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binutils-gdb/gdb/c-varobj.c
Pedro Alves 492d29ea1c Split TRY_CATCH into TRY + CATCH 
This patch splits the TRY_CATCH macro into three, so that we go from
this:

~~~
  volatile gdb_exception ex;

  TRY_CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  if (ex.reason < 0)
    {
    }
~~~

to this:

~~~
  TRY
    {
    }
  CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  END_CATCH
~~~

Thus, we'll be getting rid of the local volatile exception object, and
declaring the caught exception in the catch block.

This allows reimplementing TRY/CATCH in terms of C++ exceptions when
building in C++ mode, while still allowing to build GDB in C mode
(using setjmp/longjmp), as a transition step.

TBC, after this patch, is it _not_ valid to have code between the TRY
and the CATCH blocks, like:

  TRY
    {
    }

  // some code here.

  CATCH (ex, RETURN_MASK_ERROR)
    {
    }
  END_CATCH

Just like it isn't valid to do that with C++'s native try/catch.

By switching to creating the exception object inside the CATCH block
scope, we can get rid of all the explicitly allocated volatile
exception objects all over the tree, and map the CATCH block more
directly to C++'s catch blocks.

The majority of the TRY_CATCH -> TRY+CATCH+END_CATCH conversion was
done with a script, rerun from scratch at every rebase, no manual
editing involved.  After the mechanical conversion, a few places
needed manual intervention, to fix preexisting cases where we were
using the exception object outside of the TRY_CATCH block, and cases
where we were using "else" after a 'if (ex.reason) < 0)' [a CATCH
after this patch].  The result was folded into this patch so that GDB
still builds at each incremental step.

END_CATCH is necessary for two reasons:

First, because we name the exception object in the CATCH block, which
requires creating a scope, which in turn must be closed somewhere.
Declaring the exception variable in the initializer field of a for
block, like:

  #define CATCH(EXCEPTION, mask) \
    for (struct gdb_exception EXCEPTION; \
         exceptions_state_mc_catch (&EXCEPTION, MASK); \
	 EXCEPTION = exception_none)

would avoid needing END_CATCH, but alas, in C mode, we build with C90,
which doesn't allow mixed declarations and code.

Second, because when TRY/CATCH are wired to real C++ try/catch, as
long as we need to handle cleanup chains, even if there's no CATCH
block that wants to catch the exception, we need for stop at every
frame in the unwind chain and run cleanups, then rethrow.  That will
be done in END_CATCH.

After we require C++, we'll still need TRY/CATCH/END_CATCH until
cleanups are completely phased out -- TRY/CATCH in C++ mode will
save/restore the current cleanup chain, like in C mode, and END_CATCH
catches otherwise uncaugh exceptions, runs cleanups and rethrows, so
that C++ cleanups and exceptions can coexist.

IMO, this still makes the TRY/CATCH code look a bit more like a
newcomer would expect, so IMO worth it even if we weren't considering
C++.

gdb/ChangeLog.
2015-03-07  Pedro Alves  <palves@redhat.com>

	* common/common-exceptions.c (struct catcher) <exception>: No
	longer a pointer to volatile exception.  Now an exception value.
	<mask>: Delete field.
	(exceptions_state_mc_init): Remove all parameters.  Adjust.
	(exceptions_state_mc): No longer pop the catcher here.
	(exceptions_state_mc_catch): New function.
	(throw_exception): Adjust.
	* common/common-exceptions.h (exceptions_state_mc_init): Remove
	all parameters.
	(exceptions_state_mc_catch): Declare.
	(TRY_CATCH): Rename to ...
	(TRY): ... this.  Remove EXCEPTION and MASK parameters.
	(CATCH, END_CATCH): New.
	All callers adjusted.

gdb/gdbserver/ChangeLog:
2015-03-07  Pedro Alves  <palves@redhat.com>

	Adjust all callers of TRY_CATCH to use TRY/CATCH/END_CATCH
	instead.
2015-03-07 15:14:14 +00:00

