1 files changed, 36 insertions, 0 deletions

diff --git a/contrib/llvm-project/llvm/lib/Analysis/CFGSCCPrinter.cpp b/contrib/llvm-project/llvm/lib/Analysis/CFGSCCPrinter.cpp
new file mode 100644
index 000000000000..24495eba10da
--- /dev/null
+++ b/contrib/llvm-project/llvm/lib/Analysis/CFGSCCPrinter.cpp
@@ -0,0 +1,36 @@
+//===- CFGSCCPrinter.cpp --------------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Analysis/CFGSCCPrinter.h"
+#include "llvm/ADT/SCCIterator.h"
+#include "llvm/IR/CFG.h"
+
+using namespace llvm;
+
+PreservedAnalyses CFGSCCPrinterPass::run(Function &F,
+                                         FunctionAnalysisManager &AM) {
+  unsigned SccNum = 0;
+  OS << "SCCs for Function " << F.getName() << " in PostOrder:";
+  for (scc_iterator<Function *> SCCI = scc_begin(&F); !SCCI.isAtEnd(); ++SCCI) {
+    const std::vector<BasicBlock *> &NextSCC = *SCCI;
+    OS << "\nSCC #" << ++SccNum << ": ";
+    bool First = true;
+    for (BasicBlock *BB : NextSCC) {
+      if (First)
+        First = false;
+      else
+        OS << ", ";
+      BB->printAsOperand(OS, false);
+    }
+    if (NextSCC.size() == 1 && SCCI.hasCycle())
+      OS << " (Has self-loop).";
+  }
+  OS << "\n";
+
+  return PreservedAnalyses::all();
+}