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clang-p2996/llvm/test/CodeGen/X86/shrink_wrap_dbg_value.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 -o - %s -run-pass=shrink-wrap | FileCheck %s
--- |
; ModuleID = '<stdin>'
source_filename = "t.c"
target datalayout = "e-m:x-p:32:32-i64:64-f80:32-n8:16:32-a:0:32-S32"
target triple = "i386-pc-windows-msvc19.11.25508"
; Function Attrs: nounwind
define x86_fastcallcc i32 @"@shrink_wrap_basic@16"(i32 inreg %a, i32 inreg %b, i32 %c, i32 %d) local_unnamed_addr #0 !dbg !8 {
entry:
%c.addr = alloca i32, align 4
tail call void @llvm.dbg.value(metadata i32 %d, metadata !13, metadata !DIExpression()), !dbg !19
tail call void @llvm.dbg.value(metadata i32 %c, metadata !14, metadata !DIExpression()), !dbg !20
store i32 %c, i32* %c.addr, align 4, !tbaa !21
tail call void @llvm.dbg.value(metadata i32 %b, metadata !15, metadata !DIExpression()), !dbg !25
tail call void @llvm.dbg.value(metadata i32 %a, metadata !16, metadata !DIExpression()), !dbg !26
%cmp = icmp slt i32 %a, %b, !dbg !27
br i1 %cmp, label %return, label %for.cond.preheader, !dbg !29
for.cond.preheader: ; preds = %entry
%0 = add i32 %c, -1, !dbg !30
br label %for.cond, !dbg !30
for.cond: ; preds = %for.cond, %for.cond.preheader
%lsr.iv = phi i32 [ %lsr.iv.next, %for.cond ], [ %0, %for.cond.preheader ]
call void @llvm.dbg.value(metadata i32 undef, metadata !17, metadata !DIExpression()), !dbg !32
call void @llvm.dbg.value(metadata i32* %c.addr, metadata !14, metadata !DIExpression()), !dbg !20
%call = call i32 @doSomething(i32* nonnull %c.addr) #3, !dbg !33
call void @llvm.dbg.value(metadata !2, metadata !17, metadata !DIExpression()), !dbg !32
%lsr.iv.next = add i32 %lsr.iv, 1, !dbg !30
%cmp1 = icmp slt i32 %lsr.iv.next, %d, !dbg !30
br i1 %cmp1, label %for.cond, label %return, !dbg !34, !llvm.loop !35
return: ; preds = %for.cond, %entry
%retval.0 = phi i32 [ %a, %entry ], [ %call, %for.cond ]
ret i32 %retval.0, !dbg !37
}
declare i32 @doSomething(i32*) local_unnamed_addr
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #2
; Function Attrs: nounwind
declare void @llvm.stackprotector(i8*, i8**) #3
attributes #0 = { nounwind }
attributes #2 = { nounwind readnone speculatable }
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 version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "t.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild", checksumkind: CSK_MD5, checksum: "32f118fd5dd7e65ff7733c49b2f804ef")
!2 = !{}
!3 = !{i32 1, !"NumRegisterParameters", i32 0}
!4 = !{i32 2, !"CodeView", i32 1}
!5 = !{i32 2, !"Debug Info Version", i32 3}
!6 = !{i32 1, !"wchar_size", i32 2}
!7 = !{!"clang version 6.0.0 "}
!8 = distinct !DISubprogram(name: "shrink_wrap_basic", linkageName: "\01@shrink_wrap_basic@16", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
!9 = !DISubroutineType(cc: DW_CC_BORLAND_msfastcall, types: !10)
!10 = !{!11, !11, !11, !11, !11}
!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!12 = !{!13, !14, !15, !16, !17}
!13 = !DILocalVariable(name: "d", arg: 4, scope: !8, file: !1, line: 2, type: !11)
!14 = !DILocalVariable(name: "c", arg: 3, scope: !8, file: !1, line: 2, type: !11)
!15 = !DILocalVariable(name: "b", arg: 2, scope: !8, file: !1, line: 2, type: !11)
!16 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 2, type: !11)
!17 = !DILocalVariable(name: "i", scope: !18, file: !1, line: 5, type: !11)
!18 = distinct !DILexicalBlock(scope: !8, file: !1, line: 5, column: 3)
!19 = !DILocation(line: 2, column: 59, scope: !8)
!20 = !DILocation(line: 2, column: 52, scope: !8)
!21 = !{!22, !22, i64 0}
!22 = !{!"int", !23, i64 0}
!23 = !{!"omnipotent char", !24, i64 0}
!24 = !{!"Simple C/C++ TBAA"}
!25 = !DILocation(line: 2, column: 45, scope: !8)
!26 = !DILocation(line: 2, column: 38, scope: !8)
!27 = !DILocation(line: 3, column: 9, scope: !28)
!28 = distinct !DILexicalBlock(scope: !8, file: !1, line: 3, column: 7)
!29 = !DILocation(line: 3, column: 7, scope: !8)
!30 = !DILocation(line: 5, column: 21, scope: !31)
!31 = distinct !DILexicalBlock(scope: !18, file: !1, line: 5, column: 3)
!32 = !DILocation(line: 5, column: 12, scope: !18)
!33 = !DILocation(line: 0, scope: !8)
!34 = !DILocation(line: 5, column: 3, scope: !18)
!35 = distinct !{!35, !34, !36}
!36 = !DILocation(line: 6, column: 19, scope: !18)
!37 = !DILocation(line: 8, column: 1, scope: !8)
...
