2c864551df
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
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8.4 KiB
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158 lines
8.4 KiB
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# RUN: llc -mtriple thumbv7 -verify-machineinstrs -start-after if-converter -print-before post-RA-sched -print-after post-RA-sched %s -o /dev/null 2>&1 | FileCheck %s
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--- |
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; ModuleID = '/Volumes/Data/llvm/test/CodeGen/ARM/sched-it-debug-nodes.ll'
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target datalayout = "e-m:e-p:32:32-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "thumbv7"
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%struct.s = type opaque
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; Function Attrs: nounwind
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define arm_aapcscc i32 @f(%struct.s* %s, i32 %u, i8* %b, i32 %n) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata %struct.s* %s, i64 0, metadata !18, metadata !27), !dbg !28
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tail call void @llvm.dbg.value(metadata i32 %u, i64 0, metadata !19, metadata !27), !dbg !28
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tail call void @llvm.dbg.value(metadata i8* %b, i64 0, metadata !20, metadata !27), !dbg !28
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tail call void @llvm.dbg.value(metadata i32 %n, i64 0, metadata !21, metadata !27), !dbg !28
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%cmp = icmp ult i32 %n, 4, !dbg !29
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br i1 %cmp, label %return, label %if.end, !dbg !31
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if.end: ; preds = %entry
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tail call arm_aapcscc void @g(%struct.s* %s, i8* %b, i32 %n) #3, !dbg !32
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br label %return, !dbg !33
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return: ; preds = %if.end, %entry
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%retval.0 = phi i32 [ 0, %if.end ], [ -1, %entry ]
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ret i32 %retval.0, !dbg !34
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}
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; NOTE: This is checking that the register in the DEBUG_VALUE node is not
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; accidentally being marked as KILL. The DBG_VALUE node gets introduced in
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; If-Conversion, and gets bundled into the IT block. The Post RA Scheduler
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; attempts to schedule the Machine Instr, and tries to tag the register in the
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; debug value as KILL'ed, resulting in a DEBUG_VALUE node changing codegen! (or
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; hopefully, triggering an assert).
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; CHECK: BUNDLE implicit-def dead $itstate{{.*}} {
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; CHECK: DBG_VALUE debug-use $r1, debug-use $noreg, !"u"
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; CHECK-NOT: DBG_VALUE killed $r1, $noreg, !"u"
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declare arm_aapcscc void @g(%struct.s*, i8*, i32) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #2
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!22, !23, !24, !25}
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!llvm.ident = !{!26}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (llvm/trunk 237059)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "/Users/compnerd/Source/llvm")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 9, type: !5, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !17)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7, !8, !11, !12, !16}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !9, size: 32, align: 32)
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!9 = !DIDerivedType(tag: DW_TAG_typedef, name: "s", file: !1, line: 5, baseType: !10)
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!10 = !DICompositeType(tag: DW_TAG_structure_type, name: "s", file: !1, line: 5, flags: DIFlagFwdDecl)
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!11 = !DIBasicType(name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 32, align: 32)
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!13 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !14)
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!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "uint8_t", file: !1, line: 2, baseType: !15)
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!15 = !DIBasicType(name: "unsigned char", size: 8, align: 8, encoding: DW_ATE_unsigned_char)
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!16 = !DIDerivedType(tag: DW_TAG_typedef, name: "size_t", file: !1, line: 3, baseType: !11)
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!17 = !{!18, !19, !20, !21}
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!18 = !DILocalVariable(name: "s", arg: 1, scope: !4, file: !1, line: 9, type: !8)
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!19 = !DILocalVariable(name: "u", arg: 2, scope: !4, file: !1, line: 9, type: !11)
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!20 = !DILocalVariable(name: "b", arg: 3, scope: !4, file: !1, line: 9, type: !12)
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!21 = !DILocalVariable(name: "n", arg: 4, scope: !4, file: !1, line: 9, type: !16)
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!22 = !{i32 2, !"Dwarf Version", i32 4}
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!23 = !{i32 2, !"Debug Info Version", i32 3}
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!24 = !{i32 1, !"wchar_size", i32 4}
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!25 = !{i32 1, !"min_enum_size", i32 4}
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!26 = !{!"clang version 3.7.0 (llvm/trunk 237059)"}
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!27 = !DIExpression()
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!28 = !DILocation(line: 9, scope: !4)
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!29 = !DILocation(line: 10, scope: !30)
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!30 = distinct !DILexicalBlock(scope: !4, file: !1, line: 10)
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!31 = !DILocation(line: 10, scope: !4)
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!32 = !DILocation(line: 13, scope: !4)
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!33 = !DILocation(line: 14, scope: !4)
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!34 = !DILocation(line: 15, scope: !4)
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...
