Stephen Hines | 4cc499d | 2011-08-24 19:06:17 -0700 | [diff] [blame] | 1 | //===-- ValueEnumerator.cpp - Number values and types for bitcode writer --===// |
| 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 | // This file implements the ValueEnumerator class. |
| 11 | // |
| 12 | //===----------------------------------------------------------------------===// |
| 13 | |
| 14 | #include "ValueEnumerator.h" |
| 15 | #include "llvm/ADT/SmallPtrSet.h" |
| 16 | #include "llvm/ADT/STLExtras.h" |
| 17 | #include "llvm/Constants.h" |
| 18 | #include "llvm/DerivedTypes.h" |
| 19 | #include "llvm/Module.h" |
| 20 | #include "llvm/ValueSymbolTable.h" |
| 21 | #include "llvm/Instructions.h" |
| 22 | #include <algorithm> |
| 23 | using namespace llvm; |
| 24 | |
| 25 | static bool isIntegerValue(const std::pair<const Value*, unsigned> &V) { |
| 26 | return V.first->getType()->isIntegerTy(); |
| 27 | } |
| 28 | |
| 29 | /// ValueEnumerator - Enumerate module-level information. |
| 30 | ValueEnumerator::ValueEnumerator(const Module *M) { |
| 31 | // Enumerate the global variables. |
| 32 | for (Module::const_global_iterator I = M->global_begin(), |
| 33 | E = M->global_end(); I != E; ++I) |
| 34 | EnumerateValue(I); |
| 35 | |
| 36 | // Enumerate the functions. |
| 37 | for (Module::const_iterator I = M->begin(), E = M->end(); I != E; ++I) { |
| 38 | EnumerateValue(I); |
| 39 | EnumerateAttributes(cast<Function>(I)->getAttributes()); |
| 40 | } |
| 41 | |
| 42 | // Enumerate the aliases. |
| 43 | for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end(); |
| 44 | I != E; ++I) |
| 45 | EnumerateValue(I); |
| 46 | |
| 47 | // Remember what is the cutoff between globalvalue's and other constants. |
| 48 | unsigned FirstConstant = Values.size(); |
| 49 | |
| 50 | // Enumerate the global variable initializers. |
| 51 | for (Module::const_global_iterator I = M->global_begin(), |
| 52 | E = M->global_end(); I != E; ++I) |
| 53 | if (I->hasInitializer()) |
| 54 | EnumerateValue(I->getInitializer()); |
| 55 | |
| 56 | // Enumerate the aliasees. |
| 57 | for (Module::const_alias_iterator I = M->alias_begin(), E = M->alias_end(); |
| 58 | I != E; ++I) |
| 59 | EnumerateValue(I->getAliasee()); |
| 60 | |
| 61 | // Insert constants and metadata that are named at module level into the slot |
| 62 | // pool so that the module symbol table can refer to them... |
| 63 | EnumerateValueSymbolTable(M->getValueSymbolTable()); |
| 64 | EnumerateNamedMetadata(M); |
| 65 | |
| 66 | SmallVector<std::pair<unsigned, MDNode*>, 8> MDs; |
| 67 | |
| 68 | // Enumerate types used by function bodies and argument lists. |
| 69 | for (Module::const_iterator F = M->begin(), E = M->end(); F != E; ++F) { |
| 70 | |
| 71 | for (Function::const_arg_iterator I = F->arg_begin(), E = F->arg_end(); |
| 72 | I != E; ++I) |
| 73 | EnumerateType(I->getType()); |
| 74 | |
| 75 | for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB) |
| 76 | for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E;++I){ |
| 77 | for (User::const_op_iterator OI = I->op_begin(), E = I->op_end(); |
| 78 | OI != E; ++OI) { |
| 79 | if (MDNode *MD = dyn_cast<MDNode>(*OI)) |
| 80 | if (MD->isFunctionLocal() && MD->getFunction()) |
| 81 | // These will get enumerated during function-incorporation. |
| 82 | continue; |
| 83 | EnumerateOperandType(*OI); |
| 84 | } |
| 85 | EnumerateType(I->getType()); |
| 86 | if (const CallInst *CI = dyn_cast<CallInst>(I)) |
