Source/JavaScriptCore/interpreter/Interpreter.h - third_party/webkit - Git at Google

 /*
  * Copyright (C) 2008, 2013, 2015-2016 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
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 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 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.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #ifndef Interpreter_h
 #define Interpreter_h

 #include "ArgList.h"
 #include "CatchScope.h"
 #include "JSCJSValue.h"
 #include "JSCell.h"
 #include "JSObject.h"
 #include "Opcode.h"
 #include "StackAlignment.h"
 #include "StackFrame.h"
 #include <wtf/HashMap.h>

 #if !ENABLE(JIT)
 #include "CLoopStack.h"
 #endif


 namespace JSC {

     class CodeBlock;
     class EvalExecutable;
     class FunctionExecutable;
     class VM;
     class JSFunction;
     class JSGlobalObject;
     class JSModuleEnvironment;
     class JSModuleRecord;
     class LLIntOffsetsExtractor;
     class ProgramExecutable;
     class ModuleProgramExecutable;
     class Register;
     class JSScope;
     struct CallFrameClosure;
     struct HandlerInfo;
     struct Instruction;
     struct ProtoCallFrame;
     struct UnlinkedInstruction;

     enum UnwindStart : uint8_t { UnwindFromCurrentFrame, UnwindFromCallerFrame };

     enum DebugHookID {
         WillExecuteProgram,
         DidExecuteProgram,
         DidEnterCallFrame,
         DidReachBreakpoint,
         WillLeaveCallFrame,
         WillExecuteStatement
     };

     enum StackFrameCodeType {
         StackFrameGlobalCode,
         StackFrameEvalCode,
         StackFrameModuleCode,
         StackFrameFunctionCode,
         StackFrameNativeCode
     };

     class SuspendExceptionScope {
     public:
         SuspendExceptionScope(VM* vm)
             : m_vm(vm)
         {
             auto scope = DECLARE_CATCH_SCOPE(*vm);
             oldException = scope.exception();
             scope.clearException();
         }
         ~SuspendExceptionScope()
         {
             m_vm->restorePreviousException(oldException);
         }
     private:
         Exception* oldException;
         VM* m_vm;
     };

     class TopCallFrameSetter {
     public:
         TopCallFrameSetter(VM& currentVM, CallFrame* callFrame)
             : vm(currentVM)
             , oldCallFrame(currentVM.topCallFrame)
         {
             currentVM.topCallFrame = callFrame;
         }

         ~TopCallFrameSetter()
         {
             vm.topCallFrame = oldCallFrame;
         }
     private:
         VM& vm;
         CallFrame* oldCallFrame;
     };

     class NativeCallFrameTracer {
     public:
         ALWAYS_INLINE NativeCallFrameTracer(VM* vm, CallFrame* callFrame)
         {
             ASSERT(vm);
             ASSERT(callFrame);
             ASSERT(reinterpret_cast<void*>(callFrame) < reinterpret_cast<void*>(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:
         Interpreter(VM &);
         ~Interpreter();

         void initialize();

 #if !ENABLE(JIT)
         CLoopStack& cloopStack() { return m_cloopStack; }
 #endif

         Opcode getOpcode(OpcodeID id)
         {
             ASSERT(m_initialized);
 #if ENABLE(COMPUTED_GOTO_OPCODES)
             return m_opcodeTable[id];
 #else
             return id;
 #endif
         }

         OpcodeID getOpcodeID(Opcode opcode)
         {
             ASSERT(m_initialized);
 #if ENABLE(COMPUTED_GOTO_OPCODES)
             ASSERT(isOpcode(opcode));
             return m_opcodeIDTable.get(opcode);
 #else
             return opcode;
 #endif
         }

         OpcodeID getOpcodeID(const Instruction&);
         OpcodeID getOpcodeID(const UnlinkedInstruction&);

         bool isOpcode(Opcode);

         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&, JSValue newTarget);
         JSValue execute(EvalExecutable*, CallFrame*, JSValue thisValue, JSScope*);
         JSValue execute(ModuleProgramExecutable*, CallFrame*, JSModuleEnvironment*);

         void getArgumentsData(CallFrame*, JSFunction*&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);

         NEVER_INLINE HandlerInfo* unwind(VM&, CallFrame*&, Exception*, UnwindStart);
         void notifyDebuggerOfExceptionToBeThrown(CallFrame*, Exception*);
         NEVER_INLINE void debug(CallFrame*, DebugHookID);
         static JSString* stackTraceAsString(VM&, const Vector<StackFrame>&);

         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*);

         JS_EXPORT_PRIVATE void dumpCallFrame(CallFrame*);

         void getStackTrace(Vector<StackFrame>& results, size_t framesToSkip = 0, size_t maxStackSize = std::numeric_limits<size_t>::max());

     private:
         enum ExecutionFlag { Normal, InitializeAndReturn };

