Mercurial > hg > truffle
annotate src/share/vm/oops/method.cpp @ 10105:aeaca88565e6
8010862: The Method counter fields used for profiling can be allocated lazily.
Summary: Allocate the method's profiling related metadata until they are needed.
Reviewed-by: coleenp, roland
author | jiangli |
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date | Tue, 09 Apr 2013 17:17:41 -0400 |
parents | 0ca3dd0ffaba |
children | 0cfa93c2fcc4 |
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_force_inline(false); |
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91 set_hidden(false); |
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92 set_dont_inline(false); |
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93 set_method_data(NULL); |
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94 set_method_counters(NULL); |
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95 set_vtable_index(Method::garbage_vtable_index); |
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96 |
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97 // Fix and bury in Method* |
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98 set_interpreter_entry(NULL); // sets i2i entry and from_int |
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99 set_adapter_entry(NULL); |
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100 clear_code(); // from_c/from_i get set to c2i/i2i |
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101 |
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102 if (access_flags.is_native()) { |
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103 clear_native_function(); |
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104 set_signature_handler(NULL); |
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105 } |
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106 |
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107 NOT_PRODUCT(set_compiled_invocation_count(0);) |
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108 } |
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109 |
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110 // Release Method*. The nmethod will be gone when we get here because |
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111 // we've walked the code cache. |
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112 void Method::deallocate_contents(ClassLoaderData* loader_data) { |
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113 MetadataFactory::free_metadata(loader_data, constMethod()); |
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114 set_constMethod(NULL); |
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115 MetadataFactory::free_metadata(loader_data, method_data()); |
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116 set_method_data(NULL); |
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117 MetadataFactory::free_metadata(loader_data, method_counters()); |
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118 set_method_counters(NULL); |
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119 // The nmethod will be gone when we get here. |
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120 if (code() != NULL) _code = NULL; |
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121 } |
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122 |
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123 address Method::get_i2c_entry() { |
0 | 124 assert(_adapter != NULL, "must have"); |
125 return _adapter->get_i2c_entry(); | |
126 } | |
127 | |
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128 address Method::get_c2i_entry() { |
0 | 129 assert(_adapter != NULL, "must have"); |
130 return _adapter->get_c2i_entry(); | |
131 } | |
132 | |
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133 address Method::get_c2i_unverified_entry() { |
0 | 134 assert(_adapter != NULL, "must have"); |
135 return _adapter->get_c2i_unverified_entry(); | |
136 } | |
137 | |
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138 char* Method::name_and_sig_as_C_string() const { |
6983 | 139 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); |
0 | 140 } |
141 | |
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142 char* Method::name_and_sig_as_C_string(char* buf, int size) const { |
6983 | 143 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); |
0 | 144 } |
145 | |
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146 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { |
0 | 147 const char* klass_name = klass->external_name(); |
148 int klass_name_len = (int)strlen(klass_name); | |
149 int method_name_len = method_name->utf8_length(); | |
150 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); | |
151 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); | |
152 strcpy(dest, klass_name); | |
153 dest[klass_name_len] = '.'; | |
154 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); | |
155 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); | |
156 dest[len] = 0; | |
157 return dest; | |
158 } | |
159 | |
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160 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { |
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161 Symbol* klass_name = klass->name(); |
0 | 162 klass_name->as_klass_external_name(buf, size); |
163 int len = (int)strlen(buf); | |
164 | |
165 if (len < size - 1) { | |
166 buf[len++] = '.'; | |
167 | |
168 method_name->as_C_string(&(buf[len]), size - len); | |
169 len = (int)strlen(buf); | |
170 | |
171 signature->as_C_string(&(buf[len]), size - len); | |
172 } | |
173 | |
174 return buf; | |
175 } | |
176 | |
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177 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { |
0 | 178 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) |
179 // access exception table | |
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180 ExceptionTable table(mh()); |
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181 int length = table.length(); |
0 | 182 // iterate through all entries sequentially |
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183 constantPoolHandle pool(THREAD, mh->constants()); |
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184 for (int i = 0; i < length; i ++) { |
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185 //reacquire the table in case a GC happened |
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186 ExceptionTable table(mh()); |
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187 int beg_bci = table.start_pc(i); |
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188 int end_bci = table.end_pc(i); |
0 | 189 assert(beg_bci <= end_bci, "inconsistent exception table"); |
190 if (beg_bci <= throw_bci && throw_bci < end_bci) { | |
191 // exception handler bci range covers throw_bci => investigate further | |
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192 int handler_bci = table.handler_pc(i); |
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193 int klass_index = table.catch_type_index(i); |
0 | 194 if (klass_index == 0) { |
195 return handler_bci; | |
196 } else if (ex_klass.is_null()) { | |
197 return handler_bci; | |
198 } else { | |
199 // we know the exception class => get the constraint class | |
200 // this may require loading of the constraint class; if verification | |
201 // fails or some other exception occurs, return handler_bci | |
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202 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); |
0 | 203 KlassHandle klass = KlassHandle(THREAD, k); |
204 assert(klass.not_null(), "klass not loaded"); | |
205 if (ex_klass->is_subtype_of(klass())) { | |
206 return handler_bci; | |
207 } | |
208 } | |
209 } | |
210 } | |
211 | |
212 return -1; | |
213 } | |
214 | |
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215 void Method::mask_for(int bci, InterpreterOopMap* mask) { |
0 | 216 |
217 Thread* myThread = Thread::current(); | |
218 methodHandle h_this(myThread, this); | |
219 #ifdef ASSERT | |
220 bool has_capability = myThread->is_VM_thread() || | |
221 myThread->is_ConcurrentGC_thread() || | |
222 myThread->is_GC_task_thread(); | |
223 | |
224 if (!has_capability) { | |
225 if (!VerifyStack && !VerifyLastFrame) { | |
226 // verify stack calls this outside VM thread | |
227 warning("oopmap should only be accessed by the " | |
228 "VM, GC task or CMS threads (or during debugging)"); | |
229 InterpreterOopMap local_mask; | |
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230 method_holder()->mask_for(h_this, bci, &local_mask); |
0 | 231 local_mask.print(); |
232 } | |
233 } | |
234 #endif | |
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235 method_holder()->mask_for(h_this, bci, mask); |
0 | 236 return; |
237 } | |
238 | |
239 | |
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240 int Method::bci_from(address bcp) const { |
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241 #ifdef ASSERT |
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242 { ResourceMark rm; |
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243 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), |
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244 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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245 } |
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246 #endif |
0 | 247 return bcp - code_base(); |
248 } | |
249 | |
250 | |
251 // Return (int)bcx if it appears to be a valid BCI. | |
252 // Return bci_from((address)bcx) if it appears to be a valid BCP. | |
253 // Return -1 otherwise. | |
254 // Used by profiling code, when invalid data is a possibility. | |
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255 // The caller is responsible for validating the Method* itself. |
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256 int Method::validate_bci_from_bcx(intptr_t bcx) const { |
0 | 257 // keep bci as -1 if not a valid bci |
258 int bci = -1; | |
259 if (bcx == 0 || (address)bcx == code_base()) { | |
260 // code_size() may return 0 and we allow 0 here | |
261 // the method may be native | |
262 bci = 0; | |
263 } else if (frame::is_bci(bcx)) { | |
264 if (bcx < code_size()) { | |
265 bci = (int)bcx; | |
266 } | |
267 } else if (contains((address)bcx)) { | |
268 bci = (address)bcx - code_base(); | |
269 } | |
270 // Assert that if we have dodged any asserts, bci is negative. | |
271 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); | |
272 return bci; | |
273 } | |
274 | |
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275 address Method::bcp_from(int bci) const { |
0 | 276 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); |
277 address bcp = code_base() + bci; | |
278 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); | |
279 return bcp; | |
280 } | |
281 | |
282 | |
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283 int Method::size(bool is_native) { |
0 | 284 // If native, then include pointers for native_function and signature_handler |
285 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; | |
286 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; | |
287 return align_object_size(header_size() + extra_words); | |
288 } | |
289 | |
290 | |
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291 Symbol* Method::klass_name() const { |
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292 Klass* k = method_holder(); |
0 | 293 assert(k->is_klass(), "must be klass"); |
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294 InstanceKlass* ik = (InstanceKlass*) k; |
0 | 295 return ik->name(); |
296 } | |
297 | |
298 | |
299 // Attempt to return method oop to original state. Clear any pointers | |
300 // (to objects outside the shared spaces). We won't be able to predict | |
301 // where they should point in a new JVM. Further initialize some | |
302 // entries now in order allow them to be write protected later. | |
303 | |
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304 void Method::remove_unshareable_info() { |
0 | 305 unlink_method(); |
306 } | |
307 | |
308 | |
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309 bool Method::was_executed_more_than(int n) { |
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310 // Invocation counter is reset when the Method* is compiled. |
0 | 311 // If the method has compiled code we therefore assume it has |
312 // be excuted more than n times. | |
313 if (is_accessor() || is_empty_method() || (code() != NULL)) { | |
314 // interpreter doesn't bump invocation counter of trivial methods | |
315 // compiler does not bump invocation counter of compiled methods | |
316 return true; | |
1783 | 317 } |
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318 else if ((method_counters() != NULL && |
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319 method_counters()->invocation_counter()->carry()) || |
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320 (method_data() != NULL && |
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321 method_data()->invocation_counter()->carry())) { |
0 | 322 // The carry bit is set when the counter overflows and causes |
323 // a compilation to occur. We don't know how many times | |
324 // the counter has been reset, so we simply assume it has | |
325 // been executed more than n times. | |
326 return true; | |
327 } else { | |
328 return invocation_count() > n; | |
329 } | |
330 } | |
331 | |
332 #ifndef PRODUCT | |
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333 void Method::print_invocation_count() { |
0 | 334 if (is_static()) tty->print("static "); |
335 if (is_final()) tty->print("final "); | |
336 if (is_synchronized()) tty->print("synchronized "); | |
337 if (is_native()) tty->print("native "); | |
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338 method_holder()->name()->print_symbol_on(tty); |
0 | 339 tty->print("."); |
340 name()->print_symbol_on(tty); | |
341 signature()->print_symbol_on(tty); | |
342 | |
343 if (WizardMode) { | |
344 // dump the size of the byte codes | |
345 tty->print(" {%d}", code_size()); | |
346 } | |
347 tty->cr(); | |
348 | |
349 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); | |
350 tty->print_cr (" invocation_counter: %8d ", invocation_count()); | |
351 tty->print_cr (" backedge_counter: %8d ", backedge_count()); | |
352 if (CountCompiledCalls) { | |
353 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); | |
