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annotate src/share/vm/interpreter/rewriter.cpp @ 1552:c18cbe5936b8

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6941466: Oracle rebranding changes for Hotspot repositories Summary: Change all the Sun copyrights to Oracle copyright Reviewed-by: ohair
author trims
date Thu, 27 May 2010 19:08:38 -0700
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children e9ff18c4ace7
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1 /*
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2 * Copyright (c) 1998, 2009, Oracle and/or its affiliates. All rights reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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20 * or visit www.oracle.com if you need additional information or have any
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21 * questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_rewriter.cpp.incl"
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27
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28 // Computes a CPC map (new_index -> original_index) for constant pool entries
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29 // that are referred to by the interpreter at runtime via the constant pool cache.
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30 // Also computes a CP map (original_index -> new_index).
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31 // Marks entries in CP which require additional processing.
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32 void Rewriter::compute_index_maps() {
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33 const int length = _pool->length();
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34 init_cp_map(length);
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35 for (int i = 0; i < length; i++) {
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36 int tag = _pool->tag_at(i).value();
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37 switch (tag) {
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38 case JVM_CONSTANT_InterfaceMethodref:
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39 case JVM_CONSTANT_Fieldref : // fall through
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40 case JVM_CONSTANT_Methodref : // fall through
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41 add_cp_cache_entry(i);
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42 break;
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43 }
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44 }
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46 guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1),
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47 "all cp cache indexes fit in a u2");
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48 }
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49
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50
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51 // Creates a constant pool cache given a CPC map
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52 // This creates the constant pool cache initially in a state
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53 // that is unsafe for concurrent GC processing but sets it to
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54 // a safe mode before the constant pool cache is returned.
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55 void Rewriter::make_constant_pool_cache(TRAPS) {
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56 const int length = _cp_cache_map.length();
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57 constantPoolCacheOop cache =
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58 oopFactory::new_constantPoolCache(length, methodOopDesc::IsUnsafeConc, CHECK);
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59 cache->initialize(_cp_cache_map);
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60 _pool->set_cache(cache);
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61 cache->set_constant_pool(_pool());
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62 }
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63
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64
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65
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66 // The new finalization semantics says that registration of
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67 // finalizable objects must be performed on successful return from the
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68 // Object.<init> constructor. We could implement this trivially if
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69 // <init> were never rewritten but since JVMTI allows this to occur, a
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70 // more complicated solution is required. A special return bytecode
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71 // is used only by Object.<init> to signal the finalization
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72 // registration point. Additionally local 0 must be preserved so it's
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73 // available to pass to the registration function. For simplicty we
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74 // require that local 0 is never overwritten so it's available as an
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75 // argument for registration.
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76
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77 void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) {
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78 RawBytecodeStream bcs(method);
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79 while (!bcs.is_last_bytecode()) {
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80 Bytecodes::Code opcode = bcs.raw_next();
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81 switch (opcode) {
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82 case Bytecodes::_return: *bcs.bcp() = Bytecodes::_return_register_finalizer; break;
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83
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84 case Bytecodes::_istore:
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85 case Bytecodes::_lstore:
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86 case Bytecodes::_fstore:
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87 case Bytecodes::_dstore:
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88 case Bytecodes::_astore:
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89 if (bcs.get_index() != 0) continue;
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90
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91 // fall through
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92 case Bytecodes::_istore_0:
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93 case Bytecodes::_lstore_0:
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94 case Bytecodes::_fstore_0:
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95 case Bytecodes::_dstore_0:
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96 case Bytecodes::_astore_0:
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97 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
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98 "can't overwrite local 0 in Object.<init>");
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99 break;
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100 }
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101 }
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102 }
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103
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104
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105 // Rewrite a classfile-order CP index into a native-order CPC index.
