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New pass to find types in use by a program

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1232 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2001-11-09 05:27:21 +00:00
parent f26e28711b
commit b61107aa51
1 changed files with 92 additions and 0 deletions
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lib/Analysis/IPA/FindUsedTypes.cpp Normal file
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//===- FindUsedTypes.h - Find all Types used by a module --------------------=//
//
// This pass is used to seek out all of the types in use by the program.
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/FindUsedTypes.h"
#include "llvm/Assembly/CachedWriter.h"
#include "llvm/SymbolTable.h"
#include "llvm/GlobalVariable.h"
#include "llvm/DerivedTypes.h"
// IncorporateType - Incorporate one type and all of its subtypes into the
// collection of used types.
//
void FindUsedTypes::IncorporateType(const Type *Ty) {
if (UsedTypes.count(Ty)) return; // Already contain Ty.
// If ty doesn't already exist in the used types map, add it now.
//
UsedTypes.insert(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);
}
// IncorporateSymbolTable - Add all types referenced by the specified symtab
// into the collection of used types.
//
void FindUsedTypes::IncorporateSymbolTable(const SymbolTable *ST) {
assert(0 && "Unimp");
}
// doPassInitialization - This loops over global constants defined in the
// module, converting them to their new type.
//
bool FindUsedTypes::doPassInitialization(Module *m) {
const Module *M = m;
if (IncludeSymbolTables && M->hasSymbolTable())
IncorporateSymbolTable(M->getSymbolTable()); // Add symtab first...
// Loop over global variables, incorporating their types
for (Module::const_giterator I = M->gbegin(), E = M->gend(); I != E; ++I)
IncorporateType((*I)->getType());
return false;
}
// doPerMethodWork - This incorporates all types used by the specified method
//
bool FindUsedTypes::doPerMethodWork(Method *m) {
const Method *M = m;
if (IncludeSymbolTables && M->hasSymbolTable())
IncorporateSymbolTable(M->getSymbolTable()); // Add symtab first...
// Loop over all of the instructions in the method, adding their return type
// as well as the types of their operands.
//
for (Method::inst_const_iterator II = M->inst_begin(), IE = M->inst_end();
II != IE; ++II) {
const Instruction *I = *II;
const Type *Ty = I->getType();
IncorporateType(Ty); // Incorporate the type of the instruction
for (User::op_const_iterator OI = I->op_begin(), OE = I->op_end();
OI != OE; ++OI)
if ((*OI)->getType() != Ty) // Avoid set lookup in common case
IncorporateType((*OI)->getType()); // 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::printTypes(ostream &o, const Module *M = 0) const {
o << "Types in use by this module:\n";
if (M) {
CachedWriter CW(M, o);
for (set<const Type *>::const_iterator I = UsedTypes.begin(),
E = UsedTypes.end(); I != E; ++I)
CW << " " << *I << endl;
} else
for (set<const Type *>::const_iterator I = UsedTypes.begin(),
E = UsedTypes.end(); I != E; ++I)
o << " " << *I << endl;
}