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5b721561aa
Previously, subprograms contained a metadata reference to the function they described. Because most clients need to get or set a subprogram for a given function rather than the other way around, this created unneeded inefficiency. For example, many passes needed to call the function llvm::makeSubprogramMap() to build a mapping from functions to subprograms, and the IR linker needed to fix up function references in a way that caused quadratic complexity in the IR linking phase of LTO. This change reverses the direction of the edge by storing the subprogram as function-level metadata and removing DISubprogram's function field. Since this is an IR change, a bitcode upgrade has been provided. Fixes PR23367. An upgrade script for textual IR for out-of-tree clients is attached to the PR. Differential Revision: http://reviews.llvm.org/D14265 llvm-svn: 252219
67 lines
3.0 KiB
LLVM
67 lines
3.0 KiB
LLVM
; REQUIRES: object-emission
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; RUN: %llc_dwarf -filetype=obj -O0 < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; generated by clang from:
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; struct foo {
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; void f1();
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; void f2();
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; };
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;
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; void foo::f1() {
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; }
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; CHECK: DW_TAG_structure_type
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; CHECK-NEXT: DW_AT_name {{.*}} "foo"
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; CHECK-NOT: NULL
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: NULL
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; CHECK: DW_AT_name {{.*}} "f1"
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: NULL
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; CHECK: DW_AT_name {{.*}} "f2"
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%struct.foo = type { i8 }
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; Function Attrs: nounwind uwtable
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define void @_ZN3foo2f1Ev(%struct.foo* %this) #0 align 2 !dbg !14 {
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entry:
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%this.addr = alloca %struct.foo*, align 8
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store %struct.foo* %this, %struct.foo** %this.addr, align 8
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call void @llvm.dbg.declare(metadata %struct.foo** %this.addr, metadata !16, metadata !DIExpression()), !dbg !18
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%this1 = load %struct.foo*, %struct.foo** %this.addr
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ret void, !dbg !19
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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 uwtable "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 = !{!15, !20}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !3, subprograms: !13, globals: !2, imports: !2)
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!1 = !DIFile(filename: "member-order.cpp", directory: "/tmp/dbginfo")
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!2 = !{}
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!3 = !{!4}
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!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "foo", line: 1, size: 8, align: 8, file: !1, elements: !5, identifier: "_ZTS3foo")
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!5 = !{!6, !11}
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!6 = !DISubprogram(name: "f1", linkageName: "_ZN3foo2f1Ev", line: 2, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 2, file: !1, scope: !4, type: !7)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9}
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !"_ZTS3foo")
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!10 = !{i32 786468}
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!11 = !DISubprogram(name: "f2", linkageName: "_ZN3foo2f2Ev", line: 3, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !4, type: !7)
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!12 = !{i32 786468}
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!13 = !{!14}
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!14 = distinct !DISubprogram(name: "f1", linkageName: "_ZN3foo2f1Ev", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 6, file: !1, scope: null, type: !7, declaration: !6, variables: !2)
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!15 = !{i32 2, !"Dwarf Version", i32 4}
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!16 = !DILocalVariable(name: "this", arg: 1, flags: DIFlagArtificial | DIFlagObjectPointer, scope: !14, type: !17)
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!17 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !"_ZTS3foo")
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!18 = !DILocation(line: 0, scope: !14)
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!19 = !DILocation(line: 7, scope: !14)
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!20 = !{i32 1, !"Debug Info Version", i32 3}
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