FindUsedTypes.cpp revision e840434755e2165ac20ec55e9d5ff3d2defac2d2
1//===- FindUsedTypes.cpp - Find all Types used by a module ----------------===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file was developed by the LLVM research group and is distributed under 6// the University of Illinois Open Source License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This pass is used to seek out all of the types in use by the program. Note 11// that this analysis explicitly does not include types only used by the symbol 12// table. 13// 14//===----------------------------------------------------------------------===// 15 16#include "llvm/Analysis/FindUsedTypes.h" 17#include "llvm/Constants.h" 18#include "llvm/DerivedTypes.h" 19#include "llvm/Module.h" 20#include "llvm/SymbolTable.h" 21#include "llvm/Assembly/CachedWriter.h" 22#include "llvm/Support/InstIterator.h" 23using namespace llvm; 24 25static RegisterAnalysis<FindUsedTypes> 26X("printusedtypes", "Find Used Types"); 27 28// stub to help linkage 29void FindUsedTypes::stub() {} 30 31// IncorporateType - Incorporate one type and all of its subtypes into the 32// collection of used types. 33// 34void FindUsedTypes::IncorporateType(const Type *Ty) { 35 // If ty doesn't already exist in the used types map, add it now, otherwise 36 // return. 37 if (!UsedTypes.insert(Ty).second) return; // Already contain Ty. 38 39 // Make sure to add any types this type references now. 40 // 41 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end(); 42 I != E; ++I) 43 IncorporateType(*I); 44} 45 46void FindUsedTypes::IncorporateValue(const Value *V) { 47 IncorporateType(V->getType()); 48 49 // If this is a constant, it could be using other types... 50 if (const Constant *C = dyn_cast<Constant>(V)) { 51 if (!isa<GlobalValue>(C)) 52 for (User::const_op_iterator OI = C->op_begin(), OE = C->op_end(); 53 OI != OE; ++OI) 54 IncorporateValue(*OI); 55 } 56} 57 58 59// run - This incorporates all types used by the specified module 60// 61bool FindUsedTypes::run(Module &m) { 62 UsedTypes.clear(); // reset if run multiple times... 63 64 // Loop over global variables, incorporating their types 65 for (Module::const_giterator I = m.gbegin(), E = m.gend(); I != E; ++I) { 66 IncorporateType(I->getType()); 67 if (I->hasInitializer()) 68 IncorporateValue(I->getInitializer()); 69 } 70 71 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) { 72 IncorporateType(MI->getType()); 73 const Function &F = *MI; 74 75 // Loop over all of the instructions in the function, adding their return 76 // type as well as the types of their operands. 77 // 78 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F); 79 II != IE; ++II) { 80 const Instruction &I = *II; 81 82 IncorporateType(I.getType()); // Incorporate the type of the instruction 83 for (User::const_op_iterator OI = I.op_begin(), OE = I.op_end(); 84 OI != OE; ++OI) 85 IncorporateValue(*OI); // Insert inst operand types as well 86 } 87 } 88 89 return false; 90} 91 92// Print the types found in the module. If the optional Module parameter is 93// passed in, then the types are printed symbolically if possible, using the 94// symbol table from the module. 95// 96void FindUsedTypes::print(std::ostream &o, const Module *M) const { 97 o << "Types in use by this module:\n"; 98 if (M) { 99 CachedWriter CW(M, o); 100 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(), 101 E = UsedTypes.end(); I != E; ++I) 102 CW << " " << **I << "\n"; 103 } else 104 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(), 105 E = UsedTypes.end(); I != E; ++I) 106 o << " " << **I << "\n"; 107} 108