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annotate lib/CodeGen/AsmPrinter/DwarfException.h @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
parents
children e4204d083e25
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1 //===-- DwarfException.h - Dwarf Exception Framework -----------*- C++ -*--===//
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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 contains support for writing dwarf exception info into asm files.
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11 //
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
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15 #define LLVM_CODEGEN_ASMPRINTER_DWARFEXCEPTION_H
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16
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17 #include "llvm/ADT/DenseMap.h"
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18 #include "llvm/CodeGen/AsmPrinter.h"
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19 #include <vector>
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20
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21 namespace llvm {
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22
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23 template <typename T> class SmallVectorImpl;
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24 struct LandingPadInfo;
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25 class MachineModuleInfo;
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26 class MachineInstr;
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27 class MachineFunction;
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28 class MCAsmInfo;
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29 class MCExpr;
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30 class MCSymbol;
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31 class Function;
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32 class ARMTargetStreamer;
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33 class AsmPrinter;
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34
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35 //===----------------------------------------------------------------------===//
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36 /// DwarfException - Emits Dwarf exception handling directives.
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37 ///
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38 class DwarfException {
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39 protected:
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40 /// Asm - Target of Dwarf emission.
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41 AsmPrinter *Asm;
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42
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43 /// MMI - Collected machine module information.
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44 MachineModuleInfo *MMI;
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45
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46 /// SharedTypeIds - How many leading type ids two landing pads have in common.
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47 static unsigned SharedTypeIds(const LandingPadInfo *L,
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48 const LandingPadInfo *R);
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49
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50 /// PadLT - Order landing pads lexicographically by type id.
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51 static bool PadLT(const LandingPadInfo *L, const LandingPadInfo *R);
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52
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53 /// PadRange - Structure holding a try-range and the associated landing pad.
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54 struct PadRange {
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55 // The index of the landing pad.
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56 unsigned PadIndex;
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57 // The index of the begin and end labels in the landing pad's label lists.
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58 unsigned RangeIndex;
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59 };
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60
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61 typedef DenseMap<MCSymbol *, PadRange> RangeMapType;
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62
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63 /// ActionEntry - Structure describing an entry in the actions table.
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64 struct ActionEntry {
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65 int ValueForTypeID; // The value to write - may not be equal to the type id.
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66 int NextAction;
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67 unsigned Previous;
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68 };
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69
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70 /// CallSiteEntry - Structure describing an entry in the call-site table.
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71 struct CallSiteEntry {
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72 // The 'try-range' is BeginLabel .. EndLabel.
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73 MCSymbol *BeginLabel; // zero indicates the start of the function.
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74 MCSymbol *EndLabel; // zero indicates the end of the function.
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75
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76 // The landing pad starts at PadLabel.
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77 MCSymbol *PadLabel; // zero indicates that there is no landing pad.
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78 unsigned Action;
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79 };
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80
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81 /// ComputeActionsTable - Compute the actions table and gather the first
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82 /// action index for each landing pad site.
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83 unsigned ComputeActionsTable(const SmallVectorImpl<const LandingPadInfo*>&LPs,
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84 SmallVectorImpl<ActionEntry> &Actions,
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85 SmallVectorImpl<unsigned> &FirstActions);
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86
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87 /// CallToNoUnwindFunction - Return `true' if this is a call to a function
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88 /// marked `nounwind'. Return `false' otherwise.
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89 bool CallToNoUnwindFunction(const MachineInstr *MI);
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90
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91 /// ComputeCallSiteTable - Compute the call-site table. The entry for an
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92 /// invoke has a try-range containing the call, a non-zero landing pad and an
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93 /// appropriate action. The entry for an ordinary call has a try-range
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94 /// containing the call and zero for the landing pad and the action. Calls
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95 /// marked 'nounwind' have no entry and must not be contained in the try-range
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96 /// of any entry - they form gaps in the table. Entries must be ordered by
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97 /// try-range address.
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98 void ComputeCallSiteTable(SmallVectorImpl<CallSiteEntry> &CallSites,
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99 const RangeMapType &PadMap,
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100 const SmallVectorImpl<const LandingPadInfo *> &LPs,
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101 const SmallVectorImpl<unsigned> &FirstActions);
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102
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103 /// EmitExceptionTable - Emit landing pads and actions.
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104 ///
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105 /// The general organization of the table is complex, but the basic concepts
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106 /// are easy. First there is a header which describes the location and
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107 /// organization of the three components that follow.
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108 /// 1. The landing pad site information describes the range of code covered
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109 /// by the try. In our case it's an accumulation of the ranges covered
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110 /// by the invokes in the try. There is also a reference to the landing
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111 /// pad that handles the exception once processed. Finally an index into
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112 /// the actions table.
