#ifndef Interpreter_h
#define Interpreter_h
#include "ArgList.h"
#include "JSCell.h"
#include "JSFunction.h"
#include "JSValue.h"
#include "JSObject.h"
#include "LLIntData.h"
#include "Opcode.h"
#include "RegisterFile.h"
#include <wtf/HashMap.h>
namespace JSC {
class CodeBlock;
class EvalExecutable;
class ExecutableBase;
class FunctionExecutable;
class JSGlobalObject;
class LLIntOffsetsExtractor;
class ProgramExecutable;
class Register;
class ScopeChainNode;
class SamplingTool;
struct CallFrameClosure;
struct HandlerInfo;
struct Instruction;
enum DebugHookID {
WillExecuteProgram,
DidExecuteProgram,
DidEnterCallFrame,
DidReachBreakpoint,
WillLeaveCallFrame,
WillExecuteStatement
};
enum StackFrameCodeType {
StackFrameGlobalCode,
StackFrameEvalCode,
StackFrameFunctionCode,
StackFrameNativeCode
};
struct StackFrame {
Strong<JSObject> callee;
StackFrameCodeType codeType;
Strong<ExecutableBase> executable;
int line;
UString sourceURL;
UString toString(CallFrame* callFrame) const
{
bool hasSourceURLInfo = !sourceURL.isNull() && !sourceURL.isEmpty();
bool hasLineInfo = line > -1;
String traceLine;
JSObject* stackFrameCallee = callee.get();
switch (codeType) {
case StackFrameEvalCode:
if (hasSourceURLInfo) {
traceLine = hasLineInfo ? String::format("eval code@%s:%d", sourceURL.ascii().data(), line)
: String::format("eval code@%s", sourceURL.ascii().data());
} else
traceLine = String::format("eval code");
break;
case StackFrameNativeCode: {
if (callee) {
UString functionName = getCalculatedDisplayName(callFrame, stackFrameCallee);
traceLine = String::format("%s@[native code]", functionName.ascii().data());
} else
traceLine = "[native code]";
break;
}
case StackFrameFunctionCode: {
UString functionName = getCalculatedDisplayName(callFrame, stackFrameCallee);
if (hasSourceURLInfo) {
traceLine = hasLineInfo ? String::format("%s@%s:%d", functionName.ascii().data(), sourceURL.ascii().data(), line)
: String::format("%s@%s", functionName.ascii().data(), sourceURL.ascii().data());
} else
traceLine = String::format("%s\n", functionName.ascii().data());
break;
}
case StackFrameGlobalCode:
if (hasSourceURLInfo) {
traceLine = hasLineInfo ? String::format("global code@%s:%d", sourceURL.ascii().data(), line)
: String::format("global code@%s", sourceURL.ascii().data());
} else
traceLine = String::format("global code");
}
return traceLine.impl();
}
};
class TopCallFrameSetter {
public:
TopCallFrameSetter(JSGlobalData& global, CallFrame* callFrame)
: globalData(global)
, oldCallFrame(global.topCallFrame)
{
global.topCallFrame = callFrame;
}
~TopCallFrameSetter()
{
globalData.topCallFrame = oldCallFrame;
}
private:
JSGlobalData& globalData;
CallFrame* oldCallFrame;
};
class NativeCallFrameTracer {
public:
ALWAYS_INLINE NativeCallFrameTracer(JSGlobalData* global, CallFrame* callFrame)
{
ASSERT(global);
ASSERT(callFrame);
global->topCallFrame = callFrame;
}
};
#if PLATFORM(IOS)
enum { MaxLargeThreadReentryDepth = 64, MaxSmallThreadReentryDepth = 16 };
#else
enum { MaxLargeThreadReentryDepth = 256, MaxSmallThreadReentryDepth = 16 };
#endif // PLATFORM(IOS)
class Interpreter {
WTF_MAKE_FAST_ALLOCATED;
friend class CachedCall;
friend class LLIntOffsetsExtractor;
friend class JIT;
public:
Interpreter();
~Interpreter();
void initialize(LLInt::Data*, bool canUseJIT);
RegisterFile& registerFile() { return m_registerFile; }
Opcode getOpcode(OpcodeID id)
{
ASSERT(m_initialized);
#if ENABLE(COMPUTED_GOTO_CLASSIC_INTERPRETER) || ENABLE(LLINT)
return m_opcodeTable[id];
#else
return id;
#endif
}
OpcodeID getOpcodeID(Opcode opcode)
{
ASSERT(m_initialized);
#if ENABLE(LLINT)
ASSERT(isOpcode(opcode));
return m_opcodeIDTable.get(opcode);
#elif ENABLE(COMPUTED_GOTO_CLASSIC_INTERPRETER)
ASSERT(isOpcode(opcode));
if (!m_classicEnabled)
return static_cast<OpcodeID>(bitwise_cast<uintptr_t>(opcode));
return m_opcodeIDTable.get(opcode);
#else
return opcode;
#endif
}
bool classicEnabled()
{
return m_classicEnabled;
}
bool isOpcode(Opcode);