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106 int Rewriter::rewrite_member_reference(address bcp, int offset) {
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107 address p = bcp + offset;
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108 int cp_index = Bytes::get_Java_u2(p);
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109 int cache_index = cp_entry_to_cp_cache(cp_index);
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110 Bytes::put_native_u2(p, cache_index);
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111 return cp_index;
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112 }
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113
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114
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115 void Rewriter::rewrite_invokedynamic(address bcp, int offset, int delete_me) {
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116 address p = bcp + offset;
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117 assert(p[-1] == Bytecodes::_invokedynamic, "");
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118 int cp_index = Bytes::get_Java_u2(p);
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119 int cpc = maybe_add_cp_cache_entry(cp_index); // add lazily
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120 int cpc2 = add_secondary_cp_cache_entry(cpc);
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121
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122 // Replace the trailing four bytes with a CPC index for the dynamic
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123 // call site. Unlike other CPC entries, there is one per bytecode,
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124 // not just one per distinct CP entry. In other words, the
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125 // CPC-to-CP relation is many-to-one for invokedynamic entries.
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126 // This means we must use a larger index size than u2 to address
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127 // all these entries. That is the main reason invokedynamic
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128 // must have a five-byte instruction format. (Of course, other JVM
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129 // implementations can use the bytes for other purposes.)
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130 Bytes::put_native_u4(p, constantPoolCacheOopDesc::encode_secondary_index(cpc2));
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131 // Note: We use native_u4 format exclusively for 4-byte indexes.
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132 }
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133
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134
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135 // Rewrites a method given the index_map information
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136 void Rewriter::scan_method(methodOop method) {
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137
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138 int nof_jsrs = 0;
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139 bool has_monitor_bytecodes = false;
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140
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141 {
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142 // We cannot tolerate a GC in this block, because we've
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143 // cached the bytecodes in 'code_base'. If the methodOop
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144 // moves, the bytecodes will also move.
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145 No_Safepoint_Verifier nsv;
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146 Bytecodes::Code c;
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147
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148 // Bytecodes and their length
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149 const address code_base = method->code_base();
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150 const int code_length = method->code_size();
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151
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152 int bc_length;
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153 for (int bci = 0; bci < code_length; bci += bc_length) {
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154 address bcp = code_base + bci;
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155 int prefix_length = 0;
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156 c = (Bytecodes::Code)(*bcp);
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157
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158 // Since we have the code, see if we can get the length
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159 // directly. Some more complicated bytecodes will report
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160 // a length of zero, meaning we need to make another method
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161 // call to calculate the length.
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162 bc_length = Bytecodes::length_for(c);
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163 if (bc_length == 0) {
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164 bc_length = Bytecodes::length_at(bcp);
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165
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166 // length_at will put us at the bytecode after the one modified
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167 // by 'wide'. We don't currently examine any of the bytecodes
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168 // modified by wide, but in case we do in the future...
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169 if (c == Bytecodes::_wide) {
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170 prefix_length = 1;
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171 c = (Bytecodes::Code)bcp[1];
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172 }
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173 }
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174
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175 assert(bc_length != 0, "impossible bytecode length");
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176
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177 switch (c) {
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178 case Bytecodes::_lookupswitch : {
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179 #ifndef CC_INTERP
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180 Bytecode_lookupswitch* bc = Bytecode_lookupswitch_at(bcp);
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181 bc->set_code(
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182 bc->number_of_pairs() < BinarySwitchThreshold
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183 ? Bytecodes::_fast_linearswitch
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184 : Bytecodes::_fast_binaryswitch
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185 );
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186 #endif
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187 break;
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188 }
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189 case Bytecodes::_getstatic : // fall through
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190 case Bytecodes::_putstatic : // fall through
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191 case Bytecodes::_getfield : // fall through
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192 case Bytecodes::_putfield : // fall through
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193 case Bytecodes::_invokevirtual : // fall through
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194 case Bytecodes::_invokespecial : // fall through
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195 case Bytecodes::_invokestatic :
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196 case Bytecodes::_invokeinterface:
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197 rewrite_member_reference(bcp, prefix_length+1);
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198 break;
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199 case Bytecodes::_invokedynamic:
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200 rewrite_invokedynamic(bcp, prefix_length+1, int(sizeof"@@@@DELETE ME"));
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201 break;
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202 case Bytecodes::_jsr : // fall through
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203 case Bytecodes::_jsr_w : nof_jsrs++; break;
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204 case Bytecodes::_monitorenter : // fall through
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205 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break;
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206 }
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207 }
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208 }
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209
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210 // Update access flags
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211 if (has_monitor_bytecodes) {
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212 method->set_has_monitor_bytecodes();
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213 }
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214
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215 // The present of a jsr bytecode implies that the method might potentially
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216 // have to be rewritten, so we run the oopMapGenerator on the method
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217 if (nof_jsrs > 0) {
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218 method->set_has_jsrs();
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219 // Second pass will revisit this method.
