X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/b80e619319b1def83d1e8b4f84042b661be1be7f..14957cd040308e3eeec43d26bae5d76da13fcd85:/runtime/JSFunction.cpp

diff --git a/runtime/JSFunction.cpp b/runtime/JSFunction.cpp
index 89c4dae..e33d5d2 100644
--- a/runtime/JSFunction.cpp
+++ b/runtime/JSFunction.cpp
@@ -28,8 +28,10 @@
 #include "CodeBlock.h"
 #include "CommonIdentifiers.h"
 #include "CallFrame.h"
+#include "ExceptionHelpers.h"
 #include "FunctionPrototype.h"
 #include "JSGlobalObject.h"
+#include "JSNotAnObject.h"
 #include "Interpreter.h"
 #include "ObjectPrototype.h"
 #include "Parser.h"
@@ -40,86 +42,107 @@ using namespace WTF;
 using namespace Unicode;
 
 namespace JSC {
+EncodedJSValue JSC_HOST_CALL callHostFunctionAsConstructor(ExecState* exec)
+{
+    return throwVMError(exec, createNotAConstructorError(exec, exec->callee()));
+}
 
 ASSERT_CLASS_FITS_IN_CELL(JSFunction);
 
-const ClassInfo JSFunction::info = { "Function", &InternalFunction::info, 0, 0 };
+const ClassInfo JSFunction::s_info = { "Function", &Base::s_info, 0, 0 };
 
 bool JSFunction::isHostFunctionNonInline() const
 {
     return isHostFunction();
 }
 
-JSFunction::JSFunction(NonNullPassRefPtr<Structure> structure)
-    : Base(structure)
-    , m_executable(adoptRef(new VPtrHackExecutable()))
+JSFunction::JSFunction(VPtrStealingHackType)
+    : Base(VPtrStealingHack)
 {
 }
 
-JSFunction::JSFunction(ExecState* exec, NonNullPassRefPtr<Structure> structure, int length, const Identifier& name, NativeExecutable* thunk, NativeFunction func)
-    : Base(&exec->globalData(), structure, name)
-#if ENABLE(JIT)
-    , m_executable(thunk)
-#endif
+JSFunction::JSFunction(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, int length, const Identifier& name, NativeExecutable* thunk)
+    : Base(globalObject, structure)
+    , m_executable(exec->globalData(), this, thunk)
+    , m_scopeChain(exec->globalData(), this, globalObject->globalScopeChain())
 {
-#if ENABLE(JIT)
-    setNativeFunction(func);
-    putDirect(exec->propertyNames().length, jsNumber(exec, length), DontDelete | ReadOnly | DontEnum);
-#else
-    UNUSED_PARAM(thunk);
-    UNUSED_PARAM(length);
-    UNUSED_PARAM(func);
-    ASSERT_NOT_REACHED();
-#endif
+    ASSERT(inherits(&s_info));
+    putDirect(exec->globalData(), exec->globalData().propertyNames->name, jsString(exec, name.isNull() ? "" : name.ustring()), DontDelete | ReadOnly | DontEnum);
+    putDirect(exec->globalData(), exec->propertyNames().length, jsNumber(length), DontDelete | ReadOnly | DontEnum);
 }
 
-JSFunction::JSFunction(ExecState* exec, NonNullPassRefPtr<Structure> structure, int length, const Identifier& name, NativeFunction func)
-    : Base(&exec->globalData(), structure, name)
-#if ENABLE(JIT)
-    , m_executable(exec->globalData().jitStubs->ctiNativeCallThunk())
-#endif
+JSFunction::JSFunction(ExecState* exec, JSGlobalObject* globalObject, Structure* structure, int length, const Identifier& name, NativeFunction func)
+    : Base(globalObject, structure)
+    , m_scopeChain(exec->globalData(), this, globalObject->globalScopeChain())
 {
-#if ENABLE(JIT)
-    setNativeFunction(func);
-    putDirect(exec->propertyNames().length, jsNumber(exec, length), DontDelete | ReadOnly | DontEnum);
-#else
-    UNUSED_PARAM(length);
-    UNUSED_PARAM(func);
-    ASSERT_NOT_REACHED();
-#endif
+    ASSERT(inherits(&s_info));
+    
+    // Can't do this during initialization because getHostFunction might do a GC allocation.
+    m_executable.set(exec->globalData(), this, exec->globalData().getHostFunction(func));
+    
+    putDirect(exec->globalData(), exec->globalData().propertyNames->name, jsString(exec, name.isNull() ? "" : name.ustring()), DontDelete | ReadOnly | DontEnum);
+    putDirect(exec->globalData(), exec->propertyNames().length, jsNumber(length), DontDelete | ReadOnly | DontEnum);
 }
 
