Re: [PATCH v2 3/8] Use tdesc_feature in gdbserver tdesc

Philipp Rudo
2018-01-25T13:12:04Z

On Wed, 24 Jan 2018 09:28:01 +0000
Alan Hayward <Alan.Hayward@arm.com> wrote:
[...]
> diff --git a/gdb/gdbserver/tdesc.h b/gdb/gdbserver/tdesc.h
> index cfc1a194def019ecf899e9184385be94de39d08c..8ae6cddc1896af99d86206d159fb952a0f666043 100644
> --- a/gdb/gdbserver/tdesc.h
> +++ b/gdb/gdbserver/tdesc.h
> @@ -24,16 +24,10 @@
> #include "regdef.h"
> #include <vector>
>
> -struct tdesc_feature
> -{
> - /* The registers associated with this feature. */
> - std::vector<tdesc_reg_up> registers;
> -};
> -
> /* A target description. Inherit from tdesc_feature so that target_desc
> can be used as tdesc_feature. */
>
> -struct target_desc : tdesc_feature
> +struct target_desc

With your change the comment above is no longer true.

Philipp

> {
> /* A vector of elements of register definitions that
> describe the inferior's register set. */
> @@ -42,6 +36,9 @@ struct target_desc : tdesc_feature
> /* The register cache size, in bytes. */
> int registers_size;
>
> + /* XML features in this target description. */
> + std::vector<tdesc_feature_up> features;
> +
> #ifndef IN_PROCESS_AGENT
> /* An array of register names. These are the "expedite" registers:
> registers whose values are sent along with stop replies. */
> @@ -56,9 +53,6 @@ struct target_desc : tdesc_feature
> fields features, arch, and osabi in tdesc_get_features_xml. */
> const char *xmltarget = NULL;
>
> - /* XML features in this target description. */
> - VEC (char_ptr) *features = NULL;
> -
> /* The value of <architecture> element in the XML, replying GDB. */
> const char *arch = NULL;
>
> diff --git a/gdb/gdbserver/tdesc.c b/gdb/gdbserver/tdesc.c
> index 5dec636baa6b899490e8c700eea21d363fb79fa3..bc94d83ae58b9e79d8b71d0ce21c073f11765dd4 100644
> --- a/gdb/gdbserver/tdesc.c
> +++ b/gdb/gdbserver/tdesc.c
> @@ -23,19 +23,11 @@
>
> target_desc::~target_desc ()
> {
> - int i;
> -
> for (reg *reg : reg_defs)
> xfree (reg);
>
> xfree ((char *) arch);
> xfree ((char *) osabi);
> -
> - char *f;
> -
> - for (i = 0; VEC_iterate (char_ptr, features, i, f); i++)
> - xfree (f);
> - VEC_free (char_ptr, features);
> }
>
> bool target_desc::operator== (const target_desc &other) const
> @@ -73,28 +65,29 @@ init_target_desc (struct target_desc *tdesc)
> int offset = 0;
>
> /* Go through all the features and populate reg_defs. */
> - for (const tdesc_reg_up &treg : tdesc->registers)
> - {
> - /* Fill in any blank spaces. */
> - while (tdesc->reg_defs.size () < treg->target_regnum)
> - {
> - struct reg *reg = XCNEW (struct reg);
> - reg->name = "";
> - reg->size = 0;
> - reg->offset = offset;
> - tdesc->reg_defs.push_back (reg);
> - }
> -
> - gdb_assert (treg->target_regnum == 0
> - || treg->target_regnum == tdesc->reg_defs.size ());
> -
> - struct reg *reg = XCNEW (struct reg);
> - reg->name = treg->name.c_str ();
> - reg->size = treg->bitsize;
> - reg->offset = offset;
> - tdesc->reg_defs.push_back (reg);
> - offset += reg->size;
> - }
> + for (const tdesc_feature_up &feature : tdesc->features)
> + for (const tdesc_reg_up &treg : feature->registers)
> + {
> + /* Fill in any blank spaces. */
> + while (tdesc->reg_defs.size () < treg->target_regnum)
> + {
> + struct reg *reg = XCNEW (struct reg);
> + reg->name = "";
> + reg->size = 0;
> + reg->offset = offset;
> + tdesc->reg_defs.push_back (reg);
> + }
> +
> + gdb_assert (treg->target_regnum == 0
> + || treg->target_regnum == tdesc->reg_defs.size ());
> +
> + struct reg *reg = XCNEW (struct reg);
> + reg->name = treg->name.c_str ();
> + reg->size = treg->bitsize;
> + reg->offset = offset;
