1/*
2 * Copyright (C) 2013-2018 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#include "FTLState.h"
32#include "JSCPtrTag.h"
33
34namespace JSC { namespace FTL {
35
36using namespace B3;
37
38JITCode::JITCode()
39 : JSC::JITCode(JITType::FTLJIT)
40{
41}
42
43JITCode::~JITCode()
44{
45 if (FTL::shouldDumpDisassembly()) {
46 dataLog("Destroying FTL JIT code at ");
47 CommaPrinter comma;
48 dataLog(comma, m_b3Code);
49 dataLog(comma, m_arityCheckEntrypoint);
50 dataLog("\n");
51 }
52}
53
54void JITCode::initializeB3Code(CodeRef<JSEntryPtrTag> b3Code)
55{
56 m_b3Code = b3Code;
57}
58
59void JITCode::initializeB3Byproducts(std::unique_ptr<OpaqueByproducts> byproducts)
60{
61 m_b3Byproducts = WTFMove(byproducts);
62}
63
64void JITCode::initializeAddressForCall(CodePtr<JSEntryPtrTag> address)
65{
66 m_addressForCall = address;
67}
68
69void JITCode::initializeArityCheckEntrypoint(CodeRef<JSEntryPtrTag> entrypoint)
70{
71 m_arityCheckEntrypoint = entrypoint;
72}
73
74JITCode::CodePtr<JSEntryPtrTag> JITCode::addressForCall(ArityCheckMode arityCheck)
75{
76 switch (arityCheck) {
77 case ArityCheckNotRequired:
78 return m_addressForCall;
79 case MustCheckArity:
80 return m_arityCheckEntrypoint.code();
81 }
82 RELEASE_ASSERT_NOT_REACHED();
83 return CodePtr<JSEntryPtrTag>();
84}
85
86void* JITCode::executableAddressAtOffset(size_t offset)
87{
88 if (!offset)
89 return m_addressForCall.executableAddress();
90
91 char* executableAddress = m_addressForCall.untaggedExecutableAddress<char*>();
92 return tagCodePtr<JSEntryPtrTag>(executableAddress + offset);
93}
94
95void* JITCode::dataAddressAtOffset(size_t)
96{
97 // We can't patch FTL code, yet. Even if we did, it's not clear that we would do so
98 // through this API.
99 RELEASE_ASSERT_NOT_REACHED();
100 return 0;
101}
102
103unsigned JITCode::offsetOf(void*)
104{
105 // We currently don't have visibility into the FTL code.
106 RELEASE_ASSERT_NOT_REACHED();
107 return 0;
108}
109
110size_t JITCode::size()
111{
112 // We don't know the size of FTL code, yet. Make a wild guess. This is mostly used for
113 // GC load estimates.
114 return 1000;
115}
116
117bool JITCode::contains(void*)
118{
119 // We have no idea what addresses the FTL code contains, yet.
120 RELEASE_ASSERT_NOT_REACHED();
121 return false;
122}
123
124JITCode* JITCode::ftl()
125{
126 return this;
127}
128
129DFG::CommonData* JITCode::dfgCommon()
130{
131 return &common;
132}
133
134void JITCode::validateReferences(const TrackedReferences& trackedReferences)
135{
136 common.validateReferences(trackedReferences);
137
138 for (OSRExit& exit : osrExit)
139 exit.m_descriptor->validateReferences(trackedReferences);
140}
141
142RegisterSet JITCode::liveRegistersToPreserveAtExceptionHandlingCallSite(CodeBlock*, CallSiteIndex callSiteIndex)
143{
144 for (OSRExit& exit : osrExit) {
145 if (exit.m_exceptionHandlerCallSiteIndex.bits() == callSiteIndex.bits()) {
146 RELEASE_ASSERT(exit.isExceptionHandler());
147 RELEASE_ASSERT(exit.isGenericUnwindHandler());
148 return ValueRep::usedRegisters(exit.m_valueReps);
149 }
150 }
151 return { };
152}
153
154Optional<CodeOrigin> JITCode::findPC(CodeBlock* codeBlock, void* pc)
155{
156 for (OSRExit& exit : osrExit) {
157 if (ExecutableMemoryHandle* handle = exit.m_code.executableMemory()) {
158 if (handle->start().untaggedPtr() <= pc && pc < handle->end().untaggedPtr())
159 return Optional<CodeOrigin>(exit.m_codeOriginForExitProfile);
160 }
161 }
162
163 for (std::unique_ptr<LazySlowPath>& lazySlowPath : lazySlowPaths) {
164 if (ExecutableMemoryHandle* handle = lazySlowPath->stub().executableMemory()) {
165 if (handle->start().untaggedPtr() <= pc && pc < handle->end().untaggedPtr())
166 return Optional<CodeOrigin>(codeBlock->codeOrigin(lazySlowPath->callSiteIndex()));
167 }
168 }
169
170 return WTF::nullopt;
171}
172
173} } // namespace JSC::FTL
174
175#endif // ENABLE(FTL_JIT)
176
177