574 lines
17 KiB
C
574 lines
17 KiB
C
/* Support for printing C values for GDB, the GNU debugger.
|
||
Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1997,
|
||
1998, 1999, 2000
|
||
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., 59 Temple Place - Suite 330,
|
||
Boston, MA 02111-1307, USA. */
|
||
|
||
#include "defs.h"
|
||
#include "symtab.h"
|
||
#include "gdbtypes.h"
|
||
#include "expression.h"
|
||
#include "value.h"
|
||
#include "valprint.h"
|
||
#include "language.h"
|
||
#include "c-lang.h"
|
||
#include "cp-abi.h"
|
||
|
||
|
||
/* Print function pointer with inferior address ADDRESS onto stdio
|
||
stream STREAM. */
|
||
|
||
static void
|
||
print_function_pointer_address (CORE_ADDR address, struct ui_file *stream)
|
||
{
|
||
CORE_ADDR func_addr = CONVERT_FROM_FUNC_PTR_ADDR (address);
|
||
|
||
/* If the function pointer is represented by a description, print the
|
||
address of the description. */
|
||
if (addressprint && func_addr != address)
|
||
{
|
||
fputs_filtered ("@", stream);
|
||
print_address_numeric (address, 1, stream);
|
||
fputs_filtered (": ", stream);
|
||
}
|
||
print_address_demangle (func_addr, stream, demangle);
|
||
}
|
||
|
||
|
||
/* Print data of type TYPE located at VALADDR (within GDB), which came from
|
||
the inferior at address ADDRESS, onto stdio stream STREAM according to
|
||
FORMAT (a letter or 0 for natural format). The data at VALADDR is in
|
||
target byte order.
|
||
|
||
If the data are a string pointer, returns the number of string characters
|
||
printed.
|
||
|
||
If DEREF_REF is nonzero, then dereference references, otherwise just print
|
||
them like pointers.
|
||
|
||
The PRETTY parameter controls prettyprinting. */
|
||
|
||
int
|
||
c_val_print (struct type *type, char *valaddr, int embedded_offset,
|
||
CORE_ADDR address, struct ui_file *stream, int format,
|
||
int deref_ref, int recurse, enum val_prettyprint pretty)
|
||
{
|
||
register unsigned int i = 0; /* Number of characters printed */
|
||
unsigned len;
|
||
struct type *elttype;
|
||
unsigned eltlen;
|
||
LONGEST val;
|
||
CORE_ADDR addr;
|
||
|
||
CHECK_TYPEDEF (type);
|
||
switch (TYPE_CODE (type))
|
||
{
|
||
case TYPE_CODE_ARRAY:
|
||
elttype = check_typedef (TYPE_TARGET_TYPE (type));
|
||
if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
|
||
{
|
||
eltlen = TYPE_LENGTH (elttype);
|
||
len = TYPE_LENGTH (type) / eltlen;
|
||
if (prettyprint_arrays)
|
||
{
|
||
print_spaces_filtered (2 + 2 * recurse, stream);
|
||
}
|
||
/* For an array of chars, print with string syntax. */
|
||
if (eltlen == 1 &&
|
||
((TYPE_CODE (elttype) == TYPE_CODE_INT)
|
||
|| ((current_language->la_language == language_m2)
|
||
&& (TYPE_CODE (elttype) == TYPE_CODE_CHAR)))
|
||
&& (format == 0 || format == 's'))
|
||
{
|
||
/* If requested, look for the first null char and only print
|
||
elements up to it. */
|
||
if (stop_print_at_null)
|
||
{
|
||
unsigned int temp_len;
|
||
|
||
/* Look for a NULL char. */
|
||
for (temp_len = 0;
|
||
(valaddr + embedded_offset)[temp_len]
|
||
&& temp_len < len && temp_len < print_max;
|
||
temp_len++);
|
||
len = temp_len;
|
||
}
|
||
|
||
LA_PRINT_STRING (stream, valaddr + embedded_offset, len, eltlen, 0);
|
||
i = len;
|
||
}
|
||
else
|
||
{
|
||
fprintf_filtered (stream, "{");
|
||
/* If this is a virtual function table, print the 0th
|
||
entry specially, and the rest of the members normally. */
|
||
if (cp_is_vtbl_ptr_type (elttype))
|
||
{
|
||
i = 1;
|
||
