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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
72 lines
2.9 KiB
LLVM
72 lines
2.9 KiB
LLVM
; A by-value struct is a register-indirect value (breg).
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; RUN: llc %s -filetype=asm -o - | FileCheck %s
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; CHECK: Lsection_info:
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; CHECK: DW_AT_location
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; CHECK-NEXT: .byte 112
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; 112 = 0x70 = DW_OP_breg0
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; rdar://problem/13658587
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;
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; Generated from
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;
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; struct five
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; {
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; int a;
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; int b;
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; int c;
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; int d;
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; int e;
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; };
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;
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; int
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; return_five_int (struct five f)
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; {
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; return f.a;
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; }
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-n32:64-S128"
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target triple = "arm64-apple-ios3.0.0"
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%struct.five = type { i32, i32, i32, i32, i32 }
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; Function Attrs: nounwind ssp
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define i32 @return_five_int(%struct.five* %f) #0 !dbg !4 {
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entry:
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call void @llvm.dbg.declare(metadata %struct.five* %f, metadata !17, metadata !DIExpression(DW_OP_deref)), !dbg !18
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%a = getelementptr inbounds %struct.five, %struct.five* %f, i32 0, i32 0, !dbg !19
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%0 = load i32, i32* %a, align 4, !dbg !19
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ret i32 %0, !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 ssp }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!16, !20}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "LLVM version 3.4 ", isOptimized: false, emissionKind: 0, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "struct_by_value.c", directory: "")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "return_five_int", line: 13, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 14, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "struct_by_value.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !9}
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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 = !DICompositeType(tag: DW_TAG_structure_type, name: "five", line: 1, size: 160, align: 32, file: !1, elements: !10)
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!10 = !{!11, !12, !13, !14, !15}
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "a", line: 3, size: 32, align: 32, file: !1, scope: !9, baseType: !8)
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!12 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 4, size: 32, align: 32, offset: 32, file: !1, scope: !9, baseType: !8)
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "c", line: 5, size: 32, align: 32, offset: 64, file: !1, scope: !9, baseType: !8)
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!14 = !DIDerivedType(tag: DW_TAG_member, name: "d", line: 6, size: 32, align: 32, offset: 96, file: !1, scope: !9, baseType: !8)
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!15 = !DIDerivedType(tag: DW_TAG_member, name: "e", line: 7, size: 32, align: 32, offset: 128, file: !1, scope: !9, baseType: !8)
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!16 = !{i32 2, !"Dwarf Version", i32 2}
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!17 = !DILocalVariable(name: "f", line: 13, arg: 1, scope: !4, file: !5, type: !9)
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!18 = !DILocation(line: 13, scope: !4)
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!19 = !DILocation(line: 16, scope: !4)
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!20 = !{i32 1, !"Debug Info Version", i32 3}
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