espressif/binutils-gdb
1
0
Fork 0
mirror of https://github.com/espressif/binutils-gdb.git synced 2025-06-25 04:49:54 +08:00
Code Issues Packages Projects Releases Wiki Activity
113,543 Commits 28 Branches 69 Tags
5aca7eaa2be78b5bb9f993b901b32acef51e5c45
Commit Graph

17 Commits

Author SHA1 Message Date
Joel Brobecker
213516ef31 Update copyright year range in header of all files managed by GDB 
This commit is the result of running the gdb/copyright.py script,
which automated the update of the copyright year range for all
source files managed by the GDB project to be updated to include
year 2023.
 2023-01-01 17:01:16 +04:00
Philippe Waroquiers
14ae285f34 Fix jump on uninit producer_is_clang bit of cu.h dwarf2_cu struct. 
Valgrind reports a "jump on unitialised bit error" when running
    e.g. gdb.base/macro-source-path.exp (see details below).

    Fix this by initializing producer_is_clang member variable of dwarf2_cu.

    Tested on amd64/debian11 and re-running gdb.base/macro-source-path.exp
    under valgrind.

    ==2140965== Conditional jump or move depends on uninitialised value(s)
    ==2140965==    at 0x5211F7: dwarf_decode_macro_bytes(dwarf2_per_objfile*, buildsym_compunit*, bfd*, unsigned char const*, unsigned char const*, macro_source_file*, line_header const*, dwarf2_section_info const*, int, int, unsigned int, dwarf2_section_info*, dwarf2_section_info*, gdb::optional<unsigned long>, htab*, dwarf2_cu*) (macro.c:676)
    ==2140965==    by 0x52158A: dwarf_decode_macros(dwarf2_per_objfile*, buildsym_compunit*, dwarf2_section_info const*, line_header const*, unsigned int, unsigned int, dwarf2_section_info*, dwarf2_section_info*, gdb::optional<unsigned long>, int, dwarf2_cu*) (macro.c:967)
    ==2140965==    by 0x523BC4: dwarf_decode_macros(dwarf2_cu*, unsigned int, int) (read.c:23379)
    ==2140965==    by 0x552AB5: read_file_scope(die_info*, dwarf2_cu*) (read.c:9687)
    ==2140965==    by 0x54F7B2: process_die(die_info*, dwarf2_cu*) (read.c:8660)
    ==2140965==    by 0x5569C7: process_full_comp_unit (read.c:8429)
    ==2140965==    by 0x5569C7: process_queue (read.c:7675)
    ==2140965==    by 0x5569C7: dw2_do_instantiate_symtab (read.c:2063)
    ==2140965==    by 0x5569C7: dw2_instantiate_symtab(dwarf2_per_cu_data*, dwarf2_per_objfile*, bool) (read.c:2085)
    ==2140965==    by 0x55700B: dw2_expand_symtabs_matching_one(dwarf2_per_cu_data*, dwarf2_per_objfile*, gdb::function_view<bool (char const*, bool)>, gdb::function_view<bool (compunit_symtab*)>) (read.c:3984)
    ==2140965==    by 0x557EA3: cooked_index_functions::expand_symtabs_matching(objfile*, gdb::function_view<bool (char const*, bool)>, lookup_name_info const*, gdb::function_view<bool (char const*)>, gdb::function_view<bool (compunit_symtab*)>, enum_flags<block_search_flag_values>, domain_enum, search_domain) (read.c:18781)
    ==2140965==    by 0x778977: objfile::lookup_symbol(block_enum, char const*, domain_enum) (symfile-debug.c:276)
    ....
    ==2140965==  Uninitialised value was created by a heap allocation
    ==2140965==    at 0x4839F01: operator new(unsigned long) (vg_replace_malloc.c:434)
    ==2140965==    by 0x533A64: cutu_reader::cutu_reader(dwarf2_per_cu_data*, dwarf2_per_objfile*, abbrev_table*, dwarf2_cu*, bool, abbrev_cache*) (read.c:6264)
    ==2140965==    by 0x5340C2: load_full_comp_unit(dwarf2_per_cu_data*, dwarf2_per_objfile*, dwarf2_cu*, bool, language) (read.c:7729)
    ==2140965==    by 0x548338: load_cu(dwarf2_per_cu_data*, dwarf2_per_objfile*, bool) (read.c:2021)
    ==2140965==    by 0x55634C: dw2_do_instantiate_symtab (read.c:2048)
    ==2140965==    by 0x55634C: dw2_instantiate_symtab(dwarf2_per_cu_data*, dwarf2_per_objfile*, bool) (read.c:2085)
    ==2140965==    by 0x55700B: dw2_expand_symtabs_matching_one(dwarf2_per_cu_data*, dwarf2_per_objfile*, gdb::function_view<bool (char const*, bool)>, gdb::function_view<bool (compunit_symtab*)>) (read.c:3984)
    ==2140965==    by 0x557EA3: cooked_index_functions::expand_symtabs_matching(objfile*, gdb::function_view<bool (char const*, bool)>, lookup_name_info const*, gdb::function_view<bool (char const*)>, gdb::function_view<bool (compunit_symtab*)>, enum_flags<block_search_flag_values>, domain_enum, search_domain) (read.c:18781)
    ==2140965==    by 0x778977: objfile::lookup_symbol(block_enum, char const*, domain_enum) (symfile-debug.c:276)
    ....
 2022-11-26 12:43:58 +01:00
Simon Marchi
df86565b31 gdb: remove TYPE_LENGTH 
Remove the macro, replace all uses with calls to type::length.

Change-Id: Ib9bdc954576860b21190886534c99103d6a47afb
 2022-09-21 11:05:21 -04:00
Simon Marchi
f71ad5556c gdb: add "id" fields to identify symtabs and subfiles 
Printing macros defined in the main source file doesn't work reliably
using various toolchains, especially when DWARF 5 is used.  For example,
using the binaries produced by either of these commands:

    $ gcc --version
    gcc (GCC) 11.2.0
    $ ld --version
    GNU ld (GNU Binutils) 2.38
    $ gcc test.c -g3 -gdwarf-5

    $ clang --version
    clang version 13.0.1
    $ clang test.c -gdwarf-5 -fdebug-macro

I get:

    $ ./gdb -nx -q --data-directory=data-directory a.out
    (gdb) start
    Temporary breakpoint 1 at 0x111d: file test.c, line 6.
    Starting program: /home/simark/build/binutils-gdb-one-target/gdb/a.out

    Temporary breakpoint 1, main () at test.c:6
    6         return ZERO;
    (gdb) p ZERO
    No symbol "ZERO" in current context.

