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llvm/test/DebugInfo/X86/sdag-dbgvalue-phi-use-1.ll
Shiva Chen a8a13bc662 [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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@331841 91177308-0d34-0410-b5e6-96231b3b80d8
2018-05-09 02:40:45 +00:00

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; RUN: llc -start-after=codegenprepare -stop-before expand-isel-pseudos -o - %s | FileCheck %s
; This test case was generated from the following debug.c program,
; using: clang debug.c -g -O1 -S -o dbg_value_phi_isel1.ll -emit-llvm
; --------------------------------------
; int end = 10;
;
; int main() {
; int x = 9;
; int y = 13;
; for (int u = 0; u < end; ++u) {
; x += y;
; y = y * 3;
; }
;
; volatile int arr[80];
; for (int q = 0; q < 64; ++q) {
; arr[q] = q + 3;
; }
;
; return x;
; }
; --------------------------------------
;
; ModuleID = 'debug.c'
source_filename = "debug.c"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
@end = dso_local local_unnamed_addr global i32 10, align 4, !dbg !0
; Function Attrs: nounwind uwtable
define dso_local i32 @main() local_unnamed_addr #0 !dbg !11 {
; CHECK-LABEL: name: main
entry:
%arr = alloca [80 x i32], align 16
call void @llvm.dbg.value(metadata i32 9, metadata !15, metadata !DIExpression()), !dbg !26
call void @llvm.dbg.value(metadata i32 13, metadata !16, metadata !DIExpression()), !dbg !27
call void @llvm.dbg.value(metadata i32 0, metadata !17, metadata !DIExpression()), !dbg !28
%0 = load i32, i32* @end, align 4, !dbg !29, !tbaa !31
%cmp20 = icmp sgt i32 %0, 0, !dbg !35
br i1 %cmp20, label %for.body.lr.ph, label %for.cond.cleanup, !dbg !36
for.body.lr.ph: ; preds = %entry
%1 = load i32, i32* @end, align 4, !tbaa !31
br label %for.body, !dbg !36
for.cond.cleanup: ; preds = %for.body, %entry
; CHECK-LABEL: bb.{{.*}}.for.cond.cleanup:
; CHECK: [[REG1:%[0-9]+]]:gr32 = PHI
; CHECK-NEXT: DBG_VALUE debug-use [[REG1]]
%x.0.lcssa = phi i32 [ 9, %entry ], [ %add, %for.body ]
call void @llvm.dbg.value(metadata i32 %x.0.lcssa, metadata !15, metadata !DIExpression()), !dbg !26
%2 = bitcast [80 x i32]* %arr to i8*, !dbg !37
call void @llvm.lifetime.start.p0i8(i64 320, i8* nonnull %2) #3, !dbg !37
call void @llvm.dbg.declare(metadata [80 x i32]* %arr, metadata !19, metadata !DIExpression()), !dbg !38
call void @llvm.dbg.value(metadata i32 0, metadata !24, metadata !DIExpression()), !dbg !39
br label %for.body4, !dbg !40
for.body: ; preds = %for.body.lr.ph, %for.body
; CHECK-LABEL: bb.{{.*}}.for.body:
; CHECK: [[REG2:%[0-9]+]]:gr32 = PHI
; CHECK-NEXT: [[REG3:%[0-9]+]]:gr32 = PHI
; CHECK-NEXT: [[REG4:%[0-9]+]]:gr32 = PHI
; CHECK-NEXT: DBG_VALUE debug-use [[REG2]]
; CHECK-NEXT: DBG_VALUE debug-use [[REG3]]
; CHECK-NEXT: DBG_VALUE debug-use [[REG4]]
%u.023 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]
%y.022 = phi i32 [ 13, %for.body.lr.ph ], [ %mul, %for.body ]
%x.021 = phi i32 [ 9, %for.body.lr.ph ], [ %add, %for.body ]
call void @llvm.dbg.value(metadata i32 %u.023, metadata !17, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %y.022, metadata !16, metadata !DIExpression()), !dbg !27
call void @llvm.dbg.value(metadata i32 %x.021, metadata !15, metadata !DIExpression()), !dbg !26
%add = add nuw nsw i32 %y.022, %x.021, !dbg !41
%mul = mul nsw i32 %y.022, 3, !dbg !43
%inc = add nuw nsw i32 %u.023, 1, !dbg !44
call void @llvm.dbg.value(metadata i32 %inc, metadata !17, metadata !DIExpression()), !dbg !28
call void @llvm.dbg.value(metadata i32 %mul, metadata !16, metadata !DIExpression()), !dbg !27
call void @llvm.dbg.value(metadata i32 %add, metadata !15, metadata !DIExpression()), !dbg !26
%cmp = icmp slt i32 %inc, %1, !dbg !35
br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !36, !llvm.loop !45
for.cond.cleanup3: ; preds = %for.body4
call void @llvm.lifetime.end.p0i8(i64 320, i8* nonnull %2) #3, !dbg !47
ret i32 %x.0.lcssa, !dbg !48
for.body4: ; preds = %for.body4, %for.cond.cleanup
%indvars.iv = phi i64 [ 0, %for.cond.cleanup ], [ %indvars.iv.next, %for.body4 ]
