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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
38 lines
1.7 KiB
LLVM
38 lines
1.7 KiB
LLVM
; RUN: %llc_dwarf -asm-verbose -O1 -o %t < %s
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; RUN: grep DW_AT_APPLE_omit_frame_ptr %t
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; RUN: %llc_dwarf -disable-fp-elim -asm-verbose -O1 -o %t < %s
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; RUN: grep -v DW_AT_APPLE_omit_frame_ptr %t
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define i32 @foo() nounwind ssp !dbg !1 {
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entry:
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%retval = alloca i32 ; <i32*> [#uses=2]
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%0 = alloca i32 ; <i32*> [#uses=2]
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%"alloca point" = bitcast i32 0 to i32 ; <i32> [#uses=0]
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store i32 42, i32* %0, align 4, !dbg !0
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%1 = load i32, i32* %0, align 4, !dbg !0 ; <i32> [#uses=1]
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store i32 %1, i32* %retval, align 4, !dbg !0
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br label %return, !dbg !0
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return: ; preds = %entry
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%retval1 = load i32, i32* %retval, !dbg !0 ; <i32> [#uses=1]
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ret i32 %retval1, !dbg !7
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}
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!llvm.dbg.cu = !{!3}
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!llvm.module.flags = !{!12}
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!9 = !{!1}
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!0 = !DILocation(line: 2, scope: !1)
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!1 = distinct !DISubprogram(name: "foo", linkageName: "foo", line: 2, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, scopeLine: 2, file: !10, scope: null, type: !4)
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!2 = !DIFile(filename: "a.c", directory: "/tmp")
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!3 = distinct !DICompileUnit(language: DW_LANG_C89, producer: "4.2.1 (Based on Apple Inc. build 5658) (LLVM build)", isOptimized: false, emissionKind: 0, file: !10, enums: !11, retainedTypes: !11, subprograms: !9, imports: null)
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!4 = !DISubroutineType(types: !5)
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!5 = !{!6}
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!6 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !DILocation(line: 2, scope: !8)
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!8 = distinct !DILexicalBlock(line: 2, column: 0, file: !10, scope: !1)
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!10 = !DIFile(filename: "a.c", directory: "/tmp")
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!11 = !{}
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!12 = !{i32 1, !"Debug Info Version", i32 3}
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