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old-cross-binutils/gdb/cp-valprint.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

848 lines
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/* Support for printing C++ values for GDB, the GNU debugger.
Copyright (C) 1986-2015 Free Software Foundation, Inc.
This file is part of GDB.
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 "gdb_obstack.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "command.h"
#include "gdbcmd.h"
#include "demangle.h"
#include "annotate.h"
#include "c-lang.h"
#include "target.h"
#include "cp-abi.h"
#include "valprint.h"
#include "cp-support.h"
#include "language.h"
#include "extension.h"
#include "typeprint.h"
/* Controls printing of vtbl's. */
static void
show_vtblprint (struct ui_file *file, int from_tty,
struct cmd_list_element *c, const char *value)
{
fprintf_filtered (file, _("\
Printing of C++ virtual function tables is %s.\n"),
value);
}
/* Controls looking up an object's derived type using what we find in
its vtables. */
static void
show_objectprint (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
{
fprintf_filtered (file, _("\
Printing of object's derived type based on vtable info is %s.\n"),
value);
}
static void
show_static_field_print (struct ui_file *file, int from_tty,
struct cmd_list_element *c,
const char *value)
{
fprintf_filtered (file,
_("Printing of C++ static members is %s.\n"),
value);
}
static struct obstack dont_print_vb_obstack;
static struct obstack dont_print_statmem_obstack;
static struct obstack dont_print_stat_array_obstack;
extern void _initialize_cp_valprint (void);
static void cp_print_static_field (struct type *, struct value *,
struct ui_file *, int,
const struct value_print_options *);
static void cp_print_value (struct type *, struct type *,
const gdb_byte *, int,
CORE_ADDR, struct ui_file *,
int, const struct value *,
const struct value_print_options *,
struct type **);
/* GCC versions after 2.4.5 use this. */
EXPORTED_CONST char vtbl_ptr_name[] = "__vtbl_ptr_type";
/* Return truth value for assertion that TYPE is of the type
"pointer to virtual function". */
int
cp_is_vtbl_ptr_type (struct type *type)
{
const char *type_name = type_name_no_tag (type);
return (type_name != NULL && !strcmp (type_name, vtbl_ptr_name));
}
/* Return truth value for the assertion that TYPE is of the type
"pointer to virtual function table". */
int
cp_is_vtbl_member (struct type *type)
{
/* With older versions of g++, the vtbl field pointed to an array of
structures. Nowadays it points directly to the structure. */
if (TYPE_CODE (type) == TYPE_CODE_PTR)
{
type = TYPE_TARGET_TYPE (type);
if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
{
type = TYPE_TARGET_TYPE (type);
if (TYPE_CODE (type) == TYPE_CODE_STRUCT /* if not using thunks */
|| TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
{
/* Virtual functions tables are full of pointers
to virtual functions. */
return cp_is_vtbl_ptr_type (type);
}
}
else if (TYPE_CODE (type) == TYPE_CODE_STRUCT) /* if not using thunks */
{
return cp_is_vtbl_ptr_type (type);
}
else if (TYPE_CODE (type) == TYPE_CODE_PTR) /* if using thunks */
{
/* The type name of the thunk pointer is NULL when using
dwarf2. We could test for a pointer to a function, but
there is no type info for the virtual table either, so it
wont help. */
return cp_is_vtbl_ptr_type (type);
}
}
return 0;
}
/* Mutually recursive subroutines of cp_print_value and c_val_print to
print out a structure's fields: cp_print_value_fields and
cp_print_value.
TYPE, VALADDR, ADDRESS, STREAM, RECURSE, and OPTIONS have the same
meanings as in cp_print_value and c_val_print.
2nd argument REAL_TYPE is used to carry over the type of the
derived class across the recursion to base classes.