| 87 | EnumerateAttributes(CI->getAttributes()); |
| 88 | else if (const InvokeInst *II = dyn_cast<InvokeInst>(I)) |
| 89 | EnumerateAttributes(II->getAttributes()); |
| 90 | |
| 91 | // Enumerate metadata attached with this instruction. |
| 92 | MDs.clear(); |
| 93 | I->getAllMetadataOtherThanDebugLoc(MDs); |
| 94 | for (unsigned i = 0, e = MDs.size(); i != e; ++i) |
| 95 | EnumerateMetadata(MDs[i].second); |
| 96 | |
| 97 | if (!I->getDebugLoc().isUnknown()) { |
| 98 | MDNode *Scope, *IA; |
| 99 | I->getDebugLoc().getScopeAndInlinedAt(Scope, IA, I->getContext()); |
| 100 | if (Scope) EnumerateMetadata(Scope); |
| 101 | if (IA) EnumerateMetadata(IA); |
| 102 | } |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | // Optimize constant ordering. |
| 107 | OptimizeConstants(FirstConstant, Values.size()); |
| 108 | } |
| 109 | |
| 110 | |
| 111 | unsigned ValueEnumerator::getInstructionID(const Instruction *Inst) const { |
| 112 | InstructionMapType::const_iterator I = InstructionMap.find(Inst); |
| 113 | assert(I != InstructionMap.end() && "Instruction is not mapped!"); |
| 114 | return I->second; |
| 115 | } |
| 116 | |
| 117 | void ValueEnumerator::setInstructionID(const Instruction *I) { |
| 118 | InstructionMap[I] = InstructionCount++; |
| 119 | } |
| 120 | |
| 121 | unsigned ValueEnumerator::getValueID(const Value *V) const { |
| 122 | if (isa<MDNode>(V) || isa<MDString>(V)) { |
| 123 | ValueMapType::const_iterator I = MDValueMap.find(V); |
| 124 | assert(I != MDValueMap.end() && "Value not in slotcalculator!"); |
| 125 | return I->second-1; |
| 126 | } |
| 127 | |
| 128 | ValueMapType::const_iterator I = ValueMap.find(V); |
| 129 | assert(I != ValueMap.end() && "Value not in slotcalculator!"); |
| 130 | return I->second-1; |
| 131 | } |
| 132 | |
| 133 | // Optimize constant ordering. |
| 134 | namespace { |
| 135 | struct CstSortPredicate { |
| 136 | ValueEnumerator &VE; |
| 137 | explicit CstSortPredicate(ValueEnumerator &ve) : VE(ve) {} |
| 138 | bool operator()(const std::pair<const Value*, unsigned> &LHS, |
| 139 | const std::pair<const Value*, unsigned> &RHS) { |
| 140 | // Sort by plane. |
| 141 | if (LHS.first->getType() != RHS.first->getType()) |
| 142 | return VE.getTypeID(LHS.first->getType()) < |
| 143 | VE.getTypeID(RHS.first->getType()); |
| 144 | // Then by frequency. |
| 145 | return LHS.second > RHS.second; |
| 146 | } |
| 147 | }; |
| 148 | } |
| 149 | |
| 150 | /// OptimizeConstants - Reorder constant pool for denser encoding. |
| 151 | void ValueEnumerator::OptimizeConstants(unsigned CstStart, unsigned CstEnd) { |
| 152 | if (CstStart == CstEnd || CstStart+1 == CstEnd) return; |
| 153 | |
| 154 | CstSortPredicate P(*this); |
| 155 | std::stable_sort(Values.begin()+CstStart, Values.begin()+CstEnd, P); |
| 156 | |
| 157 | // Ensure that integer constants are at the start of the constant pool. This |
| 158 | // is important so that GEP structure indices come before gep constant exprs. |
| 159 | std::partition(Values.begin()+CstStart, Values.begin()+CstEnd, |
| 160 | isIntegerValue); |
| 161 | |
| 162 | // Rebuild the modified portion of ValueMap. |
| 163 | for (; CstStart != CstEnd; ++CstStart) |
| 164 | ValueMap[Values[CstStart].first] = CstStart+1; |
| 165 | } |
| 166 | |
| 167 | |
| 168 | /// EnumerateValueSymbolTable - Insert all of the values in the specified symbol |
| 169 | /// table into the values table. |
