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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
65 lines
2.6 KiB
LLVM
65 lines
2.6 KiB
LLVM
; REQUIRES: object-emission
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; PR 19261
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; RUN: %llc_dwarf -fast-isel=false -O0 -filetype=obj %s -o %t
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; RUN: llvm-dwarfdump %t | FileCheck %s
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; CHECK: {{0x[0-9a-f]+}} 1 0 1 0 0 is_stmt
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; CHECK: {{0x[0-9a-f]+}} 2 0 1 0 0 is_stmt
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; CHECK: {{0x[0-9a-f]+}} 4 0 1 0 0 is_stmt
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; IR generated from clang -O0 -g with the following source:
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;void foo(int i){
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; switch(i){
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; default:
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; break;
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; }
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; return;
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;}
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; Function Attrs: nounwind
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define void @foo(i32 %i) #0 !dbg !4 {
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entry:
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%i.addr = alloca i32, align 4
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store i32 %i, i32* %i.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %i.addr, metadata !12, metadata !DIExpression()), !dbg !13
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%0 = load i32, i32* %i.addr, align 4, !dbg !14
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switch i32 %0, label %sw.default [
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], !dbg !14
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sw.epilog: ; preds = %sw.default
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ret void, !dbg !17
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sw.default: ; preds = %entry
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br label %sw.epilog, !dbg !15
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 (204712)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test.c", directory: "D:\5Cwork\5CEPRs\5C396363")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "test.c", directory: "D:CworkCEPRsC396363")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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!11 = !{!"clang version 3.5.0 (204712)"}
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!12 = !DILocalVariable(name: "i", line: 1, arg: 1, scope: !4, file: !5, type: !8)
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!13 = !DILocation(line: 1, scope: !4)
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!14 = !DILocation(line: 2, scope: !4)
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!15 = !DILocation(line: 4, scope: !16)
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!16 = distinct !DILexicalBlock(line: 2, column: 0, file: !1, scope: !4)
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!17 = !DILocation(line: 6, scope: !4)
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