DONT_PRINT is an array of baseclass types that we should not print,
or zero if called from top level. */
void
cp_print_value_fields (struct type *type, struct type *real_type,
const gdb_byte *valaddr, int offset,
CORE_ADDR address, struct ui_file *stream,
int recurse, const struct value *val,
const struct value_print_options *options,
struct type **dont_print_vb,
int dont_print_statmem)
{
int i, len, n_baseclasses;
int fields_seen = 0;
static int last_set_recurse = -1;
CHECK_TYPEDEF (type);
if (recurse == 0)
{
/* Any object can be left on obstacks only during an unexpected
error. */
if (obstack_object_size (&dont_print_statmem_obstack) > 0)
{
obstack_free (&dont_print_statmem_obstack, NULL);
obstack_begin (&dont_print_statmem_obstack,
32 * sizeof (CORE_ADDR));
}
if (obstack_object_size (&dont_print_stat_array_obstack) > 0)
{
obstack_free (&dont_print_stat_array_obstack, NULL);
obstack_begin (&dont_print_stat_array_obstack,
32 * sizeof (struct type *));
}
}
fprintf_filtered (stream, "{");
len = TYPE_NFIELDS (type);
n_baseclasses = TYPE_N_BASECLASSES (type);
/* First, print out baseclasses such that we don't print
duplicates of virtual baseclasses. */
if (n_baseclasses > 0)
cp_print_value (type, real_type, valaddr,
offset, address, stream,
recurse + 1, val, options,
dont_print_vb);
/* Second, print out data fields */
/* If there are no data fields, skip this part */
if (len == n_baseclasses || !len)
fprintf_filtered (stream, "<No data fields>");
else
{
size_t statmem_obstack_initial_size = 0;
size_t stat_array_obstack_initial_size = 0;
struct type *vptr_basetype = NULL;
int vptr_fieldno;
if (dont_print_statmem == 0)
{
statmem_obstack_initial_size =
obstack_object_size (&dont_print_statmem_obstack);
if (last_set_recurse != recurse)
{
stat_array_obstack_initial_size =
obstack_object_size (&dont_print_stat_array_obstack);
last_set_recurse = recurse;
}
}
vptr_fieldno = get_vptr_fieldno (type, &vptr_basetype);
for (i = n_baseclasses; i < len; i++)
{
/* If requested, skip printing of static fields. */
if (!options->static_field_print
&& field_is_static (&TYPE_FIELD (type, i)))
continue;
if (fields_seen)
fprintf_filtered (stream, ", ");
else if (n_baseclasses > 0)
{
if (options->prettyformat)
{
fprintf_filtered (stream, "\n");
print_spaces_filtered (2 + 2 * recurse, stream);
fputs_filtered ("members of ", stream);
fputs_filtered (type_name_no_tag (type), stream);
fputs_filtered (": ", stream);
}
}
fields_seen = 1;
if (options->prettyformat)
{
fprintf_filtered (stream, "\n");
print_spaces_filtered (2 + 2 * recurse, stream);
}
else
{
wrap_here (n_spaces (2 + 2 * recurse));
}
annotate_field_begin (TYPE_FIELD_TYPE (type, i));
if (field_is_static (&TYPE_FIELD (type, i)))
fputs_filtered ("static ", stream);
fprintf_symbol_filtered (stream,
TYPE_FIELD_NAME (type, i),
current_language->la_language,
DMGL_PARAMS | DMGL_ANSI);
annotate_field_name_end ();
/* Do not print leading '=' in case of anonymous
unions. */
if (strcmp (TYPE_FIELD_NAME (type, i), ""))
fputs_filtered (" = ", stream);
annotate_field_value ();
if (!field_is_static (&TYPE_FIELD (type, i))
&& TYPE_FIELD_PACKED (type, i))
{
struct value *v;
/* Bitfields require special handling, especially due to
byte order problems. */
if (TYPE_FIELD_IGNORE (type, i))
{
fputs_filtered ("<optimized out or zero length>", stream);
}
else if (value_bits_synthetic_pointer (val,
TYPE_FIELD_BITPOS (type,
i),
TYPE_FIELD_BITSIZE (type,
i)))
{
fputs_filtered (_("<synthetic pointer>"), stream);
}
else
{
struct value_print_options opts = *options;
opts.deref_ref = 0;
v = value_field_bitfield (type, i, valaddr, offset, val);
common_val_print (v, stream, recurse + 1, &opts,
current_language);
}
}
else
{
if (TYPE_FIELD_IGNORE (type, i))
{
fputs_filtered ("<optimized out or zero length>",
stream);
}
else if (field_is_static (&TYPE_FIELD (type, i)))
{
struct value *v = NULL;
TRY
{
v = value_static_field (type, i);
}
CATCH (ex, RETURN_MASK_ERROR)
{
fprintf_filtered (stream,
_("<error reading variable: %s>"),
ex.message);
}
END_CATCH
cp_print_static_field (TYPE_FIELD_TYPE (type, i),
v, stream, recurse + 1,
options);
}
else if (i == vptr_fieldno && type == vptr_basetype)
