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clang-p2996/llvm/test/CodeGen/ARM/dbg-range-extension.mir
Shiva Chen 2c864551df [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

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# RUN: llc -mtriple=arm-eabi -run-pass=livedebugvalues %s -o - | FileCheck %s
#
# Check that the debug information for variables are propagated into the correct blocks.
#
# Generated from the C source:
#
# int func2(int, int);
# void func(int a) {
# int b = func2(10, 11);
# if (a) {
# int c = func2(12, 13);
# for(int i = 1; i < a; i++) {
# func2(i, i+b);
# }
# func2(b,c);
# }
# func2(b,a);
# }
# CHECK: [[VAR_A:![0-9]+]] = !DILocalVariable(name: "a",
# CHECK: [[VAR_B:![0-9]+]] = !DILocalVariable(name: "b",
# CHECK: [[VAR_C:![0-9]+]] = !DILocalVariable(name: "c",
# CHECK: [[VAR_I:![0-9]+]] = !DILocalVariable(name: "i",
# CHECK: bb.0.entry
# CHECK: DBG_VALUE debug-use $r0, debug-use $noreg, [[VAR_A]]
# CHECK: DBG_VALUE debug-use [[REG_A:\$r[0-9]+]], debug-use $noreg, [[VAR_A]]
# CHECK: DBG_VALUE debug-use [[REG_B:\$r[0-9]+]], debug-use $noreg, [[VAR_B]]
# CHECK: bb.1.if.then
# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use $noreg, [[VAR_B]]
# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use $noreg, [[VAR_A]]
# CHECK: DBG_VALUE debug-use [[REG_C:\$r[0-9]+]], debug-use $noreg, [[VAR_C]]
# CHECK: DBG_VALUE 1, 0, [[VAR_I]]
# CHECK: bb.2.for.body
# CHECK: DBG_VALUE debug-use [[REG_I:\$r[0-9]+]], debug-use $noreg, [[VAR_I]]
# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use $noreg, [[VAR_C]]
# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use $noreg, [[VAR_B]]
# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use $noreg, [[VAR_A]]
# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use $noreg, [[VAR_I]]
# CHECK: bb.3.for.cond
# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use $noreg, [[VAR_C]]
# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use $noreg, [[VAR_B]]
# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use $noreg, [[VAR_A]]
# CHECK: DBG_VALUE debug-use [[REG_I]], debug-use $noreg, [[VAR_I]]
# CHECK: bb.4.for.cond.cleanup
# CHECK: DBG_VALUE debug-use [[REG_C]], debug-use $noreg, [[VAR_C]]
# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use $noreg, [[VAR_B]]
# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use $noreg, [[VAR_A]]
# CHECK: bb.5.if.end
# CHECK: DBG_VALUE debug-use [[REG_B]], debug-use $noreg, [[VAR_B]]
# CHECK: DBG_VALUE debug-use [[REG_A]], debug-use $noreg, [[VAR_A]]
--- |
; ModuleID = '/data/kwalker/work/OpenSource-llvm/llvm/test/CodeGen/ARM/dbg-range-extension.ll'
source_filename = "/data/kwalker/work/OpenSource-llvm/llvm/test/CodeGen/ARM/dbg-range-extension.ll"
target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
target triple = "arm---eabi"
; Function Attrs: minsize nounwind optsize
define void @func(i32 %a) local_unnamed_addr #0 !dbg !8 {
entry:
tail call void @llvm.dbg.value(metadata i32 %a, i64 0, metadata !13, metadata !20), !dbg !21
%call = tail call i32 @func2(i32 10, i32 11) #0, !dbg !22
tail call void @llvm.dbg.value(metadata i32 %call, i64 0, metadata !14, metadata !20), !dbg !23
%tobool = icmp eq i32 %a, 0, !dbg !24
br i1 %tobool, label %if.end, label %if.then, !dbg !25
if.then: ; preds = %entry
%call1 = tail call i32 @func2(i32 12, i32 13) #0, !dbg !26
tail call void @llvm.dbg.value(metadata i32 %call1, i64 0, metadata !15, metadata !20), !dbg !27
tail call void @llvm.dbg.value(metadata i32 1, i64 0, metadata !18, metadata !20), !dbg !28
