stage3/lvalue_check.cc
author Manuele Conti <conti.ma@alice.it>
Thu, 16 Aug 2012 22:44:38 +0200
changeset 641 5681f600ac18
parent 615 509b79602f7c
child 661 f537c3315f83
permissions -rw-r--r--
Fix Segmentation Fault FB var declaration in a single list.
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     1
/*
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     2
 *  matiec - a compiler for the programming languages defined in IEC 61131-3
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     3
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     4
 *  Copyright (C) 2009-2012  Mario de Sousa (msousa@fe.up.pt)
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     5
 *  Copyright (C) 2012       Manuele Conti  (conti.ma@alice.it)
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     6
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     7
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     8
 *  This program is free software: you can redistribute it and/or modify
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
     9
 *  it under the terms of the GNU General Public License as published by
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    10
 *  the Free Software Foundation, either version 3 of the License, or
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    11
 *  (at your option) any later version.
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    12
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    13
 *  This program is distributed in the hope that it will be useful,
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    14
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    15
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    16
 *  GNU General Public License for more details.
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    17
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    18
 *  You should have received a copy of the GNU General Public License
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    19
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    20
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    21
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    22
 * This code is made available on the understanding that it will not be
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    23
 * used in safety-critical situations without a full and competent review.
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    24
 */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    25
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    26
/*
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    27
 * An IEC 61131-3 compiler.
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    28
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    29
 * Based on the
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    30
 * FINAL DRAFT - IEC 61131-3, 2nd Ed. (2001-12-10)
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    31
 *
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    32
 */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    33
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    34
553
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    35
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    36
/* Expressions on the left hand side of assignment statements have aditional restrictions on their datatype.
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    37
 * For example, they cannot be literals, CONSTANT type variables, function invocations, etc...
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    38
 * This class wil do those checks.
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    39
 * 
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    40
 * Note that assignment may also be done when passing variables to OUTPUT or IN_OUT function parameters,so we check those too.
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    41
 */
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    42
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    43
b654ca7a031a Add some comments...
mjsousa <msousa@fe.up.pt>
parents: 535
diff changeset
    44
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    45
#include "lvalue_check.hh"
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    46
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    47
#define FIRST_(symbol1, symbol2) (((symbol1)->first_order < (symbol2)->first_order)   ? (symbol1) : (symbol2))
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    48
#define  LAST_(symbol1, symbol2) (((symbol1)->last_order  > (symbol2)->last_order)    ? (symbol1) : (symbol2))
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    49
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    50
#define STAGE3_ERROR(error_level, symbol1, symbol2, ...) {                                                                  \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    51
  if (current_display_error_level >= error_level) {                                                                         \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    52
    fprintf(stderr, "%s:%d-%d..%d-%d: error: ",                                                                             \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    53
            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    54
                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    55
    fprintf(stderr, __VA_ARGS__);                                                                                           \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    56
    fprintf(stderr, "\n");                                                                                                  \
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
    57
    error_count++;                                                                                                     \
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    58
  }                                                                                                                         \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    59
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    60
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    61
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    62
#define STAGE3_WARNING(symbol1, symbol2, ...) {                                                                             \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    63
    fprintf(stderr, "%s:%d-%d..%d-%d: warning: ",                                                                           \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    64
            FIRST_(symbol1,symbol2)->first_file, FIRST_(symbol1,symbol2)->first_line, FIRST_(symbol1,symbol2)->first_column,\
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    65
                                                 LAST_(symbol1,symbol2) ->last_line,  LAST_(symbol1,symbol2) ->last_column);\
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    66
    fprintf(stderr, __VA_ARGS__);                                                                                           \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    67
    fprintf(stderr, "\n");                                                                                                  \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    68
    warning_found = true;                                                                                                   \
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    69
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    70
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    71
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    72
lvalue_check_c::lvalue_check_c(symbol_c *ignore) {
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
    73
	error_count = 0;
555
da6e089d0006 Fix bug: initialise un-initialised variable.
mjsousa <msousa@fe.up.pt>
parents: 554
diff changeset
    74
	current_display_error_level = 0;
528
6510ee2eaab9 Remove erroneous check for S1 and R1, and add missing declrataion.
