1/* Scheme/Guile language support routines for GDB, the GNU debugger. 2 3 Copyright 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004 Free Software 4 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 2 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, write to the Free Software 20 Foundation, Inc., 59 Temple Place - Suite 330, 21 Boston, MA 02111-1307, USA. */ 22 23#include "defs.h" 24#include "symtab.h" 25#include "gdbtypes.h" 26#include "expression.h" 27#include "parser-defs.h" 28#include "language.h" 29#include "value.h" 30#include "c-lang.h" 31#include "scm-lang.h" 32#include "scm-tags.h" 33#include "source.h" 34#include "gdb_string.h" 35#include "gdbcore.h" 36#include "infcall.h" 37 38extern void _initialize_scheme_language (void); 39static struct value *evaluate_subexp_scm (struct type *, struct expression *, 40 int *, enum noside); 41static struct value *scm_lookup_name (char *); 42static int in_eval_c (void); 43static void scm_printstr (struct ui_file * stream, char *string, 44 unsigned int length, int width, 45 int force_ellipses); 46 47extern struct type **const (c_builtin_types[]); 48 49struct type *builtin_type_scm; 50 51void 52scm_printchar (int c, struct ui_file *stream) 53{ 54 fprintf_filtered (stream, "#\\%c", c); 55} 56 57static void 58scm_printstr (struct ui_file *stream, char *string, unsigned int length, 59 int width, int force_ellipses) 60{ 61 fprintf_filtered (stream, "\"%s\"", string); 62} 63 64int 65is_scmvalue_type (struct type *type) 66{ 67 if (TYPE_CODE (type) == TYPE_CODE_INT 68 && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) 69 { 70 return 1; 71 } 72 return 0; 73} 74 75/* Get the INDEX'th SCM value, assuming SVALUE is the address 76 of the 0'th one. */ 77 78LONGEST 79scm_get_field (LONGEST svalue, int index) 80{ 81 char buffer[20]; 82 read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm), 83 buffer, TYPE_LENGTH (builtin_type_scm)); 84 return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm)); 85} 86 87/* Unpack a value of type TYPE in buffer VALADDR as an integer 88 (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), 89 or Boolean (CONTEXT == TYPE_CODE_BOOL). */ 90 91LONGEST 92scm_unpack (struct type *type, const char *valaddr, enum type_code context) 93{ 94 if (is_scmvalue_type (type)) 95 { 96 LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type)); 97 if (context == TYPE_CODE_BOOL) 98 { 99 if (svalue == SCM_BOOL_F) 100 return 0; 101 else 102 return 1; 103 } 104 switch (7 & (int) svalue) 105 { 106 case 2: 107 case 6: /* fixnum */ 108 return svalue >> 2; 109 case 4: /* other immediate value */ 110 if (SCM_ICHRP (svalue)) /* character */ 111 return SCM_ICHR (svalue); 112 else if (SCM_IFLAGP (svalue)) 113 { 114 switch ((int) svalue) 115 { 116#ifndef SICP 117 case SCM_EOL: 118#endif 119 case SCM_BOOL_F: 120 return 0; 121 case SCM_BOOL_T: 122 return 1; 123 } 124 } 125 error ("Value can't be converted to integer."); 126 default: 127 return svalue; 128 } 129 } 130 else 131 return unpack_long (type, valaddr); 132} 133 134/* True if we're correctly in Guile's eval.c (the evaluator and apply). */ 135 136static int 137in_eval_c (void) 138{ 139 struct symtab_and_line cursal = get_current_source_symtab_and_line (); 140 141 if (cursal.symtab && cursal.symtab->filename) 142 { 143 char *filename = cursal.symtab->filename; 144 int len = strlen (filename); 145 if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) 146 return 1; 147 } 148 return 0; 149} 150 151/* Lookup a value for the variable named STR. 152 First lookup in Scheme context (using the scm_lookup_cstr inferior 153 function), then try lookup_symbol for compiled variables. */ 154 155static struct value * 156scm_lookup_name (char *str) 157{ 158 struct value *args[3]; 159 int len = strlen (str); 160 struct value *func; 161 struct value *val; 162 struct symbol *sym; 163 args[0] = value_allocate_space_in_inferior (len); 164 args[1] = value_from_longest (builtin_type_int, len); 165 write_memory (value_as_long (args[0]), str, len); 166 167 if (in_eval_c () 168 && (sym = lookup_symbol ("env", 169 expression_context_block, 170 VAR_DOMAIN, (int *) NULL, 171 (struct symtab **) NULL)) != NULL) 172 args[2] = value_of_variable (sym, expression_context_block); 173 else 174 /* FIXME in this case, we should try lookup_symbol first */ 175 args[2] = value_from_longest (builtin_type_scm, SCM_EOL); 176 177 func = find_function_in_inferior ("scm_lookup_cstr"); 178 val = call_function_by_hand (func, 3, args); 179 if (!value_logical_not (val)) 180 return value_ind (val); 181 182 sym = lookup_symbol (str, 183 expression_context_block, 184 VAR_DOMAIN, (int *) NULL, 185 (struct symtab **) NULL); 186 if (sym) 187 return value_of_variable (sym, NULL); 188 error ("No symbol \"%s\" in current context.", str); 189} 190 191struct value * 192scm_evaluate_string (char *str, int len) 193{ 194 struct value *func; 195 struct value *addr = value_allocate_space_in_inferior (len + 1); 196 LONGEST iaddr = value_as_long (addr); 197 write_memory (iaddr, str, len); 198 /* FIXME - should find and pass env */ 199 write_memory (iaddr + len, "", 1); 200 func = find_function_in_inferior ("scm_evstr"); 201 return call_function_by_hand (func, 1, &addr); 202} 203 204static struct value * 205evaluate_subexp_scm (struct type *expect_type, struct expression *exp, 206 int *pos, enum noside noside) 207{ 208 enum exp_opcode op = exp->elts[*pos].opcode; 209 int len, pc; 210 char *str; 211 switch (op) 212 { 213 case OP_NAME: 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_lookup_name (str); 221 case OP_EXPRSTRING: 222 pc = (*pos)++; 223 len = longest_to_int (exp->elts[pc + 1].longconst); 224 (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); 225 if (noside == EVAL_SKIP) 226 goto nosideret; 227 str = &exp->elts[pc + 2].string; 228 return scm_evaluate_string (str, len); 229 default:; 230 } 231 return evaluate_subexp_standard (expect_type, exp, pos, noside); 232nosideret: 233 return value_from_longest (builtin_type_long, (LONGEST) 1); 234} 235 236const struct exp_descriptor exp_descriptor_scm = 237{ 238 print_subexp_standard, 239 operator_length_standard, 240 op_name_standard, 241 dump_subexp_body_standard, 242 evaluate_subexp_scm 243}; 244 245const struct language_defn scm_language_defn = 246{ 247 "scheme", /* Language name */ 248 language_scm, 249 c_builtin_types, 250 range_check_off, 251 type_check_off, 252 case_sensitive_off, 253 &exp_descriptor_scm, 254 scm_parse, 255 c_error, 256 scm_printchar, /* Print a character constant */ 257 scm_printstr, /* Function to print string constant */ 258 NULL, /* Function to print a single character */ 259 NULL, /* Create fundamental type in this language */ 260 c_print_type, /* Print a type using appropriate syntax */ 261 scm_val_print, /* Print a value using appropriate syntax */ 262 scm_value_print, /* Print a top-level value */ 263 NULL, /* Language specific skip_trampoline */ 264 value_of_this, /* value_of_this */ 265 basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ 266 basic_lookup_transparent_type,/* lookup_transparent_type */ 267 NULL, /* Language specific symbol demangler */ 268 {"", "", "", ""}, /* Binary format info */ 269 {"#o%lo", "#o", "o", ""}, /* Octal format info */ 270 {"%ld", "", "d", ""}, /* Decimal format info */ 271 {"#x%lX", "#X", "X", ""}, /* Hex format info */ 272 NULL, /* expression operators for printing */ 273 1, /* c-style arrays */ 274 0, /* String lower bound */ 275 &builtin_type_char, /* Type of string elements */ 276 default_word_break_characters, 277 LANG_MAGIC 278}; 279 280void 281_initialize_scheme_language (void) 282{ 283 add_language (&scm_language_defn); 284 builtin_type_scm = init_type (TYPE_CODE_INT, 285 TARGET_LONG_BIT / TARGET_CHAR_BIT, 286 0, "SCM", (struct objfile *) NULL); 287} 288