407 lines
11 KiB
C
407 lines
11 KiB
C
/* Print in infix form a struct expression.
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Copyright (C) 1986, 1989, 1991 Free Software Foundation, Inc.
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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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#include "defs.h"
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#include "symtab.h"
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#include "gdbtypes.h"
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#include "expression.h"
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#include "value.h"
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#include "language.h"
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#include "parser-defs.h"
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/* Prototypes for local functions */
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static void
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print_subexp PARAMS ((struct expression *, int *, FILE *, enum precedence));
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static void
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print_simple_m2_func PARAMS ((char *, struct expression *, int *, FILE *));
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void
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print_expression (exp, stream)
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struct expression *exp;
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FILE *stream;
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{
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int pc = 0;
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print_subexp (exp, &pc, stream, PREC_NULL);
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}
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/* Print the subexpression of EXP that starts in position POS, on STREAM.
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PREC is the precedence of the surrounding operator;
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if the precedence of the main operator of this subexpression is less,
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parentheses are needed here. */
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static void
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print_subexp (exp, pos, stream, prec)
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register struct expression *exp;
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register int *pos;
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FILE *stream;
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enum precedence prec;
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{
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register unsigned tem;
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register const struct op_print *op_print_tab;
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register int pc;
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unsigned nargs;
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register char *op_str;
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int assign_modify = 0;
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enum exp_opcode opcode;
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enum precedence myprec;
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/* Set to 1 for a right-associative operator. */
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int assoc;
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value val;
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op_print_tab = exp->language_defn->la_op_print_tab;
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pc = (*pos)++;
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opcode = exp->elts[pc].opcode;
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switch (opcode)
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{
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/* Common ops */
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case OP_SCOPE:
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myprec = PREC_PREFIX;
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assoc = 0;
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(*pos) += 2;
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print_subexp (exp, pos, stream,
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(enum precedence) ((int) myprec + assoc));
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fputs_filtered (" :: ", stream);
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nargs = strlen (&exp->elts[pc + 2].string);
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(*pos) += 1 + (nargs + sizeof (union exp_element)) / sizeof (union exp_element);
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fputs_filtered (&exp->elts[pc + 2].string, stream);
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return;
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case OP_LONG:
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(*pos) += 3;
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value_print (value_from_longest (exp->elts[pc + 1].type,
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exp->elts[pc + 2].longconst),
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stream, 0, Val_no_prettyprint);
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return;
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case OP_DOUBLE:
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(*pos) += 3;
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value_print (value_from_double (exp->elts[pc + 1].type,
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exp->elts[pc + 2].doubleconst),
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stream, 0, Val_no_prettyprint);
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return;
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case OP_VAR_VALUE:
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(*pos) += 2;
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fputs_filtered (SYMBOL_NAME (exp->elts[pc + 1].symbol), stream);
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return;
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case OP_LAST:
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(*pos) += 2;
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fprintf_filtered (stream, "$%d",
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longest_to_int (exp->elts[pc + 1].longconst));
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return;
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case OP_REGISTER:
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(*pos) += 2;
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fprintf_filtered (stream, "$%s",
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reg_names[longest_to_int (exp->elts[pc + 1].longconst));
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return;
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case OP_INTERNALVAR:
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(*pos) += 2;
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fprintf_filtered (stream, "$%s",
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internalvar_name (exp->elts[pc + 1].internalvar));
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return;
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case OP_FUNCALL:
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(*pos) += 2;
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nargs = longest_to_int (exp->elts[pc + 1].longconst);
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print_subexp (exp, pos, stream, PREC_SUFFIX);
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fputs_filtered (" (", stream);
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for (tem = 0; tem < nargs; tem++)
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{
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if (tem != 0)
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fputs_filtered (", ", stream);
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print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
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}
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fputs_filtered (")", stream);
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return;
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case OP_STRING:
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nargs = strlen (&exp->elts[pc + 1].string);
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(*pos) += 2 + (nargs + sizeof (union exp_element)) / sizeof (union exp_element);
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fputs_filtered ("\"", stream);
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for (tem = 0; tem < nargs; tem++)
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printchar ((&exp->elts[pc + 1].string)[tem], stream, '"');
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fputs_filtered ("\"", stream);
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return;
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case TERNOP_COND:
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if ((int) prec > (int) PREC_COMMA)
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fputs_filtered ("(", stream);
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/* Print the subexpressions, forcing parentheses
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around any binary operations within them.
