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	1	/*
	2	* Copyright (C) 2012, 2013 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	#include "config.h"
	27	#include "LLIntThunks.h"
	28
	29	#include "CallData.h"
	30	#include "ExceptionHelpers.h"
	31	#include "Interpreter.h"
	32	#include "JSCJSValueInlines.h"
	33	#include "JSInterfaceJIT.h"
	34	#include "JSObject.h"
	35	#include "JSStackInlines.h"
	36	#include "LLIntCLoop.h"
	37	#include "LinkBuffer.h"
	38	#include "LowLevelInterpreter.h"
	39	#include "ProtoCallFrame.h"
	40	#include "VM.h"
	41
	42	namespace JSC {
	43
	44	#if ENABLE(JIT)
	45
	46	namespace LLInt {
	47
	48	static MacroAssemblerCodeRef generateThunkWithJumpTo(VM* vm, void (target)(), const char thunkKind)
	49	{
	50	JSInterfaceJIT jit(vm);
	51
	52	// FIXME: there's probably a better way to do it on X86, but I'm not sure I care.
	53	jit.move(JSInterfaceJIT::TrustedImmPtr(bitwise_cast<void*>(target)), JSInterfaceJIT::regT0);
	54	jit.jump(JSInterfaceJIT::regT0);
	55
	56	LinkBuffer patchBuffer(*vm, jit, GLOBAL_THUNK_ID);
	57	return FINALIZE_CODE(patchBuffer, ("LLInt %s prologue thunk", thunkKind));
	58	}
	59
	60	MacroAssemblerCodeRef functionForCallEntryThunkGenerator(VM* vm)
	61	{
	62	return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_function_for_call_prologue), "function for call");
	63	}
	64
	65	MacroAssemblerCodeRef functionForConstructEntryThunkGenerator(VM* vm)
	66	{
	67	return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_function_for_construct_prologue), "function for construct");
	68	}
	69
	70	MacroAssemblerCodeRef functionForCallArityCheckThunkGenerator(VM* vm)
	71	{
	72	return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_function_for_call_arity_check), "function for call with arity check");
	73	}
	74
	75	MacroAssemblerCodeRef functionForConstructArityCheckThunkGenerator(VM* vm)
	76	{
	77	return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_function_for_construct_arity_check), "function for construct with arity check");
	78	}
	79
	80	MacroAssemblerCodeRef evalEntryThunkGenerator(VM* vm)
	81	{
	82	return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_eval_prologue), "eval");
	83	}
	84
	85	MacroAssemblerCodeRef programEntryThunkGenerator(VM* vm)
	86	{
	87	return generateThunkWithJumpTo(vm, LLInt::getCodeFunctionPtr(llint_program_prologue), "program");
	88	}
	89
	90	} // namespace LLInt
	91
	92	#else // ENABLE(JIT)
	93
	94	// Non-JIT (i.e. C Loop LLINT) case:
	95
	96	EncodedJSValue callToJavaScript(void* executableAddress, VM* vm, ProtoCallFrame* protoCallFrame)
	97	{
	98	JSValue result = CLoop::execute(llint_call_to_javascript, executableAddress, vm, protoCallFrame);
	99	return JSValue::encode(result);
	100	}
	101
	102	EncodedJSValue callToNativeFunction(void* executableAddress, VM* vm, ProtoCallFrame* protoCallFrame)
	103	{
	104	JSValue result = CLoop::execute(llint_call_to_native_function, executableAddress, vm, protoCallFrame);
	105	return JSValue::encode(result);
	106	}
	107
	108	#endif // ENABLE(JIT)
	109
	110	} // namespace JSC