Mercurial > hg > graal-compiler
annotate src/share/vm/oops/method.cpp @ 8002:8391fdd36e1f
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author | dlong |
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date | Sun, 27 Jan 2013 01:07:09 -0800 |
parents | 18c3c3fa291b |
children | 989155e2d07a 5daaddd917a1 6a51fc70a15e |
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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, | |
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67 int method_parameters_length, |
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68 u2 generic_signature_index, |
6934 | 69 ConstMethod::MethodType method_type, |
70 TRAPS) { | |
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71 assert(!access_flags.is_native() || byte_code_size == 0, |
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72 "native methods should not contain byte codes"); |
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73 ConstMethod* cm = ConstMethod::allocate(loader_data, |
6934 | 74 byte_code_size, |
75 compressed_line_number_size, | |
76 localvariable_table_length, | |
77 exception_table_length, | |
78 checked_exceptions_length, | |
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79 method_parameters_length, |
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80 generic_signature_index, |
6934 | 81 method_type, |
82 CHECK_NULL); | |
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83 |
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84 int size = Method::size(access_flags.is_native()); |
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85 |
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86 return new (loader_data, size, false, THREAD) Method(cm, access_flags, size); |
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87 } |
0 | 88 |
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89 Method::Method(ConstMethod* xconst, |
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90 AccessFlags access_flags, int size) { |
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91 No_Safepoint_Verifier no_safepoint; |
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92 set_constMethod(xconst); |
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93 set_access_flags(access_flags); |
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94 set_method_size(size); |
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95 set_name_index(0); |
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96 set_signature_index(0); |
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97 #ifdef CC_INTERP |
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98 set_result_index(T_VOID); |
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99 #endif |
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100 set_constants(NULL); |
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101 set_max_stack(0); |
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102 set_max_locals(0); |
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103 set_intrinsic_id(vmIntrinsics::_none); |
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104 set_jfr_towrite(false); |
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105 set_method_data(NULL); |
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106 set_interpreter_throwout_count(0); |
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107 set_vtable_index(Method::garbage_vtable_index); |
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108 |
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109 // Fix and bury in Method* |
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110 set_interpreter_entry(NULL); // sets i2i entry and from_int |
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111 set_adapter_entry(NULL); |
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112 clear_code(); // from_c/from_i get set to c2i/i2i |
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113 |
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114 if (access_flags.is_native()) { |
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115 clear_native_function(); |
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116 set_signature_handler(NULL); |
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117 } |
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118 |
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119 NOT_PRODUCT(set_compiled_invocation_count(0);) |
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120 set_interpreter_invocation_count(0); |
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121 invocation_counter()->init(); |
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122 backedge_counter()->init(); |
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123 clear_number_of_breakpoints(); |
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124 |
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125 #ifdef TIERED |
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126 set_rate(0); |
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127 set_prev_event_count(0); |
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128 set_prev_time(0); |
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129 #endif |
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130 } |
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131 |
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132 // Release Method*. The nmethod will be gone when we get here because |
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133 // we've walked the code cache. |
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134 void Method::deallocate_contents(ClassLoaderData* loader_data) { |
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135 MetadataFactory::free_metadata(loader_data, constMethod()); |
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136 set_constMethod(NULL); |
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137 MetadataFactory::free_metadata(loader_data, method_data()); |
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138 set_method_data(NULL); |
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139 // The nmethod will be gone when we get here. |
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140 if (code() != NULL) _code = NULL; |
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141 } |
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142 |
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143 address Method::get_i2c_entry() { |
0 | 144 assert(_adapter != NULL, "must have"); |
145 return _adapter->get_i2c_entry(); | |
146 } | |
147 | |
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148 address Method::get_c2i_entry() { |
0 | 149 assert(_adapter != NULL, "must have"); |
150 return _adapter->get_c2i_entry(); | |
151 } | |
152 | |
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153 address Method::get_c2i_unverified_entry() { |
0 | 154 assert(_adapter != NULL, "must have"); |
155 return _adapter->get_c2i_unverified_entry(); | |
156 } | |
157 | |
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158 char* Method::name_and_sig_as_C_string() const { |
6983 | 159 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature()); |
0 | 160 } |
161 | |
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162 char* Method::name_and_sig_as_C_string(char* buf, int size) const { |
6983 | 163 return name_and_sig_as_C_string(constants()->pool_holder(), name(), signature(), buf, size); |
0 | 164 } |
165 | |
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166 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature) { |
0 | 167 const char* klass_name = klass->external_name(); |
168 int klass_name_len = (int)strlen(klass_name); | |
169 int method_name_len = method_name->utf8_length(); | |
170 int len = klass_name_len + 1 + method_name_len + signature->utf8_length(); | |
171 char* dest = NEW_RESOURCE_ARRAY(char, len + 1); | |
172 strcpy(dest, klass_name); | |
173 dest[klass_name_len] = '.'; | |
174 strcpy(&dest[klass_name_len + 1], method_name->as_C_string()); | |
175 strcpy(&dest[klass_name_len + 1 + method_name_len], signature->as_C_string()); | |
176 dest[len] = 0; | |
177 return dest; | |
178 } | |
179 | |
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180 char* Method::name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size) { |
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181 Symbol* klass_name = klass->name(); |
0 | 182 klass_name->as_klass_external_name(buf, size); |
183 int len = (int)strlen(buf); | |
184 | |
185 if (len < size - 1) { | |
186 buf[len++] = '.'; | |
187 | |
188 method_name->as_C_string(&(buf[len]), size - len); | |
189 len = (int)strlen(buf); | |
190 | |
191 signature->as_C_string(&(buf[len]), size - len); | |
192 } | |
193 | |
194 return buf; | |
195 } | |
196 | |
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197 int Method::fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS) { |
0 | 198 // exception table holds quadruple entries of the form (beg_bci, end_bci, handler_bci, klass_index) |
199 // access exception table | |
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200 ExceptionTable table(mh()); |
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201 int length = table.length(); |
0 | 202 // iterate through all entries sequentially |
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203 constantPoolHandle pool(THREAD, mh->constants()); |
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204 for (int i = 0; i < length; i ++) { |
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205 //reacquire the table in case a GC happened |
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206 ExceptionTable table(mh()); |
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207 int beg_bci = table.start_pc(i); |
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208 int end_bci = table.end_pc(i); |
0 | 209 assert(beg_bci <= end_bci, "inconsistent exception table"); |
210 if (beg_bci <= throw_bci && throw_bci < end_bci) { | |
211 // exception handler bci range covers throw_bci => investigate further | |
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212 int handler_bci = table.handler_pc(i); |
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213 int klass_index = table.catch_type_index(i); |
0 | 214 if (klass_index == 0) { |
215 return handler_bci; | |
216 } else if (ex_klass.is_null()) { | |
217 return handler_bci; | |
218 } else { | |
219 // we know the exception class => get the constraint class | |
220 // this may require loading of the constraint class; if verification | |
221 // fails or some other exception occurs, return handler_bci | |
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222 Klass* k = pool->klass_at(klass_index, CHECK_(handler_bci)); |
0 | 223 KlassHandle klass = KlassHandle(THREAD, k); |
224 assert(klass.not_null(), "klass not loaded"); | |
225 if (ex_klass->is_subtype_of(klass())) { | |
226 return handler_bci; | |
227 } | |
228 } | |
229 } | |
230 } | |
231 | |
232 return -1; | |
233 } | |
234 | |
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235 void Method::mask_for(int bci, InterpreterOopMap* mask) { |
0 | 236 |
237 Thread* myThread = Thread::current(); | |
238 methodHandle h_this(myThread, this); | |
239 #ifdef ASSERT | |
240 bool has_capability = myThread->is_VM_thread() || | |
241 myThread->is_ConcurrentGC_thread() || | |
242 myThread->is_GC_task_thread(); | |
243 | |
244 if (!has_capability) { | |
245 if (!VerifyStack && !VerifyLastFrame) { | |
246 // verify stack calls this outside VM thread | |
247 warning("oopmap should only be accessed by the " | |
248 "VM, GC task or CMS threads (or during debugging)"); | |
249 InterpreterOopMap local_mask; | |
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250 method_holder()->mask_for(h_this, bci, &local_mask); |
0 | 251 local_mask.print(); |
252 } | |
253 } | |
254 #endif | |
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255 method_holder()->mask_for(h_this, bci, mask); |
0 | 256 return; |
257 } | |
258 | |
259 | |
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260 int Method::bci_from(address bcp) const { |
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261 #ifdef ASSERT |
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262 { ResourceMark rm; |
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263 assert(is_native() && bcp == code_base() || contains(bcp) || is_error_reported(), |
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264 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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265 } |
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266 #endif |
0 | 267 return bcp - code_base(); |
268 } | |
269 | |
270 | |
271 // Return (int)bcx if it appears to be a valid BCI. | |
272 // Return bci_from((address)bcx) if it appears to be a valid BCP. | |
273 // Return -1 otherwise. | |
274 // Used by profiling code, when invalid data is a possibility. | |
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275 // The caller is responsible for validating the Method* itself. |
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276 int Method::validate_bci_from_bcx(intptr_t bcx) const { |
0 | 277 // keep bci as -1 if not a valid bci |
278 int bci = -1; | |
279 if (bcx == 0 || (address)bcx == code_base()) { | |
280 // code_size() may return 0 and we allow 0 here | |
281 // the method may be native | |
282 bci = 0; | |
283 } else if (frame::is_bci(bcx)) { | |
284 if (bcx < code_size()) { | |
285 bci = (int)bcx; | |
286 } | |
287 } else if (contains((address)bcx)) { | |
288 bci = (address)bcx - code_base(); | |
289 } | |
290 // Assert that if we have dodged any asserts, bci is negative. | |
291 assert(bci == -1 || bci == bci_from(bcp_from(bci)), "sane bci if >=0"); | |
292 return bci; | |
293 } | |
