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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
2.8 KiB
LLVM
67 lines
2.8 KiB
LLVM
; RUN: llc -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_const_value [DW_FORM_udata] (0)
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; CHECK-NEXT: DW_AT_name {{.*}}"a"
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;
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; ModuleID = 'union.c'
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; generated at -O1 from:
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; union mfi_evt {
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; struct {
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; int reserved;
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; } members;
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; } mfi_aen_setup() {
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; union mfi_evt a;
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; a.members.reserved = 0;
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; }
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.10.0"
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%union.mfi_evt = type { %struct.anon }
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%struct.anon = type { i32 }
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; Function Attrs: nounwind readnone ssp uwtable
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define i32 @mfi_aen_setup() #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.declare(metadata %union.mfi_evt* undef, metadata !16, metadata !21), !dbg !22
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !16, metadata !21), !dbg !22
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ret i32 undef, !dbg !23
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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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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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attributes #0 = { nounwind readnone ssp uwtable }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!17, !18, !19}
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!llvm.ident = !{!20}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.7.0 (trunk 226915) (llvm/trunk 226905)", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "union.c", directory: "")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "mfi_aen_setup", line: 5, isLocal: false, isDefinition: true, isOptimized: true, scopeLine: 5, file: !1, scope: !5, type: !6, variables: !15)
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!5 = !DIFile(filename: "union.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8}
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!8 = !DICompositeType(tag: DW_TAG_union_type, name: "mfi_evt", line: 1, size: 32, align: 32, file: !1, elements: !9)
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!9 = !{!10}
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!10 = !DIDerivedType(tag: DW_TAG_member, name: "members", line: 4, size: 32, align: 32, file: !1, scope: !8, baseType: !11)
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!11 = !DICompositeType(tag: DW_TAG_structure_type, line: 2, size: 32, align: 32, file: !1, scope: !8, elements: !12)
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "reserved", line: 3, size: 32, align: 32, file: !1, scope: !11, baseType: !14)
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!14 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!15 = !{!16}
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!16 = !DILocalVariable(name: "a", line: 6, scope: !4, file: !5, type: !8)
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!17 = !{i32 2, !"Dwarf Version", i32 2}
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!18 = !{i32 2, !"Debug Info Version", i32 3}
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!19 = !{i32 1, !"PIC Level", i32 2}
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!20 = !{!"clang version 3.7.0 (trunk 226915) (llvm/trunk 226905)"}
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!21 = !DIExpression()
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!22 = !DILocation(line: 6, column: 17, scope: !4)
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!23 = !DILocation(line: 8, column: 1, scope: !4)
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