Mario de Sousa <msousa@fe.up.pt>
parents: 527
diff changeset
    75
	current_il_operand = NULL;
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    76
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    77
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    78
lvalue_check_c::~lvalue_check_c(void) {
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    79
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    80
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
    81
int lvalue_check_c::get_error_count() {
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
    82
	return error_count;
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    83
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    84
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
    85
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
    86
#include <strings.h>
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    87
/* No writing to iterator variables (used in FOR loops) inside the loop itself */
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
    88
void lvalue_check_c::check_assignment_to_controlvar(symbol_c *lvalue) {
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    89
	for (unsigned int i = 0; i < control_variables.size(); i++) {
512
f915ab676d7e Fixing check for assingment to FOR control variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 510
diff changeset
    90
		token_c *lvalue_name = get_var_name_c::get_name(lvalue);
f915ab676d7e Fixing check for assingment to FOR control variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 510
diff changeset
    91
		if (compare_identifiers(lvalue_name, control_variables[i]) == 0) {
f915ab676d7e Fixing check for assingment to FOR control variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 510
diff changeset
    92
			STAGE3_ERROR(0, lvalue, lvalue, "Assignment to FOR control variable is not allowed.");
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    93
			break;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    94
		}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    95
	}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    96
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
    97
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
    98
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
    99
/* fb_instance.var := ...  is not valid if var is output variable */
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   100
/* NOTE, if a fb_instance1.fb_instance2.fb_instance3.var is used, we must iteratively check that none of the 
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   101
 *       FB records are declared as OUTPUT variables!!  
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   102
 *       This is the reason why we have the while() loop in this function!
615
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   103
 * 
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   104
 *       Note, however, that the first record (fb_instance1 in the above example) may be an output variable!
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   105
 */
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   106
void lvalue_check_c::check_assignment_to_output(symbol_c *lvalue) {
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   107
	decompose_var_instance_name_c decompose_lvalue(lvalue);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   108
	search_base_type_c            search_base_type;
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   109
519
018093957030 Add comment.
Mario de Sousa <msousa@fe.up.pt>
parents: 518
diff changeset
   110
	/* Get the first element/record of the potentially structured variable symbol */
018093957030 Add comment.
Mario de Sousa <msousa@fe.up.pt>
parents: 518
diff changeset
   111
	/* Note that if symbol is pointing to an expression (or simply a literal value), it will return a NULL.
018093957030 Add comment.
Mario de Sousa <msousa@fe.up.pt>
parents: 518
diff changeset
   112
	 * Once we have implemented the check_assignment_to_expression() method, and abort calling the other checks (including this one)
018093957030 Add comment.
Mario de Sousa <msousa@fe.up.pt>
parents: 518
diff changeset
   113
	 * when an expression is found, we may replace this check with an assertion...
018093957030 Add comment.
Mario de Sousa <msousa@fe.up.pt>
parents: 518
diff changeset
   114
	 * if (NULL == struct_elem) ERROR;
018093957030 Add comment.
Mario de Sousa <msousa@fe.up.pt>
parents: 518
diff changeset
   115
	 */
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   116
	symbol_c *struct_elem = decompose_lvalue.next_part();
518
a0a32a0c61ef Fix Segmentation fault in check_assignment_to_output lvalue method.
Conti Manuele <conti.ma@alice.it>
parents: 513
diff changeset
   117
	if (NULL == struct_elem) return;
519
018093957030 Add comment.
Mario de Sousa <msousa@fe.up.pt>
parents: 518
diff changeset
   118
	
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   119
	symbol_c *type_decl   = search_var_instance_decl->get_decl(struct_elem);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   120
	// symbol_c *type_id  = spec_init_sperator_c::get_spec(type_decl); /* this is not required! search_base_type_c can handle spec_init symbols! */
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   121
	symbol_c *basetype_id = search_base_type.get_basetype_id(/*type_id*/ type_decl);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   122
	/* If we can not determine the data type of the element, then the code must have a data type semantic error.
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   123
	 * This will have been caught by the data type semantic verifier, so we do not bother with this anymore!
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   124
	 */
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   125
	if (NULL == basetype_id) return;
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   126
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   127
	/* Determine if the record/structure element is of a FB type. */
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   128
	/* NOTE: If the structure element is not a FB type, then we can quit this check.
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   129
	 *       Remember that the standard does not allow a STRUCT data type to have elements that are FB instances!
