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annotate src/share/vm/interpreter/rewriter.cpp @ 1972:f95d63e2154a

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6989984: Use standard include model for Hospot Summary: Replaced MakeDeps and the includeDB files with more standardized solutions. Reviewed-by: coleenp, kvn, kamg
author stefank
date Tue, 23 Nov 2010 13:22:55 -0800
parents 083fde3b838e
children dad31fc330cd
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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 "precompiled.hpp"
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26 #include "interpreter/bytecodes.hpp"
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27 #include "interpreter/interpreter.hpp"
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28 #include "interpreter/rewriter.hpp"
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29 #include "memory/gcLocker.hpp"
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30 #include "memory/oopFactory.hpp"
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31 #include "memory/resourceArea.hpp"
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32 #include "oops/generateOopMap.hpp"
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33 #include "oops/objArrayOop.hpp"
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34 #include "oops/oop.inline.hpp"
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35 #include "prims/methodComparator.hpp"
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36
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37 // Computes a CPC map (new_index -> original_index) for constant pool entries
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38 // that are referred to by the interpreter at runtime via the constant pool cache.
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39 // Also computes a CP map (original_index -> new_index).
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40 // Marks entries in CP which require additional processing.
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41 void Rewriter::compute_index_maps() {
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42 const int length = _pool->length();
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43 init_cp_map(length);
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44 jint tag_mask = 0;
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45 for (int i = 0; i < length; i++) {
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46 int tag = _pool->tag_at(i).value();
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47 tag_mask |= (1 << tag);
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48 switch (tag) {
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49 case JVM_CONSTANT_InterfaceMethodref:
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50 case JVM_CONSTANT_Fieldref : // fall through
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51 case JVM_CONSTANT_Methodref : // fall through
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52 case JVM_CONSTANT_MethodHandle : // fall through
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53 case JVM_CONSTANT_MethodType : // fall through
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54 case JVM_CONSTANT_InvokeDynamic : // fall through
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55 add_cp_cache_entry(i);
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56 break;
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57 }
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58 }
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59
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60 guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1),
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61 "all cp cache indexes fit in a u2");
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62
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63 _have_invoke_dynamic = ((tag_mask & (1 << JVM_CONSTANT_InvokeDynamic)) != 0);
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64 }
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65
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66
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67 // Creates a constant pool cache given a CPC map
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68 // This creates the constant pool cache initially in a state
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69 // that is unsafe for concurrent GC processing but sets it to
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70 // a safe mode before the constant pool cache is returned.
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71 void Rewriter::make_constant_pool_cache(TRAPS) {
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72 const int length = _cp_cache_map.length();
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73 constantPoolCacheOop cache =
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74 oopFactory::new_constantPoolCache(length, methodOopDesc::IsUnsafeConc, CHECK);
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75 cache->initialize(_cp_cache_map);
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76
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77 // Don't bother to the next pass if there is no JVM_CONSTANT_InvokeDynamic.
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78 if (_have_invoke_dynamic) {
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79 for (int i = 0; i < length; i++) {
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80 int pool_index = cp_cache_entry_pool_index(i);
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81 if (pool_index >= 0 &&
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82 _pool->tag_at(pool_index).is_invoke_dynamic()) {
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83 int bsm_index = _pool->invoke_dynamic_bootstrap_method_ref_index_at(pool_index);
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84 if (bsm_index != 0) {
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85 assert(_pool->tag_at(bsm_index).is_method_handle(), "must be a MH constant");
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86 // There is a CP cache entry holding the BSM for these calls.
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87 int bsm_cache_index = cp_entry_to_cp_cache(bsm_index);
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88 cache->entry_at(i)->initialize_bootstrap_method_index_in_cache(bsm_cache_index);
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89 } else {
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90 // There is no CP cache entry holding the BSM for these calls.
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91 // We will need to look for a class-global BSM, later.