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/* varobj support for C and C++.
Copyright (C) 1999-2015 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "value.h"
#include "varobj.h"
#include "gdbthread.h"
#include "valprint.h"
static void cplus_class_num_children (struct type *type, int children[3]);
/* The names of varobjs representing anonymous structs or unions. */
#define ANONYMOUS_STRUCT_NAME _("<anonymous struct>")
#define ANONYMOUS_UNION_NAME _("<anonymous union>")
/* Does CHILD represent a child with no name? This happens when
the child is an anonmous struct or union and it has no field name
in its parent variable.
This has already been determined by *_describe_child. The easiest
thing to do is to compare the child's name with ANONYMOUS_*_NAME. */
int
varobj_is_anonymous_child (const struct varobj *child)
{
return (strcmp (child->name, ANONYMOUS_STRUCT_NAME) == 0
|| strcmp (child->name, ANONYMOUS_UNION_NAME) == 0);
}
/* Given the value and the type of a variable object,
adjust the value and type to those necessary
for getting children of the variable object.
This includes dereferencing top-level references
to all types and dereferencing pointers to
structures.
If LOOKUP_ACTUAL_TYPE is set the enclosing type of the
value will be fetched and if it differs from static type
the value will be casted to it.
Both TYPE and *TYPE should be non-null. VALUE
can be null if we want to only translate type.
*VALUE can be null as well -- if the parent
value is not known.
If WAS_PTR is not NULL, set *WAS_PTR to 0 or 1
depending on whether pointer was dereferenced
in this function. */
static void
adjust_value_for_child_access (struct value **value,
struct type **type,
int *was_ptr,
int lookup_actual_type)
{
gdb_assert (type && *type);
if (was_ptr)
*was_ptr = 0;
*type = check_typedef (*type);
/* The type of value stored in varobj, that is passed
to us, is already supposed to be
reference-stripped. */
gdb_assert (TYPE_CODE (*type) != TYPE_CODE_REF);
/* Pointers to structures are treated just like
structures when accessing children. Don't
dererences pointers to other types. */
if (TYPE_CODE (*type) == TYPE_CODE_PTR)
{
struct type *target_type = get_target_type (*type);
if (TYPE_CODE (target_type) == TYPE_CODE_STRUCT
|| TYPE_CODE (target_type) == TYPE_CODE_UNION)
{
if (value && *value)
{
TRY
{
*value = value_ind (*value);
}
CATCH (except, RETURN_MASK_ERROR)
{
*value = NULL;
}
END_CATCH
}
*type = target_type;
if (was_ptr)
*was_ptr = 1;
}
}
/* The 'get_target_type' function calls check_typedef on
result, so we can immediately check type code. No
need to call check_typedef here. */
/* Access a real type of the value (if necessary and possible). */
if (value && *value && lookup_actual_type)
{
struct type *enclosing_type;
int real_type_found = 0;
enclosing_type = value_actual_type (*value, 1, &real_type_found);
if (real_type_found)
{
*type = enclosing_type;
*value = value_cast (enclosing_type, *value);
}
}
}
/* Is VAR a path expression parent, i.e., can it be used to construct
a valid path expression? */
static int
c_is_path_expr_parent (const struct varobj *var)
{
struct type *type;
/* "Fake" children are not path_expr parents. */
if (CPLUS_FAKE_CHILD (var))
return 0;
type = varobj_get_gdb_type (var);
/* Anonymous unions and structs are also not path_expr parents. */
if ((TYPE_CODE (type) == TYPE_CODE_STRUCT
|| TYPE_CODE (type) == TYPE_CODE_UNION)
&& TYPE_NAME (type) == NULL
&& TYPE_TAG_NAME (type) == NULL)
{
const struct varobj *parent = var->parent;
while (parent != NULL && CPLUS_FAKE_CHILD (parent))
