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//===- StableBasicBlockNumbering.h - Provide BB identifiers -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This class provides a *stable* numbering of basic blocks that does not depend
// on their address in memory (which is nondeterministic). When requested, this
// class simply provides a unique ID for each basic block in the function
// specified and the inverse mapping.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_STABLEBASICBLOCKNUMBERING_H
#define LLVM_SUPPORT_STABLEBASICBLOCKNUMBERING_H
#include "llvm/Function.h"
#include "llvm/ADT/UniqueVector.h"
namespace llvm {
class StableBasicBlockNumbering {
// BBNumbering - Holds the numbering.
UniqueVector<BasicBlock*> BBNumbering;
public:
StableBasicBlockNumbering(Function *F = 0) {
if (F) compute(*F);
}
/// compute - If we have not computed a numbering for the function yet, do
/// so.
void compute(Function &F) {
if (BBNumbering.empty()) {
for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
BBNumbering.insert(I);
}
}
/// getNumber - Return the ID number for the specified BasicBlock.
///
unsigned getNumber(BasicBlock *BB) const {
unsigned Idx = BBNumbering.idFor(BB);
assert(Idx && "Invalid basic block or numbering not computed!");
return Idx-1;
}
/// getBlock - Return the BasicBlock corresponding to a particular ID.
///
BasicBlock *getBlock(unsigned N) const {
assert(N < BBNumbering.size() &&
"Block ID out of range or numbering not computed!");
return BBNumbering[N+1];
}
};
}
#endif
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