1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
|
/*
* Copyright (C) 2011-2022 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DFGThunks.h"
#if ENABLE(DFG_JIT)
#include "AssemblyHelpersSpoolers.h"
#include "CCallHelpers.h"
#include "DFGJITCode.h"
#include "DFGOSRExit.h"
#include "DFGOSRExitCompilerCommon.h"
#include "FPRInfo.h"
#include "GPRInfo.h"
#include "LinkBuffer.h"
#include "MacroAssembler.h"
#include "ProbeContext.h"
namespace JSC { namespace DFG {
MacroAssemblerCodeRef<JITThunkPtrTag> osrExitGenerationThunkGenerator(VM& vm)
{
CCallHelpers jit(nullptr);
// This needs to happen before we use the scratch buffer because this function also uses the scratch buffer.
adjustFrameAndStackInOSRExitCompilerThunk<DFG::JITCode>(jit, vm, JITType::DFGJIT);
#if USE(JSVALUE64)
jit.store32(GPRInfo::numberTagRegister, &vm.osrExitIndex);
#endif
size_t scratchSize = sizeof(EncodedJSValue) * (GPRInfo::numberOfRegisters + FPRInfo::numberOfRegisters);
ScratchBuffer* scratchBuffer = vm.scratchBufferForSize(scratchSize);
EncodedJSValue* buffer = static_cast<EncodedJSValue*>(scratchBuffer->dataBuffer());
#if CPU(ARM64)
constexpr GPRReg bufferGPR = CCallHelpers::memoryTempRegister;
constexpr unsigned firstGPR = 0;
#elif CPU(X86_64)
GPRReg bufferGPR = jit.scratchRegister();
constexpr unsigned firstGPR = 0;
#else
GPRReg bufferGPR = GPRInfo::toRegister(0);
constexpr unsigned firstGPR = 1;
#endif
if constexpr (firstGPR) {
// We're using the firstGPR as the bufferGPR, and need to save it manually.
RELEASE_ASSERT(GPRInfo::numberOfRegisters >= 1);
RELEASE_ASSERT(bufferGPR == GPRInfo::toRegister(0));
#if USE(JSVALUE64)
jit.store64(bufferGPR, buffer);
#else
jit.store32(bufferGPR, buffer);
#endif
}
jit.move(CCallHelpers::TrustedImmPtr(buffer), bufferGPR);
CCallHelpers::StoreRegSpooler storeSpooler(jit, bufferGPR);
for (unsigned i = firstGPR; i < GPRInfo::numberOfRegisters; ++i) {
ptrdiff_t offset = i * sizeof(CPURegister);
storeSpooler.storeGPR({ GPRInfo::toRegister(i), offset, conservativeWidthWithoutVectors(GPRInfo::toRegister(i)) });
}
storeSpooler.finalizeGPR();
for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
ptrdiff_t offset = (GPRInfo::numberOfRegisters + i) * sizeof(double);
storeSpooler.storeFPR({ FPRInfo::toRegister(i), offset, conservativeWidthWithoutVectors(FPRInfo::toRegister(i)) });
}
storeSpooler.finalizeFPR();
// This will implicitly pass GPRInfo::callFrameRegister as the first argument based on the operation type.
jit.setupArguments<decltype(operationCompileOSRExit)>(bufferGPR);
jit.prepareCallOperation(vm);
jit.callOperation<OperationPtrTag>(operationCompileOSRExit);
jit.move(CCallHelpers::TrustedImmPtr(buffer), bufferGPR);
CCallHelpers::LoadRegSpooler loadSpooler(jit, bufferGPR);
for (unsigned i = firstGPR; i < GPRInfo::numberOfRegisters; ++i) {
ptrdiff_t offset = i * sizeof(CPURegister);
loadSpooler.loadGPR({ GPRInfo::toRegister(i), offset, conservativeWidthWithoutVectors(GPRInfo::toRegister(i)) });
}
loadSpooler.finalizeGPR();
for (unsigned i = 0; i < FPRInfo::numberOfRegisters; ++i) {
ptrdiff_t offset = (GPRInfo::numberOfRegisters + i) * sizeof(double);
loadSpooler.loadFPR({ FPRInfo::toRegister(i), offset, conservativeWidthWithoutVectors(FPRInfo::toRegister(i)) });
}
loadSpooler.finalizeFPR();
if constexpr (firstGPR) {
// We're using the firstGPR as the bufferGPR, and need to restore it manually.
