1; RUN: llc -debug-entry-values -filetype=asm -o - %s | FileCheck %s
2
3; The q0 register does not have a DWARF register number, and is instead emitted
4; as a composite location description with two sub-registers. Previously we
5; emitted a single DW_OP_entry_value wrapping that whole composite location
6; description, but that is not valid DWARF; DW_OP_entry_value operations can
7; only hold DWARF expressions and register location descriptions.
8;
9; In the future we may want to emit a composite location description where each
10; DW_OP_regx operation is wrapped in an entry value operation, but for now
11; just verify that no invalid DWARF is emitted.
12
13target datalayout = "E-m:e-i64:64-n32:64-S128"
14target triple = "sparc64"
15
16; Based on the following C reproducer:
17;
18; volatile long double global;
19; extern void clobber();
20; int foo(long double p) {
21;   global = p;
22;   clobber();
23;   return 123;
24; }
25
26; Verify that we got an entry value in the DIExpression...
27; CHECK: DEBUG_VALUE: foo:p <- [DW_OP_LLVM_entry_value 1] $q0
28
29; ... but that no entry value location was emitted:
30; CHECK:      .half   8         ! Loc expr size
31; CHECK-NEXT: .byte   144       ! sub-register DW_OP_regx
32; CHECK-NEXT: .byte   72        ! 72
33; CHECK-NEXT: .byte   147       ! DW_OP_piece
34; CHECK-NEXT: .byte   8         ! 8
35; CHECK-NEXT: .byte   144       ! sub-register DW_OP_regx
36; CHECK-NEXT: .byte   73        ! 73
37; CHECK-NEXT: .byte   147       ! DW_OP_piece
38; CHECK-NEXT: .byte   8         ! 8
39; CHECK-NEXT: .xword  0
40; CHECK-NEXT: .xword  0
41
42@global = common global fp128 0xL00000000000000000000000000000000, align 16, !dbg !0
43
44; Function Attrs: nounwind
45define signext i32 @foo(fp128 %p) #0 !dbg !12 {
46entry:
47  call void @llvm.dbg.value(metadata fp128 %p, metadata !17, metadata !DIExpression()), !dbg !18
48  store volatile fp128 %p, fp128* @global, align 16, !dbg !19
49  tail call void @clobber(), !dbg !20
50  ret i32 123, !dbg !21
51}
52
53declare void @clobber()
54
55; Function Attrs: nounwind readnone speculatable willreturn
56declare void @llvm.dbg.value(metadata, metadata, metadata) #1
57
58attributes #0 = { nounwind }
59attributes #1 = { nounwind readnone speculatable willreturn }
60
61!llvm.dbg.cu = !{!2}
62!llvm.module.flags = !{!8, !9, !10}
63!llvm.ident = !{!11}
64
65!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
66!1 = distinct !DIGlobalVariable(name: "global", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
67!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)
68!3 = !DIFile(filename: "entry-value-complex-reg-expr.c", directory: "/")
69!4 = !{}
70!5 = !{!0}
71!6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
72!7 = !DIBasicType(name: "long double", size: 128, encoding: DW_ATE_float)
73!8 = !{i32 2, !"Dwarf Version", i32 4}
74!9 = !{i32 2, !"Debug Info Version", i32 3}
75!10 = !{i32 1, !"wchar_size", i32 4}
76!11 = !{!"clang version 10.0.0"}
77!12 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 3, type: !13, scopeLine: 3, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !16)
78!13 = !DISubroutineType(types: !14)
79!14 = !{!15, !7}
80!15 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
81!16 = !{!17}
82!17 = !DILocalVariable(name: "p", arg: 1, scope: !12, file: !3, line: 3, type: !7)
83!18 = !DILocation(line: 0, scope: !12)
84!19 = !DILocation(line: 4, scope: !12)
85!20 = !DILocation(line: 5, scope: !12)
86!21 = !DILocation(line: 6, scope: !12)
87