294 | |
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295 address Method::bcp_from(int bci) const { |
0 | 296 assert((is_native() && bci == 0) || (!is_native() && 0 <= bci && bci < code_size()), "illegal bci"); |
297 address bcp = code_base() + bci; | |
298 assert(is_native() && bcp == code_base() || contains(bcp), "bcp doesn't belong to this method"); | |
299 return bcp; | |
300 } | |
301 | |
302 | |
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303 int Method::size(bool is_native) { |
0 | 304 // If native, then include pointers for native_function and signature_handler |
305 int extra_bytes = (is_native) ? 2*sizeof(address*) : 0; | |
306 int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; | |
307 return align_object_size(header_size() + extra_words); | |
308 } | |
309 | |
310 | |
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311 Symbol* Method::klass_name() const { |
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312 Klass* k = method_holder(); |
0 | 313 assert(k->is_klass(), "must be klass"); |
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314 InstanceKlass* ik = (InstanceKlass*) k; |
0 | 315 return ik->name(); |
316 } | |
317 | |
318 | |
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319 void Method::set_interpreter_kind() { |
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320 int kind = Interpreter::method_kind(this); |
0 | 321 assert(kind != Interpreter::invalid, |
322 "interpreter entry must be valid"); | |
323 set_interpreter_kind(kind); | |
324 } | |
325 | |
326 | |
327 // Attempt to return method oop to original state. Clear any pointers | |
328 // (to objects outside the shared spaces). We won't be able to predict | |
329 // where they should point in a new JVM. Further initialize some | |
330 // entries now in order allow them to be write protected later. | |
331 | |
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332 void Method::remove_unshareable_info() { |
0 | 333 unlink_method(); |
334 set_interpreter_kind(); | |
335 } | |
336 | |
337 | |
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338 bool Method::was_executed_more_than(int n) { |
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339 // Invocation counter is reset when the Method* is compiled. |
0 | 340 // If the method has compiled code we therefore assume it has |
341 // be excuted more than n times. | |
342 if (is_accessor() || is_empty_method() || (code() != NULL)) { | |
343 // interpreter doesn't bump invocation counter of trivial methods | |
344 // compiler does not bump invocation counter of compiled methods | |
345 return true; | |
1783 | 346 } |
347 else if (_invocation_counter.carry() || (method_data() != NULL && method_data()->invocation_counter()->carry())) { | |
0 | 348 // The carry bit is set when the counter overflows and causes |
349 // a compilation to occur. We don't know how many times | |
350 // the counter has been reset, so we simply assume it has | |
351 // been executed more than n times. | |
352 return true; | |
353 } else { | |
354 return invocation_count() > n; | |
355 } | |
356 } | |
357 | |
358 #ifndef PRODUCT | |
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359 void Method::print_invocation_count() { |
0 | 360 if (is_static()) tty->print("static "); |
361 if (is_final()) tty->print("final "); | |
362 if (is_synchronized()) tty->print("synchronized "); | |
363 if (is_native()) tty->print("native "); | |
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364 method_holder()->name()->print_symbol_on(tty); |
0 | 365 tty->print("."); |
366 name()->print_symbol_on(tty); | |
367 signature()->print_symbol_on(tty); | |
368 | |
369 if (WizardMode) { | |
370 // dump the size of the byte codes | |
371 tty->print(" {%d}", code_size()); | |
372 } | |
373 tty->cr(); | |
374 | |
375 tty->print_cr (" interpreter_invocation_count: %8d ", interpreter_invocation_count()); | |
376 tty->print_cr (" invocation_counter: %8d ", invocation_count()); | |
377 tty->print_cr (" backedge_counter: %8d ", backedge_count()); | |
378 if (CountCompiledCalls) { | |
379 tty->print_cr (" compiled_invocation_count: %8d ", compiled_invocation_count()); | |
380 } | |
381 | |
382 } | |
383 #endif | |
384 | |
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385 // Build a MethodData* object to hold information about this method |
0 | 386 // collected in the interpreter. |
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387 void Method::build_interpreter_method_data(methodHandle method, TRAPS) { |
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388 // Do not profile method if current thread holds the pending list lock, |
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389 // which avoids deadlock for acquiring the MethodData_lock. |
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390 if (InstanceRefKlass::owns_pending_list_lock((JavaThread*)THREAD)) { |
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391 return; |
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392 } |
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393 |
0 | 394 // Grab a lock here to prevent multiple |
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395 // MethodData*s from being created. |
0 | 396 MutexLocker ml(MethodData_lock, THREAD); |
397 if (method->method_data() == NULL) { | |
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398 ClassLoaderData* loader_data = method->method_holder()->class_loader_data(); |
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399 MethodData* method_data = MethodData::allocate(loader_data, method, CHECK); |
0 | 400 method->set_method_data(method_data); |
401 if (PrintMethodData && (Verbose || WizardMode)) { | |
402 ResourceMark rm(THREAD); | |
403 tty->print("build_interpreter_method_data for "); | |
404 method->print_name(tty); | |
405 tty->cr(); | |
406 // At the end of the run, the MDO, full of data, will be dumped. | |
407 } | |
408 } | |
409 } | |
410 | |
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411 void Method::cleanup_inline_caches() { |
0 | 412 // The current system doesn't use inline caches in the interpreter |
413 // => nothing to do (keep this method around for future use) | |
414 } | |
415 | |
416 | |
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417 int Method::extra_stack_words() { |
710 | 418 // not an inline function, to avoid a header dependency on Interpreter |
1506 | 419 return extra_stack_entries() * Interpreter::stackElementSize; |
710 | 420 } |
421 | |
422 | |
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423 void Method::compute_size_of_parameters(Thread *thread) { |
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424 ArgumentSizeComputer asc(signature()); |
0 | 425 set_size_of_parameters(asc.size() + (is_static() ? 0 : 1)); |
426 } | |
427 | |
428 #ifdef CC_INTERP | |
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429 void Method::set_result_index(BasicType type) { |
0 | 430 _result_index = Interpreter::BasicType_as_index(type); |
431 } | |
432 #endif | |
433 | |
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434 BasicType Method::result_type() const { |
0 | 435 ResultTypeFinder rtf(signature()); |
436 return rtf.type(); | |
437 } | |
438 | |
439 | |
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440 bool Method::is_empty_method() const { |
0 | 441 return code_size() == 1 |
442 && *code_base() == Bytecodes::_return; | |
443 } | |
444 | |
445 | |
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446 bool Method::is_vanilla_constructor() const { |
0 | 447 // Returns true if this method is a vanilla constructor, i.e. an "<init>" "()V" method |
448 // which only calls the superclass vanilla constructor and possibly does stores of | |
449 // zero constants to local fields: | |
450 // | |
451 // aload_0 | |
452 // invokespecial | |
453 // indexbyte1 | |
454 // indexbyte2 | |
455 // | |
456 // followed by an (optional) sequence of: | |
457 // | |
458 // aload_0 | |
459 // aconst_null / iconst_0 / fconst_0 / dconst_0 | |
460 // putfield | |
461 // indexbyte1 | |
462 // indexbyte2 | |
463 // | |
464 // followed by: | |
465 // | |
466 // return | |
467 | |
468 assert(name() == vmSymbols::object_initializer_name(), "Should only be called for default constructors"); | |
469 assert(signature() == vmSymbols::void_method_signature(), "Should only be called for default constructors"); | |
470 int size = code_size(); | |
471 // Check if size match | |
472 if (size == 0 || size % 5 != 0) return false; | |
473 address cb = code_base(); | |
474 int last = size - 1; | |
475 if (cb[0] != Bytecodes::_aload_0 || cb[1] != Bytecodes::_invokespecial || cb[last] != Bytecodes::_return) { | |
476 // Does not call superclass default constructor | |
477 return false; | |
478 } | |
479 // Check optional sequence | |
480 for (int i = 4; i < last; i += 5) { | |
481 if (cb[i] != Bytecodes::_aload_0) return false; | |
482 if (!Bytecodes::is_zero_const(Bytecodes::cast(cb[i+1]))) return false; | |
483 if (cb[i+2] != Bytecodes::_putfield) return false; | |
484 } | |
485 return true; | |
486 } | |
487 | |
488 | |
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489 bool Method::compute_has_loops_flag() { |
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490 BytecodeStream bcs(this); |
0 | 491 Bytecodes::Code bc; |
492 | |
493 while ((bc = bcs.next()) >= 0) { | |
494 switch( bc ) { | |
495 case Bytecodes::_ifeq: | |
496 case Bytecodes::_ifnull: | |
497 case Bytecodes::_iflt: | |
498 case Bytecodes::_ifle: | |
499 case Bytecodes::_ifne: | |
500 case Bytecodes::_ifnonnull: | |
501 case Bytecodes::_ifgt: | |
502 case Bytecodes::_ifge: | |
503 case Bytecodes::_if_icmpeq: | |
504 case Bytecodes::_if_icmpne: | |
505 case Bytecodes::_if_icmplt: | |
506 case Bytecodes::_if_icmpgt: | |
507 case Bytecodes::_if_icmple: | |
508 case Bytecodes::_if_icmpge: | |
509 case Bytecodes::_if_acmpeq: | |
510 case Bytecodes::_if_acmpne: | |
511 case Bytecodes::_goto: | |
512 case Bytecodes::_jsr: | |
513 if( bcs.dest() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
514 break; | |
515 | |
516 case Bytecodes::_goto_w: | |
517 case Bytecodes::_jsr_w: | |
518 if( bcs.dest_w() < bcs.next_bci() ) _access_flags.set_has_loops(); | |
519 break; | |
520 } | |
521 } | |
522 _access_flags.set_loops_flag_init(); | |
523 return _access_flags.has_loops(); | |
524 } | |
525 | |
526 | |
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527 bool Method::is_final_method() const { |
0 | 528 // %%% Should return true for private methods also, |
529 // since there is no way to override them. | |
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530 return is_final() || method_holder()->is_final(); |
0 | 531 } |
532 | |
533 | |
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534 bool Method::is_strict_method() const { |
0 | 535 return is_strict(); |
536 } | |
537 | |
538 | |
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539 bool Method::can_be_statically_bound() const { |
0 | 540 if (is_final_method()) return true; |
541 return vtable_index() == nonvirtual_vtable_index; | |
542 } | |
543 | |
544 | |
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545 bool Method::is_accessor() const { |
0 | 546 if (code_size() != 5) return false; |
547 if (size_of_parameters() != 1) return false; | |
2142 | 548 if (java_code_at(0) != Bytecodes::_aload_0 ) return false; |
549 if (java_code_at(1) != Bytecodes::_getfield) return false; | |
550 if (java_code_at(4) != Bytecodes::_areturn && | |
551 java_code_at(4) != Bytecodes::_ireturn ) return false; | |
0 | 552 return true; |
553 } | |
554 | |
555 | |
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556 bool Method::is_initializer() const { |
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557 return name() == vmSymbols::object_initializer_name() || is_static_initializer(); |
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558 } |
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559 |
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560 bool Method::has_valid_initializer_flags() const { |
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561 return (is_static() || |
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562 method_holder()->major_version() < 51); |
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563 } |
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564 |
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565 bool Method::is_static_initializer() const { |
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566 // For classfiles version 51 or greater, ensure that the clinit method is |
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567 // static. Non-static methods with the name "<clinit>" are not static |
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568 // initializers. (older classfiles exempted for backward compatibility) |
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569 return name() == vmSymbols::class_initializer_name() && |
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570 has_valid_initializer_flags(); |
0 | 571 } |
572 | |
573 | |
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574 objArrayHandle Method::resolved_checked_exceptions_impl(Method* this_oop, TRAPS) { |
0 | 575 int length = this_oop->checked_exceptions_length(); |
576 if (length == 0) { // common case | |
577 return objArrayHandle(THREAD, Universe::the_empty_class_klass_array()); | |
578 } else { | |
579 methodHandle h_this(THREAD, this_oop); | |
1142 | 580 objArrayOop m_oop = oopFactory::new_objArray(SystemDictionary::Class_klass(), length, CHECK_(objArrayHandle())); |
0 | 581 objArrayHandle mirrors (THREAD, m_oop); |
582 for (int i = 0; i < length; i++) { | |
583 CheckedExceptionElement* table = h_this->checked_exceptions_start(); // recompute on each iteration, not gc safe | |