parent = parent->parent;
if (parent != NULL)
{
struct type *parent_type;
int was_ptr;
parent_type = varobj_get_value_type (parent);
adjust_value_for_child_access (NULL, &parent_type, &was_ptr, 0);
if (TYPE_CODE (parent_type) == TYPE_CODE_STRUCT
|| TYPE_CODE (parent_type) == TYPE_CODE_UNION)
{
const char *field_name;
gdb_assert (var->index < TYPE_NFIELDS (parent_type));
field_name = TYPE_FIELD_NAME (parent_type, var->index);
return !(field_name == NULL || *field_name == '\0');
}
}
return 0;
}
return 1;
}
/* C */
static int
c_number_of_children (const struct varobj *var)
{
struct type *type = varobj_get_value_type (var);
int children = 0;
struct type *target;
adjust_value_for_child_access (NULL, &type, NULL, 0);
target = get_target_type (type);
switch (TYPE_CODE (type))
{
case TYPE_CODE_ARRAY:
if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (target) > 0
&& !TYPE_ARRAY_UPPER_BOUND_IS_UNDEFINED (type))
children = TYPE_LENGTH (type) / TYPE_LENGTH (target);
else
/* If we don't know how many elements there are, don't display
any. */
children = 0;
break;
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
children = TYPE_NFIELDS (type);
break;
case TYPE_CODE_PTR:
/* The type here is a pointer to non-struct. Typically, pointers
have one child, except for function ptrs, which have no children,
and except for void*, as we don't know what to show.
We can show char* so we allow it to be dereferenced. If you decide
to test for it, please mind that a little magic is necessary to
properly identify it: char* has TYPE_CODE == TYPE_CODE_INT and
TYPE_NAME == "char". */
if (TYPE_CODE (target) == TYPE_CODE_FUNC
|| TYPE_CODE (target) == TYPE_CODE_VOID)
children = 0;
else
children = 1;
break;
default:
/* Other types have no children. */
break;
}
return children;
}
static char *
c_name_of_variable (const struct varobj *parent)
{
return xstrdup (parent->name);
}
/* Return the value of element TYPE_INDEX of a structure
value VALUE. VALUE's type should be a structure,
or union, or a typedef to struct/union.
Returns NULL if getting the value fails. Never throws. */
static struct value *
value_struct_element_index (struct value *value, int type_index)
{
struct value *result = NULL;
struct type *type = value_type (value);
type = check_typedef (type);
gdb_assert (TYPE_CODE (type) == TYPE_CODE_STRUCT
|| TYPE_CODE (type) == TYPE_CODE_UNION);
TRY
{
if (field_is_static (&TYPE_FIELD (type, type_index)))
result = value_static_field (type, type_index);
else
result = value_primitive_field (value, 0, type_index, type);
}
CATCH (e, RETURN_MASK_ERROR)
{
return NULL;
}
END_CATCH
return result;
}
/* Obtain the information about child INDEX of the variable
object PARENT.
If CNAME is not null, sets *CNAME to the name of the child relative
to the parent.
If CVALUE is not null, sets *CVALUE to the value of the child.
If CTYPE is not null, sets *CTYPE to the type of the child.
If any of CNAME, CVALUE, or CTYPE is not null, but the corresponding
information cannot be determined, set *CNAME, *CVALUE, or *CTYPE
to NULL. */
static void
c_describe_child (const struct varobj *parent, int index,
char **cname, struct value **cvalue, struct type **ctype,
char **cfull_expression)
{
struct value *value = parent->value;
struct type *type = varobj_get_value_type (parent);
char *parent_expression = NULL;
int was_ptr;
if (cname)
*cname = NULL;
if (cvalue)
*cvalue = NULL;
if (ctype)
*ctype = NULL;
if (cfull_expression)
{
*cfull_expression = NULL;
parent_expression
= varobj_get_path_expr (varobj_get_path_expr_parent (parent));
}
