llvm/lib/Analysis/CFGSCCPrinter.cpp

   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 }