Imported QtWebKit TP3 (git b57bc6801f1876c3220d5a4bfea33d620d477443)

Change-Id: I3b1d8a2808782c9f34d50240000e20cb38d3680f
Reviewed-by: Konstantin Tokarev <annulen@yandex.ru>

1 files changed, 108 insertions, 85 deletions

diff --git a/Source/JavaScriptCore/interpreter/Interpreter.h b/Source/JavaScriptCore/interpreter/Interpreter.h
index e5eca0e1c..aba745f17 100644
--- a/Source/JavaScriptCore/interpreter/Interpreter.h
+++ b/Source/JavaScriptCore/interpreter/Interpreter.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2008, 2013 Apple Inc. All rights reserved.
+ * Copyright (C) 2008, 2013, 2015 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Research In Motion Limited. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -11,7 +11,7 @@
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
- * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
@@ -33,11 +33,12 @@
 #include "ArgList.h"
 #include "JSCJSValue.h"
 #include "JSCell.h"
-#include "JSFunction.h"
 #include "JSObject.h"
 #include "JSStack.h"
 #include "LLIntData.h"
 #include "Opcode.h"
+#include "SourceProvider.h"
+#include "StackAlignment.h"
 
 #include <wtf/HashMap.h>
 #include <wtf/text/StringBuilder.h>
@@ -49,16 +50,23 @@ namespace JSC {
     class ExecutableBase;
     class FunctionExecutable;
     class VM;
+    class JSFunction;
     class JSGlobalObject;
+    class JSModuleEnvironment;
+    class JSModuleRecord;
     class LLIntOffsetsExtractor;
     class ProgramExecutable;
+    class ModuleProgramExecutable;
     class Register;
     class JSScope;
     class SamplingTool;
     struct CallFrameClosure;
     struct HandlerInfo;
     struct Instruction;
-    
+    struct ProtoCallFrame;
+
+    enum UnwindStart { UnwindFromCurrentFrame, UnwindFromCallerFrame };
+
     enum DebugHookID {
         WillExecuteProgram,
         DidExecuteProgram,
@@ -71,6 +79,7 @@ namespace JSC {
     enum StackFrameCodeType {
         StackFrameGlobalCode,
         StackFrameEvalCode,
+        StackFrameModuleCode,
         StackFrameFunctionCode,
         StackFrameNativeCode
     };
@@ -78,7 +87,7 @@ namespace JSC {
     struct StackFrame {
         Strong<JSObject> callee;
         StackFrameCodeType codeType;
-        Strong<ExecutableBase> executable;
+        Strong<ScriptExecutable> executable;
         Strong<UnlinkedCodeBlock> codeBlock;
         RefPtr<SourceProvider> code;
         int lineOffset;
@@ -87,58 +96,38 @@ namespace JSC {
         unsigned bytecodeOffset;
         String sourceURL;
         JS_EXPORT_PRIVATE String toString(CallFrame*);
-        String friendlySourceURL() const
-        {
-            String traceLine;
-
-            switch (codeType) {
-            case StackFrameEvalCode:
-            case StackFrameFunctionCode:
-            case StackFrameGlobalCode:
-                if (!sourceURL.isEmpty())
-                    traceLine = sourceURL.impl();
-                break;
-            case StackFrameNativeCode:
-                traceLine = "[native code]";
-                break;
-            }
-            return traceLine.isNull() ? emptyString() : traceLine;
-        }
-        String friendlyFunctionName(CallFrame* callFrame) const
-        {
-            String traceLine;
-            JSObject* stackFrameCallee = callee.get();
-
-            switch (codeType) {
-            case StackFrameEvalCode:
-                traceLine = "eval code";
-                break;
-            case StackFrameNativeCode:
-                if (callee)
-                    traceLine = getCalculatedDisplayName(callFrame, stackFrameCallee).impl();
-                break;
-            case StackFrameFunctionCode:
-                traceLine = getCalculatedDisplayName(callFrame, stackFrameCallee).impl();
-                break;
-            case StackFrameGlobalCode:
-                traceLine = "global code";
-                break;
-            }
-            return traceLine.isNull() ? emptyString() : traceLine;
-        }
+        String friendlySourceURL() const;
+        String friendlyFunctionName(CallFrame*) const;
         JS_EXPORT_PRIVATE void computeLineAndColumn(unsigned& line, unsigned& column);
 
     private:
         void expressionInfo(int& divot, int& startOffset, int& endOffset, unsigned& line, unsigned& column);
     };
 