> + tdesc->reg_defs.push_back (reg);
> + offset += reg->size;
> + }
>
> tdesc->registers_size = offset / 8;
>
> @@ -157,7 +150,7 @@ tdesc_get_features_xml (target_desc *tdesc)
> {
> /* Either .xmltarget or .features is not NULL. */
> gdb_assert (tdesc->xmltarget != NULL
> - || (tdesc->features != NULL
> + || (!tdesc->features.empty ()
> && tdesc->arch != NULL));
>
> if (tdesc->xmltarget == NULL)
> @@ -177,12 +170,10 @@ tdesc_get_features_xml (target_desc *tdesc)
> buffer += "</osabi>";
> }
>
> - char *xml;
> -
> - for (int i = 0; VEC_iterate (char_ptr, tdesc->features, i, xml); i++)
> + for (const tdesc_feature_up &feature : tdesc->features)
> {
> buffer += "<xi:include href=\"";
> - buffer += xml;
> + buffer += feature->name;
> buffer += "\"/>";
> }
>
> @@ -195,19 +186,15 @@ tdesc_get_features_xml (target_desc *tdesc)
> }
> #endif
>
> -struct tdesc_type
> -{};
> -
> /* See arch/tdesc.h. */
>
> struct tdesc_feature *
> tdesc_create_feature (struct target_desc *tdesc, const char *name,
> const char *xml)
> {
> -#ifndef IN_PROCESS_AGENT
> - VEC_safe_push (char_ptr, tdesc->features, xstrdup (xml));
> -#endif
> - return tdesc;
> + struct tdesc_feature *new_feature = new tdesc_feature (name);
> + tdesc->features.emplace_back (new_feature);
> + return new_feature;
> }
>
> /* See arch/tdesc.h. */
> @@ -252,21 +239,6 @@ tdesc_create_struct (struct tdesc_feature *feature, const char *id)
>
> /* See arch/tdesc.h. */
>
> -void
> -tdesc_create_reg (struct tdesc_feature *feature, const char *name,
> - int regnum, int save_restore, const char *group,
> - int bitsize, const char *type)
> -{
> - struct target_desc *tdesc = (struct target_desc *) feature;
> -
> - tdesc_reg *reg = new tdesc_reg (feature, name, regnum, save_restore,
> - group, bitsize, type);
> -
> - tdesc->registers.emplace_back (reg);
> -}
> -
> -/* See arch/tdesc.h. */
> -
> struct tdesc_type *
> tdesc_create_vector (struct tdesc_feature *feature, const char *name,
> struct tdesc_type *field_type, int count)
> diff --git a/gdb/regformats/regdat.sh b/gdb/regformats/regdat.sh
> index ce1627120d9439082709c82c5804724f39477eb1..8c6e191596350fb4e983f8736985d9832f41e2d3 100755
> --- a/gdb/regformats/regdat.sh
> +++ b/gdb/regformats/regdat.sh
> @@ -131,7 +131,7 @@ do
> echo "{"
> echo " static struct target_desc tdesc_${name}_s;"
> echo " struct target_desc *result = &tdesc_${name}_s;"
> -
> + echo " struct tdesc_feature *feature = tdesc_create_feature (result, \"${name}\");"
> continue
> elif test "${type}" = "xmltarget"; then
> xmltarget="${entry}"
> @@ -149,7 +149,7 @@ do
> echo "$0: $1 does not specify \`\`name''." 1>&2
> exit 1
> else
> - echo " tdesc_create_reg ((struct tdesc_feature *) result, \"${entry}\","
> + echo " tdesc_create_reg (feature, \"${entry}\","
> echo " 0, 0, NULL, ${type}, NULL);"
>
> offset=`expr ${offset} + ${type}`
> diff --git a/gdb/target-descriptions.c b/gdb/target-descriptions.c
> index 881ef78d2e3adde409e8585deb67c96e2f0594ed..6df29521eb2319919c7e20df14ca5aebc1d25321 100644
> --- a/gdb/target-descriptions.c
> +++ b/gdb/target-descriptions.c
> @@ -67,69 +67,6 @@ struct tdesc_type_field
> int start, end;
> };
>
> -enum tdesc_type_kind
> -{
> - /* Predefined types. */
> - TDESC_TYPE_BOOL,
> - TDESC_TYPE_INT8,
> - TDESC_TYPE_INT16,
> - TDESC_TYPE_INT32,
> - TDESC_TYPE_INT64,
> - TDESC_TYPE_INT128,
> - TDESC_TYPE_UINT8,
> - TDESC_TYPE_UINT16,
> - TDESC_TYPE_UINT32,
> - TDESC_TYPE_UINT64,
> - TDESC_TYPE_UINT128,
> - TDESC_TYPE_CODE_PTR,
> - TDESC_TYPE_DATA_PTR,
> - TDESC_TYPE_IEEE_SINGLE,
> - TDESC_TYPE_IEEE_DOUBLE,
> - TDESC_TYPE_ARM_FPA_EXT,
> - TDESC_TYPE_I387_EXT,
> -
> - /* Types defined by a target feature. */
