1 ; REQUIRES: object-emission 2 3 ; Check that when variables are allocated on the stack we generate debug locations 4 ; for the stack location directly instead of generating a register+offset indirection. 5 6 ; RUN: llc -O2 -filetype=obj -disable-post-ra -mtriple=x86_64-unknown-linux-gnu < %s \ 7 ; RUN: | llvm-dwarfdump -v - | FileCheck %s 8 ; 9 ; int data = 17; 10 ; int sum = 0; 11 ; int zero = 0; 12 ; int *ptr; 13 ; 14 ; extern void foo(int i, int *p); 15 ; 16 ; int main() 17 ; { 18 ; int val; 19 ; val = data; 20 ; foo(1, &val); 21 ; foo(2, &data); 22 ; return zero; 23 ; } 24 ; 25 ; CHECK: .debug_info contents 26 ; CHECK: DW_TAG_subprogram 27 ; CHECK-NOT: NULL 28 ; CHECK: DW_TAG_variable 29 ; CHECK: DW_AT_location [DW_FORM_sec_offset] ({{.*}} 30 ; CHECK-NEXT: [{{0x.*}}, {{0x.*}}): DW_OP_reg0 RAX 31 ; 32 ; Note: This is a location, so we don't want an extra DW_OP_deref at the end. 33 ; LLDB gets the location right without it: 34 ; Variable: ... name = "val", type = "int", location = [rsp+4], decl = frame.c:10 35 ; Adding the deref actually creates an invalid location: 36 ; ... [rsp+4] DW_OP_deref 37 ; 38 ; CHECK-NEXT: [{{0x.*}}, {{0x.*}}): DW_OP_breg7 RSP+4) 39 ; CHECK-NEXT: DW_AT_name {{.*}}"val" 40 41 ; ModuleID = 'frame.c' 42 source_filename = "frame.c" 43 44 @data = global i32 17, align 4, !dbg !0 45 @sum = local_unnamed_addr global i32 0, align 4, !dbg !6 46 @zero = local_unnamed_addr global i32 0, align 4, !dbg !9 47 @ptr = common local_unnamed_addr global i32* null, align 8, !dbg !11 48 49 define i32 @main() local_unnamed_addr !dbg !17 { 50 entry: 51 %val = alloca i32, align 4 52 %0 = bitcast i32* %val to i8*, !dbg !22 53 call void @llvm.lifetime.start(i64 4, i8* %0), !dbg !22 54 %1 = load i32, i32* @data, align 4, !dbg !23, !tbaa !24 55 tail call void @llvm.dbg.value(metadata i32 %1, metadata !21, metadata !28), !dbg !29 56 store i32 %1, i32* %val, align 4, !dbg !30, !tbaa !24 57 tail call void @llvm.dbg.value(metadata i32* %val, metadata !21, metadata !31), !dbg !29 58 call void @foo(i32 1, i32* nonnull %val), !dbg !32 59 call void @foo(i32 2, i32* nonnull @data), !dbg !33 60 %2 = load i32, i32* @zero, align 4, !dbg !34, !tbaa !24 61 call void @llvm.lifetime.end(i64 4, i8* %0), !dbg !35 62 ret i32 %2, !dbg !36 63 } 64 65 ; Function Attrs: argmemonly nounwind 66 declare void @llvm.lifetime.start(i64, i8* nocapture) #0 67 68 declare void @foo(i32, i32*) local_unnamed_addr 69 70 ; Function Attrs: argmemonly nounwind 71 declare void @llvm.lifetime.end(i64, i8* nocapture) #0 72 73 ; Function Attrs: nounwind readnone 74 declare void @llvm.dbg.value(metadata, metadata, metadata) #1 75 76 attributes #0 = { argmemonly nounwind } 77 attributes #1 = { nounwind readnone } 78 79 !llvm.dbg.cu = !{!2} 80 !llvm.module.flags = !{!14, !15} 81 !llvm.ident = !{!16} 82 83 !0 = distinct !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) 84 !1 = !DIGlobalVariable(name: "data", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true) 85 !2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 3.9.0 (trunk 273961)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5) 86 !3 = !DIFile(filename: "frame.c", directory: "/home/user/test") 87 !4 = !{} 88 !5 = !{!0, !6, !9, !11} 89 !6 = distinct !DIGlobalVariableExpression(var: !7, expr: !DIExpression()) 90 !7 = !DIGlobalVariable(name: "sum", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true) 91 !8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 92 !9 = distinct !DIGlobalVariableExpression(var: !10, expr: !DIExpression()) 93 !10 = !DIGlobalVariable(name: "zero", scope: !2, file: !3, line: 3, type: !8, isLocal: false, isDefinition: true) 94 !11 = distinct !DIGlobalVariableExpression(var: !12, expr: !DIExpression()) 95 !12 = !DIGlobalVariable(name: "ptr", scope: !2, file: !3, line: 4, type: !13, isLocal: false, isDefinition: true) 96 !13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64, align: 64) 97 !14 = !{i32 2, !"Dwarf Version", i32 4} 98 !15 = !{i32 2, !"Debug Info Version", i32 3} 99 !16 = !{!"clang version 3.9.0 (trunk 273961)"} 100 !17 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 8, type: !18, isLocal: false, isDefinition: true, scopeLine: 9, isOptimized: true, unit: !2, retainedNodes: !20) 101 !18 = !DISubroutineType(types: !19) 102 !19 = !{!8} 103 !20 = !{!21} 104 !21 = !DILocalVariable(name: "val", scope: !17, file: !3, line: 10, type: !8) 105 !22 = !DILocation(line: 10, column: 3, scope: !17) 106 !23 = !DILocation(line: 11, column: 9, scope: !17) 107 !24 = !{!25, !25, i64 0} 108 !25 = !{!"int", !26, i64 0} 109 !26 = !{!"omnipotent char", !27, i64 0} 110 !27 = !{!"Simple C/C++ TBAA"} 111 !28 = !DIExpression() 112 !29 = !DILocation(line: 10, column: 7, scope: !17) 113 !30 = !DILocation(line: 11, column: 7, scope: !17) 114 !31 = !DIExpression(DW_OP_deref) 115 !32 = !DILocation(line: 12, column: 3, scope: !17) 116 !33 = !DILocation(line: 13, column: 3, scope: !17) 117 !34 = !DILocation(line: 14, column: 10, scope: !17) 118 !35 = !DILocation(line: 15, column: 1, scope: !17) 119 !36 = !DILocation(line: 14, column: 3, scope: !17) 120 121
