polly/lib/Support/ScopLocation.cpp

   1 //=== ScopLocation.cpp - Debug location for ScopDetection ----- -*- C++ -*-===//
   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 // Helper function for extracting region debug information.
  10 //
  11 //===----------------------------------------------------------------------===//
  12 //
  13 #include "polly/Support/ScopLocation.h"
  14 #include "llvm/Analysis/RegionInfo.h"
  15 #include "llvm/IR/DebugInfoMetadata.h"
  16
  17 using namespace llvm;
  18
  19 namespace polly {
  20
  21 void getDebugLocation(const Region *R, unsigned &LineBegin, unsigned &LineEnd,
  22                       std::string &FileName) {
  23   LineBegin = -1;
  24   LineEnd = 0;
  25
  26   for (const BasicBlock *BB : R->blocks())
  27     for (const Instruction &Inst : *BB) {
  28       DebugLoc DL = Inst.getStableDebugLoc();
  29       if (!DL)
  30         continue;
  31
  32       auto *Scope = cast<DIScope>(DL.getScope());
  33
  34       if (FileName.empty())
  35         FileName = Scope->getFilename().str();
  36
  37       unsigned NewLine = DL.getLine();
  38
  39       LineBegin = std::min(LineBegin, NewLine);
  40       LineEnd = std::max(LineEnd, NewLine);
  41     }
  42 }
  43 } // namespace polly