br label %for.cond, !dbg !29
for.cond: ; preds = %for.body, %if.then
%i.0 = phi i32 [ 1, %if.then ], [ %inc, %for.body ]
tail call void @llvm.dbg.value(metadata i32 %i.0, i64 0, metadata !18, metadata !20), !dbg !28
%cmp = icmp slt i32 %i.0, %a, !dbg !30
br i1 %cmp, label %for.body, label %for.cond.cleanup, !dbg !33
for.cond.cleanup: ; preds = %for.cond
%call3 = tail call i32 @func2(i32 %call, i32 %call1) #0, !dbg !34
br label %if.end, !dbg !35
for.body: ; preds = %for.cond
%0 = add i32 %call, %i.0, !dbg !36
%call2 = tail call i32 @func2(i32 %i.0, i32 %0) #0, !dbg !36
%inc = add nuw nsw i32 %i.0, 1, !dbg !38
tail call void @llvm.dbg.value(metadata i32 %inc, i64 0, metadata !18, metadata !20), !dbg !28
br label %for.cond, !dbg !40, !llvm.loop !41
if.end: ; preds = %for.cond.cleanup, %entry
%call4 = tail call i32 @func2(i32 %call, i32 %a) #0, !dbg !43
ret void, !dbg !44
}
; Function Attrs: minsize optsize
declare i32 @func2(i32, i32) local_unnamed_addr #1
; Function Attrs: nounwind readnone
declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**) #3
attributes #0 = { minsize nounwind optsize }
attributes #1 = { minsize optsize }
attributes #2 = { nounwind readnone }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "loop.c", directory: "/tmp")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{i32 1, !"min_enum_size", i32 4}
!7 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git b8f10df3679b36f51e1de7c4351b82d297825089) (http://llvm.org/git/llvm.git c2a5d16d1e3b8c49f5bbb1ff87a76ac4f88edb89)"}
!8 = distinct !DISubprogram(name: "func", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
!9 = !DISubroutineType(types: !10)
!10 = !{null, !11}
!11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!12 = !{!13, !14, !15, !18}
!13 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 2, type: !11)
!14 = !DILocalVariable(name: "b", scope: !8, file: !1, line: 3, type: !11)
!15 = !DILocalVariable(name: "c", scope: !16, file: !1, line: 5, type: !11)
!16 = distinct !DILexicalBlock(scope: !17, file: !1, line: 4, column: 9)
!17 = distinct !DILexicalBlock(scope: !8, file: !1, line: 4, column: 6)
!18 = !DILocalVariable(name: "i", scope: !19, file: !1, line: 6, type: !11)
!19 = distinct !DILexicalBlock(scope: !16, file: !1, line: 6, column: 3)
!20 = !DIExpression()
!21 = !DILocation(line: 2, column: 15, scope: !8)
!22 = !DILocation(line: 3, column: 17, scope: !8)
!23 = !DILocation(line: 3, column: 13, scope: !8)
!24 = !DILocation(line: 4, column: 6, scope: !17)
!25 = !DILocation(line: 4, column: 6, scope: !8)
!26 = !DILocation(line: 5, column: 11, scope: !16)
!27 = !DILocation(line: 5, column: 7, scope: !16)
!28 = !DILocation(line: 6, column: 11, scope: !19)
!29 = !DILocation(line: 6, column: 7, scope: !19)
!30 = !DILocation(line: 6, column: 20, scope: !31)
!31 = !DILexicalBlockFile(scope: !32, file: !1, discriminator: 1)
!32 = distinct !DILexicalBlock(scope: !19, file: !1, line: 6, column: 3)
!33 = !DILocation(line: 6, column: 3, scope: !31)
!34 = !DILocation(line: 9, column: 3, scope: !16)
!35 = !DILocation(line: 10, column: 2, scope: !16)
!36 = !DILocation(line: 7, column: 4, scope: !37)
!37 = distinct !DILexicalBlock(scope: !32, file: !1, line: 6, column: 30)
!38 = !DILocation(line: 6, column: 26, scope: !39)
!39 = !DILexicalBlockFile(scope: !32, file: !1, discriminator: 3)
!40 = !DILocation(line: 6, column: 3, scope: !39)
!41 = distinct !{!41, !42}
!42 = !DILocation(line: 6, column: 3, scope: !16)
!43 = !DILocation(line: 11, column: 2, scope: !8)
!44 = !DILocation(line: 12, column: 1, scope: !8)
...
