; RUN: llc -mtriple=x86_64-apple-darwin %s -o %t.o -filetype=obj -O0 ; RUN: llvm-dwarfdump %t.o | FileCheck %s ; ; Test that on x86_64, the 32-bit subregister esi is emitted as ; DW_OP_piece 32 of the 64-bit rsi. ; ; rdar://problem/16015314 ; ; CHECK: .debug_info contents: ; CHECK: DW_TAG_variable ; CHECK-NEXT: DW_AT_location [DW_FORM_data4] (0x00000000) ; CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}} "a" ; CHECK: .debug_loc contents: ; rsi, piece 0x00000004 ; CHECK: Location description: 54 93 04 ; ; struct bar { ; int a; ; int b; ; }; ; ; void doSomething() __attribute__ ((noinline)); ; ; void doSomething(struct bar *b) ; { ; int a = b->a; ; printf("%d\n", a); // set breakpoint here ; } ; ; int main() ; { ; struct bar myBar = { 3, 4 }; ; doSomething(&myBar); ; return 0; ; } target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" target triple = "x86_64-apple-macosx10.9.0" %struct.bar = type { i32, i32 } @.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1 @main.myBar = private unnamed_addr constant %struct.bar { i32 3, i32 4 }, align 4 ; Function Attrs: noinline nounwind ssp uwtable define void @doSomething(%struct.bar* nocapture readonly %b) #0 !dbg !4 { entry: tail call void @llvm.dbg.value(metadata %struct.bar* %b, i64 0, metadata !15, metadata !DIExpression()), !dbg !25 %a1 = getelementptr inbounds %struct.bar, %struct.bar* %b, i64 0, i32 0, !dbg !26 %0 = load i32, i32* %a1, align 4, !dbg !26, !tbaa !27 tail call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !16, metadata !DIExpression()), !dbg !26 %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 ret void, !dbg !33 } ; Function Attrs: nounwind readnone declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 ; Function Attrs: nounwind declare i32 @printf(i8* nocapture readonly, ...) #2 ; Function Attrs: nounwind ssp uwtable define i32 @main() #3 !dbg !17 { entry: %myBar = alloca i64, align 8, !dbg !34 %tmpcast = bitcast i64* %myBar to %struct.bar*, !dbg !34 tail call void @llvm.dbg.declare(metadata %struct.bar* %tmpcast, metadata !21, metadata !DIExpression()), !dbg !34 store i64 17179869187, i64* %myBar, align 8, !dbg !34 call void @doSomething(%struct.bar* %tmpcast), !dbg !35 ret i32 0, !dbg !36 } ; Function Attrs: nounwind readnone declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1 attributes #0 = { noinline nounwind ssp uwtable } attributes #1 = { nounwind readnone } attributes #2 = { nounwind } attributes #3 = { nounwind ssp uwtable } attributes #4 = { nounwind } !llvm.dbg.cu = !{!0} !llvm.module.flags = !{!22, !23} !llvm.ident = !{!24} !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) !1 = !DIFile(filename: "subregisters.c", directory: "") !2 = !{} !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) !5 = !DIFile(filename: "subregisters.c", directory: "") !6 = !DISubroutineType(types: !7) !7 = !{null, !8} !8 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !9) !9 = !DICompositeType(tag: DW_TAG_structure_type, name: "bar", line: 3, size: 64, align: 32, file: !1, elements: !10) !10 = !{!11, !13} !11 = !DIDerivedType(tag: DW_TAG_member, name: "a", line: 4, size: 32, align: 32, file: !1, scope: !9, baseType: !12) !12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) !13 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 5, size: 32, align: 32, offset: 32, file: !1, scope: !9, baseType: !12) !14 = !{!15, !16} !15 = !DILocalVariable(name: "b", line: 10, arg: 1, scope: !4, file: !5, type: !8) !16 = !DILocalVariable(name: "a", line: 12, scope: !4, file: !5, type: !12) !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) !18 = !DISubroutineType(types: !19) !19 = !{!12} !20 = !{!21} !21 = !DILocalVariable(name: "myBar", line: 18, scope: !17, file: !5, type: !9) !22 = !{i32 2, !"Dwarf Version", i32 2} !23 = !{i32 1, !"Debug Info Version", i32 3} !24 = !{!"clang version 3.5 "} !25 = !DILocation(line: 10, scope: !4) !26 = !DILocation(line: 12, scope: !4) !27 = !{!28, !29, i64 0} !28 = !{!"bar", !29, i64 0, !29, i64 4} !29 = !{!"int", !30, i64 0} !30 = !{!"omnipotent char", !31, i64 0} !31 = !{!"Simple C/C++ TBAA"} !32 = !DILocation(line: 13, scope: !4) !33 = !DILocation(line: 14, scope: !4) !34 = !DILocation(line: 18, scope: !17) !35 = !DILocation(line: 19, scope: !17) !36 = !DILocation(line: 20, scope: !17)