File: ChangeLog2016

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dwarfutils 20180809-1
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2016-12-25 David Anderson
    * dwarf.h: DWARF5 changed DW_FORM_ref_sup to DW_FORM_ref_sup4
      and added DW_FORM_ref_sup8.
2016-12-20 David Anderson
    * libdwarfdefs.h: Removed definition of SHF_COMPRESSED.
      There was no reason to define it early in a local header file.
    * dwarf_init_finish.c: Added definition of SHF_COMPRESSED.
      Making it a late definition avoids a conflict with Centos-7.3.
2016-12-06 David Anderson
    * dwarf.h: Comments mention certain values unused in
      DWARF2 and later as being from DWARF1.
2016-11-24 David Anderson
    * libdwarf/gennames.c: Update version string.
2016-11-24 David Anderson
    * Makefile.in: Clean *~
2016-11-16 David Anderson
    * dwarf_die_deliv.c(dwarf_child): Added a check for 'at end of DIEs',
      removed pointless parens in returns, and added {} to make an if()
      follow normal form.
    * dwarf_query.c: Removed pointless parens in return.
    * dwarf_util.c(_dwarf_get_size_of_val): Changed return 0
      to return DW_DLV_OK so it reads as is supposed to.
      For DW_FORM_block1 check a pointer for validity before
      dereferencing. In  _dwarf_check_string_valid() added
      comments clarifying the intent of the function.
2016-11-11 David Anderson
    * dwarf_init_finish.c: Remove a few bytes of trailing whitespace.
    * dwarf_leb.c(_dwarf_decode_s_leb128_chk): Now we avoid 
      using code with undefined behavior. And add new test cases
      in the #ifdef TESTING code that shows the problem is fixed.
2016-11-04 David Anderson
    * libdwarf.h.in: Removed trailing whitespace, three places.
      Added DW_DLE_ZLIB_UNCOMPRESS_ERROR.
    * dwarf_arange.c(dwarf_get_aranges_list): Add checks for the sanity
      of aranges headers and values to catch corrupted dwarf..
    * dwarf_errmsg_list.c: Add DW_DLE_ZLIB_UNCOMPRESS_ERROR to
      identify impossible zlib compression.
    * dwarf_form.c:(dwarf_formblock): Check for overrun of
      a section-end. Return witw DW_DLE_FORM_BLOCK_LENGTH_ERROR as
      the error when such corrupt dwarf is encountered.
    * dwarf_init_finish.c(do_decompress_zlib): Check for corrupted
      zlib compression information and set  DW_DLE_ZLIB_UNCOMPRESS_ERROR
      when a corrupted expanded-length is found.
    * dwarf_macro5.c(_dwarf_skim_forms): For DW_FORM_STRING call
      _dwarf_check_string_valid() to ensure a string does not
      run off the end of a malloc block.
    * dwarf_util.c(_dwarf_check_string_valid): Remove and add
      a blank line to get the usual way functions begin with
      declarations, a blank line, then code. No change in logic.
2016-11-01 David Anderson
    * dwarf.h: Adding Ada GNAT gcc attributes DW_AT_GNU_numerator,
      DW_AT_GNU_denominator, DW_AT_GNU_bias.
2016-10-21 David Anderson
    * gennames.c: Update version string.
2016-10-15 David Anderson
    * libdwarf.h.in: Added DWARF5 values
      to enum Dwarf_Form_Class.
    * dwarf_query.c(dwarf_get_form_class): Added DWARF5 support.
2016-10-11 David Anderson
    * pro_forms.c, pro_section.c: Restoring DW_AT_MIPS_linkage_name
      and DW_AT_MIPS_abstract_name (lost by accident in July 2007)
      and adding DW_AT_linkage_name (DWARF5, but usable in
      earlier DWARF versions if you wish to use it).
2016-10-07 David Anderson
    * libdwarf2p.1.mm: Improved the documentation of
      dwarf_pro_set_default_string_form().
    * libdwarf2p.1.pdf: Version 1.46. Regenerated.
    * pro_die.c: Now the code allows modification
      of the start of real strings in .debug_str easily. 
      Was a bit brittle before, allowed offset of 1 to work
      but not zero.
    * pro_opaque.h: Add dse_has_table_offset member to
      eliminate brittleness in the logic for .debug_str.
    * pro_init.c: Use dse_has_table_offset member to
      eliminate brittleness in the logic for .debug_str.
2016-10-04 David Anderson
    * dwarf_elf_access.c: Remove trailing whitespace.
    * dwarf_form.c: Fix an indent.
    * dwarf_init_finish.c: Comment the #if 0 so it is clear
      these are for debugging only.
    * dwarf_leb.c: Remove trailing whitespace.
    * dwarf_line.c: Remove unused #if 0/#endif code.
    * dwarf_macro5.c: Remove some obsolete #if 0 code.
      Comment the remaining #if 0 so it is clear
      these are for debugging only.
      Remove trailing whitespace.
    * dwarf_util.h: Delete obsolete #if 0 macro.
    * dwgetopt.c: Comment the #if 0 so it is clear
      these are for debugging only.
    * pro_frame.h: Delete never-used #if 0 macro.
2016-10-04 David Anderson
    * dwarf_util.c(_dwarf_check_string_valid):
      removed accidental test code.
2016-10-04 David Anderson
    * dwarf_leb.c: The 'make tests' test code had some
      warnings, which are now fixed. 
    * libdwarf.h.in: Adding error codes.
    * dwarf_util.c(_dwarf_check_string_valid): Uses passed-in error
      code in case pointer out of bounds.
      _dwarf_get_size_of_val now calls _dwarf_check_string_valid()
      on a DW_FORM_string.
    * dwarf_util.h: _dwarf_check_string_valid() interface changed.
    * dwarf_errmsg_list.c: Adding error codes.
    * dwarf_form.c, dwarf_frame2.c, dwarf_global.c,
      dwarf_line.c, dwarf_line_table_reader_common.c,
      dwarf_macro.c, dwarf_macro5.c,  dwarf_string.c:
      Using the new _dwarf_check_string_valid interface and
      new error codes.
    * dwarf_elf_access.c: Added commentary about a libelf call
      and possible outcomes.
2016-10-03 David Anderson
    * Makefile.in: Now run tests at build time to ensure DW_DLE macros correct.