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---
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name: f
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alignment: 1
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exposesReturnsTwice: false
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tracksRegLiveness: true
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liveins:
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- { reg: '$r0' }
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- { reg: '$r1' }
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- { reg: '$r2' }
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- { reg: '$r3' }
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calleeSavedRegisters: [ '$lr', '$d8', '$d9', '$d10', '$d11', '$d12', '$d13',
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'$d14', '$d15', '$q4', '$q5', '$q6', '$q7', '$r4',
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'$r5', '$r6', '$r7', '$r8', '$r9', '$r10', '$r11',
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'$s16', '$s17', '$s18', '$s19', '$s20', '$s21',
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'$s22', '$s23', '$s24', '$s25', '$s26', '$s27',
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'$s28', '$s29', '$s30', '$s31', '$d8_d10', '$d9_d11',
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'$d10_d12', '$d11_d13', '$d12_d14', '$d13_d15',
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'$q4_q5', '$q5_q6', '$q6_q7', '$q4_q5_q6_q7', '$r4_r5',
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'$r6_r7', '$r8_r9', '$r10_r11', '$d8_d9_d10', '$d9_d10_d11',
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'$d10_d11_d12', '$d11_d12_d13', '$d12_d13_d14',
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'$d13_d14_d15', '$d8_d10_d12', '$d9_d11_d13', '$d10_d12_d14',
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'$d11_d13_d15', '$d8_d10_d12_d14', '$d9_d11_d13_d15',
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'$d9_d10', '$d11_d12', '$d13_d14', '$d9_d10_d11_d12',
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'$d11_d12_d13_d14' ]
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 8
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offsetAdjustment: 0
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maxAlignment: 4
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adjustsStack: true
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hasCalls: true
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maxCallFrameSize: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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stack:
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- { id: 0, type: spill-slot, offset: -4, size: 4, alignment: 4, callee-saved-register: '$lr', callee-saved-restored: false }
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- { id: 1, type: spill-slot, offset: -8, size: 4, alignment: 4, callee-saved-register: '$r7' }
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body: |
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bb.0.entry:
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liveins: $r0, $r1, $r2, $r3, $lr, $r7
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DBG_VALUE debug-use $r0, debug-use $noreg, !18, !27, debug-location !28
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DBG_VALUE debug-use $r1, debug-use $noreg, !19, !27, debug-location !28
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DBG_VALUE debug-use $r2, debug-use $noreg, !20, !27, debug-location !28
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DBG_VALUE debug-use $r3, debug-use $noreg, !21, !27, debug-location !28
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t2CMPri $r3, 4, 14, $noreg, implicit-def $cpsr, debug-location !31
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DBG_VALUE debug-use $r1, debug-use $noreg, !19, !27, debug-location !28
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$r0 = t2MOVi -1, 3, $cpsr, $noreg, implicit undef $r0
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DBG_VALUE debug-use $r1, debug-use $noreg, !19, !27, debug-location !28
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tBX_RET 3, $cpsr, implicit $r0, debug-location !34
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$sp = frame-setup t2STMDB_UPD $sp, 14, $noreg, killed $r7, killed $lr
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frame-setup CFI_INSTRUCTION def_cfa_offset 8
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frame-setup CFI_INSTRUCTION offset $lr, -4
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frame-setup CFI_INSTRUCTION offset $r7, -8
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DBG_VALUE debug-use $r0, debug-use $noreg, !18, !27, debug-location !28
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DBG_VALUE debug-use $r1, debug-use $noreg, !19, !27, debug-location !28
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DBG_VALUE debug-use $r2, debug-use $noreg, !20, !27, debug-location !28
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DBG_VALUE debug-use $r3, debug-use $noreg, !21, !27, debug-location !28
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$r1 = tMOVr killed $r2, 14, $noreg, debug-location !32
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$r2 = tMOVr killed $r3, 14, $noreg, debug-location !32
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tBL 14, $noreg, @g, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit $r0, implicit $r1, implicit $r2, implicit-def $sp, debug-location !32
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$r0 = t2MOVi 0, 14, $noreg, $noreg
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$sp = t2LDMIA_RET $sp, 14, $noreg, def $r7, def $pc, implicit $r0
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...
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