bytecode.cpp revision 0:a61af66fc99e
1/* 2 * Copyright 1997-2002 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, 20 * CA 95054 USA or visit www.sun.com if you need additional information or 21 * have any questions. 22 * 23 */ 24 25#include "incls/_precompiled.incl" 26#include "incls/_bytecode.cpp.incl" 27 28// Implementation of Bytecode 29// Should eventually get rid of these functions and use ThisRelativeObj methods instead 30 31void Bytecode::set_code(Bytecodes::Code code) { 32 Bytecodes::check(code); 33 *addr_at(0) = u_char(code); 34} 35 36 37void Bytecode::set_fast_index(int i) { 38 assert(0 <= i && i < 0x10000, "illegal index value"); 39 Bytes::put_native_u2(addr_at(1), (jushort)i); 40} 41 42 43bool Bytecode::check_must_rewrite() const { 44 assert(Bytecodes::can_rewrite(code()), "post-check only"); 45 46 // Some codes are conditionally rewriting. Look closely at them. 47 switch (code()) { 48 case Bytecodes::_aload_0: 49 // Even if RewriteFrequentPairs is turned on, 50 // the _aload_0 code might delay its rewrite until 51 // a following _getfield rewrites itself. 52 return false; 53 54 case Bytecodes::_lookupswitch: 55 return false; // the rewrite is not done by the interpreter 56 57 case Bytecodes::_new: 58 // (Could actually look at the class here, but the profit would be small.) 59 return false; // the rewrite is not always done 60 } 61 62 // No other special cases. 63 return true; 64} 65 66 67 68// Implementation of Bytecode_tableupswitch 69 70int Bytecode_tableswitch::dest_offset_at(int i) const { 71 address x = aligned_addr_at(1); 72 int x2 = aligned_offset(1 + (3 + i)*jintSize); 73 int val = java_signed_word_at(x2); 74 return java_signed_word_at(aligned_offset(1 + (3 + i)*jintSize)); 75} 76 77 78// Implementation of Bytecode_invoke 79 80void Bytecode_invoke::verify() const { 81 Bytecodes::Code bc = adjusted_invoke_code(); 82 assert(is_valid(), "check invoke"); 83} 84 85 86symbolOop Bytecode_invoke::signature() const { 87 constantPoolOop constants = method()->constants(); 88 return constants->signature_ref_at(index()); 89} 90 91 92symbolOop Bytecode_invoke::name() const { 93 constantPoolOop constants = method()->constants(); 94 return constants->name_ref_at(index()); 95} 96 97 98BasicType Bytecode_invoke::result_type(Thread *thread) const { 99 symbolHandle sh(thread, signature()); 100 ResultTypeFinder rts(sh); 101 rts.iterate(); 102 return rts.type(); 103} 104 105 106methodHandle Bytecode_invoke::static_target(TRAPS) { 107 methodHandle m; 108 KlassHandle resolved_klass; 109 constantPoolHandle constants(THREAD, _method->constants()); 110 111 if (adjusted_invoke_code() != Bytecodes::_invokeinterface) { 112 LinkResolver::resolve_method(m, resolved_klass, constants, index(), CHECK_(methodHandle())); 113 } else { 114 LinkResolver::resolve_interface_method(m, resolved_klass, constants, index(), CHECK_(methodHandle())); 115 } 116 return m; 117} 118 119 120int Bytecode_invoke::index() const { 121 return Bytes::get_Java_u2(bcp() + 1); 122} 123 124 125// Implementation of Bytecode_static 126 127void Bytecode_static::verify() const { 128 assert(Bytecodes::java_code(code()) == Bytecodes::_putstatic 129 || Bytecodes::java_code(code()) == Bytecodes::_getstatic, "check static"); 130} 131 132 133BasicType Bytecode_static::result_type(methodOop method) const { 134 int index = java_hwrd_at(1); 135 constantPoolOop constants = method->constants(); 136 symbolOop field_type = constants->signature_ref_at(index); 137 BasicType basic_type = FieldType::basic_type(field_type); 138 return basic_type; 139} 140 141 142// Implementation of Bytecode_field 143 144void Bytecode_field::verify() const { 145 Bytecodes::Code stdc = Bytecodes::java_code(code()); 146 assert(stdc == Bytecodes::_putstatic || stdc == Bytecodes::_getstatic || 147 stdc == Bytecodes::_putfield || stdc == Bytecodes::_getfield, "check field"); 148} 149 150 151bool Bytecode_field::is_static() const { 152 Bytecodes::Code stdc = Bytecodes::java_code(code()); 153 return stdc == Bytecodes::_putstatic || stdc == Bytecodes::_getstatic; 154} 155 156 157int Bytecode_field::index() const { 158 return java_hwrd_at(1); 159} 160 161 162// Implementation of Bytecodes loac constant 163 164int Bytecode_loadconstant::index() const { 165 Bytecodes::Code stdc = Bytecodes::java_code(code()); 166 return stdc == Bytecodes::_ldc ? java_byte_at(1) : java_hwrd_at(1); 167} 168 169//------------------------------------------------------------------------------ 170// Non-product code 171 172#ifndef PRODUCT 173 174void Bytecode_lookupswitch::verify() const { 175 switch (Bytecodes::java_code(code())) { 176 case Bytecodes::_lookupswitch: 177 { int i = number_of_pairs() - 1; 178 while (i-- > 0) { 179 assert(pair_at(i)->match() < pair_at(i+1)->match(), "unsorted table entries"); 180 } 181 } 182 break; 183 default: 184 fatal("not a lookupswitch bytecode"); 185 } 186} 187 188void Bytecode_tableswitch::verify() const { 189 switch (Bytecodes::java_code(code())) { 190 case Bytecodes::_tableswitch: 191 { int lo = low_key(); 192 int hi = high_key(); 193 assert (hi >= lo, "incorrect hi/lo values in tableswitch"); 194 int i = hi - lo - 1 ; 195 while (i-- > 0) { 196 // no special check needed 197 } 198 } 199 break; 200 default: 201 fatal("not a tableswitch bytecode"); 202 } 203} 204 205#endif 206