    * dwarf_errmsg_list.c: Add new error code and add test code to verify
      DW_DLE_ macros specified correctly.
    * dwarf_sort_line.c: While this file is not used, for consistency
      it uses the checking macros so deleting the non-checking ones
      would not look odd.
    * dwarf_util.c: Add a check for running off end of abbreviation data
      at a spot that was missed till now.
    * dwarf_util.h: Delete unused non-checking DECODE_LEB128_UWORD and
      DECODE_LEB128_SWORD and SKIP_LEB128_WORD macros.
    * libdwarf.h.in: Add DW_DLE_ABBREV_OFF_END and correct
      the numbering (again). Now critical parts 
      are checked at build time.
2016-09-30 David Anderson
    * dwarf_leb.c: One comparison was accidentally
      signed vs unsigned. Now both unsigned.
2016-09-30 David Anderson
    * Makefile.in: Ensure test executable removed by make clean.
2016-09-30 David Anderson
    * dwarf_leb.c: Fix decode and encode leb to avoid
      runtime warning from left-shift signed value,
      we got into undefined behavior.
      Add test code used by 'make tests'.
    * Makefile.in: Add leb testing to 'make tests'
    * configure.in: Add additional -fsanitize tests.
    * configure: Regenerated.
2016-09-28 David Anderson
    * dwarf_opaque.h: New interface for
      _dwarf_extract_string_offset_via_str_offsets().
      Remove duplicate declaration of the function.
    * dwarf_form.c(_dwarf_extract_string_offset_via_str_offsets): 
      Had a test for end of section
      on what was sometimes the wrong section. 
      Now section end passed in and correct.
      Depending on circumstances such
      as where elf data was in memory, the
      result was a single regression test would 
      get a DW_DLE_LEB_IMPROPER
      error ... or not get it.
    * dwarf_macro5.c: A test for DW_DLV_OK was testing the
      wrong local variable.  
2016-09-28 David Anderson
    * dwarf_errmsg_list.c: Added error codes for
      duplicated DWARF5 .debug_loclists and .debug_rnglists
      sections. 
    * dwarf_init_finish.c: Adds incomplete support for
      DWARF5 .debug_names.c, .debug_loclists, and .debug_rnglists
      Adds dwarf_get_section_max_offsets_d() to return all the possible
      DWARF section sizes across all DWARF2..5
    * dwarf_line_table_reader_common.c: DW_LNCT renamed as
      DW_LNCT_GNU as the DWARF5 standard has some differences
      from the experimental version (no named)DW_LNCT_GNU.
    * dwarf_loc2.c: Renames DW_LLE to DW_LLEX as these are
      the non-standard experimental version (not the same
      as the DWARF5 standard).
    * dwarf_opaque.h: Updated version number comments.
      Added new section support data in Dwarf_Debug_s.
    * dwarf_ranges.c(dwarf_get_ranges_a):  deleted unused local variable.
    * libdwarf.h.in: New error codes. Declaration for
      dwarf_get_section_max_offsets_d() added.
      Now has all the DWARF5 dwarf_get_*_name() function declarations too.
    * dwarf_error.h: Deleted two unwanted blank lines.
2016-09-28 David Anderson
    * gennames.c: Now the comparison function to qsort
      guarantees a stable sort by also referencing the
      original array location (a new data item 
      in the struct).  Needed for  consistent
      output.
2016-09-28 David Anderson
    * dwarf_alloc.c: Special function 
      _dwarf_special_no_dbg_error_malloc() was failing
      to return a value. Serious bug. Now it returns
      a value.
2016-09-27 David Anderson
    * dwarf.h: The previous experimental DW_LLE_
      non-standard names are renamed as DW_LLEX_
      temporarily. Do not use the LLEX names.
2016-09-27 David Anderson
    * dwarf.h: Added commentary about DW_children_yes[no] which
      are non-standard. Use DW_CHILDREN_yes[no] instead.
2016-09-27 David Anderson
    * dwarf.h: Update with the probably-final DWARF5
      tags, attributes, etc.
2016-09-26 David Anderson
    * dwarf_query.c: Removed four lines of code associated with 
      DWARF5 DW_MACRO_define_strx that
      should not have existed.
      There are as yet no testcases using strx, though
      one fuzzed testcase (liu/NULLdereference0519.elf)
      made it appear such was in use.
2016-09-25 David Anderson
    * dwarf_opaque.h: Accidentally had a function pointer
      definition _dwarf_get_elf_flags_func_ptr but now has a
      typedef of _dwarf_get_elf_flags_func_ptr_type instead. 
    * dwarf_init_finish.c: Add definition of _dwarf_get_elf_flags_func.
2016-09-23 David Anderson
    * gennames.c: gennames -t generated incorrect tables. 
      gcc -fsanitize=address noticed out of bounds references
      in the generated code. The code has been wrong for quite a while.
      It's likely no one was using the table form, gennames -s
      is generally better to use anyway.
    * pro_frame.c: Was using strdup() and now uses _dwarf_p_get_alloc()
      and strcpy() so we do not leak a string.
2016-09-22 David Anderson
    * dwarf_abbrev.c: Was calling _dwarf_error() with NULL dbg
      when a real dbg was available. fixed.
    * dwarf_alloc.c: Was testing for the static DW_DLA_ERROR
      too late in dwarf_dealloc(). So the address sanitizer reported the 
      erroneous address calculation that resulted.
    * dwarf_error.c,dwarf_error.h: Now  DE_STANDARD,DE_STATIC,DE_MALLOC
      let dwarf_dealloc free up Dwarf_Error resources properly.
2016-09-22 David Anderson
    * dwarf_ranges.c: dwarf_get_ranges_a() was allocating at the wrong
      place and not freeing all it should.
2016-09-21 David Anderson
    * dwarf_errmsg_list.c,libdwarf.h.in: Added DW_DLE_LINE_TABLE_BAD.
    * dwarf_line_table_reader_common.c: Added tests to prevent running
      off end of line table. Second commit is fix 3 line indent error.
2016-09-21 David Anderson
    * configure.in: Support --enable-sanitize
    * configure: Regenerated.
    * dwarf_alloc.c: Rearrange DW_DLA_STRING check to avoid
      calculating and using an address that may not exist.
      And check earlier for a NULL dbg.