When starting to investigate this (taking the gcc-compiled binary as an
example), we see that GDB fails to look up the appropriate macro scope
when evaluating the expression.  While stopped in
macro_lookup_inclusion:

    (top-gdb) p name
    $1 = 0x62100011a980 "test.c"
    (top-gdb) p source.filename
    $2 = 0x62100011a9a0 "/home/simark/build/binutils-gdb-one-target/gdb/test.c"

`source` is the macro_source_file that we would expect GDB to find.
`name` comes from the symtab::filename field of the symtab we are
stopped in.  GDB doesn't find the appropriate macro_source_file because
the name of the macro_source_file doesn't match exactly the name of the
symtab.

The name of the main symtab comes from the compilation unit's
DW_AT_name, passed to the buildsym_compunit's constructor:

  4815d6125e/gdb/dwarf2/read.c (L10627-10630)

The contents of DW_AT_name, in this case, is "test.c".  It is typically
(what I witnessed all compilers do) the same string that was passed to
the compiler on the command-line.

The name of the macro_source_file comes from the line number program
header's file table, from the call to the line_header::file_file_name
method:

  4815d6125e/gdb/dwarf2/macro.c (L54-65)

line_header::file_file_name prepends the directory path that the file
entry refers to, in the file table (if the file name is not already
absolute).  In this case, the file name is "test.c", appended to the
directory "/home/simark/build/binutils-gdb-one-target/gdb".

Because the symtab's name is not created the same way as the
macro_source_file's name is created, we get this mismatch.  GDB fails to
find the appropriate macro scope for the symtab, and we can't print
macros when stopped in that symtab.

To make this work, we must ensure that paths produced in these two ways
end up identical.  This can be tricky because of the different ways a
path can be passed to the compiler by the user.

Another thing to consider is that while the main symtab's name (or
subfile, before it becomes a symtab) is created using DW_AT_name, the
main symtab is also referred to using its entry in the line table
header's file table, when processing the line table.  We must therefore
ensure that the same name is produced in both cases, so that a call to
"start_subfile" for the main subfile will correctly find the
already-created subfile, created by buildsym_compunit's constructor.  If
we fail to do that, things still often work, because of a fallback: the
watch_main_source_file_lossage method.  This method determines that if
the main subfile has no symbols but there exists another subfile with
the same basename (e.g. "test.c") that does have symbols, it's probably
because there was some filename mismatch.  So it replaces the main
subfile with that other subfile.  I think that heuristic is useful as a
last effort to work around any bug or bad debug info, but I don't think
we should design things such as to rely on it.  It's a heuristic, it can
get things wrong.  So in my search for a fix, it is important that given
some good debug info, we don't end up relying on that for things to
work.

A first attempt at fixing this was to try to prepend the compilation
directory here or not prepend it there.  In practice, because of all the
possible combinations of debug info the compilers produce, it was not
possible to get something that would produce reliable, consistent paths.

Another attempt at fixing this was to make both macro_source_file
objects and symtab objects use the most complete form of path possible.
That means to prepend directories at least until we get an absolute
path.  In theory, we should end up with the same path in all cases.
This generally worked, but because it changed the symtab names, it
resulted in user-visible changes (for example, paths to source files in
Breakpoint hit messages becoming always absolute).  I didn't find this
very good, first because there is a "set filename-display" setting that
lets the user control how they want the paths to be displayed, and that
would suddenly make this setting completely ineffective (although even
today, it is a bit dependent on the debug info).  Second, it would
require a good amount of testsuite tweaks to make tests accept these
suddenly absolute paths.

This new patch is a slight variation of that: it adds a new field called
"filename_for_id" in struct symtab and struct subfile, next to the
existing filename field. The goal is to separate the internal ids used
for finding objects from the names used for presentation.  This field is
used for identifying subfiles, symtabs and macro_source_files
internally.  For DWARF symtabs, this new field is meant to contain the
"most complete possible" path, as discussed above.  So for a given file,
it must always be in the same form, everywhere.  The existing
symtab::filename field remains the one used for printing to the user, so
there shouldn't be any change in how paths are printed.

Changes in the core symtab files are:

 - Add "name_for_id" and "filename_for_id" fields to "struct subfile"
   and "struct symtab", next to existing "name" and "filename" fields.
 - Make buildsym_compunit::buildsym_compunit and
   buildsym_compunit::start_subfile accept a "name_for_id" parameter
   next to the existing "name" ones.
 - Make buildsym_compunit::start_subfile use "name_for_id" for looking
   up existing subfiles.  This is the key thing for making calls
   to start_subfile for the main source file look up the existing
   subfile successfully, and avoid relying on
   watch_main_source_file_lossage.
 - Make sal_macro_scope pass "filename_for_id", rather than "filename",
   to macro_lookup_inclusion.  This is the key thing to making the
   lookup work and macro printing work.

Changes in the DWARF files are:

 - Make line_header::file_file_name return the "most complete possible"
   name.  The only pre-existing user of this method is the macro code,
   to give the macro_source_file objects their name.  And we now want
   them to have this "most complete possible" name, which will match the
   corresponding symtab's "filename_for_id".
 - Make dwarf2_cu::start_compunit_symtab pass the "most complete
   possible" name for the main symtab's "filename_for_id".  In this
   context, where the info comes from the compilation unit's DW_AT_name
   / DW_AT_comp_dir, it means prepending DW_AT_comp_dir to DW_AT_name if
   DW_AT_name is not already absolute.
 - Change dwarf2_start_subfile to build a name_for_id for the subfile
   being started.  The simplest way is to re-use
   line_header::file_file_name, since the callers always have a
   file_entry handy.  This ensures that it will get the exact same path
   representation as the macro code does, for the same file (since it
   also uses line_header::file_file_name).
 - Update calls to allocate_symtab to pass the "name_for_id" from the
   subfile.