354 } | |
355 | |
356 } | |
357 #endif | |
358 | |
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359 // Build a MethodData* object to hold information about this method |
0 | 360 // collected in the interpreter. |
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361 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { |
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362 // Do not profile method if current thread holds the pending list lock, |
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363 // which avoids deadlock for acquiring the MethodData_lock. |
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364 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { |
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365 return; |
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366 } |
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367 |
0 | 368 // Grab a lock here to prevent multiple |
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369 // MethodData*s from being created. |
0 | 370 MutexLocker ml(MethodData_lock, THREAD); |
371 if (method->method_data() == NULL) { | |
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372 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); |
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373 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); |
0 | 374 method->set_method_data(method_data); |
375 if (PrintMethodData && (Verbose || WizardMode)) { | |
376 ResourceMark rm(THREAD); | |
377 tty->print("build_interpreter_method_data for "); | |
378 method->print_name(tty); | |
379 tty->cr(); | |
380 // At the end of the run, the MDO, full of data, will be dumped. | |
381 } | |
382 } | |
383 } | |
384 | |
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385 MethodCounters* Method::build_method_counters(Method* m, TRAPS) { |
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386 methodHandle mh(m); |
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387 ClassLoaderData* loader_data = mh->method_holder()->class_loader_data(); |
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388 MethodCounters* counters = MethodCounters::allocate(loader_data, CHECK_NULL); |
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389 if (mh->method_counters() == NULL) { |
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390 mh->set_method_counters(counters); |
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391 } else { |
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392 MetadataFactory::free_metadata(loader_data, counters); |
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393 } |
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394 return mh->method_counters(); |
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395 } |
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396 |
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397 void Method::cleanup_inline_caches() { |
0 | 398 // The current system doesn't use inline caches in the interpreter |
399 // => nothing to do (keep this method around for future use) | |
400 } | |
401 | |
402 | |
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403 int Method::extra_stack_words() { |
710 | 404 // not an inline function, to avoid a header dependency on Interpreter |
1506 | 405 return extra_stack_entries() * Interpreter::stackElementSize; |
710 | 406 } |
407 | |
408 | |
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409 void Method::compute_size_of_parameters(Thread *thread) { |
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410 ArgumentSizeComputer asc(signature()); |
0 | 411 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); |
412 } | |
413 | |
414 #ifdef CC_INTERP | |
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415 void Method::set_result_index(BasicType type) { |
0 | 416 _result_index = Interpreter::BasicType_as_index(type); |
417 } | |
418 #endif | |
419 | |
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420 BasicType Method::result_type() const { |
0 | 421 ResultTypeFinder rtf(signature()); |
422 return rtf.type(); | |
423 } | |
424 | |
425 | |
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426 bool Method::is_empty_method() const { |
0 | 427 return code_size() == 1 |
428 && *code_base() == Bytecodes::_return; | |
429 } | |
430 | |
431 | |
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432 bool Method::is_vanilla_constructor() const { |
0 | 433 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method |
434 // which only calls the superclass vanilla constructor and possibly does stores of | |
435 // zero constants to local fields: | |
436 // | |
437 // aload_0 | |
438 // invokespecial | |
439 // indexbyte1 | |
440 // indexbyte2 | |
441 // | |
442 // followed by an (optional) sequence of: | |
443 // | |
444 // aload_0 | |
445 // aconst_null / iconst_0 / fconst_0 / dconst_0 | |
446 // putfield | |
447 // indexbyte1 | |
448 // indexbyte2 | |
449 // | |
450 // followed by: | |
451 // | |
452 // return | |
453 | |
454 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); | |
455 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); | |
456 int size = code_size(); | |
457 // Check if size match | |
458 if (size == 0 || size % 5 != 0) return false; | |
459 address cb = code_base(); | |
460 int last = size - 1; | |
461 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { | |
462 // Does not call superclass default constructor | |
463 return false; | |
464 } | |
465 // Check optional sequence | |
466 for (int i = 4; i < last; i += 5) { | |
467 if (cb[i] != Bytecodes::_aload_0) return false; | |
468 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; | |
469 if (cb[i+2] != Bytecodes::_putfield) return false; | |
470 } | |
471 return true; | |
472 } | |
473 | |
474 | |
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475 bool Method::compute_has_loops_flag() { |
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476 BytecodeStream bcs(this); |
0 | 477 Bytecodes::Code bc; |
478 | |
479 while ((bc = bcs.next()) >= 0) { | |
480 switch( bc ) { | |
481 case Bytecodes::_ifeq: | |
482 case Bytecodes::_ifnull: | |
483 case Bytecodes::_iflt: | |
484 case Bytecodes::_ifle: | |
485 case Bytecodes::_ifne: | |
486 case Bytecodes::_ifnonnull: | |
487 case Bytecodes::_ifgt: | |
488 case Bytecodes::_ifge: | |
489 case Bytecodes::_if_icmpeq: | |
490 case Bytecodes::_if_icmpne: | |
491 case Bytecodes::_if_icmplt: | |
492 case Bytecodes::_if_icmpgt: | |
493 case Bytecodes::_if_icmple: | |
494 case Bytecodes::_if_icmpge: | |
495 case Bytecodes::_if_acmpeq: | |
496 case Bytecodes::_if_acmpne: | |
497 case Bytecodes::_goto: | |
498 case Bytecodes::_jsr: | |
499 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
500 break; | |
501 | |
502 case Bytecodes::_goto_w: | |
503 case Bytecodes::_jsr_w: | |
504 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
505 break; | |
506 } | |
507 } | |
508 _access_flags.set_loops_flag_init(); | |
509 return _access_flags.has_loops(); | |
510 } | |
511 | |
512 | |
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513 bool Method::is_final_method() const { |
0 | 514 // %%% Should return true for private methods also, |
515 // since there is no way to override them. | |
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516 return is_final() || method_holder()->is_final(); |
0 | 517 } |
518 | |
519 | |
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520 bool Method::is_strict_method() const { |
0 | 521 return is_strict(); |
522 } | |
523 | |
524 | |
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525 bool Method::can_be_statically_bound() const { |
0 | 526 if (is_final_method()) return true; |
527 return vtable_index() == nonvirtual_vtable_index; | |
528 } | |
529 | |
530 | |
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531 bool Method::is_accessor() const { |
0 | 532 if (code_size() != 5) return false; |
533 if (size_of_parameters() != 1) return false; | |
2142 | 534 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; |
535 if (java_code_at(1) != Bytecodes::_getfield) return false; | |
536 if (java_code_at(4) != Bytecodes::_areturn && | |
537 java_code_at(4) != Bytecodes::_ireturn ) return false; | |
0 | 538 return true; |
539 } | |
540 | |
541 | |
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542 bool Method::is_initializer() const { |
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543 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); |
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544 } |
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545 |
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546 bool Method::has_valid_initializer_flags() const { |
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547 return (is_static() || |
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548 method_holder()->major_version() < 51); |
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549 } |
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550 |
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551 bool Method::is_static_initializer() const { |
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552 // For classfiles version 51 or greater, ensure that the clinit method is |
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553 // static. Non-static methods with the name "<clinit>" are not static |
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554 // initializers. (older classfiles exempted for backward compatibility) |
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555 return name() == vmSymbols::class_initializer_name() && |
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556 has_valid_initializer_flags(); |
0 | 557 } |
558 | |
559 | |
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560 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { |
0 | 561 int length = this_oop->checked_exceptions_length(); |
562 if (length == 0) { // common case | |
563 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); | |
564 } else { | |
565 methodHandle h_this(THREAD, this_oop); | |
1142 | 566 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); |
0 | 567 objArrayHandle mirrors (THREAD, m_oop); |
568 for (int i = 0; i < length; i++) { | |
569 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe | |
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570 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); |
6983 | 571 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); |
572 mirrors->obj_at_put(i, k->java_mirror()); | |
0 | 573 } |
574 return mirrors; | |
575 } | |
576 }; | |
577 | |
578 | |
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579 int Method::line_number_from_bci(int bci) const { |
0 | 580 if (bci == SynchronizationEntryBCI) bci = 0; |
581 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); | |
582 int best_bci = 0; | |
583 int best_line = -1; | |
584 | |
585 if (has_linenumber_table()) { | |
586 // The line numbers are a short array of 2-tuples [start_pc, line_number]. | |
587 // Not necessarily sorted and not necessarily one-to-one. | |
588 CompressedLineNumberReadStream stream(compressed_linenumber_table()); | |
589 while (stream.read_pair()) { | |
590 if (stream.bci() == bci) { | |
591 // perfect match | |
592 return stream.line(); | |
593 } else { | |
594 // update best_bci/line | |
595 if (stream.bci() < bci && stream.bci() >= best_bci) { | |
596 best_bci = stream.bci(); | |
597 best_line = stream.line(); | |
598 } | |
599 } | |
600 } | |
601 } | |
602 return best_line; | |
603 } | |
604 | |
605 | |
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606 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { |
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607 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { |
0 | 608 Thread *thread = Thread::current(); |
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609 Symbol* klass_name = constants()->klass_name_at(klass_index); |
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610 Handle loader(thread, method_holder()->class_loader()); |
6983 | 611 Handle prot (thread, method_holder()->protection_domain()); |
0 | 612 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; |
613 } else { | |
614 return true; | |
615 } | |
616 } | |
617 | |
618 | |
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619 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { |
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620 int klass_index = constants()->klass_ref_index_at(refinfo_index); |
0 | 621 if (must_be_resolved) { |
622 // Make sure klass is resolved in constantpool. | |
623 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; | |
624 } | |
625 return is_klass_loaded_by_klass_index(klass_index); | |
626 } | |
627 | |
628 | |
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629 void Method::set_native_function(address function, bool post_event_flag) { |
0 | 630 assert(function != NULL, "use clear_native_function to unregister natives"); |
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631 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); |
0 | 632 address* native_function = native_function_addr(); |
633 | |
634 // We can see racers trying to place the same native function into place. Once | |
635 // is plenty. | |
636 address current = *native_function; | |
637 if (current == function) return; | |
638 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && | |
639 function != NULL) { | |
640 // native_method_throw_unsatisfied_link_error_entry() should only | |
641 // be passed when post_event_flag is false. | |
642 assert(function != | |
643 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
644 "post_event_flag mis-match"); | |
645 | |
646 // post the bind event, and possible change the bind function | |
647 JvmtiExport::post_native_method_bind(this, &function); | |
648 } | |
649 *native_function = function; | |
650 // This function can be called more than once. We must make sure that we always | |
651 // use the latest registered method -> check if a stub already has been generated. | |
652 // If so, we have to make it not_entrant. | |
653 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates | |
654 if (nm != NULL) { | |
655 nm->make_not_entrant(); | |
656 } | |
657 } | |
658 | |
659 | |
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660 bool Method::has_native_function() const { |
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661 if (is_method_handle_intrinsic()) |
