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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36662 91177308-0d34-0410-b5e6-96231b3b80d8
75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
//===- llvm/Analysis/ValueNumbering.h - Value #'ing Interface ---*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the abstract ValueNumbering interface, which is used as the
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// common interface used by all clients of value numbering information, and
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// implemented by all value numbering implementations.
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//
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// Implementations of this interface must implement the various virtual methods,
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// which automatically provides functionality for the entire suite of client
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// APIs.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_VALUE_NUMBERING_H
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#define LLVM_ANALYSIS_VALUE_NUMBERING_H
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#include <vector>
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#include "llvm/Pass.h"
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namespace llvm {
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class Value;
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class Instruction;
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struct ValueNumbering {
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static char ID; // Class identification, replacement for typeinfo
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virtual ~ValueNumbering(); // We want to be subclassed
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/// getEqualNumberNodes - Return nodes with the same value number as the
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/// specified Value. This fills in the argument vector with any equal values.
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///
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virtual void getEqualNumberNodes(Value *V1,
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std::vector<Value*> &RetVals) const = 0;
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///===-------------------------------------------------------------------===//
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/// Interfaces to update value numbering analysis information as the client
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/// changes the program.
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///
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/// deleteValue - This method should be called whenever an LLVM Value is
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/// deleted from the program, for example when an instruction is found to be
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/// redundant and is eliminated.
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///
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virtual void deleteValue(Value *V) {}
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/// copyValue - This method should be used whenever a preexisting value in the
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/// program is copied or cloned, introducing a new value. Note that analysis
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/// implementations should tolerate clients that use this method to introduce
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/// the same value multiple times: if the analysis already knows about a
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/// value, it should ignore the request.
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///
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virtual void copyValue(Value *From, Value *To) {}
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/// replaceWithNewValue - This method is the obvious combination of the two
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/// above, and it provided as a helper to simplify client code.
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///
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void replaceWithNewValue(Value *Old, Value *New) {
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copyValue(Old, New);
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deleteValue(Old);
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}
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};
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} // End llvm namespace
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// Force any file including this header to get the implementation as well
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FORCE_DEFINING_FILE_TO_BE_LINKED(BasicValueNumbering)
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#endif
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