1 ; RUN: llc -mtriple=x86_64-apple-darwin %s -o %t.o -filetype=obj -O0 2 ; RUN: llvm-dwarfdump %t.o | FileCheck %s 3 ; 4 ; Test that on x86_64, the 32-bit subregister esi is emitted as 5 ; DW_OP_piece 32 of the 64-bit rsi. 6 ; 7 ; rdar://problem/16015314 8 ; 9 ; CHECK: DW_AT_location [DW_FORM_block1] (<0x03> 54 93 04 ) 10 ; CHECK: DW_AT_name [DW_FORM_strp]{{.*}} "a" 11 ; 12 ; struct bar { 13 ; int a; 14 ; int b; 15 ; }; 16 ; 17 ; void doSomething() __attribute__ ((noinline)); 18 ; 19 ; void doSomething(struct bar *b) 20 ; { 21 ; int a = b->a; 22 ; printf("%d\n", a); // set breakpoint here 23 ; } 24 ; 25 ; int main() 26 ; { 27 ; struct bar myBar = { 3, 4 }; 28 ; doSomething(&myBar); 29 ; return 0; 30 ; } 31 32 target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128" 33 target triple = "x86_64-apple-macosx10.9.0" 34 35 %struct.bar = type { i32, i32 } 36 37 @.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1 38 @main.myBar = private unnamed_addr constant %struct.bar { i32 3, i32 4 }, align 4 39 40 ; Function Attrs: noinline nounwind ssp uwtable 41 define void @doSomething(%struct.bar* nocapture readonly %b) #0 { 42 entry: 43 tail call void @llvm.dbg.value(metadata %struct.bar* %b, i64 0, metadata !15, metadata !MDExpression()), !dbg !25 44 %a1 = getelementptr inbounds %struct.bar, %struct.bar* %b, i64 0, i32 0, !dbg !26 45 %0 = load i32, i32* %a1, align 4, !dbg !26, !tbaa !27 46 tail call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !16, metadata !MDExpression()), !dbg !26 47 %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 48 ret void, !dbg !33 49 } 50 51 ; Function Attrs: nounwind readnone 52 declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 53 54 ; Function Attrs: nounwind 55 declare i32 @printf(i8* nocapture readonly, ...) #2 56 57 ; Function Attrs: nounwind ssp uwtable 58 define i32 @main() #3 { 59 entry: 60 %myBar = alloca i64, align 8, !dbg !34 61 %tmpcast = bitcast i64* %myBar to %struct.bar*, !dbg !34 62 tail call void @llvm.dbg.declare(metadata %struct.bar* %tmpcast, metadata !21, metadata !MDExpression()), !dbg !34 63 store i64 17179869187, i64* %myBar, align 8, !dbg !34 64 call void @doSomething(%struct.bar* %tmpcast), !dbg !35 65 ret i32 0, !dbg !36 66 } 67 68 ; Function Attrs: nounwind readnone 69 declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1 70 71 attributes #0 = { noinline nounwind ssp uwtable } 72 attributes #1 = { nounwind readnone } 73 attributes #2 = { nounwind } 74 attributes #3 = { nounwind ssp uwtable } 75 attributes #4 = { nounwind } 76 77 !llvm.dbg.cu = !{!0} 78 !llvm.module.flags = !{!22, !23} 79 !llvm.ident = !{!24} 80 81 !0 = !MDCompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: true, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2) 82 !1 = !MDFile(filename: "subregisters.c", directory: "") 83 !2 = !{} 84 !3 = !{!4, !17} 85 !4 = !MDSubprogram(name: "doSomething", line: 10, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, scopeLine: 11, file: !1, scope: !5, type: !6, function: void (%struct.bar*)* @doSomething, variables: !14) 86 !5 = !MDFile(filename: "subregisters.c", directory: "") 87 !6 = !MDSubroutineType(types: !7) 88 !7 = !{null, !8} 89 !8 = !MDDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !9) 90 !9 = !MDCompositeType(tag: DW_TAG_structure_type, name: "bar", line: 3, size: 64, align: 32, file: !1, elements: !10) 91 !10 = !{!11, !13} 92 !11 = !MDDerivedType(tag: DW_TAG_member, name: "a", line: 4, size: 32, align: 32, file: !1, scope: !9, baseType: !12) 93 !12 = !MDBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 94 !13 = !MDDerivedType(tag: DW_TAG_member, name: "b", line: 5, size: 32, align: 32, offset: 32, file: !1, scope: !9, baseType: !12) 95 !14 = !{!15, !16} 96 !15 = !MDLocalVariable(tag: DW_TAG_arg_variable, name: "b", line: 10, arg: 1, scope: !4, file: !5, type: !8) 97 !16 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "a", line: 12, scope: !4, file: !5, type: !12) 98 !17 = !MDSubprogram(name: "main", line: 16, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, scopeLine: 17, file: !1, scope: !5, type: !18, function: i32 ()* @main, variables: !20) 99 !18 = !MDSubroutineType(types: !19) 100 !19 = !{!12} 101 !20 = !{!21} 102 !21 = !MDLocalVariable(tag: DW_TAG_auto_variable, name: "myBar", line: 18, scope: !17, file: !5, type: !9) 103 !22 = !{i32 2, !"Dwarf Version", i32 2} 104 !23 = !{i32 1, !"Debug Info Version", i32 3} 105 !24 = !{!"clang version 3.5 "} 106 !25 = !MDLocation(line: 10, scope: !4) 107 !26 = !MDLocation(line: 12, scope: !4) 108 !27 = !{!28, !29, i64 0} 109 !28 = !{!"bar", !29, i64 0, !29, i64 4} 110 !29 = !{!"int", !30, i64 0} 111 !30 = !{!"omnipotent char", !31, i64 0} 112 !31 = !{!"Simple C/C++ TBAA"} 113 !32 = !MDLocation(line: 13, scope: !4) 114 !33 = !MDLocation(line: 14, scope: !4) 115 !34 = !MDLocation(line: 18, scope: !17) 116 !35 = !MDLocation(line: 19, scope: !17) 117 !36 = !MDLocation(line: 20, scope: !17) 118