fprintf_filtered (stream, "%d vtable entries", len - 1);
|
||
}
|
||
else
|
||
{
|
||
i = 0;
|
||
}
|
||
val_print_array_elements (type, valaddr + embedded_offset, address, stream,
|
||
format, deref_ref, recurse, pretty, i);
|
||
fprintf_filtered (stream, "}");
|
||
}
|
||
break;
|
||
}
|
||
/* Array of unspecified length: treat like pointer to first elt. */
|
||
addr = address;
|
||
goto print_unpacked_pointer;
|
||
|
||
case TYPE_CODE_PTR:
|
||
if (format && format != 's')
|
||
{
|
||
print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
|
||
break;
|
||
}
|
||
if (vtblprint && cp_is_vtbl_ptr_type (type))
|
||
{
|
||
/* Print the unmangled name if desired. */
|
||
/* Print vtable entry - we only get here if we ARE using
|
||
-fvtable_thunks. (Otherwise, look under TYPE_CODE_STRUCT.) */
|
||
CORE_ADDR addr
|
||
= extract_typed_address (valaddr + embedded_offset, type);
|
||
print_function_pointer_address (addr, stream);
|
||
break;
|
||
}
|
||
elttype = check_typedef (TYPE_TARGET_TYPE (type));
|
||
if (TYPE_CODE (elttype) == TYPE_CODE_METHOD)
|
||
{
|
||
cp_print_class_method (valaddr + embedded_offset, type, stream);
|
||
}
|
||
else if (TYPE_CODE (elttype) == TYPE_CODE_MEMBER)
|
||
{
|
||
cp_print_class_member (valaddr + embedded_offset,
|
||
TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
|
||
stream, "&");
|
||
}
|
||
else
|
||
{
|
||
addr = unpack_pointer (type, valaddr + embedded_offset);
|
||
print_unpacked_pointer:
|
||
elttype = check_typedef (TYPE_TARGET_TYPE (type));
|
||
|
||
if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
|
||
{
|
||
/* Try to print what function it points to. */
|
||
print_function_pointer_address (addr, stream);
|
||
/* Return value is irrelevant except for string pointers. */
|
||
return (0);
|
||
}
|
||
|
||
if (addressprint && format != 's')
|
||
{
|
||
print_address_numeric (addr, 1, stream);
|
||
}
|
||
|
||
/* For a pointer to char or unsigned char, also print the string
|
||
pointed to, unless pointer is null. */
|
||
/* FIXME: need to handle wchar_t here... */
|
||
|
||
if (TYPE_LENGTH (elttype) == 1
|
||
&& TYPE_CODE (elttype) == TYPE_CODE_INT
|
||
&& (format == 0 || format == 's')
|
||
&& addr != 0)
|
||
{
|
||
i = val_print_string (addr, -1, TYPE_LENGTH (elttype), stream);
|
||
}
|
||
else if (cp_is_vtbl_member (type))
|
||
{
|
||
/* print vtbl's nicely */
|
||
CORE_ADDR vt_address = unpack_pointer (type, valaddr + embedded_offset);
|
||
|
||
struct minimal_symbol *msymbol =
|
||
lookup_minimal_symbol_by_pc (vt_address);
|
||
if ((msymbol != NULL) &&
|
||
(vt_address == SYMBOL_VALUE_ADDRESS (msymbol)))
|
||
{
|
||
fputs_filtered (" <", stream);
|
||
fputs_filtered (SYMBOL_SOURCE_NAME (msymbol), stream);
|
||
fputs_filtered (">", stream);
|
||
}
|
||
if (vt_address && vtblprint)
|
||
{
|
||
value_ptr vt_val;
|
||
struct symbol *wsym = (struct symbol *) NULL;
|
||
struct type *wtype;
|
||
struct symtab *s;
|
||
struct block *block = (struct block *) NULL;
|
||
int is_this_fld;
|
||
|
||
if (msymbol != NULL)
|
||
wsym = lookup_symbol (SYMBOL_NAME (msymbol), block,
|
||
VAR_NAMESPACE, &is_this_fld, &s);
|
||
|
||
if (wsym)
|
||
{
|
||
wtype = SYMBOL_TYPE (wsym);
|
||
}
|
||
else
|
||
{
|
||
wtype = TYPE_TARGET_TYPE (type);
|
||
}
|
||
vt_val = value_at (wtype, vt_address, NULL);
|
||
val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val), 0,
|
||
VALUE_ADDRESS (vt_val), stream, format,
|
||
deref_ref, recurse + 1, pretty);
|
||
if (pretty)
|
||
{
|
||