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This is more parentheses than are strictly necessary,
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but it looks clearer. */
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print_subexp (exp, pos, stream, PREC_HYPER);
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fputs_filtered (" ? ", stream);
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print_subexp (exp, pos, stream, PREC_HYPER);
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fputs_filtered (" : ", stream);
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print_subexp (exp, pos, stream, PREC_HYPER);
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if ((int) prec > (int) PREC_COMMA)
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fputs_filtered (")", stream);
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return;
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case STRUCTOP_STRUCT:
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tem = strlen (&exp->elts[pc + 1].string);
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(*pos) += 2 + (tem + sizeof (union exp_element)) / sizeof (union exp_element);
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print_subexp (exp, pos, stream, PREC_SUFFIX);
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fputs_filtered (".", stream);
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fputs_filtered (&exp->elts[pc + 1].string, stream);
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return;
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/* Will not occur for Modula-2 */
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case STRUCTOP_PTR:
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tem = strlen (&exp->elts[pc + 1].string);
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(*pos) += 2 + (tem + sizeof (union exp_element)) / sizeof (union exp_element);
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print_subexp (exp, pos, stream, PREC_SUFFIX);
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fputs_filtered ("->", stream);
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fputs_filtered (&exp->elts[pc + 1].string, stream);
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return;
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case BINOP_SUBSCRIPT:
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print_subexp (exp, pos, stream, PREC_SUFFIX);
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fputs_filtered ("[", stream);
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print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
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fputs_filtered ("]", stream);
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return;
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case UNOP_POSTINCREMENT:
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print_subexp (exp, pos, stream, PREC_SUFFIX);
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fputs_filtered ("++", stream);
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return;
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case UNOP_POSTDECREMENT:
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print_subexp (exp, pos, stream, PREC_SUFFIX);
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fputs_filtered ("--", stream);
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return;
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case UNOP_CAST:
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(*pos) += 2;
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if ((int) prec > (int) PREC_PREFIX)
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fputs_filtered ("(", stream);
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fputs_filtered ("(", stream);
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type_print (exp->elts[pc + 1].type, "", stream, 0);
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fputs_filtered (") ", stream);
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print_subexp (exp, pos, stream, PREC_PREFIX);
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if ((int) prec > (int) PREC_PREFIX)
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fputs_filtered (")", stream);
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return;
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case UNOP_MEMVAL:
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(*pos) += 2;
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if ((int) prec > (int) PREC_PREFIX)
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fputs_filtered ("(", stream);
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if (exp->elts[pc + 1].type->code == TYPE_CODE_FUNC &&
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exp->elts[pc + 3].opcode == OP_LONG) {
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/* We have a minimal symbol fn, probably. It's encoded
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as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
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Swallow the OP_LONG (including both its opcodes); ignore
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its type; print the value in the type of the MEMVAL. */
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(*pos) += 4;
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val = value_at_lazy (exp->elts[pc + 1].type,
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(CORE_ADDR) exp->elts[pc + 5].longconst);
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value_print (val, stream, 0, Val_no_prettyprint);
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} else {
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fputs_filtered ("{", stream);
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type_print (exp->elts[pc + 1].type, "", stream, 0);
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fputs_filtered ("} ", stream);
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print_subexp (exp, pos, stream, PREC_PREFIX);
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}
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if ((int) prec > (int) PREC_PREFIX)
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fputs_filtered (")", stream);
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return;
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case BINOP_ASSIGN_MODIFY:
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opcode = exp->elts[pc + 1].opcode;
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(*pos) += 2;
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myprec = PREC_ASSIGN;
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assoc = 1;
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assign_modify = 1;
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op_str = "???";
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for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
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if (op_print_tab[tem].opcode == opcode)
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{
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op_str = op_print_tab[tem].string;
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break;
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}
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break;
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/* C++ ops */
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case OP_THIS:
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++(*pos);
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fputs_filtered ("this", stream);
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return;
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/* Modula-2 ops */
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case BINOP_MULTI_SUBSCRIPT:
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(*pos) += 2;
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nargs = longest_to_int (exp->elts[pc + 1].longconst);
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print_subexp (exp, pos, stream, PREC_SUFFIX);
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fprintf (stream, " [");
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for (tem = 0; tem < nargs; tem++)
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{
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if (tem != 0)
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fprintf (stream, ", ");
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print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
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}
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fprintf (stream, "]");
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return;
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case BINOP_VAL:
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(*pos)+=2;
