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llvm-project/llvm/test/DebugInfo/X86/dbg-value-funcarg2.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

138 lines
7.3 KiB
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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=CHECK,COMMON
; 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=INSTRREF,COMMON
; Test case was generated from the following C code,
; using: clang -g -O1 -S -emit-llvm s.c -o s.ll
;
; struct s { long long int i, j; };
;
; extern void bar(struct s, struct s, struct s);
;
; int f(struct s s1, struct s s2) {
; volatile struct s tmp = {0};
; bar(s1, s2, tmp);
; s1.i = s2.i;
; s1.j = s2.j;
; return s1.j + s1.j;
; }
; Catch metadata references for involved variables.
;
; COMMON-DAG: ![[S1:.*]] = !DILocalVariable(name: "s1"
; COMMON-DAG: ![[S2:.*]] = !DILocalVariable(name: "s2"
define dso_local i32 @f(i64 %s1.coerce0, i64 %s1.coerce1, i64 %s2.coerce0, i64 %s2.coerce1) local_unnamed_addr #0 !dbg !7 {
; We expect DBG_VALUE instructions for the arguments at the entry.
; In instr-ref mode, there'll be some DBG_PHIs in there too.
; COMMON-LABEL: name: f
; COMMON-NOT: DBG_VALUE
; INSTRREF-DAG: DBG_PHI $rcx, 2
; INSTRREF-DAG: DBG_PHI $rdx, 1
; COMMON-DAG: DBG_VALUE $rdi, $noreg, ![[S1]], !DIExpression(DW_OP_LLVM_fragment, 0, 64)
; COMMON-DAG: DBG_VALUE $rsi, $noreg, ![[S1]], !DIExpression(DW_OP_LLVM_fragment, 64, 64)
; COMMON-DAG: DBG_VALUE $rdx, $noreg, ![[S2]], !DIExpression(DW_OP_LLVM_fragment, 0, 64)
; COMMON-DAG: DBG_VALUE $rcx, $noreg, ![[S2]], !DIExpression(DW_OP_LLVM_fragment, 64, 64)
; COMMON-NOT: DBG_
; Then arguments are copied to virtual registers.
; CHECK-NOT: DBG_VALUE
; CHECK-DAG: %[[R1:.*]]:gr64 = COPY $rcx
; CHECK-DAG: DBG_VALUE %[[R1]], $noreg, ![[S2]], !DIExpression(DW_OP_LLVM_fragment, 64, 64)
; CHECK-DAG: %[[R2:.*]]:gr64 = COPY $rdx
; CHECK-DAG: DBG_VALUE %[[R2]], $noreg, ![[S2]], !DIExpression(DW_OP_LLVM_fragment, 0, 64)
; CHECK-DAG: %[[R3:.*]]:gr64 = COPY $rsi
; CHECK-DAG: DBG_VALUE %[[R3]], $noreg, ![[S1]], !DIExpression(DW_OP_LLVM_fragment, 64, 64)
; CHECK-DAG: %[[R4:.*]]:gr64 = COPY $rdi
; CHECK-DAG: DBG_VALUE %[[R4]], $noreg, ![[S1]], !DIExpression(DW_OP_LLVM_fragment, 0, 64)
; CHECK-NOT: DBG_VALUE
; We have the call to bar.
; COMMON: ADJCALLSTACKDOWN
; COMMON: CALL64pcrel32 @bar
; After the call we expect to find new DBG_VALUE instructions for "s1".
; CHECK: ADJCALLSTACKUP
; CHECK-NOT: DBG_VALUE
; CHECK-DAG: DBG_VALUE %[[R2]], $noreg, ![[S1]], !DIExpression(DW_OP_LLVM_fragment, 0, 64)
; CHECK-DAG: DBG_VALUE %[[R1]], $noreg, ![[S1]], !DIExpression(DW_OP_LLVM_fragment, 64, 64)
;; In instruction referencing mode, we should refer to the instruction number
;; of the earlier DBG_PHIs.