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584 Klass* k = h_this->constants()->klass_at(table[i].class_cp_index, CHECK_(objArrayHandle())); |
6983 | 585 assert(k->is_subclass_of(SystemDictionary::Throwable_klass()), "invalid exception class"); |
586 mirrors->obj_at_put(i, k->java_mirror()); | |
0 | 587 } |
588 return mirrors; | |
589 } | |
590 }; | |
591 | |
592 | |
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593 int Method::line_number_from_bci(int bci) const { |
0 | 594 if (bci == SynchronizationEntryBCI) bci = 0; |
595 assert(bci == 0 || 0 <= bci && bci < code_size(), "illegal bci"); | |
596 int best_bci = 0; | |
597 int best_line = -1; | |
598 | |
599 if (has_linenumber_table()) { | |
600 // The line numbers are a short array of 2-tuples [start_pc, line_number]. | |
601 // Not necessarily sorted and not necessarily one-to-one. | |
602 CompressedLineNumberReadStream stream(compressed_linenumber_table()); | |
603 while (stream.read_pair()) { | |
604 if (stream.bci() == bci) { | |
605 // perfect match | |
606 return stream.line(); | |
607 } else { | |
608 // update best_bci/line | |
609 if (stream.bci() < bci && stream.bci() >= best_bci) { | |
610 best_bci = stream.bci(); | |
611 best_line = stream.line(); | |
612 } | |
613 } | |
614 } | |
615 } | |
616 return best_line; | |
617 } | |
618 | |
619 | |
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620 bool Method::is_klass_loaded_by_klass_index(int klass_index) const { |
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621 if( constants()->tag_at(klass_index).is_unresolved_klass() ) { |
0 | 622 Thread *thread = Thread::current(); |
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623 Symbol* klass_name = constants()->klass_name_at(klass_index); |
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624 Handle loader(thread, method_holder()->class_loader()); |
6983 | 625 Handle prot (thread, method_holder()->protection_domain()); |
0 | 626 return SystemDictionary::find(klass_name, loader, prot, thread) != NULL; |
627 } else { | |
628 return true; | |
629 } | |
630 } | |
631 | |
632 | |
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633 bool Method::is_klass_loaded(int refinfo_index, bool must_be_resolved) const { |
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634 int klass_index = constants()->klass_ref_index_at(refinfo_index); |
0 | 635 if (must_be_resolved) { |
636 // Make sure klass is resolved in constantpool. | |
637 if (constants()->tag_at(klass_index).is_unresolved_klass()) return false; | |
638 } | |
639 return is_klass_loaded_by_klass_index(klass_index); | |
640 } | |
641 | |
642 | |
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643 void Method::set_native_function(address function, bool post_event_flag) { |
0 | 644 assert(function != NULL, "use clear_native_function to unregister natives"); |
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645 assert(!is_method_handle_intrinsic() || function == SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), ""); |
0 | 646 address* native_function = native_function_addr(); |
647 | |
648 // We can see racers trying to place the same native function into place. Once | |
649 // is plenty. | |
650 address current = *native_function; | |
651 if (current == function) return; | |
652 if (post_event_flag && JvmtiExport::should_post_native_method_bind() && | |
653 function != NULL) { | |
654 // native_method_throw_unsatisfied_link_error_entry() should only | |
655 // be passed when post_event_flag is false. | |
656 assert(function != | |
657 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
658 "post_event_flag mis-match"); | |
659 | |
660 // post the bind event, and possible change the bind function | |
661 JvmtiExport::post_native_method_bind(this, &function); | |
662 } | |
663 *native_function = function; | |
664 // This function can be called more than once. We must make sure that we always | |
665 // use the latest registered method -> check if a stub already has been generated. | |
666 // If so, we have to make it not_entrant. | |
667 nmethod* nm = code(); // Put it into local variable to guard against concurrent updates | |
668 if (nm != NULL) { | |
669 nm->make_not_entrant(); | |
670 } | |
671 } | |
672 | |
673 | |
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674 bool Method::has_native_function() const { |
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675 if (is_method_handle_intrinsic()) |
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676 return false; // special-cased in SharedRuntime::generate_native_wrapper |
0 | 677 address func = native_function(); |
678 return (func != NULL && func != SharedRuntime::native_method_throw_unsatisfied_link_error_entry()); | |
679 } | |
680 | |
681 | |
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682 void Method::clear_native_function() { |
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683 // Note: is_method_handle_intrinsic() is allowed here. |
0 | 684 set_native_function( |
685 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
686 !native_bind_event_is_interesting); | |
687 clear_code(); | |
688 } | |
689 | |
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690 address Method::critical_native_function() { |
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691 methodHandle mh(this); |
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692 return NativeLookup::lookup_critical_entry(mh); |
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693 } |
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694 |
0 | 695 |
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696 void Method::set_signature_handler(address handler) { |
0 | 697 address* signature_handler = signature_handler_addr(); |
698 *signature_handler = handler; | |
699 } | |
700 | |
701 | |
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702 void Method::print_made_not_compilable(int comp_level, bool is_osr, bool report) { |
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703 if (PrintCompilation && report) { |
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704 ttyLocker ttyl; |
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705 tty->print("made not %scompilable on ", is_osr ? "OSR " : ""); |
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706 if (comp_level == CompLevel_all) { |
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707 tty->print("all levels "); |
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708 } else { |
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709 tty->print("levels "); |
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710 for (int i = (int)CompLevel_none; i <= comp_level; i++) { |
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711 tty->print("%d ", i); |
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712 } |
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713 } |
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714 this->print_short_name(tty); |
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715 int size = this->code_size(); |
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716 if (size > 0) |
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717 tty->print(" (%d bytes)", size); |
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718 tty->cr(); |
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719 } |
0 | 720 if ((TraceDeoptimization || LogCompilation) && (xtty != NULL)) { |
721 ttyLocker ttyl; | |
6843 | 722 xtty->begin_elem("make_not_%scompilable thread='" UINTX_FORMAT "'", |
723 is_osr ? "osr_" : "", os::current_thread_id()); | |
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724 xtty->method(this); |
0 | 725 xtty->stamp(); |
726 xtty->end_elem(); | |
727 } | |
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728 } |
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729 |
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730 bool Method::is_not_compilable(int comp_level) const { |
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731 if (number_of_breakpoints() > 0) |
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732 return true; |
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733 if (is_method_handle_intrinsic()) |
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734 return !is_synthetic(); // the generated adapters must be compiled |
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735 if (comp_level == CompLevel_any) |
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736 return is_not_c1_compilable() || is_not_c2_compilable(); |
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737 if (is_c1_compile(comp_level)) |
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738 return is_not_c1_compilable(); |
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739 if (is_c2_compile(comp_level)) |
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740 return is_not_c2_compilable(); |
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741 return false; |
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742 } |
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743 |
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744 // call this when compiler finds that this method is not compilable |
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745 void Method::set_not_compilable(int comp_level, bool report) { |
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746 print_made_not_compilable(comp_level, /*is_osr*/ false, report); |
1783 | 747 if (comp_level == CompLevel_all) { |
748 set_not_c1_compilable(); | |
749 set_not_c2_compilable(); | |
750 } else { | |
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751 if (is_c1_compile(comp_level)) |
1783 | 752 set_not_c1_compilable(); |
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753 if (is_c2_compile(comp_level)) |
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754 set_not_c2_compilable(); |
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755 } |
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756 CompilationPolicy::policy()->disable_compilation(this); |
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757 } |
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758 |
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759 bool Method::is_not_osr_compilable(int comp_level) const { |
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760 if (is_not_compilable(comp_level)) |
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761 return true; |
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762 if (comp_level == CompLevel_any) |
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763 return is_not_c1_osr_compilable() || is_not_c2_osr_compilable(); |
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764 if (is_c1_compile(comp_level)) |
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765 return is_not_c1_osr_compilable(); |
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766 if (is_c2_compile(comp_level)) |
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767 return is_not_c2_osr_compilable(); |
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768 return false; |
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769 } |
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770 |
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771 void Method::set_not_osr_compilable(int comp_level, bool report) { |
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772 print_made_not_compilable(comp_level, /*is_osr*/ true, report); |
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773 if (comp_level == CompLevel_all) { |
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774 set_not_c1_osr_compilable(); |
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775 set_not_c2_osr_compilable(); |
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776 } else { |
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777 if (is_c1_compile(comp_level)) |
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778 set_not_c1_osr_compilable(); |
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779 if (is_c2_compile(comp_level)) |
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780 set_not_c2_osr_compilable(); |
0 | 781 } |
1783 | 782 CompilationPolicy::policy()->disable_compilation(this); |
0 | 783 } |
784 | |
785 // Revert to using the interpreter and clear out the nmethod | |
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786 void Method::clear_code() { |
0 | 787 |
788 // this may be NULL if c2i adapters have not been made yet | |
789 // Only should happen at allocate time. | |
790 if (_adapter == NULL) { | |
791 _from_compiled_entry = NULL; | |
792 } else { | |
793 _from_compiled_entry = _adapter->get_c2i_entry(); | |
794 } | |
795 OrderAccess::storestore(); | |
796 _from_interpreted_entry = _i2i_entry; | |
797 OrderAccess::storestore(); | |
798 _code = NULL; | |
799 } | |
800 | |
801 // Called by class data sharing to remove any entry points (which are not shared) | |
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802 void Method::unlink_method() { |
0 | 803 _code = NULL; |
804 _i2i_entry = NULL; | |
805 _from_interpreted_entry = NULL; | |
806 if (is_native()) { | |
807 *native_function_addr() = NULL; | |
808 set_signature_handler(NULL); | |
809 } | |
810 NOT_PRODUCT(set_compiled_invocation_count(0);) | |
811 invocation_counter()->reset(); | |
812 backedge_counter()->reset(); | |
813 _adapter = NULL; | |
814 _from_compiled_entry = NULL; | |
815 assert(_method_data == NULL, "unexpected method data?"); | |
816 set_method_data(NULL); | |
817 set_interpreter_throwout_count(0); | |
818 set_interpreter_invocation_count(0); | |
819 } | |
820 | |
821 // Called when the method_holder is getting linked. Setup entrypoints so the method | |
822 // is ready to be called from interpreter, compiler, and vtables. | |
