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| Current File : //usr/src/contrib/gdb/gdb/ada-typeprint.c |
/* Support for printing Ada types for GDB, the GNU debugger.
Copyright 1986, 1988, 1989, 1991, 1997, 2003 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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include "defs.h"
#include "gdb_obstack.h"
#include "bfd.h" /* Binary File Description */
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "gdbcore.h"
#include "target.h"
#include "command.h"
#include "gdbcmd.h"
#include "language.h"
#include "demangle.h"
#include "c-lang.h"
#include "typeprint.h"
#include "ada-lang.h"
#include <ctype.h>
#include "gdb_string.h"
#include <errno.h>
static int print_record_field_types (struct type *, struct type *,
struct ui_file *, int, int);
static void print_array_type (struct type *, struct ui_file *, int, int);
static void print_choices (struct type *, int, struct ui_file *,
struct type *);
static void print_range (struct type *, struct ui_file *);
static void print_range_bound (struct type *, char *, int *,
struct ui_file *);
static void
print_dynamic_range_bound (struct type *, const char *, int,
const char *, struct ui_file *);
static void print_range_type_named (char *, struct ui_file *);
static char *name_buffer;
static int name_buffer_len;
/* The (demangled) Ada name of TYPE. This value persists until the
next call. */
static char *
demangled_type_name (struct type *type)
{
if (ada_type_name (type) == NULL)
return NULL;
else
{
char *raw_name = ada_type_name (type);
char *s, *q;
if (name_buffer == NULL || name_buffer_len <= strlen (raw_name))
{
name_buffer_len = 16 + 2 * strlen (raw_name);
name_buffer = xrealloc (name_buffer, name_buffer_len);
}
strcpy (name_buffer, raw_name);
s = (char *) strstr (name_buffer, "___");
if (s != NULL)
*s = '\0';
s = name_buffer + strlen (name_buffer) - 1;
while (s > name_buffer && (s[0] != '_' || s[-1] != '_'))
s -= 1;
if (s == name_buffer)
return name_buffer;
if (!islower (s[1]))
return NULL;
for (s = q = name_buffer; *s != '\0'; q += 1)
{
if (s[0] == '_' && s[1] == '_')
{
*q = '.';
s += 2;
}
else
{
*q = *s;
s += 1;
}
}
*q = '\0';
return name_buffer;
}
}
/* Print a description of a type in the format of a
typedef for the current language.
NEW is the new name for a type TYPE. */
void
ada_typedef_print (struct type *type, struct symbol *new,
struct ui_file *stream)
{
fprintf_filtered (stream, "type %.*s is ",
ada_name_prefix_len (SYMBOL_PRINT_NAME (new)),
SYMBOL_PRINT_NAME (new));
type_print (type, "", stream, 1);
}
/* Print range type TYPE on STREAM. */
static void
print_range (struct type *type, struct ui_file *stream)
{
struct type *target_type;
target_type = TYPE_TARGET_TYPE (type);
if (target_type == NULL)
target_type = type;
switch (TYPE_CODE (target_type))
{
case TYPE_CODE_RANGE:
case TYPE_CODE_INT:
case TYPE_CODE_BOOL:
case TYPE_CODE_CHAR:
case TYPE_CODE_ENUM:
break;
default:
target_type = builtin_type_ada_int;
break;
}
if (TYPE_NFIELDS (type) < 2)
{
/* A range needs at least 2 bounds to be printed. If there are less
than 2, just print the type name instead of the range itself.
This check handles cases such as characters, for example.
Note that if the name is not defined, then we don't print anything.