---
name: func
alignment: 2
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
tracksRegLiveness: false
liveins:
- { reg: '$r0' }
calleeSavedRegisters: [ '$lr', '$d8', '$d9', '$d10', '$d11', '$d12', '$d13',
'$d14', '$d15', '$q4', '$q5', '$q6', '$q7', '$r4',
'$r5', '$r6', '$r7', '$r8', '$r9', '$r10', '$r11',
'$s16', '$s17', '$s18', '$s19', '$s20', '$s21',
'$s22', '$s23', '$s24', '$s25', '$s26', '$s27',
'$s28', '$s29', '$s30', '$s31', '$d8_d10', '$d9_d11',
'$d10_d12', '$d11_d13', '$d12_d14', '$d13_d15',
'$q4_q5', '$q5_q6', '$q6_q7', '$q4_q5_q6_q7', '$r4_r5',
'$r6_r7', '$r8_r9', '$r10_r11', '$d8_d9_d10', '$d9_d10_d11',
'$d10_d11_d12', '$d11_d12_d13', '$d12_d13_d14',
'$d13_d14_d15', '$d8_d10_d12', '$d9_d11_d13', '$d10_d12_d14',
'$d11_d13_d15', '$d8_d10_d12_d14', '$d9_d11_d13_d15',
'$d9_d10', '$d11_d12', '$d13_d14', '$d9_d10_d11_d12',
'$d11_d12_d13_d14' ]
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 24
offsetAdjustment: 0
maxAlignment: 4
adjustsStack: true
hasCalls: true
maxCallFrameSize: 0
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
stack:
- { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, callee-saved-register: '$lr' }
- { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, callee-saved-register: '$r11' }
- { id: 2, type: spill-slot, offset: -12, size: 4, alignment: 4, callee-saved-register: '$r7' }
- { id: 3, type: spill-slot, offset: -16, size: 4, alignment: 4, callee-saved-register: '$r6' }
- { id: 4, type: spill-slot, offset: -20, size: 4, alignment: 4, callee-saved-register: '$r5' }
- { id: 5, type: spill-slot, offset: -24, size: 4, alignment: 4, callee-saved-register: '$r4' }
body: |
bb.0.entry:
liveins: $r0, $r4, $r5, $r6, $r7, $r11, $lr
$sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r5, killed $r6, killed $r7, killed $r11, killed $lr
frame-setup CFI_INSTRUCTION def_cfa_offset 24
frame-setup CFI_INSTRUCTION offset $lr, -4
frame-setup CFI_INSTRUCTION offset $r11, -8
frame-setup CFI_INSTRUCTION offset $r7, -12
frame-setup CFI_INSTRUCTION offset $r6, -16
frame-setup CFI_INSTRUCTION offset $r5, -20
frame-setup CFI_INSTRUCTION offset $r4, -24
DBG_VALUE debug-use $r0, debug-use $noreg, !13, !20, debug-location !21
$r4 = MOVr killed $r0, 14, $noreg, $noreg
DBG_VALUE debug-use $r4, debug-use $noreg, !13, !20, debug-location !21
$r0 = MOVi 10, 14, $noreg, _, debug-location !22
$r1 = MOVi 11, 14, $noreg, _, debug-location !22
BL @func2, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit killed $r1, implicit-def $sp, implicit-def $r0, debug-location !22
$r5 = MOVr killed $r0, 14, $noreg, _, debug-location !22
DBG_VALUE debug-use $r5, debug-use $noreg, !14, !20, debug-location !23
CMPri $r4, 0, 14, $noreg, implicit-def $cpsr, debug-location !25
Bcc %bb.5.if.end, 0, killed $cpsr
bb.1.if.then:
liveins: $r4, $r5
$r0 = MOVi 12, 14, $noreg, _, debug-location !26
$r1 = MOVi 13, 14, $noreg, _, debug-location !26
BL @func2, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit killed $r1, implicit-def $sp, implicit-def $r0, debug-location !26
$r6 = MOVr killed $r0, 14, $noreg, _, debug-location !26
DBG_VALUE debug-use $r6, debug-use $noreg, !15, !20, debug-location !27
$r7 = MOVi 1, 14, $noreg, $noreg
DBG_VALUE 1, 0, !18, !20, debug-location !28
B %bb.3.for.cond
bb.2.for.body:
liveins: $r4, $r5, $r6, $r7
$r1 = ADDrr $r5, $r7, 14, $noreg, _, debug-location !36
$r0 = MOVr $r7, 14, $noreg, _, debug-location !36
BL @func2, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit killed $r1, implicit-def $sp, implicit-def dead $r0, debug-location !36
$r7 = ADDri killed $r7, 1, 14, $noreg, _, debug-location !38
DBG_VALUE debug-use $r7, debug-use $noreg, !18, !20, debug-location !28
bb.3.for.cond:
liveins: $r4, $r5, $r6, $r7
DBG_VALUE debug-use $r7, debug-use $noreg, !18, !20, debug-location !28
CMPrr $r7, $r4, 14, $noreg, implicit-def $cpsr, debug-location !33
Bcc %bb.2.for.body, 11, killed $cpsr, debug-location !33
bb.4.for.cond.cleanup:
liveins: $r4, $r5, $r6
$r0 = MOVr $r5, 14, $noreg, _, debug-location !34
$r1 = MOVr killed $r6, 14, $noreg, _, debug-location !34
BL @func2, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit killed $r1, implicit-def $sp, implicit-def dead $r0, debug-location !34
bb.5.if.end:
liveins: $r4, $r5
$r0 = MOVr killed $r5, 14, $noreg, _, debug-location !43
$r1 = MOVr killed $r4, 14, $noreg, _, debug-location !43
$sp = LDMIA_UPD $sp, 14, $noreg, def $r4, def $r5, def $r6, def $r7, def $r11, def $lr, debug-location !43
TAILJMPd @func2, implicit $sp, implicit $sp, implicit killed $r0, implicit killed $r1, debug-location !43
...
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