1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
2 Copyright 1995, 2000 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
24 #include "expression.h"
25 #include "parser-defs.h"
31 #include "gdb_string.h"
34 extern void _initialize_scheme_language
PARAMS ((void));
35 static value_ptr evaluate_subexp_scm
PARAMS ((struct type
*, struct expression
*,
37 static value_ptr scm_lookup_name
PARAMS ((char *));
38 static int in_eval_c
PARAMS ((void));
39 static void scm_printstr (struct ui_file
* stream
, char *string
,
40 unsigned int length
, int width
,
43 extern struct type
**CONST_PTR (c_builtin_types
[]);
45 struct type
*builtin_type_scm
;
48 scm_printchar (c
, stream
)
50 struct ui_file
*stream
;
52 fprintf_filtered (stream
, "#\\%c", c
);
56 scm_printstr (stream
, string
, length
, width
, force_ellipses
)
57 struct ui_file
*stream
;
63 fprintf_filtered (stream
, "\"%s\"", string
);
67 is_scmvalue_type (type
)
70 if (TYPE_CODE (type
) == TYPE_CODE_INT
71 && TYPE_NAME (type
) && strcmp (TYPE_NAME (type
), "SCM") == 0)
78 /* Get the INDEX'th SCM value, assuming SVALUE is the address
82 scm_get_field (svalue
, index
)
87 read_memory (SCM2PTR (svalue
) + index
* TYPE_LENGTH (builtin_type_scm
),
88 buffer
, TYPE_LENGTH (builtin_type_scm
));
89 return extract_signed_integer (buffer
, TYPE_LENGTH (builtin_type_scm
));
92 /* Unpack a value of type TYPE in buffer VALADDR as an integer
93 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
94 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
97 scm_unpack (type
, valaddr
, context
)
100 enum type_code context
;
102 if (is_scmvalue_type (type
))
104 LONGEST svalue
= extract_signed_integer (valaddr
, TYPE_LENGTH (type
));
105 if (context
== TYPE_CODE_BOOL
)
107 if (svalue
== SCM_BOOL_F
)
112 switch (7 & (int) svalue
)
117 case 4: /* other immediate value */
118 if (SCM_ICHRP (svalue
)) /* character */
119 return SCM_ICHR (svalue
);
120 else if (SCM_IFLAGP (svalue
))
122 switch ((int) svalue
)
133 error ("Value can't be converted to integer.");
139 return unpack_long (type
, valaddr
);
142 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
147 if (current_source_symtab
&& current_source_symtab
->filename
)
149 char *filename
= current_source_symtab
->filename
;
150 int len
= strlen (filename
);
151 if (len
>= 6 && strcmp (filename
+ len
- 6, "eval.c") == 0)
157 /* Lookup a value for the variable named STR.
158 First lookup in Scheme context (using the scm_lookup_cstr inferior
159 function), then try lookup_symbol for compiled variables. */
162 scm_lookup_name (str
)
166 int len
= strlen (str
);
169 args
[0] = value_allocate_space_in_inferior (len
);
170 args
[1] = value_from_longest (builtin_type_int
, len
);
171 write_memory (value_as_long (args
[0]), str
, len
);
174 && (sym
= lookup_symbol ("env",
175 expression_context_block
,
176 VAR_NAMESPACE
, (int *) NULL
,
177 (struct symtab
**) NULL
)) != NULL
)
178 args
[2] = value_of_variable (sym
, expression_context_block
);
180 /* FIXME in this case, we should try lookup_symbol first */
181 args
[2] = value_from_longest (builtin_type_scm
, SCM_EOL
);
183 func
= find_function_in_inferior ("scm_lookup_cstr");
184 val
= call_function_by_hand (func
, 3, args
);
185 if (!value_logical_not (val
))
186 return value_ind (val
);
188 sym
= lookup_symbol (str
,
189 expression_context_block
,
190 VAR_NAMESPACE
, (int *) NULL
,
191 (struct symtab
**) NULL
);
193 return value_of_variable (sym
, NULL
);
194 error ("No symbol \"%s\" in current context.");
198 scm_evaluate_string (str
, len
)
203 value_ptr addr
= value_allocate_space_in_inferior (len
+ 1);
204 LONGEST iaddr
= value_as_long (addr
);
205 write_memory (iaddr
, str
, len
);
206 /* FIXME - should find and pass env */
207 write_memory (iaddr
+ len
, "", 1);
208 func
= find_function_in_inferior ("scm_evstr");
209 return call_function_by_hand (func
, 1, &addr
);
213 evaluate_subexp_scm (expect_type
, exp
, pos
, noside
)
214 struct type
*expect_type
;
215 register struct expression
*exp
;
219 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
226 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
227 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
228 if (noside
== EVAL_SKIP
)
230 str
= &exp
->elts
[pc
+ 2].string
;
231 return scm_lookup_name (str
);
234 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
235 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
236 if (noside
== EVAL_SKIP
)
238 str
= &exp
->elts
[pc
+ 2].string
;
239 return scm_evaluate_string (str
, len
);
242 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
244 return value_from_longest (builtin_type_long
, (LONGEST
) 1);
247 const struct language_defn scm_language_defn
=
249 "scheme", /* Language name */
257 scm_printchar
, /* Print a character constant */
258 scm_printstr
, /* Function to print string constant */
259 NULL
, /* Function to print a single character */
260 NULL
, /* Create fundamental type in this language */
261 c_print_type
, /* Print a type using appropriate syntax */
262 scm_val_print
, /* Print a value using appropriate syntax */
263 scm_value_print
, /* Print a top-level value */
264 {"", "", "", ""}, /* Binary format info */
265 {"#o%lo", "#o", "o", ""}, /* Octal format info */
266 {"%ld", "", "d", ""}, /* Decimal format info */
267 {"#x%lX", "#X", "X", ""}, /* Hex format info */
268 NULL
, /* expression operators for printing */
269 1, /* c-style arrays */
270 0, /* String lower bound */
271 &builtin_type_char
, /* Type of string elements */
276 _initialize_scheme_language ()
278 add_language (&scm_language_defn
);
279 builtin_type_scm
= init_type (TYPE_CODE_INT
,
280 TARGET_LONG_BIT
/ TARGET_CHAR_BIT
,
281 0, "SCM", (struct objfile
*) NULL
);