| //===- FindUsedTypes.cpp - Find all Types used by a module ----------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This pass is used to seek out all of the types in use by the program. Note |
| // that this analysis explicitly does not include types only used by the symbol |
| // table. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/Analysis/FindUsedTypes.h" |
| #include "llvm/Constants.h" |
| #include "llvm/DerivedTypes.h" |
| #include "llvm/Module.h" |
| #include "llvm/Assembly/Writer.h" |
| #include "llvm/Support/InstIterator.h" |
| #include "llvm/Support/raw_ostream.h" |
| using namespace llvm; |
| |
| char FindUsedTypes::ID = 0; |
| INITIALIZE_PASS(FindUsedTypes, "print-used-types", |
| "Find Used Types", false, true) |
| |
| // IncorporateType - Incorporate one type and all of its subtypes into the |
| // collection of used types. |
| // |
| void FindUsedTypes::IncorporateType(Type *Ty) { |
| // If ty doesn't already exist in the used types map, add it now, otherwise |
| // return. |
| if (!UsedTypes.insert(Ty)) return; // Already contain Ty. |
| |
| // Make sure to add any types this type references now. |
| // |
| for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end(); |
| I != E; ++I) |
| IncorporateType(*I); |
| } |
| |
| void FindUsedTypes::IncorporateValue(const Value *V) { |
| IncorporateType(V->getType()); |
| |
| // If this is a constant, it could be using other types... |
| if (const Constant *C = dyn_cast<Constant>(V)) { |
| if (!isa<GlobalValue>(C)) |
| for (User::const_op_iterator OI = C->op_begin(), OE = C->op_end(); |
| OI != OE; ++OI) |
| IncorporateValue(*OI); |
| } |
| } |
| |
| |
| // run - This incorporates all types used by the specified module |
| // |
| bool FindUsedTypes::runOnModule(Module &m) { |
| UsedTypes.clear(); // reset if run multiple times... |
| |
| // Loop over global variables, incorporating their types |
| for (Module::const_global_iterator I = m.global_begin(), E = m.global_end(); |
| I != E; ++I) { |
| IncorporateType(I->getType()); |
| if (I->hasInitializer()) |
| IncorporateValue(I->getInitializer()); |
| } |
| |
| for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) { |
| IncorporateType(MI->getType()); |
| const Function &F = *MI; |
| |
| // Loop over all of the instructions in the function, adding their return |
| // type as well as the types of their operands. |
| // |
| for (const_inst_iterator II = inst_begin(F), IE = inst_end(F); |
| II != IE; ++II) { |
| const Instruction &I = *II; |
| |
| IncorporateType(I.getType()); // Incorporate the type of the instruction |
| for (User::const_op_iterator OI = I.op_begin(), OE = I.op_end(); |
| OI != OE; ++OI) |
| IncorporateValue(*OI); // Insert inst operand types as well |
| } |
| } |
| |
| return false; |
| } |
| |
| // Print the types found in the module. If the optional Module parameter is |
| // passed in, then the types are printed symbolically if possible, using the |
| // symbol table from the module. |
| // |
| void FindUsedTypes::print(raw_ostream &OS, const Module *M) const { |
| OS << "Types in use by this module:\n"; |
| for (SetVector<Type *>::const_iterator I = UsedTypes.begin(), |
| E = UsedTypes.end(); I != E; ++I) { |
| OS << " " << **I << '\n'; |
| } |
| } |