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Simon Marchi 7c6f271296 gdb: make get_discrete_bounds check for non-constant range bounds
The next patch adds getters to the `dynamic_prop` structure.  These
getters validate that the accessed data matches the property kind (for
example, to access the `const_val` field, the property must be of kind
`PROP_CONST`).  It found one instance where we are accessing the
`const_val` data of a property that has the undefined kind.

This happens in function `get_discrete_bounds`, and is exposed by test
gdb.base/ptype.exp, amongst others.  Without this patch, we would get:

    $ ./gdb -q -nx --data-directory=data-directory testsuite/outputs/gdb.base/ptype/ptype -ex "ptype t_char_array"
    Reading symbols from testsuite/outputs/gdb.base/ptype/ptype...
    type = char [
    /home/smarchi/src/binutils-gdb/gdb/gdbtypes.h:526: internal-error: LONGEST dynamic_prop::const_val() const: Assertion `m_kind == PROP_CONST' failed.
    A problem internal to GDB has been detected,
    further debugging may prove unreliable.
    Quit this debugging session? (y or n)

The `get_discrete_bounds` function returns the bounds of a type (not
only range types).  For range types, it naturally uses the bound
properties that are intrinsic to the range type.  It accesses these
properties using TYPE_LOW_BOUND and TYPE_HIGH_BOUND, which assume the
properties are defined and have constant values.  This is sometimes not
the case, and the passed range type (as in the example above) has an
undefined high/upper bound.

Given its current interface (returning two LONGEST values for low and
high), `get_discrete_bounds` can't really work if the range type's
bounds are not both defined and both constant values.

This patch changes the function to return -1 (failure to get the bounds)
if any of the range type's bounds is not a constant value.  It is
sufficient to fix the issue and it seems to keep the callers happy, at
least according to the testsuite.

A bit in `get_array_bounds` could be removed, since
`get_discrete_bounds` no longer returns 1 if a bound is undefined.

gdb/ChangeLog:

	* gdbtypes.c (get_discrete_bounds): Return failure if
	the range type's bounds are not both defined and constant
	values.
	(get_array_bounds): Update comment.  Remove undefined bound check.

Change-Id: I047a3beee2c1e275f888cfc4778228339922bde9
2020-07-12 22:58:51 -04:00
bfd Automatic date update in version.in 2020-07-13 00:00:11 +00:00
binutils x86: Support GNU_PROPERTY_X86_FEATURE_2_TMM 2020-07-11 04:04:20 -07:00
config Add markers for binutils 2.35 branch 2020-07-04 10:16:22 +01:00
contrib contrib: Update dg-extract-results.* from gcc 2020-05-15 11:41:22 +01:00
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etc texi2pod.pl: import support for @t{...} from gcc 2020-01-15 12:58:09 -05:00
gas x86: Support GNU_PROPERTY_X86_FEATURE_2_TMM 2020-07-11 04:04:20 -07:00
gdb gdb: make get_discrete_bounds check for non-constant range bounds 2020-07-12 22:58:51 -04:00
gdbserver [gdbserver] Add missing include of gdbsupport/agent.h 2020-06-29 12:14:10 +02:00
gdbsupport Do not define basic_string_view::to_string 2020-06-30 07:53:03 -06:00
gnulib gdb: update gnulib import 2020-02-22 20:37:18 -05:00
gold Commit: Fix GOLD testsuite failures for 2.35 branch. 2020-07-08 11:08:05 +01:00
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sim sim/igen: Fix linker error with -fno-common 2020-07-03 21:03:47 +02:00
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compile
config-ml.in Update top level configure files by synchronizing them with gcc. 2018-01-10 15:29:21 +00:00
config.guess Update top level config files with copies from the official repository. 2020-01-18 13:43:19 +00:00
config.rpath
config.sub Update top level config files with copies from the official repository. 2020-01-18 13:43:19 +00:00
configure Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure. 2020-04-21 10:27:50 +01:00
configure.ac Since the pdp11-aout target does not support gdb, gdbserver or gprof these should be excluded in configure. 2020-04-21 10:27:50 +01:00
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MAINTAINERS Move gdbserver to top level 2020-02-07 08:42:25 -07:00
Makefile.def Change gdbserver to use existing gdbsupport 2020-03-12 13:32:16 -06:00
Makefile.in Change gdbserver to use existing gdbsupport 2020-03-12 13:32:16 -06:00
Makefile.tpl Revert "Sync top level files with versions from gcc." 2019-05-30 11:17:19 +01:00
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		   README for GNU development tools

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