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662 return false; // special-cased in SharedRuntime::generate_native_wrapper |
0 | 663 address func = native_function(); |
664 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); | |
665 } | |
666 | |
667 | |
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668 void Method::clear_native_function() { |
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669 // Note: is_method_handle_intrinsic() is allowed here. |
0 | 670 set_native_function( |
671 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
672 !native_bind_event_is_interesting); | |
673 clear_code(); | |
674 } | |
675 | |
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676 address Method::critical_native_function() { |
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677 methodHandle mh(this); |
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678 return NativeLookup::lookup_critical_entry(mh); |
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679 } |
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680 |
0 | 681 |
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682 void Method::set_signature_handler(address handler) { |
0 | 683 address* signature_handler = signature_handler_addr(); |
684 *signature_handler = handler; | |
685 } | |
686 | |
687 | |
7998 | 688 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason) { |
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689 if (PrintCompilation && report) { |
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690 ttyLocker ttyl; |
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691 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); |
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692 if (comp_level == CompLevel_all) { |
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693 tty->print("all levels "); |
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694 } else { |
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695 tty->print("levels "); |
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696 for (int i = (int)CompLevel_none; i <= comp_level; i++) { |
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697 tty->print("%d ", i); |
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698 } |
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699 } |
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700 this->print_short_name(tty); |
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701 int size = this->code_size(); |
7998 | 702 if (size > 0) { |
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703 tty->print(" (%d bytes)", size); |
7998 | 704 } |
705 if (reason != NULL) { | |
706 tty->print(" %s", reason); | |
707 } | |
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708 tty->cr(); |
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709 } |
0 | 710 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { |
711 ttyLocker ttyl; | |
6843 | 712 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", |
713 is_osr ? "osr_" : "", os::current_thread_id()); | |
7998 | 714 if (reason != NULL) { |
715 xtty->print(" reason=\'%s\'", reason); | |
716 } | |
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717 xtty->method(this); |
0 | 718 xtty->stamp(); |
719 xtty->end_elem(); | |
720 } | |
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721 } |
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722 |
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723 bool Method::is_not_compilable(int comp_level) const { |
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724 if (number_of_breakpoints() > 0) |
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725 return true; |
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726 if (is_method_handle_intrinsic()) |
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727 return !is_synthetic(); // the generated adapters must be compiled |
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728 if (comp_level == CompLevel_any) |
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729 return is_not_c1_compilable() || is_not_c2_compilable(); |
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730 if (is_c1_compile(comp_level)) |
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731 return is_not_c1_compilable(); |
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732 if (is_c2_compile(comp_level)) |
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733 return is_not_c2_compilable(); |
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734 return false; |
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735 } |
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736 |
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737 // call this when compiler finds that this method is not compilable |
7998 | 738 void Method::set_not_compilable(int comp_level, bool report, const char* reason) { |
739 print_made_not_compilable(comp_level, /*is_osr*/ false, report, reason); | |
1783 | 740 if (comp_level == CompLevel_all) { |
741 set_not_c1_compilable(); | |
742 set_not_c2_compilable(); | |
743 } else { | |
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744 if (is_c1_compile(comp_level)) |
1783 | 745 set_not_c1_compilable(); |
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746 if (is_c2_compile(comp_level)) |
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747 set_not_c2_compilable(); |
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748 } |
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749 CompilationPolicy::policy()->disable_compilation(this); |
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750 } |
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751 |
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752 bool Method::is_not_osr_compilable(int comp_level) const { |
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753 if (is_not_compilable(comp_level)) |
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754 return true; |
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755 if (comp_level == CompLevel_any) |
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756 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); |
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757 if (is_c1_compile(comp_level)) |
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758 return is_not_c1_osr_compilable(); |
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759 if (is_c2_compile(comp_level)) |
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760 return is_not_c2_osr_compilable(); |
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761 return false; |
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762 } |
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763 |
7998 | 764 void Method::set_not_osr_compilable(int comp_level, bool report, const char* reason) { |
765 print_made_not_compilable(comp_level, /*is_osr*/ true, report, reason); | |
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766 if (comp_level == CompLevel_all) { |
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767 set_not_c1_osr_compilable(); |
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768 set_not_c2_osr_compilable(); |
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769 } else { |
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770 if (is_c1_compile(comp_level)) |
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771 set_not_c1_osr_compilable(); |
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772 if (is_c2_compile(comp_level)) |
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773 set_not_c2_osr_compilable(); |
0 | 774 } |
1783 | 775 CompilationPolicy::policy()->disable_compilation(this); |
0 | 776 } |
777 | |
778 // Revert to using the interpreter and clear out the nmethod | |
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779 void Method::clear_code() { |
0 | 780 |
781 // this may be NULL if c2i adapters have not been made yet | |
782 // Only should happen at allocate time. | |
783 if (_adapter == NULL) { | |
784 _from_compiled_entry = NULL; | |
785 } else { | |
786 _from_compiled_entry = _adapter->get_c2i_entry(); | |
787 } | |
788 OrderAccess::storestore(); | |
789 _from_interpreted_entry = _i2i_entry; | |
790 OrderAccess::storestore(); | |
791 _code = NULL; | |
792 } | |
793 | |
794 // Called by class data sharing to remove any entry points (which are not shared) | |
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795 void Method::unlink_method() { |
0 | 796 _code = NULL; |
797 _i2i_entry = NULL; | |
798 _from_interpreted_entry = NULL; | |
799 if (is_native()) { | |
800 *native_function_addr() = NULL; | |
801 set_signature_handler(NULL); | |
802 } | |
803 NOT_PRODUCT(set_compiled_invocation_count(0);) | |
804 _adapter = NULL; | |
805 _from_compiled_entry = NULL; | |
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806 |
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807 // In case of DumpSharedSpaces, _method_data should always be NULL. |
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808 // |
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809 // During runtime (!DumpSharedSpaces), when we are cleaning a |
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810 // shared class that failed to load, this->link_method() may |
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811 // have already been called (before an exception happened), so |
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812 // this->_method_data may not be NULL. |
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813 assert(!DumpSharedSpaces || _method_data == NULL, "unexpected method data?"); |
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814 |
0 | 815 set_method_data(NULL); |
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816 set_method_counters(NULL); |
0 | 817 } |
818 | |
819 // Called when the method_holder is getting linked. Setup entrypoints so the method | |
820 // is ready to be called from interpreter, compiler, and vtables. | |
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821 void Method::link_method(methodHandle h_method, TRAPS) { |
3748 | 822 // If the code cache is full, we may reenter this function for the |
823 // leftover methods that weren't linked. | |
824 if (_i2i_entry != NULL) return; | |
825 | |
0 | 826 assert(_adapter == NULL, "init'd to NULL" ); |
827 assert( _code == NULL, "nothing compiled yet" ); | |
828 | |
829 // Setup interpreter entrypoint | |
830 assert(this == h_method(), "wrong h_method()" ); | |
831 address entry = Interpreter::entry_for_method(h_method); | |
832 assert(entry != NULL, "interpreter entry must be non-null"); | |
833 // Sets both _i2i_entry and _from_interpreted_entry | |
834 set_interpreter_entry(entry); | |
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835 if (is_native() && !is_method_handle_intrinsic()) { |
0 | 836 set_native_function( |
837 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
838 !native_bind_event_is_interesting); | |
839 } | |
840 | |
841 // Setup compiler entrypoint. This is made eagerly, so we do not need | |
842 // special handling of vtables. An alternative is to make adapters more | |
843 // lazily by calling make_adapter() from from_compiled_entry() for the | |
844 // normal calls. For vtable calls life gets more complicated. When a | |
845 // call-site goes mega-morphic we need adapters in all methods which can be | |
846 // called from the vtable. We need adapters on such methods that get loaded | |
847 // later. Ditto for mega-morphic itable calls. If this proves to be a | |
848 // problem we'll make these lazily later. | |
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849 (void) make_adapters(h_method, CHECK); |
0 | 850 |
851 // ONLY USE the h_method now as make_adapter may have blocked | |
852 | |
853 } | |
854 | |
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855 address Method::make_adapters(methodHandle mh, TRAPS) { |
0 | 856 // Adapters for compiled code are made eagerly here. They are fairly |
857 // small (generally < 100 bytes) and quick to make (and cached and shared) | |
858 // so making them eagerly shouldn't be too expensive. | |
859 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); | |
860 if (adapter == NULL ) { | |
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861 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); |
0 | 862 } |
863 | |
864 mh->set_adapter_entry(adapter); | |
865 mh->_from_compiled_entry = adapter->get_c2i_entry(); | |
866 return adapter->get_c2i_entry(); | |
867 } | |
868 | |
869 // The verified_code_entry() must be called when a invoke is resolved | |
870 // on this method. | |
871 | |
872 // It returns the compiled code entry point, after asserting not null. | |
873 // This function is called after potential safepoints so that nmethod | |
874 // or adapter that it points to is still live and valid. | |
875 // This function must not hit a safepoint! | |
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876 address Method::verified_code_entry() { |
0 | 877 debug_only(No_Safepoint_Verifier nsv;) |
1202 | 878 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); |
879 if (code == NULL && UseCodeCacheFlushing) { | |
880 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); | |
881 if (saved_code != NULL) { | |
882 methodHandle method(this); | |
883 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); | |
884 set_code( method, saved_code ); | |
885 } | |
886 } | |
887 | |
0 | 888 assert(_from_compiled_entry != NULL, "must be set"); |
889 return _from_compiled_entry; | |
890 } | |
891 | |
892 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all | |
893 // (could be racing a deopt). | |
894 // Not inline to avoid circular ref. | |
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895 bool Method::check_code() const { |
0 | 896 // cached in a register or local. There's a race on the value of the field. |
897 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); | |
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898 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); |
0 | 899 } |
900 | |
901 // Install compiled code. Instantly it can execute. | |
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902 void Method::set_code(methodHandle mh, nmethod *code) { |
0 | 903 assert( code, "use clear_code to remove code" ); |
904 assert( mh->check_code(), "" ); | |
905 | |
906 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); | |
