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llvm-project/llvm/test/DebugInfo/X86/dbg-value-funcarg.ll
Stephen Tozer c383f4d655 [DebugInfo] Allow non-stack_value variadic expressions and use in DBG_INSTR_REF 
Prior to this patch, variadic DIExpressions (i.e. ones that contain
DW_OP_LLVM_arg) could only be created by salvaging debug values to create
stack value expressions, resulting in a DBG_VALUE_LIST being created. As of
the previous patch in this patch stack, DBG_INSTR_REF's syntax has been
changed to match DBG_VALUE_LIST in preparation for supporting variadic
expressions. This patch adds some minor changes needed to allow variadic
expressions that aren't stack values to exist, and allows variadic expressions
that are trivially reduceable to non-variadic expressions to be handled
similarly to non-variadic expressions.

Reviewed by: jmorse

Differential Revision: https://reviews.llvm.org/D133926
2023-01-06 19:31:10 +00:00

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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -start-after=codegenprepare -stop-before=finalize-isel -o - %s -experimental-debug-variable-locations=false | FileCheck %s --check-prefixes=COMMON,CHECK
; RUN: llc -mtriple=x86_64-unknown-linux-gnu -start-after=codegenprepare -stop-before=finalize-isel -o - %s -experimental-debug-variable-locations=true | FileCheck %s --check-prefixes=COMMON,INSTRREF
; Input to this test looked like this and was compiled using: clang -g -O1 -mllvm -stop-after=codegenprepare -S
;
; extern void bar(int);
;
; void foo_local(int t1a) {
; int local = 123;
; bar(local);
; local = t1a;
; bar(local);
; }
;
; void foo_other_param(int t2a, int t2b) {
; bar(t2b);
; t2b = 123;
; bar(t2b);
; t2b = t2a;
; bar(t2b);
; }
;
; void foo_same_param(int t3a) {
; bar(t3a);
; int tmp = t3a;
; t3a = 123;
; bar(t3a);
; t3a = tmp;
; bar(t3a);
; }
;
; Catch metadata references for involved variables.
;
; COMMON-DAG: ![[T1A:.*]] = !DILocalVariable(name: "t1a"
; COMMON-DAG: ![[LOCAL:.*]] = !DILocalVariable(name: "local"
; COMMON-DAG: ![[T2A:.*]] = !DILocalVariable(name: "t2a"
; COMMON-DAG: ![[T2B:.*]] = !DILocalVariable(name: "t2b"
; COMMON-DAG: ![[T3A:.*]] = !DILocalVariable(name: "t3a"
; COMMON-DAG: ![[TMP:.*]] = !DILocalVariable(name: "tmp"
define dso_local void @foo_local(i32 %t1a) local_unnamed_addr #0 !dbg !7 {
; CHECK-LABEL: name: foo_local
; CHECK-NOT: DBG_VALUE
; CHECK: DBG_VALUE $edi, $noreg, ![[T1A]], !DIExpression(),
; CHECK-NEXT: %0:gr32 = COPY $edi
; CHECK-NEXT: DBG_VALUE %0, $noreg, ![[T1A]], !DIExpression(),
; CHECK-NEXT: DBG_VALUE 123, $noreg, ![[LOCAL]], !DIExpression(),
; CHECK-NOT: DBG_VALUE
; CHECK: CALL64pcrel32 @bar,
; CHECK: DBG_VALUE %0, $noreg, ![[LOCAL]], !DIExpression(),
; CHECK: DBG_VALUE $edi, $noreg, ![[T1A]], !DIExpression(),
; CHECK-NOT: DBG_VALUE
; CHECK: TCRETURNdi64 @bar,
; INSTRREF-LABEL: name: foo_local
; INSTRREF-NOT: DBG_
; INSTRREF: DBG_PHI $edi, 1
; INSTRREF: DBG_VALUE $edi, $noreg, ![[T1A]], !DIExpression(),
; INSTRREF-NEXT: %0:gr32 = COPY $edi
; INSTRREF-NEXT: DBG_VALUE 123, $noreg, ![[LOCAL]], !DIExpression(),
; INSTRREF: CALL64pcrel32 @bar,
