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
122 lines
5.0 KiB
YAML
122 lines
5.0 KiB
YAML
# RUN: llc -filetype=obj -o - %s | llvm-dwarfdump -a - | FileCheck %s
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#
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# This testcase has an implicit def pseudo-iunstruction with a debug location.
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#
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# CHECK: .debug_info contents:
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# CHECK: DW_TAG_subprogram
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# CHECK: DW_AT_low_pc (0x0000000000000000)
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# CHECK-NOT: DW_TAG
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# CHECK: DW_AT_specification {{.*}} "_ZN1C5m_fn3Ev"
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# CHECK-NOT: DW_TAG
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# Here should not be an inlined subroutine with 0 length.
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# CHECK: NULL
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#
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# CHECK: Address Line Column File ISA Discriminator Flags
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# CHECK-NEXT: ---
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# CHECK-NEXT: 25 0 1 0 0 is_stmt
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# CHECK-NEXT: 29 28 1 0 0 is_stmt prologue_end
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# CHECK-NEXT: 29 28 1 0 0 is_stmt end_sequence
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--- |
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source_filename = "t.ll"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx"
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%class.E = type { %class.D }
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%class.D = type { %class.B }
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%class.B = type { %class.A, %class.A }
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%class.A = type { i8 }
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%class.C = type <{ %class.E*, %class.B, [2 x i8] }>
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@a = local_unnamed_addr global %class.E* null, align 4
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define i32 @_ZN1C5m_fn3Ev(%class.C* nocapture) local_unnamed_addr align 2 !dbg !6 {
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%2 = alloca %class.B, align 1
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%3 = load %class.E*, %class.E** @a, align 4
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%4 = icmp eq %class.E* %3, null
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br i1 %4, label %10, label %5
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; <label>:5: ; preds = %1
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%6 = bitcast %class.C* %0 to %class.D**
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%7 = load %class.D*, %class.D** %6, align 4
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%8 = bitcast %class.D* %7 to i8*
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%9 = load i8, i8* %8, align 1
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br label %10
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; <label>:10: ; preds = %5, %1
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%11 = phi i8 [ %9, %5 ], [ undef, %1 ], !dbg !10
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%12 = getelementptr inbounds %class.C, %class.C* %0, i32 0, i32 1, i32 0, i32 0
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store i8 %11, i8* %12, align 1, !dbg !14
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ret i32 undef
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "Apple LLVM version 8.1.0 (clang-802.0.30.3)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !2)
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!1 = !DIFile(filename: "test.ii", directory: "/")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"PIC Level", i32 2}
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!6 = distinct !DISubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", scope: !7, file: !1, line: 25, type: !8, isLocal: false, isDefinition: true, scopeLine: 25, flags: DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !9, retainedNodes: !2)
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!7 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "C", file: !1, line: 14, size: 64, align: 32, elements: !2, identifier: "_ZTS1C")
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!8 = !DISubroutineType(types: !2)
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!9 = !DISubprogram(name: "m_fn3", linkageName: "_ZN1C5m_fn3Ev", scope: !7, file: !1, line: 15, type: !8, isLocal: false, isDefinition: false, scopeLine: 15, flags: DIFlagPrototyped, isOptimized: true)
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!10 = !DILocation(line: 99, column: 9, scope: !11, inlinedAt: !14)
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!11 = distinct !DISubprogram(name: "m_fn1", linkageName: "_ZN1A5m_fn1Ev", scope: !12, file: !1, line: 5, type: !8, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, declaration: !13, retainedNodes: !2)
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!12 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "A", file: !1, line: 1, size: 8, align: 8, elements: !2, identifier: "_ZTS1A")
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!13 = !DISubprogram(name: "m_fn1", linkageName: "_ZN1A5m_fn1Ev", scope: !12, file: !1, line: 5, type: !8, isLocal: false, isDefinition: false, scopeLine: 5, flags: DIFlagPublic | DIFlagPrototyped, isOptimized: true)
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!14 = !DILocation(line: 29, column: 28, scope: !6)
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...
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---
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name: _ZN1C5m_fn3Ev
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alignment: 4
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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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liveins:
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- { reg: '$rdi' }
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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: 0
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offsetAdjustment: 0
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maxAlignment: 8
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adjustsStack: false
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hasCalls: false
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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, name: '<unnamed alloca>', offset: -16, size: 2, alignment: 8 }
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body: |
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bb.0 (%ir-block.1):
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successors: %bb.1(0x30000000), %bb.2(0x50000000)
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liveins: $rdi
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CMP64mi8 $rip, 1, _, @a, _, 0, implicit-def $eflags :: (dereferenceable load 8 from @a, align 4)
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JE_1 %bb.1, implicit $eflags
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bb.2 (%ir-block.5):
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liveins: $rdi
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$rax = MOV64rm $rdi, 1, _, 0, _ :: (load 8 from %ir.6, align 4)
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$al = MOV8rm killed $rax, 1, _, 0, _ :: (load 1 from %ir.8)
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MOV8mr killed $rdi, 1, _, 8, _, killed $al, debug-location !14 :: (store 1 into %ir.12)
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RETQ undef $eax
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bb.1:
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liveins: $rdi
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$al = IMPLICIT_DEF debug-location !10
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MOV8mr killed $rdi, 1, _, 8, _, killed $al, debug-location !14 :: (store 1 into %ir.12)
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RETQ undef $eax
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...
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