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1244 lines
29 KiB
Plaintext
1244 lines
29 KiB
Plaintext
/* YACC grammar for Modula-2 expressions, for GDB.
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Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
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Generated from expread.y (now c-exp.y) and contributed by the Department
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of Computer Science at the State University of New York at Buffalo, 1991.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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/* Parse a Modula-2 expression from text in a string,
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and return the result as a struct expression pointer.
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That structure contains arithmetic operations in reverse polish,
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with constants represented by operations that are followed by special data.
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See expression.h for the details of the format.
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What is important here is that it can be built up sequentially
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during the process of parsing; the lower levels of the tree always
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come first in the result. */
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%{
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#include <stdio.h>
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#include <string.h>
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#include "defs.h"
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#include "symtab.h"
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#include "frame.h"
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#include "expression.h"
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#include "language.h"
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#include "value.h"
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#include "parser-defs.h"
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/* These MUST be included in any grammar file!!!!
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Please choose unique names! */
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#define yymaxdepth m2_maxdepth
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#define yyparse m2_parse
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#define yylex m2_lex
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#define yyerror m2_error
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#define yylval m2_lval
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#define yychar m2_char
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#define yydebug m2_debug
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#define yypact m2_pact
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#define yyr1 m2_r1
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#define yyr2 m2_r2
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#define yydef m2_def
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#define yychk m2_chk
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#define yypgo m2_pgo
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#define yyact m2_act
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#define yyexca m2_exca
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#define yyerrflag m2_errflag
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#define yynerrs m2_nerrs
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#define yyps m2_ps
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#define yypv m2_pv
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#define yys m2_s
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#define yy_yys m2_yys
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#define yystate m2_state
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#define yytmp m2_tmp
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#define yyv m2_v
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#define yy_yyv m2_yyv
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#define yyval m2_val
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#define yylloc m2_lloc
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/* Forward decl's */
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void yyerror ();
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static int yylex ();
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int yyparse ();
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/* The sign of the number being parsed. */
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int number_sign = 1;
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/* The block that the module specified by the qualifer on an identifer is
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contained in, */
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struct block *modblock=0;
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char *make_qualname();
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/* #define YYDEBUG 1 */
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%}
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/* Although the yacc "value" of an expression is not used,
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since the result is stored in the structure being created,
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other node types do have values. */
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%union
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{
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LONGEST lval;
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unsigned LONGEST ulval;
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double dval;
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struct symbol *sym;
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struct type *tval;
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struct stoken sval;
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int voidval;
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struct block *bval;
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enum exp_opcode opcode;
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struct internalvar *ivar;
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struct type **tvec;
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int *ivec;
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}
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%type <voidval> exp type_exp start set
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%type <voidval> variable
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%type <tval> type
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%type <bval> block
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%type <sym> fblock
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%token <lval> INT HEX ERROR
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%token <ulval> UINT TRUE FALSE CHAR
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%token <dval> FLOAT
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/* Both NAME and TYPENAME tokens represent symbols in the input,
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and both convey their data as strings.
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But a TYPENAME is a string that happens to be defined as a typedef
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or builtin type name (such as int or char)
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and a NAME is any other symbol.
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Contexts where this distinction is not important can use the
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nonterminal "name", which matches either NAME or TYPENAME. */
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%token <sval> STRING
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%token <sval> NAME BLOCKNAME IDENT CONST VARNAME
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%token <sval> TYPENAME
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%token SIZE CAP ORD HIGH ABS MIN_FUNC MAX_FUNC FLOAT_FUNC VAL CHR ODD TRUNC
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%token INC DEC INCL EXCL
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/* The GDB scope operator */
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%token COLONCOLON
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%token <lval> LAST REGNAME
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%token <ivar> INTERNAL_VAR
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/* M2 tokens */
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%left ','
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%left ABOVE_COMMA
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%nonassoc ASSIGN
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%left '<' '>' LEQ GEQ '=' NOTEQUAL '#' IN
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%left OR
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%left AND '&'
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%left '@'
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%left '+' '-'
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%left '*' '/' DIV MOD
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%right UNARY
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%right '^' DOT '[' '('
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%right NOT '~'
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%left COLONCOLON QID
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/* This is not an actual token ; it is used for precedence.
