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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
44 lines
1.5 KiB
LLVM
44 lines
1.5 KiB
LLVM
; RUN: llc -mtriple=armv7-linux-gnueabihf %s -o - | FileCheck %s
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; Generated from:
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; void stack_offsets() {
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; asm("" ::: "d8", "d9", "d11", "d13");
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; }
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; Compiled with: "clang -target armv7-linux-gnueabihf -O3"
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; The important point we're checking here is that the .cfi directives describe
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; the layout of the VFP registers correctly. The fact that the numbers are
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; monotonic in memory is also a nice property to have.
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define void @stack_offsets() !dbg !4 {
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; CHECK-LABEL: stack_offsets:
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; CHECK: vpush {d13}
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; CHECK: vpush {d11}
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; CHECK: vpush {d8, d9}
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; CHECK: .cfi_offset {{269|d13}}, -8
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; CHECK: .cfi_offset {{267|d11}}, -16
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; CHECK: .cfi_offset {{265|d9}}, -24
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; CHECK: .cfi_offset {{264|d8}}, -32
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; CHECK: vpop {d8, d9}
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; CHECK: vpop {d11}
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; CHECK: vpop {d13}
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call void asm sideeffect "", "~{d8},~{d9},~{d11},~{d13}"() #1
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ret void
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "tmp.c", directory: "/Users/tim/llvm/build")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "bar", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !2)
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!5 = !DIFile(filename: "tmp.c", directory: "/Users/tim/llvm/build")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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!9 = !{i32 1, !"Debug Info Version", i32 3}
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