Mercurial > hg > graal-jvmci-8
annotate src/share/vm/interpreter/rewriter.cpp @ 6266:1d7922586cf6
7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>
author | twisti |
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date | Tue, 24 Jul 2012 10:51:00 -0700 |
parents | d3b9f2be46ab |
children | 957c266d8bc5 da91efe96a93 |
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" | |
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36 #include "prims/methodHandles.hpp" |
0 | 37 |
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38 // Computes a CPC map (new_index -> original_index) for constant pool entries |
0 | 39 // that are referred to by the interpreter at runtime via the constant pool cache. |
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40 // Also computes a CP map (original_index -> new_index). |
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41 // Marks entries in CP which require additional processing. |
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42 void Rewriter::compute_index_maps() { |
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43 const int length = _pool->length(); |
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44 init_cp_map(length); |
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45 bool saw_mh_symbol = false; |
0 | 46 for (int i = 0; i < length; i++) { |
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47 int tag = _pool->tag_at(i).value(); |
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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 add_cp_cache_entry(i); |
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56 break; |
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57 case JVM_CONSTANT_Utf8: |
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58 if (_pool->symbol_at(i) == vmSymbols::java_lang_invoke_MethodHandle()) |
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59 saw_mh_symbol = true; |
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60 break; |
0 | 61 } |
62 } | |
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63 |
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64 guarantee((int)_cp_cache_map.length()-1 <= (int)((u2)-1), |
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65 "all cp cache indexes fit in a u2"); |
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66 |
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67 if (saw_mh_symbol) |
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68 _method_handle_invokers.initialize(length, (int)0); |
0 | 69 } |
70 | |
3748 | 71 // Unrewrite the bytecodes if an error occurs. |
72 void Rewriter::restore_bytecodes() { | |
73 int len = _methods->length(); | |
74 | |
75 for (int i = len-1; i >= 0; i--) { | |
76 methodOop method = (methodOop)_methods->obj_at(i); | |
77 scan_method(method, true); | |
78 } | |
79 } | |
0 | 80 |
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81 // Creates a constant pool cache given a CPC map |
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82 void Rewriter::make_constant_pool_cache(TRAPS) { |
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83 const int length = _cp_cache_map.length(); |
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84 constantPoolCacheOop cache = |
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85 oopFactory::new_constantPoolCache(length, CHECK); |
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86 No_Safepoint_Verifier nsv; |
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87 cache->initialize(_cp_cache_map); |
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88 _pool->set_cache(cache); |
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89 cache->set_constant_pool(_pool()); |
0 | 90 } |
91 | |
92 | |
93 | |
94 // The new finalization semantics says that registration of | |
95 // finalizable objects must be performed on successful return from the | |
96 // Object.<init> constructor. We could implement this trivially if | |
97 // <init> were never rewritten but since JVMTI allows this to occur, a | |
98 // more complicated solution is required. A special return bytecode | |
99 // is used only by Object.<init> to signal the finalization | |
100 // registration point. Additionally local 0 must be preserved so it's | |
101 // available to pass to the registration function. For simplicty we | |
102 // require that local 0 is never overwritten so it's available as an | |
103 // argument for registration. | |
104 | |
105 void Rewriter::rewrite_Object_init(methodHandle method, TRAPS) { | |
106 RawBytecodeStream bcs(method); | |
107 while (!bcs.is_last_bytecode()) { | |
108 Bytecodes::Code opcode = bcs.raw_next(); | |
109 switch (opcode) { | |
110 case Bytecodes::_return: *bcs.bcp() = Bytecodes::_return_register_finalizer; break; | |
111 | |
112 case Bytecodes::_istore: | |
113 case Bytecodes::_lstore: | |
114 case Bytecodes::_fstore: | |
115 case Bytecodes::_dstore: | |
116 case Bytecodes::_astore: | |
117 if (bcs.get_index() != 0) continue; | |
118 | |
119 // fall through | |
120 case Bytecodes::_istore_0: | |
121 case Bytecodes::_lstore_0: | |
122 case Bytecodes::_fstore_0: | |
123 case Bytecodes::_dstore_0: | |
124 case Bytecodes::_astore_0: | |
125 THROW_MSG(vmSymbols::java_lang_IncompatibleClassChangeError(), | |