907 | |
908 // These writes must happen in this order, because the interpreter will | |
909 // directly jump to from_interpreted_entry which jumps to an i2c adapter | |
910 // which jumps to _from_compiled_entry. | |
911 mh->_code = code; // Assign before allowing compiled code to exec | |
912 | |
913 int comp_level = code->comp_level(); | |
914 // In theory there could be a race here. In practice it is unlikely | |
915 // and not worth worrying about. | |
1783 | 916 if (comp_level > mh->highest_comp_level()) { |
917 mh->set_highest_comp_level(comp_level); | |
0 | 918 } |
919 | |
920 OrderAccess::storestore(); | |
1692 | 921 #ifdef SHARK |
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922 mh->_from_interpreted_entry = code->insts_begin(); |
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923 #else //!SHARK |
0 | 924 mh->_from_compiled_entry = code->verified_entry_point(); |
925 OrderAccess::storestore(); | |
926 // Instantly compiled code can execute. | |
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927 if (!mh->is_method_handle_intrinsic()) |
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928 mh->_from_interpreted_entry = mh->get_i2c_entry(); |
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929 #endif //!SHARK |
0 | 930 } |
931 | |
932 | |
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933 bool Method::is_overridden_in(Klass* k) const { |
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934 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 935 |
936 if (ik->is_interface()) return false; | |
937 | |
938 // If method is an interface, we skip it - except if it | |
939 // is a miranda method | |
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940 if (method_holder()->is_interface()) { |
0 | 941 // Check that method is not a miranda method |
942 if (ik->lookup_method(name(), signature()) == NULL) { | |
943 // No implementation exist - so miranda method | |
944 return false; | |
945 } | |
946 return true; | |
947 } | |
948 | |
949 assert(ik->is_subclass_of(method_holder()), "should be subklass"); | |
950 assert(ik->vtable() != NULL, "vtable should exist"); | |
951 if (vtable_index() == nonvirtual_vtable_index) { | |
952 return false; | |
953 } else { | |
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954 Method* vt_m = ik->method_at_vtable(vtable_index()); |
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955 return vt_m != this; |
0 | 956 } |
957 } | |
958 | |
959 | |
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960 // give advice about whether this Method* should be cached or not |
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961 bool Method::should_not_be_cached() const { |
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962 if (is_old()) { |
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963 // This method has been redefined. It is either EMCP or obsolete |
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964 // and we don't want to cache it because that would pin the method |
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965 // down and prevent it from being collectible if and when it |
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966 // finishes executing. |
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967 return true; |
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968 } |
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969 |
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970 // caching this method should be just fine |
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971 return false; |
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972 } |
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973 |
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974 |
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975 /** |
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976 * Returns true if this is one of the specially treated methods for |
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977 * security related stack walks (like Reflection.getCallerClass). |
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978 */ |
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979 bool Method::is_ignored_by_security_stack_walk() const { |
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980 const bool use_new_reflection = JDK_Version::is_gte_jdk14x_version() && UseNewReflection; |
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981 |
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982 assert(intrinsic_id() != vmIntrinsics::_invoke || Universe::reflect_invoke_cache()->is_same_method((Method*)this), "sanity"); |
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983 if (intrinsic_id() == vmIntrinsics::_invoke) { |
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984 // This is Method.invoke() -- ignore it |
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985 return true; |
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986 } |
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987 if (use_new_reflection && |
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988 method_holder()->is_subclass_of(SystemDictionary::reflect_MethodAccessorImpl_klass())) { |
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989 // This is an auxilary frame -- ignore it |
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990 return true; |
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991 } |
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992 if (is_method_handle_intrinsic() || is_compiled_lambda_form()) { |
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993 // This is an internal adapter frame for method handles -- ignore it |
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994 return true; |
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995 } |
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996 return false; |
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997 } |
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998 |
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999 |
710 | 1000 // Constant pool structure for invoke methods: |
1001 enum { | |
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1002 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. |
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1003 _imcp_invoke_signature, // utf8: (variable Symbol*) |
710 | 1004 _imcp_limit |
1005 }; | |
1006 | |
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1007 // Test if this method is an MH adapter frame generated by Java code. |
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1008 // Cf. java/lang/invoke/InvokerBytecodeGenerator |
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1009 bool Method::is_compiled_lambda_form() const { |
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1010 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; |
710 | 1011 } |
1012 | |
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1013 // Test if this method is an internal MH primitive method. |
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1014 bool Method::is_method_handle_intrinsic() const { |
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1015 vmIntrinsics::ID iid = intrinsic_id(); |
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1016 return (MethodHandles::is_signature_polymorphic(iid) && |
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1017 MethodHandles::is_signature_polymorphic_intrinsic(iid)); |
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1018 } |
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1019 |
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1020 bool Method::has_member_arg() const { |
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1021 vmIntrinsics::ID iid = intrinsic_id(); |
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1022 return (MethodHandles::is_signature_polymorphic(iid) && |
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1023 MethodHandles::has_member_arg(iid)); |
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1024 } |
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1025 |
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1026 // Make an instance of a signature-polymorphic internal MH primitive. |
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1027 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, |
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1028 Symbol* signature, |
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1029 TRAPS) { |
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1030 ResourceMark rm; |
710 | 1031 methodHandle empty; |
1032 | |
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1033 KlassHandle holder = SystemDictionary::MethodHandle_klass(); |
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1034 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); |
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1035 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); |
710 | 1036 if (TraceMethodHandles) { |
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1037 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); |
710 | 1038 } |
1039 | |
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1040 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) |
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1041 name->increment_refcount(); |
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1042 signature->increment_refcount(); |
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1043 |
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1044 int cp_length = _imcp_limit; |
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1045 ClassLoaderData* loader_data = holder->class_loader_data(); |
710 | 1046 constantPoolHandle cp; |
1047 { | |
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1048 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); |
710 | 1049 cp = constantPoolHandle(THREAD, cp_oop); |
1050 } | |
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1051 cp->set_pool_holder(InstanceKlass::cast(holder())); |
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1052 cp->symbol_at_put(_imcp_invoke_name, name); |
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1053 cp->symbol_at_put(_imcp_invoke_signature, signature); |
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1054 cp->set_has_preresolution(); |
710 | 1055 |
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1056 // decide on access bits: public or not? |
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1057 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); |
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1058 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); |
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1059 if (must_be_static) flags_bits |= JVM_ACC_STATIC; |
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1060 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); |
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1061 |
710 | 1062 methodHandle m; |
1063 { | |
8031 | 1064 InlineTableSizes sizes; |
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1065 Method* m_oop = Method::allocate(loader_data, 0, |
8031 | 1066 accessFlags_from(flags_bits), &sizes, |
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1067 ConstMethod::NORMAL, CHECK_(empty)); |
710 | 1068 m = methodHandle(THREAD, m_oop); |
1069 } | |
1070 m->set_constants(cp()); | |
1071 m->set_name_index(_imcp_invoke_name); | |
1072 m->set_signature_index(_imcp_invoke_signature); | |
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1073 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); |
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1074 assert(m->signature() == signature, ""); |
710 | 1075 #ifdef CC_INTERP |
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1076 ResultTypeFinder rtf(signature); |
710 | 1077 m->set_result_index(rtf.type()); |
1078 #endif | |
1079 m->compute_size_of_parameters(THREAD); | |
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1080 m->init_intrinsic_id(); |
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1081 assert(m->is_method_handle_intrinsic(), ""); |
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1082 #ifdef ASSERT |
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1083 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); |
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1084 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); |
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1085 assert(m->intrinsic_id() == iid, "correctly predicted iid"); |
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1086 #endif //ASSERT |
710 | 1087 |
1088 // Finally, set up its entry points. | |
1089 assert(m->can_be_statically_bound(), ""); | |
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1090 m->set_vtable_index(Method::nonvirtual_vtable_index); |
710 | 1091 m->link_method(m, CHECK_(empty)); |
1092 | |
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1093 if (TraceMethodHandles && (Verbose || WizardMode)) |
710 | 1094 m->print_on(tty); |
1095 | |
1096 return m; | |
1097 } | |
1098 | |
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1099 Klass* Method::check_non_bcp_klass(Klass* klass) { |
6983 | 1100 if (klass != NULL && klass->class_loader() != NULL) { |
1101 if (klass->oop_is_objArray()) | |
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1102 klass = ObjArrayKlass::cast(klass)->bottom_klass(); |
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1103 return klass; |
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1104 } |
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1105 return NULL; |
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1106 } |
710 | 1107 |
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1108 |
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1109 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, |
0 | 1110 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { |
1111 // Code below does not work for native methods - they should never get rewritten anyway | |
1112 assert(!m->is_native(), "cannot rewrite native methods"); | |
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1113 // Allocate new Method* |
0 | 1114 AccessFlags flags = m->access_flags(); |
8031 | 1115 |
1116 ConstMethod* cm = m->constMethod(); | |
1117 int checked_exceptions_len = cm->checked_exceptions_length(); | |
