* parse.c: New file with the common code remains of expread.y.
* expread.y, expread.tab.c: Remove. * parser-defs.h: New file with common declarations from expread.y. * c-exp.y: New file with the C parser from expread.y. * m2-exp.y: New file with the Modula-2 parser.
This commit is contained in:
John Gilmore
parent
997a978c5d
commit
3d6b6a9075
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/* Parse expressions for GDB.
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Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
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Modified from expread.y by the Department of Computer Science at the
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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 an 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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#include <stdio.h>
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#include "defs.h"
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#include "param.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 "value.h"
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#include "command.h"
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#include "language.h"
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#include "parser-defs.h"
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/* Assign machine-independent names to certain registers
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(unless overridden by the REGISTER_NAMES table) */
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struct std_regs std_regs[] = {
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#ifdef PC_REGNUM
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{ "pc", PC_REGNUM },
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#endif
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#ifdef FP_REGNUM
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{ "fp", FP_REGNUM },
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#endif
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#ifdef SP_REGNUM
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{ "sp", SP_REGNUM },
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#endif
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#ifdef PS_REGNUM
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{ "ps", PS_REGNUM },
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#endif
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};
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unsigned num_std_regs = (sizeof std_regs / sizeof std_regs[0]);
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/* Begin counting arguments for a function call,
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saving the data about any containing call. */
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void
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start_arglist ()
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{
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register struct funcall *new = (struct funcall *) xmalloc (sizeof (struct funcall));
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new->next = funcall_chain;
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new->arglist_len = arglist_len;
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arglist_len = 0;
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funcall_chain = new;
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}
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/* Return the number of arguments in a function call just terminated,
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and restore the data for the containing function call. */
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int
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end_arglist ()
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{
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register int val = arglist_len;
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register struct funcall *call = funcall_chain;
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funcall_chain = call->next;
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arglist_len = call->arglist_len;
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free (call);
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return val;
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}
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/* Free everything in the funcall chain.
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Used when there is an error inside parsing. */
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void
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free_funcalls ()
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{
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register struct funcall *call, *next;
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for (call = funcall_chain; call; call = next)
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{
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next = call->next;
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free (call);
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}
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}
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/* This page contains the functions for adding data to the struct expression
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being constructed. */
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/* Add one element to the end of the expression. */
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/* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
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a register through here */
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void
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write_exp_elt (expelt)
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union exp_element expelt;
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{
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if (expout_ptr >= expout_size)
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{
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expout_size *= 2;
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expout = (struct expression *) xrealloc (expout,
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sizeof (struct expression)
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+ expout_size * sizeof (union exp_element));
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}
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expout->elts[expout_ptr++] = expelt;
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}
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void
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write_exp_elt_opcode (expelt)
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enum exp_opcode expelt;
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{
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union exp_element tmp;
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tmp.opcode = expelt;
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write_exp_elt (tmp);
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}
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void
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write_exp_elt_sym (expelt)
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struct symbol *expelt;
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{
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union exp_element tmp;
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tmp.symbol = expelt;
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write_exp_elt (tmp);
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}
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void
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write_exp_elt_longcst (expelt)
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LONGEST expelt;
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{
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union exp_element tmp;
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tmp.longconst = expelt;
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write_exp_elt (tmp);
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}
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void
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write_exp_elt_dblcst (expelt)
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double expelt;
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{
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union exp_element tmp;
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tmp.doubleconst = expelt;
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write_exp_elt (tmp);
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}
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void
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write_exp_elt_type (expelt)
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struct type *expelt;
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{
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union exp_element tmp;
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tmp.type = expelt;
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write_exp_elt (tmp);
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}
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void
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write_exp_elt_intern (expelt)
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struct internalvar *expelt;
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{
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union exp_element tmp;
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tmp.internalvar = expelt;
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write_exp_elt (tmp);
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}
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/* Add a string constant to the end of the expression.
