1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
2 Copyright 1995, 1996, 1998, 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 (void);
35 static value_ptr
evaluate_subexp_scm (struct type
*, struct expression
*,
37 static value_ptr
scm_lookup_name (char *);
38 static int in_eval_c (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 (int c
, struct ui_file
*stream
)
50 fprintf_filtered (stream
, "#\\%c", c
);
54 scm_printstr (struct ui_file
*stream
, char *string
, unsigned int length
,
55 int width
, int force_ellipses
)
57 fprintf_filtered (stream
, "\"%s\"", string
);
61 is_scmvalue_type (struct type
*type
)
63 if (TYPE_CODE (type
) == TYPE_CODE_INT
64 && TYPE_NAME (type
) && strcmp (TYPE_NAME (type
), "SCM") == 0)
71 /* Get the INDEX'th SCM value, assuming SVALUE is the address
75 scm_get_field (LONGEST svalue
, int index
)
78 read_memory (SCM2PTR (svalue
) + index
* TYPE_LENGTH (builtin_type_scm
),
79 buffer
, TYPE_LENGTH (builtin_type_scm
));
80 return extract_signed_integer (buffer
, TYPE_LENGTH (builtin_type_scm
));
83 /* Unpack a value of type TYPE in buffer VALADDR as an integer
84 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
85 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
88 scm_unpack (struct type
*type
, char *valaddr
, enum type_code context
)
90 if (is_scmvalue_type (type
))
92 LONGEST svalue
= extract_signed_integer (valaddr
, TYPE_LENGTH (type
));
93 if (context
== TYPE_CODE_BOOL
)
95 if (svalue
== SCM_BOOL_F
)
100 switch (7 & (int) svalue
)
105 case 4: /* other immediate value */
106 if (SCM_ICHRP (svalue
)) /* character */
107 return SCM_ICHR (svalue
);
108 else if (SCM_IFLAGP (svalue
))
110 switch ((int) svalue
)
121 error ("Value can't be converted to integer.");
127 return unpack_long (type
, valaddr
);
130 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
135 if (current_source_symtab
&& current_source_symtab
->filename
)
137 char *filename
= current_source_symtab
->filename
;
138 int len
= strlen (filename
);
139 if (len
>= 6 && strcmp (filename
+ len
- 6, "eval.c") == 0)
145 /* Lookup a value for the variable named STR.
146 First lookup in Scheme context (using the scm_lookup_cstr inferior
147 function), then try lookup_symbol for compiled variables. */
150 scm_lookup_name (char *str
)
153 int len
= strlen (str
);
156 args
[0] = value_allocate_space_in_inferior (len
);
157 args
[1] = value_from_longest (builtin_type_int
, len
);
158 write_memory (value_as_long (args
[0]), str
, len
);
161 && (sym
= lookup_symbol ("env",
162 expression_context_block
,
163 VAR_NAMESPACE
, (int *) NULL
,
164 (struct symtab
**) NULL
)) != NULL
)
165 args
[2] = value_of_variable (sym
, expression_context_block
);
167 /* FIXME in this case, we should try lookup_symbol first */
168 args
[2] = value_from_longest (builtin_type_scm
, SCM_EOL
);
170 func
= find_function_in_inferior ("scm_lookup_cstr");
171 val
= call_function_by_hand (func
, 3, args
);
172 if (!value_logical_not (val
))
173 return value_ind (val
);
175 sym
= lookup_symbol (str
,
176 expression_context_block
,
177 VAR_NAMESPACE
, (int *) NULL
,
178 (struct symtab
**) NULL
);
180 return value_of_variable (sym
, NULL
);
181 error ("No symbol \"%s\" in current context.");
185 scm_evaluate_string (char *str
, int len
)
188 value_ptr addr
= value_allocate_space_in_inferior (len
+ 1);
189 LONGEST iaddr
= value_as_long (addr
);
190 write_memory (iaddr
, str
, len
);
191 /* FIXME - should find and pass env */
192 write_memory (iaddr
+ len
, "", 1);
193 func
= find_function_in_inferior ("scm_evstr");
194 return call_function_by_hand (func
, 1, &addr
);
198 evaluate_subexp_scm (struct type
*expect_type
, register struct expression
*exp
,
199 register int *pos
, enum noside noside
)
201 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
208 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
209 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
210 if (noside
== EVAL_SKIP
)
212 str
= &exp
->elts
[pc
+ 2].string
;
213 return scm_lookup_name (str
);
216 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
217 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
218 if (noside
== EVAL_SKIP
)
220 str
= &exp
->elts
[pc
+ 2].string
;
221 return scm_evaluate_string (str
, len
);
224 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
226 return value_from_longest (builtin_type_long
, (LONGEST
) 1);
229 const struct language_defn scm_language_defn
=
231 "scheme", /* Language name */
240 scm_printchar
, /* Print a character constant */
241 scm_printstr
, /* Function to print string constant */
242 NULL
, /* Function to print a single character */
243 NULL
, /* Create fundamental type in this language */
244 c_print_type
, /* Print a type using appropriate syntax */
245 scm_val_print
, /* Print a value using appropriate syntax */
246 scm_value_print
, /* Print a top-level value */
247 {"", "", "", ""}, /* Binary format info */
248 {"#o%lo", "#o", "o", ""}, /* Octal format info */
249 {"%ld", "", "d", ""}, /* Decimal format info */
250 {"#x%lX", "#X", "X", ""}, /* Hex format info */
251 NULL
, /* expression operators for printing */
252 1, /* c-style arrays */
253 0, /* String lower bound */
254 &builtin_type_char
, /* Type of string elements */
259 _initialize_scheme_language (void)
261 add_language (&scm_language_defn
);
262 builtin_type_scm
= init_type (TYPE_CODE_INT
,
263 TARGET_LONG_BIT
/ TARGET_CHAR_BIT
,
264 0, "SCM", (struct objfile
*) NULL
);