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annotate lib/CodeGen/AsmPrinter/AsmPrinterDwarf.cpp @ 83:60c9769439b8 LLVM3.7

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LLVM 3.7
author Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
date Wed, 18 Feb 2015 14:55:36 +0900
parents 54457678186b
children afa8332a0e37
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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 #include "ByteStreamer.h"
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15 #include "DwarfExpression.h"
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16 #include "llvm/ADT/Twine.h"
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17 #include "llvm/CodeGen/AsmPrinter.h"
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18 #include "llvm/IR/DataLayout.h"
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19 #include "llvm/MC/MCAsmInfo.h"
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20 #include "llvm/MC/MCSection.h"
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21 #include "llvm/MC/MCStreamer.h"
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22 #include "llvm/MC/MCSymbol.h"
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23 #include "llvm/MC/MachineLocation.h"
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24 #include "llvm/Support/Dwarf.h"
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25 #include "llvm/Support/ErrorHandling.h"
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26 #include "llvm/Target/TargetFrameLowering.h"
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27 #include "llvm/Target/TargetLoweringObjectFile.h"
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28 #include "llvm/Target/TargetMachine.h"
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29 #include "llvm/Target/TargetRegisterInfo.h"
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30 #include "llvm/Target/TargetSubtargetInfo.h"
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31 using namespace llvm;
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32
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33 #define DEBUG_TYPE "asm-printer"
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34
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35 void DebugLocDwarfExpression::EmitOp(uint8_t Op, const char *Comment) {
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36 BS.EmitInt8(
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37 Op, Comment ? Twine(Comment) + " " + dwarf::OperationEncodingString(Op)
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38 : dwarf::OperationEncodingString(Op));
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39 }
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40
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41 void DebugLocDwarfExpression::EmitSigned(int Value) {
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42 BS.EmitSLEB128(Value, Twine(Value));
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43 }
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44
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45 void DebugLocDwarfExpression::EmitUnsigned(unsigned Value) {
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46 BS.EmitULEB128(Value, Twine(Value));
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47 }
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48
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49 bool DebugLocDwarfExpression::isFrameRegister(unsigned MachineReg) {
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50 // This information is not available while emitting .debug_loc entries.
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51 return false;
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52 }
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53
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54 //===----------------------------------------------------------------------===//
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55 // Dwarf Emission Helper Routines
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56 //===----------------------------------------------------------------------===//
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57
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58 /// EmitSLEB128 - emit the specified signed leb128 value.
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59 void AsmPrinter::EmitSLEB128(int64_t Value, const char *Desc) const {
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60 if (isVerbose() && Desc)
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61 OutStreamer.AddComment(Desc);
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62
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63 OutStreamer.EmitSLEB128IntValue(Value);
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64 }
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65
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66 /// EmitULEB128 - emit the specified signed leb128 value.
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67 void AsmPrinter::EmitULEB128(uint64_t Value, const char *Desc,
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68 unsigned PadTo) const {
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69 if (isVerbose() && Desc)
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70 OutStreamer.AddComment(Desc);
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71
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72 OutStreamer.EmitULEB128IntValue(Value, PadTo);
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73 }
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74
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75 /// EmitCFAByte - Emit a .byte 42 directive for a DW_CFA_xxx value.