| 170 | void ValueEnumerator::EnumerateValueSymbolTable(const ValueSymbolTable &VST) { |
| 171 | for (ValueSymbolTable::const_iterator VI = VST.begin(), VE = VST.end(); |
| 172 | VI != VE; ++VI) |
| 173 | EnumerateValue(VI->getValue()); |
| 174 | } |
| 175 | |
| 176 | /// EnumerateNamedMetadata - Insert all of the values referenced by |
| 177 | /// named metadata in the specified module. |
| 178 | void ValueEnumerator::EnumerateNamedMetadata(const Module *M) { |
| 179 | for (Module::const_named_metadata_iterator I = M->named_metadata_begin(), |
| 180 | E = M->named_metadata_end(); I != E; ++I) |
| 181 | EnumerateNamedMDNode(I); |
| 182 | } |
| 183 | |
| 184 | void ValueEnumerator::EnumerateNamedMDNode(const NamedMDNode *MD) { |
| 185 | for (unsigned i = 0, e = MD->getNumOperands(); i != e; ++i) |
| 186 | EnumerateMetadata(MD->getOperand(i)); |
| 187 | } |
| 188 | |
| 189 | /// EnumerateMDNodeOperands - Enumerate all non-function-local values |
| 190 | /// and types referenced by the given MDNode. |
| 191 | void ValueEnumerator::EnumerateMDNodeOperands(const MDNode *N) { |
| 192 | for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) { |
| 193 | if (Value *V = N->getOperand(i)) { |
| 194 | if (isa<MDNode>(V) || isa<MDString>(V)) |
| 195 | EnumerateMetadata(V); |
| 196 | else if (!isa<Instruction>(V) && !isa<Argument>(V)) |
| 197 | EnumerateValue(V); |
| 198 | } else |
| 199 | EnumerateType(Type::getVoidTy(N->getContext())); |
| 200 | } |
| 201 | } |
| 202 | |
| 203 | void ValueEnumerator::EnumerateMetadata(const Value *MD) { |
| 204 | assert((isa<MDNode>(MD) || isa<MDString>(MD)) && "Invalid metadata kind"); |
| 205 | |
| 206 | // Enumerate the type of this value. |
| 207 | EnumerateType(MD->getType()); |
| 208 | |
| 209 | const MDNode *N = dyn_cast<MDNode>(MD); |
| 210 | |
| 211 | // In the module-level pass, skip function-local nodes themselves, but |
| 212 | // do walk their operands. |
| 213 | if (N && N->isFunctionLocal() && N->getFunction()) { |
| 214 | EnumerateMDNodeOperands(N); |
| 215 | return; |
| 216 | } |
| 217 | |
| 218 | // Check to see if it's already in! |
| 219 | unsigned &MDValueID = MDValueMap[MD]; |
| 220 | if (MDValueID) { |
| 221 | // Increment use count. |
| 222 | MDValues[MDValueID-1].second++; |
| 223 | return; |
| 224 | } |
| 225 | MDValues.push_back(std::make_pair(MD, 1U)); |
| 226 | MDValueID = MDValues.size(); |
| 227 | |
| 228 | // Enumerate all non-function-local operands. |
| 229 | if (N) |
| 230 | EnumerateMDNodeOperands(N); |
| 231 | } |
| 232 | |
| 233 | /// EnumerateFunctionLocalMetadataa - Incorporate function-local metadata |
| 234 | /// information reachable from the given MDNode. |
| 235 | void ValueEnumerator::EnumerateFunctionLocalMetadata(const MDNode *N) { |
| 236 | assert(N->isFunctionLocal() && N->getFunction() && |
| 237 | "EnumerateFunctionLocalMetadata called on non-function-local mdnode!"); |
| 238 | |
| 239 | // Enumerate the type of this value. |
| 240 | EnumerateType(N->getType()); |
| 241 | |
| 242 | // Check to see if it's already in! |
| 243 | unsigned &MDValueID = MDValueMap[N]; |
| 244 | if (MDValueID) { |
| 245 | // Increment use count. |
| 246 | MDValues[MDValueID-1].second++; |
| 247 | return; |
| 248 | } |
| 249 | MDValues.push_back(std::make_pair(N, 1U)); |
| 250 | MDValueID = MDValues.size(); |
| 251 | |
| 252 | // To incoroporate function-local information visit all function-local |
| 253 | // MDNodes and all function-local values they reference. |