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   130
	 *       Similarly, arrays of FB instances is also not allowed.
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   131
	 *       So, as soon as we find one record/structure element that is not a FB, no other record/structure element
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   132
	 *       will be of FB type, which means we can quit this check!
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   133
	 */
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   134
	function_block_declaration_c *fb_decl = function_block_type_symtable.find_value(basetype_id);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   135
	if (function_block_type_symtable.end_value() == fb_decl) return;
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   136
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   137
	while (NULL != (struct_elem = decompose_lvalue.next_part())) {
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   138
		search_var_instance_decl_c   fb_search_var_instance_decl(fb_decl);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   139
		if (search_var_instance_decl_c::output_vt == fb_search_var_instance_decl.get_vartype(struct_elem)) {
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   140
			STAGE3_ERROR(0, struct_elem, struct_elem, "Assignment to FB output variable is not allowed.");
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   141
			return; /* no need to carry on checking once the first error is found! */
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   142
		}
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   143
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   144
		/* prepare for any possible further record/structure elements */
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   145
		type_decl   = fb_search_var_instance_decl.get_decl(struct_elem);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   146
		basetype_id = search_base_type.get_basetype_id(type_decl);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   147
		if (NULL == basetype_id) return; /* same comment as above... */
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   148
		fb_decl = function_block_type_symtable.find_value(basetype_id);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   149
		if (function_block_type_symtable.end_value() == fb_decl) return; /* same comment as above... */
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   150
	}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   151
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   152
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   153
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   154
/*  No writing to CONSTANTs */
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   155
void lvalue_check_c::check_assignment_to_constant(symbol_c *lvalue) {
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   156
	unsigned int option = search_var_instance_decl->get_option(lvalue);
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   157
	if (option == search_var_instance_decl_c::constant_opt) {
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   158
		STAGE3_ERROR(0, lvalue, lvalue, "Assignment to CONSTANT variables is not be allowed.");
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   159
	}
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   160
}
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   161
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   162
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   163
/*  No assigning values to expressions. */
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   164
void lvalue_check_c::check_assignment_to_expression(symbol_c *lvalue) {
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   165
	/* This may occur in function invocations, when passing values (possibly an expression) to one 
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   166
	 * of the function's OUTPUT or IN_OUT parameters.
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   167
	 */
524
52b18b3c7490 Implement check_assignment_to_expression in lvalue_check_c class.
Conti Manuele <conti.ma@alice.it>
parents: 519
diff changeset
   168
	/* This may occur in function invocations, when passing values (possibly an expression) to one
52b18b3c7490 Implement check_assignment_to_expression in lvalue_check_c class.
Conti Manuele <conti.ma@alice.it>
parents: 519
diff changeset
   169
	 * of the function's OUTPUT or IN_OUT parameters.
52b18b3c7490 Implement check_assignment_to_expression in lvalue_check_c class.
Conti Manuele <conti.ma@alice.it>
parents: 519
diff changeset
   170
	 */
525
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   171
	if ( 
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   172
	     /*********************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   173
	     /* B 1.2 - Constants */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   174
	     /*********************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   175
	     /******************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   176
	     /* B 1.2.1 - Numeric Literals */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   177
	     /******************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   178
	     (typeid( *lvalue ) == typeid( real_c                         )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   179
	     (typeid( *lvalue ) == typeid( integer_c                      )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   180
	     (typeid( *lvalue ) == typeid( binary_integer_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   181
	     (typeid( *lvalue ) == typeid( octal_integer_c                )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   182
	     (typeid( *lvalue ) == typeid( hex_integer_c                  )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   183
	     (typeid( *lvalue ) == typeid( neg_real_c                     )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   184
	     (typeid( *lvalue ) == typeid( neg_integer_c                  )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   185
	     (typeid( *lvalue ) == typeid( integer_literal_c              )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   186
	     (typeid( *lvalue ) == typeid( real_literal_c                 )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   187
	     (typeid( *lvalue ) == typeid( bit_string_literal_c           )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   188
	     (typeid( *lvalue ) == typeid( boolean_literal_c              )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   189
	     (typeid( *lvalue ) == typeid( boolean_true_c                 )) || /* should not really be needed */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   190
