ftl/FTLJITCode.cpp

   1 /*
   2  * Copyright (C) 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 "FTLJITCode.h"
  28
  29 #if ENABLE(FTL_JIT)
  30
  31 namespace JSC { namespace FTL {
  32
  33 JITCode::JITCode()
  34     : JSC::JITCode(FTLJIT)
  35 {
  36 }
  37
  38 JITCode::~JITCode()
  39 {
  40 }
  41
  42 void JITCode::initializeExitThunks(CodeRef exitThunks)
  43 {
  44     m_exitThunks = exitThunks;
  45 }
  46
  47 void JITCode::addHandle(PassRefPtr<ExecutableMemoryHandle> handle)
  48 {
  49     m_handles.append(handle);
  50 }
  51
  52 void JITCode::addDataSection(PassRefPtr<DataSection> dataSection)
  53 {
  54     m_dataSections.append(dataSection);
  55 }
  56
  57 void JITCode::initializeArityCheckEntrypoint(CodeRef entrypoint)
  58 {
  59     m_arityCheckEntrypoint = entrypoint;
  60 }
  61
  62 void JITCode::initializeAddressForCall(CodePtr address)
  63 {
  64     m_addressForCall = address;
  65 }
  66
  67 JITCode::CodePtr JITCode::addressForCall(VM&, ExecutableBase*, ArityCheckMode arityCheck, RegisterPreservationMode)
  68 {
  69     switch (arityCheck) {
  70     case ArityCheckNotRequired:
  71         return m_addressForCall;
  72     case MustCheckArity:
  73         return m_arityCheckEntrypoint.code();
  74     }
  75     RELEASE_ASSERT_NOT_REACHED();
  76     return CodePtr();
  77 }
  78
  79 void* JITCode::executableAddressAtOffset(size_t offset)
  80 {
  81     return reinterpret_cast<char*>(m_addressForCall.executableAddress()) + offset;
  82 }
  83
  84 void* JITCode::dataAddressAtOffset(size_t)
  85 {
  86     // We can't patch FTL code, yet. Even if we did, it's not clear that we would do so
  87     // through this API.
  88     RELEASE_ASSERT_NOT_REACHED();
  89     return 0;
  90 }
  91
  92 unsigned JITCode::offsetOf(void*)
  93 {
  94     // We currently don't have visibility into the FTL code.
  95     RELEASE_ASSERT_NOT_REACHED();
  96     return 0;
  97 }
  98
  99 size_t JITCode::size()
 100 {
 101     // We don't know the size of FTL code, yet. Make a wild guess. This is mostly used for
 102     // GC load estimates.
 103     return 1000;
 104 }
 105
 106 bool JITCode::contains(void*)
 107 {
 108     // We have no idea what addresses the FTL code contains, yet.
 109     RELEASE_ASSERT_NOT_REACHED();
 110     return false;
 111 }
 112
 113 JITCode::CodePtr JITCode::exitThunks()
 114 {
 115     return m_exitThunks.code();
 116 }
 117
 118 JITCode* JITCode::ftl()
 119 {
 120     return this;
 121 }
 122
 123 DFG::CommonData* JITCode::dfgCommon()
 124 {
 125     return &common;
 126 }
 127
 128 } } // namespace JSC::FTL
 129
 130 #endif // ENABLE(FTL_JIT)
 131