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%right QID
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*/
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%%
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start : exp
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| type_exp
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;
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type_exp: type
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{ write_exp_elt_opcode(OP_TYPE);
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write_exp_elt_type($1);
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write_exp_elt_opcode(OP_TYPE);
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}
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;
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/* Expressions */
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exp : exp '^' %prec UNARY
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{ write_exp_elt_opcode (UNOP_IND); }
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exp : '-'
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{ number_sign = -1; }
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exp %prec UNARY
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{ number_sign = 1;
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write_exp_elt_opcode (UNOP_NEG); }
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;
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exp : '+' exp %prec UNARY
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{ write_exp_elt_opcode(UNOP_PLUS); }
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;
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exp : not_exp exp %prec UNARY
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{ write_exp_elt_opcode (UNOP_ZEROP); }
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;
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not_exp : NOT
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| '~'
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;
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exp : CAP '(' exp ')'
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{ write_exp_elt_opcode (UNOP_CAP); }
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;
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exp : ORD '(' exp ')'
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{ write_exp_elt_opcode (UNOP_ORD); }
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;
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exp : ABS '(' exp ')'
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{ write_exp_elt_opcode (UNOP_ABS); }
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;
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exp : HIGH '(' exp ')'
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{ write_exp_elt_opcode (UNOP_HIGH); }
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;
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exp : MIN_FUNC '(' type ')'
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{ write_exp_elt_opcode (UNOP_MIN);
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write_exp_elt_type ($3);
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write_exp_elt_opcode (UNOP_MIN); }
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;
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exp : MAX_FUNC '(' type ')'
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{ write_exp_elt_opcode (UNOP_MAX);
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write_exp_elt_type ($3);
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write_exp_elt_opcode (UNOP_MIN); }
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;
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exp : FLOAT_FUNC '(' exp ')'
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{ write_exp_elt_opcode (UNOP_FLOAT); }
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;
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exp : VAL '(' type ',' exp ')'
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{ write_exp_elt_opcode (BINOP_VAL);
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write_exp_elt_type ($3);
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write_exp_elt_opcode (BINOP_VAL); }
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;
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exp : CHR '(' exp ')'
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{ write_exp_elt_opcode (UNOP_CHR); }
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;
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exp : ODD '(' exp ')'
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{ write_exp_elt_opcode (UNOP_ODD); }
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;
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exp : TRUNC '(' exp ')'
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{ write_exp_elt_opcode (UNOP_TRUNC); }
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;
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exp : SIZE exp %prec UNARY
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{ write_exp_elt_opcode (UNOP_SIZEOF); }
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;
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exp : INC '(' exp ')'
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{ write_exp_elt_opcode(UNOP_PREINCREMENT); }
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;
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exp : INC '(' exp ',' exp ')'
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{ write_exp_elt_opcode(BINOP_ASSIGN_MODIFY);
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write_exp_elt_opcode(BINOP_ADD);
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write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); }
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;
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exp : DEC '(' exp ')'
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{ write_exp_elt_opcode(UNOP_PREDECREMENT);}
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;
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exp : DEC '(' exp ',' exp ')'
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{ write_exp_elt_opcode(BINOP_ASSIGN_MODIFY);
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write_exp_elt_opcode(BINOP_SUB);
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write_exp_elt_opcode(BINOP_ASSIGN_MODIFY); }
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;
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exp : exp DOT NAME
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{ write_exp_elt_opcode (STRUCTOP_STRUCT);
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write_exp_string ($3);
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write_exp_elt_opcode (STRUCTOP_STRUCT); }
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;
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exp : set
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;
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exp : exp IN set
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{ error("Sets are not implemented.");}
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;
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exp : INCL '(' exp ',' exp ')'
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{ error("Sets are not implemented.");}
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;
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exp : EXCL '(' exp ',' exp ')'
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{ error("Sets are not implemented.");}
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set : '{' arglist '}'
