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
|
//===- MCAsmBackend.cpp - Target MC Assembly Backend ----------------------===//
//
// 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 "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCDXContainerWriter.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCGOFFObjectWriter.h"
#include "llvm/MC/MCMachObjectWriter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSPIRVObjectWriter.h"
#include "llvm/MC/MCWasmObjectWriter.h"
#include "llvm/MC/MCWinCOFFObjectWriter.h"
#include "llvm/MC/MCXCOFFObjectWriter.h"
#include <cassert>
#include <cstddef>
#include <cstdint>
using namespace llvm;
MCAsmBackend::MCAsmBackend(llvm::endianness Endian, unsigned RelaxFixupKind)
: Endian(Endian), RelaxFixupKind(RelaxFixupKind) {}
MCAsmBackend::~MCAsmBackend() = default;
std::unique_ptr<MCObjectWriter>
MCAsmBackend::createObjectWriter(raw_pwrite_stream &OS) const {
auto TW = createObjectTargetWriter();
bool IsLE = Endian == llvm::endianness::little;
switch (TW->getFormat()) {
case Triple::MachO:
return createMachObjectWriter(cast<MCMachObjectTargetWriter>(std::move(TW)),
OS, IsLE);
case Triple::COFF:
return createWinCOFFObjectWriter(
cast<MCWinCOFFObjectTargetWriter>(std::move(TW)), OS);
case Triple::ELF:
return std::make_unique<ELFObjectWriter>(
cast<MCELFObjectTargetWriter>(std::move(TW)), OS, IsLE);
case Triple::SPIRV:
return createSPIRVObjectWriter(
cast<MCSPIRVObjectTargetWriter>(std::move(TW)), OS);
case Triple::Wasm:
return createWasmObjectWriter(cast<MCWasmObjectTargetWriter>(std::move(TW)),
OS);
case Triple::GOFF:
return createGOFFObjectWriter(cast<MCGOFFObjectTargetWriter>(std::move(TW)),
OS);
case Triple::XCOFF:
return createXCOFFObjectWriter(
cast<MCXCOFFObjectTargetWriter>(std::move(TW)), OS);
case Triple::DXContainer:
return createDXContainerObjectWriter(
cast<MCDXContainerTargetWriter>(std::move(TW)), OS);
default:
llvm_unreachable("unexpected object format");
}
}
std::unique_ptr<MCObjectWriter>
MCAsmBackend::createDwoObjectWriter(raw_pwrite_stream &OS,
raw_pwrite_stream &DwoOS) const {
auto TW = createObjectTargetWriter();
switch (TW->getFormat()) {
case Triple::COFF:
return createWinCOFFDwoObjectWriter(
cast<MCWinCOFFObjectTargetWriter>(std::move(TW)), OS, DwoOS);
case Triple::ELF:
return std::make_unique<ELFObjectWriter>(
cast<MCELFObjectTargetWriter>(std::move(TW)), OS, DwoOS,
Endian == llvm::endianness::little);
case Triple::Wasm:
return createWasmDwoObjectWriter(
cast<MCWasmObjectTargetWriter>(std::move(TW)), OS, DwoOS);
default:
report_fatal_error("dwo only supported with COFF, ELF, and Wasm");
}
}
std::optional<MCFixupKind> MCAsmBackend::getFixupKind(StringRef Name) const {
return std::nullopt;
}
const MCFixupKindInfo &MCAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
static const MCFixupKindInfo Builtins[] = {
{"FK_NONE", 0, 0, 0},
{"FK_Data_1", 0, 8, 0},
{"FK_Data_2", 0, 16, 0},
{"FK_Data_4", 0, 32, 0},
{"FK_Data_8", 0, 64, 0},
{"FK_Data_leb128", 0, 0, 0},
{"FK_PCRel_1", 0, 8, MCFixupKindInfo::FKF_IsPCRel},
{"FK_PCRel_2", 0, 16, MCFixupKindInfo::FKF_IsPCRel},
{"FK_PCRel_4", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"FK_PCRel_8", 0, 64, MCFixupKindInfo::FKF_IsPCRel},
{"FK_GPRel_1", 0, 8, 0},
{"FK_GPRel_2", 0, 16, 0},
{"FK_GPRel_4", 0, 32, 0},
{"FK_GPRel_8", 0, 64, 0},
{"FK_DTPRel_4", 0, 32, 0},
{"FK_DTPRel_8", 0, 64, 0},
{"FK_TPRel_4", 0, 32, 0},
{"FK_TPRel_8", 0, 64, 0},
{"FK_SecRel_1", 0, 8, 0},
{"FK_SecRel_2", 0, 16, 0},
{"FK_SecRel_4", 0, 32, 0},
{"FK_SecRel_8", 0, 64, 0},
};
assert((size_t)Kind <= std::size(Builtins) && "Unknown fixup kind");
return Builtins[Kind];
}
bool MCAsmBackend::fixupNeedsRelaxationAdvanced(const MCAssembler &Asm,
const MCFixup &Fixup,
bool Resolved, uint64_t Value,
const MCRelaxableFragment *DF,
const bool WasForced) const {
if (!Resolved)
return true;
return fixupNeedsRelaxation(Fixup, Value);
}
bool MCAsmBackend::isDarwinCanonicalPersonality(const MCSymbol *Sym) const {
// Consider a NULL personality (ie., no personality encoding) to be canonical
// because it's always at 0.
if (!Sym)
return true;
if (!Sym->isMachO())
llvm_unreachable("Expected MachO symbols only");
StringRef name = Sym->getName();
// XXX: We intentionally leave out "___gcc_personality_v0" because, despite
// being system-defined like these two, it is not very commonly-used.
// Reserving an empty slot for it seems silly.
return name == "___gxx_personality_v0" || name == "___objc_personality_v0";
}
|