-JSFunction::JSFunction(ExecState* exec, NonNullPassRefPtr<FunctionExecutable> executable, ScopeChainNode* scopeChainNode)
-    : Base(&exec->globalData(), exec->lexicalGlobalObject()->functionStructure(), executable->name())
-    , m_executable(executable)
+JSFunction::JSFunction(ExecState* exec, FunctionExecutable* executable, ScopeChainNode* scopeChainNode)
+    : Base(scopeChainNode->globalObject.get(), scopeChainNode->globalObject->functionStructure())
+    , m_executable(exec->globalData(), this, executable)
+    , m_scopeChain(exec->globalData(), this, scopeChainNode)
 {
-    setScopeChain(scopeChainNode);
+    ASSERT(inherits(&s_info));
+    const Identifier& name = static_cast<FunctionExecutable*>(m_executable.get())->name();
+    putDirect(exec->globalData(), exec->globalData().propertyNames->name, jsString(exec, name.isNull() ? "" : name.ustring()), DontDelete | ReadOnly | DontEnum);
 }
 
 JSFunction::~JSFunction()
 {
     ASSERT(vptr() == JSGlobalData::jsFunctionVPtr);
+}
 
-    // JIT code for other functions may have had calls linked directly to the code for this function; these links
-    // are based on a check for the this pointer value for this JSFunction - which will no longer be valid once
-    // this memory is freed and may be reused (potentially for another, different JSFunction).
-    if (!isHostFunction()) {
-#if ENABLE(JIT_OPTIMIZE_CALL)
-        ASSERT(m_executable);
-        if (jsExecutable()->isGenerated())
-            jsExecutable()->generatedBytecode().unlinkCallers();
-#endif
-        scopeChain().~ScopeChain(); // FIXME: Don't we need to do this in the interpreter too?
-    }
+static const char* StrictModeCallerAccessError = "Cannot access caller property of a strict mode function";
+static const char* StrictModeArgumentsAccessError = "Cannot access arguments property of a strict mode function";
+
+static void createDescriptorForThrowingProperty(ExecState* exec, PropertyDescriptor& descriptor, const char* message)
+{
+    JSValue thrower = createTypeErrorFunction(exec, message);
+    descriptor.setAccessorDescriptor(thrower, thrower, DontEnum | DontDelete | Getter | Setter);
 }
 
-void JSFunction::markChildren(MarkStack& markStack)
+const UString& JSFunction::name(ExecState* exec)
 {
-    Base::markChildren(markStack);
-    if (!isHostFunction()) {
-        jsExecutable()->markAggregate(markStack);
-        scopeChain().markAggregate(markStack);
-    }
+    return asString(getDirect(exec->globalData(), exec->globalData().propertyNames->name))->tryGetValue();
+}
+
+const UString JSFunction::displayName(ExecState* exec)
+{
+    JSValue displayName = getDirect(exec->globalData(), exec->globalData().propertyNames->displayName);
+    
+    if (displayName && isJSString(&exec->globalData(), displayName))
+        return asString(displayName)->tryGetValue();
+    
+    return UString();
+}
+
+const UString JSFunction::calculatedDisplayName(ExecState* exec)
+{
+    const UString explicitName = displayName(exec);
+    
+    if (!explicitName.isEmpty())
+        return explicitName;
+    
+    return name(exec);
+}
+
+void JSFunction::visitChildren(SlotVisitor& visitor)
+{
+    ASSERT_GC_OBJECT_INHERITS(this, &s_info);
+    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
+    ASSERT(structure()->typeInfo().overridesVisitChildren());
+    Base::visitChildren(visitor);
+
+    visitor.append(&m_scopeChain);
+    if (m_executable)
+        visitor.append(&m_executable);
 }
 
 CallType JSFunction::getCallData(CallData& callData)
@@ -129,16 +152,10 @@ CallType JSFunction::getCallData(CallData& callData)
         return CallTypeHost;
     }
     callData.js.functionExecutable = jsExecutable();
-    callData.js.scopeChain = scopeChain().node();
+    callData.js.scopeChain = scope();
     return CallTypeJS;
 }
 