         CallFrameClosure prepareForRepeatCall(FunctionExecutable*, CallFrame*, ProtoCallFrame*, JSFunction*, int argumentCountIncludingThis, JSScope*, JSValue*);

         JSValue execute(CallFrameClosure&);


         void dumpRegisters(CallFrame*);

         bool isCallBytecode(Opcode opcode) { return opcode == getOpcode(op_call) || opcode == getOpcode(op_construct) || opcode == getOpcode(op_call_eval) || opcode == getOpcode(op_tail_call); }

         VM& m_vm;
 #if !ENABLE(JIT)
         CLoopStack m_cloopStack;
 #endif
         int m_errorHandlingModeReentry;

 #if ENABLE(COMPUTED_GOTO_OPCODES)
         Opcode* m_opcodeTable; // Maps OpcodeID => Opcode for compiling
         HashMap<Opcode, OpcodeID> m_opcodeIDTable; // Maps Opcode => OpcodeID for decompiling
 #endif

 #if !ASSERT_DISABLED
         bool m_initialized;
 #endif
     };

     JSValue eval(CallFrame*);

     inline CallFrame* calleeFrameForVarargs(CallFrame* callFrame, unsigned numUsedStackSlots, unsigned argumentCountIncludingThis)
     {
         // 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 + CallFrame::headerSizeInRegisters) - CallFrame::headerSizeInRegisters;

         // Align the frame offset here.
         unsigned paddedCalleeFrameOffset = WTF::roundUpToMultipleOf(
             stackAlignmentRegisters(),
             numUsedStackSlots + argumentCountIncludingThis + CallFrame::headerSizeInRegisters);
         return CallFrame::create(callFrame->registers() - paddedCalleeFrameOffset);
     }

     unsigned sizeOfVarargs(CallFrame* exec, JSValue arguments, uint32_t firstVarArgOffset);
     static const unsigned maxArguments = 0x10000;
     unsigned sizeFrameForVarargs(CallFrame* exec, VM&, JSValue arguments, unsigned numUsedStackSlots, uint32_t firstVarArgOffset);
     unsigned sizeFrameForForwardArguments(CallFrame* exec, VM&, unsigned numUsedStackSlots);
     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);
     void setupForwardArgumentsFrame(CallFrame* execCaller, CallFrame* execCallee, uint32_t length);
     void setupForwardArgumentsFrameAndSetThis(CallFrame* execCaller, CallFrame* execCallee, JSValue thisValue, uint32_t length);

 } // namespace JSC

 #endif // Interpreter_h
	/*
	* Copyright (C) 2008, 2013, 2015-2016 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
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 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 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.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#ifndef Interpreter_h
	#define Interpreter_h

	#include "ArgList.h"
	#include "CatchScope.h"
	#include "JSCJSValue.h"
	#include "JSCell.h"
	#include "JSObject.h"
	#include "Opcode.h"
	#include "StackAlignment.h"
	#include "StackFrame.h"
	#include <wtf/HashMap.h>

	#if !ENABLE(JIT)
	#include "CLoopStack.h"
	#endif


	namespace JSC {

	class CodeBlock;
	class EvalExecutable;
	class FunctionExecutable;
	class VM;
	class JSFunction;
	class JSGlobalObject;
	class JSModuleEnvironment;
	class JSModuleRecord;
	class LLIntOffsetsExtractor;
	class ProgramExecutable;
	class ModuleProgramExecutable;
	class Register;
	class JSScope;
	struct CallFrameClosure;
	struct HandlerInfo;
	struct Instruction;
	struct ProtoCallFrame;
	struct UnlinkedInstruction;

	enum UnwindStart : uint8_t { UnwindFromCurrentFrame, UnwindFromCallerFrame };

	enum DebugHookID {
	WillExecuteProgram,
	DidExecuteProgram,
	DidEnterCallFrame,
	DidReachBreakpoint,
	WillLeaveCallFrame,
	WillExecuteStatement
	};

	enum StackFrameCodeType {
	StackFrameGlobalCode,
	StackFrameEvalCode,
	StackFrameModuleCode,
	StackFrameFunctionCode,
	StackFrameNativeCode
	};

	class SuspendExceptionScope {
	public:
	SuspendExceptionScope(VM* vm)
	: m_vm(vm)
	{
	auto scope = DECLARE_CATCH_SCOPE(*vm);
	oldException = scope.exception();
	scope.clearException();
	}
	~SuspendExceptionScope()
	{
	m_vm->restorePreviousException(oldException);
	}
	private:
	Exception* oldException;
	VM* m_vm;
	};

	class TopCallFrameSetter {
	public:
	TopCallFrameSetter(VM& currentVM, CallFrame* callFrame)
	: vm(currentVM)
	, oldCallFrame(currentVM.topCallFrame)
	{
	currentVM.topCallFrame = callFrame;
	}