Tests exercising all this are added by the following patch.

Of all the cases I tried, the only one I found that ends up relying on
watch_main_source_file_lossage is the following one:

    $ clang --version
    clang version 13.0.1
    Target: x86_64-pc-linux-gnu
    Thread model: posix
    InstalledDir: /usr/bin
    $ clang  ./test.c -g3 -O0 -gdwarf-4
    $ ./gdb -nx --data-directory=data-directory -q -readnow -iex "set debug symtab-create 1"  a.out
    ...
    [symtab-create] start_subfile: name = test.c, name_for_id = /home/simark/build/binutils-gdb-one-target/gdb/test.c
    [symtab-create] start_subfile: name = ./test.c, name_for_id = /home/simark/build/binutils-gdb-one-target/gdb/./test.c
    [symtab-create] start_subfile: name = ./test.c, name_for_id = /home/simark/build/binutils-gdb-one-target/gdb/./test.c
    [symtab-create] start_subfile: found existing symtab with name_for_id /home/simark/build/binutils-gdb-one-target/gdb/./test.c (/home/simark/build/binutils-gdb-one-target/gdb/./test.c)
    [symtab-create] watch_main_source_file_lossage: using subfile ./test.c as the main subfile

As we can see, there are two forms used for "test.c", one with a "." and
one without.  This comes from the fact that the compilation unit DIE
contains:

    DW_AT_name ("test.c")
    DW_AT_comp_dir ("/home/simark/build/binutils-gdb-one-target/gdb")

without a ".", and the line table for that file contains:

    include_directories[  1] = "."
    file_names[  1]:
               name: "test.c"
          dir_index: 1

When assembling the filename from that entry, we get a ".".

It is a bit unexpected that the main filename resulting from the line
table header does not match exactly the name in the compilation unit.
For instance, gcc uses "./test.c" for the DW_AT_name, which gives
identical paths in the compilation unit and in the line table header.

Similarly, with DWARF 5:

    $ clang  ./test.c -g3 -O0 -gdwarf-5

clang create two entries that refer to the same file but are of in a different
form.

    include_directories[  0] = "/home/simark/build/binutils-gdb-one-target/gdb"
    include_directories[  1] = "."
    file_names[  0]:
               name: "test.c"
          dir_index: 0
    file_names[  1]:
               name: "test.c"
          dir_index: 1

The first file name produces a path without a "." while the second does.
This is not caught by watch_main_source_file_lossage, because of
dwarf_decode_lines that creates a symtab for each file entry in the line
table.  It therefore appears as "non-empty" to
watch_main_source_file_lossage.  This results in two symtabs:

    (gdb) maintenance info symtabs
    { objfile /home/simark/build/binutils-gdb-one-target/gdb/a.out ((struct objfile *) 0x613000005d00)
      { ((struct compunit_symtab *) 0x62100011aca0)
        debugformat DWARF 5
        producer clang version 13.0.1
        name test.c
        dirname /home/simark/build/binutils-gdb-one-target/gdb
        blockvector ((struct blockvector *) 0x621000129ec0)
        user ((struct compunit_symtab *) (null))
            { symtab test.c ((struct symtab *) 0x62100011ad20)
              fullname (null)
              linetable ((struct linetable *) 0x0)
            }
            { symtab ./test.c ((struct symtab *) 0x62100011ad60)
              fullname (null)
              linetable ((struct linetable *) 0x621000129ef0)
            }
      }
    }

I am not sure what is the consequence of this, but this is also what
happens before my patch, so I think its acceptable to leave it as-is.

To handle these two cases nicely, I think we will need a function that
removes the unnecessary "." from path names, something that can be done
later.

Finally, I made a change in find_file_and_directory is necessary to
avoid breaking test

    gdb.dwarf2/dw2-compdir-oldgcc.exp: info source gcc42

Without that change, we would get:

    (gdb) info source
    Current source file is /dir/d/dw2-compdir-oldgcc42.S
    Compilation directory is /dir/d

whereas the expected result is:

    (gdb) info source
    Current source file is dw2-compdir-oldgcc42.S
    Compilation directory is /dir/d

This test was added here:

  https://sourceware.org/pipermail/gdb-patches/2012-November/098144.html

Long story short, GCC <= 4.2 apparently had a bug where it would
generate a DW_AT_name with a full path ("/dir/d/dw2-compdir-oldgcc42.S")
and no DW_AT_comp_dir.  The line table has one entry with filename
"dw2-compdir-oldgcc42.S", which refers to directory 0.  Directory 0
normally refers to the compilation unit's comp dir, but it is
non-existent in this case.

This caused some symtab lookup problems, and to work around them, some
workaround was added, which today reads as:

    if (res.get_comp_dir () == nullptr
        && producer_is_gcc_lt_4_3 (cu)
        && res.get_name () != nullptr
        && IS_ABSOLUTE_PATH (res.get_name ()))
      res.set_comp_dir (ldirname (res.get_name ()));

Source: 6577f365eb/gdb/dwarf2/read.c (L9428-9432)

It extracts an artificial DW_AT_comp_dir from DW_AT_name, if there is no
DW_AT_comp_dir and DW_AT_name is absolute.

Prior to my patch, a subfile would get created with filename
"/dir/d/dw2-compdir-oldgcc42.S", from DW_AT_name, and another would get
created with filename "dw2-compdir-oldgcc42.S" from the line table's
file table.  Then watch_main_source_file_lossage would kick in and merge
them, keeping only the "dw2-compdir-oldgcc42.S" one:

    [symtab-create] start_subfile: name = /dir/d/dw2-compdir-oldgcc42.S
    [symtab-create] start_subfile: name = dw2-compdir-oldgcc42.S
    [symtab-create] start_subfile: name = dw2-compdir-oldgcc42.S
    [symtab-create] start_subfile: found existing symtab with name dw2-compdir-oldgcc42.S (dw2-compdir-oldgcc42.S)
    [symtab-create] watch_main_source_file_lossage: using subfile dw2-compdir-oldgcc42.S as the main subfile

And so "info source" would show "dw2-compdir-oldgcc42.S" as the
filename.

