-//===- PrintSCC.cpp - Enumerate SCCs in some key graphs ---------*- C++ -*-===//
+//===- PrintSCC.cpp - Enumerate SCCs in some key graphs -------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
//
// This file provides passes to print out SCCs in a CFG or a CallGraph.
// Normally, you would not use these passes; instead, you would use the
-// TarjanSCCIterator directly to enumerate SCCs and process them in some way.
-// These passes serve three purposes:
-// (1) As a reference for how to use the TarjanSCCIterator.
+// scc_iterator directly to enumerate SCCs and process them in some way. These
+// passes serve three purposes:
+//
+// (1) As a reference for how to use the scc_iterator.
// (2) To print out the SCCs for a CFG or a CallGraph:
// analyze -cfgscc to print the SCCs in each CFG of a module.
// analyze -cfgscc -stats to print the #SCCs and the maximum SCC size.
// and similarly:
// analyze -callscc [-stats] [-debug] to print SCCs in the CallGraph
//
-// (3) To test the TarjanSCCIterator.
+// (3) To test the scc_iterator.
+//
//===----------------------------------------------------------------------===//
#include "llvm/Pass.h"
#include "llvm/Module.h"
-#include "llvm/Function.h"
-#include "llvm/BasicBlock.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Support/CFG.h"
-#include "Support/TarjanSCCIterator.h"
+#include "Support/SCCIterator.h"
namespace {
+ struct CFGSCC : public FunctionPass {
+ bool runOnFunction(Function& func);
-class CFGSCC: public FunctionPass {
-public:
- bool runOnFunction(Function& func) {
- unsigned long sccNum = 0;
- const SCC<Function*>* nextSCC;
- std::cout << "SCCs for Function " << func.getName() << " in PostOrder:";
- for (TarjanSCC_iterator<Function*> tarjSCCiter = tarj_begin(&func);
- (nextSCC = *tarjSCCiter); ++tarjSCCiter)
- {
- std::cout << "\nSCC #" << ++sccNum << " : ";
- for (SCC<Function*>::const_iterator I=nextSCC->begin(),E=nextSCC->end();
- I != E; ++I)
- std::cout << (*I)->getName() << ", ";
- if (nextSCC->size() == 1 && nextSCC->HasLoop())
- std::cout << " (Has self-loop).";
- }
- std::cout << "\n";
+ void print(std::ostream &O) const { }
- return true;
- }
- void print(std::ostream &O) const { }
-};
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ }
+ };
+ struct CallGraphSCC : public Pass {
+ // run - Print out SCCs in the call graph for the specified module.
+ bool run(Module &M);
-class CallGraphSCC: public Pass {
-public:
- // run - Print out SCCs in the call graph for the specified module.
- bool run(Module& M) {
- CallGraphNode* rootNode = getAnalysis<CallGraph>().getRoot();
- unsigned long sccNum = 0;
- const SCC<CallGraphNode*>* nextSCC;
- std::cout << "SCCs for the program in PostOrder:";
- for (TarjanSCC_iterator<CallGraphNode*> tarjSCCiter = tarj_begin(rootNode);
- (nextSCC = *tarjSCCiter); ++tarjSCCiter)
- {
- std::cout << "\nSCC #" << ++sccNum << " : ";
- for (SCC<CallGraphNode*>::const_iterator I=nextSCC->begin(),
- E=nextSCC->end(); I != E; ++I)
- std::cout << ((*I)->getFunction()? (*I)->getFunction()->getName()
- : std::string("Null CallGraph node"))
- << ", ";
- if (nextSCC->size() == 1 && nextSCC->HasLoop())
- std::cout << " (Has self-loop).";
- }
- std::cout << "\n";
+ void print(std::ostream &O) const { }
- return true;
- }
+ // getAnalysisUsage - This pass requires the CallGraph.
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesAll();
+ AU.addRequired<CallGraph>();
+ }
+ };
+
+ RegisterAnalysis<CFGSCC>
+ Y("cfgscc", "Print SCCs of each function CFG");
- void print(std::ostream &O) const { }
+ RegisterAnalysis<CallGraphSCC>
+ Z("callscc", "Print SCCs of the Call Graph");
+}
- // getAnalysisUsage - This pass requires the CallGraph.
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesAll();
- AU.addRequired<CallGraph>();
+bool CFGSCC::runOnFunction(Function &F) {
+ unsigned sccNum = 0;
+ std::cout << "SCCs for Function " << F.getName() << " in PostOrder:";
+ for (scc_iterator<Function*> SCCI = scc_begin(&F),
+ E = scc_end(&F); SCCI != E; ++SCCI) {
+ std::vector<BasicBlock*> &nextSCC = *SCCI;
+ std::cout << "\nSCC #" << ++sccNum << " : ";
+ for (std::vector<BasicBlock*>::const_iterator I = nextSCC.begin(),
+ E = nextSCC.end(); I != E; ++I)
+ std::cout << (*I)->getName() << ", ";
+ if (nextSCC.size() == 1 && SCCI.hasLoop())
+ std::cout << " (Has self-loop).";
}
-};
+ std::cout << "\n";
+
+ return true;
+}
-static RegisterAnalysis<CFGSCC>
-Y("cfgscc", "Print SCCs of each function CFG");
-static RegisterAnalysis<CallGraphSCC>
-Z("callscc", "Print SCCs of the Call Graph");
+// run - Print out SCCs in the call graph for the specified module.
+bool CallGraphSCC::run(Module &M) {
+ CallGraphNode* rootNode = getAnalysis<CallGraph>().getRoot();
+ unsigned sccNum = 0;
+ std::cout << "SCCs for the program in PostOrder:";
+ for (scc_iterator<CallGraphNode*> SCCI = scc_begin(rootNode),
+ E = scc_end(rootNode); SCCI != E; ++SCCI) {
+ const std::vector<CallGraphNode*> &nextSCC = *SCCI;
+ std::cout << "\nSCC #" << ++sccNum << " : ";
+ for (std::vector<CallGraphNode*>::const_iterator I = nextSCC.begin(),
+ E = nextSCC.end(); I != E; ++I)
+ std::cout << ((*I)->getFunction() ? (*I)->getFunction()->getName()
+ : std::string("Indirect CallGraph node")) << ", ";
+ if (nextSCC.size() == 1 && SCCI.hasLoop())
+ std::cout << " (Has self-loop).";
+ }
+ std::cout << "\n";
+ return true;
}