call void @llvm.dbg.value(metadata i64 %indvars.iv, metadata !24, metadata !DIExpression()), !dbg !39
%arrayidx = getelementptr inbounds [80 x i32], [80 x i32]* %arr, i64 0, i64 %indvars.iv, !dbg !49
%3 = trunc i64 %indvars.iv to i32, !dbg !52
%4 = add i32 %3, 3, !dbg !52
store volatile i32 %4, i32* %arrayidx, align 4, !dbg !52, !tbaa !31
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1, !dbg !53
call void @llvm.dbg.value(metadata i32 undef, metadata !24, metadata !DIExpression(DW_OP_plus_uconst, 1, DW_OP_stack_value)), !dbg !39
%exitcond = icmp eq i64 %indvars.iv.next, 64, !dbg !54
br i1 %exitcond, label %for.cond.cleanup3, label %for.body4, !dbg !40, !llvm.loop !55
}
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #2
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
attributes #0 = { nounwind uwtable }
attributes #1 = { argmemonly nounwind }
attributes #2 = { nounwind readnone speculatable }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!7, !8, !9}
!llvm.ident = !{!10}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "end", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 7.0.0 (x)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "debug.c", directory: "")
!4 = !{}
!5 = !{!0}
!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!7 = !{i32 2, !"Dwarf Version", i32 4}
!8 = !{i32 2, !"Debug Info Version", i32 3}
!9 = !{i32 1, !"wchar_size", i32 4}
!10 = !{!"clang version 7.0.0 (x)"}
!11 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 3, type: !12, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !2, retainedNodes: !14)
!12 = !DISubroutineType(types: !13)
!13 = !{!6}
!14 = !{!15, !16, !17, !19, !24}
!15 = !DILocalVariable(name: "x", scope: !11, file: !3, line: 4, type: !6)
!16 = !DILocalVariable(name: "y", scope: !11, file: !3, line: 5, type: !6)
!17 = !DILocalVariable(name: "u", scope: !18, file: !3, line: 6, type: !6)
!18 = distinct !DILexicalBlock(scope: !11, file: !3, line: 6, column: 3)
!19 = !DILocalVariable(name: "arr", scope: !11, file: !3, line: 11, type: !20)
!20 = !DICompositeType(tag: DW_TAG_array_type, baseType: !21, size: 2560, elements: !22)
!21 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !6)
!22 = !{!23}
!23 = !DISubrange(count: 80)
!24 = !DILocalVariable(name: "q", scope: !25, file: !3, line: 12, type: !6)
!25 = distinct !DILexicalBlock(scope: !11, file: !3, line: 12, column: 3)
!26 = !DILocation(line: 4, column: 7, scope: !11)
!27 = !DILocation(line: 5, column: 7, scope: !11)
!28 = !DILocation(line: 6, column: 12, scope: !18)
!29 = !DILocation(line: 6, column: 23, scope: !30)
!30 = distinct !DILexicalBlock(scope: !18, file: !3, line: 6, column: 3)
!31 = !{!32, !32, i64 0}
!32 = !{!"int", !33, i64 0}
!33 = !{!"omnipotent char", !34, i64 0}
!34 = !{!"Simple C/C++ TBAA"}
!35 = !DILocation(line: 6, column: 21, scope: !30)
!36 = !DILocation(line: 6, column: 3, scope: !18)
!37 = !DILocation(line: 11, column: 3, scope: !11)
!38 = !DILocation(line: 11, column: 16, scope: !11)
!39 = !DILocation(line: 12, column: 12, scope: !25)
!40 = !DILocation(line: 12, column: 3, scope: !25)
!41 = !DILocation(line: 7, column: 7, scope: !42)
!42 = distinct !DILexicalBlock(scope: !30, file: !3, line: 6, column: 33)
!43 = !DILocation(line: 8, column: 11, scope: !42)
!44 = !DILocation(line: 6, column: 28, scope: !30)
!45 = distinct !{!45, !36, !46}
!46 = !DILocation(line: 9, column: 3, scope: !18)
!47 = !DILocation(line: 17, column: 1, scope: !11)
!48 = !DILocation(line: 16, column: 3, scope: !11)
!49 = !DILocation(line: 13, column: 5, scope: !50)
!50 = distinct !DILexicalBlock(scope: !51, file: !3, line: 12, column: 32)
!51 = distinct !DILexicalBlock(scope: !25, file: !3, line: 12, column: 3)
!52 = !DILocation(line: 13, column: 12, scope: !50)
!53 = !DILocation(line: 12, column: 27, scope: !51)
!54 = !DILocation(line: 12, column: 21, scope: !51)
!55 = distinct !{!55, !40, !56}
!56 = !DILocation(line: 14, column: 3, scope: !25)
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