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c8fe2424ea
Summary: Both (Apple and DWARF5) implementations of the iterators had bugs which resulted in crashes if one attempted to iterate through the accelerator tables all the way. For the Apple tables, the issue was that we did not clear the DataOffset field when we reached the end, which made our iterator compare unequal to the "end" iterator. For the Dwarf5 tables, the problem was that we incremented the CurrentIndex pointer and then used the incremented (possibly invalid) pointer to check whether we have reached the end of the index list. The reason these bugs went undetected is because their only user (dwarfdump) only ever searched for the first match. Besides allowing us to test this fix, changing llvm-dwarfdump --find to display all matches seems like a good improvement (it makes the behavior consistent with the --name option), so I change llvm-dwarfdump to do that. The existing tests would be sufficient to test this fix with the new llvm-dwarfdump behavior, but I add a special test that demonstrates that the tool indeed displays multiple results. The find.test test needed to be tweaked a bit as the tool now does not print the ".debug_info contents" header (also consistent with how --name works). Reviewers: JDevlieghere, aprantl, dblaikie Subscribers: mgrang, llvm-commits Differential Revision: https://reviews.llvm.org/D47543 llvm-svn: 333635
93 lines
3.6 KiB
ArmAsm
93 lines
3.6 KiB
ArmAsm
# RUN: llvm-mc -triple x86_64-pc-linux %s -filetype=obj -o %t
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# RUN: llvm-dwarfdump -find=foo - <%t | FileCheck %s
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# CHECK: 12: DW_TAG_subprogram
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# CHECK-NEXT: DW_AT_name ("foo")
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# CHECK-NEXT: DW_AT_external
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# CHECK: 17: DW_TAG_subprogram
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# CHECK-NEXT: DW_AT_name ("foo")
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# CHECK-NEXT: DW_AT_external
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.section .debug_str,"MS",@progbits,1
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.Lstring_foo:
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.asciz "foo"
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.Lstring_producer:
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.asciz "Hand-written dwarf"
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.section .debug_abbrev,"",@progbits
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.Lsection_abbrev:
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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 14 # DW_FORM_strp
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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 46 # DW_TAG_subprogram
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.byte 0 # DW_CHILDREN_no
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.byte 3 # DW_AT_name
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.byte 14 # DW_FORM_strp
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.byte 63 # DW_AT_external
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.byte 25 # DW_FORM_flag_present
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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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.Lcu_begin0:
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.long .Lcu_end0-.Lcu_start0 # Length of Unit
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.Lcu_start0:
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.short 4 # DWARF version number
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.long .Lsection_abbrev # Offset Into Abbrev. Section
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.byte 8 # Address Size (in bytes)
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.byte 1 # Abbrev [1] DW_TAG_compile_unit
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.long .Lstring_producer # DW_AT_producer
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.short 12 # DW_AT_language
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.Ldie_foo:
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.byte 2 # Abbrev [2] DW_TAG_subprogram
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.long .Lstring_foo # DW_AT_name
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# DW_AT_external
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.Ldie_foo2:
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.byte 2 # Abbrev [2] DW_TAG_subprogram
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.long .Lstring_foo # DW_AT_name
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# DW_AT_external
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.byte 0 # End Of Children Mark
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.Lcu_end0:
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.section .debug_names,"",@progbits
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.long .Lnames_end0-.Lnames_start0 # Header: contribution length
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.Lnames_start0:
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.short 5 # Header: version
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.short 0 # Header: padding
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.long 1 # Header: compilation unit count
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.long 0 # Header: local type unit count
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.long 0 # Header: foreign type unit count
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.long 0 # Header: bucket count
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.long 1 # Header: name count
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.long .Lnames_abbrev_end0-.Lnames_abbrev_start0 # Header: abbreviation table size
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.long 0 # Header: augmentation length
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.long .Lcu_begin0 # Compilation unit 0
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.long .Lstring_foo # String in Bucket 0: foo
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.long .Lnames0-.Lnames_entries0 # Offset in Bucket 0
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.Lnames_abbrev_start0:
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.byte 46 # Abbrev code
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.byte 46 # DW_TAG_subprogram
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.byte 3 # DW_IDX_die_offset
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.byte 19 # DW_FORM_ref4
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.byte 0 # End of abbrev
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.byte 0 # End of abbrev
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.byte 0 # End of abbrev list
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.Lnames_abbrev_end0:
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.Lnames_entries0:
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.Lnames0:
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.byte 46 # Abbrev code
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.long .Ldie_foo-.Lcu_begin0 # DW_IDX_die_offset
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.byte 46 # Abbrev code
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.long .Ldie_foo2-.Lcu_begin0 # DW_IDX_die_offset
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.long 0 # End of list: foo
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.p2align 2
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.Lnames_end0:
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