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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
|
//===- DWARFEmitterImpl.cpp -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "DWARFEmitterImpl.h"
#include "DWARFLinkerCompileUnit.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/MC/MCTargetOptionsCommandFlags.h"
#include "llvm/MC/TargetRegistry.h"
#include "llvm/Support/FormattedStream.h"
using namespace llvm;
using namespace dwarf_linker;
using namespace dwarf_linker::parallel;
Error DwarfEmitterImpl::init(Triple TheTriple,
StringRef Swift5ReflectionSegmentName) {
std::string ErrorStr;
std::string TripleName;
// Get the target.
const Target *TheTarget =
TargetRegistry::lookupTarget(TripleName, TheTriple, ErrorStr);
if (!TheTarget)
return createStringError(std::errc::invalid_argument, ErrorStr.c_str());
TripleName = TheTriple.getTriple();
// Create all the MC Objects.
MRI.reset(TheTarget->createMCRegInfo(TripleName));
if (!MRI)
return createStringError(std::errc::invalid_argument,
"no register info for target %s",
TripleName.c_str());
MCTargetOptions MCOptions = mc::InitMCTargetOptionsFromFlags();
MAI.reset(TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
if (!MAI)
return createStringError(std::errc::invalid_argument,
"no asm info for target %s", TripleName.c_str());
MSTI.reset(TheTarget->createMCSubtargetInfo(TripleName, "", ""));
if (!MSTI)
return createStringError(std::errc::invalid_argument,
"no subtarget info for target %s",
TripleName.c_str());
MC.reset(new MCContext(TheTriple, MAI.get(), MRI.get(), MSTI.get(), nullptr,
nullptr, true, Swift5ReflectionSegmentName));
MOFI.reset(TheTarget->createMCObjectFileInfo(*MC, /*PIC=*/false, false));
MC->setObjectFileInfo(MOFI.get());
MAB = TheTarget->createMCAsmBackend(*MSTI, *MRI, MCOptions);
if (!MAB)
return createStringError(std::errc::invalid_argument,
"no asm backend for target %s",
TripleName.c_str());
MII.reset(TheTarget->createMCInstrInfo());
if (!MII)
return createStringError(std::errc::invalid_argument,
"no instr info info for target %s",
TripleName.c_str());
MCE = TheTarget->createMCCodeEmitter(*MII, *MC);
if (!MCE)
return createStringError(std::errc::invalid_argument,
"no code emitter for target %s",
TripleName.c_str());
switch (OutFileType) {
case DWARFLinker::OutputFileType::Assembly: {
MIP = TheTarget->createMCInstPrinter(TheTriple, MAI->getAssemblerDialect(),
*MAI, *MII, *MRI);
MS = TheTarget->createAsmStreamer(
*MC, std::make_unique<formatted_raw_ostream>(OutFile), true, true, MIP,
std::unique_ptr<MCCodeEmitter>(MCE), std::unique_ptr<MCAsmBackend>(MAB),
true);
break;
}
case DWARFLinker::OutputFileType::Object: {
MS = TheTarget->createMCObjectStreamer(
TheTriple, *MC, std::unique_ptr<MCAsmBackend>(MAB),
MAB->createObjectWriter(OutFile), std::unique_ptr<MCCodeEmitter>(MCE),
*MSTI, MCOptions.MCRelaxAll, MCOptions.MCIncrementalLinkerCompatible,
/*DWARFMustBeAtTheEnd*/ false);
break;
}
}
if (!MS)
return createStringError(std::errc::invalid_argument,
"no object streamer for target %s",
TripleName.c_str());
// Finally create the AsmPrinter we'll use to emit the DIEs.
