libctf, ld: dump enums: generally improve dump formatting

libctf, ld: dump enums: generally improve dump formatting

This commit adds dumping of enumerands in this general form:

    0x3: (kind 8) enum eleven_els (size 0x4) (aligned at 0x4)
         ELEVEN_ONE: 10
         ELEVEN_TWO: 11
         ELEVEN_THREE: -256
         ELEVEN_FOUR: -255
         ELEVEN_FIVE: -254
         ...
         ELEVEN_SEVEN: -252
         ELEVEN_EIGHT: -251
         ELEVEN_NINE: -250
         ELEVEN_TEN: -249
         ELEVEN_ELEVEN: -248

The first and last enumerands in the enumerated type are printed so that
you can tell if they've been cut off at one end or the other.  (For now,
there is no way to control how many enumerands are printed.)

The dump output in general is improved, from this sort of thing a few
days ago:

     4c: char [0x0:0x8] (size 0x1)
        [0x0] (ID 0x4c) (kind 1) char:8 (aligned at 0x1, format 0x3, offset:bits 0x0:0x8)
     4d: char * (size 0x8) -> 4c: char [0x0:0x8] (size 0x1)
        [0x0] (ID 0x4d) (kind 3) char * (aligned at 0x8)
[...]
     5a: struct _IO_FILE (size 0xd8)
        [0x0] (ID 0x5a) (kind 6) struct _IO_FILE (aligned at 0x4)
            [0x0] (ID 0x3) (kind 1) int _flags:32 (aligned at 0x4, format 0x1, offset:bits 0x0:0x20)
            [0x40] (ID 0x4d) (kind 3) char * _IO_read_ptr (aligned at 0x8)
            [0x80] (ID 0x4d) (kind 3) char * _IO_read_end (aligned at 0x8)
            [0xc0] (ID 0x4d) (kind 3) char * _IO_read_base (aligned at 0x8)
     5b: __FILE (size 0xd8) -> 5a: struct _IO_FILE (size 0xd8)
        [0x0] (ID 0x5b) (kind 10) __FILE (aligned at 0x4)
            [0x0] (ID 0x3) (kind 1) int _flags:32 (aligned at 0x4, format 0x1, offset:bits 0x0:0x20)
            [0x40] (ID 0x4d) (kind 3) char * _IO_read_ptr (aligned at 0x8)
            [0x80] (ID 0x4d) (kind 3) char * _IO_read_end (aligned at 0x8)
            [0xc0] (ID 0x4d) (kind 3) char * _IO_read_base (aligned at 0x8)
[...]
     406: struct coff_link_hash_entry (size 0x60)
        [0x0] (ID 0x406) (kind 6) struct coff_link_hash_entry (aligned at 0x8)
            [0x0] (ID 0x2b3) (kind 6) struct bfd_link_hash_entry root (aligned at 0x8)
                [0x0] (ID 0x1d6) (kind 6) struct bfd_hash_entry root (aligned at 0x8)
                    [0x0] (ID 0x1d7) (kind 3) struct bfd_hash_entry * next (aligned at 0x8)
                    [0x40] (ID 0x61) (kind 3) const char * string (aligned at 0x8)
                    [0x80] (ID 0x1) (kind 1) long unsigned int hash:64 (aligned at 0x8, format 0x0, offset:bits 0x0:0x40)
                [0xc0] (ID 0x397) (kind 8) enum bfd_link_hash_type  type:8 (aligned at 0x1, format 0x0, offset:bits 0x0:0x8)
                [0xc8] (ID 0x1c7) (kind 1) unsigned int  non_ir_ref_regular:1 (aligned at 0x1, format 0x0, offset:bits 0x8:0x1)
                [0xc9] (ID 0x1c8) (kind 1) unsigned int  non_ir_ref_dynamic:1 (aligned at 0x1, format 0x0, offset:bits 0x9:0x1)
                [0xca] (ID 0x1c9) (kind 1) unsigned int  linker_def:1 (aligned at 0x1, format 0x0, offset:bits 0xa:0x1)
                [0xcb] (ID 0x1ca) (kind 1) unsigned int  ldscript_def:1 (aligned at 0x1, format 0x0, offset:bits 0xb:0x1)
                [0xcc] (ID 0x1cb) (kind 1) unsigned int  rel_from_abs:1 (aligned at 0x1, format 0x0, offset:bits 0xc:0x1)

