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annotate src/share/vm/interpreter/rewriter.cpp @ 1930:2d26b0046e0d

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Merge.
author Thomas Wuerthinger <wuerthinger@ssw.jku.at>
date Tue, 30 Nov 2010 14:53:30 +0100
parents efba53f86c4f 083fde3b838e
children 06f017f7daa7
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1 /*
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2 * Copyright (c) 1998, 2010, 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 jint tag_mask = 0;
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36 for (int i = 0; i < length; i++) {
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37 int tag = _pool->tag_at(i).value();
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38 tag_mask |= (1 << tag);
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39 switch (tag) {
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40 case JVM_CONSTANT_InterfaceMethodref:
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41 case JVM_CONSTANT_Fieldref : // fall through
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42 case JVM_CONSTANT_Methodref : // fall through
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43 case JVM_CONSTANT_MethodHandle : // fall through
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44 case JVM_CONSTANT_MethodType : // fall through
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45 case JVM_CONSTANT_InvokeDynamic : // fall through
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46 add_cp_cache_entry(i);
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47 break;
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48 }
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49 }
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50
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51 guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1),
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52 "all cp cache indexes fit in a u2");
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53
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54 _have_invoke_dynamic = ((tag_mask & (1 << JVM_CONSTANT_InvokeDynamic)) != 0);
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55 }
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56
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57
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58 // Creates a constant pool cache given a CPC map
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59 // This creates the constant pool cache initially in a state
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60 // that is unsafe for concurrent GC processing but sets it to
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61 // a safe mode before the constant pool cache is returned.
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62 void Rewriter::make_constant_pool_cache(TRAPS) {
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63 const int length = _cp_cache_map.length();
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64 constantPoolCacheOop cache =
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65 oopFactory::new_constantPoolCache(length, methodOopDesc::IsUnsafeConc, CHECK);
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66 cache->initialize(_cp_cache_map);
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67
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68 // Don't bother to the next pass if there is no JVM_CONSTANT_InvokeDynamic.
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69 if (_have_invoke_dynamic) {
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70 for (int i = 0; i < length; i++) {
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71 int pool_index = cp_cache_entry_pool_index(i);
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72 if (pool_index >= 0 &&
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73 _pool->tag_at(pool_index).is_invoke_dynamic()) {
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74 int bsm_index = _pool->invoke_dynamic_bootstrap_method_ref_index_at(pool_index);
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75 if (bsm_index != 0) {
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76 assert(_pool->tag_at(bsm_index).is_method_handle(), "must be a MH constant");
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77 // There is a CP cache entry holding the BSM for these calls.
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78 int bsm_cache_index = cp_entry_to_cp_cache(bsm_index);
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79 cache->entry_at(i)->initialize_bootstrap_method_index_in_cache(bsm_cache_index);
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80 } else {
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81 // There is no CP cache entry holding the BSM for these calls.
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82 // We will need to look for a class-global BSM, later.
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83 guarantee(AllowTransitionalJSR292, "");
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84 }
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85 }
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86 }
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87 }
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88
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89 _pool->set_cache(cache);
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90 cache->set_constant_pool(_pool());
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91 }
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92
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93
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94
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95 // The new finalization semantics says that registration of
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96 // finalizable objects must be performed on successful return from the
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97 // Object.<init> constructor. We could implement this trivially if
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98 // <init> were never rewritten but since JVMTI allows this to occur, a
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99 // more complicated solution is required. A special return bytecode
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100 // is used only by Object.<init> to signal the finalization
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101 // registration point. Additionally local 0 must be preserved so it's
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102 // available to pass to the registration function. For simplicty we
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103 // require that local 0 is never overwritten so it's available as an
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104 // argument for registration.
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105
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106 void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) {
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107 RawBytecodeStream bcs(method);
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108 while (!bcs.is_last_bytecode()) {
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109 Bytecodes::Code opcode = bcs.raw_next();
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110 switch (opcode) {
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111 case Bytecodes::_return: if (!UseC1X) { *bcs.bcp() = Bytecodes::_return_register_finalizer; } break;
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112
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113 case Bytecodes::_istore:
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114 case Bytecodes::_lstore:
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115 case Bytecodes::_fstore:
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116 case Bytecodes::_dstore:
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117 case Bytecodes::_astore:
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118 if (bcs.get_index() != 0) continue;
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119
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120 // fall through
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121 case Bytecodes::_istore_0:
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122 case Bytecodes::_lstore_0:
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123 case Bytecodes::_fstore_0:
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124 case Bytecodes::_dstore_0:
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125 case Bytecodes::_astore_0:
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126 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
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127 "can't overwrite local 0 in Object.<init>");
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128 break;
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129 }
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130 }
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131 }
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132
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133
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134 // Rewrite a classfile-order CP index into a native-order CPC index.
