1 //===-- llvm/CodeGen/MachineModuleInfo.cpp ----------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/CodeGen/MachineModuleInfo.h" 11 12 #include "llvm/Constants.h" 13 #include "llvm/Analysis/ValueTracking.h" 14 #include "llvm/CodeGen/MachineFunctionPass.h" 15 #include "llvm/CodeGen/MachineFunction.h" 16 #include "llvm/CodeGen/Passes.h" 17 #include "llvm/Target/TargetInstrInfo.h" 18 #include "llvm/Target/TargetMachine.h" 19 #include "llvm/Target/TargetOptions.h" 20 #include "llvm/DerivedTypes.h" 21 #include "llvm/GlobalVariable.h" 22 #include "llvm/Intrinsics.h" 23 #include "llvm/Instructions.h" 24 #include "llvm/Module.h" 25 #include "llvm/Support/Dwarf.h" 26 #include "llvm/Support/ErrorHandling.h" 27 using namespace llvm; 28 using namespace llvm::dwarf; 29 30 // Handle the Pass registration stuff necessary to use TargetData's. 31 static RegisterPass<MachineModuleInfo> 32 X("machinemoduleinfo", "Module Information"); 33 char MachineModuleInfo::ID = 0; 34 35 // Out of line virtual method. 36 MachineModuleInfoImpl::~MachineModuleInfoImpl() {} 37 38 //===----------------------------------------------------------------------===// 39 40 MachineModuleInfo::MachineModuleInfo() 41 : ImmutablePass(&ID) 42 , ObjFileMMI(0) 43 , CurCallSite(0) 44 , CallsEHReturn(0) 45 , CallsUnwindInit(0) 46 , DbgInfoAvailable(false) { 47 // Always emit some info, by default "no personality" info. 48 Personalities.push_back(NULL); 49 } 50 51 MachineModuleInfo::~MachineModuleInfo() { 52 delete ObjFileMMI; 53 } 54 55 /// doInitialization - Initialize the state for a new module. 56 /// 57 bool MachineModuleInfo::doInitialization() { 58 return false; 59 } 60 61 /// doFinalization - Tear down the state after completion of a module. 62 /// 63 bool MachineModuleInfo::doFinalization() { 64 return false; 65 } 66 67 /// EndFunction - Discard function meta information. 68 /// 69 void MachineModuleInfo::EndFunction() { 70 // Clean up frame info. 71 FrameMoves.clear(); 72 73 // Clean up exception info. 74 LandingPads.clear(); 75 CallSiteMap.clear(); 76 TypeInfos.clear(); 77 FilterIds.clear(); 78 FilterEnds.clear(); 79 CallsEHReturn = 0; 80 CallsUnwindInit = 0; 81 VariableDbgInfo.clear(); 82 } 83 84 /// AnalyzeModule - Scan the module for global debug information. 85 /// 86 void MachineModuleInfo::AnalyzeModule(Module &M) { 87 // Insert functions in the llvm.used array (but not llvm.compiler.used) into 88 // UsedFunctions. 89 GlobalVariable *GV = M.getGlobalVariable("llvm.used"); 90 if (!GV || !GV->hasInitializer()) return; 91 92 // Should be an array of 'i8*'. 93 ConstantArray *InitList = dyn_cast<ConstantArray>(GV->getInitializer()); 94 if (InitList == 0) return; 95 96 for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) 97 if (Function *F = 98 dyn_cast<Function>(InitList->getOperand(i)->stripPointerCasts())) 99 UsedFunctions.insert(F); 100 } 101 102 //===-EH-------------------------------------------------------------------===// 103 104 /// getOrCreateLandingPadInfo - Find or create an LandingPadInfo for the 105 /// specified MachineBasicBlock. 106 LandingPadInfo &MachineModuleInfo::getOrCreateLandingPadInfo 107 (MachineBasicBlock *LandingPad) { 108 unsigned N = LandingPads.size(); 109 for (unsigned i = 0; i < N; ++i) { 110 LandingPadInfo &LP = LandingPads[i]; 111 if (LP.LandingPadBlock == LandingPad) 112 return LP; 113 } 114 115 LandingPads.push_back(LandingPadInfo(LandingPad)); 116 return LandingPads[N]; 117 } 118 119 /// addInvoke - Provide the begin and end labels of an invoke style call and 120 /// associate it with a try landing pad block. 121 void MachineModuleInfo::addInvoke(MachineBasicBlock *LandingPad, 122 unsigned BeginLabel, unsigned EndLabel) { 123 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 124 LP.BeginLabels.push_back(BeginLabel); 125 LP.EndLabels.push_back(EndLabel); 126 } 127 128 /// addLandingPad - Provide the label of a try LandingPad block. 129 /// 130 unsigned MachineModuleInfo::addLandingPad(MachineBasicBlock *LandingPad) { 131 unsigned LandingPadLabel = NextLabelID(); 132 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 133 LP.LandingPadLabel = LandingPadLabel; 134 return LandingPadLabel; 135 } 136 137 /// addPersonality - Provide the personality function for the exception 138 /// information. 139 void MachineModuleInfo::addPersonality(MachineBasicBlock *LandingPad, 140 Function *Personality) { 141 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 142 LP.Personality = Personality; 143 144 for (unsigned i = 0; i < Personalities.size(); ++i) 145 if (Personalities[i] == Personality) 146 return; 147 148 // If this is the first personality we're adding go 149 // ahead and add it at the beginning. 