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{ error("Sets are not implemented.");}
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| type '{' arglist '}'
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{ error("Sets are not implemented.");}
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;
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/* Modula-2 array subscript notation [a,b,c...] */
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exp : exp '['
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/* This function just saves the number of arguments
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that follow in the list. It is *not* specific to
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function types */
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{ start_arglist(); }
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non_empty_arglist ']' %prec DOT
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{ write_exp_elt_opcode (BINOP_MULTI_SUBSCRIPT);
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write_exp_elt_longcst ((LONGEST) end_arglist());
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write_exp_elt_opcode (BINOP_MULTI_SUBSCRIPT); }
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;
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exp : exp '('
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/* This is to save the value of arglist_len
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being accumulated by an outer function call. */
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{ start_arglist (); }
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arglist ')' %prec DOT
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{ write_exp_elt_opcode (OP_FUNCALL);
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write_exp_elt_longcst ((LONGEST) end_arglist ());
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write_exp_elt_opcode (OP_FUNCALL); }
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;
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arglist :
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;
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arglist : exp
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{ arglist_len = 1; }
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;
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arglist : arglist ',' exp %prec ABOVE_COMMA
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{ arglist_len++; }
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;
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non_empty_arglist
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: exp
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{ arglist_len = 1; }
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;
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non_empty_arglist
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: non_empty_arglist ',' exp %prec ABOVE_COMMA
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{ arglist_len++; }
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;
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/* GDB construct */
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exp : '{' type '}' exp %prec UNARY
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{ write_exp_elt_opcode (UNOP_MEMVAL);
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write_exp_elt_type ($2);
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write_exp_elt_opcode (UNOP_MEMVAL); }
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;
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exp : type '(' exp ')' %prec UNARY
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{ write_exp_elt_opcode (UNOP_CAST);
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write_exp_elt_type ($1);
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write_exp_elt_opcode (UNOP_CAST); }
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;
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exp : '(' exp ')'
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{ }
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;
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/* Binary operators in order of decreasing precedence. Note that some
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of these operators are overloaded! (ie. sets) */
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/* GDB construct */
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exp : exp '@' exp
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{ write_exp_elt_opcode (BINOP_REPEAT); }
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;
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exp : exp '*' exp
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{ write_exp_elt_opcode (BINOP_MUL); }
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;
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exp : exp '/' exp
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{ write_exp_elt_opcode (BINOP_DIV); }
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;
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exp : exp DIV exp
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{ write_exp_elt_opcode (BINOP_INTDIV); }
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;
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exp : exp MOD exp
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{ write_exp_elt_opcode (BINOP_REM); }
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;
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exp : exp '+' exp
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{ write_exp_elt_opcode (BINOP_ADD); }
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;
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exp : exp '-' exp
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{ write_exp_elt_opcode (BINOP_SUB); }
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;
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exp : exp '=' exp
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{ write_exp_elt_opcode (BINOP_EQUAL); }
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;
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exp : exp NOTEQUAL exp
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{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
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| exp '#' exp
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{ write_exp_elt_opcode (BINOP_NOTEQUAL); }
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;
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exp : exp LEQ exp
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{ write_exp_elt_opcode (BINOP_LEQ); }
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;
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exp : exp GEQ exp
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{ write_exp_elt_opcode (BINOP_GEQ); }
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;
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exp : exp '<' exp
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{ write_exp_elt_opcode (BINOP_LESS); }
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;
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exp : exp '>' exp
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{ write_exp_elt_opcode (BINOP_GTR); }
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;
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exp : exp AND exp
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{ write_exp_elt_opcode (BINOP_AND); }
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;
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exp : exp '&' exp
