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clang-p2996/llvm/test/DebugInfo/Generic/assignment-tracking/simplifycfg/empty-block.ll
Stephen Tozer 094572701d [RemoveDIs] Print IR with debug records by default (#91724) 
This patch makes the final major change of the RemoveDIs project, changing the
default IR output from debug intrinsics to debug records. This is expected to
break a large number of tests: every single one that tests for uses or
declarations of debug intrinsics and does not explicitly disable writing
records. 

If this patch has broken your downstream tests (or upstream tests on a
configuration I wasn't able to run):
1. If you need to immediately unblock a build, pass
`--write-experimental-debuginfo=false` to LLVM's option processing for all
failing tests (remember to use `-mllvm` for clang/flang to forward arguments to
LLVM).
2. For most test failures, the changes are trivial and mechanical, enough that
they can be done by script; see the migration guide for a guide on how to do
this: https://llvm.org/docs/RemoveDIsDebugInfo.html#test-updates
3. If any tests fail for reasons other than FileCheck check lines that need
updating, such as assertion failures, that is most likely a real bug with this
patch and should be reported as such.

For more information, see the recent PSA:
https://discourse.llvm.org/t/psa-ir-output-changing-from-debug-intrinsics-to-debug-records/79578
2024-06-14 15:07:27 +01:00