---
name: '@shrink_wrap_basic@16'
alignment: 4
exposesReturnsTwice: false
legalized: false
regBankSelected: false
selected: false
tracksRegLiveness: true
registers:
liveins:
- { reg: '$ecx', virtual-reg: '' }
- { reg: '$edx', virtual-reg: '' }
frameInfo:
isFrameAddressTaken: false
isReturnAddressTaken: false
hasStackMap: false
hasPatchPoint: false
stackSize: 0
offsetAdjustment: 0
maxAlignment: 4
adjustsStack: false
hasCalls: true
stackProtector: ''
maxCallFrameSize: 4294967295
hasOpaqueSPAdjustment: false
hasVAStart: false
hasMustTailInVarArgFunc: false
# CHECK: savePoint: '%bb.1'
# CHECK: restorePoint: '%bb.3'
savePoint: ''
restorePoint: ''
fixedStack:
- { id: 0, type: default, offset: 4, size: 4, alignment: 4, stack-id: 0,
isImmutable: true, isAliased: false, callee-saved-register: '', callee-saved-restored: true }
- { id: 1, type: default, offset: 0, size: 4, alignment: 4, stack-id: 0,
isImmutable: false, isAliased: false, callee-saved-register: '',
callee-saved-restored: true }
stack:
constants:
body: |
bb.0.entry:
successors: %bb.4(0x40000000), %bb.1(0x40000000)
liveins: $ecx, $edx
DBG_VALUE debug-use $edx, debug-use $noreg, !15, !DIExpression(), debug-location !25
DBG_VALUE debug-use $ecx, debug-use $noreg, !16, !DIExpression(), debug-location !26
$eax = COPY $ecx
DBG_VALUE %fixed-stack.0, 0, !16, !DIExpression(), debug-location !26
DBG_VALUE %fixed-stack.1, 0, !15, !DIExpression(), debug-location !25
CMP32rr $eax, killed $edx, implicit-def $eflags, debug-location !27
JL_1 %bb.4, implicit killed $eflags, debug-location !29
JMP_1 %bb.1, debug-location !29
bb.1.for.cond.preheader:
successors: %bb.2(0x80000000)
$esi = MOV32rm %fixed-stack.0, 1, $noreg, 0, $noreg :: (load 4 from %fixed-stack.0)
DBG_VALUE debug-use $esi, debug-use $noreg, !13, !DIExpression(), debug-location !19
$edi = MOV32rm %fixed-stack.1, 1, $noreg, 0, $noreg :: (load 4 from %fixed-stack.1)
DBG_VALUE debug-use $edi, debug-use $noreg, !14, !DIExpression(), debug-location !20
$edi = DEC32r killed $edi, implicit-def dead $eflags, debug-location !30
$ebx = LEA32r %fixed-stack.1, 1, $noreg, 0, $noreg
bb.2.for.cond:
successors: %bb.2(0x7c000000), %bb.3(0x04000000)
liveins: $ebx, $edi, $esi
ADJCALLSTACKDOWN32 4, 0, 4, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp, debug-location !33
DBG_VALUE %fixed-stack.1, 0, !14, !DIExpression(), debug-location !20
PUSH32r $ebx, implicit-def $esp, implicit $esp, debug-location !33
CFI_INSTRUCTION adjust_cfa_offset 4, debug-location !33
CALLpcrel32 @doSomething, csr_32, implicit $esp, implicit $ssp, implicit-def $esp, implicit-def $ssp, implicit-def $eax, debug-location !33
ADJCALLSTACKUP32 4, 0, implicit-def dead $esp, implicit-def dead $eflags, implicit-def dead $ssp, implicit $esp, implicit $ssp, debug-location !33
$edi = INC32r killed $edi, implicit-def dead $eflags, debug-location !30
CMP32rr $edi, $esi, implicit-def $eflags, debug-location !30
JL_1 %bb.2, implicit killed $eflags, debug-location !34
bb.3:
successors: %bb.4(0x80000000)
liveins: $eax
bb.4.return:
liveins: $eax
RET 8, $eax, debug-location !37
...
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