Mercurial > hg > graal-compiler
annotate src/share/vm/oops/method.cpp @ 7168:73e64867adb7
8003690: Example code in JVMTI GetStackTrace documentation is broken
Summary: Fixed to minor errors in example code
Reviewed-by: sspitsyn, dholmes
author | mikael |
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date | Wed, 21 Nov 2012 09:02:13 -0800 |
parents | 070d523b96a7 |
children | 2cb439954abf 59c790074993 b2dbd323c668 |
rev | line source |
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0 | 1 /* |
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2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "classfile/systemDictionary.hpp" | |
27 #include "code/debugInfoRec.hpp" | |
28 #include "gc_interface/collectedHeap.inline.hpp" | |
29 #include "interpreter/bytecodeStream.hpp" | |
30 #include "interpreter/bytecodeTracer.hpp" | |
31 #include "interpreter/bytecodes.hpp" | |
32 #include "interpreter/interpreter.hpp" | |
33 #include "interpreter/oopMapCache.hpp" | |
34 #include "memory/gcLocker.hpp" | |
35 #include "memory/generation.hpp" | |
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36 #include "memory/metadataFactory.hpp" |
1972 | 37 #include "memory/oopFactory.hpp" |
6934 | 38 #include "oops/constMethod.hpp" |
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39 #include "oops/methodData.hpp" |
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40 #include "oops/method.hpp" |
1972 | 41 #include "oops/oop.inline.hpp" |
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42 #include "oops/symbol.hpp" |
1972 | 43 #include "prims/jvmtiExport.hpp" |
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44 #include "prims/jvmtiRedefineClasses.hpp" |
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45 #include "prims/methodHandles.hpp" |
1972 | 46 #include "prims/nativeLookup.hpp" |
47 #include "runtime/arguments.hpp" | |
48 #include "runtime/compilationPolicy.hpp" | |
49 #include "runtime/frame.inline.hpp" | |
50 #include "runtime/handles.inline.hpp" | |
51 #include "runtime/relocator.hpp" | |
52 #include "runtime/sharedRuntime.hpp" | |
53 #include "runtime/signature.hpp" | |
3779 | 54 #include "utilities/quickSort.hpp" |
1972 | 55 #include "utilities/xmlstream.hpp" |
0 | 56 |
57 | |
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58 // Implementation of Method |
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59 |
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60 Method* Method::allocate(ClassLoaderData* loader_data, |
6934 | 61 int byte_code_size, |
62 AccessFlags access_flags, | |
63 int compressed_line_number_size, | |
64 int localvariable_table_length, | |
65 int exception_table_length, | |
66 int checked_exceptions_length, | |
67 ConstMethod::MethodType method_type, | |
68 TRAPS) { | |
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69 assert(!access_flags.is_native() || byte_code_size == 0, |
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70 "native methods should not contain byte codes"); |
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71 ConstMethod* cm = ConstMethod::allocate(loader_data, |
6934 | 72 byte_code_size, |
73 compressed_line_number_size, | |
74 localvariable_table_length, | |
75 exception_table_length, | |
76 checked_exceptions_length, | |
77 method_type, | |
78 CHECK_NULL); | |
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79 |
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80 int size = Method::size(access_flags.is_native()); |
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81 |
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82 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size); |
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83 } |
0 | 84 |
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85 Method::Method(ConstMethod* xconst, |
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86 AccessFlags access_flags, int size) { |
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87 No_Safepoint_Verifier no_safepoint; |
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88 set_constMethod(xconst); |
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89 set_access_flags(access_flags); |
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90 set_method_size(size); |
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91 set_name_index(0); |
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92 set_signature_index(0); |
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93 #ifdef CC_INTERP |
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94 set_result_index(T_VOID); |
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95 #endif |
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96 set_constants(NULL); |
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97 set_max_stack(0); |
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98 set_max_locals(0); |
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99 set_intrinsic_id(vmIntrinsics::_none); |
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100 set_jfr_towrite(false); |
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101 set_method_data(NULL); |
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102 set_interpreter_throwout_count(0); |
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103 set_vtable_index(Method::garbage_vtable_index); |
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104 |
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105 // Fix and bury in Method* |
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106 set_interpreter_entry(NULL); // sets i2i entry and from_int |
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107 set_adapter_entry(NULL); |
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108 clear_code(); // from_c/from_i get set to c2i/i2i |
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109 |
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110 if (access_flags.is_native()) { |
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111 clear_native_function(); |
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112 set_signature_handler(NULL); |
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113 } |
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114 |
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115 NOT_PRODUCT(set_compiled_invocation_count(0);) |
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116 set_interpreter_invocation_count(0); |
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117 invocation_counter()->init(); |
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118 backedge_counter()->init(); |
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119 clear_number_of_breakpoints(); |
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120 |
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121 #ifdef TIERED |
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122 set_rate(0); |
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123 set_prev_event_count(0); |
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124 set_prev_time(0); |
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125 #endif |
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126 } |
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127 |
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128 // Release Method*. The nmethod will be gone when we get here because |
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129 // we've walked the code cache. |
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130 void Method::deallocate_contents(ClassLoaderData* loader_data) { |
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131 MetadataFactory::free_metadata(loader_data, constMethod()); |
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132 set_constMethod(NULL); |
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133 MetadataFactory::free_metadata(loader_data, method_data()); |
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134 set_method_data(NULL); |
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135 // The nmethod will be gone when we get here. |
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136 if (code() != NULL) _code = NULL; |
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137 } |
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138 |
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139 address Method::get_i2c_entry() { |
0 | 140 assert(_adapter != NULL, "must have"); |
141 return _adapter->get_i2c_entry(); | |
142 } | |
143 | |
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144 address Method::get_c2i_entry() { |
0 | 145 assert(_adapter != NULL, "must have"); |
146 return _adapter->get_c2i_entry(); | |
147 } | |
148 | |
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149 address Method::get_c2i_unverified_entry() { |
0 | 150 assert(_adapter != NULL, "must have"); |
151 return _adapter->get_c2i_unverified_entry(); | |
152 } | |
153 | |
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154 char* Method::name_and_sig_as_C_string() const { |
6983 | 155 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); |
0 | 156 } |
157 | |
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158 char* Method::name_and_sig_as_C_string(char* buf, int size) const { |
6983 | 159 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); |
0 | 160 } |
161 | |
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162 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { |
0 | 163 const char* klass_name = klass->external_name(); |
164 int klass_name_len = (int)strlen(klass_name); | |
165 int method_name_len = method_name->utf8_length(); | |
166 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); | |
167 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); | |
168 strcpy(dest, klass_name); | |
169 dest[klass_name_len] = '.'; | |
170 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); | |
171 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); | |
172 dest[len] = 0; | |
173 return dest; | |
174 } | |
175 | |
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176 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { |
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177 Symbol* klass_name = klass->name(); |
0 | 178 klass_name->as_klass_external_name(buf, size); |
179 int len = (int)strlen(buf); | |
180 | |
181 if (len < size - 1) { | |
182 buf[len++] = '.'; | |
183 | |
184 method_name->as_C_string(&(buf[len]), size - len); | |
185 len = (int)strlen(buf); | |
186 | |
187 signature->as_C_string(&(buf[len]), size - len); | |
188 } | |
189 | |
190 return buf; | |
191 } | |
192 | |
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193 int Method::fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS) { |
0 | 194 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) |
195 // access exception table | |
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196 ExceptionTable table(this); |
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197 int length = table.length(); |
0 | 198 // iterate through all entries sequentially |
199 constantPoolHandle pool(THREAD, constants()); | |
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200 for (int i = 0; i < length; i ++) { |
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201 //reacquire the table in case a GC happened |
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202 ExceptionTable table(this); |
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203 int beg_bci = table.start_pc(i); |
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204 int end_bci = table.end_pc(i); |
0 | 205 assert(beg_bci <= end_bci, "inconsistent exception table"); |
206 if (beg_bci <= throw_bci && throw_bci < end_bci) { | |
207 // exception handler bci range covers throw_bci => investigate further | |
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208 int handler_bci = table.handler_pc(i); |
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209 int klass_index = table.catch_type_index(i); |
0 | 210 if (klass_index == 0) { |
211 return handler_bci; | |
212 } else if (ex_klass.is_null()) { | |
213 return handler_bci; | |
214 } else { | |
215 // we know the exception class => get the constraint class | |
216 // this may require loading of the constraint class; if verification | |
217 // fails or some other exception occurs, return handler_bci | |
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218 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); |
0 | 219 KlassHandle klass = KlassHandle(THREAD, k); |
220 assert(klass.not_null(), "klass not loaded"); | |
221 if (ex_klass->is_subtype_of(klass())) { | |
222 return handler_bci; | |
223 } | |
224 } | |
225 } | |
226 } | |
227 | |
228 return -1; | |
229 } | |
230 | |
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231 void Method::mask_for(int bci, InterpreterOopMap* mask) { |
0 | 232 |
233 Thread* myThread = Thread::current(); | |
234 methodHandle h_this(myThread, this); | |
235 #ifdef ASSERT | |
236 bool has_capability = myThread->is_VM_thread() || | |
237 myThread->is_ConcurrentGC_thread() || | |
238 myThread->is_GC_task_thread(); | |
239 | |
240 if (!has_capability) { | |
241 if (!VerifyStack && !VerifyLastFrame) { | |
242 // verify stack calls this outside VM thread | |
243 warning("oopmap should only be accessed by the " | |
244 "VM, GC task or CMS threads (or during debugging)"); | |
245 InterpreterOopMap local_mask; | |
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246 method_holder()->mask_for(h_this, bci, &local_mask); |
0 | 247 local_mask.print(); |
248 } | |
249 } | |
250 #endif | |
