llvm-mirror/lib/CodeGen/AsmPrinter/DebugLocStream.cpp
Duncan P. N. Exon Smith e09a8eebf6 AsmPrinter: Don't emit empty .debug_loc entries
If we don't know how to represent a .debug_loc entry, skip the entry
entirely rather than emitting an empty one.  Similarly, if a .debug_loc
list has no entries, don't create the list.

We still want to create the variables, just in an optimized-out form
that doesn't have a DW_AT_location.

llvm-svn: 240244
2015-06-21 16:54:56 +00:00

47 lines
1.3 KiB
C++

//===- DebugLocStream.cpp - DWARF debug_loc stream --------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DebugLocStream.h"
#include "DwarfDebug.h"
#include "llvm/CodeGen/AsmPrinter.h"
using namespace llvm;
bool DebugLocStream::finalizeList(AsmPrinter &Asm) {
if (Lists.back().EntryOffset == Entries.size()) {
// Empty list. Delete it.
Lists.pop_back();
return false;
}
// Real list. Generate a label for it.
Lists.back().Label = Asm.createTempSymbol("debug_loc");
return true;
}
void DebugLocStream::finalizeEntry() {
if (Entries.back().ByteOffset != DWARFBytes.size())
return;
// The last entry was empty. Delete it.
Comments.erase(Comments.begin() + Entries.back().CommentOffset,
Comments.end());
Entries.pop_back();
assert(Lists.back().EntryOffset <= Entries.size() &&
"Popped off more entries than are in the list");
}
DebugLocStream::ListBuilder::~ListBuilder() {
if (!Locs.finalizeList(Asm))
return;
V.initializeDbgValue(&MI);
V.setDebugLocListIndex(ListIndex);
}