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-//===- CallGraphSCCPass.h - Pass that operates BU on call graph -*- C++ -*-===//
-//
-// The LLVM Compiler Infrastructure
-//
-// This file is distributed under the University of Illinois Open Source
-// License. See LICENSE.TXT for details.
-//
-//===----------------------------------------------------------------------===//
-//
-// This file defines the CallGraphSCCPass class, which is used for passes which
-// are implemented as bottom-up traversals on the call graph. Because there may
-// be cycles in the call graph, passes of this type operate on the call-graph in
-// SCC order: that is, they process function bottom-up, except for recursive
-// functions, which they process all at once.
-//
-// These passes are inherently interprocedural, and are required to keep the
-// call graph up-to-date if they do anything which could modify it.
-//
-//===----------------------------------------------------------------------===//
-
-#ifndef LLVM_CALL_GRAPH_SCC_PASS_H
-#define LLVM_CALL_GRAPH_SCC_PASS_H
-
-#include "llvm/Pass.h"
-#include "llvm/Analysis/CallGraph.h"
-
-namespace llvm {
-
-class CallGraphNode;
-class CallGraph;
-class PMStack;
-class CallGraphSCC;
-
-class CallGraphSCCPass : public Pass {
-public:
- explicit CallGraphSCCPass(char &pid) : Pass(PT_CallGraphSCC, pid) {}
-
- /// createPrinterPass - Get a pass that prints the Module
- /// corresponding to a CallGraph.
- Pass *createPrinterPass(raw_ostream &O, const std::string &Banner) const;
-
- /// doInitialization - This method is called before the SCC's of the program
- /// has been processed, allowing the pass to do initialization as necessary.
- virtual bool doInitialization(CallGraph &CG) {
- return false;
- }
-
- /// runOnSCC - This method should be implemented by the subclass to perform
- /// whatever action is necessary for the specified SCC. Note that
- /// non-recursive (or only self-recursive) functions will have an SCC size of
- /// 1, where recursive portions of the call graph will have SCC size > 1.
- ///
- /// SCC passes that add or delete functions to the SCC are required to update
- /// the SCC list, otherwise stale pointers may be dereferenced.
- ///
- virtual bool runOnSCC(CallGraphSCC &SCC) = 0;
-
- /// doFinalization - This method is called after the SCC's of the program has
- /// been processed, allowing the pass to do final cleanup as necessary.
- virtual bool doFinalization(CallGraph &CG) {
- return false;
- }
-
- /// Assign pass manager to manager this pass
- virtual void assignPassManager(PMStack &PMS,
- PassManagerType PMT);
-
- /// Return what kind of Pass Manager can manage this pass.
- virtual PassManagerType getPotentialPassManagerType() const {
- return PMT_CallGraphPassManager;
- }
-
- /// getAnalysisUsage - For this class, we declare that we require and preserve
- /// the call graph. If the derived class implements this method, it should
- /// always explicitly call the implementation here.
- virtual void getAnalysisUsage(AnalysisUsage &Info) const;
-};
-
-/// CallGraphSCC - This is a single SCC that a CallGraphSCCPass is run on.
-class CallGraphSCC {
- void *Context; // The CGPassManager object that is vending this.
- std::vector<CallGraphNode*> Nodes;
-public:
- CallGraphSCC(void *context) : Context(context) {}
-
- void initialize(CallGraphNode*const*I, CallGraphNode*const*E) {
- Nodes.assign(I, E);
- }
-
- bool isSingular() const { return Nodes.size() == 1; }
- unsigned size() const { return Nodes.size(); }
-
- /// ReplaceNode - This informs the SCC and the pass manager that the specified
- /// Old node has been deleted, and New is to be used in its place.
- void ReplaceNode(CallGraphNode *Old, CallGraphNode *New);
-
- typedef std::vector<CallGraphNode*>::const_iterator iterator;
- iterator begin() const { return Nodes.begin(); }
- iterator end() const { return Nodes.end(); }
-};
-
-} // End llvm namespace
-
-#endif
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