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	1	/*
	2	* Copyright (C) 2012 Apple Inc. All rights reserved.
	3	*
	4	* Redistribution and use in source and binary forms, with or without
	5	* modification, are permitted provided that the following conditions
	6	* are met:
	7	* 1. Redistributions of source code must retain the above copyright
	8	* notice, this list of conditions and the following disclaimer.
	9	* 2. Redistributions in binary form must reproduce the above copyright
	10	* notice, this list of conditions and the following disclaimer in the
	11	* documentation and/or other materials provided with the distribution.
	12	*
	13	* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
	14	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	15	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
	16	* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
	17	* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
	18	* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
	19	* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
	20	* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
	21	* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	22	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	23	* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	24	*/
	25
	26	#ifndef JITDriver_h
	27	#define JITDriver_h
	28
	29	#include <wtf/Platform.h>
	30
	31	#if ENABLE(JIT)
	32
	33	#include "BytecodeGenerator.h"
	34	#include "DFGDriver.h"
	35	#include "JIT.h"
	36	#include "LLIntEntrypoints.h"
	37
	38	namespace JSC {
	39
	40	template<typename CodeBlockType>
	41	inline bool jitCompileIfAppropriate(JSGlobalData& globalData, OwnPtr<CodeBlockType>& codeBlock, JITCode& jitCode, JITCode::JITType jitType, JITCompilationEffort effort)
	42	{
	43	if (jitType == codeBlock->getJITType())
	44	return true;
	45
	46	if (!globalData.canUseJIT())
	47	return true;
	48
	49	codeBlock->unlinkIncomingCalls();
	50
	51	JITCode oldJITCode = jitCode;
	52
	53	bool dfgCompiled = false;
	54	if (jitType == JITCode::DFGJIT)
	55	dfgCompiled = DFG::tryCompile(globalData, codeBlock.get(), jitCode);
	56	if (dfgCompiled) {
	57	if (codeBlock->alternative())
	58	codeBlock->alternative()->unlinkIncomingCalls();
	59	} else {
	60	if (codeBlock->alternative()) {
	61	codeBlock = static_pointer_cast<CodeBlockType>(codeBlock->releaseAlternative());
	62	jitCode = oldJITCode;
	63	return false;
	64	}
	65	jitCode = JIT::compile(&globalData, codeBlock.get(), effort);
	66	if (!jitCode) {
	67	jitCode = oldJITCode;
	68	return false;
	69	}
	70	}
	71	codeBlock->setJITCode(jitCode, MacroAssemblerCodePtr());
	72
	73	return true;
	74	}
	75
	76	inline bool jitCompileFunctionIfAppropriate(JSGlobalData& globalData, OwnPtr<FunctionCodeBlock>& codeBlock, JITCode& jitCode, MacroAssemblerCodePtr& jitCodeWithArityCheck, SharedSymbolTable*& symbolTable, JITCode::JITType jitType, JITCompilationEffort effort)
	77	{
	78	if (jitType == codeBlock->getJITType())
	79	return true;
	80
	81	if (!globalData.canUseJIT())
	82	return true;
	83
	84	codeBlock->unlinkIncomingCalls();
	85
	86	JITCode oldJITCode = jitCode;
	87	MacroAssemblerCodePtr oldJITCodeWithArityCheck = jitCodeWithArityCheck;
	88
	89	bool dfgCompiled = false;
	90	if (jitType == JITCode::DFGJIT)
	91	dfgCompiled = DFG::tryCompileFunction(globalData, codeBlock.get(), jitCode, jitCodeWithArityCheck);
	92	if (dfgCompiled) {
	93	if (codeBlock->alternative())
	94	codeBlock->alternative()->unlinkIncomingCalls();
	95	} else {
	96	if (codeBlock->alternative()) {
	97	codeBlock = static_pointer_cast<FunctionCodeBlock>(codeBlock->releaseAlternative());
	98	symbolTable = codeBlock->sharedSymbolTable();
	99	jitCode = oldJITCode;
	100	jitCodeWithArityCheck = oldJITCodeWithArityCheck;
	101	return false;
	102	}
	103	jitCode = JIT::compile(&globalData, codeBlock.get(), effort, &jitCodeWithArityCheck);
	104	if (!jitCode) {
	105	jitCode = oldJITCode;
	106	jitCodeWithArityCheck = oldJITCodeWithArityCheck;
	107	return false;
	108	}
	109	}
	110	codeBlock->setJITCode(jitCode, jitCodeWithArityCheck);
	111
	112	return true;
	113	}
	114
	115	} // namespace JSC
	116
	117	#endif // ENABLE(JIT)
	118
	119	#endif // JITDriver_h
	120