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Follow it by its length in bytes, as a separate exp_element. */
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void
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write_exp_string (str)
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struct stoken str;
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{
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register int len = str.length;
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register int lenelt
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= (len + sizeof (union exp_element)) / sizeof (union exp_element);
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expout_ptr += lenelt;
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if (expout_ptr >= expout_size)
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{
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expout_size = max (expout_size * 2, expout_ptr + 10);
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expout = (struct expression *)
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xrealloc (expout, (sizeof (struct expression)
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+ (expout_size * sizeof (union exp_element))));
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}
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bcopy (str.ptr, (char *) &expout->elts[expout_ptr - lenelt], len);
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((char *) &expout->elts[expout_ptr - lenelt])[len] = 0;
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write_exp_elt_longcst ((LONGEST) len);
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}
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/* Return a null-terminated temporary copy of the name
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of a string token. */
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char *
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copy_name (token)
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struct stoken token;
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{
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bcopy (token.ptr, namecopy, token.length);
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namecopy[token.length] = 0;
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return namecopy;
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}
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/* Reverse an expression from suffix form (in which it is constructed)
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to prefix form (in which we can conveniently print or execute it). */
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static void prefixify_subexp ();
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void
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prefixify_expression (expr)
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register struct expression *expr;
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{
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register int len = sizeof (struct expression) +
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expr->nelts * sizeof (union exp_element);
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register struct expression *temp;
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register int inpos = expr->nelts, outpos = 0;
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temp = (struct expression *) alloca (len);
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/* Copy the original expression into temp. */
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bcopy (expr, temp, len);
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prefixify_subexp (temp, expr, inpos, outpos);
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}
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/* Return the number of exp_elements in the subexpression of EXPR
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whose last exp_element is at index ENDPOS - 1 in EXPR. */
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int
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length_of_subexp (expr, endpos)
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register struct expression *expr;
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register int endpos;
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{
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register int oplen = 1;
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register int args = 0;
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register int i;
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if (endpos < 0)
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error ("?error in length_of_subexp");
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i = (int) expr->elts[endpos - 1].opcode;
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switch (i)
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{
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/* C++ */
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case OP_SCOPE:
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oplen = 4 + ((expr->elts[endpos - 2].longconst
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+ sizeof (union exp_element))
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/ sizeof (union exp_element));
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break;
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case OP_LONG:
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case OP_DOUBLE:
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oplen = 4;
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break;
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case OP_TYPE:
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case OP_BOOL:
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case OP_VAR_VALUE:
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case OP_LAST:
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case OP_REGISTER:
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case OP_INTERNALVAR:
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oplen = 3;
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break;
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case OP_FUNCALL:
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oplen = 3;
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args = 1 + expr->elts[endpos - 2].longconst;
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break;
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case UNOP_MAX:
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case UNOP_MIN:
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oplen = 3;
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args = 0;
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break;
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case BINOP_VAL:
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case UNOP_CAST:
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case UNOP_MEMVAL:
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oplen = 3;
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args = 1;
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break;
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case UNOP_ABS:
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case UNOP_CAP:
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case UNOP_CHR:
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case UNOP_FLOAT:
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case UNOP_HIGH:
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case UNOP_ODD:
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case UNOP_ORD:
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case UNOP_TRUNC:
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oplen = 1;
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args = 1;
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break;
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case STRUCTOP_STRUCT:
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case STRUCTOP_PTR:
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args = 1;
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case OP_M2_STRING:
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case OP_STRING:
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oplen = 3 + ((expr->elts[endpos - 2].longconst
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+ sizeof (union exp_element))
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/ sizeof (union exp_element));
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break;
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case TERNOP_COND:
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args = 3;
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break;
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/* Modula-2 */
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case BINOP_MULTI_SUBSCRIPT:
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oplen=3;
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args = 1 + expr->elts[endpos- 2].longconst;
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break;
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case BINOP_ASSIGN_MODIFY:
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oplen = 3;
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args = 2;
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break;
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/* C++ */
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case OP_THIS:
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oplen = 2;
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break;
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default:
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args = 1 + (i < (int) BINOP_END);
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}
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while (args > 0)
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{
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oplen += length_of_subexp (expr, endpos - oplen);
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args--;
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}
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return oplen;
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}
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/* Copy the subexpression ending just before index INEND in INEXPR
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into OUTEXPR, starting at index OUTBEG.
