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https://sourceware.org/git/binutils-gdb.git
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1054 lines
25 KiB
Plaintext
1054 lines
25 KiB
Plaintext
/* YACC grammar for Modula-2 expressions, for GDB.
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Copyright (C) 1986-2020 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 3 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, see <http://www.gnu.org/licenses/>. */
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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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Note that malloc's and realloc's in this file are transformed to
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xmalloc and xrealloc respectively by the same sed command in the
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makefile that remaps any other malloc/realloc inserted by the parser
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generator. Doing this with #defines and trying to control the interaction
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with include files (<malloc.h> and <stdlib.h> for example) just became
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too messy, particularly when such includes can be inserted at random
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times by the parser generator. */
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%{
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#include "defs.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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#include "m2-lang.h"
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#include "bfd.h" /* Required by objfiles.h. */
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#include "symfile.h" /* Required by objfiles.h. */
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#include "objfiles.h" /* For have_full_symbols and have_partial_symbols */
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#include "block.h"
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#define parse_type(ps) builtin_type (ps->gdbarch ())
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#define parse_m2_type(ps) builtin_m2_type (ps->gdbarch ())
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/* Remap normal yacc parser interface names (yyparse, yylex, yyerror,
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etc). */
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#define GDB_YY_REMAP_PREFIX m2_
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#include "yy-remap.h"
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/* The state of the parser, used internally when we are parsing the
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expression. */
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static struct parser_state *pstate = NULL;
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int yyparse (void);
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static int yylex (void);
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static void yyerror (const char *);
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static int parse_number (int);
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/* The sign of the number being parsed. */
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static int number_sign = 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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ULONGEST ulval;
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gdb_byte val[16];
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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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const 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 M2_TRUE M2_FALSE CHAR
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%token <val> 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 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 TSIZE
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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 <voidval> DOLLAR_VARIABLE
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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 OROR
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%left LOGICAL_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 (pstate, OP_TYPE);
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write_exp_elt_type (pstate, $1);
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write_exp_elt_opcode (pstate, 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 (pstate, UNOP_IND); }
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;
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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 (pstate, UNOP_NEG); }
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;
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exp : '+' exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_PLUS); }
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;
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exp : not_exp exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_LOGICAL_NOT); }
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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 (pstate, UNOP_CAP); }
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;
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exp : ORD '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_ORD); }
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;