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92 guarantee(AllowTransitionalJSR292, "");
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93 }
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94 }
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95 }
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96 }
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97
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98 _pool->set_cache(cache);
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99 cache->set_constant_pool(_pool());
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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 // The new finalization semantics says that registration of
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105 // finalizable objects must be performed on successful return from the
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106 // Object.<init> constructor. We could implement this trivially if
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107 // <init> were never rewritten but since JVMTI allows this to occur, a
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108 // more complicated solution is required. A special return bytecode
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109 // is used only by Object.<init> to signal the finalization
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110 // registration point. Additionally local 0 must be preserved so it's
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111 // available to pass to the registration function. For simplicty we
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112 // require that local 0 is never overwritten so it's available as an
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113 // argument for registration.
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114
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115 void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) {
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116 RawBytecodeStream bcs(method);
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117 while (!bcs.is_last_bytecode()) {
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118 Bytecodes::Code opcode = bcs.raw_next();
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119 switch (opcode) {
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120 case Bytecodes::_return: *bcs.bcp() = Bytecodes::_return_register_finalizer; break;
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121
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122 case Bytecodes::_istore:
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123 case Bytecodes::_lstore:
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124 case Bytecodes::_fstore:
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125 case Bytecodes::_dstore:
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126 case Bytecodes::_astore:
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127 if (bcs.get_index() != 0) continue;
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128
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129 // fall through
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130 case Bytecodes::_istore_0:
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131 case Bytecodes::_lstore_0:
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132 case Bytecodes::_fstore_0:
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133 case Bytecodes::_dstore_0:
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134 case Bytecodes::_astore_0:
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135 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(),
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136 "can't overwrite local 0 in Object.<init>");
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137 break;
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138 }
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139 }
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140 }
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141
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142
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143 // Rewrite a classfile-order CP index into a native-order CPC index.
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144 void Rewriter::rewrite_member_reference(address bcp, int offset) {
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145 address p = bcp + offset;
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146 int cp_index = Bytes::get_Java_u2(p);
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147 int cache_index = cp_entry_to_cp_cache(cp_index);
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148 Bytes::put_native_u2(p, cache_index);
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149 }
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150
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151
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152 void Rewriter::rewrite_invokedynamic(address bcp, int offset) {
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153 address p = bcp + offset;
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154 assert(p[-1] == Bytecodes::_invokedynamic, "");
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155 int cp_index = Bytes::get_Java_u2(p);
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156 int cpc = maybe_add_cp_cache_entry(cp_index); // add lazily
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157 int cpc2 = add_secondary_cp_cache_entry(cpc);
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158
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159 // Replace the trailing four bytes with a CPC index for the dynamic
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160 // call site. Unlike other CPC entries, there is one per bytecode,
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161 // not just one per distinct CP entry. In other words, the
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162 // CPC-to-CP relation is many-to-one for invokedynamic entries.
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163 // This means we must use a larger index size than u2 to address
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164 // all these entries. That is the main reason invokedynamic
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165 // must have a five-byte instruction format. (Of course, other JVM
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166 // implementations can use the bytes for other purposes.)
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167 Bytes::put_native_u4(p, constantPoolCacheOopDesc::encode_secondary_index(cpc2));
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168 // Note: We use native_u4 format exclusively for 4-byte indexes.
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169 }
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170
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171
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172 // Rewrite some ldc bytecodes to _fast_aldc
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173 void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide) {
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174 assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), "");
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175 address p = bcp + offset;
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176 int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p);
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177 constantTag tag = _pool->tag_at(cp_index).value();
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178 if (tag.is_method_handle() || tag.is_method_type()) {
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179 int cache_index = cp_entry_to_cp_cache(cp_index);
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180 if (is_wide) {
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181 (*bcp) = Bytecodes::_fast_aldc_w;
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182 assert(cache_index == (u2)cache_index, "");
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183 Bytes::put_native_u2(p, cache_index);
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184 } else {
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185 (*bcp) = Bytecodes::_fast_aldc;
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186 assert(cache_index == (u1)cache_index, "");
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187 (*p) = (u1)cache_index;
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188 }
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189 }
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190 }
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191
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192
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193 // Rewrites a method given the index_map information
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194 void Rewriter::scan_method(methodOop method) {
0
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195
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196 int nof_jsrs = 0;
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197 bool has_monitor_bytecodes = false;
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198
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199 {
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200 // We cannot tolerate a GC in this block, because we've
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201 // cached the bytecodes in 'code_base'. If the methodOop
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202 // moves, the bytecodes will also move.