*/
fprintf_filtered (stream, "%.*s",
ada_name_prefix_len (TYPE_NAME (type)),
TYPE_NAME (type));
}
else
{
/* We extract the range type bounds respectively from the first element
and the last element of the type->fields array */
const LONGEST lower_bound = (LONGEST) TYPE_LOW_BOUND (type);
const LONGEST upper_bound =
(LONGEST) TYPE_FIELD_BITPOS (type, TYPE_NFIELDS (type) - 1);
ada_print_scalar (target_type, lower_bound, stream);
fprintf_filtered (stream, " .. ");
ada_print_scalar (target_type, upper_bound, stream);
}
}
/* Print the number or discriminant bound at BOUNDS+*N on STREAM, and
set *N past the bound and its delimiter, if any. */
static void
print_range_bound (struct type *type, char *bounds, int *n,
struct ui_file *stream)
{
LONGEST B;
if (ada_scan_number (bounds, *n, &B, n))
{
ada_print_scalar (type, B, stream);
if (bounds[*n] == '_')
*n += 2;
}
else
{
int bound_len;
char *bound = bounds + *n;
char *pend;
pend = strstr (bound, "__");
if (pend == NULL)
*n += bound_len = strlen (bound);
else
{
bound_len = pend - bound;
*n += bound_len + 2;
}
fprintf_filtered (stream, "%.*s", bound_len, bound);
}
}
/* Assuming NAME[0 .. NAME_LEN-1] is the name of a range type, print
the value (if found) of the bound indicated by SUFFIX ("___L" or
"___U") according to the ___XD conventions. */
static void
print_dynamic_range_bound (struct type *type, const char *name, int name_len,
const char *suffix, struct ui_file *stream)
{
static char *name_buf = NULL;
static size_t name_buf_len = 0;
LONGEST B;
int OK;
GROW_VECT (name_buf, name_buf_len, name_len + strlen (suffix) + 1);
strncpy (name_buf, name, name_len);
strcpy (name_buf + name_len, suffix);
B = get_int_var_value (name_buf, 0, &OK);
if (OK)
ada_print_scalar (type, B, stream);
else
fprintf_filtered (stream, "?");
}
/* Print the range type named NAME. */
static void
print_range_type_named (char *name, struct ui_file *stream)
{
struct type *raw_type = ada_find_any_type (name);
struct type *base_type;
LONGEST low, high;
char *subtype_info;
if (raw_type == NULL)
base_type = builtin_type_int;
else if (TYPE_CODE (raw_type) == TYPE_CODE_RANGE)
base_type = TYPE_TARGET_TYPE (raw_type);
else
base_type = raw_type;
subtype_info = strstr (name, "___XD");
if (subtype_info == NULL && raw_type == NULL)
fprintf_filtered (stream, "? .. ?");
else if (subtype_info == NULL)
print_range (raw_type, stream);
else
{
int prefix_len = subtype_info - name;
char *bounds_str;
int n;
subtype_info += 5;
bounds_str = strchr (subtype_info, '_');
n = 1;
if (*subtype_info == 'L')
{
print_range_bound (raw_type, bounds_str, &n, stream);
subtype_info += 1;
}
else
print_dynamic_range_bound (raw_type, name, prefix_len, "___L",
stream);
fprintf_filtered (stream, " .. ");
if (*subtype_info == 'U')
print_range_bound (raw_type, bounds_str, &n, stream);
else
print_dynamic_range_bound (raw_type, name, prefix_len, "___U",
stream);
}
}
/* Print enumerated type TYPE on STREAM. */
static void
print_enum_type (struct type *type, struct ui_file *stream)
{
int len = TYPE_NFIELDS (type);
int i, lastval;
fprintf_filtered (stream, "(");
wrap_here (" ");
lastval = 0;
for (i = 0; i < len; i++)
{
QUIT;
if (i)
fprintf_filtered (stream, ", ");
wrap_here (" ");
fputs_filtered (ada_enum_name (TYPE_FIELD_NAME (type, i)), stream);
if (lastval != TYPE_FIELD_BITPOS (type, i))
{
fprintf_filtered (stream, " => %d", TYPE_FIELD_BITPOS (type, i));
lastval = TYPE_FIELD_BITPOS (type, i);
}
lastval += 1;
}
fprintf_filtered (stream, ")");
}
/* Print representation of Ada fixed-point type TYPE on STREAM. */
static void
print_fixed_point_type (struct type *type, struct ui_file *stream)