	     (typeid( *lvalue ) == typeid( boolean_false_c                )) || /* should not really be needed */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   191
	     /*******************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   192
	     /* B.1.2.2   Character Strings */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   193
	     /*******************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   194
	     (typeid( *lvalue ) == typeid( double_byte_character_string_c )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   195
	     (typeid( *lvalue ) == typeid( single_byte_character_string_c )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   196
	     /***************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   197
	     /* B 1.2.3 - Time Literals */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   198
	     /***************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   199
	     /************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   200
	     /* B 1.2.3.1 - Duration */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   201
	     /************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   202
	     (typeid( *lvalue ) == typeid( duration_c                     )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   203
	     /************************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   204
	     /* B 1.2.3.2 - Time of day and Date */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   205
	     /************************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   206
	     (typeid( *lvalue ) == typeid( time_of_day_c                  )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   207
	     (typeid( *lvalue ) == typeid( daytime_c                      )) || /* should not really be needed */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   208
	     (typeid( *lvalue ) == typeid( date_c                         )) || /* should not really be needed */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   209
	     (typeid( *lvalue ) == typeid( date_literal_c                 )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   210
	     (typeid( *lvalue ) == typeid( date_and_time_c                )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   211
	     /***************************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   212
	     /* B.3 - Language ST (Structured Text) */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   213
	     /***************************************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   214
	     /***********************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   215
	     /* B 3.1 - Expressions */
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   216
	     /***********************/
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   217
	     (typeid( *lvalue ) == typeid( or_expression_c                )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   218
	     (typeid( *lvalue ) == typeid( xor_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   219
	     (typeid( *lvalue ) == typeid( and_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   220
	     (typeid( *lvalue ) == typeid( equ_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   221
	     (typeid( *lvalue ) == typeid( notequ_expression_c            )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   222
	     (typeid( *lvalue ) == typeid( lt_expression_c                )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   223
	     (typeid( *lvalue ) == typeid( gt_expression_c                )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   224
	     (typeid( *lvalue ) == typeid( le_expression_c                )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   225
	     (typeid( *lvalue ) == typeid( ge_expression_c                )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   226
	     (typeid( *lvalue ) == typeid( add_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   227
	     (typeid( *lvalue ) == typeid( sub_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   228
	     (typeid( *lvalue ) == typeid( mul_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   229
	     (typeid( *lvalue ) == typeid( div_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   230
	     (typeid( *lvalue ) == typeid( mod_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   231
	     (typeid( *lvalue ) == typeid( power_expression_c             )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   232
	     (typeid( *lvalue ) == typeid( neg_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   233
	     (typeid( *lvalue ) == typeid( not_expression_c               )) ||
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   234
	     (typeid( *lvalue ) == typeid( function_invocation_c          )))
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   235
		STAGE3_ERROR(0, lvalue, lvalue, "Assigning an expression to an OUT or IN_OUT parameter is not allowed.");
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   236
}                                                                  
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   237
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   238
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   239
77bff42a025e Literals are also part of expressions!
Mario de Sousa <msousa@fe.up.pt>
parents: 524
diff changeset
   240
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   241
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   242
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   243
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   244
void lvalue_check_c::verify_is_lvalue(symbol_c *lvalue) {
529
629105224e57 Stop lvalue checks after finding an error in the expression.
Mario de Sousa <msousa@fe.up.pt>
parents: 528
diff changeset
   245
	int init_error_count = error_count;  /* stop the checks once an error has been found... */
629105224e57 Stop lvalue checks after finding an error in the expression.
Mario de Sousa <msousa@fe.up.pt>
parents: 528
diff changeset
   246
	if (error_count == init_error_count)  check_assignment_to_expression(lvalue);
629105224e57 Stop lvalue checks after finding an error in the expression.
Mario de Sousa <msousa@fe.up.pt>
parents: 528
diff changeset
   247
	if (error_count == init_error_count)  check_assignment_to_controlvar(lvalue);
629105224e57 Stop lvalue checks after finding an error in the expression.
Mario de Sousa <msousa@fe.up.pt>
parents: 528
diff changeset
   248
	if (error_count == init_error_count)  check_assignment_to_output(lvalue);
629105224e57 Stop lvalue checks after finding an error in the expression.
