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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
80 lines
3.6 KiB
LLVM
80 lines
3.6 KiB
LLVM
; RUN: llc < %s -mtriple=arm-linux-unknown-gnueabi -verify-machineinstrs -filetype=asm | FileCheck %s -check-prefix=ARM-linux
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; RUN: llc < %s -mtriple=arm-linux-unknown-gnueabi -filetype=obj
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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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define void @test_basic() #0 !dbg !4 {
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%mem = alloca i32, i32 10
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call void @dummy_use (i32* %mem, i32 10)
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ret void
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; ARM-linux: test_basic:
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; ARM-linux: push {r4, r5}
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; ARM-linux: .cfi_def_cfa_offset 8
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; ARM-linux: .cfi_offset r5, -4
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; ARM-linux: .cfi_offset r4, -8
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; ARM-linux-NEXT: mrc p15, #0, r4, c13, c0, #3
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; ARM-linux-NEXT: mov r5, sp
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; ARM-linux-NEXT: ldr r4, [r4, #4]
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; ARM-linux-NEXT: cmp r4, r5
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; ARM-linux-NEXT: blo .LBB0_2
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; ARM-linux: mov r4, #48
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; ARM-linux-NEXT: mov r5, #0
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; ARM-linux-NEXT: stmdb sp!, {lr}
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; ARM-linux: .cfi_def_cfa_offset 12
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; ARM-linux: .cfi_offset lr, -12
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; ARM-linux-NEXT: bl __morestack
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; ARM-linux-NEXT: ldm sp!, {lr}
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; ARM-linux-NEXT: pop {r4, r5}
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; ARM-linux: .cfi_def_cfa_offset 0
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; ARM-linux-NEXT: bx lr
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; ARM-linux: pop {r4, r5}
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; ARM-linux: .cfi_def_cfa_offset 0
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; ARM-linux .cfi_same_value r4
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; ARM-linux .cfi_same_value r5
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}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "var.c", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "test_basic", line: 5, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 5, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "var.c", directory: "/tmp")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !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 "}
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!12 = !DILocalVariable(name: "count", line: 5, arg: 1, scope: !4, file: !5, type: !8)
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!13 = !DILocation(line: 5, scope: !4)
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!14 = !DILocalVariable(name: "vl", line: 6, scope: !4, file: !5, type: !15)
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!15 = !DIDerivedType(tag: DW_TAG_typedef, name: "va_list", line: 30, file: !16, baseType: !17)
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!16 = !DIFile(filename: "/linux-x86_64-high/gcc_4.7.2/dbg/llvm/bin/../lib/clang/3.5/include/stdarg.h", directory: "/tmp")
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!17 = !DIDerivedType(tag: DW_TAG_typedef, name: "__builtin_va_list", line: 6, file: !1, baseType: !18)
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!18 = !DICompositeType(tag: DW_TAG_structure_type, name: "__va_list", line: 6, size: 32, align: 32, file: !1, elements: !19)
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!19 = !{!20}
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!20 = !DIDerivedType(tag: DW_TAG_member, name: "__ap", line: 6, size: 32, align: 32, file: !1, scope: !18, baseType: !21)
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!21 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 32, align: 32, baseType: null)
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!22 = !DILocation(line: 6, scope: !4)
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!23 = !DILocation(line: 7, scope: !4)
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!24 = !DILocalVariable(name: "test_basic", line: 8, scope: !4, file: !5, type: !8)
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!25 = !DILocation(line: 8, scope: !4)
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!26 = !DILocalVariable(name: "i", line: 9, scope: !27, file: !5, type: !8)
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!27 = distinct !DILexicalBlock(line: 9, column: 0, file: !1, scope: !4)
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!28 = !DILocation(line: 9, scope: !27)
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!29 = !DILocation(line: 10, scope: !30)
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!30 = distinct !DILexicalBlock(line: 9, column: 0, file: !1, scope: !27)
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!31 = !DILocation(line: 11, scope: !30)
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!32 = !DILocation(line: 12, scope: !4)
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!33 = !DILocation(line: 13, scope: !4)
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; Just to prevent the alloca from being optimized away
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declare void @dummy_use(i32*, i32)
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attributes #0 = { "split-stack" }
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