adderVal);
        InvokeArgs& args2 = fig.args();

        JS::ForOfIterator iter(cx);
        if (!iter.init(args[0]))
            return false;

        RootedValue keyVal(cx);
        RootedObject keyObject(cx);
        RootedValue placeholder(cx, BooleanValue(true));
        while (true) {
            bool done;
            if (!iter.next(&keyVal, &done))
                return false;
            if (done)
                break;

            if (isOriginalAdder) {
                if (keyVal.isPrimitive()) {
                    JS_ReportErrorNumber(cx, js_GetErrorMessage, nullptr, JSMSG_NOT_NONNULL_OBJECT);
                    return false;
                }

                keyObject = &keyVal.toObject();
                if (!SetWeakMapEntry(cx, map, keyObject, placeholder))
                    return false;
            } else {
                if (!args2.init(1))
                    return false;

                args2.setCallee(adderVal);
                args2.setThis(setVal);
                args2[0].set(keyVal);

                if (!fig.invoke(cx))
                    return false;
            }
        }
    }

    args.rval().setObject(*obj);
    return true;
}
示例#18
0
/* ES6 21.2.3.1. */
bool
js::regexp_construct(JSContext* cx, unsigned argc, Value* vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    // Steps 1-2.
    bool patternIsRegExp;
    if (!IsRegExp(cx, args.get(0), &patternIsRegExp))
        return false;


    // We can delay step 3 and step 4a until later, during
    // GetPrototypeFromCallableConstructor calls. Accessing the new.target
    // and the callee from the stack is unobservable.
    if (!args.isConstructing()) {
        // Step 4b.
        if (patternIsRegExp && !args.hasDefined(1)) {
            RootedObject patternObj(cx, &args[0].toObject());

            // Steps 4b.i-ii.
            RootedValue patternConstructor(cx);
            if (!GetProperty(cx, patternObj, patternObj, cx->names().constructor, &patternConstructor))
                return false;

            // Step 4b.iii.
            if (patternConstructor.isObject() && patternConstructor.toObject() == args.callee()) {
                args.rval().set(args[0]);
                return true;
            }
        }
    }

    RootedValue patternValue(cx, args.get(0));

    // Step 5.
    ESClassValue cls;
    if (!GetClassOfValue(cx, patternValue, &cls))
        return false;
    if (cls == ESClass_RegExp) {
        // Beware!  |patternObj| might be a proxy into another compartment, so
        // don't assume |patternObj.is<RegExpObject>()|.  For the same reason,
        // don't reuse the RegExpShared below.
        RootedObject patternObj(cx, &patternValue.toObject());

        // Step 5
        RootedAtom sourceAtom(cx);
        RegExpFlag flags;
        {
            // Step 5.a.
            RegExpGuard g(cx);
            if (!RegExpToShared(cx, patternObj, &g))
                return false;
            sourceAtom = g->getSource();

            if (!args.hasDefined(1)) {
                // Step 5b.
                flags = g->getFlags();
            }
        }

        // Steps 8-9.
        RootedObject proto(cx);
        if (!GetPrototypeFromCallableConstructor(cx, args, &proto))
            return false;

        Rooted<RegExpObject*> regexp(cx, RegExpAlloc(cx, proto));
        if (!regexp)
            return false;

        // Step 10.
        if (args.hasDefined(1)) {
            // Step 5c / 21.2.3.2.2 RegExpInitialize step 5.
            flags = RegExpFlag(0);
            RootedString flagStr(cx, ToString<CanGC>(cx, args[1]));
            if (!flagStr)
                return false;
            if (!ParseRegExpFlags(cx, flagStr, &flags))
                return false;
        }

        if (!RegExpObject::initFromAtom(cx, regexp, sourceAtom, flags))
            return false;

        args.rval().setObject(*regexp);
        return true;
    }

    RootedValue P(cx);
    RootedValue F(cx);

    // Step 6.
    if (patternIsRegExp) {
        RootedObject patternObj(cx, &patternValue.toObject());

        // Steps 6a-b.
        if (!GetProperty(cx, patternObj, patternObj, cx->names().source, &P))
            return false;

