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//===- llvm/Transforms/Utils/OrderedInstructions.h -------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an efficient way to check for dominance relation between 2
// instructions.
//
// This interface dispatches to appropriate dominance check given 2
// instructions, i.e. in case the instructions are in the same basic block,
// OrderedBasicBlock (with instruction numbering and caching) are used.
// Otherwise, dominator tree is used.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H
#define LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/Analysis/OrderedBasicBlock.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Operator.h"
namespace llvm {
class OrderedInstructions {
/// Used to check dominance for instructions in same basic block.
mutable DenseMap<const BasicBlock *, std::unique_ptr<OrderedBasicBlock>>
OBBMap;
/// The dominator tree of the parent function.
DominatorTree *DT;
/// Return true if the first instruction comes before the second in the
/// same basic block. It will create an ordered basic block, if it does
/// not yet exist in OBBMap.
bool localDominates(const Instruction *, const Instruction *) const;
public:
/// Constructor.
OrderedInstructions(DominatorTree *DT) : DT(DT) {}
/// Return true if first instruction dominates the second.
bool dominates(const Instruction *, const Instruction *) const;
/// Return true if the first instruction comes before the second in the
/// dominator tree DFS traversal if they are in different basic blocks,
/// or if the first instruction comes before the second in the same basic
/// block.
bool dfsBefore(const Instruction *, const Instruction *) const;
/// Invalidate the OrderedBasicBlock cache when its basic block changes.
/// i.e. If an instruction is deleted or added to the basic block, the user
/// should call this function to invalidate the OrderedBasicBlock cache for
/// this basic block.
void invalidateBlock(const BasicBlock *BB) { OBBMap.erase(BB); }
};
} // end namespace llvm
#endif // LLVM_TRANSFORMS_UTILS_ORDEREDINSTRUCTIONS_H
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