-JSValue JSFunction::call(ExecState* exec, JSValue thisValue, const ArgList& args)
-{
-    ASSERT(!isHostFunction());
-    return exec->interpreter()->execute(jsExecutable(), exec, this, thisValue.toThisObject(exec), args, scopeChain().node(), exec->exceptionSlot());
-}
-
 JSValue JSFunction::argumentsGetter(ExecState* exec, JSValue slotBase, const Identifier&)
 {
     JSFunction* thisObj = asFunction(slotBase);
@@ -153,11 +170,31 @@ JSValue JSFunction::callerGetter(ExecState* exec, JSValue slotBase, const Identi
     return exec->interpreter()->retrieveCaller(exec, thisObj);
 }
 
-JSValue JSFunction::lengthGetter(ExecState* exec, JSValue slotBase, const Identifier&)
+JSValue JSFunction::lengthGetter(ExecState*, JSValue slotBase, const Identifier&)
 {
     JSFunction* thisObj = asFunction(slotBase);
     ASSERT(!thisObj->isHostFunction());
-    return jsNumber(exec, thisObj->jsExecutable()->parameterCount());
+    return jsNumber(thisObj->jsExecutable()->parameterCount());
+}
+
+static inline WriteBarrierBase<Unknown>* createPrototypeProperty(JSGlobalData& globalData, JSGlobalObject* globalObject, JSFunction* function)
+{
+    ASSERT(!function->isHostFunction());
+
+    ExecState* exec = globalObject->globalExec();
+    if (WriteBarrierBase<Unknown>* location = function->getDirectLocation(globalData, exec->propertyNames().prototype))
+        return location;
+    JSObject* prototype = constructEmptyObject(exec, globalObject->emptyObjectStructure());
+    prototype->putDirect(globalData, exec->propertyNames().constructor, function, DontEnum);
+    function->putDirect(globalData, exec->propertyNames().prototype, prototype, DontDelete | DontEnum);
+    return function->getDirectLocation(exec->globalData(), exec->propertyNames().prototype);
+}
+
+void JSFunction::preventExtensions(JSGlobalData& globalData)
+{
+    if (!isHostFunction())
+        createPrototypeProperty(globalData, scope()->globalObject.get(), this);
+    JSObject::preventExtensions(globalData);
 }
 
 bool JSFunction::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
@@ -166,19 +203,21 @@ bool JSFunction::getOwnPropertySlot(ExecState* exec, const Identifier& propertyN
         return Base::getOwnPropertySlot(exec, propertyName, slot);
 
     if (propertyName == exec->propertyNames().prototype) {
-        JSValue* location = getDirectLocation(propertyName);
+        WriteBarrierBase<Unknown>* location = getDirectLocation(exec->globalData(), propertyName);
 
-        if (!location) {
-            JSObject* prototype = new (exec) JSObject(scopeChain().globalObject()->emptyObjectStructure());
-            prototype->putDirect(exec->propertyNames().constructor, this, DontEnum);
-            putDirect(exec->propertyNames().prototype, prototype, DontDelete);
-            location = getDirectLocation(propertyName);
-        }
+        if (!location)
+            location = createPrototypeProperty(exec->globalData(), scope()->globalObject.get(), this);
 
-        slot.setValueSlot(this, location, offsetForLocation(location));
+        slot.setValue(this, location->get(), offsetForLocation(location));
     }
 
     if (propertyName == exec->propertyNames().arguments) {
+        if (jsExecutable()->isStrictMode()) {
+            throwTypeError(exec, "Can't access arguments object of a strict mode function");
+            slot.setValue(jsNull());
+            return true;
+        }
+   
         slot.setCacheableCustom(this, argumentsGetter);
         return true;
     }
@@ -189,6 +228,11 @@ bool JSFunction::getOwnPropertySlot(ExecState* exec, const Identifier& propertyN
     }
 
     if (propertyName == exec->propertyNames().caller) {
+        if (jsExecutable()->isStrictMode()) {
+            throwTypeError(exec, StrictModeCallerAccessError);
+            slot.setValue(jsNull());
+            return true;
+        }
         slot.setCacheableCustom(this, callerGetter);
         return true;
     }
@@ -196,38 +240,48 @@ bool JSFunction::getOwnPropertySlot(ExecState* exec, const Identifier& propertyN
     return Base::getOwnPropertySlot(exec, propertyName, slot);
 }
 
