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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
* vim: set ts=4 sw=4 et tw=99:
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Jaegermonkey.
*
* The Initial Developer of the Original Code is the Mozilla Foundation.
*
* Portions created by the Initial Developer are Copyright (C) 2010
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Andrew Drake <drakedevel@gmail.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#include "TrampolineCompiler.h"
#include "StubCalls.h"
#include "assembler/assembler/LinkBuffer.h"
namespace js {
namespace mjit {
#define CHECK_RESULT(x) if (!(x)) return false
#define COMPILE(which, pool, how) CHECK_RESULT(compileTrampoline(&(which), &pool, how))
#define RELEASE(which, pool) JS_BEGIN_MACRO \
which = NULL; \
if (pool) \
pool->release(); \
pool = NULL; \
JS_END_MACRO
typedef JSC::MacroAssembler::Address Address;
typedef JSC::MacroAssembler::Label Label;
typedef JSC::MacroAssembler::Jump Jump;
typedef JSC::MacroAssembler::ImmPtr ImmPtr;
typedef JSC::MacroAssembler::Imm32 Imm32;
typedef JSC::MacroAssembler::Address Address;
bool
TrampolineCompiler::compile()
{
#ifdef JS_METHODJIT_SPEW
JMCheckLogging();
#endif
COMPILE(trampolines->forceReturn, trampolines->forceReturnPool, generateForceReturn);
#if (defined(JS_NO_FASTCALL) && defined(JS_CPU_X86)) || defined(_WIN64)
COMPILE(trampolines->forceReturnFast, trampolines->forceReturnFastPool, generateForceReturnFast);
#endif
return true;
}
void
TrampolineCompiler::release(Trampolines *tramps)
{
RELEASE(tramps->forceReturn, tramps->forceReturnPool);
#if (defined(JS_NO_FASTCALL) && defined(JS_CPU_X86)) || defined(_WIN64)
RELEASE(tramps->forceReturnFast, tramps->forceReturnFastPool);
#endif
}
bool
TrampolineCompiler::compileTrampoline(Trampolines::TrampolinePtr *where, JSC::ExecutablePool **pool,
TrampolineGenerator generator)
{
Assembler masm;
Label entry = masm.label();
CHECK_RESULT(generator(masm));
JS_ASSERT(entry.isValid());
*pool = execPool->poolForSize(masm.size());
if (!*pool)
return false;
JSC::LinkBuffer buffer(&masm, *pool);
masm.finalize(buffer);
uint8 *result = (uint8*)buffer.finalizeCodeAddendum().dataLocation();
*where = JS_DATA_TO_FUNC_PTR(Trampolines::TrampolinePtr, result + masm.distanceOf(entry));
return true;
}
/*
* This is shamelessly copied from emitReturn, but with several changes:
* - There was always at least one inline call.
* - We don't know if there is a call object, so we always check.
* - We don't know where we came from, so we don't know frame depth or PC.
* - There is no stub buffer.
*/
bool
TrampolineCompiler::generateForceReturn(Assembler &masm)
{
/* if (hasArgsObj() || hasCallObj()) stubs::PutActivationObjects() */
Jump noActObjs = masm.branchTest32(Assembler::Zero, FrameFlagsAddress(),
Imm32(JSFRAME_HAS_CALL_OBJ | JSFRAME_HAS_ARGS_OBJ));
masm.fallibleVMCall(JS_FUNC_TO_DATA_PTR(void *, stubs::PutActivationObjects), NULL, 0);
noActObjs.linkTo(masm.label(), &masm);
/* Store any known return value */
masm.loadValueAsComponents(UndefinedValue(), JSReturnReg_Type, JSReturnReg_Data);
Jump rvalClear = masm.branchTest32(Assembler::Zero,
FrameFlagsAddress(), Imm32(JSFRAME_HAS_RVAL));
Address rvalAddress(JSFrameReg, JSStackFrame::offsetOfReturnValue());
masm.loadValueAsComponents(rvalAddress, JSReturnReg_Type, JSReturnReg_Data);
rvalClear.linkTo(masm.label(), &masm);
/* Return to the caller */
masm.loadPtr(Address(JSFrameReg, JSStackFrame::offsetOfncode()), Registers::ReturnReg);
masm.jump(Registers::ReturnReg);
return true;
}
#if (defined(JS_NO_FASTCALL) && defined(JS_CPU_X86)) || defined(_WIN64)
bool
TrampolineCompiler::generateForceReturnFast(Assembler &masm)
{
#ifdef _WIN64
masm.addPtr(Imm32(32), Registers::StackPointer);
#else
// In case of no fast call, when we change the return address,
// we need to make sure add esp by 8.
masm.addPtr(Imm32(16), Registers::StackPointer);
#endif
return generateForceReturn(masm);
}
#endif
} /* namespace mjit */
} /* namespace js */
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