{
DOUBLEST delta = ada_delta (type);
DOUBLEST small = ada_fixed_to_float (type, 1.0);
if (delta < 0.0)
fprintf_filtered (stream, "delta ??");
else
{
fprintf_filtered (stream, "delta %g", (double) delta);
if (delta != small)
fprintf_filtered (stream, " <'small = %g>", (double) small);
}
}
/* Print representation of special VAX floating-point type TYPE on STREAM. */
static void
print_vax_floating_point_type (struct type *type, struct ui_file *stream)
{
fprintf_filtered (stream, "<float format %c>",
ada_vax_float_type_suffix (type));
}
/* Print simple (constrained) array type TYPE on STREAM. LEVEL is the
recursion (indentation) level, in case the element type itself has
nested structure, and SHOW is the number of levels of internal
structure to show (see ada_print_type). */
static void
print_array_type (struct type *type, struct ui_file *stream, int show,
int level)
{
int bitsize;
int n_indices;
bitsize = 0;
fprintf_filtered (stream, "array (");
n_indices = -1;
if (show < 0)
fprintf_filtered (stream, "...");
else
{
if (ada_is_packed_array_type (type))
type = ada_coerce_to_simple_array_type (type);
if (ada_is_simple_array (type))
{
struct type *range_desc_type =
ada_find_parallel_type (type, "___XA");
struct type *arr_type;
bitsize = 0;
if (range_desc_type == NULL)
{
for (arr_type = type; TYPE_CODE (arr_type) == TYPE_CODE_ARRAY;
arr_type = TYPE_TARGET_TYPE (arr_type))
{
if (arr_type != type)
fprintf_filtered (stream, ", ");
print_range (TYPE_INDEX_TYPE (arr_type), stream);
if (TYPE_FIELD_BITSIZE (arr_type, 0) > 0)
bitsize = TYPE_FIELD_BITSIZE (arr_type, 0);
}
}
else
{
int k;
n_indices = TYPE_NFIELDS (range_desc_type);
for (k = 0, arr_type = type;
k < n_indices;
k += 1, arr_type = TYPE_TARGET_TYPE (arr_type))
{
if (k > 0)
fprintf_filtered (stream, ", ");
print_range_type_named (TYPE_FIELD_NAME
(range_desc_type, k), stream);
if (TYPE_FIELD_BITSIZE (arr_type, 0) > 0)
bitsize = TYPE_FIELD_BITSIZE (arr_type, 0);
}
}
}
else
{
int i, i0;
for (i = i0 = ada_array_arity (type); i > 0; i -= 1)
fprintf_filtered (stream, "%s<>", i == i0 ? "" : ", ");
}
}
fprintf_filtered (stream, ") of ");
wrap_here ("");
ada_print_type (ada_array_element_type (type, n_indices), "", stream,
show == 0 ? 0 : show - 1, level + 1);
if (bitsize > 0)
fprintf_filtered (stream, " <packed: %d-bit elements>", bitsize);
}
/* Print the choices encoded by field FIELD_NUM of variant-part TYPE on
STREAM, assuming the VAL_TYPE is the type of the values. */
static void
print_choices (struct type *type, int field_num, struct ui_file *stream,
struct type *val_type)
{
int have_output;
int p;
const char *name = TYPE_FIELD_NAME (type, field_num);
have_output = 0;
/* Skip over leading 'V': NOTE soon to be obsolete. */
if (name[0] == 'V')
{
if (!ada_scan_number (name, 1, NULL, &p))
goto Huh;
}
else
p = 0;
while (1)
{
switch (name[p])
{
default:
return;
case 'S':
case 'R':
case 'O':
if (have_output)
fprintf_filtered (stream, " | ");
have_output = 1;
break;
}
switch (name[p])
{
case 'S':
{
LONGEST W;
if (!ada_scan_number (name, p + 1, &W, &p))
goto Huh;
ada_print_scalar (val_type, W, stream);
break;
}
case 'R':
{
LONGEST L, U;
if (!ada_scan_number (name, p + 1, &L, &p)
|| name[p] != 'T' || !ada_scan_number (name, p + 1, &U, &p))
goto Huh;
ada_print_scalar (val_type, L, stream);
fprintf_filtered (stream, " .. ");
ada_print_scalar (val_type, U, stream);
break;
}
case 'O':
fprintf_filtered (stream, "others");
p += 1;
break;
}
}
Huh:
fprintf_filtered (stream, "??");
}
/* Assuming that field FIELD_NUM of TYPE is a VARIANTS field whose
discriminant is contained in OUTER_TYPE, print its variants on STREAM.
