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 AnalysisID FindUsedTypes::ID(AnalysisID::create<FindUsedTypes>());
15 AnalysisID FindUsedTypes::IncludeSymbolTableID(AnalysisID::create<FindUsedTypes>());
17 // IncorporateType - Incorporate one type and all of its subtypes into the
18 // collection of used types.
20 void FindUsedTypes::IncorporateType(const Type *Ty) {
21 if (UsedTypes.count(Ty)) return; // Already contain Ty.
23 // If ty doesn't already exist in the used types map, add it now.
27 // Make sure to add any types this type references now.
29 for (Type::subtype_iterator I = Ty->subtype_begin(), E = Ty->subtype_end();
34 // IncorporateSymbolTable - Add all types referenced by the specified symtab
35 // into the collection of used types.
37 void FindUsedTypes::IncorporateSymbolTable(const SymbolTable *ST) {
41 // run - This incorporates all types used by the specified module
43 bool FindUsedTypes::run(Module &m) {
44 UsedTypes.clear(); // reset if run multiple times...
46 if (IncludeSymbolTables && m.hasSymbolTable())
47 IncorporateSymbolTable(m.getSymbolTable()); // Add symtab first...
49 // Loop over global variables, incorporating their types
50 for (Module::const_giterator I = m.gbegin(), E = m.gend(); I != E; ++I)
51 IncorporateType(I->getType());
53 for (Module::iterator MI = m.begin(), ME = m.end(); MI != ME; ++MI) {
54 const Function &F = *MI;
55 if (IncludeSymbolTables && F.hasSymbolTable())
56 IncorporateSymbolTable(F.getSymbolTable()); // Add symtab first...
58 // Loop over all of the instructions in the function, adding their return
59 // type as well as the types of their operands.
61 for (const_inst_iterator II = inst_begin(F), IE = inst_end(F);
63 const Instruction *I = *II;
64 const Type *Ty = I->getType();
66 IncorporateType(Ty); // Incorporate the type of the instruction
67 for (User::const_op_iterator OI = I->op_begin(), OE = I->op_end();
69 if ((*OI)->getType() != Ty) // Avoid set lookup in common case
70 IncorporateType((*OI)->getType());// Insert inst operand types as well
77 // Print the types found in the module. If the optional Module parameter is
78 // passed in, then the types are printed symbolically if possible, using the
79 // symbol table from the module.
81 void FindUsedTypes::printTypes(std::ostream &o, const Module *M = 0) const {
82 o << "Types in use by this module:\n";
84 CachedWriter CW(M, o);
85 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(),
86 E = UsedTypes.end(); I != E; ++I)
87 CW << " " << *I << "\n";
89 for (std::set<const Type *>::const_iterator I = UsedTypes.begin(),
90 E = UsedTypes.end(); I != E; ++I)
91 o << " " << *I << "\n";