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203 No_Safepoint_Verifier nsv;
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204 Bytecodes::Code c;
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205
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206 // Bytecodes and their length
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207 const address code_base = method->code_base();
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208 const int code_length = method->code_size();
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209
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210 int bc_length;
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211 for (int bci = 0; bci < code_length; bci += bc_length) {
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212 address bcp = code_base + bci;
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213 int prefix_length = 0;
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214 c = (Bytecodes::Code)(*bcp);
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215
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216 // Since we have the code, see if we can get the length
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217 // directly. Some more complicated bytecodes will report
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218 // a length of zero, meaning we need to make another method
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219 // call to calculate the length.
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220 bc_length = Bytecodes::length_for(c);
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221 if (bc_length == 0) {
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222 bc_length = Bytecodes::length_at(bcp);
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223
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224 // length_at will put us at the bytecode after the one modified
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225 // by 'wide'. We don't currently examine any of the bytecodes
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226 // modified by wide, but in case we do in the future...
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227 if (c == Bytecodes::_wide) {
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228 prefix_length = 1;
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229 c = (Bytecodes::Code)bcp[1];
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230 }
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231 }
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232
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233 assert(bc_length != 0, "impossible bytecode length");
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234
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235 switch (c) {
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236 case Bytecodes::_lookupswitch : {
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237 #ifndef CC_INTERP
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238 Bytecode_lookupswitch* bc = Bytecode_lookupswitch_at(bcp);
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239 (*bcp) = (
0
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240 bc->number_of_pairs() < BinarySwitchThreshold
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241 ? Bytecodes::_fast_linearswitch
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242 : Bytecodes::_fast_binaryswitch
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243 );
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244 #endif
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245 break;
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246 }
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247 case Bytecodes::_getstatic : // fall through
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248 case Bytecodes::_putstatic : // fall through
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249 case Bytecodes::_getfield : // fall through
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250 case Bytecodes::_putfield : // fall through
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251 case Bytecodes::_invokevirtual : // fall through
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252 case Bytecodes::_invokespecial : // fall through
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253 case Bytecodes::_invokestatic :
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254 case Bytecodes::_invokeinterface:
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255 rewrite_member_reference(bcp, prefix_length+1);
0
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256 break;
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257 case Bytecodes::_invokedynamic:
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258 rewrite_invokedynamic(bcp, prefix_length+1);
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259 break;
1602
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260 case Bytecodes::_ldc:
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261 maybe_rewrite_ldc(bcp, prefix_length+1, false);
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262 break;
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263 case Bytecodes::_ldc_w:
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264 maybe_rewrite_ldc(bcp, prefix_length+1, true);
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265 break;
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266 case Bytecodes::_jsr : // fall through
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267 case Bytecodes::_jsr_w : nof_jsrs++; break;
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268 case Bytecodes::_monitorenter : // fall through
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269 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break;
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270 }
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271 }
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272 }
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273
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274 // Update access flags
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275 if (has_monitor_bytecodes) {
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276 method->set_has_monitor_bytecodes();
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277 }
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278
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279 // The present of a jsr bytecode implies that the method might potentially
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280 // have to be rewritten, so we run the oopMapGenerator on the method
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281 if (nof_jsrs > 0) {
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282 method->set_has_jsrs();
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283 // Second pass will revisit this method.
