1 /* 2 * Copyright (c) 1997, 2016, 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 "memory/resourceArea.hpp" 29 #include "oops/oop.inline.hpp" 30 #include "oops/typeArrayKlass.hpp" 31 #include "runtime/fieldType.hpp" 32 #include "runtime/signature.hpp" 33 34 void FieldType::skip_optional_size(Symbol* signature, int* index) { 35 jchar c = signature->byte_at(*index); 36 while (c >= '0' && c <= '9') { 37 *index = *index + 1; 38 c = signature->byte_at(*index); 39 } 40 } 41 42 BasicType FieldType::basic_type(Symbol* signature) { 43 return char2type(signature->byte_at(0)); 44 } 45 46 // Check if it is a valid array signature 47 bool FieldType::is_valid_array_signature(Symbol* sig) { 48 assert(sig->utf8_length() > 1, "this should already have been checked"); 49 assert(sig->byte_at(0) == '[', "this should already have been checked"); 50 // The first character is already checked 51 int i = 1; 52 int len = sig->utf8_length(); 53 // First skip all '['s 54 while(i < len - 1 && sig->byte_at(i) == '[') i++; 55 56 // Check type 57 switch(sig->byte_at(i)) { 58 case 'B': // T_BYTE 59 case 'C': // T_CHAR 60 case 'D': // T_DOUBLE 61 case 'F': // T_FLOAT 62 case 'I': // T_INT 63 case 'J': // T_LONG 64 case 'S': // T_SHORT 65 case 'Z': // T_BOOLEAN 66 // If it is an array, the type is the last character 67 return (i + 1 == len); 68 case 'L': 69 case 'Q': 70 // If it is an object or a value type, the last character must be a ';' 71 return sig->byte_at(len - 1) == ';'; 72 } 73 74 return false; 75 } 76 77 static const char dvt_postfix[] = "$Value"; 78 static const int dvt_postfix_len = 6; 79 80 bool FieldType::is_dvt_postfix(Symbol* signature) { 81 assert(strlen(dvt_postfix) == dvt_postfix_len, "Invariant"); 82 int sig_length = signature->utf8_length(); 83 int pos = sig_length - dvt_postfix_len; 84 if (pos <= 0) { 85 return false; 86 } 87 for (int i = 0; i < dvt_postfix_len; i++) { 88 if (signature->byte_at(pos) != dvt_postfix[i]) { 89 return false; 90 } 91 pos++; 92 } 93 return true; 94 } 95 96 char* FieldType::dvt_unmangle_vcc(Symbol* signature) { 97 assert(is_dvt_postfix(signature), "Unmangle that which is not managled"); 98 char* str = signature->as_C_string(); 99 str[signature->utf8_length() -dvt_postfix_len] = '\0'; 100 return str; 101 } 102 103 BasicType FieldType::get_array_info(Symbol* signature, FieldArrayInfo& fd, TRAPS) { 104 assert(basic_type(signature) == T_ARRAY, "must be array"); 105 int index = 1; 106 int dim = 1; 107 skip_optional_size(signature, &index); 108 while (signature->byte_at(index) == '[') { 109 index++; 110 dim++; 111 skip_optional_size(signature, &index); 112 } 113 ResourceMark rm; 114 char *element = signature->as_C_string() + index; 115 BasicType element_type = char2type(element[0]); 116 if (element_type == T_OBJECT || element_type == T_VALUETYPE) { 117 int len = (int)strlen(element); 118 assert(element[len-1] == ';', "last char should be a semicolon"); 119 element[len-1] = '\0'; // chop off semicolon 120 fd._object_key = SymbolTable::new_symbol(element + 1, CHECK_(T_BYTE)); 121 } 122 // Pass dimension back to caller 123 fd._dimension = dim; 124 return element_type; 125 }