1 //===- FindUsedTypes.cpp - Find all Types used by a module ----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
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
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Analysis/FindUsedTypes.h"
17 #include "llvm/Constants.h"
18 #include "llvm/DerivedTypes.h"
19 #include "llvm/Module.h"
20 #include "llvm/Assembly/CachedWriter.h"
21 #include "llvm/Support/InstIterator.h"
24 static RegisterAnalysis<FindUsedTypes>
25 X("printusedtypes", "Find Used Types");
27 // stub to help linkage
28 int FindUsedTypes::stub; // to ensure linkage of this file
30 // IncorporateType - Incorporate one type and all of its subtypes into the
31 // collection of used types.
33 void FindUsedTypes::IncorporateType(const Type *Ty) {
34 // If ty doesn't already exist in the used types map, add it now, otherwise
36 if (!UsedTypes.insert(Ty).second) return; // Already contain Ty.
38 // Make sure to add any types this type references now.
40 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
45 void FindUsedTypes::IncorporateValue(const Value *V) {
46 IncorporateType(V->getType());
48 // If this is a constant, it could be using other types...
49 if (const Constant *C = dyn_cast<Constant>(V)) {
50 if (!isa<GlobalValue>(C))
51 for (User::const_op_iterator OI = C->op_begin(), OE = C->op_end();
53 IncorporateValue(*OI);
58 // run - This incorporates all types used by the specified module
60 bool FindUsedTypes::runOnModule(Module &m) {
61 UsedTypes.clear(); // reset if run multiple times...
63 // Loop over global variables, incorporating their types
64 for (Module::const_global_iterator I = m.global_begin(), E = m.global_end(); I != E; ++I) {
65 IncorporateType(I->getType());
66 if (I->hasInitializer())
67 IncorporateValue(I->getInitializer());
70 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) {
71 IncorporateType(MI->getType());
72 const Function &F = *MI;
74 // Loop over all of the instructions in the function, adding their return
75 // type as well as the types of their operands.
77 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F);
79 const Instruction &I = *II;
81 IncorporateType(I.getType()); // Incorporate the type of the instruction
82 for (User::const_op_iterator OI = I.op_begin(), OE = I.op_end();
84 IncorporateValue(*OI); // Insert inst operand types as well
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.
95 void FindUsedTypes::print(std::ostream &o, const Module *M) const {
96 o << "Types in use by this module:\n";
98 CachedWriter CW(M, o);
99 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(),
100 E = UsedTypes.end(); I != E; ++I)
101 CW << " " << **I << "\n";
103 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(),
104 E = UsedTypes.end(); I != E; ++I)
105 o << " " << **I << "\n";