1 //===- CallGraphSCCPass.h - Pass that operates BU on call graph -*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines the CallGraphSCCPass class, which is used for passes which
11 // are implemented as bottom-up traversals on the call graph. Because there may
12 // be cycles in the call graph, passes of this type operate on the call-graph in
13 // SCC order: that is, they process function bottom-up, except for recursive
14 // functions, which they process all at once.
16 // These passes are inherently interprocedural, and are required to keep the
17 // call graph up-to-date if they do anything which could modify it.
19 //===----------------------------------------------------------------------===//
21 #ifndef LLVM_CALL_GRAPH_SCC_PASS_H
22 #define LLVM_CALL_GRAPH_SCC_PASS_H
24 #include "llvm/Pass.h"
32 struct CallGraphSCCPass : public Pass {
34 explicit CallGraphSCCPass(intptr_t pid) : Pass(pid) {}
36 /// doInitialization - This method is called before the SCC's of the program
37 /// has been processed, allowing the pass to do initialization as necessary.
38 virtual bool doInitialization(CallGraph &CG) {
42 /// runOnSCC - This method should be implemented by the subclass to perform
43 /// whatever action is necessary for the specified SCC. Note that
44 /// non-recursive (or only self-recursive) functions will have an SCC size of
45 /// 1, where recursive portions of the call graph will have SCC size > 1.
47 virtual bool runOnSCC(const std::vector<CallGraphNode *> &SCC) = 0;
49 /// doFinalization - This method is called after the SCC's of the program has
50 /// been processed, allowing the pass to do final cleanup as necessary.
51 virtual bool doFinalization(CallGraph &CG) {
55 /// Assign pass manager to manager this pass
56 virtual void assignPassManager(PMStack &PMS,
57 PassManagerType PMT = PMT_CallGraphPassManager);
59 /// Return what kind of Pass Manager can manage this pass.
60 virtual PassManagerType getPotentialPassManagerType() const {
61 return PMT_CallGraphPassManager;
64 /// getAnalysisUsage - For this class, we declare that we require and preserve
65 /// the call graph. If the derived class implements this method, it should
66 /// always explicitly call the implementation here.
67 virtual void getAnalysisUsage(AnalysisUsage &Info) const;
70 } // End llvm namespace