1 /* 2 * Copyright (c) 1999, 2010, 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 "ci/ciArray.hpp" 27 #include "ci/ciArrayKlass.hpp" 28 #include "ci/ciConstant.hpp" 29 #include "ci/ciKlass.hpp" 30 #include "ci/ciUtilities.hpp" 31 #include "oops/objArrayOop.hpp" 32 #include "oops/typeArrayOop.hpp" 33 34 // ciArray 35 // 36 // This class represents an arrayOop in the HotSpot virtual 37 // machine. 38 static BasicType fixup_element_type(BasicType bt) { 39 if (bt == T_ARRAY) return T_OBJECT; 40 if (bt == T_BOOLEAN) return T_BYTE; 41 return bt; 42 } 43 44 ciConstant ciArray::element_value_impl(BasicType elembt, 45 arrayOop ary, 46 int index) { 47 if (ary == NULL) 48 return ciConstant(); 49 assert(ary->is_array(), ""); 50 if (index < 0 || index >= ary->length()) 51 return ciConstant(); 52 ArrayKlass* ak = (ArrayKlass*) ary->klass(); 53 BasicType abt = ak->element_type(); 54 if (fixup_element_type(elembt) != 55 fixup_element_type(abt)) 56 return ciConstant(); 57 switch (elembt) { 58 case T_ARRAY: 59 case T_OBJECT: 60 { 61 assert(ary->is_objArray(), ""); 62 objArrayOop objary = (objArrayOop) ary; 63 oop elem = objary->obj_at(index); 64 ciEnv* env = CURRENT_ENV; 65 ciObject* box = env->get_object(elem); 66 return ciConstant(T_OBJECT, box); 67 } 68 } 69 assert(ary->is_typeArray(), ""); 70 typeArrayOop tary = (typeArrayOop) ary; 71 jint value = 0; 72 switch (elembt) { 73 case T_LONG: return ciConstant(tary->long_at(index)); 74 case T_FLOAT: return ciConstant(tary->float_at(index)); 75 case T_DOUBLE: return ciConstant(tary->double_at(index)); 76 default: return ciConstant(); 77 case T_BYTE: value = tary->byte_at(index); break; 78 case T_BOOLEAN: value = tary->byte_at(index) & 1; break; 79 case T_SHORT: value = tary->short_at(index); break; 80 case T_CHAR: value = tary->char_at(index); break; 81 case T_INT: value = tary->int_at(index); break; 82 } 83 return ciConstant(elembt, value); 84 } 85 86 // ------------------------------------------------------------------ 87 // ciArray::element_value 88 // 89 // Current value of an element. 90 // Returns T_ILLEGAL if there is no element at the given index. 91 ciConstant ciArray::element_value(int index) { 92 BasicType elembt = element_basic_type(); 93 GUARDED_VM_ENTRY( 94 return element_value_impl(elembt, get_arrayOop(), index); 95 ) 96 } 97 98 // ------------------------------------------------------------------ 99 // ciArray::element_value_by_offset 100 // 101 // Current value of an element at the specified offset. 102 // Returns T_ILLEGAL if there is no element at the given offset. 103 ciConstant ciArray::element_value_by_offset(intptr_t element_offset) { 104 BasicType elembt = element_basic_type(); 105 intptr_t shift = exact_log2(type2aelembytes(elembt)); 106 intptr_t header = arrayOopDesc::base_offset_in_bytes(elembt); 107 intptr_t index = (element_offset - header) >> shift; 108 intptr_t offset = header + ((intptr_t)index << shift); 109 if (offset != element_offset || index != (jint)index) 110 return ciConstant(); 111 return element_value((jint) index); 112 } 113 114 // ------------------------------------------------------------------ 115 // ciArray::print_impl 116 // 117 // Implementation of the print method. 118 void ciArray::print_impl(outputStream* st) { 119 st->print(" length=%d type=", length()); 120 klass()->print(st); 121 }