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llvm-mirror/test/DebugInfo/COFF/comdat.ll
Reid Kleckner 607aa67b5e [codeview] Use comdats for debug info describing comdat functions 
Summary:
This allows the linker to discard unused symbol information for comdat
functions that were discarded during the link. Before this change,
searching for the name of an inline function in the debugger would
return multiple results, one per symbol subsection in the object file.
After this change, there is only one result, the result for the function
chosen by the linker.

Reviewers: zturner, majnemer

Subscribers: aaboud, amccarth, llvm-commits

Differential Revision: http://reviews.llvm.org/D20642

llvm-svn: 270792
2016-05-25 23:16:12 +00:00

197 lines
9.1 KiB
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; RUN: llc < %s | FileCheck %s
; Verify that we get *two* .debug$S sections, the main one describing bar and
; main, and one for f and fin$f, which is comdat with f.
; Start in the main symbol section describing bar and main.
; CHECK: .section .debug$S,"dr"{{$}}
; CHECK: .long 4 # Debug section magic
; CHECK: # Symbol subsection for bar
; CHECK-NOT: Debug section magic
; CHECK: # Symbol subsection for main
; Emit symbol info for f and its associated code in a separate associated
; section.
; CHECK: .section .debug$S,"dr",associative,f{{$}}
; CHECK: .long 4 # Debug section magic
; CHECK: # Symbol subsection for f
; CHECK-NOT: Debug section magic
; CHECK: # Symbol subsection for ?fin$0@0@f@@
; Switch back to the main section for the shared file checksum table and string
; table.
; CHECK: .section .debug$S,"dr"{{$}}
; CHECK-NOT: Debug section magic
; CHECK: .cv_filechecksums
; CHECK: .cv_stringtable
; CHECK-NOT: .section .debug$S,
; Generated with this C++ source:
; void foo();
; void bar();
; extern volatile int x;
; inline void __declspec(noinline) f(bool c) {
; x++;
; if (c) {
; __try {
; foo();
; } __finally {
; x++;
; }
; } else
; bar();
; x++;
; }
; void bar() {
; x++;
; }
; int main() {
; f(true);
; }
; ModuleID = 't.cpp'
source_filename = "t.cpp"
target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-pc-windows-msvc19.0.23918"
$f = comdat any
@x = external global i32, align 4
; Function Attrs: norecurse nounwind uwtable
define void @bar() #0 !dbg !7 {
entry:
%0 = load volatile i32, i32* @x, align 4, !dbg !10, !tbaa !11
%inc = add nsw i32 %0, 1, !dbg !10
store volatile i32 %inc, i32* @x, align 4, !dbg !10, !tbaa !11
ret void, !dbg !15
}
; Function Attrs: nounwind uwtable
define i32 @main() #1 !dbg !16 {
entry:
tail call void @f(i32 1), !dbg !20
ret i32 0, !dbg !21
}
; Function Attrs: inlinehint noinline nounwind uwtable
define linkonce_odr void @f(i32 %c) #2 comdat personality i8* bitcast (i32 (...)* @__C_specific_handler to i8*) !dbg !22 {
entry:
tail call void @llvm.dbg.value(metadata i32 %c, i64 0, metadata !26, metadata !27), !dbg !28
%0 = load volatile i32, i32* @x, align 4, !dbg !29, !tbaa !11
%inc = add nsw i32 %0, 1, !dbg !29
store volatile i32 %inc, i32* @x, align 4, !dbg !29, !tbaa !11
%tobool = icmp eq i32 %c, 0, !dbg !30
br i1 %tobool, label %if.else, label %if.then, !dbg !32
if.then: ; preds = %entry
invoke void bitcast (void (...)* @foo to void ()*)() #6
to label %invoke.cont unwind label %ehcleanup, !dbg !33
invoke.cont: ; preds = %if.then
tail call fastcc void @"\01?fin$0@0@f@@"() #7, !dbg !36
br label %if.end, !dbg !37
ehcleanup: ; preds = %if.then
%1 = cleanuppad within none [], !dbg !36
tail call fastcc void @"\01?fin$0@0@f@@"() #7 [ "funclet"(token %1) ], !dbg !36
cleanupret from %1 unwind to caller, !dbg !36
if.else: ; preds = %entry
tail call void @bar(), !dbg !38
br label %if.end
if.end: ; preds = %if.else, %invoke.cont
%2 = load volatile i32, i32* @x, align 4, !dbg !39, !tbaa !11
%inc1 = add nsw i32 %2, 1, !dbg !39
store volatile i32 %inc1, i32* @x, align 4, !dbg !39, !tbaa !11
ret void, !dbg !40
}
; Function Attrs: nounwind
define internal fastcc void @"\01?fin$0@0@f@@"() unnamed_addr #3 comdat($f) !dbg !41 {
entry:
tail call void @llvm.dbg.value(metadata i8* null, i64 0, metadata !44, metadata !27), !dbg !48
tail call void @llvm.dbg.value(metadata i8 0, i64 0, metadata !46, metadata !27), !dbg !48
%0 = load volatile i32, i32* @x, align 4, !dbg !49, !tbaa !11
%inc = add nsw i32 %0, 1, !dbg !49
store volatile i32 %inc, i32* @x, align 4, !dbg !49, !tbaa !11
ret void, !dbg !51
}
declare void @foo(...) #4
declare i32 @__C_specific_handler(...)
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #5
attributes #0 = { norecurse nounwind 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" }
attributes #1 = { nounwind 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" }
attributes #2 = { inlinehint noinline nounwind 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" }
attributes #3 = { nounwind "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" }
attributes #4 = { "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" }
attributes #5 = { nounwind readnone }
attributes #6 = { noinline }
attributes #7 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.9.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "t.cpp", directory: "D:\5Csrc\5Cllvm\5Cbuild")
!2 = !{}
!3 = !{i32 2, !"CodeView", i32 1}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"PIC Level", i32 2}
!6 = !{!"clang version 3.9.0 "}
!7 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 19, type: !8, isLocal: false, isDefinition: true, scopeLine: 19, isOptimized: true, unit: !0, variables: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{null}
!10 = !DILocation(line: 20, column: 4, scope: !7)
!11 = !{!12, !12, i64 0}
!12 = !{!"int", !13, i64 0}
!13 = !{!"omnipotent char", !14, i64 0}
!14 = !{!"Simple C/C++ TBAA"}
!15 = !DILocation(line: 21, column: 1, scope: !7)
!16 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 22, type: !17, isLocal: false, isDefinition: true, scopeLine: 22, isOptimized: true, unit: !0, variables: !2)
!17 = !DISubroutineType(types: !18)
!18 = !{!19}
!19 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!20 = !DILocation(line: 23, column: 3, scope: !16)
!21 = !DILocation(line: 24, column: 1, scope: !16)
!22 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 5, type: !23, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !25)
!23 = !DISubroutineType(types: !24)
!24 = !{null, !19}
!25 = !{!26}
!26 = !DILocalVariable(name: "c", arg: 1, scope: !22, file: !1, line: 5, type: !19)
!27 = !DIExpression()
!28 = !DILocation(line: 5, column: 40, scope: !22)
!29 = !DILocation(line: 6, column: 4, scope: !22)
!30 = !DILocation(line: 7, column: 7, scope: !31)
!31 = distinct !DILexicalBlock(scope: !22, file: !1, line: 7, column: 7)
!32 = !DILocation(line: 7, column: 7, scope: !22)
!33 = !DILocation(line: 9, column: 7, scope: !34)
!34 = distinct !DILexicalBlock(scope: !35, file: !1, line: 8, column: 11)
!35 = distinct !DILexicalBlock(scope: !31, file: !1, line: 7, column: 10)
!36 = !DILocation(line: 10, column: 5, scope: !34)
!37 = !DILocation(line: 13, column: 3, scope: !35)
!38 = !DILocation(line: 14, column: 5, scope: !31)
!39 = !DILocation(line: 15, column: 4, scope: !22)
!40 = !DILocation(line: 16, column: 1, scope: !22)
!41 = distinct !DISubprogram(linkageName: "\01?fin$0@0@f@@", scope: !1, file: !1, line: 10, type: !42, isLocal: true, isDefinition: true, scopeLine: 10, flags: DIFlagArtificial, isOptimized: true, unit: !0, variables: !43)
!42 = !DISubroutineType(types: !2)
!43 = !{!44, !46}
!44 = !DILocalVariable(name: "frame_pointer", arg: 2, scope: !41, type: !45, flags: DIFlagArtificial)
!45 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64, align: 64)
!46 = !DILocalVariable(name: "abnormal_termination", arg: 1, scope: !41, type: !47, flags: DIFlagArtificial | DIFlagObjectPointer)
!47 = !DIBasicType(name: "unsigned char", size: 8, align: 8, encoding: DW_ATE_unsigned_char)
!48 = !DILocation(line: 0, scope: !41)
!49 = !DILocation(line: 11, column: 8, scope: !50)
!50 = distinct !DILexicalBlock(scope: !41, file: !1, line: 10, column: 17)
!51 = !DILocation(line: 12, column: 5, scope: !41)
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