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fprintf(stream,"VAL(");
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type_print(exp->elts[pc+1].type,"",stream,0);
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fprintf(stream,",");
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print_subexp(exp,pos,stream,PREC_PREFIX);
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fprintf(stream,")");
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return;
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case UNOP_CAP:
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print_simple_m2_func("CAP",exp,pos,stream);
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return;
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case UNOP_CHR:
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print_simple_m2_func("CHR",exp,pos,stream);
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return;
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case UNOP_ORD:
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print_simple_m2_func("ORD",exp,pos,stream);
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return;
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case UNOP_ABS:
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print_simple_m2_func("ABS",exp,pos,stream);
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return;
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case UNOP_FLOAT:
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print_simple_m2_func("FLOAT",exp,pos,stream);
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return;
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case UNOP_HIGH:
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print_simple_m2_func("HIGH",exp,pos,stream);
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return;
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case UNOP_MAX:
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print_simple_m2_func("MAX",exp,pos,stream);
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return;
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case UNOP_MIN:
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print_simple_m2_func("MIN",exp,pos,stream);
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return;
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case UNOP_ODD:
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print_simple_m2_func("ODD",exp,pos,stream);
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return;
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case UNOP_TRUNC:
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print_simple_m2_func("TRUNC",exp,pos,stream);
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return;
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case BINOP_INCL:
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case BINOP_EXCL:
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error("print_subexp: Not implemented.");
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/* Default ops */
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default:
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op_str = "???";
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for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
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if (op_print_tab[tem].opcode == opcode)
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{
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op_str = op_print_tab[tem].string;
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myprec = op_print_tab[tem].precedence;
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assoc = op_print_tab[tem].right_assoc;
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break;
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}
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}
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if ((int) myprec < (int) prec)
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fputs_filtered ("(", stream);
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if ((int) opcode > (int) BINOP_END)
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{
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/* Unary prefix operator. */
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fputs_filtered (op_str, stream);
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print_subexp (exp, pos, stream, PREC_PREFIX);
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}
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else
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{
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/* Binary operator. */
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/* Print left operand.
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If operator is right-associative,
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increment precedence for this operand. */
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print_subexp (exp, pos, stream,
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(enum precedence) ((int) myprec + assoc));
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/* Print the operator itself. */
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if (assign_modify)
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fprintf_filtered (stream, " %s= ", op_str);
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else if (op_str[0] == ',')
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fprintf_filtered (stream, "%s ", op_str);
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else
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fprintf_filtered (stream, " %s ", op_str);
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/* Print right operand.
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If operator is left-associative,
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increment precedence for this operand. */
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print_subexp (exp, pos, stream,
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(enum precedence) ((int) myprec + !assoc));
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}
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if ((int) myprec < (int) prec)
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fputs_filtered (")", stream);
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}
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/* Print out something of the form <s>(<arg>).
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This is used to print out some builtin Modula-2
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functions.
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FIXME: There is probably some way to get the precedence
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rules to do this (print a unary operand with parens around it). */
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static void
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print_simple_m2_func(s,exp,pos,stream)
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char *s;
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register struct expression *exp;
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register int *pos;
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FILE *stream;
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{
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fprintf(stream,"%s(",s);
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print_subexp(exp,pos,stream,PREC_PREFIX);
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fprintf(stream,")");
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}
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/* Return the operator corresponding to opcode OP as
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a string. NULL indicates that the opcode was not found in the
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current language table. */
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char *
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op_string(op)
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enum exp_opcode op;
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{
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int tem;
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register const struct op_print *op_print_tab;
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op_print_tab = current_language->la_op_print_tab;
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for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
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if (op_print_tab[tem].opcode == op)
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return op_print_tab[tem].string;
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return NULL;
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}
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