1; RUN: llc -debug-entry-values -filetype=asm -o - %s | FileCheck %s 2; RUN: llc -force-instr-ref-livedebugvalues=1 -debug-entry-values -filetype=asm -o - %s | FileCheck %s 3 4; Verify that the size operands of the DW_OP_GNU_entry_value operations are 5; correct for the multi-byte DW_OP_regx expressions. 6 7; Based on the following C reproducer: 8; 9; extern void clobber(); 10; double global; 11; int f(double a, double b) { 12; global = a + b; 13; clobber(); 14; return 1; 15; } 16 17; This test checks the assembly output rather than the output from 18; llvm-dwarfdump, as the latter printed the DW_OP_regx D0 correctly, even 19; though the entry value's size operand did not fully cover that: 20 21; DW_OP_GNU_entry_value(DW_OP_regx D0), DW_OP_stack_value 22; 23; whereas readelf interpreted it as an DW_OP_GNU_entry_value covering one byte, 24; resulting in garbage data: 25; 26; DW_OP_GNU_entry_value: (DW_OP_regx: 0 (r0)); DW_OP_breg16 (r16): 2; DW_OP_stack_value 27 28; CHECK: .byte 243 @ DW_OP_GNU_entry_value 29; CHECK-NEXT: .byte 3 @ 3 30; CHECK-NEXT: .byte 144 @ DW_OP_regx 31; CHECK-NEXT: .byte 128 @ 256 32; CHECK-NEXT: .byte 2 @ 33; CHECK-NEXT: .byte 159 @ DW_OP_stack_value 34 35; CHECK: .byte 243 @ DW_OP_GNU_entry_value 36; CHECK-NEXT: .byte 3 @ 3 37; CHECK-NEXT: .byte 144 @ DW_OP_regx 38; CHECK-NEXT: .byte 129 @ 257 39; CHECK-NEXT: .byte 2 @ 40; CHECK-NEXT: .byte 159 @ DW_OP_stack_value 41 42target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64" 43target triple = "armv7-unknown-unknown" 44 45@global = common global double 0.000000e+00, align 8, !dbg !0 46 47; Function Attrs: nounwind 48define arm_aapcs_vfpcc i32 @f(double %a, double %b) #0 !dbg !12 { 49entry: 50 call void @llvm.dbg.value(metadata double %a, metadata !17, metadata !DIExpression()), !dbg !19 51 call void @llvm.dbg.value(metadata double %b, metadata !18, metadata !DIExpression()), !dbg !19 52 %add = fadd double %a, %b, !dbg !20 53 store double %add, ptr @global, align 8, !dbg !20 54 tail call arm_aapcs_vfpcc void @clobber(), !dbg !21 55 ret i32 1, !dbg !22 56} 57 58declare arm_aapcs_vfpcc void @clobber() 59 60; Function Attrs: nounwind readnone speculatable willreturn 61declare void @llvm.dbg.value(metadata, metadata, metadata) #1 62 63attributes #0 = { nounwind } 64attributes #1 = { nounwind readnone speculatable willreturn } 65 66!llvm.dbg.cu = !{!2} 67!llvm.module.flags = !{!7, !8, !9, !10} 68!llvm.ident = !{!11} 69 70!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression()) 71!1 = distinct !DIGlobalVariable(name: "global", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true) 72!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None) 73!3 = !DIFile(filename: "entry-value-multi-byte-expr.c", directory: "/") 74!4 = !{} 75!5 = !{!0} 76!6 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float) 77!7 = !{i32 2, !"Dwarf Version", i32 4} 78!8 = !{i32 2, !"Debug Info Version", i32 3} 79!9 = !{i32 1, !"wchar_size", i32 4} 80!10 = !{i32 1, !"min_enum_size", i32 4} 81!11 = !{!"clang version 10.0.0"} 82!12 = distinct !DISubprogram(name: "f", scope: !3, file: !3, line: 6, type: !13, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16) 83!13 = !DISubroutineType(types: !14) 84!14 = !{!15, !6, !6} 85!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 86!16 = !{!17, !18} 87!17 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !3, line: 6, type: !6) 88!18 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !3, line: 6, type: !6) 89!19 = !DILocation(line: 0, scope: !12) 90!20 = !DILocation(line: 7, scope: !12) 91!21 = !DILocation(line: 8, scope: !12) 92!22 = !DILocation(line: 9, scope: !12) 93