| 254 | for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) |
| 255 | if (Value *V = N->getOperand(i)) { |
| 256 | if (MDNode *O = dyn_cast<MDNode>(V)) { |
| 257 | if (O->isFunctionLocal() && O->getFunction()) |
| 258 | EnumerateFunctionLocalMetadata(O); |
| 259 | } else if (isa<Instruction>(V) || isa<Argument>(V)) |
| 260 | EnumerateValue(V); |
| 261 | } |
| 262 | |
| 263 | // Also, collect all function-local MDNodes for easy access. |
| 264 | FunctionLocalMDs.push_back(N); |
| 265 | } |
| 266 | |
| 267 | void ValueEnumerator::EnumerateValue(const Value *V) { |
| 268 | assert(!V->getType()->isVoidTy() && "Can't insert void values!"); |
| 269 | assert(!isa<MDNode>(V) && !isa<MDString>(V) && |
| 270 | "EnumerateValue doesn't handle Metadata!"); |
| 271 | |
| 272 | // Check to see if it's already in! |
| 273 | unsigned &ValueID = ValueMap[V]; |
| 274 | if (ValueID) { |
| 275 | // Increment use count. |
| 276 | Values[ValueID-1].second++; |
| 277 | return; |
| 278 | } |
| 279 | |
| 280 | // Enumerate the type of this value. |
| 281 | EnumerateType(V->getType()); |
| 282 | |
| 283 | if (const Constant *C = dyn_cast<Constant>(V)) { |
| 284 | if (isa<GlobalValue>(C)) { |
| 285 | // Initializers for globals are handled explicitly elsewhere. |
| 286 | } else if (isa<ConstantArray>(C) && cast<ConstantArray>(C)->isString()) { |
| 287 | // Do not enumerate the initializers for an array of simple characters. |
| 288 | // The initializers just pollute the value table, and we emit the strings |
| 289 | // specially. |
| 290 | } else if (C->getNumOperands()) { |
| 291 | // If a constant has operands, enumerate them. This makes sure that if a |
| 292 | // constant has uses (for example an array of const ints), that they are |
| 293 | // inserted also. |
| 294 | |
| 295 | // We prefer to enumerate them with values before we enumerate the user |
| 296 | // itself. This makes it more likely that we can avoid forward references |
| 297 | // in the reader. We know that there can be no cycles in the constants |
| 298 | // graph that don't go through a global variable. |
| 299 | for (User::const_op_iterator I = C->op_begin(), E = C->op_end(); |
| 300 | I != E; ++I) |
| 301 | if (!isa<BasicBlock>(*I)) // Don't enumerate BB operand to BlockAddress. |
| 302 | EnumerateValue(*I); |
| 303 | |
| 304 | // Finally, add the value. Doing this could make the ValueID reference be |
| 305 | // dangling, don't reuse it. |
| 306 | Values.push_back(std::make_pair(V, 1U)); |
| 307 | ValueMap[V] = Values.size(); |
| 308 | return; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | // Add the value. |
| 313 | Values.push_back(std::make_pair(V, 1U)); |
| 314 | ValueID = Values.size(); |
| 315 | } |
| 316 | |
| 317 | |
| 318 | void ValueEnumerator::EnumerateType(Type *Ty) { |
| 319 | unsigned *TypeID = &TypeMap[Ty]; |
| 320 | |
| 321 | // We've already seen this type. |
| 322 | if (*TypeID) |
| 323 | return; |
| 324 | |
| 325 | // If it is a non-anonymous struct, mark the type as being visited so that we |
| 326 | // don't recursively visit it. This is safe because we allow forward |
| 327 | // references of these in the bitcode reader. |
| 328 | if (StructType *STy = dyn_cast<StructType>(Ty)) |
Logan Chien | 9207a2e | 2011-10-21 15:39:28 +0800 | [diff] [blame] | 329 | if (!STy->isLiteral()) |
Stephen Hines | 4cc499d | 2011-08-24 19:06:17 -0700 | [diff] [blame] | 330 | *TypeID = ~0U; |