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823 void Method::link_method(methodHandle h_method, TRAPS) { |
3748 | 824 // If the code cache is full, we may reenter this function for the |
825 // leftover methods that weren't linked. | |
826 if (_i2i_entry != NULL) return; | |
827 | |
0 | 828 assert(_adapter == NULL, "init'd to NULL" ); |
829 assert( _code == NULL, "nothing compiled yet" ); | |
830 | |
831 // Setup interpreter entrypoint | |
832 assert(this == h_method(), "wrong h_method()" ); | |
833 address entry = Interpreter::entry_for_method(h_method); | |
834 assert(entry != NULL, "interpreter entry must be non-null"); | |
835 // Sets both _i2i_entry and _from_interpreted_entry | |
836 set_interpreter_entry(entry); | |
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837 if (is_native() && !is_method_handle_intrinsic()) { |
0 | 838 set_native_function( |
839 SharedRuntime::native_method_throw_unsatisfied_link_error_entry(), | |
840 !native_bind_event_is_interesting); | |
841 } | |
842 | |
843 // Setup compiler entrypoint. This is made eagerly, so we do not need | |
844 // special handling of vtables. An alternative is to make adapters more | |
845 // lazily by calling make_adapter() from from_compiled_entry() for the | |
846 // normal calls. For vtable calls life gets more complicated. When a | |
847 // call-site goes mega-morphic we need adapters in all methods which can be | |
848 // called from the vtable. We need adapters on such methods that get loaded | |
849 // later. Ditto for mega-morphic itable calls. If this proves to be a | |
850 // problem we'll make these lazily later. | |
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851 (void) make_adapters(h_method, CHECK); |
0 | 852 |
853 // ONLY USE the h_method now as make_adapter may have blocked | |
854 | |
855 } | |
856 | |
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857 address Method::make_adapters(methodHandle mh, TRAPS) { |
0 | 858 // Adapters for compiled code are made eagerly here. They are fairly |
859 // small (generally < 100 bytes) and quick to make (and cached and shared) | |
860 // so making them eagerly shouldn't be too expensive. | |
861 AdapterHandlerEntry* adapter = AdapterHandlerLibrary::get_adapter(mh); | |
862 if (adapter == NULL ) { | |
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863 THROW_MSG_NULL(vmSymbols::java_lang_VirtualMachineError(), "out of space in CodeCache for adapters"); |
0 | 864 } |
865 | |
866 mh->set_adapter_entry(adapter); | |
867 mh->_from_compiled_entry = adapter->get_c2i_entry(); | |
868 return adapter->get_c2i_entry(); | |
869 } | |
870 | |
871 // The verified_code_entry() must be called when a invoke is resolved | |
872 // on this method. | |
873 | |
874 // It returns the compiled code entry point, after asserting not null. | |
875 // This function is called after potential safepoints so that nmethod | |
876 // or adapter that it points to is still live and valid. | |
877 // This function must not hit a safepoint! | |
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878 address Method::verified_code_entry() { |
0 | 879 debug_only(No_Safepoint_Verifier nsv;) |
1202 | 880 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); |
881 if (code == NULL && UseCodeCacheFlushing) { | |
882 nmethod *saved_code = CodeCache::find_and_remove_saved_code(this); | |
883 if (saved_code != NULL) { | |
884 methodHandle method(this); | |
885 assert( ! saved_code->is_osr_method(), "should not get here for osr" ); | |
886 set_code( method, saved_code ); | |
887 } | |
888 } | |
889 | |
0 | 890 assert(_from_compiled_entry != NULL, "must be set"); |
891 return _from_compiled_entry; | |
892 } | |
893 | |
894 // Check that if an nmethod ref exists, it has a backlink to this or no backlink at all | |
895 // (could be racing a deopt). | |
896 // Not inline to avoid circular ref. | |
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897 bool Method::check_code() const { |
0 | 898 // cached in a register or local. There's a race on the value of the field. |
899 nmethod *code = (nmethod *)OrderAccess::load_ptr_acquire(&_code); | |
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900 return code == NULL || (code->method() == NULL) || (code->method() == (Method*)this && !code->is_osr_method()); |
0 | 901 } |
902 | |
903 // Install compiled code. Instantly it can execute. | |
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904 void Method::set_code(methodHandle mh, nmethod *code) { |
0 | 905 assert( code, "use clear_code to remove code" ); |
906 assert( mh->check_code(), "" ); | |
907 | |
908 guarantee(mh->adapter() != NULL, "Adapter blob must already exist!"); | |
909 | |
910 // These writes must happen in this order, because the interpreter will | |
911 // directly jump to from_interpreted_entry which jumps to an i2c adapter | |
912 // which jumps to _from_compiled_entry. | |
913 mh->_code = code; // Assign before allowing compiled code to exec | |
914 | |
915 int comp_level = code->comp_level(); | |
916 // In theory there could be a race here. In practice it is unlikely | |
917 // and not worth worrying about. | |
1783 | 918 if (comp_level > mh->highest_comp_level()) { |
919 mh->set_highest_comp_level(comp_level); | |
0 | 920 } |
921 | |
922 OrderAccess::storestore(); | |
1692 | 923 #ifdef SHARK |
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924 mh->_from_interpreted_entry = code->insts_begin(); |
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925 #else //!SHARK |
0 | 926 mh->_from_compiled_entry = code->verified_entry_point(); |
927 OrderAccess::storestore(); | |
928 // Instantly compiled code can execute. | |
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929 if (!mh->is_method_handle_intrinsic()) |
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930 mh->_from_interpreted_entry = mh->get_i2c_entry(); |
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931 #endif //!SHARK |
0 | 932 } |
933 | |
934 | |
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935 bool Method::is_overridden_in(Klass* k) const { |
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936 InstanceKlass* ik = InstanceKlass::cast(k); |
0 | 937 |
938 if (ik->is_interface()) return false; | |
939 | |
940 // If method is an interface, we skip it - except if it | |
941 // is a miranda method | |
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942 if (method_holder()->is_interface()) { |
0 | 943 // Check that method is not a miranda method |
944 if (ik->lookup_method(name(), signature()) == NULL) { | |
945 // No implementation exist - so miranda method | |
946 return false; | |
947 } | |
948 return true; | |
949 } | |
950 | |
951 assert(ik->is_subclass_of(method_holder()), "should be subklass"); | |
952 assert(ik->vtable() != NULL, "vtable should exist"); | |
953 if (vtable_index() == nonvirtual_vtable_index) { | |
954 return false; | |
955 } else { | |
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956 Method* vt_m = ik->method_at_vtable(vtable_index()); |
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957 return vt_m != this; |
0 | 958 } |
959 } | |
960 | |
961 | |
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962 // give advice about whether this Method* should be cached or not |
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963 bool Method::should_not_be_cached() const { |
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964 if (is_old()) { |
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965 // This method has been redefined. It is either EMCP or obsolete |
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966 // and we don't want to cache it because that would pin the method |
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967 // down and prevent it from being collectible if and when it |
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968 // finishes executing. |
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969 return true; |
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970 } |
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971 |
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972 // caching this method should be just fine |
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973 return false; |
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974 } |
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975 |
710 | 976 // Constant pool structure for invoke methods: |
977 enum { | |
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978 _imcp_invoke_name = 1, // utf8: 'invokeExact', etc. |
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979 _imcp_invoke_signature, // utf8: (variable Symbol*) |
710 | 980 _imcp_limit |
981 }; | |
982 | |
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983 // Test if this method is an MH adapter frame generated by Java code. |
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984 // Cf. java/lang/invoke/InvokerBytecodeGenerator |
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985 bool Method::is_compiled_lambda_form() const { |
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986 return intrinsic_id() == vmIntrinsics::_compiledLambdaForm; |
710 | 987 } |
988 | |
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989 // Test if this method is an internal MH primitive method. |
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990 bool Method::is_method_handle_intrinsic() const { |
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991 vmIntrinsics::ID iid = intrinsic_id(); |
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992 return (MethodHandles::is_signature_polymorphic(iid) && |
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993 MethodHandles::is_signature_polymorphic_intrinsic(iid)); |
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994 } |
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995 |
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996 bool Method::has_member_arg() const { |
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997 vmIntrinsics::ID iid = intrinsic_id(); |
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998 return (MethodHandles::is_signature_polymorphic(iid) && |
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999 MethodHandles::has_member_arg(iid)); |
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1000 } |
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1001 |
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1002 // Make an instance of a signature-polymorphic internal MH primitive. |
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1003 methodHandle Method::make_method_handle_intrinsic(vmIntrinsics::ID iid, |
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1004 Symbol* signature, |
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1005 TRAPS) { |
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1006 ResourceMark rm; |
710 | 1007 methodHandle empty; |
1008 | |
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1009 KlassHandle holder = SystemDictionary::MethodHandle_klass(); |
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1010 Symbol* name = MethodHandles::signature_polymorphic_intrinsic_name(iid); |
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1011 assert(iid == MethodHandles::signature_polymorphic_name_id(name), ""); |
710 | 1012 if (TraceMethodHandles) { |
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1013 tty->print_cr("make_method_handle_intrinsic MH.%s%s", name->as_C_string(), signature->as_C_string()); |
710 | 1014 } |
1015 | |
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1016 // invariant: cp->symbol_at_put is preceded by a refcount increment (more usually a lookup) |
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1017 name->increment_refcount(); |
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1018 signature->increment_refcount(); |
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1019 |
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1020 int cp_length = _imcp_limit; |
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1021 ClassLoaderData* loader_data = holder->class_loader_data(); |
710 | 1022 constantPoolHandle cp; |
1023 { | |
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1024 ConstantPool* cp_oop = ConstantPool::allocate(loader_data, cp_length, CHECK_(empty)); |
710 | 1025 cp = constantPoolHandle(THREAD, cp_oop); |
1026 } | |
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1027 cp->set_pool_holder(InstanceKlass::cast(holder())); |
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1028 cp->symbol_at_put(_imcp_invoke_name, name); |
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1029 cp->symbol_at_put(_imcp_invoke_signature, signature); |
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1030 cp->set_preresolution(); |
710 | 1031 |
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1032 // decide on access bits: public or not? |
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1033 int flags_bits = (JVM_ACC_NATIVE | JVM_ACC_SYNTHETIC | JVM_ACC_FINAL); |
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1034 bool must_be_static = MethodHandles::is_signature_polymorphic_static(iid); |
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1035 if (must_be_static) flags_bits |= JVM_ACC_STATIC; |
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1036 assert((flags_bits & JVM_ACC_PUBLIC) == 0, "do not expose these methods"); |
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1037 |
710 | 1038 methodHandle m; |
1039 { | |
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1040 Method* m_oop = Method::allocate(loader_data, 0, |
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1041 accessFlags_from(flags_bits), |
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1042 0, 0, 0, 0, 0, 0, |
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1043 ConstMethod::NORMAL, CHECK_(empty)); |