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76 void AsmPrinter::EmitCFAByte(unsigned Val) const {
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77 if (isVerbose()) {
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78 if (Val >= dwarf::DW_CFA_offset && Val < dwarf::DW_CFA_offset + 64)
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79 OutStreamer.AddComment("DW_CFA_offset + Reg (" +
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80 Twine(Val - dwarf::DW_CFA_offset) + ")");
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81 else
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82 OutStreamer.AddComment(dwarf::CallFrameString(Val));
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83 }
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84 OutStreamer.EmitIntValue(Val, 1);
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85 }
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86
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87 static const char *DecodeDWARFEncoding(unsigned Encoding) {
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88 switch (Encoding) {
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89 case dwarf::DW_EH_PE_absptr:
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90 return "absptr";
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91 case dwarf::DW_EH_PE_omit:
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92 return "omit";
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93 case dwarf::DW_EH_PE_pcrel:
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94 return "pcrel";
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95 case dwarf::DW_EH_PE_udata4:
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96 return "udata4";
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97 case dwarf::DW_EH_PE_udata8:
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98 return "udata8";
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99 case dwarf::DW_EH_PE_sdata4:
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100 return "sdata4";
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101 case dwarf::DW_EH_PE_sdata8:
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102 return "sdata8";
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103 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4:
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104 return "pcrel udata4";
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105 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4:
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106 return "pcrel sdata4";
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107 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8:
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108 return "pcrel udata8";
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109 case dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8:
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110 return "pcrel sdata8";
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111 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata4
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112 :
0
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113 return "indirect pcrel udata4";
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114 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata4
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115 :
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116 return "indirect pcrel sdata4";
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117 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_udata8
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118 :
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119 return "indirect pcrel udata8";
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120 case dwarf::DW_EH_PE_indirect | dwarf::DW_EH_PE_pcrel | dwarf::DW_EH_PE_sdata8
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121 :
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122 return "indirect pcrel sdata8";
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123 }
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124
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125 return "<unknown encoding>";
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126 }
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
127
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
128 /// EmitEncodingByte - Emit a .byte 42 directive that corresponds to an
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 /// encoding. If verbose assembly output is enabled, we output comments
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
130 /// describing the encoding. Desc is an optional string saying what the
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
131 /// encoding is specifying (e.g. "LSDA").
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
132 void AsmPrinter::EmitEncodingByte(unsigned Val, const char *Desc) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
133 if (isVerbose()) {
33
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
134 if (Desc)
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
135 OutStreamer.AddComment(Twine(Desc) + " Encoding = " +
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
136 Twine(DecodeDWARFEncoding(Val)));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
137 else
33
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
138 OutStreamer.AddComment(Twine("Encoding = ") + DecodeDWARFEncoding(Val));
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
139 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
140
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
141 OutStreamer.EmitIntValue(Val, 1);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
142 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 /// GetSizeOfEncodedValue - Return the size of the encoding in bytes.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 unsigned AsmPrinter::GetSizeOfEncodedValue(unsigned Encoding) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
146 if (Encoding == dwarf::DW_EH_PE_omit)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
147 return 0;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
148
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
149 switch (Encoding & 0x07) {
33
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
150 default:
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
151 llvm_unreachable("Invalid encoded value.");
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
152 case dwarf::DW_EH_PE_absptr:
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
153 return TM.getDataLayout()->getPointerSize();
33
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
154 case dwarf::DW_EH_PE_udata2:
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
155 return 2;
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
156 case dwarf::DW_EH_PE_udata4:
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
157 return 4;
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
158 case dwarf::DW_EH_PE_udata8:
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
159 return 8;
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
160 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
161 }
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 void AsmPrinter::EmitTTypeReference(const GlobalValue *GV,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 unsigned Encoding) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 if (GV) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
166 const TargetLoweringObjectFile &TLOF = getObjFileLowering();
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 const MCExpr *Exp =
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
169 TLOF.getTTypeGlobalReference(GV, Encoding, *Mang, TM, MMI, OutStreamer);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
170 OutStreamer.EmitValue(Exp, GetSizeOfEncodedValue(Encoding));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
171 } else
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
172 OutStreamer.EmitIntValue(0, GetSizeOfEncodedValue(Encoding));
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
173 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
174
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 /// 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
176 /// 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
177 /// it (e.g. cygwin) or by emitting it as an offset from a label at the start
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
178 /// of the section.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
179 ///
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
180 /// SectionLabel is a temporary label emitted at the start of the section that
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
181 /// Label lives in.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
182 void AsmPrinter::EmitSectionOffset(const MCSymbol *Label,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
183 const MCSymbol *SectionLabel) const {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
184 // 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
185 if (MAI->needsDwarfSectionOffsetDirective()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
186 OutStreamer.EmitCOFFSecRel32(Label);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
187 return;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
188 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
189
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
190 // 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
191 const MCSection &Section = SectionLabel->getSection();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
192
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
193 // 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
194 // section label for sanity.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
195 assert((!Label->isInSection() || &Label->getSection() == &Section) &&
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
196 "Section offset using wrong section base for label");
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
197
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
198 // 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
199 // just emit an absolute reference to save a relocation.
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
200 if (Section.isBaseAddressKnownZero()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
201 OutStreamer.EmitSymbolValue(Label, 4);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 return;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
204
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
205 // 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
206 EmitLabelDifference(Label, SectionLabel, 4);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
207 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
208
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
209 // Some targets do not provide a DWARF register number for every
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
210 // register. This function attempts to emit a DWARF register by
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
211 // emitting a piece of a super-register or by piecing together
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
212 // multiple subregisters that alias the register.
