LCOV - app.info - js/src/methodjit/TrampolineCompiler.cpp

LCOV - code coverage report
| Current view: | directory - js/src/methodjit - TrampolineCompiler.cpp (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 30 | 29 | 96.7 %
| Date: | 2012-04-07 | Functions: | 4 | 4 | 100.0 %

           1                 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
           2                 :  * vim: set ts=4 sw=4 et tw=99:
           3                 :  *
           4                 :  * ***** BEGIN LICENSE BLOCK *****
           5                 :  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
           6                 :  *
           7                 :  * The contents of this file are subject to the Mozilla Public License Version
           8                 :  * 1.1 (the "License"); you may not use this file except in compliance with
           9                 :  * the License. You may obtain a copy of the License at
          10                 :  * http://www.mozilla.org/MPL/
          11                 :  *
          12                 :  * Software distributed under the License is distributed on an "AS IS" basis,
          13                 :  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
          14                 :  * for the specific language governing rights and limitations under the
          15                 :  * License.
          16                 :  *
          17                 :  * The Original Code is Mozilla Jaegermonkey.
          18                 :  *
          19                 :  * The Initial Developer of the Original Code is the Mozilla Foundation.
          20                 :  *
          21                 :  * Portions created by the Initial Developer are Copyright (C) 2010
          22                 :  * the Initial Developer. All Rights Reserved.
          23                 :  *
          24                 :  * Contributor(s):
          25                 :  *   Andrew Drake <drakedevel@gmail.com>
          26                 :  *
          27                 :  * Alternatively, the contents of this file may be used under the terms of
          28                 :  * either the GNU General Public License Version 2 or later (the "GPL"), or
          29                 :  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
          30                 :  * in which case the provisions of the GPL or the LGPL are applicable instead
          31                 :  * of those above. If you wish to allow use of your version of this file only
          32                 :  * under the terms of either the GPL or the LGPL, and not to allow others to
          33                 :  * use your version of this file under the terms of the MPL, indicate your
          34                 :  * decision by deleting the provisions above and replace them with the notice
          35                 :  * and other provisions required by the GPL or the LGPL. If you do not delete
          36                 :  * the provisions above, a recipient may use your version of this file under
          37                 :  * the terms of any one of the MPL, the GPL or the LGPL.
          38                 :  *
          39                 :  * ***** END LICENSE BLOCK ***** */
          40                 :
          41                 : #include "TrampolineCompiler.h"
          42                 : #include "StubCalls.h"
          43                 : #include "assembler/assembler/LinkBuffer.h"
          44                 : #include "assembler/jit/ExecutableAllocator.h"
          45                 :
          46                 : namespace js {
          47                 : namespace mjit {
          48                 :
          49                 : #define CHECK_RESULT(x) if (!(x)) return false
          50                 : #define COMPILE(which, pool, how) CHECK_RESULT(compileTrampoline(&(which), &pool, how))
          51                 : #define RELEASE(which, pool) JS_BEGIN_MACRO \
          52                 :     which = NULL;                           \
          53                 :     if (pool)                               \
          54                 :         pool->release();                    \
          55                 :     pool = NULL;                            \
          56                 : JS_END_MACRO
          57                 :
          58                 : typedef JSC::MacroAssembler::Address Address;
          59                 : typedef JSC::MacroAssembler::Label Label;
          60                 : typedef JSC::MacroAssembler::Jump Jump;
          61                 : typedef JSC::MacroAssembler::ImmPtr ImmPtr;
          62                 : typedef JSC::MacroAssembler::Imm32 Imm32;
          63                 : typedef JSC::MacroAssembler::Address Address;
          64                 :
          65                 : bool
          66           10990 : TrampolineCompiler::compile()
          67                 : {
          68                 : #ifdef JS_METHODJIT_SPEW
          69           10990 :     JMCheckLogging();
          70                 : #endif
          71                 :
          72           10990 :     COMPILE(trampolines->forceReturn, trampolines->forceReturnPool, generateForceReturn);
          73                 : #if (defined(JS_NO_FASTCALL) && defined(JS_CPU_X86)) || defined(_WIN64)
          74                 :     COMPILE(trampolines->forceReturnFast, trampolines->forceReturnFastPool, generateForceReturnFast);
