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annotate lib/MC/MCWin64EH.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
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 //===- lib/MC/MCWin64EH.cpp - MCWin64EH implementation --------------------===//
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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 #include "llvm/MC/MCWin64EH.h"
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11 #include "llvm/ADT/Twine.h"
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12 #include "llvm/MC/MCContext.h"
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13 #include "llvm/MC/MCExpr.h"
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14 #include "llvm/MC/MCObjectFileInfo.h"
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15 #include "llvm/MC/MCSectionCOFF.h"
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16 #include "llvm/MC/MCStreamer.h"
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17 #include "llvm/MC/MCSymbol.h"
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18 #include "llvm/Support/Win64EH.h"
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19
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20 namespace llvm {
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21
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22 // NOTE: All relocations generated here are 4-byte image-relative.
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23
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24 static uint8_t CountOfUnwindCodes(std::vector<WinEH::Instruction> &Insns) {
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25 uint8_t Count = 0;
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26 for (const auto &I : Insns) {
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27 switch (static_cast<Win64EH::UnwindOpcodes>(I.Operation)) {
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28 case Win64EH::UOP_PushNonVol:
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29 case Win64EH::UOP_AllocSmall:
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30 case Win64EH::UOP_SetFPReg:
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31 case Win64EH::UOP_PushMachFrame:
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32 Count += 1;
0
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33 break;
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34 case Win64EH::UOP_SaveNonVol:
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35 case Win64EH::UOP_SaveXMM128:
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36 Count += 2;
0
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37 break;
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38 case Win64EH::UOP_SaveNonVolBig:
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39 case Win64EH::UOP_SaveXMM128Big:
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40 Count += 3;
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41 break;
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42 case Win64EH::UOP_AllocLarge:
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43 Count += (I.Offset > 512 * 1024 - 8) ? 3 : 2;
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44 break;
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45 }
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46 }
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47 return Count;
0
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48 }
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49
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50 static void EmitAbsDifference(MCStreamer &Streamer, const MCSymbol *LHS,
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51 const MCSymbol *RHS) {
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52 MCContext &Context = Streamer.getContext();
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53 const MCExpr *Diff =
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54 MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create(LHS, Context),
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55 MCSymbolRefExpr::Create(RHS, Context), Context);
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56 Streamer.EmitValue(Diff, 1);
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57 }
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58
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59 static void EmitUnwindCode(MCStreamer &streamer, const MCSymbol *begin,
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60 WinEH::Instruction &inst) {
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61 uint8_t b2;
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62 uint16_t w;
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63 b2 = (inst.Operation & 0x0F);
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64 switch (static_cast<Win64EH::UnwindOpcodes>(inst.Operation)) {
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65 case Win64EH::UOP_PushNonVol:
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66 EmitAbsDifference(streamer, inst.Label, begin);
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67 b2 |= (inst.Register & 0x0F) << 4;
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68 streamer.EmitIntValue(b2, 1);
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69 break;
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70 case Win64EH::UOP_AllocLarge:
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71 EmitAbsDifference(streamer, inst.Label, begin);
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72 if (inst.Offset > 512 * 1024 - 8) {
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73 b2 |= 0x10;
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74 streamer.EmitIntValue(b2, 1);
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75 w = inst.Offset & 0xFFF8;
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76 streamer.EmitIntValue(w, 2);
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77 w = inst.Offset >> 16;
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78 } else {
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79 streamer.EmitIntValue(b2, 1);
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80 w = inst.Offset >> 3;
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81 }
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82 streamer.EmitIntValue(w, 2);
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83 break;
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84 case Win64EH::UOP_AllocSmall:
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85 b2 |= (((inst.Offset - 8) >> 3) & 0x0F) << 4;
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86 EmitAbsDifference(streamer, inst.Label, begin);
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87 streamer.EmitIntValue(b2, 1);
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88 break;
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89 case Win64EH::UOP_SetFPReg:
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90 EmitAbsDifference(streamer, inst.Label, begin);
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91 streamer.EmitIntValue(b2, 1);
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92 break;
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93 case Win64EH::UOP_SaveNonVol:
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94 case Win64EH::UOP_SaveXMM128:
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95 b2 |= (inst.Register & 0x0F) << 4;
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96 EmitAbsDifference(streamer, inst.Label, begin);
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97 streamer.EmitIntValue(b2, 1);
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98 w = inst.Offset >> 3;
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99 if (inst.Operation == Win64EH::UOP_SaveXMM128)
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100 w >>= 1;
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101 streamer.EmitIntValue(w, 2);
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102 break;
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103 case Win64EH::UOP_SaveNonVolBig:
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104 case Win64EH::UOP_SaveXMM128Big:
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105 b2 |= (inst.Register & 0x0F) << 4;
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106 EmitAbsDifference(streamer, inst.Label, begin);
0
