mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
113 lines
3.9 KiB
C++
113 lines
3.9 KiB
C++
//===- PrintSCC.cpp - Enumerate SCCs in some key graphs -------------------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file 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
|
|
// 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 -print-cfg-sccs to print the SCCs in each CFG of a module.
|
|
// analyze -print-cfg-sccs -stats to print the #SCCs and the maximum SCC size.
|
|
// analyze -print-cfg-sccs -debug > /dev/null to watch the algorithm in action.
|
|
//
|
|
// and similarly:
|
|
// analyze -print-callgraph-sccs [-stats] [-debug] to print SCCs in the CallGraph
|
|
//
|
|
// (3) To test the scc_iterator.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/Analysis/CallGraph.h"
|
|
#include "llvm/Support/CFG.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
#include "llvm/ADT/SCCIterator.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
struct CFGSCC : public FunctionPass {
|
|
static char ID; // Pass identification, replacement for typeid
|
|
CFGSCC() : FunctionPass(ID) {}
|
|
bool runOnFunction(Function& func);
|
|
|
|
void print(raw_ostream &O, const Module* = 0) const { }
|
|
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
}
|
|
};
|
|
|
|
struct CallGraphSCC : public ModulePass {
|
|
static char ID; // Pass identification, replacement for typeid
|
|
CallGraphSCC() : ModulePass(ID) {}
|
|
|
|
// run - Print out SCCs in the call graph for the specified module.
|
|
bool runOnModule(Module &M);
|
|
|
|
void print(raw_ostream &O, const Module* = 0) const { }
|
|
|
|
// getAnalysisUsage - This pass requires the CallGraph.
|
|
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
|
|
AU.setPreservesAll();
|
|
AU.addRequired<CallGraph>();
|
|
}
|
|
};
|
|
|
|
char CFGSCC::ID = 0;
|
|
RegisterPass<CFGSCC>
|
|
Y("print-cfg-sccs", "Print SCCs of each function CFG");
|
|
|
|
char CallGraphSCC::ID = 0;
|
|
RegisterPass<CallGraphSCC>
|
|
Z("print-callgraph-sccs", "Print SCCs of the Call Graph");
|
|
}
|
|
|
|
bool CFGSCC::runOnFunction(Function &F) {
|
|
unsigned sccNum = 0;
|
|
outs() << "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;
|
|
outs() << "\nSCC #" << ++sccNum << " : ";
|
|
for (std::vector<BasicBlock*>::const_iterator I = nextSCC.begin(),
|
|
E = nextSCC.end(); I != E; ++I)
|
|
outs() << (*I)->getName() << ", ";
|
|
if (nextSCC.size() == 1 && SCCI.hasLoop())
|
|
outs() << " (Has self-loop).";
|
|
}
|
|
outs() << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// run - Print out SCCs in the call graph for the specified module.
|
|
bool CallGraphSCC::runOnModule(Module &M) {
|
|
CallGraphNode* rootNode = getAnalysis<CallGraph>().getRoot();
|
|
unsigned sccNum = 0;
|
|
outs() << "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;
|
|
outs() << "\nSCC #" << ++sccNum << " : ";
|
|
for (std::vector<CallGraphNode*>::const_iterator I = nextSCC.begin(),
|
|
E = nextSCC.end(); I != E; ++I)
|
|
outs() << ((*I)->getFunction() ? (*I)->getFunction()->getNameStr()
|
|
: std::string("external node")) << ", ";
|
|
if (nextSCC.size() == 1 && SCCI.hasLoop())
|
|
outs() << " (Has self-loop).";
|
|
}
|
|
outs() << "\n";
|
|
|
|
return true;
|
|
}
|