[PATCH v3 4/4] tdesc: handle arbitrary strings in tdesc_register_in_reggroup_p
Simon Marchi
simon.marchi@polymtl.ca
Thu Dec 21 03:29:00 GMT 2017
On 2017-12-19 09:22, Stafford Horne wrote:
> tdesc_register_in_reggroup_p in now able to handle arbitrary
> groups. This is useful when groups are created while the
> target descriptor file is received from the remote.
>
> This can be the case of a soft core target processor where
> registers/groups can change.
>
> gdb/ChangeLog:
>
> 2017-06-06 Franck Jullien <franck.jullien@gmail.com>
> Stafford Horne <shorne@gmail.com>
>
> * target-descriptions.c (tdesc_register_in_reggroup_p): Support
> arbitrary strings.
> * NEWS (Changes since GDB 8.0): Announce that GDB supports
> arbitrary reggroups.
>
> gdb/testsuite/ChangeLog:
>
> 2017-06-06 Stafford Horne <shorne@gmail.com>
>
> * gdb.xml/extra-regs.xml: Add example foo reggroup.
> * gdb.xml/tdesc-regs.exp: Add test to check for foo reggroup.
>
> gdb/doc/ChangeLog:
>
> 2017-06-06 Stafford Horne <shorne@gmail.com>
>
> * gdb.texinfo (Target Description Format): Explain that arbitrary
> strings are now allowed for register groups.
> ---
> gdb/NEWS | 7 ++++
> gdb/doc/gdb.texinfo | 9 +++--
> gdb/target-descriptions.c | 74
> ++++++++++++++++++------------------
> gdb/testsuite/gdb.xml/extra-regs.xml | 1 +
> gdb/testsuite/gdb.xml/tdesc-regs.exp | 3 ++
> 5 files changed, 53 insertions(+), 41 deletions(-)
>
> diff --git a/gdb/NEWS b/gdb/NEWS
> index 44f481d1f5..7d27262aee 100644
> --- a/gdb/NEWS
> +++ b/gdb/NEWS
> @@ -3,6 +3,13 @@
>
> *** Changes since GDB 8.0
>
> +* GDB now supports dynamically creating arbitrary register groups
> specified
> + in XML target descriptions. This allows for finer grain grouping of
> + registers on systems with a large amount of registers.
> +
> +* On Unix systems, GDBserver now does globbing expansion and variable
> + substitution in inferior command line arguments.
> +
> * The 'ptype' command now accepts a '/o' flag, which prints the
> offsets and sizes of fields in a struct, like the pahole(1) tool.
>
> diff --git a/gdb/doc/gdb.texinfo b/gdb/doc/gdb.texinfo
> index e169260e7e..a71faaa89c 100644
> --- a/gdb/doc/gdb.texinfo
> +++ b/gdb/doc/gdb.texinfo
> @@ -41761,10 +41761,11 @@ architecture's normal floating point format)
> of the correct size for
> @var{bitsize}. The default is @code{int}.
>
> @item group
> -The register group to which this register belongs. It must
> -be either @code{general}, @code{float}, or @code{vector}. If no
> -@var{group} is specified, @value{GDBN} will not display the register
> -in @code{info registers}.
> +The register group to which this register belongs. It can be one of
> the
> +standard register groups @code{general}, @code{float}, @code{vector}
> or an
> +arbitrary string. The string should be limited to alphanumeric
> characters
> +and internal hyphens. If no @var{group} is specified, @value{GDBN}
> will
> +not display the register in @code{info registers}.