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{ write_exp_elt_opcode (BINOP_AND); }
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;
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exp : exp OR exp
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{ write_exp_elt_opcode (BINOP_OR); }
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;
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exp : exp ASSIGN exp
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{ write_exp_elt_opcode (BINOP_ASSIGN); }
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;
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/* Constants */
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exp : TRUE
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{ write_exp_elt_opcode (OP_BOOL);
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write_exp_elt_longcst ((LONGEST) $1);
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write_exp_elt_opcode (OP_BOOL); }
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;
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exp : FALSE
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{ write_exp_elt_opcode (OP_BOOL);
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write_exp_elt_longcst ((LONGEST) $1);
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write_exp_elt_opcode (OP_BOOL); }
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;
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exp : INT
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{ write_exp_elt_opcode (OP_LONG);
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write_exp_elt_type (builtin_type_m2_int);
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write_exp_elt_longcst ((LONGEST) $1);
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write_exp_elt_opcode (OP_LONG); }
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||
;
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||
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||
exp : UINT
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||
{
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write_exp_elt_opcode (OP_LONG);
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||
write_exp_elt_type (builtin_type_m2_card);
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write_exp_elt_longcst ((LONGEST) $1);
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||
write_exp_elt_opcode (OP_LONG);
|
||
}
|
||
;
|
||
|
||
exp : CHAR
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||
{ write_exp_elt_opcode (OP_LONG);
|
||
write_exp_elt_type (builtin_type_m2_char);
|
||
write_exp_elt_longcst ((LONGEST) $1);
|
||
write_exp_elt_opcode (OP_LONG); }
|
||
;
|
||
|
||
|
||
exp : FLOAT
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||
{ write_exp_elt_opcode (OP_DOUBLE);
|
||
write_exp_elt_type (builtin_type_m2_real);
|
||
write_exp_elt_dblcst ($1);
|
||
write_exp_elt_opcode (OP_DOUBLE); }
|
||
;
|
||
|
||
exp : variable
|
||
;
|
||
|
||
/* The GDB internal variable $$, et al. */
|
||
exp : LAST
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||
{ write_exp_elt_opcode (OP_LAST);
|
||
write_exp_elt_longcst ((LONGEST) $1);
|
||
write_exp_elt_opcode (OP_LAST); }
|
||
;
|
||
|
||
exp : REGNAME
|
||
{ write_exp_elt_opcode (OP_REGISTER);
|
||
write_exp_elt_longcst ((LONGEST) $1);
|
||
write_exp_elt_opcode (OP_REGISTER); }
|
||
;
|
||
|
||
exp : SIZE '(' type ')' %prec UNARY
|
||
{ write_exp_elt_opcode (OP_LONG);
|
||
write_exp_elt_type (builtin_type_int);
|
||
write_exp_elt_longcst ((LONGEST) TYPE_LENGTH ($3));
|
||
write_exp_elt_opcode (OP_LONG); }
|
||
;
|
||
|
||
exp : STRING
|
||
{ write_exp_elt_opcode (OP_M2_STRING);
|
||
write_exp_string ($1);
|
||
write_exp_elt_opcode (OP_M2_STRING); }
|
||
;
|
||
|
||
/* This will be used for extensions later. Like adding modules. */
|
||
block : fblock
|
||
{ $$ = SYMBOL_BLOCK_VALUE($1); }
|
||
;
|
||
|
||
fblock : BLOCKNAME
|
||
{ struct symbol *sym
|
||
= lookup_symbol (copy_name ($1), expression_context_block,
|
||
VAR_NAMESPACE, 0, NULL);
|
||
$$ = sym;}
|
||
;
|
||
|
||
|
||
/* GDB scope operator */
|
||
fblock : block COLONCOLON BLOCKNAME
|
||
{ struct symbol *tem
|
||
= lookup_symbol (copy_name ($3), $1,
|
||
VAR_NAMESPACE, 0, NULL);
|
||
if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
|
||
error ("No function \"%s\" in specified context.",
|
||
copy_name ($3));
|
||
$$ = tem;
|
||
}
|
||
;
|
||
|
||
/* Useful for assigning to PROCEDURE variables */
|
||
variable: fblock
|
||
{ write_exp_elt_opcode(OP_VAR_VALUE);
|
||
write_exp_elt_sym ($1);
|
||
write_exp_elt_opcode (OP_VAR_VALUE); }
|
||
;
|
||
|
||
/* GDB internal ($foo) variable */
|
||
variable: INTERNAL_VAR
|
||
{ write_exp_elt_opcode (OP_INTERNALVAR);
|
||
write_exp_elt_intern ($1);
|
||
write_exp_elt_opcode (OP_INTERNALVAR); }
|
||
;
|
||
|
||
/* GDB scope operator */
|
||
variable: block COLONCOLON NAME
|
||
{ struct symbol *sym;
|
||
sym = lookup_symbol (copy_name ($3), $1,
|
||
VAR_NAMESPACE, 0, NULL);
|
||
if (sym == 0)
|
||
error ("No symbol \"%s\" in specified context.",
|
||
copy_name ($3));
|
||
|
||
write_exp_elt_opcode (OP_VAR_VALUE);
|
||
write_exp_elt_sym (sym);
|
||
write_exp_elt_opcode (OP_VAR_VALUE); }
|
||
;
|
||
|
||
/* Base case for variables. */
|
||
variable: NAME
|
||
{ struct symbol *sym;
|
||
int is_a_field_of_this;
|
||
|
||
sym = lookup_symbol (copy_name ($1),
|
||
expression_context_block,
|
||
VAR_NAMESPACE,
|
||
&is_a_field_of_this,
|
||
NULL);
|
||
if (sym)
|
||
{
|
||
switch (sym->class)
|
||
{
|
||
case LOC_REGISTER:
|
||
case LOC_ARG:
|
||
case LOC_LOCAL:
|
||
case LOC_REF_ARG:
|
||
case LOC_REGPARM:
|
||
case LOC_LOCAL_ARG:
|
||
if (innermost_block == 0 ||
|
||
contained_in (block_found,
|
||
innermost_block))
|
||
innermost_block = block_found;
|
||
break;
|
||
|
||
case LOC_UNDEF:
|
||
case LOC_CONST:
|
||
case LOC_STATIC:
|
||
case LOC_TYPEDEF:
|
||
case LOC_LABEL: /* maybe should go above? */
|
||
case LOC_BLOCK:
|
||
case LOC_CONST_BYTES:
|
||
/* These are listed so gcc -Wall will reveal
|
||
un-handled cases. */
|
||
break;
|
||
}
|
||
write_exp_elt_opcode (OP_VAR_VALUE);
|
||
write_exp_elt_sym (sym);
|
||
write_exp_elt_opcode (OP_VAR_VALUE);
|
||
}
|
||
else
|
||
{
|
||
register int i;
|
||
register char *arg = copy_name ($1);
|
||
|
||
for (i = 0; i < misc_function_count; i++)
|
||
if (!strcmp (misc_function_vector[i].name, arg))
|
||
break;
|
||
|
||
if (i < misc_function_count)
|
||
{
|
||
enum misc_function_type mft =
|
||
(enum misc_function_type)
|
||
misc_function_vector[i].type;
|
||
|
||
write_exp_elt_opcode (OP_LONG);
|
||
write_exp_elt_type (builtin_type_int);
|
||
write_exp_elt_longcst ((LONGEST) misc_function_vector[i].address);
|
||
write_exp_elt_opcode (OP_LONG);
|
||
write_exp_elt_opcode (UNOP_MEMVAL);
|
||
if (mft == mf_data || mft == mf_bss)
|
||
write_exp_elt_type (builtin_type_int);
|
||
else if (mft == mf_text)
|
||
write_exp_elt_type (lookup_function_type (builtin_type_int));
|
||
else
|
||
write_exp_elt_type (builtin_type_char);
|
||
write_exp_elt_opcode (UNOP_MEMVAL);
|
||
}
|
||
else if (symtab_list == 0
|
||
&& partial_symtab_list == 0)
|
||
error ("No symbol table is loaded. Use the \"symbol-file\" command.");
|
||
else
|
||
error ("No symbol \"%s\" in current context.",
|
||
copy_name ($1));
|
||
}
|
||
}
|
||
;
|
||
|
||
type
|
||
: TYPENAME
|
||
{ $$ = lookup_typename (copy_name ($1),
|
||
expression_context_block, 0); }
|
||
|
||
;
|
||
|
||
%%
|
||
|
||
#if 0 /* FIXME! */
|
||
int
|
||
overflow(a,b)
|
||
long a,b;
|
||
{
|
||
return (MAX_OF_TYPE(builtin_type_m2_int) - b) < a;
|
||
}
|
||
|
||
int
|
||
uoverflow(a,b)
|
||
unsigned long a,b;
|
||
{
|
||
return (MAX_OF_TYPE(builtin_type_m2_card) - b) < a;
|
||
}
|
||
#endif /* FIXME */
|
||
|
||
/* Take care of parsing a number (anything that starts with a digit).