Mario de Sousa <msousa@fe.up.pt>
parents: 528
diff changeset
   249
	if (error_count == init_error_count)  check_assignment_to_constant(lvalue);
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   250
}
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   251
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   252
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   253
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   254
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   255
/* check whether all values passed to OUT or IN_OUT parameters are legal lvalues. */
513
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   256
/*
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   257
 * All parameters being passed to the called function MUST be in the parameter list to which f_call points to!
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   258
 * This means that, for non formal function calls in IL, de current (default value) must be artificially added to the
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   259
 * beginning of the parameter list BEFORE calling handle_function_call().
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   260
 */
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   261
#include <string.h> /* required for strcmp() */
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   262
void lvalue_check_c::check_nonformal_call(symbol_c *f_call, symbol_c *f_decl) {
513
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   263
	symbol_c *call_param_value;
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   264
	identifier_c *param_name;
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   265
	function_param_iterator_c       fp_iterator(f_decl);
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   266
	function_call_param_iterator_c fcp_iterator(f_call);
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   267
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   268
	/* Iterating through the non-formal parameters of the function call */
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   269
	while((call_param_value = fcp_iterator.next_nf()) != NULL) {
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   270
		/* Iterate to the next parameter of the function being called.
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   271
		 * Get the name of that parameter, and ignore if EN or ENO.
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   272
		 */
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   273
		do {
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   274
			param_name = fp_iterator.next();
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   275
			/* If there is no other parameter declared, then we are passing too many parameters... */
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   276
			/* This error should have been caught in data type verification, so we simply abandon our check! */
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   277
			if(param_name == NULL) return;
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   278
		} while ((strcmp(param_name->value, "EN") == 0) || (strcmp(param_name->value, "ENO") == 0));
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   279
535
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   280
		/* Determine the direction (IN, OUT, IN_OUT) of the parameter... */
513
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   281
		function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   282
		
615
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   283
		/* We only process the parameter value if the paramater itself is valid... */
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   284
		if (param_name != NULL) {
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   285
			/* If the parameter is either OUT or IN_OUT, we check if 'call_param_value' is a valid lvalue */
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   286
			if ((function_param_iterator_c::direction_out == param_direction) || (function_param_iterator_c::direction_inout == param_direction)) 
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   287
				verify_is_lvalue(call_param_value);
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   288
			/* parameter values to IN parameters may be expressions with function invocations that must also be checked! */
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   289
			if (function_param_iterator_c::direction_in == param_direction) 
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   290
				call_param_value->accept(*this);  
513
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   291
		}
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   292
	}
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   293
}
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   294
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   295
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   296
99aa36a77703 Add lvalue check for non formal function invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 512
diff changeset
   297
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   298
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   299
  
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   300
/* check whether all values passed to OUT or IN_OUT parameters are legal lvalues. */
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   301
void lvalue_check_c::check_formal_call(symbol_c *f_call, symbol_c *f_decl) {
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   302
	/* if data type semantic verification was unable to determine which function is being called,
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   303
	 * then it does not make sense to go ahead and check for lvalues to unknown parameters.
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   304
	 * We simply bug out!
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   305
	 */
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   306
	if (NULL == f_decl) return;
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   307
	
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   308
	symbol_c *call_param_name;
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   309
	function_param_iterator_c       fp_iterator(f_decl);
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   310
	function_call_param_iterator_c fcp_iterator(f_call);
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   311
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   312
	/* Iterating through the formal parameters of the function call */
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   313
	while((call_param_name = fcp_iterator.next_f()) != NULL) {
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   314
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   315
		/* Obtaining the value being passed in the function call */
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   316
		symbol_c *call_param_value = fcp_iterator.get_current_value();
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   317
		if (NULL == call_param_value) ERROR;
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   318
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   319
		/* Find the corresponding parameter in function declaration, and it's direction (IN, OUT, IN_OUT) */
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   320
		identifier_c *param_name = fp_iterator.search(call_param_name);
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   321
		function_param_iterator_c::param_direction_t param_direction = fp_iterator.param_direction();
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   322
		
615
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   323
		/* We only process the parameter value if the paramater itself is valid... */
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   324
		if (param_name != NULL) {
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   325
			/* If the parameter is either OUT or IN_OUT, we check if 'call_param_value' is a valid lvalue */
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   326
			if ((function_param_iterator_c::direction_out == param_direction) || (function_param_iterator_c::direction_inout == param_direction)) 
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   327
				verify_is_lvalue(call_param_value);
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   328
			/* parameter values to IN parameters may be expressions with function invocations that must also be checked! */
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   329
			if (function_param_iterator_c::direction_in == param_direction) 
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   330
				call_param_value->accept(*this);  
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   331
		
509b79602f7c Check lvalues in expressions passed to Function/FB IN parameters.