        // Steps 6c-d.
        F = args.get(1);
        if (F.isUndefined()) {
            if (!GetProperty(cx, patternObj, patternObj, cx->names().flags, &F))
                return false;
        }
    } else {
        // Steps 7a-b.
        P = patternValue;
        F = args.get(1);
    }

    // Steps 8-9.
    RootedObject proto(cx);
    if (!GetPrototypeFromCallableConstructor(cx, args, &proto))
        return false;

    Rooted<RegExpObject*> regexp(cx, RegExpAlloc(cx, proto));
    if (!regexp)
        return false;

    // Step 10.
    if (!RegExpInitialize(cx, regexp, P, F, UseRegExpStatics))
        return false;

    args.rval().setObject(*regexp);
    return true;
}
示例#19
0
// This is the js::Native for functions exported by an asm.js module.
static bool
CallAsmJS(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs callArgs = CallArgsFromVp(argc, vp);
    RootedFunction callee(cx, &callArgs.callee().as<JSFunction>());
    AsmJSModule &module = FunctionToEnclosingModule(callee);
    const AsmJSModule::ExportedFunction &func = FunctionToExportedFunction(callee, module);

    // The heap-changing function is a special-case and is implemented by C++.
    if (func.isChangeHeap())
        return ChangeHeap(cx, module, callArgs);

    // Enable/disable profiling in the asm.js module to match the current global
    // profiling state. Don't do this if the module is already active on the
    // stack since this would leave the module in a state where profiling is
    // enabled but the stack isn't unwindable.
    if (module.profilingEnabled() != cx->runtime()->spsProfiler.enabled() && !module.active())
        module.setProfilingEnabled(cx->runtime()->spsProfiler.enabled(), cx);

    // The calling convention for an external call into asm.js is to pass an
    // array of 16-byte values where each value contains either a coerced int32
    // (in the low word), a double value (in the low dword) or a SIMD vector
    // value, with the coercions specified by the asm.js signature. The
    // external entry point unpacks this array into the system-ABI-specified
    // registers and stack memory and then calls into the internal entry point.
    // The return value is stored in the first element of the array (which,
    // therefore, must have length >= 1).
    js::Vector<AsmJSModule::EntryArg, 8> coercedArgs(cx);
    if (!coercedArgs.resize(Max<size_t>(1, func.numArgs())))
        return false;

    RootedValue v(cx);
    for (unsigned i = 0; i < func.numArgs(); ++i) {
        v = i < callArgs.length() ? callArgs[i] : UndefinedValue();
        switch (func.argCoercion(i)) {
        case AsmJS_ToInt32:
            if (!ToInt32(cx, v, (int32_t*)&coercedArgs[i]))
                return false;
            break;
        case AsmJS_ToNumber:
            if (!ToNumber(cx, v, (double*)&coercedArgs[i]))
                return false;
            break;
        case AsmJS_FRound:
            if (!RoundFloat32(cx, v, (float *)&coercedArgs[i]))
                return false;
            break;
        case AsmJS_ToInt32x4: {
            SimdConstant simd;
            if (!ToSimdConstant<Int32x4>(cx, v, &simd))
                return false;
            memcpy(&coercedArgs[i], simd.asInt32x4(), Simd128DataSize);
            break;
        }
        case AsmJS_ToFloat32x4: {
            SimdConstant simd;
            if (!ToSimdConstant<Float32x4>(cx, v, &simd))
                return false;
            memcpy(&coercedArgs[i], simd.asFloat32x4(), Simd128DataSize);
            break;
        }
        }
    }

    // The correct way to handle this situation would be to allocate a new range
    // of PROT_NONE memory and module.changeHeap to this memory. That would
    // cause every access to take the out-of-bounds signal-handler path which
    // does the right thing. For now, just throw an out-of-memory exception
    // since these can technically pop out anywhere and the full fix may
    // actually OOM when trying to allocate the PROT_NONE memory.
    if (module.hasDetachedHeap()) {
        JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_OUT_OF_MEMORY);
        return false;
    }

