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