| 331 | |
| 332 | // Enumerate all of the subtypes before we enumerate this type. This ensures |
| 333 | // that the type will be enumerated in an order that can be directly built. |
| 334 | for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end(); |
| 335 | I != E; ++I) |
| 336 | EnumerateType(*I); |
| 337 | |
| 338 | // Refresh the TypeID pointer in case the table rehashed. |
| 339 | TypeID = &TypeMap[Ty]; |
| 340 | |
| 341 | // Check to see if we got the pointer another way. This can happen when |
| 342 | // enumerating recursive types that hit the base case deeper than they start. |
| 343 | // |
| 344 | // If this is actually a struct that we are treating as forward ref'able, |
| 345 | // then emit the definition now that all of its contents are available. |
| 346 | if (*TypeID && *TypeID != ~0U) |
| 347 | return; |
| 348 | |
| 349 | // Add this type now that its contents are all happily enumerated. |
| 350 | Types.push_back(Ty); |
| 351 | |
| 352 | *TypeID = Types.size(); |
| 353 | } |
| 354 | |
| 355 | // Enumerate the types for the specified value. If the value is a constant, |
| 356 | // walk through it, enumerating the types of the constant. |
| 357 | void ValueEnumerator::EnumerateOperandType(const Value *V) { |
| 358 | EnumerateType(V->getType()); |
| 359 | |
| 360 | if (const Constant *C = dyn_cast<Constant>(V)) { |
| 361 | // If this constant is already enumerated, ignore it, we know its type must |
| 362 | // be enumerated. |
| 363 | if (ValueMap.count(V)) return; |
| 364 | |
| 365 | // This constant may have operands, make sure to enumerate the types in |
| 366 | // them. |
| 367 | for (unsigned i = 0, e = C->getNumOperands(); i != e; ++i) { |
| 368 | const Value *Op = C->getOperand(i); |
| 369 | |
| 370 | // Don't enumerate basic blocks here, this happens as operands to |
| 371 | // blockaddress. |
| 372 | if (isa<BasicBlock>(Op)) continue; |
| 373 | |
| 374 | EnumerateOperandType(Op); |
| 375 | } |
| 376 | |
| 377 | if (const MDNode *N = dyn_cast<MDNode>(V)) { |
| 378 | for (unsigned i = 0, e = N->getNumOperands(); i != e; ++i) |
| 379 | if (Value *Elem = N->getOperand(i)) |
| 380 | EnumerateOperandType(Elem); |
| 381 | } |
| 382 | } else if (isa<MDString>(V) || isa<MDNode>(V)) |
| 383 | EnumerateMetadata(V); |
| 384 | } |
| 385 | |
| 386 | void ValueEnumerator::EnumerateAttributes(const AttrListPtr &PAL) { |
| 387 | if (PAL.isEmpty()) return; // null is always 0. |
| 388 | // Do a lookup. |
| 389 | unsigned &Entry = AttributeMap[PAL.getRawPointer()]; |
| 390 | if (Entry == 0) { |
| 391 | // Never saw this before, add it. |
| 392 | Attributes.push_back(PAL); |
| 393 | Entry = Attributes.size(); |
| 394 | } |
| 395 | } |
| 396 | |
| 397 | void ValueEnumerator::incorporateFunction(const Function &F) { |
| 398 | InstructionCount = 0; |
| 399 | NumModuleValues = Values.size(); |
| 400 | NumModuleMDValues = MDValues.size(); |
| 401 | |
| 402 | // Adding function arguments to the value table. |
| 403 | for (Function::const_arg_iterator I = F.arg_begin(), E = F.arg_end(); |
| 404 | I != E; ++I) |
| 405 | EnumerateValue(I); |
| 406 | |
| 407 | FirstFuncConstantID = Values.size(); |
| 408 | |
| 409 | // Add all function-level constants to the value table. |
| 410 | for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) { |
| 411 | for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) |
| 412 | for (User::const_op_iterator OI = I->op_begin(), E = I->op_end(); |