LEVEL is the recursion
(indentation) level, in case any of the fields themselves have
nested structure, and SHOW is the number of levels of internal structure
to show (see ada_print_type). For this purpose, fields nested in a
variant part are taken to be at the same level as the fields
immediately outside the variant part. */
static void
print_variant_clauses (struct type *type, int field_num,
struct type *outer_type, struct ui_file *stream,
int show, int level)
{
int i;
struct type *var_type;
struct type *discr_type;
var_type = TYPE_FIELD_TYPE (type, field_num);
discr_type = ada_variant_discrim_type (var_type, outer_type);
if (TYPE_CODE (var_type) == TYPE_CODE_PTR)
{
var_type = TYPE_TARGET_TYPE (var_type);
if (TYPE_FLAGS (var_type) & TYPE_FLAG_STUB)
{
var_type = ada_find_parallel_type (var_type, "___XVU");
if (var_type == NULL)
return;
}
}
for (i = 0; i < TYPE_NFIELDS (var_type); i += 1)
{
fprintf_filtered (stream, "\n%*swhen ", level + 4, "");
print_choices (var_type, i, stream, discr_type);
fprintf_filtered (stream, " =>");
if (print_record_field_types (TYPE_FIELD_TYPE (var_type, i),
outer_type, stream, show, level + 4) <= 0)
fprintf_filtered (stream, " null;");
}
}
/* Assuming that field FIELD_NUM of TYPE is a variant part whose
discriminants are contained in OUTER_TYPE, print a description of it
on STREAM. LEVEL is the recursion (indentation) level, in case any of
the fields themselves have nested structure, and SHOW is the number of
levels of internal structure to show (see ada_print_type). For this
purpose, fields nested in a variant part are taken to be at the same
level as the fields immediately outside the variant part. */
static void
print_variant_part (struct type *type, int field_num, struct type *outer_type,
struct ui_file *stream, int show, int level)
{
fprintf_filtered (stream, "\n%*scase %s is", level + 4, "",
ada_variant_discrim_name
(TYPE_FIELD_TYPE (type, field_num)));
print_variant_clauses (type, field_num, outer_type, stream, show,
level + 4);
fprintf_filtered (stream, "\n%*send case;", level + 4, "");
}
/* Print a description on STREAM of the fields in record type TYPE, whose
discriminants are in OUTER_TYPE. LEVEL is the recursion (indentation)
level, in case any of the fields themselves have nested structure,
and SHOW is the number of levels of internal structure to show
(see ada_print_type). Does not print parent type information of TYPE.
Returns 0 if no fields printed, -1 for an incomplete type, else > 0.
