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1 //===-- AsmPrinterDwarf.cpp - AsmPrinter Dwarf Support --------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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2 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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3 // The LLVM Compiler Infrastructure
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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4 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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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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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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8 //===----------------------------------------------------------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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9 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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10 // This file implements the Dwarf emissions parts of AsmPrinter.
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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11 //
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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12 //===----------------------------------------------------------------------===//
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13
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77
|
14 #include "ByteStreamer.h"
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|
95
|
15 #include "DwarfDebug.h"
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83
|
16 #include "DwarfExpression.h"
|
|
|
17 #include "llvm/ADT/Twine.h"
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18 #include "llvm/CodeGen/AsmPrinter.h"
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95
|
19 #include "llvm/CodeGen/DIE.h"
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|
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20 #include "llvm/CodeGen/MachineFunction.h"
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|
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21 #include "llvm/CodeGen/MachineModuleInfo.h"
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22 #include "llvm/IR/DataLayout.h"
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23 #include "llvm/MC/MCAsmInfo.h"
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95
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24 #include "llvm/MC/MCRegisterInfo.h"
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25 #include "llvm/MC/MCSection.h"
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26 #include "llvm/MC/MCStreamer.h"
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27 #include "llvm/MC/MCSymbol.h"
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28 #include "llvm/MC/MachineLocation.h"
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29 #include "llvm/Support/Dwarf.h"
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30 #include "llvm/Support/ErrorHandling.h"
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31 #include "llvm/Target/TargetLoweringObjectFile.h"
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32 #include "llvm/Target/TargetMachine.h"
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77
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33 #include "llvm/Target/TargetSubtargetInfo.h"
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34 using namespace llvm;
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35
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77
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36 #define DEBUG_TYPE "asm-printer"
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|
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37
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38 //===----------------------------------------------------------------------===//
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39 // Dwarf Emission Helper Routines
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40 //===----------------------------------------------------------------------===//
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41
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42 /// EmitSLEB128 - emit the specified signed leb128 value.
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43 void AsmPrinter::EmitSLEB128(int64_t Value, const char *Desc) const {
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44 if (isVerbose() && Desc)
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95
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45 OutStreamer->AddComment(Desc);
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46
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47 OutStreamer->EmitSLEB128IntValue(Value);
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48 }
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49
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95
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50 /// EmitULEB128 - emit the specified unsigned leb128 value.
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51 void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc,
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52 unsigned PadTo) const {
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53 if (isVerbose() && Desc)
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95
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54 OutStreamer->AddComment(Desc);
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55
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95
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56 OutStreamer->EmitULEB128IntValue(Value, PadTo);
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57 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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58
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59 /// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
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60 void AsmPrinter::EmitCFAByte(unsigned Val) const {
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61 if (isVerbose()) {
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33
|
62 if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset + 64)
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95
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63 OutStreamer->AddComment("DW_CFA_offset + Reg (" +
|
|
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64 Twine(Val - dwarf::DW_CFA_offset) + ")");
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65 else
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95
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66 OutStreamer->AddComment(dwarf::CallFrameString(Val));
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67 }
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95
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68 OutStreamer->EmitIntValue(Val, 1);
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69 }
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70
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71 static const char *DecodeDWARFEncoding(unsigned Encoding) {
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72 switch (Encoding) {
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33
|
73 case dwarf::DW_EH_PE_absptr:
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74 return "absptr";
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|
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75 case dwarf::DW_EH_PE_omit:
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76 return "omit";
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|
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77 case dwarf::DW_EH_PE_pcrel:
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|
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78 return "pcrel";
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|
|
79 case dwarf::DW_EH_PE_udata4:
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|
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80 return "udata4";
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|
|
81 case dwarf::DW_EH_PE_udata8:
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82 return "udata8";
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|
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83 case dwarf::DW_EH_PE_sdata4:
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84 return "sdata4";
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|
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85 case dwarf::DW_EH_PE_sdata8:
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86 return "sdata8";
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|
87 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
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88 return "pcrel udata4";
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89 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
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90 return "pcrel sdata4";
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91 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
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92 return "pcrel udata8";
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93 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
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94 return "pcrel sdata8";
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95 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4
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96 :
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97 return "indirect pcrel udata4";
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33
|
98 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
|
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99 :
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100 return "indirect pcrel sdata4";
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33
|
101 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8
|
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102 :
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103 return "indirect pcrel udata8";
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33
|
104 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8
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105 :
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106 return "indirect pcrel sdata8";
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107 }
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108
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109 return "<unknown encoding>";
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110 }
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111
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112 /// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
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113 /// encoding. If verbose assembly output is enabled, we output comments
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114 /// describing the encoding. Desc is an optional string saying what the
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115 /// encoding is specifying (e.g. "LSDA").
