1 //===- CFGSCCPrinter.cpp --------------------------------------------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "llvm/Analysis/CFGSCCPrinter.h"
10 #include "llvm/ADT/SCCIterator.h"
11 #include "llvm/IR/CFG.h"
12 
13 using namespace llvm;
14 
15 PreservedAnalyses CFGSCCPrinterPass::run(Function &F,
16                                          FunctionAnalysisManager &AM) {
17   unsigned SccNum = 0;
18   OS << "SCCs for Function " << F.getName() << " in PostOrder:";
19   for (scc_iterator<Function *> SCCI = scc_begin(&F); !SCCI.isAtEnd(); ++SCCI) {
20     const std::vector<BasicBlock *> &NextSCC = *SCCI;
21     OS << "\nSCC #" << ++SccNum << ": ";
22     bool First = true;
23     for (BasicBlock *BB : NextSCC) {
24       if (First)
25         First = false;
26       else
27         OS << ", ";
28       BB->printAsOperand(OS, false);
29     }
30     if (NextSCC.size() == 1 && SCCI.hasCycle())
31       OS << " (Has self-loop).";
32   }
33   OS << "\n";
34 
35   return PreservedAnalyses::all();
36 }
37