1 /* Modula 2 language support routines for GDB, the GNU debugger.
3 Copyright (C) 1992-2021 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"
33 /* A helper function for UNOP_HIGH. */
36 eval_op_m2_high (struct type
*expect_type
, struct expression
*exp
,
40 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
44 arg1
= coerce_ref (arg1
);
45 struct type
*type
= check_typedef (value_type (arg1
));
47 if (m2_is_unbounded_array (type
))
49 struct value
*temp
= arg1
;
51 type
= type
->field (1).type ();
52 /* i18n: Do not translate the "_m2_high" part! */
53 arg1
= value_struct_elt (&temp
, NULL
, "_m2_high", NULL
,
54 _("unbounded structure "
55 "missing _m2_high field"));
57 if (value_type (arg1
) != type
)
58 arg1
= value_cast (type
, arg1
);
64 /* A helper function for BINOP_SUBSCRIPT. */
67 eval_op_m2_subscript (struct type
*expect_type
, struct expression
*exp
,
69 struct value
*arg1
, struct value
*arg2
)
71 if (noside
== EVAL_SKIP
)
72 return eval_skip_value (exp
);
73 /* If the user attempts to subscript something that is not an
74 array or pointer type (like a plain int variable for example),
75 then report this as an error. */
77 arg1
= coerce_ref (arg1
);
78 struct type
*type
= check_typedef (value_type (arg1
));
80 if (m2_is_unbounded_array (type
))
82 struct value
*temp
= arg1
;
83 type
= type
->field (0).type ();
84 if (type
== NULL
|| (type
->code () != TYPE_CODE_PTR
))
85 error (_("internal error: unbounded "
86 "array structure is unknown"));
87 /* i18n: Do not translate the "_m2_contents" part! */
88 arg1
= value_struct_elt (&temp
, NULL
, "_m2_contents", NULL
,
89 _("unbounded structure "
90 "missing _m2_contents field"));
92 if (value_type (arg1
) != type
)
93 arg1
= value_cast (type
, arg1
);
95 check_typedef (value_type (arg1
));
96 return value_ind (value_ptradd (arg1
, value_as_long (arg2
)));
99 if (type
->code () != TYPE_CODE_ARRAY
)
102 error (_("cannot subscript something of type `%s'"),
105 error (_("cannot subscript requested type"));
108 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
109 return value_zero (TYPE_TARGET_TYPE (type
), VALUE_LVAL (arg1
));
111 return value_subscript (arg1
, value_as_long (arg2
));
114 static struct value
*
115 evaluate_subexp_modula2 (struct type
*expect_type
, struct expression
*exp
,
116 int *pos
, enum noside noside
)
118 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
126 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
127 return eval_op_m2_high (expect_type
, exp
, noside
, arg1
);
129 case BINOP_SUBSCRIPT
:
131 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
132 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
133 return eval_op_m2_subscript (expect_type
, exp
, noside
, arg1
, arg2
);
136 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
141 /* Table of operators and their precedences for printing expressions. */
143 const struct op_print
m2_language::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}
178 const struct exp_descriptor
m2_language::exp_descriptor_modula2
=
180 print_subexp_standard
,
181 operator_length_standard
,
182 operator_check_standard
,
183 dump_subexp_body_standard
,
184 evaluate_subexp_modula2
187 /* Single instance of the M2 language. */
189 static m2_language m2_language_defn
;
191 /* See language.h. */
194 m2_language::language_arch_info (struct gdbarch
*gdbarch
,
195 struct language_arch_info
*lai
) const
197 const struct builtin_m2_type
*builtin
= builtin_m2_type (gdbarch
);
199 /* Helper function to allow shorter lines below. */
200 auto add
= [&] (struct type
* t
)
202 lai
->add_primitive_type (t
);