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exp : ABS '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_ABS); }
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;
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exp : HIGH '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_HIGH); }
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;
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exp : MIN_FUNC '(' type ')'
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{ write_exp_elt_opcode (pstate, UNOP_MIN);
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write_exp_elt_type (pstate, $3);
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write_exp_elt_opcode (pstate, UNOP_MIN); }
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;
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exp : MAX_FUNC '(' type ')'
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{ write_exp_elt_opcode (pstate, UNOP_MAX);
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write_exp_elt_type (pstate, $3);
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write_exp_elt_opcode (pstate, UNOP_MAX); }
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;
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exp : FLOAT_FUNC '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_FLOAT); }
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;
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exp : VAL '(' type ',' exp ')'
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{ write_exp_elt_opcode (pstate, BINOP_VAL);
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write_exp_elt_type (pstate, $3);
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write_exp_elt_opcode (pstate, BINOP_VAL); }
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;
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exp : CHR '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_CHR); }
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;
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exp : ODD '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_ODD); }
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;
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exp : TRUNC '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_TRUNC); }
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;
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exp : TSIZE '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
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;
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exp : SIZE exp %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_SIZEOF); }
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;
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exp : INC '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_PREINCREMENT); }
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;
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exp : INC '(' exp ',' exp ')'
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{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
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write_exp_elt_opcode (pstate, BINOP_ADD);
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write_exp_elt_opcode (pstate,
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BINOP_ASSIGN_MODIFY); }
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;
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exp : DEC '(' exp ')'
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{ write_exp_elt_opcode (pstate, UNOP_PREDECREMENT);}
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;
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exp : DEC '(' exp ',' exp ')'
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{ write_exp_elt_opcode (pstate, BINOP_ASSIGN_MODIFY);
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write_exp_elt_opcode (pstate, BINOP_SUB);
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write_exp_elt_opcode (pstate,
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BINOP_ASSIGN_MODIFY); }
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;
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exp : exp DOT NAME
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{ write_exp_elt_opcode (pstate, STRUCTOP_STRUCT);
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write_exp_string (pstate, $3);
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write_exp_elt_opcode (pstate, 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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;
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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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{ pstate->start_arglist(); }
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non_empty_arglist ']' %prec DOT
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{ write_exp_elt_opcode (pstate, MULTI_SUBSCRIPT);
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write_exp_elt_longcst (pstate,
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pstate->end_arglist());
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write_exp_elt_opcode (pstate, MULTI_SUBSCRIPT); }
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;
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exp : exp '[' exp ']'
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{ write_exp_elt_opcode (pstate, BINOP_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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{ pstate->start_arglist (); }