710 | 1044 m = methodHandle(THREAD, m_oop); |
1045 } | |
1046 m->set_constants(cp()); | |
1047 m->set_name_index(_imcp_invoke_name); | |
1048 m->set_signature_index(_imcp_invoke_signature); | |
6266
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1049 assert(MethodHandles::is_signature_polymorphic_name(m->name()), ""); |
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1050 assert(m->signature() == signature, ""); |
710 | 1051 #ifdef CC_INTERP |
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1052 ResultTypeFinder rtf(signature); |
710 | 1053 m->set_result_index(rtf.type()); |
1054 #endif | |
1055 m->compute_size_of_parameters(THREAD); | |
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1056 m->init_intrinsic_id(); |
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1057 assert(m->is_method_handle_intrinsic(), ""); |
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1058 #ifdef ASSERT |
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1059 if (!MethodHandles::is_signature_polymorphic(m->intrinsic_id())) m->print(); |
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1060 assert(MethodHandles::is_signature_polymorphic(m->intrinsic_id()), "must be an invoker"); |
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1061 assert(m->intrinsic_id() == iid, "correctly predicted iid"); |
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1062 #endif //ASSERT |
710 | 1063 |
1064 // Finally, set up its entry points. | |
1065 assert(m->can_be_statically_bound(), ""); | |
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1066 m->set_vtable_index(Method::nonvirtual_vtable_index); |
710 | 1067 m->link_method(m, CHECK_(empty)); |
1068 | |
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1069 if (TraceMethodHandles && (Verbose || WizardMode)) |
710 | 1070 m->print_on(tty); |
1071 | |
1072 return m; | |
1073 } | |
1074 | |
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1075 Klass* Method::check_non_bcp_klass(Klass* klass) { |
6983 | 1076 if (klass != NULL && klass->class_loader() != NULL) { |
1077 if (klass->oop_is_objArray()) | |
6831
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1078 klass = ObjArrayKlass::cast(klass)->bottom_klass(); |
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1079 return klass; |
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1080 } |
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1081 return NULL; |
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1082 } |
710 | 1083 |
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1084 |
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1085 methodHandle Method::clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length, |
0 | 1086 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS) { |
1087 // Code below does not work for native methods - they should never get rewritten anyway | |
1088 assert(!m->is_native(), "cannot rewrite native methods"); | |
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1089 // Allocate new Method* |
0 | 1090 AccessFlags flags = m->access_flags(); |
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1091 u2 generic_signature_index = m->generic_signature_index(); |
0 | 1092 int checked_exceptions_len = m->checked_exceptions_length(); |
1093 int localvariable_len = m->localvariable_table_length(); | |
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1094 int exception_table_len = m->exception_table_length(); |
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1095 int method_parameters_len = m->method_parameters_length(); |
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1096 |
6934 | 1097 ClassLoaderData* loader_data = m->method_holder()->class_loader_data(); |
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1098 Method* newm_oop = Method::allocate(loader_data, |
6934 | 1099 new_code_length, |
1100 flags, | |
1101 new_compressed_linenumber_size, | |
1102 localvariable_len, | |
1103 exception_table_len, | |
1104 checked_exceptions_len, | |
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1105 method_parameters_len, |
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1106 generic_signature_index, |
6934 | 1107 m->method_type(), |
1108 CHECK_(methodHandle())); | |
0 | 1109 methodHandle newm (THREAD, newm_oop); |
1110 int new_method_size = newm->method_size(); | |
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1111 |
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1112 // Create a shallow copy of Method part, but be careful to preserve the new ConstMethod* |
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1113 ConstMethod* newcm = newm->constMethod(); |
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1114 int new_const_method_size = newm->constMethod()->size(); |
2226
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1115 |
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1116 memcpy(newm(), m(), sizeof(Method)); |
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1117 |
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1118 // Create shallow copy of ConstMethod. |
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1119 memcpy(newcm, m->constMethod(), sizeof(ConstMethod)); |
2226
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1120 |
0 | 1121 // Reset correct method/const method, method size, and parameter info |
1122 newm->set_constMethod(newcm); | |
1123 newm->constMethod()->set_code_size(new_code_length); | |
1124 newm->constMethod()->set_constMethod_size(new_const_method_size); | |
1125 newm->set_method_size(new_method_size); | |
1126 assert(newm->code_size() == new_code_length, "check"); | |
1127 assert(newm->checked_exceptions_length() == checked_exceptions_len, "check"); | |
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1128 assert(newm->exception_table_length() == exception_table_len, "check"); |
0 | 1129 assert(newm->localvariable_table_length() == localvariable_len, "check"); |
1130 // Copy new byte codes | |
1131 memcpy(newm->code_base(), new_code, new_code_length); | |
1132 // Copy line number table | |
1133 if (new_compressed_linenumber_size > 0) { | |
1134 memcpy(newm->compressed_linenumber_table(), | |
1135 new_compressed_linenumber_table, | |
1136 new_compressed_linenumber_size); | |
1137 } | |
1138 // Copy checked_exceptions | |
1139 if (checked_exceptions_len > 0) { | |
1140 memcpy(newm->checked_exceptions_start(), | |
1141 m->checked_exceptions_start(), | |
1142 checked_exceptions_len * sizeof(CheckedExceptionElement)); | |
1143 } | |
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1144 // Copy exception table |
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1145 if (exception_table_len > 0) { |
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1146 memcpy(newm->exception_table_start(), |
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1147 m->exception_table_start(), |
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1148 exception_table_len * sizeof(ExceptionTableElement)); |
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1149 } |
0 | 1150 // Copy local variable number table |
1151 if (localvariable_len > 0) { | |
1152 memcpy(newm->localvariable_table_start(), | |
1153 m->localvariable_table_start(), | |
1154 localvariable_len * sizeof(LocalVariableTableElement)); | |
1155 } | |
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1156 // Copy stackmap table |
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1157 if (m->has_stackmap_table()) { |
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1158 int code_attribute_length = m->stackmap_data()->length(); |
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1159 Array<u1>* stackmap_data = |
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1160 MetadataFactory::new_array<u1>(loader_data, code_attribute_length, 0, CHECK_NULL); |
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1161 memcpy((void*)stackmap_data->adr_at(0), |
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1162 (void*)m->stackmap_data()->adr_at(0), code_attribute_length); |
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1163 newm->set_stackmap_data(stackmap_data); |
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1164 } |
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1165 |
0 | 1166 return newm; |
1167 } | |
1168 | |
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1169 vmSymbols::SID Method::klass_id_for_intrinsics(Klass* holder) { |
0 | 1170 // if loader is not the default loader (i.e., != NULL), we can't know the intrinsics |
1171 // because we are not loading from core libraries | |
6894 | 1172 // exception: the AES intrinsics come from lib/ext/sunjce_provider.jar |
1173 // which does not use the class default class loader so we check for its loader here | |
1174 if ((InstanceKlass::cast(holder)->class_loader() != NULL) && | |
1175 InstanceKlass::cast(holder)->class_loader()->klass()->name() != vmSymbols::sun_misc_Launcher_ExtClassLoader()) { | |
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1176 return vmSymbols::NO_SID; // regardless of name, no intrinsics here |
6894 | 1177 } |
0 | 1178 |
1179 // see if the klass name is well-known: | |
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1180 Symbol* klass_name = InstanceKlass::cast(holder)->name(); |
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1181 return vmSymbols::find_sid(klass_name); |
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1182 } |
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1183 |
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1184 void Method::init_intrinsic_id() { |
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1185 assert(_intrinsic_id == vmIntrinsics::_none, "do this just once"); |
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1186 const uintptr_t max_id_uint = right_n_bits((int)(sizeof(_intrinsic_id) * BitsPerByte)); |
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1187 assert((uintptr_t)vmIntrinsics::ID_LIMIT <= max_id_uint, "else fix size"); |
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1188 assert(intrinsic_id_size_in_bytes() == sizeof(_intrinsic_id), ""); |
856
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1189 |
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1190 // the klass name is well-known: |
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1191 vmSymbols::SID klass_id = klass_id_for_intrinsics(method_holder()); |
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1192 assert(klass_id != vmSymbols::NO_SID, "caller responsibility"); |
0 | 1193 |
1194 // ditto for method and signature: | |
1195 vmSymbols::SID name_id = vmSymbols::find_sid(name()); | |
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1196 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1197 && name_id == vmSymbols::NO_SID) |
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1198 return; |
0 | 1199 vmSymbols::SID sig_id = vmSymbols::find_sid(signature()); |
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1200 if (klass_id != vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle) |
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1201 && sig_id == vmSymbols::NO_SID) return; |
0 | 1202 jshort flags = access_flags().as_short(); |
1203 | |
856
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1204 vmIntrinsics::ID id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
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1205 if (id != vmIntrinsics::_none) { |
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1206 set_intrinsic_id(id); |
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1207 return; |
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1208 } |
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1209 |
0 | 1210 // A few slightly irregular cases: |
1211 switch (klass_id) { | |
1212 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_StrictMath): | |
1213 // Second chance: check in regular Math. | |
1214 switch (name_id) { | |
1215 case vmSymbols::VM_SYMBOL_ENUM_NAME(min_name): | |
1216 case vmSymbols::VM_SYMBOL_ENUM_NAME(max_name): | |
1217 case vmSymbols::VM_SYMBOL_ENUM_NAME(sqrt_name): | |
1218 // pretend it is the corresponding method in the non-strict class: | |
1219 klass_id = vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_Math); | |
856
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1220 id = vmIntrinsics::find_id(klass_id, name_id, sig_id, flags); |
0 | 1221 break; |
1222 } | |
1507
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1223 break; |
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1224 |
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1225 // Signature-polymorphic methods: MethodHandle.invoke*, InvokeDynamic.*. |
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1226 case vmSymbols::VM_SYMBOL_ENUM_NAME(java_lang_invoke_MethodHandle): |
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1227 if (!is_native()) break; |
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1228 id = MethodHandles::signature_polymorphic_name_id(method_holder(), name()); |
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1229 if (is_static() != MethodHandles::is_signature_polymorphic_static(id)) |
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1230 id = vmIntrinsics::_none; |
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1231 break; |
0 | 1232 } |
1233 | |
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1234 if (id != vmIntrinsics::_none) { |
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1235 // Set up its iid. It is an alias method. |
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1236 set_intrinsic_id(id); |
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1237 return; |
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1238 } |
0 | 1239 } |
1240 | |
