6bb1cadd56
that builds the following additional llvm/clang tools: - bugpoint - llc - lli - llvm-ar - llvm-as - llvm-bcanalyzer - llvm-diff - llvm-dis - llvm-extract - llvm-ld - llvm-link - llvm-mc - llvm-nm - llvm-objdump - llvm-prof - llvm-ranlib - llvm-rtdyld - llvm-stub - macho-dump - opt These tools are mainly useful for people that want to manipulate llvm bitcode (.bc) and llvm assembly language (.ll) files, or want to tinker with llvm and clang themselves. MFC after: 2 weeks
113 lines
3.9 KiB
C++
113 lines
3.9 KiB
C++
//===- PrintSCC.cpp - Enumerate SCCs in some key graphs -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides passes to print out SCCs in a CFG or a CallGraph.
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// Normally, you would not use these passes; instead, you would use the
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// scc_iterator directly to enumerate SCCs and process them in some way. These
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// passes serve three purposes:
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//
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// (1) As a reference for how to use the scc_iterator.
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// (2) To print out the SCCs for a CFG or a CallGraph:
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// analyze -print-cfg-sccs to print the SCCs in each CFG of a module.
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// analyze -print-cfg-sccs -stats to print the #SCCs and the maximum SCC size.
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// analyze -print-cfg-sccs -debug > /dev/null to watch the algorithm in action.
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//
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// and similarly:
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// analyze -print-callgraph-sccs [-stats] [-debug] to print SCCs in the CallGraph
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//
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// (3) To test the scc_iterator.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Pass.h"
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#include "llvm/Module.h"
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#include "llvm/Analysis/CallGraph.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/ADT/SCCIterator.h"
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using namespace llvm;
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namespace {
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struct CFGSCC : public FunctionPass {
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static char ID; // Pass identification, replacement for typeid
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CFGSCC() : FunctionPass(ID) {}
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bool runOnFunction(Function& func);
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void print(raw_ostream &O, const Module* = 0) const { }
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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};
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struct CallGraphSCC : public ModulePass {
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static char ID; // Pass identification, replacement for typeid
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CallGraphSCC() : ModulePass(ID) {}
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// run - Print out SCCs in the call graph for the specified module.
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bool runOnModule(Module &M);
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void print(raw_ostream &O, const Module* = 0) const { }
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// getAnalysisUsage - This pass requires the CallGraph.
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequired<CallGraph>();
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}
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};
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}
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char CFGSCC::ID = 0;
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static RegisterPass<CFGSCC>
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Y("print-cfg-sccs", "Print SCCs of each function CFG");
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char CallGraphSCC::ID = 0;
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static RegisterPass<CallGraphSCC>
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Z("print-callgraph-sccs", "Print SCCs of the Call Graph");
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bool CFGSCC::runOnFunction(Function &F) {
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unsigned sccNum = 0;
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errs() << "SCCs for Function " << F.getName() << " in PostOrder:";
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for (scc_iterator<Function*> SCCI = scc_begin(&F),
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E = scc_end(&F); SCCI != E; ++SCCI) {
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std::vector<BasicBlock*> &nextSCC = *SCCI;
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errs() << "\nSCC #" << ++sccNum << " : ";
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for (std::vector<BasicBlock*>::const_iterator I = nextSCC.begin(),
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E = nextSCC.end(); I != E; ++I)
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errs() << (*I)->getName() << ", ";
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if (nextSCC.size() == 1 && SCCI.hasLoop())
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errs() << " (Has self-loop).";
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}
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errs() << "\n";
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return true;
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}
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// run - Print out SCCs in the call graph for the specified module.
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bool CallGraphSCC::runOnModule(Module &M) {
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CallGraphNode* rootNode = getAnalysis<CallGraph>().getRoot();
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unsigned sccNum = 0;
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errs() << "SCCs for the program in PostOrder:";
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for (scc_iterator<CallGraphNode*> SCCI = scc_begin(rootNode),
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E = scc_end(rootNode); SCCI != E; ++SCCI) {
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const std::vector<CallGraphNode*> &nextSCC = *SCCI;
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errs() << "\nSCC #" << ++sccNum << " : ";
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for (std::vector<CallGraphNode*>::const_iterator I = nextSCC.begin(),
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E = nextSCC.end(); I != E; ++I)
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errs() << ((*I)->getFunction() ? (*I)->getFunction()->getNameStr()
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: std::string("external node")) << ", ";
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if (nextSCC.size() == 1 && SCCI.hasLoop())
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errs() << " (Has self-loop).";
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}
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errs() << "\n";
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return true;
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}
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