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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
53 lines
1.7 KiB
LLVM
53 lines
1.7 KiB
LLVM
; RUN: llc < %s -mtriple=i686-pc-linux | FileCheck %s
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; Function Attrs: optsize
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declare void @foo(i32, i32) #0
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declare x86_stdcallcc void @stdfoo(i32, i32) #0
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; CHECK-LABEL: test1:
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; CHECK: subl $8, %esp
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; CHECK: .cfi_adjust_cfa_offset 8
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; CHECK: pushl $2
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; CHECK: .cfi_adjust_cfa_offset 4
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; CHECK: pushl $1
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; CHECK: .cfi_adjust_cfa_offset 4
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; CHECK: calll foo
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; CHECK: addl $16, %esp
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; CHECK: .cfi_adjust_cfa_offset -16
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; CHECK: subl $8, %esp
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; CHECK: .cfi_adjust_cfa_offset 8
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; CHECK: pushl $4
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; CHECK: .cfi_adjust_cfa_offset 4
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; CHECK: pushl $3
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; CHECK: .cfi_adjust_cfa_offset 4
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; CHECK: calll stdfoo
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; CHECK: .cfi_adjust_cfa_offset -8
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; CHECK: addl $20, %esp
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; CHECK: .cfi_adjust_cfa_offset -8
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define void @test1() #0 !dbg !4 {
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entry:
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tail call void @foo(i32 1, i32 2) #1, !dbg !10
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tail call x86_stdcallcc void @stdfoo(i32 3, i32 4) #1, !dbg !11
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ret void, !dbg !12
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}
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attributes #0 = { nounwind optsize }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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!llvm.ident = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 250289)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "foo.c", directory: "foo")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "test1", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{!"clang version 3.8.0 (trunk 250289)"}
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!10 = !DILocation(line: 4, column: 3, scope: !4)
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!11 = !DILocation(line: 5, column: 3, scope: !4)
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!12 = !DILocation(line: 6, column: 1, scope: !4)
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