With my patch applied, but without the change in
find_file_and_directory, both DW_AT_name and the line table would try to
start a subfile with the same filename_for_id, and there was no need for
watch_main_source_file_lossage - which is what we want:

[symtab-create] start_subfile: name = /dir/d/dw2-compdir-oldgcc42.S, name_for_id = /dir/d/dw2-compdir-oldgcc42.S
[symtab-create] start_subfile: name = dw2-compdir-oldgcc42.S, name_for_id = /dir/d/dw2-compdir-oldgcc42.S
[symtab-create] start_subfile: found existing symtab with name_for_id /dir/d/dw2-compdir-oldgcc42.S (/dir/d/dw2-compdir-oldgcc42.S)
[symtab-create] start_subfile: name = dw2-compdir-oldgcc42.S, name_for_id = /dir/d/dw2-compdir-oldgcc42.S
[symtab-create] start_subfile: found existing symtab with name_for_id /dir/d/dw2-compdir-oldgcc42.S (/dir/d/dw2-compdir-oldgcc42.S)

But since the one with name == "/dir/d/dw2-compdir-oldgcc42.S", coming
from DW_AT_name, gets created first, it wins, and the symtab ends up
with "/dir/d/dw2-compdir-oldgcc42.S" as the name, "info source" shows
"/dir/d/dw2-compdir-oldgcc42.S" and the test breaks.

This is not wrong per-se, after all DW_AT_name is
"/dir/d/dw2-compdir-oldgcc42.S", so it wouldn't be wrong to report the
current source file as "/dir/d/dw2-compdir-oldgcc42.S".  If you compile
a file passing "/an/absolute/path.c", DW_AT_name typically contains (at
least with GCC) "/an/absolute/path.c" and GDB tells you that the source
file is "/an/absolute/path.c".  But we can also keep the existing
behavior fairly easily with a little change in find_file_and_directory.
When extracting an artificial DW_AT_comp_dir from DW_AT_name, we now
modify the name to just keep the file part.  The result is coherent with
what compilers do when you compile a file by just passing its filename
("gcc path.c -g"):

      DW_AT_name        ("path.c")
      DW_AT_comp_dir    ("/home/simark/build/binutils-gdb-one-target/gdb")

With this change, filename_for_id is still the full name,
"/dir/d/dw2-compdir-oldgcc42.S", but the filename of the subfile /
symtab (what ends up shown by "info source") is just
"dw2-compdir-oldgcc42.S", and that makes the test happy.

Change-Id: I8b5cc4bb3052afdb172ee815c051187290566307
 2022-07-29 20:54:49 -04:00
Tom de Vries
3da5576c91 [gdb/symtab] Add dwarf2_cu::lang () 
The cu->per_cu->lang field was added to carry information from the initial
partial symtabs phase to the symtab expansion phase, for the benefit of a
particular optimization in process_imported_unit_die.

Other uses have been added, but since the first phase now has been
parallelized, those have become problematic and sources of race conditions.

Fix this by adding dwarf2_cu::lang () and using it where we can to replace
cu->per_cu->lang () with cu->lang ().

Also assert in dwarf2_cu::lang () that we're not returning language_unknown.

Tested on x86_64-linux.
 2022-07-12 17:12:17 +02:00
Tom de Vries
2c474c4694 [gdb/symtab] Add get/set functions for per_cu->lang/unit_type 
The dwarf2_per_cu_data fields lang and unit_type both have a dont-know
initial value (respectively language_unknown and (dwarf_unit_type)0), which
allows us to add certain checks, f.i. checking that that a field is not read
before written.

Add get/set member functions for the two fields as a convenient location to
add such checks, make the fields private to enforce using the member
functions, and add the m_ prefix.

Tested on x86_64-linux.
 2022-07-04 10:28:42 +02:00
Tom Tromey
6209cde4dd Delete DWARF psymtab code 
This removes the DWARF psymtab reader.
 2022-04-12 09:31:17 -06:00
Simon Marchi
59dfe8ad84 gdb: rename start_symtab/end_symtab to start_compunit_symtab/end_compunit_symtab 
It's a bit confusing because we have both "compunit_symtab" and "symtab"
types, and many methods and functions containing "start_symtab" or
"end_symtab", which actually deal with compunit_symtabs.  I believe this
comes from the time before compunit_symtab was introduced, where
symtab did the job of both.

Rename everything I found containing start_symtab or end_symtab to use
start_compunit_symtab or end_compunit_symtab.

Change-Id: If3849b156f6433640173085ad479b6a0b085ade2
 2022-04-04 12:58:07 -04:00
Simon Marchi
dfa1952ee8 gdb: work around negative DW_AT_data_member_location GCC 11 bug 
g++ 11.1.0 has a bug where it will emit a negative
DW_AT_data_member_location in some cases:

    $ cat test.cpp
    #include <memory>

    int
    main()
    {
      std::unique_ptr<int> ptr;
    }
    $ g++ -g test.cpp
    $ llvm-dwarfdump -F a.out
    ...
    0x00000964:       DW_TAG_member
                        DW_AT_name [DW_FORM_strp]   ("_M_head_impl")
                        DW_AT_decl_file [DW_FORM_data1]     ("/usr/include/c++/11.1.0/tuple")
                        DW_AT_decl_line [DW_FORM_data1]     (125)
                        DW_AT_decl_column [DW_FORM_data1]   (0x27)
                        DW_AT_type [DW_FORM_ref4]   (0x0000067a "default_delete<int>")
                        DW_AT_data_member_location [DW_FORM_sdata]  (-1)
    ...

