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a2029fa58e
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
115 lines
4.6 KiB
LLVM
115 lines
4.6 KiB
LLVM
; RUN: llc -o - %s | FileCheck %s
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; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump -v - | FileCheck %s --check-prefix=DWARF
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; This test checks that parameters on the stack pointer are correctly
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; referenced by debug info.
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target triple = "x86_64--"
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@glob = external global i64
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@ptr = external global i32*
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%struct.s = type { i32, i32, i32, i32, i32 }
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; Simple case: no FP, use offset from RSP.
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; CHECK-LABEL: f0:
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; CHECK-NOT: pushq
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; CHECK: movl $42, %eax
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; CHECK: retq
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define i32 @f0(%struct.s* byval align 8 %input) !dbg !8 {
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call void @llvm.dbg.declare(metadata %struct.s* %input, metadata !4, metadata !17), !dbg !18
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ret i32 42, !dbg !18
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}
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; DWARF-LABEL: .debug_info contents:
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; DWARF-LABEL: DW_TAG_subprogram
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; DWARF: DW_AT_frame_base [DW_FORM_exprloc] (DW_OP_reg7 RSP)
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; DWARF: DW_AT_name [DW_FORM_strp] ( {{.*}}"f0")
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; DWARF: DW_TAG_formal_parameter
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; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_fbreg +8)
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; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}}"input")
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; Dynamic alloca forces the use of RBP as the base pointer
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; CHECK-LABEL: f1:
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; CHECK: pushq %rbp
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; CHECK: movl $42, %eax
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; CHECK: popq %rbp
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; CHECK: retq
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define i32 @f1(%struct.s* byval align 8 %input) !dbg !19 {
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%val = load i64, i64* @glob
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; this alloca should force FP usage.
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%stackspace = alloca i32, i64 %val, align 1
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store i32* %stackspace, i32** @ptr
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call void @llvm.dbg.declare(metadata %struct.s* %input, metadata !20, metadata !17), !dbg !21
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ret i32 42, !dbg !21
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}
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; DWARF-LABEL: DW_TAG_subprogram
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; DWARF: DW_AT_frame_base [DW_FORM_exprloc] (DW_OP_reg6 RBP)
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; DWARF: DW_AT_name [DW_FORM_strp] ( {{.*}}"f1")
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; DWARF: DW_TAG_formal_parameter
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; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_fbreg +16)
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; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}}"input")
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; CHECK-LABEL: f2:
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; Just check that we are indeed aligning the stack and setting up a base pointer
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; in RBX.
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; CHECK: pushq %rbp
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; CHECK: movq %rsp, %rbp
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; CHECK: pushq %rbx
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; CHECK: andq $-64, %rsp
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; CHECK: subq $64, %rsp
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; CHECK: movq %rsp, %rbx
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define i32 @f2(%struct.s* byval align 8 %input) !dbg !22 {
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%val = load i64, i64* @glob
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%stackspace = alloca i32, i64 %val, align 64
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store i32* %stackspace, i32** @ptr
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call void @llvm.dbg.declare(metadata %struct.s* %input, metadata !23, metadata !17), !dbg !24
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ret i32 42, !dbg !24
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}
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; "input" should still be referred to through RBP.
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; DWARF-LABEL: DW_TAG_subprogram
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; DWARF: DW_AT_frame_base [DW_FORM_exprloc] (DW_OP_reg6 RBP)
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; DWARF: DW_AT_name [DW_FORM_strp] ( {{.*}}"f2")
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; DWARF: DW_TAG_formal_parameter
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; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_fbreg +16)
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; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}}"input")
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declare void @llvm.dbg.declare(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!0, !1}
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!0 = !{i32 2, !"Dwarf Version", i32 4}
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!1 = !{i32 2, !"Debug Info Version", i32 3}
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, emissionKind: FullDebug)
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!3 = !DIFile(filename: "dbg-baseptr.ll", directory: "/")
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!4 = !DILocalVariable(name: "input", arg: 1, scope: !8, file: !3, line: 5, type: !9)
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!5 = !{}
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!6 = !DISubroutineType(types: !7)
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!7 = !{!10, !9}
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!8 = distinct !DISubprogram(name: "f0", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, unit: !2, retainedNodes: !5)
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!9 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "s", elements: !11)
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!10 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!11 = !{!12, !13, !14, !15, !16}
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!12 = !DIDerivedType(tag: DW_TAG_member, name: "a", baseType: !10, size: 32)
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "b", baseType: !10, size: 32, offset: 32)
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!14 = !DIDerivedType(tag: DW_TAG_member, name: "c", baseType: !10, size: 32, offset: 64)
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!15 = !DIDerivedType(tag: DW_TAG_member, name: "d", baseType: !10, size: 32, offset: 96)
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!16 = !DIDerivedType(tag: DW_TAG_member, name: "e", baseType: !10, size: 32, offset: 128)
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!17 = !DIExpression()
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!18 = !DILocation(line: 5, scope: !8)
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!19 = distinct !DISubprogram(name: "f1", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, unit: !2, retainedNodes: !5)
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!20 = !DILocalVariable(name: "input", arg: 1, scope: !19, file: !3, line: 5, type: !9)
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!21 = !DILocation(line: 5, scope: !19)
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!22 = distinct !DISubprogram(name: "f2", file: !3, line: 5, type: !6, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, unit: !2, retainedNodes: !5)
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!23 = !DILocalVariable(name: "input", arg: 1, scope: !22, file: !3, line: 5, type: !9)
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!24 = !DILocation(line: 5, scope: !22)
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