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135 void Rewriter::rewrite_member_reference(address bcp, int offset) {
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136 address p = bcp + offset;
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137 int cp_index = Bytes::get_Java_u2(p);
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138 int cache_index = cp_entry_to_cp_cache(cp_index);
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139 Bytes::put_native_u2(p, cache_index);
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140 }
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141
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142
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143 void Rewriter::rewrite_invokedynamic(address bcp, int offset) {
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144 address p = bcp + offset;
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145 assert(p[-1] == Bytecodes::_invokedynamic, "");
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146 int cp_index = Bytes::get_Java_u2(p);
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147 int cpc = maybe_add_cp_cache_entry(cp_index); // add lazily
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148 int cpc2 = add_secondary_cp_cache_entry(cpc);
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149
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150 // Replace the trailing four bytes with a CPC index for the dynamic
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151 // call site. Unlike other CPC entries, there is one per bytecode,
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152 // not just one per distinct CP entry. In other words, the
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153 // CPC-to-CP relation is many-to-one for invokedynamic entries.
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154 // This means we must use a larger index size than u2 to address
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155 // all these entries. That is the main reason invokedynamic
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156 // must have a five-byte instruction format. (Of course, other JVM
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157 // implementations can use the bytes for other purposes.)
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158 Bytes::put_native_u4(p, constantPoolCacheOopDesc::encode_secondary_index(cpc2));
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159 // Note: We use native_u4 format exclusively for 4-byte indexes.
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160 }
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161
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162
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163 // Rewrite some ldc bytecodes to _fast_aldc
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164 void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide) {
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165 assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), "");
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166 address p = bcp + offset;
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167 int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p);
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168 constantTag tag = _pool->tag_at(cp_index).value();
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169 if (tag.is_method_handle() || tag.is_method_type()) {
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170 int cache_index = cp_entry_to_cp_cache(cp_index);
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171 if (is_wide) {
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172 (*bcp) = Bytecodes::_fast_aldc_w;
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173 assert(cache_index == (u2)cache_index, "");
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174 Bytes::put_native_u2(p, cache_index);
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175 } else {
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176 (*bcp) = Bytecodes::_fast_aldc;
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177 assert(cache_index == (u1)cache_index, "");
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178 (*p) = (u1)cache_index;
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179 }
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180 }
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181 }
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182
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183
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184 // Rewrites a method given the index_map information
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185 void Rewriter::scan_method(methodOop method) {
0
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186
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187 int nof_jsrs = 0;
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188 bool has_monitor_bytecodes = false;
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189
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190 {
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191 // We cannot tolerate a GC in this block, because we've
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192 // cached the bytecodes in 'code_base'. If the methodOop
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193 // moves, the bytecodes will also move.
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194 No_Safepoint_Verifier nsv;
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195 Bytecodes::Code c;
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196
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197 // Bytecodes and their length
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198 const address code_base = method->code_base();
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199 const int code_length = method->code_size();
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200
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201 int bc_length;
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202 for (int bci = 0; bci < code_length; bci += bc_length) {
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203 address bcp = code_base + bci;
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204 int prefix_length = 0;
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205 c = (Bytecodes::Code)(*bcp);
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206
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207 // Since we have the code, see if we can get the length
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208 // directly. Some more complicated bytecodes will report
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209 // a length of zero, meaning we need to make another method
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210 // call to calculate the length.
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211 bc_length = Bytecodes::length_for(c);
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212 if (bc_length == 0) {
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213 bc_length = Bytecodes::length_at(bcp);
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214
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215 // length_at will put us at the bytecode after the one modified
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216 // by 'wide'. We don't currently examine any of the bytecodes
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217 // modified by wide, but in case we do in the future...