    {
        // Push an AsmJSActivation to describe the asm.js frames we're about to
        // push when running this module. Additionally, push a JitActivation so
        // that the optimized asm.js-to-Ion FFI call path (which we want to be
        // very fast) can avoid doing so. The JitActivation is marked as
        // inactive so stack iteration will skip over it.
        AsmJSActivation activation(cx, module);
        JitActivation jitActivation(cx, /* active */ false);

        // Call the per-exported-function trampoline created by GenerateEntry.
        AsmJSModule::CodePtr enter = module.entryTrampoline(func);
        if (!CALL_GENERATED_2(enter, coercedArgs.begin(), module.globalData()))
            return false;
    }

    if (callArgs.isConstructing()) {
        // By spec, when a function is called as a constructor and this function
        // returns a primary type, which is the case for all asm.js exported
        // functions, the returned value is discarded and an empty object is
        // returned instead.
        PlainObject *obj = NewBuiltinClassInstance<PlainObject>(cx);
        callArgs.rval().set(ObjectValue(*obj));
        return true;
    }

    JSObject *simdObj;
    switch (func.returnType()) {
    case AsmJSModule::Return_Void:
        callArgs.rval().set(UndefinedValue());
        break;
    case AsmJSModule::Return_Int32:
        callArgs.rval().set(Int32Value(*(int32_t*)&coercedArgs[0]));
        break;
    case AsmJSModule::Return_Double:
        callArgs.rval().set(NumberValue(*(double*)&coercedArgs[0]));
        break;
    case AsmJSModule::Return_Int32x4:
        simdObj = CreateSimd<Int32x4>(cx, (int32_t*)&coercedArgs[0]);
        if (!simdObj)
            return false;
        callArgs.rval().set(ObjectValue(*simdObj));
        break;
    case AsmJSModule::Return_Float32x4:
        simdObj = CreateSimd<Float32x4>(cx, (float*)&coercedArgs[0]);
        if (!simdObj)
            return false;
        callArgs.rval().set(ObjectValue(*simdObj));
        break;
    }

    return true;
}
示例#20
0
static bool
HandleDynamicLinkFailure(JSContext* cx, const CallArgs& args, AsmJSModule& module,
                         HandlePropertyName name)
{
    if (cx->isExceptionPending())
        return false;

    // Source discarding is allowed to affect JS semantics because it is never
    // enabled for normal JS content.
    bool haveSource = module.scriptSource()->hasSourceData();
    if (!haveSource && !JSScript::loadSource(cx, module.scriptSource(), &haveSource))
        return false;
    if (!haveSource) {
        JS_ReportError(cx, "asm.js link failure with source discarding enabled");
        return false;
    }

    uint32_t begin = module.srcBodyStart();  // starts right after 'use asm'
    uint32_t end = module.srcEndBeforeCurly();
    Rooted<JSFlatString*> src(cx, module.scriptSource()->substringDontDeflate(cx, begin, end));
    if (!src)
        return false;

    RootedFunction fun(cx, NewScriptedFunction(cx, 0, JSFunction::INTERPRETED_NORMAL,
                                               name, gc::AllocKind::FUNCTION,
                                               TenuredObject));
    if (!fun)
        return false;

    Rooted<PropertyNameVector> formals(cx, PropertyNameVector(cx));
    if (!formals.reserve(3))
        return false;

    if (module.globalArgumentName())
        formals.infallibleAppend(module.globalArgumentName());
    if (module.importArgumentName())
        formals.infallibleAppend(module.importArgumentName());
    if (module.bufferArgumentName())
        formals.infallibleAppend(module.bufferArgumentName());

    CompileOptions options(cx);
    options.setMutedErrors(module.scriptSource()->mutedErrors())
           .setFile(module.scriptSource()->filename())
           .setNoScriptRval(false);

    // The exported function inherits an implicit strict context if the module
    // also inherited it somehow.
    if (module.strict())
        options.strictOption = true;

    AutoStableStringChars stableChars(cx);
    if (!stableChars.initTwoByte(cx, src))
        return false;

    const char16_t* chars = stableChars.twoByteRange().start().get();
    SourceBufferHolder::Ownership ownership = stableChars.maybeGiveOwnershipToCaller()
                                              ? SourceBufferHolder::GiveOwnership
                                              : SourceBufferHolder::NoOwnership;
    SourceBufferHolder srcBuf(chars, end - begin, ownership);
    if (!frontend::CompileFunctionBody(cx, &fun, options, formals, srcBuf,
                                       /* enclosingScope = */ nullptr))
        return false;

