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fb3abba237
Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
122 lines
4.9 KiB
LLVM
122 lines
4.9 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin %s -o %t.o -filetype=obj -O0
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; RUN: llvm-dwarfdump %t.o | FileCheck %s
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;
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; Test that on x86_64, the 32-bit subregister esi is emitted as
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; DW_OP_piece 32 of the 64-bit rsi.
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;
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; rdar://problem/16015314
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;
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; CHECK: .debug_info contents:
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location [DW_FORM_data4] (0x00000000)
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; CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}} "a"
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; CHECK: .debug_loc contents:
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; rsi, piece 0x00000004
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; CHECK: Location description: 54 93 04
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;
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; struct bar {
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; int a;
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; int b;
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; };
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;
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; void doSomething() __attribute__ ((noinline));
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;
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; void doSomething(struct bar *b)
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; {
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; int a = b->a;
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; printf("%d\n", a); // set breakpoint here
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; }
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;
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; int main()
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; {
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; struct bar myBar = { 3, 4 };
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; doSomething(&myBar);
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; return 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-macosx10.9.0"
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%struct.bar = type { i32, i32 }
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@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
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@main.myBar = private unnamed_addr constant %struct.bar { i32 3, i32 4 }, align 4
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; Function Attrs: noinline nounwind ssp uwtable
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define void @doSomething(%struct.bar* nocapture readonly %b) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata %struct.bar* %b, i64 0, metadata !15, metadata !DIExpression()), !dbg !25
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%a1 = getelementptr inbounds %struct.bar, %struct.bar* %b, i64 0, i32 0, !dbg !26
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%0 = load i32, i32* %a1, align 4, !dbg !26, !tbaa !27
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tail call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !16, metadata !DIExpression()), !dbg !26
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%call = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %0) #4, !dbg !32
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ret void, !dbg !33
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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
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declare i32 @printf(i8* nocapture readonly, ...) #2
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; Function Attrs: nounwind ssp uwtable
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define i32 @main() #3 !dbg !17 {
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entry:
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%myBar = alloca i64, align 8, !dbg !34
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%tmpcast = bitcast i64* %myBar to %struct.bar*, !dbg !34
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tail call void @llvm.dbg.declare(metadata %struct.bar* %tmpcast, metadata !21, metadata !DIExpression()), !dbg !34
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store i64 17179869187, i64* %myBar, align 8, !dbg !34
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call void @doSomething(%struct.bar* %tmpcast), !dbg !35
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ret i32 0, !dbg !36
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}
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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 = { noinline nounwind ssp uwtable }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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attributes #3 = { nounwind ssp uwtable }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!22, !23}
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!llvm.ident = !{!24}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "subregisters.c", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "doSomething", line: 10, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 11, file: !1, scope: !5, type: !6, variables: !14)
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!5 = !DIFile(filename: "subregisters.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !9)
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!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "bar", line: 3, size: 64, align: 32, file: !1, elements: !10)
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!10 = !{!11, !13}
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "a", line: 4, size: 32, align: 32, file: !1, scope: !9, baseType: !12)
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!12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 5, size: 32, align: 32, offset: 32, file: !1, scope: !9, baseType: !12)
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!14 = !{!15, !16}
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!15 = !DILocalVariable(name: "b", line: 10, arg: 1, scope: !4, file: !5, type: !8)
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!16 = !DILocalVariable(name: "a", line: 12, scope: !4, file: !5, type: !12)
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!17 = distinct !DISubprogram(name: "main", line: 16, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !0, scopeLine: 17, file: !1, scope: !5, type: !18, variables: !20)
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!18 = !DISubroutineType(types: !19)
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!19 = !{!12}
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!20 = !{!21}
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!21 = !DILocalVariable(name: "myBar", line: 18, scope: !17, file: !5, type: !9)
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!22 = !{i32 2, !"Dwarf Version", i32 2}
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!23 = !{i32 1, !"Debug Info Version", i32 3}
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!24 = !{!"clang version 3.5 "}
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!25 = !DILocation(line: 10, scope: !4)
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!26 = !DILocation(line: 12, scope: !4)
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!27 = !{!28, !29, i64 0}
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!28 = !{!"bar", !29, i64 0, !29, i64 4}
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!29 = !{!"int", !30, i64 0}
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!30 = !{!"omnipotent char", !31, i64 0}
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!31 = !{!"Simple C/C++ TBAA"}
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!32 = !DILocation(line: 13, scope: !4)
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!33 = !DILocation(line: 14, scope: !4)
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!34 = !DILocation(line: 18, scope: !17)
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!35 = !DILocation(line: 19, scope: !17)
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!36 = !DILocation(line: 20, scope: !17)
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