This leads to a GDB crash (when built with ASan, otherwise probably
garbage results), since it tries to read just before (to the left, in
ASan speak) of the value's buffer:

    ==888645==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x6020000c52af at pc 0x7f711b239f4b bp 0x7fff356bd470 sp 0x7fff356bcc18
    READ of size 1 at 0x6020000c52af thread T0
         0x7f711b239f4a in __interceptor_memcpy /build/gcc/src/gcc/libsanitizer/sanitizer_common/sanitizer_common_interceptors.inc:827
         0x555c4977efa1 in value_contents_copy_raw /home/simark/src/binutils-gdb/gdb/value.c:1347
         0x555c497909cd in value_primitive_field(value*, long, int, type*) /home/simark/src/binutils-gdb/gdb/value.c:3126
         0x555c478f2eaa in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:333
         0x555c478f63b2 in cp_print_value /home/simark/src/binutils-gdb/gdb/cp-valprint.c:513
         0x555c478f02ca in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:161
         0x555c478f63b2 in cp_print_value /home/simark/src/binutils-gdb/gdb/cp-valprint.c:513
         0x555c478f02ca in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:161
         0x555c478f63b2 in cp_print_value /home/simark/src/binutils-gdb/gdb/cp-valprint.c:513
         0x555c478f02ca in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:161
         0x555c4760d45f in c_value_print_struct /home/simark/src/binutils-gdb/gdb/c-valprint.c:383
         0x555c4760df4c in c_value_print_inner(value*, ui_file*, int, value_print_options const*) /home/simark/src/binutils-gdb/gdb/c-valprint.c:438
         0x555c483ff9a7 in language_defn::value_print_inner(value*, ui_file*, int, value_print_options const*) const /home/simark/src/binutils-gdb/gdb/language.c:632
         0x555c49758b68 in do_val_print /home/simark/src/binutils-gdb/gdb/valprint.c:1048
         0x555c49759b17 in common_val_print(value*, ui_file*, int, value_print_options const*, language_defn const*) /home/simark/src/binutils-gdb/gdb/valprint.c:1151
         0x555c478f2fcb in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:335
         0x555c478f63b2 in cp_print_value /home/simark/src/binutils-gdb/gdb/cp-valprint.c:513
         0x555c478f02ca in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:161
         0x555c4760d45f in c_value_print_struct /home/simark/src/binutils-gdb/gdb/c-valprint.c:383
         0x555c4760df4c in c_value_print_inner(value*, ui_file*, int, value_print_options const*) /home/simark/src/binutils-gdb/gdb/c-valprint.c:438
         0x555c483ff9a7 in language_defn::value_print_inner(value*, ui_file*, int, value_print_options const*) const /home/simark/src/binutils-gdb/gdb/language.c:632
         0x555c49758b68 in do_val_print /home/simark/src/binutils-gdb/gdb/valprint.c:1048
         0x555c49759b17 in common_val_print(value*, ui_file*, int, value_print_options const*, language_defn const*) /home/simark/src/binutils-gdb/gdb/valprint.c:1151
         0x555c478f2fcb in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:335
         0x555c4760d45f in c_value_print_struct /home/simark/src/binutils-gdb/gdb/c-valprint.c:383
         0x555c4760df4c in c_value_print_inner(value*, ui_file*, int, value_print_options const*) /home/simark/src/binutils-gdb/gdb/c-valprint.c:438
         0x555c483ff9a7 in language_defn::value_print_inner(value*, ui_file*, int, value_print_options const*) const /home/simark/src/binutils-gdb/gdb/language.c:632
         0x555c49758b68 in do_val_print /home/simark/src/binutils-gdb/gdb/valprint.c:1048
         0x555c49759b17 in common_val_print(value*, ui_file*, int, value_print_options const*, language_defn const*) /home/simark/src/binutils-gdb/gdb/valprint.c:1151
         0x555c4760f04c in c_value_print(value*, ui_file*, value_print_options const*) /home/simark/src/binutils-gdb/gdb/c-valprint.c:587
         0x555c483ff954 in language_defn::value_print(value*, ui_file*, value_print_options const*) const /home/simark/src/binutils-gdb/gdb/language.c:614
         0x555c49759f61 in value_print(value*, ui_file*, value_print_options const*) /home/simark/src/binutils-gdb/gdb/valprint.c:1189
         0x555c48950f70 in print_formatted /home/simark/src/binutils-gdb/gdb/printcmd.c:337
         0x555c48958eda in print_value(value*, value_print_options const&) /home/simark/src/binutils-gdb/gdb/printcmd.c:1258
         0x555c48959891 in print_command_1 /home/simark/src/binutils-gdb/gdb/printcmd.c:1367
         0x555c4895a3df in print_command /home/simark/src/binutils-gdb/gdb/printcmd.c:1458
         0x555c4767f974 in do_simple_func /home/simark/src/binutils-gdb/gdb/cli/cli-decode.c:97
         0x555c47692e25 in cmd_func(cmd_list_element*, char const*, int) /home/simark/src/binutils-gdb/gdb/cli/cli-decode.c:2475
         0x555c4936107e in execute_command(char const*, int) /home/simark/src/binutils-gdb/gdb/top.c:670
         0x555c485f1bff in catch_command_errors /home/simark/src/binutils-gdb/gdb/main.c:523
         0x555c485f249c in execute_cmdargs /home/simark/src/binutils-gdb/gdb/main.c:618
         0x555c485f6677 in captured_main_1 /home/simark/src/binutils-gdb/gdb/main.c:1317
         0x555c485f6c83 in captured_main /home/simark/src/binutils-gdb/gdb/main.c:1338
         0x555c485f6d65 in gdb_main(captured_main_args*) /home/simark/src/binutils-gdb/gdb/main.c:1363
         0x555c46e41ba8 in main /home/simark/src/binutils-gdb/gdb/gdb.c:32
         0x7f71198bcb24 in __libc_start_main (/usr/lib/libc.so.6+0x27b24)
         0x555c46e4197d in _start (/home/simark/build/binutils-gdb-one-target/gdb/gdb+0x77f197d)

