From c8023e66308b5b01ab1423d6a85c5aa4d3a1ab98 Mon Sep 17 00:00:00 2001 From: John Gilmore Date: Thu, 19 Sep 1991 11:43:22 +0000 Subject: [PATCH] * language.h, language.c: New files for language-specific macros, declarations, and definitions. --- gdb/language.c | 1100 ++++++++++++++++++++++++++++++++++++++++++++++++ gdb/language.h | 168 ++++++++ 2 files changed, 1268 insertions(+) create mode 100644 gdb/language.c create mode 100644 gdb/language.h diff --git a/gdb/language.c b/gdb/language.c new file mode 100644 index 00000000000..ced2f5a48a2 --- /dev/null +++ b/gdb/language.c @@ -0,0 +1,1100 @@ +/* Multiple source language support for GDB. + Copyright 1991 Free Software Foundation, Inc. + Contributed by the Department of Computer Science at the State University + of New York at Buffalo. + +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., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* This file contains functions that return things that are specific + to languages. Each function should examine current_language if necessary, + and return the appropriate result. */ + +/* FIXME: Most of these would be better organized as macros which + return data out of a "language-specific" struct pointer that is set + whenever the working language changes. That would be a lot faster. */ + +#include +#include +#include + +#include "defs.h" +#include "symtab.h" +#include "value.h" +#include "gdbcmd.h" +#include "frame.h" +#include "language.h" +#include "expression.h" +#include "target.h" +#include "parser-defs.h" + +/* Forward function declarations */ +static void set_type_range (); + +/* Forward declaration */ +extern struct language_defn unknown_language_defn; + +/* The current (default at startup) state of type and range checking. + (If the modes are set to "auto", though, these are changed based + on the default language at startup, and then again based on the + language of the first source file. */ + +enum range_mode range_mode = range_mode_auto; +enum range_check range_check = range_check_off; +enum type_mode type_mode = type_mode_auto; +enum type_check type_check = type_check_off; + +/* The current language and language_mode (see language.h) */ + +struct language_defn *current_language = &unknown_language_defn; +enum language_mode language_mode = language_mode_auto; + +/* The list of supported languages. The list itself is malloc'd. */ + +static struct language_defn **languages; +static unsigned languages_size; +static unsigned languages_allocsize; +#define DEFAULT_ALLOCSIZE 3 + +/* The "set language/type/range" commands all put stuff in these + buffers. This is to make them work as set/show commands. The + user's string is copied here, then the set_* commands look at + them and update them to something that looks nice when it is + printed out. */ + +static char *language; +static char *type; +static char *range; + +/* Warning issued when current_language and the language of the current + frame do not match. */ +char lang_frame_mismatch_warn[] = + "Warning: the current language does not match this frame."; + +void set_lang_str(); +void set_type_str(); +void set_range_str(); + +/* This page contains the functions corresponding to GDB commands + and their helpers. */ + +/* Show command. Display a warning if the language set + does not match the frame. */ +void +show_language_command (str, from_tty) + char *str; + int from_tty; +{ + enum language flang; /* The language of the current frame */ + + flang = get_frame_language(); + if (flang != language_unknown && + language_mode == language_mode_manual && + current_language->la_language != flang) + printf_filtered("%s\n",lang_frame_mismatch_warn); +} + +/* Set command. Change the current working language. */ +void +set_language_command (str, from_tty) + char *str; + int from_tty; +{ + int i; + enum language flang; + + /* FIXME -- do this from the list, with HELP. */ + if (!language || !language[0]) { + printf("The currently understood settings are:\n\n\ +local or auto Automatic setting based on source file\n\ +c or cc Always parse in C syntax\n\ +mod or m2 Always parse in Modula-2 syntax\n"); + return; + } + + /* Search the list of languages for a match. */ + for (i = 0; i < languages_size; i++) { + if (!strcmp (languages[i]->la_name, language)) { + /* Found it! Go into manual mode, and use this language. */ + if (languages[i]->la_language == language_auto) { + /* Enter auto mode. Set to the current frame's language, if known. */ + language_mode = language_mode_auto; + flang = get_frame_language(); + if (flang!