| 1 | /* Scheme/Guile language support routines for GDB, the GNU debugger. |
| 2 | |
| 3 | Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2007 Free |
| 4 | Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 7 | |
| 8 | This program is free software; you can redistribute it and/or modify |
| 9 | it under the terms of the GNU General Public License as published by |
| 10 | the Free Software Foundation; either version 3 of the License, or |
| 11 | (at your option) any later version. |
| 12 | |
| 13 | This program is distributed in the hope that it will be useful, |
| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 | GNU General Public License for more details. |
| 17 | |
| 18 | You should have received a copy of the GNU General Public License |
| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 | |
| 21 | #include "defs.h" |
| 22 | #include "symtab.h" |
| 23 | #include "gdbtypes.h" |
| 24 | #include "expression.h" |
| 25 | #include "parser-defs.h" |
| 26 | #include "language.h" |
| 27 | #include "value.h" |
| 28 | #include "c-lang.h" |
| 29 | #include "scm-lang.h" |
| 30 | #include "scm-tags.h" |
| 31 | #include "source.h" |
| 32 | #include "gdb_string.h" |
| 33 | #include "gdbcore.h" |
| 34 | #include "infcall.h" |
| 35 | |
| 36 | extern void _initialize_scheme_language (void); |
| 37 | static struct value *evaluate_subexp_scm (struct type *, struct expression *, |
| 38 | int *, enum noside); |
| 39 | static struct value *scm_lookup_name (char *); |
| 40 | static int in_eval_c (void); |
| 41 | |
| 42 | struct type *builtin_type_scm; |
| 43 | |
| 44 | void |
| 45 | scm_printchar (int c, struct ui_file *stream) |
| 46 | { |
| 47 | fprintf_filtered (stream, "#\\%c", c); |
| 48 | } |
| 49 | |
| 50 | static void |
| 51 | scm_printstr (struct ui_file *stream, const gdb_byte *string, |
| 52 | unsigned int length, int width, int force_ellipses) |
| 53 | { |
| 54 | fprintf_filtered (stream, "\"%s\"", string); |
| 55 | } |
| 56 | |
| 57 | int |
| 58 | is_scmvalue_type (struct type *type) |
| 59 | { |
| 60 | if (TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) |
| 61 | { |
| 62 | return 1; |
| 63 | } |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | /* Get the INDEX'th SCM value, assuming SVALUE is the address |
| 68 | of the 0'th one. */ |
| 69 | |
| 70 | LONGEST |
| 71 | scm_get_field (LONGEST svalue, int index) |
| 72 | { |
| 73 | gdb_byte buffer[20]; |
| 74 | read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm), |
| 75 | buffer, TYPE_LENGTH (builtin_type_scm)); |
| 76 | return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm)); |
| 77 | } |
| 78 | |
| 79 | /* Unpack a value of type TYPE in buffer VALADDR as an integer |
| 80 | (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), |
| 81 | or Boolean (CONTEXT == TYPE_CODE_BOOL). */ |
| 82 | |
| 83 | LONGEST |
| 84 | scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context) |
| 85 | { |
| 86 | if (is_scmvalue_type (type)) |
| 87 | { |
| 88 | LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type)); |
| 89 | if (context == TYPE_CODE_BOOL) |
| 90 | { |
| 91 | if (svalue == SCM_BOOL_F) |
| 92 | return 0; |
| 93 | else |
| 94 | return 1; |
| 95 | } |
| 96 | switch (7 & (int) svalue) |
| 97 | { |
| 98 | case 2: |
| 99 | case 6: /* fixnum */ |
| 100 | return svalue >> 2; |
| 101 | case 4: /* other immediate value */ |
| 102 | if (SCM_ICHRP (svalue)) /* character */ |
| 103 | return SCM_ICHR (svalue); |
| 104 | else if (SCM_IFLAGP (svalue)) |
| 105 | { |
| 106 | switch ((int) svalue) |
| 107 | { |
| 108 | #ifndef SICP |
| 109 | case SCM_EOL: |
| 110 | #endif |
| 111 | case SCM_BOOL_F: |
| 112 | return 0; |
| 113 | case SCM_BOOL_T: |
| 114 | return 1; |
| 115 | } |
| 116 | } |
| 117 | error (_("Value can't be converted to integer.")); |
| 118 | default: |
| 119 | return svalue; |
| 120 | } |
| 121 | } |
| 122 | else |
| 123 | return unpack_long (type, valaddr); |
| 124 | } |
| 125 | |
| 126 | /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ |
| 127 | |
| 128 | static int |
| 129 | in_eval_c (void) |
| 130 | { |
| 131 | struct symtab_and_line cursal = get_current_source_symtab_and_line (); |
| 132 | |
| 133 | if (cursal.symtab && cursal.symtab->filename) |
| 134 | { |
| 135 | char *filename = cursal.symtab->filename; |
| 136 | int len = strlen (filename); |
| 137 | if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) |
| 138 | return 1; |
| 139 | } |
| 140 | return 0; |
| 141 | } |
| 142 | |
| 143 | /* Lookup a value for the variable named STR. |
| 144 | First lookup in Scheme context (using the scm_lookup_cstr inferior |
| 145 | function), then try lookup_symbol for compiled variables. */ |
| 146 | |
| 147 | static struct value * |
| 148 | scm_lookup_name (char *str) |
| 149 | { |
| 150 | struct value *args[3]; |
| 151 | int len = strlen (str); |
| 152 | struct value *func; |
| 153 | struct value *val; |
