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/IR/Constants.h" 18#include "llvm/IR/DerivedTypes.h" 19#include "llvm/IR/InstIterator.h" 20#include "llvm/IR/Module.h" 21#include "llvm/Support/raw_ostream.h" 22using namespace llvm; 23 24char FindUsedTypes::ID = 0; 25INITIALIZE_PASS(FindUsedTypes, "print-used-types", 26 "Find Used Types", false, true) 27 28// IncorporateType - Incorporate one type and all of its subtypes into the 29// collection of used types. 30// 31void FindUsedTypes::IncorporateType(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)) 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(); 63 I != E; ++I) { 64 IncorporateType(I->getType()); 65 if (I->hasInitializer()) 66 IncorporateValue(I->getInitializer()); 67 } 68 69 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) { 70 IncorporateType(MI->getType()); 71 const Function &F = *MI; 72 73 // Loop over all of the instructions in the function, adding their return 74 // type as well as the types of their operands. 75 // 76 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F); 77 II != IE; ++II) { 78 const Instruction &I = *II; 79 80 IncorporateType(I.getType()); // Incorporate the type of the instruction 81 for (User::const_op_iterator OI = I.op_begin(), OE = I.op_end(); 82 OI != OE; ++OI) 83 IncorporateValue(*OI); // Insert inst operand types as well 84 } 85 } 86 87 return false; 88} 89 90// Print the types found in the module. If the optional Module parameter is 91// passed in, then the types are printed symbolically if possible, using the 92// symbol table from the module. 93// 94void FindUsedTypes::print(raw_ostream &OS, const Module *M) const { 95 OS << "Types in use by this module:\n"; 96 for (SetVector<Type *>::const_iterator I = UsedTypes.begin(), 97 E = UsedTypes.end(); I != E; ++I) { 98 OS << " " << **I << '\n'; 99 } 100} 101