    * dwarf_die_deliv.c: Add offset and length checks to catch
      corrupt dwarf.
    * dwarf_errmsg_list.c: Add DW_DLE_LOCLIST_OFFSET_BAD error code.
    * dwarf_form.c: Delete three completely blank lines for
      consistency in formatting..
    * dwarf_loc.c: Add offset and length checks to catch
      corrupt dwarf. Correct the initialization of loc_section_end
      in _dwarf_read_loc_section().
    * dwarf_ranges.c: Add free() in two places to avoid
      memory leak.
    * dwarf_util.c: Add length error checks for DW_FORM_block* .
      Correct initialization of end_abbrev_ptr in
      _dwarf_get_abbrev_for_code().
    * libdwarf.h.in: Add DW_DLE_LOCLIST_OFFSET_BAD.
2016-09-17 David Anderson
    * libdwarf.h.in: Added error code DW_DLE_SIBLING_LIST_IMPROPER.
    * dwarf_errmsg_list.c: Added DW_DLE_SIBLING_LIST_IMPROPER.
    * dwarf_die_deliv.c: Vulnerability DW201609-001.
      Added a check to catch invalid DWARF instead of
      reading a byte inappropriately (that might not even
      be addressable).
      The error code generated is DW_DLE_SIBLING_LIST_IMPROPER.
2016-09-15 David Anderson
    * configure.in: Add check for unistd.h .
    * configure: Regenerated.
    * gennames.c: Add HAVE_UNISTD_H check for the include
      of unistd.h.
2016-09-15 David Anderson
    * dwarf_elf_access.c: Depends on libelf.h, so if libelf.h
      is missing (as shown in the generated config.h)
      the compile stops with an error.
2016-09-15 David Anderson
    * libdwarf.h.in: New interface functions
      dwarf_producer_finish_a() and
      dwarf_add_die_to_debug_a()
      declared, providing libdwarf-standard 
      int return value.      
    * libdwarf2p.1.mm: Document dwarf_producer_finish_a()
      and dwarf_add_die_to_debug_a().
    * libdwarf2p.1.pdf: Regenerated. Rev 1.45. 
    * pro_init.c: Remove use of C99 type uint32_t
      and use DW_TSHASHTYPE instead.
    * pro_finish.c: Implement dwarf_producer_finish_a().
    * pro_die.c: Implement dwarf_add_die_to_debug_a().
2016-09-14 David Anderson
    * dwarf_dsc.h: Removed accidental typedef redeclaration
      of Dwarf_Dsc_Head: it is already in libdwarf.h and
      FreeBSD compiler complained.
    * pro_section.c: Removed trailing whitespace from three lines.
      Fixed indentation on one line.
2016-09-13 David Anderson
    * pro_section.c: new interface dwarf_get_section_bytes_a().
    * libdwarf.h.in: Declaration for dwarf_get_section_bytes_a() added.
    * libdwarf2p.1.mm: Document dwarf_get_section_bytes_a().
    * libdwarf2p.1.pdf: Regenerated. Rev 1.44. 
2016-09-12 David Anderson
    * libdwarf.h.in: Declaring dwarf_new_die_a()
      and dwarf_die_link_a().
      Renamed yesterday's new function dwarf_transform_to_disk_form_b() to
      dwarf_transform_to_disk_form_a() for consistency
      with the new dwarf_new_die_a().
    * pro_die.c: Implementing dwarf_new_die_a()
      and dwarf_die_link_a() with easier to use
      error handling than dwarf_new_die()
      and dwarf_die_link().
    * libdwarf2p.1.mm: Document the new and renamed *_a() functions.
    * libdwarf2p.1.pdf: Regenerated. Rev 1.43. 
2016-09-11 David Anderson
    * dwarf_errmsg_list.c: Adding DW_DLE_LEB_OUT_ERROR.
    * libdwarf.h.in: Adding DW_DLE_LEB_OUT_ERROR
      and dwarf_transform_to_disk_form_b(), first steps
      to making type-safe producer functions.
    * libdwarf2p.1.mm: Document dwarf_transform_to_disk_form_b().
    * libdwarf2p.1.pdf: Rev 1.42. 
    * pro_arange.c: Altered internal interface to _dwarf_transform_arange_to_disk().
    * pro_die.c: Altered internal error return to use DW_DLV_ERROR.
    * pro_macinfo.c,pro_macinfo.h: Altered internal interface to
      _dwarf_pro_transform_macro_info_to_disk().
    * pro_section.c: Implemented dwarf_transform_to_disk_form_b() and
      changed internals to use DW_DLV_OK/DW_DLV_ERROR.
      Many places where errors were ignored now have checks for error.
    * pro_section.h: Added GET_CHUNK_ERR to return DW_DLV_ERROR
      on error. Altered internal function _dwarf_transform_arange_to_disk()
      and _dwarf_transform_simplename_to_disk()
      to the newer interface.
    * pro_types.h: Internal declaration of _dwarf_transform_simplename_to_disk()
      now uses the new interface.
2016-09-11 David Anderson
    * dwarf_dsc.c: Set the internal flag so we do not redo the
      leb decoding over and over.
2016-09-08 David Anderson
    * Makefile.in: Add dwarf_dsc.c to the build to access
      DW_AT_discr_list attributes.
    * dwarf.h: Added comment that DW_AT_discr_list is DWARF2.
    * dwarf_alloc.c, dwarf_alloc.h: Added DW_DLA_DSC_HEAD support.
    * dwarf_dsc.c: Implement the new discriminant list
      functions.
    * dwarf_dsc.h: Internal discriminant types.
    * libdwarf.h.in: A new opaque type and new functions
      dwarf_discr_list etc.
    * dwarf_errmsg_list.c: New error code for
      discriminants: DW_DLE_DISCR_ARRAY_ERROR.
    * checkexample.c: Added a new example. for dwarf_descr_list().
2016-09-01 David Anderson
    * libdwarf2.1.mm: Improved the wording for dwarf_diename()
      and dwarf_die_text().
    * libdwarf2.1.pdf: Regenerated as Version 2.51.
2016-08-28 David Anderson
    * libdwarf.h.in: Added dwarf_pro_get_string_stats() for producer
      library users to know how libdwarf handled DW_AT_name etc.
