Mercurial > hg > truffle
annotate src/share/vm/oops/method.cpp @ 8712:3efdfd6ddbf2
8003553: NPG: metaspace objects should be zeroed in constructors
Summary: Zero metadata in constructors, not in allocation (and some in constructors)
Reviewed-by: jmasa, sspitsyn
author | coleenp |
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date | Fri, 08 Mar 2013 11:47:57 -0500 |
parents | 927a311d00f9 |
children | 5939f5953b45 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 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" |
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26 #include "classfile/metadataOnStackMark.hpp" |
1972 | 27 #include "classfile/systemDictionary.hpp" |
28 #include "code/debugInfoRec.hpp" | |
29 #include "gc_interface/collectedHeap.inline.hpp" | |
30 #include "interpreter/bytecodeStream.hpp" | |
31 #include "interpreter/bytecodeTracer.hpp" | |
32 #include "interpreter/bytecodes.hpp" | |
33 #include "interpreter/interpreter.hpp" | |
34 #include "interpreter/oopMapCache.hpp" | |
35 #include "memory/gcLocker.hpp" | |
36 #include "memory/generation.hpp" | |
7956 | 37 #include "memory/heapInspection.hpp" |
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38 #include "memory/metadataFactory.hpp" |
1972 | 39 #include "memory/oopFactory.hpp" |
6934 | 40 #include "oops/constMethod.hpp" |
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41 #include "oops/methodData.hpp" |
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42 #include "oops/method.hpp" |
1972 | 43 #include "oops/oop.inline.hpp" |
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44 #include "oops/symbol.hpp" |
1972 | 45 #include "prims/jvmtiExport.hpp" |
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46 #include "prims/methodHandles.hpp" |
1972 | 47 #include "prims/nativeLookup.hpp" |
48 #include "runtime/arguments.hpp" | |
49 #include "runtime/compilationPolicy.hpp" | |
50 #include "runtime/frame.inline.hpp" | |
51 #include "runtime/handles.inline.hpp" | |
52 #include "runtime/relocator.hpp" | |
53 #include "runtime/sharedRuntime.hpp" | |
54 #include "runtime/signature.hpp" | |
3779 | 55 #include "utilities/quickSort.hpp" |
1972 | 56 #include "utilities/xmlstream.hpp" |
0 | 57 |
58 | |
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59 // Implementation of Method |
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60 |
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61 Method* Method::allocate(ClassLoaderData* loader_data, |
6934 | 62 int byte_code_size, |
63 AccessFlags access_flags, | |
8031 | 64 InlineTableSizes* sizes, |
6934 | 65 ConstMethod::MethodType method_type, |
66 TRAPS) { | |
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67 assert(!access_flags.is_native() || byte_code_size == 0, |
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68 "native methods should not contain byte codes"); |
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69 ConstMethod* cm = ConstMethod::allocate(loader_data, |
6934 | 70 byte_code_size, |
8031 | 71 sizes, |
6934 | 72 method_type, |
73 CHECK_NULL); | |
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74 |
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75 int size = Method::size(access_flags.is_native()); |
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76 |
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77 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size); |
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78 } |
0 | 79 |
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80 Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) { |
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81 No_Safepoint_Verifier no_safepoint; |
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82 set_constMethod(xconst); |
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83 set_access_flags(access_flags); |
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84 set_method_size(size); |
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85 #ifdef CC_INTERP |
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86 set_result_index(T_VOID); |
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87 #endif |
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88 set_intrinsic_id(vmIntrinsics::_none); |
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89 set_jfr_towrite(false); |
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90 set_method_data(NULL); |
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91 set_interpreter_throwout_count(0); |
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92 set_vtable_index(Method::garbage_vtable_index); |
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93 |
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94 // Fix and bury in Method* |
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95 set_interpreter_entry(NULL); // sets i2i entry and from_int |
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96 set_adapter_entry(NULL); |
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97 clear_code(); // from_c/from_i get set to c2i/i2i |
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98 |
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99 if (access_flags.is_native()) { |
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100 clear_native_function(); |
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101 set_signature_handler(NULL); |
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102 } |
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103 |
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104 NOT_PRODUCT(set_compiled_invocation_count(0);) |
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105 set_interpreter_invocation_count(0); |
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106 invocation_counter()->init(); |
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107 backedge_counter()->init(); |
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108 clear_number_of_breakpoints(); |
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109 |
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110 #ifdef TIERED |
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111 set_rate(0); |
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112 set_prev_event_count(0); |
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113 set_prev_time(0); |
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114 #endif |
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115 } |
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116 |
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117 // Release Method*. The nmethod will be gone when we get here because |
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118 // we've walked the code cache. |
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119 void Method::deallocate_contents(ClassLoaderData* loader_data) { |
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120 MetadataFactory::free_metadata(loader_data, constMethod()); |
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121 set_constMethod(NULL); |
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122 MetadataFactory::free_metadata(loader_data, method_data()); |
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123 set_method_data(NULL); |
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124 // The nmethod will be gone when we get here. |
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125 if (code() != NULL) _code = NULL; |
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126 } |
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127 |
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128 address Method::get_i2c_entry() { |
0 | 129 assert(_adapter != NULL, "must have"); |
130 return _adapter->get_i2c_entry(); | |
131 } | |
132 | |
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133 address Method::get_c2i_entry() { |
0 | 134 assert(_adapter != NULL, "must have"); |
135 return _adapter->get_c2i_entry(); | |
136 } | |
137 | |
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138 address Method::get_c2i_unverified_entry() { |
0 | 139 assert(_adapter != NULL, "must have"); |
140 return _adapter->get_c2i_unverified_entry(); | |
141 } | |
142 | |
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143 char* Method::name_and_sig_as_C_string() const { |
6983 | 144 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); |
0 | 145 } |
146 | |
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147 char* Method::name_and_sig_as_C_string(char* buf, int size) const { |
6983 | 148 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); |
0 | 149 } |
150 | |
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151 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { |
0 | 152 const char* klass_name = klass->external_name(); |
153 int klass_name_len = (int)strlen(klass_name); | |
154 int method_name_len = method_name->utf8_length(); | |
155 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); | |
156 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); | |
157 strcpy(dest, klass_name); | |
158 dest[klass_name_len] = '.'; | |
159 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); | |
160 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); | |
161 dest[len] = 0; | |
162 return dest; | |
163 } | |
164 | |
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165 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { |
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166 Symbol* klass_name = klass->name(); |
0 | 167 klass_name->as_klass_external_name(buf, size); |
168 int len = (int)strlen(buf); | |
169 | |
170 if (len < size - 1) { | |
171 buf[len++] = '.'; | |
172 | |
173 method_name->as_C_string(&(buf[len]), size - len); | |
174 len = (int)strlen(buf); | |
175 | |
176 signature->as_C_string(&(buf[len]), size - len); | |
177 } | |
178 | |
179 return buf; | |
180 } | |
181 | |
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182 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { |
0 | 183 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) |
184 // access exception table | |
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185 ExceptionTable table(mh()); |
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186 int length = table.length(); |
0 | 187 // iterate through all entries sequentially |
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188 constantPoolHandle pool(THREAD, mh->constants()); |
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189 for (int i = 0; i < length; i ++) { |
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190 //reacquire the table in case a GC happened |
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191 ExceptionTable table(mh()); |
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192 int beg_bci = table.start_pc(i); |
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193 int end_bci = table.end_pc(i); |
0 | 194 assert(beg_bci <= end_bci, "inconsistent exception table"); |
195 if (beg_bci <= throw_bci && throw_bci < end_bci) { | |
196 // exception handler bci range covers throw_bci => investigate further | |
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197 int handler_bci = table.handler_pc(i); |
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198 int klass_index = table.catch_type_index(i); |
0 | 199 if (klass_index == 0) { |
200 return handler_bci; | |
201 } else if (ex_klass.is_null()) { | |
202 return handler_bci; | |
203 } else { | |
204 // we know the exception class => get the constraint class | |
205 // this may require loading of the constraint class; if verification | |
206 // fails or some other exception occurs, return handler_bci | |
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207 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); |
0 | 208 KlassHandle klass = KlassHandle(THREAD, k); |
209 assert(klass.not_null(), "klass not loaded"); | |
210 if (ex_klass->is_subtype_of(klass())) { | |
211 return handler_bci; | |
212 } | |
213 } | |
214 } | |
215 } | |
216 | |
217 return -1; | |
218 } | |
219 | |
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220 void Method::mask_for(int bci, InterpreterOopMap* mask) { |
0 | 221 |
222 Thread* myThread = Thread::current(); | |
223 methodHandle h_this(myThread, this); | |
224 #ifdef ASSERT | |
225 bool has_capability = myThread->is_VM_thread() || | |
226 myThread->is_ConcurrentGC_thread() || | |
227 myThread->is_GC_task_thread(); | |
228 | |
229 if (!has_capability) { | |
230 if (!VerifyStack && !VerifyLastFrame) { | |
231 // verify stack calls this outside VM thread | |
232 warning("oopmap should only be accessed by the " | |
233 "VM, GC task or CMS threads (or during debugging)"); | |
234 InterpreterOopMap local_mask; | |
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235 method_holder()->mask_for(h_this, bci, &local_mask); |
0 | 236 local_mask.print(); |
237 } | |
238 } | |
239 #endif | |
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240 method_holder()->mask_for(h_this, bci, mask); |
0 | 241 return; |
242 } | |
243 | |
244 | |
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245 int Method::bci_from(address bcp) const { |
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246 #ifdef ASSERT |
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247 { ResourceMark rm; |
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248 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), |
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249 err_msg("bcp doesn't belong to this method: bcp: " INTPTR_FORMAT ", method: %s", bcp, name_and_sig_as_C_string())); |
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250 } |
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251 #endif |
0 | 252 return bcp - code_base(); |
253 } | |
254 | |
255 | |
256 // Return (int)bcx if it appears to be a valid BCI. | |
257 // Return bci_from((address)bcx) if it appears to be a valid BCP. | |
258 // Return -1 otherwise. | |
259 // Used by profiling code, when invalid data is a possibility. | |
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260 // The caller is responsible for validating the Method* itself. |
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261 int Method::validate_bci_from_bcx(intptr_t bcx) const { |