126 "can't overwrite local 0 in Object.<init>"); | |
127 break; | |
128 } | |
129 } | |
130 } | |
131 | |
132 | |
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133 // Rewrite a classfile-order CP index into a native-order CPC index. |
3748 | 134 void Rewriter::rewrite_member_reference(address bcp, int offset, bool reverse) { |
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135 address p = bcp + offset; |
3748 | 136 if (!reverse) { |
137 int cp_index = Bytes::get_Java_u2(p); | |
138 int cache_index = cp_entry_to_cp_cache(cp_index); | |
139 Bytes::put_native_u2(p, cache_index); | |
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140 if (!_method_handle_invokers.is_empty()) |
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141 maybe_rewrite_invokehandle(p - 1, cp_index, reverse); |
3748 | 142 } else { |
143 int cache_index = Bytes::get_native_u2(p); | |
144 int pool_index = cp_cache_entry_pool_index(cache_index); | |
145 Bytes::put_Java_u2(p, pool_index); | |
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146 if (!_method_handle_invokers.is_empty()) |
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147 maybe_rewrite_invokehandle(p - 1, pool_index, reverse); |
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148 } |
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149 } |
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150 |
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151 |
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152 // Adjust the invocation bytecode for a signature-polymorphic method (MethodHandle.invoke, etc.) |
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153 void Rewriter::maybe_rewrite_invokehandle(address opc, int cp_index, bool reverse) { |
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154 if (!reverse) { |
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155 if ((*opc) == (u1)Bytecodes::_invokevirtual || |
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156 // allow invokespecial as an alias, although it would be very odd: |
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157 (*opc) == (u1)Bytecodes::_invokespecial) { |
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158 assert(_pool->tag_at(cp_index).is_method(), "wrong index"); |
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159 // Determine whether this is a signature-polymorphic method. |
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160 if (cp_index >= _method_handle_invokers.length()) return; |
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161 int status = _method_handle_invokers[cp_index]; |
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162 assert(status >= -1 && status <= 1, "oob tri-state"); |
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163 if (status == 0) { |
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164 if (_pool->klass_ref_at_noresolve(cp_index) == vmSymbols::java_lang_invoke_MethodHandle() && |
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165 MethodHandles::is_signature_polymorphic_name(SystemDictionary::MethodHandle_klass(), |
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166 _pool->name_ref_at(cp_index))) |
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167 status = +1; |
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168 else |
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169 status = -1; |
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170 _method_handle_invokers[cp_index] = status; |
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171 } |
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172 // We use a special internal bytecode for such methods (if non-static). |
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173 // The basic reason for this is that such methods need an extra "appendix" argument |
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174 // to transmit the call site's intended call type. |
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175 if (status > 0) { |
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176 (*opc) = (u1)Bytecodes::_invokehandle; |
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177 } |
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178 } |
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179 } else { |
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180 // Do not need to look at cp_index. |
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181 if ((*opc) == (u1)Bytecodes::_invokehandle) { |
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182 (*opc) = (u1)Bytecodes::_invokevirtual; |
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183 // Ignore corner case of original _invokespecial instruction. |
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184 // This is safe because (a) the signature polymorphic method was final, and |
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185 // (b) the implementation of MethodHandle will not call invokespecial on it. |
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186 } |
3748 | 187 } |
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188 } |
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189 |
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190 |
