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
124 lines
5.5 KiB
YAML
124 lines
5.5 KiB
YAML
# RUN: llc -start-before=livedebugvalues -filetype=obj -o - %s | \
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# RUN: llvm-dwarfdump - | FileCheck %s
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#
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# This is an artificial example of a debug value residing in a composite
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# location with a complex expression. Because the semantics of applying a DWARF
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# expression to a composite location are ill-defined, the compiler should bail
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# out of emitting a location.
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#
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# CHECK: .debug_info contents:
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# CHECK: DW_TAG_variable
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# CHECK-NOT: DW_AT_location
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# CHECK: DW_TAG
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--- |
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; Generated from:
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; typedef float vec2 __attribute__((vector_size(16)));
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; vec2 v();
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; float f() {
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; vec2 vec = v();
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; return vec[0] + vec[1];
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; }
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target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
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target triple = "thumbv7s-apple-ios5.0.0"
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define float @f() local_unnamed_addr #0 !dbg !9 {
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entry:
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%call = tail call <4 x float> bitcast (<4 x float> (...)* @v to <4 x float> ()*)() #0, !dbg !19
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tail call void @llvm.dbg.value(metadata <4 x float> %call, i64 0, metadata !14, metadata !20), !dbg !21
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%vecext = extractelement <4 x float> %call, i32 0, !dbg !22
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%vecext1 = extractelement <4 x float> %call, i32 1, !dbg !23
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%add = fadd float %vecext, %vecext1, !dbg !24
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ret float %add, !dbg !25
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}
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declare arm_aapcs_vfpcc <4 x float> @v(...) local_unnamed_addr #0
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #0
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attributes #0 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4}
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!llvm.ident = !{!8}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 4.0.0 (trunk 286322) (llvm/trunk 286305)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "v.c", directory: "/")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 2}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{!"clang version 4.0.0 (trunk 286322) (llvm/trunk 286305)"}
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!9 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !10, isLocal: false, isDefinition: true, scopeLine: 3, isOptimized: true, unit: !0, retainedNodes: !13)
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!10 = !DISubroutineType(types: !11)
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!11 = !{!12}
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!12 = !DIBasicType(name: "float", size: 32, encoding: DW_ATE_float)
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!13 = !{!14}
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!14 = !DILocalVariable(name: "vec", scope: !9, file: !1, line: 4, type: !15)
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!15 = !DIDerivedType(tag: DW_TAG_typedef, name: "vec2", file: !1, line: 1, baseType: !16)
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!16 = !DICompositeType(tag: DW_TAG_array_type, baseType: !12, size: 128, flags: DIFlagVector, elements: !17)
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!17 = !{!18}
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!18 = !DISubrange(count: 4)
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!19 = !DILocation(line: 4, column: 13, scope: !9)
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!20 = !DIExpression(DW_OP_plus_uconst, 1, DW_OP_constu, 1, DW_OP_minus)
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!21 = !DILocation(line: 4, column: 7, scope: !9)
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!22 = !DILocation(line: 5, column: 9, scope: !9)
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!23 = !DILocation(line: 5, column: 18, scope: !9)
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!24 = !DILocation(line: 5, column: 16, scope: !9)
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!25 = !DILocation(line: 5, column: 2, scope: !9)
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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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legalized: false
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regBankSelected: false
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selected: false
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tracksRegLiveness: true
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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', '$r10', '$r11', '$s16',
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'$s17', '$s18', '$s19', '$s20', '$s21', '$s22',
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'$s23', '$s24', '$s25', '$s26', '$s27', '$s28',
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'$s29', '$s30', '$s31', '$d8_d10', '$d9_d11', '$d10_d12',
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'$d11_d13', '$d12_d14', '$d13_d15', '$q4_q5', '$q5_q6',
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'$q6_q7', '$q4_q5_q6_q7', '$r4_r5', '$r6_r7', '$r10_r11',
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'$d8_d9_d10', '$d9_d10_d11', '$d10_d11_d12', '$d11_d12_d13',
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'$d12_d13_d14', '$d13_d14_d15', '$d8_d10_d12',
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'$d9_d11_d13', '$d10_d12_d14', '$d11_d13_d15',
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'$d8_d10_d12_d14', '$d9_d11_d13_d15', '$d9_d10',
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'$d11_d12', '$d13_d14', '$d9_d10_d11_d12', '$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: 4
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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' }
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body: |
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bb.0.entry:
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liveins: $lr
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early-clobber $sp = frame-setup t2STR_PRE killed undef $lr, $sp, -4, 14, _
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frame-setup CFI_INSTRUCTION def_cfa_offset 4
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frame-setup CFI_INSTRUCTION offset $lr, -4
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tBL 14, _, @v, csr_ios, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0, implicit-def $r1, implicit-def $r2, implicit-def $r3, debug-location !19
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$d1 = VMOVDRR killed $r2, killed $r3, 14, _, implicit-def $q0, debug-location !19
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$d0 = VMOVDRR killed $r0, killed $r1, 14, _, implicit killed $q0, implicit-def $q0, debug-location !19
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DBG_VALUE debug-use $q0, debug-use _, !14, !20, debug-location !21
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$s4 = VMOVS $s1, 14, _, implicit-def $d2, debug-location !24
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$d0 = VADDfd $d0, killed $d2, 14, _, implicit killed $q0, debug-location !24
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$r0 = VMOVRS $s0, 14, _, implicit killed $d0, debug-location !25
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$lr, $sp = t2LDR_POST $sp, 4, 14, _, debug-location !25
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tBX_RET 14, _, implicit $r0, debug-location !25
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...
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