+    class SuspendExceptionScope {
+    public:
+        SuspendExceptionScope(VM* vm)
+            : m_vm(vm)
+        {
+            oldException = vm->exception();
+            vm->clearException();
+        }
+        ~SuspendExceptionScope()
+        {
+            m_vm->restorePreviousException(oldException);
+        }
+    private:
+        Exception* oldException;
+        VM* m_vm;
+    };
+    
     class TopCallFrameSetter {
     public:
-        TopCallFrameSetter(VM& global, CallFrame* callFrame)
-            : vm(global)
-            , oldCallFrame(global.topCallFrame) 
+        TopCallFrameSetter(VM& currentVM, CallFrame* callFrame)
+            : vm(currentVM)
+            , oldCallFrame(currentVM.topCallFrame) 
         {
-            global.topCallFrame = callFrame;
+            currentVM.topCallFrame = callFrame;
         }
         
         ~TopCallFrameSetter() 
@@ -152,33 +141,52 @@ namespace JSC {
     
     class NativeCallFrameTracer {
     public:
-        ALWAYS_INLINE NativeCallFrameTracer(VM* global, CallFrame* callFrame)
+        ALWAYS_INLINE NativeCallFrameTracer(VM* vm, CallFrame* callFrame)
         {
-            ASSERT(global);
+            ASSERT(vm);
             ASSERT(callFrame);
-            global->topCallFrame = callFrame;
+            ASSERT(callFrame < vm->topVMEntryFrame);
+            vm->topCallFrame = callFrame;
         }
     };
 
+    class NativeCallFrameTracerWithRestore {
+    public:
+        ALWAYS_INLINE NativeCallFrameTracerWithRestore(VM* vm, VMEntryFrame* vmEntryFrame, CallFrame* callFrame)
+            : m_vm(vm)
+        {
+            ASSERT(vm);
+            ASSERT(callFrame);
+            m_savedTopVMEntryFrame = vm->topVMEntryFrame;
+            m_savedTopCallFrame = vm->topCallFrame;
+            vm->topVMEntryFrame = vmEntryFrame;
+            vm->topCallFrame = callFrame;
+        }
+
+        ALWAYS_INLINE ~NativeCallFrameTracerWithRestore()
+        {
+            m_vm->topVMEntryFrame = m_savedTopVMEntryFrame;
+            m_vm->topCallFrame = m_savedTopCallFrame;
+        }
+
+    private:
+        VM* m_vm;
+        VMEntryFrame* m_savedTopVMEntryFrame;
+        CallFrame* m_savedTopCallFrame;
+    };
+
     class Interpreter {
         WTF_MAKE_FAST_ALLOCATED;
         friend class CachedCall;
         friend class LLIntOffsetsExtractor;
         friend class JIT;
+        friend class VM;
 
     public:
-        class ErrorHandlingMode {
-        public:
-            JS_EXPORT_PRIVATE ErrorHandlingMode(ExecState*);
-            JS_EXPORT_PRIVATE ~ErrorHandlingMode();
-        private:
-            Interpreter& m_interpreter;
-        };
-
         Interpreter(VM &);
         ~Interpreter();
         
-        void initialize(bool canUseJIT);
+        void initialize();
 