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1241 // These two methods are static since a GC may move the Method |
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1242 bool Method::load_signature_classes(methodHandle m, TRAPS) { |
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1243 if (THREAD->is_Compiler_thread()) { |
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1244 // There is nothing useful this routine can do from within the Compile thread. |
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1245 // Hopefully, the signature contains only well-known classes. |
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1246 // We could scan for this and return true/false, but the caller won't care. |
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1247 return false; |
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1248 } |
0 | 1249 bool sig_is_loaded = true; |
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1250 Handle class_loader(THREAD, m->method_holder()->class_loader()); |
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1251 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); |
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1252 ResourceMark rm(THREAD); |
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1253 Symbol* signature = m->signature(); |
0 | 1254 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1255 if (ss.is_object()) { | |
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1256 Symbol* sym = ss.as_symbol(CHECK_(false)); |
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1257 Symbol* name = sym; |
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1258 Klass* klass = SystemDictionary::resolve_or_null(name, class_loader, |
0 | 1259 protection_domain, THREAD); |
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1260 // We are loading classes eagerly. If a ClassNotFoundException or |
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1261 // a LinkageError was generated, be sure to ignore it. |
0 | 1262 if (HAS_PENDING_EXCEPTION) { |
1142 | 1263 if (PENDING_EXCEPTION->is_a(SystemDictionary::ClassNotFoundException_klass()) || |
1264 PENDING_EXCEPTION->is_a(SystemDictionary::LinkageError_klass())) { | |
0 | 1265 CLEAR_PENDING_EXCEPTION; |
1266 } else { | |
1267 return false; | |
1268 } | |
1269 } | |
1270 if( klass == NULL) { sig_is_loaded = false; } | |
1271 } | |
1272 } | |
1273 return sig_is_loaded; | |
1274 } | |
1275 | |
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1276 bool Method::has_unloaded_classes_in_signature(methodHandle m, TRAPS) { |
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1277 Handle class_loader(THREAD, m->method_holder()->class_loader()); |
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1278 Handle protection_domain(THREAD, m->method_holder()->protection_domain()); |
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1279 ResourceMark rm(THREAD); |
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1280 Symbol* signature = m->signature(); |
0 | 1281 for(SignatureStream ss(signature); !ss.is_done(); ss.next()) { |
1282 if (ss.type() == T_OBJECT) { | |
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1283 Symbol* name = ss.as_symbol_or_null(); |
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1284 if (name == NULL) return true; |
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1285 Klass* klass = SystemDictionary::find(name, class_loader, protection_domain, THREAD); |
0 | 1286 if (klass == NULL) return true; |
1287 } | |
1288 } | |
1289 return false; | |
1290 } | |
1291 | |
1292 // Exposed so field engineers can debug VM | |
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1293 void Method::print_short_name(outputStream* st) { |
0 | 1294 ResourceMark rm; |
1295 #ifdef PRODUCT | |
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1296 st->print(" %s::", method_holder()->external_name()); |
0 | 1297 #else |
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1298 st->print(" %s::", method_holder()->internal_name()); |
0 | 1299 #endif |
1300 name()->print_symbol_on(st); | |
1301 if (WizardMode) signature()->print_symbol_on(st); | |
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1302 else if (MethodHandles::is_signature_polymorphic(intrinsic_id())) |
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1303 MethodHandles::print_as_basic_type_signature_on(st, signature(), true); |
0 | 1304 } |
1305 | |
1306 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
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1307 static void reorder_based_on_method_index(Array<Method*>* methods, |
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1308 Array<AnnotationArray*>* annotations, |
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1309 GrowableArray<AnnotationArray*>* temp_array) { |
0 | 1310 if (annotations == NULL) { |
1311 return; | |
1312 } | |
1313 | |
1314 int length = methods->length(); | |
1315 int i; | |
1316 // Copy to temp array | |
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1317 temp_array->clear(); |
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1318 for (i = 0; i < length; i++) { |
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1319 temp_array->append(annotations->at(i)); |
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1320 } |
0 | 1321 |
1322 // Copy back using old method indices | |
1323 for (i = 0; i < length; i++) { | |
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1324 Method* m = methods->at(i); |
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1325 annotations->at_put(i, temp_array->at(m->method_idnum())); |
0 | 1326 } |
1327 } | |
1328 | |
3779 | 1329 // Comparer for sorting an object array containing |
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1330 // Method*s. |
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1331 static int method_comparator(Method* a, Method* b) { |
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1332 return a->name()->fast_compare(b->name()); |
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1333 } |
0 | 1334 |
1335 // This is only done during class loading, so it is OK to assume method_idnum matches the methods() array | |
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1336 void Method::sort_methods(Array<Method*>* methods, |
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1337 Array<AnnotationArray*>* methods_annotations, |
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1338 Array<AnnotationArray*>* methods_parameter_annotations, |
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1339 Array<AnnotationArray*>* methods_default_annotations, |
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1340 Array<AnnotationArray*>* methods_type_annotations, |
0 | 1341 bool idempotent) { |
1342 int length = methods->length(); | |
1343 if (length > 1) { | |
1344 bool do_annotations = false; | |
1345 if (methods_annotations != NULL || | |
1346 methods_parameter_annotations != NULL || | |
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1347 methods_default_annotations != NULL || |
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1348 methods_type_annotations != NULL) { |
0 | 1349 do_annotations = true; |
1350 } | |
1351 if (do_annotations) { | |
1352 // Remember current method ordering so we can reorder annotations | |
1353 for (int i = 0; i < length; i++) { | |
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1354 Method* m = methods->at(i); |
0 | 1355 m->set_method_idnum(i); |
1356 } | |
1357 } | |
3779 | 1358 { |
1359 No_Safepoint_Verifier nsv; | |
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1360 QuickSort::sort<Method*>(methods->data(), length, method_comparator, idempotent); |
0 | 1361 } |
1362 | |
1363 // Sort annotations if necessary | |
1364 assert(methods_annotations == NULL || methods_annotations->length() == methods->length(), ""); | |
1365 assert(methods_parameter_annotations == NULL || methods_parameter_annotations->length() == methods->length(), ""); | |
1366 assert(methods_default_annotations == NULL || methods_default_annotations->length() == methods->length(), ""); | |
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1367 assert(methods_type_annotations == NULL || methods_type_annotations->length() == methods->length(), ""); |
0 | 1368 if (do_annotations) { |
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1369 ResourceMark rm; |
0 | 1370 // Allocate temporary storage |
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1371 GrowableArray<AnnotationArray*>* temp_array = new GrowableArray<AnnotationArray*>(length); |
0 | 1372 reorder_based_on_method_index(methods, methods_annotations, temp_array); |
1373 reorder_based_on_method_index(methods, methods_parameter_annotations, temp_array); | |
1374 reorder_based_on_method_index(methods, methods_default_annotations, temp_array); | |
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1375 reorder_based_on_method_index(methods, methods_type_annotations, temp_array); |
0 | 1376 } |
1377 | |
1378 // Reset method ordering | |
1379 for (int i = 0; i < length; i++) { | |
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1380 Method* m = methods->at(i); |
0 | 1381 m->set_method_idnum(i); |
1382 } | |
1383 } | |
1384 } | |
1385 | |
1386 | |
1387 //----------------------------------------------------------------------------------- | |
1388 // Non-product code | |
1389 | |
1390 #ifndef PRODUCT | |
1391 class SignatureTypePrinter : public SignatureTypeNames { | |
1392 private: | |
1393 outputStream* _st; | |
1394 bool _use_separator; | |
1395 | |
1396 void type_name(const char* name) { | |
1397 if (_use_separator) _st->print(", "); | |
1398 _st->print(name); | |
1399 _use_separator = true; | |
1400 } | |
1401 | |
1402 public: | |
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1403 SignatureTypePrinter(Symbol* signature, outputStream* st) : SignatureTypeNames(signature) { |
0 | 1404 _st = st; |
1405 _use_separator = false; | |
1406 } | |
1407 | |
1408 void print_parameters() { _use_separator = false; iterate_parameters(); } | |
1409 void print_returntype() { _use_separator = false; iterate_returntype(); } | |
1410 }; | |
1411 | |
1412 | |
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1413 void Method::print_name(outputStream* st) { |
0 | 1414 Thread *thread = Thread::current(); |
1415 ResourceMark rm(thread); | |
1416 SignatureTypePrinter sig(signature(), st); | |
1417 st->print("%s ", is_static() ? "static" : "virtual"); | |
1418 sig.print_returntype(); | |
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1419 st->print(" %s.", method_holder()->internal_name()); |
0 | 1420 name()->print_symbol_on(st); |
1421 st->print("("); | |
1422 sig.print_parameters(); | |
1423 st->print(")"); | |
1424 } | |
1425 | |
1426 | |
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1427 void Method::print_codes_on(outputStream* st) const { |
0 | 1428 print_codes_on(0, code_size(), st); |
1429 } | |
1430 | |
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1431 void Method::print_codes_on(int from, int to, outputStream* st) const { |
0 | 1432 Thread *thread = Thread::current(); |
1433 ResourceMark rm(thread); | |
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1434 methodHandle mh (thread, (Method*)this); |
0 | 1435 BytecodeStream s(mh); |
1436 s.set_interval(from, to); | |
1437 BytecodeTracer::set_closure(BytecodeTracer::std_closure()); | |
1438 while (s.next() >= 0) BytecodeTracer::trace(mh, s.bcp(), st); | |
1439 } | |
1440 #endif // not PRODUCT | |
1441 | |
1442 | |
1443 // Simple compression of line number tables. We use a regular compressed stream, except that we compress deltas | |
1444 // between (bci,line) pairs since they are smaller. If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned) | |
1445 // we save it as one byte, otherwise we write a 0xFF escape character and use regular compression. 0x0 is used | |
1446 // as end-of-stream terminator. | |
1447 | |
1448 void CompressedLineNumberWriteStream::write_pair_regular(int bci_delta, int line_delta) { | |
1449 // bci and line number does not compress into single byte. | |
1450 // Write out escape character and use regular compression for bci and line number. | |
1451 write_byte((jubyte)0xFF); | |
1452 write_signed_int(bci_delta); | |
1453 write_signed_int(line_delta); | |
1454 } | |
1455 | |
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1456 // See comment in method.hpp which explains why this exists. |
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1457 #if defined(_M_AMD64) && _MSC_VER >= 1400 |
0 | 1458 #pragma optimize("", off) |
1459 void CompressedLineNumberWriteStream::write_pair(int bci, int line) { | |
1460 write_pair_inline(bci, line); | |
1461 } | |
1462 #pragma optimize("", on) | |
1463 #endif | |
1464 | |
1465 CompressedLineNumberReadStream::CompressedLineNumberReadStream(u_char* buffer) : CompressedReadStream(buffer) { | |
1466 _bci = 0; | |
1467 _line = 0; | |
1468 }; | |
1469 | |
1470 | |
1471 bool CompressedLineNumberReadStream::read_pair() { | |
1472 jubyte next = read_byte(); | |
1473 // Check for terminator | |
1474 if (next == 0) return false; | |
1475 if (next == 0xFF) { | |
1476 // Escape character, regular compression used | |
1477 _bci += read_signed_int(); | |
1478 _line += read_signed_int(); | |
1479 } else { | |
1480 // Single byte compression used | |
1481 _bci += next >> 3; | |
1482 _line += next & 0x7; | |
1483 } | |
1484 return true; | |
1485 } | |
1486 | |
1487 | |
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1488 Bytecodes::Code Method::orig_bytecode_at(int bci) const { |
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1489 BreakpointInfo* bp = method_holder()->breakpoints(); |
0 | 1490 for (; bp != NULL; bp = bp->next()) { |
1491 if (bp->match(this, bci)) { | |
1492 return bp->orig_bytecode(); | |
1493 } | |
1494 } | |