3748 | 191 void Rewriter::rewrite_invokedynamic(address bcp, int offset, bool reverse) { |
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192 address p = bcp + offset; |
3748 | 193 assert(p[-1] == Bytecodes::_invokedynamic, "not invokedynamic bytecode"); |
194 if (!reverse) { | |
195 int cp_index = Bytes::get_Java_u2(p); | |
196 int cpc = maybe_add_cp_cache_entry(cp_index); // add lazily | |
197 int cpc2 = add_secondary_cp_cache_entry(cpc); | |
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198 |
3748 | 199 // Replace the trailing four bytes with a CPC index for the dynamic |
200 // call site. Unlike other CPC entries, there is one per bytecode, | |
201 // not just one per distinct CP entry. In other words, the | |
202 // CPC-to-CP relation is many-to-one for invokedynamic entries. | |
203 // This means we must use a larger index size than u2 to address | |
204 // all these entries. That is the main reason invokedynamic | |
205 // must have a five-byte instruction format. (Of course, other JVM | |
206 // implementations can use the bytes for other purposes.) | |
207 Bytes::put_native_u4(p, constantPoolCacheOopDesc::encode_secondary_index(cpc2)); | |
208 // Note: We use native_u4 format exclusively for 4-byte indexes. | |
209 } else { | |
210 int cache_index = constantPoolCacheOopDesc::decode_secondary_index( | |
211 Bytes::get_native_u4(p)); | |
212 int secondary_index = cp_cache_secondary_entry_main_index(cache_index); | |
213 int pool_index = cp_cache_entry_pool_index(secondary_index); | |
214 assert(_pool->tag_at(pool_index).is_invoke_dynamic(), "wrong index"); | |
215 // zero out 4 bytes | |
216 Bytes::put_Java_u4(p, 0); | |
217 Bytes::put_Java_u2(p, pool_index); | |
218 } | |
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219 } |
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220 |
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221 |
1602 | 222 // Rewrite some ldc bytecodes to _fast_aldc |
3748 | 223 void Rewriter::maybe_rewrite_ldc(address bcp, int offset, bool is_wide, |
224 bool reverse) { | |
225 if (!reverse) { | |
226 assert((*bcp) == (is_wide ? Bytecodes::_ldc_w : Bytecodes::_ldc), "not ldc bytecode"); | |
227 address p = bcp + offset; | |
228 int cp_index = is_wide ? Bytes::get_Java_u2(p) : (u1)(*p); | |
229 constantTag tag = _pool->tag_at(cp_index).value(); | |
230 if (tag.is_method_handle() || tag.is_method_type()) { | |
231 int cache_index = cp_entry_to_cp_cache(cp_index); | |
232 if (is_wide) { | |
233 (*bcp) = Bytecodes::_fast_aldc_w; | |
234 assert(cache_index == (u2)cache_index, "index overflow"); | |
235 Bytes::put_native_u2(p, cache_index); | |
236 } else { | |
237 (*bcp) = Bytecodes::_fast_aldc; | |
238 assert(cache_index == (u1)cache_index, "index overflow"); | |
239 (*p) = (u1)cache_index; | |
240 } | |
241 } | |
242 } else { | |
243 Bytecodes::Code rewritten_bc = | |
244 (is_wide ? Bytecodes::_fast_aldc_w : Bytecodes::_fast_aldc); | |
245 if ((*bcp) == rewritten_bc) { | |
246 address p = bcp + offset; | |
247 int cache_index = is_wide ? Bytes::get_native_u2(p) : (u1)(*p); | |
248 int pool_index = cp_cache_entry_pool_index(cache_index); | |
249 if (is_wide) { | |
250 (*bcp) = Bytecodes::_ldc_w; | |
251 assert(pool_index == (u2)pool_index, "index overflow"); | |
252 Bytes::put_Java_u2(p, pool_index); | |
253 } else { | |
254 (*bcp) = Bytecodes::_ldc; | |
255 assert(pool_index == (u1)pool_index, "index overflow"); | |
256 (*p) = (u1)pool_index; | |
257 } | |
1602 | 258 } |
259 } | |
260 } | |
261 | |
262 | |
0 | 263 // Rewrites a method given the index_map information |
3748 | 264 void Rewriter::scan_method(methodOop method, bool reverse) { |
0 | 265 |
266 int nof_jsrs = 0; | |
267 bool has_monitor_bytecodes = false; | |
268 | |
269 { | |
270 // We cannot tolerate a GC in this block, because we've | |
271 // cached the bytecodes in 'code_base'. If the methodOop | |
272 // moves, the bytecodes will also move. | |
273 No_Safepoint_Verifier nsv; | |
274 Bytecodes::Code c; | |
275 | |
276 // Bytecodes and their length | |
277 const address code_base = method->code_base(); | |
278 const int code_length = method->code_size(); | |
279 | |
280 int bc_length; | |
281 for (int bci = 0; bci < code_length; bci += bc_length) { | |
282 address bcp = code_base + bci; | |
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283 int prefix_length = 0; |
0 | 284 c = (Bytecodes::Code)(*bcp); |
285 | |
286 // Since we have the code, see if we can get the length | |
287 // directly. Some more complicated bytecodes will report | |
288 // a length of zero, meaning we need to make another method | |
289 // call to calculate the length. | |
290 bc_length = Bytecodes::length_for(c); | |
291 if (bc_length == 0) { | |
2142 | 292 bc_length = Bytecodes::length_at(method, bcp); |
0 | 293 |
294 // length_at will put us at the bytecode after the one modified | |
295 // by 'wide'. We don't currently examine any of the bytecodes | |
296 // modified by wide, but in case we do in the future... | |
297 if (c == Bytecodes::_wide) { | |
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298 prefix_length = 1; |
0 | 299 c = (Bytecodes::Code)bcp[1]; |
300 } | |
301 } | |
302 | |
303 assert(bc_length != 0, "impossible bytecode length"); | |
304 | |
305 switch (c) { | |
306 case Bytecodes::_lookupswitch : { | |