Mario de Sousa <msousa@fe.up.pt>
parents: 557
diff changeset
   332
 		}
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   333
	}
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   334
}
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   335
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   336
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   337
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   338
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   339
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   340
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   341
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   342
/**************************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   343
/* B 1.5 - Program organisation units */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   344
/**************************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   345
/***********************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   346
/* B 1.5.1 - Functions */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   347
/***********************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   348
void *lvalue_check_c::visit(function_declaration_c *symbol) {
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   349
	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   350
	search_var_instance_decl = new search_var_instance_decl_c(symbol);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   351
	symbol->function_body->accept(*this);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   352
	delete search_varfb_instance_type;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   353
	delete search_var_instance_decl;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   354
	search_varfb_instance_type = NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   355
	search_var_instance_decl = NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   356
	return NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   357
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   358
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   359
/*****************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   360
/* B 1.5.2 - Function blocks */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   361
/*****************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   362
void *lvalue_check_c::visit(function_block_declaration_c *symbol) {
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   363
	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   364
	search_var_instance_decl = new search_var_instance_decl_c(symbol);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   365
	symbol->fblock_body->accept(*this);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   366
	delete search_varfb_instance_type;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   367
	delete search_var_instance_decl;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   368
	search_varfb_instance_type = NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   369
	search_var_instance_decl = NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   370
	return NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   371
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   372
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   373
/**********************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   374
/* B 1.5.3 - Programs */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   375
/**********************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   376
void *lvalue_check_c::visit(program_declaration_c *symbol) {
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   377
	search_varfb_instance_type = new search_varfb_instance_type_c(symbol);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   378
	search_var_instance_decl = new search_var_instance_decl_c(symbol);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   379
	symbol->function_block_body->accept(*this);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   380
	delete search_varfb_instance_type;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   381
	delete search_var_instance_decl;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   382
	search_varfb_instance_type = NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   383
	search_var_instance_decl = NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   384
	return NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   385
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   386
527
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   387
/****************************************/
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   388
/* B.2 - Language IL (Instruction List) */
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   389
/****************************************/
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   390
/***********************************/
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   391
/* B 2.1 Instructions and Operands */
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   392
/***********************************/
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   393
void *lvalue_check_c::visit(il_instruction_c *symbol) {
532
cb78940b2cb8 Remove access to NULL pointer.
Mario de Sousa <msousa@fe.up.pt>
parents: 529
diff changeset
   394
	/* il_instruction will be NULL when parsing a label with no instruction
cb78940b2cb8 Remove access to NULL pointer.
Mario de Sousa <msousa@fe.up.pt>
parents: 529
diff changeset
   395
	 * e.g.:   label1:          <---- il_instruction = NULL!
cb78940b2cb8 Remove access to NULL pointer.
Mario de Sousa <msousa@fe.up.pt>
parents: 529
diff changeset
   396
	 *                 LD 33
cb78940b2cb8 Remove access to NULL pointer.
Mario de Sousa <msousa@fe.up.pt>
parents: 529
diff changeset
   397
	 *                 ...
cb78940b2cb8 Remove access to NULL pointer.
Mario de Sousa <msousa@fe.up.pt>
parents: 529
diff changeset
   398
	 */
cb78940b2cb8 Remove access to NULL pointer.
Mario de Sousa <msousa@fe.up.pt>
parents: 529
diff changeset
   399
	if (NULL != symbol->il_instruction)
cb78940b2cb8 Remove access to NULL pointer.
