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annotate lib/CodeGen/LexicalScopes.cpp @ 10:e3d004bb4de5

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can tell the Type which is void or __code and set tail call flag only __code.
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Sat, 13 Jul 2013 18:16:49 +0900
parents 9ad51c7bc036
children
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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 #define DEBUG_TYPE "lexicalscopes"
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18 #include "llvm/CodeGen/LexicalScopes.h"
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19 #include "llvm/CodeGen/MachineFunction.h"
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20 #include "llvm/CodeGen/MachineInstr.h"
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21 #include "llvm/DebugInfo.h"
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22 #include "llvm/IR/Function.h"
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23 #include "llvm/Support/Debug.h"
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24 #include "llvm/Support/ErrorHandling.h"
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25 #include "llvm/Support/FormattedStream.h"
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26 using namespace llvm;
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27
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28 LexicalScopes::~LexicalScopes() {
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29 releaseMemory();
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30 }
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31
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32 /// releaseMemory - release memory.
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33 void LexicalScopes::releaseMemory() {
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34 MF = NULL;
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35 CurrentFnLexicalScope = NULL;
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36 DeleteContainerSeconds(LexicalScopeMap);
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37 DeleteContainerSeconds(AbstractScopeMap);
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38 InlinedLexicalScopeMap.clear();
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39 AbstractScopesList.clear();
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40 }
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41
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42 /// initialize - Scan machine function and constuct lexical scope nest.
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43 void LexicalScopes::initialize(const MachineFunction &Fn) {
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44 releaseMemory();
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45 MF = &Fn;
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46 SmallVector<InsnRange, 4> MIRanges;
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47 DenseMap<const MachineInstr *, LexicalScope *> MI2ScopeMap;
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48 extractLexicalScopes(MIRanges, MI2ScopeMap);
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49 if (CurrentFnLexicalScope) {
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50 constructScopeNest(CurrentFnLexicalScope);
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51 assignInstructionRanges(MIRanges, MI2ScopeMap);
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52 }
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53 }
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54
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55 /// extractLexicalScopes - Extract instruction ranges for each lexical scopes
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56 /// for the given machine function.
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57 void LexicalScopes::
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58 extractLexicalScopes(SmallVectorImpl<InsnRange> &MIRanges,
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59 DenseMap<const MachineInstr *, LexicalScope *> &MI2ScopeMap) {
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60
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61 // Scan each instruction and create scopes. First build working set of scopes.
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62 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
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63 I != E; ++I) {
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64 const MachineInstr *RangeBeginMI = NULL;
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65 const MachineInstr *PrevMI = NULL;
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66 DebugLoc PrevDL;
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67 for (MachineBasicBlock::const_iterator II = I->begin(), IE = I->end();
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68 II != IE; ++II) {
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69 const MachineInstr *MInsn = II;
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70
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71 // Check if instruction has valid location information.
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72 const DebugLoc MIDL = MInsn->getDebugLoc();
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73 if (MIDL.isUnknown()) {
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74 PrevMI = MInsn;
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75 continue;
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76 }
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77
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78 // If scope has not changed then skip this instruction.
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79 if (MIDL == PrevDL) {
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80 PrevMI = MInsn;
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81 continue;
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82 }
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83
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84 // Ignore DBG_VALUE. It does not contribute to any instruction in output.
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85 if (MInsn->isDebugValue())
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86 continue;
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87
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88 if (RangeBeginMI) {
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89 // If we have already seen a beginning of an instruction range and
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90 // current instruction scope does not match scope of first instruction
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91 // in this range then create a new instruction range.
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92 InsnRange R(RangeBeginMI, PrevMI);
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93 MI2ScopeMap[RangeBeginMI] = getOrCreateLexicalScope(PrevDL);
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94 MIRanges.push_back(R);
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95 }
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96
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97 // This is a beginning of a new instruction range.
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98 RangeBeginMI = MInsn;
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99
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100 // Reset previous markers.
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101 PrevMI = MInsn;
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102 PrevDL = MIDL;
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103 }
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104
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105 // Create last instruction range.
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106 if (RangeBeginMI && PrevMI && !PrevDL.isUnknown()) {
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107 InsnRange R(RangeBeginMI, PrevMI);
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108 MIRanges.push_back(R);
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109 MI2ScopeMap[RangeBeginMI] = getOrCreateLexicalScope(PrevDL);
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110 }
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111 }
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112 }
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113
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114 /// findLexicalScope - Find lexical scope, either regular or inlined, for the
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115 /// given DebugLoc. Return NULL if not found.
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116 LexicalScope *LexicalScopes::findLexicalScope(DebugLoc DL) {
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117 MDNode *Scope = NULL;
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118 MDNode *IA = NULL;
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119 DL.getScopeAndInlinedAt(Scope, IA, MF->getFunction()->getContext());
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120 if (!Scope) return NULL;
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121
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122 // The scope that we were created with could have an extra file - which
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123 // isn't what we care about in this case.