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251 method_holder()->mask_for(h_this, bci, mask); |
0 | 252 return; |
253 } | |
254 | |
255 | |
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256 int Method::bci_from(address bcp) const { |
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257 #ifdef ASSERT |
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258 { ResourceMark rm; |
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259 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), |
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260 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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261 } |
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262 #endif |
0 | 263 return bcp - code_base(); |
264 } | |
265 | |
266 | |
267 // Return (int)bcx if it appears to be a valid BCI. | |
268 // Return bci_from((address)bcx) if it appears to be a valid BCP. | |
269 // Return -1 otherwise. | |
270 // Used by profiling code, when invalid data is a possibility. | |
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271 // The caller is responsible for validating the Method* itself. |
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272 int Method::validate_bci_from_bcx(intptr_t bcx) const { |
0 | 273 // keep bci as -1 if not a valid bci |
274 int bci = -1; | |
275 if (bcx == 0 || (address)bcx == code_base()) { | |
276 // code_size() may return 0 and we allow 0 here | |
277 // the method may be native | |
278 bci = 0; | |
279 } else if (frame::is_bci(bcx)) { | |
280 if (bcx < code_size()) { | |
281 bci = (int)bcx; | |
282 } | |
283 } else if (contains((address)bcx)) { | |
284 bci = (address)bcx - code_base(); | |
285 } | |
286 // Assert that if we have dodged any asserts, bci is negative. | |
287 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); | |
288 return bci; | |
289 } | |
290 | |
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291 address Method::bcp_from(int bci) const { |
0 | 292 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); |
293 address bcp = code_base() + bci; | |
294 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); | |
295 return bcp; | |
296 } | |
297 | |
298 | |
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299 int Method::size(bool is_native) { |
0 | 300 // If native, then include pointers for native_function and signature_handler |
301 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; | |
302 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; | |
303 return align_object_size(header_size() + extra_words); | |
304 } | |
305 | |
306 | |
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307 Symbol* Method::klass_name() const { |
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308 Klass* k = method_holder(); |
0 | 309 assert(k->is_klass(), "must be klass"); |
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310 InstanceKlass* ik = (InstanceKlass*) k; |
0 | 311 return ik->name(); |
312 } | |
313 | |
314 | |
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315 void Method::set_interpreter_kind() { |
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316 int kind = Interpreter::method_kind(this); |
0 | 317 assert(kind != Interpreter::invalid, |
318 "interpreter entry must be valid"); | |
319 set_interpreter_kind(kind); | |
320 } | |
321 | |
322 | |
323 // Attempt to return method oop to original state. Clear any pointers | |
324 // (to objects outside the shared spaces). We won't be able to predict | |
325 // where they should point in a new JVM. Further initialize some | |
326 // entries now in order allow them to be write protected later. | |
327 | |
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328 void Method::remove_unshareable_info() { |
0 | 329 unlink_method(); |
330 set_interpreter_kind(); | |
331 } | |
332 | |
333 | |
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334 bool Method::was_executed_more_than(int n) { |
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335 // Invocation counter is reset when the Method* is compiled. |
0 | 336 // If the method has compiled code we therefore assume it has |
337 // be excuted more than n times. | |
338 if (is_accessor() || is_empty_method() || (code() != NULL)) { | |
339 // interpreter doesn't bump invocation counter of trivial methods | |
340 // compiler does not bump invocation counter of compiled methods | |
341 return true; | |
1783 | 342 } |
343 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) { | |
0 | 344 // The carry bit is set when the counter overflows and causes |
345 // a compilation to occur. We don't know how many times | |
346 // the counter has been reset, so we simply assume it has | |
347 // been executed more than n times. | |
348 return true; | |
349 } else { | |
350 return invocation_count() > n; | |
351 } | |
352 } | |
353 | |
354 #ifndef PRODUCT | |
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355 void Method::print_invocation_count() { |
0 | 356 if (is_static()) tty->print("static "); |
357 if (is_final()) tty->print("final "); | |
358 if (is_synchronized()) tty->print("synchronized "); | |
359 if (is_native()) tty->print("native "); | |
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360 method_holder()->name()->print_symbol_on(tty); |
0 | 361 tty->print("."); |
362 name()->print_symbol_on(tty); | |
363 signature()->print_symbol_on(tty); | |
364 | |
365 if (WizardMode) { | |
366 // dump the size of the byte codes | |
367 tty->print(" {%d}", code_size()); | |
368 } | |
369 tty->cr(); | |
370 | |
371 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); | |
372 tty->print_cr (" invocation_counter: %8d ", invocation_count()); | |
373 tty->print_cr (" backedge_counter: %8d ", backedge_count()); | |
374 if (CountCompiledCalls) { | |
375 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); | |
376 } | |
377 | |
378 } | |
379 #endif | |
380 | |
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381 // Build a MethodData* object to hold information about this method |
0 | 382 // collected in the interpreter. |
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383 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { |
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384 // Do not profile method if current thread holds the pending list lock, |
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385 // which avoids deadlock for acquiring the MethodData_lock. |
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386 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { |
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387 return; |
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388 } |
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389 |
0 | 390 // Grab a lock here to prevent multiple |
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391 // MethodData*s from being created. |
0 | 392 MutexLocker ml(MethodData_lock, THREAD); |
393 if (method->method_data() == NULL) { | |
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394 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); |
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395 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); |
0 | 396 method->set_method_data(method_data); |
397 if (PrintMethodData && (Verbose || WizardMode)) { | |
398 ResourceMark rm(THREAD); | |
399 tty->print("build_interpreter_method_data for "); | |
400 method->print_name(tty); | |
401 tty->cr(); | |
402 // At the end of the run, the MDO, full of data, will be dumped. | |
403 } | |
404 } | |
405 } | |
406 | |
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407 void Method::cleanup_inline_caches() { |
0 | 408 // The current system doesn't use inline caches in the interpreter |
409 // => nothing to do (keep this method around for future use) | |
410 } | |
411 | |
412 | |
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413 int Method::extra_stack_words() { |
710 | 414 // not an inline function, to avoid a header dependency on Interpreter |
1506 | 415 return extra_stack_entries() * Interpreter::stackElementSize; |
710 | 416 } |
417 | |
418 | |
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419 void Method::compute_size_of_parameters(Thread *thread) { |
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420 ArgumentSizeComputer asc(signature()); |
0 | 421 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); |
422 } | |
423 | |
424 #ifdef CC_INTERP | |
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425 void Method::set_result_index(BasicType type) { |
0 | 426 _result_index = Interpreter::BasicType_as_index(type); |
427 } | |
428 #endif | |
429 | |
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430 BasicType Method::result_type() const { |
0 | 431 ResultTypeFinder rtf(signature()); |
432 return rtf.type(); | |
433 } | |
434 | |
435 | |
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436 bool Method::is_empty_method() const { |
0 | 437 return code_size() == 1 |
438 && *code_base() == Bytecodes::_return; | |
439 } | |
440 | |
441 | |
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442 bool Method::is_vanilla_constructor() const { |
0 | 443 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method |
444 // which only calls the superclass vanilla constructor and possibly does stores of | |
445 // zero constants to local fields: | |
446 // | |
447 // aload_0 | |
448 // invokespecial | |
449 // indexbyte1 | |
450 // indexbyte2 | |
451 // | |
452 // followed by an (optional) sequence of: | |
453 // | |
454 // aload_0 | |
455 // aconst_null / iconst_0 / fconst_0 / dconst_0 | |
456 // putfield | |
457 // indexbyte1 | |
458 // indexbyte2 | |
459 // | |
460 // followed by: | |
461 // | |
462 // return | |
463 | |
464 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); | |
465 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); | |
466 int size = code_size(); | |
467 // Check if size match | |
468 if (size == 0 || size % 5 != 0) return false; | |
469 address cb = code_base(); | |
470 int last = size - 1; | |
471 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { | |
472 // Does not call superclass default constructor | |
473 return false; | |
474 } | |
475 // Check optional sequence | |
476 for (int i = 4; i < last; i += 5) { | |
477 if (cb[i] != Bytecodes::_aload_0) return false; | |
478 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; | |
479 if (cb[i+2] != Bytecodes::_putfield) return false; | |
480 } | |
481 return true; | |
482 } | |
483 | |
484 | |
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485 bool Method::compute_has_loops_flag() { |
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486 BytecodeStream bcs(this); |
0 | 487 Bytecodes::Code bc; |
488 | |
489 while ((bc = bcs.next()) >= 0) { | |
490 switch( bc ) { | |
491 case Bytecodes::_ifeq: | |
492 case Bytecodes::_ifnull: | |
493 case Bytecodes::_iflt: | |
494 case Bytecodes::_ifle: | |
495 case Bytecodes::_ifne: | |
496 case Bytecodes::_ifnonnull: | |
497 case Bytecodes::_ifgt: | |
498 case Bytecodes::_ifge: | |
499 case Bytecodes::_if_icmpeq: | |
500 case Bytecodes::_if_icmpne: | |
501 case Bytecodes::_if_icmplt: | |
502 case Bytecodes::_if_icmpgt: | |
503 case Bytecodes::_if_icmple: | |
504 case Bytecodes::_if_icmpge: | |
505 case Bytecodes::_if_acmpeq: | |
506 case Bytecodes::_if_acmpne: | |
507 case Bytecodes::_goto: | |
508 case Bytecodes::_jsr: | |
509 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
510 break; | |
511 | |
512 case Bytecodes::_goto_w: | |
513 case Bytecodes::_jsr_w: | |
514 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
515 break; | |
516 } | |
517 } | |
518 _access_flags.set_loops_flag_init(); | |
519 return _access_flags.has_loops(); | |
520 } | |
521 | |
522 | |
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523 bool Method::is_final_method() const { |
0 | 524 // %%% Should return true for private methods also, |
525 // since there is no way to override them. | |
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526 return is_final() || method_holder()->is_final(); |
0 | 527 } |
528 | |
529 | |
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530 bool Method::is_strict_method() const { |
0 | 531 return is_strict(); |
532 } | |
533 | |
534 | |
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535 bool Method::can_be_statically_bound() const { |
0 | 536 if (is_final_method()) return true; |
537 return vtable_index() == nonvirtual_vtable_index; | |
538 } | |
539 | |
540 | |
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541 bool Method::is_accessor() const { |
0 | 542 if (code_size() != 5) return false; |
543 if (size_of_parameters() != 1) return false; | |
2142 | 544 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; |
545 if (java_code_at(1) != Bytecodes::_getfield) return false; | |
546 if (java_code_at(4) != Bytecodes::_areturn && | |
547 java_code_at(4) != Bytecodes::_ireturn ) return false; | |
0 | 548 return true; |
549 } | |
550 | |
551 | |
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552 bool Method::is_initializer() const { |
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553 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); |
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554 } |
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555 |
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556 bool Method::has_valid_initializer_flags() const { |
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557 return (is_static() || |
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558 method_holder()->major_version() < 51); |