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107 streamer.EmitIntValue(b2, 1);
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108 if (inst.Operation == Win64EH::UOP_SaveXMM128Big)
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109 w = inst.Offset & 0xFFF0;
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110 else
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111 w = inst.Offset & 0xFFF8;
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112 streamer.EmitIntValue(w, 2);
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113 w = inst.Offset >> 16;
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114 streamer.EmitIntValue(w, 2);
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115 break;
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116 case Win64EH::UOP_PushMachFrame:
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117 if (inst.Offset == 1)
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118 b2 |= 0x10;
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119 EmitAbsDifference(streamer, inst.Label, begin);
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120 streamer.EmitIntValue(b2, 1);
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121 break;
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122 }
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123 }
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124
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125 static void EmitSymbolRefWithOfs(MCStreamer &streamer,
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126 const MCSymbol *Base,
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parents:
diff changeset
127 const MCSymbol *Other) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
128 MCContext &Context = streamer.getContext();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
129 const MCSymbolRefExpr *BaseRef = MCSymbolRefExpr::Create(Base, Context);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
130 const MCSymbolRefExpr *OtherRef = MCSymbolRefExpr::Create(Other, Context);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
131 const MCExpr *Ofs = MCBinaryExpr::CreateSub(OtherRef, BaseRef, Context);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
132 const MCSymbolRefExpr *BaseRefRel = MCSymbolRefExpr::Create(Base,
95c75e76d11b LLVM 3.4
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parents:
diff changeset
133 MCSymbolRefExpr::VK_COFF_IMGREL32,
95c75e76d11b LLVM 3.4
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parents:
diff changeset
134 Context);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
135 streamer.EmitValue(MCBinaryExpr::CreateAdd(BaseRefRel, Ofs, Context), 4);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
136 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
137
95c75e76d11b LLVM 3.4
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diff changeset
138 static void EmitRuntimeFunction(MCStreamer &streamer,
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
139 const WinEH::FrameInfo *info) {
0
95c75e76d11b LLVM 3.4
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diff changeset
140 MCContext &context = streamer.getContext();
95c75e76d11b LLVM 3.4
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parents:
diff changeset
141
95c75e76d11b LLVM 3.4
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diff changeset
142 streamer.EmitValueToAlignment(4);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
143 EmitSymbolRefWithOfs(streamer, info->Function, info->Begin);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
144 EmitSymbolRefWithOfs(streamer, info->Function, info->End);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
145 streamer.EmitValue(MCSymbolRefExpr::Create(info->Symbol,
95c75e76d11b LLVM 3.4
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diff changeset
146 MCSymbolRefExpr::VK_COFF_IMGREL32,
95c75e76d11b LLVM 3.4
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parents:
diff changeset
147 context), 4);
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diff changeset
148 }
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diff changeset
149
77
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parents: 0
diff changeset
150 static void EmitUnwindInfo(MCStreamer &streamer, WinEH::FrameInfo *info) {
0
95c75e76d11b LLVM 3.4
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diff changeset
151 // If this UNWIND_INFO already has a symbol, it's already been emitted.
77
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parents: 0
diff changeset
152 if (info->Symbol)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
153 return;
0
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diff changeset
154
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diff changeset
155 MCContext &context = streamer.getContext();
77
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diff changeset
156 MCSymbol *Label = context.CreateTempSymbol();
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diff changeset
157
0
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diff changeset
158 streamer.EmitValueToAlignment(4);
77
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diff changeset
159 streamer.EmitLabel(Label);
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parents: 0
diff changeset
160 info->Symbol = Label;
0
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diff changeset
161
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diff changeset
162 // Upper 3 bits are the version number (currently 1).
95c75e76d11b LLVM 3.4
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parents:
diff changeset
163 uint8_t flags = 0x01;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
164 if (info->ChainedParent)
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
165 flags |= Win64EH::UNW_ChainInfo << 3;
95c75e76d11b LLVM 3.4
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diff changeset
166 else {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
167 if (info->HandlesUnwind)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
168 flags |= Win64EH::UNW_TerminateHandler << 3;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
169 if (info->HandlesExceptions)
95c75e76d11b LLVM 3.4
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diff changeset
170 flags |= Win64EH::UNW_ExceptionHandler << 3;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
171 }
95c75e76d11b LLVM 3.4
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diff changeset
172 streamer.EmitIntValue(flags, 1);
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parents:
diff changeset
173
95c75e76d11b LLVM 3.4
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parents:
diff changeset
174 if (info->PrologEnd)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
175 EmitAbsDifference(streamer, info->PrologEnd, info->Begin);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
176 else
95c75e76d11b LLVM 3.4
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parents:
diff changeset
177 streamer.EmitIntValue(0, 1);
95c75e76d11b LLVM 3.4
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diff changeset
178
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parents:
diff changeset
179 uint8_t numCodes = CountOfUnwindCodes(info->Instructions);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
180 streamer.EmitIntValue(numCodes, 1);
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diff changeset
181
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diff changeset
182 uint8_t frame = 0;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
183 if (info->LastFrameInst >= 0) {
77
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parents: 0
diff changeset
184 WinEH::Instruction &frameInst = info->Instructions[info->LastFrameInst];
54457678186b LLVM 3.6
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parents: 0
diff changeset
185 assert(frameInst.Operation == Win64EH::UOP_SetFPReg);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
186 frame = (frameInst.Register & 0x0F) | (frameInst.Offset & 0xF0);
0
95c75e76d11b LLVM 3.4
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diff changeset
187 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
188 streamer.EmitIntValue(frame, 1);
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diff changeset
189
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diff changeset
190 // Emit unwind instructions (in reverse order).