    * pro_die.c: Corrected the tsearch-related compare/hash functions
      to work correctly.
    * pro_finish.c: Implements dwarf_pro_get_string_stats().
    * pro_init.c: Hash function for tsearch implemented correctly now.
    * pro_opaque.h: Changed the hash data structure so it can work
      correctly. Added the statistics struct to the Dwarf_P_Debug
      structure.
    * libdwarf2p.1.mm: Documents dwarf_pro_get_string_stats().
    * libdwarf2p.1.pdf: Revision 1.41. Regenerated.
2016-08-27 David Anderson
    * pro_section.c, pro_reloc_stream.c: In a couple of places names were
      shadowing other names. Fixed. No change in functionality.
2016-08-25 David Anderson
    * libdwarf.h.in: Added new error code relating to DW_FORM_strp
      relocations.
    * dwarf_errmsg_list.c: Added DW_DLE_DEBUGSTR_UNEXPECTED_REL string.
    * pro_die.c: Added a comment related to DW_FORM_strp.
    * pro_opaque.h: Added/modified commentary.
    * pro_section.c: Now sets the correct section symbol for
      relocations for strings in .debug_str.
    * pro_reloc.c: Added commentary, deleted blank lines.
    * pro_reloc_stream.c: Moved declarations to inner
      contexts where possible. Refined looping for clarity.
2016-08-23 David Anderson
    * libdwarf2p.1.mm: Document dwarf_pro_set_default_string_form.
    * libdwarf2p.1.pdf: Regenerated. Rev 1.40.
2016-08-23 David Anderson
    * dwarf_alloc.c,dwarf_frame.c: Remove trailing whitespace.
    * dwarf_errmsg_list.c:  Has four new error codes to deal
      with emitting .debug_str from the producer.
    * gennames.c: Added 'static' to a static function to
      avoid compiler warnings.
    * libdwarf.h.in: Four new error codes.
      A new producer function: dwarf_pro_set_default_string_form() which
      causes debug_info strings to be emitted in .debug_str where
      that seems like it might save space.
    * pro_alloc.c: A new debug_str producer string 
      hashtab free helper function to clean up the .debug_str
      hash table..
    * pro_die.c: Now calls a single function to emit strings and
      can emit in either .debug_info or .debug_str.
    * pro_die.h: Declares _dwarf_pro_set_string_attr() now.
    * pro_forms.c: Some local variables are always initialized now
      at declaration point. Now uses common code to set up strings.
    * pro_init.c: Initializes debug_str hash table for strings
      And sets up the section properly. Defines the hashfunc.
    * pro_opaque.h: Fixes some spacing awkwardness. Adds
      .debug_str hash data and eliminates unused data.
    * pro_section.c: Now emits .debug_str when such is
      wanted.
2016-06-13 David Anderson
    * dwarf_alloc.c: Dwarf_Fde_s now has a destructor.
    * dwarf_frame.c,dwarf_frame.h: Now dwarf_get_fde_info_for_reg3 memoizes
      frame data making one pattern of use (from dwarfdump)
      much much faster.
2016-06-13 David Anderson
    * dwarf_frame.c: Revised some local assignments so
      we are sure the same value used as intended.
      Added some {} on if for consistency with libdwarf use.
    * gennames.c: Update version string.
2016-06-12 David Anderson
    * libdwarf/gennames.c: Update version string.
2016-06-12 David Anderson
    * dwarf_frame.c: Adding dwarf_get_fde_info_for_cfa_reg3_b()
      which lets dwarfdump print frame data a bit more quickly.
      It is unclear whether other applications will find this
      new interface to be of value.
    * dwarf_frame.h,dwarf_frame3.c: Internal interfaces changed slightly
      to allow the new function to work.
    * libdwarf.h.in: Added dwarf_get_fde_info_for_cfa_reg3_b()
      declaration.
    * libdwarf2.1.mm: Documents  dwarf_get_fde_info_for_cfa_reg3_b().  
      Rev.2.50
    * libdwarf2.1.pdf: Regenerated.
2016-06-08 David Anderson
    * dwarf_init_finish.c, dwarf_line_table_reader_common.c: Remove
      trailing whitespace. Fix one indent.
2016-06-08 David Anderson
    * gennames.c: Update version string.
2016-06-07 David Anderson
    * Makefile.in: Use $(SONAME) rather than libdwarf.so.1 whereever
      possible.
2016-06-01 David Anderson
    * Makefile.in: Tweaks for debian build compatibility.
    * gennames.c: Use DW_VERSION_DATE_STR instead of __DATE__ __TIME__
2016-05-23 David Anderson
    * dwarf_errmsg_list.c, libdwarf.h.in: Added 
      DW_DLE_COMPRESSED_EMPTY_SECTION.
    * dwarf_init_finish.c: If load_section gets
      DW_DLV_NO_ENTRY just return that.
      If requres-decompress but has no data call it
      a corrupt Elf section (given what sections
      libdwarf is interested in).
    * dwarf_line_table_reader_common.c: Only
      deal with line table format entries if the
      count is > 0.
2016-05-23 David Anderson
    * Makefile.in: add SONAME libdwarf.so.1 to dynamic section when
      building shared libdwarf.so
      We have not made an incompatible interface change since
      May 19, 2014 (and that was to the producer code not to
      what DWARF readers use).
2016-05-22 David Anderson
    * libdwarf.h.in, dwarf_errmsg_list.c: Adding
      DW_DLE_DIRECTORY_FORMAT_COUNT_VS_DIRECTORIES_MISMATCH error code.
      Fixed unsigned/signed comparison warning in the table test code.
    * dwarf_line.c: If we find a null pointer from include directores
      we substitute "<erroneous NULL include dir pointer>" for the
      reader.
    * dwarf_line_table_reader_common.c: Detect a corrupted DWARF5
      directory count vs directory format count problem and return
      an error.
2016-05-20 David Anderson
    * dwarf_macro5.c: Was failing to initialize 
      mc_cu_context leading to coredump.
      If dwarf_srcfiles() returned zero as the count
      of source files an erroneous calloc() would result in  an
      objection from valgrind: an erroneous calloc of zero bytes
      of srcfiles pointers would never be freed.
2016-05-19 David Anderson
    * Makefile.in: HOST_CFLAGS now references CFLAGS
      at the request of the Debian project.