=language_unknown) + set_language(flang); + return; + } else { + /* Enter manual mode. Set the specified language. */ + language_mode = language_mode_manual; + current_language = languages[i]; + set_type_range (); + set_lang_str(); + return; + } + } + } + + error ("Unknown language `%s'.",language); +} + +/* Show command. Display a warning if the type setting does + not match the current language. */ +void +show_type_command(str, from_tty) + char *str; + int from_tty; +{ + if (type_check != current_language->la_type_check) + printf( +"Warning: the current type check setting does not match the language.\n"); +} + +/* Set command. Change the setting for type checking. */ +void +set_type_command(str, from_tty) + char *str; + int from_tty; +{ + if (!strcmp(type,"on")) + { + type_check = type_check_on; + type_mode = type_mode_manual; + } + else if (!strcmp(type,"warn")) + { + type_check = type_check_warn; + type_mode = type_mode_manual; + } + else if (!strcmp(type,"off")) + { + type_check = type_check_off; + type_mode = type_mode_manual; + } + else if (!strcmp(type,"auto")) + { + type_mode = type_mode_auto; + set_type_range(); + /* Avoid hitting the set_type_str call below. We + did it in set_type_range. */ + return; + } + set_type_str(); + show_type_command(); +} + +/* Show command. Display a warning if the range setting does + not match the current language. */ +void +show_range_command(str, from_tty) + char *str; + int from_tty; +{ + + if (range_check != current_language->la_range_check) + printf( +"Warning: the current range check setting does not match the language.\n"); +} + +/* Set command. Change the setting for range checking. */ +void +set_range_command(str, from_tty) + char *str; + int from_tty; +{ + if (!strcmp(range,"on")) + { + range_check = range_check_on; + range_mode = range_mode_manual; + } + else if (!strcmp(range,"warn")) + { + range_check = range_check_warn; + range_mode = range_mode_manual; + } + else if (!strcmp(range,"off")) + { + range_check = range_check_off; + range_mode = range_mode_manual; + } + else if (!strcmp(range,"auto")) + { + range_mode = range_mode_auto; + set_type_range(); + /* Avoid hitting the set_range_str call below. We + did it in set_type_range. */ + return; + } + set_range_str(); + show_range_command(); +} + +/* Set the status of range and type checking based on + the current modes and the current language. + If SHOW is non-zero, then print out the current language, + type and range checking status. */ +static void +set_type_range() +{ + char *rtmp, *ttmp; + + if (range_mode == range_mode_auto) + range_check = current_language->la_range_check; + + if (type_mode == type_mode_auto) + type_check = current_language->la_type_check; + + set_type_str(); + set_range_str(); +} + +/* Set current language to (enum language) LANG. */ + +void +set_language(lang) + enum language lang; +{ + int i; + + for (i = 0; i < languages_size; i++) { + if (languages[i]->la_language == lang) { + current_language = languages[i]; + set_type_range (); + set_lang_str(); + } + } +} + +/* This page contains functions that update the global vars + language, type and range. */ +void +set_lang_str() +{ + char *tmp, *prefix = ""; + + free (language); + if (language_mode == language_mode_auto) + prefix = "auto; currently "; + + language = concat(prefix, current_language->la_name, ""); +} + +void +set_type_str() +{ + char *tmp, *prefix = ""; + + free (type); + if (type_mode==type_mode_auto) + prefix = "auto; currently "; + + switch(type_check) + { + case type_check_on: + tmp = "on"; + break; + case type_check_off: + tmp = "off"; + break; + case type_check_warn: + tmp = "warn"; + break; + default: + error ("Unrecognized type check setting."); + } + + type = concat(prefix,tmp,""); +} + +void +set_range_str() +{ + char *tmp, *pref = ""; + + free (range); + if (range_mode==range_mode_auto) + pref = "auto; currently "; + + switch(range_check) + { + case range_check_on: + tmp = "on"; + break; + case range_check_off: + tmp = "off"; + break; + case range_check_warn: + tmp = "warn"; + break; + default: + error ("Unrecognized range check setting."); + } + + range = concat(pref,tmp,""); +} + + +/* Print out the current language settings: language, range and + type checking. */ +void +language_info () +{ + printf("Current Language: %s\n",language); + show_language_command(); + printf("Type checking: %s\n",type); + show_type_command(); + printf("Range checking: %s\n",range); + show_range_command(); +} + +/* Return the result of a binary operation. */ +struct type * +binop_result_type(v1,v2) + value v1,v2; +{ + int l1,l2,size,uns; + + l1=TYPE_LENGTH(VALUE_TYPE(v1)); + l2=TYPE_LENGTH(VALUE_TYPE(v2)); + size = l1 > l2 ? l1 : l2; + uns = TYPE_UNSIGNED(VALUE_TYPE(v1)) || TYPE_UNSIGNED(VALUE_TYPE(v2)); + + switch(current_language->la_language) + { + case language_c: + if (TYPE_CODE(VALUE_TYPE(v1))==TYPE_CODE_FLT) + return TYPE_CODE(VALUE_TYPE(v2)) == TYPE_CODE_FLT && l2 > l1 ? + VALUE_TYPE(v2) : VALUE_TYPE(v1); + else if (TYPE_CODE(VALUE_TYPE(v2))==TYPE_CODE_FLT) + return TYPE_CODE(VALUE_TYPE(v1)) == TYPE_CODE_FLT && l1 > l2 ? + VALUE_TYPE(v1) : VALUE_TYPE(v2); + else if (TYPE_UNSIGNED(VALUE_TYPE(v1)) && l1 > l2) + return VALUE_TYPE(v1); + else if (TYPE_UNSIGNED(VALUE_TYPE(v2)) && l2 > l1) + return VALUE_TYPE(v2); + else /* Both are signed. Result is the longer type */ + return l1 > l2 ? VALUE_TYPE(v1) : VALUE_TYPE(v2); + break; + case language_m2: + /* If we are doing type-checking, l1 should equal l2, so this is + not needed. */ + return l1 > l2 ? VALUE_TYPE(v1) : VALUE_TYPE(v2); + break; + } +} + +/* This page contains functions that return format strings for + printf for printing out numbers in different formats */ + +/* Returns the appropriate printf format for hexadecimal + numbers. */ +char * +local_hex_format_custom(pre) + char *pre; +{ + static char form[50]; + + strcpy (form, current_language->la_hex_format_pre); + strcat (form, pre); + strcat (form, current_language->la_hex_format_suf); + return form; +} + +/* Converts a number to hexadecimal and stores it in a static + string. Returns a pointer to this string. */ +char * +local_hex_string (num) + int num; +{ + static char res[50]; + + sprintf (res, current_language->la_hex_format, num); + return res; +} + +/* Converts a number to custom hexadecimal and stores it in a static + string. Returns a pointer to this string. */ +char * +local_hex_string_custom(num,pre) + int num; + char *pre; +{ + static char res[50]; + + sprintf (res, local_hex_format_custom(pre), num); + return res; +} + +/* Returns the appropriate printf format for octal + numbers. */ +char * +local_octal_format_custom(pre) + char *pre; +{ + static char form[50]; + + strcpy (form, current_language->la_octal_format_pre); + strcat (form, pre); + strcat (form, current_language->la_octal_format_suf); + return form; +} + +/* This page contains functions that are used in type/range checking. + They all return zero if the type/range check fails. + + It is hoped that these will make extending GDB to parse different + languages a little easier. These are primarily used in eval.c when + evaluating expressions and making sure that their types are correct. + Instead of having a mess of conjucted/disjuncted expressions in an "if", + the ideas of type can be wrapped up in the following functions. + + Note that some of them are not currently dependent upon which language + is currently being parsed. For example, floats are the same in + C and Modula-2 (ie. the only floating point type has TYPE_CODE of + TYPE_CODE_FLT), while booleans are different. */ + +/* Returns non-zero if its argument is a simple type. This is the same for + both Modula-2 and for C. In the C case, TYPE_CODE_CHAR will never occur, + and thus will never cause the failure of the test. */ +int +simple_type(type) + struct type *type; +{ + switch (TYPE_CODE (type)) { + case TYPE_CODE_INT: + case TYPE_CODE_CHAR: + case TYPE_CODE_ENUM: + case TYPE_CODE_FLT: + case TYPE_CODE_RANGE: + case TYPE_CODE_BOOL: + return 1; + + default: + return 0; + } +} + +/* Returns non-zero if its argument is of an ordered type. */ +int +ordered_type (type) + struct type *type; +{ + switch (TYPE_CODE (type)) { + case TYPE_CODE_INT: + case TYPE_CODE_CHAR: + case TYPE_CODE_ENUM: + case TYPE_CODE_FLT: + case TYPE_CODE_RANGE: + return 1; + + default: + return 0; + } +} + +/* Returns non-zero if the two types are the same */ +int +same_type (arg1, arg2) + struct type *arg1, *arg2; +{ + if (structured_type(arg1) ? !structured_type(arg2) : structured_type(arg2)) + /* One is structured and one isn't */ + return 0; + else if (structured_type(arg1) && structured_type(arg2)) + return arg1 == arg2; + else if (numeric_type(arg1) && numeric_type(arg2)) + return (TYPE_CODE(arg2) == TYPE_CODE(arg1)) && + (TYPE_UNSIGNED(arg1) == TYPE_UNSIGNED(arg2)) + ? 1 : 0; + else + return arg1==arg2; +} + +/* Returns non-zero if the type is integral */ +int +integral_type (type) + struct type *type; +{ + switch(current_language->la_language) + { + case language_c: + return (TYPE_CODE(type) != TYPE_CODE_INT) && + (TYPE_CODE(type) != TYPE_CODE_ENUM) ? 0 : 1; + case language_m2: + return TYPE_CODE(type) != TYPE_CODE_INT ? 0 : 1; + default: + error ("Language not supported."); + } +} + +/* Returns non-zero if the value is numeric */ +int +numeric_type (type) + struct type *type; +{ + switch (TYPE_CODE (type)) { + case TYPE_CODE_INT: + case TYPE_CODE_FLT: + return 1; + + default: + return 0; + } +} + +/* Returns non-zero if the value is a character type */ +int +character_type (type) + struct type *type; +{ + switch(current_language->la_language) + { + case language_m2: + return TYPE_CODE(type) != TYPE_CODE_CHAR ? 0 : 1; + + case language_c: + return (TYPE_CODE(type) == TYPE_CODE_INT) && + TYPE_LENGTH(type) == sizeof(char) + ? 1 : 0; + } +} + +/* Returns non-zero if the value is a boolean type */ +int +boolean_type (type) + struct type *type; +{ + switch(current_language->la_language) + { + case language_m2: + return TYPE_CODE(type) != TYPE_CODE_BOOL ? 0 : 1; + + case language_c: + return TYPE_CODE(type) != TYPE_CODE_INT ? 0 : 1; + } +} + +/* Returns non-zero if the value is a floating-point type */ +int +float_type (type) + struct type *type; +{ + return TYPE_CODE(type) == TYPE_CODE_FLT; +} + +/* Returns non-zero if the value is a pointer type */ +int +pointer_type(type) + struct type *type; +{ + return TYPE_CODE(type) == TYPE_CODE_PTR || + TYPE_CODE(type) == TYPE_CODE_REF; +} + +/* Returns non-zero if the value is a structured type */ +int +structured_type(type) + struct type *type; +{ + switch(current_language->la_language) + { + case language_c: + return (TYPE_CODE(type) == TYPE_CODE_STRUCT) || + (TYPE_CODE(type) == TYPE_CODE_UNION) || + (TYPE_CODE(type) == TYPE_CODE_ARRAY); + case language_m2: + return (TYPE_CODE(type) == TYPE_CODE_STRUCT) || + (TYPE_CODE(type) == TYPE_CODE_SET) || + (TYPE_CODE(type) == TYPE_CODE_ARRAY); + } +} + +/* This page contains functions that return info about + (struct value) values used in GDB. */ + +/* Returns non-zero if the value VAL represents a true value. */ +int +value_true(val) + value val; +{ + int len, i; + struct type *type; + LONGEST v; + + switch (current_language->la_language) { + + case language_c: + return !value_zerop (val); + + case language_m2: + type = VALUE_TYPE(val); + if (TYPE_CODE (type) != TYPE_CODE_BOOL) + return 0; /* Not a BOOLEAN at all */ + /* Search the fields for one that matches the current value. */ + len = TYPE_NFIELDS (type); + v = value_as_long (val); + for (i = 0; i < len; i++) + { + QUIT; + if (v == TYPE_FIELD_BITPOS (type, i)) + break; + } + if (i >= len) + return 0; /* Not a valid BOOLEAN value */ + if (!strcmp ("TRUE", TYPE_FIELD_NAME(VALUE_TYPE(val), i))) + return 1; /* BOOLEAN with value TRUE */ + else + return 0; /* BOOLEAN with value FALSE */ + break; + + default: + error ("Language not supported."); + } +} + +/* Returns non-zero if the operator OP is defined on + the values ARG1 and ARG2. */ +void +binop_type_check(arg1,arg2,op) + value arg1,arg2; + int op; +{ + struct type *t1, *t2; + + /* If we're not checking types, always return success. */ + if (!STRICT_TYPE) + return; + + t1=VALUE_TYPE(arg1); + if (arg2!=(value)NULL) + t2=VALUE_TYPE(arg2); + else + t2=NULL; + + switch(op) + { + case BINOP_ADD: + case BINOP_SUB: + if ((numeric_type(t1) && pointer_type(t2)) || + (pointer_type(t1) && numeric_type(t2))) + { + printf("warning: combining pointer and integer.