>
> @end table
>
> diff --git a/gdb/target-descriptions.c b/gdb/target-descriptions.c
> index 88ac55f404..1435f3f4cf 100644
> --- a/gdb/target-descriptions.c
> +++ b/gdb/target-descriptions.c
> @@ -111,12 +111,11 @@ struct tdesc_reg : tdesc_element
> int save_restore;
>
> /* The name of the register group containing this register, or empty
> - if the group should be automatically determined from the
> - register's type. If this is "general", "float", or "vector", the
> - corresponding "info" command should display this register's
> - value. It can be an arbitrary string, but should be limited to
> - alphanumeric characters and internal hyphens. Currently other
> - strings are ignored (treated as empty). */
> + if the group should be automatically determined from the
> register's
> + type. This is traditionally "general", "float", "vector" but can
> + also be an arbitrary string. If defined the corresponding "info"
> + command should display this register's value. The string should
> be
> + limited to alphanumeric characters and internal hyphens. */
> std::string group;
>
> /* The size of the register, in bits. */
> @@ -1279,17 +1278,13 @@ tdesc_remote_register_number (struct gdbarch
> *gdbarch, int regno)
> }
>
> /* Check whether REGNUM is a member of REGGROUP. Registers from the
> - target description may be classified as general, float, or vector.
> - Unlike a gdbarch register_reggroup_p method, this function will
> - return -1 if it does not know; the caller should handle registers
> - with no specified group.
> -
> - Arbitrary strings (other than "general", "float", and "vector")
> - from the description are not used; they cause the register to be
> - displayed in "info all-registers" but excluded from "info
> - registers" et al. The names of containing features are also not
> - used. This might be extended to display registers in some more
> - useful groupings.
> + target description may be classified as general, float, vector or
> other
> + register groups registered with reggroup_add(). Unlike a gdbarch
> + register_reggroup_p method, this function will return -1 if it does
> not
> + know; the caller should handle registers with no specified group.
> +
> + The names of containing features are not used. This might be
> extended
> + to display registers in some more useful groupings.
>
> The save-restore flag is also implemented here. */
>
> @@ -1299,26 +1294,9 @@ tdesc_register_in_reggroup_p (struct gdbarch
> *gdbarch, int regno,
> {
> struct tdesc_reg *reg = tdesc_find_register (gdbarch, regno);
>
> - if (reg != NULL && !reg->group.empty ())
> - {
> - int general_p = 0, float_p = 0, vector_p = 0;
> -
> - if (reg->group == "general")
> - general_p = 1;
> - else if (reg->group == "float")
> - float_p = 1;
> - else if (reg->group == "vector")
> - vector_p = 1;
> -
> - if (reggroup == float_reggroup)
> - return float_p;
> -
> - if (reggroup == vector_reggroup)
> - return vector_p;
> -
> - if (reggroup == general_reggroup)
> - return general_p;
> - }
> + if (reg != NULL && !reg->group.empty ()
> + && (strcmp (reg->group.c_str (), reggroup_name (reggroup)) ==
> 0))
I suggest
reg->group == reggroup_name (reggroup)
> + return 1;
>
> if (reg != NULL
> && (reggroup == save_reggroup || reggroup == restore_reggroup))
> @@ -1421,6 +1399,28 @@ tdesc_use_registers (struct gdbarch *gdbarch,
> void **slot = htab_find_slot (reg_hash, reg.get (), INSERT);
>
> *slot = reg.get ();
> + /* Add reggroup if its new. */
> + if (!reg->group.empty ())
> + {
> + struct reggroup *group;
> + bool group_exists = false;
> +
> + for (group = reggroup_next (gdbarch, NULL);
> + group != NULL;
> + group = reggroup_next (gdbarch, group))
> + {
> + if (strcmp (reg->group.c_str (), reggroup_name (group)) == 0)
Here too.
> + {
> + group_exists = true;
> + break;
> + }
> + }
> +
> + if (!group_exists)
> + reggroup_add (gdbarch, reggroup_gdbarch_new (gdbarch,
> + reg->group.c_str (),
> + USER_REGGROUP));
> + }
Could you factor this out in a separate function? It would probably be
useful to have a general-purpose function
reggroup *reggroup_find (struct gdbarch *gdbarch, const char *name);
Which you could then use here
if (reggroup_find (...) == NULL)
{
// Create group
}
Thanks,
Simon
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