    * configure.in: Now defaults to  -fPIC always
      (though in a nonshared build one could reasonably 
      turn it off with --disable-fpic)
      Adds several messages reporting configure actions.
    * configure: Regenerated.
2016-05-18 David Anderson
    * dwarf_form.c: Directly check expression length against
      section length in case expression length very very large.
    * dwarf_query.c: _dwarf_calculate_info_section_*() routines
      made clearer and the *_start_ptr() instance also now returns
      the length (via a pointer arg).
    * dwarf_xu_index.c: Check data read from the section so 
      a wildly large columns count or slots count will be caught
      and an error returned.
2016-05-16 David Anderson
    * dwarf_elf_access.c: Check more thoroughly for corrupt
      relocation records and return an error if such found.
    * dwarf_macro5.c: Remove trailing whitespace.
2016-05-10 David Anderson
    * dwarf_arange.c,dwarf_die_deliv.c: All read operations check for overrun.
    * dwarf_errmsg_list.c: DW_DLE_HEADER_LEN_BIGGER_THAN_SECSIZE,
      DW_DLE_LOCEXPR_OFF_SECTION_END, and DW_DLE_POINTER_SECTION_UNKNOWN
      added to error values.
    * dwarf_form.c,dwarf_frame.c,dwarf_frame2.c,dwarf_global.c,dwarf_line.c,
      dwarf_line_table_reader_common.c,dwarf_loc.c,dwarf_loc2.c,
      dwarf_macro5.c,dwarf_print_lines.c,dwarf_query.c,
      dwarf_ranges.c,dwarf_util.c, dwarf_xu_index.c: All read 
      operations check for overrun.
    * dwarf_opaque.h: Put the 4 SGI-only section data
      items next to each other to make it clear they
      are such.
    * dwarf_util.h: Added some checks to READ_AREA_LENGTH_CK
    * libdwarf.h.in: Defined the new error names.
2016-05-07-b David Anderson
    * libdwarf2.1.mm,libdwarf2p.1.mm: Fixed spelling errors.
    * libdwarf2.1.pdf,libdwarf2p.1.pdf: Regenerated.
2016-05-07 David Anderson
    * libdwarf.h.in, dwarf_errmsg_list.c: New error codes for
      stopping due to corrupted frame data.
    * dwarf_frame.c,dwarf_frame.h,dwarf_frame2.c,dwarf_line.c:
      Notice frame area overrun and generate error.
2016-05-06 David Anderson
    * dwarf_errmsg_list.c: Added DW_DLE_ZLIB_SECTION_SHORT.
    * dwarf_form.c: Now checking for section overrun.
    * dwarf_init_finish.c: Now checking zlib reading
      for section overrun.
    * dwarf_macro5.c: Now checking for section overrun and
      also fixing double delete caused by having
      _dwarf_get_alloc() space pointing at other _dwarf_get_alloc()
      space. Because in case of error the order of free 
      of such is unpredictable!
    * dwarf_macro5.h: Added comment on mc_srcfiles member.
    * libdwarf.h.in: Added DW_DLE_ZLIB_SECTION_SHORT.
2016-05-05 David Anderson
    * dwarf_form.c: Add a test so that a really large form_block length
      will not  be considered safe (due to unsigned arithmetic
      overflow).
      Fixed the new check-code reading  string offsets section
      so the endpoint in the check is that section, not debug_info.
    * dwarf_query.c: New function _dwarf_calculate_info_section_start_ptr()
      helps in some checking.
    * dwarf_util.h: Add a test so arithmetic overflow will not show
      a bogus value as being ok.
    * libdwarf.h.in,dwarf_errmsg_list.c: Add error code 
      DW_DLE_FORM_BLOCK_LENGTH_ERROR so we have a specific
      error for this case.
    * dwarf_line.c: %lld switched to  "%" DW_PR_DSd
    * dwarf_opaque.h: Added function declaration for 
      _dwarf_calculate_info_section_start_ptr().
2016-05-04 David Anderson
    * dwarf_macro5.c(construct_at_path_from_parts): Move 3 lines 
      of code up to test for NULL pointer. So we do not 
      dereference the pointer.
2016-05-03 David Anderson
    * dwarf_die_deliv.c: Add checks for overrun of end of section
      due to corrupted DWARF.
    * dwarf_arange.c,dwarf_util.c: first use of READ_UNALIGNED_CK.
    * dwarf_errmsg_list.c, libdwarf.h.in: DW_DLE_READ_LITTLEENDIAN_ERROR
      and DW_DLE_READ_BIGENDIAN_ERROR are errors possible
      in READ_UNALIGNED_CK. DW_DLE_LINE_OFFSET_WRONG_FORM gives
      a more meaningful description of a particular corruption
      problem (not a new test, just a new error name).
    * dwarf_elf_access.c: Add a check on relocations to ensure
      we do not write off the end of the section.
    * dwarf_query.c: Using local variables for shorter lines.
    * dwarf_util.h: Implement READ_UNALIGNED_CK macros.
    * dwarf_leb.c: Improve a couple comments.
    * dwarf_line.c: Now use DW_DLE_LINE_OFFSET_WRONG_FORM.
      Add operandmismatch() to get better debug information
      in case of corrupted dwarf. Revise the code for
      clarity.
    * dwarf_macro5.c: Duplicate free() could result if
      dwarf_finish() was used to clean up from a dwarf macro
      context.  Two functions are really static so
      the function type set properly now.
2016-04-30 David Anderson
    * dwarf_frame.c, dwarf_line_table_reader_common.c,
      dwarf_loc2.c: switch to using DECODE_LEB*_CK.
    * dwarf_frame.c: Delete unused local variables.
         Use DECODE_LEB*_CK for better error checking.
    * dwarf_frame2.c, dwarf_frame.h: Internal functions get new
      arguments to support DECODE_LEB*_CK. 
    * dwarf_arange.c: Using UNUSEDARG to suppress warning.
    * dwarf_line_table_reader_common.c: Use DECODE_LEB*_CK 
      for better error checking.
    * dwarf_loc2.c: Use DECODE_LEB*_CK 
      for better error checking.
2016-04-30 David Anderson
    * dwarf_die_deliv.c: Deleted unused local variable.