| 413 | OI != E; ++OI) { |
| 414 | if ((isa<Constant>(*OI) && !isa<GlobalValue>(*OI)) || |
| 415 | isa<InlineAsm>(*OI)) |
| 416 | EnumerateValue(*OI); |
| 417 | } |
| 418 | BasicBlocks.push_back(BB); |
| 419 | ValueMap[BB] = BasicBlocks.size(); |
| 420 | } |
| 421 | |
| 422 | // Optimize the constant layout. |
| 423 | OptimizeConstants(FirstFuncConstantID, Values.size()); |
| 424 | |
| 425 | // Add the function's parameter attributes so they are available for use in |
| 426 | // the function's instruction. |
| 427 | EnumerateAttributes(F.getAttributes()); |
| 428 | |
| 429 | FirstInstID = Values.size(); |
| 430 | |
| 431 | SmallVector<MDNode *, 8> FnLocalMDVector; |
| 432 | // Add all of the instructions. |
| 433 | for (Function::const_iterator BB = F.begin(), E = F.end(); BB != E; ++BB) { |
| 434 | for (BasicBlock::const_iterator I = BB->begin(), E = BB->end(); I!=E; ++I) { |
| 435 | for (User::const_op_iterator OI = I->op_begin(), E = I->op_end(); |
| 436 | OI != E; ++OI) { |
| 437 | if (MDNode *MD = dyn_cast<MDNode>(*OI)) |
| 438 | if (MD->isFunctionLocal() && MD->getFunction()) |
| 439 | // Enumerate metadata after the instructions they might refer to. |
| 440 | FnLocalMDVector.push_back(MD); |
| 441 | } |
| 442 | |
| 443 | SmallVector<std::pair<unsigned, MDNode*>, 8> MDs; |
| 444 | I->getAllMetadataOtherThanDebugLoc(MDs); |
| 445 | for (unsigned i = 0, e = MDs.size(); i != e; ++i) { |
| 446 | MDNode *N = MDs[i].second; |
| 447 | if (N->isFunctionLocal() && N->getFunction()) |
| 448 | FnLocalMDVector.push_back(N); |
| 449 | } |
| 450 | |
| 451 | if (!I->getType()->isVoidTy()) |
| 452 | EnumerateValue(I); |
| 453 | } |
| 454 | } |
| 455 | |
| 456 | // Add all of the function-local metadata. |
| 457 | for (unsigned i = 0, e = FnLocalMDVector.size(); i != e; ++i) |
| 458 | EnumerateFunctionLocalMetadata(FnLocalMDVector[i]); |
| 459 | } |
| 460 | |
| 461 | void ValueEnumerator::purgeFunction() { |
| 462 | /// Remove purged values from the ValueMap. |
| 463 | for (unsigned i = NumModuleValues, e = Values.size(); i != e; ++i) |
| 464 | ValueMap.erase(Values[i].first); |
| 465 | for (unsigned i = NumModuleMDValues, e = MDValues.size(); i != e; ++i) |
| 466 | MDValueMap.erase(MDValues[i].first); |
| 467 | for (unsigned i = 0, e = BasicBlocks.size(); i != e; ++i) |
| 468 | ValueMap.erase(BasicBlocks[i]); |
| 469 | |
| 470 | Values.resize(NumModuleValues); |
| 471 | MDValues.resize(NumModuleMDValues); |
| 472 | BasicBlocks.clear(); |
| 473 | FunctionLocalMDs.clear(); |
| 474 | } |
| 475 | |
| 476 | static void IncorporateFunctionInfoGlobalBBIDs(const Function *F, |
| 477 | DenseMap<const BasicBlock*, unsigned> &IDMap) { |
| 478 | unsigned Counter = 0; |
| 479 | for (Function::const_iterator BB = F->begin(), E = F->end(); BB != E; ++BB) |
| 480 | IDMap[BB] = ++Counter; |
| 481 | } |
| 482 | |
| 483 | /// getGlobalBasicBlockID - This returns the function-specific ID for the |
| 484 | /// specified basic block. This is relatively expensive information, so it |
| 485 | /// should only be used by rare constructs such as address-of-label. |
| 486 | unsigned ValueEnumerator::getGlobalBasicBlockID(const BasicBlock *BB) const { |
| 487 | unsigned &Idx = GlobalBasicBlockIDs[BB]; |
| 488 | if (Idx != 0) |
| 489 | return Idx-1; |
| 490 | |
| 491 | IncorporateFunctionInfoGlobalBBIDs(BB->getParent(), GlobalBasicBlockIDs); |
| 492 | return getGlobalBasicBlockID(BB); |
| 493 | } |
| 494 | |