    0x6020000c52af is located 1 bytes to the left of 8-byte region [0x6020000c52b0,0x6020000c52b8)
    allocated by thread T0 here:
         0x7f711b2b7459 in __interceptor_calloc /build/gcc/src/gcc/libsanitizer/asan/asan_malloc_linux.cpp:154
         0x555c470acdc9 in xcalloc /home/simark/src/binutils-gdb/gdb/alloc.c:100
         0x555c49b775cd in xzalloc(unsigned long) /home/simark/src/binutils-gdb/gdbsupport/common-utils.cc:29
         0x555c4977bdeb in allocate_value_contents /home/simark/src/binutils-gdb/gdb/value.c:1029
         0x555c4977be25 in allocate_value(type*) /home/simark/src/binutils-gdb/gdb/value.c:1040
         0x555c4979030d in value_primitive_field(value*, long, int, type*) /home/simark/src/binutils-gdb/gdb/value.c:3092
         0x555c478f6280 in cp_print_value /home/simark/src/binutils-gdb/gdb/cp-valprint.c:501
         0x555c478f02ca in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:161
         0x555c478f63b2 in cp_print_value /home/simark/src/binutils-gdb/gdb/cp-valprint.c:513
         0x555c478f02ca in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:161
         0x555c478f63b2 in cp_print_value /home/simark/src/binutils-gdb/gdb/cp-valprint.c:513
         0x555c478f02ca in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:161
         0x555c4760d45f in c_value_print_struct /home/simark/src/binutils-gdb/gdb/c-valprint.c:383
         0x555c4760df4c in c_value_print_inner(value*, ui_file*, int, value_print_options const*) /home/simark/src/binutils-gdb/gdb/c-valprint.c:438
         0x555c483ff9a7 in language_defn::value_print_inner(value*, ui_file*, int, value_print_options const*) const /home/simark/src/binutils-gdb/gdb/language.c:632
         0x555c49758b68 in do_val_print /home/simark/src/binutils-gdb/gdb/valprint.c:1048
         0x555c49759b17 in common_val_print(value*, ui_file*, int, value_print_options const*, language_defn const*) /home/simark/src/binutils-gdb/gdb/valprint.c:1151
         0x555c478f2fcb in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:335
         0x555c478f63b2 in cp_print_value /home/simark/src/binutils-gdb/gdb/cp-valprint.c:513
         0x555c478f02ca in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:161
         0x555c4760d45f in c_value_print_struct /home/simark/src/binutils-gdb/gdb/c-valprint.c:383
         0x555c4760df4c in c_value_print_inner(value*, ui_file*, int, value_print_options const*) /home/simark/src/binutils-gdb/gdb/c-valprint.c:438
         0x555c483ff9a7 in language_defn::value_print_inner(value*, ui_file*, int, value_print_options const*) const /home/simark/src/binutils-gdb/gdb/language.c:632
         0x555c49758b68 in do_val_print /home/simark/src/binutils-gdb/gdb/valprint.c:1048
         0x555c49759b17 in common_val_print(value*, ui_file*, int, value_print_options const*, language_defn const*) /home/simark/src/binutils-gdb/gdb/valprint.c:1151
         0x555c478f2fcb in cp_print_value_fields(value*, ui_file*, int, value_print_options const*, type**, int) /home/simark/src/binutils-gdb/gdb/cp-valprint.c:335
         0x555c4760d45f in c_value_print_struct /home/simark/src/binutils-gdb/gdb/c-valprint.c:383
         0x555c4760df4c in c_value_print_inner(value*, ui_file*, int, value_print_options const*) /home/simark/src/binutils-gdb/gdb/c-valprint.c:438
         0x555c483ff9a7 in language_defn::value_print_inner(value*, ui_file*, int, value_print_options const*) const /home/simark/src/binutils-gdb/gdb/language.c:632
         0x555c49758b68 in do_val_print /home/simark/src/binutils-gdb/gdb/valprint.c:1048

Since there are some binaries with this in the wild, I think it would be
useful for GDB to work around this.  I did the obvious simple thing, if
the DW_AT_data_member_location's value is -1, replace it with 0.  I
added a producer check to only apply this fixup for GCC 11.  The idea is
that if some other compiler ever uses a DW_AT_data_member_location value
of -1 by mistake, we don't know (before analyzing the bug at least) if
they did mean 0 or some other value.  So I wouldn't want to apply the
fixup in that case.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28063
Change-Id: Ieef3459b0b9bbce8bdad838ba83b4b64e7269d42
 2022-01-27 17:35:26 -05:00
Joel Brobecker
4a94e36819 Automatic Copyright Year update after running gdb/copyright.py 
This commit brings all the changes made by running gdb/copyright.py
as per GDB's Start of New Year Procedure.

For the avoidance of doubt, all changes in this commits were
performed by the script.
 2022-01-01 19:13:23 +04:00
Simon Marchi
ab557072b8 gdb: use actual DWARF version in compunit's debugformat field 
The "info source" command, with a DWARF-compile program, always show
that the debug info is "DWARF 2":

    (gdb) info source
    Current source file is test.c
    Compilation directory is /home/smarchi/build/binutils-gdb/gdb
    Located in /home/smarchi/build/binutils-gdb/gdb/test.c
    Contains 2 lines.
    Source language is c.
    Producer is GNU C17 9.3.0 -mtune=generic -march=x86-64 -g3 -gdwarf-5 -O0 -fasynchronous-unwind-tables -fstack-protector-strong -fstack-clash-protection -fcf-protection.
    Compiled with DWARF 2 debugging format.
    Includes preprocessor macro info.

Change it to display the actual DWARF version:

    (gdb) info source
    Current source file is test.c
    Compilation directory is /home/smarchi/build/binutils-gdb/gdb
    Located in /home/smarchi/build/binutils-gdb/gdb/test.c
    Contains 2 lines.
    Source language is c.
    Producer is GNU C17 9.3.0 -mtune=generic -march=x86-64 -g3 -gdwarf-5 -O0 -fasynchronous-unwind-tables -fstack-protector-strong -fstack-clash-protection -fcf-protection.
    Compiled with DWARF 5 debugging format.
    Includes preprocessor macro info.

The comp_unit_head::version field is guaranteed to be between 2 and 5,
thanks to the check in read_comp_unit_head.  So we can still use static
strings to pass to record_debugformat, and keep it efficient.

In the future, when somebody will update GDB to support DWARF 6, they'll
hit this assert and have to update this code.

Change-Id: I3270b7ebf5e9a17b4215405bd2e365662a4d6172
 2021-12-01 21:50:31 -05:00
Weimin Pan
b3a01ce215 CTF: incorrect underlying type setting for enumeration types 
A bug was filed against the incorrect underlying type setting for
an enumeration type, which was caused by a copy and paste error.
This patch fixes the problem by setting it by calling objfile_int_type,
which was originally dwarf2_per_objfile::int_type, with ctf_type_size bits.
Also add error checking on ctf_func_type_info call.
 2021-10-18 14:15:21 -04:00
Tom Tromey
3e9f1ca148 Remove dwarf2_cu::language 
dwarf2_cu has a 'language' value, but dwarf2_per_cu_data also holds a
value of this same type.  There doesn't seem to be any reason to keep
two copies of this value.  This patch removes the field from
dwarf2_cu, and arranges to set the value in the per-CU object instead.