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559 } |
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560 |
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561 bool Method::is_static_initializer() const { |
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562 // For classfiles version 51 or greater, ensure that the clinit method is |
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563 // static. Non-static methods with the name "<clinit>" are not static |
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564 // initializers. (older classfiles exempted for backward compatibility) |
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565 return name() == vmSymbols::class_initializer_name() && |
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566 has_valid_initializer_flags(); |
0 | 567 } |
568 | |
569 | |
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570 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { |
0 | 571 int length = this_oop->checked_exceptions_length(); |
572 if (length == 0) { // common case | |
573 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); | |
574 } else { | |
575 methodHandle h_this(THREAD, this_oop); | |
1142 | 576 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); |
0 | 577 objArrayHandle mirrors (THREAD, m_oop); |
578 for (int i = 0; i < length; i++) { | |
579 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe | |
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580 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); |
6983 | 581 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); |
582 mirrors->obj_at_put(i, k->java_mirror()); | |
0 | 583 } |
584 return mirrors; | |
585 } | |
586 }; | |
587 | |
588 | |
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589 int Method::line_number_from_bci(int bci) const { |
0 | 590 if (bci == SynchronizationEntryBCI) bci = 0; |
591 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); | |
592 int best_bci = 0; | |
593 int best_line = -1; | |
594 | |
595 if (has_linenumber_table()) { | |
596 // The line numbers are a short array of 2-tuples [start_pc, line_number]. | |
597 // Not necessarily sorted and not necessarily one-to-one. | |
598 CompressedLineNumberReadStream stream(compressed_linenumber_table()); | |
599 while (stream.read_pair()) { | |
600 if (stream.bci() == bci) { | |
601 // perfect match | |
602 return stream.line(); | |
603 } else { | |
604 // update best_bci/line | |
605 if (stream.bci() < bci && stream.bci() >= best_bci) { | |
606 best_bci = stream.bci(); | |
607 best_line = stream.line(); | |
608 } | |
609 } | |
610 } | |
611 } | |
612 return best_line; | |
613 } | |
614 | |
615 | |
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616 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { |
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617 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { |
0 | 618 Thread *thread = Thread::current(); |
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619 Symbol* klass_name = constants()->klass_name_at(klass_index); |
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620 Handle loader(thread, method_holder()->class_loader()); |
6983 | 621 Handle prot (thread, method_holder()->protection_domain()); |
0 | 622 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; |
623 } else { | |
624 return true; | |
625 } | |
626 } | |
627 | |
628 | |
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629 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { |
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630 int klass_index = constants()->klass_ref_index_at(refinfo_index); |
0 | 631 if (must_be_resolved) { |
632 // Make sure klass is resolved in constantpool. | |
633 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; | |
634 } | |
635 return is_klass_loaded_by_klass_index(klass_index); | |
636 } | |
637 | |
638 | |
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639 void Method::set_native_function(address function, bool post_event_flag) { |
0 | 640 assert(function != NULL, "use clear_native_function to unregister natives"); |
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641 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); |
0 | 642 address* native_function = native_function_addr(); |
643 | |
644 // We can see racers trying to place the same native function into place. Once | |
645 // is plenty. | |
646 address current = *native_function; | |
647 if (current == function) return; | |
648 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && | |
649 function != NULL) { | |
650 // native_method_throw_unsatisfied_link_error_entry() should only | |
651 // be passed when post_event_flag is false. | |
652 assert(function != | |
653 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
654 "post_event_flag mis-match"); | |
655 | |
656 // post the bind event, and possible change the bind function | |
657 JvmtiExport::post_native_method_bind(this, &function); | |
658 } | |
659 *native_function = function; | |
660 // This function can be called more than once. We must make sure that we always | |
661 // use the latest registered method -> check if a stub already has been generated. | |
662 // If so, we have to make it not_entrant. | |
663 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates | |
664 if (nm != NULL) { | |
665 nm->make_not_entrant(); | |
666 } | |
667 } | |
668 | |
669 | |
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670 bool Method::has_native_function() const { |
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671 if (is_method_handle_intrinsic()) |
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672 return false; // special-cased in SharedRuntime::generate_native_wrapper |
0 | 673 address func = native_function(); |
674 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); | |
675 } | |
676 | |
677 | |
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678 void Method::clear_native_function() { |
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679 // Note: is_method_handle_intrinsic() is allowed here. |
0 | 680 set_native_function( |
681 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
682 !native_bind_event_is_interesting); | |
683 clear_code(); | |
684 } | |
685 | |
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686 address Method::critical_native_function() { |
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687 methodHandle mh(this); |
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688 return NativeLookup::lookup_critical_entry(mh); |
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689 } |
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690 |
0 | 691 |
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692 void Method::set_signature_handler(address handler) { |
0 | 693 address* signature_handler = signature_handler_addr(); |
694 *signature_handler = handler; | |
695 } | |
696 | |
697 | |
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698 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report) { |
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699 if (PrintCompilation && report) { |
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700 ttyLocker ttyl; |
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701 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); |
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702 if (comp_level == CompLevel_all) { |
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703 tty->print("all levels "); |
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704 } else { |
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705 tty->print("levels "); |
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706 for (int i = (int)CompLevel_none; i <= comp_level; i++) { |
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707 tty->print("%d ", i); |
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708 } |
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709 } |
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710 this->print_short_name(tty); |
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711 int size = this->code_size(); |
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712 if (size > 0) |
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713 tty->print(" (%d bytes)", size); |
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714 tty->cr(); |
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715 } |
0 | 716 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { |
717 ttyLocker ttyl; | |
6843 | 718 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", |
719 is_osr ? "osr_" : "", os::current_thread_id()); | |
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720 xtty->method(this); |
0 | 721 xtty->stamp(); |
722 xtty->end_elem(); | |
723 } | |
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724 } |
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725 |
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726 bool Method::is_not_compilable(int comp_level) const { |
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727 if (number_of_breakpoints() > 0) |
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728 return true; |
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729 if (is_method_handle_intrinsic()) |
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730 return !is_synthetic(); // the generated adapters must be compiled |
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731 if (comp_level == CompLevel_any) |
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732 return is_not_c1_compilable() || is_not_c2_compilable(); |
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733 if (is_c1_compile(comp_level)) |
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734 return is_not_c1_compilable(); |
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735 if (is_c2_compile(comp_level)) |
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736 return is_not_c2_compilable(); |
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737 return false; |
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738 } |
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739 |
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740 // call this when compiler finds that this method is not compilable |
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741 void Method::set_not_compilable(int comp_level, bool report) { |
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742 print_made_not_compilable(comp_level, /*is_osr*/ false, report); |
1783 | 743 if (comp_level == CompLevel_all) { |
744 set_not_c1_compilable(); | |
745 set_not_c2_compilable(); | |
746 } else { | |
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747 if (is_c1_compile(comp_level)) |
1783 | 748 set_not_c1_compilable(); |
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749 if (is_c2_compile(comp_level)) |
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750 set_not_c2_compilable(); |
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751 } |
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752 CompilationPolicy::policy()->disable_compilation(this); |
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753 } |
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754 |
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755 bool Method::is_not_osr_compilable(int comp_level) const { |
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756 if (is_not_compilable(comp_level)) |
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757 return true; |
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758 if (comp_level == CompLevel_any) |
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759 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); |
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760 if (is_c1_compile(comp_level)) |
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761 return is_not_c1_osr_compilable(); |
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762 if (is_c2_compile(comp_level)) |
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763 return is_not_c2_osr_compilable(); |
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764 return false; |
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765 } |
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766 |
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767 void Method::set_not_osr_compilable(int comp_level, bool report) { |
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768 print_made_not_compilable(comp_level, /*is_osr*/ true, report); |
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769 if (comp_level == CompLevel_all) { |
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770 set_not_c1_osr_compilable(); |
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771 set_not_c2_osr_compilable(); |
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772 } else { |
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773 if (is_c1_compile(comp_level)) |
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774 set_not_c1_osr_compilable(); |
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775 if (is_c2_compile(comp_level)) |
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776 set_not_c2_osr_compilable(); |
0 | 777 } |
1783 | 778 CompilationPolicy::policy()->disable_compilation(this); |
0 | 779 } |
780 | |
781 // Revert to using the interpreter and clear out the nmethod | |
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782 void Method::clear_code() { |
0 | 783 |
784 // this may be NULL if c2i adapters have not been made yet | |