    // Call the function we just recompiled.
    args.setCallee(ObjectValue(*fun));
    return Invoke(cx, args, args.isConstructing() ? CONSTRUCT : NO_CONSTRUCT);
}
示例#21
0
bool
Instance::callExport(JSContext* cx, uint32_t funcIndex, CallArgs args)
{
    if (!cx->compartment()->wasm.ensureProfilingState(cx))
        return false;

    const FuncExport& func = metadata().lookupFuncExport(funcIndex);

    // The calling convention for an external call into wasm is to pass an
    // array of 16-byte values where each value contains either a coerced int32
    // (in the low word), a double value (in the low dword) or a SIMD vector
    // value, with the coercions specified by the wasm signature. The external
    // entry point unpacks this array into the system-ABI-specified registers
    // and stack memory and then calls into the internal entry point. The return
    // value is stored in the first element of the array (which, therefore, must
    // have length >= 1).
    Vector<ExportArg, 8> exportArgs(cx);
    if (!exportArgs.resize(Max<size_t>(1, func.sig().args().length())))
        return false;

    RootedValue v(cx);
    for (unsigned i = 0; i < func.sig().args().length(); ++i) {
        v = i < args.length() ? args[i] : UndefinedValue();
        switch (func.sig().arg(i)) {
          case ValType::I32:
            if (!ToInt32(cx, v, (int32_t*)&exportArgs[i]))
                return false;
            break;
          case ValType::I64:
            if (!JitOptions.wasmTestMode) {
                JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_WASM_BAD_I64);
                return false;
            }
            if (!ReadI64Object(cx, v, (int64_t*)&exportArgs[i]))
                return false;
            break;
          case ValType::F32:
            if (JitOptions.wasmTestMode && v.isObject()) {
                if (!ReadCustomFloat32NaNObject(cx, v, (float*)&exportArgs[i]))
                    return false;
                break;
            }
            if (!RoundFloat32(cx, v, (float*)&exportArgs[i]))
                return false;
            break;
          case ValType::F64:
            if (JitOptions.wasmTestMode && v.isObject()) {
                if (!ReadCustomDoubleNaNObject(cx, v, (double*)&exportArgs[i]))
                    return false;
                break;
            }
            if (!ToNumber(cx, v, (double*)&exportArgs[i]))
                return false;
            break;
          case ValType::I8x16: {
            SimdConstant simd;
            if (!ToSimdConstant<Int8x16>(cx, v, &simd))
                return false;
            memcpy(&exportArgs[i], simd.asInt8x16(), Simd128DataSize);
            break;
          }
          case ValType::I16x8: {
            SimdConstant simd;
            if (!ToSimdConstant<Int16x8>(cx, v, &simd))
                return false;
            memcpy(&exportArgs[i], simd.asInt16x8(), Simd128DataSize);
            break;
          }
          case ValType::I32x4: {
            SimdConstant simd;
            if (!ToSimdConstant<Int32x4>(cx, v, &simd))
                return false;
            memcpy(&exportArgs[i], simd.asInt32x4(), Simd128DataSize);
            break;
          }
          case ValType::F32x4: {
            SimdConstant simd;
            if (!ToSimdConstant<Float32x4>(cx, v, &simd))
                return false;
            memcpy(&exportArgs[i], simd.asFloat32x4(), Simd128DataSize);
            break;
          }
          case ValType::B8x16: {
            SimdConstant simd;
            if (!ToSimdConstant<Bool8x16>(cx, v, &simd))
                return false;
            // Bool8x16 uses the same representation as Int8x16.
            memcpy(&exportArgs[i], simd.asInt8x16(), Simd128DataSize);
            break;
          }
          case ValType::B16x8: {
            SimdConstant simd;
            if (!ToSimdConstant<Bool16x8>(cx, v, &simd))
                return false;
            // Bool16x8 uses the same representation as Int16x8.
            memcpy(&exportArgs[i], simd.asInt16x8(), Simd128DataSize);
            break;
          }
          case ValType::B32x4: {
            SimdConstant simd;
            if (!ToSimdConstant<Bool32x4>(cx, v, &simd))
                return false;
            // Bool32x4 uses the same representation as Int32x4.
            memcpy(&exportArgs[i], simd.asInt32x4(), Simd128DataSize);
            break;
          }
          case ValType::Limit:
            MOZ_CRASH("Limit");
        }
    }

