Mercurial > hg > graal-compiler
annotate src/share/vm/interpreter/rewriter.cpp @ 8124:5fc51c1ecdeb
Merge.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Tue, 05 Mar 2013 23:44:54 +0100 |
parents | 989155e2d07a f16e75e0cf11 |
children | b8f261ba79c6 |
rev | line source |
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0 | 1 /* |
8104 | 2 * Copyright (c) 1998, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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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. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "interpreter/bytecodes.hpp" | |
27 #include "interpreter/interpreter.hpp" | |
28 #include "interpreter/rewriter.hpp" | |
29 #include "memory/gcLocker.hpp" | |
30 #include "memory/resourceArea.hpp" | |
31 #include "oops/generateOopMap.hpp" | |
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32 #include "prims/methodHandles.hpp" |
0 | 33 |
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34 // Computes a CPC map (new_index -> original_index) for constant pool entries |
0 | 35 // that are referred to by the interpreter at runtime via the constant pool cache. |
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36 // Also computes a CP map (original_index -> new_index). |
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37 // Marks entries in CP which require additional processing. |
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38 void Rewriter::compute_index_maps() { |
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39 const int length = _pool->length(); |
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40 init_maps(length); |
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41 bool saw_mh_symbol = false; |
0 | 42 for (int i = 0; i < length; i++) { |
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43 int tag = _pool->tag_at(i).value(); |
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44 switch (tag) { |
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45 case JVM_CONSTANT_InterfaceMethodref: |
0 | 46 case JVM_CONSTANT_Fieldref : // fall through |
47 case JVM_CONSTANT_Methodref : // fall through | |
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48 add_cp_cache_entry(i); |
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49 break; |
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50 case JVM_CONSTANT_String: |
1602 | 51 case JVM_CONSTANT_MethodHandle : // fall through |
52 case JVM_CONSTANT_MethodType : // fall through | |
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53 add_resolved_references_entry(i); |
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54 break; |
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55 case JVM_CONSTANT_Utf8: |
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56 if (_pool->symbol_at(i) == vmSymbols::java_lang_invoke_MethodHandle()) |
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57 saw_mh_symbol = true; |
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58 break; |
0 | 59 } |
60 } | |
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61 |
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62 // Record limits of resolved reference map for constant pool cache indices |
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63 record_map_limits(); |
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64 |
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65 guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1), |
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66 "all cp cache indexes fit in a u2"); |
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67 |
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68 if (saw_mh_symbol) |
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69 _method_handle_invokers.initialize(length, (int)0); |
0 | 70 } |
71 | |
3404 | 72 // Unrewrite the bytecodes if an error occurs. |
73 void Rewriter::restore_bytecodes() { | |
74 int len = _methods->length(); | |
75 | |
76 for (int i = len-1; i >= 0; i--) { | |
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77 Method* method = _methods->at(i); |
3404 | 78 scan_method(method, true); |
79 } | |
80 } | |
0 | 81 |
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82 // Creates a constant pool cache given a CPC map |
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83 void Rewriter::make_constant_pool_cache(TRAPS) { |
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84 const int length = _cp_cache_map.length(); |
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85 ClassLoaderData* loader_data = _pool->pool_holder()->class_loader_data(); |
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86 ConstantPoolCache* cache = |
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87 ConstantPoolCache::allocate(loader_data, length, CHECK); |
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88 |
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89 // initialize object cache in constant pool |
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90 _pool->initialize_resolved_references(loader_data, _resolved_references_map, |
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91 _resolved_reference_limit, |
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92 CHECK); |
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93 |
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94 No_Safepoint_Verifier nsv; |
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95 cache->initialize(_cp_cache_map, _invokedynamic_references_map); |
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96 _pool->set_cache(cache); |
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97 cache->set_constant_pool(_pool()); |
0 | 98 } |
99 | |
100 | |
101 | |