adjust_value_for_child_access (&value, &type, &was_ptr, 0);
switch (TYPE_CODE (type))
{
case TYPE_CODE_ARRAY:
if (cname)
*cname
= xstrdup (int_string (index
+ TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)),
10, 1, 0, 0));
if (cvalue && value)
{
int real_index = index + TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type));
TRY
{
*cvalue = value_subscript (value, real_index);
}
CATCH (except, RETURN_MASK_ERROR)
{
}
END_CATCH
}
if (ctype)
*ctype = get_target_type (type);
if (cfull_expression)
*cfull_expression =
xstrprintf ("(%s)[%s]", parent_expression,
int_string (index
+ TYPE_LOW_BOUND (TYPE_INDEX_TYPE (type)),
10, 1, 0, 0));
break;
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
{
const char *field_name;
/* If the type is anonymous and the field has no name,
set an appropriate name. */
field_name = TYPE_FIELD_NAME (type, index);
if (field_name == NULL || *field_name == '\0')
{
if (cname)
{
if (TYPE_CODE (TYPE_FIELD_TYPE (type, index))
== TYPE_CODE_STRUCT)
*cname = xstrdup (ANONYMOUS_STRUCT_NAME);
else
*cname = xstrdup (ANONYMOUS_UNION_NAME);
}
if (cfull_expression)
*cfull_expression = xstrdup ("");
}
else
{
if (cname)
*cname = xstrdup (field_name);
if (cfull_expression)
{
char *join = was_ptr ? "->" : ".";
*cfull_expression = xstrprintf ("(%s)%s%s", parent_expression,
join, field_name);
}
}
if (cvalue && value)
{
/* For C, varobj index is the same as type index. */
*cvalue = value_struct_element_index (value, index);
}
if (ctype)
*ctype = TYPE_FIELD_TYPE (type, index);
}
break;
case TYPE_CODE_PTR:
if (cname)
*cname = xstrprintf ("*%s", parent->name);
if (cvalue && value)
{
TRY
{
*cvalue = value_ind (value);
}
CATCH (except, RETURN_MASK_ERROR)
{
*cvalue = NULL;
}
END_CATCH
}
/* Don't use get_target_type because it calls
check_typedef and here, we want to show the true
declared type of the variable. */
if (ctype)
*ctype = TYPE_TARGET_TYPE (type);
if (cfull_expression)
*cfull_expression = xstrprintf ("*(%s)", parent_expression);
break;
default:
/* This should not happen. */
if (cname)
*cname = xstrdup ("???");
if (cfull_expression)
*cfull_expression = xstrdup ("???");
/* Don't set value and type, we don't know then. */
}
}
static char *
c_name_of_child (const struct varobj *parent, int index)
{
char *name;
c_describe_child (parent, index, &name, NULL, NULL, NULL);
return name;
}
static char *
c_path_expr_of_child (const struct varobj *child)
{
char *path_expr;
c_describe_child (child->parent, child->index, NULL, NULL, NULL,
&path_expr);
return path_expr;
}
static struct value *
c_value_of_child (const struct varobj *parent, int index)
{
struct value *value = NULL;
c_describe_child (parent, index, NULL, &value, NULL, NULL);
return value;
}
static struct type *
c_type_of_child (const struct varobj *parent, int index)
{
struct type *type = NULL;
c_describe_child (parent, index, NULL, NULL, &type, NULL);
return type;
}
/* This returns the type of the variable. It also skips past typedefs
to return the real type of the variable. */
static struct type *
get_type (const struct varobj *var)
{
struct type *type;
type = var->type;
if (type != NULL)
type = check_typedef (type);
return type;
}
static char *
c_value_of_variable (const struct varobj *var,
enum varobj_display_formats format)
{
/* BOGUS: if val_print sees a struct/class, or a reference to one,
it will print out its children instead of "{...}". So we need to
catch that case explicitly. */
struct type *type = get_type (var);
/* Strip top-level references. */
while (TYPE_CODE (type) == TYPE_CODE_REF)
type = check_typedef (TYPE_TARGET_TYPE (type));
