| /* Scheme/Guile language support routines for GDB, the GNU debugger. |
| |
| Copyright (C) 1995, 1996, 1998, 2000, 2001, 2002, 2003, 2004, 2005 Free |
| Software Foundation, Inc. |
| |
| This file is part of GDB. |
| |
| This program is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or |
| (at your option) any later version. |
| |
| This program is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| GNU General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with this program; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| Boston, MA 02110-1301, USA. */ |
| |
| #include "defs.h" |
| #include "symtab.h" |
| #include "gdbtypes.h" |
| #include "expression.h" |
| #include "parser-defs.h" |
| #include "language.h" |
| #include "value.h" |
| #include "c-lang.h" |
| #include "scm-lang.h" |
| #include "scm-tags.h" |
| #include "source.h" |
| #include "gdb_string.h" |
| #include "gdbcore.h" |
| #include "infcall.h" |
| |
| extern void _initialize_scheme_language (void); |
| static struct value *evaluate_subexp_scm (struct type *, struct expression *, |
| int *, enum noside); |
| static struct value *scm_lookup_name (char *); |
| static int in_eval_c (void); |
| |
| struct type *builtin_type_scm; |
| |
| void |
| scm_printchar (int c, struct ui_file *stream) |
| { |
| fprintf_filtered (stream, "#\\%c", c); |
| } |
| |
| static void |
| scm_printstr (struct ui_file *stream, const gdb_byte *string, |
| unsigned int length, int width, int force_ellipses) |
| { |
| fprintf_filtered (stream, "\"%s\"", string); |
| } |
| |
| int |
| is_scmvalue_type (struct type *type) |
| { |
| if (TYPE_CODE (type) == TYPE_CODE_INT |
| && TYPE_NAME (type) && strcmp (TYPE_NAME (type), "SCM") == 0) |
| { |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* Get the INDEX'th SCM value, assuming SVALUE is the address |
| of the 0'th one. */ |
| |
| LONGEST |
| scm_get_field (LONGEST svalue, int index) |
| { |
| gdb_byte buffer[20]; |
| read_memory (SCM2PTR (svalue) + index * TYPE_LENGTH (builtin_type_scm), |
| buffer, TYPE_LENGTH (builtin_type_scm)); |
| return extract_signed_integer (buffer, TYPE_LENGTH (builtin_type_scm)); |
| } |
| |
| /* Unpack a value of type TYPE in buffer VALADDR as an integer |
| (if CONTEXT == TYPE_CODE_IN), a pointer (CONTEXT == TYPE_CODE_PTR), |
| or Boolean (CONTEXT == TYPE_CODE_BOOL). */ |
| |
| LONGEST |
| scm_unpack (struct type *type, const gdb_byte *valaddr, enum type_code context) |
| { |
| if (is_scmvalue_type (type)) |
| { |
| LONGEST svalue = extract_signed_integer (valaddr, TYPE_LENGTH (type)); |
| if (context == TYPE_CODE_BOOL) |
| { |
| if (svalue == SCM_BOOL_F) |
| return 0; |
| else |
| return 1; |
| } |
| switch (7 & (int) svalue) |
| { |
| case 2: |
| case 6: /* fixnum */ |
| return svalue >> 2; |
| case 4: /* other immediate value */ |
| if (SCM_ICHRP (svalue)) /* character */ |
| return SCM_ICHR (svalue); |
| else if (SCM_IFLAGP (svalue)) |
| { |
| switch ((int) svalue) |
| { |
| #ifndef SICP |
| case SCM_EOL: |
| #endif |
| case SCM_BOOL_F: |
| return 0; |
| case SCM_BOOL_T: |
| return 1; |
| } |
| } |
| error (_("Value can't be converted to integer.")); |
| default: |
| return svalue; |
| } |
| } |
| else |
| return unpack_long (type, valaddr); |
| } |
| |
| /* True if we're correctly in Guile's eval.c (the evaluator and apply). */ |
| |
| static int |
| in_eval_c (void) |
| { |
| struct symtab_and_line cursal = get_current_source_symtab_and_line (); |
| |
| if (cursal.symtab && cursal.symtab->filename) |
| { |
| char *filename = cursal.symtab->filename; |
| int len = strlen (filename); |
| if (len >= 6 && strcmp (filename + len - 6, "eval.c") == 0) |
| return 1; |
| } |
| return 0; |
| } |
| |
| /* Lookup a value for the variable named STR. |
| First lookup in Scheme context (using the scm_lookup_cstr inferior |
| function), then try lookup_symbol for compiled variables. */ |
| |
| static struct value * |
| scm_lookup_name (char *str) |
| { |
| struct value *args[3]; |
| int len = strlen (str); |
| struct value *func; |
| struct value *val; |
| struct symbol *sym; |
