Mercurial > hg > truffle
annotate src/share/vm/interpreter/rewriter.cpp @ 2176:27e4ea99855d
Merge
author | johnc |
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date | Thu, 27 Jan 2011 13:42:28 -0800 |
parents | 8012aa3ccede |
children | d25d4ca69222 c5a923563727 |
rev | line source |
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0 | 1 /* |
2142 | 2 * Copyright (c) 1998, 2011, 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/oopFactory.hpp" | |
31 #include "memory/resourceArea.hpp" | |
32 #include "oops/generateOopMap.hpp" | |
33 #include "oops/objArrayOop.hpp" | |
34 #include "oops/oop.inline.hpp" | |
35 #include "prims/methodComparator.hpp" | |
0 | 36 |
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37 // Computes a CPC map (new_index -> original_index) for constant pool entries |
0 | 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; |
0 | 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: |
0 | 50 case JVM_CONSTANT_Fieldref : // fall through |
51 case JVM_CONSTANT_Methodref : // fall through | |
1602 | 52 case JVM_CONSTANT_MethodHandle : // fall through |
53 case JVM_CONSTANT_MethodType : // fall through | |
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54 case JVM_CONSTANT_InvokeDynamic : // fall through |
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55 case JVM_CONSTANT_InvokeDynamicTrans: // fall through |
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56 add_cp_cache_entry(i); |
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57 break; |
0 | 58 } |
59 } | |
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60 |
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61 guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1), |
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62 "all cp cache indexes fit in a u2"); |
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63 |
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64 _have_invoke_dynamic = ((tag_mask & (1 << JVM_CONSTANT_InvokeDynamic)) != 0); |
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65 _have_invoke_dynamic |= ((tag_mask & (1 << JVM_CONSTANT_InvokeDynamicTrans)) != 0); |
0 | 66 } |
67 | |
68 | |
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69 // Creates a constant pool cache given a CPC map |
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70 // This creates the constant pool cache initially in a state |
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71 // that is unsafe for concurrent GC processing but sets it to |
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72 // a safe mode before the constant pool cache is returned. |
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73 void Rewriter::make_constant_pool_cache(TRAPS) { |
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74 const int length = _cp_cache_map.length(); |
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75 constantPoolCacheOop cache = |
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76 oopFactory::new_constantPoolCache(length, methodOopDesc::IsUnsafeConc, CHECK); |
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77 cache->initialize(_cp_cache_map); |
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78 |
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79 // Don't bother with the next pass if there is no JVM_CONSTANT_InvokeDynamic. |
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80 if (_have_invoke_dynamic) { |
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81 for (int i = 0; i < length; i++) { |
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82 int pool_index = cp_cache_entry_pool_index(i); |
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83 if (pool_index >= 0 && |
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84 _pool->tag_at(pool_index).is_invoke_dynamic()) { |
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85 int bsm_index = _pool->invoke_dynamic_bootstrap_method_ref_index_at(pool_index); |
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86 if (bsm_index != 0) { |
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87 assert(_pool->tag_at(bsm_index).is_method_handle(), "must be a MH constant"); |
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88 // There is a CP cache entry holding the BSM for these calls. |
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89 int bsm_cache_index = cp_entry_to_cp_cache(bsm_index); |
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90 cache->entry_at(i)->initialize_bootstrap_method_index_in_cache(bsm_cache_index); |
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91 } else { |
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92 // There is no CP cache entry holding the BSM for these calls. |
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93 // We will need to look for a class-global BSM, later. |
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94 guarantee(AllowTransitionalJSR292, ""); |
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95 } |
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96 } |
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97 } |
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98 } |
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99 |
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100 _pool->set_cache(cache); |
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101 cache->set_constant_pool(_pool()); |
0 | 102 } |
