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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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This comes up in empty files or files containing #file directives that
never reference the actual source file name. Came up in a small test of
line tables I was playing with.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@201187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-02-11 21:49:46 +00:00
parent 3f93eb58a6
commit feb006fac4
2 changed files with 15 additions and 3 deletions
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3
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
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@ -751,9 +751,6 @@ 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,

15
test/DebugInfo/empty.ll Normal file
View File

@ -0,0 +1,15 @@
; RUN: llc %s -o %t -filetype=obj
; RUN: llvm-dwarfdump -debug-dump=line %t | FileCheck %s
; Expect no line table entry since there are no functions and file references in this compile unit
; CHECK: .debug_line contents:
; CHECK-NOT: Line table prologue:
!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}