{
int i_offset = offset + TYPE_FIELD_BITPOS (type, i) / 8;
struct type *i_type = TYPE_FIELD_TYPE (type, i);
if (valprint_check_validity (stream, i_type, i_offset, val))
{
CORE_ADDR addr;
addr = extract_typed_address (valaddr + i_offset, i_type);
print_function_pointer_address (options,
get_type_arch (type),
addr, stream);
}
}
else
{
struct value_print_options opts = *options;
opts.deref_ref = 0;
val_print (TYPE_FIELD_TYPE (type, i),
valaddr,
offset + TYPE_FIELD_BITPOS (type, i) / 8,
address,
stream, recurse + 1, val, &opts,
current_language);
}
}
annotate_field_end ();
}
if (dont_print_statmem == 0)
{
size_t obstack_final_size =
obstack_object_size (&dont_print_statmem_obstack);
if (obstack_final_size > statmem_obstack_initial_size)
{
/* In effect, a pop of the printed-statics stack. */
void *free_to_ptr =
(char *) obstack_next_free (&dont_print_statmem_obstack) -
(obstack_final_size - statmem_obstack_initial_size);
obstack_free (&dont_print_statmem_obstack,
free_to_ptr);
}
if (last_set_recurse != recurse)
{
size_t obstack_final_size =
obstack_object_size (&dont_print_stat_array_obstack);
if (obstack_final_size > stat_array_obstack_initial_size)
{
void *free_to_ptr =
(char *) obstack_next_free (&dont_print_stat_array_obstack)
- (obstack_final_size
- stat_array_obstack_initial_size);
obstack_free (&dont_print_stat_array_obstack,
free_to_ptr);
}
last_set_recurse = -1;
}
}
if (options->prettyformat)
{
fprintf_filtered (stream, "\n");
print_spaces_filtered (2 * recurse, stream);
}
} /* if there are data fields */
fprintf_filtered (stream, "}");
}
/* Like cp_print_value_fields, but find the runtime type of the object
and pass it as the `real_type' argument to cp_print_value_fields.
This function is a hack to work around the fact that
common_val_print passes the embedded offset to val_print, but not
the enclosing type. */
void
cp_print_value_fields_rtti (struct type *type,
const gdb_byte *valaddr, int offset,
CORE_ADDR address,
struct ui_file *stream, int recurse,
const struct value *val,
const struct value_print_options *options,
struct type **dont_print_vb,
int dont_print_statmem)
{
struct type *real_type = NULL;
/* We require all bits to be valid in order to attempt a
conversion. */
if (!value_bits_any_optimized_out (val,
TARGET_CHAR_BIT * offset,
TARGET_CHAR_BIT * TYPE_LENGTH (type)))
{
struct value *value;
int full, top, using_enc;
/* Ugh, we have to convert back to a value here. */
value = value_from_contents_and_address (type, valaddr + offset,
address + offset);
type = value_type (value);
/* We don't actually care about most of the result here -- just
the type. We already have the correct offset, due to how
val_print was initially called. */
real_type = value_rtti_type (value, &full, &top, &using_enc);
}
if (!real_type)
real_type = type;
cp_print_value_fields (type, real_type, valaddr, offset,
address, stream, recurse, val, options,
dont_print_vb, dont_print_statmem);
}
/* Special val_print routine to avoid printing multiple copies of
virtual baseclasses. */
static void
cp_print_value (struct type *type, struct type *real_type,
const gdb_byte *valaddr, int offset,
CORE_ADDR address, struct ui_file *stream,
int recurse, const struct value *val,
const struct value_print_options *options,
struct type **dont_print_vb)
{
struct type **last_dont_print
= (struct type **) obstack_next_free (&dont_print_vb_obstack);
struct obstack tmp_obstack = dont_print_vb_obstack;
int i, n_baseclasses = TYPE_N_BASECLASSES (type);
int thisoffset;
struct type *thistype;
if (dont_print_vb == 0)
{
/* If we're at top level, carve out a completely fresh chunk of
the obstack and use that until this particular invocation
returns. */
/* Bump up the high-water mark. Now alpha is omega. */
obstack_finish (&dont_print_vb_obstack);
}
for (i = 0; i < n_baseclasses; i++)
{
int boffset = 0;
int skip = 0;
struct type *baseclass = check_typedef (TYPE_BASECLASS (type, i));
const char *basename = TYPE_NAME (baseclass);
const gdb_byte *base_valaddr = NULL;
const struct value *base_val = NULL;
if (BASETYPE_VIA_VIRTUAL (type, i))
{
struct type **first_dont_print