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In the process, convert it from suffix to prefix form. */
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static void
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prefixify_subexp (inexpr, outexpr, inend, outbeg)
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register struct expression *inexpr;
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struct expression *outexpr;
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register int inend;
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int outbeg;
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{
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register int oplen = 1;
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register int args = 0;
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register int i;
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int *arglens;
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enum exp_opcode opcode;
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/* Compute how long the last operation is (in OPLEN),
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and also how many preceding subexpressions serve as
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arguments for it (in ARGS). */
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opcode = inexpr->elts[inend - 1].opcode;
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switch (opcode)
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{
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/* C++ */
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case OP_SCOPE:
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oplen = 4 + ((inexpr->elts[inend - 2].longconst
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+ sizeof (union exp_element))
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/ sizeof (union exp_element));
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break;
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case OP_LONG:
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case OP_DOUBLE:
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oplen = 4;
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break;
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case OP_TYPE:
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case OP_BOOL:
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case OP_VAR_VALUE:
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case OP_LAST:
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case OP_REGISTER:
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case OP_INTERNALVAR:
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oplen = 3;
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break;
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case OP_FUNCALL:
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oplen = 3;
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args = 1 + inexpr->elts[inend - 2].longconst;
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break;
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case UNOP_MIN:
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case UNOP_MAX:
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oplen = 3;
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args = 0;
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break;
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case UNOP_CAST:
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case UNOP_MEMVAL:
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oplen = 3;
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args = 1;
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break;
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case UNOP_ABS:
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case UNOP_CAP:
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case UNOP_CHR:
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case UNOP_FLOAT:
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case UNOP_HIGH:
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case UNOP_ODD:
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case UNOP_ORD:
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case UNOP_TRUNC:
|
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oplen=1;
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args=1;
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break;
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case STRUCTOP_STRUCT:
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case STRUCTOP_PTR:
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args = 1;
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case OP_M2_STRING:
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case OP_STRING:
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oplen = 3 + ((inexpr->elts[inend - 2].longconst
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+ sizeof (union exp_element))
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/ sizeof (union exp_element));
|
||||
|
||||
break;
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||||
|
||||
case TERNOP_COND:
|
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args = 3;
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||||
break;
|
||||
|
||||
case BINOP_ASSIGN_MODIFY:
|
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oplen = 3;
|
||||
args = 2;
|
||||
break;
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||||
|
||||
/* Modula-2 */
|
||||
case BINOP_MULTI_SUBSCRIPT:
|
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oplen=3;
|
||||
args = 1 + inexpr->elts[inend - 2].longconst;
|
||||
break;
|
||||
|
||||
/* C++ */
|
||||
case OP_THIS:
|
||||
oplen = 2;
|
||||
break;
|
||||
|
||||
default:
|
||||
args = 1 + ((int) opcode < (int) BINOP_END);
|
||||
}
|
||||
|
||||
/* Copy the final operator itself, from the end of the input
|
||||
to the beginning of the output. */
|
||||
inend -= oplen;
|
||||
bcopy (&inexpr->elts[inend], &outexpr->elts[outbeg],
|
||||
oplen * sizeof (union exp_element));
|
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outbeg += oplen;
|
||||
|
||||
/* Find the lengths of the arg subexpressions. */
|
||||
arglens = (int *) alloca (args * sizeof (int));
|
||||
for (i = args - 1; i >= 0; i--)
|
||||
{
|
||||
oplen = length_of_subexp (inexpr, inend);
|
||||
arglens[i] = oplen;
|
||||
inend -= oplen;
|
||||
}
|
||||
|
||||
/* Now copy each subexpression, preserving the order of
|
||||
the subexpressions, but prefixifying each one.