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220 assert(method->has_jsrs(), "");
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221 }
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222 }
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223
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224 // After constant pool is created, revisit methods containing jsrs.
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225 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) {
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226 ResolveOopMapConflicts romc(method);
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227 methodHandle original_method = method;
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228 method = romc.do_potential_rewrite(CHECK_(methodHandle()));
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229 if (method() != original_method()) {
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230 // Insert invalid bytecode into original methodOop and set
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231 // interpreter entrypoint, so that a executing this method
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232 // will manifest itself in an easy recognizable form.
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233 address bcp = original_method->bcp_from(0);
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234 *bcp = (u1)Bytecodes::_shouldnotreachhere;
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235 int kind = Interpreter::method_kind(original_method);
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236 original_method->set_interpreter_kind(kind);
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237 }
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238
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239 // Update monitor matching info.
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240 if (romc.monitor_safe()) {
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241 method->set_guaranteed_monitor_matching();
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242 }
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243
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244 return method;
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245 }
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246
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247
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248 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) {
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249 ResourceMark rm(THREAD);
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250 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK);
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251 // (That's all, folks.)
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252 }
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253
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254
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255 void Rewriter::rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) {
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256 ResourceMark rm(THREAD);
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257 Rewriter rw(klass, cpool, methods, CHECK);
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258 // (That's all, folks.)
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259 }
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260
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261
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262 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS)
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263 : _klass(klass),
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264 _pool(cpool),
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265 _methods(methods)
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266 {
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267 assert(_pool->cache() == NULL, "constant pool cache must not be set yet");
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268
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269 // determine index maps for methodOop rewriting
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270 compute_index_maps();
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271
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272 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) {
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273 bool did_rewrite = false;
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274 int i = _methods->length();
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275 while (i-- > 0) {
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276 methodOop method = (methodOop)_methods->obj_at(i);
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277 if (method->intrinsic_id() == vmIntrinsics::_Object_init) {
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278 // rewrite the return bytecodes of Object.<init> to register the
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279 // object for finalization if needed.
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280 methodHandle m(THREAD, method);
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281 rewrite_Object_init(m, CHECK);
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282 did_rewrite = true;
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283 break;
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284 }
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285 }
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286 assert(did_rewrite, "must find Object::<init> to rewrite it");
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287 }
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288
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289 // rewrite methods, in two passes
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290 int i, len = _methods->length();
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291
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292 for (i = len; --i >= 0; ) {
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293 methodOop method = (methodOop)_methods->obj_at(i);
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294 scan_method(method);
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295 }
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296
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297 // allocate constant pool cache, now that we've seen all the bytecodes
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298 make_constant_pool_cache(CHECK);
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299
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300 for (i = len; --i >= 0; ) {
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301 methodHandle m(THREAD, (methodOop)_methods->obj_at(i));
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302
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303 if (m->has_jsrs()) {
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304 m = rewrite_jsrs(m, CHECK);
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305 // Method might have gotten rewritten.
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306 _methods->obj_at_put(i, m());
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307 }
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308
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309 // Set up method entry points for compiler and interpreter.
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310 m->link_method(m, CHECK);
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311 }
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312 }