... to this:

    0x4c: (kind 1) char (format 0x3) (size 0x1) (aligned at 0x1)
    0x4d: (kind 3) char * (size 0x8) (aligned at 0x8) -> 0x4c: (kind 1) char (format 0x3) (size 0x1) (aligned at 0x1)
    0x5a: (kind 6) struct _IO_FILE (size 0xd8) (aligned at 0x4)
          [0x0] _flags: ID 0x3: (kind 1) int (format 0x1) (size 0x4) (aligned at 0x4)
          [0x40] _IO_read_ptr: ID 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8)
          [0x80] _IO_read_end: ID 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8)
          [0xc0] _IO_read_base: ID 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8)
          [0x100] _IO_write_base: ID 0x4d: (kind 3) char * (size 0x8) (aligned at 0x8)
    0x5b: (kind 10) __FILE (size 0xd8) (aligned at 0x4) -> 0x5a: (kind 6) struct _IO_FILE (size 0xd8) (aligned at 0x4)
[...]
    0x406: (kind 6) struct coff_link_hash_entry (size 0x60) (aligned at 0x8)
           [0x0] root: ID 0x2b3: (kind 6) struct bfd_link_hash_entry (size 0x38) (aligned at 0x8)
               [0x0] root: ID 0x1d6: (kind 6) struct bfd_hash_entry (size 0x18) (aligned at 0x8)
                   [0x0] next: ID 0x1d7: (kind 3) struct bfd_hash_entry * (size 0x8) (aligned at 0x8)
                   [0x40] string: ID 0x61: (kind 3) const char * (size 0x8) (aligned at 0x8)
                   [0x80] hash: ID 0x1: (kind 1) long unsigned int (format 0x0) (size 0x8) (aligned at 0x8)
               [0xc0] type: ID 0x397: (kind 8) enum bfd_link_hash_type (format 0x7f2e) (size 0x1) (aligned at 0x1)
               [0xc8] non_ir_ref_regular: ID 0x1c7: (kind 1) unsigned int:1 [slice 0x8:0x1] (format 0x0) (size 0x1) (aligned at 0x1)
               [0xc9] non_ir_ref_dynamic: ID 0x1c8: (kind 1) unsigned int:1 [slice 0x9:0x1] (format 0x0) (size 0x1) (aligned at 0x1)
               [0xca] linker_def: ID 0x1c9: (kind 1) unsigned int:1 [slice 0xa:0x1] (format 0x0) (size 0x1) (aligned at 0x1)
               [0xcb] ldscript_def: ID 0x1ca: (kind 1) unsigned int:1 [slice 0xb:0x1] (format 0x0) (size 0x1) (aligned at 0x1)
               [0xcc] rel_from_abs: ID 0x1cb: (kind 1) unsigned int:1 [slice 0xc:0x1] (format 0x0) (size 0x1) (aligned at 0x1)
[...]

In particular, indented subsections are only present for actual structs
and unions, not forwards to them, and the structure itself doesn't add a
spurious level of indentation; structure field names are easier to spot
(at the cost of not making them look so much like C field declarations
any more, but they weren't always shown in valid decl syntax even before
this change) the size, type kind, and alignment are shown for all types
for which they are meaningful; bitfield info is only shown for actual
bitfields within structures and not ordinary integral fields; and type
IDs are never omitted.  Type printing is in general much more consistent
and there is much less duplicated code in the type dumper.

