c395a84600
This change will allow to put code pointers in DWARF info fields that are larger than actual pointer size, e.g. 16-bit pointers into 32-bit fields. The need for this came up while creating support for MSP430 in LLDB. MSP430-GCC already generates DWARF info with 32-bit fields, so this change is necessary for LLDB to maintain compatibility with both GCC and LLVM binaries. Moreover, right now in LLDB there is no support for having DWARF pointer size different from ELF header type, e.g. 16-bit DWARF info within ELF32, and it seems there is no such thing as ELF16. Since other mainline targets are made to have the same pointer size in both MCAsmInfo and DataLayout, there is no need to change anything there. Reviewed By: dblaikie Differential Revision: https://reviews.llvm.org/D148042
137 lines
4.9 KiB
LLVM
137 lines
4.9 KiB
LLVM
; RUN: llc --filetype=obj -o %t < %s
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; RUN: llvm-dwarfdump --debug-info %t | FileCheck %s
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; RUN: llvm-dwarfdump --verify %t
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; This file was based on output of
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;
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; clang -target msp430 -S -emit-llvm -gdwarf-3 -Os dwarf-basics.c
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;
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; for the following dwarf-basics.c
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;
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; struct X {
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; void *a;
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; };
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;
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; int f(long y, struct X *p)
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; {
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; return 42;
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; }
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;
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; CHECK: file format elf32-msp430
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; CHECK: .debug_info contents:
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; CHECK: Compile Unit: length = 0x{{.*}}, format = DWARF32, version = 0x0003, abbr_offset = 0x0000, addr_size = 0x04 (next unit at 0x{{.*}})
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; CHECK: DW_TAG_compile_unit
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; CHECK: DW_AT_producer ("clang version 11.0.0 (git@...)")
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; CHECK: DW_AT_language (DW_LANG_C99)
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; CHECK: DW_AT_name ("dwarf-basics.c")
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; CHECK: DW_AT_stmt_list (0x{{.*}})
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; CHECK: DW_AT_comp_dir ("/tmp")
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; CHECK: DW_AT_low_pc (0x{{.*}})
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; CHECK: DW_AT_high_pc (0x{{.*}})
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_AT_low_pc (0x{{.*}})
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; CHECK: DW_AT_high_pc (0x{{.*}})
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; CHECK: DW_AT_frame_base (DW_OP_reg1 SP)
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; CHECK: DW_AT_name ("f")
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; CHECK: DW_AT_decl_file ("/tmp{{[/\\]}}dwarf-basics.c")
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; CHECK: DW_AT_decl_line (5)
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; CHECK: DW_AT_prototyped (0x01)
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; CHECK: DW_AT_type (0x{{.*}} "int")
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; CHECK: DW_AT_external (0x01)
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; CHECK: DW_TAG_formal_parameter
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; CHECK: DW_AT_location (0x{{.*}}:
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; CHECK: [0x00000000, 0x00000004): DW_OP_reg12 R12)
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; CHECK: DW_AT_name ("y")
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; CHECK: DW_AT_decl_file ("/tmp{{[/\\]}}dwarf-basics.c")
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; CHECK: DW_AT_decl_line (5)
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; CHECK: DW_AT_type (0x{{.*}} "long int")
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; CHECK: DW_TAG_formal_parameter
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; CHECK: DW_AT_location (DW_OP_reg14 R14)
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; CHECK: DW_AT_name ("p")
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; CHECK: DW_AT_decl_file ("/tmp{{[/\\]}}dwarf-basics.c")
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; CHECK: DW_AT_decl_line (5)
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; CHECK: DW_AT_type (0x{{.*}} "X *")
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; CHECK: NULL
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; CHECK: DW_TAG_base_type
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; CHECK: DW_AT_name ("int")
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; CHECK: DW_AT_encoding (DW_ATE_signed)
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; CHECK: DW_AT_byte_size (0x02)
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; CHECK: DW_TAG_base_type
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; CHECK: DW_AT_name ("long int")
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; CHECK: DW_AT_encoding (DW_ATE_signed)
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; CHECK: DW_AT_byte_size (0x04)
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; CHECK: DW_TAG_pointer_type
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; CHECK: DW_AT_type (0x{{.*}} "X")
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; CHECK: DW_TAG_structure_type
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; CHECK: DW_AT_name ("X")
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; CHECK: DW_AT_byte_size (0x02)
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; CHECK: DW_AT_decl_file ("/tmp{{[/\\]}}dwarf-basics.c")
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; CHECK: DW_AT_decl_line (1)
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; CHECK: DW_TAG_member
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; CHECK: DW_AT_name ("a")
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; CHECK: DW_AT_type (0x{{.*}} "void *")
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; CHECK: DW_AT_decl_file ("/tmp{{[/\\]}}dwarf-basics.c")
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; CHECK: DW_AT_decl_line (2)
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; CHECK: DW_AT_data_member_location (0)
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; CHECK: NULL
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; CHECK: DW_TAG_pointer_type
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; CHECK: NULL
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source_filename = "dwarf-basics.c"
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target datalayout = "e-m:e-p:16:16-i32:16-i64:16-f32:16-f64:16-a:8-n8:16-S16"
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target triple = "msp430"
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%struct.X = type { i8* }
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define i16 @f(i32 %y, %struct.X* %p) !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata i32 %y, metadata !18, metadata !DIExpression()), !dbg !20
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call void @llvm.dbg.value(metadata %struct.X* %p, metadata !19, metadata !DIExpression()), !dbg !20
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ret i16 42, !dbg !21
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 11.0.0 (git@...)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "dwarf-basics.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 3}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 2}
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!6 = !{!"clang version 11.0.0 (git@...)"}
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!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 5, type: !8, scopeLine: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !17)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !11, !12}
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!10 = !DIBasicType(name: "int", size: 16, encoding: DW_ATE_signed)
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!11 = !DIBasicType(name: "long int", size: 32, encoding: DW_ATE_signed)
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!12 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !13, size: 16)
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!13 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "X", file: !1, line: 1, size: 16, elements: !14)
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!14 = !{!15}
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!15 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !13, file: !1, line: 2, baseType: !16, size: 16)
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!16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 16)
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!17 = !{!18, !19}
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!18 = !DILocalVariable(name: "y", arg: 1, scope: !7, file: !1, line: 5, type: !11)
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!19 = !DILocalVariable(name: "p", arg: 2, scope: !7, file: !1, line: 5, type: !12)
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!20 = !DILocation(line: 0, scope: !7)
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!21 = !DILocation(line: 7, column: 3, scope: !7)
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