MachineModuleInfo.cpp revision a34ec2290fa441d312ac33a61e6ec6029259bdef
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" 27using namespace llvm; 28using namespace llvm::dwarf; 29 30// Handle the Pass registration stuff necessary to use TargetData's. 31static RegisterPass<MachineModuleInfo> 32X("machinemoduleinfo", "Module Information"); 33char MachineModuleInfo::ID = 0; 34 35// Out of line virtual method. 36MachineModuleInfoImpl::~MachineModuleInfoImpl() {} 37 38//===----------------------------------------------------------------------===// 39 40MachineModuleInfo::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 51MachineModuleInfo::~MachineModuleInfo() { 52 delete ObjFileMMI; 53} 54 55/// doInitialization - Initialize the state for a new module. 56/// 57bool MachineModuleInfo::doInitialization() { 58 return false; 59} 60 61/// doFinalization - Tear down the state after completion of a module. 62/// 63bool MachineModuleInfo::doFinalization() { 64 return false; 65} 66 67/// EndFunction - Discard function meta information. 68/// 69void 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/// 86void 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. 106LandingPadInfo &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. 121void 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/// 130unsigned 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. 139void 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/// 158void 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/// 167void 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/// 178void 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. 185void MachineModuleInfo::TidyLandingPads() { 186 for (unsigned i = 0; i != LandingPads.size(); ) { 187 LandingPadInfo &LandingPad = LandingPads[i]; 188 if (isLabelDeleted(LandingPad.LandingPadLabel)) 189 LandingPad.LandingPadLabel = 0; 190 191 // Special case: we *should* emit LPs with null LP MBB. This indicates 192 // "nounwind" case. 193 if (!LandingPad.LandingPadLabel && LandingPad.LandingPadBlock) { 194 LandingPads.erase(LandingPads.begin() + i); 195 continue; 196 } 197 198 for (unsigned j=0; j != LandingPads[i].BeginLabels.size(); ) { 199 unsigned BeginLabel = LandingPad.BeginLabels[j]; 200 unsigned EndLabel = LandingPad.EndLabels[j]; 201 if (isLabelDeleted(BeginLabel) || isLabelDeleted(EndLabel)) { 202 LandingPad.BeginLabels.erase(LandingPad.BeginLabels.begin() + j); 203 LandingPad.EndLabels.erase(LandingPad.EndLabels.begin() + j); 204 continue; 205 } 206 207 ++j; 208 } 209 210 // Remove landing pads with no try-ranges. 211 if (LandingPads[i].BeginLabels.empty()) { 212 LandingPads.erase(LandingPads.begin() + i); 213 continue; 214 } 215 216 // If there is no landing pad, ensure that the list of typeids is empty. 217 // If the only typeid is a cleanup, this is the same as having no typeids. 218 if (!LandingPad.LandingPadBlock || 219 (LandingPad.TypeIds.size() == 1 && !LandingPad.TypeIds[0])) 220 LandingPad.TypeIds.clear(); 221 222 ++i; 223 } 224} 225 226/// getTypeIDFor - Return the type id for the specified typeinfo. This is 227/// function wide. 228unsigned MachineModuleInfo::getTypeIDFor(GlobalVariable *TI) { 229 for (unsigned i = 0, N = TypeInfos.size(); i != N; ++i) 230 if (TypeInfos[i] == TI) return i + 1; 231 232 TypeInfos.push_back(TI); 233 return TypeInfos.size(); 234} 235 236/// getFilterIDFor - Return the filter id for the specified typeinfos. This is 237/// function wide. 238int MachineModuleInfo::getFilterIDFor(std::vector<unsigned> &TyIds) { 239 // If the new filter coincides with the tail of an existing filter, then 240 // re-use the existing filter. Folding filters more than this requires 241 // re-ordering filters and/or their elements - probably not worth it. 242 for (std::vector<unsigned>::iterator I = FilterEnds.begin(), 243 E = FilterEnds.end(); I != E; ++I) { 244 unsigned i = *I, j = TyIds.size(); 245 246 while (i && j) 247 if (FilterIds[--i] != TyIds[--j]) 248 goto try_next; 249 250 if (!j) 251 // The new filter coincides with range [i, end) of the existing filter. 252 return -(1 + i); 253 254try_next:; 255 } 256 257 // Add the new filter. 258 int FilterID = -(1 + FilterIds.size()); 259 FilterIds.reserve(FilterIds.size() + TyIds.size() + 1); 260 for (unsigned I = 0, N = TyIds.size(); I != N; ++I) 261 FilterIds.push_back(TyIds[I]); 262 FilterEnds.push_back(FilterIds.size()); 263 FilterIds.push_back(0); // terminator 264 return FilterID; 265} 266 267/// getPersonality - Return the personality function for the current function. 268Function *MachineModuleInfo::getPersonality() const { 269 // FIXME: Until PR1414 will be fixed, we're using 1 personality function per 270 // function 271 return !LandingPads.empty() ? LandingPads[0].Personality : NULL; 272} 273 274/// getPersonalityIndex - Return unique index for current personality 275/// function. NULL/first personality function should always get zero index. 276unsigned MachineModuleInfo::getPersonalityIndex() const { 277 const Function* Personality = NULL; 278 279 // Scan landing pads. If there is at least one non-NULL personality - use it. 280 for (unsigned i = 0; i != LandingPads.size(); ++i) 281 if (LandingPads[i].Personality) { 282 Personality = LandingPads[i].Personality; 283 break; 284 } 285 286 for (unsigned i = 0; i < Personalities.size(); ++i) { 287 if (Personalities[i] == Personality) 288 return i; 289 } 290 291 // This will happen if the current personality function is 292 // in the zero index. 293 return 0; 294} 295 296