> - TDESC_TYPE_VECTOR,
> - TDESC_TYPE_STRUCT,
> - TDESC_TYPE_UNION,
> - TDESC_TYPE_FLAGS,
> - TDESC_TYPE_ENUM
> -};
> -
> -struct tdesc_type : tdesc_element
> -{
> - tdesc_type (const std::string &name_, enum tdesc_type_kind kind_)
> - : name (name_), kind (kind_)
> - {}
> -
> - virtual ~tdesc_type () = default;
> -
> - DISABLE_COPY_AND_ASSIGN (tdesc_type);
> -
> - /* The name of this type. */
> - std::string name;
> -
> - /* Identify the kind of this type. */
> - enum tdesc_type_kind kind;
> -
> - bool operator== (const tdesc_type &other) const
> - {
> - return name == other.name && kind == other.kind;
> - }
> -
> - bool operator!= (const tdesc_type &other) const
> - {
> - return !(*this == other);
> - }
> -
> - /* Construct, if necessary, and return the GDB type implementing this
> - target type for architecture GDBARCH. */
> -
> - virtual type *make_gdb_type (struct gdbarch *gdbarch) const = 0;
> -};
> -
> -typedef std::unique_ptr<tdesc_type> tdesc_type_up;
> -
> struct tdesc_type_builtin : tdesc_type
> {
> tdesc_type_builtin (const std::string &name, enum tdesc_type_kind kind)
> @@ -408,82 +345,6 @@ struct tdesc_type_with_fields : tdesc_type
> int size;
> };
>
> -/* A feature from a target description. Each feature is a collection
> - of other elements, e.g. registers and types. */
> -
> -struct tdesc_feature : tdesc_element
> -{
> - tdesc_feature (const std::string &name_)
> - : name (name_)
> - {}
> -
> - virtual ~tdesc_feature () = default;
> -
> - DISABLE_COPY_AND_ASSIGN (tdesc_feature);
> -
> - /* The name of this feature. It may be recognized by the architecture
> - support code. */
> - std::string name;
> -
> - /* The registers associated with this feature. */
> - std::vector<tdesc_reg_up> registers;
> -
> - /* The types associated with this feature. */
> - std::vector<tdesc_type_up> types;
> -
> - void accept (tdesc_element_visitor &v) const override
> - {
> - v.visit_pre (this);
> -
> - for (const tdesc_type_up &type : types)
> - type->accept (v);
> -
> - for (const tdesc_reg_up &reg : registers)
> - reg->accept (v);
> -
> - v.visit_post (this);
> - }
> -
> - bool operator== (const tdesc_feature &other) const
> - {
> - if (name != other.name)
> - return false;
> -
> - if (registers.size () != other.registers.size ())
> - return false;
> -
> - for (int ix = 0; ix < registers.size (); ix++)
> - {
> - const tdesc_reg_up &reg1 = registers[ix];
> - const tdesc_reg_up &reg2 = other.registers[ix];
> -
> - if (reg1 != reg2 && *reg1 != *reg2)
> - return false;
> - }
> -
> - if (types.size () != other.types.size ())
> - return false;
> -
> - for (int ix = 0; ix < types.size (); ix++)
> - {
> - const tdesc_type_up &type1 = types[ix];
> - const tdesc_type_up &type2 = other.types[ix];
> -
> - if (type1 != type2 && *type1 != *type2)
> - return false;
> - }
> -
> - return true;
> - }
> -
> - bool operator!= (const tdesc_feature &other) const
> - {
> - return !(*this == other);
> - }
> -};
> -
> -typedef std::unique_ptr<tdesc_feature> tdesc_feature_up;
> -
> /* A target description. */
>
> struct target_desc : tdesc_element
> @@ -1338,20 +1199,6 @@ tdesc_use_registers (struct gdbarch *gdbarch,
> tdesc_remote_register_number);
> set_gdbarch_register_reggroup_p (gdbarch, tdesc_register_reggroup_p);
> }
> -
>
> -
> -/* See arch/tdesc.h. */
> -
> -void
> -tdesc_create_reg (struct tdesc_feature *feature, const char *name,
> - int regnum, int save_restore, const char *group,
> - int bitsize, const char *type)
> -{
> - tdesc_reg *reg = new tdesc_reg (feature, name, regnum, save_restore,
> - group, bitsize, type);
> -
> - feature->registers.emplace_back (reg);
> -}
>
> /* See arch/tdesc.h. */
>