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116 void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
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117 if (isVerbose()) {
|
|
33
|
118 if (Desc)
|
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95
|
119 OutStreamer->AddComment(Twine(Desc) + " Encoding = " +
|
|
|
120 Twine(DecodeDWARFEncoding(Val)));
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121 else
|
|
95
|
122 OutStreamer->AddComment(Twine("Encoding = ") + DecodeDWARFEncoding(Val));
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123 }
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124
|
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95
|
125 OutStreamer->EmitIntValue(Val, 1);
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126 }
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127
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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128 /// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
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129 unsigned AsmPrinter::GetSizeOfEncodedValue(unsigned Encoding) const {
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130 if (Encoding == dwarf::DW_EH_PE_omit)
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131 return 0;
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132
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133 switch (Encoding & 0x07) {
|
|
33
|
134 default:
|
|
|
135 llvm_unreachable("Invalid encoded value.");
|
|
|
136 case dwarf::DW_EH_PE_absptr:
|
|
95
|
137 return MF->getDataLayout().getPointerSize();
|
|
33
|
138 case dwarf::DW_EH_PE_udata2:
|
|
|
139 return 2;
|
|
|
140 case dwarf::DW_EH_PE_udata4:
|
|
|
141 return 4;
|
|
|
142 case dwarf::DW_EH_PE_udata8:
|
|
|
143 return 8;
|
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144 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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145 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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|
146
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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|
147 void AsmPrinter::EmitTTypeReference(const GlobalValue *GV,
|
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|
148 unsigned Encoding) const {
|
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149 if (GV) {
|
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150 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
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|
151
|
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152 const MCExpr *Exp =
|
|
95
|
153 TLOF.getTTypeGlobalReference(GV, Encoding, *Mang, TM, MMI,
|
|
|
154 *OutStreamer);
|
|
|
155 OutStreamer->EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
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156 } else
|
|
95
|
157 OutStreamer->EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
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|
158 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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|
159
|
|
95
|
160 void AsmPrinter::emitDwarfSymbolReference(const MCSymbol *Label,
|
|
|
161 bool ForceOffset) const {
|
|
|
162 if (!ForceOffset) {
|
|
|
163 // On COFF targets, we have to emit the special .secrel32 directive.
|
|
|
164 if (MAI->needsDwarfSectionOffsetDirective()) {
|
|
|
165 OutStreamer->EmitCOFFSecRel32(Label);
|
|
|
166 return;
|
|
|
167 }
|
|
|
168
|
|
|
169 // If the format uses relocations with dwarf, refer to the symbol directly.
|
|
|
170 if (MAI->doesDwarfUseRelocationsAcrossSections()) {
|
|
|
171 OutStreamer->EmitSymbolValue(Label, 4);
|
|
|
172 return;
|
|
|
173 }
|
|
|
174 }
|
|
|
175
|
|
|
176 // Otherwise, emit it as a label difference from the start of the section.
|
|
|
177 EmitLabelDifference(Label, Label->getSection().getBeginSymbol(), 4);
|
|
|
178 }
|
|
|
179
|
|
|
180 void AsmPrinter::emitDwarfStringOffset(DwarfStringPoolEntryRef S) const {
|
|
|
181 if (MAI->doesDwarfUseRelocationsAcrossSections()) {
|
|
|
182 emitDwarfSymbolReference(S.getSymbol());
|
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|
183 return;
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff
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|
184 }
|
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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|
185
|
|
95
|
186 // Just emit the offset directly; no need for symbol math.
|
|
|
187 EmitInt32(S.getOffset());
|
|
77
|
188 }
|
|
|
189
|
|
|
190 /// EmitDwarfRegOp - Emit dwarf register operation.
|
|
|
191 void AsmPrinter::EmitDwarfRegOp(ByteStreamer &Streamer,
|
|
83
|
192 const MachineLocation &MLoc) const {
|
|
95
|
193 DebugLocDwarfExpression Expr(*MF->getSubtarget().getRegisterInfo(),
|
|
|
194 getDwarfDebug()->getDwarfVersion(), Streamer);
|
|
|
195 const MCRegisterInfo *MRI = MMI->getContext().getRegisterInfo();
|
|
|
196 int Reg = MRI->getDwarfRegNum(MLoc.getReg(), false);
|
|
77
|
197 if (Reg < 0) {
|
|
|
198 // We assume that pointers are always in an addressable register.
|
|
83
|
199 if (MLoc.isIndirect())
|
|
77
|
200 // FIXME: We have no reasonable way of handling errors in here. The
|
|
|
201 // caller might be in the middle of a dwarf expression. We should
|
|
|
202 // probably assert that Reg >= 0 once debug info generation is more
|
|
|
203 // mature.