	~TopCallFrameSetter()
	{
	vm.topCallFrame = oldCallFrame;
	}
	private:
	VM& vm;
	CallFrame* oldCallFrame;
	};

	class NativeCallFrameTracer {
	public:
	ALWAYS_INLINE NativeCallFrameTracer(VM* vm, CallFrame* callFrame)
	{
	ASSERT(vm);
	ASSERT(callFrame);
	ASSERT(reinterpret_cast<void>(callFrame) < reinterpret_cast<void>(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:
	Interpreter(VM &);
	~Interpreter();

	void initialize();

	#if !ENABLE(JIT)
	CLoopStack& cloopStack() { return m_cloopStack; }
	#endif

	Opcode getOpcode(OpcodeID id)
	{
	ASSERT(m_initialized);
	#if ENABLE(COMPUTED_GOTO_OPCODES)
	return m_opcodeTable[id];
	#else
	return id;
	#endif
	}

	OpcodeID getOpcodeID(Opcode opcode)
	{
	ASSERT(m_initialized);
	#if ENABLE(COMPUTED_GOTO_OPCODES)
	ASSERT(isOpcode(opcode));
	return m_opcodeIDTable.get(opcode);
	#else
	return opcode;
	#endif
	}

	OpcodeID getOpcodeID(const Instruction&);
	OpcodeID getOpcodeID(const UnlinkedInstruction&);

	bool isOpcode(Opcode);

	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&, JSValue newTarget);
	JSValue execute(EvalExecutable, CallFrame, JSValue thisValue, JSScope*);
	JSValue execute(ModuleProgramExecutable, CallFrame, JSModuleEnvironment*);

	void getArgumentsData(CallFrame, JSFunction&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);

	NEVER_INLINE HandlerInfo* unwind(VM&, CallFrame&, Exception, UnwindStart);
	void notifyDebuggerOfExceptionToBeThrown(CallFrame, Exception);
	NEVER_INLINE void debug(CallFrame*, DebugHookID);
	static JSString* stackTraceAsString(VM&, const Vector<StackFrame>&);

	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*);

	JS_EXPORT_PRIVATE void dumpCallFrame(CallFrame*);

	void getStackTrace(Vector<StackFrame>& results, size_t framesToSkip = 0, size_t maxStackSize = std::numeric_limits<size_t>::max());

	private:
	enum ExecutionFlag { Normal, InitializeAndReturn };

	CallFrameClosure prepareForRepeatCall(FunctionExecutable, CallFrame, ProtoCallFrame, JSFunction, int argumentCountIncludingThis, JSScope, JSValue);

	JSValue execute(CallFrameClosure&);



	void dumpRegisters(CallFrame*);

	bool isCallBytecode(Opcode opcode) { return opcode == getOpcode(op_call) \|\| opcode == getOpcode(op_construct) \|\| opcode == getOpcode(op_call_eval) \|\| opcode == getOpcode(op_tail_call); }

	VM& m_vm;
	#if !ENABLE(JIT)
	CLoopStack m_cloopStack;
	#endif
	int m_errorHandlingModeReentry;

	#if ENABLE(COMPUTED_GOTO_OPCODES)
	Opcode* m_opcodeTable; // Maps OpcodeID => Opcode for compiling
	HashMap<Opcode, OpcodeID> m_opcodeIDTable; // Maps Opcode => OpcodeID for decompiling
	#endif

	#if !ASSERT_DISABLED
	bool m_initialized;
	#endif
	};

	JSValue eval(CallFrame*);

	inline CallFrame* calleeFrameForVarargs(CallFrame* callFrame, unsigned numUsedStackSlots, unsigned argumentCountIncludingThis)
	{
	// 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 + CallFrame::headerSizeInRegisters) - CallFrame::headerSizeInRegisters;

	// Align the frame offset here.
	unsigned paddedCalleeFrameOffset = WTF::roundUpToMultipleOf(
	stackAlignmentRegisters(),
	numUsedStackSlots + argumentCountIncludingThis + CallFrame::headerSizeInRegisters);
	return CallFrame::create(callFrame->registers() - paddedCalleeFrameOffset);
	}

	unsigned sizeOfVarargs(CallFrame* exec, JSValue arguments, uint32_t firstVarArgOffset);
	static const unsigned maxArguments = 0x10000;
	unsigned sizeFrameForVarargs(CallFrame* exec, VM&, JSValue arguments, unsigned numUsedStackSlots, uint32_t firstVarArgOffset);
	unsigned sizeFrameForForwardArguments(CallFrame* exec, VM&, unsigned numUsedStackSlots);
	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);
	void setupForwardArgumentsFrame(CallFrame* execCaller, CallFrame* execCallee, uint32_t length);
	void setupForwardArgumentsFrameAndSetThis(CallFrame* execCaller, CallFrame* execCallee, JSValue thisValue, uint32_t length);

	} // namespace JSC

	#endif // Interpreter_h