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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
42 lines
1.8 KiB
LLVM
42 lines
1.8 KiB
LLVM
; RUN: opt -analyze -module-debuginfo < %s | FileCheck %s
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; Produced from linking:
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; /tmp/test1.c containing f()
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; /tmp/test2.c containing g()
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; Verify that both compile units and both their contained functions are
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; listed by DebugInfoFinder:
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;CHECK: Compile unit: DW_LANG_C99 from /tmp/test1.c
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;CHECK: Compile unit: DW_LANG_C99 from /tmp/test2.c
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;CHECK: Subprogram: f from /tmp/test1.c:1
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;CHECK: Subprogram: g from /tmp/test2.c:1
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define void @f() !dbg !4 {
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ret void, !dbg !14
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}
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define void @g() !dbg !11 {
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ret void, !dbg !15
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}
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!llvm.dbg.cu = !{!0, !8}
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!llvm.module.flags = !{!13, !16}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (192092)", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test1.c", directory: "/tmp")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "f", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "test1.c", directory: "/tmp")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (192092)", isOptimized: false, emissionKind: 0, file: !9, enums: !2, retainedTypes: !2, subprograms: !10, globals: !2, imports: !2)
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!9 = !DIFile(filename: "test2.c", directory: "/tmp")
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!10 = !{!11}
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!11 = distinct !DISubprogram(name: "g", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 1, file: !9, scope: !12, type: !6, variables: !2)
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!12 = !DIFile(filename: "test2.c", directory: "/tmp")
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!13 = !{i32 2, !"Dwarf Version", i32 4}
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!14 = !DILocation(line: 1, scope: !4)
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!15 = !DILocation(line: 1, scope: !11)
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!16 = !{i32 1, !"Debug Info Version", i32 3}
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