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124 DIDescriptor D = DIDescriptor(Scope);
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125 if (D.isLexicalBlockFile())
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126 Scope = DILexicalBlockFile(Scope).getScope();
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127
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128 if (IA)
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129 return InlinedLexicalScopeMap.lookup(DebugLoc::getFromDILocation(IA));
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130 return LexicalScopeMap.lookup(Scope);
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131 }
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132
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133 /// getOrCreateLexicalScope - Find lexical scope for the given DebugLoc. If
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134 /// not available then create new lexical scope.
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135 LexicalScope *LexicalScopes::getOrCreateLexicalScope(DebugLoc DL) {
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136 MDNode *Scope = NULL;
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137 MDNode *InlinedAt = NULL;
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138 DL.getScopeAndInlinedAt(Scope, InlinedAt, MF->getFunction()->getContext());
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139
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140 if (InlinedAt) {
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141 // Create an abstract scope for inlined function.
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142 getOrCreateAbstractScope(Scope);
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143 // Create an inlined scope for inlined function.
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144 return getOrCreateInlinedScope(Scope, InlinedAt);
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145 }
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146
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147 return getOrCreateRegularScope(Scope);
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148 }
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149
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150 /// getOrCreateRegularScope - Find or create a regular lexical scope.
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151 LexicalScope *LexicalScopes::getOrCreateRegularScope(MDNode *Scope) {
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152 DIDescriptor D = DIDescriptor(Scope);
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153 if (D.isLexicalBlockFile()) {
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154 Scope = DILexicalBlockFile(Scope).getScope();
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155 D = DIDescriptor(Scope);
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156 }
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157
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158 LexicalScope *WScope = LexicalScopeMap.lookup(Scope);
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159 if (WScope)
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160 return WScope;
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161
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162 LexicalScope *Parent = NULL;
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163 if (D.isLexicalBlock())
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164 Parent = getOrCreateLexicalScope(DebugLoc::getFromDILexicalBlock(Scope));
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165 WScope = new LexicalScope(Parent, DIDescriptor(Scope), NULL, false);
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166 LexicalScopeMap.insert(std::make_pair(Scope, WScope));
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167 if (!Parent && DIDescriptor(Scope).isSubprogram()
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168 && DISubprogram(Scope).describes(MF->getFunction()))
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169 CurrentFnLexicalScope = WScope;
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170
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171 return WScope;
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172 }
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173
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174 /// getOrCreateInlinedScope - Find or create an inlined lexical scope.
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175 LexicalScope *LexicalScopes::getOrCreateInlinedScope(MDNode *Scope,
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176 MDNode *InlinedAt) {
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177 LexicalScope *InlinedScope = LexicalScopeMap.lookup(InlinedAt);
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178 if (InlinedScope)
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179 return InlinedScope;
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180
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181 DebugLoc InlinedLoc = DebugLoc::getFromDILocation(InlinedAt);
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182 InlinedScope = new LexicalScope(getOrCreateLexicalScope(InlinedLoc),
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183 DIDescriptor(Scope), InlinedAt, false);
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184 InlinedLexicalScopeMap[InlinedLoc] = InlinedScope;
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185 LexicalScopeMap[InlinedAt] = InlinedScope;
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186 return InlinedScope;
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187 }
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188
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189 /// getOrCreateAbstractScope - Find or create an abstract lexical scope.
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190 LexicalScope *LexicalScopes::getOrCreateAbstractScope(const MDNode *N) {
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191 assert(N && "Invalid Scope encoding!");
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192
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193 DIDescriptor Scope(N);
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194 if (Scope.isLexicalBlockFile())
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195 Scope = DILexicalBlockFile(Scope).getScope();
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196 LexicalScope *AScope = AbstractScopeMap.lookup(N);
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197 if (AScope)
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198 return AScope;
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199
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200 LexicalScope *Parent = NULL;
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201 if (Scope.isLexicalBlock()) {
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202 DILexicalBlock DB(N);
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203 DIDescriptor ParentDesc = DB.getContext();
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204 Parent = getOrCreateAbstractScope(ParentDesc);
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205 }
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206 AScope = new LexicalScope(Parent, DIDescriptor(N), NULL, true);
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207 AbstractScopeMap[N] = AScope;
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208 if (DIDescriptor(N).isSubprogram())
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209 AbstractScopesList.push_back(AScope);
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210 return AScope;
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211 }
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212
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213 /// constructScopeNest
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214 void LexicalScopes::constructScopeNest(LexicalScope *Scope) {
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215 assert (Scope && "Unable to calculate scop edominance graph!");
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216 SmallVector<LexicalScope *, 4> WorkStack;
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217 WorkStack.push_back(Scope);
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218 unsigned Counter = 0;
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219 while (!WorkStack.empty()) {
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220 LexicalScope *WS = WorkStack.back();
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221 const SmallVector<LexicalScope *, 4> &Children = WS->getChildren();
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222 bool visitedChildren = false;
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223 for (SmallVector<LexicalScope *, 4>::const_iterator SI = Children.begin(),
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224 SE = Children.end(); SI != SE; ++SI) {
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225 LexicalScope *ChildScope = *SI;
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226 if (!ChildScope->getDFSOut()) {
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227 WorkStack.push_back(ChildScope);
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228 visitedChildren = true;
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229 ChildScope->setDFSIn(++Counter);
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230 break;
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231 }
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232 }
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233 if (!visitedChildren) {
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234 WorkStack.pop_back();
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235 WS->setDFSOut(++Counter);
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236 }
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237 }
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238 }
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239
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240 /// assignInstructionRanges - Find ranges of instructions covered by each
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241 /// lexical scope.