103 | |
104 | |
105 | |
106 // The new finalization semantics says that registration of | |
107 // finalizable objects must be performed on successful return from the | |
108 // Object.<init> constructor. We could implement this trivially if | |
109 // <init> were never rewritten but since JVMTI allows this to occur, a | |
110 // more complicated solution is required. A special return bytecode | |
111 // is used only by Object.<init> to signal the finalization | |
112 // registration point. Additionally local 0 must be preserved so it's | |
113 // available to pass to the registration function. For simplicty we | |
114 // require that local 0 is never overwritten so it's available as an | |
115 // argument for registration. | |
116 | |
117 void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) { | |
118 RawBytecodeStream bcs(method); | |
119 while (!bcs.is_last_bytecode()) { | |
120 Bytecodes::Code opcode = bcs.raw_next(); | |
121 switch (opcode) { | |
122 case Bytecodes::_return: *bcs.bcp() = Bytecodes::_return_register_finalizer; break; | |
123 | |
124 case Bytecodes::_istore: | |
125 case Bytecodes::_lstore: | |
126 case Bytecodes::_fstore: | |
127 case Bytecodes::_dstore: | |
128 case Bytecodes::_astore: | |
129 if (bcs.get_index() != 0) continue; | |
130 | |
131 // fall through | |
132 case Bytecodes::_istore_0: | |
133 case Bytecodes::_lstore_0: | |
134 case Bytecodes::_fstore_0: | |
135 case Bytecodes::_dstore_0: | |
136 case Bytecodes::_astore_0: | |
137 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), | |
138 "can't overwrite local 0 in Object.<init>"); | |
139 break; | |
140 } | |
141 } | |
142 } | |
143 | |
144 | |
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145 // Rewrite a classfile-order CP index into a native-order CPC index. |
1565 | 146 void Rewriter::rewrite_member_reference(address bcp, int offset) { |
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147 address p = bcp + offset; |
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148 int cp_index = Bytes::get_Java_u2(p); |
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149 int cache_index = cp_entry_to_cp_cache(cp_index); |
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150 Bytes::put_native_u2(p, cache_index); |
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151 } |
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152 |
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153 |
1565 | 154 void Rewriter::rewrite_invokedynamic(address bcp, int offset) { |
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155 address p = bcp + offset; |
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156 assert(p[-1] == Bytecodes::_invokedynamic, ""); |
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157 int cp_index = Bytes::get_Java_u2(p); |
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158 int cpc = maybe_add_cp_cache_entry(cp_index); // add lazily |
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159 int cpc2 = add_secondary_cp_cache_entry(cpc); |
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160 |
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161 // Replace the trailing four bytes with a CPC index for the dynamic |
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162 // call site. Unlike other CPC entries, there is one per bytecode, |
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163 // not just one per distinct CP entry. In other words, the |
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164 // CPC-to-CP relation is many-to-one for invokedynamic entries. |
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165 // This means we must use a larger index size than u2 to address |
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166 // all these entries. That is the main reason invokedynamic |
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167 // must have a five-byte instruction format. (Of course, other JVM |
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168 // implementations can use the bytes for other purposes.) |
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169 Bytes::put_native_u4(p, constantPoolCacheOopDesc::encode_secondary_index(cpc2)); |
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170 // Note: We use native_u4 format exclusively for 4-byte indexes. |
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171 } |
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172 |
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173 |
1602 | 174 // Rewrite some ldc bytecodes to _fast_aldc |
175 void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide) { | |
176 assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), ""); | |
177 address p = bcp + offset; | |
178 int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p); | |
179 constantTag tag = _pool->tag_at(cp_index).value(); | |
180 if (tag.is_method_handle() || tag.is_method_type()) { | |
181 int cache_index = cp_entry_to_cp_cache(cp_index); | |
182 if (is_wide) { | |
183 (*bcp) = Bytecodes::_fast_aldc_w; | |
184 assert(cache_index == (u2)cache_index, ""); | |
185 Bytes::put_native_u2(p, cache_index); | |
186 } else { | |
187 (*bcp) = Bytecodes::_fast_aldc; | |
188 assert(cache_index == (u1)cache_index, ""); | |
189 (*p) = (u1)cache_index; | |
190 } | |
191 } | |
192 } | |
193 | |
194 | |
0 | 195 // Rewrites a method given the index_map information |