205 add (builtin
->builtin_char
);
206 add (builtin
->builtin_int
);
207 add (builtin
->builtin_card
);
208 add (builtin
->builtin_real
);
209 add (builtin
->builtin_bool
);
211 lai
->set_string_char_type (builtin
->builtin_char
);
212 lai
->set_bool_type (builtin
->builtin_bool
, "BOOLEAN");
218 m2_language::printchar (int c
, struct type
*type
,
219 struct ui_file
*stream
) const
221 fputs_filtered ("'", stream
);
222 emitchar (c
, type
, stream
, '\'');
223 fputs_filtered ("'", stream
);
226 /* See language.h. */
229 m2_language::printstr (struct ui_file
*stream
, struct type
*elttype
,
230 const gdb_byte
*string
, unsigned int length
,
231 const char *encoding
, int force_ellipses
,
232 const struct value_print_options
*options
) const
235 unsigned int things_printed
= 0;
241 fputs_filtered ("\"\"", gdb_stdout
);
245 for (i
= 0; i
< length
&& things_printed
< options
->print_max
; ++i
)
247 /* Position of the character we are examining
248 to see whether it is repeated. */
250 /* Number of repetitions we have detected so far. */
257 fputs_filtered (", ", stream
);
263 while (rep1
< length
&& string
[rep1
] == string
[i
])
269 if (reps
> options
->repeat_count_threshold
)
273 fputs_filtered ("\", ", stream
);
276 printchar (string
[i
], elttype
, stream
);
277 fprintf_filtered (stream
, " <repeats %u times>", reps
);
279 things_printed
+= options
->repeat_count_threshold
;
286 fputs_filtered ("\"", stream
);
289 emitchar (string
[i
], elttype
, stream
, '"');
294 /* Terminate the quotes if necessary. */
296 fputs_filtered ("\"", stream
);
298 if (force_ellipses
|| i
< length
)
299 fputs_filtered ("...", stream
);
302 /* See language.h. */
305 m2_language::emitchar (int ch
, struct type
*chtype
,
306 struct ui_file
*stream
, int quoter
) const
308 ch
&= 0xFF; /* Avoid sign bit follies. */
310 if (PRINT_LITERAL_FORM (ch
))
312 if (ch
== '\\' || ch
== quoter
)
313 fputs_filtered ("\\", stream
);
314 fprintf_filtered (stream
, "%c", ch
);
321 fputs_filtered ("\\n", stream
);
324 fputs_filtered ("\\b", stream
);
327 fputs_filtered ("\\t", stream
);
330 fputs_filtered ("\\f", stream
);
333 fputs_filtered ("\\r", stream
);
336 fputs_filtered ("\\e", stream
);
339 fputs_filtered ("\\a", stream
);
342 fprintf_filtered (stream
, "\\%.3o", (unsigned int) ch
);
348 /* Called during architecture gdbarch initialisation to create language
352 build_m2_types (struct gdbarch
*gdbarch
)
354 struct builtin_m2_type
*builtin_m2_type
355 = GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct builtin_m2_type
);
357 /* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
358 builtin_m2_type
->builtin_int
359 = arch_integer_type (gdbarch
, gdbarch_int_bit (gdbarch
), 0, "INTEGER");
360 builtin_m2_type
->builtin_card
361 = arch_integer_type (gdbarch
, gdbarch_int_bit (gdbarch
), 1, "CARDINAL");
362 builtin_m2_type
->builtin_real
363 = arch_float_type (gdbarch
, gdbarch_float_bit (gdbarch
), "REAL",
364 gdbarch_float_format (gdbarch
));
365 builtin_m2_type
->builtin_char
366 = arch_character_type (gdbarch
, TARGET_CHAR_BIT
, 1, "CHAR");
367 builtin_m2_type
->builtin_bool
368 = arch_boolean_type (gdbarch
, gdbarch_int_bit (gdbarch
), 1, "BOOLEAN");
370 return builtin_m2_type
;
373 static struct gdbarch_data
*m2_type_data
;
375 const struct builtin_m2_type
*
376 builtin_m2_type (struct gdbarch
*gdbarch
)
378 return (const struct builtin_m2_type
*) gdbarch_data (gdbarch
, m2_type_data
);
382 /* Initialization for Modula-2 */
384 void _initialize_m2_language ();
386 _initialize_m2_language ()
388 m2_type_data
= gdbarch_data_register_post_init (build_m2_types
);