-    bool JSFunction::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
-    {
-        if (isHostFunction())
-            return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
-        
-        if (propertyName == exec->propertyNames().prototype) {
-            PropertySlot slot;
-            getOwnPropertySlot(exec, propertyName, slot);
-            return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
-        }
-        
-        if (propertyName == exec->propertyNames().arguments) {
+bool JSFunction::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)
+{
+    if (isHostFunction())
+        return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+    
+    if (propertyName == exec->propertyNames().prototype) {
+        PropertySlot slot;
+        getOwnPropertySlot(exec, propertyName, slot);
+        return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+    }
+    
+    if (propertyName == exec->propertyNames().arguments) {
+        if (jsExecutable()->isStrictMode())
+            createDescriptorForThrowingProperty(exec, descriptor, StrictModeArgumentsAccessError);
+        else
             descriptor.setDescriptor(exec->interpreter()->retrieveArguments(exec, this), ReadOnly | DontEnum | DontDelete);
-            return true;
-        }
-        
-        if (propertyName == exec->propertyNames().length) {
-            descriptor.setDescriptor(jsNumber(exec, jsExecutable()->parameterCount()), ReadOnly | DontEnum | DontDelete);
-            return true;
-        }
-        
-        if (propertyName == exec->propertyNames().caller) {
+        return true;
+    }
+    
+    if (propertyName == exec->propertyNames().length) {
+        descriptor.setDescriptor(jsNumber(jsExecutable()->parameterCount()), ReadOnly | DontEnum | DontDelete);
+        return true;
+    }
+    
+    if (propertyName == exec->propertyNames().caller) {
+        if (jsExecutable()->isStrictMode())
+            createDescriptorForThrowingProperty(exec, descriptor, StrictModeCallerAccessError);
+        else
             descriptor.setDescriptor(exec->interpreter()->retrieveCaller(exec, this), ReadOnly | DontEnum | DontDelete);
-            return true;
-        }
-        
-        return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+        return true;
     }
     
+    return Base::getOwnPropertyDescriptor(exec, propertyName, descriptor);
+}
+
 void JSFunction::getOwnPropertyNames(ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
 {
     if (!isHostFunction() && (mode == IncludeDontEnumProperties)) {
+        // Make sure prototype has been reified.
+        PropertySlot slot;
+        getOwnPropertySlot(exec, exec->propertyNames().prototype, slot);
+
         propertyNames.add(exec->propertyNames().arguments);
         propertyNames.add(exec->propertyNames().callee);
         propertyNames.add(exec->propertyNames().caller);
@@ -242,6 +296,22 @@ void JSFunction::put(ExecState* exec, const Identifier& propertyName, JSValue va
         Base::put(exec, propertyName, value, slot);
         return;
     }
+    if (propertyName == exec->propertyNames().prototype) {
+        // Make sure prototype has been reified, such that it can only be overwritten
+        // following the rules set out in ECMA-262 8.12.9.
+        PropertySlot slot;
+        getOwnPropertySlot(exec, propertyName, slot);
+    }
+    if (jsExecutable()->isStrictMode()) {
+        if (propertyName == exec->propertyNames().arguments) {
+            throwTypeError(exec, StrictModeArgumentsAccessError);
+            return;
+        }
+        if (propertyName == exec->propertyNames().caller) {
+            throwTypeError(exec, StrictModeCallerAccessError);
+            return;
+        }
+    }
     if (propertyName == exec->propertyNames().arguments || propertyName == exec->propertyNames().length)
         return;
     Base::put(exec, propertyName, value, slot);
@@ -262,25 +332,8 @@ ConstructType JSFunction::getConstructData(ConstructData& constructData)
     if (isHostFunction())
         return ConstructTypeNone;
     constructData.js.functionExecutable = jsExecutable();
-    constructData.js.scopeChain = scopeChain().node();
+    constructData.js.scopeChain = scope();
     return ConstructTypeJS;
 }
 
-JSObject* JSFunction::construct(ExecState* exec, const ArgList& args)
-{
-    ASSERT(!isHostFunction());
-    Structure* structure;
-    JSValue prototype = get(exec, exec->propertyNames().prototype);
-    if (prototype.isObject())
-        structure = asObject(prototype)->inheritorID();
-    else
-        structure = exec->lexicalGlobalObject()->emptyObjectStructure();
-    JSObject* thisObj = new (exec) JSObject(structure);
-
-    JSValue result = exec->interpreter()->execute(jsExecutable(), exec, this, thisObj, args, scopeChain().node(), exec->exceptionSlot());
-    if (exec->hadException() || !result.isObject())
-        return thisObj;
-    return asObject(result);
-}
-
 } // namespace JSC