785 // Only should happen at allocate time. | |
786 if (_adapter == NULL) { | |
787 _from_compiled_entry = NULL; | |
788 } else { | |
789 _from_compiled_entry = _adapter->get_c2i_entry(); | |
790 } | |
791 OrderAccess::storestore(); | |
792 _from_interpreted_entry = _i2i_entry; | |
793 OrderAccess::storestore(); | |
794 _code = NULL; | |
795 } | |
796 | |
797 // Called by class data sharing to remove any entry points (which are not shared) | |
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798 void Method::unlink_method() { |
0 | 799 _code = NULL; |
800 _i2i_entry = NULL; | |
801 _from_interpreted_entry = NULL; | |
802 if (is_native()) { | |
803 *native_function_addr() = NULL; | |
804 set_signature_handler(NULL); | |
805 } | |
806 NOT_PRODUCT(set_compiled_invocation_count(0);) | |
807 invocation_counter()->reset(); | |
808 backedge_counter()->reset(); | |
809 _adapter = NULL; | |
810 _from_compiled_entry = NULL; | |
811 assert(_method_data == NULL, "unexpected method data?"); | |
812 set_method_data(NULL); | |
813 set_interpreter_throwout_count(0); | |
814 set_interpreter_invocation_count(0); | |
815 } | |
816 | |
817 // Called when the method_holder is getting linked. Setup entrypoints so the method | |
818 // is ready to be called from interpreter, compiler, and vtables. | |
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819 void Method::link_method(methodHandle h_method, TRAPS) { |
3748 | 820 // If the code cache is full, we may reenter this function for the |
821 // leftover methods that weren't linked. | |
822 if (_i2i_entry != NULL) return; | |
823 | |
0 | 824 assert(_adapter == NULL, "init'd to NULL" ); |
825 assert( _code == NULL, "nothing compiled yet" ); | |
826 | |
827 // Setup interpreter entrypoint | |
828 assert(this == h_method(), "wrong h_method()" ); | |
829 address entry = Interpreter::entry_for_method(h_method); | |
830 assert(entry != NULL, "interpreter entry must be non-null"); | |
831 // Sets both _i2i_entry and _from_interpreted_entry | |
832 set_interpreter_entry(entry); | |
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833 if (is_native() && !is_method_handle_intrinsic()) { |
0 | 834 set_native_function( |
835 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
836 !native_bind_event_is_interesting); | |
837 } | |
838 | |
839 // Setup compiler entrypoint. This is made eagerly, so we do not need | |
840 // special handling of vtables. An alternative is to make adapters more | |
841 // lazily by calling make_adapter() from from_compiled_entry() for the | |
842 // normal calls. For vtable calls life gets more complicated. When a | |
843 // call-site goes mega-morphic we need adapters in all methods which can be | |
844 // called from the vtable. We need adapters on such methods that get loaded | |
845 // later. Ditto for mega-morphic itable calls. If this proves to be a | |
846 // problem we'll make these lazily later. | |
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847 (void) make_adapters(h_method, CHECK); |
0 | 848 |
849 // ONLY USE the h_method now as make_adapter may have blocked | |
850 | |
851 } | |
852 | |
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853 address Method::make_adapters(methodHandle mh, TRAPS) { |
0 | 854 // Adapters for compiled code are made eagerly here. They are fairly |
855 // small (generally < 100 bytes) and quick to make (and cached and shared) | |
856 // so making them eagerly shouldn't be too expensive. | |
857 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); | |
858 if (adapter == NULL ) { | |
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859 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); |
0 | 860 } |
861 | |
862 mh->set_adapter_entry(adapter); | |
863 mh->_from_compiled_entry = adapter->get_c2i_entry(); | |
864 return adapter->get_c2i_entry(); | |
865 } | |
866 | |
867 // The verified_code_entry() must be called when a invoke is resolved | |
868 // on this method. | |
869 | |
870 // It returns the compiled code entry point, after asserting not null. | |
871 // This function is called after potential safepoints so that nmethod | |
872 // or adapter that it points to is still live and valid. | |
873 // This function must not hit a safepoint! | |
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874 address Method::verified_code_entry() { |
0 | 875 debug_only(No_Safepoint_Verifier nsv;) |
1202 | 876 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); |
877 if (code == NULL && UseCodeCacheFlushing) { | |
878 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); | |
879 if (saved_code != NULL) { | |
880 methodHandle method(this); | |
881 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); | |
882 set_code( method, saved_code ); | |
883 } | |
884 } | |
885 | |
0 | 886 assert(_from_compiled_entry != NULL, "must be set"); |
887 return _from_compiled_entry; | |
888 } | |
889 | |
890 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all | |
891 // (could be racing a deopt). | |
892 // Not inline to avoid circular ref. | |
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893 bool Method::check_code() const { |
0 | 894 // cached in a register or local. There's a race on the value of the field. |
895 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); | |
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896 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); |
0 | 897 } |
898 | |
899 // Install compiled code. Instantly it can execute. | |
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900 void Method::set_code(methodHandle mh, nmethod *code) { |
0 | 901 assert( code, "use clear_code to remove code" ); |
902 assert( mh->check_code(), "" ); | |
903 | |
904 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); | |
905 | |
906 // These writes must happen in this order, because the interpreter will | |
907 // directly jump to from_interpreted_entry which jumps to an i2c adapter | |
908 // which jumps to _from_compiled_entry. | |
909 mh->_code = code; // Assign before allowing compiled code to exec | |
910 | |
911 int comp_level = code->comp_level(); | |
912 // In theory there could be a race here. In practice it is unlikely | |
913 // and not worth worrying about. | |
1783 | 914 if (comp_level > mh->highest_comp_level()) { |
915 mh->set_highest_comp_level(comp_level); | |
0 | 916 } |
917 | |
918 OrderAccess::storestore(); | |
1692 | 919 #ifdef SHARK |
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920 mh->_from_interpreted_entry = code->insts_begin(); |
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921 #else //!SHARK |
0 | 922 mh->_from_compiled_entry = code->verified_entry_point(); |
923 OrderAccess::storestore(); | |
924 // Instantly compiled code can execute. | |
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925 if (!mh->is_method_handle_intrinsic()) |
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926 mh->_from_interpreted_entry = mh->get_i2c_entry(); |
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927 #endif //!SHARK |
0 | 928 } |
929 | |
930 | |
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931 bool Method::is_overridden_in(Klass* k) const { |
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932 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 933 |
934 if (ik->is_interface()) return false; | |
935 | |
936 // If method is an interface, we skip it - except if it | |
937 // is a miranda method | |
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938 if (method_holder()->is_interface()) { |
0 | 939 // Check that method is not a miranda method |
940 if (ik->lookup_method(name(), signature()) == NULL) { | |
941 // No implementation exist - so miranda method | |
942 return false; | |
943 } | |
944 return true; | |
945 } | |
946 | |
947 assert(ik->is_subclass_of(method_holder()), "should be subklass"); | |
948 assert(ik->vtable() != NULL, "vtable should exist"); | |
949 if (vtable_index() == nonvirtual_vtable_index) { | |
950 return false; | |
951 } else { | |
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952 Method* vt_m = ik->method_at_vtable(vtable_index()); |
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953 return vt_m != this; |
0 | 954 } |
955 } | |
956 | |
957 | |
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958 // give advice about whether this Method* should be cached or not |
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959 bool Method::should_not_be_cached() const { |
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960 if (is_old()) { |
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961 // This method has been redefined. It is either EMCP or obsolete |
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962 // and we don't want to cache it because that would pin the method |
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963 // down and prevent it from being collectible if and when it |
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964 // finishes executing. |
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965 return true; |
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966 } |
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967 |
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968 // caching this method should be just fine |
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969 return false; |
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970 } |
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971 |
710 | 972 // Constant pool structure for invoke methods: |
973 enum { | |
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974 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. |
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975 _imcp_invoke_signature, // utf8: (variable Symbol*) |
710 | 976 _imcp_limit |
977 }; | |
978 | |
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979 // Test if this method is an MH adapter frame generated by Java code. |
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980 // Cf. java/lang/invoke/InvokerBytecodeGenerator |
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981 bool Method::is_compiled_lambda_form() const { |
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982 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; |
710 | 983 } |
984 | |
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985 // Test if this method is an internal MH primitive method. |
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986 bool Method::is_method_handle_intrinsic() const { |
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987 vmIntrinsics::ID iid = intrinsic_id(); |
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988 return (MethodHandles::is_signature_polymorphic(iid) && |
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989 MethodHandles::is_signature_polymorphic_intrinsic(iid)); |
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990 } |
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991 |
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992 bool Method::has_member_arg() const { |
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993 vmIntrinsics::ID iid = intrinsic_id(); |
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994 return (MethodHandles::is_signature_polymorphic(iid) && |
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995 MethodHandles::has_member_arg(iid)); |
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996 } |
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997 |
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998 // Make an instance of a signature-polymorphic internal MH primitive. |
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999 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, |
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1000 Symbol* signature, |
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1001 TRAPS) { |
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1002 ResourceMark rm; |
710 | 1003 methodHandle empty; |
1004 | |
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1005 KlassHandle holder = SystemDictionary::MethodHandle_klass(); |
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1006 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); |
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1007 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); |
710 | 1008 if (TraceMethodHandles) { |
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1009 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); |
710 | 1010 } |
1011 | |
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1012 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) |
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1013 name->increment_refcount(); |
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1014 signature->increment_refcount(); |
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1015 |
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1016 int cp_length = _imcp_limit; |
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1017 ClassLoaderData* loader_data = holder->class_loader_data(); |
710 | 1018 constantPoolHandle cp; |
1019 { | |
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1020 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); |
710 | 1021 cp = constantPoolHandle(THREAD, cp_oop); |
1022 } | |
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1023 cp->set_pool_holder(InstanceKlass::cast(holder())); |
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1024 cp->symbol_at_put(_imcp_invoke_name, name); |