switch (TYPE_CODE (type))
{
case TYPE_CODE_STRUCT:
case TYPE_CODE_UNION:
return xstrdup ("{...}");
/* break; */
case TYPE_CODE_ARRAY:
{
char *number;
number = xstrprintf ("[%d]", var->num_children);
return (number);
}
/* break; */
default:
{
if (var->value == NULL)
{
/* This can happen if we attempt to get the value of a struct
member when the parent is an invalid pointer. This is an
error condition, so we should tell the caller. */
return NULL;
}
else
{
if (var->not_fetched && value_lazy (var->value))
/* Frozen variable and no value yet. We don't
implicitly fetch the value. MI response will
use empty string for the value, which is OK. */
return NULL;
gdb_assert (varobj_value_is_changeable_p (var));
gdb_assert (!value_lazy (var->value));
/* If the specified format is the current one,
we can reuse print_value. */
if (format == var->format)
return xstrdup (var->print_value);
else
return varobj_value_get_print_value (var->value, format, var);
}
}
}
}
/* varobj operations for c. */
const struct lang_varobj_ops c_varobj_ops =
{
c_number_of_children,
c_name_of_variable,
c_name_of_child,
c_path_expr_of_child,
c_value_of_child,
c_type_of_child,
c_value_of_variable,
varobj_default_value_is_changeable_p,
NULL, /* value_has_mutated */
c_is_path_expr_parent /* is_path_expr_parent */
};
/* A little convenience enum for dealing with C++/Java. */
enum vsections
{
v_public = 0, v_private, v_protected
};
/* C++ */
static int
cplus_number_of_children (const struct varobj *var)
{
struct value *value = NULL;
struct type *type;
int children, dont_know;
int lookup_actual_type = 0;
struct value_print_options opts;
dont_know = 1;
children = 0;
get_user_print_options (&opts);
if (!CPLUS_FAKE_CHILD (var))
{
type = varobj_get_value_type (var);
/* It is necessary to access a real type (via RTTI). */
if (opts.objectprint)
{
value = var->value;
lookup_actual_type = (TYPE_CODE (var->type) == TYPE_CODE_REF
|| TYPE_CODE (var->type) == TYPE_CODE_PTR);
}
adjust_value_for_child_access (&value, &type, NULL, lookup_actual_type);
if (((TYPE_CODE (type)) == TYPE_CODE_STRUCT)
|| ((TYPE_CODE (type)) == TYPE_CODE_UNION))
{
int kids[3];
cplus_class_num_children (type, kids);
if (kids[v_public] != 0)
children++;
if (kids[v_private] != 0)
children++;
if (kids[v_protected] != 0)
children++;
/* Add any baseclasses. */
children += TYPE_N_BASECLASSES (type);
dont_know = 0;
/* FIXME: save children in var. */
}
}
else
{
int kids[3];
type = varobj_get_value_type (var->parent);
/* It is necessary to access a real type (via RTTI). */
if (opts.objectprint)
{
const struct varobj *parent = var->parent;
value = parent->value;
lookup_actual_type = (TYPE_CODE (parent->type) == TYPE_CODE_REF
|| TYPE_CODE (parent->type) == TYPE_CODE_PTR);
}
adjust_value_for_child_access (&value, &type, NULL, lookup_actual_type);
cplus_class_num_children (type, kids);
if (strcmp (var->name, "public") == 0)
children = kids[v_public];
else if (strcmp (var->name, "private") == 0)
children = kids[v_private];
else
children = kids[v_protected];
dont_know = 0;
}
if (dont_know)
children = c_number_of_children (var);
return children;
}
/* Compute # of public, private, and protected variables in this class.
That means we need to descend into all baseclasses and find out
how many are there, too. */
static void
cplus_class_num_children (struct type *type, int children[3])
{
int i, vptr_fieldno;
struct type *basetype = NULL;
children[v_public] = 0;
children[v_private] = 0;
children[v_protected] = 0;
vptr_fieldno = get_vptr_fieldno (type, &basetype);