307 #ifndef CC_INTERP | |
2142 | 308 Bytecode_lookupswitch bc(method, bcp); |
1565 | 309 (*bcp) = ( |
2142 | 310 bc.number_of_pairs() < BinarySwitchThreshold |
0 | 311 ? Bytecodes::_fast_linearswitch |
312 : Bytecodes::_fast_binaryswitch | |
313 ); | |
314 #endif | |
315 break; | |
316 } | |
3748 | 317 case Bytecodes::_fast_linearswitch: |
318 case Bytecodes::_fast_binaryswitch: { | |
319 #ifndef CC_INTERP | |
320 (*bcp) = Bytecodes::_lookupswitch; | |
321 #endif | |
322 break; | |
323 } | |
0 | 324 case Bytecodes::_getstatic : // fall through |
325 case Bytecodes::_putstatic : // fall through | |
326 case Bytecodes::_getfield : // fall through | |
327 case Bytecodes::_putfield : // fall through | |
328 case Bytecodes::_invokevirtual : // fall through | |
329 case Bytecodes::_invokespecial : // fall through | |
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330 case Bytecodes::_invokestatic : |
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331 case Bytecodes::_invokeinterface: |
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332 case Bytecodes::_invokehandle : // if reverse=true |
3748 | 333 rewrite_member_reference(bcp, prefix_length+1, reverse); |
0 | 334 break; |
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335 case Bytecodes::_invokedynamic: |
3748 | 336 rewrite_invokedynamic(bcp, prefix_length+1, reverse); |
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337 break; |
1602 | 338 case Bytecodes::_ldc: |
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339 case Bytecodes::_fast_aldc: // if reverse=true |
3748 | 340 maybe_rewrite_ldc(bcp, prefix_length+1, false, reverse); |
1602 | 341 break; |
342 case Bytecodes::_ldc_w: | |
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343 case Bytecodes::_fast_aldc_w: // if reverse=true |
3748 | 344 maybe_rewrite_ldc(bcp, prefix_length+1, true, reverse); |
1602 | 345 break; |
0 | 346 case Bytecodes::_jsr : // fall through |
347 case Bytecodes::_jsr_w : nof_jsrs++; break; | |
348 case Bytecodes::_monitorenter : // fall through | |
349 case Bytecodes::_monitorexit : has_monitor_bytecodes = true; break; | |
350 } | |
351 } | |
352 } | |
353 | |
354 // Update access flags | |
355 if (has_monitor_bytecodes) { | |
356 method->set_has_monitor_bytecodes(); | |
357 } | |
358 | |
359 // The present of a jsr bytecode implies that the method might potentially | |
360 // have to be rewritten, so we run the oopMapGenerator on the method | |
361 if (nof_jsrs > 0) { | |
362 method->set_has_jsrs(); | |
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363 // Second pass will revisit this method. |
3748 | 364 assert(method->has_jsrs(), "didn't we just set this?"); |
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365 } |
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366 } |
0 | 367 |
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368 // After constant pool is created, revisit methods containing jsrs. |
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369 methodHandle Rewriter::rewrite_jsrs(methodHandle method, TRAPS) { |
3748 | 370 ResourceMark rm(THREAD); |
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371 ResolveOopMapConflicts romc(method); |
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372 methodHandle original_method = method; |
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373 method = romc.do_potential_rewrite(CHECK_(methodHandle())); |
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374 if (method() != original_method()) { |
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375 // Insert invalid bytecode into original methodOop and set |
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376 // interpreter entrypoint, so that a executing this method |
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377 // will manifest itself in an easy recognizable form. |
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378 address bcp = original_method->bcp_from(0); |
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379 *bcp = (u1)Bytecodes::_shouldnotreachhere; |
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380 int kind = Interpreter::method_kind(original_method); |
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381 original_method->set_interpreter_kind(kind); |
0 | 382 } |
383 | |
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384 // Update monitor matching info. |
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385 if (romc.monitor_safe()) { |
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386 method->set_guaranteed_monitor_matching(); |
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387 } |
0 | 388 |
389 return method; | |
390 } | |
391 | |
392 void Rewriter::rewrite(instanceKlassHandle klass, TRAPS) { | |
393 ResourceMark rm(THREAD); | |
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394 Rewriter rw(klass, klass->constants(), klass->methods(), CHECK); |
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395 // (That's all, folks.) |
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396 } |
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397 |
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398 |
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399 void Rewriter::rewrite(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) { |