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1025 cp->symbol_at_put(_imcp_invoke_signature, signature); |
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1026 cp->set_preresolution(); |
710 | 1027 |
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1028 // decide on access bits: public or not? |
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1029 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); |
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1030 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); |
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1031 if (must_be_static) flags_bits |= JVM_ACC_STATIC; |
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1032 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); |
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1033 |
710 | 1034 methodHandle m; |
1035 { | |
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1036 Method* m_oop = Method::allocate(loader_data, 0, accessFlags_from(flags_bits), |
6934 | 1037 0, 0, 0, 0, ConstMethod::NORMAL, CHECK_(empty)); |
710 | 1038 m = methodHandle(THREAD, m_oop); |
1039 } | |
1040 m->set_constants(cp()); | |
1041 m->set_name_index(_imcp_invoke_name); | |
1042 m->set_signature_index(_imcp_invoke_signature); | |
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1043 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); |
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1044 assert(m->signature() == signature, ""); |
710 | 1045 #ifdef CC_INTERP |
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1046 ResultTypeFinder rtf(signature); |
710 | 1047 m->set_result_index(rtf.type()); |
1048 #endif | |
1049 m->compute_size_of_parameters(THREAD); | |
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1050 m->init_intrinsic_id(); |
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1051 assert(m->is_method_handle_intrinsic(), ""); |
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1052 #ifdef ASSERT |
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1053 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); |
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1054 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); |
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1055 assert(m->intrinsic_id() == iid, "correctly predicted iid"); |
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1056 #endif //ASSERT |
710 | 1057 |
1058 // Finally, set up its entry points. | |
1059 assert(m->can_be_statically_bound(), ""); | |
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1060 m->set_vtable_index(Method::nonvirtual_vtable_index); |
710 | 1061 m->link_method(m, CHECK_(empty)); |
1062 | |
1039
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1063 if (TraceMethodHandles && (Verbose || WizardMode)) |
710 | 1064 m->print_on(tty); |
1065 | |
1066 return m; | |
1067 } | |
1068 | |
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1069 Klass* Method::check_non_bcp_klass(Klass* klass) { |
6983 | 1070 if (klass != NULL && klass->class_loader() != NULL) { |
1071 if (klass->oop_is_objArray()) | |
6831
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1072 klass = ObjArrayKlass::cast(klass)->bottom_klass(); |
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1073 return klass; |
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1074 } |
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1075 return NULL; |
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1076 } |
710 | 1077 |
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1078 |
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1079 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, |
0 | 1080 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { |
1081 // Code below does not work for native methods - they should never get rewritten anyway | |
1082 assert(!m->is_native(), "cannot rewrite native methods"); | |
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1083 // Allocate new Method* |
0 | 1084 AccessFlags flags = m->access_flags(); |
1085 int checked_exceptions_len = m->checked_exceptions_length(); | |
1086 int localvariable_len = m->localvariable_table_length(); | |
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1087 int exception_table_len = m->exception_table_length(); |
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1088 |
6934 | 1089 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); |
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1090 Method* newm_oop = Method::allocate(loader_data, |
6934 | 1091 new_code_length, |
1092 flags, | |
1093 new_compressed_linenumber_size, | |
1094 localvariable_len, | |
1095 exception_table_len, | |
1096 checked_exceptions_len, | |
1097 m->method_type(), | |
1098 CHECK_(methodHandle())); | |
0 | 1099 methodHandle newm (THREAD, newm_oop); |
1100 int new_method_size = newm->method_size(); | |
518
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1101 |
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1102 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* |
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1103 ConstMethod* newcm = newm->constMethod(); |
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1104 int new_const_method_size = newm->constMethod()->size(); |
2226
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1105 |
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1106 memcpy(newm(), m(), sizeof(Method)); |
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1107 |
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1108 // Create shallow copy of ConstMethod. |
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1109 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); |
2226
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1110 |
0 | 1111 // Reset correct method/const method, method size, and parameter info |
1112 newm->set_constMethod(newcm); | |
1113 newm->constMethod()->set_code_size(new_code_length); | |
1114 newm->constMethod()->set_constMethod_size(new_const_method_size); | |
1115 newm->set_method_size(new_method_size); | |
1116 assert(newm->code_size() == new_code_length, "check"); | |
1117 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); | |
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1118 assert(newm->exception_table_length() == exception_table_len, "check"); |
0 | 1119 assert(newm->localvariable_table_length() == localvariable_len, "check"); |
1120 // Copy new byte codes | |
1121 memcpy(newm->code_base(), new_code, new_code_length); | |
1122 // Copy line number table | |
1123 if (new_compressed_linenumber_size > 0) { | |
1124 memcpy(newm->compressed_linenumber_table(), | |
1125 new_compressed_linenumber_table, | |
1126 new_compressed_linenumber_size); | |
1127 } | |
1128 // Copy checked_exceptions | |
1129 if (checked_exceptions_len > 0) { | |
1130 memcpy(newm->checked_exceptions_start(), | |
1131 m->checked_exceptions_start(), | |
1132 checked_exceptions_len * sizeof(CheckedExceptionElement)); | |
1133 } | |
6216
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1134 // Copy exception table |
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1135 if (exception_table_len > 0) { |
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1136 memcpy(newm->exception_table_start(), |
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1137 m->exception_table_start(), |
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1138 exception_table_len * sizeof(ExceptionTableElement)); |
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1139 } |
0 | 1140 // Copy local variable number table |
1141 if (localvariable_len > 0) { | |
1142 memcpy(newm->localvariable_table_start(), | |
1143 m->localvariable_table_start(), | |
1144 localvariable_len * sizeof(LocalVariableTableElement)); | |
1145 } | |
6725
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1146 // Copy stackmap table |
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1147 if (m->has_stackmap_table()) { |
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1148 int code_attribute_length = m->stackmap_data()->length(); |
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1149 Array<u1>* stackmap_data = |
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1150 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); |
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1151 memcpy((void*)stackmap_data->adr_at(0), |
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1152 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); |
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1153 newm->set_stackmap_data(stackmap_data); |
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1154 } |
518
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1155 |
0 | 1156 return newm; |
1157 } | |
1158 | |
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1159 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { |
0 | 1160 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics |
1161 // because we are not loading from core libraries | |
6894 | 1162 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar |
1163 // which does not use the class default class loader so we check for its loader here | |
1164 if ((InstanceKlass::cast(holder)->class_loader() != NULL) && | |
1165 InstanceKlass::cast(holder)->class_loader()->klass()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) { | |
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1166 return vmSymbols::NO_SID; // regardless of name, no intrinsics here |
6894 | 1167 } |
0 | 1168 |
1169 // see if the klass name is well-known: | |
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1170 Symbol* klass_name = InstanceKlass::cast(holder)->name(); |
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1171 return vmSymbols::find_sid(klass_name); |
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1172 } |
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1173 |
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1174 void Method::init_intrinsic_id() { |
856
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1175 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); |
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1176 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); |
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1177 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); |
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1178 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); |
856
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1179 |
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1180 // the klass name is well-known: |
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1181 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); |
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1182 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); |
0 | 1183 |
1184 // ditto for method and signature: | |
1185 vmSymbols::SID name_id = vmSymbols::find_sid(name()); | |
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1186 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1187 && name_id == vmSymbols::NO_SID) |
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1188 return; |
0 | 1189 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); |
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1190 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1191 && sig_id == vmSymbols::NO_SID) return; |
0 | 1192 jshort flags = access_flags().as_short(); |
1193 | |
856
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1194 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
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1195 if (id != vmIntrinsics::_none) { |
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1196 set_intrinsic_id(id); |
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1197 return; |
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1198 } |
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1199 |
0 | 1200 // A few slightly irregular cases: |
1201 switch (klass_id) { | |
1202 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): | |
1203 // Second chance: check in regular Math. | |
1204 switch (name_id) { | |
1205 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): | |
1206 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): | |
1207 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): | |
1208 // pretend it is the corresponding method in the non-strict class: | |
1209 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); | |
856
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1210 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
0 | 1211 break; |
1212 } | |
1507
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1213 break; |
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1214 |
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1215 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. |
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1216 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): |
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1217 if (!is_native()) break; |
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1218 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); |
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1219 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) |
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1220 id = vmIntrinsics::_none; |
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1221 break; |
0 | 1222 } |
1223 | |
856
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1224 if (id != vmIntrinsics::_none) { |