; INSTRREF: ADJCALLSTACKUP
; INSTRREF-NOT: DBG_
; INSTRREF-DAG: DBG_INSTR_REF ![[S1]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_fragment, 0, 64), dbg-instr-ref(1, 0)
; INSTRREF-DAG: DBG_INSTR_REF ![[S1]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_fragment, 64, 64), dbg-instr-ref(2, 0)
; And then no more DBG_ instructions before the add.
; COMMON-NOT: DBG_
; COMMON: ADD32rr
entry:
%tmp.sroa.0 = alloca i64, align 8
%tmp.sroa.4 = alloca i64, align 8
call void @llvm.dbg.declare(metadata ptr %tmp.sroa.0, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)), !dbg !21
call void @llvm.dbg.declare(metadata ptr %tmp.sroa.4, metadata !19, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)), !dbg !21
call void @llvm.dbg.value(metadata i64 %s1.coerce0, metadata !17, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)), !dbg !22
call void @llvm.dbg.value(metadata i64 %s1.coerce1, metadata !17, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)), !dbg !22
call void @llvm.dbg.value(metadata i64 %s2.coerce0, metadata !18, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)), !dbg !23
call void @llvm.dbg.value(metadata i64 %s2.coerce1, metadata !18, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)), !dbg !23
call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %tmp.sroa.0), !dbg !24
call void @llvm.lifetime.start.p0(i64 8, ptr nonnull %tmp.sroa.4), !dbg !24
store volatile i64 0, ptr %tmp.sroa.0, align 8, !dbg !21
store volatile i64 0, ptr %tmp.sroa.4, align 8, !dbg !21
tail call void @bar(i64 %s1.coerce0, i64 %s1.coerce1, i64 %s2.coerce0, i64 %s2.coerce1, i64 0, i64 0) #4, !dbg !25
call void @llvm.dbg.value(metadata i64 %s2.coerce0, metadata !17, metadata !DIExpression(DW_OP_LLVM_fragment, 0, 64)), !dbg !22
call void @llvm.dbg.value(metadata i64 %s2.coerce1, metadata !17, metadata !DIExpression(DW_OP_LLVM_fragment, 64, 64)), !dbg !22
%s2.coerce1.tr = trunc i64 %s2.coerce1 to i32, !dbg !26
%conv = shl i32 %s2.coerce1.tr, 1, !dbg !26
call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %tmp.sroa.0), !dbg !27
call void @llvm.lifetime.end.p0(i64 8, ptr nonnull %tmp.sroa.4), !dbg !27
ret i32 %conv, !dbg !28
}
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
declare void @llvm.lifetime.start.p0(i64, ptr nocapture) #2
declare void @llvm.lifetime.end.p0(i64, ptr nocapture) #2
declare dso_local void @bar(i64, i64, i64, i64, i64, i64) local_unnamed_addr
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { argmemonly nounwind }
attributes #4 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "llvm-svn @ 353529", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
!1 = !DIFile(filename: "s.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 = !{!"llvm-svn @ 353529"}
!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 5, type: !8, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !16)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 1, size: 128, elements: !12)
!12 = !{!13, !15}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !11, file: !1, line: 1, baseType: !14, size: 64)
!14 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
!15 = !DIDerivedType(tag: DW_TAG_member, name: "j", scope: !11, file: !1, line: 1, baseType: !14, size: 64, offset: 64)
!16 = !{!17, !18, !19}
!17 = !DILocalVariable(name: "s1", arg: 1, scope: !7, file: !1, line: 5, type: !11)
!18 = !DILocalVariable(name: "s2", arg: 2, scope: !7, file: !1, line: 5, type: !11)
!19 = !DILocalVariable(name: "tmp", scope: !7, file: !1, line: 6, type: !20)
!20 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !11)
!21 = !DILocation(line: 6, column: 21, scope: !7)
!22 = !DILocation(line: 5, column: 16, scope: !7)
!23 = !DILocation(line: 5, column: 29, scope: !7)
!24 = !DILocation(line: 6, column: 3, scope: !7)
!25 = !DILocation(line: 7, column: 3, scope: !7)
!26 = !DILocation(line: 10, column: 10, scope: !7)
!27 = !DILocation(line: 11, column: 1, scope: !7)
!28 = !DILocation(line: 10, column: 3, scope: !7)
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