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");
17 // stub to help linkage
18 void FindUsedTypes::stub() {}
20 // IncorporateType - Incorporate one type and all of its subtypes into the
21 // collection of used types.
23 void FindUsedTypes::IncorporateType(const Type *Ty) {
24 if (UsedTypes.count(Ty)) return; // Already contain Ty.
26 // If ty doesn't already exist in the used types map, add it now.
30 // Make sure to add any types this type references now.
32 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
38 // run - This incorporates all types used by the specified module
40 bool FindUsedTypes::run(Module &m) {
41 UsedTypes.clear(); // reset if run multiple times...
43 // Loop over global variables, incorporating their types
44 for (Module::const_giterator I = m.gbegin(), E = m.gend(); I != E; ++I)
45 IncorporateType(I->getType());
47 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) {
48 const Function &F = *MI;
50 // Loop over all of the instructions in the function, adding their return
51 // type as well as the types of their operands.
53 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F);
55 const Instruction *I = *II;
56 const Type *Ty = I->getType();
58 IncorporateType(Ty); // Incorporate the type of the instruction
59 for (User::const_op_iterator OI = I->op_begin(), OE = I->op_end();
61 if ((*OI)->getType() != Ty) // Avoid set lookup in common case
62 IncorporateType((*OI)->getType());// Insert inst operand types as well
69 // Print the types found in the module. If the optional Module parameter is
70 // passed in, then the types are printed symbolically if possible, using the
71 // symbol table from the module.
73 void FindUsedTypes::print(std::ostream &o, const Module *M) const {
74 o << "Types in use by this module:\n";
76 CachedWriter CW(M, o);
77 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(),
78 E = UsedTypes.end(); I != E; ++I)
79 CW << " " << *I << "\n";
81 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(),
82 E = UsedTypes.end(); I != E; ++I)
83 o << " " << *I << "\n";