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Ada/DWARF: Assume the Ada compiler produces descriptive type attributes 

GCC was enhanced in 2011 to generate this attribute, so I think we can
now assume that it is available when using that compiler. Doing so
allows us to speed up what we call "parallel type" lookups when
processing certain types encoded using the GNAT encoding.

This patch changes need_gnat_info to always expect those attributes
to be generated when the language is Ada. This is an assumption
that on the surfcace looks like it might be a bit on the edge; but
in practice, it should be OK because this is only useful in the
context of handling GNAT-specific encodings. Other Ada compilers
would presumably produce debugging information using pure DWARF
constructs, so would not be impacted by this.

gdb/ChangeLog:

        * dwarf2read.c (need_gnat_info): Return nonzero if the cu's
        language is Ada.

Tested on x86_64-linux.
This commit is contained in:
Joel Brobecker 2018-01-21 23:23:34 -05:00
parent a9e408182d
commit de4cb04a20
2 changed files with 8 additions and 9 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2018-01-22 Joel Brobecker <brobecker@adacore.com>
* dwarf2read.c (need_gnat_info): Return nonzero if the cu's
language is Ada.
2018-01-22 Joel Brobecker <brobecker@adacore.com>
* linespec.c (create_sals_line_offset): Remove code that preserved

12
gdb/dwarf2read.c
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@ -21816,15 +21816,9 @@ die_type (struct die_info *die, struct dwarf2_cu *cu)
static int
need_gnat_info (struct dwarf2_cu *cu)
{
/* FIXME: brobecker/2010-10-12: As of now, only the AdaCore version
of GNAT produces this auxiliary information, without any indication
that it is produced. Part of enhancing the FSF version of GNAT
to produce that information will be to put in place an indicator
that we can use in order to determine whether the descriptive type
info is available or not. One suggestion that has been made is
to use a new attribute, attached to the CU die. For now, assume
that the descriptive type info is not available. */
return 0;
/* Assume that the Ada compiler was GNAT, which always produces
the auxiliary information. */
return (cu->language == language_ada);
}
/* Return the auxiliary type of the die in question using its