fprintf_filtered (stream, "\n");
|
||
print_spaces_filtered (2 + 2 * recurse, stream);
|
||
}
|
||
}
|
||
}
|
||
|
||
/* Return number of characters printed, including the terminating
|
||
'\0' if we reached the end. val_print_string takes care including
|
||
the terminating '\0' if necessary. */
|
||
return i;
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_MEMBER:
|
||
error ("not implemented: member type in c_val_print");
|
||
break;
|
||
|
||
case TYPE_CODE_REF:
|
||
elttype = check_typedef (TYPE_TARGET_TYPE (type));
|
||
if (TYPE_CODE (elttype) == TYPE_CODE_MEMBER)
|
||
{
|
||
cp_print_class_member (valaddr + embedded_offset,
|
||
TYPE_DOMAIN_TYPE (elttype),
|
||
stream, "");
|
||
break;
|
||
}
|
||
if (addressprint)
|
||
{
|
||
CORE_ADDR addr
|
||
= extract_typed_address (valaddr + embedded_offset, type);
|
||
fprintf_filtered (stream, "@");
|
||
print_address_numeric (addr, 1, stream);
|
||
if (deref_ref)
|
||
fputs_filtered (": ", stream);
|
||
}
|
||
/* De-reference the reference. */
|
||
if (deref_ref)
|
||
{
|
||
if (TYPE_CODE (elttype) != TYPE_CODE_UNDEF)
|
||
{
|
||
value_ptr deref_val =
|
||
value_at
|
||
(TYPE_TARGET_TYPE (type),
|
||
unpack_pointer (lookup_pointer_type (builtin_type_void),
|
||
valaddr + embedded_offset),
|
||
NULL);
|
||
val_print (VALUE_TYPE (deref_val),
|
||
VALUE_CONTENTS (deref_val),
|
||
0,
|
||
VALUE_ADDRESS (deref_val),
|
||
stream,
|
||
format,
|
||
deref_ref,
|
||
recurse,
|
||
pretty);
|
||
}
|
||
else
|
||
fputs_filtered ("???", stream);
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_UNION:
|
||
if (recurse && !unionprint)
|
||
{
|
||
fprintf_filtered (stream, "{...}");
|
||
break;
|
||
}
|
||
/* Fall through. */
|
||
case TYPE_CODE_STRUCT:
|
||
/*FIXME: Abstract this away */
|
||
if (vtblprint && cp_is_vtbl_ptr_type (type))
|
||
{
|
||
/* Print the unmangled name if desired. */
|
||
/* Print vtable entry - we only get here if NOT using
|
||
-fvtable_thunks. (Otherwise, look under TYPE_CODE_PTR.) */
|
||
int offset = (embedded_offset +
|
||
TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8);
|
||
struct type *field_type = TYPE_FIELD_TYPE (type, VTBL_FNADDR_OFFSET);
|
||
CORE_ADDR addr
|
||
= extract_typed_address (valaddr + offset, field_type);
|
||
|
||
print_function_pointer_address (addr, stream);
|
||
}
|
||
else
|
||
cp_print_value_fields (type, type, valaddr, embedded_offset, address, stream, format,
|
||
recurse, pretty, NULL, 0);
|
||
break;
|
||
|
||
case TYPE_CODE_ENUM:
|
||
if (format)
|
||
{
|
||
print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
|
||
break;
|
||
}
|
||
len = TYPE_NFIELDS (type);
|
||
val = unpack_long (type, valaddr + embedded_offset);
|
||
for (i = 0; i < len; i++)
|
||
{
|
||
QUIT;
|
||
if (val == TYPE_FIELD_BITPOS (type, i))
|
||
{
|
||
break;
|
||
}
|
||
}
|
||
if (i < len)
|
||
{
|
||
fputs_filtered (TYPE_FIELD_NAME (type, i), stream);
|
||
}
|
||
else
|
||
{
|
||
print_longest (stream, 'd', 0, val);
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_FUNC:
|
||
if (format)
|
||
{
|
||
print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
|
||
break;
|
||
}
|
||
/* FIXME, we should consider, at least for ANSI C language, eliminating
|
||
the distinction made between FUNCs and POINTERs to FUNCs. */
|
||
fprintf_filtered (stream, "{");
|
||
type_print (type, "", stream, -1);
|
||
fprintf_filtered (stream, "} ");
|
||
/* Try to print what function it points to, and its address. */
|
||
print_address_demangle (address, stream, demangle);