         JSStack& stack() { return m_stack; }
         
@@ -195,7 +203,7 @@ namespace JSC {
         OpcodeID getOpcodeID(Opcode opcode)
         {
             ASSERT(m_initialized);
-#if ENABLE(COMPUTED_GOTO_OPCODES) && ENABLE(LLINT)
+#if ENABLE(COMPUTED_GOTO_OPCODES)
             ASSERT(isOpcode(opcode));
             return m_opcodeIDTable.get(opcode);
 #else
@@ -207,24 +215,23 @@ namespace JSC {
 
         JSValue execute(ProgramExecutable*, CallFrame*, JSObject* thisObj);
         JSValue executeCall(CallFrame*, JSObject* function, CallType, const CallData&, JSValue thisValue, const ArgList&);
-        JSObject* executeConstruct(CallFrame*, JSObject* function, ConstructType, const ConstructData&, const ArgList&);
+        JSObject* executeConstruct(CallFrame*, JSObject* function, ConstructType, const ConstructData&, const ArgList&, JSValue newTarget);
         JSValue execute(EvalExecutable*, CallFrame*, JSValue thisValue, JSScope*);
+        JSValue execute(ModuleProgramExecutable*, CallFrame*, JSModuleEnvironment*);
 
-        JSValue retrieveArgumentsFromVMCode(CallFrame*, JSFunction*) const;
-        JSValue retrieveCallerFromVMCode(CallFrame*, JSFunction*) const;
-        JS_EXPORT_PRIVATE void retrieveLastCaller(CallFrame*, int& lineNumber, intptr_t& sourceID, String& sourceURL, JSValue& function) const;
-        
         void getArgumentsData(CallFrame*, JSFunction*&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);
         
         SamplingTool* sampler() { return m_sampler.get(); }
 
-        bool isInErrorHandlingMode() { return m_errorHandlingModeReentry; }
+        NEVER_INLINE HandlerInfo* unwind(VM&, CallFrame*&, Exception*, UnwindStart);
+        void notifyDebuggerOfExceptionToBeThrown(CallFrame*, Exception*);
+        NEVER_INLINE void debug(CallFrame*, DebugHookID);
+        JSString* stackTraceAsString(ExecState*, Vector<StackFrame>);
 
-        NEVER_INLINE HandlerInfo* throwException(CallFrame*&, JSValue&, unsigned bytecodeOffset);
-        NEVER_INLINE void debug(CallFrame*, DebugHookID, int firstLine, int lastLine, int column);
-        static const String getTraceLine(CallFrame*, StackFrameCodeType, const String&, int);
-        JS_EXPORT_PRIVATE static void getStackTrace(VM*, Vector<StackFrame>& results, size_t maxStackSize = std::numeric_limits<size_t>::max());
-        static void addStackTraceIfNecessary(CallFrame*, JSValue error);
+        static EncodedJSValue JSC_HOST_CALL constructWithErrorConstructor(ExecState*);
+        static EncodedJSValue JSC_HOST_CALL callErrorConstructor(ExecState*);
+        static EncodedJSValue JSC_HOST_CALL constructWithNativeErrorConstructor(ExecState*);
+        static EncodedJSValue JSC_HOST_CALL callNativeErrorConstructor(ExecState*);
 
         void dumpSampleData(ExecState* exec);
         void startSampling();
@@ -232,29 +239,30 @@ namespace JSC {
 
         JS_EXPORT_PRIVATE void dumpCallFrame(CallFrame*);
 
+        void getStackTrace(Vector<StackFrame>& results, size_t maxStackSize = std::numeric_limits<size_t>::max());
+
     private:
         enum ExecutionFlag { Normal, InitializeAndReturn };
 
-        CallFrameClosure prepareForRepeatCall(FunctionExecutable*, CallFrame*, JSFunction*, int argumentCountIncludingThis, JSScope*);
-        void endRepeatCall(CallFrameClosure&);
+        CallFrameClosure prepareForRepeatCall(FunctionExecutable*, CallFrame*, ProtoCallFrame*, JSFunction*, int argumentCountIncludingThis, JSScope*, JSValue*);
+
         JSValue execute(CallFrameClosure&);
 
