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