Prints each field beginning on a new line, but does not put a new line at
end. */
static int
print_record_field_types (struct type *type, struct type *outer_type,
struct ui_file *stream, int show, int level)
{
int len, i, flds;
flds = 0;
len = TYPE_NFIELDS (type);
if (len == 0 && (TYPE_FLAGS (type) & TYPE_FLAG_STUB) != 0)
return -1;
for (i = 0; i < len; i += 1)
{
QUIT;
if (ada_is_parent_field (type, i) || ada_is_ignored_field (type, i))
;
else if (ada_is_wrapper_field (type, i))
flds += print_record_field_types (TYPE_FIELD_TYPE (type, i), type,
stream, show, level);
else if (ada_is_variant_part (type, i))
{
print_variant_part (type, i, outer_type, stream, show, level);
flds = 1;
}
else
{
flds += 1;
fprintf_filtered (stream, "\n%*s", level + 4, "");
ada_print_type (TYPE_FIELD_TYPE (type, i),
TYPE_FIELD_NAME (type, i),
stream, show - 1, level + 4);
fprintf_filtered (stream, ";");
}
}
return flds;
}
/* Print record type TYPE on STREAM. LEVEL is the recursion (indentation)
level, in case the element type itself has nested structure, and SHOW is
the number of levels of internal structure to show (see ada_print_type). */
static void
print_record_type (struct type *type0, struct ui_file *stream, int show,
int level)
{
struct type *parent_type;
struct type *type;
type = type0;
if (TYPE_FLAGS (type) & TYPE_FLAG_STUB)
{
struct type *type1 = ada_find_parallel_type (type, "___XVE");
if (type1 != NULL)
type = type1;
}
parent_type = ada_parent_type (type);
if (ada_type_name (parent_type) != NULL)
fprintf_filtered (stream, "new %s with ",
demangled_type_name (parent_type));
else if (parent_type == NULL && ada_is_tagged_type (type))
fprintf_filtered (stream, "tagged ");
fprintf_filtered (stream, "record");
if (show < 0)
fprintf_filtered (stream, " ... end record");
else
{
int flds;
flds = 0;
if (parent_type != NULL && ada_type_name (parent_type) == NULL)
flds += print_record_field_types (parent_type, parent_type,
stream, show, level);
flds += print_record_field_types (type, type, stream, show, level);
if (flds > 0)
fprintf_filtered (stream, "\n%*send record", level, "");
else if (flds < 0)
fprintf_filtered (stream, " <incomplete type> end record");
else
fprintf_filtered (stream, " null; end record");
}
}
/* Print the unchecked union type TYPE in something resembling Ada
format on STREAM. LEVEL is the recursion (indentation) level
in case the element type itself has nested structure, and SHOW is the
number of levels of internal structure to show (see ada_print_type). */
static void
print_unchecked_union_type (struct type *type, struct ui_file *stream,
int show, int level)
{
fprintf_filtered (stream, "record (?) is");
if (show < 0)
fprintf_filtered (stream, " ... end record");
else if (TYPE_NFIELDS (type) == 0)
fprintf_filtered (stream, " null; end record");
else
{
int i;
fprintf_filtered (stream, "\n%*scase ? is", level + 4, "");
for (i = 0; i < TYPE_NFIELDS (type); i += 1)
{
fprintf_filtered (stream, "\n%*swhen ? =>\n%*s", level + 8, "",
level + 12, "");
ada_print_type (TYPE_FIELD_TYPE (type, i),
TYPE_FIELD_NAME (type, i),
stream, show - 1, level + 12);
fprintf_filtered (stream, ";");
}
fprintf_filtered (stream, "\n%*send case;\n%*send record",
level + 4, "", level, "");
}
}
/* Print function or procedure type TYPE on STREAM. Make it a header
for function or procedure NAME if NAME is not null. */
static void
print_func_type (struct type *type, struct ui_file *stream, char *name)
{
int i, len = TYPE_NFIELDS (type);
if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_VOID)
fprintf_filtered (stream, "procedure");
else
fprintf_filtered (stream, "function");
if (name != NULL && name[0] != '\0')
fprintf_filtered (stream, " %s", name);
if (len > 0)
{
fprintf_filtered (stream, " (");
for (i = 0; i < len; i += 1)
{
if (i > 0)
{
fputs_filtered ("; ", stream);
wrap_here (" ");
}
fprintf_filtered (stream, "a%d: ", i + 1);
ada_print_type (TYPE_FIELD_TYPE (type, i), "", stream, -1, 0);
}
fprintf_filtered (stream, ")");
}
if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_VOID)
{
fprintf_filtered (stream, " return ");
ada_print_type (TYPE_TARGET_TYPE (type), "", stream, 0, 0);
}
}
/* Print a description of a type TYPE0.