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218 if (c == Bytecodes::_wide) {
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219 prefix_length = 1;
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220 c = (Bytecodes::Code)bcp[1];
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221 }
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222 }
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223
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224 assert(bc_length != 0, "impossible bytecode length");
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225
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226 switch (c) {
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227 case Bytecodes::_lookupswitch : {
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228 #ifndef CC_INTERP
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229 if (!UseC1X) {
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230 Bytecode_lookupswitch* bc = Bytecode_lookupswitch_at(bcp);
1930
Thomas Wuerthinger <wuerthinger@ssw.jku.at>
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231 (*bcp) = (
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232 bc->number_of_pairs() < BinarySwitchThreshold
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233 ? Bytecodes::_fast_linearswitch
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234 : Bytecodes::_fast_binaryswitch
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235 );
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236 }
0
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237 #endif
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238 break;
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239 }
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240 case Bytecodes::_getstatic : // fall through
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241 case Bytecodes::_putstatic : // fall through
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242 case Bytecodes::_getfield : // fall through
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243 case Bytecodes::_putfield : // fall through
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244 case Bytecodes::_invokevirtual : // fall through
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245 case Bytecodes::_invokespecial : // fall through
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246 case Bytecodes::_invokestatic :
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247 case Bytecodes::_invokeinterface:
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248 rewrite_member_reference(bcp, prefix_length+1);
0
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249 break;
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250 case Bytecodes::_invokedynamic:
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251 rewrite_invokedynamic(bcp, prefix_length+1);
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252 break;
1602
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253 case Bytecodes::_ldc:
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254 maybe_rewrite_ldc(bcp, prefix_length+1, false);
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255 break;
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256 case Bytecodes::_ldc_w:
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257 maybe_rewrite_ldc(bcp, prefix_length+1, true);
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258 break;
0
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259 case Bytecodes::_jsr : // fall through
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260 case Bytecodes::_jsr_w : nof_jsrs++; break;
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261 case Bytecodes::_monitorenter : // fall through
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262 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break;
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263 }
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264 }
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265 }
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266
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267 // Update access flags
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268 if (has_monitor_bytecodes) {
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269 method->set_has_monitor_bytecodes();
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270 }
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271
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272 // The present of a jsr bytecode implies that the method might potentially
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273 // have to be rewritten, so we run the oopMapGenerator on the method
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274 if (nof_jsrs > 0) {
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275 method->set_has_jsrs();
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276 // Second pass will revisit this method.
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277 assert(method->has_jsrs(), "");
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278 }
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279 }
0
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280
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281 // After constant pool is created, revisit methods containing jsrs.
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282 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) {
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283 ResolveOopMapConflicts romc(method);
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diff changeset
284 methodHandle original_method = method;
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diff changeset
285 method = romc.do_potential_rewrite(CHECK_(methodHandle()));
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diff changeset
286 if (method() != original_method()) {
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diff changeset
287 // Insert invalid bytecode into original methodOop and set
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diff changeset
288 // interpreter entrypoint, so that a executing this method
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diff changeset
289 // will manifest itself in an easy recognizable form.
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diff changeset
290 address bcp = original_method->bcp_from(0);
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diff changeset
291 *bcp = (u1)Bytecodes::_shouldnotreachhere;
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diff changeset
292 int kind = Interpreter::method_kind(original_method);
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diff changeset
293 original_method->set_interpreter_kind(kind);
0
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294 }
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295
726
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diff changeset
296 // Update monitor matching info.
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diff changeset
297 if (romc.monitor_safe()) {
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diff changeset
298 method->set_guaranteed_monitor_matching();
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diff changeset
299 }
0
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300
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301 return method;
a61af66fc99e Initial load
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302 }
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303
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304
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305 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) {
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diff changeset
306 ResourceMark rm(THREAD);
1138
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diff changeset
307 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK);
726
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diff changeset
308 // (That's all, folks.)
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309 }
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diff changeset
310
1138
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parents: 1059
diff changeset
311
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312 void Rewriter::rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) {
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2
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diff changeset
313 ResourceMark rm(THREAD);
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2
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314 Rewriter rw(klass, cpool, methods, CHECK);
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diff changeset
315 // (That's all, folks.)