0 | 262 // keep bci as -1 if not a valid bci |
263 int bci = -1; | |
264 if (bcx == 0 || (address)bcx == code_base()) { | |
265 // code_size() may return 0 and we allow 0 here | |
266 // the method may be native | |
267 bci = 0; | |
268 } else if (frame::is_bci(bcx)) { | |
269 if (bcx < code_size()) { | |
270 bci = (int)bcx; | |
271 } | |
272 } else if (contains((address)bcx)) { | |
273 bci = (address)bcx - code_base(); | |
274 } | |
275 // Assert that if we have dodged any asserts, bci is negative. | |
276 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); | |
277 return bci; | |
278 } | |
279 | |
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280 address Method::bcp_from(int bci) const { |
0 | 281 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); |
282 address bcp = code_base() + bci; | |
283 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); | |
284 return bcp; | |
285 } | |
286 | |
287 | |
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288 int Method::size(bool is_native) { |
0 | 289 // If native, then include pointers for native_function and signature_handler |
290 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; | |
291 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; | |
292 return align_object_size(header_size() + extra_words); | |
293 } | |
294 | |
295 | |
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296 Symbol* Method::klass_name() const { |
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297 Klass* k = method_holder(); |
0 | 298 assert(k->is_klass(), "must be klass"); |
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299 InstanceKlass* ik = (InstanceKlass*) k; |
0 | 300 return ik->name(); |
301 } | |
302 | |
303 | |
304 // Attempt to return method oop to original state. Clear any pointers | |
305 // (to objects outside the shared spaces). We won't be able to predict | |
306 // where they should point in a new JVM. Further initialize some | |
307 // entries now in order allow them to be write protected later. | |
308 | |
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309 void Method::remove_unshareable_info() { |
0 | 310 unlink_method(); |
311 } | |
312 | |
313 | |
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314 bool Method::was_executed_more_than(int n) { |
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315 // Invocation counter is reset when the Method* is compiled. |
0 | 316 // If the method has compiled code we therefore assume it has |
317 // be excuted more than n times. | |
318 if (is_accessor() || is_empty_method() || (code() != NULL)) { | |
319 // interpreter doesn't bump invocation counter of trivial methods | |
320 // compiler does not bump invocation counter of compiled methods | |
321 return true; | |
1783 | 322 } |
323 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) { | |
0 | 324 // The carry bit is set when the counter overflows and causes |
325 // a compilation to occur. We don't know how many times | |
326 // the counter has been reset, so we simply assume it has | |
327 // been executed more than n times. | |
328 return true; | |
329 } else { | |
330 return invocation_count() > n; | |
331 } | |
332 } | |
333 | |
334 #ifndef PRODUCT | |
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335 void Method::print_invocation_count() { |
0 | 336 if (is_static()) tty->print("static "); |
337 if (is_final()) tty->print("final "); | |
338 if (is_synchronized()) tty->print("synchronized "); | |
339 if (is_native()) tty->print("native "); | |
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340 method_holder()->name()->print_symbol_on(tty); |
0 | 341 tty->print("."); |
342 name()->print_symbol_on(tty); | |
343 signature()->print_symbol_on(tty); | |
344 | |
345 if (WizardMode) { | |
346 // dump the size of the byte codes | |
347 tty->print(" {%d}", code_size()); | |
348 } | |
349 tty->cr(); | |
350 | |
351 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); | |
352 tty->print_cr (" invocation_counter: %8d ", invocation_count()); | |
353 tty->print_cr (" backedge_counter: %8d ", backedge_count()); | |
354 if (CountCompiledCalls) { | |
355 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); | |
356 } | |
357 | |
358 } | |
359 #endif | |
360 | |
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361 // Build a MethodData* object to hold information about this method |
0 | 362 // collected in the interpreter. |
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363 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { |
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364 // Do not profile method if current thread holds the pending list lock, |
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365 // which avoids deadlock for acquiring the MethodData_lock. |
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366 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { |
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367 return; |
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368 } |
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369 |
0 | 370 // Grab a lock here to prevent multiple |
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371 // MethodData*s from being created. |
0 | 372 MutexLocker ml(MethodData_lock, THREAD); |
373 if (method->method_data() == NULL) { | |
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374 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); |
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375 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); |
0 | 376 method->set_method_data(method_data); |
377 if (PrintMethodData && (Verbose || WizardMode)) { | |
378 ResourceMark rm(THREAD); | |
379 tty->print("build_interpreter_method_data for "); | |
380 method->print_name(tty); | |
381 tty->cr(); | |
382 // At the end of the run, the MDO, full of data, will be dumped. | |
383 } | |
384 } | |
385 } | |
386 | |
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387 void Method::cleanup_inline_caches() { |
0 | 388 // The current system doesn't use inline caches in the interpreter |
389 // => nothing to do (keep this method around for future use) | |
390 } | |
391 | |
392 | |
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393 int Method::extra_stack_words() { |
710 | 394 // not an inline function, to avoid a header dependency on Interpreter |
1506 | 395 return extra_stack_entries() * Interpreter::stackElementSize; |
710 | 396 } |
397 | |
398 | |
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399 void Method::compute_size_of_parameters(Thread *thread) { |
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400 ArgumentSizeComputer asc(signature()); |
0 | 401 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); |
402 } | |
403 | |
404 #ifdef CC_INTERP | |
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405 void Method::set_result_index(BasicType type) { |
0 | 406 _result_index = Interpreter::BasicType_as_index(type); |
407 } | |
408 #endif | |
409 | |
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410 BasicType Method::result_type() const { |
0 | 411 ResultTypeFinder rtf(signature()); |
412 return rtf.type(); | |
413 } | |
414 | |
415 | |
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416 bool Method::is_empty_method() const { |
0 | 417 return code_size() == 1 |
418 && *code_base() == Bytecodes::_return; | |
419 } | |
420 | |
421 | |
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422 bool Method::is_vanilla_constructor() const { |
0 | 423 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method |
424 // which only calls the superclass vanilla constructor and possibly does stores of | |
425 // zero constants to local fields: | |
426 // | |
427 // aload_0 | |
428 // invokespecial | |
429 // indexbyte1 | |
430 // indexbyte2 | |
431 // | |
432 // followed by an (optional) sequence of: | |
433 // | |
434 // aload_0 | |
435 // aconst_null / iconst_0 / fconst_0 / dconst_0 | |
436 // putfield | |
437 // indexbyte1 | |
438 // indexbyte2 | |
439 // | |
440 // followed by: | |
441 // | |
442 // return | |
443 | |
444 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); | |
445 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); | |
446 int size = code_size(); | |
447 // Check if size match | |
448 if (size == 0 || size % 5 != 0) return false; | |
449 address cb = code_base(); | |
450 int last = size - 1; | |
451 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { | |
452 // Does not call superclass default constructor | |
453 return false; | |
454 } | |
455 // Check optional sequence | |
456 for (int i = 4; i < last; i += 5) { | |
457 if (cb[i] != Bytecodes::_aload_0) return false; | |
458 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; | |
459 if (cb[i+2] != Bytecodes::_putfield) return false; | |
460 } | |
461 return true; | |
462 } | |
463 | |
464 | |
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465 bool Method::compute_has_loops_flag() { |
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466 BytecodeStream bcs(this); |
0 | 467 Bytecodes::Code bc; |
468 | |
469 while ((bc = bcs.next()) >= 0) { | |
470 switch( bc ) { | |
471 case Bytecodes::_ifeq: | |
472 case Bytecodes::_ifnull: | |
473 case Bytecodes::_iflt: | |
474 case Bytecodes::_ifle: | |
475 case Bytecodes::_ifne: | |
476 case Bytecodes::_ifnonnull: | |
477 case Bytecodes::_ifgt: | |
478 case Bytecodes::_ifge: | |
479 case Bytecodes::_if_icmpeq: | |
480 case Bytecodes::_if_icmpne: | |
481 case Bytecodes::_if_icmplt: | |
482 case Bytecodes::_if_icmpgt: | |
483 case Bytecodes::_if_icmple: | |
484 case Bytecodes::_if_icmpge: | |
485 case Bytecodes::_if_acmpeq: | |
486 case Bytecodes::_if_acmpne: | |
487 case Bytecodes::_goto: | |
488 case Bytecodes::_jsr: | |
489 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
490 break; | |
491 | |
492 case Bytecodes::_goto_w: | |
493 case Bytecodes::_jsr_w: | |
494 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
495 break; | |
496 } | |
497 } | |
498 _access_flags.set_loops_flag_init(); | |
499 return _access_flags.has_loops(); | |
500 } | |
501 | |
502 | |
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503 bool Method::is_final_method() const { |
0 | 504 // %%% Should return true for private methods also, |
505 // since there is no way to override them. | |
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506 return is_final() || method_holder()->is_final(); |
0 | 507 } |
508 | |
509 | |
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510 bool Method::is_strict_method() const { |
0 | 511 return is_strict(); |
512 } | |
513 | |
514 | |
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515 bool Method::can_be_statically_bound() const { |
0 | 516 if (is_final_method()) return true; |
517 return vtable_index() == nonvirtual_vtable_index; | |
518 } | |
519 | |
520 | |
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521 bool Method::is_accessor() const { |
0 | 522 if (code_size() != 5) return false; |
523 if (size_of_parameters() != 1) return false; | |
2142 | 524 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; |
525 if (java_code_at(1) != Bytecodes::_getfield) return false; | |
526 if (java_code_at(4) != Bytecodes::_areturn && | |
527 java_code_at(4) != Bytecodes::_ireturn ) return false; | |
0 | 528 return true; |
529 } | |
530 | |
531 | |
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532 bool Method::is_initializer() const { |
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533 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); |
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534 } |
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535 |
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536 bool Method::has_valid_initializer_flags() const { |
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537 return (is_static() || |
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538 method_holder()->major_version() < 51); |
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539 } |
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540 |
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541 bool Method::is_static_initializer() const { |
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542 // For classfiles version 51 or greater, ensure that the clinit method is |
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543 // static. Non-static methods with the name "<clinit>" are not static |
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544 // initializers. (older classfiles exempted for backward compatibility) |
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545 return name() == vmSymbols::class_initializer_name() && |
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546 has_valid_initializer_flags(); |
0 | 547 } |
548 | |
549 | |
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550 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { |
0 | 551 int length = this_oop->checked_exceptions_length(); |
552 if (length == 0) { // common case | |
553 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); | |
554 } else { | |
555 methodHandle h_this(THREAD, this_oop); | |
1142 | 556 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); |
0 | 557 objArrayHandle mirrors (THREAD, m_oop); |
558 for (int i = 0; i < length; i++) { | |
559 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe | |
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560 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); |
6983 | 561 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); |
562 mirrors->obj_at_put(i, k->java_mirror()); | |
0 | 563 } |
564 return mirrors; | |
565 } | |
566 }; | |
567 | |
568 | |
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569 int Method::line_number_from_bci(int bci) const { |
0 | 570 if (bci == SynchronizationEntryBCI) bci = 0; |
571 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); | |
572 int best_bci = 0; | |
573 int best_line = -1; | |
574 | |
575 if (has_linenumber_table()) { | |
576 // The line numbers are a short array of 2-tuples [start_pc, line_number]. | |
577 // Not necessarily sorted and not necessarily one-to-one. | |