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196 void Rewriter::scan_method(methodOop method) { |
0 | 197 |
198 int nof_jsrs = 0; | |
199 bool has_monitor_bytecodes = false; | |
200 | |
201 { | |
202 // We cannot tolerate a GC in this block, because we've | |
203 // cached the bytecodes in 'code_base'. If the methodOop | |
204 // moves, the bytecodes will also move. | |
205 No_Safepoint_Verifier nsv; | |
206 Bytecodes::Code c; | |
207 | |
208 // Bytecodes and their length | |
209 const address code_base = method->code_base(); | |
210 const int code_length = method->code_size(); | |
211 | |
212 int bc_length; | |
213 for (int bci = 0; bci < code_length; bci += bc_length) { | |
214 address bcp = code_base + bci; | |
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215 int prefix_length = 0; |
0 | 216 c = (Bytecodes::Code)(*bcp); |
217 | |
218 // Since we have the code, see if we can get the length | |
219 // directly. Some more complicated bytecodes will report | |
220 // a length of zero, meaning we need to make another method | |
221 // call to calculate the length. | |
222 bc_length = Bytecodes::length_for(c); | |
223 if (bc_length == 0) { | |
2142 | 224 bc_length = Bytecodes::length_at(method, bcp); |
0 | 225 |
226 // length_at will put us at the bytecode after the one modified | |
227 // by 'wide'. We don't currently examine any of the bytecodes | |
228 // modified by wide, but in case we do in the future... | |
229 if (c == Bytecodes::_wide) { | |
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230 prefix_length = 1; |
0 | 231 c = (Bytecodes::Code)bcp[1]; |
232 } | |
233 } | |
234 | |
235 assert(bc_length != 0, "impossible bytecode length"); | |
236 | |
237 switch (c) { | |
238 case Bytecodes::_lookupswitch : { | |
239 #ifndef CC_INTERP | |
2142 | 240 Bytecode_lookupswitch bc(method, bcp); |
1565 | 241 (*bcp) = ( |
2142 | 242 bc.number_of_pairs() < BinarySwitchThreshold |
0 | 243 ? Bytecodes::_fast_linearswitch |
244 : Bytecodes::_fast_binaryswitch | |
245 ); | |
246 #endif | |
247 break; | |
248 } | |
249 case Bytecodes::_getstatic : // fall through | |
250 case Bytecodes::_putstatic : // fall through | |
251 case Bytecodes::_getfield : // fall through | |
252 case Bytecodes::_putfield : // fall through | |
253 case Bytecodes::_invokevirtual : // fall through | |
254 case Bytecodes::_invokespecial : // fall through | |
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255 case Bytecodes::_invokestatic : |
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256 case Bytecodes::_invokeinterface: |
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257 rewrite_member_reference(bcp, prefix_length+1); |
0 | 258 break; |
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259 case Bytecodes::_invokedynamic: |
1565 | 260 rewrite_invokedynamic(bcp, prefix_length+1); |
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261 break; |
1602 | 262 case Bytecodes::_ldc: |
263 maybe_rewrite_ldc(bcp, prefix_length+1, false); | |
264 break; | |
265 case Bytecodes::_ldc_w: | |
266 maybe_rewrite_ldc(bcp, prefix_length+1, true); | |
267 break; | |
0 | 268 case Bytecodes::_jsr : // fall through |
269 case Bytecodes::_jsr_w : nof_jsrs++; break; | |
270 case Bytecodes::_monitorenter : // fall through | |
271 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break; | |
272 } | |
273 } | |
274 } | |
275 | |
276 // Update access flags | |
277 if (has_monitor_bytecodes) { | |
278 method->set_has_monitor_bytecodes(); | |
279 } | |
280 | |
281 // The present of a jsr bytecode implies that the method might potentially | |
282 // have to be rewritten, so we run the oopMapGenerator on the method | |
283 if (nof_jsrs > 0) { | |
284 method->set_has_jsrs(); | |
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285 // Second pass will revisit this method. |
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286 assert(method->has_jsrs(), ""); |
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287 } |
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288 } |
0 | 289 |
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290 // After constant pool is created, revisit methods containing jsrs. |
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291 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) { |
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292 ResolveOopMapConflicts romc(method); |
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293 methodHandle original_method = method; |
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294 method = romc.do_potential_rewrite(CHECK_(methodHandle())); |
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295 if (method() != original_method()) { |
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296 // Insert invalid bytecode into original methodOop and set |
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297 // interpreter entrypoint, so that a executing this method |
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298 // will manifest itself in an easy recognizable form. |
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299 address bcp = original_method->bcp_from(0); |
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300 *bcp = (u1)Bytecodes::_shouldnotreachhere; |
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301 int kind = Interpreter::method_kind(original_method); |
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302 original_method->set_interpreter_kind(kind); |
0 | 303 } |
