1 //===- FindUsedTypes.cpp - Find all Types used by a module ------------------=//
3 // This pass is used to seek out all of the types in use by the program.
5 //===----------------------------------------------------------------------===//
7 #include "llvm/Analysis/FindUsedTypes.h"
8 #include "llvm/Assembly/CachedWriter.h"
9 #include "llvm/SymbolTable.h"
10 #include "llvm/DerivedTypes.h"
11 #include "llvm/Module.h"
12 #include "llvm/Support/InstIterator.h"
14 static RegisterAnalysis<FindUsedTypes>
15 X("printusedtypes", "Find Used Types");
16 AnalysisID FindUsedTypes::ID(AnalysisID::create<FindUsedTypes>());
18 // IncorporateType - Incorporate one type and all of its subtypes into the
19 // collection of used types.
21 void FindUsedTypes::IncorporateType(const Type *Ty) {
22 if (UsedTypes.count(Ty)) return; // Already contain Ty.
24 // If ty doesn't already exist in the used types map, add it now.
28 // Make sure to add any types this type references now.
30 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
36 // run - This incorporates all types used by the specified module
38 bool FindUsedTypes::run(Module &m) {
39 UsedTypes.clear(); // reset if run multiple times...
41 // Loop over global variables, incorporating their types
42 for (Module::const_giterator I = m.gbegin(), E = m.gend(); I != E; ++I)
43 IncorporateType(I->getType());
45 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) {
46 const Function &F = *MI;
48 // Loop over all of the instructions in the function, adding their return
49 // type as well as the types of their operands.
51 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F);
53 const Instruction *I = *II;
54 const Type *Ty = I->getType();
56 IncorporateType(Ty); // Incorporate the type of the instruction
57 for (User::const_op_iterator OI = I->op_begin(), OE = I->op_end();
59 if ((*OI)->getType() != Ty) // Avoid set lookup in common case
60 IncorporateType((*OI)->getType());// Insert inst operand types as well
67 // Print the types found in the module. If the optional Module parameter is
68 // passed in, then the types are printed symbolically if possible, using the
69 // symbol table from the module.
71 void FindUsedTypes::printTypes(std::ostream &o, const Module *M) const {
72 o << "Types in use by this module:\n";
74 CachedWriter CW(M, o);
75 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(),
76 E = UsedTypes.end(); I != E; ++I)
77 CW << " " << *I << "\n";
79 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(),
80 E = UsedTypes.end(); I != E; ++I)
81 o << " " << *I << "\n";