Output goes to STREAM (via stdio).
If VARSTRING is a non-empty string, print as an Ada variable/field
declaration.
SHOW+1 is the maximum number of levels of internal type structure
to show (this applies to record types, enumerated types, and
array types).
SHOW is the number of levels of internal type structure to show
when there is a type name for the SHOWth deepest level (0th is
outer level).
When SHOW<0, no inner structure is shown.
LEVEL indicates level of recursion (for nested definitions). */
void
ada_print_type (struct type *type0, char *varstring, struct ui_file *stream,
int show, int level)
{
enum type_code code;
int demangled_args;
struct type *type = ada_completed_type (ada_get_base_type (type0));
char *type_name = demangled_type_name (type);
int is_var_decl = (varstring != NULL && varstring[0] != '\0');
if (type == NULL)
{
if (is_var_decl)
fprintf_filtered (stream, "%.*s: ",
ada_name_prefix_len (varstring), varstring);
fprintf_filtered (stream, "<null type?>");
return;
}
if (show > 0)
CHECK_TYPEDEF (type);
if (is_var_decl && TYPE_CODE (type) != TYPE_CODE_FUNC)
fprintf_filtered (stream, "%.*s: ",
ada_name_prefix_len (varstring), varstring);
if (type_name != NULL && show <= 0)
{
fprintf_filtered (stream, "%.*s",
ada_name_prefix_len (type_name), type_name);
return;
}
if (ada_is_aligner_type (type))
ada_print_type (ada_aligned_type (type), "", stream, show, level);
else if (ada_is_packed_array_type (type))
print_array_type (type, stream, show, level);
else
switch (TYPE_CODE (type))
{
default:
fprintf_filtered (stream, "<");
c_print_type (type, "", stream, show, level);
fprintf_filtered (stream, ">");
break;
case TYPE_CODE_PTR:
fprintf_filtered (stream, "access ");
ada_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);
break;
case TYPE_CODE_REF:
fprintf_filtered (stream, "<ref> ");
ada_print_type (TYPE_TARGET_TYPE (type), "", stream, show, level);
break;
case TYPE_CODE_ARRAY:
print_array_type (type, stream, show, level);
break;
case TYPE_CODE_INT:
if (ada_is_fixed_point_type (type))
print_fixed_point_type (type, stream);
else if (ada_is_vax_floating_type (type))
print_vax_floating_point_type (type, stream);
else
{
char *name = ada_type_name (type);
if (!ada_is_range_type_name (name))
fprintf_filtered (stream, "<%d-byte integer>",
TYPE_LENGTH (type));
else
{
fprintf_filtered (stream, "range ");
print_range_type_named (name, stream);
}
}
break;
case TYPE_CODE_RANGE:
if (ada_is_fixed_point_type (type))
print_fixed_point_type (type, stream);
else if (ada_is_vax_floating_type (type))
print_vax_floating_point_type (type, stream);
else if (ada_is_modular_type (type))
fprintf_filtered (stream, "mod %ld", (long) ada_modulus (type));
else
{
fprintf_filtered (stream, "range ");
print_range (type, stream);
}
break;
case TYPE_CODE_FLT:
fprintf_filtered (stream, "<%d-byte float>", TYPE_LENGTH (type));
break;
case TYPE_CODE_ENUM:
if (show < 0)
fprintf_filtered (stream, "(...)");
else
print_enum_type (type, stream);
break;
case TYPE_CODE_STRUCT:
if (ada_is_array_descriptor (type))
print_array_type (type, stream, show, level);
else if (ada_is_bogus_array_descriptor (type))
fprintf_filtered (stream,
"array (?) of ? (<mal-formed descriptor>)");
else
print_record_type (type, stream, show, level);
break;
case TYPE_CODE_UNION:
print_unchecked_union_type (type, stream, show, level);
break;
case TYPE_CODE_FUNC:
print_func_type (type, stream, varstring);
break;
}
}