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1225 // Set up its iid. It is an alias method. |
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1226 set_intrinsic_id(id); |
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1227 return; |
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1228 } |
0 | 1229 } |
1230 | |
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1231 // These two methods are static since a GC may move the Method |
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1232 bool Method::load_signature_classes(methodHandle m, TRAPS) { |
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1233 if (THREAD->is_Compiler_thread()) { |
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1234 // There is nothing useful this routine can do from within the Compile thread. |
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1235 // Hopefully, the signature contains only well-known classes. |
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1236 // We could scan for this and return true/false, but the caller won't care. |
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1237 return false; |
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1238 } |
0 | 1239 bool sig_is_loaded = true; |
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1240 Handle class_loader(THREAD, m->method_holder()->class_loader()); |
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1241 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); |
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1242 ResourceMark rm(THREAD); |
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1243 Symbol* signature = m->signature(); |
0 | 1244 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1245 if (ss.is_object()) { | |
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1246 Symbol* sym = ss.as_symbol(CHECK_(false)); |
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1247 Symbol* name = sym; |
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1248 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, |
0 | 1249 protection_domain, THREAD); |
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1250 // We are loading classes eagerly. If a ClassNotFoundException or |
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1251 // a LinkageError was generated, be sure to ignore it. |
0 | 1252 if (HAS_PENDING_EXCEPTION) { |
1142 | 1253 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || |
1254 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { | |
0 | 1255 CLEAR_PENDING_EXCEPTION; |
1256 } else { | |
1257 return false; | |
1258 } | |
1259 } | |
1260 if( klass == NULL) { sig_is_loaded = false; } | |
1261 } | |
1262 } | |
1263 return sig_is_loaded; | |
1264 } | |
1265 | |
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1266 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { |
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1267 Handle class_loader(THREAD, m->method_holder()->class_loader()); |
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1268 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); |
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1269 ResourceMark rm(THREAD); |
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1270 Symbol* signature = m->signature(); |
0 | 1271 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1272 if (ss.type() == T_OBJECT) { | |
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1273 Symbol* name = ss.as_symbol_or_null(); |
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1274 if (name == NULL) return true; |
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1275 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); |
0 | 1276 if (klass == NULL) return true; |
1277 } | |
1278 } | |
1279 return false; | |
1280 } | |
1281 | |
1282 // Exposed so field engineers can debug VM | |
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1283 void Method::print_short_name(outputStream* st) { |
0 | 1284 ResourceMark rm; |
1285 #ifdef PRODUCT | |
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1286 st->print(" %s::", method_holder()->external_name()); |
0 | 1287 #else |
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1288 st->print(" %s::", method_holder()->internal_name()); |
0 | 1289 #endif |
1290 name()->print_symbol_on(st); | |
1291 if (WizardMode) signature()->print_symbol_on(st); | |
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1292 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) |
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1293 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); |
0 | 1294 } |
1295 | |
1296 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
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1297 static void reorder_based_on_method_index(Array<Method*>* methods, |
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1298 Array<AnnotationArray*>* annotations, |
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1299 GrowableArray<AnnotationArray*>* temp_array) { |
0 | 1300 if (annotations == NULL) { |
1301 return; | |
1302 } | |
1303 | |
1304 int length = methods->length(); | |
1305 int i; | |
1306 // Copy to temp array | |
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1307 temp_array->clear(); |
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1308 for (i = 0; i < length; i++) { |
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1309 temp_array->append(annotations->at(i)); |
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1310 } |
0 | 1311 |
1312 // Copy back using old method indices | |
1313 for (i = 0; i < length; i++) { | |
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1314 Method* m = methods->at(i); |
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1315 annotations->at_put(i, temp_array->at(m->method_idnum())); |
0 | 1316 } |
1317 } | |
1318 | |
3779 | 1319 // Comparer for sorting an object array containing |
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1320 // Method*s. |
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1321 static int method_comparator(Method* a, Method* b) { |
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1322 return a->name()->fast_compare(b->name()); |
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1323 } |
0 | 1324 |
1325 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
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1326 void Method::sort_methods(Array<Method*>* methods, |
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1327 Array<AnnotationArray*>* methods_annotations, |
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1328 Array<AnnotationArray*>* methods_parameter_annotations, |
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1329 Array<AnnotationArray*>* methods_default_annotations, |
0 | 1330 bool idempotent) { |
1331 int length = methods->length(); | |
1332 if (length > 1) { | |
1333 bool do_annotations = false; | |
1334 if (methods_annotations != NULL || | |
1335 methods_parameter_annotations != NULL || | |
1336 methods_default_annotations != NULL) { | |
1337 do_annotations = true; | |
1338 } | |
1339 if (do_annotations) { | |
1340 // Remember current method ordering so we can reorder annotations | |
1341 for (int i = 0; i < length; i++) { | |
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1342 Method* m = methods->at(i); |
0 | 1343 m->set_method_idnum(i); |
1344 } | |
1345 } | |
3779 | 1346 { |
1347 No_Safepoint_Verifier nsv; | |
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1348 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); |
0 | 1349 } |
1350 | |
1351 // Sort annotations if necessary | |
1352 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), ""); | |
1353 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), ""); | |
1354 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), ""); | |
1355 if (do_annotations) { | |
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1356 ResourceMark rm; |
0 | 1357 // Allocate temporary storage |
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1358 GrowableArray<AnnotationArray*>* temp_array = new GrowableArray<AnnotationArray*>(length); |
0 | 1359 reorder_based_on_method_index(methods, methods_annotations, temp_array); |
1360 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array); | |
1361 reorder_based_on_method_index(methods, methods_default_annotations, temp_array); | |
1362 } | |
1363 | |
1364 // Reset method ordering | |
1365 for (int i = 0; i < length; i++) { | |
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1366 Method* m = methods->at(i); |
0 | 1367 m->set_method_idnum(i); |
1368 } | |
1369 } | |
1370 } | |
1371 | |
1372 | |
1373 //----------------------------------------------------------------------------------- | |
1374 // Non-product code | |
1375 | |
1376 #ifndef PRODUCT | |
1377 class SignatureTypePrinter : public SignatureTypeNames { | |
1378 private: | |
1379 outputStream* _st; | |
1380 bool _use_separator; | |
1381 | |
1382 void type_name(const char* name) { | |
1383 if (_use_separator) _st->print(", "); | |
1384 _st->print(name); | |
1385 _use_separator = true; | |
1386 } | |
1387 | |
1388 public: | |
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1389 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { |
0 | 1390 _st = st; |
1391 _use_separator = false; | |
1392 } | |
1393 | |
1394 void print_parameters() { _use_separator = false; iterate_parameters(); } | |
1395 void print_returntype() { _use_separator = false; iterate_returntype(); } | |
1396 }; | |
1397 | |
1398 | |
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1399 void Method::print_name(outputStream* st) { |
0 | 1400 Thread *thread = Thread::current(); |
1401 ResourceMark rm(thread); | |
1402 SignatureTypePrinter sig(signature(), st); | |
1403 st->print("%s ", is_static() ? "static" : "virtual"); | |
1404 sig.print_returntype(); | |
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1405 st->print(" %s.", method_holder()->internal_name()); |
0 | 1406 name()->print_symbol_on(st); |
1407 st->print("("); | |
1408 sig.print_parameters(); | |
1409 st->print(")"); | |
1410 } | |
1411 | |
1412 | |
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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() { |
1783 | 1552 if (TieredCompilation) { |
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1553 MethodData* const mdo = method_data(); |
1783 | 1554 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { |
1555 return InvocationCounter::count_limit; | |
1556 } else { | |
1557 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); | |
1558 } | |
1559 } else { | |
1560 return invocation_counter()->count(); | |
1561 } | |
1562 } | |
1563 | |
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1564 int Method::backedge_count() { |
1783 | 1565 if (TieredCompilation) { |
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1566 MethodData* const mdo = method_data(); |
1783 | 1567 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { |
1568 return InvocationCounter::count_limit; | |
1569 } else { | |
1570 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); | |
1571 } | |
1572 } else { | |
1573 return backedge_counter()->count(); | |
1574 } | |
1575 } | |
1576 | |
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1577 int Method::highest_comp_level() const { |
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1578 MethodData* mdo = method_data(); |
1783 | 1579 if (mdo != NULL) { |
1580 return mdo->highest_comp_level(); | |
1581 } else { | |
1582 return CompLevel_none; | |
1583 } | |
1584 } | |
1585 | |
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1586 int Method::highest_osr_comp_level() const { |
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1587 MethodData* mdo = method_data(); |
1783 | 1588 if (mdo != NULL) { |
1589 return mdo->highest_osr_comp_level(); | |
1590 } else { | |
1591 return CompLevel_none; | |
1592 } | |
1593 } | |
1594 | |
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1595 void Method::set_highest_comp_level(int level) { |
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1596 MethodData* mdo = method_data(); |
1783 | 1597 if (mdo != NULL) { |
1598 mdo->set_highest_comp_level(level); | |
1599 } | |
1600 } | |
1601 | |
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1602 void Method::set_highest_osr_comp_level(int level) { |
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1603 MethodData* mdo = method_data(); |
1783 | 1604 if (mdo != NULL) { |
1605 mdo->set_highest_osr_comp_level(level); | |
1606 } | |
1607 } | |
1608 | |
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1609 BreakpointInfo::BreakpointInfo(Method* m, int bci) { |
0 | 1610 _bci = bci; |
1611 _name_index = m->name_index(); | |
1612 _signature_index = m->signature_index(); | |
1613 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); | |
1614 if (_orig_bytecode == Bytecodes::_breakpoint) | |
1615 _orig_bytecode = m->orig_bytecode_at(_bci); | |
1616 _next = NULL; | |
1617 } | |
1618 | |
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1619 void BreakpointInfo::set(Method* method) { |
0 | 1620 #ifdef ASSERT |
1621 { | |
1622 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); | |
1623 if (code == Bytecodes::_breakpoint) | |
1624 code = method->orig_bytecode_at(_bci); | |
1625 assert(orig_bytecode() == code, "original bytecode must be the same"); | |
1626 } | |
1627 #endif | |
1628 *method->bcp_from(_bci) = Bytecodes::_breakpoint; | |
1629 method->incr_number_of_breakpoints(); | |
1630 SystemDictionary::notice_modification(); | |
1631 { | |
1632 // Deoptimize all dependents on this method | |