|
||
Set yylval and return the token type; update lexptr.
|
||
LEN is the number of characters in it. */
|
||
|
||
/*** Needs some error checking for the float case ***/
|
||
|
||
static int
|
||
parse_number (olen)
|
||
int olen;
|
||
{
|
||
register char *p = lexptr;
|
||
register LONGEST n = 0;
|
||
register LONGEST prevn = 0;
|
||
register int c,i,ischar=0;
|
||
register int base = input_radix;
|
||
register int len = olen;
|
||
int unsigned_p = number_sign == 1 ? 1 : 0;
|
||
|
||
extern double atof ();
|
||
|
||
if(p[len-1] == 'H')
|
||
{
|
||
base = 16;
|
||
len--;
|
||
}
|
||
else if(p[len-1] == 'C' || p[len-1] == 'B')
|
||
{
|
||
base = 8;
|
||
ischar = p[len-1] == 'C';
|
||
len--;
|
||
}
|
||
|
||
/* Scan the number */
|
||
for (c = 0; c < len; c++)
|
||
{
|
||
if (p[c] == '.' && base == 10)
|
||
{
|
||
/* It's a float since it contains a point. */
|
||
yylval.dval = atof (p);
|
||
lexptr += len;
|
||
return FLOAT;
|
||
}
|
||
if (p[c] == '.' && base != 10)
|
||
error("Floating point numbers must be base 10.");
|
||
if (base == 10 && (p[c] < '0' || p[c] > '9'))
|
||
error("Invalid digit \'%c\' in number.",p[c]);
|
||
}
|
||
|
||
while (len-- > 0)
|
||
{
|
||
c = *p++;
|
||
n *= base;
|
||
if( base == 8 && (c == '8' || c == '9'))
|
||
error("Invalid digit \'%c\' in octal number.",c);
|
||
if (c >= '0' && c <= '9')
|
||
i = c - '0';
|
||
else
|
||
{
|
||
if (base == 16 && c >= 'A' && c <= 'F')
|
||
i = c - 'A' + 10;
|
||
else
|
||
return ERROR;
|
||
}
|
||
n+=i;
|
||
if(i >= base)
|
||
return ERROR;
|
||
if(!unsigned_p && number_sign == 1 && (prevn >= n))
|
||
unsigned_p=1; /* Try something unsigned */
|
||
/* Don't do the range check if n==i and i==0, since that special
|
||
case will give an overflow error. */
|
||
if(RANGE_CHECK && n!=i && i)
|
||
{
|
||
if((unsigned_p && (unsigned)prevn >= (unsigned)n) ||
|
||
((!unsigned_p && number_sign==-1) && -prevn <= -n))
|
||
range_error("Overflow on numeric constant.");
|
||
}
|
||
prevn=n;
|
||
}
|
||
|
||
lexptr = p;
|
||
if(*p == 'B' || *p == 'C' || *p == 'H')
|
||
lexptr++; /* Advance past B,C or H */
|
||
|
||
if (ischar)
|
||
{
|
||
yylval.ulval = n;
|
||
return CHAR;
|
||
}
|
||
else if ( unsigned_p && number_sign == 1)
|
||
{
|
||
yylval.ulval = n;
|
||
return UINT;
|
||
}
|
||
else if((unsigned_p && (n<0))) {
|
||
range_error("Overflow on numeric constant -- number too large.");
|
||
/* But, this can return if range_check == range_warn. */
|
||
}
|
||
yylval.lval = n;
|
||
return INT;
|
||
}
|
||
|
||
|
||
/* Some tokens */
|
||
|
||
static struct
|
||
{
|
||
char name[2];
|
||
int token;
|
||
} tokentab2[] =
|
||
{
|
||
{"<>", NOTEQUAL },
|
||
{":=", ASSIGN },
|
||
{"<=", LEQ },
|
||
{">=", GEQ },
|
||
{"::", COLONCOLON },
|
||
|
||
};
|
||
|
||
/* Some specific keywords */
|
||
|
||
struct keyword {
|
||
char keyw[10];
|
||
int token;
|
||
};
|
||
|
||
static struct keyword keytab[] =
|
||
{
|
||
{"OR" , OR },
|
||
{"IN", IN },/* Note space after IN */
|
||
{"AND", AND },
|
||
{"ABS", ABS },
|
||
{"CHR", CHR },
|
||
{"DEC", DEC },
|
||
{"NOT", NOT },
|
||
{"DIV", DIV },
|
||
{"INC", INC },
|
||
{"MAX", MAX_FUNC },
|
||
{"MIN", MIN_FUNC },
|
||
{"MOD", MOD },
|
||
{"ODD", ODD },
|
||
{"CAP", CAP },
|
||
{"ORD", ORD },
|
||
{"VAL", VAL },
|
||
{"EXCL", EXCL },
|
||
{"HIGH", HIGH },
|
||
{"INCL", INCL },
|
||
{"SIZE", SIZE },
|
||
{"FLOAT", FLOAT_FUNC },
|
||
{"TRUNC", TRUNC },
|
||
};
|
||
|
||
|
||
/* Read one token, getting characters through lexptr. */
|
||
|
||
/* This is where we will check to make sure that the language and the operators used are
|
||
compatible */
|
||
|
||
static int
|
||
yylex ()
|
||
{
|
||
register int c;
|
||
register int namelen;
|
||
register int i;
|
||
register char *tokstart;
|
||
register char quote;
|
||
|
||
retry:
|
||
|
||
