1 /*
   2  * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "classfile/systemDictionary.hpp"
  27 #include "memory/oopFactory.hpp"
  28 #include "oops/oop.inline.hpp"
  29 #include "oops/typeArrayKlass.hpp"
  30 #include "runtime/fieldType.hpp"
  31 #include "runtime/signature.hpp"
  32 
  33 void FieldType::skip_optional_size(Symbol* signature, int* index) {
  34   jchar c = signature->byte_at(*index);
  35   while (c >= '0' && c <= '9') {
  36     *index = *index + 1;
  37     c = signature->byte_at(*index);
  38   }
  39 }
  40 
  41 BasicType FieldType::basic_type(Symbol* signature) {
  42   return char2type(signature->byte_at(0));
  43 }
  44 
  45 // Check if it is a valid array signature
  46 bool FieldType::is_valid_array_signature(Symbol* sig) {
  47   assert(sig->utf8_length() > 1, "this should already have been checked");
  48   assert(sig->byte_at(0) == '[', "this should already have been checked");
  49   // The first character is already checked
  50   int i = 1;
  51   int len = sig->utf8_length();
  52   // First skip all '['s
  53   while(i < len - 1 && sig->byte_at(i) == '[') i++;
  54 
  55   // Check type
  56   switch(sig->byte_at(i)) {
  57     case 'B': // T_BYTE
  58     case 'C': // T_CHAR
  59     case 'D': // T_DOUBLE
  60     case 'F': // T_FLOAT
  61     case 'I': // T_INT
  62     case 'J': // T_LONG
  63     case 'S': // T_SHORT
  64     case 'Z': // T_BOOLEAN
  65       // If it is an array, the type is the last character
  66       return (i + 1 == len);
  67     case 'L':
  68       // If it is an object, the last character must be a ';'
  69       return sig->byte_at(len - 1) == ';';
  70   }
  71 
  72   return false;
  73 }
  74 
  75 
  76 BasicType FieldType::get_array_info(Symbol* signature, FieldArrayInfo& fd, TRAPS) {
  77   assert(basic_type(signature) == T_ARRAY, "must be array");
  78   int index = 1;
  79   int dim   = 1;
  80   skip_optional_size(signature, &index);
  81   while (signature->byte_at(index) == '[') {
  82     index++;
  83     dim++;
  84     skip_optional_size(signature, &index);
  85   }
  86   ResourceMark rm;
  87   char *element = signature->as_C_string() + index;
  88   BasicType element_type = char2type(element[0]);
  89   if (element_type == T_OBJECT) {
  90     int len = (int)strlen(element);
  91     assert(element[len-1] == ';', "last char should be a semicolon");
  92     element[len-1] = '\0';        // chop off semicolon
  93     fd._object_key = SymbolTable::new_symbol(element + 1, CHECK_(T_BYTE));
  94   }
  95   // Pass dimension back to caller
  96   fd._dimension = dim;
  97   return element_type;
  98 }