1 /* Modula 2 language support routines for GDB, the GNU debugger.
3 Copyright (C) 1992-2020 Free Software Foundation, Inc.
5 This file is part of GDB.
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>. */
23 #include "expression.h"
24 #include "parser-defs.h"
32 static void m2_printchar (int, struct type
*, struct ui_file
*);
34 /* FIXME: This is a copy of the same function from c-exp.y. It should
35 be replaced with a true Modula version. */
38 m2_printchar (int c
, struct type
*type
, struct ui_file
*stream
)
40 fputs_filtered ("'", stream
);
41 LA_EMIT_CHAR (c
, type
, stream
, '\'');
42 fputs_filtered ("'", stream
);
46 evaluate_subexp_modula2 (struct type
*expect_type
, struct expression
*exp
,
47 int *pos
, enum noside noside
)
49 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
58 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
60 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
64 arg1
= coerce_ref (arg1
);
65 type
= check_typedef (value_type (arg1
));
67 if (m2_is_unbounded_array (type
))
69 struct value
*temp
= arg1
;
71 type
= type
->field (1).type ();
72 /* i18n: Do not translate the "_m2_high" part! */
73 arg1
= value_struct_elt (&temp
, NULL
, "_m2_high", NULL
,
74 _("unbounded structure "
75 "missing _m2_high field"));
77 if (value_type (arg1
) != type
)
78 arg1
= value_cast (type
, arg1
);
85 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
86 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
87 if (noside
== EVAL_SKIP
)
89 /* If the user attempts to subscript something that is not an
90 array or pointer type (like a plain int variable for example),
91 then report this as an error. */
93 arg1
= coerce_ref (arg1
);
94 type
= check_typedef (value_type (arg1
));
96 if (m2_is_unbounded_array (type
))
98 struct value
*temp
= arg1
;
99 type
= type
->field (0).type ();
100 if (type
== NULL
|| (type
->code () != TYPE_CODE_PTR
))
102 warning (_("internal error: unbounded "
103 "array structure is unknown"));
104 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
106 /* i18n: Do not translate the "_m2_contents" part! */
107 arg1
= value_struct_elt (&temp
, NULL
, "_m2_contents", NULL
,
108 _("unbounded structure "
109 "missing _m2_contents field"));
111 if (value_type (arg1
) != type
)
112 arg1
= value_cast (type
, arg1
);
114 check_typedef (value_type (arg1
));
115 return value_ind (value_ptradd (arg1
, value_as_long (arg2
)));
118 if (type
->code () != TYPE_CODE_ARRAY
)
121 error (_("cannot subscript something of type `%s'"),
124 error (_("cannot subscript requested type"));
127 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
128 return value_zero (TYPE_TARGET_TYPE (type
), VALUE_LVAL (arg1
));
130 return value_subscript (arg1
, value_as_long (arg2
));
133 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
137 return value_from_longest (builtin_type (exp
->gdbarch
)->builtin_int
, 1);
141 /* Table of operators and their precedences for printing expressions. */
143 static const struct op_print m2_op_print_tab
[] =
145 {"+", BINOP_ADD
, PREC_ADD
, 0},
146 {"+", UNOP_PLUS
, PREC_PREFIX
, 0},
147 {"-", BINOP_SUB
, PREC_ADD
, 0},
148 {"-", UNOP_NEG
, PREC_PREFIX
, 0},
149 {"*", BINOP_MUL
, PREC_MUL
, 0},
150 {"/", BINOP_DIV
, PREC_MUL
, 0},
151 {"DIV", BINOP_INTDIV
, PREC_MUL
, 0},
152 {"MOD", BINOP_REM
, PREC_MUL
, 0},
153 {":=", BINOP_ASSIGN
, PREC_ASSIGN
, 1},
154 {"OR", BINOP_LOGICAL_OR
, PREC_LOGICAL_OR
, 0},
155 {"AND", BINOP_LOGICAL_AND
, PREC_LOGICAL_AND
, 0},
156 {"NOT", UNOP_LOGICAL_NOT
, PREC_PREFIX
, 0},
157 {"=", BINOP_EQUAL
, PREC_EQUAL
, 0},
158 {"<>", BINOP_NOTEQUAL