\n"); + break; + } + case BINOP_MUL: + case BINOP_LSH: + case BINOP_RSH: + if (!numeric_type(t1) || !numeric_type(t2)) + type_op_error ("Arguments to %s must be numbers.",op); + else if (!same_type(t1,t2)) + type_op_error ("Arguments to %s must be of the same type.",op); + break; + + case BINOP_AND: + case BINOP_OR: + if (!boolean_type(t1) || !boolean_type(t2)) + type_op_error ("Arguments to %s must be of boolean type.",op); + break; + + case BINOP_EQUAL: + if ((pointer_type(t1) && !(pointer_type(t2) || integral_type(t2))) || + (pointer_type(t2) && !(pointer_type(t1) || integral_type(t1)))) + type_op_error ("A pointer can only be compared to an integer or pointer.",op); + else if ((pointer_type(t1) && integral_type(t2)) || + (integral_type(t1) && pointer_type(t2))) + { + printf("warning: combining integer and pointer.\n"); + break; + } + else if (!simple_type(t1) || !simple_type(t2)) + type_op_error ("Arguments to %s must be of simple type.",op); + else if (!same_type(t1,t2)) + type_op_error ("Arguments to %s must be of the same type.",op); + break; + + case BINOP_REM: + if (!integral_type(t1) || !integral_type(t2)) + type_op_error ("Arguments to %s must be of integral type.",op); + break; + + case BINOP_LESS: + case BINOP_GTR: + case BINOP_LEQ: + case BINOP_GEQ: + if (!ordered_type(t1) || !ordered_type(t2)) + type_op_error ("Arguments to %s must be of ordered type.",op); + else if (!same_type(t1,t2)) + type_op_error ("Arguments to %s must be of the same type.",op); + break; + + case BINOP_ASSIGN: + if (pointer_type(t1) && !integral_type(t2)) + type_op_error ("A pointer can only be assigned an integer.",op); + else if (pointer_type(t1) && integral_type(t2)) + { + printf("warning: combining integer and pointer."); + break; + } + else if (!simple_type(t1) || !simple_type(t2)) + type_op_error ("Arguments to %s must be of simple type.",op); + else if (!same_type(t1,t2)) + type_op_error ("Arguments to %s must be of the same type.",op); + break; + + /* Unary checks -- arg2 is null */ + + case UNOP_ZEROP: + if (!boolean_type(t1)) + type_op_error ("Argument to %s must be of boolean type.",op); + break; + + case UNOP_PLUS: + case UNOP_NEG: + if (!numeric_type(t1)) + type_op_error ("Argument to %s must be of numeric type.",op); + break; + + case UNOP_IND: + if (integral_type(t1)) + { + printf("warning: combining pointer and integer.\n"); + break; + } + else if (!pointer_type(t1)) + type_op_error ("Argument to %s must be a pointer.",op); + break; + + case UNOP_PREINCREMENT: + case UNOP_POSTINCREMENT: + case UNOP_PREDECREMENT: + case UNOP_POSTDECREMENT: + if (!ordered_type(t1)) + type_op_error ("Argument to %s must be of an ordered type.",op); + break; + + default: + /* Ok. The following operators have different meanings in + different languages. */ + switch(current_language->la_language) + { +#ifdef _LANG_c + case language_c: + switch(op) + { + case BINOP_DIV: + if (!numeric_type(t1) || !numeric_type(t2)) + type_op_error ("Arguments to %s must be numbers.",op); + break; + } + break; +#endif + +#ifdef _LANG_m2 + case language_m2: + switch(op) + { + case BINOP_DIV: + if (!float_type(t1) || !float_type(t2)) + type_op_error ("Arguments to %s must be floating point numbers.",op); + break; + case BINOP_INTDIV: + if (!integral_type(t1) || !integral_type(t2)) + type_op_error ("Arguments to %s must be of integral type.",op); + break; + } +#endif + } + } +} + +/* This page contains functions for the printing out of + error messages that occur during type- and range- + checking. */ + +/* Prints the format string FMT with the operator as a string + corresponding to the opcode OP. If FATAL is non-zero, then + this is an error and error () is called. Otherwise, it is + a warning and printf() is called. */ +void +op_error (fmt,op,fatal) + char *fmt; + enum exp_opcode op; + int fatal; +{ + if (fatal) + error (fmt,op_string(op)); + else + { + printf("warning: "); + printf(fmt,op_string(op)); + printf("\n"); + } +} + +/* These are called when a language fails a type- or range-check. + The first argument should be a printf()-style format string, and + the rest of the arguments should be its arguments. If + [type|range]_check is [type|range]_check_on, then