|
|
83
|
204 return Expr.EmitOp(dwarf::DW_OP_nop,
|
|
|
205 "nop (could not find a dwarf register number)");
|
|
77
|
206
|
|
|
207 // Attempt to find a valid super- or sub-register.
|
|
83
|
208 if (!Expr.AddMachineRegPiece(MLoc.getReg()))
|
|
|
209 Expr.EmitOp(dwarf::DW_OP_nop,
|
|
|
210 "nop (could not find a dwarf register number)");
|
|
|
211 return;
|
|
77
|
212 }
|
|
|
213
|
|
|
214 if (MLoc.isIndirect())
|
|
83
|
215 Expr.AddRegIndirect(Reg, MLoc.getOffset());
|
|
77
|
216 else
|
|
83
|
217 Expr.AddReg(Reg);
|
|
77
|
218 }
|
|
|
219
|
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220 //===----------------------------------------------------------------------===//
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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221 // Dwarf Lowering Routines
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222 //===----------------------------------------------------------------------===//
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223
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224 void AsmPrinter::emitCFIInstruction(const MCCFIInstruction &Inst) const {
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225 switch (Inst.getOperation()) {
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226 default:
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227 llvm_unreachable("Unexpected instruction");
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228 case MCCFIInstruction::OpDefCfaOffset:
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95
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229 OutStreamer->EmitCFIDefCfaOffset(Inst.getOffset());
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230 break;
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231 case MCCFIInstruction::OpDefCfa:
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95
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232 OutStreamer->EmitCFIDefCfa(Inst.getRegister(), Inst.getOffset());
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233 break;
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234 case MCCFIInstruction::OpDefCfaRegister:
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95
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235 OutStreamer->EmitCFIDefCfaRegister(Inst.getRegister());
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236 break;
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237 case MCCFIInstruction::OpOffset:
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95
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238 OutStreamer->EmitCFIOffset(Inst.getRegister(), Inst.getOffset());
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239 break;
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240 case MCCFIInstruction::OpRegister:
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95
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241 OutStreamer->EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
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242 break;
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243 case MCCFIInstruction::OpWindowSave:
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95
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244 OutStreamer->EmitCFIWindowSave();
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245 break;
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77
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246 case MCCFIInstruction::OpSameValue:
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95
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247 OutStreamer->EmitCFISameValue(Inst.getRegister());
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248 break;
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249 case MCCFIInstruction::OpGnuArgsSize:
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250 OutStreamer->EmitCFIGnuArgsSize(Inst.getOffset());
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251 break;
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252 case MCCFIInstruction::OpEscape:
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253 OutStreamer->EmitCFIEscape(Inst.getValues());
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77
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254 break;
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255 }
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256 }
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95
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257
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258 void AsmPrinter::emitDwarfDIE(const DIE &Die) const {
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259 // Emit the code (index) for the abbreviation.
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260 if (isVerbose())
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261 OutStreamer->AddComment("Abbrev [" + Twine(Die.getAbbrevNumber()) + "] 0x" +
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262 Twine::utohexstr(Die.getOffset()) + ":0x" +
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263 Twine::utohexstr(Die.getSize()) + " " +
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264 dwarf::TagString(Die.getTag()));
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265 EmitULEB128(Die.getAbbrevNumber());
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266
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267 // Emit the DIE attribute values.
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268 for (const auto &V : Die.values()) {
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269 dwarf::Attribute Attr = V.getAttribute();
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270 assert(V.getForm() && "Too many attributes for DIE (check abbreviation)");
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271
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272 if (isVerbose()) {
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273 OutStreamer->AddComment(dwarf::AttributeString(Attr));
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274 if (Attr == dwarf::DW_AT_accessibility)
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275 OutStreamer->AddComment(
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276 dwarf::AccessibilityString(V.getDIEInteger().getValue()));
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277 }
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278
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279 // Emit an attribute using the defined form.
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280 V.EmitValue(this);
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281 }
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282
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283 // Emit the DIE children if any.
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284 if (Die.hasChildren()) {
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285 for (auto &Child : Die.children())
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286 emitDwarfDIE(Child);
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287
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288 OutStreamer->AddComment("End Of Children Mark");
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289 EmitInt8(0);
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290 }
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291 }
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292
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293 void
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294 AsmPrinter::emitDwarfAbbrevs(const std::vector<DIEAbbrev *>& Abbrevs) const {
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295 // For each abbreviation.
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296 for (const DIEAbbrev *Abbrev : Abbrevs) {
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297 // Emit the abbreviations code (base 1 index.)
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298 EmitULEB128(Abbrev->getNumber(), "Abbreviation Code");
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299
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300 // Emit the abbreviations data.
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301 Abbrev->Emit(this);
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302 }
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303
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304 // Mark end of abbreviations.
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305 EmitULEB128(0, "EOM(3)");
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306 }
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