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- /* Support for printing C values for GDB, the GNU debugger.
- Copyright 1986, 1988, 1989, 1991, 1992, 1993, 1994
- 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 "symtab.h"
- #include "gdbtypes.h"
- #include "expression.h"
- #include "value.h"
- #include "demangle.h"
- #include "valprint.h"
- #include "language.h"
-
- /* BEGIN-FIXME */
-
- extern int vtblprint; /* Controls printing of vtbl's */
-
- extern void
- cp_print_class_member PARAMS ((char *, struct type *, GDB_FILE *, char *));
-
- extern void
- cp_print_class_method PARAMS ((char *, struct type *, GDB_FILE *));
-
- extern void
- cp_print_value_fields PARAMS ((struct type *, char *, GDB_FILE *, int, int,
- enum val_prettyprint, struct type **));
-
- extern int
- cp_is_vtbl_ptr_type PARAMS ((struct type *));
-
- extern int
- cp_is_vtbl_member PARAMS ((struct type *));
-
- /* END-FIXME */
-
-
- /* BEGIN-FIXME: Hooks into c-typeprint.c */
-
- extern void
- c_type_print_varspec_prefix PARAMS ((struct type *, GDB_FILE *, int, int));
-
- extern void
- cp_type_print_method_args PARAMS ((struct type **, char *, char *, int,
- GDB_FILE *));
- /* END-FIXME */
-
-
- extern struct obstack dont_print_obstack;
-
-
- /* 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 (type, valaddr, address, stream, format, deref_ref, recurse,
- pretty)
- struct type *type;
- char *valaddr;
- CORE_ADDR address;
- GDB_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;
-
- switch (TYPE_CODE (type))
- {
- case TYPE_CODE_ARRAY:
- if (TYPE_LENGTH (type) > 0 && TYPE_LENGTH (TYPE_TARGET_TYPE (type)) > 0)
- {
- elttype = TYPE_TARGET_TYPE (type);
- 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)
- {
- int temp_len;
-
- /* Look for a NULL char. */
- for (temp_len = 0;
- valaddr[temp_len]
- && temp_len < len && temp_len < print_max;
- temp_len++);
- len = temp_len;
- }
-
- LA_PRINT_STRING (stream, valaddr, len, 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, 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, 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.) */
- print_address_demangle(extract_address (valaddr, TYPE_LENGTH (type)),
- stream, demangle);
- break;
- }
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_METHOD)
- {
- cp_print_class_method (valaddr, type, stream);
- }
- else if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
- {
- cp_print_class_member (valaddr,
- TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
- stream, "&");
- }
- else
- {
- addr = unpack_pointer (type, valaddr);
- print_unpacked_pointer:
- elttype = TYPE_TARGET_TYPE (type);
-
- if (TYPE_CODE (elttype) == TYPE_CODE_FUNC)
- {
- /* Try to print what function it points to. */
- print_address_demangle (addr, stream, demangle);
- /* 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. */
- if (TYPE_LENGTH (elttype) == 1
- && TYPE_CODE (elttype) == TYPE_CODE_INT
- && (format == 0 || format == 's')
- && addr != 0)
- {
- i = val_print_string (addr, 0, stream);
- }
- else if (cp_is_vtbl_member(type))
- {
- /* print vtbl's nicely */
- CORE_ADDR vt_address = unpack_pointer (type, valaddr);
-
- 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);
- val_print (VALUE_TYPE (vt_val), VALUE_CONTENTS (vt_val),
- 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:
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) == TYPE_CODE_MEMBER)
- {
- cp_print_class_member (valaddr,
- TYPE_DOMAIN_TYPE (TYPE_TARGET_TYPE (type)),
- stream, "");
- break;
- }
- if (addressprint)
- {
- fprintf_filtered (stream, "@");
- print_address_numeric
- (extract_address (valaddr,
- TARGET_PTR_BIT / HOST_CHAR_BIT), 1, stream);
- if (deref_ref)
- fputs_filtered (": ", stream);
- }
- /* De-reference the reference. */
- if (deref_ref)
- {
- if (TYPE_CODE (TYPE_TARGET_TYPE (type)) != TYPE_CODE_UNDEF)
- {
- value_ptr deref_val =
- value_at
- (TYPE_TARGET_TYPE (type),
- unpack_pointer (lookup_pointer_type (builtin_type_void),
- valaddr));
- val_print (VALUE_TYPE (deref_val),
- VALUE_CONTENTS (deref_val),
- VALUE_ADDRESS (deref_val), stream, format,
- deref_ref, recurse + 1, pretty);
- }
- else
- fputs_filtered ("???", stream);
- }
- break;
-
- case TYPE_CODE_UNION:
- if (recurse && !unionprint)
- {
- fprintf_filtered (stream, "{...}");
- break;
- }
- /* Fall through. */
- case TYPE_CODE_STRUCT:
- 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.) */
- print_address_demangle(*((int *) (valaddr + /* FIXME bytesex */
- TYPE_FIELD_BITPOS (type, VTBL_FNADDR_OFFSET) / 8)),
- stream, demangle);
- break;
- }
- cp_print_value_fields (type, valaddr, stream, format, recurse, pretty,
- 0);
- break;
-
- case TYPE_CODE_ENUM:
- if (format)
- {
- print_scalar_formatted (valaddr, type, format, 0, stream);
- break;
- }
- len = TYPE_NFIELDS (type);
- val = unpack_long (type, valaddr);
- 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, 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:
- /* Do something at least vaguely reasonable, for example if the
- language is set wrong. */
-
- 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, type, format, 0, stream);
- }
- else
- {
- val_print_type_code_int (type, valaddr, 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),
- stream);
- }
- }
- break;
-
- case TYPE_CODE_CHAR:
- format = format ? format : output_format;
- if (format)
- {
- print_scalar_formatted (valaddr, type, format, 0, stream);
- }
- else
- {
- fprintf_filtered (stream, TYPE_UNSIGNED (type) ? "%u" : "%d",
- unpack_long (type, valaddr));
- fputs_filtered (" ", stream);
- LA_PRINT_CHAR ((unsigned char) unpack_long (type, valaddr), stream);
- }
- break;
-
- case TYPE_CODE_FLT:
- if (format)
- {
- print_scalar_formatted (valaddr, type, format, 0, stream);
- }
- else
- {
- print_floating (valaddr, 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 (val, stream, format, pretty)
- value_ptr val;
- GDB_FILE *stream;
- int format;
- enum val_prettyprint pretty;
- {
- /* A "repeated" value really contains several values in a row.
- They are made by the @ operator.
- Print such values as if they were arrays. */
-
- if (VALUE_REPEATED (val))
- {
- register unsigned int n = VALUE_REPETITIONS (val);
- register unsigned int typelen = TYPE_LENGTH (VALUE_TYPE (val));
- fprintf_filtered (stream, "{");
- /* Print arrays of characters using string syntax. */
- if (typelen == 1 && TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_INT
- && format == 0)
- LA_PRINT_STRING (stream, VALUE_CONTENTS (val), n, 0);
- else
- {
- value_print_array_elements (val, stream, format, pretty);
- }
- fprintf_filtered (stream, "}");
- return (n * typelen);
- }
- else
- {
- struct type *type = VALUE_TYPE (val);
-
- /* 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
- {
- fprintf_filtered (stream, "(");
- type_print (type, "", stream, -1);
- fprintf_filtered (stream, ") ");
- }
- }
- return (val_print (type, VALUE_CONTENTS (val),
- VALUE_ADDRESS (val), stream, format, 1, 0, pretty));
- }
- }
-