tokstart = lexptr;
|
||
|
||
|
||
/* See if it is a special token of length 2 */
|
||
for( i = 0 ; i < sizeof tokentab2 / sizeof tokentab2[0] ; i++)
|
||
if(!strncmp(tokentab2[i].name, tokstart, 2))
|
||
{
|
||
lexptr += 2;
|
||
return tokentab2[i].token;
|
||
}
|
||
|
||
switch (c = *tokstart)
|
||
{
|
||
case 0:
|
||
return 0;
|
||
|
||
case ' ':
|
||
case '\t':
|
||
case '\n':
|
||
lexptr++;
|
||
goto retry;
|
||
|
||
case '(':
|
||
paren_depth++;
|
||
lexptr++;
|
||
return c;
|
||
|
||
case ')':
|
||
if (paren_depth == 0)
|
||
return 0;
|
||
paren_depth--;
|
||
lexptr++;
|
||
return c;
|
||
|
||
case ',':
|
||
if (comma_terminates && paren_depth == 0)
|
||
return 0;
|
||
lexptr++;
|
||
return c;
|
||
|
||
case '.':
|
||
/* Might be a floating point number. */
|
||
if (lexptr[1] >= '0' && lexptr[1] <= '9')
|
||
break; /* Falls into number code. */
|
||
else
|
||
{
|
||
lexptr++;
|
||
return DOT;
|
||
}
|
||
|
||
/* These are character tokens that appear as-is in the YACC grammar */
|
||
case '+':
|
||
case '-':
|
||
case '*':
|
||
case '/':
|
||
case '^':
|
||
case '<':
|
||
case '>':
|
||
case '[':
|
||
case ']':
|
||
case '=':
|
||
case '{':
|
||
case '}':
|
||
case '#':
|
||
case '@':
|
||
case '~':
|
||
case '&':
|
||
lexptr++;
|
||
return c;
|
||
|
||
case '\'' :
|
||
case '"':
|
||
quote = c;
|
||
for (namelen = 1; (c = tokstart[namelen]) != quote && c != '\0'; namelen++)
|
||
if (c == '\\')
|
||
{
|
||
c = tokstart[++namelen];
|
||
if (c >= '0' && c <= '9')
|
||
{
|
||
c = tokstart[++namelen];
|
||
if (c >= '0' && c <= '9')
|
||
c = tokstart[++namelen];
|
||
}
|
||
}
|
||
if(c != quote)
|
||
error("Unterminated string or character constant.");
|
||
yylval.sval.ptr = tokstart + 1;
|
||
yylval.sval.length = namelen - 1;
|
||
lexptr += namelen + 1;
|
||
|
||
if(namelen == 2) /* Single character */
|
||
{
|
||
yylval.ulval = tokstart[1];
|
||
return CHAR;
|
||
}
|
||
else
|
||
return STRING;
|
||
}
|
||
|
||
/* Is it a number? */
|
||
/* Note: We have already dealt with the case of the token '.'.
|
||
See case '.' above. */
|
||
if ((c >= '0' && c <= '9'))
|
||
{
|
||
/* It's a number. */
|
||
int got_dot = 0, got_e = 0;
|
||
register char *p = tokstart;
|
||
int toktype;
|
||
|
||
for (++p ;; ++p)
|
||
{
|
||
if (!got_e && (*p == 'e' || *p == 'E'))
|
||
got_dot = got_e = 1;
|
||
else if (!got_dot && *p == '.')
|
||
got_dot = 1;
|
||
else if (got_e && (p[-1] == 'e' || p[-1] == 'E')
|
||
&& (*p == '-' || *p == '+'))
|
||
/* This is the sign of the exponent, not the end of the
|
||
number. */
|
||
continue;
|
||
else if ((*p < '0' || *p > '9') &&
|
||
(*p < 'A' || *p > 'F') &&
|
||
(*p != 'H')) /* Modula-2 hexadecimal number */
|
||
break;
|
||
}
|
||
toktype = parse_number (p - tokstart);
|
||
if (toktype == ERROR)
|
||
{
|
||
char *err_copy = (char *) alloca (p - tokstart + 1);
|
||
|
||
bcopy (tokstart, err_copy, p - tokstart);
|
||
err_copy[p - tokstart] = 0;
|
||
error ("Invalid number \"%s\".", err_copy);
|
||
}
|
||
lexptr = p;
|
||
return toktype;
|
||
}
|
||
|
||
if (!(c == '_' || c == '$'
|
||
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')))
|
||
/* We must have come across a bad character (e.g. ';'). */
|
||
error ("Invalid character '%c' in expression.", c);
|
||
|
||
/* It's a name. See how long it is. */
|
||
namelen = 0;
|
||
for (c = tokstart[namelen];
|
||
(c == '_' || c == '$' || (c >= '0' && c <= '9')
|
||
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
|
||
c = tokstart[++namelen])
|
||
;
|
||
|
||
/* The token "if" terminates the expression and is NOT
|
||
removed from the input stream. */
|
||
if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
lexptr += namelen;
|
||
|
||
/* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
|
||
and $$digits (equivalent to $<-digits> if you could type that).
