FindUsedTypes.cpp revision a6275ccdf5e1aa208afde56c498e2b13e16442f0
1//===- FindUsedTypes.cpp - Find all Types used by a module ------------------=// 2// 3// This pass is used to seek out all of the types in use by the program. 4// 5//===----------------------------------------------------------------------===// 6 7#include "llvm/Analysis/FindUsedTypes.h" 8#include "llvm/Assembly/CachedWriter.h" 9#include "llvm/SymbolTable.h" 10#include "llvm/DerivedTypes.h" 11#include "llvm/Module.h" 12#include "llvm/Support/InstIterator.h" 13 14static RegisterAnalysis<FindUsedTypes> 15X("printusedtypes", "Find Used Types"); 16AnalysisID FindUsedTypes::ID(AnalysisID::create<FindUsedTypes>()); 17 18// IncorporateType - Incorporate one type and all of its subtypes into the 19// collection of used types. 20// 21void FindUsedTypes::IncorporateType(const Type *Ty) { 22 if (UsedTypes.count(Ty)) return; // Already contain Ty. 23 24 // If ty doesn't already exist in the used types map, add it now. 25 // 26 UsedTypes.insert(Ty); 27 28 // Make sure to add any types this type references now. 29 // 30 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end(); 31 I != E; ++I) 32 IncorporateType(*I); 33} 34 35 36// run - This incorporates all types used by the specified module 37// 38bool FindUsedTypes::run(Module &m) { 39 UsedTypes.clear(); // reset if run multiple times... 40 41 // Loop over global variables, incorporating their types 42 for (Module::const_giterator I = m.gbegin(), E = m.gend(); I != E; ++I) 43 IncorporateType(I->getType()); 44 45 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) { 46 const Function &F = *MI; 47 48 // Loop over all of the instructions in the function, adding their return 49 // type as well as the types of their operands. 50 // 51 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F); 52 II != IE; ++II) { 53 const Instruction *I = *II; 54 const Type *Ty = I->getType(); 55 56 IncorporateType(Ty); // Incorporate the type of the instruction 57 for (User::const_op_iterator OI = I->op_begin(), OE = I->op_end(); 58 OI != OE; ++OI) 59 if ((*OI)->getType() != Ty) // Avoid set lookup in common case 60 IncorporateType((*OI)->getType());// Insert inst operand types as well 61 } 62 } 63 64 return false; 65} 66 67// Print the types found in the module. If the optional Module parameter is 68// passed in, then the types are printed symbolically if possible, using the 69// symbol table from the module. 70// 71void FindUsedTypes::printTypes(std::ostream &o, const Module *M) const { 72 o << "Types in use by this module:\n"; 73 if (M) { 74 CachedWriter CW(M, o); 75 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(), 76 E = UsedTypes.end(); I != E; ++I) 77 CW << " " << *I << "\n"; 78 } else 79 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(), 80 E = UsedTypes.end(); I != E; ++I) 81 o << " " << *I << "\n"; 82} 83