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include/llvm/Transforms/IPO/ConstantMerge.h
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58
include/llvm/Transforms/IPO/ConstantMerge.h
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//===- llvm/Transforms/ConstantMerge.h - Merge duplicate consts --*- C++ -*--=//
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//
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// This file defines the interface to a pass that merges duplicate global
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// constants together into a single constant that is shared. This is useful
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// because some passes (ie TraceValues) insert a lot of string constants into
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// the program, regardless of whether or not they duplicate an existing string.
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//
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// Algorithm: ConstantMerge is designed to build up a map of available constants
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// and elminate duplicates when it is initialized.
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//
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// The DynamicConstantMerge method is a superset of the ConstantMerge algorithm
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// that checks for each method to see if constants have been added to the
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// constant pool since it was last run... if so, it processes them.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_CONSTANTMERGE_H
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#define LLVM_TRANSFORMS_CONSTANTMERGE_H
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#include "llvm/Transforms/Pass.h"
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#include <map>
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class ConstPoolVal;
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class GlobalVariable;
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class ConstantMerge : public Pass {
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protected:
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map<ConstPoolVal*, GlobalVariable*> Constants;
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unsigned LastConstantSeen;
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public:
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inline ConstantMerge() : LastConstantSeen(0) {}
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// mergeDuplicateConstants - Static accessor for clients that don't want to
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// deal with passes.
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//
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static bool mergeDuplicateConstants(Module *M);
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// doPassInitialization - For this pass, process all of the globals in the
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// module, eliminating duplicate constants.
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//
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bool doPassInitialization(Module *M);
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// doPassFinalization - Clean up internal state for this module
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//
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bool doPassFinalization(Module *M) {
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LastConstantSeen = 0;
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Constants.clear();
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return false;
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}
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};
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struct DynamicConstantMerge : public ConstantMerge {
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// doPerMethodWork - Check to see if any globals have been added to the
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// global list for the module. If so, eliminate them.
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//
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bool doPerMethodWork(Method *M);
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};
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#endif
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