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; RUN: opt -S %s -passes=simplifycfg -o - \
; RUN: | FileCheck %s
; RUN: opt --try-experimental-debuginfo-iterators -S %s -passes=simplifycfg -o - \
; RUN: | FileCheck %s
;; $ cat test.cpp
;; class a {};
;; void operator*(a, float &);
;; class b {
;; public:
;; a c;
;; };
;; int d;
;; class e {
;; b g[3];
;; float f;
;; void i();
;; };
;; void e::i() {
;; float h;
;; g[d].c *h;
;; if (h)
;; h = f;
;; else
;; h = f;
;; }
;; Generated by grabbing IR before simplifycfg in:
;; $ clang++ -O2 -g -c test.cpp -Xclang -fexperimental-assignment-tracking
;; if.then and if.else each only have a dbg.assign and br instruction.
;; SimplifyCFG will remove these blocks. Check that the dbg.assign intrinsics
;; are sunk into the succ beforehand.
; CHECK: entry:
;; -- alloca dbg.assign
; CHECK: #dbg_assign(i1 undef
;; -- sunk dbg.assigns
; CHECK: #dbg_assign(float undef, ![[var:[0-9]+]], !DIExpression(), ![[id:[0-9]+]], ptr %h, !DIExpression(),
; CHECK-NEXT: #dbg_assign(float undef, ![[var]], !DIExpression(), ![[id]], ptr %h, !DIExpression(),
; CHECK-NEXT: %storemerge.in = getelementptr
; CHECK-NEXT: %storemerge = load float
; CHECK-NEXT: store float %storemerge, ptr %h, align 4{{.+}}!DIAssignID ![[id]]
; CHECK: ret void
%class.e = type { [3 x %class.b], float }
%class.b = type { %class.a }
%class.a = type { i8 }
@d = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
; Function Attrs: uwtable
define dso_local void @_ZN1e1iEv(ptr %this) local_unnamed_addr #0 align 2 !dbg !11 {
entry:
%h = alloca float, align 4, !DIAssignID !32
call void @llvm.dbg.assign(metadata i1 undef, metadata !31, metadata !DIExpression(), metadata !32, metadata ptr %h, metadata !DIExpression()), !dbg !33
%0 = bitcast ptr %h to ptr, !dbg !34
call void @llvm.lifetime.start.p0(i64 4, ptr nonnull %0) #4, !dbg !34
call void @_Zml1aRf(ptr nonnull align 4 dereferenceable(4) %h), !dbg !35
%1 = load float, ptr %h, align 4, !dbg !36
%tobool = fcmp une float %1, 0.000000e+00, !dbg !36
br i1 %tobool, label %if.then, label %if.else, !dbg !42
if.then: ; preds = %entry
call void @llvm.dbg.assign(metadata float undef, metadata !31, metadata !DIExpression(), metadata !43, metadata ptr %h, metadata !DIExpression()), !dbg !33
br label %if.end, !dbg !44
if.else: ; preds = %entry
call void @llvm.dbg.assign(metadata float undef, metadata !31, metadata !DIExpression(), metadata !43, metadata ptr %h, metadata !DIExpression()), !dbg !33
br label %if.end
if.end: ; preds = %if.else, %if.then
%storemerge.in = getelementptr inbounds %class.e, ptr %this, i64 0, i32 1, !dbg !45
%storemerge = load float, ptr %storemerge.in, align 4, !dbg !45
store float %storemerge, ptr %h, align 4, !dbg !45, !DIAssignID !43
call void @llvm.lifetime.end.p0(i64 4, ptr nonnull %0) #4, !dbg !48
ret void, !dbg !48
}
declare void @llvm.lifetime.start.p0(i64 immarg, ptr nocapture) #1
declare !dbg !49 dso_local void @_Zml1aRf(ptr nonnull align 4 dereferenceable(4)) local_unnamed_addr #2
declare void @llvm.lifetime.end.p0(i64 immarg, ptr nocapture) #1
declare void @llvm.dbg.assign(metadata, metadata, metadata, metadata, metadata, metadata) #3
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8, !9, !1000}
!llvm.ident = !{!10}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 7, type: !6, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 12.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, splitDebugInlining: false, nameTableKind: None)
!3 = !DIFile(filename: "test.cpp", directory: "/")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{i32 7, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 4}
!10 = !{!"clang version 12.0.0"}
!11 = distinct !DISubprogram(name: "i", linkageName: "_ZN1e1iEv", scope: !12, file: !3, line: 13, type: !25, scopeLine: 13, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, declaration: !24, retainedNodes: !28)
!12 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "e", file: !3, line: 8, size: 64, flags: DIFlagTypePassByValue, elements: !13, identifier: "_ZTS1e")
!13 = !{!14, !22, !24}
!14 = !DIDerivedType(tag: DW_TAG_member, name: "g", scope: !12, file: !3, line: 9, baseType: !15, size: 24)
!15 = !DICompositeType(tag: DW_TAG_array_type, baseType: !16, size: 24, elements: !20)
!16 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "b", file: !3, line: 3, size: 8, flags: DIFlagTypePassByValue, elements: !17, identifier: "_ZTS1b")
!17 = !{!18}
!18 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !16, file: !3, line: 5, baseType: !19, size: 8, flags: DIFlagPublic)
!19 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "a", file: !3, line: 1, size: 8, flags: DIFlagTypePassByValue, elements: !4, identifier: "_ZTS1a")
!20 = !{!21}
!21 = !DISubrange(count: 3)
!22 = !DIDerivedType(tag: DW_TAG_member, name: "f", scope: !12, file: !3, line: 10, baseType: !23, size: 32, offset: 32)
!23 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
!24 = !DISubprogram(name: "i", linkageName: "_ZN1e1iEv", scope: !12, file: !3, line: 11, type: !25, scopeLine: 11, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized)
!25 = !DISubroutineType(types: !26)
!26 = !{null, !27}
!27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!28 = !{!29, !31}
!29 = !DILocalVariable(name: "this", arg: 1, scope: !11, type: !30, flags: DIFlagArtificial | DIFlagObjectPointer)
!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
!31 = !DILocalVariable(name: "h", scope: !11, file: !3, line: 14, type: !23)
!32 = distinct !DIAssignID()
!33 = !DILocation(line: 0, scope: !11)
!34 = !DILocation(line: 14, column: 3, scope: !11)
!35 = !DILocation(line: 15, column: 10, scope: !11)
!36 = !DILocation(line: 16, column: 7, scope: !37)
!37 = distinct !DILexicalBlock(scope: !11, file: !3, line: 16, column: 7)
!42 = !DILocation(line: 16, column: 7, scope: !11)
!43 = distinct !DIAssignID()
!44 = !DILocation(line: 17, column: 5, scope: !37)
!45 = !DILocation(line: 0, scope: !37)
!48 = !DILocation(line: 20, column: 1, scope: !11)
!49 = !DISubprogram(name: "operator*", linkageName: "_Zml1aRf", scope: !3, file: !3, line: 2, type: !50, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !4)
!50 = !DISubroutineType(types: !51)
!51 = !{null, !19, !52}
!52 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !23, size: 64)
!1000 = !{i32 7, !"debug-info-assignment-tracking", i1 true}
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