-        NEVER_INLINE bool unwindCallFrame(CallFrame*&, JSValue, unsigned& bytecodeOffset, CodeBlock*&);
 
-        static CallFrame* findFunctionCallFrameFromVMCode(CallFrame*, JSFunction*);
 
         void dumpRegisters(CallFrame*);
         
-        bool isCallBytecode(Opcode opcode) { return opcode == getOpcode(op_call) || opcode == getOpcode(op_construct) || opcode == getOpcode(op_call_eval); }
+        bool isCallBytecode(Opcode opcode) { return opcode == getOpcode(op_call) || opcode == getOpcode(op_construct) || opcode == getOpcode(op_call_eval) || opcode == getOpcode(op_tail_call); }
 
         void enableSampler();
         int m_sampleEntryDepth;
-        OwnPtr<SamplingTool> m_sampler;
+        std::unique_ptr<SamplingTool> m_sampler;
 
+        VM& m_vm;
         JSStack m_stack;
         int m_errorHandlingModeReentry;
         
-#if ENABLE(COMPUTED_GOTO_OPCODES) && ENABLE(LLINT)
+#if ENABLE(COMPUTED_GOTO_OPCODES)
         Opcode* m_opcodeTable; // Maps OpcodeID => Opcode for compiling
         HashMap<Opcode, OpcodeID> m_opcodeIDTable; // Maps Opcode => OpcodeID for decompiling
 #endif
@@ -264,15 +272,30 @@ namespace JSC {
 #endif
     };
 
-    // This value must not be an object that would require this conversion (WebCore's global object).
-    inline bool isValidThisObject(JSValue thisValue, ExecState* exec)
+    JSValue eval(CallFrame*);
+
+    inline CallFrame* calleeFrameForVarargs(CallFrame* callFrame, unsigned numUsedStackSlots, unsigned argumentCountIncludingThis)
     {
-        return !thisValue.isObject() || thisValue.toThisObject(exec) == thisValue;
+        // We want the new frame to be allocated on a stack aligned offset with a stack
+        // aligned size. Align the size here.
+        argumentCountIncludingThis = WTF::roundUpToMultipleOf(
+            stackAlignmentRegisters(),
+            argumentCountIncludingThis + JSStack::CallFrameHeaderSize) - JSStack::CallFrameHeaderSize;
+
+        // Align the frame offset here.
+        unsigned paddedCalleeFrameOffset = WTF::roundUpToMultipleOf(
+            stackAlignmentRegisters(),
+            numUsedStackSlots + argumentCountIncludingThis + JSStack::CallFrameHeaderSize);
+        return CallFrame::create(callFrame->registers() - paddedCalleeFrameOffset);
     }
 
-    JSValue eval(CallFrame*);
-    CallFrame* loadVarargs(CallFrame*, JSStack*, JSValue thisValue, JSValue arguments, int firstFreeRegister);
-
+    unsigned sizeOfVarargs(CallFrame* exec, JSValue arguments, uint32_t firstVarArgOffset);
+    static const unsigned maxArguments = 0x10000;
+    unsigned sizeFrameForVarargs(CallFrame* exec, JSStack*, JSValue arguments, unsigned numUsedStackSlots, uint32_t firstVarArgOffset);
+    void loadVarargs(CallFrame* execCaller, VirtualRegister firstElementDest, JSValue source, uint32_t offset, uint32_t length);
+    void setupVarargsFrame(CallFrame* execCaller, CallFrame* execCallee, JSValue arguments, uint32_t firstVarArgOffset, uint32_t length);
+    void setupVarargsFrameAndSetThis(CallFrame* execCaller, CallFrame* execCallee, JSValue thisValue, JSValue arguments, uint32_t firstVarArgOffset, uint32_t length);
+    
 } // namespace JSC
 
 #endif // Interpreter_h