|
||||
In this loop, inend starts at the beginning of
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||||
the expression this level is working on
|
||||
and marches forward over the arguments.
|
||||
outbeg does similarly in the output. */
|
||||
for (i = 0; i < args; i++)
|
||||
{
|
||||
oplen = arglens[i];
|
||||
inend += oplen;
|
||||
prefixify_subexp (inexpr, outexpr, inend, outbeg);
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||||
outbeg += oplen;
|
||||
}
|
||||
}
|
||||
|
||||
/* This page contains the two entry points to this file. */
|
||||
|
||||
/* Read an expression from the string *STRINGPTR points to,
|
||||
parse it, and return a pointer to a struct expression that we malloc.
|
||||
Use block BLOCK as the lexical context for variable names;
|
||||
if BLOCK is zero, use the block of the selected stack frame.
|
||||
Meanwhile, advance *STRINGPTR to point after the expression,
|
||||
at the first nonwhite character that is not part of the expression
|
||||
(possibly a null character).
|
||||
|
||||
If COMMA is nonzero, stop if a comma is reached. */
|
||||
|
||||
struct expression *
|
||||
parse_exp_1 (stringptr, block, comma)
|
||||
char **stringptr;
|
||||
struct block *block;
|
||||
int comma;
|
||||
{
|
||||
struct cleanup *old_chain;
|
||||
|
||||
lexptr = *stringptr;
|
||||
|
||||
paren_depth = 0;
|
||||
type_stack_depth = 0;
|
||||
|
||||
comma_terminates = comma;
|
||||
|
||||
if (lexptr == 0 || *lexptr == 0)
|
||||
error_no_arg ("expression to compute");
|
||||
|
||||
old_chain = make_cleanup (free_funcalls, 0);
|
||||
funcall_chain = 0;
|
||||
|
||||
expression_context_block = block ? block : get_selected_block ();
|
||||
|
||||
namecopy = (char *) alloca (strlen (lexptr) + 1);
|
||||
expout_size = 10;
|
||||
expout_ptr = 0;
|
||||
expout = (struct expression *)
|
||||
xmalloc (sizeof (struct expression)
|
||||
+ expout_size * sizeof (union exp_element));
|
||||
expout->language_defn = current_language;
|
||||
make_cleanup (free_current_contents, &expout);
|
||||
|
||||
if (current_language->la_parser ())
|
||||
current_language->la_error (NULL);
|
||||
|
||||
discard_cleanups (old_chain);
|
||||
expout->nelts = expout_ptr;
|
||||
expout = (struct expression *)
|
||||
xrealloc (expout,
|
||||
sizeof (struct expression)
|
||||
+ expout_ptr * sizeof (union exp_element));
|
||||
prefixify_expression (expout);
|
||||
*stringptr = lexptr;
|
||||
return expout;
|
||||
}
|
||||
|
||||
/* Parse STRING as an expression, and complain if this fails
|
||||
to use up all of the contents of STRING. */
|
||||
|
||||
struct expression *
|
||||
parse_expression (string)
|
||||
char *string;
|
||||
{
|
||||
register struct expression *exp;
|
||||
exp = parse_exp_1 (&string, 0, 0);
|
||||
if (*string)
|
||||
error ("Junk after end of expression.");
|
||||
return exp;
|
||||
}
|
||||
|
||||
void
|
||||
push_type (tp)
|
||||
enum type_pieces tp;
|
||||
{
|
||||
if (type_stack_depth == type_stack_size)
|
||||
{
|
||||
type_stack_size *= 2;
|
||||
type_stack = (union type_stack_elt *)
|
||||
xrealloc (type_stack, type_stack_size * sizeof (*type_stack));
|
||||
}
|
||||
type_stack[type_stack_depth++].piece = tp;
|
||||
}
|
||||
|
||||
void
|
||||
push_type_int (n)
|
||||
int n;
|
||||
{
|
||||
if (type_stack_depth == type_stack_size)
|
||||
{
|
||||
type_stack_size *= 2;
|
||||
type_stack = (union type_stack_elt *)
|
||||
xrealloc (type_stack, type_stack_size * sizeof (*type_stack));
|
||||
}
|
||||
type_stack[type_stack_depth++].int_val = n;
|
||||
}
|
||||
|
