57a19ac336
The only change vs. the first version of the patch is that I've made DWARFUnit linking thread-safe/unit. This was necessary because, during the indexing step, two skeleton units could attempt to associate themselves with the split unit. The original commit message was: I ran into this when LTO completely emptied two compile units, so they ended up with the same hash (see #100375). Although, ideally, the compiler would try to ensure we don't end up with a hash collision even in this case, guaranteeing their absence is practically impossible. This patch ensures this situation does not bring down lldb.
143 lines
6.3 KiB
ArmAsm
143 lines
6.3 KiB
ArmAsm
## Test that lldb handles (mainly, that it doesn't crash) the situation where
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## two skeleton compile units have the same DWO ID (and try to claim the same
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## split unit from the DWP file. This can sometimes happen when the compile unit
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## is nearly empty (e.g. because LTO has optimized all of it away).
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# RUN: llvm-mc -triple=x86_64-pc-linux -filetype=obj %s --defsym MAIN=0 > %t
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# RUN: llvm-mc -triple=x86_64-pc-linux -filetype=obj %s > %t.dwp
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# RUN: %lldb %t -o "image lookup -t my_enum_type" \
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# RUN: -o "image dump separate-debug-info" -o exit | FileCheck %s
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## Check that we're able to access the type within the split unit (no matter
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## which skeleton unit it ends up associated with). Completely ignoring the unit
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## might also be reasonable.
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# CHECK: image lookup -t my_enum_type
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# CHECK: 1 match found
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# CHECK: name = "my_enum_type", byte-size = 4, compiler_type = "enum my_enum_type {
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# CHECK-NEXT: }"
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#
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## Check that we get some indication of the error.
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# CHECK: image dump separate-debug-info
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# CHECK: Dwo ID Err Dwo Path
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# CHECK: 0xdeadbeefbaadf00d E multiple compile units with Dwo ID 0xdeadbeefbaadf00d
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.set DWO_ID, 0xdeadbeefbaadf00d
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## The main file.
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.ifdef MAIN
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.section .debug_abbrev,"",@progbits
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.byte 1 # Abbreviation Code
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.byte 74 # DW_TAG_compile_unit
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.byte 0 # DW_CHILDREN_no
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.byte 0x76 # DW_AT_dwo_name
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.byte 8 # DW_FORM_string
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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_info,"",@progbits
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.irpc I,01
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.Lcu_begin\I:
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.long .Ldebug_info_end\I-.Ldebug_info_start\I # Length of Unit
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.Ldebug_info_start\I:
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.short 5 # DWARF version number
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.byte 4 # DWARF Unit Type
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.byte 8 # Address Size (in bytes)
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.long .debug_abbrev # Offset Into Abbrev. Section
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.quad DWO_ID # DWO id
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.byte 1 # Abbrev [1] DW_TAG_compile_unit
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.ascii "foo"
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.byte '0' + \I
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.asciz ".dwo\0" # DW_AT_dwo_name
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.Ldebug_info_end\I:
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.endr
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.else
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## DWP file starts here.
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.section .debug_abbrev.dwo,"e",@progbits
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.LAbbrevBegin:
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.byte 1 # Abbreviation Code
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.byte 17 # DW_TAG_compile_unit
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.byte 1 # DW_CHILDREN_yes
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.byte 37 # DW_AT_producer
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.byte 8 # DW_FORM_string
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.byte 19 # DW_AT_language
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.byte 5 # DW_FORM_data2
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 2 # Abbreviation Code
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.byte 4 # DW_TAG_enumeration_type
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.byte 0 # DW_CHILDREN_no
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.byte 3 # DW_AT_name
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.byte 8 # DW_FORM_string
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.byte 73 # DW_AT_type
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.byte 19 # DW_FORM_ref4
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.byte 11 # DW_AT_byte_size
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.byte 11 # DW_FORM_data1
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.byte 0 # EOM(1)
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.byte 0 # EOM(2)
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.byte 4 # Abbreviation Code
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.byte 36 # DW_TAG_base_type
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.byte 0 # DW_CHILDREN_no
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.byte 3 # DW_AT_name
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.byte 8 # DW_FORM_string
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.byte 62 # DW_AT_encoding
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.byte 11 # DW_FORM_data1
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.byte 11 # DW_AT_byte_size
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.byte 11 # DW_FORM_data1
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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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.LAbbrevEnd:
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.section .debug_info.dwo,"e",@progbits
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.LCUBegin:
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.Lcu_begin1:
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.long .Ldebug_info_end1-.Ldebug_info_start1 # Length of Unit
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.Ldebug_info_start1:
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.short 5 # DWARF version number
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.byte 5 # DWARF Unit Type
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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 DWO_ID # DWO id
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.byte 1 # Abbrev [1] DW_TAG_compile_unit
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.asciz "Hand-written DWARF" # DW_AT_producer
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.short 12 # DW_AT_language
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.byte 2 # Abbrev [2] DW_TAG_enumeration_type
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.asciz "my_enum_type" # DW_AT_name
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.long .Lint-.Lcu_begin1 # DW_AT_type
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.byte 4 # DW_AT_byte_size
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.Lint:
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.byte 4 # Abbrev [4] DW_TAG_base_type
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.asciz "int" # DW_AT_name
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.byte 5 # DW_AT_encoding
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.byte 4 # DW_AT_byte_size
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.byte 0 # End Of Children Mark
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.Ldebug_info_end1:
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.LCUEnd:
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.section .debug_cu_index, "", @progbits
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## Header:
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.short 5 # Version
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.short 0 # Padding
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.long 2 # Section count
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.long 1 # Unit count
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.long 2 # Slot count
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## Hash Table of Signatures:
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.quad 0
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.quad DWO_ID
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## Parallel Table of Indexes:
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.long 0
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.long 1
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## Table of Section Offsets:
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## Row 0:
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.long 1 # DW_SECT_INFO
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.long 3 # DW_SECT_ABBREV
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## Row 1:
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.long 0 # Offset in .debug_info.dwo
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.long 0 # Offset in .debug_abbrev.dwo
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## Table of Section Sizes:
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.long .LCUEnd-.LCUBegin # Size in .debug_info.dwo
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.long .LAbbrevEnd-.LAbbrevBegin # Size in .debug_abbrev.dwo
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.endif
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