102 // The new finalization semantics says that registration of | |
103 // finalizable objects must be performed on successful return from the | |
104 // Object.<init> constructor. We could implement this trivially if | |
105 // <init> were never rewritten but since JVMTI allows this to occur, a | |
106 // more complicated solution is required. A special return bytecode | |
107 // is used only by Object.<init> to signal the finalization | |
108 // registration point. Additionally local 0 must be preserved so it's | |
109 // available to pass to the registration function. For simplicty we | |
110 // require that local 0 is never overwritten so it's available as an | |
111 // argument for registration. | |
112 | |
113 void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) { | |
114 RawBytecodeStream bcs(method); | |
115 while (!bcs.is_last_bytecode()) { | |
116 Bytecodes::Code opcode = bcs.raw_next(); | |
117 switch (opcode) { | |
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118 case Bytecodes::_return: |
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119 *bcs.bcp() = Bytecodes::_return_register_finalizer; |
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120 break; |
0 | 121 |
122 case Bytecodes::_istore: | |
123 case Bytecodes::_lstore: | |
124 case Bytecodes::_fstore: | |
125 case Bytecodes::_dstore: | |
126 case Bytecodes::_astore: | |
127 if (bcs.get_index() != 0) continue; | |
128 | |
129 // fall through | |
130 case Bytecodes::_istore_0: | |
131 case Bytecodes::_lstore_0: | |
132 case Bytecodes::_fstore_0: | |
133 case Bytecodes::_dstore_0: | |
134 case Bytecodes::_astore_0: | |
135 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), | |
136 "can't overwrite local 0 in Object.<init>"); | |
137 break; | |
138 } | |
139 } | |
140 } | |
141 | |
142 | |
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143 // Rewrite a classfile-order CP index into a native-order CPC index. |
3404 | 144 void Rewriter::rewrite_member_reference(address bcp, int offset, bool reverse) { |
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145 address p = bcp + offset; |
3404 | 146 if (!reverse) { |
147 int cp_index = Bytes::get_Java_u2(p); | |
148 int cache_index = cp_entry_to_cp_cache(cp_index); | |
149 Bytes::put_native_u2(p, cache_index); | |
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150 if (!_method_handle_invokers.is_empty()) |
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151 maybe_rewrite_invokehandle(p - 1, cp_index, cache_index, reverse); |
3404 | 152 } else { |
153 int cache_index = Bytes::get_native_u2(p); | |
154 int pool_index = cp_cache_entry_pool_index(cache_index); | |
155 Bytes::put_Java_u2(p, pool_index); | |
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156 if (!_method_handle_invokers.is_empty()) |
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157 maybe_rewrite_invokehandle(p - 1, pool_index, cache_index, reverse); |
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158 } |
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159 } |
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160 |
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161 |
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162 // Adjust the invocation bytecode for a signature-polymorphic method (MethodHandle.invoke, etc.) |
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163 void Rewriter::maybe_rewrite_invokehandle(address opc, int cp_index, int cache_index, bool reverse) { |
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164 if (!reverse) { |
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165 if ((*opc) == (u1)Bytecodes::_invokevirtual || |
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166 // allow invokespecial as an alias, although it would be very odd: |
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167 (*opc) == (u1)Bytecodes::_invokespecial) { |
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168 assert(_pool->tag_at(cp_index).is_method(), "wrong index"); |
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169 // Determine whether this is a signature-polymorphic method. |
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170 if (cp_index >= _method_handle_invokers.length()) return; |
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171 int status = _method_handle_invokers[cp_index]; |
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172 assert(status >= -1 && status <= 1, "oob tri-state"); |
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173 if (status == 0) { |
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174 if (_pool->klass_ref_at_noresolve(cp_index) == vmSymbols::java_lang_invoke_MethodHandle() && |
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175 MethodHandles::is_signature_polymorphic_name(SystemDictionary::MethodHandle_klass(), |
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176 _pool->name_ref_at(cp_index))) { |
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177 // we may need a resolved_refs entry for the appendix |
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178 add_invokedynamic_resolved_references_entries(cp_index, cache_index); |
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179 status = +1; |
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180 } else { |
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181 status = -1; |
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182 } |
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183 _method_handle_invokers[cp_index] = status; |
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184 } |
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185 // We use a special internal bytecode for such methods (if non-static). |
