75819aedf6
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
82 lines
3.4 KiB
LLVM
82 lines
3.4 KiB
LLVM
; RUN: opt < %s -sample-profile -sample-profile-file=%S/Inputs/offset.prof | opt -analyze -branch-prob | FileCheck %s
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; Original C++ code for this test case:
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;
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; a.cc:
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; #1
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; #2
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; #3
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; #4
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; #5 int foo(int a) {
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; #6 #include "a.b"
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; #7}
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;
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; a.b:
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; #1 if (a > 0) {
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; #2 return 10;
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; #3 } else {
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; #4 return 20;
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; #5 }
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; Function Attrs: nounwind uwtable
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define i32 @_Z3fooi(i32 %a) #0 !dbg !4 {
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entry:
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%retval = alloca i32, align 4
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%a.addr = alloca i32, align 4
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store i32 %a, i32* %a.addr, align 4
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call void @llvm.dbg.declare(metadata i32* %a.addr, metadata !11, metadata !12), !dbg !13
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%0 = load i32, i32* %a.addr, align 4, !dbg !14
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%cmp = icmp sgt i32 %0, 0, !dbg !18
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br i1 %cmp, label %if.then, label %if.else, !dbg !19
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; CHECK: edge entry -> if.then probability is 0x0147ae14 / 0x80000000 = 1.00%
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; CHECK: edge entry -> if.else probability is 0x7eb851ec / 0x80000000 = 99.00% [HOT edge]
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if.then: ; preds = %entry
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store i32 10, i32* %retval, align 4, !dbg !20
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br label %return, !dbg !20
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if.else: ; preds = %entry
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store i32 20, i32* %retval, align 4, !dbg !22
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br label %return, !dbg !22
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return: ; preds = %if.else, %if.then
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%1 = load i32, i32* %retval, align 4, !dbg !24
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ret i32 %1, !dbg !24
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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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 3.8.0 (trunk 250750)", isOptimized: false, runtimeVersion: 0, emissionKind: NoDebug, enums: !2)
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!1 = !DIFile(filename: "a.cc", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooi", scope: !1, file: !1, line: 5, type: !5, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7, !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 3.8.0 (trunk 250750)"}
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!11 = !DILocalVariable(name: "a", arg: 1, scope: !4, file: !1, line: 5, type: !7)
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!12 = !DIExpression()
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!13 = !DILocation(line: 5, column: 13, scope: !4)
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!14 = !DILocation(line: 1, column: 5, scope: !15)
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!15 = distinct !DILexicalBlock(scope: !17, file: !16, line: 1, column: 5)
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!16 = !DIFile(filename: "./a.b", directory: "/tmp")
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!17 = !DILexicalBlockFile(scope: !4, file: !16, discriminator: 0)
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!18 = !DILocation(line: 1, column: 7, scope: !15)
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!19 = !DILocation(line: 1, column: 5, scope: !17)
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!20 = !DILocation(line: 2, column: 3, scope: !21)
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!21 = distinct !DILexicalBlock(scope: !15, file: !16, line: 1, column: 12)
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!22 = !DILocation(line: 4, column: 3, scope: !23)
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!23 = distinct !DILexicalBlock(scope: !15, file: !16, line: 3, column: 8)
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!24 = !DILocation(line: 7, column: 1, scope: !25)
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!25 = !DILexicalBlockFile(scope: !4, file: !1, discriminator: 0)
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