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"
33 evaluate_subexp_modula2 (struct type
*expect_type
, struct expression
*exp
,
34 int *pos
, enum noside noside
)
36 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
45 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
47 if (noside
== EVAL_SKIP
|| noside
== EVAL_AVOID_SIDE_EFFECTS
)
51 arg1
= coerce_ref (arg1
);
52 type
= check_typedef (value_type (arg1
));
54 if (m2_is_unbounded_array (type
))
56 struct value
*temp
= arg1
;
58 type
= type
->field (1).type ();
59 /* i18n: Do not translate the "_m2_high" part! */
60 arg1
= value_struct_elt (&temp
, NULL
, "_m2_high", NULL
,
61 _("unbounded structure "
62 "missing _m2_high field"));
64 if (value_type (arg1
) != type
)
65 arg1
= value_cast (type
, arg1
);
72 arg1
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
73 arg2
= evaluate_subexp_with_coercion (exp
, pos
, noside
);
74 if (noside
== EVAL_SKIP
)
76 /* If the user attempts to subscript something that is not an
77 array or pointer type (like a plain int variable for example),
78 then report this as an error. */
80 arg1
= coerce_ref (arg1
);
81 type
= check_typedef (value_type (arg1
));
83 if (m2_is_unbounded_array (type
))
85 struct value
*temp
= arg1
;
86 type
= type
->field (0).type ();
87 if (type
== NULL
|| (type
->code () != TYPE_CODE_PTR
))
89 warning (_("internal error: unbounded "
90 "array structure is unknown"));
91 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
93 /* i18n: Do not translate the "_m2_contents" part! */
94 arg1
= value_struct_elt (&temp
, NULL
, "_m2_contents", NULL
,
95 _("unbounded structure "
96 "missing _m2_contents field"));
98 if (value_type (arg1
) != type
)
99 arg1
= value_cast (type
, arg1
);
101 check_typedef (value_type (arg1
));
102 return value_ind (value_ptradd (arg1
, value_as_long (arg2
)));
105 if (type
->code () != TYPE_CODE_ARRAY
)
108 error (_("cannot subscript something of type `%s'"),
111 error (_("cannot subscript requested type"));
114 if (noside
== EVAL_AVOID_SIDE_EFFECTS
)
115 return value_zero (TYPE_TARGET_TYPE (type
), VALUE_LVAL (arg1
));
117 return value_subscript (arg1
, value_as_long (arg2
));
120 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
124 return value_from_longest (builtin_type (exp
->gdbarch
)->builtin_int
, 1);
128 /* Table of operators and their precedences for printing expressions. */
130 const struct op_print
m2_language::op_print_tab
[] =
132 {"+", BINOP_ADD
, PREC_ADD
, 0},
133 {"+", UNOP_PLUS
, PREC_PREFIX
, 0},
134 {"-", BINOP_SUB
, PREC_ADD
, 0},
135 {"-", UNOP_NEG
, PREC_PREFIX
, 0},
136 {"*", BINOP_MUL
, PREC_MUL
, 0},
137 {"/", BINOP_DIV
, PREC_MUL
, 0},
138 {"DIV", BINOP_INTDIV
, PREC_MUL
, 0},
139 {"MOD", BINOP_REM
, PREC_MUL
, 0},
140 {":=", BINOP_ASSIGN
, PREC_ASSIGN
, 1},
141 {"OR", BINOP_LOGICAL_OR
, PREC_LOGICAL_OR
, 0},
142 {"AND", BINOP_LOGICAL_AND
, PREC_LOGICAL_AND
, 0},
143 {"NOT", UNOP_LOGICAL_NOT
, PREC_PREFIX
, 0},
144 {"=", BINOP_EQUAL
, PREC_EQUAL
, 0},
145 {"<>", BINOP_NOTEQUAL
, PREC_EQUAL
, 0},
146 {"<=", BINOP_LEQ
, PREC_ORDER
, 0},
147 {">=", BINOP_GEQ
, PREC_ORDER
, 0},
148 {">", BINOP_GTR
, PREC_ORDER
, 0},
149 {"<", BINOP_LESS
, PREC_ORDER
, 0},
150 {"^", UNOP_IND
, PREC_PREFIX
, 0},
151 {"@", BINOP_REPEAT
, PREC_REPEAT
, 0},
152 {"CAP", UNOP_CAP
, PREC_BUILTIN_FUNCTION
, 0},
153 {"CHR", UNOP_CHR
, PREC_BUILTIN_FUNCTION
, 0},
154 {"ORD", UNOP_ORD
, PREC_BUILTIN_FUNCTION
, 0},
155 {"FLOAT", UNOP_FLOAT
, PREC_BUILTIN_FUNCTION
, 0},
156 {"HIGH", UNOP_HIGH
, PREC_BUILTIN_FUNCTION
, 0},
157 {"MAX", UNOP_MAX
, PREC_BUILTIN_FUNCTION
, 0},
158 {"MIN", UNOP_MIN
, PREC_BUILTIN_FUNCTION
, 0},
159 {"ODD", UNOP_ODD
, PREC_BUILTIN_FUNCTION
, 0},
160 {"TRUNC", UNOP_TRUNC
, PREC_BUILTIN_FUNCTION
, 0},
161 {NULL
, OP_NULL
, PREC_BUILTIN_FUNCTION
, 0}
165 const struct exp_descriptor
m2_language::exp_descriptor_modula2
=
167 print_subexp_standard
,
168 operator_length_standard
,
169 operator_check_standard
,
171 dump_subexp_body_standard
,
172 evaluate_subexp_modula2