, PREC_EQUAL
, 0},
159 {"<=", BINOP_LEQ
, PREC_ORDER
, 0},
160 {">=", BINOP_GEQ
, PREC_ORDER
, 0},
161 {">", BINOP_GTR
, PREC_ORDER
, 0},
162 {"<", BINOP_LESS
, PREC_ORDER
, 0},
163 {"^", UNOP_IND
, PREC_PREFIX
, 0},
164 {"@", BINOP_REPEAT
, PREC_REPEAT
, 0},
165 {"CAP", UNOP_CAP
, PREC_BUILTIN_FUNCTION
, 0},
166 {"CHR", UNOP_CHR
, PREC_BUILTIN_FUNCTION
, 0},
167 {"ORD", UNOP_ORD
, PREC_BUILTIN_FUNCTION
, 0},
168 {"FLOAT", UNOP_FLOAT
, PREC_BUILTIN_FUNCTION
, 0},
169 {"HIGH", UNOP_HIGH
, PREC_BUILTIN_FUNCTION
, 0},
170 {"MAX", UNOP_MAX
, PREC_BUILTIN_FUNCTION
, 0},
171 {"MIN", UNOP_MIN
, PREC_BUILTIN_FUNCTION
, 0},
172 {"ODD", UNOP_ODD
, PREC_BUILTIN_FUNCTION
, 0},
173 {"TRUNC", UNOP_TRUNC
, PREC_BUILTIN_FUNCTION
, 0},
174 {NULL
, OP_NULL
, PREC_BUILTIN_FUNCTION
, 0}
177 /* The built-in types of Modula-2. */
179 enum m2_primitive_types
{
180 m2_primitive_type_char
,
181 m2_primitive_type_int
,
182 m2_primitive_type_card
,
183 m2_primitive_type_real
,
184 m2_primitive_type_bool
,
185 nr_m2_primitive_types
188 const struct exp_descriptor exp_descriptor_modula2
=
190 print_subexp_standard
,
191 operator_length_standard
,
192 operator_check_standard
,
194 dump_subexp_body_standard
,
195 evaluate_subexp_modula2
198 /* Constant data describing the M2 language. */
200 extern const struct language_data m2_language_data
=
210 &exp_descriptor_modula2
,
211 false, /* la_store_sym_names_in_linkage_form_p */
212 m2_op_print_tab
, /* expression operators for printing */
213 0, /* arrays are first-class (not c-style) */
214 0, /* String lower bound */
218 /* Class representing the M2 language. */
220 class m2_language
: public language_defn
224 : language_defn (language_m2
, m2_language_data
)
227 /* See language.h. */
228 void language_arch_info (struct gdbarch
*gdbarch
,
229 struct language_arch_info
*lai
) const override
231 const struct builtin_m2_type
*builtin
= builtin_m2_type (gdbarch
);
233 lai
->string_char_type
= builtin
->builtin_char
;
234 lai
->primitive_type_vector
235 = GDBARCH_OBSTACK_CALLOC (gdbarch
, nr_m2_primitive_types
+ 1,
238 lai
->primitive_type_vector
[m2_primitive_type_char
]
239 = builtin
->builtin_char
;
240 lai
->primitive_type_vector
[m2_primitive_type_int
]
241 = builtin
->builtin_int
;
242 lai
->primitive_type_vector
[m2_primitive_type_card
]
243 = builtin
->builtin_card
;
244 lai
->primitive_type_vector
[m2_primitive_type_real
]
245 = builtin
->builtin_real
;
246 lai
->primitive_type_vector
[m2_primitive_type_bool
]
247 = builtin
->builtin_bool
;
249 lai
->bool_type_symbol
= "BOOLEAN";
250 lai
->bool_type_default
= builtin
->builtin_bool
;
253 /* See language.h. */
255 void print_type (struct type
*type
, const char *varstring
,
256 struct ui_file
*stream
, int show
, int level
,
257 const struct type_print_options
*flags
) const override
259 m2_print_type (type
, varstring
, stream
, show
, level
, flags
);
262 /* See language.h. */
264 void value_print_inner
265 (struct value
*val
, struct ui_file
*stream
, int recurse
,
266 const struct value_print_options
*options
) const override
268 return m2_value_print_inner (val
, stream
, recurse
, options
);
271 /* See language.h. */
273 int parser (struct parser_state
*ps
) const override
275 return m2_parse (ps
);
278 /* See language.h. */
280 void emitchar (int ch
, struct type
*chtype
,
281 struct ui_file
*stream
, int quoter
) const override
283 ch
&= 0xFF; /* Avoid sign bit follies. */
285 if (PRINT_LITERAL_FORM (ch
))
287 if (ch
== '\\' || ch
== quoter
)
288 fputs_filtered ("\\", stream
);
289 fprintf_filtered (stream
, "%c", ch
);
