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fb3abba237
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
70 lines
2.7 KiB
LLVM
70 lines
2.7 KiB
LLVM
; RUN: opt < %s -inline -S | FileCheck %s
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; This was generated from the following source:
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; int a, b;
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; __attribute__((__always_inline__)) static void callee2() { b = 2; }
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; __attribute__((__nodebug__)) void callee() { a = 1; callee2(); }
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; void caller() { callee(); }
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; by running
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; clang -S test.c -emit-llvm -O1 -gline-tables-only -fno-strict-aliasing
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; CHECK-LABEL: @caller(
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; This instruction did not have a !dbg metadata in the callee.
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; CHECK: store i32 1, {{.*}}, !dbg [[A:!.*]]
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; This instruction came from callee with a !dbg metadata.
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; CHECK: store i32 2, {{.*}}, !dbg [[B:!.*]]
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; The remaining instruction from the caller.
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; CHECK: ret void, !dbg [[A]]
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; Debug location of the code in caller() and of the inlined code that did not
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; have any debug location before.
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; CHECK-DAG: [[A]] = !DILocation(line: 4, scope: !{{[0-9]+}})
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; Debug location of the inlined code.
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; CHECK-DAG: [[B]] = !DILocation(line: 2, scope: !{{[0-9]+}}, inlinedAt: [[A_INL:![0-9]*]])
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; CHECK-DAG: [[A_INL]] = distinct !DILocation(line: 4, scope: !{{[0-9]+}})
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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@a = common global i32 0, align 4
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@b = common global i32 0, align 4
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; Function Attrs: nounwind uwtable
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define void @callee() #0 {
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entry:
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store i32 1, i32* @a, align 4
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store i32 2, i32* @b, align 4, !dbg !11
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ret void
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}
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; Function Attrs: nounwind uwtable
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define void @caller() #0 !dbg !4 {
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entry:
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tail call void @callee(), !dbg !12
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ret void, !dbg !12
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}
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attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 (210174)", isOptimized: true, emissionKind: LineTablesOnly, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "test.c", directory: "/code/llvm/build0")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "caller", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !0, scopeLine: 4, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "test.c", directory: "/code/llvm/build0")
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!6 = !DISubroutineType(types: !2)
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!7 = distinct !DISubprogram(name: "callee2", line: 2, isLocal: true, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !0, scopeLine: 2, file: !1, scope: !5, type: !6, variables: !2)
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{!"clang version 3.5.0 (210174)"}
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!11 = !DILocation(line: 2, scope: !7)
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!12 = !DILocation(line: 4, scope: !4)
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