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fb3abba237
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
60 lines
2.6 KiB
LLVM
60 lines
2.6 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin -filetype=obj -O0 < %s > %t
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; RUN: llvm-dwarfdump %t | FileCheck %s
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; CHECK: [[FILEID:[0-9]+]]]{{.*}}list0.h
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; CHECK: [[FILEID]] 0 1 0 0 is_stmt{{$}}
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; IR generated from clang -g -emit-llvm with the following source:
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; list0.h:
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; int foo (int x) {
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; return ++x;
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; }
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; list0.c:
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; #include "list0.h"
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; int main() {
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; }
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define i32 @foo(i32 %x) #0 !dbg !4 {
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entry:
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%x.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %x.addr, metadata !14, metadata !DIExpression()), !dbg !15
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%0 = load i32, i32* %x.addr, align 4, !dbg !16
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%inc = add nsw i32 %0, 1, !dbg !16
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store i32 %inc, i32* %x.addr, align 4, !dbg !16
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ret i32 %inc, !dbg !16
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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define i32 @main() #0 !dbg !10 {
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entry:
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ret i32 0, !dbg !17
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}
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "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 = !{!19}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "list0.c", directory: "/usr/local/google/home/blaikie/dev/scratch")
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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: !5, scope: !6, type: !7, variables: !2)
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!5 = !DIFile(filename: "./list0.h", directory: "/usr/local/google/home/blaikie/dev/scratch")
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!6 = !DIFile(filename: "./list0.h", directory: "/usr/local/google/home/blaikie/dev/scratch")
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!7 = !DISubroutineType(types: !8)
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!8 = !{!9, !9}
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = distinct !DISubprogram(name: "main", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !0, scopeLine: 2, file: !1, scope: !11, type: !12, variables: !2)
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!11 = !DIFile(filename: "list0.c", directory: "/usr/local/google/home/blaikie/dev/scratch")
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!12 = !DISubroutineType(types: !13)
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!13 = !{!9}
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!14 = !DILocalVariable(name: "x", line: 1, arg: 1, scope: !4, file: !6, type: !9)
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!15 = !DILocation(line: 1, scope: !4)
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!16 = !DILocation(line: 2, scope: !4)
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!17 = !DILocation(line: 3, scope: !18)
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!18 = !DILexicalBlockFile(discriminator: 0, file: !11, scope: !10)
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!19 = !{i32 1, !"Debug Info Version", i32 3}
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