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
71 lines
3.6 KiB
LLVM
71 lines
3.6 KiB
LLVM
; RUN: llc -filetype=obj -O0 < %s -mtriple sparc64-unknown-linux-gnu | llvm-dwarfdump -v - | FileCheck %s --check-prefix=SPARC64
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; RUN: llc -filetype=obj -O0 < %s -mtriple sparc-unknown-linux-gnu | llvm-dwarfdump -v - | FileCheck %s --check-prefix=SPARC32
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; Check for DW_CFA_GNU_Window_save in debug_frame. Also, Ensure that relocations
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; are performed correctly in debug_info.
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; SPARC64: file format ELF64-sparc
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; SPARC64: .debug_info
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; SPARC64: DW_TAG_compile_unit
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; SPARC64: DW_AT_name [DW_FORM_strp] ( .debug_str[0x{{[0-9,A-F,a-f]+}}] = "hello.c")
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; SPARC64: DW_TAG_subprogram
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; SPARC64: DW_AT_name [DW_FORM_strp] ( .debug_str[0x{{[0-9,A-F,a-f]+}}] = "main")
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; SPARC64: DW_TAG_base_type
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; SPARC64: DW_AT_name [DW_FORM_strp] ( .debug_str[0x{{[0-9,A-F,a-f]+}}] = "int")
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; SPARC64: .debug_frame
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; SPARC64: DW_CFA_def_cfa_register
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; SPARC64-NEXT: DW_CFA_GNU_window_save
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; SPARC64-NEXT: DW_CFA_register
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; SPARC32: file format ELF32-sparc
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; SPARC32: .debug_info
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; SPARC32: DW_TAG_compile_unit
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; SPARC32: DW_AT_name [DW_FORM_strp] ( .debug_str[0x{{[0-9,A-F,a-f]+}}] = "hello.c")
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; SPARC32: DW_TAG_subprogram
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; SPARC32: DW_AT_name [DW_FORM_strp] ( .debug_str[0x{{[0-9,A-F,a-f]+}}] = "main")
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; SPARC32: DW_TAG_base_type
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; SPARC32: DW_AT_name [DW_FORM_strp] ( .debug_str[0x{{[0-9,A-F,a-f]+}}] = "int")
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; SPARC32: .debug_frame
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; SPARC32: DW_CFA_def_cfa_register
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; SPARC32-NEXT: DW_CFA_GNU_window_save
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; SPARC32-NEXT: DW_CFA_register
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@.str = private unnamed_addr constant [14 x i8] c"hello, world\0A\00", align 1
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; Function Attrs: nounwind
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define signext i32 @main() #0 !dbg !4 {
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entry:
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%retval = alloca i32, align 4
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store i32 0, i32* %retval
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%call = call signext i32 (i8*, ...) @printf(i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i32 0, i32 0)), !dbg !12
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ret i32 0, !dbg !13
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}
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declare signext i32 @printf(i8*, ...) #1
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attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "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"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 (http://llvm.org/git/clang.git 6a0714fee07fb7c4e32d3972b4fe2ce2f5678cf4) (llvm/ 672e88e934757f76d5c5e5258be41e7615094844)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "hello.c", directory: "/home/venkatra/work/benchmarks/test/hello")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "main", line: 3, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 4, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "hello.c", directory: "/home/venkatra/work/benchmarks/test/hello")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !{i32 2, !"Dwarf Version", i32 4}
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!10 = !{i32 1, !"Debug Info Version", i32 3}
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!11 = !{!"clang version 3.5 (http://llvm.org/git/clang.git 6a0714fee07fb7c4e32d3972b4fe2ce2f5678cf4) (llvm/ 672e88e934757f76d5c5e5258be41e7615094844)"}
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!12 = !DILocation(line: 5, scope: !4)
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!13 = !DILocation(line: 6, scope: !4)
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