304 | |
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305 // Update monitor matching info. |
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306 if (romc.monitor_safe()) { |
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307 method->set_guaranteed_monitor_matching(); |
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308 } |
0 | 309 |
310 return method; | |
311 } | |
312 | |
313 | |
314 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) { | |
315 ResourceMark rm(THREAD); | |
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316 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK); |
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317 // (That's all, folks.) |
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318 } |
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319 |
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320 |
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321 void Rewriter::rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) { |
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322 ResourceMark rm(THREAD); |
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323 Rewriter rw(klass, cpool, methods, CHECK); |
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324 // (That's all, folks.) |
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325 } |
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326 |
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327 |
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328 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) |
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329 : _klass(klass), |
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330 _pool(cpool), |
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331 _methods(methods) |
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332 { |
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333 assert(_pool->cache() == NULL, "constant pool cache must not be set yet"); |
0 | 334 |
335 // determine index maps for methodOop rewriting | |
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336 compute_index_maps(); |
0 | 337 |
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338 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) { |
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339 bool did_rewrite = false; |
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340 int i = _methods->length(); |
0 | 341 while (i-- > 0) { |
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342 methodOop method = (methodOop)_methods->obj_at(i); |
0 | 343 if (method->intrinsic_id() == vmIntrinsics::_Object_init) { |
344 // rewrite the return bytecodes of Object.<init> to register the | |
345 // object for finalization if needed. | |
346 methodHandle m(THREAD, method); | |
347 rewrite_Object_init(m, CHECK); | |
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348 did_rewrite = true; |
0 | 349 break; |
350 } | |
351 } | |
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352 assert(did_rewrite, "must find Object::<init> to rewrite it"); |
0 | 353 } |
354 | |
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355 // rewrite methods, in two passes |
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356 int i, len = _methods->length(); |
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357 |
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358 for (i = len; --i >= 0; ) { |
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359 methodOop method = (methodOop)_methods->obj_at(i); |
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360 scan_method(method); |
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361 } |
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362 |
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363 // allocate constant pool cache, now that we've seen all the bytecodes |
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364 make_constant_pool_cache(CHECK); |
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365 |
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366 for (i = len; --i >= 0; ) { |
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367 methodHandle m(THREAD, (methodOop)_methods->obj_at(i)); |
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368 |
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369 if (m->has_jsrs()) { |
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370 m = rewrite_jsrs(m, CHECK); |
0 | 371 // Method might have gotten rewritten. |
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372 _methods->obj_at_put(i, m()); |
0 | 373 } |
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374 |
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375 // Set up method entry points for compiler and interpreter. |
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376 m->link_method(m, CHECK); |
1574 | 377 |
378 #ifdef ASSERT | |
379 if (StressMethodComparator) { | |
380 static int nmc = 0; | |
381 for (int j = i; j >= 0 && j >= i-4; j--) { | |
382 if ((++nmc % 1000) == 0) tty->print_cr("Have run MethodComparator %d times...", nmc); | |
383 bool z = MethodComparator::methods_EMCP(m(), (methodOop)_methods->obj_at(j)); | |
384 if (j == i && !z) { | |
385 tty->print("MethodComparator FAIL: "); m->print(); m->print_codes(); | |
386 assert(z, "method must compare equal to itself"); | |
387 } | |
388 } | |
389 } | |
390 #endif //ASSERT | |
0 | 391 } |
392 } |