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
| //=== HexagonMCELFStreamer.cpp - Hexagon subclass of MCELFStreamer -------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// This file is a stub that parses a MCInst bundle and passes the
// instructions on to the real streamer.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "hexagonmcelfstreamer"
#include "MCTargetDesc/HexagonMCELFStreamer.h"
#include "MCTargetDesc/HexagonMCInstrInfo.h"
#include "MCTargetDesc/HexagonMCShuffler.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCObjectStreamer.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCSection.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCSymbolELF.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
#include <cassert>
#include <cstdint>
using namespace llvm;
static cl::opt<unsigned> GPSize
("gpsize", cl::NotHidden,
cl::desc("Global Pointer Addressing Size. The default size is 8."),
cl::Prefix,
cl::init(8));
HexagonMCELFStreamer::HexagonMCELFStreamer(
MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter)
: MCELFStreamer(Context, std::move(TAB), std::move(OW), std::move(Emitter)),
MCII(createHexagonMCInstrInfo()) {}
HexagonMCELFStreamer::HexagonMCELFStreamer(
MCContext &Context, std::unique_ptr<MCAsmBackend> TAB,
std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter,
MCAssembler *Assembler)
: MCELFStreamer(Context, std::move(TAB), std::move(OW), std::move(Emitter)),
MCII(createHexagonMCInstrInfo()) {}
void HexagonMCELFStreamer::EmitInstruction(const MCInst &MCB,
const MCSubtargetInfo &STI) {
assert(MCB.getOpcode() == Hexagon::BUNDLE);
assert(HexagonMCInstrInfo::bundleSize(MCB) <= HEXAGON_PACKET_SIZE);
assert(HexagonMCInstrInfo::bundleSize(MCB) > 0);
// At this point, MCB is a bundle
// Iterate through the bundle and assign addends for the instructions
for (auto const &I : HexagonMCInstrInfo::bundleInstructions(MCB)) {
MCInst *MCI = const_cast<MCInst *>(I.getInst());
EmitSymbol(*MCI);
}
MCObjectStreamer::EmitInstruction(MCB, STI);
}
void HexagonMCELFStreamer::EmitSymbol(const MCInst &Inst) {
// Scan for values.
for (unsigned i = Inst.getNumOperands(); i--;)
if (Inst.getOperand(i).isExpr())
visitUsedExpr(*Inst.getOperand(i).getExpr());
}
// EmitCommonSymbol and EmitLocalCommonSymbol are extended versions of the
// functions found in MCELFStreamer.cpp taking AccessSize as an additional
// parameter.
void HexagonMCELFStreamer::HexagonMCEmitCommonSymbol(MCSymbol *Symbol,
uint64_t Size,
unsigned ByteAlignment,
unsigned AccessSize) {
getAssembler().registerSymbol(*Symbol);
StringRef sbss[4] = {".sbss.1", ".sbss.2", ".sbss.4", ".sbss.8"};
auto ELFSymbol = cast<MCSymbolELF>(Symbol);
if (!ELFSymbol->isBindingSet()) {
ELFSymbol->setBinding(ELF::STB_GLOBAL);
ELFSymbol->setExternal(true);
}
ELFSymbol->setType(ELF::STT_OBJECT);
if (ELFSymbol->getBinding() == ELF::STB_LOCAL) {
StringRef SectionName =
((AccessSize == 0) || (Size == 0) || (Size > GPSize))
? ".bss"
: sbss[(Log2_64(AccessSize))];
MCSection &Section = *getAssembler().getContext().getELFSection(
SectionName, ELF::SHT_NOBITS, ELF::SHF_WRITE | ELF::SHF_ALLOC);
MCSectionSubPair P = getCurrentSection();
SwitchSection(&Section);
if (ELFSymbol->isUndefined()) {
EmitValueToAlignment(ByteAlignment, 0, 1, 0);
EmitLabel(Symbol);
EmitZeros(Size);
}
// Update the maximum alignment of the section if necessary.
if (Align(ByteAlignment) > Section.getAlignment())
Section.setAlignment(Align(ByteAlignment));
SwitchSection(P.first, P.second);
} else {
if (ELFSymbol->declareCommon(Size, ByteAlignment))
report_fatal_error("Symbol: " + Symbol->getName() +
" redeclared as different type");
if ((AccessSize) && (Size <= GPSize)) {
uint64_t SectionIndex =
(AccessSize <= GPSize)
? ELF::SHN_HEXAGON_SCOMMON + (Log2_64(AccessSize) + 1)
: (unsigned)ELF::SHN_HEXAGON_SCOMMON;
ELFSymbol->setIndex(SectionIndex);
}
}
ELFSymbol->setSize(MCConstantExpr::create(Size, getContext()));
}
void HexagonMCELFStreamer::HexagonMCEmitLocalCommonSymbol(MCSymbol *Symbol,
uint64_t Size,
unsigned ByteAlignment,
unsigned AccessSize) {
getAssembler().registerSymbol(*Symbol);
auto ELFSymbol = cast<MCSymbolELF>(Symbol);
ELFSymbol->setBinding(ELF::STB_LOCAL);
ELFSymbol->setExternal(false);
HexagonMCEmitCommonSymbol(Symbol, Size, ByteAlignment, AccessSize);
}
namespace llvm {
MCStreamer *createHexagonELFStreamer(Triple const &TT, MCContext &Context,
std::unique_ptr<MCAsmBackend> MAB,
std::unique_ptr<MCObjectWriter> OW,
std::unique_ptr<MCCodeEmitter> CE) {
return new HexagonMCELFStreamer(Context, std::move(MAB), std::move(OW),
std::move(CE));
}
} // end namespace llvm
|