text: /*
   * Copyright (C) 2012 Oracle.
   *
   * This program is free software; you can redistribute it and/or
   * modify it under the terms of the GNU General Public License
   * as published by the Free Software Foundation; either version 2
   * of the License, or (at your option) any later version.
   *
   * This program is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   * GNU General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; if not, see http://www.gnu.org/copyleft/gpl.txt
   */
  
  #include "smatch.h"
  #include "smatch_extra.h"
  
  static int my_id;
  
  static void match_shift_mask(struct expression *expr)
  {
  	struct expression *right, *shifter;
  	struct range_list *rl;
  	char *str;
  
  	expr = strip_expr(expr);
  	if (expr->type != EXPR_BINOP || expr->op != '&')
  		return;
  
  	if (get_type(expr->left) != &ullong_ctype)
  		return;
  
  	if (type_bits(get_type(expr->right)) == 64)
  		return;
  
  	right = strip_expr(expr->right);
  	if (right->type != EXPR_BINOP || right->op != SPECIAL_LEFTSHIFT)
  		return;
  
  	shifter = strip_expr(right->right);
  	get_real_absolute_rl(shifter, &rl);
  	if (rl_max(rl).uvalue < 32)
  		return;
  
  	str = expr_to_str(expr->right);
  	sm_warning("should '%s' be a 64 bit type?", str);
  	free_string(str);
  }
  
  static void match_shift_assignment(struct expression *expr)
  {
  	struct symbol *left_type, *right_type;
  	struct expression *right;
  	sval_t sval;
  	sval_t bits, shifter;
  	char *name;
  
  	right = strip_expr(expr->right);
  	if (right->type != EXPR_BINOP || right->op != SPECIAL_LEFTSHIFT)
  		return;
  
  	left_type = get_type(expr->left);
  	if (left_type != &llong_ctype && left_type != &ullong_ctype)
  		return;
  
  	right_type = get_type(expr->right);
  
  	if (type_bits(right_type) == 64)
  		return;
  
  	if (get_value(right, &sval))
  		return;
  
  	get_absolute_max(right->left, &bits);
  	get_absolute_max(right->right, &shifter);
  
  	bits = sval_cast(&ullong_ctype, bits);
  	if (sval_cmp_val(shifter, 32) < 0) {
  		sval = sval_binop(bits, SPECIAL_LEFTSHIFT, shifter);
  		if (sval_cmp_val(sval, UINT_MAX) < 0)
  			return;
  	}
  
  	name = expr_to_str_sym(right, NULL);
  	sm_warning("should '%s' be a 64 bit type?", name);
  	free_string(name);
  }
  
  void check_64bit_shift(int id)
  {
  	my_id = id;
  
  	add_hook(&match_shift_assignment, ASSIGNMENT_HOOK);
  	add_hook(&match_shift_mask, BINOP_HOOK);
  }
  