/* C language support routines for GDB, the GNU debugger. Copyright 1992, 1993, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "defs.h" #include "symtab.h" #include "gdbtypes.h" #include "expression.h" #include "parser-defs.h" #include "language.h" #include "c-lang.h" /* Print the character C on STREAM as part of the contents of a literal string whose delimiter is QUOTER. Note that that format for printing characters and strings is language specific. */ static void emit_char (c, stream, quoter) register int c; GDB_FILE *stream; int quoter; { c &= 0xFF; /* Avoid sign bit follies */ if (PRINT_LITERAL_FORM (c)) { if (c == '\\' || c == quoter) { fputs_filtered ("\\", stream); } fprintf_filtered (stream, "%c", c); } else { switch (c) { case '\n': fputs_filtered ("\\n", stream); break; case '\b': fputs_filtered ("\\b", stream); break; case '\t': fputs_filtered ("\\t", stream); break; case '\f': fputs_filtered ("\\f", stream); break; case '\r': fputs_filtered ("\\r", stream); break; case '\033': fputs_filtered ("\\e", stream); break; case '\007': fputs_filtered ("\\a", stream); break; default: fprintf_filtered (stream, "\\%.3o", (unsigned int) c); break; } } } static void c_printchar (c, stream) int c; GDB_FILE *stream; { fputs_filtered ("'", stream); emit_char (c, stream, '\''); fputs_filtered ("'", stream); } /* Print the character string STRING, printing at most LENGTH characters. Printing stops early if the number hits print_max; repeat counts are printed as appropriate. Print ellipses at the end if we had to stop before printing LENGTH characters, or if FORCE_ELLIPSES. */ static void c_printstr (stream, string, length, force_ellipses) GDB_FILE *stream; char *string; unsigned int length; int force_ellipses; { register unsigned int i; unsigned int things_printed = 0; int in_quotes = 0; int need_comma = 0; extern int inspect_it; extern int repeat_count_threshold; extern int print_max; /* If the string was not truncated due to `set print elements', and the last byte of it is a null, we don't print that, in traditional C style. */ if ((!force_ellipses) && length > 0 && string[length-1] == '\0') length--; if (length == 0) { fputs_filtered ("\"\"", stream); return; } for (i = 0; i < length && things_printed < print_max; ++i) { /* Position of the character we are examining to see whether it is repeated. */ unsigned int rep1; /* Number of repetitions we have detected so far. */ unsigned int reps; QUIT; if (need_comma) { fputs_filtered (", ", stream); need_comma = 0; } rep1 = i + 1; reps = 1; while (rep1 < length && string[rep1] == string[i]) { ++rep1; ++reps; } if (reps > repeat_count_threshold) { if (in_quotes) { if (inspect_it) fputs_filtered ("\\\", ", stream); else fputs_filtered ("\", ", stream); in_quotes = 0; } c_printchar (string[i], stream); fprintf_filtered (stream, " <repeats %u times>", reps); i = rep1 - 1; things_printed += repeat_count_threshold; need_comma = 1; } else { if (!in_quotes) { if (inspect_it) fputs_filtered ("\\\"", stream); else fputs_filtered ("\"", stream); in_quotes = 1; } emit_char (string[i], stream, '"'); ++things_printed; } } /* Terminate the quotes if necessary. */ if (in_quotes) { if (inspect_it) fputs_filtered ("\\\"", stream); else fputs_filtered ("\"", stream); } if (force_ellipses || i < length) fputs_filtered ("...", stream); } /* Create a fundamental C type using default reasonable for the current target machine. Some object/debugging file formats (DWARF version 1, COFF, etc) do not define fundamental types such as "int" or "double". Others (stabs or DWARF version 2, etc) do define fundamental types. For the formats which don't provide fundamental types, gdb can create such types using this function. FIXME: Some compilers distinguish explicitly signed integral types (signed short, signed int, signed long) from "regular" integral types (short, int, long) in the debugging information. There is some dis- agreement as to how useful this feature is. In particular, gcc does not support this. Also, only some debugging formats allow the distinction to be passed on