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gdb/fortran: Handle gdbarch_floatformat_for_type returning nullptr 

In this commit:

  commit 34d11c682f
  Date:   Fri May 3 15:23:55 2019 +0100

      gdb/fortran: Use floatformats_ia64_quad for fortran 16-byte floats

GDB was changed such that the Fortran's 16-byte float format was
obtained by calling gdbarch_floatformat_for_type instead of just using
gdbarch_long_double_format as it was before.

The problem with this default_floatformat_for_type can return NULL in
some cases, and the code introduced in 34d11c682f didn't consider
this.

This commit introduces several alternative strategies for finding a
suitable 16-byte floating point type.  First GDB calls
gdbarch_floatformat_for_type (this was what 34d11c682f added), if this
returns null GDB will use gdbarch_long_double_format if it is the
correct size (this was the format used before 34d11c682f).  Finally,
if neither of the above provides a suitable type then GDB will create
a new dummy type.

This final dummy type is unlikely to provide an correct debug
experience as far as examining the 16-byte floats, but it should
prevent GDB crashing.

gdb/ChangeLog:

	PR gdb/18644:
	* f-lang.c (build_fortran_types): Handle the case where
	gdbarch_floatformat_for_type returns a nullptr.
This commit is contained in:
Andrew Burgess 2019-05-21 22:14:05 +01:00
parent b474a2022d
commit dc42e902cc
2 changed files with 16 additions and 2 deletions
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6
gdb/ChangeLog
View File

@ -1,3 +1,9 @@
2019-05-21 Andrew Burgess <andrew.burgess@embecosm.com>
PR gdb/18644:
* f-lang.c (build_fortran_types): Handle the case where
gdbarch_floatformat_for_type returns a nullptr.
2019-05-21 Tom de Vries <tdevries@suse.de>
PR cli/24587

12
gdb/f-lang.c
View File

@ -728,8 +728,16 @@ build_fortran_types (struct gdbarch *gdbarch)
= arch_float_type (gdbarch, gdbarch_double_bit (gdbarch),
"real*8", gdbarch_double_format (gdbarch));
auto fmt = gdbarch_floatformat_for_type (gdbarch, "real(kind=16)", 128);
builtin_f_type->builtin_real_s16
= arch_float_type (gdbarch, 128, "real*16", fmt);
if (fmt != nullptr)
builtin_f_type->builtin_real_s16
= arch_float_type (gdbarch, 128, "real*16", fmt);
else if (gdbarch_long_double_bit (gdbarch) == 128)
builtin_f_type->builtin_real_s16
= arch_float_type (gdbarch, gdbarch_long_double_bit (gdbarch),
"real*16", gdbarch_long_double_format (gdbarch));
else
builtin_f_type->builtin_real_s16
= arch_type (gdbarch, TYPE_CODE_ERROR, 128, "real*16");
builtin_f_type->builtin_complex_s8
= arch_complex_type (gdbarch, "complex*8",