There is one user-visible effect outside the dumper: ctf_type_(a)name
was erroneously emitting a trailing space on the name of slice types,
even though a slice of an int and an int with the corresponding encoding
represent the same type and should have the same print form.  This
trailing space is now gone.

ld/ChangeLog
2021-01-05  Nick Alcock  <nick.alcock@oracle.com>

	* testsuite/ld-ctf/array.d: Adjust for dumper changes.
	* testsuite/ld-ctf/conflicting-cycle-1.B-1.d: Likewise.
	* testsuite/ld-ctf/conflicting-cycle-1.B-2.d: Likewise.
	* testsuite/ld-ctf/conflicting-cycle-1.parent.d: Likewise.
	* testsuite/ld-ctf/conflicting-cycle-2.A-1.d: Likewise.
	* testsuite/ld-ctf/conflicting-cycle-2.A-2.d: Likewise.
	* testsuite/ld-ctf/conflicting-cycle-2.parent.d: Likewise.
	* testsuite/ld-ctf/conflicting-cycle-3.C-1.d: Likewise.
	* testsuite/ld-ctf/conflicting-cycle-3.C-2.d: Likewise.
	* testsuite/ld-ctf/conflicting-cycle-3.parent.d: Likewise.
	* testsuite/ld-ctf/conflicting-enums.d: Likewise.
	* testsuite/ld-ctf/conflicting-typedefs.d: Likewise.
	* testsuite/ld-ctf/cross-tu-cyclic-conflicting.d: Likewise.
	* testsuite/ld-ctf/cross-tu-cyclic-nonconflicting.d: Likewise.
	* testsuite/ld-ctf/cross-tu-into-cycle.d: Likewise.
	* testsuite/ld-ctf/cross-tu-noncyclic.d: Likewise.
	* testsuite/ld-ctf/cycle-1.d: Likewise.
	* testsuite/ld-ctf/cycle-2.A.d: Likewise.
	* testsuite/ld-ctf/cycle-2.B.d: Likewise.
	* testsuite/ld-ctf/cycle-2.C.d: Likewise.
	* testsuite/ld-ctf/data-func-conflicted.d: Likewise.
	* testsuite/ld-ctf/diag-cttname-null.d: Likewise.
	* testsuite/ld-ctf/diag-cuname.d: Likewise.
	* testsuite/ld-ctf/diag-parlabel.d: Likewise.
	* testsuite/ld-ctf/diag-wrong-magic-number-mixed.d: Likewise.
	* testsuite/ld-ctf/forward.d: Likewise.
	* testsuite/ld-ctf/function.d: Likewise.
	* testsuite/ld-ctf/slice.d: Likewise.
	* testsuite/ld-ctf/super-sub-cycles.d: Likewise.
	* testsuite/ld-ctf/enums.c: New test.
	* testsuite/ld-ctf/enums.d: New test.

libctf/ChangeLog
2021-01-05  Nick Alcock  <nick.alcock@oracle.com>

	* ctf-decl.c (ctf_decl_push): Exclude slices from the decl stack.
	* ctf-types.c (ctf_type_aname): No longer deal with slices here.
	* ctf-dump.c (ctf_dump_membstate_t) <cdm_toplevel_indent>: Constify.
	(CTF_FT_REFS): New.
	(CTF_FT_BITFIELD): Likewise.
	(CTF_FT_ID): Likewise.
	(ctf_dump_member): Do not do indentation here. Migrate the
	type-printing parts of this into...
	(ctf_dump_format_type): ... here, to be shared by all type printers.
	Get the errno value for non-representable types right.  Do not print
	bitfield info for non-bitfields.  Improve the format and indentation
	of other type output.  Shuffle spacing around to make all indentation
	either 'width of column' or 4 chars.
	(ctf_dump_label): Pass CTF_FT_REFS to ctf_dump_format_type.
	(ctf_dump_objts): Likewise.  Spacing shuffle.
	(ctf_dump_var): Likewise.
	(type_hex_digits): Migrate down in the file, to above its new user.
	(ctf_dump_type): Indent here instead.  Pass CTF_FT_REFS to
	ctf_dump_format_type. Don't trim off excess linefeeds now we no
	longer generate them.  Dump enumerated types.