175 /* Single instance of the M2 language. */
177 static m2_language m2_language_defn
;
179 /* See language.h. */
182 m2_language::language_arch_info (struct gdbarch
*gdbarch
,
183 struct language_arch_info
*lai
) const
185 const struct builtin_m2_type
*builtin
= builtin_m2_type (gdbarch
);
187 /* Helper function to allow shorter lines below. */
188 auto add
= [&] (struct type
* t
)
190 lai
->add_primitive_type (t
);
193 add (builtin
->builtin_char
);
194 add (builtin
->builtin_int
);
195 add (builtin
->builtin_card
);
196 add (builtin
->builtin_real
);
197 add (builtin
->builtin_bool
);
199 lai
->set_string_char_type (builtin
->builtin_char
);
200 lai
->set_bool_type (builtin
->builtin_bool
, "BOOLEAN");
206 m2_language::printchar (int c
, struct type
*type
,
207 struct ui_file
*stream
) const
209 fputs_filtered ("'", stream
);
210 emitchar (c
, type
, stream
, '\'');
211 fputs_filtered ("'", stream
);
214 /* See language.h. */
217 m2_language::printstr (struct ui_file
*stream
, struct type
*elttype
,
218 const gdb_byte
*string
, unsigned int length
,
219 const char *encoding
, int force_ellipses
,
220 const struct value_print_options
*options
) const
223 unsigned int things_printed
= 0;
229 fputs_filtered ("\"\"", gdb_stdout
);
233 for (i
= 0; i
< length
&& things_printed
< options
->print_max
; ++i
)
235 /* Position of the character we are examining
236 to see whether it is repeated. */
238 /* Number of repetitions we have detected so far. */
245 fputs_filtered (", ", stream
);
251 while (rep1
< length
&& string
[rep1
] == string
[i
])
257 if (reps
> options
->repeat_count_threshold
)
261 fputs_filtered ("\", ", stream
);
264 printchar (string
[i
], elttype
, stream
);
265 fprintf_filtered (stream
, " <repeats %u times>", reps
);
267 things_printed
+= options
->repeat_count_threshold
;
274 fputs_filtered ("\"", stream
);
277 emitchar (string
[i
], elttype
, stream
, '"');
282 /* Terminate the quotes if necessary. */
284 fputs_filtered ("\"", stream
);
286 if (force_ellipses
|| i
< length
)
287 fputs_filtered ("...", stream
);
290 /* See language.h. */
293 m2_language::emitchar (int ch
, struct type
*chtype
,
294 struct ui_file
*stream
, int quoter
) const
296 ch
&= 0xFF; /* Avoid sign bit follies. */
298 if (PRINT_LITERAL_FORM (ch
))
300 if (ch
== '\\' || ch
== quoter
)
301 fputs_filtered ("\\", stream
);
302 fprintf_filtered (stream
, "%c", ch
);
309 fputs_filtered ("\\n", stream
);
312 fputs_filtered ("\\b", stream
);
315 fputs_filtered ("\\t", stream
);
318 fputs_filtered ("\\f", stream
);
321 fputs_filtered ("\\r", stream
);
324 fputs_filtered ("\\e", stream
);
327 fputs_filtered ("\\a", stream
);
330 fprintf_filtered (stream
, "\\%.3o", (unsigned int) ch
);
336 /* Called during architecture gdbarch initialisation to create language
340 build_m2_types (struct gdbarch
*gdbarch
)
342 struct builtin_m2_type
*builtin_m2_type
343 = GDBARCH_OBSTACK_ZALLOC (gdbarch
, struct builtin_m2_type
);
345 /* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
346 builtin_m2_type
->builtin_int
347 = arch_integer_type (gdbarch
, gdbarch_int_bit (gdbarch
), 0, "INTEGER");
348 builtin_m2_type
->builtin_card
349 = arch_integer_type (gdbarch
, gdbarch_int_bit (gdbarch
), 1, "CARDINAL");
350 builtin_m2_type
->builtin_real
351 = arch_float_type (gdbarch
, gdbarch_float_bit (gdbarch
), "REAL",
352 gdbarch_float_format (gdbarch
));
353 builtin_m2_type
->builtin_char
354 = arch_character_type (gdbarch
, TARGET_CHAR_BIT
, 1, "CHAR");
355 builtin_m2_type
->builtin_bool
356 = arch_boolean_type (gdbarch
, gdbarch_int_bit (gdbarch
), 1, "BOOLEAN");
358 return builtin_m2_type
;
361 static struct gdbarch_data
*m2_type_data
;
363 const struct builtin_m2_type
*
364 builtin_m2_type (struct gdbarch
*gdbarch
)
366 return (const struct builtin_m2_type
*) gdbarch_data (gdbarch
, m2_type_data
);
370 /* Initialization for Modula-2 */
372 void _initialize_m2_language ();
374 _initialize_m2_language ()
376 m2_type_data
= gdbarch_data_register_post_init (build_m2_types
);