296 fputs_filtered ("\\n", stream
);
299 fputs_filtered ("\\b", stream
);
302 fputs_filtered ("\\t", stream
);
305 fputs_filtered ("\\f", stream
);
308 fputs_filtered ("\\r", stream
);
311 fputs_filtered ("\\e", stream
);
314 fputs_filtered ("\\a", stream
);
317 fprintf_filtered (stream
, "\\%.3o", (unsigned int) ch
);
323 /* See language.h. */
325 void printchar (int ch
, struct type
*chtype
,
326 struct ui_file
*stream
) const override
328 m2_printchar (ch
, chtype
, stream
);
331 /* See language.h. */
333 void printstr (struct ui_file
*stream
, struct type
*elttype
,
334 const gdb_byte
*string
, unsigned int length
,
335 const char *encoding
, int force_ellipses
,
336 const struct value_print_options
*options
) const override
339 unsigned int things_printed
= 0;
345 fputs_filtered ("\"\"", gdb_stdout
);
349 for (i
= 0; i
< length
&& things_printed
< options
->print_max
; ++i
)
351 /* Position of the character we are examining
352 to see whether it is repeated. */
354 /* Number of repetitions we have detected so far. */
361 fputs_filtered (", ", stream
);
367 while (rep1
< length
&& string
[rep1
] == string
[i
])
373 if (reps
> options
->repeat_count_threshold
)
377 fputs_filtered ("\", ", stream
);
380 m2_printchar (string
[i
], elttype
, stream
);
381 fprintf_filtered (stream
, " <repeats %u times>", reps
);
383 things_printed
+= options
->repeat_count_threshold
;
390 fputs_filtered ("\"", stream
);
393 LA_EMIT_CHAR (string
[i
], elttype
, stream
, '"');
398 /* Terminate the quotes if necessary. */
400 fputs_filtered ("\"", stream
);
402 if (force_ellipses
|| i
< length
)
403 fputs_filtered ("...", stream
);
406 /* See language.h. */
408 void print_typedef (struct type
*type
, struct symbol
*new_symbol
,
409 struct ui_file
*stream
) const override
411 m2_print_typedef (type
, new_symbol
, stream
);
414 /* See language.h. */
416 bool is_string_type_p (struct type
*type
) const override
418 type
= check_typedef (type
);
419 if (type
->code () == TYPE_CODE_ARRAY
420 && TYPE_LENGTH (type
) > 0
421 && TYPE_LENGTH (TYPE_TARGET_TYPE (type
)) > 0)
423 struct type
*elttype
= check_typedef (TYPE_TARGET_TYPE (type
));
425 if (TYPE_LENGTH (elttype
) == 1
426 && (elttype
->code () == TYPE_CODE_INT
427 || elttype
->code () == TYPE_CODE_CHAR
))
435 /* Single instance of the M2 language. */
437 static m2_language m2_language_defn
;
440 build_m2_types (struct gdbarch
*gdbarch
)
442 struct builtin_m2_type
*builtin_m2_type
443 = GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct builtin_m2_type
);
445 /* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
446 builtin_m2_type
->builtin_int
447 = arch_integer_type (gdbarch
, gdbarch_int_bit (gdbarch
), 0, "INTEGER");
448 builtin_m2_type
->builtin_card
449 = arch_integer_type (gdbarch
, gdbarch_int_bit (gdbarch
), 1, "CARDINAL");
450 builtin_m2_type
->builtin_real
451 = arch_float_type (gdbarch
, gdbarch_float_bit (gdbarch
), "REAL",
452 gdbarch_float_format (gdbarch
));
453 builtin_m2_type
->builtin_char
454 = arch_character_type (gdbarch
, TARGET_CHAR_BIT
, 1, "CHAR");
455 builtin_m2_type
->builtin_bool
456 = arch_boolean_type (gdbarch
, gdbarch_int_bit (gdbarch
), 1, "BOOLEAN");
458 return builtin_m2_type
;
461 static struct gdbarch_data
*m2_type_data
;
463 const struct builtin_m2_type
*
464 builtin_m2_type (struct gdbarch
*gdbarch
)
466 return (const struct builtin_m2_type
*) gdbarch_data (gdbarch
, m2_type_data
);
470 /* Initialization for Modula-2 */
472 void _initialize_m2_language ();
474 _initialize_m2_language ()
476 m2_type_data
= gdbarch_data_register_post_init (build_m2_types
);