578 CompressedLineNumberReadStream stream(compressed_linenumber_table()); | |
579 while (stream.read_pair()) { | |
580 if (stream.bci() == bci) { | |
581 // perfect match | |
582 return stream.line(); | |
583 } else { | |
584 // update best_bci/line | |
585 if (stream.bci() < bci && stream.bci() >= best_bci) { | |
586 best_bci = stream.bci(); | |
587 best_line = stream.line(); | |
588 } | |
589 } | |
590 } | |
591 } | |
592 return best_line; | |
593 } | |
594 | |
595 | |
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596 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { |
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597 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { |
0 | 598 Thread *thread = Thread::current(); |
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599 Symbol* klass_name = constants()->klass_name_at(klass_index); |
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600 Handle loader(thread, method_holder()->class_loader()); |
6983 | 601 Handle prot (thread, method_holder()->protection_domain()); |
0 | 602 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; |
603 } else { | |
604 return true; | |
605 } | |
606 } | |
607 | |
608 | |
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609 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { |
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610 int klass_index = constants()->klass_ref_index_at(refinfo_index); |
0 | 611 if (must_be_resolved) { |
612 // Make sure klass is resolved in constantpool. | |
613 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; | |
614 } | |
615 return is_klass_loaded_by_klass_index(klass_index); | |
616 } | |
617 | |
618 | |
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619 void Method::set_native_function(address function, bool post_event_flag) { |
0 | 620 assert(function != NULL, "use clear_native_function to unregister natives"); |
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621 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); |
0 | 622 address* native_function = native_function_addr(); |
623 | |
624 // We can see racers trying to place the same native function into place. Once | |
625 // is plenty. | |
626 address current = *native_function; | |
627 if (current == function) return; | |
628 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && | |
629 function != NULL) { | |
630 // native_method_throw_unsatisfied_link_error_entry() should only | |
631 // be passed when post_event_flag is false. | |
632 assert(function != | |
633 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
634 "post_event_flag mis-match"); | |
635 | |
636 // post the bind event, and possible change the bind function | |
637 JvmtiExport::post_native_method_bind(this, &function); | |
638 } | |
639 *native_function = function; | |
640 // This function can be called more than once. We must make sure that we always | |
641 // use the latest registered method -> check if a stub already has been generated. | |
642 // If so, we have to make it not_entrant. | |
643 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates | |
644 if (nm != NULL) { | |
645 nm->make_not_entrant(); | |
646 } | |
647 } | |
648 | |
649 | |
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650 bool Method::has_native_function() const { |
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651 if (is_method_handle_intrinsic()) |
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652 return false; // special-cased in SharedRuntime::generate_native_wrapper |
0 | 653 address func = native_function(); |
654 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); | |
655 } | |
656 | |
657 | |
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658 void Method::clear_native_function() { |
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659 // Note: is_method_handle_intrinsic() is allowed here. |
0 | 660 set_native_function( |
661 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
662 !native_bind_event_is_interesting); | |
663 clear_code(); | |
664 } | |
665 | |
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666 address Method::critical_native_function() { |
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667 methodHandle mh(this); |
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668 return NativeLookup::lookup_critical_entry(mh); |
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669 } |
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670 |
0 | 671 |
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672 void Method::set_signature_handler(address handler) { |
0 | 673 address* signature_handler = signature_handler_addr(); |
674 *signature_handler = handler; | |
675 } | |
676 | |
677 | |
7998 | 678 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { |
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679 if (PrintCompilation && report) { |
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680 ttyLocker ttyl; |
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681 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); |
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682 if (comp_level == CompLevel_all) { |
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683 tty->print("all levels "); |
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684 } else { |
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685 tty->print("levels "); |
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686 for (int i = (int)CompLevel_none; i <= comp_level; i++) { |
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687 tty->print("%d ", i); |
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688 } |
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689 } |
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690 this->print_short_name(tty); |
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691 int size = this->code_size(); |
7998 | 692 if (size > 0) { |
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693 tty->print(" (%d bytes)", size); |
7998 | 694 } |
695 if (reason != NULL) { | |
696 tty->print(" %s", reason); | |
697 } | |
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698 tty->cr(); |
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699 } |
0 | 700 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { |
701 ttyLocker ttyl; | |
6843 | 702 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", |
703 is_osr ? "osr_" : "", os::current_thread_id()); | |
7998 | 704 if (reason != NULL) { |
705 xtty->print(" reason=\'%s\'", reason); | |
706 } | |
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707 xtty->method(this); |
0 | 708 xtty->stamp(); |
709 xtty->end_elem(); | |
710 } | |
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711 } |
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712 |
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713 bool Method::is_not_compilable(int comp_level) const { |
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714 if (number_of_breakpoints() > 0) |
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715 return true; |
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716 if (is_method_handle_intrinsic()) |
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717 return !is_synthetic(); // the generated adapters must be compiled |
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718 if (comp_level == CompLevel_any) |
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719 return is_not_c1_compilable() || is_not_c2_compilable(); |
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720 if (is_c1_compile(comp_level)) |
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721 return is_not_c1_compilable(); |
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722 if (is_c2_compile(comp_level)) |
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723 return is_not_c2_compilable(); |
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724 return false; |
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725 } |
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726 |
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727 // call this when compiler finds that this method is not compilable |
7998 | 728 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { |
729 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); | |
1783 | 730 if (comp_level == CompLevel_all) { |
731 set_not_c1_compilable(); | |
732 set_not_c2_compilable(); | |
733 } else { | |
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734 if (is_c1_compile(comp_level)) |
1783 | 735 set_not_c1_compilable(); |
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736 if (is_c2_compile(comp_level)) |
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737 set_not_c2_compilable(); |
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738 } |
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739 CompilationPolicy::policy()->disable_compilation(this); |
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740 } |
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741 |
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742 bool Method::is_not_osr_compilable(int comp_level) const { |
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743 if (is_not_compilable(comp_level)) |
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744 return true; |
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745 if (comp_level == CompLevel_any) |
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746 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); |
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747 if (is_c1_compile(comp_level)) |
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748 return is_not_c1_osr_compilable(); |
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749 if (is_c2_compile(comp_level)) |
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750 return is_not_c2_osr_compilable(); |
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751 return false; |
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752 } |
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753 |
7998 | 754 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { |
755 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); | |
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756 if (comp_level == CompLevel_all) { |
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757 set_not_c1_osr_compilable(); |
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758 set_not_c2_osr_compilable(); |
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759 } else { |
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760 if (is_c1_compile(comp_level)) |
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761 set_not_c1_osr_compilable(); |
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762 if (is_c2_compile(comp_level)) |
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763 set_not_c2_osr_compilable(); |
0 | 764 } |
1783 | 765 CompilationPolicy::policy()->disable_compilation(this); |
0 | 766 } |
767 | |
768 // Revert to using the interpreter and clear out the nmethod | |
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769 void Method::clear_code() { |
0 | 770 |
771 // this may be NULL if c2i adapters have not been made yet | |
772 // Only should happen at allocate time. | |
773 if (_adapter == NULL) { | |
774 _from_compiled_entry = NULL; | |
775 } else { | |
776 _from_compiled_entry = _adapter->get_c2i_entry(); | |
777 } | |
778 OrderAccess::storestore(); | |
779 _from_interpreted_entry = _i2i_entry; | |
780 OrderAccess::storestore(); | |
781 _code = NULL; | |
782 } | |
783 | |
784 // Called by class data sharing to remove any entry points (which are not shared) | |
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785 void Method::unlink_method() { |
0 | 786 _code = NULL; |
787 _i2i_entry = NULL; | |
788 _from_interpreted_entry = NULL; | |
789 if (is_native()) { | |
790 *native_function_addr() = NULL; | |
791 set_signature_handler(NULL); | |
792 } | |
793 NOT_PRODUCT(set_compiled_invocation_count(0);) | |
794 invocation_counter()->reset(); | |
795 backedge_counter()->reset(); | |
796 _adapter = NULL; | |
797 _from_compiled_entry = NULL; | |
798 assert(_method_data == NULL, "unexpected method data?"); | |
799 set_method_data(NULL); | |
800 set_interpreter_throwout_count(0); | |
801 set_interpreter_invocation_count(0); | |
802 } | |
803 | |
804 // Called when the method_holder is getting linked. Setup entrypoints so the method | |
805 // is ready to be called from interpreter, compiler, and vtables. | |
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806 void Method::link_method(methodHandle h_method, TRAPS) { |
3748 | 807 // If the code cache is full, we may reenter this function for the |
808 // leftover methods that weren't linked. | |
809 if (_i2i_entry != NULL) return; | |
810 | |
0 | 811 assert(_adapter == NULL, "init'd to NULL" ); |
812 assert( _code == NULL, "nothing compiled yet" ); | |
813 | |
814 // Setup interpreter entrypoint | |
815 assert(this == h_method(), "wrong h_method()" ); | |
816 address entry = Interpreter::entry_for_method(h_method); | |
817 assert(entry != NULL, "interpreter entry must be non-null"); | |
818 // Sets both _i2i_entry and _from_interpreted_entry | |
819 set_interpreter_entry(entry); | |
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820 if (is_native() && !is_method_handle_intrinsic()) { |
0 | 821 set_native_function( |
822 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
823 !native_bind_event_is_interesting); | |
824 } | |
825 | |
826 // Setup compiler entrypoint. This is made eagerly, so we do not need | |
827 // special handling of vtables. An alternative is to make adapters more | |
828 // lazily by calling make_adapter() from from_compiled_entry() for the | |
829 // normal calls. For vtable calls life gets more complicated. When a | |
830 // call-site goes mega-morphic we need adapters in all methods which can be | |
831 // called from the vtable. We need adapters on such methods that get loaded | |
832 // later. Ditto for mega-morphic itable calls. If this proves to be a | |
833 // problem we'll make these lazily later. | |
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834 (void) make_adapters(h_method, CHECK); |