Note that the value must still be set when expanding the full CU.
This is needed because the CUs will not be scanned when a DWARF index
is in use.

gdb/ChangeLog
2021-06-25  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (process_psymtab_comp_unit): Don't set 'lang'.
	(scan_partial_symbols, partial_die_parent_scope)
	(add_partial_symbol, add_partial_subprogram)
	(compute_delayed_physnames, rust_union_quirks)
	(process_full_comp_unit, process_full_type_unit)
	(process_imported_unit_die, process_die, dw2_linkage_name)
	(dwarf2_compute_name, dwarf2_physname, read_import_statement)
	(read_file_scope, queue_and_load_dwo_tu, read_func_scope)
	(read_variable, dwarf2_get_subprogram_pc_bounds)
	(dwarf2_attach_fields_to_type, dwarf2_add_member_fn)
	(dwarf2_attach_fn_fields_to_type)
	(quirk_ada_thick_pointer_struct, read_structure_type)
	(handle_struct_member_die, process_structure_scope)
	(read_array_type, read_array_order, prototyped_function_p)
	(read_subroutine_type, dwarf2_init_complex_target_type)
	(read_base_type, read_subrange_type, read_unspecified_type)
	(load_partial_dies, partial_die_info::fixup, set_cu_language)
	(new_symbol, need_gnat_info, determine_prefix, typename_concat)
	(dwarf2_canonicalize_name, follow_die_offset)
	(prepare_one_comp_unit): Update.
	* dwarf2/cu.c (dwarf2_cu::start_symtab): Update.
 2021-06-25 12:23:05 -06:00
Tom de Vries
8457e5ecc4 [gdb/symtab] Fix infinite recursion in dwarf2_cu::get_builder(), again 
This is another attempt at fixing the problem described in commit 4cf88725da1
"[gdb/symtab] Fix infinite recursion in dwarf2_cu::get_builder()", which was
reverted in commit 3db19b2d724.

First off, some context.

A DWARF CU can be viewed as a symbol table: toplevel children of a CU DIE
represent symbol table entries for that CU.  Furthermore, there is a
hierarchy: a symbol table entry such as a function itself has a symbol table
containing parameters and local variables.

The dwarf reader maintains a notion of current symbol table (that is: the
symbol table a new symbol needs to be entered into) in dwarf2_cu member
list_in_scope.

A problem then presents itself when reading inter-CU references:
- a new symbol read from a CU B needs to be entered into the symbol table of
  another CU A.
- the notion of current symbol table is tracked on a per-CU basis.
This is addressed in inherit_abstract_dies by temporarily overwriting the
list_in_scope for CU B with the one for CU A.

The current symbol table is one aspect of the current dwarf reader context
that is tracked, but there are more, f.i. ones that are tracked via the
dwarf2_cu member m_builder, f.i. m_builder->m_local_using_directives.

A similar problem exists in relation to inter-CU references, but a different
solution was chosen:
- to keep track of an ancestor field in dwarf2_cu, which is updated
  when traversing inter-CU references, and
- to use the ancestor field in dwarf2_cu::get_builder to return the m_builder
  in scope.

There is no actual concept of a CU having an ancestor, it just marks the most
recent CU from which a CU was inter-CU-referenced.  Consequently, when
following inter-CU references from a CU A to another CU B and back to CU A,
the ancestors form a cycle, which causes dwarf2_cu::get_builder to hang or
segfault, as reported in PR26327.

ISTM that the ancestor implementation is confusing and fragile, and should
go.  Furthermore, it seems that keeping track of the m_builder in scope can be
handled simply with a per-objfile variable.

Fix the hang / segfault by:
- keeping track of the m_builder in scope using a new variable
  per_obj->sym_cu, and
- using it in dwarf2_cu::get_builder.

Tested on x86_64-linux (openSUSE Leap 15.2), no regressions for config:
- using default gcc version 7.5.0
  (with 5 unexpected FAILs)
- gcc 10.3.0 and target board
  unix/-flto/-O0/-flto-partition=none/-ffat-lto-objects
  (with 1000 unexpected FAILs)

gdb/ChangeLog:

2021-06-16  Tom de Vries  <tdevries@suse.de>

	PR symtab/26327
	* dwarf2/cu.h (dwarf2_cu::ancestor): Remove.
	(dwarf2_cu::get_builder): Declare and move ...
	* dwarf2/cu.c (dwarf2_cu::get_builder): ... here.  Use sym_cu instead
	of ancestor.  Assert return value is non-null.
	* dwarf2/read.c (read_file_scope): Set per_objfile->sym_cu.
	(follow_die_offset, follow_die_sig_1): Remove setting of ancestor.
	(dwarf2_per_objfile): Add sym_cu field.
 2021-06-16 12:44:30 +02:00
Tom de Vries
6dcd1193d9 [gdb/symtab] Fix Dwarf Error: cannot find DIE 
When loading the debug info package
libLLVM.so.10-10.0.1-lp152.30.4.x86_64.debug from openSUSE Leap 15.2, we
run into a dwarf error:
...
$ gdb -q -batch libLLVM.so.10-10.0.1-lp152.30.4.x86_64.debug
Dwarf Error: Cannot not find DIE at 0x18a936e7 \
  [from module libLLVM.so.10-10.0.1-lp152.30.4.x86_64.debug]
...
The DIE @ 0x18a936e7 does in fact exist, and is part of a CU @ 0x18a23e52.
No error message is printed when using -readnow.

What happens is the following:
- a dwarf2_per_cu_data P is created for the CU.
- a dwarf2_cu A is created for the same CU.
- another dwarf2_cu B is created for the same CU.
- the dwarf2_cu B is set in per_objfile->m_dwarf2_cus, such that
  per_objfile->get_cu (P) returns B.
- P->load_all_dies is set to 1.
- all dies are read into the A->partial_dies htab
- dwarf2_cu A is destroyed.
- we try to find the partial_die for the DIE @ 0x18a936e7 in B->partial_dies.
  We can't find it, but do not try to load all dies, because P->load_all_dies
  is already set to 1.
- an error message is generated.

