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DebugInfo: Don't include the name of the CU file in the line table file list when it's unneeded

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Recommitting r201351 and r201355 (reverted in r201351 and r201355)

We weren't emitting the an empty (header only) line table when the line
table was empty - this made the DWARF invalid (the compile unit would
point to the zero-size debug_lines section where there should've been an
empty line table but there was nothing at all). Fix that, and as a
consequence this works around/addresses PR18809.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201380 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-02-14 01:57:59 +00:00
parent 5483012b4d
commit 35d2f61510
4 changed files with 30 additions and 4 deletions
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3
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -756,9 +756,6 @@ DwarfCompileUnit *DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
InfoHolder.addUnit(NewCU);
FileIDCUMap[NewCU->getUniqueID()] = 0;
// Call this to emit a .file directive if it wasn't emitted for the source
// file this CU comes from yet.
getOrCreateSourceID(FN, CompilationDir, NewCU->getUniqueID());
NewCU->addString(Die, dwarf::DW_AT_producer, DIUnit.getProducer());
NewCU->addUInt(Die, dwarf::DW_AT_language, dwarf::DW_FORM_data2,

3
lib/MC/MCObjectStreamer.cpp
View File

@ -379,7 +379,8 @@ void MCObjectStreamer::EmitZeros(uint64_t NumBytes) {
void MCObjectStreamer::FinishImpl() {
// Dump out the dwarf file & directory tables and line tables.
const MCSymbol *LineSectionSymbol = NULL;
if (getContext().hasDwarfFiles())
if (!getContext().getMCLineTableSymbols().empty() ||
getContext().hasDwarfFiles())
LineSectionSymbol = MCDwarfFileTable::Emit(this);
// If we are generating dwarf for assembly source files dump out the sections.

8
test/DebugInfo/X86/generate-odr-hash.ll
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@ -125,6 +125,14 @@
; CHECK: DW_TAG_member
; CHECK-NEXT: DW_AT_name{{.*}}"a"
; CHECK-LABEL: .debug_line contents:
; CHECK: Line table prologue
; CHECK-NOT: file_names[
; CHECK: file_names{{.*}} bar.h
; CHECK: file_names{{.*}} bar.cpp
; CHECK-NOT: file_names[
; CHECK-LABEL: .debug_str contents:
; Use the unit size as a rough hash/identifier for the unit we're dealing with
; it happens to be unambiguous at the moment, but it's hardly ideal.
; CHECK-LABEL: .debug_pubtypes contents:

20
test/DebugInfo/empty.ll Normal file
View File

@ -0,0 +1,20 @@
; RUN: llc %s -o %t -filetype=obj
; RUN: llvm-dwarfdump -debug-dump=line %t | FileCheck %s
; PR18809
; XFAIL: cygwin,mingw32
; Expect no line table entry since there are no functions and file references in this compile unit
; CHECK: .debug_line contents:
; CHECK: Line table prologue:
; CHECK: total_length: 0x00000019
; CHECK-NOT: file_names[
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!5}
!0 = metadata !{i32 720913, metadata !4, i32 12, metadata !"clang version 3.1 (trunk 143523)", i1 true, metadata !"", i32 0, metadata !2, metadata !2, metadata !2, metadata !2, null, metadata !""} ; [ DW_TAG_compile_unit ]
!2 = metadata !{}
!3 = metadata !{i32 786473, metadata !4} ; [ DW_TAG_file_type ]
!4 = metadata !{metadata !"empty.c", metadata !"/home/nlewycky"}
!5 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}