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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
65 lines
1.7 KiB
LLVM
65 lines
1.7 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin %s -o - -filetype=asm | FileCheck %s
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; Generated from:
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; asm(
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; ".file 1 \"A.asm\"\n"
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; ".file 2 \"B.asm\"\n"
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; ".loc 1 111\n"
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; ".text\n"
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; ".globl _bar\n"
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; "_bar:\n"
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; ".loc 2 222\n"
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; "\tret\n"
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; );
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;
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; void bar();
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;
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; void foo() {
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; bar();
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; }
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; CHECK: .file 1 "A.asm"
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; CHECK: .file 2 "B.asm"
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; CHECK: .loc 1 111
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; CHECK: .loc 2 222
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; CHECK: .file 3 "test.c"
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; CHECK: .loc 3 14 0
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx"
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module asm ".file 1 \22A.asm\22"
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module asm ".file 2 \22B.asm\22"
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module asm ".loc 1 111"
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module asm ".text"
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module asm ".globl _bar"
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module asm "_bar:"
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module asm ".loc 2 222"
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module asm "\09ret"
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; Function Attrs: nounwind ssp uwtable
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define void @foo() !dbg !4 {
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entry:
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call void (...) @bar(), !dbg !11
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ret void, !dbg !12
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}
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declare void @bar(...)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.0 (trunk 256963)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.c", directory: "/Volumes/Data/radar/22690666")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 14, type: !5, isLocal: false, isDefinition: true, scopeLine: 14, isOptimized: false, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = !{i32 2, !"Dwarf Version", i32 2}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"PIC Level", i32 2}
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!10 = !{!"clang version 3.8.0 (trunk 256963)"}
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!11 = !DILocation(line: 15, column: 3, scope: !4)
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!12 = !DILocation(line: 16, column: 1, scope: !4)
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