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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
105 lines
4.8 KiB
LLVM
105 lines
4.8 KiB
LLVM
; RUN: llc -O0 %s -mtriple=x86_64-apple-darwin -filetype=obj -o %t
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; RUN: llvm-dwarfdump %t | FileCheck %s
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; RUN: llc -O0 %s -mtriple=x86_64-apple-darwin -filetype=obj -o %t -dwarf-version=3
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; RUN: llvm-dwarfdump %t | FileCheck %s -check-prefix=DWARF3
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; RUN: llc < %s -O0 -mtriple=x86_64-apple-macosx10.7 | FileCheck %s -check-prefix=ASM
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; rdar://13067005
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; CHECK: .debug_info contents:
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset] (0x00000000)
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; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
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; CHECK: DW_AT_high_pc [DW_FORM_data4] (0x00000010)
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
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; CHECK: DW_AT_high_pc [DW_FORM_data4] (0x00000010)
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset] (0x0000003c)
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; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000010)
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; CHECK: DW_AT_high_pc [DW_FORM_data4] (0x00000009)
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000010)
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; CHECK: DW_AT_high_pc [DW_FORM_data4] (0x00000009)
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; CHECK: .debug_line contents:
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; CHECK-NEXT: Line table prologue:
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; CHECK-NEXT: total_length: 0x00000038
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; CHECK: file_names[ 1] 0 0x00000000 0x00000000 simple.c
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; CHECK: Line table prologue:
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; CHECK-NEXT: total_length: 0x00000039
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; CHECK: file_names[ 1] 0 0x00000000 0x00000000 simple2.c
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; CHECK-NOT: file_names
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; DWARF3: .debug_info contents:
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; DWARF3: DW_TAG_compile_unit
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; DWARF3: DW_AT_stmt_list [DW_FORM_data4] (0x00000000)
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; DWARF3: DW_TAG_compile_unit
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; DWARF3: DW_AT_stmt_list [DW_FORM_data4] (0x0000003c)
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; DWARF3: .debug_line contents:
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; DWARF3-NEXT: Line table prologue:
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; DWARF3-NEXT: total_length: 0x00000038
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; DWARF3: file_names[ 1] 0 0x00000000 0x00000000 simple.c
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; DWARF3: Line table prologue:
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; DWARF3-NEXT: total_length: 0x00000039
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; DWARF3: file_names[ 1] 0 0x00000000 0x00000000 simple2.c
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; DWARF3-NOT: file_names
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; PR15408
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; ASM: Lcu_begin0:
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; ASM-NOT: Lcu_begin
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; ASM: Lset[[LT:[0-9]+]] = Lline_table_start0-Lsection_line ## DW_AT_stmt_list
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; ASM-NEXT: .long Lset[[LT]]
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; ASM: Lcu_begin1:
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; ASM-NOT: Lcu_begin
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; ASM: Lset[[LT:[0-9]+]] = Lline_table_start0-Lsection_line ## DW_AT_stmt_list
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; ASM-NEXT: .long Lset[[LT]]
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define i32 @test(i32 %a) nounwind uwtable ssp !dbg !5 {
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entry:
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%a.addr = alloca i32, align 4
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store i32 %a, i32* %a.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %a.addr, metadata !15, metadata !DIExpression()), !dbg !16
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%0 = load i32, i32* %a.addr, align 4, !dbg !17
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%call = call i32 @fn(i32 %0), !dbg !17
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ret i32 %call, !dbg !17
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}
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declare void @llvm.dbg.declare(metadata, metadata, metadata) nounwind readnone
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define i32 @fn(i32 %a) nounwind uwtable ssp !dbg !13 {
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entry:
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%a.addr = alloca i32, align 4
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store i32 %a, i32* %a.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %a.addr, metadata !19, metadata !DIExpression()), !dbg !20
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%0 = load i32, i32* %a.addr, align 4, !dbg !21
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ret i32 %0, !dbg !21
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}
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!llvm.dbg.cu = !{!0, !10}
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!llvm.module.flags = !{!25}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3", isOptimized: false, emissionKind: FullDebug, file: !23, enums: !1, retainedTypes: !1, globals: !1, imports: !1)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "test", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 3, file: !23, scope: !6, type: !7, variables: !1)
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!6 = !DIFile(filename: "simple.c", directory: "/private/tmp")
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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 !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.3 (trunk 172862)", isOptimized: false, emissionKind: FullDebug, file: !24, enums: !1, retainedTypes: !1, globals: !1, imports: !1)
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!13 = distinct !DISubprogram(name: "fn", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !10, scopeLine: 1, file: !24, scope: !14, type: !7, variables: !1)
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!14 = !DIFile(filename: "simple2.c", directory: "/private/tmp")
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!15 = !DILocalVariable(name: "a", line: 2, arg: 1, scope: !5, file: !6, type: !9)
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!16 = !DILocation(line: 2, scope: !5)
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!17 = !DILocation(line: 4, scope: !18)
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!18 = distinct !DILexicalBlock(line: 3, column: 0, file: !23, scope: !5)
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!19 = !DILocalVariable(name: "a", line: 1, arg: 1, scope: !13, file: !14, type: !9)
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!20 = !DILocation(line: 1, scope: !13)
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!21 = !DILocation(line: 2, scope: !22)
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!22 = distinct !DILexicalBlock(line: 1, column: 0, file: !24, scope: !13)
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!23 = !DIFile(filename: "simple.c", directory: "/private/tmp")
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!24 = !DIFile(filename: "simple2.c", directory: "/private/tmp")
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!25 = !{i32 1, !"Debug Info Version", i32 3}
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