| args[0] = value_allocate_space_in_inferior (len); |
| args[1] = value_from_longest (builtin_type_int, len); |
| write_memory (value_as_long (args[0]), (gdb_byte *) str, len); |
| |
| if (in_eval_c () |
| && (sym = lookup_symbol ("env", |
| expression_context_block, |
| VAR_DOMAIN, (int *) NULL, |
| (struct symtab **) NULL)) != NULL) |
| args[2] = value_of_variable (sym, expression_context_block); |
| else |
| /* FIXME in this case, we should try lookup_symbol first */ |
| args[2] = value_from_longest (builtin_type_scm, SCM_EOL); |
| |
| func = find_function_in_inferior ("scm_lookup_cstr"); |
| val = call_function_by_hand (func, 3, args); |
| if (!value_logical_not (val)) |
| return value_ind (val); |
| |
| sym = lookup_symbol (str, |
| expression_context_block, |
| VAR_DOMAIN, (int *) NULL, |
| (struct symtab **) NULL); |
| if (sym) |
| return value_of_variable (sym, NULL); |
| error (_("No symbol \"%s\" in current context."), str); |
| } |
| |
| struct value * |
| scm_evaluate_string (char *str, int len) |
| { |
| struct value *func; |
| struct value *addr = value_allocate_space_in_inferior (len + 1); |
| LONGEST iaddr = value_as_long (addr); |
| write_memory (iaddr, (gdb_byte *) str, len); |
| /* FIXME - should find and pass env */ |
| write_memory (iaddr + len, (gdb_byte *) "", 1); |
| func = find_function_in_inferior ("scm_evstr"); |
| return call_function_by_hand (func, 1, &addr); |
| } |
| |
| static struct value * |
| evaluate_subexp_scm (struct type *expect_type, struct expression *exp, |
| int *pos, enum noside noside) |
| { |
| enum exp_opcode op = exp->elts[*pos].opcode; |
| int len, pc; |
| char *str; |
| switch (op) |
| { |
| case OP_NAME: |
| pc = (*pos)++; |
| len = longest_to_int (exp->elts[pc + 1].longconst); |
| (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); |
| if (noside == EVAL_SKIP) |
| goto nosideret; |
| str = &exp->elts[pc + 2].string; |
| return scm_lookup_name (str); |
| case OP_EXPRSTRING: |
| pc = (*pos)++; |
| len = longest_to_int (exp->elts[pc + 1].longconst); |
| (*pos) += 3 + BYTES_TO_EXP_ELEM (len + 1); |
| if (noside == EVAL_SKIP) |
| goto nosideret; |
| str = &exp->elts[pc + 2].string; |
| return scm_evaluate_string (str, len); |
| default:; |
| } |
| return evaluate_subexp_standard (expect_type, exp, pos, noside); |
| nosideret: |
| return value_from_longest (builtin_type_long, (LONGEST) 1); |
| } |
| |
| const struct exp_descriptor exp_descriptor_scm = |
| { |
| print_subexp_standard, |
| operator_length_standard, |
| op_name_standard, |
| dump_subexp_body_standard, |
| evaluate_subexp_scm |
| }; |
| |
| const struct language_defn scm_language_defn = |
| { |
| "scheme", /* Language name */ |
| language_scm, |
| NULL, |
| range_check_off, |
| type_check_off, |
| case_sensitive_off, |
| array_row_major, |
| &exp_descriptor_scm, |
| scm_parse, |
| c_error, |
| null_post_parser, |
| scm_printchar, /* Print a character constant */ |
| scm_printstr, /* Function to print string constant */ |
| NULL, /* Function to print a single character */ |
| NULL, /* Create fundamental type in this language */ |
| c_print_type, /* Print a type using appropriate syntax */ |
| scm_val_print, /* Print a value using appropriate syntax */ |
| scm_value_print, /* Print a top-level value */ |
| NULL, /* Language specific skip_trampoline */ |
| value_of_this, /* value_of_this */ |
| basic_lookup_symbol_nonlocal, /* lookup_symbol_nonlocal */ |
| basic_lookup_transparent_type,/* lookup_transparent_type */ |
| NULL, /* Language specific symbol demangler */ |
| NULL, /* Language specific class_name_from_physname */ |
| NULL, /* expression operators for printing */ |
| 1, /* c-style arrays */ |
| 0, /* String lower bound */ |
| NULL, |
| default_word_break_characters, |
| c_language_arch_info, |
| default_print_array_index, |
| LANG_MAGIC |
| }; |
| |
| void |
| _initialize_scheme_language (void) |
| { |
| add_language (&scm_language_defn); |
| builtin_type_scm = init_type (TYPE_CODE_INT, |
| TARGET_LONG_BIT / TARGET_CHAR_BIT, |
| 0, "SCM", (struct objfile *) NULL); |
| } |