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284 assert(method->has_jsrs(), "");
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285 }
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286 }
0
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287
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288 // After constant pool is created, revisit methods containing jsrs.
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289 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) {
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290 ResolveOopMapConflicts romc(method);
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291 methodHandle original_method = method;
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292 method = romc.do_potential_rewrite(CHECK_(methodHandle()));
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293 if (method() != original_method()) {
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294 // Insert invalid bytecode into original methodOop and set
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295 // interpreter entrypoint, so that a executing this method
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296 // will manifest itself in an easy recognizable form.
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297 address bcp = original_method->bcp_from(0);
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298 *bcp = (u1)Bytecodes::_shouldnotreachhere;
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299 int kind = Interpreter::method_kind(original_method);
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300 original_method->set_interpreter_kind(kind);
0
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301 }
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302
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303 // Update monitor matching info.
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304 if (romc.monitor_safe()) {
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305 method->set_guaranteed_monitor_matching();
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306 }
0
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307
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308 return method;
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309 }
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310
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311
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312 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) {
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313 ResourceMark rm(THREAD);
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314 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK);
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315 // (That's all, folks.)
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316 }
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317
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318
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319 void Rewriter::rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) {
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320 ResourceMark rm(THREAD);
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321 Rewriter rw(klass, cpool, methods, CHECK);
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322 // (That's all, folks.)
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323 }
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324
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325
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326 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS)
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327 : _klass(klass),
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328 _pool(cpool),
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329 _methods(methods)
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330 {
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331 assert(_pool->cache() == NULL, "constant pool cache must not be set yet");
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332
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333 // determine index maps for methodOop rewriting
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334 compute_index_maps();
0
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335
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336 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) {
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337 bool did_rewrite = false;
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338 int i = _methods->length();
0
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339 while (i-- > 0) {
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340 methodOop method = (methodOop)_methods->obj_at(i);
0
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341 if (method->intrinsic_id() == vmIntrinsics::_Object_init) {
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342 // rewrite the return bytecodes of Object.<init> to register the
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343 // object for finalization if needed.
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344 methodHandle m(THREAD, method);
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345 rewrite_Object_init(m, CHECK);
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346 did_rewrite = true;
0
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347 break;
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348 }
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349 }
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350 assert(did_rewrite, "must find Object::<init> to rewrite it");
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351 }
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352
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353 // rewrite methods, in two passes
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diff changeset
354 int i, len = _methods->length();
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355
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356 for (i = len; --i >= 0; ) {
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357 methodOop method = (methodOop)_methods->obj_at(i);
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diff changeset
358 scan_method(method);
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diff changeset
359 }
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diff changeset
360
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diff changeset
361 // allocate constant pool cache, now that we've seen all the bytecodes
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362 make_constant_pool_cache(CHECK);
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diff changeset
363
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364 for (i = len; --i >= 0; ) {
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365 methodHandle m(THREAD, (methodOop)_methods->obj_at(i));
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366
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diff changeset
367 if (m->has_jsrs()) {
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368 m = rewrite_jsrs(m, CHECK);
0
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369 // Method might have gotten rewritten.
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370 _methods->obj_at_put(i, m());
0
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371 }
726
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372
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373 // Set up method entry points for compiler and interpreter.
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374 m->link_method(m, CHECK);
1574
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375
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376 #ifdef ASSERT
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377 if (StressMethodComparator) {
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378 static int nmc = 0;
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379 for (int j = i; j >= 0 && j >= i-4; j--) {
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380 if ((++nmc % 1000) == 0) tty->print_cr("Have run MethodComparator %d times...", nmc);
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381 bool z = MethodComparator::methods_EMCP(m(), (methodOop)_methods->obj_at(j));
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382 if (j == i && !z) {
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383 tty->print("MethodComparator FAIL: "); m->print(); m->print_codes();
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384 assert(z, "method must compare equal to itself");
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385 }
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386 }
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387 }
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388 #endif //ASSERT
0
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389 }
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390 }