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//===- llvm/IR/TypeFinder.h - Class to find used struct types ---*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the TypeFinder class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_TYPEFINDER_H
#define LLVM_IR_TYPEFINDER_H
#include "llvm/ADT/DenseSet.h"
#include <cstddef>
#include <vector>
namespace llvm {
class MDNode;
class Module;
class StructType;
class Type;
class Value;
/// TypeFinder - Walk over a module, identifying all of the types that are
/// used by the module.
class TypeFinder {
// To avoid walking constant expressions multiple times and other IR
// objects, we keep several helper maps.
DenseSet<const Value*> VisitedConstants;
DenseSet<const MDNode *> VisitedMetadata;
DenseSet<Type*> VisitedTypes;
std::vector<StructType*> StructTypes;
bool OnlyNamed = false;
public:
TypeFinder() = default;
void run(const Module &M, bool onlyNamed);
void clear();
using iterator = std::vector<StructType*>::iterator;
using const_iterator = std::vector<StructType*>::const_iterator;
iterator begin() { return StructTypes.begin(); }
iterator end() { return StructTypes.end(); }
const_iterator begin() const { return StructTypes.begin(); }
const_iterator end() const { return StructTypes.end(); }
bool empty() const { return StructTypes.empty(); }
size_t size() const { return StructTypes.size(); }
iterator erase(iterator I, iterator E) { return StructTypes.erase(I, E); }
StructType *&operator[](unsigned Idx) { return StructTypes[Idx]; }
DenseSet<const MDNode *> &getVisitedMetadata() { return VisitedMetadata; }
private:
/// incorporateType - This method adds the type to the list of used
/// structures if it's not in there already.
void incorporateType(Type *Ty);
/// incorporateValue - This method is used to walk operand lists finding types
/// hiding in constant expressions and other operands that won't be walked in
/// other ways. GlobalValues, basic blocks, instructions, and inst operands
/// are all explicitly enumerated.
void incorporateValue(const Value *V);
/// incorporateMDNode - This method is used to walk the operands of an MDNode
/// to find types hiding within.
void incorporateMDNode(const MDNode *V);
};
} // end namespace llvm
#endif // LLVM_IR_TYPEFINDER_H
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