lib/CodeGen/AsmPrinter/DebugLocStream.cpp

   1 //===- DebugLocStream.cpp - DWARF debug_loc stream --------------*- 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 #include "DebugLocStream.h"
  10 #include "DwarfDebug.h"
  11 #include "llvm/CodeGen/AsmPrinter.h"
  12
  13 using namespace llvm;
  14
  15 bool DebugLocStream::finalizeList(AsmPrinter &Asm) {
  16   if (Lists.back().EntryOffset == Entries.size()) {
  17     // Empty list.  Delete it.
  18     Lists.pop_back();
  19     return false;
  20   }
  21
  22   // Real list.  Generate a label for it.
  23   Lists.back().Label = Asm.createTempSymbol("debug_loc");
  24   return true;
  25 }
  26
  27 void DebugLocStream::finalizeEntry() {
  28   if (Entries.back().ByteOffset != DWARFBytes.size())
  29     return;
  30
  31   // The last entry was empty.  Delete it.
  32   Comments.erase(Comments.begin() + Entries.back().CommentOffset,
  33                  Comments.end());
  34   Entries.pop_back();
  35
  36   assert(Lists.back().EntryOffset <= Entries.size() &&
  37          "Popped off more entries than are in the list");
  38 }
  39
  40 DebugLocStream::ListBuilder::~ListBuilder() {
  41   if (!Locs.finalizeList(Asm))
  42     return;
  43   V.initializeDbgValue(&MI);
  44   V.setDebugLocListIndex(ListIndex);
  45 }