annotate lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp @ 0:95c75e76d11b

LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900 (2013-12-12)
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children e4204d083e25
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1 //===-- AsmPrinterDwarf.cpp - AsmPrinter Dwarf Support --------------------===//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 //
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10 // This file implements the Dwarf emissions parts of AsmPrinter.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #define DEBUG_TYPE "asm-printer"
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15 #include "llvm/CodeGen/AsmPrinter.h"
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16 #include "llvm/ADT/Twine.h"
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17 #include "llvm/IR/DataLayout.h"
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18 #include "llvm/MC/MCAsmInfo.h"
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19 #include "llvm/MC/MCSection.h"
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20 #include "llvm/MC/MCStreamer.h"
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21 #include "llvm/MC/MCSymbol.h"
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22 #include "llvm/MC/MachineLocation.h"
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23 #include "llvm/Support/Dwarf.h"
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24 #include "llvm/Support/ErrorHandling.h"
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25 #include "llvm/Target/TargetFrameLowering.h"
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26 #include "llvm/Target/TargetLoweringObjectFile.h"
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27 #include "llvm/Target/TargetMachine.h"
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28 #include "llvm/Target/TargetRegisterInfo.h"
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29 using namespace llvm;
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30
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31 //===----------------------------------------------------------------------===//
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32 // Dwarf Emission Helper Routines
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33 //===----------------------------------------------------------------------===//
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34
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35 /// EmitSLEB128 - emit the specified signed leb128 value.
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36 void AsmPrinter::EmitSLEB128(int64_t Value, const char *Desc) const {
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37 if (isVerbose() && Desc)
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38 OutStreamer.AddComment(Desc);
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39
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40 OutStreamer.EmitSLEB128IntValue(Value);
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41 }
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42
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43 /// EmitULEB128 - emit the specified signed leb128 value.
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44 void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc,
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45 unsigned PadTo) const {
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46 if (isVerbose() && Desc)
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47 OutStreamer.AddComment(Desc);
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48
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49 OutStreamer.EmitULEB128IntValue(Value, PadTo);
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50 }
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51
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52 /// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
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53 void AsmPrinter::EmitCFAByte(unsigned Val) const {
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54 if (isVerbose()) {
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55 if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset+64)
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56 OutStreamer.AddComment("DW_CFA_offset + Reg (" +
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57 Twine(Val-dwarf::DW_CFA_offset) + ")");
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58 else
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59 OutStreamer.AddComment(dwarf::CallFrameString(Val));
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60 }
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61 OutStreamer.EmitIntValue(Val, 1);
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62 }
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63
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64 static const char *DecodeDWARFEncoding(unsigned Encoding) {
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65 switch (Encoding) {
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66 case dwarf::DW_EH_PE_absptr: return "absptr";
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67 case dwarf::DW_EH_PE_omit: return "omit";
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68 case dwarf::DW_EH_PE_pcrel: return "pcrel";
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69 case dwarf::DW_EH_PE_udata4: return "udata4";
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70 case dwarf::DW_EH_PE_udata8: return "udata8";
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71 case dwarf::DW_EH_PE_sdata4: return "sdata4";
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72 case dwarf::DW_EH_PE_sdata8: return "sdata8";
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73 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4: return "pcrel udata4";
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74 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4: return "pcrel sdata4";
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75 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8: return "pcrel udata8";
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76 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8: return "pcrel sdata8";
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77 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata4:
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78 return "indirect pcrel udata4";
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79 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata4:
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80 return "indirect pcrel sdata4";
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81 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_udata8:
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82 return "indirect pcrel udata8";
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83 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel |dwarf::DW_EH_PE_sdata8:
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84 return "indirect pcrel sdata8";
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85 }
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86
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87 return "<unknown encoding>";
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88 }
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89
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90
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91 /// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
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92 /// encoding. If verbose assembly output is enabled, we output comments
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93 /// describing the encoding. Desc is an optional string saying what the
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94 /// encoding is specifying (e.g. "LSDA").