||||
enum type_pieces
|
||||
pop_type ()
|
||||
{
|
||||
if (type_stack_depth)
|
||||
return type_stack[--type_stack_depth].piece;
|
||||
return tp_end;
|
||||
}
|
||||
|
||||
int
|
||||
pop_type_int ()
|
||||
{
|
||||
if (type_stack_depth)
|
||||
return type_stack[--type_stack_depth].int_val;
|
||||
/* "Can't happen". */
|
||||
return 0;
|
||||
}
|
||||
|
||||
void
|
||||
_initialize_parse ()
|
||||
{
|
||||
type_stack_size = 80;
|
||||
type_stack_depth = 0;
|
||||
type_stack = (union type_stack_elt *)
|
||||
xmalloc (type_stack_size * sizeof (*type_stack));
|
||||
}
|
||||
|
|
@ -0,0 +1,162 @@
|
|||
/* Parser definitions for GDB.
|
||||
Copyright (C) 1986, 1989, 1990, 1991 Free Software Foundation, Inc.
|
||||
Modified from expread.y by the Department of Computer Science at the
|
||||
State University of New York at Buffalo.
|
||||
|
||||
This file is part of GDB.
|
||||
|
||||
This program is free software; you can redistribute it and/or modify
|
||||
it under the terms of the GNU General Public License as published by
|
||||
the Free Software Foundation; either version 2 of the License, or
|
||||
(at your option) any later version.
|
||||
|
||||
This program is distributed in the hope that it will be useful,
|
||||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
GNU General Public License for more details.
|
||||
|
||||
You should have received a copy of the GNU General Public License
|
||||
along with this program; if not, write to the Free Software
|
||||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||||
|
||||
struct std_regs {
|
||||
char *name;
|
||||
int regnum;
|
||||
};
|
||||
|
||||
extern struct std_regs std_regs[];
|
||||
extern unsigned num_std_regs;
|
||||
|
||||
struct expression *expout;
|
||||
int expout_size;
|
||||
int expout_ptr;
|
||||
|
||||
extern struct type *init_type ();
|
||||
|
||||
void write_exp_elt ();
|
||||
void write_exp_elt_opcode ();
|
||||
void write_exp_elt_sym ();
|
||||
void write_exp_elt_longcst ();
|
||||
void write_exp_elt_dblcst ();
|
||||
void write_exp_elt_type ();
|
||||
void write_exp_elt_intern ();
|
||||
void write_exp_string ();
|
||||
void start_arglist ();
|
||||
int end_arglist ();
|
||||
void free_funcalls ();
|
||||
char *copy_name ();
|
||||
|
||||
/* If this is nonzero, this block is used as the lexical context
|
||||
for symbol names. */
|
||||
|
||||
struct block *expression_context_block;
|
||||
|
||||
/* The innermost context required by the stack and register variables
|
||||
we've encountered so far. */
|
||||
struct block *innermost_block;
|
||||
|
||||
/* The block in which the most recently discovered symbol was found. */
|
||||
struct block *block_found;
|
||||
|
||||
/* Number of arguments seen so far in innermost function call. */
|
||||
int arglist_len;
|
||||
|
||||
/* Data structure for saving values of arglist_len
|
||||
for function calls whose arguments contain other function calls. */
|
||||
|
||||
struct funcall
|
||||
{
|
||||
struct funcall *next;
|
||||
int arglist_len;
|
||||
};
|
||||
|
||||
struct funcall *funcall_chain;
|
||||
|
||||
/* This kind of datum is used to represent the name
|
||||
of a symbol token. */
|
||||
|
||||
struct stoken
|
||||
{
|
||||
char *ptr;
|
||||
int length;
|
||||
};
|
||||
|
||||
struct ttype
|
||||
{
|
||||
struct stoken stoken;
|
||||
struct type *type;
|
||||
};
|
||||
|
||||
struct symtoken
|
||||
{
|
||||
struct stoken stoken;
|
||||
struct symbol *sym;
|
||||
int is_a_field_of_this;
|
||||
};
|
||||
|
||||
/* For parsing of complicated types.