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186 // The basic reason for this is that such methods need an extra "appendix" argument |
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187 // to transmit the call site's intended call type. |
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188 if (status > 0) { |
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189 (*opc) = (u1)Bytecodes::_invokehandle; |
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190 } |
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191 } |
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192 } else { |
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193 // Do not need to look at cp_index. |
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194 if ((*opc) == (u1)Bytecodes::_invokehandle) { |
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195 (*opc) = (u1)Bytecodes::_invokevirtual; |
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196 // Ignore corner case of original _invokespecial instruction. |
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197 // This is safe because (a) the signature polymorphic method was final, and |
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198 // (b) the implementation of MethodHandle will not call invokespecial on it. |
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199 } |
3404 | 200 } |
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201 } |
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202 |
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203 |
3404 | 204 void Rewriter::rewrite_invokedynamic(address bcp, int offset, bool reverse) { |
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205 address p = bcp + offset; |
3404 | 206 assert(p[-1] == Bytecodes::_invokedynamic, "not invokedynamic bytecode"); |
207 if (!reverse) { | |
208 int cp_index = Bytes::get_Java_u2(p); | |
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209 int cache_index = add_invokedynamic_cp_cache_entry(cp_index); |
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210 add_invokedynamic_resolved_references_entries(cp_index, cache_index); |
3404 | 211 // Replace the trailing four bytes with a CPC index for the dynamic |
212 // call site. Unlike other CPC entries, there is one per bytecode, | |
213 // not just one per distinct CP entry. In other words, the | |
214 // CPC-to-CP relation is many-to-one for invokedynamic entries. | |
215 // This means we must use a larger index size than u2 to address | |
216 // all these entries. That is the main reason invokedynamic | |
217 // must have a five-byte instruction format. (Of course, other JVM | |
218 // implementations can use the bytes for other purposes.) | |
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219 Bytes::put_native_u4(p, ConstantPool::encode_invokedynamic_index(cache_index)); |
3404 | 220 // Note: We use native_u4 format exclusively for 4-byte indexes. |
221 } else { | |
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222 // callsite index |
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223 int cache_index = ConstantPool::decode_invokedynamic_index( |
3404 | 224 Bytes::get_native_u4(p)); |
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225 int cp_index = cp_cache_entry_pool_index(cache_index); |
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226 assert(_pool->tag_at(cp_index).is_invoke_dynamic(), "wrong index"); |
3404 | 227 // zero out 4 bytes |
228 Bytes::put_Java_u4(p, 0); | |
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229 Bytes::put_Java_u2(p, cp_index); |
3404 | 230 } |
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231 } |
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232 |
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233 |
1602 | 234 // Rewrite some ldc bytecodes to _fast_aldc |
3404 | 235 void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide, |
236 bool reverse) { | |
237 if (!reverse) { | |
238 assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), "not ldc bytecode"); | |
239 address p = bcp + offset; | |
240 int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p); | |
241 constantTag tag = _pool->tag_at(cp_index).value(); | |
8104 | 242 if (tag.is_method_handle() || tag.is_method_type() || tag.is_string()) { |
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243 int ref_index = cp_entry_to_resolved_references(cp_index); |
3404 | 244 if (is_wide) { |
245 (*bcp) = Bytecodes::_fast_aldc_w; | |
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246 assert(ref_index == (u2)ref_index, "index overflow"); |
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247 Bytes::put_native_u2(p, ref_index); |
3404 | 248 } else { |
249 (*bcp) = Bytecodes::_fast_aldc; | |
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250 assert(ref_index == (u1)ref_index, "index overflow"); |
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251 (*p) = (u1)ref_index; |
3404 | 252 } |
253 } | |
254 } else { | |
255 Bytecodes::Code rewritten_bc = | |
256 (is_wide ? Bytecodes::_fast_aldc_w : Bytecodes::_fast_aldc); | |
257 if ((*bcp) == rewritten_bc) { | |
258 address p = bcp + offset; | |
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259 int ref_index = is_wide ? Bytes::get_native_u2(p) : (u1)(*p); |
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260 int pool_index = resolved_references_entry_to_pool_index(ref_index); |
3404 | 261 if (is_wide) { |
262 (*bcp) = Bytecodes::_ldc_w; | |
263 assert(pool_index == (u2)pool_index, "index overflow"); | |
264 Bytes::put_Java_u2(p, pool_index); | |
265 } else { | |
266 (*bcp) = Bytecodes::_ldc; | |
267 assert(pool_index == (u1)pool_index, "index overflow"); | |
268 (*p) = (u1)pool_index; | |
269 } | |
1602 | 270 } |
271 } | |