return_to_top_level() + is called in the style of error (). Otherwise, the message is prefixed + by "warning: " and we do not return to the top level. */ +void +type_error (va_alist) + va_dcl +{ + va_list args; + char *string; + + if (type_check==type_check_warn) + fprintf(stderr,"warning: "); + else + target_terminal_ours(); + + va_start (args); + string = va_arg (args, char *); + vfprintf (stderr, string, args); + fprintf (stderr, "\n"); + va_end (args); + if (type_check==type_check_on) + return_to_top_level(); +} + +void +range_error (va_alist) + va_dcl +{ + va_list args; + char *string; + + if (range_check==range_check_warn) + fprintf(stderr,"warning: "); + else + target_terminal_ours(); + + va_start (args); + string = va_arg (args, char *); + vfprintf (stderr, string, args); + fprintf (stderr, "\n"); + va_end (args); + if (range_check==range_check_on) + return_to_top_level(); +} + + +/* This page contains miscellaneous functions */ + +/* Return the language as a string */ +char * +language_str(lang) + enum language lang; +{ + int i; + + for (i = 0; i < languages_size; i++) { + if (languages[i]->la_language == lang) { + return languages[i]->la_name; + } + } + return "Unknown"; +} + +struct cmd_list_element *setchecklist = NULL; +struct cmd_list_element *showchecklist = NULL; + +static void +set_check (arg, from_tty) + char *arg; + int from_tty; +{ + printf( +"\"set check\" must be followed by the name of a check subcommand.\n"); + help_list(setchecklist, "set check ", -1, stdout); +} + +static void +show_check (arg, from_tty) + char *arg; + int from_tty; +{ + cmd_show_list(showchecklist, from_tty, ""); +} + +/* Add a language to the set of known languages. */ + +void +add_language (lang) + struct language_defn *lang; +{ + if (lang->la_magic != LANG_MAGIC) + { + fprintf(stderr, "Magic number of %s language struct wrong\n", + lang->la_name); + abort(); + } + + if (!languages) + { + languages_allocsize = DEFAULT_ALLOCSIZE; + languages = (struct language_defn **) xmalloc + (languages_allocsize * sizeof (*languages)); + } + if (languages_size >= languages_allocsize) + { + languages_allocsize *= 2; + languages = (struct language_defn **) xrealloc (languages, + languages_allocsize * sizeof (*languages)); + } + languages[languages_size++] = lang; + +#if FIXME + if (targetlist == NULL) + add_prefix_cmd ("target", class_run, target_command, + "Connect to a target machine or process.\n\ +The first argument is the type or protocol of the target machine.\n\ +Remaining arguments are interpreted by the target protocol. For more\n\ +information on the arguments for a particular protocol, type\n\ +`help target ' followed by the protocol name.", + &targetlist, "target ", 0, &cmdlist); + add_cmd (t->to_shortname, no_class, t->to_open, t->to_doc, &targetlist); +#endif FIXME +} + +/* Define the language that is no language. */ + +int +unk_lang_parser () +{ + return 1; +} + +void +unk_lang_error () +{ + error ("Attempted to parse an expression with unknown language"); +} + +static struct type ** const (unknown_builtin_types[]) = { 0 }; +static const struct op_print unk_op_print_tab[] = { 0 }; + +const struct language_defn unknown_language_defn = { + "unknown", + language_unknown, + &unknown_builtin_types[0], + range_check_off, + type_check_off, + unk_lang_parser, + unk_lang_error, + &builtin_type_error, /* longest signed integral type */ + &builtin_type_error, /* longest unsigned integral type */ + &builtin_type_error, /* longest floating point type */ + "0x%x", "0x%", "x", /* Hex format, prefix, suffix */ + "0%o", "0%", "o", /* Octal format, prefix, suffix */ + unk_op_print_tab, /* expression operators for printing */ + LANG_MAGIC +}; + +/* These two structs define fake entries for the "local" and "auto" options. */ +const struct language_defn auto_language_defn = { + "auto", + language_auto, + &unknown_builtin_types[0], + range_check_off, + type_check_off, + unk_lang_parser, + unk_lang_error, + &builtin_type_error, /* longest signed integral type */ + &builtin_type_error, /* longest unsigned integral type */ + &builtin_type_error, /* longest floating point type */ + "0x%x", "0x%", "x", /* Hex format, prefix, suffix */ + "0%o", "0%", "o", /* Octal format, prefix, suffix */ + unk_op_print_tab, /* expression operators for printing */ + LANG_MAGIC +}; + +const struct language_defn local_language_defn = { + "local", + language_auto, + &unknown_builtin_types[0], + range_check_off, + type_check_off, + unk_lang_parser, + unk_lang_error, + &builtin_type_error, /* longest signed integral type */ + &builtin_type_error, /* longest unsigned integral type */ + &builtin_type_error, /* longest floating point type */ + "0x%x", "0x%", "x", /* Hex format, prefix, suffix */ + "0%o", "0%", "o", /* Octal format, prefix, suffix */ + unk_op_print_tab, /* expression operators for printing */ + LANG_MAGIC +}; + +/* Initialize the language routines */ + +void +_initialize_language() +{ + struct cmd_list_element *set, *show; + + /* GDB commands for language specific stuff */ + + set = add_set_cmd ("language", class_support, var_string_noescape, + (char *)&language, + "Set the current working language.", + &setlist); + show = add_show_from_set (set, &showlist); + set->function = set_language_command; + show->function = show_language_command; + + add_prefix_cmd ("check", no_class, set_check, + "Set the status of the type/range checker", + &setchecklist, "set check ", 0, &setlist); + add_alias_cmd ("c", "check", no_class, 1, &setlist); + add_alias_cmd ("ch", "check", no_class, 1, &setlist); + + add_prefix_cmd ("check", no_class, show_check, + "Show the status of the type/range checker", + &showchecklist, "set check ", 0, &showlist); + add_alias_cmd ("c", "check", no_class, 1, &showlist); + add_alias_cmd ("ch", "check", no_class, 1, &showlist); + + set = add_set_cmd ("type", class_support, var_string_noescape, + (char *)&type, + "Set type checking on/warn/off/auto.", + &setchecklist); + show = add_show_from_set (set, &showchecklist); + set->function = set_type_command; + show->function = show_type_command; + + set = add_set_cmd ("range", class_support, var_string_noescape, + (char *)&range, + "Set range checking on/warn/off/auto.", + &setchecklist); + show = add_show_from_set (set, &showchecklist); + set->function = set_range_command; + show->function = show_range_command; + + add_language (&unknown_language_defn); + add_language (&local_language_defn); + add_language (&auto_language_defn); + + language = savestring ("auto",strlen("auto")); + range = savestring ("auto",strlen("auto")); + type = savestring ("auto",strlen("auto")); + + /* Have the above take effect */ + + set_language_command (NULL, 0); + set_type_command (NULL, 0); + set_range_command (NULL, 0); +} diff --git a/gdb/language.h b/gdb/language.h new file mode 100644 index 00000000000..8ca4ef46044 --- /dev/null +++ b/gdb/language.h @@ -0,0 +1,168 @@ +/* Source-language-related definitions for GDB. + Copyright 1991 Free Software Foundation, Inc. + Contributed by the Department of Computer Science at the State University + of New York at Buffalo. + +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., 675 Mass Ave, Cambridge, MA 02139, USA. */ + +/* This used to be included to configure GDB for one or more specific + languages. Now it is shortcutted to configure for all of them. FIXME. */ +/* #include "lang_def.h" */ +#define _LANG_c +#define _LANG_m2 + +/* range_mode == + range_mode_auto: range_check set automatically to default of language. + range_mode_manual: range_check set manually by user. */ + +extern enum range_mode {range_mode_auto, range_mode_manual} range_mode; + +/* range_check == + range_check_on: Ranges are checked in GDB expressions, producing errors. + range_check_warn: Ranges are checked, producing warnings. + range_check_off: Ranges are not checked in GDB expressions. */ + +extern enum range_check + {range_check_off, range_check_warn, range_check_on} range_check; + +/* type_mode == + type_mode_auto: type_check set automatically to default of language + type_mode_manual: type_check set manually by user. */ + +extern enum type_mode {type_mode_auto, type_mode_manual} type_mode; + +/* type_check == + type_check_on: Types are checked in GDB expressions, producing errors. + type_check_warn: Types are checked, producing warnings. + type_check_off: Types are not checked in GDB expressions. */ + +extern enum type_check + {type_check_off, type_check_warn, type_check_on} type_check; + +/* Structure tying together