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arglist ')' %prec DOT
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{ write_exp_elt_opcode (pstate, OP_FUNCALL);
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write_exp_elt_longcst (pstate,
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pstate->end_arglist ());
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write_exp_elt_opcode (pstate, 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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{ pstate->arglist_len = 1; }
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;
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arglist : arglist ',' exp %prec ABOVE_COMMA
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{ pstate->arglist_len++; }
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;
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non_empty_arglist
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: exp
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{ pstate->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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{ pstate->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 (pstate, UNOP_MEMVAL);
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write_exp_elt_type (pstate, $2);
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write_exp_elt_opcode (pstate, UNOP_MEMVAL); }
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;
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exp : type '(' exp ')' %prec UNARY
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{ write_exp_elt_opcode (pstate, UNOP_CAST);
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write_exp_elt_type (pstate, $1);
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write_exp_elt_opcode (pstate, 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 (pstate, BINOP_REPEAT); }
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;
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exp : exp '*' exp
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{ write_exp_elt_opcode (pstate, BINOP_MUL); }
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;
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exp : exp '/' exp
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{ write_exp_elt_opcode (pstate, BINOP_DIV); }
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;
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exp : exp DIV exp
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{ write_exp_elt_opcode (pstate, BINOP_INTDIV); }
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;
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exp : exp MOD exp
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{ write_exp_elt_opcode (pstate, BINOP_REM); }
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;
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exp : exp '+' exp
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{ write_exp_elt_opcode (pstate, BINOP_ADD); }
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;
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exp : exp '-' exp
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{ write_exp_elt_opcode (pstate, BINOP_SUB); }
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;
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exp : exp '=' exp
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{ write_exp_elt_opcode (pstate, BINOP_EQUAL); }
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;
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exp : exp NOTEQUAL exp
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{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
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| exp '#' exp
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{ write_exp_elt_opcode (pstate, BINOP_NOTEQUAL); }
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;
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exp : exp LEQ exp
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{ write_exp_elt_opcode (pstate, BINOP_LEQ); }
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;
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exp : exp GEQ exp
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{ write_exp_elt_opcode (pstate, BINOP_GEQ); }
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;
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exp : exp '<' exp
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{ write_exp_elt_opcode (pstate, BINOP_LESS); }
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;
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exp : exp '>' exp
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{ write_exp_elt_opcode (pstate, BINOP_GTR); }
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;
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exp : exp LOGICAL_AND exp
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{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_AND); }
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;
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exp : exp OROR exp
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{ write_exp_elt_opcode (pstate, BINOP_LOGICAL_OR); }
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||
;
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||
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exp : exp ASSIGN exp
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{ write_exp_elt_opcode (pstate, BINOP_ASSIGN); }
