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42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
//===- CallGraphSCCPass.cpp - Pass that operates BU on call graph ---------===//
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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 implements the CallGraphSCCPass class, which is used for passes
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// which are implemented as bottom-up traversals on the call graph. Because
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// there may be cycles in the call graph, passes of this type operate on the
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// call-graph in SCC order: that is, they process function bottom-up, except for
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// recursive functions, which they process all at once.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CallGraphSCCPass.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "Support/SCCIterator.h"
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namespace llvm {
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/// getAnalysisUsage - For this class, we declare that we require and preserve
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/// the call graph. If the derived class implements this method, it should
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/// always explicitly call the implementation here.
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void CallGraphSCCPass::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.addRequired<CallGraph>();
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AU.addPreserved<CallGraph>();
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}
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bool CallGraphSCCPass::run(Module &M) {
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CallGraph &CG = getAnalysis<CallGraph>();
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bool Changed = false;
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for (scc_iterator<CallGraph*> I = scc_begin(&CG), E = scc_end(&CG);
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I != E; ++I)
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Changed = runOnSCC(*I);
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return Changed;
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}
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} // End llvm namespace
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