vala/valaintegerliteral.vala

   1 /* valaintegerliteral.vala
   2  *
   3  * Copyright (C) 2006-2010  Jürg Billeter
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2.1 of the License, or (at your option) any later version.
   9
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  18  *
  19  * Author:
  20  *      Jürg Billeter <j@bitron.ch>
  21  */
  22
  23 using GLib;
  24
  25 /**
  26  * Represents an integer literal in the source code.
  27  */
  28 public class Vala.IntegerLiteral : Literal {
  29         /**
  30          * The literal value.
  31          */
  32         public string value { get; set; }
  33
  34         public string type_suffix { get; set; }
  35
  36         /**
  37          * Creates a new integer literal.
  38          *
  39          * @param i      literal value
  40          * @param source reference to source code
  41          * @return       newly created integer literal
  42          */
  43         public IntegerLiteral (string i, SourceReference? source = null) {
  44                 value = i;
  45                 source_reference = source;
  46         }
  47
  48         public override void accept (CodeVisitor visitor) {
  49                 visitor.visit_integer_literal (this);
  50
  51                 visitor.visit_expression (this);
  52         }
  53
  54         public override string to_string () {
  55                 return value;
  56         }
  57
  58         public override bool is_pure () {
  59                 return true;
  60         }
  61
  62         public override bool check (CodeContext context) {
  63                 if (checked) {
  64                         return !error;
  65                 }
  66
  67                 checked = true;
  68
  69                 int l = 0;
  70                 while (value.has_suffix ("l") || value.has_suffix ("L")) {
  71                         l++;
  72                         value = value.substring (0, value.length - 1);
  73                 }
  74
  75                 bool u = false;
  76                 if (value.has_suffix ("u") || value.has_suffix ("U")) {
  77                         u = true;
  78                         value = value.substring (0, value.length - 1);
  79                 }
  80
  81                 int64 n = int64.parse (value);
  82                 if (!u && (n > int.MAX || n < int.MIN)) {
  83                         // value doesn't fit into signed 32-bit
  84                         l = 2;
  85                 } else if (u && n > uint.MAX) {
  86                         // value doesn't fit into unsigned 32-bit
  87                         l = 2;
  88                 }
  89
  90                 string type_name;
  91                 if (l == 0) {
  92                         if (u) {
  93                                 type_suffix = "U";
  94                                 type_name = "uint";
  95                         } else {
  96                                 type_suffix = "";
  97                                 type_name = "int";
  98                         }
  99                 } else if (l == 1) {
 100                         if (u) {
 101                                 type_suffix = "UL";
 102                                 type_name = "ulong";
 103                         } else {
 104                                 type_suffix = "L";
 105                                 type_name = "long";
 106                         }
 107                 } else {
 108                         if (u) {
 109                                 type_suffix = "ULL";
 110                                 type_name = "uint64";
 111                         } else {
 112                                 type_suffix = "LL";
 113                                 type_name = "int64";
 114                         }
 115                 }
 116
 117                 var st = (Struct) context.root.scope.lookup (type_name);
 118                 // ensure attributes are already processed
 119                 st.check (context);
 120
 121                 value_type = new IntegerType (st, value, type_name);
 122
 123                 return !error;
 124         }
 125
 126         public override void emit (CodeGenerator codegen) {
 127                 codegen.visit_integer_literal (this);
 128
 129                 codegen.visit_expression (this);
 130         }
 131 }