1118 int localvariable_len = cm->localvariable_table_length(); | |
1119 int exception_table_len = cm->exception_table_length(); | |
1120 int method_parameters_len = cm->method_parameters_length(); | |
1121 int method_annotations_len = cm->method_annotations_length(); | |
1122 int parameter_annotations_len = cm->parameter_annotations_length(); | |
1123 int type_annotations_len = cm->type_annotations_length(); | |
1124 int default_annotations_len = cm->default_annotations_length(); | |
1125 | |
1126 InlineTableSizes sizes( | |
1127 localvariable_len, | |
1128 new_compressed_linenumber_size, | |
1129 exception_table_len, | |
1130 checked_exceptions_len, | |
1131 method_parameters_len, | |
1132 cm->generic_signature_index(), | |
1133 method_annotations_len, | |
1134 parameter_annotations_len, | |
1135 type_annotations_len, | |
1136 default_annotations_len, | |
1137 0); | |
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1138 |
6934 | 1139 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); |
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1140 Method* newm_oop = Method::allocate(loader_data, |
6934 | 1141 new_code_length, |
1142 flags, | |
8031 | 1143 &sizes, |
6934 | 1144 m->method_type(), |
1145 CHECK_(methodHandle())); | |
0 | 1146 methodHandle newm (THREAD, newm_oop); |
1147 int new_method_size = newm->method_size(); | |
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1148 |
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1149 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* |
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1150 ConstMethod* newcm = newm->constMethod(); |
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1151 int new_const_method_size = newm->constMethod()->size(); |
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1152 |
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1153 memcpy(newm(), m(), sizeof(Method)); |
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1154 |
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1155 // Create shallow copy of ConstMethod. |
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1156 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); |
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1157 |
0 | 1158 // Reset correct method/const method, method size, and parameter info |
1159 newm->set_constMethod(newcm); | |
1160 newm->constMethod()->set_code_size(new_code_length); | |
1161 newm->constMethod()->set_constMethod_size(new_const_method_size); | |
1162 newm->set_method_size(new_method_size); | |
1163 assert(newm->code_size() == new_code_length, "check"); | |
1164 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); | |
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1165 assert(newm->exception_table_length() == exception_table_len, "check"); |
0 | 1166 assert(newm->localvariable_table_length() == localvariable_len, "check"); |
1167 // Copy new byte codes | |
1168 memcpy(newm->code_base(), new_code, new_code_length); | |
1169 // Copy line number table | |
1170 if (new_compressed_linenumber_size > 0) { | |
1171 memcpy(newm->compressed_linenumber_table(), | |
1172 new_compressed_linenumber_table, | |
1173 new_compressed_linenumber_size); | |
1174 } | |
1175 // Copy checked_exceptions | |
1176 if (checked_exceptions_len > 0) { | |
1177 memcpy(newm->checked_exceptions_start(), | |
1178 m->checked_exceptions_start(), | |
1179 checked_exceptions_len * sizeof(CheckedExceptionElement)); | |
1180 } | |
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1181 // Copy exception table |
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1182 if (exception_table_len > 0) { |
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1183 memcpy(newm->exception_table_start(), |
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1184 m->exception_table_start(), |
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1185 exception_table_len * sizeof(ExceptionTableElement)); |
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1186 } |
0 | 1187 // Copy local variable number table |
1188 if (localvariable_len > 0) { | |
1189 memcpy(newm->localvariable_table_start(), | |
1190 m->localvariable_table_start(), | |
1191 localvariable_len * sizeof(LocalVariableTableElement)); | |
1192 } | |
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1193 // Copy stackmap table |
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1194 if (m->has_stackmap_table()) { |
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1195 int code_attribute_length = m->stackmap_data()->length(); |
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1196 Array<u1>* stackmap_data = |
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1197 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); |
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1198 memcpy((void*)stackmap_data->adr_at(0), |
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1199 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); |
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1200 newm->set_stackmap_data(stackmap_data); |
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1201 } |
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1202 |
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1203 // copy annotations over to new method |
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1204 newcm->copy_annotations_from(cm); |
0 | 1205 return newm; |
1206 } | |
1207 | |
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1208 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { |
0 | 1209 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics |
1210 // because we are not loading from core libraries | |
6894 | 1211 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar |
1212 // which does not use the class default class loader so we check for its loader here | |
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1213 InstanceKlass* ik = InstanceKlass::cast(holder); |
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1214 if ((ik->class_loader() != NULL) && !SystemDictionary::is_ext_class_loader(ik->class_loader())) { |
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1215 return vmSymbols::NO_SID; // regardless of name, no intrinsics here |
6894 | 1216 } |
0 | 1217 |
1218 // see if the klass name is well-known: | |
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1219 Symbol* klass_name = ik->name(); |
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1220 return vmSymbols::find_sid(klass_name); |
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1221 } |
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1222 |
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1223 void Method::init_intrinsic_id() { |
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1224 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); |
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1225 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); |
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1226 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); |
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1227 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); |
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1228 |
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1229 // the klass name is well-known: |
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1230 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); |
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1231 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); |
0 | 1232 |
1233 // ditto for method and signature: | |
1234 vmSymbols::SID name_id = vmSymbols::find_sid(name()); | |
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1235 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1236 && name_id == vmSymbols::NO_SID) |
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1237 return; |
0 | 1238 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); |
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1239 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1240 && sig_id == vmSymbols::NO_SID) return; |
0 | 1241 jshort flags = access_flags().as_short(); |
1242 | |
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1243 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
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1244 if (id != vmIntrinsics::_none) { |
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1245 set_intrinsic_id(id); |
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1246 return; |
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1247 } |
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1248 |
0 | 1249 // A few slightly irregular cases: |
1250 switch (klass_id) { | |
1251 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): | |
1252 // Second chance: check in regular Math. | |
1253 switch (name_id) { | |
1254 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): | |
1255 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): | |
1256 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): | |
1257 // pretend it is the corresponding method in the non-strict class: | |
1258 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); | |
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1259 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
0 | 1260 break; |
1261 } | |
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1262 break; |
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1263 |
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1264 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. |
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1265 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): |
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1266 if (!is_native()) break; |
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1267 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); |
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1268 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) |
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1269 id = vmIntrinsics::_none; |
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1270 break; |
0 | 1271 } |
1272 | |
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1273 if (id != vmIntrinsics::_none) { |
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1274 // Set up its iid. It is an alias method. |
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1275 set_intrinsic_id(id); |
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1276 return; |
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1277 } |
0 | 1278 } |
1279 | |
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1280 // These two methods are static since a GC may move the Method |
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1281 bool Method::load_signature_classes(methodHandle m, TRAPS) { |
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1282 if (THREAD->is_Compiler_thread()) { |
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1283 // There is nothing useful this routine can do from within the Compile thread. |
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1284 // Hopefully, the signature contains only well-known classes. |
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1285 // We could scan for this and return true/false, but the caller won't care. |
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1286 return false; |
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1287 } |
0 | 1288 bool sig_is_loaded = true; |
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1289 Handle class_loader(THREAD, m->method_holder()->class_loader()); |
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1290 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); |
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1291 ResourceMark rm(THREAD); |
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1292 Symbol* signature = m->signature(); |
0 | 1293 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1294 if (ss.is_object()) { | |
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1295 Symbol* sym = ss.as_symbol(CHECK_(false)); |
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1296 Symbol* name = sym; |
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1297 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, |
0 | 1298 protection_domain, THREAD); |
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1299 // We are loading classes eagerly. If a ClassNotFoundException or |
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1300 // a LinkageError was generated, be sure to ignore it. |
0 | 1301 if (HAS_PENDING_EXCEPTION) { |
1142 | 1302 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || |
1303 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { | |
0 | 1304 CLEAR_PENDING_EXCEPTION; |
1305 } else { | |
1306 return false; | |
1307 } | |
1308 } | |
1309 if( klass == NULL) { sig_is_loaded = false; } | |
1310 } | |
1311 } | |
1312 return sig_is_loaded; | |
1313 } | |
1314 | |
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1315 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { |
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1316 Handle class_loader(THREAD, m->method_holder()->class_loader()); |
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1317 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); |
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1318 ResourceMark rm(THREAD); |
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1319 Symbol* signature = m->signature(); |
0 | 1320 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1321 if (ss.type() == T_OBJECT) { | |
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1322 Symbol* name = ss.as_symbol_or_null(); |
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1323 if (name == NULL) return true; |
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1324 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); |
0 | 1325 if (klass == NULL) return true; |
1326 } | |
1327 } | |
1328 return false; | |
1329 } | |
1330 | |
1331 // Exposed so field engineers can debug VM | |
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1332 void Method::print_short_name(outputStream* st) { |
0 | 1333 ResourceMark rm; |
1334 #ifdef PRODUCT | |
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1335 st->print(" %s::", method_holder()->external_name()); |
0 | 1336 #else |
