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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
49 lines
1.9 KiB
LLVM
49 lines
1.9 KiB
LLVM
; RUN: opt -inline -S < %s | FileCheck %s
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; Make sure the inliner doesn't crash when a metadata-bridged SSA operand is an
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; undominated use.
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;
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; If we ever add a verifier check to prevent the scenario in this file, it's
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; fine to delete this testcase. However, we would need a bitcode upgrade since
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; such historical IR exists in practice.
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define i32 @foo(i32 %i) !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %add, i64 0, metadata !8, metadata !10), !dbg !11
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%add = add nsw i32 1, %i, !dbg !12
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ret i32 %add, !dbg !13
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}
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; CHECK-LABEL: define i32 @caller(
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define i32 @caller(i32 %i) {
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; CHECK-NEXT: entry:
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entry:
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; Although the inliner shouldn't crash, it can't be expected to get the
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; "correct" SSA value since its assumptions have been violated.
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; CHECK-NEXT: tail call void @llvm.dbg.value(metadata ![[EMPTY:[0-9]+]],
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; CHECK-NEXT: %{{.*}} = add nsw
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%call = tail call i32 @foo(i32 %i)
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ret i32 %call
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}
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 (trunk 265634) (llvm/trunk 265637)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.c", directory: "/path/to/tests")
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; CHECK: ![[EMPTY]] = !{}
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 2, type: !5, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7, !7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DILocalVariable(name: "add", arg: 1, scope: !4, file: !1, line: 2, type: !7)
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !DIExpression()
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!11 = !DILocation(line: 2, column: 13, scope: !4)
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!12 = !DILocation(line: 2, column: 27, scope: !4)
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!13 = !DILocation(line: 2, column: 18, scope: !4)
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