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| author | Adrian Prantl <aprantl@apple.com> | 2016-04-15 15:57:41 +0000 |
|---|---|---|
| committer | Adrian Prantl <aprantl@apple.com> | 2016-04-15 15:57:41 +0000 |
| commit | 75819aedf6d774a424e35793b266442708e57050 (patch) | |
| tree | e4eabf3bd19e9dee6ed3aefc8f4e2cb16d6bb285 /llvm/test/CodeGen/XCore | |
| parent | e76bda544bbf52d9ff3b55e6018b494a1e6bbc00 (diff) | |
| download | bcm5719-llvm-75819aedf6d774a424e35793b266442708e57050.tar.gz bcm5719-llvm-75819aedf6d774a424e35793b266442708e57050.zip | |
[PR27284] Reverse the ownership between DICompileUnit and DISubprogram.
Currently each Function points to a DISubprogram and DISubprogram has a
scope field. For member functions the scope is a DICompositeType. DIScopes
point to the DICompileUnit to facilitate type uniquing.
Distinct DISubprograms (with isDefinition: true) are not part of the type
hierarchy and cannot be uniqued. This change removes the subprograms
list from DICompileUnit and instead adds a pointer to the owning compile
unit to distinct DISubprograms. This would make it easy for ThinLTO to
strip unneeded DISubprograms and their transitively referenced debug info.
Motivation
----------
Materializing DISubprograms is currently the most expensive operation when
doing a ThinLTO build of clang.
We want the DISubprogram to be stored in a separate Bitcode block (or the
same block as the function body) so we can avoid having to expensively
deserialize all DISubprograms together with the global metadata. If a
function has been inlined into another subprogram we need to store a
reference the block containing the inlined subprogram.
Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script
that updates LLVM IR testcases to the new format.
http://reviews.llvm.org/D19034
<rdar://problem/25256815>
llvm-svn: 266446
Diffstat (limited to 'llvm/test/CodeGen/XCore')
| -rw-r--r-- | llvm/test/CodeGen/XCore/dwarf_debug.ll | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/llvm/test/CodeGen/XCore/dwarf_debug.ll b/llvm/test/CodeGen/XCore/dwarf_debug.ll index 68a03947baa..d9b2f24d997 100644 --- a/llvm/test/CodeGen/XCore/dwarf_debug.ll +++ b/llvm/test/CodeGen/XCore/dwarf_debug.ll @@ -23,11 +23,10 @@ declare void @llvm.dbg.declare(metadata, metadata, metadata) !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!9, !10} -!0 = distinct !DICompileUnit(language: DW_LANG_C99, isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2) +!0 = distinct !DICompileUnit(language: DW_LANG_C99, isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2) !1 = !DIFile(filename: "test.c", directory: "") !2 = !{} -!3 = !{!4} -!4 = distinct !DISubprogram(name: "f", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !1, scope: !1, type: !6, variables: !2) +!4 = distinct !DISubprogram(name: "f", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 2, file: !1, scope: !1, type: !6, variables: !2) !6 = !DISubroutineType(types: !7) !7 = !{!8, !8} !8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) |