The question is why we're creating dwarf2_cu A and B for the same CU.

The dwarf2_cu A is created here:
...
 (gdb) bt
   dwarf2_cu::dwarf2_cu (this=0x79a9660, per_cu=0x23c0b30,
     per_objfile=0x1ad01b0) at dwarf2/cu.c:38
   0x0000000000675799 in cutu_reader::cutu_reader (this=0x7fffffffd040,
     this_cu=0x23c0b30, per_objfile=0x1ad01b0, abbrev_table=0x0,
     existing_cu=0x0, skip_partial=false) at dwarf2/read.c:6487
   0x0000000000676eb3 in process_psymtab_comp_unit (this_cu=0x23c0b30,
      per_objfile=0x1ad01b0, want_partial_unit=false,
      pretend_language=language_minimal) at dwarf2/read.c:7028
...

And the dwarf2_cu B is created here:
...
 (gdb) bt
   dwarf2_cu::dwarf2_cu (this=0x885e8c0, per_cu=0x23c0b30,
     per_objfile=0x1ad01b0) at dwarf2/cu.c:38
   0x0000000000675799 in cutu_reader::cutu_reader (this=0x7fffffffcc50,
     this_cu=0x23c0b30, per_objfile=0x1ad01b0, abbrev_table=0x0,
     existing_cu=0x0, skip_partial=false) at dwarf2/read.c:6487
   0x0000000000678118 in load_partial_comp_unit (this_cu=0x23c0b30,
     per_objfile=0x1ad01b0, existing_cu=0x0) at dwarf2/read.c:7436
   0x000000000069721d in find_partial_die (sect_off=(unknown: 0x18a55054),
     offset_in_dwz=0, cu=0x0) at dwarf2/read.c:19391
   0x000000000069755b in partial_die_info::fixup (this=0x9096900,
     cu=0xa6a85f0) at dwarf2/read.c:19512
   0x0000000000697586 in partial_die_info::fixup (this=0x8629bb0,
     cu=0xa6a85f0) at dwarf2/read.c:19516
   0x00000000006787b1 in scan_partial_symbols (first_die=0x8629b40,
     lowpc=0x7fffffffcf58, highpc=0x7fffffffcf50, set_addrmap=0, cu=0x79a9660)
     at dwarf2/read.c:7563
   0x0000000000678878 in scan_partial_symbols (first_die=0x796ebf0,
     lowpc=0x7fffffffcf58, highpc=0x7fffffffcf50, set_addrmap=0, cu=0x79a9660)
     at dwarf2/read.c:7580
   0x0000000000676b82 in process_psymtab_comp_unit_reader
     (reader=0x7fffffffd040, info_ptr=0x7fffc1b3f29b, comp_unit_die=0x6ea90f0,
     pretend_language=language_minimal) at dwarf2/read.c:6954
   0x0000000000676ffd in process_psymtab_comp_unit (this_cu=0x23c0b30,
     per_objfile=0x1ad01b0, want_partial_unit=false,
     pretend_language=language_minimal) at dwarf2/read.c:7057
...

So in frame , a cutu_reader is created with dwarf2_cu A.  Then a fixup takes
us to the following CU @ 0x18aa33d6, in frame .  And a similar fixup in
frame  takes us back to CU @ 0x18a23e52.  At that point, there's no
information available that we're already trying to read that CU, and we end up
creating another cutu_reader with dwarf2_cu B.

It seems that there are two related problems:
- creating two dwarf2_cu's is not optimal
- the unoptimal case is not handled correctly

This patch addresses the last problem, by moving the load_all_dies flag from
dwarf2_per_cu_data to dwarf2_cu, such that it is paired with the partial_dies
field, which ensures that the two can be kept in sync.

Tested on x86_64-linux.

gdb/ChangeLog:

2021-05-27  Tom de Vries  <tdevries@suse.de>

	PR symtab/27898
	* dwarf2/cu.c (dwarf2_cu::dwarf2_cu): Add load_all_dies init.
	* dwarf2/cu.h (dwarf2_cu): Add load_all_dies field.
	* dwarf2/read.c (load_partial_dies, find_partial_die): Update.
	* dwarf2/read.h (dwarf2_per_cu_data::dwarf2_per_cu_data): Remove
	load_all_dies init.
	(dwarf2_per_cu_data): Remove load_all_dies field.
 2021-05-27 15:22:38 +02:00
Tom Tromey
347212b819 Change dwarf2_cu marking to use methods 
This changes the dwarf2_cu marking functions to be methods on
dwarf2_cu.

gdb/ChangeLog
2021-05-17  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (maybe_queue_comp_unit)
	(dwarf2_per_objfile::age_comp_units): Update.
	(dwarf2_add_dependence, dwarf2_mark_helper, dwarf2_mark): Move to
	dwarf2_cu methods.
	* dwarf2/cu.h (struct dwarf2_cu) <mark, clear_mark, is_marked,
	add_dependence>: New methods.
	<m_dependencies>: Add "m_" prefix.  Now private.
	<m_mark>: Add "m_" prefix.
	* dwarf2/cu.c (dwarf2_cu::dwarf2_cu): Update.
	(dwarf2_mark_helper): New function.
	(dwarf2_cu::mark, dwarf2_cu::add_dependence): New methods.
 2021-05-17 14:16:06 -06:00
Tom Tromey
839118f920 Move some dwarf2_cu methods to new file 
This moves some of the dwarf2_cu methods to a new file, dwarf2/cu.c.

gdb/ChangeLog
2021-05-17  Tom Tromey  <tom@tromey.com>

	* dwarf2/read.c (dwarf2_cu::addr_sized_int_type)
	(dwarf2_cu::start_symtab, dwarf2_cu::addr_type)
	(dwarf2_cu::dwarf2_cu): Move to cu.c.
	* dwarf2/cu.c: New file.
	* Makefile.in (COMMON_SFILES): Add dwarf2/cu.c.
 2021-05-17 14:16:06 -06:00