0 | 835 |
836 // ONLY USE the h_method now as make_adapter may have blocked | |
837 | |
838 } | |
839 | |
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840 address Method::make_adapters(methodHandle mh, TRAPS) { |
0 | 841 // Adapters for compiled code are made eagerly here. They are fairly |
842 // small (generally < 100 bytes) and quick to make (and cached and shared) | |
843 // so making them eagerly shouldn't be too expensive. | |
844 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); | |
845 if (adapter == NULL ) { | |
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846 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); |
0 | 847 } |
848 | |
849 mh->set_adapter_entry(adapter); | |
850 mh->_from_compiled_entry = adapter->get_c2i_entry(); | |
851 return adapter->get_c2i_entry(); | |
852 } | |
853 | |
854 // The verified_code_entry() must be called when a invoke is resolved | |
855 // on this method. | |
856 | |
857 // It returns the compiled code entry point, after asserting not null. | |
858 // This function is called after potential safepoints so that nmethod | |
859 // or adapter that it points to is still live and valid. | |
860 // This function must not hit a safepoint! | |
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861 address Method::verified_code_entry() { |
0 | 862 debug_only(No_Safepoint_Verifier nsv;) |
1202 | 863 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); |
864 if (code == NULL && UseCodeCacheFlushing) { | |
865 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); | |
866 if (saved_code != NULL) { | |
867 methodHandle method(this); | |
868 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); | |
869 set_code( method, saved_code ); | |
870 } | |
871 } | |
872 | |
0 | 873 assert(_from_compiled_entry != NULL, "must be set"); |
874 return _from_compiled_entry; | |
875 } | |
876 | |
877 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all | |
878 // (could be racing a deopt). | |
879 // Not inline to avoid circular ref. | |
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880 bool Method::check_code() const { |
0 | 881 // cached in a register or local. There's a race on the value of the field. |
882 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); | |
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883 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); |
0 | 884 } |
885 | |
886 // Install compiled code. Instantly it can execute. | |
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887 void Method::set_code(methodHandle mh, nmethod *code) { |
0 | 888 assert( code, "use clear_code to remove code" ); |
889 assert( mh->check_code(), "" ); | |
890 | |
891 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); | |
892 | |
893 // These writes must happen in this order, because the interpreter will | |
894 // directly jump to from_interpreted_entry which jumps to an i2c adapter | |
895 // which jumps to _from_compiled_entry. | |
896 mh->_code = code; // Assign before allowing compiled code to exec | |
897 | |
898 int comp_level = code->comp_level(); | |
899 // In theory there could be a race here. In practice it is unlikely | |
900 // and not worth worrying about. | |
1783 | 901 if (comp_level > mh->highest_comp_level()) { |
902 mh->set_highest_comp_level(comp_level); | |
0 | 903 } |
904 | |
905 OrderAccess::storestore(); | |
1692 | 906 #ifdef SHARK |
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907 mh->_from_interpreted_entry = code->insts_begin(); |
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908 #else //!SHARK |
0 | 909 mh->_from_compiled_entry = code->verified_entry_point(); |
910 OrderAccess::storestore(); | |
911 // Instantly compiled code can execute. | |
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912 if (!mh->is_method_handle_intrinsic()) |
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913 mh->_from_interpreted_entry = mh->get_i2c_entry(); |
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914 #endif //!SHARK |
0 | 915 } |
916 | |
917 | |
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918 bool Method::is_overridden_in(Klass* k) const { |
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919 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 920 |
921 if (ik->is_interface()) return false; | |
922 | |
923 // If method is an interface, we skip it - except if it | |
924 // is a miranda method | |
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925 if (method_holder()->is_interface()) { |
0 | 926 // Check that method is not a miranda method |
927 if (ik->lookup_method(name(), signature()) == NULL) { | |
928 // No implementation exist - so miranda method | |
929 return false; | |
930 } | |
931 return true; | |
932 } | |
933 | |
934 assert(ik->is_subclass_of(method_holder()), "should be subklass"); | |
935 assert(ik->vtable() != NULL, "vtable should exist"); | |
936 if (vtable_index() == nonvirtual_vtable_index) { | |
937 return false; | |
938 } else { | |
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939 Method* vt_m = ik->method_at_vtable(vtable_index()); |
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940 return vt_m != this; |
0 | 941 } |
942 } | |
943 | |
944 | |
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945 // give advice about whether this Method* should be cached or not |
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946 bool Method::should_not_be_cached() const { |
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947 if (is_old()) { |
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948 // This method has been redefined. It is either EMCP or obsolete |
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949 // and we don't want to cache it because that would pin the method |
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950 // down and prevent it from being collectible if and when it |
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951 // finishes executing. |
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952 return true; |
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953 } |
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954 |
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955 // caching this method should be just fine |
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956 return false; |
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957 } |
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958 |
710 | 959 // Constant pool structure for invoke methods: |
960 enum { | |
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961 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. |
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962 _imcp_invoke_signature, // utf8: (variable Symbol*) |
710 | 963 _imcp_limit |
964 }; | |
965 | |
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966 // Test if this method is an MH adapter frame generated by Java code. |
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967 // Cf. java/lang/invoke/InvokerBytecodeGenerator |
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968 bool Method::is_compiled_lambda_form() const { |
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969 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; |
710 | 970 } |
971 | |
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972 // Test if this method is an internal MH primitive method. |
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973 bool Method::is_method_handle_intrinsic() const { |
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974 vmIntrinsics::ID iid = intrinsic_id(); |
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975 return (MethodHandles::is_signature_polymorphic(iid) && |
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976 MethodHandles::is_signature_polymorphic_intrinsic(iid)); |
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977 } |
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978 |
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979 bool Method::has_member_arg() const { |
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980 vmIntrinsics::ID iid = intrinsic_id(); |
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981 return (MethodHandles::is_signature_polymorphic(iid) && |
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982 MethodHandles::has_member_arg(iid)); |
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983 } |
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984 |
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985 // Make an instance of a signature-polymorphic internal MH primitive. |
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986 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, |
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987 Symbol* signature, |
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988 TRAPS) { |
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989 ResourceMark rm; |
710 | 990 methodHandle empty; |
991 | |
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992 KlassHandle holder = SystemDictionary::MethodHandle_klass(); |
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993 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); |
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994 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); |
710 | 995 if (TraceMethodHandles) { |
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996 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); |
710 | 997 } |
998 | |
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999 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) |
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1000 name->increment_refcount(); |
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1001 signature->increment_refcount(); |
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1002 |
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1003 int cp_length = _imcp_limit; |
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1004 ClassLoaderData* loader_data = holder->class_loader_data(); |
710 | 1005 constantPoolHandle cp; |
1006 { | |
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1007 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); |
710 | 1008 cp = constantPoolHandle(THREAD, cp_oop); |
1009 } | |
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1010 cp->set_pool_holder(InstanceKlass::cast(holder())); |
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1011 cp->symbol_at_put(_imcp_invoke_name, name); |
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1012 cp->symbol_at_put(_imcp_invoke_signature, signature); |
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1013 cp->set_has_preresolution(); |
710 | 1014 |
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1015 // decide on access bits: public or not? |
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1016 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); |
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1017 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); |
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1018 if (must_be_static) flags_bits |= JVM_ACC_STATIC; |
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1019 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); |
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1020 |
710 | 1021 methodHandle m; |
1022 { | |
8031 | 1023 InlineTableSizes sizes; |
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1024 Method* m_oop = Method::allocate(loader_data, 0, |
8031 | 1025 accessFlags_from(flags_bits), &sizes, |
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1026 ConstMethod::NORMAL, CHECK_(empty)); |
710 | 1027 m = methodHandle(THREAD, m_oop); |
1028 } | |
1029 m->set_constants(cp()); | |
1030 m->set_name_index(_imcp_invoke_name); | |
1031 m->set_signature_index(_imcp_invoke_signature); | |
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1032 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); |
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1033 assert(m->signature() == signature, ""); |
710 | 1034 #ifdef CC_INTERP |
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1035 ResultTypeFinder rtf(signature); |
710 | 1036 m->set_result_index(rtf.type()); |
1037 #endif | |
1038 m->compute_size_of_parameters(THREAD); | |
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1039 m->init_intrinsic_id(); |
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1040 assert(m->is_method_handle_intrinsic(), ""); |
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1041 #ifdef ASSERT |
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1042 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); |
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1043 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); |
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1044 assert(m->intrinsic_id() == iid, "correctly predicted iid"); |
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1045 #endif //ASSERT |
710 | 1046 |
1047 // Finally, set up its entry points. | |
1048 assert(m->can_be_statically_bound(), ""); | |
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1049 m->set_vtable_index(Method::nonvirtual_vtable_index); |
710 | 1050 m->link_method(m, CHECK_(empty)); |
1051 | |
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1052 if (TraceMethodHandles && (Verbose || WizardMode)) |
710 | 1053 m->print_on(tty); |
1054 | |
1055 return m; | |
1056 } | |
1057 | |
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1058 Klass* Method::check_non_bcp_klass(Klass* klass) { |
6983 | 1059 if (klass != NULL && klass->class_loader() != NULL) { |
1060 if (klass->oop_is_objArray()) | |
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1061 klass = ObjArrayKlass::cast(klass)->bottom_klass(); |
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1062 return klass; |
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1063 } |
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1064 return NULL; |
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1065 } |
710 | 1066 |
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1067 |
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1068 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, |