| 154 | struct symbol *sym; |
| 155 | args[0] = value_allocate_space_in_inferior (len); |
| 156 | args[1] = value_from_longest (builtin_type_int, len); |
| 157 | write_memory (value_as_long (args[0]), (gdb_byte *) str, len); |
| 158 | |
| 159 | if (in_eval_c () |
| 160 | && (sym = lookup_symbol ("env", |
| 161 | expression_context_block, |
| 162 | VAR_DOMAIN, (int *) NULL, |
| 163 | (struct symtab **) NULL)) != NULL) |
| 164 | args[2] = value_of_variable (sym, expression_context_block); |
| 165 | else |
| 166 | /* FIXME in this case, we should try lookup_symbol first */ |
| 167 | args[2] = value_from_longest (builtin_type_scm, SCM_EOL); |
| 168 | |
| 169 | func = find_function_in_inferior ("scm_lookup_cstr"); |
| 170 | val = call_function_by_hand (func, 3, args); |
| 171 | if (!value_logical_not (val)) |
| 172 | return value_ind (val); |
| 173 | |
| 174 | sym = lookup_symbol (str, |
| 175 | expression_context_block, |
| 176 | VAR_DOMAIN, (int *) NULL, |
| 177 | (struct symtab **) NULL); |
| 178 | if (sym) |
| 179 | return value_of_variable (sym, NULL); |
| 180 | error (_("No symbol \"%s\" in current context."), str); |
| 181 | } |
| 182 | |
| 183 | struct value * |
| 184 | scm_evaluate_string (char *str, int len) |
| 185 | { |
| 186 | struct value *func; |
| 187 | struct value *addr = value_allocate_space_in_inferior (len + 1); |
| 188 | LONGEST iaddr = value_as_long (addr); |
| 189 | write_memory (iaddr, (gdb_byte *) str, len); |
| 190 | /* FIXME - should find and pass env */ |
| 191 | write_memory (iaddr + len, (gdb_byte *) "", 1); |
| 192 | func = find_function_in_inferior ("scm_evstr"); |
| 193 | return call_function_by_hand (func, 1, &addr); |
| 194 | } |
| 195 | |
| 196 | static struct value * |
| 197 | evaluate_exp (struct type *expect_type, struct expression *exp, |
| 198 | int *pos, enum noside noside) |
| 199 | { |
| 200 | enum exp_opcode op = exp->elts[*pos].opcode; |
| 201 | int len, pc; |
| 202 | char *str; |
| 203 | switch (op) |
| 204 | { |
| 205 | case OP_NAME: |
| 206 | pc = (*pos)++; |
| 207 | len = longest_to_int (exp->elts[pc + 1].longconst); |
| 208 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); |
| 209 | if (noside == EVAL_SKIP) |
| 210 | goto nosideret; |
| 211 | str = &exp->elts[pc + 2].string; |
| 212 | return scm_lookup_name (str); |
| 213 | case OP_STRING: |
| 214 | pc = (*pos)++; |
| 215 | len = longest_to_int (exp->elts[pc + 1].longconst); |
| 216 | (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); |
| 217 | if (noside == EVAL_SKIP) |
| 218 | goto nosideret; |
| 219 | str = &exp->elts[pc + 2].string; |
| 220 | return scm_evaluate_string (str, len); |
| 221 | default:; |
| 222 | } |
| 223 | return evaluate_subexp_standard (expect_type, exp, pos, noside); |
| 224 | nosideret: |
| 225 | return value_from_longest (builtin_type_long, (LONGEST) 1); |
| 226 | } |
| 227 | |
| 228 | const struct exp_descriptor exp_descriptor_scm = |
| 229 | { |
| 230 | print_subexp_standard, |
| 231 | operator_length_standard, |
| 232 | op_name_standard, |
| 233 | dump_subexp_body_standard, |
| 234 | evaluate_exp |
| 235 | }; |
| 236 | |
| 237 | const struct language_defn scm_language_defn = |
| 238 | { |
| 239 | "scheme", /* Language name */ |
| 240 | language_scm, |
| 241 | NULL, |
| 242 | range_check_off, |
| 243 | type_check_off, |
| 244 | case_sensitive_off, |
| 245 | array_row_major, |
| 246 | &exp_descriptor_scm, |
| 247 | scm_parse, |
| 248 | c_error, |
| 249 | null_post_parser, |
| 250 | scm_printchar, /* Print a character constant */ |
| 251 | scm_printstr, /* Function to print string constant */ |
| 252 | NULL, /* Function to print a single character */ |
| 253 | NULL, /* Create fundamental type in this language */ |
| 254 | c_print_type, /* Print a type using appropriate syntax */ |
| 255 | scm_val_print, /* Print a value using appropriate syntax */ |
| 256 | scm_value_print, /* Print a top-level value */ |
| 257 | NULL, /* Language specific skip_trampoline */ |
| 258 | value_of_this, /* value_of_this */ |
| 259 | basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ |
| 260 | basic_lookup_transparent_type,/* lookup_transparent_type */ |
| 261 | NULL, /* Language specific symbol demangler */ |
| 262 | NULL, /* Language specific class_name_from_physname */ |
| 263 | NULL, /* expression operators for printing */ |
| 264 | 1, /* c-style arrays */ |
| 265 | 0, /* String lower bound */ |
| 266 | NULL, |
| 267 | default_word_break_characters, |
| 268 | c_language_arch_info, |
| 269 | default_print_array_index, |
| 270 | LANG_MAGIC |
| 271 | }; |
| 272 | |
| 273 | void |
| 274 | _initialize_scheme_language (void) |
| 275 | { |
| 276 | add_language (&scm_language_defn); |
| 277 | builtin_type_scm = |
| 278 | init_type (TYPE_CODE_INT, |
| 279 | gdbarch_long_bit (current_gdbarch) / TARGET_CHAR_BIT, |
| 280 | 0, "SCM", (struct objfile *) NULL); |
| 281 | } |