; INSTRREF-NEXT: ADJCALLSTACKUP64
; INSTRREF: DBG_INSTR_REF ![[LOCAL]], !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0),
; INSTRREF-NOT: DBG_
; INSTRREF: TCRETURNdi64 @bar,
entry:
call void @llvm.dbg.value(metadata i32 %t1a, metadata !12, metadata !DIExpression()), !dbg !14
call void @llvm.dbg.value(metadata i32 123, metadata !13, metadata !DIExpression()), !dbg !15
tail call void @bar(i32 123) #3, !dbg !16
call void @llvm.dbg.value(metadata i32 %t1a, metadata !13, metadata !DIExpression()), !dbg !15
tail call void @bar(i32 %t1a) #3, !dbg !17
ret void, !dbg !18
}
define dso_local void @foo_other_param(i32 %t2a, i32 %t2b) local_unnamed_addr #0 !dbg !19 {
; CHECK-LABEL: name: foo_other_param
; CHECK: DBG_VALUE $edi, $noreg, ![[T2A]], !DIExpression(),
; CHECK: DBG_VALUE $esi, $noreg, ![[T2B]], !DIExpression(),
; CHECK: %1:gr32 = COPY $esi
; CHECK: DBG_VALUE %1, $noreg, ![[T2B]], !DIExpression(),
; CHECK: %0:gr32 = COPY $edi
; CHECK: DBG_VALUE %0, $noreg, ![[T2A]], !DIExpression(),
; CHECK: DBG_VALUE $edi, $noreg, ![[T2B]], !DIExpression(),
; CHECK: CALL64pcrel32 @bar,
; CHECK: DBG_VALUE 123, $noreg, ![[T2B]], !DIExpression(),
; CHECK: CALL64pcrel32 @bar,
; CHECK: DBG_VALUE %0, $noreg, ![[T2B]], !DIExpression(),
; CHECK: DBG_VALUE $edi, $noreg, ![[T2A]], !DIExpression(),
; CHECK: TCRETURNdi64 @bar,
; INSTRREF-LABEL: name: foo_other_param
; INSTRREF: DBG_PHI $edi, 1
; INSTRREF: DBG_VALUE $edi, $noreg, ![[T2A]], !DIExpression(),
; INSTRREF: DBG_VALUE $esi, $noreg, ![[T2B]], !DIExpression(),
; INSTRREF: CALL64pcrel32 @bar,
; INSTRREF: DBG_VALUE 123, $noreg, ![[T2B]], !DIExpression(),
; INSTRREF: CALL64pcrel32 @bar,
; INSTRREF: DBG_INSTR_REF ![[T2B]], !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0),
; INSTRREF: TCRETURNdi64 @bar,
entry:
call void @llvm.dbg.value(metadata i32 %t2a, metadata !23, metadata !DIExpression()), !dbg !25
call void @llvm.dbg.value(metadata i32 %t2b, metadata !24, metadata !DIExpression()), !dbg !26
tail call void @bar(i32 %t2b) #3, !dbg !27
call void @llvm.dbg.value(metadata i32 123, metadata !24, metadata !DIExpression()), !dbg !26
tail call void @bar(i32 123) #3, !dbg !28
call void @llvm.dbg.value(metadata i32 %t2a, metadata !24, metadata !DIExpression()), !dbg !26
tail call void @bar(i32 %t2a) #3, !dbg !29
ret void, !dbg !30
}
define dso_local void @foo_same_param(i32 %t3a) local_unnamed_addr #0 !dbg !31 {
; CHECK-LABEL: name: foo_same_param
; CHECK: DBG_VALUE $edi, $noreg, ![[T3A]], !DIExpression(),
; CHECK: %0:gr32 = COPY $edi
; CHECK: DBG_VALUE %0, $noreg, ![[T3A]], !DIExpression(),
; CHECK: CALL64pcrel32 @bar,
; CHECK: DBG_VALUE %0, $noreg, ![[TMP]], !DIExpression(),
; CHECK: DBG_VALUE 123, $noreg, ![[T3A]], !DIExpression(),
; CHECK: CALL64pcrel32 @bar,
; CHECK: DBG_VALUE %0, $noreg, ![[T3A]], !DIExpression(),
; CHECK: TCRETURNdi64 @bar,
; INSTRREF-LABEL: name: foo_same_param
; INSTRREF: DBG_PHI $edi, 1
; INSTRREF: DBG_VALUE $edi, $noreg, ![[T3A]], !DIExpression(),
; INSTRREF: CALL64pcrel32 @bar,
; INSTRREF: DBG_INSTR_REF ![[TMP]], !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0),