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diff changeset
316 }
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diff changeset
317
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2
twisti
parents: 1059
diff changeset
318
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diff changeset
319 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS)
726
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diff changeset
320 : _klass(klass),
1138
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parents: 1059
diff changeset
321 _pool(cpool),
dd57230ba8fe 6893268: additional dynamic language related optimizations in C2
twisti
parents: 1059
diff changeset
322 _methods(methods)
726
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diff changeset
323 {
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diff changeset
324 assert(_pool->cache() == NULL, "constant pool cache must not be set yet");
0
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325
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diff changeset
326 // determine index maps for methodOop rewriting
726
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diff changeset
327 compute_index_maps();
0
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diff changeset
328
726
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diff changeset
329 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) {
856
75596850f863 6862576: vmIntrinsics needs cleanup in order to support JSR 292 intrinsics
jrose
parents: 726
diff changeset
330 bool did_rewrite = false;
726
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diff changeset
331 int i = _methods->length();
0
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332 while (i-- > 0) {
726
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diff changeset
333 methodOop method = (methodOop)_methods->obj_at(i);
0
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parents:
diff changeset
334 if (method->intrinsic_id() == vmIntrinsics::_Object_init) {
a61af66fc99e Initial load
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parents:
diff changeset
335 // rewrite the return bytecodes of Object.<init> to register the
a61af66fc99e Initial load
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parents:
diff changeset
336 // object for finalization if needed.
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diff changeset
337 methodHandle m(THREAD, method);
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338 rewrite_Object_init(m, CHECK);
856
75596850f863 6862576: vmIntrinsics needs cleanup in order to support JSR 292 intrinsics
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diff changeset
339 did_rewrite = true;
0
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340 break;
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diff changeset
341 }
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diff changeset
342 }
856
75596850f863 6862576: vmIntrinsics needs cleanup in order to support JSR 292 intrinsics
jrose
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diff changeset
343 assert(did_rewrite, "must find Object::<init> to rewrite it");
0
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parents:
diff changeset
344 }
a61af66fc99e Initial load
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diff changeset
345
726
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diff changeset
346 // rewrite methods, in two passes
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diff changeset
347 int i, len = _methods->length();
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diff changeset
348
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diff changeset
349 for (i = len; --i >= 0; ) {
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diff changeset
350 methodOop method = (methodOop)_methods->obj_at(i);
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diff changeset
351 scan_method(method);
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parents: 579
diff changeset
352 }
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parents: 579
diff changeset
353
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diff changeset
354 // allocate constant pool cache, now that we've seen all the bytecodes
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diff changeset
355 make_constant_pool_cache(CHECK);
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parents: 579
diff changeset
356
be93aad57795 6655646: dynamic languages need dynamically linked call sites
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diff changeset
357 for (i = len; --i >= 0; ) {
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diff changeset
358 methodHandle m(THREAD, (methodOop)_methods->obj_at(i));
be93aad57795 6655646: dynamic languages need dynamically linked call sites
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parents: 579
diff changeset
359
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diff changeset
360 if (m->has_jsrs()) {
be93aad57795 6655646: dynamic languages need dynamically linked call sites
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diff changeset
361 m = rewrite_jsrs(m, CHECK);
0
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parents:
diff changeset
362 // Method might have gotten rewritten.
726
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diff changeset
363 _methods->obj_at_put(i, m());
0
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parents:
diff changeset
364 }
726
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diff changeset
365
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diff changeset
366 // Set up method entry points for compiler and interpreter.
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diff changeset
367 m->link_method(m, CHECK);
1574
1eb493f33423 6957080: MethodComparator needs stress testing
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diff changeset
368
1eb493f33423 6957080: MethodComparator needs stress testing
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diff changeset
369 #ifdef ASSERT
1eb493f33423 6957080: MethodComparator needs stress testing
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diff changeset
370 if (StressMethodComparator) {
1eb493f33423 6957080: MethodComparator needs stress testing
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371 static int nmc = 0;
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372 for (int j = i; j >= 0 && j >= i-4; j--) {
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373 if ((++nmc % 1000) == 0) tty->print_cr("Have run MethodComparator %d times...", nmc);
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374 bool z = MethodComparator::methods_EMCP(m(), (methodOop)_methods->obj_at(j));
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375 if (j == i && !z) {
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376 tty->print("MethodComparator FAIL: "); m->print(); m->print_codes();
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377 assert(z, "method must compare equal to itself");
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378 }
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379 }
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380 }
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381 #endif //ASSERT
0
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382 }
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383 }