Mario de Sousa <msousa@fe.up.pt>
parents: 529
diff changeset
   400
		symbol->il_instruction->accept(*this);
527
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   401
	return NULL;
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   402
}
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   403
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   404
void *lvalue_check_c::visit(il_simple_operation_c *symbol) {
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   405
	current_il_operand = symbol->il_operand;
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   406
	symbol->il_simple_operator->accept(*this);
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   407
	current_il_operand = NULL;
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   408
	return NULL;
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   409
}
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   410
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   411
535
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   412
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   413
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   414
/* | function_name [il_operand_list] */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   415
/* NOTE: The parameters 'called_function_declaration' and 'extensible_param_count' are used to pass data between the stage 3 and stage 4. */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   416
// SYM_REF2(il_function_call_c, function_name, il_operand_list, symbol_c *called_function_declaration; int extensible_param_count;)
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   417
void *lvalue_check_c::visit(il_function_call_c *symbol) {
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   418
	/* The first parameter of a non formal function call in IL will be the 'current value' (i.e. the prev_il_instruction)
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   419
	 * In order to be able to handle this without coding special cases, we will simply prepend that symbol
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   420
	 * to the il_operand_list, and remove it after calling handle_function_call().
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   421
	 *
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   422
	 * However, if no further paramters are given, then il_operand_list will be NULL, and we will
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   423
	 * need to create a new object to hold the pointer to prev_il_instruction.
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   424
	 * This change will also be undone at the end of this method.
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   425
	 */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   426
	/* TODO: Copying the location data will result in confusing error message. 
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   427
	 *       We need to make this better, by inserting code to handle this special situation explicitly!
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   428
	 */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   429
	/* NOTE: When calling a function, using the 'current value' as the first parameter of the function invocation
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   430
	 *       implies that we can only call functions whose first parameter is IN. It would not do to pass
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   431
	 *       the 'current value' to an OUT or IN_OUT parameter.
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   432
	 *       In order to make sure that this will be caught by the check_nonformal_call() function,
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   433
	 *       we add a symbol that cannot be an lvalue; in this case, a real_c (REAL literal).
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   434
	 */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   435
	real_c param_value(NULL);
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   436
	*((symbol_c *)(&param_value)) = *((symbol_c *)symbol); /* copy the symbol location (file, line, offset) data */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   437
	if (NULL == symbol->il_operand_list)  symbol->il_operand_list = new il_operand_list_c;
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   438
	if (NULL == symbol->il_operand_list)  ERROR;
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   439
	((list_c *)symbol->il_operand_list)->insert_element(&param_value, 0);
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   440
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   441
	check_nonformal_call(symbol, symbol->called_function_declaration);
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   442
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   443
	/* Undo the changes to the abstract syntax tree we made above... */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   444
	((list_c *)symbol->il_operand_list)->remove_element(0);
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   445
	if (((list_c *)symbol->il_operand_list)->n == 0) {
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   446
		/* if the list becomes empty, then that means that it did not exist before we made these changes, so we delete it! */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   447
		delete 	symbol->il_operand_list;
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   448
		symbol->il_operand_list = NULL;
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   449
	}
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   450
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   451
	return NULL;
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   452
}
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   453
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   454
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   455
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   456
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   457
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   458
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   459
/*   il_call_operator prev_declared_fb_name
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   460
 * | il_call_operator prev_declared_fb_name '(' ')'
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   461
 * | il_call_operator prev_declared_fb_name '(' eol_list ')'
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   462
 * | il_call_operator prev_declared_fb_name '(' il_operand_list ')'
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   463
 * | il_call_operator prev_declared_fb_name '(' eol_list il_param_list ')'
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   464
 */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   465
/* NOTE: The parameter 'called_fb_declaration'is used to pass data between stage 3 and stage4 (although currently it is not used in stage 4 */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   466
// SYM_REF4(il_fb_call_c, il_call_operator, fb_name, il_operand_list, il_param_list, symbol_c *called_fb_declaration)
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   467
void *lvalue_check_c::visit(il_fb_call_c *symbol) {
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   468
	if (NULL != symbol->il_operand_list)  check_nonformal_call(symbol, symbol->called_fb_declaration);
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   469
	if (NULL != symbol->  il_param_list)     check_formal_call(symbol, symbol->called_fb_declaration);
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   470
	return NULL;
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   471
}
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   472
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   473
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   474
/* | function_name '(' eol_list [il_param_list] ')' */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   475
/* NOTE: The parameter 'called_function_declaration' is used to pass data between the stage 3 and stage 4. */
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   476
// SYM_REF2(il_formal_funct_call_c, function_name, il_param_list, symbol_c *called_function_declaration; int extensible_param_count;)
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   477
void *lvalue_check_c::visit(il_formal_funct_call_c *symbol) {
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   478
	check_formal_call(symbol, symbol->called_function_declaration);
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   479
	return NULL;
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   480
}
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   481
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   482
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   483
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   484
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   485
70140bd7fe67 Add lvalue checking for IL function and FB invocations.
