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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
36 lines
1.7 KiB
LLVM
36 lines
1.7 KiB
LLVM
; RUN: llc %s -O0 -o /dev/null -mtriple=x86_64-apple-darwin
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; PR 5197
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; There is not any llvm instruction assocated with !5. The code generator
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; should be able to handle this.
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define void @bar() nounwind ssp {
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entry:
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%count_ = alloca i32, align 4 ; <i32*> [#uses=2]
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br label %do.body, !dbg !0
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do.body: ; preds = %entry
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call void @llvm.dbg.declare(metadata i32* %count_, metadata !4, metadata !DIExpression()), !dbg !DILocation(scope: !5)
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%conv = ptrtoint i32* %count_ to i32, !dbg !0 ; <i32> [#uses=1]
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%call = call i32 @foo(i32 %conv) ssp, !dbg !0 ; <i32> [#uses=0]
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br label %do.end, !dbg !0
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do.end: ; preds = %do.body
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ret void, !dbg !7
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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declare i32 @foo(i32) ssp
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!llvm.dbg.cu = !{!3}
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!0 = !DILocation(line: 5, column: 2, scope: !1)
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!1 = distinct !DILexicalBlock(line: 1, column: 1, file: null, scope: !2)
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!2 = distinct !DISubprogram(name: "bar", linkageName: "bar", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !3, scope: !3)
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!3 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang 1.1", isOptimized: true, emissionKind: FullDebug, file: !8, retainedTypes: !9)
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!4 = !DILocalVariable(name: "count_", line: 5, scope: !5, file: !3, type: !6)
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!5 = distinct !DILexicalBlock(line: 1, column: 1, file: null, scope: !1)
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !DILocation(line: 6, column: 1, scope: !2)
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!8 = !DIFile(filename: "genmodes.i", directory: "/Users/yash/Downloads")
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!9 = !{i32 0}
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