|
||
Make token type LAST, and put the number (the digits) in yylval. */
|
||
|
||
if (*tokstart == '$')
|
||
{
|
||
register int negate = 0;
|
||
c = 1;
|
||
/* Double dollar means negate the number and add -1 as well.
|
||
Thus $$ alone means -1. */
|
||
if (namelen >= 2 && tokstart[1] == '$')
|
||
{
|
||
negate = 1;
|
||
c = 2;
|
||
}
|
||
if (c == namelen)
|
||
{
|
||
/* Just dollars (one or two) */
|
||
yylval.lval = - negate;
|
||
return LAST;
|
||
}
|
||
/* Is the rest of the token digits? */
|
||
for (; c < namelen; c++)
|
||
if (!(tokstart[c] >= '0' && tokstart[c] <= '9'))
|
||
break;
|
||
if (c == namelen)
|
||
{
|
||
yylval.lval = atoi (tokstart + 1 + negate);
|
||
if (negate)
|
||
yylval.lval = - yylval.lval;
|
||
return LAST;
|
||
}
|
||
}
|
||
|
||
/* Handle tokens that refer to machine registers:
|
||
$ followed by a register name. */
|
||
|
||
if (*tokstart == '$') {
|
||
for (c = 0; c < NUM_REGS; c++)
|
||
if (namelen - 1 == strlen (reg_names[c])
|
||
&& !strncmp (tokstart + 1, reg_names[c], namelen - 1))
|
||
{
|
||
yylval.lval = c;
|
||
return REGNAME;
|
||
}
|
||
for (c = 0; c < num_std_regs; c++)
|
||
if (namelen - 1 == strlen (std_regs[c].name)
|
||
&& !strncmp (tokstart + 1, std_regs[c].name, namelen - 1))
|
||
{
|
||
yylval.lval = std_regs[c].regnum;
|
||
return REGNAME;
|
||
}
|
||
}
|
||
|
||
|
||
/* Lookup special keywords */
|
||
for(i = 0 ; i < sizeof(keytab) / sizeof(keytab[0]) ; i++)
|
||
if(namelen == strlen(keytab[i].keyw) && !strncmp(tokstart,keytab[i].keyw,namelen))
|
||
return keytab[i].token;
|
||
|
||
yylval.sval.ptr = tokstart;
|
||
yylval.sval.length = namelen;
|
||
|
||
/* Any other names starting in $ are debugger internal variables. */
|
||
|
||
if (*tokstart == '$')
|
||
{
|
||
yylval.ivar = (struct internalvar *) lookup_internalvar (copy_name (yylval.sval) + 1);
|
||
return INTERNAL_VAR;
|
||
}
|
||
|
||
|
||
/* Use token-type BLOCKNAME for symbols that happen to be defined as
|
||
functions. If this is not so, then ...
|
||
Use token-type TYPENAME for symbols that happen to be defined
|
||
currently as names of types; NAME for other symbols.
|
||
The caller is not constrained to care about the distinction. */
|
||
{
|
||
|
||
|
||
char *tmp = copy_name (yylval.sval);
|
||
struct symbol *sym;
|
||
|
||
if (lookup_partial_symtab (tmp))
|
||
return BLOCKNAME;
|
||
sym = lookup_symbol (tmp, expression_context_block,
|
||
VAR_NAMESPACE, 0, NULL);
|
||
if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
|
||
return BLOCKNAME;
|
||
if (lookup_typename (copy_name (yylval.sval), expression_context_block, 1))
|
||
return TYPENAME;
|
||
|
||
if(sym)
|
||
{
|
||
switch(sym->class)
|
||
{
|
||
case LOC_STATIC:
|
||
case LOC_REGISTER:
|
||
case LOC_ARG:
|
||
case LOC_REF_ARG:
|
||
case LOC_REGPARM:
|
||
case LOC_LOCAL:
|
||
case LOC_LOCAL_ARG:
|
||
case LOC_CONST:
|
||
case LOC_CONST_BYTES:
|
||
return NAME;
|
||
|
||
case LOC_TYPEDEF:
|
||
return TYPENAME;
|
||
|
||
case LOC_BLOCK:
|
||
return BLOCKNAME;
|
||
|
||
case LOC_UNDEF:
|
||
error("internal: Undefined class in m2lex()");
|
||
|
||
case LOC_LABEL:
|
||
error("internal: Unforseen case in m2lex()");
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Built-in BOOLEAN type. This is sort of a hack. */
|
||
if(!strncmp(tokstart,"TRUE",4))
|
||
{
|
||
yylval.ulval = 1;
|
||
return TRUE;
|
||
}
|
||
else if(!strncmp(tokstart,"FALSE",5))
|
||
{
|
||
yylval.ulval = 0;
|
||
return FALSE;
|
||
}
|
||
}
|
||
|
||
/* Must be another type of name... */
|
||
return NAME;
|
||
}
|
||
}
|
||
|
||
char *
|
||
