c0db062277
According to DWARF5 specification and gnu specification for DWARF4 the offset entry in the CU/TU Index is 32 bits. This presents a problem when .debug_info.dwo in DWP file grows beyond 4GB. The CU Index becomes partially corrupted. This diff adds manual parsing of .debug_info.dwo/.debug_abbrev.dwo to reconstruct CU index in general, and TU index for DWARF5. This is a work around until DWARF6 spec is finalized. Next patch will change internal CU/TU struct to 64 bit, and change uses as necessary. The plan is to land all the patches in one go after all are approved. This patch originates from the discussion in: https://discourse.llvm.org/t/dwarf-dwp-4gb-limit/63902 Reviewed By: dblaikie Differential Revision: https://reviews.llvm.org/D137882
60 lines
3.3 KiB
ArmAsm
60 lines
3.3 KiB
ArmAsm
# This test checks the support for writing macro sections and their index (v5).
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# RUN: llvm-mc -triple x86_64-unknown-linux --filetype=obj --split-dwarf-file=%t.dwo -dwarf-version=5 %s -o %t.o
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# RUN: llvm-dwp %t.dwo -o %t.dwp 2>&1
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# RUN: llvm-dwarfdump -debug-macro -debug-cu-index %t.dwp | FileCheck -check-prefix=CHECK %s
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# RUN: llvm-dwarfdump -debug-macro -debug-cu-index -manaully-generate-unit-index %t.dwp | FileCheck -check-prefix=CHECK2 %s
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# CHECK-DAG: .debug_macro.dwo contents:
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# CHECK: macro header: version = 0x0005, flags = 0x00, format = DWARF32
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# CHECK-NEXT: DW_MACRO_start_file - lineno: 0 filenum: 0
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# CHECK-NEXT: DW_MACRO_define_strx - lineno: 1 macro: x 5
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# CHECK-NEXT: DW_MACRO_end_file
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# CHECK-DAG: .debug_cu_index contents:
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# CHECK-NEXT: version = 5, units = 1, slots = 2
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# CHECK: Index Signature INFO ABBREV STR_OFFSETS MACRO
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# CHECK: 1 0x0000000000000000 [0x0000000000000000, 0x0000000000000019) [0x00000000, 0x00000008) [0x00000000, 0x0000000c) [0x00000000, 0x0000000b)
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# CHECK2: Index Signature INFO ABBREV STR_OFFSETS MACRO
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# CHECK2: 1 0x0000000000000000 [0x0000000000000000, 0x0000000000000019) [0x00000000, 0x00000008) [0x00000000, 0x0000000c) [0x00000000, 0x0000000b)
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.section .debug_info.dwo,"e",@progbits
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.long .Ldebug_info_dwo_end0-.Ldebug_info_dwo_start0 # Length of Unit
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.Ldebug_info_dwo_start0:
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.short 5 # DWARF version number
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.byte 5 # DWARF Unit Type (DW_UT_split_compile)
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.byte 8 # Address Size (in bytes)
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.long 0 # Offset Into Abbrev. Section
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.quad 0
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.byte 1 # Abbrev [1] 0x14:0x5 DW_TAG_compile_unit
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.long 0 # DW_AT_macros
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.Ldebug_info_dwo_end0:
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.section .debug_macro.dwo,"e",@progbits
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.short 5 # Macro information version
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.byte 0 # Flags: 32 bit
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.byte 3 # DW_MACRO_start_file
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.byte 0 # Line Number
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.byte 0 # File Number
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.byte 11 # DW_MACRO_define_strx
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.byte 1 # Line Number
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.byte 0 # Macro String
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.byte 4 # DW_MACRO_end_file
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.byte 0 # End Of Macro List Mark
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.section .debug_abbrev.dwo,"e",@progbits
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.byte 1 # Abbreviation Code
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.byte 17 # DW_TAG_compile_unit
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.byte 0 # DW_CHILDREN_no
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.byte 121 # DW_AT_macros
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.byte 23 # DW_FORM_sec_offset
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 0 # EOM(3)
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.section .debug_str.dwo,"eMS",@progbits,1
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.asciz "x 5" # string offset=0
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.section .debug_str_offsets.dwo,"e",@progbits
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.long 8 # Length of String Offsets Set
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.short 5
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.short 0
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.long 0
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