for (i = TYPE_N_BASECLASSES (type); i < TYPE_NFIELDS (type); i++)
{
/* If we have a virtual table pointer, omit it. Even if virtual
table pointers are not specifically marked in the debug info,
they should be artificial. */
if ((type == basetype && i == vptr_fieldno)
|| TYPE_FIELD_ARTIFICIAL (type, i))
continue;
if (TYPE_FIELD_PROTECTED (type, i))
children[v_protected]++;
else if (TYPE_FIELD_PRIVATE (type, i))
children[v_private]++;
else
children[v_public]++;
}
}
static char *
cplus_name_of_variable (const struct varobj *parent)
{
return c_name_of_variable (parent);
}
enum accessibility { private_field, protected_field, public_field };
/* Check if field INDEX of TYPE has the specified accessibility.
Return 0 if so and 1 otherwise. */
static int
match_accessibility (struct type *type, int index, enum accessibility acc)
{
if (acc == private_field && TYPE_FIELD_PRIVATE (type, index))
return 1;
else if (acc == protected_field && TYPE_FIELD_PROTECTED (type, index))
return 1;
else if (acc == public_field && !TYPE_FIELD_PRIVATE (type, index)
&& !TYPE_FIELD_PROTECTED (type, index))
return 1;
else
return 0;
}
static void
cplus_describe_child (const struct varobj *parent, int index,
char **cname, struct value **cvalue, struct type **ctype,
char **cfull_expression)
{
struct value *value;
struct type *type;
int was_ptr;
int lookup_actual_type = 0;
char *parent_expression = NULL;
const struct varobj *var;
struct value_print_options opts;
if (cname)
*cname = NULL;
if (cvalue)
*cvalue = NULL;
if (ctype)
*ctype = NULL;
if (cfull_expression)
*cfull_expression = NULL;
get_user_print_options (&opts);
var = (CPLUS_FAKE_CHILD (parent)) ? parent->parent : parent;
if (opts.objectprint)
lookup_actual_type = (TYPE_CODE (var->type) == TYPE_CODE_REF
|| TYPE_CODE (var->type) == TYPE_CODE_PTR);
value = var->value;
type = varobj_get_value_type (var);
if (cfull_expression)
parent_expression
= varobj_get_path_expr (varobj_get_path_expr_parent (var));
adjust_value_for_child_access (&value, &type, &was_ptr, lookup_actual_type);
if (TYPE_CODE (type) == TYPE_CODE_STRUCT
|| TYPE_CODE (type) == TYPE_CODE_UNION)
{
char *join = was_ptr ? "->" : ".";
if (CPLUS_FAKE_CHILD (parent))
{
/* The fields of the class type are ordered as they
appear in the class. We are given an index for a
particular access control type ("public","protected",
or "private"). We must skip over fields that don't
have the access control we are looking for to properly
find the indexed field. */
int type_index = TYPE_N_BASECLASSES (type);
enum accessibility acc = public_field;
int vptr_fieldno;
struct type *basetype = NULL;
const char *field_name;
vptr_fieldno = get_vptr_fieldno (type, &basetype);
if (strcmp (parent->name, "private") == 0)
acc = private_field;
else if (strcmp (parent->name, "protected") == 0)
acc = protected_field;
while (index >= 0)
{
if ((type == basetype && type_index == vptr_fieldno)
|| TYPE_FIELD_ARTIFICIAL (type, type_index))
; /* ignore vptr */
else if (match_accessibility (type, type_index, acc))
--index;
++type_index;
}
--type_index;
/* If the type is anonymous and the field has no name,
set an appopriate name. */
field_name = TYPE_FIELD_NAME (type, type_index);
if (field_name == NULL || *field_name == '\0')
{
if (cname)
{
if (TYPE_CODE (TYPE_FIELD_TYPE (type, type_index))
== TYPE_CODE_STRUCT)
*cname = xstrdup (ANONYMOUS_STRUCT_NAME);
else if (TYPE_CODE (TYPE_FIELD_TYPE (type, type_index))
== TYPE_CODE_UNION)
*cname = xstrdup (ANONYMOUS_UNION_NAME);
}
if (cfull_expression)
*cfull_expression = xstrdup ("");
}
else
{
if (cname)