272 } | |
273 | |
274 | |
0 | 275 // Rewrites a method given the index_map information |
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276 void Rewriter::scan_method(Method* method, bool reverse) { |
0 | 277 |
278 int nof_jsrs = 0; | |
279 bool has_monitor_bytecodes = false; | |
280 | |
281 { | |
282 // We cannot tolerate a GC in this block, because we've | |
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283 // cached the bytecodes in 'code_base'. If the Method* |
0 | 284 // moves, the bytecodes will also move. |
285 No_Safepoint_Verifier nsv; | |
286 Bytecodes::Code c; | |
287 | |
288 // Bytecodes and their length | |
289 const address code_base = method->code_base(); | |
290 const int code_length = method->code_size(); | |
291 | |
292 int bc_length; | |
293 for (int bci = 0; bci < code_length; bci += bc_length) { | |
294 address bcp = code_base + bci; | |
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295 int prefix_length = 0; |
0 | 296 c = (Bytecodes::Code)(*bcp); |
297 | |
298 // Since we have the code, see if we can get the length | |
299 // directly. Some more complicated bytecodes will report | |
300 // a length of zero, meaning we need to make another method | |
301 // call to calculate the length. | |
302 bc_length = Bytecodes::length_for(c); | |
303 if (bc_length == 0) { | |
2142 | 304 bc_length = Bytecodes::length_at(method, bcp); |
0 | 305 |
306 // length_at will put us at the bytecode after the one modified | |
307 // by 'wide'. We don't currently examine any of the bytecodes | |
308 // modified by wide, but in case we do in the future... | |
309 if (c == Bytecodes::_wide) { | |
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310 prefix_length = 1; |
0 | 311 c = (Bytecodes::Code)bcp[1]; |
312 } | |
313 } | |
314 | |
315 assert(bc_length != 0, "impossible bytecode length"); | |
316 | |
317 switch (c) { | |
318 case Bytecodes::_lookupswitch : { | |
319 #ifndef CC_INTERP | |
2181 | 320 Bytecode_lookupswitch bc(method, bcp); |
1930 | 321 (*bcp) = ( |
2181 | 322 bc.number_of_pairs() < BinarySwitchThreshold |
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323 ? Bytecodes::_fast_linearswitch |
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324 : Bytecodes::_fast_binaryswitch |
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325 ); |
0 | 326 #endif |
327 break; | |
328 } | |
3404 | 329 case Bytecodes::_fast_linearswitch: |
330 case Bytecodes::_fast_binaryswitch: { | |
331 #ifndef CC_INTERP | |
332 (*bcp) = Bytecodes::_lookupswitch; | |
333 #endif | |
334 break; | |
335 } | |
0 | 336 case Bytecodes::_getstatic : // fall through |
337 case Bytecodes::_putstatic : // fall through | |
338 case Bytecodes::_getfield : // fall through | |
339 case Bytecodes::_putfield : // fall through | |
340 case Bytecodes::_invokevirtual : // fall through | |
341 case Bytecodes::_invokespecial : // fall through | |
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342 case Bytecodes::_invokestatic : |
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343 case Bytecodes::_invokeinterface: |
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344 case Bytecodes::_invokehandle : // if reverse=true |
3404 | 345 rewrite_member_reference(bcp, prefix_length+1, reverse); |
0 | 346 break; |
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347 case Bytecodes::_invokedynamic: |
3404 | 348 rewrite_invokedynamic(bcp, prefix_length+1, reverse); |
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349 break; |
1602 | 350 case Bytecodes::_ldc: |
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351 case Bytecodes::_fast_aldc: // if reverse=true |
3404 | 352 maybe_rewrite_ldc(bcp, prefix_length+1, false, reverse); |
1602 | 353 break; |
354 case Bytecodes::_ldc_w: | |
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355 case Bytecodes::_fast_aldc_w: // if reverse=true |
3404 | 356 maybe_rewrite_ldc(bcp, prefix_length+1, true, reverse); |
1602 | 357 break; |
0 | 358 case Bytecodes::_jsr : // fall through |
359 case Bytecodes::_jsr_w : nof_jsrs++; break; | |
360 case Bytecodes::_monitorenter : // fall through | |
361 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break; | |
362 } | |
363 } | |
364 } | |
365 | |
366 // Update access flags | |
367 if (has_monitor_bytecodes) { | |
368 method->set_has_monitor_bytecodes(); | |
369 } | |
370 | |
371 // The present of a jsr bytecode implies that the method might potentially | |
372 // have to be rewritten, so we run the oopMapGenerator on the method | |
373 if (nof_jsrs > 0) { | |
374 method->set_has_jsrs(); | |
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375 // Second pass will revisit this method. |
3404 | 376 assert(method->has_jsrs(), "didn't we just set this?"); |
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377 } |
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378 } |
0 | 379 |
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380 // After constant pool is created, revisit methods containing jsrs. |
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381 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) { |
3404 | 382 ResourceMark rm(THREAD); |
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383 ResolveOopMapConflicts romc(method); |
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384 methodHandle original_method = method; |
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385 method = romc.do_potential_rewrite(CHECK_(methodHandle())); |
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386 // Update monitor matching info. |
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387 if (romc.monitor_safe()) { |
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388 method->set_guaranteed_monitor_matching(); |