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1337 st->print(" %s::", method_holder()->internal_name()); |
0 | 1338 #endif |
1339 name()->print_symbol_on(st); | |
1340 if (WizardMode) signature()->print_symbol_on(st); | |
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1341 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) |
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1342 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); |
0 | 1343 } |
1344 | |
3779 | 1345 // Comparer for sorting an object array containing |
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1346 // Method*s. |
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1347 static int method_comparator(Method* a, Method* b) { |
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1348 return a->name()->fast_compare(b->name()); |
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1349 } |
0 | 1350 |
1351 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
8031 | 1352 void Method::sort_methods(Array<Method*>* methods, bool idempotent) { |
0 | 1353 int length = methods->length(); |
1354 if (length > 1) { | |
3779 | 1355 { |
1356 No_Safepoint_Verifier nsv; | |
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1357 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); |
0 | 1358 } |
1359 // Reset method ordering | |
1360 for (int i = 0; i < length; i++) { | |
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1361 Method* m = methods->at(i); |
0 | 1362 m->set_method_idnum(i); |
1363 } | |
1364 } | |
1365 } | |
1366 | |
1367 | |
1368 //----------------------------------------------------------------------------------- | |
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1369 // Non-product code unless JVM/TI needs it |
0 | 1370 |
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1371 #if !defined(PRODUCT) || INCLUDE_JVMTI |
0 | 1372 class SignatureTypePrinter : public SignatureTypeNames { |
1373 private: | |
1374 outputStream* _st; | |
1375 bool _use_separator; | |
1376 | |
1377 void type_name(const char* name) { | |
1378 if (_use_separator) _st->print(", "); | |
1379 _st->print(name); | |
1380 _use_separator = true; | |
1381 } | |
1382 | |
1383 public: | |
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1384 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { |
0 | 1385 _st = st; |
1386 _use_separator = false; | |
1387 } | |
1388 | |
1389 void print_parameters() { _use_separator = false; iterate_parameters(); } | |
1390 void print_returntype() { _use_separator = false; iterate_returntype(); } | |
1391 }; | |
1392 | |
1393 | |
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1394 void Method::print_name(outputStream* st) { |
0 | 1395 Thread *thread = Thread::current(); |
1396 ResourceMark rm(thread); | |
1397 SignatureTypePrinter sig(signature(), st); | |
1398 st->print("%s ", is_static() ? "static" : "virtual"); | |
1399 sig.print_returntype(); | |
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1400 st->print(" %s.", method_holder()->internal_name()); |
0 | 1401 name()->print_symbol_on(st); |
1402 st->print("("); | |
1403 sig.print_parameters(); | |
1404 st->print(")"); | |
1405 } | |
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1406 #endif // !PRODUCT || INCLUDE_JVMTI |
0 | 1407 |
1408 | |
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1409 //----------------------------------------------------------------------------------- |
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1410 // Non-product code |
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1411 |
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1412 #ifndef PRODUCT |
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1413 void Method::print_codes_on(outputStream* st) const { |
0 | 1414 print_codes_on(0, code_size(), st); |
1415 } | |
1416 | |
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1417 void Method::print_codes_on(int from, int to, outputStream* st) const { |
0 | 1418 Thread *thread = Thread::current(); |
1419 ResourceMark rm(thread); | |
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1420 methodHandle mh (thread, (Method*)this); |
0 | 1421 BytecodeStream s(mh); |
1422 s.set_interval(from, to); | |
1423 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); | |
1424 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); | |
1425 } | |
1426 #endif // not PRODUCT | |
1427 | |
1428 | |
1429 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas | |
1430 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) | |
1431 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used | |
1432 // as end-of-stream terminator. | |
1433 | |
1434 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { | |
1435 // bci and line number does not compress into single byte. | |
1436 // Write out escape character and use regular compression for bci and line number. | |
1437 write_byte((jubyte)0xFF); | |
1438 write_signed_int(bci_delta); | |
1439 write_signed_int(line_delta); | |
1440 } | |
1441 | |
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1442 // See comment in method.hpp which explains why this exists. |
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1443 #if defined(_M_AMD64) && _MSC_VER >= 1400 |
0 | 1444 #pragma optimize("", off) |
1445 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { | |
1446 write_pair_inline(bci, line); | |
1447 } | |
1448 #pragma optimize("", on) | |
1449 #endif | |
1450 | |
1451 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { | |
1452 _bci = 0; | |
1453 _line = 0; | |
1454 }; | |
1455 | |
1456 | |
1457 bool CompressedLineNumberReadStream::read_pair() { | |
1458 jubyte next = read_byte(); | |
1459 // Check for terminator | |
1460 if (next == 0) return false; | |
1461 if (next == 0xFF) { | |
1462 // Escape character, regular compression used | |
1463 _bci += read_signed_int(); | |
1464 _line += read_signed_int(); | |
1465 } else { | |
1466 // Single byte compression used | |
1467 _bci += next >> 3; | |
1468 _line += next & 0x7; | |
1469 } | |
1470 return true; | |
1471 } | |
1472 | |
1473 | |
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1474 Bytecodes::Code Method::orig_bytecode_at(int bci) const { |
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1475 BreakpointInfo* bp = method_holder()->breakpoints(); |
0 | 1476 for (; bp != NULL; bp = bp->next()) { |
1477 if (bp->match(this, bci)) { | |
1478 return bp->orig_bytecode(); | |
1479 } | |
1480 } | |
1481 ShouldNotReachHere(); | |
1482 return Bytecodes::_shouldnotreachhere; | |
1483 } | |
1484 | |
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1485 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { |
0 | 1486 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); |
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1487 BreakpointInfo* bp = method_holder()->breakpoints(); |
0 | 1488 for (; bp != NULL; bp = bp->next()) { |
1489 if (bp->match(this, bci)) { | |
1490 bp->set_orig_bytecode(code); | |
1491 // and continue, in case there is more than one | |
1492 } | |
1493 } | |
1494 } | |
1495 | |
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1496 void Method::set_breakpoint(int bci) { |
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1497 InstanceKlass* ik = method_holder(); |
0 | 1498 BreakpointInfo *bp = new BreakpointInfo(this, bci); |
1499 bp->set_next(ik->breakpoints()); | |
1500 ik->set_breakpoints(bp); | |
1501 // do this last: | |
1502 bp->set(this); | |
1503 } | |
1504 | |
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1505 static void clear_matches(Method* m, int bci) { |
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1506 InstanceKlass* ik = m->method_holder(); |
0 | 1507 BreakpointInfo* prev_bp = NULL; |
1508 BreakpointInfo* next_bp; | |
1509 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { | |
1510 next_bp = bp->next(); | |
1511 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). | |
1512 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { | |
1513 // do this first: | |
1514 bp->clear(m); | |
1515 // unhook it | |
1516 if (prev_bp != NULL) | |
1517 prev_bp->set_next(next_bp); | |
1518 else | |
1519 ik->set_breakpoints(next_bp); | |
1520 delete bp; | |
1521 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods | |
1522 // at same location. So we have multiple matching (method_index and bci) | |
1523 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one | |
1524 // breakpoint for clear_breakpoint request and keep all other method versions | |
1525 // BreakpointInfo for future clear_breakpoint request. | |
1526 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) | |
1527 // which is being called when class is unloaded. We delete all the Breakpoint | |
1528 // information for all versions of method. We may not correctly restore the original | |
1529 // bytecode in all method versions, but that is ok. Because the class is being unloaded | |
1530 // so these methods won't be used anymore. | |
1531 if (bci >= 0) { | |
1532 break; | |
1533 } | |
1534 } else { | |
1535 // This one is a keeper. | |
1536 prev_bp = bp; | |
1537 } | |
1538 } | |
1539 } | |
1540 | |
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1541 void Method::clear_breakpoint(int bci) { |
0 | 1542 assert(bci >= 0, ""); |
1543 clear_matches(this, bci); | |
1544 } | |
1545 | |
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1546 void Method::clear_all_breakpoints() { |
0 | 1547 clear_matches(this, -1); |
1548 } | |
1549 | |
1550 | |
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1551 int Method::invocation_count() { |
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1552 MethodCounters *mcs = method_counters(); |
1783 | 1553 if (TieredCompilation) { |
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1554 MethodData* const mdo = method_data(); |
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1555 if (((mcs != NULL) ? mcs->invocation_counter()->carry() : false) || |
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1556 ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { |
1783 | 1557 return InvocationCounter::count_limit; |
1558 } else { | |
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1559 return ((mcs != NULL) ? mcs->invocation_counter()->count() : 0) + |
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1560 ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); |
1783 | 1561 } |
1562 } else { | |
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1563 return (mcs == NULL) ? 0 : mcs->invocation_counter()->count(); |
1783 | 1564 } |
1565 } | |
1566 | |
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1567 int Method::backedge_count() { |
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1568 MethodCounters *mcs = method_counters(); |
1783 | 1569 if (TieredCompilation) { |
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1570 MethodData* const mdo = method_data(); |
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1571 if (((mcs != NULL) ? mcs->backedge_counter()->carry() : false) || |
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1572 ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { |
1783 | 1573 return InvocationCounter::count_limit; |
1574 } else { | |
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1575 return ((mcs != NULL) ? mcs->backedge_counter()->count() : 0) + |
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1576 ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); |
1783 | 1577 } |
1578 } else { | |
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1579 return (mcs == NULL) ? 0 : mcs->backedge_counter()->count(); |
1783 | 1580 } |
1581 } | |
1582 | |
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1583 int Method::highest_comp_level() const { |
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1584 MethodData* mdo = method_data(); |
1783 | 1585 if (mdo != NULL) { |
1586 return mdo->highest_comp_level(); | |
1587 } else { | |
1588 return CompLevel_none; | |
1589 } | |
1590 } | |
1591 | |
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1592 int Method::highest_osr_comp_level() const { |
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1593 MethodData* mdo = method_data(); |
1783 | 1594 if (mdo != NULL) { |
1595 return mdo->highest_osr_comp_level(); | |
1596 } else { | |
1597 return CompLevel_none; | |
1598 } | |
1599 } | |
1600 | |
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1601 void Method::set_highest_comp_level(int level) { |
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1602 MethodData* mdo = method_data(); |
1783 | 1603 if (mdo != NULL) { |
1604 mdo->set_highest_comp_level(level); | |
1605 } | |
1606 } | |
1607 | |
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1608 void Method::set_highest_osr_comp_level(int level) { |
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1609 MethodData* mdo = method_data(); |
1783 | 1610 if (mdo != NULL) { |
1611 mdo->set_highest_osr_comp_level(level); | |
1612 } | |
1613 } | |
1614 | |
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1615 BreakpointInfo::BreakpointInfo(Method* m, int bci) { |
0 | 1616 _bci = bci; |
1617 _name_index = m->name_index(); | |
1618 _signature_index = m->signature_index(); | |
1619 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); | |
1620 if (_orig_bytecode == Bytecodes::_breakpoint) | |
1621 _orig_bytecode = m->orig_bytecode_at(_bci); | |
1622 _next = NULL; | |
1623 } | |
1624 | |
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1625 void BreakpointInfo::set(Method* method) { |
0 | 1626 #ifdef ASSERT |
1627 { | |
1628 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); | |
1629 if (code == Bytecodes::_breakpoint) | |
1630 code = method->orig_bytecode_at(_bci); | |
1631 assert(orig_bytecode() == code, "original bytecode must be the same"); | |
1632 } | |
1633 #endif | |
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1634 Thread *thread = Thread::current(); |
0 | 1635 *method->bcp_from(_bci) = Bytecodes::_breakpoint; |
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1636 method->incr_number_of_breakpoints(thread); |
0 | 1637 SystemDictionary::notice_modification(); |
1638 { | |
1639 // Deoptimize all dependents on this method | |
1640 HandleMark hm(thread); | |
1641 methodHandle mh(thread, method); | |
1642 Universe::flush_dependents_on_method(mh); | |
1643 } | |
1644 } | |
1645 | |
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1646 void BreakpointInfo::clear(Method* method) { |
0 | 1647 *method->bcp_from(_bci) = orig_bytecode(); |