1633 Thread *thread = Thread::current(); | |
1634 HandleMark hm(thread); | |
1635 methodHandle mh(thread, method); | |
1636 Universe::flush_dependents_on_method(mh); | |
1637 } | |
1638 } | |
1639 | |
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1640 void BreakpointInfo::clear(Method* method) { |
0 | 1641 *method->bcp_from(_bci) = orig_bytecode(); |
1642 assert(method->number_of_breakpoints() > 0, "must not go negative"); | |
1643 method->decr_number_of_breakpoints(); | |
1644 } | |
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1645 |
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1646 // jmethodID handling |
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1647 |
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1648 // This is a block allocating object, sort of like JNIHandleBlock, only a |
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1649 // lot simpler. There aren't many of these, they aren't long, they are rarely |
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1650 // deleted and so we can do some suboptimal things. |
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1651 // It's allocated on the CHeap because once we allocate a jmethodID, we can |
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1652 // never get rid of it. |
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1653 // It would be nice to be able to parameterize the number of methods for |
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1654 // the null_class_loader but then we'd have to turn this and ClassLoaderData |
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1655 // into templates. |
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1656 |
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1657 // I feel like this brain dead class should exist somewhere in the STL |
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1658 |
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1659 class JNIMethodBlock : public CHeapObj<mtClass> { |
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1660 enum { number_of_methods = 8 }; |
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1661 |
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1662 Method* _methods[number_of_methods]; |
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1663 int _top; |
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1664 JNIMethodBlock* _next; |
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1665 public: |
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1666 static Method* const _free_method; |
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1667 |
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1668 JNIMethodBlock() : _next(NULL), _top(0) { |
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1669 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; |
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1670 } |
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1671 |
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1672 Method** add_method(Method* m) { |
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1673 if (_top < number_of_methods) { |
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1674 // top points to the next free entry. |
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1675 int i = _top; |
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1676 _methods[i] = m; |
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1677 _top++; |
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1678 return &_methods[i]; |
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1679 } else if (_top == number_of_methods) { |
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1680 // if the next free entry ran off the block see if there's a free entry |
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1681 for (int i = 0; i< number_of_methods; i++) { |
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1682 if (_methods[i] == _free_method) { |
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1683 _methods[i] = m; |
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1684 return &_methods[i]; |
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1685 } |
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1686 } |
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1687 // Only check each block once for frees. They're very unlikely. |
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1688 // Increment top past the end of the block. |
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1689 _top++; |
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1690 } |
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1691 // need to allocate a next block. |
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1692 if (_next == NULL) { |
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1693 _next = new JNIMethodBlock(); |
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1694 } |
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1695 return _next->add_method(m); |
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1696 } |
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1697 |
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1698 bool contains(Method** m) { |
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1699 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1700 for (int i = 0; i< number_of_methods; i++) { |
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1701 if (&(b->_methods[i]) == m) { |
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1702 return true; |
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1703 } |
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1704 } |
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1705 } |
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1706 return false; // not found |
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1707 } |
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1708 |
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1709 // Doesn't really destroy it, just marks it as free so it can be reused. |
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1710 void destroy_method(Method** m) { |
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1711 #ifdef ASSERT |
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1712 assert(contains(m), "should be a methodID"); |
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1713 #endif // ASSERT |
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1714 *m = _free_method; |
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1715 } |
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1716 |
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1717 // During class unloading the methods are cleared, which is different |
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1718 // than freed. |
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1719 void clear_all_methods() { |
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1720 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1721 for (int i = 0; i< number_of_methods; i++) { |
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1722 _methods[i] = NULL; |
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1723 } |
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1724 } |
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1725 } |
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1726 #ifndef PRODUCT |
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1727 int count_methods() { |
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1728 // count all allocated methods |
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1729 int count = 0; |
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1730 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1731 for (int i = 0; i< number_of_methods; i++) { |
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1732 if (_methods[i] != _free_method) count++; |
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1733 } |
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1734 } |
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1735 return count; |
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1736 } |
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1737 #endif // PRODUCT |
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1738 }; |
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1739 |
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1740 // Something that can't be mistaken for an address or a markOop |
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1741 Method* const JNIMethodBlock::_free_method = (Method*)55; |
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1742 |
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1743 // Add a method id to the jmethod_ids |
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1744 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { |
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1745 ClassLoaderData* cld = loader_data; |
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1746 |
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1747 if (!SafepointSynchronize::is_at_safepoint()) { |
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1748 // Have to add jmethod_ids() to class loader data thread-safely. |
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1749 // Also have to add the method to the list safely, which the cld lock |
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1750 // protects as well. |
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1751 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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1752 if (cld->jmethod_ids() == NULL) { |
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1753 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1754 } |
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1755 // jmethodID is a pointer to Method* |
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1756 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1757 } else { |
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1758 // At safepoint, we are single threaded and can set this. |
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1759 if (cld->jmethod_ids() == NULL) { |
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1760 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1761 } |
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1762 // jmethodID is a pointer to Method* |
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1763 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1764 } |
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1765 } |
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1766 |
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1767 // Mark a jmethodID as free. This is called when there is a data race in |
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1768 // InstanceKlass while creating the jmethodID cache. |
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1769 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { |
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1770 ClassLoaderData* cld = loader_data; |
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1771 Method** ptr = (Method**)m; |
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1772 assert(cld->jmethod_ids() != NULL, "should have method handles"); |
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1773 cld->jmethod_ids()->destroy_method(ptr); |
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1774 } |
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1775 |
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1776 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { |
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1777 // Can't assert the method_holder is the same because the new method has the |
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1778 // scratch method holder. |
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1779 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() |
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1780 == new_method->method_holder()->class_loader(), |
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1781 "changing to a different class loader"); |
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1782 // Just change the method in place, jmethodID pointer doesn't change. |
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1783 *((Method**)jmid) = new_method; |
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1784 } |
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1785 |
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1786 bool Method::is_method_id(jmethodID mid) { |
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1787 Method* m = resolve_jmethod_id(mid); |
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1788 assert(m != NULL, "should be called with non-null method"); |
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1789 InstanceKlass* ik = m->method_holder(); |
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1790 ClassLoaderData* cld = ik->class_loader_data(); |
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1791 if (cld->jmethod_ids() == NULL) return false; |
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1792 return (cld->jmethod_ids()->contains((Method**)mid)); |
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1793 } |
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1794 |
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1795 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { |
