e8e9a33583
This adds support to help LLDB when binary is built with split dwarf, has .debug_names accelerator table and DWP file. Final linked binary might have Type Units (TUs) with the same type signature in multiple compilation units. Although the signature is the same, TUs are not guranted to be bit identical. This is not a problem when they are in .o/.dwo files as LLDB can find them by looking at the right one based on DW_AT_comp_dir/DW_AT_name in skeleton CU. Once DWP is created, TUs are de-duplicated, and we need to know from which CU remaining one came from. This approach allows LLDB to figure it out, with minimal changes to the rest of the tooling. As would have been the case if .debug_tu_index section in DWP was modified.
114 lines
4.7 KiB
LLVM
114 lines
4.7 KiB
LLVM
; RUN: llc -dwarf-version=4 -generate-type-units \
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; RUN: -filetype=obj -O0 -mtriple=x86_64-unknown-linux-gnu < %s \
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; RUN: | llvm-dwarfdump -v - | FileCheck %s --check-prefix=SINGLE-4
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; RUN: llc -split-dwarf-file=foo.dwo -split-dwarf-output=%t.dwo \
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; RUN: -dwarf-version=4 -generate-type-units \
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; RUN: -filetype=obj -O0 -mtriple=x86_64-unknown-linux-gnu < %s \
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; RUN: | llvm-dwarfdump -v - | FileCheck %s --check-prefix=O-4
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; RUN: llvm-dwarfdump -v %t.dwo | FileCheck %s --check-prefix=DWO-4
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; RUN: llc -dwarf-version=5 -generate-type-units \
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; RUN: -filetype=obj -O0 -mtriple=x86_64-unknown-linux-gnu < %s \
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; RUN: | llvm-dwarfdump -v - | FileCheck %s --check-prefix=SINGLE-5
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; RUN: llc -split-dwarf-file=foo.dwo -split-dwarf-output=%t.dwo \
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; RUN: -dwarf-version=5 -generate-type-units \
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; RUN: -filetype=obj -O0 -mtriple=x86_64-unknown-linux-gnu < %s \
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; RUN: | llvm-dwarfdump -v - | FileCheck %s --check-prefix=O-5
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; RUN: llvm-dwarfdump -v %t.dwo | FileCheck %s --check-prefix=DWO-5
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; Looking for DWARF headers to be generated correctly.
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; There are 8 variants with 5 formats: v4 CU, v4 TU, v5 normal/partial CU,
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; v5 skeleton/split CU, v5 normal/split TU. Some v5 variants differ only
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; in the unit_type code, and the skeleton/split CU differs from normal/partial
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; by having one extra field (dwo_id).
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; (v2 thru v4 CUs are all the same, and TUs were invented in v4,
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; so we don't bother checking older versions.)
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; Test case built from:
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;struct S {
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; int s1;
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;};
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;
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;S s;
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; Verify the v4 non-split headers.
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; Note that we check the exact offset of the DIEs because that tells us
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; the length of the header.
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;
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; SINGLE-4: .debug_info contents:
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; SINGLE-4: 0x00000000: Compile Unit: {{.*}} version = 0x0004, abbr_offset
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; SINGLE-4: 0x0000000b: DW_TAG_compile_unit
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;
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; SINGLE-4: .debug_types contents:
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; SINGLE-4: 0x00000000: Type Unit: {{.*}} version = 0x0004, abbr_offset
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; SINGLE-4: 0x00000017: DW_TAG_type_unit
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; Verify the v4 split headers.
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;
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; O-4: .debug_info contents:
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; O-4: 0x00000000: Compile Unit: {{.*}} version = 0x0004, abbr_offset
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; O-4: 0x0000000b: DW_TAG_compile_unit
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;
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; DWO-4: .debug_info.dwo contents:
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; DWO-4: 0x00000000: Compile Unit: {{.*}} version = 0x0004, abbr_offset
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; DWO-4: 0x0000000b: DW_TAG_compile_unit
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;
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; DWO-4: .debug_types.dwo contents:
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; DWO-4: 0x00000000: Type Unit: {{.*}} version = 0x0004, abbr_offset
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; DWO-4: 0x00000017: DW_TAG_type_unit
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; Verify the v5 non-split headers. Type units come first.
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; All .debug_info sections are reported in one go, but the offset resets for
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; each new section.
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;
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; SINGLE-5: .debug_info contents:
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; SINGLE-5: 0x00000000: Type Unit: {{.*}} version = 0x0005, unit_type = DW_UT_type, abbr_offset
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; SINGLE-5: 0x00000018: DW_TAG_type_unit
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; SINGLE-5-NOT: contents:
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; SINGLE-5: 0x00000000: Compile Unit: {{.*}} version = 0x0005, unit_type = DW_UT_compile, abbr_offset
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; SINGLE-5: 0x0000000c: DW_TAG_compile_unit
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; Verify the v5 split headers.
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;
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; O-5: .debug_info contents:
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; O-5: 0x00000000: Compile Unit: {{.*}} version = 0x0005, unit_type = DW_UT_skeleton, abbr_offset
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; O-5-SAME: DWO_id = 0xccd7e58ef8bf4aa6
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; O-5: 0x00000014: DW_TAG_skeleton_unit
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;
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; DWO-5: .debug_info.dwo contents:
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; DWO-5: 0x00000000: Type Unit: {{.*}} version = 0x0005, unit_type = DW_UT_split_type, abbr_offset
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; DWO-5: 0x00000018: DW_TAG_type_unit
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; DWO-5: 0x00000035: Compile Unit: {{.*}} version = 0x0005, unit_type = DW_UT_split_compile, abbr_offset
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; DWO-5-SAME: DWO_id = 0xccd7e58ef8bf4aa6
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; DWO-5: 0x00000049: DW_TAG_compile_unit
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; ModuleID = 't.cpp'
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source_filename = "t.cpp"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%struct.S = type { i32 }
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@s = global %struct.S zeroinitializer, align 4, !dbg !0
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!10, !11}
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!llvm.ident = !{!12}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "s", scope: !2, file: !3, line: 5, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 5.0.0 (trunk 295942)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "t.cpp", directory: "/home/probinson/projects/scratch")
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!4 = !{}
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!5 = !{!0}
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!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !3, line: 1, size: 32, elements: !7, identifier: "_ZTS1S")
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!7 = !{!8}
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!8 = !DIDerivedType(tag: DW_TAG_member, name: "s1", scope: !6, file: !3, line: 2, baseType: !9, size: 32)
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{!"clang version 5.0.0 (trunk 295942)"}
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