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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
50 lines
2.5 KiB
LLVM
50 lines
2.5 KiB
LLVM
; RUN: opt < %s -add-discriminators -S | FileCheck %s
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; Discriminator support for calls that are defined in one line:
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; #1 int foo(int, int);
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; #2 int bar();
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; #3 int baz() {
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; #4 return foo(bar(),
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; #5 bar());
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; #6 }
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; Function Attrs: uwtable
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define i32 @_Z3bazv() #0 !dbg !4 {
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%1 = call i32 @_Z3barv(), !dbg !11
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; CHECK: %1 = call i32 @_Z3barv(), !dbg ![[CALL0:[0-9]+]]
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%2 = call i32 @_Z3barv(), !dbg !12
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; CHECK: %2 = call i32 @_Z3barv(), !dbg ![[CALL1:[0-9]+]]
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%3 = call i32 @_Z3fooii(i32 %1, i32 %2), !dbg !13
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; CHECK: %3 = call i32 @_Z3fooii(i32 %1, i32 %2), !dbg ![[CALL2:[0-9]+]]
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ret i32 %3, !dbg !14
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}
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declare i32 @_Z3fooii(i32, i32) #1
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declare i32 @_Z3barv() #1
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attributes #0 = { uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2,+x87" "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_C_plus_plus, file: !1, producer: "clang version 3.9.0 (trunk 266269)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.cc", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "baz", linkageName: "_Z3bazv", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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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 3.9.0 (trunk 266269)"}
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!11 = !DILocation(line: 4, column: 14, scope: !4)
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!12 = !DILocation(line: 5, column: 14, scope: !4)
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!13 = !DILocation(line: 4, column: 10, scope: !4)
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!14 = !DILocation(line: 4, column: 3, scope: !4)
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; CHECK: ![[CALL2]] = !DILocation(line: 4, column: 10, scope: ![[CALL2BLOCK:[0-9]+]])
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; CHECK: ![[CALL2BLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 1)
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