= (struct type **) obstack_base (&dont_print_vb_obstack);
int j = (struct type **)
obstack_next_free (&dont_print_vb_obstack) - first_dont_print;
while (--j >= 0)
if (baseclass == first_dont_print[j])
goto flush_it;
obstack_ptr_grow (&dont_print_vb_obstack, baseclass);
}
thisoffset = offset;
thistype = real_type;
TRY
{
boffset = baseclass_offset (type, i, valaddr, offset, address, val);
}
CATCH (ex, RETURN_MASK_ERROR)
{
if (ex.error == NOT_AVAILABLE_ERROR)
skip = -1;
else
skip = 1;
}
END_CATCH
if (skip == 0)
{
if (BASETYPE_VIA_VIRTUAL (type, i))
{
/* The virtual base class pointer might have been
clobbered by the user program. Make sure that it
still points to a valid memory location. */
if ((boffset + offset) < 0
|| (boffset + offset) >= TYPE_LENGTH (real_type))
{
gdb_byte *buf;
struct cleanup *back_to;
buf = xmalloc (TYPE_LENGTH (baseclass));
back_to = make_cleanup (xfree, buf);
if (target_read_memory (address + boffset, buf,
TYPE_LENGTH (baseclass)) != 0)
skip = 1;
base_val = value_from_contents_and_address (baseclass,
buf,
address + boffset);
baseclass = value_type (base_val);
thisoffset = 0;
boffset = 0;
thistype = baseclass;
base_valaddr = value_contents_for_printing_const (base_val);
do_cleanups (back_to);
}
else
{
base_valaddr = valaddr;
base_val = val;
}
}
else
{
base_valaddr = valaddr;
base_val = val;
}
}
/* Now do the printing. */
if (options->prettyformat)
{
fprintf_filtered (stream, "\n");
print_spaces_filtered (2 * recurse, stream);
}
fputs_filtered ("<", stream);
/* Not sure what the best notation is in the case where there is
no baseclass name. */
fputs_filtered (basename ? basename : "", stream);
fputs_filtered ("> = ", stream);
if (skip < 0)
val_print_unavailable (stream);
else if (skip > 0)
val_print_invalid_address (stream);
else
{
int result = 0;
/* Attempt to run an extension language pretty-printer on the
baseclass if possible. */
if (!options->raw)
result
= apply_ext_lang_val_pretty_printer (baseclass, base_valaddr,
thisoffset + boffset,
value_address (base_val),
stream, recurse,
base_val, options,
current_language);
if (!result)
cp_print_value_fields (baseclass, thistype, base_valaddr,
thisoffset + boffset,
value_address (base_val),
stream, recurse, base_val, options,
((struct type **)
obstack_base (&dont_print_vb_obstack)),
0);
}
fputs_filtered (", ", stream);
flush_it:
;
}
if (dont_print_vb == 0)
{
/* Free the space used to deal with the printing
of this type from top level. */
obstack_free (&dont_print_vb_obstack, last_dont_print);
/* Reset watermark so that we can continue protecting
ourselves from whatever we were protecting ourselves. */
dont_print_vb_obstack = tmp_obstack;
}
}
/* Print value of a static member. To avoid infinite recursion when
printing a class that contains a static instance of the class, we
keep the addresses of all printed static member classes in an
obstack and refuse to print them more than once.
VAL contains the value to print, TYPE, STREAM, RECURSE, and OPTIONS
have the same meanings as in c_val_print. */
static void
cp_print_static_field (struct type *type,
struct value *val,
struct ui_file *stream,
int recurse,
const struct value_print_options *options)
{
struct value_print_options opts;
if (value_entirely_optimized_out (val))
{
val_print_optimized_out (val, stream);
return;
}
if (TYPE_CODE (type) == TYPE_CODE_STRUCT)
{
CORE_ADDR *first_dont_print;
CORE_ADDR addr;
int i;
first_dont_print
= (CORE_ADDR *) obstack_base (&dont_print_statmem_obstack);
i = obstack_object_size (&dont_print_statmem_obstack)
/ sizeof (CORE_ADDR);
while (--i >= 0)
{
if (value_address (val) == first_dont_print[i])
{
fputs_filtered ("<same as static member of an already"
" seen type>",
stream);
return;
}
}
addr = value_address (val);
obstack_grow (&dont_print_statmem_obstack, (char *) &addr,
sizeof (CORE_ADDR));
CHECK_TYPEDEF (type);
cp_print_value_fields (type, value_enclosing_type (val),
value_contents_for_printing (val),
value_embedded_offset (val), addr,
stream, recurse, val,
options, NULL, 1);
return;
}
if (TYPE_CODE (type) == TYPE_CODE_ARRAY)
{
struct type **first_dont_print;
int i;
struct type *target_type = TYPE_TARGET_TYPE (type);
