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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
37 lines
1.1 KiB
LLVM
37 lines
1.1 KiB
LLVM
; RUN: llvm-as < %s | llvm-bcanalyzer -dump | FileCheck %s -check-prefix=BC
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; PR23436: Actually emit DEBUG_LOC_AGAIN records.
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; BC: <DEBUG_LOC op
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; BC: <DEBUG_LOC_AGAIN/>
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; BC: <DEBUG_LOC op
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; BC: <DEBUG_LOC_AGAIN/>
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; RUN: llvm-as < %s | llvm-dis | FileCheck %s
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; RUN: verify-uselistorder %s
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; Check that this round-trips correctly.
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define void @foo() {
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entry:
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%a = add i32 0, 0, !dbg !3
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%b = add i32 0, 1, !dbg !3
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%c = add i32 0, 2, !dbg !4
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ret void, !dbg !4
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}
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; CHECK-LABEL: entry:
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; CHECK-NEXT: %a = add i32 0, 0, !dbg ![[LINE1:[0-9]+]]
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; CHECK-NEXT: %b = add i32 0, 1, !dbg ![[LINE1]]
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; CHECK-NEXT: %c = add i32 0, 2, !dbg ![[LINE2:[0-9]+]]
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; CHECK-NEXT: ret void, !dbg ![[LINE2]]
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; CHECK: ![[LINE1]] = !DILocation(line: 1,
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; CHECK: ![[LINE2]] = !DILocation(line: 2,
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!llvm.module.flags = !{!0}
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!llvm.dbg.cu = !{!1}
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!0 = !{i32 2, !"Debug Info Version", i32 3}
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !DIFile(filename: "f", directory: "/d"))
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!2 = distinct !DISubprogram(name: "foo", unit: !1)
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!3 = !DILocation(line: 1, scope: !2)
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!4 = !DILocation(line: 2, scope: !2)
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