|
||
break;
|
||
|
||
case TYPE_CODE_BOOL:
|
||
format = format ? format : output_format;
|
||
if (format)
|
||
print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
|
||
else
|
||
{
|
||
val = unpack_long (type, valaddr + embedded_offset);
|
||
if (val == 0)
|
||
fputs_filtered ("false", stream);
|
||
else if (val == 1)
|
||
fputs_filtered ("true", stream);
|
||
else
|
||
print_longest (stream, 'd', 0, val);
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_RANGE:
|
||
/* FIXME: create_range_type does not set the unsigned bit in a
|
||
range type (I think it probably should copy it from the target
|
||
type), so we won't print values which are too large to
|
||
fit in a signed integer correctly. */
|
||
/* FIXME: Doesn't handle ranges of enums correctly. (Can't just
|
||
print with the target type, though, because the size of our type
|
||
and the target type might differ). */
|
||
/* FALLTHROUGH */
|
||
|
||
case TYPE_CODE_INT:
|
||
format = format ? format : output_format;
|
||
if (format)
|
||
{
|
||
print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
|
||
}
|
||
else
|
||
{
|
||
val_print_type_code_int (type, valaddr + embedded_offset, stream);
|
||
/* C and C++ has no single byte int type, char is used instead.
|
||
Since we don't know whether the value is really intended to
|
||
be used as an integer or a character, print the character
|
||
equivalent as well. */
|
||
if (TYPE_LENGTH (type) == 1)
|
||
{
|
||
fputs_filtered (" ", stream);
|
||
LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr + embedded_offset),
|
||
stream);
|
||
}
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_CHAR:
|
||
format = format ? format : output_format;
|
||
if (format)
|
||
{
|
||
print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
|
||
}
|
||
else
|
||
{
|
||
val = unpack_long (type, valaddr + embedded_offset);
|
||
if (TYPE_UNSIGNED (type))
|
||
fprintf_filtered (stream, "%u", (unsigned int) val);
|
||
else
|
||
fprintf_filtered (stream, "%d", (int) val);
|
||
fputs_filtered (" ", stream);
|
||
LA_PRINT_CHAR ((unsigned char) val, stream);
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_FLT:
|
||
if (format)
|
||
{
|
||
print_scalar_formatted (valaddr + embedded_offset, type, format, 0, stream);
|
||
}
|
||
else
|
||
{
|
||
print_floating (valaddr + embedded_offset, type, stream);
|
||
}
|
||
break;
|
||
|
||
case TYPE_CODE_METHOD:
|
||
cp_print_class_method (valaddr + embedded_offset, lookup_pointer_type (type), stream);
|
||
break;
|
||
|
||
case TYPE_CODE_VOID:
|
||
fprintf_filtered (stream, "void");
|
||
break;
|
||
|
||
case TYPE_CODE_ERROR:
|
||
fprintf_filtered (stream, "<error type>");
|
||
break;
|
||
|
||
case TYPE_CODE_UNDEF:
|
||
/* This happens (without TYPE_FLAG_STUB set) on systems which don't use
|
||
dbx xrefs (NO_DBX_XREFS in gcc) if a file has a "struct foo *bar"
|
||
and no complete type for struct foo in that file. */
|
||
fprintf_filtered (stream, "<incomplete type>");
|
||
break;
|
||
|
||
default:
|
||
error ("Invalid C/C++ type code %d in symbol table.", TYPE_CODE (type));
|
||
}
|
||
gdb_flush (stream);
|
||
return (0);
|
||
}
|
||
|
||
int
|
||
c_value_print (value_ptr val, struct ui_file *stream, int format,
|
||
enum val_prettyprint pretty)
|
||
{
|
||
struct type *type = VALUE_TYPE (val);
|
||
struct type *real_type;
|
||
int full, top, using_enc;
|
||
|
||
/* If it is a pointer, indicate what it points to.
|
||
|
||
Print type also if it is a reference.
