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1; RUN: opt -run-twice -passes=verify -S -o - %s | FileCheck %s2 3; If a module contains a DISubprogram referenced only indirectly from4; instruction-level debug info metadata, but not attached to any Function5; defined within the module, cloning such a module with CloneModule was6; causing a DICompileUnit duplication: it would be moved in indirecty via a7; DISubprogram by DebugInfoFinder (making sure DISubprogram's don't get8; duplicated) first without being explicitly self-mapped within the ValueMap9; shared among CloneFunctionInto calls, and then it would get copied during10; named metadata cloning.11;12; This is to make sure we don't regress on that.13 14; Derived from the following C-snippet15;16; static int eliminated(int j);17; __attribute__((nodebug)) int nodebug(int k) { return eliminated(k); }18; __attribute__((always_inline)) static int eliminated(int j) { return j * 2; }19;20; compiled with `clang -O1 -g1 -emit-llvm -S`21 22; CHECK: DICompileUnit23; CHECK-NOT: DICompileUnit24 25source_filename = "clone-module.c"26target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"27target triple = "x86_64-apple-macosx"28 29; Function Attrs: norecurse nounwind readnone ssp uwtable30define i32 @nodebug(i32 %k) local_unnamed_addr #0 {31entry:32 %mul.i = shl nsw i32 %k, 1, !dbg !833 ret i32 %mul.i34}35 36attributes #0 = { norecurse nounwind readnone ssp uwtable }37 38!llvm.dbg.cu = !{!0}39!llvm.module.flags = !{!3, !4, !5, !6}40!llvm.ident = !{!7}41 42!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 7.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: LineTablesOnly, enums: !2)43!1 = !DIFile(filename: "test.c", directory: "/Volumes/Data/llvm/build/obj")44!2 = !{}45!3 = !{i32 2, !"Dwarf Version", i32 4}46!4 = !{i32 2, !"Debug Info Version", i32 3}47!5 = !{i32 1, !"wchar_size", i32 4}48!6 = !{i32 7, !"PIC Level", i32 2}49!7 = !{!"clang version 7.0.0"}50!8 = !DILocation(line: 3, column: 72, scope: !9)51!9 = distinct !DISubprogram(name: "eliminated", scope: !1, file: !1, line: 3, type: !10, isLocal: true, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !2)52!10 = !DISubroutineType(types: !2)53