          75                 : #endif
          76                 :
          77           10990 :     return true;
          78                 : }
          79                 :
          80                 : void
          81           10990 : TrampolineCompiler::release(Trampolines *tramps)
          82                 : {
          83           10990 :     RELEASE(tramps->forceReturn, tramps->forceReturnPool);
          84                 : #if (defined(JS_NO_FASTCALL) && defined(JS_CPU_X86)) || defined(_WIN64)
          85                 :     RELEASE(tramps->forceReturnFast, tramps->forceReturnFastPool);
          86                 : #endif
          87           10990 : }
          88                 :
          89                 : bool
          90           10990 : TrampolineCompiler::compileTrampoline(Trampolines::TrampolinePtr *where,
          91                 :                                       JSC::ExecutablePool **poolp, TrampolineGenerator generator)
          92                 : {
          93           21980 :     Assembler masm;
          94                 :
          95           10990 :     Label entry = masm.label();
          96           10990 :     CHECK_RESULT(generator(masm));
          97           10990 :     JS_ASSERT(entry.isSet());
          98                 :
          99                 :     bool ok;
         100           21980 :     JSC::LinkBuffer buffer(&masm, execAlloc, poolp, &ok, JSC::METHOD_CODE);
         101           10990 :     if (!ok)
         102               0 :         return false;
         103           10990 :     masm.finalize(buffer);
         104           10990 :     uint8_t *result = (uint8_t*)buffer.finalizeCodeAddendum().dataLocation();
         105           10990 :     *where = JS_DATA_TO_FUNC_PTR(Trampolines::TrampolinePtr, result + masm.distanceOf(entry));
         106                 :
         107           10990 :     return true;
         108                 : }
         109                 :
         110                 : /*
         111                 :  * This is shamelessly copied from emitReturn, but with several changes:
         112                 :  * - There was always at least one inline call.
         113                 :  * - We don't know if there are activation objects or a script with nesting
         114                 :  *   state whose active frames need adjustment, so we always stub the epilogue.
         115                 :  * - We don't know where we came from, so we don't know frame depth or PC.
         116                 :  * - There is no stub buffer.
         117                 :  */
         118                 : bool
         119           10990 : TrampolineCompiler::generateForceReturn(Assembler &masm)
         120                 : {
         121                 :     /* The JSStackFrame register may have been clobbered while returning, reload it. */
         122           10990 :     masm.loadPtr(FrameAddress(VMFrame::offsetOfFp), JSFrameReg);
         123                 :
         124                 :     /* Perform the frame epilogue. */
         125           10990 :     masm.fallibleVMCall(true, JS_FUNC_TO_DATA_PTR(void *, stubs::AnyFrameEpilogue), NULL, NULL, 0);
         126                 :
         127                 :     /* Store any known return value */
         128           10990 :     masm.loadValueAsComponents(UndefinedValue(), JSReturnReg_Type, JSReturnReg_Data);
         129                 :     Jump rvalClear = masm.branchTest32(Assembler::Zero,
         130           10990 :                                        FrameFlagsAddress(), Imm32(StackFrame::HAS_RVAL));
         131           10990 :     Address rvalAddress(JSFrameReg, StackFrame::offsetOfReturnValue());
         132           10990 :     masm.loadValueAsComponents(rvalAddress, JSReturnReg_Type, JSReturnReg_Data);
         133           10990 :     rvalClear.linkTo(masm.label(), &masm);
         134                 :
         135                 :     /* Return to the caller */
         136           10990 :     masm.loadPtr(Address(JSFrameReg, StackFrame::offsetOfNcode()), Registers::ReturnReg);
         137           10990 :     masm.jump(Registers::ReturnReg);
         138           10990 :     return true;
         139                 : }
         140                 :
         141                 : #if (defined(JS_NO_FASTCALL) && defined(JS_CPU_X86)) || defined(_WIN64)
         142                 : bool
         143                 : TrampolineCompiler::generateForceReturnFast(Assembler &masm)
         144                 : {
         145                 : #ifdef _WIN64
         146                 :     masm.addPtr(Imm32(32), Registers::StackPointer);
         147                 : #else
         148                 :     // In case of no fast call, when we change the return address,
         149                 :     // we need to make sure add esp by 8.
         150                 :     masm.addPtr(Imm32(16), Registers::StackPointer);
         151                 : #endif
         152                 :     return generateForceReturn(masm);
         153                 : }
         154                 : #endif
         155                 :
         156                 : } /* namespace mjit */
         157                 : } /* namespace js */
         158                 :

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