assorted information about a language. */ + +struct language_defn { + char * la_name; /* Name of the language */ + enum language la_language; /* its symtab language-enum (defs.h) */ + struct type ** const + *la_builtin_type_vector; /* Its builtin types */ + enum range_check la_range_check; /* Default range checking */ + enum type_check la_type_check; /* Default type checking */ + int (*la_parser)(); /* Parser function */ + void (*la_error)(); /* Parser error function */ + struct type **la_longest_int; /* Longest signed integral type */ + struct type **la_longest_unsigned_int; /* Longest uns integral type */ + struct type **la_longest_float; /* Longest floating point type */ + char *la_hex_format; /* Hexadecimal printf format str */ + char *la_hex_format_pre; /* Prefix for custom format string */ + char *la_hex_format_suf; /* Suffix for custom format string */ + char *la_octal_format; /* Octal printf format str */ + char *la_octal_format_pre; /* Prefix for custom format string */ + char *la_octal_format_suf; /* Suffix for custom format string */ +const struct op_print + *la_op_print_tab; /* Table for printing expressions */ +/* Add fields above this point, so the magic number is always last. */ + long la_magic; /* Magic number for compat checking */ +}; + +#define LANG_MAGIC 910823L + +/* Pointer to the language_defn for our current language. This pointer + always points to *some* valid struct; it can be used without checking + it for validity. */ + +extern struct language_defn *current_language; + +/* language_mode == + language_mode_auto: current_language automatically set upon selection + of scope (e.g. stack frame) + language_mode_manual: current_language set only by user. */ + +extern enum language_mode + {language_mode_auto, language_mode_manual} language_mode; + +/* These macros define the behaviour of the expression + evaluator. */ + +/* Should we strictly type check expressions? */ +#define STRICT_TYPE (type_check != range_check_off) + +/* Should we range check values against the domain of their type? */ +#define RANGE_CHECK (range_check != type_check_off) + +/* "cast" really means conversion */ +/* FIXME -- should be a setting in language_defn */ +#define CAST_IS_CONVERSION (current_language->la_language == language_c) + +void language_info(); +void set_language(); + +/* This page contains functions that return things that are + specific to languages. Each of these functions is based on + the current setting of working_lang, which the user sets + with the "set language" command. */ + +/* Returns some built-in types */ +#define longest_int() (*current_language->la_longest_int) +#define longest_unsigned_int() (*current_language->la_longest_unsigned_int) +#define longest_float() (*current_language->la_longest_float) +struct type *binop_result_type(); + +/* Hexadecimal number formatting is in defs.h because it is so common + throughout GDB. */ + +/* Return a format string for printf that will print a number in the local + (language-specific) octal format. Result is static and is + overwritten by the next call. local_octal_format_custom takes printf + options like "08" or "l" (to produce e.g. %08x or %lx). */ + +#define local_octal_format() (current_language->la_octal_format) +char *local_octal_format_custom(); + +/* Type predicates */ +int simple_type(); +int ordered_type(); +int same_type(); +int integral_type(); +int numeric_type(); +int character_type(); +int boolean_type(); +int float_type(); +int pointer_type(); +int structured_type(); + +/* Checks Binary and Unary operations for semantic type correctness */ +void binop_type_check(); +#define unop_type_check(v,o) binop_type_check((v),NULL,(o)) + +/* Error messages */ +void op_error(); +#define type_op_error(f,o) \ + op_error((f),(o),type_check==type_check_on ? 1 : 0) +#define range_op_error(f,o) \ + op_error((f),(o),range_check==range_check_on ? 1 : 0) +void type_error(); +void range_error(); + +/* Data: Does this value represent "truth" to the current language? */ +int value_true(); + +/* Misc: The string representing a particular enum language. */ +char *language_str(); + +/* Add a language to the set known by GDB (at initialization time). */ +void add_language (); /* Arg is &language_defn */ -- 2.30.2