0 | 1069 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { |
1070 // Code below does not work for native methods - they should never get rewritten anyway | |
1071 assert(!m->is_native(), "cannot rewrite native methods"); | |
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1072 // Allocate new Method* |
0 | 1073 AccessFlags flags = m->access_flags(); |
8031 | 1074 |
1075 ConstMethod* cm = m->constMethod(); | |
1076 int checked_exceptions_len = cm->checked_exceptions_length(); | |
1077 int localvariable_len = cm->localvariable_table_length(); | |
1078 int exception_table_len = cm->exception_table_length(); | |
1079 int method_parameters_len = cm->method_parameters_length(); | |
1080 int method_annotations_len = cm->method_annotations_length(); | |
1081 int parameter_annotations_len = cm->parameter_annotations_length(); | |
1082 int type_annotations_len = cm->type_annotations_length(); | |
1083 int default_annotations_len = cm->default_annotations_length(); | |
1084 | |
1085 InlineTableSizes sizes( | |
1086 localvariable_len, | |
1087 new_compressed_linenumber_size, | |
1088 exception_table_len, | |
1089 checked_exceptions_len, | |
1090 method_parameters_len, | |
1091 cm->generic_signature_index(), | |
1092 method_annotations_len, | |
1093 parameter_annotations_len, | |
1094 type_annotations_len, | |
1095 default_annotations_len, | |
1096 0); | |
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1097 |
6934 | 1098 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); |
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1099 Method* newm_oop = Method::allocate(loader_data, |
6934 | 1100 new_code_length, |
1101 flags, | |
8031 | 1102 &sizes, |
6934 | 1103 m->method_type(), |
1104 CHECK_(methodHandle())); | |
0 | 1105 methodHandle newm (THREAD, newm_oop); |
1106 int new_method_size = newm->method_size(); | |
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1107 |
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1108 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* |
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1109 ConstMethod* newcm = newm->constMethod(); |
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1110 int new_const_method_size = newm->constMethod()->size(); |
2226
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1111 |
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1112 memcpy(newm(), m(), sizeof(Method)); |
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1113 |
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1114 // Create shallow copy of ConstMethod. |
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1115 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); |
2226
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1116 |
0 | 1117 // Reset correct method/const method, method size, and parameter info |
1118 newm->set_constMethod(newcm); | |
1119 newm->constMethod()->set_code_size(new_code_length); | |
1120 newm->constMethod()->set_constMethod_size(new_const_method_size); | |
1121 newm->set_method_size(new_method_size); | |
1122 assert(newm->code_size() == new_code_length, "check"); | |
1123 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); | |
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1124 assert(newm->exception_table_length() == exception_table_len, "check"); |
0 | 1125 assert(newm->localvariable_table_length() == localvariable_len, "check"); |
1126 // Copy new byte codes | |
1127 memcpy(newm->code_base(), new_code, new_code_length); | |
1128 // Copy line number table | |
1129 if (new_compressed_linenumber_size > 0) { | |
1130 memcpy(newm->compressed_linenumber_table(), | |
1131 new_compressed_linenumber_table, | |
1132 new_compressed_linenumber_size); | |
1133 } | |
1134 // Copy checked_exceptions | |
1135 if (checked_exceptions_len > 0) { | |
1136 memcpy(newm->checked_exceptions_start(), | |
1137 m->checked_exceptions_start(), | |
1138 checked_exceptions_len * sizeof(CheckedExceptionElement)); | |
1139 } | |
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1140 // Copy exception table |
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1141 if (exception_table_len > 0) { |
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1142 memcpy(newm->exception_table_start(), |
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1143 m->exception_table_start(), |
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1144 exception_table_len * sizeof(ExceptionTableElement)); |
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1145 } |
0 | 1146 // Copy local variable number table |
1147 if (localvariable_len > 0) { | |
1148 memcpy(newm->localvariable_table_start(), | |
1149 m->localvariable_table_start(), | |
1150 localvariable_len * sizeof(LocalVariableTableElement)); | |
1151 } | |
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1152 // Copy stackmap table |
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1153 if (m->has_stackmap_table()) { |
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1154 int code_attribute_length = m->stackmap_data()->length(); |
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1155 Array<u1>* stackmap_data = |
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1156 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); |
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1157 memcpy((void*)stackmap_data->adr_at(0), |
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1158 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); |
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1159 newm->set_stackmap_data(stackmap_data); |
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1160 } |
518
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1161 |
0 | 1162 return newm; |
1163 } | |
1164 | |
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1165 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { |
0 | 1166 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics |
1167 // because we are not loading from core libraries | |
6894 | 1168 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar |
1169 // which does not use the class default class loader so we check for its loader here | |
1170 if ((InstanceKlass::cast(holder)->class_loader() != NULL) && | |
1171 InstanceKlass::cast(holder)->class_loader()->klass()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) { | |
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1172 return vmSymbols::NO_SID; // regardless of name, no intrinsics here |
6894 | 1173 } |
0 | 1174 |
1175 // see if the klass name is well-known: | |
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1176 Symbol* klass_name = InstanceKlass::cast(holder)->name(); |
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1177 return vmSymbols::find_sid(klass_name); |
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1178 } |
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1179 |
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1180 void Method::init_intrinsic_id() { |
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1181 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); |
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1182 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); |
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1183 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); |
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1184 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); |
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1185 |
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1186 // the klass name is well-known: |
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1187 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); |
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1188 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); |
0 | 1189 |
1190 // ditto for method and signature: | |
1191 vmSymbols::SID name_id = vmSymbols::find_sid(name()); | |
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1192 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1193 && name_id == vmSymbols::NO_SID) |
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1194 return; |
0 | 1195 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); |
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1196 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1197 && sig_id == vmSymbols::NO_SID) return; |
0 | 1198 jshort flags = access_flags().as_short(); |
1199 | |
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1200 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
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1201 if (id != vmIntrinsics::_none) { |
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1202 set_intrinsic_id(id); |
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1203 return; |
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1204 } |
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1205 |
0 | 1206 // A few slightly irregular cases: |
1207 switch (klass_id) { | |
1208 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): | |
1209 // Second chance: check in regular Math. | |
1210 switch (name_id) { | |
1211 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): | |
1212 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): | |
1213 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): | |
1214 // pretend it is the corresponding method in the non-strict class: | |
1215 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); | |
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1216 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
0 | 1217 break; |
1218 } | |
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1219 break; |
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1220 |
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1221 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. |
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1222 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): |
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1223 if (!is_native()) break; |
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1224 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); |
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1225 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) |
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1226 id = vmIntrinsics::_none; |
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1227 break; |
0 | 1228 } |
1229 | |
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1230 if (id != vmIntrinsics::_none) { |
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1231 // Set up its iid. It is an alias method. |
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1232 set_intrinsic_id(id); |
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1233 return; |
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1234 } |
0 | 1235 } |
1236 | |
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1237 // These two methods are static since a GC may move the Method |
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1238 bool Method::load_signature_classes(methodHandle m, TRAPS) { |
6266
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1239 if (THREAD->is_Compiler_thread()) { |
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1240 // There is nothing useful this routine can do from within the Compile thread. |
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1241 // Hopefully, the signature contains only well-known classes. |
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1242 // We could scan for this and return true/false, but the caller won't care. |
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1243 return false; |
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1244 } |
0 | 1245 bool sig_is_loaded = true; |
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1246 Handle class_loader(THREAD, m->method_holder()->class_loader()); |
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1247 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); |
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1248 ResourceMark rm(THREAD); |
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1249 Symbol* signature = m->signature(); |
0 | 1250 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1251 if (ss.is_object()) { | |
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1252 Symbol* sym = ss.as_symbol(CHECK_(false)); |
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1253 Symbol* name = sym; |
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1254 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, |
0 | 1255 protection_domain, THREAD); |
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1256 // We are loading classes eagerly. If a ClassNotFoundException or |
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1257 // a LinkageError was generated, be sure to ignore it. |
0 | 1258 if (HAS_PENDING_EXCEPTION) { |
1142 | 1259 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || |
1260 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { | |
0 | 1261 CLEAR_PENDING_EXCEPTION; |
1262 } else { | |
1263 return false; | |
1264 } | |
1265 } | |
1266 if( klass == NULL) { sig_is_loaded = false; } | |
1267 } | |
1268 } | |
1269 return sig_is_loaded; | |
1270 } | |
1271 | |
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1272 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { |
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1273 Handle class_loader(THREAD, m->method_holder()->class_loader()); |
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1274 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); |
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1275 ResourceMark rm(THREAD); |
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1276 Symbol* signature = m->signature(); |
0 | 1277 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1278 if (ss.type() == T_OBJECT) { | |
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1279 Symbol* name = ss.as_symbol_or_null(); |
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1280 if (name == NULL) return true; |