Mario de Sousa <msousa@fe.up.pt>
parents: 532
diff changeset
   486
527
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   487
/*******************/
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   488
/* B 2.2 Operators */
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   489
/*******************/
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   490
void *lvalue_check_c::visit(ST_operator_c *symbol) {
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   491
	verify_is_lvalue(current_il_operand);
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   492
	return NULL;
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   493
}
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   494
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   495
void *lvalue_check_c::visit(STN_operator_c *symbol) {
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   496
	verify_is_lvalue(current_il_operand);
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   497
	return NULL;
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   498
}
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   499
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   500
void *lvalue_check_c::visit(S_operator_c *symbol) {
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   501
	verify_is_lvalue(current_il_operand);
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   502
	return NULL;
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   503
}
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   504
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   505
void *lvalue_check_c::visit(R_operator_c *symbol) {
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   506
	verify_is_lvalue(current_il_operand);
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   507
	return NULL;
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   508
}
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   509
1d83209aabfe Start implement lvalue check in IL instruction.
Manuele Conti <conti.ma@alice.it>
parents: 526
diff changeset
   510
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   511
/***************************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   512
/* B.3 - Language ST (Structured Text) */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   513
/***************************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   514
/***********************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   515
/* B 3.1 - Expressions */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   516
/***********************/
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   517
// SYM_REF3(function_invocation_c, function_name, formal_param_list, nonformal_param_list, symbol_c *called_function_declaration; int extensible_param_count; std::vector <symbol_c *> candidate_functions;)
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   518
void *lvalue_check_c::visit(function_invocation_c *symbol) {
510
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   519
	if (NULL != symbol->formal_param_list   )  check_formal_call   (symbol, symbol->called_function_declaration);
9317e04c1dde Fixing check for assignment to output variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 509
diff changeset
   520
	if (NULL != symbol->nonformal_param_list)  check_nonformal_call(symbol, symbol->called_function_declaration);
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   521
	return NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   522
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   523
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   524
/*********************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   525
/* B 3.2.1 Assignment Statements */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   526
/*********************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   527
void *lvalue_check_c::visit(assignment_statement_c *symbol) {
509
35d391c38a30 Fixing some bugs in lvalue checking (other bugs remain - to be fixed later)
Mario de Sousa <msousa@fe.up.pt>
parents: 508
diff changeset
   528
	verify_is_lvalue(symbol->l_exp);
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   529
	/* We call visit r_exp to check function_call */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   530
	symbol->r_exp->accept(*this);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   531
	return NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   532
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   533
526
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   534
/*****************************************/
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   535
/* B 3.2.2 Subprogram Control Statements */
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   536
/*****************************************/
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   537
void *lvalue_check_c::visit(fb_invocation_c *symbol) {
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   538
	if (NULL != symbol->formal_param_list   )  check_formal_call   (symbol, symbol->called_fb_declaration);
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   539
	if (NULL != symbol->nonformal_param_list)  check_nonformal_call(symbol, symbol->called_fb_declaration);
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   540
	return NULL;
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   541
}
6e610449861a Add lvalue check on fb invocation.
Manuele Conti <conti.ma@alice.it>
parents: 525
diff changeset
   542
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   543
/********************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   544
/* B 3.2.4 Iteration Statements */
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   545
/********************************/
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   546
void *lvalue_check_c::visit(for_statement_c *symbol) {
557
95a2fe60a15c Add verify_is_lvalue to control_variable in for_statement.
Manuele Conti <conti.ma@alice.it>
parents: 555
diff changeset
   547
        verify_is_lvalue(symbol->control_variable);
512
f915ab676d7e Fixing check for assingment to FOR control variables.
Mario de Sousa <msousa@fe.up.pt>
parents: 510
diff changeset
   548
	control_variables.push_back(get_var_name_c::get_name(symbol->control_variable));
508
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   549
	symbol->statement_list->accept(*this);
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   550
	control_variables.pop_back();
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   551
	return NULL;
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   552
}
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   553
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   554
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   555
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   556
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   557
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   558
dc6906338042 Add lvalue check class.
Manuele Conti <conti.ma@alice.it>
parents:
diff changeset
   559