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llvm-mirror/test/CodeGen/ARM/coalesce-dbgvalue.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

116 lines
5.8 KiB
LLVM
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; RUN: llc < %s -verify-machineinstrs
; PR16110
;
; This test case contains a value that is split into two connected components
; by rematerialization during coalescing. It also contains a DBG_VALUE
; instruction which must be updated during
; ConnectedVNInfoEqClasses::Distribute().
source_filename = "test/CodeGen/ARM/coalesce-dbgvalue.ll"
target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:32:64-v128:32:128-a0:0:32-n32-S32"
target triple = "thumbv7-apple-ios3.0.0"
@c = common global i32 0, align 4, !dbg !0
@b = common global i32 0, align 4, !dbg !4
@a = common global i64 0, align 8, !dbg !6
@d = common global i32 0, align 4, !dbg !9
; Function Attrs: nounwind ssp
define i32 @pr16110() #0 !dbg !15 {
for.cond1.preheader:
store i32 0, i32* @c, align 4, !dbg !24
br label %for.cond1.outer, !dbg !26
for.cond1: ; preds = %for.end9, %for.cond1.outer
%storemerge11 = phi i32 [ 0, %for.end9 ], [ %storemerge11.ph, %for.cond1.outer ]
%cmp = icmp slt i32 %storemerge11, 1, !dbg !26
br i1 %cmp, label %for.body2, label %for.end9, !dbg !26
for.body2: ; preds = %for.cond1
store i32 %storemerge11, i32* @b, align 4, !dbg !26
tail call void @llvm.dbg.value(metadata i32* null, metadata !20, metadata !27), !dbg !28
%0 = load i64, i64* @a, align 8, !dbg !29
%xor = xor i64 %0, %e.1.ph, !dbg !29
%conv3 = trunc i64 %xor to i32, !dbg !29
tail call void @llvm.dbg.value(metadata i32 %conv3, metadata !19, metadata !27), !dbg !29
%tobool4 = icmp eq i32 %conv3, 0, !dbg !29
br i1 %tobool4, label %land.end, label %land.rhs, !dbg !29
land.rhs: ; preds = %for.body2
%call = tail call i32 bitcast (i32 (...)* @fn3 to i32 ()*)() #3, !dbg !29
%tobool5 = icmp ne i32 %call, 0, !dbg !29
br label %land.end
land.end: ; preds = %land.rhs, %for.body2
%1 = phi i1 [ false, %for.body2 ], [ %tobool5, %land.rhs ]
%land.ext = zext i1 %1 to i32
%call6 = tail call i32 bitcast (i32 (...)* @fn2 to i32 (i32, i32*)*)(i32 %land.ext, i32* null) #3
%2 = load i32, i32* @b, align 4, !dbg !26
%inc8 = add nsw i32 %2, 1, !dbg !26
%phitmp = and i64 %xor, 4294967295, !dbg !26
br label %for.cond1.outer, !dbg !26
for.cond1.outer: ; preds = %land.end, %for.cond1.preheader
%storemerge11.ph = phi i32 [ %inc8, %land.end ], [ 0, %for.cond1.preheader ]
%e.1.ph = phi i64 [ %phitmp, %land.end ], [ 0, %for.cond1.preheader ]
%3 = load i32, i32* @d, align 4, !dbg !30
%tobool10 = icmp eq i32 %3, 0, !dbg !30
br label %for.cond1
for.end9: ; preds = %for.cond1
br i1 %tobool10, label %if.end, label %for.cond1, !dbg !30
if.end: ; preds = %for.end9
store i32 %storemerge11, i32* @b, align 4, !dbg !26
ret i32 0, !dbg !31
}
declare i32 @fn2(...) #1
declare i32 @fn3(...) #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { nounwind ssp "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { "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" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #2 = { nounwind readnone }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!11}
!llvm.module.flags = !{!14}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "c", scope: null, file: !2, line: 3, type: !3, isLocal: false, isDefinition: true)
!2 = !DIFile(filename: "pr16110.c", directory: "/d/b")
!3 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
!5 = !DIGlobalVariable(name: "b", scope: null, file: !2, line: 2, type: !3, isLocal: false, isDefinition: true)
!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
!7 = !DIGlobalVariable(name: "a", scope: null, file: !2, line: 1, type: !8, isLocal: false, isDefinition: true)
!8 = !DIBasicType(name: "long long int", size: 64, align: 32, encoding: DW_ATE_signed)
!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
!10 = !DIGlobalVariable(name: "d", scope: null, file: !2, line: 4, type: !3, isLocal: false, isDefinition: true)
!11 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 3.4 (trunk 182024) (llvm/trunk 182023)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !12, retainedTypes: !12, globals: !13, imports: !12)
!12 = !{}
!13 = !{!6, !4, !0, !9}
!14 = !{i32 1, !"Debug Info Version", i32 3}
!15 = distinct !DISubprogram(name: "pr16110", scope: !2, file: !2, line: 7, type: !16, isLocal: false, isDefinition: true, scopeLine: 7, virtualIndex: 6, isOptimized: true, unit: !11, retainedNodes: !18)
!16 = !DISubroutineType(types: !17)
!17 = !{!3}
!18 = !{!19, !20}
!19 = !DILocalVariable(name: "e", scope: !15, file: !2, line: 8, type: !3)
!20 = !DILocalVariable(name: "f", scope: !21, file: !2, line: 13, type: !23)
!21 = distinct !DILexicalBlock(scope: !22, file: !2, line: 12)
!22 = distinct !DILexicalBlock(scope: !15, file: !2, line: 12)
!23 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !3, size: 32, align: 32)
!24 = !DILocation(line: 10, scope: !25)
!25 = distinct !DILexicalBlock(scope: !15, file: !2, line: 10)
!26 = !DILocation(line: 12, scope: !22)
!27 = !DIExpression()
!28 = !DILocation(line: 13, scope: !21)
!29 = !DILocation(line: 14, scope: !21)
!30 = !DILocation(line: 16, scope: !15)
!31 = !DILocation(line: 18, scope: !15)
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