|
||
|
||
C++: if it is a member pointer, we will take care
|
||
of that when we print it. */
|
||
if (TYPE_CODE (type) == TYPE_CODE_PTR ||
|
||
TYPE_CODE (type) == TYPE_CODE_REF)
|
||
{
|
||
/* Hack: remove (char *) for char strings. Their
|
||
type is indicated by the quoted string anyway. */
|
||
if (TYPE_CODE (type) == TYPE_CODE_PTR &&
|
||
TYPE_NAME (type) == NULL &&
|
||
TYPE_NAME (TYPE_TARGET_TYPE (type)) != NULL &&
|
||
STREQ (TYPE_NAME (TYPE_TARGET_TYPE (type)), "char"))
|
||
{
|
||
/* Print nothing */
|
||
}
|
||
else if (objectprint && (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_CLASS))
|
||
{
|
||
|
||
if (TYPE_CODE(type) == TYPE_CODE_REF)
|
||
{
|
||
/* Copy value, change to pointer, so we don't get an
|
||
* error about a non-pointer type in value_rtti_target_type
|
||
*/
|
||
value_ptr temparg;
|
||
temparg=value_copy(val);
|
||
VALUE_TYPE (temparg) = lookup_pointer_type(TYPE_TARGET_TYPE(type));
|
||
val=temparg;
|
||
}
|
||
/* Pointer to class, check real type of object */
|
||
fprintf_filtered (stream, "(");
|
||
real_type = value_rtti_target_type (val, &full, &top, &using_enc);
|
||
if (real_type)
|
||
{
|
||
/* RTTI entry found */
|
||
if (TYPE_CODE (type) == TYPE_CODE_PTR)
|
||
{
|
||
/* create a pointer type pointing to the real type */
|
||
type = lookup_pointer_type (real_type);
|
||
}
|
||
else
|
||
{
|
||
/* create a reference type referencing the real type */
|
||
type = lookup_reference_type (real_type);
|
||
}
|
||
/* JYG: Need to adjust pointer value. */
|
||
val->aligner.contents[0] -= top;
|
||
|
||
/* Note: When we look up RTTI entries, we don't get any
|
||
information on const or volatile attributes */
|
||
}
|
||
type_print (type, "", stream, -1);
|
||
fprintf_filtered (stream, ") ");
|
||
}
|
||
else
|
||
{
|
||
/* normal case */
|
||
fprintf_filtered (stream, "(");
|
||
type_print (type, "", stream, -1);
|
||
fprintf_filtered (stream, ") ");
|
||
}
|
||
}
|
||
if (objectprint && (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_CLASS))
|
||
{
|
||
/* Attempt to determine real type of object */
|
||
real_type = value_rtti_type (val, &full, &top, &using_enc);
|
||
if (real_type)
|
||
{
|
||
/* We have RTTI information, so use it */
|
||
val = value_full_object (val, real_type, full, top, using_enc);
|
||
fprintf_filtered (stream, "(%s%s) ",
|
||
TYPE_NAME (real_type),
|
||
full ? "" : " [incomplete object]");
|
||
/* Print out object: enclosing type is same as real_type if full */
|
||
return val_print (VALUE_ENCLOSING_TYPE (val), VALUE_CONTENTS_ALL (val), 0,
|
||
VALUE_ADDRESS (val), stream, format, 1, 0, pretty);
|
||
/* Note: When we look up RTTI entries, we don't get any information on
|
||
const or volatile attributes */
|
||
}
|
||
else if (type != VALUE_ENCLOSING_TYPE (val))
|
||
{
|
||
/* No RTTI information, so let's do our best */
|
||
fprintf_filtered (stream, "(%s ?) ",
|
||
TYPE_NAME (VALUE_ENCLOSING_TYPE (val)));
|
||
return val_print (VALUE_ENCLOSING_TYPE (val), VALUE_CONTENTS_ALL (val), 0,
|
||
VALUE_ADDRESS (val), stream, format, 1, 0, pretty);
|
||
}
|
||
/* Otherwise, we end up at the return outside this "if" */
|
||
}
|
||
|
||
return val_print (type, VALUE_CONTENTS_ALL (val), VALUE_EMBEDDED_OFFSET (val),
|
||
VALUE_ADDRESS (val),
|
||
stream, format, 1, 0, pretty);
|
||
}
|