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Currently each Function points to a DISubprogram and DISubprogram has a scope field. For member functions the scope is a DICompositeType. DIScopes point to the DICompileUnit to facilitate type uniquing. Distinct DISubprograms (with isDefinition: true) are not part of the type hierarchy and cannot be uniqued. This change removes the subprograms list from DICompileUnit and instead adds a pointer to the owning compile unit to distinct DISubprograms. This would make it easy for ThinLTO to strip unneeded DISubprograms and their transitively referenced debug info. Motivation ---------- Materializing DISubprograms is currently the most expensive operation when doing a ThinLTO build of clang. We want the DISubprogram to be stored in a separate Bitcode block (or the same block as the function body) so we can avoid having to expensively deserialize all DISubprograms together with the global metadata. If a function has been inlined into another subprogram we need to store a reference the block containing the inlined subprogram. Attached to https://llvm.org/bugs/show_bug.cgi?id=27284 is a python script that updates LLVM IR testcases to the new format. http://reviews.llvm.org/D19034 <rdar://problem/25256815> llvm-svn: 266446
42 lines
1.4 KiB
LLVM
42 lines
1.4 KiB
LLVM
; RUN: llc -disable-fp-elim -O0 %s -mtriple s390x-linux-gnu -o - | FileCheck %s
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; int func(void);
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; void prologue_end_test() {
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; func();
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; func();
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; }
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define void @prologue_end_test() nounwind uwtable !dbg !4 {
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; CHECK: prologue_end_test:
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; CHECK: .cfi_startproc
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; CHECK: aghi
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; CHECK: lgr
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; CHECK: .loc 1 3 3 prologue_end
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; CHECK: brasl {{.*}}, func
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; CHECK: brasl {{.*}}, func
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entry:
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%call = call i32 @func(), !dbg !11
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%call1 = call i32 @func(), !dbg !12
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ret void, !dbg !13
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}
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declare i32 @func()
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (trunk 242129)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "foo.c", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "prologue_end_test", scope: !1, file: !1, line: 2, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: false, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{i32 2, !"Dwarf Version", i32 2}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"PIC Level", i32 2}
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!10 = !{!"clang version 3.7.0 (trunk 242129)"}
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!11 = !DILocation(line: 3, column: 3, scope: !4)
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!12 = !DILocation(line: 4, column: 3, scope: !4)
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!13 = !DILocation(line: 5, column: 1, scope: !4)
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