first_dont_print
= (struct type **) obstack_base (&dont_print_stat_array_obstack);
i = obstack_object_size (&dont_print_stat_array_obstack)
/ sizeof (struct type *);
while (--i >= 0)
{
if (target_type == first_dont_print[i])
{
fputs_filtered ("<same as static member of an already"
" seen type>",
stream);
return;
}
}
obstack_grow (&dont_print_stat_array_obstack,
(char *) &target_type,
sizeof (struct type *));
}
opts = *options;
opts.deref_ref = 0;
val_print (type, value_contents_for_printing (val),
value_embedded_offset (val),
value_address (val),
stream, recurse, val,
&opts, current_language);
}
/* Find the field in *SELF, or its non-virtual base classes, with
bit offset OFFSET. Set *SELF to the containing type and *FIELDNO
to the containing field number. If OFFSET is not exactly at the
start of some field, set *SELF to NULL. */
static void
cp_find_class_member (struct type **self_p, int *fieldno,
LONGEST offset)
{
struct type *self;
unsigned int i;
unsigned len;
*self_p = check_typedef (*self_p);
self = *self_p;
len = TYPE_NFIELDS (self);
for (i = TYPE_N_BASECLASSES (self); i < len; i++)
{
LONGEST bitpos = TYPE_FIELD_BITPOS (self, i);
QUIT;
if (offset == bitpos)
{
*fieldno = i;
return;
}
}
for (i = 0; i < TYPE_N_BASECLASSES (self); i++)
{
LONGEST bitpos = TYPE_FIELD_BITPOS (self, i);
LONGEST bitsize = 8 * TYPE_LENGTH (TYPE_FIELD_TYPE (self, i));
if (offset >= bitpos && offset < bitpos + bitsize)
{
*self_p = TYPE_FIELD_TYPE (self, i);
cp_find_class_member (self_p, fieldno, offset - bitpos);
return;
}
}
*self_p = NULL;
}
void
cp_print_class_member (const gdb_byte *valaddr, struct type *type,
struct ui_file *stream, char *prefix)
{
enum bfd_endian byte_order = gdbarch_byte_order (get_type_arch (type));
/* VAL is a byte offset into the structure type SELF_TYPE.
Find the name of the field for that offset and
print it. */
struct type *self_type = TYPE_SELF_TYPE (type);
LONGEST val;
int fieldno;
val = extract_signed_integer (valaddr,
TYPE_LENGTH (type),
byte_order);
/* Pointers to data members are usually byte offsets into an object.
Because a data member can have offset zero, and a NULL pointer to
member must be distinct from any valid non-NULL pointer to
member, either the value is biased or the NULL value has a
special representation; both are permitted by ISO C++. HP aCC
used a bias of 0x20000000; HP cfront used a bias of 1; g++ 3.x
and other compilers which use the Itanium ABI use -1 as the NULL
value. GDB only supports that last form; to add support for
another form, make this into a cp-abi hook. */
if (val == -1)
{
fprintf_filtered (stream, "NULL");
return;
}
cp_find_class_member (&self_type, &fieldno, val << 3);
if (self_type != NULL)
{
const char *name;
fputs_filtered (prefix, stream);
name = type_name_no_tag (self_type);
if (name)
fputs_filtered (name, stream);
else
c_type_print_base (self_type, stream, 0, 0, &type_print_raw_options);
fprintf_filtered (stream, "::");
fputs_filtered (TYPE_FIELD_NAME (self_type, fieldno), stream);
}
else
fprintf_filtered (stream, "%ld", (long) val);
}
void
_initialize_cp_valprint (void)
{
add_setshow_boolean_cmd ("static-members", class_support,
&user_print_options.static_field_print, _("\
Set printing of C++ static members."), _("\
Show printing of C++ static members."), NULL,
NULL,
show_static_field_print,
&setprintlist, &showprintlist);
add_setshow_boolean_cmd ("vtbl", class_support,
&user_print_options.vtblprint, _("\
Set printing of C++ virtual function tables."), _("\
Show printing of C++ virtual function tables."), NULL,
NULL,
show_vtblprint,
&setprintlist, &showprintlist);
add_setshow_boolean_cmd ("object", class_support,
&user_print_options.objectprint, _("\
Set printing of object's derived type based on vtable info."), _("\
Show printing of object's derived type based on vtable info."), NULL,
NULL,
show_objectprint,
&setprintlist, &showprintlist);
obstack_begin (&dont_print_stat_array_obstack,
32 * sizeof (struct type *));
obstack_begin (&dont_print_statmem_obstack,
32 * sizeof (CORE_ADDR));
obstack_begin (&dont_print_vb_obstack,
32 * sizeof (struct type *));
}
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