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annotate lib/CodeGen/LexicalScopes.cpp @ 134:3a76565eade5 LLVM5.0.1

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update 5.0.1
author mir3636
date Sat, 17 Feb 2018 09:57:20 +0900
parents 803732b1fca8
children c2174574ed3a
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1 //===- LexicalScopes.cpp - Collecting lexical scope info ------------------===//
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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 LexicalScopes analysis.
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11 //
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12 // This pass collects lexical scope information and maps machine instructions
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13 // to respective lexical scopes.
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14 //
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15 //===----------------------------------------------------------------------===//
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16
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17 #include "llvm/CodeGen/LexicalScopes.h"
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18 #include "llvm/ADT/DenseMap.h"
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19 #include "llvm/ADT/SmallVector.h"
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20 #include "llvm/CodeGen/MachineBasicBlock.h"
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21 #include "llvm/CodeGen/MachineFunction.h"
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22 #include "llvm/CodeGen/MachineInstr.h"
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23 #include "llvm/IR/DebugInfoMetadata.h"
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24 #include "llvm/IR/Metadata.h"
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25 #include "llvm/Support/Casting.h"
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26 #include "llvm/Support/Compiler.h"
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27 #include "llvm/Support/Debug.h"
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28 #include "llvm/Support/raw_ostream.h"
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29 #include <cassert>
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30 #include <string>
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31 #include <tuple>
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32 #include <utility>
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33
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34 using namespace llvm;
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35
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36 #define DEBUG_TYPE "lexicalscopes"
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37
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38 /// reset - Reset the instance so that it's prepared for another function.
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39 void LexicalScopes::reset() {
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40 MF = nullptr;
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41 CurrentFnLexicalScope = nullptr;
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42 LexicalScopeMap.clear();
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43 AbstractScopeMap.clear();
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44 InlinedLexicalScopeMap.clear();
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45 AbstractScopesList.clear();
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46 }
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47
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48 /// initialize - Scan machine function and constuct lexical scope nest.
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49 void LexicalScopes::initialize(const MachineFunction &Fn) {
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50 reset();
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51 // Don't attempt any lexical scope creation for a NoDebug compile unit.
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52 if (Fn.getFunction().getSubprogram()->getUnit()->getEmissionKind() ==
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53 DICompileUnit::NoDebug)
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54 return;
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55 MF = &Fn;
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56 SmallVector<InsnRange, 4> MIRanges;
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57 DenseMap<const MachineInstr *, LexicalScope *> MI2ScopeMap;
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58 extractLexicalScopes(MIRanges, MI2ScopeMap);
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59 if (CurrentFnLexicalScope) {
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60 constructScopeNest(CurrentFnLexicalScope);
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61 assignInstructionRanges(MIRanges, MI2ScopeMap);
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62 }
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63 }
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64
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65 /// extractLexicalScopes - Extract instruction ranges for each lexical scopes
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66 /// for the given machine function.
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67 void LexicalScopes::extractLexicalScopes(
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68 SmallVectorImpl<InsnRange> &MIRanges,
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69 DenseMap<const MachineInstr *, LexicalScope *> &MI2ScopeMap) {
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70 // Scan each instruction and create scopes. First build working set of scopes.
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71 for (const auto &MBB : *MF) {
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72 const MachineInstr *RangeBeginMI = nullptr;
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73 const MachineInstr *PrevMI = nullptr;
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74 const DILocation *PrevDL = nullptr;
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75 for (const auto &MInsn : MBB) {
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76 // Check if instruction has valid location information.
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77 const DILocation *MIDL = MInsn.getDebugLoc();
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78 if (!MIDL) {
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79 PrevMI = &MInsn;
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80 continue;
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81 }
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82
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83 // If scope has not changed then skip this instruction.
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84 if (MIDL == PrevDL) {
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85 PrevMI = &MInsn;
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86 continue;
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87 }
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88
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89 // Ignore DBG_VALUE and similar instruction that do not contribute to any
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90 // instruction in the output.
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91 if (MInsn.isMetaInstruction())
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92 continue;
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93
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94 if (RangeBeginMI) {
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95 // If we have already seen a beginning of an instruction range and
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96 // current instruction scope does not match scope of first instruction
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97 // in this range then create a new instruction range.
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98 InsnRange R(RangeBeginMI, PrevMI);
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99 MI2ScopeMap[RangeBeginMI] = getOrCreateLexicalScope(PrevDL);
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100 MIRanges.push_back(R);
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101 }
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102
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103 // This is a beginning of a new instruction range.
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104 RangeBeginMI = &MInsn;
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105
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106 // Reset previous markers.
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107 PrevMI = &MInsn;
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108 PrevDL = MIDL;
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109 }
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111 // Create last instruction range.