150 if (Personalities[0] == NULL) 151 Personalities[0] = Personality; 152 else 153 Personalities.push_back(Personality); 154 } 155 156 /// addCatchTypeInfo - Provide the catch typeinfo for a landing pad. 157 /// 158 void MachineModuleInfo::addCatchTypeInfo(MachineBasicBlock *LandingPad, 159 std::vector<GlobalVariable *> &TyInfo) { 160 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 161 for (unsigned N = TyInfo.size(); N; --N) 162 LP.TypeIds.push_back(getTypeIDFor(TyInfo[N - 1])); 163 } 164 165 /// addFilterTypeInfo - Provide the filter typeinfo for a landing pad. 166 /// 167 void MachineModuleInfo::addFilterTypeInfo(MachineBasicBlock *LandingPad, 168 std::vector<GlobalVariable *> &TyInfo) { 169 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 170 std::vector<unsigned> IdsInFilter(TyInfo.size()); 171 for (unsigned I = 0, E = TyInfo.size(); I != E; ++I) 172 IdsInFilter[I] = getTypeIDFor(TyInfo[I]); 173 LP.TypeIds.push_back(getFilterIDFor(IdsInFilter)); 174 } 175 176 /// addCleanup - Add a cleanup action for a landing pad. 177 /// 178 void MachineModuleInfo::addCleanup(MachineBasicBlock *LandingPad) { 179 LandingPadInfo &LP = getOrCreateLandingPadInfo(LandingPad); 180 LP.TypeIds.push_back(0); 181 } 182 183 /// TidyLandingPads - Remap landing pad labels and remove any deleted landing 184 /// pads. 185 void MachineModuleInfo::TidyLandingPads() { 186 for (unsigned i = 0; i != LandingPads.size(); ) { 187 LandingPadInfo &LandingPad = LandingPads[i]; 188 LandingPad.LandingPadLabel = MappedLabel(LandingPad.LandingPadLabel); 189 190 // Special case: we *should* emit LPs with null LP MBB. This indicates 191 // "nounwind" case. 192 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) { 193 LandingPads.erase(LandingPads.begin() + i); 194 continue; 195 } 196 197 for (unsigned j=0; j != LandingPads[i].BeginLabels.size(); ) { 198 unsigned BeginLabel = MappedLabel(LandingPad.BeginLabels[j]); 199 unsigned EndLabel = MappedLabel(LandingPad.EndLabels[j]); 200 201 if (!BeginLabel || !EndLabel) { 202 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j); 203 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j); 204 continue; 205 } 206 207 LandingPad.BeginLabels[j] = BeginLabel; 208 LandingPad.EndLabels[j] = EndLabel; 209 ++j; 210 } 211 212 // Remove landing pads with no try-ranges. 213 if (LandingPads[i].BeginLabels.empty()) { 214 LandingPads.erase(LandingPads.begin() + i); 215 continue; 216 } 217 218 // If there is no landing pad, ensure that the list of typeids is empty. 219 // If the only typeid is a cleanup, this is the same as having no typeids. 220 if (!LandingPad.LandingPadBlock || 221 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0])) 222 LandingPad.TypeIds.clear(); 223 224 ++i; 225 } 226 } 227 228 /// getTypeIDFor - Return the type id for the specified typeinfo. This is 229 /// function wide. 230 unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) { 231 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i) 232 if (TypeInfos[i] == TI) return i + 1; 233 234 TypeInfos.push_back(TI); 235 return TypeInfos.size(); 236 } 237 238 /// getFilterIDFor - Return the filter id for the specified typeinfos. This is 239 /// function wide. 240 int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) { 241 // If the new filter coincides with the tail of an existing filter, then 242 // re-use the existing filter. Folding filters more than this requires 243 // re-ordering filters and/or their elements - probably not worth it. 244 for (std::vector<unsigned>::iterator I = FilterEnds.begin(), 245 E = FilterEnds.end(); I != E; ++I) { 246 unsigned i = *I, j = TyIds.size(); 247 248 while (i && j) 249 if (FilterIds[--i] != TyIds[--j]) 250 goto try_next; 251 252 if (!j) 253 // The new filter coincides with range [i, end) of the existing filter. 254 return -(1 + i); 255 256 try_next:; 257 } 258 259 // Add the new filter. 260 int FilterID = -(1 + FilterIds.size()); 261 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1); 262 for (unsigned I = 0, N = TyIds.size(); I != N; ++I) 263 FilterIds.push_back(TyIds[I]); 264 FilterEnds.push_back(FilterIds.size()); 265 FilterIds.push_back(0); // terminator 266 return FilterID; 267 } 268 269 /// getPersonality - Return the personality function for the current function. 270 Function *MachineModuleInfo::getPersonality() const { 271 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per 272 // function 273 return !LandingPads.empty() ? LandingPads[0].Personality : NULL; 274 } 275 276 /// getPersonalityIndex - Return unique index for current personality 277 /// function. NULL/first personality function should always get zero index. 278 unsigned MachineModuleInfo::getPersonalityIndex() const { 279 const Function* Personality = NULL; 280 281 // Scan landing pads. If there is at least one non-NULL personality - use it. 282 for (unsigned i = 0; i != LandingPads.size(); ++i) 283 if (LandingPads[i].Personality) { 284 Personality = LandingPads[i].Personality; 285 break; 286 } 287 288 for (unsigned i = 0; i < Personalities.size(); ++i) { 289 if (Personalities[i] == Personality) 290 return i; 291 } 292 293 // This will happen if the current personality function is 294 // in the zero index. 295 return 0; 296 } 297 298