[PATCH] Initial DWARF64 support for .debug_line

[Eric Christopher]

Is this actually using 64-bit dwarf or is it dwarf with 64-bit
pointers? If it's the former ... then how big is the testcase? It
really shouldn't be creating dwarf64 unless the references in the
object are large (not the size of a pointer) unless this is dwarf2.

-eric

On Mon, Oct 21, 2013 at 11:55 AM, Ed Maste <emaste at freebsd.org> wrote:
>
>   I compiled the existing dwarfdump-inl-test.cc for FreeBSD mips64:
>
>   % g++ --version
>   g++ (GCC) 4.2.1 20070831 patched [FreeBSD]
>   Copyright (C) 2007 Free Software Foundation, Inc.
>   This is free software; see the source for copying conditions.  There is NO
>   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
>   % g++ -g dwarfdump-inl-test.cc -o dwarfdump-inl-test.freebsd-elf-mips64
>
>   current state:
>   ```
>   % bin/llvm-dwarfdump --debug-dump=line dwarfdump-inl-test.freebsd-elf-mips64
>   dwarfdump-inl-test.freebsd-elf-mips64:  file format ELF64-unknown
>
>
>   .debug_line contents:
>   %
>   ```
>   with this patch:
>   ```
>   % bin/llvm-dwarfdump --debug-dump=line dwarfdump-inl-test.freebsd-elf-mips64
>   dwarfdump-inl-test.freebsd-elf-mips64:  file format ELF64-unknown
>
>
>   .debug_line contents:
>   Line table prologue:
>      total_length: 0x00000212
>           version: 2
>   prologue_length: 0x000001ab
>   min_inst_length: 1
>   default_is_stmt: 1
>         line_base: -5
>        line_range: 14
>       opcode_base: 13
>   ...
>   ```
>
>   this only outputs the first CompileUnit though, perhaps because the parsing fails in another section in DWARFContext::parseCompileUnits().  Is it reasonable to add this dwarfdump-inl-test.freebsd-elf-mips64 binary and a basic test, fleshing it out when DWARF64 parsing for other sections is added?
>
>   (the test file is 15638 bytes -- larger than the clang-compiled version, due to the lack of -gline-tables-only)
>
> http://llvm-reviews.chandlerc.com/D1988
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