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1281 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); |
0 | 1282 if (klass == NULL) return true; |
1283 } | |
1284 } | |
1285 return false; | |
1286 } | |
1287 | |
1288 // Exposed so field engineers can debug VM | |
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1289 void Method::print_short_name(outputStream* st) { |
0 | 1290 ResourceMark rm; |
1291 #ifdef PRODUCT | |
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1292 st->print(" %s::", method_holder()->external_name()); |
0 | 1293 #else |
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1294 st->print(" %s::", method_holder()->internal_name()); |
0 | 1295 #endif |
1296 name()->print_symbol_on(st); | |
1297 if (WizardMode) signature()->print_symbol_on(st); | |
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1298 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) |
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1299 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); |
0 | 1300 } |
1301 | |
3779 | 1302 // Comparer for sorting an object array containing |
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1303 // Method*s. |
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1304 static int method_comparator(Method* a, Method* b) { |
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1305 return a->name()->fast_compare(b->name()); |
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1306 } |
0 | 1307 |
1308 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
8031 | 1309 void Method::sort_methods(Array<Method*>* methods, bool idempotent) { |
0 | 1310 int length = methods->length(); |
1311 if (length > 1) { | |
3779 | 1312 { |
1313 No_Safepoint_Verifier nsv; | |
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1314 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); |
0 | 1315 } |
1316 // Reset method ordering | |
1317 for (int i = 0; i < length; i++) { | |
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1318 Method* m = methods->at(i); |
0 | 1319 m->set_method_idnum(i); |
1320 } | |
1321 } | |
1322 } | |
1323 | |
1324 | |
1325 //----------------------------------------------------------------------------------- | |
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1326 // Non-product code unless JVM/TI needs it |
0 | 1327 |
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1328 #if !defined(PRODUCT) || INCLUDE_JVMTI |
0 | 1329 class SignatureTypePrinter : public SignatureTypeNames { |
1330 private: | |
1331 outputStream* _st; | |
1332 bool _use_separator; | |
1333 | |
1334 void type_name(const char* name) { | |
1335 if (_use_separator) _st->print(", "); | |
1336 _st->print(name); | |
1337 _use_separator = true; | |
1338 } | |
1339 | |
1340 public: | |
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1341 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { |
0 | 1342 _st = st; |
1343 _use_separator = false; | |
1344 } | |
1345 | |
1346 void print_parameters() { _use_separator = false; iterate_parameters(); } | |
1347 void print_returntype() { _use_separator = false; iterate_returntype(); } | |
1348 }; | |
1349 | |
1350 | |
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1351 void Method::print_name(outputStream* st) { |
0 | 1352 Thread *thread = Thread::current(); |
1353 ResourceMark rm(thread); | |
1354 SignatureTypePrinter sig(signature(), st); | |
1355 st->print("%s ", is_static() ? "static" : "virtual"); | |
1356 sig.print_returntype(); | |
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1357 st->print(" %s.", method_holder()->internal_name()); |
0 | 1358 name()->print_symbol_on(st); |
1359 st->print("("); | |
1360 sig.print_parameters(); | |
1361 st->print(")"); | |
1362 } | |
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1363 #endif // !PRODUCT || INCLUDE_JVMTI |
0 | 1364 |
1365 | |
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1366 //----------------------------------------------------------------------------------- |
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1367 // Non-product code |
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1368 |
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1369 #ifndef PRODUCT |
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1370 void Method::print_codes_on(outputStream* st) const { |
0 | 1371 print_codes_on(0, code_size(), st); |
1372 } | |
1373 | |
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1374 void Method::print_codes_on(int from, int to, outputStream* st) const { |
0 | 1375 Thread *thread = Thread::current(); |
1376 ResourceMark rm(thread); | |
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1377 methodHandle mh (thread, (Method*)this); |
0 | 1378 BytecodeStream s(mh); |
1379 s.set_interval(from, to); | |
1380 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); | |
1381 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); | |
1382 } | |
1383 #endif // not PRODUCT | |
1384 | |
1385 | |
1386 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas | |
1387 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) | |
1388 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used | |
1389 // as end-of-stream terminator. | |
1390 | |
1391 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { | |
1392 // bci and line number does not compress into single byte. | |
1393 // Write out escape character and use regular compression for bci and line number. | |
1394 write_byte((jubyte)0xFF); | |
1395 write_signed_int(bci_delta); | |
1396 write_signed_int(line_delta); | |
1397 } | |
1398 | |
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1399 // See comment in method.hpp which explains why this exists. |
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1400 #if defined(_M_AMD64) && _MSC_VER >= 1400 |
0 | 1401 #pragma optimize("", off) |
1402 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { | |
1403 write_pair_inline(bci, line); | |
1404 } | |
1405 #pragma optimize("", on) | |
1406 #endif | |
1407 | |
1408 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { | |
1409 _bci = 0; | |
1410 _line = 0; | |
1411 }; | |
1412 | |
1413 | |
1414 bool CompressedLineNumberReadStream::read_pair() { | |
1415 jubyte next = read_byte(); | |
1416 // Check for terminator | |
1417 if (next == 0) return false; | |
1418 if (next == 0xFF) { | |
1419 // Escape character, regular compression used | |
1420 _bci += read_signed_int(); | |
1421 _line += read_signed_int(); | |
1422 } else { | |
1423 // Single byte compression used | |
1424 _bci += next >> 3; | |
1425 _line += next & 0x7; | |
1426 } | |
1427 return true; | |
1428 } | |
1429 | |
1430 | |
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1431 Bytecodes::Code Method::orig_bytecode_at(int bci) const { |
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1432 BreakpointInfo* bp = method_holder()->breakpoints(); |
0 | 1433 for (; bp != NULL; bp = bp->next()) { |
1434 if (bp->match(this, bci)) { | |
1435 return bp->orig_bytecode(); | |
1436 } | |
1437 } | |
1438 ShouldNotReachHere(); | |
1439 return Bytecodes::_shouldnotreachhere; | |
1440 } | |
1441 | |
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1442 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { |
0 | 1443 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); |
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1444 BreakpointInfo* bp = method_holder()->breakpoints(); |
0 | 1445 for (; bp != NULL; bp = bp->next()) { |
1446 if (bp->match(this, bci)) { | |
1447 bp->set_orig_bytecode(code); | |
1448 // and continue, in case there is more than one | |
1449 } | |
1450 } | |
1451 } | |
1452 | |
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1453 void Method::set_breakpoint(int bci) { |
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1454 InstanceKlass* ik = method_holder(); |
0 | 1455 BreakpointInfo *bp = new BreakpointInfo(this, bci); |
1456 bp->set_next(ik->breakpoints()); | |
1457 ik->set_breakpoints(bp); | |
1458 // do this last: | |
1459 bp->set(this); | |
1460 } | |
1461 | |
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1462 static void clear_matches(Method* m, int bci) { |
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1463 InstanceKlass* ik = m->method_holder(); |
0 | 1464 BreakpointInfo* prev_bp = NULL; |
1465 BreakpointInfo* next_bp; | |
1466 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { | |
1467 next_bp = bp->next(); | |
1468 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). | |
1469 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { | |
1470 // do this first: | |
1471 bp->clear(m); | |
1472 // unhook it | |
1473 if (prev_bp != NULL) | |
1474 prev_bp->set_next(next_bp); | |
1475 else | |
1476 ik->set_breakpoints(next_bp); | |
1477 delete bp; | |
1478 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods | |
1479 // at same location. So we have multiple matching (method_index and bci) | |
1480 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one | |
1481 // breakpoint for clear_breakpoint request and keep all other method versions | |
1482 // BreakpointInfo for future clear_breakpoint request. | |
1483 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) | |
1484 // which is being called when class is unloaded. We delete all the Breakpoint | |
1485 // information for all versions of method. We may not correctly restore the original | |
1486 // bytecode in all method versions, but that is ok. Because the class is being unloaded | |
1487 // so these methods won't be used anymore. | |
1488 if (bci >= 0) { | |
1489 break; | |
1490 } | |
1491 } else { | |
1492 // This one is a keeper. | |
1493 prev_bp = bp; | |
1494 } | |
1495 } | |
1496 } | |
1497 | |
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1498 void Method::clear_breakpoint(int bci) { |
0 | 1499 assert(bci >= 0, ""); |
1500 clear_matches(this, bci); | |
1501 } | |
1502 | |
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1503 void Method::clear_all_breakpoints() { |
0 | 1504 clear_matches(this, -1); |
1505 } | |
1506 | |
1507 | |
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1508 int Method::invocation_count() { |
1783 | 1509 if (TieredCompilation) { |
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1510 MethodData* const mdo = method_data(); |
1783 | 1511 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { |
1512 return InvocationCounter::count_limit; | |
1513 } else { | |
1514 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); | |
1515 } | |
1516 } else { | |
1517 return invocation_counter()->count(); | |
1518 } | |
1519 } | |
1520 | |
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1521 int Method::backedge_count() { |
1783 | 1522 if (TieredCompilation) { |
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1523 MethodData* const mdo = method_data(); |
1783 | 1524 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { |
1525 return InvocationCounter::count_limit; | |
1526 } else { | |
1527 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); | |
1528 } | |
1529 } else { | |
1530 return backedge_counter()->count(); | |
1531 } | |
1532 } | |
1533 | |
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1534 int Method::highest_comp_level() const { |
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1535 MethodData* mdo = method_data(); |
1783 | 1536 if (mdo != NULL) { |
1537 return mdo->highest_comp_level(); | |
1538 } else { | |
1539 return CompLevel_none; | |
1540 } | |
1541 } | |
1542 | |
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1543 int Method::highest_osr_comp_level() const { |
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1544 MethodData* mdo = method_data(); |
1783 | 1545 if (mdo != NULL) { |
1546 return mdo->highest_osr_comp_level(); | |
1547 } else { | |
1548 return CompLevel_none; | |
1549 } | |
1550 } | |
1551 | |
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1552 void Method::set_highest_comp_level(int level) { |
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1553 MethodData* mdo = method_data(); |
1783 | 1554 if (mdo != NULL) { |
1555 mdo->set_highest_comp_level(level); | |
1556 } | |
1557 } | |
1558 | |
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1559 void Method::set_highest_osr_comp_level(int level) { |
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1560 MethodData* mdo = method_data(); |
1783 | 1561 if (mdo != NULL) { |
1562 mdo->set_highest_osr_comp_level(level); | |
1563 } | |
1564 } | |
1565 | |
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1566 BreakpointInfo::BreakpointInfo(Method* m, int bci) { |
0 | 1567 _bci = bci; |
1568 _name_index = m->name_index(); | |
1569 _signature_index = m->signature_index(); | |
1570 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); | |
1571 if (_orig_bytecode == Bytecodes::_breakpoint) | |
1572 _orig_bytecode = m->orig_bytecode_at(_bci); | |
1573 _next = NULL; | |
1574 } | |
1575 | |
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1576 void BreakpointInfo::set(Method* method) { |
0 | 1577 #ifdef ASSERT |
1578 { | |
1579 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); | |
1580 if (code == Bytecodes::_breakpoint) | |
1581 code = method->orig_bytecode_at(_bci); | |
1582 assert(orig_bytecode() == code, "original bytecode must be the same"); | |
1583 } | |
1584 #endif | |
1585 *method->bcp_from(_bci) = Bytecodes::_breakpoint; | |
1586 method->incr_number_of_breakpoints(); | |
1587 SystemDictionary::notice_modification(); | |
1588 { | |
1589 // Deoptimize all dependents on this method | |
1590 Thread *thread = Thread::current(); | |
1591 HandleMark hm(thread); | |
1592 methodHandle mh(thread, method); | |
1593 Universe::flush_dependents_on_method(mh); | |
1594 } | |
1595 } | |
1596 | |
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1597 void BreakpointInfo::clear(Method* method) { |
0 | 1598 *method->bcp_from(_bci) = orig_bytecode(); |
1599 assert(method->number_of_breakpoints() > 0, "must not go negative"); | |
1600 method->decr_number_of_breakpoints(); | |
1601 } | |
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1602 |
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1603 // jmethodID handling |
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1604 |
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1605 // This is a block allocating object, sort of like JNIHandleBlock, only a |
