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/*
* Copyright (C) 2008 Apple Inc. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 INC. OR
* 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 JITCode_h
#define JITCode_h
#if ENABLE(JIT)
#include "CallFrame.h"
#include "JSValue.h"
#include "Disassembler.h"
#include "MacroAssemblerCodeRef.h"
#include "Profiler.h"
#endif
namespace JSC {
#if ENABLE(JIT)
class JSGlobalData;
class RegisterFile;
#endif
class JITCode {
#if ENABLE(JIT)
typedef MacroAssemblerCodeRef CodeRef;
typedef MacroAssemblerCodePtr CodePtr;
#else
JITCode() { }
#endif
public:
enum JITType { None, HostCallThunk, InterpreterThunk, BaselineJIT, DFGJIT };
static JITType bottomTierJIT()
{
return BaselineJIT;
}
static JITType topTierJIT()
{
return DFGJIT;
}
static JITType nextTierJIT(JITType jitType)
{
ASSERT_UNUSED(jitType, jitType == BaselineJIT || jitType == DFGJIT);
return DFGJIT;
}
static bool isOptimizingJIT(JITType jitType)
{
return jitType == DFGJIT;
}
static bool isBaselineCode(JITType jitType)
{
return jitType == InterpreterThunk || jitType == BaselineJIT;
}
#if ENABLE(JIT)
JITCode()
: m_jitType(None)
{
}
JITCode(const CodeRef ref, JITType jitType)
: m_ref(ref)
, m_jitType(jitType)
{
ASSERT(jitType != None);
}
bool operator !() const
{
return !m_ref;
}
CodePtr addressForCall()
{
return m_ref.code();
}
void* executableAddressAtOffset(size_t offset) const
{
ASSERT(offset < size());
return reinterpret_cast<char*>(m_ref.code().executableAddress()) + offset;
}
void* executableAddress() const
{
return executableAddressAtOffset(0);
}
void* dataAddressAtOffset(size_t offset) const
{
ASSERT(offset <= size()); // use <= instead of < because it is valid to ask for an address at the exclusive end of the code.
return reinterpret_cast<char*>(m_ref.code().dataLocation()) + offset;
}
// This function returns the offset in bytes of 'pointerIntoCode' into
// this block of code. The pointer provided must be a pointer into this
// block of code. It is ASSERTed that no codeblock >4gb in size.
unsigned offsetOf(void* pointerIntoCode)
{
intptr_t result = reinterpret_cast<intptr_t>(pointerIntoCode) - reinterpret_cast<intptr_t>(m_ref.code().executableAddress());
ASSERT(static_cast<intptr_t>(static_cast<unsigned>(result)) == result);
return static_cast<unsigned>(result);
}
// Execute the code!
inline JSValue execute(RegisterFile* registerFile, CallFrame* callFrame, JSGlobalData* globalData)
{
JSValue result = JSValue::decode(ctiTrampoline(m_ref.code().executableAddress(), registerFile, callFrame, 0, 0, globalData));
return globalData->exception ? jsNull() : result;
}
void* start() const
{
return m_ref.code().dataLocation();
}
size_t size() const
{
ASSERT(m_ref.code().executableAddress());
return m_ref.size();
}
bool tryToDisassemble(const char* prefix) const
{
return m_ref.tryToDisassemble(prefix);
}
ExecutableMemoryHandle* getExecutableMemory()
{
return m_ref.executableMemory();
}
JITType jitType()
{
return m_jitType;
}
// Host functions are a bit special; they have a m_code pointer but they
// do not individully ref the executable pool containing the trampoline.
static JITCode HostFunction(CodeRef code)
{
return JITCode(code, HostCallThunk);
}
void clear()
{
m_ref.~CodeRef();
new (NotNull, &m_ref) CodeRef();
}
private:
JITCode(PassRefPtr<ExecutableMemoryHandle> executableMemory, JITType jitType)
: m_ref(executableMemory)
, m_jitType(jitType)
{
}
CodeRef m_ref;
JITType m_jitType;
#endif // ENABLE(JIT)
};
};
#endif
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