1648 assert(method->number_of_breakpoints() > 0, "must not go negative"); | |
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1649 method->decr_number_of_breakpoints(Thread::current()); |
0 | 1650 } |
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1651 |
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1652 // jmethodID handling |
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1653 |
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1654 // This is a block allocating object, sort of like JNIHandleBlock, only a |
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1655 // lot simpler. There aren't many of these, they aren't long, they are rarely |
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1656 // deleted and so we can do some suboptimal things. |
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1657 // It's allocated on the CHeap because once we allocate a jmethodID, we can |
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1658 // never get rid of it. |
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1659 // It would be nice to be able to parameterize the number of methods for |
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1660 // the null_class_loader but then we'd have to turn this and ClassLoaderData |
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1661 // into templates. |
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1662 |
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1663 // I feel like this brain dead class should exist somewhere in the STL |
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1664 |
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1665 class JNIMethodBlock : public CHeapObj<mtClass> { |
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1666 enum { number_of_methods = 8 }; |
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1667 |
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1668 Method* _methods[number_of_methods]; |
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1669 int _top; |
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1670 JNIMethodBlock* _next; |
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1671 public: |
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1672 static Method* const _free_method; |
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1673 |
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1674 JNIMethodBlock() : _next(NULL), _top(0) { |
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1675 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; |
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1676 } |
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1677 |
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1678 Method** add_method(Method* m) { |
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1679 if (_top < number_of_methods) { |
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1680 // top points to the next free entry. |
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1681 int i = _top; |
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1682 _methods[i] = m; |
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1683 _top++; |
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1684 return &_methods[i]; |
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1685 } else if (_top == number_of_methods) { |
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1686 // if the next free entry ran off the block see if there's a free entry |
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1687 for (int i = 0; i< number_of_methods; i++) { |
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1688 if (_methods[i] == _free_method) { |
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1689 _methods[i] = m; |
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1690 return &_methods[i]; |
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1691 } |
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1692 } |
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1693 // Only check each block once for frees. They're very unlikely. |
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1694 // Increment top past the end of the block. |
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1695 _top++; |
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1696 } |
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1697 // need to allocate a next block. |
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1698 if (_next == NULL) { |
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1699 _next = new JNIMethodBlock(); |
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1700 } |
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1701 return _next->add_method(m); |
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1702 } |
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1703 |
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1704 bool contains(Method** m) { |
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1705 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1706 for (int i = 0; i< number_of_methods; i++) { |
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1707 if (&(b->_methods[i]) == m) { |
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1708 return true; |
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1709 } |
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1710 } |
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1711 } |
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1712 return false; // not found |
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1713 } |
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1714 |
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1715 // Doesn't really destroy it, just marks it as free so it can be reused. |
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1716 void destroy_method(Method** m) { |
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1717 #ifdef ASSERT |
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1718 assert(contains(m), "should be a methodID"); |
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1719 #endif // ASSERT |
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1720 *m = _free_method; |
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1721 } |
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1722 |
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1723 // During class unloading the methods are cleared, which is different |
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1724 // than freed. |
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1725 void clear_all_methods() { |
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1726 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1727 for (int i = 0; i< number_of_methods; i++) { |
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1728 _methods[i] = NULL; |
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1729 } |
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1730 } |
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1731 } |
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1732 #ifndef PRODUCT |
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1733 int count_methods() { |
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1734 // count all allocated methods |
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1735 int count = 0; |
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1736 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1737 for (int i = 0; i< number_of_methods; i++) { |
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1738 if (_methods[i] != _free_method) count++; |
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1739 } |
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1740 } |
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1741 return count; |
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1742 } |
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1743 #endif // PRODUCT |
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1744 }; |
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1745 |
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1746 // Something that can't be mistaken for an address or a markOop |
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1747 Method* const JNIMethodBlock::_free_method = (Method*)55; |
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1748 |
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1749 // Add a method id to the jmethod_ids |
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1750 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { |
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1751 ClassLoaderData* cld = loader_data; |
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1752 |
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1753 if (!SafepointSynchronize::is_at_safepoint()) { |
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1754 // Have to add jmethod_ids() to class loader data thread-safely. |
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1755 // Also have to add the method to the list safely, which the cld lock |
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1756 // protects as well. |
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1757 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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1758 if (cld->jmethod_ids() == NULL) { |
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1759 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1760 } |
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1761 // jmethodID is a pointer to Method* |
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1762 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1763 } else { |
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1764 // At safepoint, we are single threaded and can set this. |
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1765 if (cld->jmethod_ids() == NULL) { |
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1766 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1767 } |
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1768 // jmethodID is a pointer to Method* |
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1769 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1770 } |
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1771 } |
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1772 |
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1773 // Mark a jmethodID as free. This is called when there is a data race in |
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1774 // InstanceKlass while creating the jmethodID cache. |
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1775 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { |
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1776 ClassLoaderData* cld = loader_data; |
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1777 Method** ptr = (Method**)m; |
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1778 assert(cld->jmethod_ids() != NULL, "should have method handles"); |
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1779 cld->jmethod_ids()->destroy_method(ptr); |
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1780 } |
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1781 |
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1782 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { |
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1783 // Can't assert the method_holder is the same because the new method has the |
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1784 // scratch method holder. |
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1785 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() |
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1786 == new_method->method_holder()->class_loader(), |
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1787 "changing to a different class loader"); |
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1788 // Just change the method in place, jmethodID pointer doesn't change. |
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1789 *((Method**)jmid) = new_method; |
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1790 } |
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1791 |
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1792 bool Method::is_method_id(jmethodID mid) { |
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1793 Method* m = resolve_jmethod_id(mid); |
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1794 assert(m != NULL, "should be called with non-null method"); |
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1795 InstanceKlass* ik = m->method_holder(); |
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1796 ClassLoaderData* cld = ik->class_loader_data(); |
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1797 if (cld->jmethod_ids() == NULL) return false; |
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1798 return (cld->jmethod_ids()->contains((Method**)mid)); |
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1799 } |
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1800 |
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1801 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { |
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1802 if (mid == NULL) return NULL; |
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1803 Method* o = resolve_jmethod_id(mid); |
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1804 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { |
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1805 return NULL; |
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1806 } |
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1807 return o; |
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1808 }; |
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1809 |
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1810 void Method::set_on_stack(const bool value) { |
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1811 // Set both the method itself and its constant pool. The constant pool |
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1812 // on stack means some method referring to it is also on the stack. |
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1813 _access_flags.set_on_stack(value); |