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389 } |
0 | 390 |
391 return method; | |
392 } | |
393 | |
394 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) { | |
395 ResourceMark rm(THREAD); | |
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396 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK); |
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397 // (That's all, folks.) |
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398 } |
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399 |
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400 |
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401 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, Array<Method*>* methods, TRAPS) |
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402 : _klass(klass), |
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403 _pool(cpool), |
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404 _methods(methods) |
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405 { |
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406 assert(_pool->cache() == NULL, "constant pool cache must not be set yet"); |
0 | 407 |
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408 // determine index maps for Method* rewriting |
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409 compute_index_maps(); |
0 | 410 |
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411 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) { |
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412 bool did_rewrite = false; |
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413 int i = _methods->length(); |
0 | 414 while (i-- > 0) { |
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415 Method* method = _methods->at(i); |
0 | 416 if (method->intrinsic_id() == vmIntrinsics::_Object_init) { |
417 // rewrite the return bytecodes of Object.<init> to register the | |
418 // object for finalization if needed. | |
419 methodHandle m(THREAD, method); | |
420 rewrite_Object_init(m, CHECK); | |
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421 did_rewrite = true; |
0 | 422 break; |
423 } | |
424 } | |
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425 assert(did_rewrite, "must find Object::<init> to rewrite it"); |
0 | 426 } |
427 | |
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428 // rewrite methods, in two passes |
3404 | 429 int len = _methods->length(); |
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430 |
3404 | 431 for (int i = len-1; i >= 0; i--) { |
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432 Method* method = _methods->at(i); |
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433 scan_method(method); |
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434 } |
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435 |
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436 // allocate constant pool cache, now that we've seen all the bytecodes |
3404 | 437 make_constant_pool_cache(THREAD); |
438 | |
439 // Restore bytecodes to their unrewritten state if there are exceptions | |
440 // rewriting bytecodes or allocating the cpCache | |
441 if (HAS_PENDING_EXCEPTION) { | |
442 restore_bytecodes(); | |
443 return; | |
444 } | |
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445 |
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446 // Relocate after everything, but still do this under the is_rewritten flag, |
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447 // so methods with jsrs in custom class lists in aren't attempted to be |
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448 // rewritten in the RO section of the shared archive. |
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449 // Relocated bytecodes don't have to be restored, only the cp cache entries |
3404 | 450 for (int i = len-1; i >= 0; i--) { |
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451 methodHandle m(THREAD, _methods->at(i)); |
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452 |
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453 if (m->has_jsrs()) { |
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454 m = rewrite_jsrs(m, THREAD); |
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455 // Restore bytecodes to their unrewritten state if there are exceptions |
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456 // relocating bytecodes. If some are relocated, that is ok because that |
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457 // doesn't affect constant pool to cpCache rewriting. |
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coleenp
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6822
diff
changeset
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458 if (HAS_PENDING_EXCEPTION) { |
cc6a617fffd2
8005494: SIGSEGV in Rewriter::relocate_and_link() when testing Weblogic with CompressedOops and KlassPtrs
coleenp
parents:
6822
diff
changeset
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459 restore_bytecodes(); |
cc6a617fffd2
8005494: SIGSEGV in Rewriter::relocate_and_link() when testing Weblogic with CompressedOops and KlassPtrs
coleenp
parents:
6822
diff
changeset
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460 return; |
cc6a617fffd2
8005494: SIGSEGV in Rewriter::relocate_and_link() when testing Weblogic with CompressedOops and KlassPtrs
coleenp
parents:
6822
diff
changeset
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461 } |
0 | 462 // Method might have gotten rewritten. |
6725
da91efe96a93
6964458: Reimplement class meta-data storage to use native memory
coleenp
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6266
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463 methods->at_put(i, m()); |
0 | 464 } |
465 } | |
466 } |