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1606 // lot simpler. There aren't many of these, they aren't long, they are rarely |
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1607 // deleted and so we can do some suboptimal things. |
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1608 // It's allocated on the CHeap because once we allocate a jmethodID, we can |
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1609 // never get rid of it. |
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1610 // It would be nice to be able to parameterize the number of methods for |
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1611 // the null_class_loader but then we'd have to turn this and ClassLoaderData |
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1612 // into templates. |
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1613 |
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1614 // I feel like this brain dead class should exist somewhere in the STL |
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1615 |
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1616 class JNIMethodBlock : public CHeapObj<mtClass> { |
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1617 enum { number_of_methods = 8 }; |
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1618 |
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1619 Method* _methods[number_of_methods]; |
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1620 int _top; |
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1621 JNIMethodBlock* _next; |
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1622 public: |
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1623 static Method* const _free_method; |
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1624 |
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1625 JNIMethodBlock() : _next(NULL), _top(0) { |
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1626 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; |
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1627 } |
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1628 |
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1629 Method** add_method(Method* m) { |
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1630 if (_top < number_of_methods) { |
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1631 // top points to the next free entry. |
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1632 int i = _top; |
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1633 _methods[i] = m; |
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1634 _top++; |
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1635 return &_methods[i]; |
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1636 } else if (_top == number_of_methods) { |
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1637 // if the next free entry ran off the block see if there's a free entry |
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1638 for (int i = 0; i< number_of_methods; i++) { |
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1639 if (_methods[i] == _free_method) { |
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1640 _methods[i] = m; |
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1641 return &_methods[i]; |
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1642 } |
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1643 } |
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1644 // Only check each block once for frees. They're very unlikely. |
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1645 // Increment top past the end of the block. |
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1646 _top++; |
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1647 } |
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1648 // need to allocate a next block. |
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1649 if (_next == NULL) { |
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1650 _next = new JNIMethodBlock(); |
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1651 } |
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1652 return _next->add_method(m); |
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1653 } |
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1654 |
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1655 bool contains(Method** m) { |
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1656 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1657 for (int i = 0; i< number_of_methods; i++) { |
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1658 if (&(b->_methods[i]) == m) { |
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1659 return true; |
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1660 } |
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1661 } |
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1662 } |
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1663 return false; // not found |
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1664 } |
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1665 |
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1666 // Doesn't really destroy it, just marks it as free so it can be reused. |
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1667 void destroy_method(Method** m) { |
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1668 #ifdef ASSERT |
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1669 assert(contains(m), "should be a methodID"); |
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1670 #endif // ASSERT |
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1671 *m = _free_method; |
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1672 } |
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1673 |
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1674 // During class unloading the methods are cleared, which is different |
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1675 // than freed. |
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1676 void clear_all_methods() { |
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1677 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1678 for (int i = 0; i< number_of_methods; i++) { |
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1679 _methods[i] = NULL; |
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1680 } |
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1681 } |
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1682 } |
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1683 #ifndef PRODUCT |
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1684 int count_methods() { |
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1685 // count all allocated methods |
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1686 int count = 0; |
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1687 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1688 for (int i = 0; i< number_of_methods; i++) { |
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1689 if (_methods[i] != _free_method) count++; |
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1690 } |
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1691 } |
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1692 return count; |
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1693 } |
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1694 #endif // PRODUCT |
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1695 }; |
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1696 |
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1697 // Something that can't be mistaken for an address or a markOop |
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1698 Method* const JNIMethodBlock::_free_method = (Method*)55; |
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1699 |
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1700 // Add a method id to the jmethod_ids |
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1701 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { |
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1702 ClassLoaderData* cld = loader_data; |
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1703 |
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1704 if (!SafepointSynchronize::is_at_safepoint()) { |
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1705 // Have to add jmethod_ids() to class loader data thread-safely. |
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1706 // Also have to add the method to the list safely, which the cld lock |
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1707 // protects as well. |
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1708 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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1709 if (cld->jmethod_ids() == NULL) { |
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1710 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1711 } |
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1712 // jmethodID is a pointer to Method* |
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1713 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1714 } else { |
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1715 // At safepoint, we are single threaded and can set this. |
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1716 if (cld->jmethod_ids() == NULL) { |
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1717 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1718 } |
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1719 // jmethodID is a pointer to Method* |
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1720 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1721 } |
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1722 } |
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1723 |
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1724 // Mark a jmethodID as free. This is called when there is a data race in |
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1725 // InstanceKlass while creating the jmethodID cache. |
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1726 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { |
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1727 ClassLoaderData* cld = loader_data; |
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1728 Method** ptr = (Method**)m; |
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1729 assert(cld->jmethod_ids() != NULL, "should have method handles"); |
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1730 cld->jmethod_ids()->destroy_method(ptr); |
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1731 } |
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1732 |
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1733 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { |
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1734 // Can't assert the method_holder is the same because the new method has the |
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1735 // scratch method holder. |
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1736 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() |
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1737 == new_method->method_holder()->class_loader(), |
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1738 "changing to a different class loader"); |
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1739 // Just change the method in place, jmethodID pointer doesn't change. |
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1740 *((Method**)jmid) = new_method; |
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1741 } |
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1742 |
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1743 bool Method::is_method_id(jmethodID mid) { |
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1744 Method* m = resolve_jmethod_id(mid); |
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1745 assert(m != NULL, "should be called with non-null method"); |
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1746 InstanceKlass* ik = m->method_holder(); |
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1747 ClassLoaderData* cld = ik->class_loader_data(); |
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1748 if (cld->jmethod_ids() == NULL) return false; |
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1749 return (cld->jmethod_ids()->contains((Method**)mid)); |
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1750 } |
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1751 |
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1752 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { |
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1753 if (mid == NULL) return NULL; |
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1754 Method* o = resolve_jmethod_id(mid); |
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1755 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { |
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1756 return NULL; |
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1757 } |
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1758 return o; |
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1759 }; |
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1760 |
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1761 void Method::set_on_stack(const bool value) { |
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1762 // Set both the method itself and its constant pool. The constant pool |
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1763 // on stack means some method referring to it is also on the stack. |
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1764 _access_flags.set_on_stack(value); |
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1765 constants()->set_on_stack(value); |
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1766 if (value) MetadataOnStackMark::record(this); |
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1767 } |