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;
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||
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/* Constants */
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exp : M2_TRUE
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{ write_exp_elt_opcode (pstate, OP_BOOL);
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write_exp_elt_longcst (pstate, (LONGEST) $1);
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write_exp_elt_opcode (pstate, OP_BOOL); }
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||
;
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||
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||
exp : M2_FALSE
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||
{ write_exp_elt_opcode (pstate, OP_BOOL);
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write_exp_elt_longcst (pstate, (LONGEST) $1);
|
||
write_exp_elt_opcode (pstate, OP_BOOL); }
|
||
;
|
||
|
||
exp : INT
|
||
{ write_exp_elt_opcode (pstate, OP_LONG);
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||
write_exp_elt_type (pstate,
|
||
parse_m2_type (pstate)->builtin_int);
|
||
write_exp_elt_longcst (pstate, (LONGEST) $1);
|
||
write_exp_elt_opcode (pstate, OP_LONG); }
|
||
;
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||
|
||
exp : UINT
|
||
{
|
||
write_exp_elt_opcode (pstate, OP_LONG);
|
||
write_exp_elt_type (pstate,
|
||
parse_m2_type (pstate)
|
||
->builtin_card);
|
||
write_exp_elt_longcst (pstate, (LONGEST) $1);
|
||
write_exp_elt_opcode (pstate, OP_LONG);
|
||
}
|
||
;
|
||
|
||
exp : CHAR
|
||
{ write_exp_elt_opcode (pstate, OP_LONG);
|
||
write_exp_elt_type (pstate,
|
||
parse_m2_type (pstate)
|
||
->builtin_char);
|
||
write_exp_elt_longcst (pstate, (LONGEST) $1);
|
||
write_exp_elt_opcode (pstate, OP_LONG); }
|
||
;
|
||
|
||
|
||
exp : FLOAT
|
||
{ write_exp_elt_opcode (pstate, OP_FLOAT);
|
||
write_exp_elt_type (pstate,
|
||
parse_m2_type (pstate)
|
||
->builtin_real);
|
||
write_exp_elt_floatcst (pstate, $1);
|
||
write_exp_elt_opcode (pstate, OP_FLOAT); }
|
||
;
|
||
|
||
exp : variable
|
||
;
|
||
|
||
exp : SIZE '(' type ')' %prec UNARY
|
||
{ write_exp_elt_opcode (pstate, OP_LONG);
|
||
write_exp_elt_type (pstate,
|
||
parse_type (pstate)->builtin_int);
|
||
write_exp_elt_longcst (pstate,
|
||
(LONGEST) TYPE_LENGTH ($3));
|
||
write_exp_elt_opcode (pstate, OP_LONG); }
|
||
;
|
||
|
||
exp : STRING
|
||
{ write_exp_elt_opcode (pstate, OP_M2_STRING);
|
||
write_exp_string (pstate, $1);
|
||
write_exp_elt_opcode (pstate, OP_M2_STRING); }
|
||
;
|
||
|
||
/* This will be used for extensions later. Like adding modules. */
|
||
block : fblock
|
||
{ $$ = SYMBOL_BLOCK_VALUE($1); }
|
||
;
|
||
|
||
fblock : BLOCKNAME
|
||
{ struct symbol *sym
|
||
= lookup_symbol (copy_name ($1).c_str (),
|
||
pstate->expression_context_block,
|
||
VAR_DOMAIN, 0).symbol;
|
||
$$ = sym;}
|
||
;
|
||
|
||
|
||
/* GDB scope operator */
|
||
fblock : block COLONCOLON BLOCKNAME
|
||
{ struct symbol *tem
|
||
= lookup_symbol (copy_name ($3).c_str (), $1,
|
||
VAR_DOMAIN, 0).symbol;
|
||
if (!tem || SYMBOL_CLASS (tem) != LOC_BLOCK)
|
||
error (_("No function \"%s\" in specified context."),
|
||
copy_name ($3).c_str ());
|
||
$$ = tem;
|
||
}
|
||
;
|
||
|
||
/* Useful for assigning to PROCEDURE variables */
|
||
variable: fblock
|
||
{ write_exp_elt_opcode (pstate, OP_VAR_VALUE);
|
||
write_exp_elt_block (pstate, NULL);
|
||
write_exp_elt_sym (pstate, $1);
|
||
write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
|
||
;
|
||
|
||
/* GDB internal ($foo) variable */
|
||
variable: DOLLAR_VARIABLE
|
||
;
|
||
|
||
/* GDB scope operator */
|
||
variable: block COLONCOLON NAME
|
||
{ struct block_symbol sym
|
||
= lookup_symbol (copy_name ($3).c_str (), $1,
|
||
VAR_DOMAIN, 0);
|
||
|
||
if (sym.symbol == 0)
|
||
error (_("No symbol \"%s\" in specified context."),
|
||
copy_name ($3).c_str ());
|
||
if (symbol_read_needs_frame (sym.symbol))
|
||
pstate->block_tracker->update (sym);
|
||
|
||
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
|
||
write_exp_elt_block (pstate, sym.block);
|
||
write_exp_elt_sym (pstate, sym.symbol);
|
||
write_exp_elt_opcode (pstate, OP_VAR_VALUE); }
|
||
;
|
||
|
||
/* Base case for variables. */
|
||
variable: NAME
|
||
{ struct block_symbol sym;
|
||
struct field_of_this_result is_a_field_of_this;
|
||
|
||
sym
|
||
= lookup_symbol (copy_name ($1).c_str (),
|
||
pstate->expression_context_block,
|
||
VAR_DOMAIN,
|
||
&is_a_field_of_this);
|
||
|
||
if (sym.symbol)
|
||
{
|
||
if (symbol_read_needs_frame (sym.symbol))
|
||
pstate->block_tracker->update (sym);
|
||
|
||
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
|
||
write_exp_elt_block (pstate, sym.block);
|
||
write_exp_elt_sym (pstate, sym.symbol);
|
||
write_exp_elt_opcode (pstate, OP_VAR_VALUE);
|
||
}
|
||
else
|
||
{
|
||
struct bound_minimal_symbol msymbol;
|
||
std::string arg = copy_name ($1);
|
||
|
||
msymbol =
|
||
lookup_bound_minimal_symbol (arg.c_str ());
|
||
if (msymbol.minsym != NULL)
|
||
write_exp_msymbol (pstate, msymbol);
|
||
else if (!have_full_symbols () && !have_partial_symbols ())
|
||
error (_("No symbol table is loaded. Use the \"symbol-file\" command."));
|
||
else
|
||
error (_("No symbol \"%s\" in current context."),
|
||
arg.c_str ());
|
||
}
|
||
}
|
||
;
|
||
|
||
type
|
||
: TYPENAME
|
||
{ $$
|
||
= lookup_typename (pstate->language (),
|
||
copy_name ($1).c_str (),
|
||
pstate->expression_context_block,
|
||
0);
|
||
}
|
||
|
||
;
|
||
|