    {
        // Push a WasmActivation to describe the wasm frames we're about to push
        // when running this module. Additionally, push a JitActivation so that
        // the optimized wasm-to-Ion FFI call path (which we want to be very
        // fast) can avoid doing so. The JitActivation is marked as inactive so
        // stack iteration will skip over it.
        WasmActivation activation(cx);
        JitActivation jitActivation(cx, /* active */ false);

        // Call the per-exported-function trampoline created by GenerateEntry.
        auto funcPtr = JS_DATA_TO_FUNC_PTR(ExportFuncPtr, codeBase() + func.entryOffset());
        if (!CALL_GENERATED_2(funcPtr, exportArgs.begin(), &tlsData_))
            return false;
    }

    if (args.isConstructing()) {
        // By spec, when a function is called as a constructor and this function
        // returns a primary type, which is the case for all wasm exported
        // functions, the returned value is discarded and an empty object is
        // returned instead.
        PlainObject* obj = NewBuiltinClassInstance<PlainObject>(cx);
        if (!obj)
            return false;
        args.rval().set(ObjectValue(*obj));
        return true;
    }

    void* retAddr = &exportArgs[0];
    JSObject* retObj = nullptr;
    switch (func.sig().ret()) {
      case ExprType::Void:
        args.rval().set(UndefinedValue());
        break;
      case ExprType::I32:
        args.rval().set(Int32Value(*(int32_t*)retAddr));
        break;
      case ExprType::I64:
        if (!JitOptions.wasmTestMode) {
            JS_ReportErrorNumber(cx, GetErrorMessage, nullptr, JSMSG_WASM_BAD_I64);
            return false;
        }
        retObj = CreateI64Object(cx, *(int64_t*)retAddr);
        if (!retObj)
            return false;
        break;
      case ExprType::F32:
        if (JitOptions.wasmTestMode && IsNaN(*(float*)retAddr)) {
            retObj = CreateCustomNaNObject(cx, (float*)retAddr);
            if (!retObj)
                return false;
            break;
        }
        args.rval().set(NumberValue(*(float*)retAddr));
        break;
      case ExprType::F64:
        if (JitOptions.wasmTestMode && IsNaN(*(double*)retAddr)) {
            retObj = CreateCustomNaNObject(cx, (double*)retAddr);
            if (!retObj)
                return false;
            break;
        }
        args.rval().set(NumberValue(*(double*)retAddr));
        break;
      case ExprType::I8x16:
        retObj = CreateSimd<Int8x16>(cx, (int8_t*)retAddr);
        if (!retObj)
            return false;
        break;
      case ExprType::I16x8:
        retObj = CreateSimd<Int16x8>(cx, (int16_t*)retAddr);
        if (!retObj)
            return false;
        break;
      case ExprType::I32x4:
        retObj = CreateSimd<Int32x4>(cx, (int32_t*)retAddr);
        if (!retObj)
            return false;
        break;
      case ExprType::F32x4:
        retObj = CreateSimd<Float32x4>(cx, (float*)retAddr);
        if (!retObj)
            return false;
        break;
      case ExprType::B8x16:
        retObj = CreateSimd<Bool8x16>(cx, (int8_t*)retAddr);
        if (!retObj)
            return false;
        break;
      case ExprType::B16x8:
        retObj = CreateSimd<Bool16x8>(cx, (int16_t*)retAddr);
        if (!retObj)
            return false;
        break;
      case ExprType::B32x4:
        retObj = CreateSimd<Bool32x4>(cx, (int32_t*)retAddr);
        if (!retObj)
            return false;
        break;
      case ExprType::Limit:
        MOZ_CRASH("Limit");
    }

    if (retObj)
        args.rval().set(ObjectValue(*retObj));

    return true;
}