make_qualname(mod,ident)
|
||
char *mod, *ident;
|
||
{
|
||
char *new = xmalloc(strlen(mod)+strlen(ident)+2);
|
||
|
||
strcpy(new,mod);
|
||
strcat(new,".");
|
||
strcat(new,ident);
|
||
return new;
|
||
}
|
||
|
||
|
||
void
|
||
yyerror()
|
||
{
|
||
printf("Parsing: %s\n",lexptr);
|
||
if (yychar < 256)
|
||
error("Invalid syntax in expression near character '%c'.",yychar);
|
||
else
|
||
error("Invalid syntax in expression");
|
||
}
|
||
|
||
/* Table of operators and their precedences for printing expressions. */
|
||
|
||
const static struct op_print m2_op_print_tab[] = {
|
||
{"+", BINOP_ADD, PREC_ADD, 0},
|
||
{"+", UNOP_PLUS, PREC_PREFIX, 0},
|
||
{"-", BINOP_SUB, PREC_ADD, 0},
|
||
{"-", UNOP_NEG, PREC_PREFIX, 0},
|
||
{"*", BINOP_MUL, PREC_MUL, 0},
|
||
{"/", BINOP_DIV, PREC_MUL, 0},
|
||
{"DIV", BINOP_INTDIV, PREC_MUL, 0},
|
||
{"MOD", BINOP_REM, PREC_MUL, 0},
|
||
{":=", BINOP_ASSIGN, PREC_ASSIGN, 1},
|
||
{"OR", BINOP_OR, PREC_OR, 0},
|
||
{"AND", BINOP_AND, PREC_AND, 0},
|
||
{"NOT", UNOP_ZEROP, PREC_PREFIX, 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},
|
||
{"^", UNOP_IND, PREC_PREFIX, 0},
|
||
{"@", BINOP_REPEAT, PREC_REPEAT, 0},
|
||
};
|
||
|
||
/* The built-in types of Modula-2. */
|
||
|
||
struct type *builtin_type_m2_char;
|
||
struct type *builtin_type_m2_int;
|
||
struct type *builtin_type_m2_card;
|
||
struct type *builtin_type_m2_real;
|
||
struct type *builtin_type_m2_bool;
|
||
|
||
struct type ** const (m2_builtin_types[]) =
|
||
{
|
||
&builtin_type_m2_char,
|
||
&builtin_type_m2_int,
|
||
&builtin_type_m2_card,
|
||
&builtin_type_m2_real,
|
||
&builtin_type_m2_bool,
|
||
0
|
||
};
|
||
|
||
const struct language_defn m2_language_defn = {
|
||
"modula-2",
|
||
language_m2,
|
||
m2_builtin_types,
|
||
range_check_on,
|
||
type_check_on,
|
||
m2_parse, /* parser */
|
||
m2_error, /* parser error function */
|
||
&builtin_type_m2_int, /* longest signed integral type */
|
||
&builtin_type_m2_card, /* longest unsigned integral type */
|
||
&builtin_type_m2_real, /* longest floating point type */
|
||
"0%XH", "0%", "XH", /* Hex format string, prefix, suffix */
|
||
"%oB", "%", "oB", /* Octal format string, prefix, suffix */
|
||
m2_op_print_tab, /* expression operators for printing */
|
||
LANG_MAGIC
|
||
};
|
||
|
||
/* Initialization for Modula-2 */
|
||
|
||
void
|
||
_initialize_m2_exp ()
|
||
{
|
||
/* FIXME: The code below assumes that the sizes of the basic data
|
||
types are the same on the host and target machines!!! */
|
||
|
||
/* Modula-2 "pervasive" types. NOTE: these can be redefined!!! */
|
||
builtin_type_m2_int = init_type (TYPE_CODE_INT, sizeof(int), 0, "INTEGER");
|
||
builtin_type_m2_card = init_type (TYPE_CODE_INT, sizeof(int), 1, "CARDINAL");
|
||
builtin_type_m2_real = init_type (TYPE_CODE_FLT, sizeof(float), 0, "REAL");
|
||
builtin_type_m2_char = init_type (TYPE_CODE_CHAR, sizeof(char), 1, "CHAR");
|
||
|
||
builtin_type_m2_bool = init_type (TYPE_CODE_BOOL, sizeof(int), 1, "BOOLEAN");
|
||
TYPE_NFIELDS(builtin_type_m2_bool) = 2;
|
||
TYPE_FIELDS(builtin_type_m2_bool) =
|
||
(struct field *) malloc (sizeof (struct field) * 2);
|
||
TYPE_FIELD_BITPOS(builtin_type_m2_bool,0) = 0;
|
||
TYPE_FIELD_NAME(builtin_type_m2_bool,0) = (char *)malloc(6);
|
||
strcpy(TYPE_FIELD_NAME(builtin_type_m2_bool,0),"FALSE");
|
||
TYPE_FIELD_BITPOS(builtin_type_m2_bool,1) = 1;
|
||
TYPE_FIELD_NAME(builtin_type_m2_bool,1) = (char *)malloc(5);
|
||
strcpy(TYPE_FIELD_NAME(builtin_type_m2_bool,1),"TRUE");
|
||
|
||
add_language (&m2_language_defn);
|
||
}
|