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113 /// 2. The action table, in our case, is composed of pairs of type ids
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114 /// and next action offset. Starting with the action index from the
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115 /// landing pad site, each type Id is checked for a match to the current
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116 /// exception. If it matches then the exception and type id are passed
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117 /// on to the landing pad. Otherwise the next action is looked up. This
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118 /// chain is terminated with a next action of zero. If no type id is
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119 /// found the frame is unwound and handling continues.
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120 /// 3. Type id table contains references to all the C++ typeinfo for all
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121 /// catches in the function. This tables is reversed indexed base 1.
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122 void EmitExceptionTable();
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123
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124 virtual void EmitTypeInfos(unsigned TTypeEncoding);
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125
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126 public:
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127 //===--------------------------------------------------------------------===//
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128 // Main entry points.
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129 //
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130 DwarfException(AsmPrinter *A);
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131 virtual ~DwarfException();
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132
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133 /// EndModule - Emit all exception information that should come after the
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134 /// content.
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135 virtual void EndModule();
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136
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137 /// BeginFunction - Gather pre-function exception information. Assumes being
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138 /// emitted immediately after the function entry point.
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139 virtual void BeginFunction(const MachineFunction *MF);
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140
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141 /// EndFunction - Gather and emit post-function exception information.
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142 virtual void EndFunction();
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143 };
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144
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145 class DwarfCFIException : public DwarfException {
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146 /// shouldEmitPersonality - Per-function flag to indicate if .cfi_personality
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147 /// should be emitted.
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148 bool shouldEmitPersonality;
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149
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150 /// shouldEmitLSDA - Per-function flag to indicate if .cfi_lsda
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151 /// should be emitted.
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152 bool shouldEmitLSDA;
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153
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154 /// shouldEmitMoves - Per-function flag to indicate if frame moves info
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155 /// should be emitted.
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156 bool shouldEmitMoves;
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157
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158 AsmPrinter::CFIMoveType moveTypeModule;
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159
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160 public:
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161 //===--------------------------------------------------------------------===//
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162 // Main entry points.
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163 //
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164 DwarfCFIException(AsmPrinter *A);
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165 virtual ~DwarfCFIException();
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166
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167 /// EndModule - Emit all exception information that should come after the
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168 /// content.
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169 virtual void EndModule();
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170
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171 /// BeginFunction - Gather pre-function exception information. Assumes being
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172 /// emitted immediately after the function entry point.
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173 virtual void BeginFunction(const MachineFunction *MF);
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174
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175 /// EndFunction - Gather and emit post-function exception information.
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176 virtual void EndFunction();
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177 };
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178
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179 class ARMException : public DwarfException {
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180 void EmitTypeInfos(unsigned TTypeEncoding);
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181 ARMTargetStreamer &getTargetStreamer();
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182
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183 public:
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184 //===--------------------------------------------------------------------===//
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185 // Main entry points.
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186 //
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187 ARMException(AsmPrinter *A);
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188 virtual ~ARMException();
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189
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190 /// EndModule - Emit all exception information that should come after the
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191 /// content.
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192 virtual void EndModule();
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193
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194 /// BeginFunction - Gather pre-function exception information. Assumes being
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195 /// emitted immediately after the function entry point.
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196 virtual void BeginFunction(const MachineFunction *MF);
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197
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198 /// EndFunction - Gather and emit post-function exception information.
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199 virtual void EndFunction();
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200 };
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201
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202 class Win64Exception : public DwarfException {
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203 /// shouldEmitPersonality - Per-function flag to indicate if personality
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204 /// info should be emitted.
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205 bool shouldEmitPersonality;
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206
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207 /// shouldEmitLSDA - Per-function flag to indicate if the LSDA
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208 /// should be emitted.
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209 bool shouldEmitLSDA;
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210
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211 /// shouldEmitMoves - Per-function flag to indicate if frame moves info
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212 /// should be emitted.
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213 bool shouldEmitMoves;
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214
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215 public:
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216 //===--------------------------------------------------------------------===//
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217 // Main entry points.
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218 //
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219 Win64Exception(AsmPrinter *A);
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220 virtual ~Win64Exception();
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221
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222 /// EndModule - Emit all exception information that should come after the
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223 /// content.
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224 virtual void EndModule();
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225
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226 /// BeginFunction - Gather pre-function exception information. Assumes being
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227 /// emitted immediately after the function entry point.
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228 virtual void BeginFunction(const MachineFunction *MF);
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229
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230 /// EndFunction - Gather and emit post-function exception information.
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231 virtual void EndFunction();
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232 };
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233
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234 } // End of namespace llvm
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235
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236 #endif