1 ; RUN: llc -debug-entry-values -filetype=asm -o - %s | FileCheck %s
3 ; Verify that the size operands of the DW_OP_GNU_entry_value operations are
4 ; correct for the multi-byte DW_OP_regx expressions.
6 ; Based on the following C reproducer:
8 ; extern void clobber();
10 ; int f(double a, double b) {
16 ; This test checks the assembly output rather than the output from
17 ; llvm-dwarfdump, as the latter printed the DW_OP_regx D0 correctly, even
18 ; though the entry value's size operand did not fully cover that:
20 ; DW_OP_GNU_entry_value(DW_OP_regx D0), DW_OP_stack_value
22 ; whereas readelf interpreted it as an DW_OP_GNU_entry_value covering one byte,
23 ; resulting in garbage data:
25 ; DW_OP_GNU_entry_value: (DW_OP_regx: 0 (r0)); DW_OP_breg16 (r16): 2; DW_OP_stack_value
27 ; CHECK: .byte 243 @ DW_OP_GNU_entry_value
28 ; CHECK-NEXT: .byte 3 @ 3
29 ; CHECK-NEXT: .byte 144 @ DW_OP_regx
30 ; CHECK-NEXT: .byte 128 @ 256
31 ; CHECK-NEXT: .byte 2 @
32 ; CHECK-NEXT: .byte 159 @ DW_OP_stack_value
34 ; CHECK: .byte 243 @ DW_OP_GNU_entry_value
35 ; CHECK-NEXT: .byte 3 @ 3
36 ; CHECK-NEXT: .byte 144 @ DW_OP_regx
37 ; CHECK-NEXT: .byte 129 @ 257
38 ; CHECK-NEXT: .byte 2 @
39 ; CHECK-NEXT: .byte 159 @ DW_OP_stack_value
41 target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
42 target triple = "armv7-unknown-unknown"
44 @global = common global double 0.000000e+00, align 8, !dbg !0
46 ; Function Attrs: nounwind
47 define arm_aapcs_vfpcc i32 @f(double %a, double %b) #0 !dbg !12 {
49 call void @llvm.dbg.value(metadata double %a, metadata !17, metadata !DIExpression()), !dbg !19
50 call void @llvm.dbg.value(metadata double %b, metadata !18, metadata !DIExpression()), !dbg !19
51 %add = fadd double %a, %b, !dbg !20
52 store double %add, double* @global, align 8, !dbg !20
53 tail call arm_aapcs_vfpcc void @clobber(), !dbg !21
57 declare arm_aapcs_vfpcc void @clobber()
59 ; Function Attrs: nounwind readnone speculatable willreturn
60 declare void @llvm.dbg.value(metadata, metadata, metadata) #1
62 attributes #0 = { nounwind }
63 attributes #1 = { nounwind readnone speculatable willreturn }
66 !llvm.module.flags = !{!7, !8, !9, !10}
69 !0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
70 !1 = distinct !DIGlobalVariable(name: "global", scope: !2, file: !3, line: 4, type: !6, isLocal: false, isDefinition: true)
71 !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)
72 !3 = !DIFile(filename: "entry-value-multi-byte-expr.c", directory: "/")
75 !6 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
76 !7 = !{i32 2, !"Dwarf Version", i32 4}
77 !8 = !{i32 2, !"Debug Info Version", i32 3}
78 !9 = !{i32 1, !"wchar_size", i32 4}
79 !10 = !{i32 1, !"min_enum_size", i32 4}
80 !11 = !{!"clang version 10.0.0"}
81 !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)
82 !13 = !DISubroutineType(types: !14)
84 !15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
86 !17 = !DILocalVariable(name: "a", arg: 1, scope: !12, file: !3, line: 6, type: !6, flags: DIFlagArgumentNotModified)
87 !18 = !DILocalVariable(name: "b", arg: 2, scope: !12, file: !3, line: 6, type: !6, flags: DIFlagArgumentNotModified)
88 !19 = !DILocation(line: 0, scope: !12)
89 !20 = !DILocation(line: 7, scope: !12)
90 !21 = !DILocation(line: 8, scope: !12)
91 !22 = !DILocation(line: 9, scope: !12)