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242 void LexicalScopes::
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243 assignInstructionRanges(SmallVectorImpl<InsnRange> &MIRanges,
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244 DenseMap<const MachineInstr *, LexicalScope *> &MI2ScopeMap)
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245 {
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246
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247 LexicalScope *PrevLexicalScope = NULL;
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248 for (SmallVectorImpl<InsnRange>::const_iterator RI = MIRanges.begin(),
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249 RE = MIRanges.end(); RI != RE; ++RI) {
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250 const InsnRange &R = *RI;
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251 LexicalScope *S = MI2ScopeMap.lookup(R.first);
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252 assert (S && "Lost LexicalScope for a machine instruction!");
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253 if (PrevLexicalScope && !PrevLexicalScope->dominates(S))
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254 PrevLexicalScope->closeInsnRange(S);
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255 S->openInsnRange(R.first);
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256 S->extendInsnRange(R.second);
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257 PrevLexicalScope = S;
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258 }
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259
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260 if (PrevLexicalScope)
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261 PrevLexicalScope->closeInsnRange();
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262 }
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263
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264 /// getMachineBasicBlocks - Populate given set using machine basic blocks which
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265 /// have machine instructions that belong to lexical scope identified by
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266 /// DebugLoc.
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267 void LexicalScopes::
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268 getMachineBasicBlocks(DebugLoc DL,
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269 SmallPtrSet<const MachineBasicBlock*, 4> &MBBs) {
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270 MBBs.clear();
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271 LexicalScope *Scope = getOrCreateLexicalScope(DL);
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272 if (!Scope)
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273 return;
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274
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275 if (Scope == CurrentFnLexicalScope) {
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276 for (MachineFunction::const_iterator I = MF->begin(), E = MF->end();
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277 I != E; ++I)
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278 MBBs.insert(I);
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279 return;
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280 }
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281
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282 SmallVector<InsnRange, 4> &InsnRanges = Scope->getRanges();
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283 for (SmallVector<InsnRange, 4>::iterator I = InsnRanges.begin(),
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284 E = InsnRanges.end(); I != E; ++I) {
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285 InsnRange &R = *I;
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286 MBBs.insert(R.first->getParent());
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287 }
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288 }
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289
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290 /// dominates - Return true if DebugLoc's lexical scope dominates at least one
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291 /// machine instruction's lexical scope in a given machine basic block.
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292 bool LexicalScopes::dominates(DebugLoc DL, MachineBasicBlock *MBB) {
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293 LexicalScope *Scope = getOrCreateLexicalScope(DL);
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294 if (!Scope)
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295 return false;
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296
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297 // Current function scope covers all basic blocks in the function.
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298 if (Scope == CurrentFnLexicalScope && MBB->getParent() == MF)
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299 return true;
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300
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301 bool Result = false;
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302 for (MachineBasicBlock::iterator I = MBB->begin(), E = MBB->end();
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303 I != E; ++I) {
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304 DebugLoc IDL = I->getDebugLoc();
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305 if (IDL.isUnknown())
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306 continue;
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307 if (LexicalScope *IScope = getOrCreateLexicalScope(IDL))
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308 if (Scope->dominates(IScope))
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309 return true;
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310 }
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311 return Result;
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312 }
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313
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314 void LexicalScope::anchor() { }
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315
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316 /// dump - Print data structures.
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317 void LexicalScope::dump(unsigned Indent) const {
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318 #ifndef NDEBUG
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319 raw_ostream &err = dbgs();
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320 err.indent(Indent);
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321 err << "DFSIn: " << DFSIn << " DFSOut: " << DFSOut << "\n";
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322 const MDNode *N = Desc;
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323 err.indent(Indent);
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324 N->dump();
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325 if (AbstractScope)
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326 err << std::string(Indent, ' ') << "Abstract Scope\n";
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327
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328 if (!Children.empty())
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329 err << std::string(Indent + 2, ' ') << "Children ...\n";
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330 for (unsigned i = 0, e = Children.size(); i != e; ++i)
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331 if (Children[i] != this)
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332 Children[i]->dump(Indent + 2);
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333 #endif
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334 }
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335