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1768 |
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1769 // Called when the class loader is unloaded to make all methods weak. |
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1770 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { |
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1771 loader_data->jmethod_ids()->clear_all_methods(); |
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1772 } |
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1773 |
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1774 |
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1775 // Check that this pointer is valid by checking that the vtbl pointer matches |
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1776 bool Method::is_valid_method() const { |
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1777 if (this == NULL) { |
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1778 return false; |
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1779 } else if (!is_metaspace_object()) { |
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1780 return false; |
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1781 } else { |
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1782 Method m; |
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1783 // This assumes that the vtbl pointer is the first word of a C++ object. |
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1784 // This assumption is also in universe.cpp patch_klass_vtble |
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1785 void* vtbl2 = dereference_vptr((void*)&m); |
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1786 void* this_vtbl = dereference_vptr((void*)this); |
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1787 return vtbl2 == this_vtbl; |
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1788 } |
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1789 } |
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1790 |
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1791 #ifndef PRODUCT |
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1792 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { |
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1793 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); |
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1794 } |
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1795 #endif // PRODUCT |
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1796 |
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1797 |
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1798 // Printing |
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1799 |
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1800 #ifndef PRODUCT |
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1801 |
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1802 void Method::print_on(outputStream* st) const { |
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1803 ResourceMark rm; |
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1804 assert(is_method(), "must be method"); |
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1805 st->print_cr(internal_name()); |
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1806 // get the effect of PrintOopAddress, always, for methods: |
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1807 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); |
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1808 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); |
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1809 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); |
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1810 constants()->print_value_on(st); st->cr(); |
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1811 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); |
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1812 st->print (" - name: "); name()->print_value_on(st); st->cr(); |
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1813 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); |
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1814 st->print_cr(" - max stack: %d", max_stack()); |
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1815 st->print_cr(" - max locals: %d", max_locals()); |
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1816 st->print_cr(" - size of params: %d", size_of_parameters()); |
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1817 st->print_cr(" - method size: %d", method_size()); |
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1818 if (intrinsic_id() != vmIntrinsics::_none) |
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1819 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); |
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1820 if (highest_comp_level() != CompLevel_none) |
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1821 st->print_cr(" - highest level: %d", highest_comp_level()); |
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1822 st->print_cr(" - vtable index: %d", _vtable_index); |
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1823 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); |
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1824 st->print( " - adapters: "); |
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1825 AdapterHandlerEntry* a = ((Method*)this)->adapter(); |
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1826 if (a == NULL) |
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1827 st->print_cr(INTPTR_FORMAT, a); |
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1828 else |
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1829 a->print_adapter_on(st); |
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1830 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); |
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1831 st->print_cr(" - code size: %d", code_size()); |
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1832 if (code_size() != 0) { |
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1833 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); |
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1834 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); |
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1835 } |
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1836 if (method_data() != NULL) { |
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1837 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); |
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1838 } |
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1839 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); |
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1840 if (checked_exceptions_length() > 0) { |
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1841 CheckedExceptionElement* table = checked_exceptions_start(); |
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1842 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); |
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1843 if (Verbose) { |
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1844 for (int i = 0; i < checked_exceptions_length(); i++) { |
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1845 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); |
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1846 } |
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1847 } |
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1848 } |
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1849 if (has_linenumber_table()) { |
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1850 u_char* table = compressed_linenumber_table(); |
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1851 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); |
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1852 if (Verbose) { |
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1853 CompressedLineNumberReadStream stream(table); |
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1854 while (stream.read_pair()) { |
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1855 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); |
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1856 } |
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1857 } |
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1858 } |
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1859 st->print_cr(" - localvar length: %d", localvariable_table_length()); |
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1860 if (localvariable_table_length() > 0) { |
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1861 LocalVariableTableElement* table = localvariable_table_start(); |
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1862 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); |
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1863 if (Verbose) { |
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1864 for (int i = 0; i < localvariable_table_length(); i++) { |
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1865 int bci = table[i].start_bci; |
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1866 int len = table[i].length; |
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1867 const char* name = constants()->printable_name_at(table[i].name_cp_index); |
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1868 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); |
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1869 int slot = table[i].slot; |
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1870 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); |
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1871 } |
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1872 } |
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1873 } |
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1874 if (code() != NULL) { |
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1875 st->print (" - compiled code: "); |
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1876 code()->print_value_on(st); |
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1877 } |
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1878 if (is_native()) { |
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1879 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); |
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1880 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); |
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1881 } |
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1882 } |
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1883 |
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1884 #endif //PRODUCT |
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1885 |
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1886 void Method::print_value_on(outputStream* st) const { |
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1887 assert(is_method(), "must be method"); |
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1888 st->print_cr(internal_name()); |
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1889 print_address_on(st); |
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1890 st->print(" "); |
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1891 name()->print_value_on(st); |
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1892 st->print(" "); |
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1893 signature()->print_value_on(st); |
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1894 st->print(" in "); |
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1895 method_holder()->print_value_on(st); |
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1896 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); |
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1897 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); |
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1898 } |
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1899 |
7956 | 1900 #if INCLUDE_SERVICES |
1901 // Size Statistics | |
1902 void Method::collect_statistics(KlassSizeStats *sz) const { | |
1903 int mysize = sz->count(this); | |
1904 sz->_method_bytes += mysize; | |
1905 sz->_method_all_bytes += mysize; | |
1906 sz->_rw_bytes += mysize; | |
1907 | |
1908 if (constMethod()) { | |
1909 constMethod()->collect_statistics(sz); | |
1910 } | |
1911 if (method_data()) { | |
1912 method_data()->collect_statistics(sz); | |
1913 } | |
1914 } | |
1915 #endif // INCLUDE_SERVICES | |
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1916 |
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1917 // Verification |
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1918 |
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1919 void Method::verify_on(outputStream* st) { |
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1920 guarantee(is_method(), "object must be method"); |
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1921 guarantee(is_metadata(), "should be metadata"); |
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1922 guarantee(constants()->is_constantPool(), "should be constant pool"); |
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1923 guarantee(constants()->is_metadata(), "should be metadata"); |
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1924 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); |
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1925 guarantee(constMethod()->is_metadata(), "should be metadata"); |
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1926 MethodData* md = method_data(); |
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1927 guarantee(md == NULL || |
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1928 md->is_metadata(), "should be metadata"); |
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1929 guarantee(md == NULL || |
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1930 md->is_methodData(), "should be method data"); |
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1931 } |