    * dwarf_form.c,dwarf_macro.c, dwarf_macro5.c: Now uses 
      DCODE_LEB128*_CK nearly everywhere
      for better checking for corrupted data.
    * dwarf_opaque.h:New argument to _dwarf_get_addr_index_itself()
      for better data checks..
    * dwarf_query.c: Uses revised _dwarf_get_addr_index_itself()
      interface.
    * dwarf_util.c: Fixed formatting errors.
2016-04-29 David Anderson
    * dwarf_line_table_reader_common.c, dwarf_macro.c,
      dwarf_macro5.c, dwarf_util.c, dwarf_util.h:
      Now use DECODE_LEB128_*CK macros simplifying
      the code while catching errors/corruption in DWARF
      data.
2016-04-28 David Anderson
    * dwarf_die_deliv.c: Now _dwarf_next_die_info_ptr() has
      a section length argument.
    * dwarf_query.c, dwarf_util.c: Now uses the checked version
      of leb reading.
    * dwarf_util.h: Now _dwarf_get_size_of_val() has
      section_end_ptr argument for checking leb values
      do not overrun end of section.
2016-04-27 David Anderson
    * dwarf_frame2.c: Now notices a frame-length field
      which is too large to be meaningful and returns
      an error..
2016-04-27 David Anderson
    * Makefile.in: Now dwarf_error.o dependency on
      dwarf_errmsg_list.c is explicit.
    * dwarf_errmsg_list.c: New error strings.
    * libdwarf.h.in: New error values for when running off
      end of section and line range and address size where
      zero leads to trouble..
    * dwarf_abbrev.c,dwarf_die_deliv.c, dwarf_frame.c,
      dwarf_frame.h, dwarf_frame2.c,dwarf_frame3.c,dwarf_leb.c,
      dwarf_line.c, dwarf_line.h, dwarf_line_table_reader_common.c,
      dwarf_query.c,dwarf_util.c,dwarf_util.h: 
      Add checks for running off end of section.
2016-04-26 David Anderson
    * Makefile.in: The new errmsg_check dependency
      line was a bit wrong. libdwarf.h should not have $(srcdir)
2016-04-25 David Anderson
    * dwarf_errmsg_list.c: When -DTESTING ensure all the 
      error messages have a value in () so we can check 
      that value.
2016-04-25 David Anderson
    * dwarf_tied.c: A C11-ism crept in. Fixed.
      Added 'static' to local function declaration.
      Removed unused local variable.
    * dwarf_errmsg_list.c: Now checks that the number in ()
      matches the index (and still checks that the array size
      is the declared size) when compiled -DTESTING. 
2016-04-25 David Anderson
    * dwarf_errmsg_list.c: Fixed indent mistakes.
    * dwarf_leb.c: Fixed places were leb128_length
      was assumed non-null (dwarf_form.c passes NULL!).
2016-04-25 David Anderson
    * Makefile.in: Added testing of the _dwarf_errmsgs array.
    * dwarf_error.c: Moved _dwarf_errmsgs out of dwarf_error.c into
      dwarf_errmsg_list.c
    * dwarf_errmsg_list.c: Now has error strings and test code.
2016-04-25 David Anderson
    * dwarf_error.c: The error description
      "DW_DLE_GDB_INDEX_INDEX_ERROR(264)" was missing the
      comma so following errors were reporting the wrong string.
2016-04-21  Carlos Alberto Enciso
     * Use the _WIN32 macro to identify a WINDOWS specific code.
2016-03-14 David Anderson
    * dwarf_util.c: Changed 'byte' to 'byte pair'
      in a comment.  Where we read abbreviation AT/FORM lists.
2016-03-14 David Anderson
    * dwarf_error.c(_dwarf_errno): Now prints to stdout and
      does abort(1) when it has to give up. Instead of
      using stderr and abort().
      It is not a good idea for applications to fail to provide
      error handling, so no one should notice this change.
    * libdwarf2.1.mm: Documents behavior in case there is no error
      handling provided by our caller.
    * libdwarf2.1.pdf: Regenerated. Rev 2.48.
2016-03-14 David Anderson
    * libdwarf2.1.mm: Documents Dwarf_Handler error handler function.
    * libdwarf2.1.pdf: Regenerated. Rev 2.47.
2016-03-13 David Anderson
    * dwarf_query.c: Use dwarf_formstring to read string
      attributes as it handles all the string types already.
      Now dwarf_diename() and dwarf_die_text() call dwarf_formstring()
      so DW_FORM_strp_sup and DW_FORM_GNU_strp_alt are
      properly handled(along with all the other string FORMs).
    * dwarf_form.c: Handle an error in dwarf_formstring()
      (for tied files, or the lack thereof)
      differently so it all works properly even if the incoming
      error argument is null.
2016-03-12 David Anderson
    * dwarf_abbrev.c: Uses renamed fields abbrev internal struct.
      Removes some gratuitous (). Adds clarifying {}
    * dwarf_abbrev.h: renames Dwarf_Abbrev_s struct fields
      from ab_tag to dab_tag, etc.
      Adds global section offset to the fields.
    * dwarf_die_deliv.c: Uses renamed Abbrev_List fields.
      Adds dwarf_die_abbrev_global_offset() function so 
      clients can properly identify where an abbrev entry is
      in .debug_abbrev.
    * dwarf_die_deliv.h: renames Dwarf_Abbrev_List 
      struct fields from ab_tag to abl_tag etc.
      Adds abl_goffset, abl_count.
    * dwarf_query.c,dwarf_util.c: Uses renamed Dwarf_Abbrev_List 
      fields.
    * libdwarf.h.in: Adds function dwarf_die_abbrev_global_offset().
    * libdwarf2.1.mm: Documents dwarf_die_abbrev_global_offset().
    * libdwarf2.1.pdf: Regenerated. Rev 2.46.
2016-03-11 David Anderson
    * dwarf_die_deliv.c: Fixed issues with handling NULL
      Dwarf_Error*  and with mistakes treating DW_DLV_NO_ENTRY
      as if it were DW_DLV_ERROR.
    * dwarf_form.c: Only do dwarf_errno(*error) when error is non-null.
    * dwarf_macro5.c, dwarf_query.c, dwarf_ranges.c: Avoid the 
      possibility of 
      doing dwarf_errno(*error) when error is null.