to a debugger. For now, we always just use "short", "int", or "long" as the type name, for both the implicit and explicitly signed types. This also makes life easier for the gdb test suite since we don't have to account for the differences in output depending upon what the compiler and debugging format support. We will probably have to re-examine the issue when gdb starts taking it's fundamental type information directly from the debugging information supplied by the compiler. fnf@cygnus.com */ static struct type * c_create_fundamental_type (objfile, typeid) struct objfile *objfile; int typeid; { register struct type *type = NULL; switch (typeid) { default: /* FIXME: For now, if we are asked to produce a type not in this language, create the equivalent of a C integer type with the name "<?type?>". When all the dust settles from the type reconstruction work, this should probably become an error. */ type = init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT, 0, "<?type?>", objfile); warning ("internal error: no C/C++ fundamental type %d", typeid); break; case FT_VOID: type = init_type (TYPE_CODE_VOID, TARGET_CHAR_BIT / TARGET_CHAR_BIT, 0, "void", objfile); break; case FT_CHAR: type = init_type (TYPE_CODE_INT, TARGET_CHAR_BIT / TARGET_CHAR_BIT, 0, "char", objfile); break; case FT_SIGNED_CHAR: type = init_type (TYPE_CODE_INT, TARGET_CHAR_BIT / TARGET_CHAR_BIT, 0, "signed char", objfile); break; case FT_UNSIGNED_CHAR: type = init_type (TYPE_CODE_INT, TARGET_CHAR_BIT / TARGET_CHAR_BIT, TYPE_FLAG_UNSIGNED, "unsigned char", objfile); break; case FT_SHORT: type = init_type (TYPE_CODE_INT, TARGET_SHORT_BIT / TARGET_CHAR_BIT, 0, "short", objfile); break; case FT_SIGNED_SHORT: type = init_type (TYPE_CODE_INT, TARGET_SHORT_BIT / TARGET_CHAR_BIT, 0, "short", objfile); /* FIXME-fnf */ break; case FT_UNSIGNED_SHORT: type = init_type (TYPE_CODE_INT, TARGET_SHORT_BIT / TARGET_CHAR_BIT, TYPE_FLAG_UNSIGNED, "unsigned short", objfile); break; case FT_INTEGER: type = init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT, 0, "int", objfile); break; case FT_SIGNED_INTEGER: type = init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT, 0, "int", objfile); /* FIXME -fnf */ break; case FT_UNSIGNED_INTEGER: type = init_type (TYPE_CODE_INT, TARGET_INT_BIT / TARGET_CHAR_BIT, TYPE_FLAG_UNSIGNED, "unsigned int", objfile); break; case FT_LONG: type = init_type (TYPE_CODE_INT, TARGET_LONG_BIT / TARGET_CHAR_BIT, 0, "long", objfile); break; case FT_SIGNED_LONG: type = init_type (TYPE_CODE_INT, TARGET_LONG_BIT / TARGET_CHAR_BIT, 0, "long", objfile); /* FIXME -fnf */ break; case FT_UNSIGNED_LONG: type = init_type (TYPE_CODE_INT, TARGET_LONG_BIT / TARGET_CHAR_BIT, TYPE_FLAG_UNSIGNED, "unsigned long", objfile); break; case FT_LONG_LONG: type = init_type (TYPE_CODE_INT, TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, 0, "long long", objfile); break; case FT_SIGNED_LONG_LONG: type = init_type (TYPE_CODE_INT, TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, 0, "signed long long", objfile); break; case FT_UNSIGNED_LONG_LONG: type = init_type (TYPE_CODE_INT, TARGET_LONG_LONG_BIT / TARGET_CHAR_BIT, TYPE_FLAG_UNSIGNED, "unsigned long long", objfile); break; case FT_FLOAT: type = init_type (TYPE_CODE_FLT, TARGET_FLOAT_BIT / TARGET_CHAR_BIT, 0, "float", objfile); break; case FT_DBL_PREC_FLOAT: type = init_type (TYPE_CODE_FLT, TARGET_DOUBLE_BIT / TARGET_CHAR_BIT, 0, "double", objfile); break; case FT_EXT_PREC_FLOAT: type = init_type (TYPE_CODE_FLT, TARGET_LONG_DOUBLE_BIT / TARGET_CHAR_BIT, 0, "long double", objfile); break; } return (type); } /* Table mapping opcodes into strings for printing operators and precedences of the operators. */ static const struct op_print c_op_print_tab[] = { {",", BINOP_COMMA, PREC_COMMA, 0}, {"=", BINOP_ASSIGN, PREC_ASSIGN, 1}, {"||", BINOP_LOGICAL_OR, PREC_LOGICAL_OR, 0}, {"&&", BINOP_LOGICAL_AND, PREC_LOGICAL_AND, 0}, {"|", BINOP_BITWISE_IOR, PREC_BITWISE_IOR, 0}, {"^", BINOP_BITWISE_XOR, PREC_BITWISE_XOR, 0}, {"&", BINOP_BITWISE_AND, PREC_BITWISE_AND, 0}, {"==", BINOP_EQUAL, PREC_EQUAL, 0}, {"!