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llvm-mirror/test/DebugInfo/COFF/comdat.ll
Shiva Chen a2029fa58e [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
2018-05-09 02:40:45 +00:00

197 lines
9.0 KiB
LLVM
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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, 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, metadata !44, metadata !27), !dbg !48
tail call void @llvm.dbg.value(metadata i8 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, 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, retainedNodes: !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, retainedNodes: !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, retainedNodes: !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, retainedNodes: !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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