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ae6eb5bfbe
so we should actually use a UniqueVector to implement it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33935 91177308-0d34-0410-b5e6-96231b3b80d8
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
//===- StableBasicBlockNumbering.h - Provide BB identifiers -----*- 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 class provides a *stable* numbering of basic blocks that does not depend
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// on their address in memory (which is nondeterministic). When requested, this
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// class simply provides a unique ID for each basic block in the function
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// specified and the inverse mapping.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_STABLEBASICBLOCKNUMBERING_H
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#define LLVM_SUPPORT_STABLEBASICBLOCKNUMBERING_H
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#include "llvm/Function.h"
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#include "llvm/ADT/UniqueVector.h"
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namespace llvm {
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class StableBasicBlockNumbering {
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// BBNumbering - Holds the numbering.
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UniqueVector<BasicBlock*> BBNumbering;
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public:
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StableBasicBlockNumbering(Function *F = 0) {
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if (F) compute(*F);
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}
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/// compute - If we have not computed a numbering for the function yet, do
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/// so.
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void compute(Function &F) {
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if (BBNumbering.empty()) {
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for (Function::iterator I = F.begin(), E = F.end(); I != E; ++I)
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BBNumbering.insert(I);
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}
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}
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/// getNumber - Return the ID number for the specified BasicBlock.
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///
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unsigned getNumber(BasicBlock *BB) const {
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unsigned Idx = BBNumbering.idFor(BB);
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assert(Idx && "Invalid basic block or numbering not computed!");
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return Idx-1;
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}
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/// getBlock - Return the BasicBlock corresponding to a particular ID.
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///
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BasicBlock *getBlock(unsigned N) const {
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assert(N < BBNumbering.size() &&
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"Block ID out of range or numbering not computed!");
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return BBNumbering[N+1];
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}
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};
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}
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#endif
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