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112 if (RangeBeginMI && PrevMI && PrevDL) {
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113 InsnRange R(RangeBeginMI, PrevMI);
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114 MIRanges.push_back(R);
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115 MI2ScopeMap[RangeBeginMI] = getOrCreateLexicalScope(PrevDL);
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116 }
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117 }
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118 }
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120 /// findLexicalScope - Find lexical scope, either regular or inlined, for the
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121 /// given DebugLoc. Return NULL if not found.
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122 LexicalScope *LexicalScopes::findLexicalScope(const DILocation *DL) {
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123 DILocalScope *Scope = DL->getScope();
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124 if (!Scope)
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125 return nullptr;
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126
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127 // The scope that we were created with could have an extra file - which
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128 // isn't what we care about in this case.
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129 Scope = Scope->getNonLexicalBlockFileScope();
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130
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131 if (auto *IA = DL->getInlinedAt()) {
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132 auto I = InlinedLexicalScopeMap.find(std::make_pair(Scope, IA));
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133 return I != InlinedLexicalScopeMap.end() ? &I->second : nullptr;
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134 }
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135 return findLexicalScope(Scope);
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136 }
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137
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138 /// getOrCreateLexicalScope - Find lexical scope for the given DebugLoc. If
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139 /// not available then create new lexical scope.
95
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140 LexicalScope *LexicalScopes::getOrCreateLexicalScope(const DILocalScope *Scope,
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141 const DILocation *IA) {
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142 if (IA) {
121
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143 // Skip scopes inlined from a NoDebug compile unit.
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144 if (Scope->getSubprogram()->getUnit()->getEmissionKind() ==
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diff changeset
145 DICompileUnit::NoDebug)
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146 return getOrCreateLexicalScope(IA);
0
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147 // Create an abstract scope for inlined function.
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148 getOrCreateAbstractScope(Scope);
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149 // Create an inlined scope for inlined function.
95
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150 return getOrCreateInlinedScope(Scope, IA);
0
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151 }
33
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152
0
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153 return getOrCreateRegularScope(Scope);
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154 }
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155
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156 /// getOrCreateRegularScope - Find or create a regular lexical scope.
95
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diff changeset
157 LexicalScope *
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diff changeset
158 LexicalScopes::getOrCreateRegularScope(const DILocalScope *Scope) {
120
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diff changeset
159 assert(Scope && "Invalid Scope encoding!");
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diff changeset
160 Scope = Scope->getNonLexicalBlockFileScope();
33
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161
77
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diff changeset
162 auto I = LexicalScopeMap.find(Scope);
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163 if (I != LexicalScopeMap.end())
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164 return &I->second;
0
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165
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166 // FIXME: Should the following dyn_cast be DILexicalBlock?
77
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diff changeset
167 LexicalScope *Parent = nullptr;
95
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168 if (auto *Block = dyn_cast<DILexicalBlockBase>(Scope))
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169 Parent = getOrCreateLexicalScope(Block->getScope());
83
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diff changeset
170 I = LexicalScopeMap.emplace(std::piecewise_construct,
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diff changeset
171 std::forward_as_tuple(Scope),
95
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diff changeset
172 std::forward_as_tuple(Parent, Scope, nullptr,
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diff changeset
173 false)).first;
77
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diff changeset
174
83
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diff changeset
175 if (!Parent) {
134
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diff changeset
176 assert(cast<DISubprogram>(Scope)->describes(&MF->getFunction()));
83
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diff changeset
177 assert(!CurrentFnLexicalScope);
77
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diff changeset
178 CurrentFnLexicalScope = &I->second;
83
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diff changeset
179 }
33
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diff changeset
180
77
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diff changeset
181 return &I->second;
0
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182 }
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183
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184 /// getOrCreateInlinedScope - Find or create an inlined lexical scope.