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1814 constants()->set_on_stack(value); |
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1815 if (value) MetadataOnStackMark::record(this); |
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1816 } |
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1817 |
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1818 // Called when the class loader is unloaded to make all methods weak. |
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1819 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { |
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1820 loader_data->jmethod_ids()->clear_all_methods(); |
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1821 } |
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1822 |
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1823 |
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1824 // Check that this pointer is valid by checking that the vtbl pointer matches |
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1825 bool Method::is_valid_method() const { |
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1826 if (this == NULL) { |
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1827 return false; |
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1828 } else if (!is_metaspace_object()) { |
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1829 return false; |
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1830 } else { |
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1831 Method m; |
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1832 // This assumes that the vtbl pointer is the first word of a C++ object. |
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1833 // This assumption is also in universe.cpp patch_klass_vtble |
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1834 void* vtbl2 = dereference_vptr((void*)&m); |
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1835 void* this_vtbl = dereference_vptr((void*)this); |
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1836 return vtbl2 == this_vtbl; |
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1837 } |
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1838 } |
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1839 |
6725
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1840 #ifndef PRODUCT |
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1841 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { |
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1842 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); |
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1843 } |
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1844 #endif // PRODUCT |
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1845 |
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1846 |
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1847 // Printing |
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1848 |
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1849 #ifndef PRODUCT |
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1850 |
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1851 void Method::print_on(outputStream* st) const { |
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1852 ResourceMark rm; |
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1853 assert(is_method(), "must be method"); |
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1854 st->print_cr(internal_name()); |
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1855 // get the effect of PrintOopAddress, always, for methods: |
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1856 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); |
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1857 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); |
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1858 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); |
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1859 constants()->print_value_on(st); st->cr(); |
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1860 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); |
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1861 st->print (" - name: "); name()->print_value_on(st); st->cr(); |
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1862 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); |
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1863 st->print_cr(" - max stack: %d", max_stack()); |
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1864 st->print_cr(" - max locals: %d", max_locals()); |
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1865 st->print_cr(" - size of params: %d", size_of_parameters()); |
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1866 st->print_cr(" - method size: %d", method_size()); |
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1867 if (intrinsic_id() != vmIntrinsics::_none) |
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1868 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); |
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1869 if (highest_comp_level() != CompLevel_none) |
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1870 st->print_cr(" - highest level: %d", highest_comp_level()); |
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1871 st->print_cr(" - vtable index: %d", _vtable_index); |
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1872 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); |
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1873 st->print( " - adapters: "); |
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1874 AdapterHandlerEntry* a = ((Method*)this)->adapter(); |
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1875 if (a == NULL) |
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1876 st->print_cr(INTPTR_FORMAT, a); |
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1877 else |
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1878 a->print_adapter_on(st); |
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1879 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); |
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1880 st->print_cr(" - code size: %d", code_size()); |
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1881 if (code_size() != 0) { |
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1882 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); |
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1883 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); |
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1884 } |
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1885 if (method_data() != NULL) { |
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1886 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); |
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1887 } |
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1888 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); |
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1889 if (checked_exceptions_length() > 0) { |
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1890 CheckedExceptionElement* table = checked_exceptions_start(); |
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1891 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); |
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1892 if (Verbose) { |
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1893 for (int i = 0; i < checked_exceptions_length(); i++) { |
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1894 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); |
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1895 } |
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1896 } |
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1897 } |
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1898 if (has_linenumber_table()) { |
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1899 u_char* table = compressed_linenumber_table(); |
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1900 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); |
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1901 if (Verbose) { |
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1902 CompressedLineNumberReadStream stream(table); |
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1903 while (stream.read_pair()) { |
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1904 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); |
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1905 } |
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1906 } |
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1907 } |
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1908 st->print_cr(" - localvar length: %d", localvariable_table_length()); |
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1909 if (localvariable_table_length() > 0) { |
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1910 LocalVariableTableElement* table = localvariable_table_start(); |
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1911 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); |
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1912 if (Verbose) { |
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1913 for (int i = 0; i < localvariable_table_length(); i++) { |
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1914 int bci = table[i].start_bci; |
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1915 int len = table[i].length; |
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1916 const char* name = constants()->printable_name_at(table[i].name_cp_index); |
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1917 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); |
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1918 int slot = table[i].slot; |
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1919 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); |
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1920 } |
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1921 } |
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1922 } |
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1923 if (code() != NULL) { |
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1924 st->print (" - compiled code: "); |
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1925 code()->print_value_on(st); |
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1926 } |
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1927 if (is_native()) { |
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1928 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); |
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1929 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); |
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1930 } |
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1931 } |
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1932 |
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1933 #endif //PRODUCT |
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1934 |
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1935 void Method::print_value_on(outputStream* st) const { |
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1936 assert(is_method(), "must be method"); |
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1937 st->print_cr(internal_name()); |
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1938 print_address_on(st); |
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1939 st->print(" "); |
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1940 name()->print_value_on(st); |
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1941 st->print(" "); |
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1942 signature()->print_value_on(st); |
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1943 st->print(" in "); |
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1944 method_holder()->print_value_on(st); |
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1945 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); |
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1946 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); |
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1947 } |
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1948 |
7956 | 1949 #if INCLUDE_SERVICES |
1950 // Size Statistics | |
1951 void Method::collect_statistics(KlassSizeStats *sz) const { | |
1952 int mysize = sz->count(this); | |
1953 sz->_method_bytes += mysize; | |
1954 sz->_method_all_bytes += mysize; | |
1955 sz->_rw_bytes += mysize; | |
1956 | |
1957 if (constMethod()) { | |
1958 constMethod()->collect_statistics(sz); | |
1959 } | |
1960 if (method_data()) { | |
1961 method_data()->collect_statistics(sz); | |
1962 } | |
1963 } | |
1964 #endif // INCLUDE_SERVICES | |
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1965 |
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1966 // Verification |
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1967 |
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1968 void Method::verify_on(outputStream* st) { |
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1969 guarantee(is_method(), "object must be method"); |
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1970 guarantee(is_metadata(), "should be metadata"); |
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1971 guarantee(constants()->is_constantPool(), "should be constant pool"); |
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1972 guarantee(constants()->is_metadata(), "should be metadata"); |
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1973 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); |
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1974 guarantee(constMethod()->is_metadata(), "should be metadata"); |
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1975 MethodData* md = method_data(); |
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1976 guarantee(md == NULL || |
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1977 md->is_metadata(), "should be metadata"); |
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1978 guarantee(md == NULL || |
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1979 md->is_methodData(), "should be method data"); |
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1980 } |