1 /* 2 * Copyright (c) 1999, 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 "ci/ciMethodType.hpp" 27 #include "ci/ciSignature.hpp" 28 #include "ci/ciUtilities.hpp" 29 #include "memory/allocation.inline.hpp" 30 #include "memory/resourceArea.hpp" 31 #include "oops/oop.inline.hpp" 32 #include "runtime/signature.hpp" 33 34 // ciSignature 35 // 36 // This class represents the signature of a method. 37 38 // ------------------------------------------------------------------ 39 // ciSignature::ciSignature 40 ciSignature::ciSignature(ciKlass* accessing_klass, const constantPoolHandle& cpool, ciSymbol* symbol) { 41 ASSERT_IN_VM; 42 EXCEPTION_CONTEXT; 43 _accessing_klass = accessing_klass; 44 _symbol = symbol; 45 46 ciEnv* env = CURRENT_ENV; 47 Arena* arena = env->arena(); 48 _types = new (arena) GrowableArray<ciType*>(arena, 8, 0, NULL); 49 50 int size = 0; 51 int count = 0; 52 ResourceMark rm(THREAD); 53 Symbol* sh = symbol->get_symbol(); 54 SignatureStream ss(sh); 55 for (; ; ss.next()) { 56 // Process one element of the signature 57 ciType* type; 58 if (!ss.is_object()) { 59 type = ciType::make(ss.type()); 60 } else { 61 Symbol* name = ss.as_symbol(THREAD); 62 if (HAS_PENDING_EXCEPTION) { 63 type = ss.is_array() ? (ciType*)ciEnv::unloaded_ciobjarrayklass() 64 : (ciType*)ciEnv::unloaded_ciinstance_klass(); 65 env->record_out_of_memory_failure(); 66 CLEAR_PENDING_EXCEPTION; 67 } else { 68 ciSymbol* klass_name = env->get_symbol(name); 69 type = env->get_klass_by_name_impl(_accessing_klass, cpool, klass_name, false); 70 } 71 } 72 _types->append(type); 73 if (ss.at_return_type()) { 74 // Done processing the return type; do not add it into the count. 75 break; 76 } 77 size += type->size(); 78 count++; 79 } 80 _size = size; 81 _count = count; 82 } 83 84 // ------------------------------------------------------------------ 85 // ciSignature::ciSignature 86 ciSignature::ciSignature(ciKlass* accessing_klass, ciSymbol* symbol, ciMethodType* method_type) : 87 _symbol(symbol), 88 _accessing_klass(accessing_klass), 89 _size( method_type->ptype_slot_count()), 90 _count(method_type->ptype_count()) 91 { 92 ASSERT_IN_VM; 93 EXCEPTION_CONTEXT; 94 Arena* arena = CURRENT_ENV->arena(); 95 _types = new (arena) GrowableArray<ciType*>(arena, _count + 1, 0, NULL); 96 for (int i = 0; i < _count; i++) { 97 _types->append(method_type->ptype_at(i)); 98 } 99 _types->append(method_type->rtype()); 100 } 101 102 // ------------------------------------------------------------------ 103 // ciSignature::return_type 104 // 105 // What is the return type of this signature? 106 ciType* ciSignature::return_type() const { 107 return _types->at(_count); 108 } 109 110 // ------------------------------------------------------------------ 111 // ciSignature::type_at 112 // 113 // What is the type of the index'th element of this 114 // signature? 115 ciType* ciSignature::type_at(int index) const { 116 assert(index < _count, "out of bounds"); 117 // The first _klasses element holds the return klass. 118 return _types->at(index); 119 } 120 121 // ------------------------------------------------------------------ 122 // ciSignature::equals 123 // 124 // Compare this signature to another one. Signatures with different 125 // accessing classes but with signature-types resolved to the same 126 // types are defined to be equal. 127 bool ciSignature::equals(ciSignature* that) { 128 // Compare signature 129 if (!this->as_symbol()->equals(that->as_symbol())) return false; 130 // Compare all types of the arguments 131 for (int i = 0; i < _count; i++) { 132 if (this->type_at(i) != that->type_at(i)) return false; 133 } 134 // Compare the return type 135 if (this->return_type() != that->return_type()) return false; 136 return true; 137 } 138 139 // ------------------------------------------------------------------ 140 // ciSignature::print_signature 141 void ciSignature::print_signature() { 142 _symbol->print_symbol(); 143 } 144 145 // ------------------------------------------------------------------ 146 // ciSignature::print 147 void ciSignature::print() { 148 tty->print("<ciSignature symbol="); 149 print_signature(); 150 tty->print(" accessing_klass="); 151 _accessing_klass->print(); 152 tty->print(" address=" INTPTR_FORMAT ">", p2i((address)this)); 153 }