95
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diff changeset
185 LexicalScope *
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diff changeset
186 LexicalScopes::getOrCreateInlinedScope(const DILocalScope *Scope,
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parents: 83
diff changeset
187 const DILocation *InlinedAt) {
120
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diff changeset
188 assert(Scope && "Invalid Scope encoding!");
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diff changeset
189 Scope = Scope->getNonLexicalBlockFileScope();
95
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parents: 83
diff changeset
190 std::pair<const DILocalScope *, const DILocation *> P(Scope, InlinedAt);
77
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parents: 33
diff changeset
191 auto I = InlinedLexicalScopeMap.find(P);
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parents: 33
diff changeset
192 if (I != InlinedLexicalScopeMap.end())
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diff changeset
193 return &I->second;
0
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diff changeset
194
77
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diff changeset
195 LexicalScope *Parent;
95
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diff changeset
196 if (auto *Block = dyn_cast<DILexicalBlockBase>(Scope))
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diff changeset
197 Parent = getOrCreateInlinedScope(Block->getScope(), InlinedAt);
77
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diff changeset
198 else
95
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diff changeset
199 Parent = getOrCreateLexicalScope(InlinedAt);
77
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diff changeset
200
121
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diff changeset
201 I = InlinedLexicalScopeMap
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diff changeset
202 .emplace(std::piecewise_construct, std::forward_as_tuple(P),
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diff changeset
203 std::forward_as_tuple(Parent, Scope, InlinedAt, false))
83
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parents: 77
diff changeset
204 .first;
77
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diff changeset
205 return &I->second;
0
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diff changeset
206 }
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207
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208 /// getOrCreateAbstractScope - Find or create an abstract lexical scope.
95
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diff changeset
209 LexicalScope *
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diff changeset
210 LexicalScopes::getOrCreateAbstractScope(const DILocalScope *Scope) {
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diff changeset
211 assert(Scope && "Invalid Scope encoding!");
120
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diff changeset
212 Scope = Scope->getNonLexicalBlockFileScope();
77
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diff changeset
213 auto I = AbstractScopeMap.find(Scope);
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parents: 33
diff changeset
214 if (I != AbstractScopeMap.end())
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parents: 33
diff changeset
215 return &I->second;
0
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diff changeset
216
95
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diff changeset
217 // FIXME: Should the following isa be DILexicalBlock?
77
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diff changeset
218 LexicalScope *Parent = nullptr;
95
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diff changeset
219 if (auto *Block = dyn_cast<DILexicalBlockBase>(Scope))
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parents: 83
diff changeset
220 Parent = getOrCreateAbstractScope(Block->getScope());
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diff changeset
221
77
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diff changeset
222 I = AbstractScopeMap.emplace(std::piecewise_construct,
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parents: 33
diff changeset
223 std::forward_as_tuple(Scope),
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parents: 33
diff changeset
224 std::forward_as_tuple(Parent, Scope,
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diff changeset
225 nullptr, true)).first;
95
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diff changeset
226 if (isa<DISubprogram>(Scope))
77
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diff changeset
227 AbstractScopesList.push_back(&I->second);
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diff changeset
228 return &I->second;
0
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diff changeset
229 }
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diff changeset
230
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diff changeset
231 /// constructScopeNest
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parents:
diff changeset
232 void LexicalScopes::constructScopeNest(LexicalScope *Scope) {
33
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parents: 0
diff changeset
233 assert(Scope && "Unable to calculate scope dominance graph!");
0
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parents:
diff changeset
234 SmallVector<LexicalScope *, 4> WorkStack;
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parents:
diff changeset
235 WorkStack.push_back(Scope);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
236 unsigned Counter = 0;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
237 while (!WorkStack.empty()) {
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
238 LexicalScope *WS = WorkStack.back();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
239 const SmallVectorImpl<LexicalScope *> &Children = WS->getChildren();
95c75e76d11b LLVM 3.4
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parents:
diff changeset
240 bool visitedChildren = false;
120
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diff changeset
241 for (auto &ChildScope : Children)
0
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parents:
diff changeset
242 if (!ChildScope->getDFSOut()) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
243 WorkStack.push_back(ChildScope);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
244 visitedChildren = true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
245 ChildScope->setDFSIn(++Counter);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
246 break;
95c75e76d11b LLVM 3.4
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parents:
diff changeset
247 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
248 if (!visitedChildren) {
95c75e76d11b LLVM 3.4
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parents:
diff changeset
249 WorkStack.pop_back();
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parents:
diff changeset
250 WS->setDFSOut(++Counter);
95c75e76d11b LLVM 3.4
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parents:
diff changeset
251 }
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parents:
diff changeset
252 }
95c75e76d11b LLVM 3.4
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parents:
diff changeset
253 }
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parents:
diff changeset
254
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parents:
diff changeset
255 /// assignInstructionRanges - Find ranges of instructions covered by each
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parents:
diff changeset
256 /// lexical scope.