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95 void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
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96 if (isVerbose()) {
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97 if (Desc != 0)
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98 OutStreamer.AddComment(Twine(Desc)+" Encoding = " +
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99 Twine(DecodeDWARFEncoding(Val)));
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100 else
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101 OutStreamer.AddComment(Twine("Encoding = ") +
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102 DecodeDWARFEncoding(Val));
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103 }
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104
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105 OutStreamer.EmitIntValue(Val, 1);
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106 }
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107
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108 /// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
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109 unsigned AsmPrinter::GetSizeOfEncodedValue(unsigned Encoding) const {
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110 if (Encoding == dwarf::DW_EH_PE_omit)
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111 return 0;
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112
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113 switch (Encoding & 0x07) {
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114 default: llvm_unreachable("Invalid encoded value.");
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115 case dwarf::DW_EH_PE_absptr: return TM.getDataLayout()->getPointerSize();
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116 case dwarf::DW_EH_PE_udata2: return 2;
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117 case dwarf::DW_EH_PE_udata4: return 4;
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118 case dwarf::DW_EH_PE_udata8: return 8;
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119 }
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120 }
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121
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122 void AsmPrinter::EmitTTypeReference(const GlobalValue *GV,
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123 unsigned Encoding) const {
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124 if (GV) {
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125 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
95c75e76d11b LLVM 3.4
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parents:
diff changeset
126
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
127 const MCExpr *Exp =
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
128 TLOF.getTTypeGlobalReference(GV, Mang, MMI, Encoding, OutStreamer);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 } else
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131 OutStreamer.EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133
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parents:
diff changeset
134 /// EmitSectionOffset - Emit the 4-byte offset of Label from the start of its
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 /// section. This can be done with a special directive if the target supports
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 /// it (e.g. cygwin) or by emitting it as an offset from a label at the start
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 /// of the section.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
138 ///
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 /// SectionLabel is a temporary label emitted at the start of the section that
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140 /// Label lives in.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 void AsmPrinter::EmitSectionOffset(const MCSymbol *Label,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 const MCSymbol *SectionLabel) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 // On COFF targets, we have to emit the special .secrel32 directive.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 if (MAI->needsDwarfSectionOffsetDirective()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 OutStreamer.EmitCOFFSecRel32(Label);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 return;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148
95c75e76d11b LLVM 3.4
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parents:
diff changeset
149 // Get the section that we're referring to, based on SectionLabel.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
150 const MCSection &Section = SectionLabel->getSection();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
151
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
152 // If Label has already been emitted, verify that it is in the same section as
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
153 // section label for sanity.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
154 assert((!Label->isInSection() || &Label->getSection() == &Section) &&
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
155 "Section offset using wrong section base for label");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
156
95c75e76d11b LLVM 3.4
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parents:
diff changeset
157 // If the section in question will end up with an address of 0 anyway, we can
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
158 // just emit an absolute reference to save a relocation.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
159 if (Section.isBaseAddressKnownZero()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 OutStreamer.EmitSymbolValue(Label, 4);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 return;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
162 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
163
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 // Otherwise, emit it as a label difference from the start of the section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 EmitLabelDifference(Label, SectionLabel, 4);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 //===----------------------------------------------------------------------===//
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 // Dwarf Lowering Routines
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 //===----------------------------------------------------------------------===//
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parents:
diff changeset
171
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 void AsmPrinter::emitCFIInstruction(const MCCFIInstruction &Inst) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 switch (Inst.getOperation()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174 default:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 llvm_unreachable("Unexpected instruction");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
176 case MCCFIInstruction::OpDefCfaOffset:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
177 OutStreamer.EmitCFIDefCfaOffset(Inst.getOffset());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
179 case MCCFIInstruction::OpDefCfa:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 OutStreamer.EmitCFIDefCfa(Inst.getRegister(), Inst.getOffset());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 case MCCFIInstruction::OpDefCfaRegister:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 OutStreamer.EmitCFIDefCfaRegister(Inst.getRegister());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
185 case MCCFIInstruction::OpOffset:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 OutStreamer.EmitCFIOffset(Inst.getRegister(), Inst.getOffset());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 case MCCFIInstruction::OpRegister:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189 OutStreamer.EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
191 case MCCFIInstruction::OpWindowSave:
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192 OutStreamer.EmitCFIWindowSave();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 break;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
194 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 }