1495 ShouldNotReachHere(); | |
1496 return Bytecodes::_shouldnotreachhere; | |
1497 } | |
1498 | |
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1499 void Method::set_orig_bytecode_at(int bci, Bytecodes::Code code) { |
0 | 1500 assert(code != Bytecodes::_breakpoint, "cannot patch breakpoints this way"); |
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1501 BreakpointInfo* bp = method_holder()->breakpoints(); |
0 | 1502 for (; bp != NULL; bp = bp->next()) { |
1503 if (bp->match(this, bci)) { | |
1504 bp->set_orig_bytecode(code); | |
1505 // and continue, in case there is more than one | |
1506 } | |
1507 } | |
1508 } | |
1509 | |
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1510 void Method::set_breakpoint(int bci) { |
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1511 InstanceKlass* ik = method_holder(); |
0 | 1512 BreakpointInfo *bp = new BreakpointInfo(this, bci); |
1513 bp->set_next(ik->breakpoints()); | |
1514 ik->set_breakpoints(bp); | |
1515 // do this last: | |
1516 bp->set(this); | |
1517 } | |
1518 | |
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1519 static void clear_matches(Method* m, int bci) { |
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1520 InstanceKlass* ik = m->method_holder(); |
0 | 1521 BreakpointInfo* prev_bp = NULL; |
1522 BreakpointInfo* next_bp; | |
1523 for (BreakpointInfo* bp = ik->breakpoints(); bp != NULL; bp = next_bp) { | |
1524 next_bp = bp->next(); | |
1525 // bci value of -1 is used to delete all breakpoints in method m (ex: clear_all_breakpoint). | |
1526 if (bci >= 0 ? bp->match(m, bci) : bp->match(m)) { | |
1527 // do this first: | |
1528 bp->clear(m); | |
1529 // unhook it | |
1530 if (prev_bp != NULL) | |
1531 prev_bp->set_next(next_bp); | |
1532 else | |
1533 ik->set_breakpoints(next_bp); | |
1534 delete bp; | |
1535 // When class is redefined JVMTI sets breakpoint in all versions of EMCP methods | |
1536 // at same location. So we have multiple matching (method_index and bci) | |
1537 // BreakpointInfo nodes in BreakpointInfo list. We should just delete one | |
1538 // breakpoint for clear_breakpoint request and keep all other method versions | |
1539 // BreakpointInfo for future clear_breakpoint request. | |
1540 // bcivalue of -1 is used to clear all breakpoints (see clear_all_breakpoints) | |
1541 // which is being called when class is unloaded. We delete all the Breakpoint | |
1542 // information for all versions of method. We may not correctly restore the original | |
1543 // bytecode in all method versions, but that is ok. Because the class is being unloaded | |
1544 // so these methods won't be used anymore. | |
1545 if (bci >= 0) { | |
1546 break; | |
1547 } | |
1548 } else { | |
1549 // This one is a keeper. | |
1550 prev_bp = bp; | |
1551 } | |
1552 } | |
1553 } | |
1554 | |
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1555 void Method::clear_breakpoint(int bci) { |
0 | 1556 assert(bci >= 0, ""); |
1557 clear_matches(this, bci); | |
1558 } | |
1559 | |
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1560 void Method::clear_all_breakpoints() { |
0 | 1561 clear_matches(this, -1); |
1562 } | |
1563 | |
1564 | |
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1565 int Method::invocation_count() { |
1783 | 1566 if (TieredCompilation) { |
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1567 MethodData* const mdo = method_data(); |
1783 | 1568 if (invocation_counter()->carry() || ((mdo != NULL) ? mdo->invocation_counter()->carry() : false)) { |
1569 return InvocationCounter::count_limit; | |
1570 } else { | |
1571 return invocation_counter()->count() + ((mdo != NULL) ? mdo->invocation_counter()->count() : 0); | |
1572 } | |
1573 } else { | |
1574 return invocation_counter()->count(); | |
1575 } | |
1576 } | |
1577 | |
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1578 int Method::backedge_count() { |
1783 | 1579 if (TieredCompilation) { |
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1580 MethodData* const mdo = method_data(); |
1783 | 1581 if (backedge_counter()->carry() || ((mdo != NULL) ? mdo->backedge_counter()->carry() : false)) { |
1582 return InvocationCounter::count_limit; | |
1583 } else { | |
1584 return backedge_counter()->count() + ((mdo != NULL) ? mdo->backedge_counter()->count() : 0); | |
1585 } | |
1586 } else { | |
1587 return backedge_counter()->count(); | |
1588 } | |
1589 } | |
1590 | |
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1591 int Method::highest_comp_level() const { |
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1592 MethodData* mdo = method_data(); |
1783 | 1593 if (mdo != NULL) { |
1594 return mdo->highest_comp_level(); | |
1595 } else { | |
1596 return CompLevel_none; | |
1597 } | |
1598 } | |
1599 | |
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1600 int Method::highest_osr_comp_level() const { |
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1601 MethodData* mdo = method_data(); |
1783 | 1602 if (mdo != NULL) { |
1603 return mdo->highest_osr_comp_level(); | |
1604 } else { | |
1605 return CompLevel_none; | |
1606 } | |
1607 } | |
1608 | |
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1609 void Method::set_highest_comp_level(int level) { |
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1610 MethodData* mdo = method_data(); |
1783 | 1611 if (mdo != NULL) { |
1612 mdo->set_highest_comp_level(level); | |
1613 } | |
1614 } | |
1615 | |
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1616 void Method::set_highest_osr_comp_level(int level) { |
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1617 MethodData* mdo = method_data(); |
1783 | 1618 if (mdo != NULL) { |
1619 mdo->set_highest_osr_comp_level(level); | |
1620 } | |
1621 } | |
1622 | |
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1623 BreakpointInfo::BreakpointInfo(Method* m, int bci) { |
0 | 1624 _bci = bci; |
1625 _name_index = m->name_index(); | |
1626 _signature_index = m->signature_index(); | |
1627 _orig_bytecode = (Bytecodes::Code) *m->bcp_from(_bci); | |
1628 if (_orig_bytecode == Bytecodes::_breakpoint) | |
1629 _orig_bytecode = m->orig_bytecode_at(_bci); | |
1630 _next = NULL; | |
1631 } | |
1632 | |
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1633 void BreakpointInfo::set(Method* method) { |
0 | 1634 #ifdef ASSERT |
1635 { | |
1636 Bytecodes::Code code = (Bytecodes::Code) *method->bcp_from(_bci); | |
1637 if (code == Bytecodes::_breakpoint) | |
1638 code = method->orig_bytecode_at(_bci); | |
1639 assert(orig_bytecode() == code, "original bytecode must be the same"); | |
1640 } | |
1641 #endif | |
1642 *method->bcp_from(_bci) = Bytecodes::_breakpoint; | |
1643 method->incr_number_of_breakpoints(); | |
1644 SystemDictionary::notice_modification(); | |
1645 { | |
1646 // Deoptimize all dependents on this method | |
1647 Thread *thread = Thread::current(); | |
1648 HandleMark hm(thread); | |
1649 methodHandle mh(thread, method); | |
1650 Universe::flush_dependents_on_method(mh); | |
1651 } | |
1652 } | |
1653 | |
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1654 void BreakpointInfo::clear(Method* method) { |
0 | 1655 *method->bcp_from(_bci) = orig_bytecode(); |
1656 assert(method->number_of_breakpoints() > 0, "must not go negative"); | |
1657 method->decr_number_of_breakpoints(); | |
1658 } | |
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1659 |
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1660 // jmethodID handling |
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1661 |
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1662 // This is a block allocating object, sort of like JNIHandleBlock, only a |
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1663 // lot simpler. There aren't many of these, they aren't long, they are rarely |
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1664 // deleted and so we can do some suboptimal things. |
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1665 // It's allocated on the CHeap because once we allocate a jmethodID, we can |
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1666 // never get rid of it. |
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1667 // It would be nice to be able to parameterize the number of methods for |
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1668 // the null_class_loader but then we'd have to turn this and ClassLoaderData |
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1669 // into templates. |
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1670 |
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1671 // I feel like this brain dead class should exist somewhere in the STL |
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1672 |
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1673 class JNIMethodBlock : public CHeapObj<mtClass> { |
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1674 enum { number_of_methods = 8 }; |
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1675 |
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1676 Method* _methods[number_of_methods]; |
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1677 int _top; |
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1678 JNIMethodBlock* _next; |
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1679 public: |
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1680 static Method* const _free_method; |
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1681 |
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1682 JNIMethodBlock() : _next(NULL), _top(0) { |
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1683 for (int i = 0; i< number_of_methods; i++) _methods[i] = _free_method; |
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1684 } |
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1685 |
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1686 Method** add_method(Method* m) { |
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1687 if (_top < number_of_methods) { |
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1688 // top points to the next free entry. |
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1689 int i = _top; |
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1690 _methods[i] = m; |
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1691 _top++; |
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1692 return &_methods[i]; |
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1693 } else if (_top == number_of_methods) { |
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1694 // if the next free entry ran off the block see if there's a free entry |
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1695 for (int i = 0; i< number_of_methods; i++) { |
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1696 if (_methods[i] == _free_method) { |
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1697 _methods[i] = m; |
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1698 return &_methods[i]; |
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1699 } |
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1700 } |
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1701 // Only check each block once for frees. They're very unlikely. |
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1702 // Increment top past the end of the block. |
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1703 _top++; |
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1704 } |
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1705 // need to allocate a next block. |
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1706 if (_next == NULL) { |
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1707 _next = new JNIMethodBlock(); |
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1708 } |
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1709 return _next->add_method(m); |
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1710 } |
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1711 |
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1712 bool contains(Method** m) { |
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1713 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1714 for (int i = 0; i< number_of_methods; i++) { |
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1715 if (&(b->_methods[i]) == m) { |
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1716 return true; |
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1717 } |
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1718 } |
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1719 } |
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1720 return false; // not found |
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1721 } |
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1722 |
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1723 // Doesn't really destroy it, just marks it as free so it can be reused. |
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1724 void destroy_method(Method** m) { |
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1725 #ifdef ASSERT |
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1726 assert(contains(m), "should be a methodID"); |
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1727 #endif // ASSERT |
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1728 *m = _free_method; |
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1729 } |
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1730 |
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1731 // During class unloading the methods are cleared, which is different |
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1732 // than freed. |
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1733 void clear_all_methods() { |
