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

Alan Hayward
2018-01-24T09:28:12Z

This patch commonises tdesc_feature and makes use of it in gdbserver tdesc.

Updated tdesc_create_feature so that it now creates a vector of features.

I am now able to commonise tdesc_create_reg (wanted to do this in the
previous patch).

I also had to commonise tdesc_type. This is ok, because I will need them
in a later patch.

Alan.

2018-01-24 Alan Hayward <alan.hayward@arm.com>

gdb/
* arch/tdesc.c (tdesc_feature::accept): Move to here.
(tdesc_feature::operator==): Likewise.
(tdesc_create_reg): Likewise.
* arch/tdesc.h (tdesc_type_kind): Likewise.
(struct tdesc_type): Likewise.
(struct tdesc_feature): Likewise.
* regformats/regdat.sh: Create a feature.
* target-descriptions.c (tdesc_type_kind): Move from here.
(tdesc_type): Likewise.
(tdesc_type_up): Likewise.
(tdesc_feature): Likewise.
(tdesc_create_reg): Likewise.

gdbserver/
* tdesc.c (~target_desc): Remove implictly deleted items.
(init_target_desc): Iterate all features.
(tdesc_get_features_xml): Use vector.
(tdesc_create_feature): Create feature.
* tdesc.h (tdesc_feature) Remove
(target_desc): Add features.

diff --git a/gdb/arch/tdesc.h b/gdb/arch/tdesc.h
index e957822b348182b8cae9809cd21f72974ffe05c5..480475fff873a19710befdf39e2bf3053be3efb3 100644
--- a/gdb/arch/tdesc.h
+++ b/gdb/arch/tdesc.h
@@ -31,6 +31,7 @@ struct tdesc_type_vector;
struct tdesc_type_with_fields;
struct tdesc_reg;
struct target_desc;
+struct type;

/* The interface to visit different elements of target description. */

@@ -125,6 +126,104 @@ struct tdesc_reg : tdesc_element

typedef std::unique_ptr<tdesc_reg> tdesc_reg_up;

+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;
+
+/* 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;
+
+ bool operator== (const tdesc_feature &other) const;
+
+ bool operator!= (const tdesc_feature &other) const
+ {
+ return !(*this == other);
+ }
+};
+
+typedef std::unique_ptr<tdesc_feature> tdesc_feature_up;
+
/* Allocate a new target_desc. */
target_desc *allocate_target_description (void);

diff --git a/gdb/arch/tdesc.c b/gdb/arch/tdesc.c
index 3d84ad8d3fa2e017f4c6f7d137a3be2b58427370..603ccd79434e1dccd17e69ef193193e673835dd0 100644
--- a/gdb/arch/tdesc.c
+++ b/gdb/arch/tdesc.c
@@ -38,3 +38,61 @@ tdesc_reg::tdesc_reg (struct tdesc_feature *feature, const std::string &name_,
have easy access to the containing feature when we want it later. */
tdesc_type = tdesc_named_type (feature, type.c_str ());
}
+
+void tdesc_feature::accept (tdesc_element_visitor &v) const
+{
+ 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 tdesc_feature::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;
+}
+
+/* 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);
+}
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
{
/* 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. */