95c75e76d11b LLVM 3.4
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parents:
diff changeset
191 uint8_t numInst = info->Instructions.size();
95c75e76d11b LLVM 3.4
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parents:
diff changeset
192 for (uint8_t c = 0; c < numInst; ++c) {
77
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parents: 0
diff changeset
193 WinEH::Instruction inst = info->Instructions.back();
0
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diff changeset
194 info->Instructions.pop_back();
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parents:
diff changeset
195 EmitUnwindCode(streamer, info->Begin, inst);
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diff changeset
196 }
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diff changeset
197
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diff changeset
198 // For alignment purposes, the instruction array will always have an even
95c75e76d11b LLVM 3.4
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diff changeset
199 // number of entries, with the final entry potentially unused (in which case
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diff changeset
200 // the array will be one longer than indicated by the count of unwind codes
95c75e76d11b LLVM 3.4
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parents:
diff changeset
201 // field).
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
202 if (numCodes & 1) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
203 streamer.EmitIntValue(0, 2);
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parents:
diff changeset
204 }
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parents:
diff changeset
205
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
206 if (flags & (Win64EH::UNW_ChainInfo << 3))
95c75e76d11b LLVM 3.4
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parents:
diff changeset
207 EmitRuntimeFunction(streamer, info->ChainedParent);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
208 else if (flags &
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
209 ((Win64EH::UNW_TerminateHandler|Win64EH::UNW_ExceptionHandler) << 3))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
210 streamer.EmitValue(MCSymbolRefExpr::Create(info->ExceptionHandler,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
211 MCSymbolRefExpr::VK_COFF_IMGREL32,
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
212 context), 4);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
213 else if (numCodes == 0) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
214 // The minimum size of an UNWIND_INFO struct is 8 bytes. If we're not
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
215 // a chained unwind info, if there is no handler, and if there are fewer
95c75e76d11b LLVM 3.4
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parents:
diff changeset
216 // than 2 slots used in the unwind code array, we have to pad to 8 bytes.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
217 streamer.EmitIntValue(0, 4);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
218 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
219 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
220
77
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parents: 0
diff changeset
221 namespace Win64EH {
54457678186b LLVM 3.6
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parents: 0
diff changeset
222 void UnwindEmitter::Emit(MCStreamer &Streamer) const {
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parents: 0
diff changeset
223 MCContext &Context = Streamer.getContext();
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
224
77
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parents: 0
diff changeset
225 // Emit the unwind info structs first.
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
226 for (const auto &CFI : Streamer.getWinFrameInfos()) {
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
227 const MCSection *XData =
54457678186b LLVM 3.6
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parents: 0
diff changeset
228 getXDataSection(CFI->Function, Context);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
229 Streamer.SwitchSection(XData);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
230 EmitUnwindInfo(Streamer, CFI);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
231 }
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
232
95c75e76d11b LLVM 3.4
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parents:
diff changeset
233 // Now emit RUNTIME_FUNCTION entries.
77
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parents: 0
diff changeset
234 for (const auto &CFI : Streamer.getWinFrameInfos()) {
54457678186b LLVM 3.6
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parents: 0
diff changeset
235 const MCSection *PData =
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
236 getPDataSection(CFI->Function, Context);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
237 Streamer.SwitchSection(PData);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
238 EmitRuntimeFunction(Streamer, CFI);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
240 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
241
77
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parents: 0
diff changeset
242 void UnwindEmitter::EmitUnwindInfo(MCStreamer &Streamer,
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
243 WinEH::FrameInfo *info) const {
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
244 // Switch sections (the static function above is meant to be called from
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
245 // here and from Emit().
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
246 MCContext &context = Streamer.getContext();
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
247 const MCSection *xdataSect =
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
248 getXDataSection(info->Function, context);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
249 Streamer.SwitchSection(xdataSect);
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
250
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
251 llvm::EmitUnwindInfo(Streamer, info);
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parents: 0
diff changeset
252 }
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parents: 0
diff changeset
253 }
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
254 } // End of namespace llvm
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
255