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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
61 lines
2.9 KiB
LLVM
61 lines
2.9 KiB
LLVM
; Verify target-based defaults for "debugger tuning," and the ability to
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; override defaults.
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; We use the DW_AT_APPLE_optimized attribute and the DW_OP_form_tls_address
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; vs. DW_OP_GNU_push_tls_address opcodes to distinguish the debuggers.
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; Verify defaults for various targets.
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; RUN: llc -mtriple=x86_64-scei-ps4 -filetype=obj < %s | llvm-dwarfdump -debug-info - | FileCheck --check-prefix=SCE %s
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; RUN: llc -mtriple=x86_64-apple-darwin12 -filetype=obj < %s | llvm-dwarfdump -debug-info - | FileCheck --check-prefix=LLDB %s
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; RUN: llc -mtriple=x86_64-pc-freebsd -filetype=obj < %s | llvm-dwarfdump -debug-info - | FileCheck --check-prefix=GDB %s
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; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj < %s | llvm-dwarfdump -debug-info - | FileCheck --check-prefix=GDB %s
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; We can override defaults.
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; RUN: llc -mtriple=x86_64-scei-ps4 -filetype=obj -debugger-tune=gdb < %s | llvm-dwarfdump -debug-info - | FileCheck --check-prefix=GDB %s
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; RUN: llc -mtriple=x86_64-pc-linux -filetype=obj -debugger-tune=lldb < %s | llvm-dwarfdump -debug-info - | FileCheck --check-prefix=LLDB %s
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; RUN: llc -mtriple=x86_64-apple-darwin12 -filetype=obj -debugger-tune=sce < %s | llvm-dwarfdump -debug-info - | FileCheck --check-prefix=SCE %s
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; GDB-NOT: DW_AT_APPLE_optimized
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; GDB-NOT: DW_OP_form_tls_address
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; LLDB: DW_AT_APPLE_optimized
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; LLDB: DW_OP_form_tls_address
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; SCE-NOT: DW_AT_APPLE_optimized
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; SCE-NOT: DW_OP_GNU_push_tls_address
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@var = thread_local global i32 0, align 4, !dbg !0
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; Function Attrs: norecurse nounwind readnone uwtable
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define void @_Z3funv() local_unnamed_addr #0 !dbg !11 {
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ret void, !dbg !14
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}
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; Function Attrs: norecurse uwtable
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define weak_odr hidden i32* @_ZTW3var() local_unnamed_addr #1 {
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ret i32* @var
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}
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attributes #0 = { norecurse nounwind readnone uwtable }
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attributes #1 = { norecurse uwtable }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7, !8, !9}
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!llvm.ident = !{!10}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "var", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 7.0.0 (trunk 322268) (llvm/trunk 322267)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "debugger-tune.cpp", directory: "/tmp")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 4}
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!10 = !{!"clang version 7.0.0 (trunk 322268) (llvm/trunk 322267)"}
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!11 = distinct !DISubprogram(name: "fun", linkageName: "_Z3funv", scope: !3, file: !3, line: 2, type: !12, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !4)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null}
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!14 = !DILocation(line: 2, column: 13, scope: !11)
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