JSValue execute(ProgramExecutable*, CallFrame*, ScopeChainNode*, 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 execute(EvalExecutable*, CallFrame*, JSValue thisValue, ScopeChainNode*);
JSValue execute(EvalExecutable*, CallFrame*, JSValue thisValue, ScopeChainNode*, int globalRegisterOffset);
JSValue retrieveArgumentsFromVMCode(CallFrame*, JSFunction*) const;
JSValue retrieveCallerFromVMCode(CallFrame*, JSFunction*) const;
JS_EXPORT_PRIVATE void retrieveLastCaller(CallFrame*, int& lineNumber, intptr_t& sourceID, UString& sourceURL, JSValue& function) const;
void getArgumentsData(CallFrame*, JSFunction*&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);
SamplingTool* sampler() { return m_sampler.get(); }
NEVER_INLINE HandlerInfo* throwException(CallFrame*&, JSValue&, unsigned bytecodeOffset);
NEVER_INLINE void debug(CallFrame*, DebugHookID, int firstLine, int lastLine);
static const UString getTraceLine(CallFrame*, StackFrameCodeType, const UString&, int);
JS_EXPORT_PRIVATE static void getStackTrace(JSGlobalData*, Vector<StackFrame>& results);
static void addStackTraceIfNecessary(CallFrame*, JSObject* error);
void dumpSampleData(ExecState* exec);
void startSampling();
void stopSampling();
private:
enum ExecutionFlag { Normal, InitializeAndReturn };
CallFrameClosure prepareForRepeatCall(FunctionExecutable*, CallFrame*, JSFunction*, int argumentCountIncludingThis, ScopeChainNode*);
void endRepeatCall(CallFrameClosure&);
JSValue execute(CallFrameClosure&);
#if ENABLE(CLASSIC_INTERPRETER)
NEVER_INLINE bool resolve(CallFrame*, Instruction*, JSValue& exceptionValue);
NEVER_INLINE bool resolveSkip(CallFrame*, Instruction*, JSValue& exceptionValue);
NEVER_INLINE bool resolveGlobal(CallFrame*, Instruction*, JSValue& exceptionValue);
NEVER_INLINE bool resolveGlobalDynamic(CallFrame*, Instruction*, JSValue& exceptionValue);
NEVER_INLINE void resolveBase(CallFrame*, Instruction* vPC);
NEVER_INLINE bool resolveBaseAndProperty(CallFrame*, Instruction*, JSValue& exceptionValue);
NEVER_INLINE bool resolveThisAndProperty(CallFrame*, Instruction*, JSValue& exceptionValue);
NEVER_INLINE ScopeChainNode* createExceptionScope(CallFrame*, const Instruction* vPC);
void tryCacheGetByID(CallFrame*, CodeBlock*, Instruction*, JSValue baseValue, const Identifier& propertyName, const PropertySlot&);
void uncacheGetByID(CodeBlock*, Instruction* vPC);
void tryCachePutByID(CallFrame*, CodeBlock*, Instruction*, JSValue baseValue, const PutPropertySlot&);
void uncachePutByID(CodeBlock*, Instruction* vPC);
#endif // ENABLE(CLASSIC_INTERPRETER)
NEVER_INLINE bool unwindCallFrame(CallFrame*&, JSValue, unsigned& bytecodeOffset, CodeBlock*&);
static ALWAYS_INLINE CallFrame* slideRegisterWindowForCall(CodeBlock*, RegisterFile*, CallFrame*, size_t registerOffset, int argc);
static CallFrame* findFunctionCallFrameFromVMCode(CallFrame*, JSFunction*);
JSValue privateExecute(ExecutionFlag, RegisterFile*, CallFrame*);
void dumpCallFrame(CallFrame*);
void dumpRegisters(CallFrame*);
bool isCallBytecode(Opcode opcode) { return opcode == getOpcode(op_call) || opcode == getOpcode(op_construct) || opcode == getOpcode(op_call_eval); }
void enableSampler();
int m_sampleEntryDepth;
OwnPtr<SamplingTool> m_sampler;
int m_reentryDepth;
RegisterFile m_registerFile;
#if ENABLE(LLINT)
Opcode* m_opcodeTable; HashMap<Opcode, OpcodeID> m_opcodeIDTable; #elif ENABLE(COMPUTED_GOTO_CLASSIC_INTERPRETER)
Opcode m_opcodeTable[numOpcodeIDs]; HashMap<Opcode, OpcodeID> m_opcodeIDTable; #endif
#if !ASSERT_DISABLED
bool m_initialized;
#endif
bool m_classicEnabled;
};
inline bool isValidThisObject(JSValue thisValue, ExecState* exec)
{
return !thisValue.isObject() || thisValue.toThisObject(exec) == thisValue;
}
inline JSValue Interpreter::execute(EvalExecutable* eval, CallFrame* callFrame, JSValue thisValue, ScopeChainNode* scopeChain)
{
return execute(eval, callFrame, thisValue, scopeChain, m_registerFile.size() + 1 + RegisterFile::CallFrameHeaderSize);
}
JSValue eval(CallFrame*);
CallFrame* loadVarargs(CallFrame*, RegisterFile*, JSValue thisValue, JSValue arguments, int firstFreeRegister);
}
#endif // Interpreter_h