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1796 if (mid == NULL) return NULL; |
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1797 Method* o = resolve_jmethod_id(mid); |
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1798 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { |
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1799 return NULL; |
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1800 } |
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1801 return o; |
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1802 }; |
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1803 |
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1804 void Method::set_on_stack(const bool value) { |
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1805 // Set both the method itself and its constant pool. The constant pool |
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1806 // on stack means some method referring to it is also on the stack. |
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1807 _access_flags.set_on_stack(value); |
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1808 constants()->set_on_stack(value); |
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1809 if (value) MetadataOnStackMark::record(this); |
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1810 } |
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1811 |
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1812 // Called when the class loader is unloaded to make all methods weak. |
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1813 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { |
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1814 loader_data->jmethod_ids()->clear_all_methods(); |
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1815 } |
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1816 |
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1817 #ifndef PRODUCT |
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1818 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { |
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1819 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); |
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1820 } |
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1821 #endif // PRODUCT |
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1822 |
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1823 |
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1824 // Printing |
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1825 |
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1826 #ifndef PRODUCT |
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1827 |
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1828 void Method::print_on(outputStream* st) const { |
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1829 ResourceMark rm; |
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1830 assert(is_method(), "must be method"); |
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1831 st->print_cr(internal_name()); |
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1832 // get the effect of PrintOopAddress, always, for methods: |
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1833 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); |
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1834 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); |
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1835 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); |
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1836 constants()->print_value_on(st); st->cr(); |
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1837 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); |
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1838 st->print (" - name: "); name()->print_value_on(st); st->cr(); |
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1839 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); |
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1840 st->print_cr(" - max stack: %d", max_stack()); |
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1841 st->print_cr(" - max locals: %d", max_locals()); |
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1842 st->print_cr(" - size of params: %d", size_of_parameters()); |
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1843 st->print_cr(" - method size: %d", method_size()); |
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1844 if (intrinsic_id() != vmIntrinsics::_none) |
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1845 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); |
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1846 if (highest_comp_level() != CompLevel_none) |
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1847 st->print_cr(" - highest level: %d", highest_comp_level()); |
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1848 st->print_cr(" - vtable index: %d", _vtable_index); |
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1849 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); |
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1850 st->print( " - adapters: "); |
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1851 AdapterHandlerEntry* a = ((Method*)this)->adapter(); |
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1852 if (a == NULL) |
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1853 st->print_cr(INTPTR_FORMAT, a); |
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1854 else |
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1855 a->print_adapter_on(st); |
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1856 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); |
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1857 st->print_cr(" - code size: %d", code_size()); |
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1858 if (code_size() != 0) { |
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1859 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); |
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1860 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); |
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1861 } |
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1862 if (method_data() != NULL) { |
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1863 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); |
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1864 } |
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1865 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); |
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1866 if (checked_exceptions_length() > 0) { |
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1867 CheckedExceptionElement* table = checked_exceptions_start(); |
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1868 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); |
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1869 if (Verbose) { |
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1870 for (int i = 0; i < checked_exceptions_length(); i++) { |
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1871 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); |
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1872 } |
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1873 } |
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1874 } |
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1875 if (has_linenumber_table()) { |
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1876 u_char* table = compressed_linenumber_table(); |
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1877 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); |
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1878 if (Verbose) { |
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1879 CompressedLineNumberReadStream stream(table); |
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1880 while (stream.read_pair()) { |
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1881 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); |
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1882 } |
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1883 } |
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1884 } |
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1885 st->print_cr(" - localvar length: %d", localvariable_table_length()); |
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1886 if (localvariable_table_length() > 0) { |
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1887 LocalVariableTableElement* table = localvariable_table_start(); |
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1888 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); |
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1889 if (Verbose) { |
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1890 for (int i = 0; i < localvariable_table_length(); i++) { |
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1891 int bci = table[i].start_bci; |
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1892 int len = table[i].length; |
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1893 const char* name = constants()->printable_name_at(table[i].name_cp_index); |
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1894 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); |
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1895 int slot = table[i].slot; |
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1896 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); |
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1897 } |
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1898 } |
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1899 } |
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1900 if (code() != NULL) { |
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1901 st->print (" - compiled code: "); |
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1902 code()->print_value_on(st); |
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1903 } |
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1904 if (is_native()) { |
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1905 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); |
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1906 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); |
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1907 } |
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1908 } |
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1909 |
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1910 #endif //PRODUCT |
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1911 |
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1912 void Method::print_value_on(outputStream* st) const { |
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1913 assert(is_method(), "must be method"); |
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1914 st->print_cr(internal_name()); |
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1915 print_address_on(st); |
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1916 st->print(" "); |
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1917 name()->print_value_on(st); |
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1918 st->print(" "); |
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1919 signature()->print_value_on(st); |
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1920 st->print(" in "); |
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1921 method_holder()->print_value_on(st); |
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1922 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); |
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1923 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); |
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1924 } |
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1925 |
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1926 |
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1927 // Verification |
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1928 |
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1929 void Method::verify_on(outputStream* st) { |
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1930 guarantee(is_method(), "object must be method"); |
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1931 guarantee(is_metadata(), "should be metadata"); |
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1932 guarantee(constants()->is_constantPool(), "should be constant pool"); |
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1933 guarantee(constants()->is_metadata(), "should be metadata"); |
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1934 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); |
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1935 guarantee(constMethod()->is_metadata(), "should be metadata"); |
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1936 MethodData* md = method_data(); |
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1937 guarantee(md == NULL || |
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1938 md->is_metadata(), "should be in permspace"); |
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1939 guarantee(md == NULL || |
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1940 md->is_methodData(), "should be method data"); |
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1941 } |