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: 2012-06-02 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           11826 : TrampolineCompiler::compile()
      67                 : {
      68                 : #ifdef JS_METHODJIT_SPEW
      69           11826 :     JMCheckLogging();
      70                 : #endif
      71                 : 
      72           11826 :     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           11826 :     return true;
      78                 : }
      79                 : 
      80                 : void
      81           11826 : TrampolineCompiler::release(Trampolines *tramps)
      82                 : {
      83           11826 :     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           11826 : }
      88                 : 
      89                 : bool
      90           11826 : TrampolineCompiler::compileTrampoline(Trampolines::TrampolinePtr *where,
      91                 :                                       JSC::ExecutablePool **poolp, TrampolineGenerator generator)
      92                 : {
      93           23652 :     Assembler masm;
      94                 : 
      95           11826 :     Label entry = masm.label();
      96           11826 :     CHECK_RESULT(generator(masm));
      97           11826 :     JS_ASSERT(entry.isSet());
      98                 : 
      99                 :     bool ok;
     100           23652 :     JSC::LinkBuffer buffer(&masm, execAlloc, poolp, &ok, JSC::METHOD_CODE);
     101           11826 :     if (!ok) 
     102               0 :         return false;
     103           11826 :     masm.finalize(buffer);
     104           11826 :     uint8_t *result = (uint8_t*)buffer.finalizeCodeAddendum().dataLocation();
     105           11826 :     *where = JS_DATA_TO_FUNC_PTR(Trampolines::TrampolinePtr, result + masm.distanceOf(entry));
     106                 : 
     107           11826 :     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           11826 : TrampolineCompiler::generateForceReturn(Assembler &masm)
     120                 : {
     121                 :     /* The JSStackFrame register may have been clobbered while returning, reload it. */
     122           11826 :     masm.loadPtr(FrameAddress(VMFrame::offsetOfFp), JSFrameReg);
     123                 : 
     124                 :     /* Perform the frame epilogue. */
     125           11826 :     masm.fallibleVMCall(true, JS_FUNC_TO_DATA_PTR(void *, stubs::AnyFrameEpilogue), NULL, NULL, 0);
     126                 : 
     127                 :     /* Store any known return value */
     128           11826 :     masm.loadValueAsComponents(UndefinedValue(), JSReturnReg_Type, JSReturnReg_Data);
     129                 :     Jump rvalClear = masm.branchTest32(Assembler::Zero,
     130           11826 :                                        FrameFlagsAddress(), Imm32(StackFrame::HAS_RVAL));
     131           11826 :     Address rvalAddress(JSFrameReg, StackFrame::offsetOfReturnValue());
     132           11826 :     masm.loadValueAsComponents(rvalAddress, JSReturnReg_Type, JSReturnReg_Data);
     133           11826 :     rvalClear.linkTo(masm.label(), &masm);
     134                 : 
     135                 :     /* Return to the caller */
     136           11826 :     masm.loadPtr(Address(JSFrameReg, StackFrame::offsetOfNcode()), Registers::ReturnReg);
     137           11826 :     masm.jump(Registers::ReturnReg);
     138           11826 :     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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