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400 ResourceMark rm(THREAD); |
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401 Rewriter rw(klass, cpool, methods, CHECK); |
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402 // (That's all, folks.) |
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403 } |
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404 |
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405 |
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406 Rewriter::Rewriter(instanceKlassHandle klass, constantPoolHandle cpool, objArrayHandle methods, TRAPS) |
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407 : _klass(klass), |
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408 _pool(cpool), |
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409 _methods(methods) |
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410 { |
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411 assert(_pool->cache() == NULL, "constant pool cache must not be set yet"); |
0 | 412 |
413 // determine index maps for methodOop rewriting | |
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414 compute_index_maps(); |
0 | 415 |
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416 if (RegisterFinalizersAtInit && _klass->name() == vmSymbols::java_lang_Object()) { |
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417 bool did_rewrite = false; |
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418 int i = _methods->length(); |
0 | 419 while (i-- > 0) { |
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420 methodOop method = (methodOop)_methods->obj_at(i); |
0 | 421 if (method->intrinsic_id() == vmIntrinsics::_Object_init) { |
422 // rewrite the return bytecodes of Object.<init> to register the | |
423 // object for finalization if needed. | |
424 methodHandle m(THREAD, method); | |
425 rewrite_Object_init(m, CHECK); | |
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426 did_rewrite = true; |
0 | 427 break; |
428 } | |
429 } | |
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430 assert(did_rewrite, "must find Object::<init> to rewrite it"); |
0 | 431 } |
432 | |
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433 // rewrite methods, in two passes |
3748 | 434 int len = _methods->length(); |
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435 |
3748 | 436 for (int i = len-1; i >= 0; i--) { |
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437 methodOop method = (methodOop)_methods->obj_at(i); |
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438 scan_method(method); |
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439 } |
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440 |
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441 // allocate constant pool cache, now that we've seen all the bytecodes |
3748 | 442 make_constant_pool_cache(THREAD); |
443 | |
444 // Restore bytecodes to their unrewritten state if there are exceptions | |
445 // rewriting bytecodes or allocating the cpCache | |
446 if (HAS_PENDING_EXCEPTION) { | |
447 restore_bytecodes(); | |
448 return; | |
449 } | |
450 } | |
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451 |
3748 | 452 // Relocate jsr/rets in a method. This can't be done with the rewriter |
453 // stage because it can throw other exceptions, leaving the bytecodes | |
454 // pointing at constant pool cache entries. | |
455 // Link and check jvmti dependencies while we're iterating over the methods. | |
456 // JSR292 code calls with a different set of methods, so two entry points. | |
457 void Rewriter::relocate_and_link(instanceKlassHandle this_oop, TRAPS) { | |
458 objArrayHandle methods(THREAD, this_oop->methods()); | |
459 relocate_and_link(this_oop, methods, THREAD); | |
460 } | |
461 | |
462 void Rewriter::relocate_and_link(instanceKlassHandle this_oop, | |
463 objArrayHandle methods, TRAPS) { | |
464 int len = methods->length(); | |
465 for (int i = len-1; i >= 0; i--) { | |
466 methodHandle m(THREAD, (methodOop)methods->obj_at(i)); | |
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467 |
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468 if (m->has_jsrs()) { |
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469 m = rewrite_jsrs(m, CHECK); |
0 | 470 // Method might have gotten rewritten. |
3748 | 471 methods->obj_at_put(i, m()); |
0 | 472 } |
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473 |
3748 | 474 // Set up method entry points for compiler and interpreter . |
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475 m->link_method(m, CHECK); |
1574 | 476 |
3748 | 477 // This is for JVMTI and unrelated to relocator but the last thing we do |
1574 | 478 #ifdef ASSERT |
479 if (StressMethodComparator) { | |
480 static int nmc = 0; | |
481 for (int j = i; j >= 0 && j >= i-4; j--) { | |
482 if ((++nmc % 1000) == 0) tty->print_cr("Have run MethodComparator %d times...", nmc); | |
3748 | 483 bool z = MethodComparator::methods_EMCP(m(), |
484 (methodOop)methods->obj_at(j)); | |
1574 | 485 if (j == i && !z) { |
486 tty->print("MethodComparator FAIL: "); m->print(); m->print_codes(); | |
487 assert(z, "method must compare equal to itself"); | |
488 } | |
489 } | |
490 } | |
491 #endif //ASSERT | |
0 | 492 } |
493 } |