    * dwarf_util.c(_dwarf_error_mv_s_to_t): Added code to 
      ensure that nothing crash-worthy happens
      even if a future internal caller calls it with one or more NULL
      arguments.
    * libdwarf2.1.mm: Added a few words about Error Handling in general
      to clarify earlier wording (earlier wording  was not as explicit
      as it should have been).
    * libdwarf2.1.pdf: Regenerated. Version 2.45
    * dwarf_sort_line.c: Though no longer built or used, added
      an initializer to a local variable for correctness.
    * dwarf_addr_finder.c: Though no longer compiled or used (is IRIX only),
      cleaned up local variable declarations that were not
      up to the current standard usage in libdwarf.
2016-03-11 David Anderson
    * Makefile.in: Added a comment about pr and pdf-building.
2016-03-09 David Anderson
    * libdwarf2.1.mm: Slightly altered the dwarf_offsets_list() documentation.
    * libdwarf2.1.pdf: Rev 2.44. Regenerated.
2016-03-09 David Anderson
    * dwarf_form.c: Correct and amplify a comment.
2016-03-01 David Anderson
    * libdwarf2.1.mm: Documented dwarf_dietype() and
      dwarf_offset_list().
    * libdwarf2.1.pdf: Regenerated. Rev 2.43
    * checkexamples.c: Added example for dwarf_offset_list().
2016-02-19 Carlos Alberto Enciso 
   * dwarf_alloc.h, dwarf_alloc.c, dwarf_base_types.h, dwarf_opaque.h:
      New allocator type (DW_DLA_CHAIN_2), to allow a list of addressed
      types (address, offset).
      There was  Memory corruption due to incorrect usage of 
      memory allocator type.
    * dwarf_query.c: Use the new allocator type.
2016-02-14  David Anderson
    * libdwarf2.1.mm: dwarf_exprloc -> dwarf_formexprloc.
      The spelling error was introduced in version 2.41.
    * libdwarf2.1.pdf: Regenerated. Version 2.42
2016-02-13  David Anderson
    * libdwarf2.1.mm: Added dwarf_lineoff_b() documentation.
      Fixed a typo in dwarf_formexprloc() documentation.
    * libdwarf2.1.pdf: Regenerated. Version 2.41
    * Makefile.in: Add HOSTCFLAGS HOSTLDFLAGS HOSTCC to make
      it easier to cross-compile.  Remove common.c, common.h
      (a few lines of code moved to gennames.c).
    * README: document use of HOSTCC
    * common.c,common.h: Delete. A few lines of code moved to gennames.c.
    * configure.in: for AC_TRY_RUN add [],[] for else and for
      cross-compile cases.
    * configure: Regenerated.
    * dwarf_die_deliv.c, dwarf_frame2.c, dwarf_line.c, 
      dwarf_macro5.c, dwarf_print_lines.c, dwarf_ranges.c:
      Renamed to avoid shadowing variables with same name. 
      For clarity.
    * gennames.c: Incorporates a few lines from common.c
      so common.c, common.h can be deleted.
2016-02-10  David Anderson
    * README: Improved a comment about Dwarf_Obj_Access_Methods.
    * dwarf_elf_access.c: New function _dwarf_get_elf_flags_func()
      extracts the sh_flags field from Elf sections. In an odd way
      so we preserve binary and source compatibility.+
    * dwarf_error.c,libdwarf.h.in: New error DW_DLE_ELF_FLAGS_NOT_AVAILABLE.
    * dwarf_init_finish.c: Use new (global) function pointer
      _dwarf_get_elf_flags_func_ptr
      to access extra Elf data without breaking compatibility.
      Add additional way (SHF_COMPRESSED) to detect zlib
      compression and expand the compressed data.
2016-02-08  David Anderson
    * dwarf_alloc.c: Drop VALTYPE, use DW_TSHASHTYPE instead.
      Use DW_TSHASHTYPE in the hash functions.
    * dwarf_tied.c: Use DW_TSHASHTYPE in the hash function.
    * dwarf_tsearchhash.c: Add back the UNUSEDARG to avoid
      unused argument warnings.
2016-02-07  David Anderson
    * dwarf_init_finish.c: Fix indents. remove a trailing space.
    * dwarf_tsearch.h,dwarf_tsearchhash.c: Now DW_TSHASHTYPE (if not defined
      otherwise) defines the type returned by the hash function
      used in tsearchhash.
    * pro_alloc.c: Removed trailing whitespace.
2016-02-07  David Anderson
    * README: Mention 
      https://github.com/jrfonseca/drmingw/tree/master/src/mgwhelp
    * dwarf_init_finish.c: If SHT_RELA not defined define it as 4
      in hopes that will not cause trouble for mingw.  For Elf
      objects 4 is the correct value and is defined in elf.h
2016-02-06  David Anderson
    * dwarf_elf_access.c,dwarf_original_elf_init.c,dwarf_tsearchhash.c,
      libdwarfdefs.h: Remove trailing whitespace.
2016-02-06  David Anderson
    * configure.in: defines HAVE_UNUSED_ATTRIBUTE 
      if the gcc '__attribute__ ((unused))' compiles ok.
    * config.h.in, configure: Regenerated.
    * libdwarfdefs.h: Test HAVE_UNUSED_ATTRIBUTE and define
      UNUSEDARG appropriately.
    * dwarf_alloc.c,dwarf_elf_access.c,dwarf_form.c,dwarf_frame2.c,
      dwarf_gdbindex.c,dwarf_global.c,dwarf_init_finish.c,dwarf_line.c,
      dwarf_line_table_reader_common.c,dwarf_macro5.c,
      dwarf_original_elf_init.c,dwarf_print_lines.c,dwarf_ranges.c,
      dwarf_tsearchhash.c,dwarf_util.c,dwarf_xu_index.c,
      pro_alloc.c,pro_frame.c,pro_init.c,pro_reloc.c,
      pro_reloc_stream.c,pro_section.c: Use UNUSEDARG to suppress
      meaningless unused-parameter warnings from gcc.
2016-02-06  David Anderson
     * dwarf_tsearchhash.c: The original default
       hash table size (a prime number) was very small. Now its
       closer to 100.
2016-02-06  David Anderson
     * dwarf_frame.h: Added fde_fd_eh_table_value. 
