From 5be203ec4db575302fd287ca5dbf5f4ce18ea609 Mon Sep 17 00:00:00 2001
From: Florian Hahn <flo@fhahn.com>
Date: Thu, 22 Sep 2022 08:49:56 +0100
Subject: [PATCH] [llvm-reduce] Add test with debug nodes not being removed.

Add a test where llvm-reduce at the moment cannot drop unneeded debug
metadata nodes referenced by DICompileUnit and DISubpgoram.
---
 .../tools/llvm-reduce/remove-debug-info-nodes.ll   | 63 ++++++++++++++++++++++
 1 file changed, 63 insertions(+)
 create mode 100644 llvm/test/tools/llvm-reduce/remove-debug-info-nodes.ll

diff --git a/llvm/test/tools/llvm-reduce/remove-debug-info-nodes.ll b/llvm/test/tools/llvm-reduce/remove-debug-info-nodes.ll
new file mode 100644
index 0000000..1863d35d
--- /dev/null
+++ b/llvm/test/tools/llvm-reduce/remove-debug-info-nodes.ll
@@ -0,0 +1,63 @@
+; Test that llvm-reduce can drop unneeded debug metadata nodes referenced by
+; DICompileUnit and DISuprogram.
+;
+; RUN: llvm-reduce --delta-passes=metadata --test FileCheck --test-arg --check-prefixes=CHECK-INTERESTINGNESS --test-arg %s --test-arg --input-file %s -o %t
+; RUN: cat %t | FileCheck %s
+
+; CHECK-INTERESTINGNESS: define void @test() !dbg
+; CHECK-INTERESTINGNESS: !llvm.module.flags = !{
+
+; CHECK-INTERESTINGNESS: !llvm.dbg.cu = !{[[CU:.+]]}
+
+; CHECK-INTERESTINGNESS-DAG: [[CU]] = distinct !DICompileUnit(language: DW_LANG_C99,{{.*}}, retainedTypes: [[TYPES:![0-9]+]]
+; CHECK-INTERESTINGNESS-DAG: [[TYPES]] = !{[[T0:![0-9]+]]
+; CHECK-INTERESTINGNESS-DAG: [[T0]] = !DIBasicType(name: "unsigned int",
+
+
+
+; CHECK: define void @test() !dbg [[SUBPROG:![0-9]+]]
+; CHECK: !llvm.module.flags = !{
+
+; CHECK: !llvm.dbg.cu = !{[[CU:.+]]}
+
+; CHECK-DAG: [[CU]] = distinct !DICompileUnit(language: DW_LANG_C99,{{.*}}, retainedTypes: [[TYPES:![0-9]+]], globals: [[GLOBALS:![0-9]+]]
+; CHECK-DAG: [[TYPES]] = !{[[T0:![0-9]+]]
+; CHECK-DAG: [[T0]] = !DIBasicType(name: "unsigned int",
+; CHECK-DAG: [[GLOBALS]] = !{!{{.+}}
+
+
+; CHECK-DAG: [[SUBPROG]] = distinct !DISubprogram(name: "test", {{.*}}retainedNodes: [[RETAINED_NODES:.+]])
+; CHECK-DAG: [[RETAINED_NODES]] = !{!{{.+}},
+
+define void @test() !dbg !17 {
+  ret void
+}
+
+!llvm.module.flags = !{!0, !1}
+!llvm.dbg.cu = !{!2}
+
+!0 = !{i32 7, !"Dwarf Version", i32 4}
+!1 = !{i32 2, !"Debug Info Version", i32 3}
+!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 16.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !12, globals: !14, splitDebugInlining: false, nameTableKind: None, sysroot: "/", sdk: "SDK")
+!3 = !DIFile(filename: "test.c", directory: "/tmp")
+!4 = !{!5}
+!5 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !6, line: 755, baseType: !7, size: 32, elements: !8)
+!6 = !DIFile(filename: "foo.h", directory: "/tmp")
+!7 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
+!8 = !{!9, !10, !11}
+!9 = !DIEnumerator(name: "flag_AUTO", value: 0)
+!10 = !DIEnumerator(name: "flag_STDIN", value: 1)
+!11 = !DIEnumerator(name: "flag_INTERACTIVE", value: 2)
+!12 = !{!7, !13}
+!13 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_unsigned)
+!14 = !{!15}
+!15 = !DIGlobalVariableExpression(var: !16, expr: !DIExpression())
+!16 = distinct !DIGlobalVariable(scope: null, file: !3, line: 726, type: !13, isLocal: true, isDefinition: true)
+!17 = distinct !DISubprogram(name: "test", scope: !18, file: !18, line: 1839, type: !19, scopeLine: 1846, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !21)
+!18 = !DIFile(filename: "bar.c", directory: "/tmp")
+!19 = !DISubroutineType(types: !20)
+!20 = !{null, !7}
+!21 = !{!22, !23, !24}
+!22 = !DILocalVariable(name: "A", arg: 1, scope: !17, file: !18, line: 1839, type: !7)
+!23 = !DILocalVariable(name: "B", arg: 2, scope: !17, file: !18, line: 1839, type: !7)
+!24 = !DILocalVariable(name: "C", scope: !17, file: !18, line: 1847, type: !7)
-- 
2.7.4