mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-10-19 11:02:59 +02:00
ae65e281f3
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
111 lines
3.9 KiB
C++
111 lines
3.9 KiB
C++
//===- PrintSCC.cpp - Enumerate SCCs in some key graphs -------------------===//
|
|
//
|
|
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
|
|
// See https://llvm.org/LICENSE.txt for license information.
|
|
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// 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/ADT/SCCIterator.h"
|
|
#include "llvm/Analysis/CallGraph.h"
|
|
#include "llvm/IR/CFG.h"
|
|
#include "llvm/IR/Module.h"
|
|
#include "llvm/Pass.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
using namespace llvm;
|
|
|
|
namespace {
|
|
struct CFGSCC : public FunctionPass {
|
|
static char ID; // Pass identification, replacement for typeid
|
|
CFGSCC() : FunctionPass(ID) {}
|
|
bool runOnFunction(Function& func) override;
|
|
|
|
void print(raw_ostream &O, const Module* = nullptr) const override { }
|
|
|
|
void getAnalysisUsage(AnalysisUsage &AU) const override {
|
|
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) override;
|
|
|
|
void print(raw_ostream &O, const Module* = nullptr) const override { }
|
|
|
|
// getAnalysisUsage - This pass requires the CallGraph.
|
|
void getAnalysisUsage(AnalysisUsage &AU) const override {
|
|
AU.setPreservesAll();
|
|
AU.addRequired<CallGraphWrapperPass>();
|
|
}
|
|
};
|
|
}
|
|
|
|
char CFGSCC::ID = 0;
|
|
static RegisterPass<CFGSCC>
|
|
Y("print-cfg-sccs", "Print SCCs of each function CFG");
|
|
|
|
char CallGraphSCC::ID = 0;
|
|
static RegisterPass<CallGraphSCC>
|
|
Z("print-callgraph-sccs", "Print SCCs of the Call Graph");
|
|
|
|
bool CFGSCC::runOnFunction(Function &F) {
|
|
unsigned sccNum = 0;
|
|
errs() << "SCCs for Function " << F.getName() << " in PostOrder:";
|
|
for (scc_iterator<Function*> SCCI = scc_begin(&F); !SCCI.isAtEnd(); ++SCCI) {
|
|
const std::vector<BasicBlock *> &nextSCC = *SCCI;
|
|
errs() << "\nSCC #" << ++sccNum << " : ";
|
|
for (std::vector<BasicBlock*>::const_iterator I = nextSCC.begin(),
|
|
E = nextSCC.end(); I != E; ++I)
|
|
errs() << (*I)->getName() << ", ";
|
|
if (nextSCC.size() == 1 && SCCI.hasLoop())
|
|
errs() << " (Has self-loop).";
|
|
}
|
|
errs() << "\n";
|
|
|
|
return true;
|
|
}
|
|
|
|
|
|
// run - Print out SCCs in the call graph for the specified module.
|
|
bool CallGraphSCC::runOnModule(Module &M) {
|
|
CallGraph &CG = getAnalysis<CallGraphWrapperPass>().getCallGraph();
|
|
unsigned sccNum = 0;
|
|
errs() << "SCCs for the program in PostOrder:";
|
|
for (scc_iterator<CallGraph*> SCCI = scc_begin(&CG); !SCCI.isAtEnd();
|
|
++SCCI) {
|
|
const std::vector<CallGraphNode*> &nextSCC = *SCCI;
|
|
errs() << "\nSCC #" << ++sccNum << " : ";
|
|
for (std::vector<CallGraphNode*>::const_iterator I = nextSCC.begin(),
|
|
E = nextSCC.end(); I != E; ++I)
|
|
errs() << ((*I)->getFunction() ? (*I)->getFunction()->getName()
|
|
: "external node") << ", ";
|
|
if (nextSCC.size() == 1 && SCCI.hasLoop())
|
|
errs() << " (Has self-loop).";
|
|
}
|
|
errs() << "\n";
|
|
|
|
return true;
|
|
}
|