||
%%
|
||
|
||
/* 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 (int olen)
|
||
{
|
||
const char *p = pstate->lexptr;
|
||
LONGEST n = 0;
|
||
LONGEST prevn = 0;
|
||
int c,i,ischar=0;
|
||
int base = input_radix;
|
||
int len = olen;
|
||
int unsigned_p = number_sign == 1 ? 1 : 0;
|
||
|
||
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. */
|
||
if (!parse_float (p, len,
|
||
parse_m2_type (pstate)->builtin_real,
|
||
yylval.val))
|
||
return ERROR;
|
||
|
||
pstate->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;
|
||
}
|
||
|
||
pstate->lexptr = p;
|
||
if(*p == 'B' || *p == 'C' || *p == 'H')
|
||
pstate->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" , OROR },
|
||
{"IN", IN },/* Note space after IN */
|
||
{"AND", LOGICAL_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 },
|
||
{"TSIZE", SIZE },
|
||
};
|
||
|
||
|
||
/* Depth of parentheses. */
|
||
static int paren_depth;
|
||
|
||
/* 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 (void)
|
||
{
|
||
int c;
|
||
int namelen;
|
||
int i;
|
||
const char *tokstart;
|
||
char quote;
|
||
|
||
retry:
|
||
|
||
pstate->prev_lexptr = pstate->lexptr;
|
||
|
||
tokstart = pstate->lexptr;
|
||
|
||
|
||
/* See if it is a special token of length 2 */
|
||
for( i = 0 ; i < (int) (sizeof tokentab2 / sizeof tokentab2[0]) ; i++)
|
||
if (strncmp (tokentab2[i].name, tokstart, 2) == 0)
|
||
{
|
||
pstate->lexptr += 2;
|
||
return tokentab2[i].token;
|
||
}
|
||
|
||
switch (c = *tokstart)
|
||
{
|
||
case 0:
|
||
return 0;
|
||
|
||
case ' ':
|
||
case '\t':
|
||
case '\n':
|
||
pstate->lexptr++;
|
||
goto retry;
|
||
|
||
case '(':
|
||
paren_depth++;
|
||
pstate->lexptr++;
|
||
return c;
|
||
|
||
case ')':
|
||
if (paren_depth == 0)
|
||
return 0;
|
||
paren_depth--;
|
||
pstate->lexptr++;
|
||
return c;
|
||
|
||
case ',':
|
||
if (pstate->comma_terminates && paren_depth == 0)
|
||
return 0;
|
||
pstate->lexptr++;
|
||
return c;
|
||
|
||
case '.':
|
||
/* Might be a floating point number. */
|
||
if (pstate->lexptr[1] >= '0' && pstate->lexptr[1] <= '9')
|
||
break; /* Falls into number code. */
|
||
else
|
||
{
|
||
pstate->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 '&':
|
||
pstate->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;
|
||
pstate->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;
|
||
const 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);
|
||
|
||
memcpy (err_copy, tokstart, p - tokstart);
|
||
err_copy[p - tokstart] = 0;
|
||
error (_("Invalid number \"%s\"."), err_copy);
|
||
}
|
||
pstate->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 == '$' || (c >= '0' && c <= '9')
|
||
|| (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z'));
|
||
c = tokstart[++namelen])
|
||
;
|
||
|
||
/* The token "if" terminates the expression and is NOT
|
||
removed from the input stream. */
|
||
if (namelen == 2 && tokstart[0] == 'i' && tokstart[1] == 'f')
|
||
{
|
||
return 0;
|
||
}
|
||
|
||
pstate->lexptr += namelen;
|
||
|
||
/* Lookup special keywords */
|
||
for(i = 0 ; i < (int) (sizeof(keytab) / sizeof(keytab[0])) ; i++)
|
||
if (namelen == strlen (keytab[i].keyw)
|
||
&& strncmp (tokstart, keytab[i].keyw, namelen) == 0)
|
||
return keytab[i].token;
|
||
|
||
yylval.sval.ptr = tokstart;
|
||
yylval.sval.length = namelen;
|
||
|
||
if (*tokstart == '$')
|
||
{
|
||
write_dollar_variable (pstate, yylval.sval);
|
||
return DOLLAR_VARIABLE;
|
||
}
|
||
|
||
/* 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. */
|
||
{
|
||
std::string tmp = copy_name (yylval.sval);
|
||
struct symbol *sym;
|
||
|
||
if (lookup_symtab (tmp.c_str ()))
|
||
return BLOCKNAME;
|
||
sym = lookup_symbol (tmp.c_str (), pstate->expression_context_block,
|
||
VAR_DOMAIN, 0).symbol;
|
||
if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
|
||
return BLOCKNAME;
|
||
if (lookup_typename (pstate->language (),
|
||
tmp.c_str (), pstate->expression_context_block, 1))
|
||
return TYPENAME;
|
||
|
||
if(sym)
|
||
{
|
||
switch(SYMBOL_CLASS (sym))
|
||
{
|
||
case LOC_STATIC:
|
||
case LOC_REGISTER:
|
||
case LOC_ARG:
|
||
case LOC_REF_ARG:
|
||
case LOC_REGPARM_ADDR:
|
||
case LOC_LOCAL:
|
||
case LOC_CONST:
|
||
case LOC_CONST_BYTES:
|
||
case LOC_OPTIMIZED_OUT:
|
||
case LOC_COMPUTED:
|
||
return NAME;
|
||
|
||
case LOC_TYPEDEF:
|
||
return TYPENAME;
|
||
|
||
case LOC_BLOCK:
|
||
return BLOCKNAME;
|
||
|
||
case LOC_UNDEF:
|
||
error (_("internal: Undefined class in m2lex()"));
|
||
|
||
case LOC_LABEL:
|
||
case LOC_UNRESOLVED:
|
||
error (_("internal: Unforseen case in m2lex()"));
|
||
|
||
default:
|
||
error (_("unhandled token in m2lex()"));
|
||
break;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* Built-in BOOLEAN type. This is sort of a hack. */
|
||
if (strncmp (tokstart, "TRUE", 4) == 0)
|
||
{
|
||
yylval.ulval = 1;
|
||
return M2_TRUE;
|
||
}
|
||
else if (strncmp (tokstart, "FALSE", 5) == 0)
|
||
{
|
||
yylval.ulval = 0;
|
||
return M2_FALSE;
|
||
}
|
||
}
|
||
|
||
/* Must be another type of name... */
|
||
return NAME;
|
||
}
|
||
}
|
||
|
||
int
|
||
m2_parse (struct parser_state *par_state)
|
||
{
|
||
/* Setting up the parser state. */
|
||
scoped_restore pstate_restore = make_scoped_restore (&pstate);
|
||
gdb_assert (par_state != NULL);
|
||
pstate = par_state;
|
||
paren_depth = 0;
|
||
|
||
return yyparse ();
|
||
}
|
||
|
||
static void
|
||
yyerror (const char *msg)
|
||
{
|
||
if (pstate->prev_lexptr)
|
||
pstate->lexptr = pstate->prev_lexptr;
|
||
|
||
error (_("A %s in expression, near `%s'."), msg, pstate->lexptr);
|
||
}
|