; INSTRREF: DBG_VALUE 123, $noreg, ![[T3A]], !DIExpression(),
; INSTRREF: CALL64pcrel32 @bar,
; INSTRREF: DBG_INSTR_REF ![[T3A]], !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0),
; INSTRREF: TCRETURNdi64 @bar,
entry:
call void @llvm.dbg.value(metadata i32 %t3a, metadata !33, metadata !DIExpression()), !dbg !35
tail call void @bar(i32 %t3a) #3, !dbg !36
call void @llvm.dbg.value(metadata i32 %t3a, metadata !34, metadata !DIExpression()), !dbg !37
call void @llvm.dbg.value(metadata i32 123, metadata !33, metadata !DIExpression()), !dbg !35
tail call void @bar(i32 123) #3, !dbg !38
call void @llvm.dbg.value(metadata i32 %t3a, metadata !33, metadata !DIExpression()), !dbg !35
tail call void @bar(i32 %t3a) #3, !dbg !39
ret void, !dbg !40
}
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
declare dso_local void @bar(i32) local_unnamed_addr
attributes #0 = { nounwind uwtable }
attributes #2 = { nounwind readnone speculatable }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "foo.c", directory: "")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 9.0.0"}
!7 = distinct !DISubprogram(name: "foo_local", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
!8 = !DISubroutineType(types: !9)
!9 = !{null, !10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !{!12, !13}
!12 = !DILocalVariable(name: "t1a", arg: 1, scope: !7, file: !1, line: 3, type: !10)
!13 = !DILocalVariable(name: "local", scope: !7, file: !1, line: 4, type: !10)
!14 = !DILocation(line: 3, column: 20, scope: !7)
!15 = !DILocation(line: 4, column: 7, scope: !7)
!16 = !DILocation(line: 5, column: 3, scope: !7)
!17 = !DILocation(line: 7, column: 3, scope: !7)
!18 = !DILocation(line: 8, column: 1, scope: !7)
!19 = distinct !DISubprogram(name: "foo_other_param", scope: !1, file: !1, line: 10, type: !20, scopeLine: 10, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !22)
!20 = !DISubroutineType(types: !21)
!21 = !{null, !10, !10}
!22 = !{!23, !24}
!23 = !DILocalVariable(name: "t2a", arg: 1, scope: !19, file: !1, line: 10, type: !10)
!24 = !DILocalVariable(name: "t2b", arg: 2, scope: !19, file: !1, line: 10, type: !10)
!25 = !DILocation(line: 10, column: 26, scope: !19)
!26 = !DILocation(line: 10, column: 35, scope: !19)
!27 = !DILocation(line: 11, column: 3, scope: !19)
!28 = !DILocation(line: 13, column: 3, scope: !19)
!29 = !DILocation(line: 15, column: 3, scope: !19)
!30 = !DILocation(line: 16, column: 1, scope: !19)
!31 = distinct !DISubprogram(name: "foo_same_param", scope: !1, file: !1, line: 18, type: !8, scopeLine: 18, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !32)
!32 = !{!33, !34}
!33 = !DILocalVariable(name: "t3a", arg: 1, scope: !31, file: !1, line: 18, type: !10)
!34 = !DILocalVariable(name: "tmp", scope: !31, file: !1, line: 20, type: !10)
!35 = !DILocation(line: 18, column: 25, scope: !31)
!36 = !DILocation(line: 19, column: 3, scope: !31)
!37 = !DILocation(line: 20, column: 7, scope: !31)
!38 = !DILocation(line: 22, column: 3, scope: !31)
!39 = !DILocation(line: 24, column: 3, scope: !31)
!40 = !DILocation(line: 25, column: 1, scope: !31)
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