/js/src/methodjit/TrampolineCompiler.cpp
http://github.com/zpao/v8monkey · C++ · 158 lines · 86 code · 19 blank · 53 comment · 9 complexity · d875fd01be47497e735997b4f0b1fd87 MD5 · raw file
- /* -*- 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"
- #include "assembler/jit/ExecutableAllocator.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 **poolp, TrampolineGenerator generator)
- {
- Assembler masm;
- Label entry = masm.label();
- CHECK_RESULT(generator(masm));
- JS_ASSERT(entry.isSet());
- bool ok;
- JSC::LinkBuffer buffer(&masm, execAlloc, poolp, &ok, JSC::METHOD_CODE);
- if (!ok)
- return false;
- masm.finalize(buffer);
- uint8_t *result = (uint8_t*)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 are activation objects or a script with nesting
- * state whose active frames need adjustment, so we always stub the epilogue.
- * - 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)
- {
- /* The JSStackFrame register may have been clobbered while returning, reload it. */
- masm.loadPtr(FrameAddress(VMFrame::offsetOfFp), JSFrameReg);
- /* Perform the frame epilogue. */
- masm.fallibleVMCall(true, JS_FUNC_TO_DATA_PTR(void *, stubs::AnyFrameEpilogue), NULL, NULL, 0);
- /* Store any known return value */
- masm.loadValueAsComponents(UndefinedValue(), JSReturnReg_Type, JSReturnReg_Data);
- Jump rvalClear = masm.branchTest32(Assembler::Zero,
- FrameFlagsAddress(), Imm32(StackFrame::HAS_RVAL));
- Address rvalAddress(JSFrameReg, StackFrame::offsetOfReturnValue());
- masm.loadValueAsComponents(rvalAddress, JSReturnReg_Type, JSReturnReg_Data);
- rvalClear.linkTo(masm.label(), &masm);
- /* Return to the caller */
- masm.loadPtr(Address(JSFrameReg, StackFrame::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 */