*cname = xstrdup (TYPE_FIELD_NAME (type, type_index));
if (cfull_expression)
*cfull_expression
= xstrprintf ("((%s)%s%s)", parent_expression, join,
field_name);
}
if (cvalue && value)
*cvalue = value_struct_element_index (value, type_index);
if (ctype)
*ctype = TYPE_FIELD_TYPE (type, type_index);
}
else if (index < TYPE_N_BASECLASSES (type))
{
/* This is a baseclass. */
if (cname)
*cname = xstrdup (TYPE_FIELD_NAME (type, index));
if (cvalue && value)
*cvalue = value_cast (TYPE_FIELD_TYPE (type, index), value);
if (ctype)
{
*ctype = TYPE_FIELD_TYPE (type, index);
}
if (cfull_expression)
{
char *ptr = was_ptr ? "*" : "";
/* Cast the parent to the base' type. Note that in gdb,
expression like
(Base1)d
will create an lvalue, for all appearences, so we don't
need to use more fancy:
*(Base1*)(&d)
construct.
When we are in the scope of the base class or of one
of its children, the type field name will be interpreted
as a constructor, if it exists. Therefore, we must
indicate that the name is a class name by using the
'class' keyword. See PR mi/11912 */
*cfull_expression = xstrprintf ("(%s(class %s%s) %s)",
ptr,
TYPE_FIELD_NAME (type, index),
ptr,
parent_expression);
}
}
else
{
char *access = NULL;
int children[3];
cplus_class_num_children (type, children);
/* Everything beyond the baseclasses can
only be "public", "private", or "protected"
The special "fake" children are always output by varobj in
this order. So if INDEX == 2, it MUST be "protected". */
index -= TYPE_N_BASECLASSES (type);
switch (index)
{
case 0:
if (children[v_public] > 0)
access = "public";
else if (children[v_private] > 0)
access = "private";
else
access = "protected";
break;
case 1:
if (children[v_public] > 0)
{
if (children[v_private] > 0)
access = "private";
else
access = "protected";
}
else if (children[v_private] > 0)
access = "protected";
break;
case 2:
/* Must be protected. */
access = "protected";
break;
default:
/* error! */
break;
}
gdb_assert (access);
if (cname)
*cname = xstrdup (access);
/* Value and type and full expression are null here. */
}
}
else
{
c_describe_child (parent, index, cname, cvalue, ctype, cfull_expression);
}
}
static char *
cplus_name_of_child (const struct varobj *parent, int index)
{
char *name = NULL;
cplus_describe_child (parent, index, &name, NULL, NULL, NULL);
return name;
}
static char *
cplus_path_expr_of_child (const struct varobj *child)
{
char *path_expr;
cplus_describe_child (child->parent, child->index, NULL, NULL, NULL,
&path_expr);
return path_expr;
}
static struct value *
cplus_value_of_child (const struct varobj *parent, int index)
{
struct value *value = NULL;
cplus_describe_child (parent, index, NULL, &value, NULL, NULL);
return value;
}
static struct type *
cplus_type_of_child (const struct varobj *parent, int index)
{
struct type *type = NULL;
cplus_describe_child (parent, index, NULL, NULL, &type, NULL);
return type;
}
static char *
cplus_value_of_variable (const struct varobj *var,
enum varobj_display_formats format)
{
/* If we have one of our special types, don't print out
any value. */
if (CPLUS_FAKE_CHILD (var))
return xstrdup ("");
return c_value_of_variable (var, format);
}
/* varobj operations for c++. */
const struct lang_varobj_ops cplus_varobj_ops =
{
cplus_number_of_children,
cplus_name_of_variable,
cplus_name_of_child,
cplus_path_expr_of_child,
cplus_value_of_child,
cplus_type_of_child,
cplus_value_of_variable,
varobj_default_value_is_changeable_p,
NULL, /* value_has_mutated */
c_is_path_expr_parent /* is_path_expr_parent */
};
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