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43 lines
1.7 KiB
C++
43 lines
1.7 KiB
C++
//===- CallGraphSCCPass.h - Pass that operates BU on call graph -*- C++ -*-===//
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//
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// This file defines the CallGraphSCCPass class, which is used for passes which
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// are implemented as bottom-up traversals on the call graph. Because there may
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// be cycles in the call graph, passes of this type operate on the call-graph in
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// SCC order: that is, they process function bottom-up, except for recursive
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// functions, which they process all at once.
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//
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// These passes are inherently interprocedural, and are required to keep the
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// call graph up-to-date if they do anything which could modify it.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CALL_GRAPH_SCC_PASS_H
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#define LLVM_CALL_GRAPH_SCC_PASS_H
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#include "llvm/Pass.h"
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class CallGraphNode;
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struct CallGraphSCCPass : public Pass {
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/// runOnSCC - This method should be implemented by the subclass to perform
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/// whatever action is necessary for the specified SCC. Note that
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/// non-recursive (or only self-recursive) functions will have an SCC size of
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/// 1, where recursive portions of the call graph will have SCC size > 1.
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///
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virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC) = 0;
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/// run - Run this pass, returning true if a modification was made to the
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/// module argument. This is implemented in terms of the runOnSCC method.
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///
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virtual bool run(Module &M);
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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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virtual void getAnalysisUsage(AnalysisUsage &Info) const;
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};
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#endif
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