TM.reset(TheTarget->createTargetMachine(TripleName, "", "", TargetOptions(),
std::nullopt));
if (!TM)
return createStringError(std::errc::invalid_argument,
"no target machine for target %s",
TripleName.c_str());
Asm.reset(TheTarget->createAsmPrinter(*TM, std::unique_ptr<MCStreamer>(MS)));
if (!Asm)
return createStringError(std::errc::invalid_argument,
"no asm printer for target %s",
TripleName.c_str());
Asm->setDwarfUsesRelocationsAcrossSections(false);
DebugInfoSectionSize = 0;
return Error::success();
}
void DwarfEmitterImpl::emitAbbrevs(
const SmallVector<std::unique_ptr<DIEAbbrev>> &Abbrevs,
unsigned DwarfVersion) {
MS->switchSection(MOFI->getDwarfAbbrevSection());
MC->setDwarfVersion(DwarfVersion);
Asm->emitDwarfAbbrevs(Abbrevs);
}
void DwarfEmitterImpl::emitCompileUnitHeader(DwarfUnit &Unit) {
MS->switchSection(MOFI->getDwarfInfoSection());
MC->setDwarfVersion(Unit.getVersion());
// Emit size of content not including length itself. The size has already
// been computed in CompileUnit::computeOffsets(). Subtract 4 to that size to
// account for the length field.
Asm->emitInt32(Unit.getUnitSize() - 4);
Asm->emitInt16(Unit.getVersion());
if (Unit.getVersion() >= 5) {
Asm->emitInt8(dwarf::DW_UT_compile);
Asm->emitInt8(Unit.getFormParams().AddrSize);
// Proper offset to the abbreviations table will be set later.
Asm->emitInt32(0);
DebugInfoSectionSize += 12;
} else {
// Proper offset to the abbreviations table will be set later.
Asm->emitInt32(0);
Asm->emitInt8(Unit.getFormParams().AddrSize);
DebugInfoSectionSize += 11;
}
}
void DwarfEmitterImpl::emitDIE(DIE &Die) {
MS->switchSection(MOFI->getDwarfInfoSection());
Asm->emitDwarfDIE(Die);
DebugInfoSectionSize += Die.getSize();
}
void DwarfEmitterImpl::emitDebugNames(DWARF5AccelTable &Table,
DebugNamesUnitsOffsets &CUOffsets,
CompUnitIDToIdx &CUidToIdx) {
if (CUOffsets.empty())
return;
Asm->OutStreamer->switchSection(MOFI->getDwarfDebugNamesSection());
dwarf::Form Form =
DIEInteger::BestForm(/*IsSigned*/ false, (uint64_t)CUidToIdx.size() - 1);
// FIXME: add support for type units + .debug_names. For now the behavior is
// unsuported.
emitDWARF5AccelTable(
Asm.get(), Table, CUOffsets,
[&](const DWARF5AccelTableData &Entry)
-> std::optional<DWARF5AccelTable::UnitIndexAndEncoding> {
if (CUidToIdx.size() > 1)
return {{CUidToIdx[Entry.getUnitID()],
{dwarf::DW_IDX_compile_unit, Form}}};
return std::nullopt;
});
}
void DwarfEmitterImpl::emitAppleNamespaces(
AccelTable<AppleAccelTableStaticOffsetData> &Table) {
Asm->OutStreamer->switchSection(MOFI->getDwarfAccelNamespaceSection());
auto *SectionBegin = Asm->createTempSymbol("namespac_begin");
Asm->OutStreamer->emitLabel(SectionBegin);
emitAppleAccelTable(Asm.get(), Table, "namespac", SectionBegin);
}
void DwarfEmitterImpl::emitAppleNames(
AccelTable<AppleAccelTableStaticOffsetData> &Table) {
Asm->OutStreamer->switchSection(MOFI->getDwarfAccelNamesSection());
auto *SectionBegin = Asm->createTempSymbol("names_begin");
Asm->OutStreamer->emitLabel(SectionBegin);
emitAppleAccelTable(Asm.get(), Table, "names", SectionBegin);
}
void DwarfEmitterImpl::emitAppleObjc(
AccelTable<AppleAccelTableStaticOffsetData> &Table) {
Asm->OutStreamer->switchSection(MOFI->getDwarfAccelObjCSection());
auto *SectionBegin = Asm->createTempSymbol("objc_begin");
Asm->OutStreamer->emitLabel(SectionBegin);
emitAppleAccelTable(Asm.get(), Table, "objc", SectionBegin);
}
void DwarfEmitterImpl::emitAppleTypes(
AccelTable<AppleAccelTableStaticTypeData> &Table) {
Asm->OutStreamer->switchSection(MOFI->getDwarfAccelTypesSection());
auto *SectionBegin = Asm->createTempSymbol("types_begin");
Asm->OutStreamer->emitLabel(SectionBegin);
emitAppleAccelTable(Asm.get(), Table, "types", SectionBegin);
}
|