       Added fde->fd_gnu_eh_aug_present so presence/absence
       is unambiguous.
     * dwarf_frame.c: Added code to set fd_eh_table_value when
       appropriate, though there is no interface for dwarfdump to
       get the value yet.
     * dwarf_frame2.c: Update the new fields appropriately.
       Corrected some comments about the eh_frame cie_id field.
2016-02-05  David Anderson
     * dwarf_frame2.c: Comments in get_cieptr_given_offset()
       were slightly incorrect and one calculation was pointlessly
       full of casts.  Fixed commentary about the CIE_pointer
       (CIE id or FDE id) field in a frame header.
     * dwarf_loc2.c: Fixed compiler warning on signed/unsigned
       comparison by changing local variable int->Dwarf_Unsigned..  
     * pro_init.c:  Removed extraneous semicolon to avoid
       warning for C90.
2016-01-26  David Anderson
     * dwarf_abbrev.c: Remove useless blank line.
     * dwarf_macro5.c: Add check for macro_import offset correctness.
2016-01-21  David Anderson
     * libdwarf.h.in: Typo, */* fixed to be * /*
     * configure.in: Added new gcc compiler options to --enable-wall.
     * configure: regenerated.
     * dwarf_die_deliv.c dwarf_frame.c,dwarf_frame2.c,dwarf_gdbindex.c,
       dwarf_gdbindex.h,dwarf_line.c,dwarf_line.h,
       dwarf_line_table_reader_common.c,dwarf_macro5.c,dwarf_query.c,
       dwarf_tsearchhash.c: Eliminated use of int/Dwarf_Signed 
       in favor of unsigned types where
       signed served no purpose. Added ommitted return DW_DLV_NO_ERROR
       in dwarf_frame2.c.  Other than 'unused parameter' fixed
       the warnings from gcc.
       No interfaces changed though. To keep binary compatibility.
2016-01-20  David Anderson
     * dwarf_query.c: New function dwarf_die_text() is a general way
       to get strings from various attributes in a DIE.
     * libdwarf.h.in: Add prototype for dwarf_die_text().
     * libdwarf2.1.mm: Document dwarf_die_text().
     * libdwarf2.1.pdf: Regenerated. Version 2.40.

2016-01-19  David Anderson
     * Makefile.in: Remove dwarf_stubs.o.
     * configure.in: Add various gcc opts to --enable-wall
       to get appropriate coverage.
     * configure: regenerated.
     * dwarf_macro5.c: File-local functions now declared static.
     * dwarf_query.c: File-local functions now declared static.
     * dwarf_stubs.c: No longer this function. It never had a prototype
       declaration and never had more than return DW_DLV_ERROR as
       an implementation.
     * dwarf_util.c: Remove trailing whitespace.
     * dwarf_original_elf_init.c(dwarf_set_tied_dbg): Added 
       check for null dbg.
     * dwgetopt.c: Add include of dwgetopt.h. #if 0 a testing-only function.
       All functions prototyped, no ().
     * libdwarf.h.in: Comment out argument names for safety.
       Added dwarf_get_tied_dbg(), dwarf_dietype_offset(),
       dwarf_pubtype_type_die_offset() declarations.
       Sorted the dwarf_get_TAG_name() etc function names.
     * pro_alloc.c: Documented and commented a useless function,
       dwarf_p_dealloc(). .
     * pro_alloc.h: Prototyped both the useful and useless
       global-to-libdwarf producer 
       functions _dwarf_p_dealloc and dwarf_p_dealloc.
     * libdwarf2.1.mm: Documented dwarf_get_tied_dbg(),
       dwarf_fde_section_offset(), and dwarf_cie_section_offset() 
     * libdwarf2.1.pdf: Regenerated. Rev 2.39
2016-01-19  David Anderson
     * dwarf_form.c,dwarf_macro5.c: Ensure declarations 
       before executable statements
     * dwarf_loc.c: Cast pointer to Dwarf_Small* so pointer arithmetic
       works (standard conformance).
       Ensure declarations before executable statements
     * dwarf_macro5.c: Ensure declarations before executable statements.
     * dwarf_query.c: Ensure declarations before executable statements.
       Add dwarf_dietype_offset() convenience function.
     * dwarf_util.c: Use a local name that does not conflict
       with standards. use mydw_errno, not errno.
     * dwarf_frame2.c(dwarf_read_cie_fde_prefix):  Add tests 
       to ensure we do not access past end of a section.
2016-01-19  David Anderson
     * dwarf_form.c, dwarf_frame2.c,: Fix indentation and trailing whitespace.
2016-01-19  David Anderson
     * dwarf_line.c, dwarf_line_table_reader_common.c,
       dwarf_loc.c, dwarf_macro5.c, dwarf_query.c, pro_die.c:
       Remove silly second ; from ;; where appropriate.
2016-01-19  David Anderson
     * libdwarf.h.in, dwarf_error.c: New error numbers. 
       DW_DLE_LINE_STRP_OFFSET_BAD, DW_DLE_STRING_FORM_IMPROPER.
     * dwarf_form.c: Added suport for DW_FORM_line_strp into 
       dwarf_form_string().
2016-01-17  David Anderson
     * dwarf_frame2.c: Added additional checks for
       bad frame section. Looking for premature end of frame data.
2016-01-16  David Anderson
     * libdwarf2.1.mm: Documented DWARF5 macro operations.
       Version 2.38
     * libdwarf2.1.pdf: Regenerated.
     * libdwarf2p.1.pdf: Regenerated following a trivial
       clarification on cie production made a couple days ago.
2016-01-15  David Anderson
     * pro_frame.h, pro_frame.c: The code adding a CIE for output
       (dwarf_add_frame_cie())
       was simply assuming that the augmentation string passed in was
       in stable storage.  Now it uses strdup() to guarantee there
       no surprises.
2016-01-14  David Anderson
     * dwarf_query.c(dwarf_die_offsets): 'res ==' corrected to 'res ='.
2016-01-12  David Anderson
     * dwarf_macro5.c: Fixed DW_MACRO_define/undef
       calls of  _dwarf_check_string_valid().
       Arranged to get the macro unit offset out
       when creating context.
     * libdwarf.h.in: Fixed declaration of dwarf_get_macro_context()
       to get the macro unit offset out of it
       so it can work properly in all contexts.