FindUsedTypes.cpp revision c758209153ca0f6da6737f25ada269c573fba456
1//===- FindUsedTypes.cpp - Find all Types used by a module ----------------===// 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 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/Assembly/Writer.h" 21#include "llvm/Support/InstIterator.h" 22using namespace llvm; 23 24char FindUsedTypes::ID = 0; 25static RegisterPass<FindUsedTypes> 26X("printusedtypes", "Find Used Types", true, true); 27 28// IncorporateType - Incorporate one type and all of its subtypes into the 29// collection of used types. 30// 31void FindUsedTypes::IncorporateType(const Type *Ty) { 32 // If ty doesn't already exist in the used types map, add it now, otherwise 33 // return. 34 if (!UsedTypes.insert(Ty).second) return; // Already contain Ty. 35 36 // Make sure to add any types this type references now. 37 // 38 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end(); 39 I != E; ++I) 40 IncorporateType(*I); 41} 42 43void FindUsedTypes::IncorporateValue(const Value *V) { 44 IncorporateType(V->getType()); 45 46 // If this is a constant, it could be using other types... 47 if (const Constant *C = dyn_cast<Constant>(V)) { 48 if (!isa<GlobalValue>(C)) 49 for (User::const_op_iterator OI = C->op_begin(), OE = C->op_end(); 50 OI != OE; ++OI) 51 IncorporateValue(*OI); 52 } 53} 54 55 56// run - This incorporates all types used by the specified module 57// 58bool FindUsedTypes::runOnModule(Module &m) { 59 UsedTypes.clear(); // reset if run multiple times... 60 61 // Loop over global variables, incorporating their types 62 for (Module::const_global_iterator I = m.global_begin(), E = m.global_end(); I != E; ++I) { 63 IncorporateType(I->getType()); 64 if (I->hasInitializer()) 65 IncorporateValue(I->getInitializer()); 66 } 67 68 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) { 69 IncorporateType(MI->getType()); 70 const Function &F = *MI; 71 72 // Loop over all of the instructions in the function, adding their return 73 // type as well as the types of their operands. 74 // 75 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F); 76 II != IE; ++II) { 77 const Instruction &I = *II; 78 79 IncorporateType(I.getType()); // Incorporate the type of the instruction 80 for (User::const_op_iterator OI = I.op_begin(), OE = I.op_end(); 81 OI != OE; ++OI) 82 IncorporateValue(*OI); // Insert inst operand types as well 83 } 84 } 85 86 return false; 87} 88 89// Print the types found in the module. If the optional Module parameter is 90// passed in, then the types are printed symbolically if possible, using the 91// symbol table from the module. 92// 93void FindUsedTypes::print(std::ostream &o, const Module *M) const { 94 o << "Types in use by this module:\n"; 95 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(), 96 E = UsedTypes.end(); I != E; ++I) 97 WriteTypeSymbolic(o << " ", *I, M) << "\n"; 98} 99 100// Ensure that this file gets linked in when FindUsedTypes.h is used. 101DEFINING_FILE_FOR(FindUsedTypes) 102