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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
52 lines
2.2 KiB
LLVM
52 lines
2.2 KiB
LLVM
; RUN: llc -mtriple thumbv7--windows-itanium -filetype obj -o - %s \
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; RUN: | llvm-readobj -r - | FileCheck %s -check-prefix CHECK-ITANIUM
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; RUN: sed -e 's/"Dwarf Version"/"CodeView"/' %s \
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; RUN: | llc -mtriple thumbv7--windows-msvc -filetype obj -o - \
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; RUN: | llvm-readobj -r - | FileCheck %s -check-prefix CHECK-MSVC
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; ModuleID = '/Users/compnerd/work/llvm/test/MC/ARM/reduced.c'
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target datalayout = "e-m:e-p:32:32-i1:8:32-i8:8:32-i16:16:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7--windows-itanium"
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define arm_aapcs_vfpcc void @function() !dbg !1 {
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entry:
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ret void, !dbg !0
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}
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!llvm.dbg.cu = !{!7}
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!llvm.module.flags = !{!9, !10}
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!0 = !DILocation(line: 1, scope: !1)
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!1 = distinct !DISubprogram(name: "function", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: false, unit: !7, scopeLine: 1, file: !2, scope: !3, type: !4, variables: !6)
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!2 = !DIFile(filename: "/Users/compnerd/work/llvm/test/MC/ARM/reduced.c", directory: "/Users/compnerd/work/llvm")
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!3 = !DIFile(filename: "/Users/compnerd/work/llvm/test/MC/ARM/reduced.c", directory: "/Users/compnerd/work/llvm")
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!4 = !DISubroutineType(types: !5)
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!5 = !{null}
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!6 = !{}
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!7 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0", isOptimized: false, emissionKind: FullDebug, file: !2, enums: !6, retainedTypes: !6, globals: !6, imports: !6)
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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; CHECK-ITANIUM: Relocations [
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; CHECK-ITANIUM: Section {{.*}} .debug_info {
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; CHECK-ITANIUM: 0x6 IMAGE_REL_ARM_SECREL .debug_abbrev
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; CHECK-ITANIUM: 0xC IMAGE_REL_ARM_SECREL .debug_str
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; CHECK-ITANIUM: 0x12 IMAGE_REL_ARM_SECREL .debug_str
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; CHECK-ITANIUM: 0x16 IMAGE_REL_ARM_SECREL .debug_line
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; CHECK-ITANIUM: }
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; CHECK-ITANIUM: Section {{.*}}.debug_pubnames {
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; CHECK-ITANIUM: 0x6 IMAGE_REL_ARM_SECREL .debug_info
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; CHECK-ITANIUM: }
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; CHECK-ITANIUM: ]
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; CHECK-MSVC: Relocations [
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; CHECK-MSVC: Section {{.*}} .debug$S {
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; CHECK-MSVC: 0x2C IMAGE_REL_ARM_SECREL function
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; CHECK-MSVC: 0x30 IMAGE_REL_ARM_SECTION function
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; CHECK-MSVC: 0x48 IMAGE_REL_ARM_SECREL function
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; CHECK-MSVC: 0x4C IMAGE_REL_ARM_SECTION function
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; CHECK-MSVC: }
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; CHECK-MSVC: ]
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