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
213 void AsmPrinter::EmitDwarfRegOpPiece(ByteStreamer &Streamer,
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
214 const MachineLocation &MLoc,
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
215 unsigned PieceSizeInBits,
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
216 unsigned PieceOffsetInBits) const {
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
217 assert(MLoc.isReg() && "MLoc must be a register");
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
218 DebugLocDwarfExpression Expr(*this, Streamer);
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
219 Expr.AddMachineRegPiece(MLoc.getReg(), PieceSizeInBits, PieceOffsetInBits);
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
220 }
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
221
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
222 void AsmPrinter::EmitDwarfOpPiece(ByteStreamer &Streamer,
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
223 unsigned PieceSizeInBits,
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
224 unsigned PieceOffsetInBits) const {
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
225 DebugLocDwarfExpression Expr(*this, Streamer);
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
226 Expr.AddOpPiece(PieceSizeInBits, PieceOffsetInBits);
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
227 }
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
228
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
229 /// EmitDwarfRegOp - Emit dwarf register operation.
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
230 void AsmPrinter::EmitDwarfRegOp(ByteStreamer &Streamer,
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
231 const MachineLocation &MLoc) const {
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
232 DebugLocDwarfExpression Expr(*this, Streamer);
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
233 const TargetRegisterInfo *TRI = TM.getSubtargetImpl()->getRegisterInfo();
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
234 int Reg = TRI->getDwarfRegNum(MLoc.getReg(), false);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
235 if (Reg < 0) {
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
236 // We assume that pointers are always in an addressable register.
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
237 if (MLoc.isIndirect())
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
238 // FIXME: We have no reasonable way of handling errors in here. The
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
239 // caller might be in the middle of a dwarf expression. We should
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
240 // probably assert that Reg >= 0 once debug info generation is more
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
241 // mature.
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
242 return Expr.EmitOp(dwarf::DW_OP_nop,
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
243 "nop (could not find a dwarf register number)");
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
244
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
245 // Attempt to find a valid super- or sub-register.
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
246 if (!Expr.AddMachineRegPiece(MLoc.getReg()))
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
247 Expr.EmitOp(dwarf::DW_OP_nop,
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
248 "nop (could not find a dwarf register number)");
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
249 return;
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
250 }
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
251
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
252 if (MLoc.isIndirect())
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
253 Expr.AddRegIndirect(Reg, MLoc.getOffset());
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
254 else
83
60c9769439b8 LLVM 3.7
Tatsuki IHA <e125716@ie.u-ryukyu.ac.jp>
parents: 77
diff changeset
255 Expr.AddReg(Reg);
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
256 }
54457678186b LLVM 3.6
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257
0
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258 //===----------------------------------------------------------------------===//
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259 // Dwarf Lowering Routines
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260 //===----------------------------------------------------------------------===//
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261
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262 void AsmPrinter::emitCFIInstruction(const MCCFIInstruction &Inst) const {
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263 switch (Inst.getOperation()) {
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264 default:
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265 llvm_unreachable("Unexpected instruction");
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266 case MCCFIInstruction::OpDefCfaOffset:
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267 OutStreamer.EmitCFIDefCfaOffset(Inst.getOffset());
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268 break;
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269 case MCCFIInstruction::OpDefCfa:
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270 OutStreamer.EmitCFIDefCfa(Inst.getRegister(), Inst.getOffset());
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271 break;
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272 case MCCFIInstruction::OpDefCfaRegister:
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273 OutStreamer.EmitCFIDefCfaRegister(Inst.getRegister());
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274 break;
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275 case MCCFIInstruction::OpOffset:
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276 OutStreamer.EmitCFIOffset(Inst.getRegister(), Inst.getOffset());
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277 break;
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278 case MCCFIInstruction::OpRegister:
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279 OutStreamer.EmitCFIRegister(Inst.getRegister(), Inst.getRegister2());
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280 break;
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281 case MCCFIInstruction::OpWindowSave:
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282 OutStreamer.EmitCFIWindowSave();
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283 break;
77
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284 case MCCFIInstruction::OpSameValue:
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285 OutStreamer.EmitCFISameValue(Inst.getRegister());
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286 break;
0
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287 }
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288 }