|
||||
An array should be preceded in the list by the size of the array. */
|
||||
enum type_pieces
|
||||
{tp_end = -1, tp_pointer, tp_reference, tp_array, tp_function};
|
||||
/* The stack can contain either an enum type_pieces or an int. */
|
||||
union type_stack_elt {
|
||||
enum type_pieces piece;
|
||||
int int_val;
|
||||
};
|
||||
union type_stack_elt *type_stack;
|
||||
int type_stack_depth, type_stack_size;
|
||||
|
||||
void push_type ();
|
||||
void push_type_int ();
|
||||
enum type_pieces pop_type ();
|
||||
int pop_type_int ();
|
||||
|
||||
/* During parsing of a C expression, the pointer to the next character
|
||||
is in this variable. */
|
||||
|
||||
char *lexptr;
|
||||
|
||||
/* Tokens that refer to names do so with explicit pointer and length,
|
||||
so they can share the storage that lexptr is parsing.
|
||||
|
||||
When it is necessary to pass a name to a function that expects
|
||||
a null-terminated string, the substring is copied out
|
||||
into a block of storage that namecopy points to.
|
||||
|
||||
namecopy is allocated once, guaranteed big enough, for each parsing. */
|
||||
|
||||
char *namecopy;
|
||||
|
||||
/* Current depth in parentheses within the expression. */
|
||||
|
||||
int paren_depth;
|
||||
|
||||
/* Nonzero means stop parsing on first comma (if not within parentheses). */
|
||||
|
||||
int comma_terminates;
|
||||
|
||||
/* These codes indicate operator precedences for expression printing,
|
||||
least tightly binding first. */
|
||||
/* Adding 1 to a precedence value is done for binary operators,
|
||||
on the operand which is more tightly bound, so that operators
|
||||
of equal precedence within that operand will get parentheses. */
|
||||
/* PREC_HYPER and PREC_ABOVE_COMMA are not the precedence of any operator;
|
||||
they are used as the "surrounding precedence" to force
|
||||
various kinds of things to be parenthesized. */
|
||||
enum precedence
|
||||
{ PREC_NULL, PREC_COMMA, PREC_ABOVE_COMMA, PREC_ASSIGN, PREC_OR, PREC_AND,
|
||||
PREC_LOGIOR, PREC_LOGAND, PREC_LOGXOR, PREC_EQUAL, PREC_ORDER,
|
||||
PREC_SHIFT, PREC_ADD, PREC_MUL, PREC_REPEAT,
|
||||
PREC_HYPER, PREC_PREFIX, PREC_SUFFIX };
|
||||
|
||||
/* Table mapping opcodes into strings for printing operators
|
||||
and precedences of the operators. */
|
||||
|
||||
struct op_print
|
||||
{
|
||||
char *string;
|
||||
enum exp_opcode opcode;
|
||||
/* Precedence of operator. These values are used only by comparisons. */
|
||||
enum precedence precedence;
|
||||
int right_assoc;
|
||||
};
|
||||
Loading…
Reference in New Issue