ASSERT(bufferGPR == GPRInfo::toRegister(0));
#if USE(JSVALUE64)
jit.load64(buffer, bufferGPR);
#else
jit.load32(buffer, bufferGPR);
#endif
}
jit.farJump(MacroAssembler::AbsoluteAddress(&vm.osrExitJumpDestination), OSRExitPtrTag);
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::DFGThunk);
return FINALIZE_THUNK(patchBuffer, JITThunkPtrTag, nullptr, "DFG OSR exit generation thunk");
}
MacroAssemblerCodeRef<JITThunkPtrTag> osrEntryThunkGenerator(VM& vm)
{
AssemblyHelpers jit(nullptr);
// We get passed the address of a scratch buffer in GPRInfo::returnValueGPR2.
// The first 8-byte slot of the buffer is the frame size. The second 8-byte slot
// is the pointer to where we are supposed to jump. The remaining bytes are
// the new call frame header followed by the locals.
ptrdiff_t offsetOfFrameSize = 0; // This is the DFG frame count.
ptrdiff_t offsetOfTargetPC = offsetOfFrameSize + sizeof(EncodedJSValue);
ptrdiff_t offsetOfPayload = offsetOfTargetPC + sizeof(EncodedJSValue);
ptrdiff_t offsetOfLocals = offsetOfPayload + sizeof(Register) * CallFrame::headerSizeInRegisters;
jit.move(GPRInfo::returnValueGPR2, GPRInfo::regT0);
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfFrameSize), GPRInfo::regT1); // Load the frame size.
jit.negPtr(GPRInfo::regT1, GPRInfo::regT2);
jit.getEffectiveAddress(MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT2, MacroAssembler::TimesEight), MacroAssembler::stackPointerRegister);
// Copying locals and header from scratch buffer to the new CallFrame. This also replaces
MacroAssembler::Label loop = jit.label();
jit.subPtr(MacroAssembler::TrustedImm32(1), GPRInfo::regT1);
jit.negPtr(GPRInfo::regT1, GPRInfo::regT4);
jit.loadValue(MacroAssembler::BaseIndex(GPRInfo::regT0, GPRInfo::regT1, MacroAssembler::TimesEight, offsetOfLocals), JSRInfo::jsRegT32);
jit.storeValue(JSRInfo::jsRegT32, MacroAssembler::BaseIndex(GPRInfo::callFrameRegister, GPRInfo::regT4, MacroAssembler::TimesEight, -static_cast<intptr_t>(sizeof(Register))));
jit.branchPtr(MacroAssembler::NotEqual, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(std::bit_cast<void*>(-static_cast<intptr_t>(CallFrame::headerSizeInRegisters)))).linkTo(loop, &jit);
jit.loadPtr(MacroAssembler::Address(GPRInfo::regT0, offsetOfTargetPC), GPRInfo::regT1);
MacroAssembler::Jump ok = jit.branchPtr(MacroAssembler::Above, GPRInfo::regT1, MacroAssembler::TrustedImmPtr(std::bit_cast<void*>(static_cast<intptr_t>(1000))));
jit.abortWithReason(DFGUnreasonableOSREntryJumpDestination);
ok.link(&jit);
jit.jitAssertCodeBlockOnCallFrameIsOptimizingJIT(GPRInfo::regT2);
jit.restoreCalleeSavesFromEntryFrameCalleeSavesBuffer(vm.topEntryFrame);
jit.emitMaterializeTagCheckRegisters();
#if USE(JSVALUE64)
jit.emitGetFromCallFrameHeaderPtr(CallFrameSlot::codeBlock, GPRInfo::jitDataRegister);
jit.loadPtr(CCallHelpers::Address(GPRInfo::jitDataRegister, CodeBlock::offsetOfJITData()), GPRInfo::jitDataRegister);
#endif
jit.farJump(GPRInfo::regT1, GPRInfo::callFrameRegister);
LinkBuffer patchBuffer(jit, GLOBAL_THUNK_ID, LinkBuffer::Profile::DFGOSREntry);
return FINALIZE_THUNK(patchBuffer, JITThunkPtrTag, nullptr, "DFG OSR entry thunk");
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)
|
