1 /* Scheme/Guile language support routines for GDB, the GNU debugger.
2 Copyright 1995 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, Boston, MA 02111-1307, USA. */
23 #include "expression.h"
24 #include "parser-defs.h"
31 extern struct type
** const (c_builtin_types
[]);
32 extern value_ptr value_allocate_space_in_inferior
PARAMS ((int));
33 extern value_ptr find_function_in_inferior
PARAMS ((char*));
35 struct type
*builtin_type_scm
;
38 scm_printchar (c
, stream
)
42 fprintf_filtered (stream
, "#\\%c", c
);
46 scm_printstr (stream
, string
, length
, force_ellipses
)
52 fprintf_filtered (stream
, "\"%s\"", string
);
56 is_scmvalue_type (type
)
59 if (TYPE_CODE (type
) == TYPE_CODE_INT
60 && TYPE_NAME (type
) && strcmp (TYPE_NAME (type
), "SCM") == 0)
67 /* Get the INDEX'th SCM value, assuming SVALUE is the address
71 scm_get_field (svalue
, index
)
77 read_memory (SCM2PTR (svalue
) + index
* TYPE_LENGTH (builtin_type_scm
),
78 buffer
, TYPE_LENGTH (builtin_type_scm
));
79 return extract_signed_integer (buffer
, TYPE_LENGTH (builtin_type_scm
));
82 /* Unpack a value of type TYPE in buffer VALADDR as an integer
83 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR),
84 or Boolean (CONTEXT == TYPE_CODE_BOOL). */
87 scm_unpack (type
, valaddr
, context
)
90 enum type_code context
;
92 if (is_scmvalue_type (type
))
94 LONGEST svalue
= extract_signed_integer (valaddr
, TYPE_LENGTH (type
));
95 if (context
== TYPE_CODE_BOOL
)
97 if (svalue
== SCM_BOOL_F
)
104 case 2: case 6: /* fixnum */
106 case 4: /* other immediate value */
107 if (SCM_ICHRP (svalue
)) /* character */
108 return SCM_ICHR (svalue
);
109 else if (SCM_IFLAGP (svalue
))
122 error ("Value can't be converted to integer.");
128 return unpack_long (type
, valaddr
);
131 /* True if we're correctly in Guile's eval.c (the evaluator and apply). */
136 if (current_source_symtab
&& current_source_symtab
->filename
)
138 char *filename
= current_source_symtab
->filename
;
139 int len
= strlen (filename
);
140 if (len
>= 6 && strcmp (filename
+ len
- 6, "eval.c") == 0)
146 /* Lookup a value for the variable named STR.
147 First lookup in Scheme context (using the scm_lookup_cstr inferior
148 function), then try lookup_symbol for compiled variables. */
151 scm_lookup_name (str
)
155 int len
= strlen (str
);
156 value_ptr symval
, func
, val
;
158 args
[0] = value_allocate_space_in_inferior (len
);
159 args
[1] = value_from_longest (builtin_type_int
, len
);
160 write_memory (value_as_long (args
[0]), str
, len
);
163 && (sym
= lookup_symbol ("env",
164 expression_context_block
,
165 VAR_NAMESPACE
, (int *) NULL
,
166 (struct symtab
**) NULL
)) != NULL
)
167 args
[2] = value_of_variable (sym
, expression_context_block
);
169 /* FIXME in this case, we should try lookup_symbol first */
170 args
[2] = value_from_longest (builtin_type_scm
, SCM_EOL
);
172 func
= find_function_in_inferior ("scm_lookup_cstr");
173 val
= call_function_by_hand (func
, 3, args
);
174 if (!value_logical_not (val
))
175 return value_ind (val
);
177 sym
= lookup_symbol (str
,
178 expression_context_block
,
179 VAR_NAMESPACE
, (int *) NULL
,
180 (struct symtab
**) NULL
);
182 return value_of_variable (sym
, NULL
);
183 error ("No symbol \"%s\" in current context.");
187 scm_evaluate_string (str
, len
)
191 value_ptr addr
= value_allocate_space_in_inferior (len
+ 1);
192 LONGEST iaddr
= value_as_long (addr
);
193 write_memory (iaddr
, str
, len
);
194 /* FIXME - should find and pass env */
195 write_memory (iaddr
+ len
, "", 1);
196 func
= find_function_in_inferior ("scm_evstr");
197 return call_function_by_hand (func
, 1, &addr
);
201 evaluate_subexp_scm (expect_type
, exp
, pos
, noside
)
202 struct type
*expect_type
;
203 register struct expression
*exp
;
207 enum exp_opcode op
= exp
->elts
[*pos
].opcode
;
208 int len
, pc
; char *str
;
213 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
214 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
215 if (noside
== EVAL_SKIP
)
217 str
= &exp
->elts
[pc
+ 2].string
;
218 return scm_lookup_name (str
);
221 len
= longest_to_int (exp
->elts
[pc
+ 1].longconst
);
222 (*pos
) += 3 + BYTES_TO_EXP_ELEM (len
+ 1);
223 if (noside
== EVAL_SKIP
)
225 str
= &exp
->elts
[pc
+ 2].string
;
226 return scm_evaluate_string (str
, len
);
229 return evaluate_subexp_standard (expect_type
, exp
, pos
, noside
);
231 return value_from_longest (builtin_type_long
, (LONGEST
) 1);
234 const struct language_defn scm_language_defn
= {
235 "scheme", /* Language name */
243 scm_printchar
, /* Print a character constant */
244 scm_printstr
, /* Function to print string constant */
245 NULL
, /* Create fundamental type in this language */
246 c_print_type
, /* Print a type using appropriate syntax */
247 scm_val_print
, /* Print a value using appropriate syntax */
248 scm_value_print
, /* Print a top-level value */
249 {"", "", "", ""}, /* Binary format info */
250 {"#o%lo", "#o", "o", ""}, /* Octal format info */
251 {"%ld", "", "d", ""}, /* Decimal format info */
252 {"#x%lX", "#X", "X", ""}, /* Hex format info */
253 NULL
, /* expression operators for printing */
254 1, /* c-style arrays */
255 0, /* String lower bound */
256 &builtin_type_char
, /* Type of string elements */
261 _initialize_scheme_language ()
263 add_language (&scm_language_defn
);
264 builtin_type_scm
= init_type (TYPE_CODE_INT
,
265 TARGET_LONG_BIT
/ TARGET_CHAR_BIT
,
266 0, "SCM", (struct objfile
*) NULL
);