33
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parents: 0
diff changeset
257 void LexicalScopes::assignInstructionRanges(
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
258 SmallVectorImpl<InsnRange> &MIRanges,
e4204d083e25 LLVM 3.5
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 0
diff changeset
259 DenseMap<const MachineInstr *, LexicalScope *> &MI2ScopeMap) {
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
260 LexicalScope *PrevLexicalScope = nullptr;
120
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parents: 95
diff changeset
261 for (const auto &R : MIRanges) {
0
95c75e76d11b LLVM 3.4
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parents:
diff changeset
262 LexicalScope *S = MI2ScopeMap.lookup(R.first);
33
e4204d083e25 LLVM 3.5
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parents: 0
diff changeset
263 assert(S && "Lost LexicalScope for a machine instruction!");
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
264 if (PrevLexicalScope && !PrevLexicalScope->dominates(S))
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
265 PrevLexicalScope->closeInsnRange(S);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
266 S->openInsnRange(R.first);
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
267 S->extendInsnRange(R.second);
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parents:
diff changeset
268 PrevLexicalScope = S;
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parents:
diff changeset
269 }
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parents:
diff changeset
270
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271 if (PrevLexicalScope)
95c75e76d11b LLVM 3.4
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272 PrevLexicalScope->closeInsnRange();
95c75e76d11b LLVM 3.4
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273 }
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274
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275 /// getMachineBasicBlocks - Populate given set using machine basic blocks which
33
e4204d083e25 LLVM 3.5
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parents: 0
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276 /// have machine instructions that belong to lexical scope identified by
0
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277 /// DebugLoc.
33
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diff changeset
278 void LexicalScopes::getMachineBasicBlocks(
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
279 const DILocation *DL, SmallPtrSetImpl<const MachineBasicBlock *> &MBBs) {
121
803732b1fca8 LLVM 5.0
kono
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280 assert(MF && "Method called on a uninitialized LexicalScopes object!");
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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281 MBBs.clear();
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diff changeset
282
0
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283 LexicalScope *Scope = getOrCreateLexicalScope(DL);
95c75e76d11b LLVM 3.4
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284 if (!Scope)
95c75e76d11b LLVM 3.4
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285 return;
33
e4204d083e25 LLVM 3.5
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diff changeset
286
0
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diff changeset
287 if (Scope == CurrentFnLexicalScope) {
77
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
288 for (const auto &MBB : *MF)
54457678186b LLVM 3.6
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 33
diff changeset
289 MBBs.insert(&MBB);
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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290 return;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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291 }
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diff changeset
292
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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293 SmallVectorImpl<InsnRange> &InsnRanges = Scope->getRanges();
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 95
diff changeset
294 for (auto &R : InsnRanges)
0
95c75e76d11b LLVM 3.4
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295 MBBs.insert(R.first->getParent());
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
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296 }
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297
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298 /// dominates - Return true if DebugLoc's lexical scope dominates at least one
95c75e76d11b LLVM 3.4
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parents:
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299 /// machine instruction's lexical scope in a given machine basic block.
95
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Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
300 bool LexicalScopes::dominates(const DILocation *DL, MachineBasicBlock *MBB) {
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
301 assert(MF && "Unexpected uninitialized LexicalScopes object!");
0
95c75e76d11b LLVM 3.4
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302 LexicalScope *Scope = getOrCreateLexicalScope(DL);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
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diff changeset
303 if (!Scope)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
304 return false;
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diff changeset
305
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306 // Current function scope covers all basic blocks in the function.
95c75e76d11b LLVM 3.4
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parents:
diff changeset
307 if (Scope == CurrentFnLexicalScope && MBB->getParent() == MF)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
308 return true;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
309
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
310 bool Result = false;
120
1172e4bd9c6f update 4.0.0
mir3636
parents: 95
diff changeset
311 for (auto &I : *MBB) {
1172e4bd9c6f update 4.0.0
mir3636
parents: 95
diff changeset
312 if (const DILocation *IDL = I.getDebugLoc())
95
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
313 if (LexicalScope *IScope = getOrCreateLexicalScope(IDL))
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
314 if (Scope->dominates(IScope))
afa8332a0e37 LLVM 3.8
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents: 83
diff changeset
315 return true;
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
316 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
317 return Result;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
318 }
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
319
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
320 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
321 LLVM_DUMP_METHOD void LexicalScope::dump(unsigned Indent) const {
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
322 raw_ostream &err = dbgs();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
323 err.indent(Indent);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
324 err << "DFSIn: " << DFSIn << " DFSOut: " << DFSOut << "\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
325 const MDNode *N = Desc;
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
326 err.indent(Indent);
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
327 N->dump();
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
328 if (AbstractScope)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
329 err << std::string(Indent, ' ') << "Abstract Scope\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
330
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
331 if (!Children.empty())
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
332 err << std::string(Indent + 2, ' ') << "Children ...\n";
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
333 for (unsigned i = 0, e = Children.size(); i != e; ++i)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
334 if (Children[i] != this)
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
335 Children[i]->dump(Indent + 2);
121
803732b1fca8 LLVM 5.0
kono
parents: 120
diff changeset
336 }
0
95c75e76d11b LLVM 3.4
Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
parents:
diff changeset
337 #endif