=", BINOP_NOTEQUAL, PREC_EQUAL, 0}, {"<=", BINOP_LEQ, PREC_ORDER, 0}, {">=", BINOP_GEQ, PREC_ORDER, 0}, {">", BINOP_GTR, PREC_ORDER, 0}, {"<", BINOP_LESS, PREC_ORDER, 0}, {">>", BINOP_RSH, PREC_SHIFT, 0}, {"<<", BINOP_LSH, PREC_SHIFT, 0}, {"+", BINOP_ADD, PREC_ADD, 0}, {"-", BINOP_SUB, PREC_ADD, 0}, {"*", BINOP_MUL, PREC_MUL, 0}, {"/", BINOP_DIV, PREC_MUL, 0}, {"%", BINOP_REM, PREC_MUL, 0}, {"@", BINOP_REPEAT, PREC_REPEAT, 0}, {"-", UNOP_NEG, PREC_PREFIX, 0}, {"!", UNOP_LOGICAL_NOT, PREC_PREFIX, 0}, {"~", UNOP_COMPLEMENT, PREC_PREFIX, 0}, {"*", UNOP_IND, PREC_PREFIX, 0}, {"&", UNOP_ADDR, PREC_PREFIX, 0}, {"sizeof ", UNOP_SIZEOF, PREC_PREFIX, 0}, {"++", UNOP_PREINCREMENT, PREC_PREFIX, 0}, {"--", UNOP_PREDECREMENT, PREC_PREFIX, 0}, /* C++ */ {"::", BINOP_SCOPE, PREC_PREFIX, 0}, {NULL, 0, 0, 0} }; struct type ** const (c_builtin_types[]) = { &builtin_type_int, &builtin_type_long, &builtin_type_short, &builtin_type_char, &builtin_type_float, &builtin_type_double, &builtin_type_void, &builtin_type_long_long, &builtin_type_signed_char, &builtin_type_unsigned_char, &builtin_type_unsigned_short, &builtin_type_unsigned_int, &builtin_type_unsigned_long, &builtin_type_unsigned_long_long, &builtin_type_long_double, &builtin_type_complex, &builtin_type_double_complex, 0 }; const struct language_defn c_language_defn = { "c", /* Language name */ language_c, c_builtin_types, range_check_off, type_check_off, c_parse, c_error, evaluate_subexp_standard, c_printchar, /* Print a character constant */ c_printstr, /* Function to print string constant */ c_create_fundamental_type, /* Create fundamental type in this language */ c_print_type, /* Print a type using appropriate syntax */ c_val_print, /* Print a value using appropriate syntax */ c_value_print, /* Print a top-level value */ {"", "", "", ""}, /* Binary format info */ {"0%lo", "0", "o", ""}, /* Octal format info */ {"%ld", "", "d", ""}, /* Decimal format info */ {"0x%lx", "0x", "x", ""}, /* Hex format info */ c_op_print_tab, /* expression operators for printing */ 1, /* c-style arrays */ 0, /* String lower bound */ &builtin_type_char, /* Type of string elements */ LANG_MAGIC }; const struct language_defn cplus_language_defn = { "c++", /* Language name */ language_cplus, c_builtin_types, range_check_off, type_check_off, c_parse, c_error, evaluate_subexp_standard, c_printchar, /* Print a character constant */ c_printstr, /* Function to print string constant */ c_create_fundamental_type, /* Create fundamental type in this language */ c_print_type, /* Print a type using appropriate syntax */ c_val_print, /* Print a value using appropriate syntax */ c_value_print, /* Print a top-level value */ {"", "", "", ""}, /* Binary format info */ {"0%lo", "0", "o", ""}, /* Octal format info */ {"%ld", "", "d", ""}, /* Decimal format info */ {"0x%lx", "0x", "x", ""}, /* Hex format info */ c_op_print_tab, /* expression operators for printing */ 1, /* c-style arrays */ 0, /* String lower bound */ &builtin_type_char, /* Type of string elements */ LANG_MAGIC }; const struct language_defn asm_language_defn = { "asm", /* Language name */ language_asm, c_builtin_types, range_check_off, type_check_off, c_parse, c_error, evaluate_subexp_standard, c_printchar, /* Print a character constant */ c_printstr, /* Function to print string constant */ c_create_fundamental_type, /* Create fundamental type in this language */ c_print_type, /* Print a type using appropriate syntax */ c_val_print, /* Print a value using appropriate syntax */ c_value_print, /* Print a top-level value */ {"", "", "", ""}, /* Binary format info */ {"0%lo", "0", "o", ""}, /* Octal format info */ {"%ld", "", "d", ""}, /* Decimal format info */ {"0x%lx", "0x", "x", ""}, /* Hex format info */ c_op_print_tab, /* expression operators for printing */ 1, /* c-style arrays */ 0, /* String lower bound */ &builtin_type_char, /* Type of string elements */ LANG_MAGIC }; void _initialize_c_language () { add_language (&c_language_defn); add_language (&cplus_language_defn); add_language (&asm_language_defn); }