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/Assembly/Writer.h" 18 #include "llvm/IR/Constants.h" 19 #include "llvm/IR/DerivedTypes.h" 20 #include "llvm/IR/Module.h" 21 #include "llvm/Support/InstIterator.h" 22 #include "llvm/Support/raw_ostream.h" 23 using namespace llvm; 24 25 char FindUsedTypes::ID = 0; 26 INITIALIZE_PASS(FindUsedTypes, "print-used-types", 27 "Find Used Types", false, true) 28 29 // IncorporateType - Incorporate one type and all of its subtypes into the 30 // collection of used types. 31 // 32 void FindUsedTypes::IncorporateType(Type *Ty) { 33 // If ty doesn't already exist in the used types map, add it now, otherwise 34 // return. 35 if (!UsedTypes.insert(Ty)) return; // Already contain Ty. 36 37 // Make sure to add any types this type references now. 38 // 39 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end(); 40 I != E; ++I) 41 IncorporateType(*I); 42 } 43 44 void FindUsedTypes::IncorporateValue(const Value *V) { 45 IncorporateType(V->getType()); 46 47 // If this is a constant, it could be using other types... 48 if (const Constant *C = dyn_cast<Constant>(V)) { 49 if (!isa<GlobalValue>(C)) 50 for (User::const_op_iterator OI = C->op_begin(), OE = C->op_end(); 51 OI != OE; ++OI) 52 IncorporateValue(*OI); 53 } 54 } 55 56 57 // run - This incorporates all types used by the specified module 58 // 59 bool FindUsedTypes::runOnModule(Module &m) { 60 UsedTypes.clear(); // reset if run multiple times... 61 62 // Loop over global variables, incorporating their types 63 for (Module::const_global_iterator I = m.global_begin(), E = m.global_end(); 64 I != E; ++I) { 65 IncorporateType(I->getType()); 66 if (I->hasInitializer()) 67 IncorporateValue(I->getInitializer()); 68 } 69 70 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) { 71 IncorporateType(MI->getType()); 72 const Function &F = *MI; 73 74 // Loop over all of the instructions in the function, adding their return 75 // type as well as the types of their operands. 76 // 77 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F); 78 II != IE; ++II) { 79 const Instruction &I = *II; 80 81 IncorporateType(I.getType()); // Incorporate the type of the instruction 82 for (User::const_op_iterator OI = I.op_begin(), OE = I.op_end(); 83 OI != OE; ++OI) 84 IncorporateValue(*OI); // Insert inst operand types as well 85 } 86 } 87 88 return false; 89 } 90 91 // Print the types found in the module. If the optional Module parameter is 92 // passed in, then the types are printed symbolically if possible, using the 93 // symbol table from the module. 94 // 95 void FindUsedTypes::print(raw_ostream &OS, const Module *M) const { 96 OS << "Types in use by this module:\n"; 97 for (SetVector<Type *>::const_iterator I = UsedTypes.begin(), 98 E = UsedTypes.end(); I != E; ++I) { 99 OS << " " << **I << '\n'; 100 } 101 } 102