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1734 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1735 for (int i = 0; i< number_of_methods; i++) { |
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1736 _methods[i] = NULL; |
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1737 } |
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1738 } |
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1739 } |
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1740 #ifndef PRODUCT |
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1741 int count_methods() { |
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1742 // count all allocated methods |
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1743 int count = 0; |
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1744 for (JNIMethodBlock* b = this; b != NULL; b = b->_next) { |
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1745 for (int i = 0; i< number_of_methods; i++) { |
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1746 if (_methods[i] != _free_method) count++; |
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1747 } |
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1748 } |
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1749 return count; |
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1750 } |
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1751 #endif // PRODUCT |
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1752 }; |
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1753 |
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1754 // Something that can't be mistaken for an address or a markOop |
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1755 Method* const JNIMethodBlock::_free_method = (Method*)55; |
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1756 |
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1757 // Add a method id to the jmethod_ids |
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1758 jmethodID Method::make_jmethod_id(ClassLoaderData* loader_data, Method* m) { |
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1759 ClassLoaderData* cld = loader_data; |
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1760 |
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1761 if (!SafepointSynchronize::is_at_safepoint()) { |
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1762 // Have to add jmethod_ids() to class loader data thread-safely. |
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1763 // Also have to add the method to the list safely, which the cld lock |
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1764 // protects as well. |
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1765 MutexLockerEx ml(cld->metaspace_lock(), Mutex::_no_safepoint_check_flag); |
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1766 if (cld->jmethod_ids() == NULL) { |
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1767 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1768 } |
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1769 // jmethodID is a pointer to Method* |
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1770 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1771 } else { |
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1772 // At safepoint, we are single threaded and can set this. |
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1773 if (cld->jmethod_ids() == NULL) { |
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1774 cld->set_jmethod_ids(new JNIMethodBlock()); |
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1775 } |
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1776 // jmethodID is a pointer to Method* |
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1777 return (jmethodID)cld->jmethod_ids()->add_method(m); |
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1778 } |
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1779 } |
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1780 |
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1781 // Mark a jmethodID as free. This is called when there is a data race in |
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1782 // InstanceKlass while creating the jmethodID cache. |
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1783 void Method::destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID m) { |
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1784 ClassLoaderData* cld = loader_data; |
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1785 Method** ptr = (Method**)m; |
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1786 assert(cld->jmethod_ids() != NULL, "should have method handles"); |
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1787 cld->jmethod_ids()->destroy_method(ptr); |
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1788 } |
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1789 |
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1790 void Method::change_method_associated_with_jmethod_id(jmethodID jmid, Method* new_method) { |
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1791 // Can't assert the method_holder is the same because the new method has the |
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1792 // scratch method holder. |
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1793 assert(resolve_jmethod_id(jmid)->method_holder()->class_loader() |
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1794 == new_method->method_holder()->class_loader(), |
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1795 "changing to a different class loader"); |
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1796 // Just change the method in place, jmethodID pointer doesn't change. |
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1797 *((Method**)jmid) = new_method; |
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1798 } |
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1799 |
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1800 bool Method::is_method_id(jmethodID mid) { |
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1801 Method* m = resolve_jmethod_id(mid); |
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1802 assert(m != NULL, "should be called with non-null method"); |
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1803 InstanceKlass* ik = m->method_holder(); |
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1804 ClassLoaderData* cld = ik->class_loader_data(); |
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1805 if (cld->jmethod_ids() == NULL) return false; |
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1806 return (cld->jmethod_ids()->contains((Method**)mid)); |
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1807 } |
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1808 |
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1809 Method* Method::checked_resolve_jmethod_id(jmethodID mid) { |
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1810 if (mid == NULL) return NULL; |
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1811 Method* o = resolve_jmethod_id(mid); |
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1812 if (o == NULL || o == JNIMethodBlock::_free_method || !((Metadata*)o)->is_method()) { |
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1813 return NULL; |
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1814 } |
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1815 return o; |
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1816 }; |
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1817 |
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1818 void Method::set_on_stack(const bool value) { |
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1819 // Set both the method itself and its constant pool. The constant pool |
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1820 // on stack means some method referring to it is also on the stack. |
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1821 _access_flags.set_on_stack(value); |
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1822 constants()->set_on_stack(value); |
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1823 if (value) MetadataOnStackMark::record(this); |
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1824 } |
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1825 |
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1826 // Called when the class loader is unloaded to make all methods weak. |
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1827 void Method::clear_jmethod_ids(ClassLoaderData* loader_data) { |
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1828 loader_data->jmethod_ids()->clear_all_methods(); |
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1829 } |
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1830 |
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1831 |
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1832 // Check that this pointer is valid by checking that the vtbl pointer matches |
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1833 bool Method::is_valid_method() const { |
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1834 if (this == NULL) { |
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1835 return false; |
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1836 } else if (!is_metaspace_object()) { |
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1837 return false; |
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1838 } else { |
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1839 Method m; |
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1840 // This assumes that the vtbl pointer is the first word of a C++ object. |
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1841 // This assumption is also in universe.cpp patch_klass_vtble |
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1842 void* vtbl2 = dereference_vptr((void*)&m); |
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1843 void* this_vtbl = dereference_vptr((void*)this); |
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1844 return vtbl2 == this_vtbl; |
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1845 } |
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1846 } |
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1847 |
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1848 #ifndef PRODUCT |
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1849 void Method::print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) { |
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1850 out->print_cr("jni_method_id count = %d", loader_data->jmethod_ids()->count_methods()); |
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1851 } |
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1852 #endif // PRODUCT |
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1853 |
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1854 |
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1855 // Printing |
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1856 |
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1857 #ifndef PRODUCT |
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1858 |
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1859 void Method::print_on(outputStream* st) const { |
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1860 ResourceMark rm; |
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1861 assert(is_method(), "must be method"); |
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1862 st->print_cr(internal_name()); |
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1863 // get the effect of PrintOopAddress, always, for methods: |
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1864 st->print_cr(" - this oop: "INTPTR_FORMAT, (intptr_t)this); |
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1865 st->print (" - method holder: "); method_holder()->print_value_on(st); st->cr(); |
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1866 st->print (" - constants: "INTPTR_FORMAT" ", (address)constants()); |
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1867 constants()->print_value_on(st); st->cr(); |
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1868 st->print (" - access: 0x%x ", access_flags().as_int()); access_flags().print_on(st); st->cr(); |
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1869 st->print (" - name: "); name()->print_value_on(st); st->cr(); |
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1870 st->print (" - signature: "); signature()->print_value_on(st); st->cr(); |
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1871 st->print_cr(" - max stack: %d", max_stack()); |
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1872 st->print_cr(" - max locals: %d", max_locals()); |
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1873 st->print_cr(" - size of params: %d", size_of_parameters()); |
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1874 st->print_cr(" - method size: %d", method_size()); |
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1875 if (intrinsic_id() != vmIntrinsics::_none) |
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1876 st->print_cr(" - intrinsic id: %d %s", intrinsic_id(), vmIntrinsics::name_at(intrinsic_id())); |
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1877 if (highest_comp_level() != CompLevel_none) |
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1878 st->print_cr(" - highest level: %d", highest_comp_level()); |
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1879 st->print_cr(" - vtable index: %d", _vtable_index); |
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1880 st->print_cr(" - i2i entry: " INTPTR_FORMAT, interpreter_entry()); |
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1881 st->print( " - adapters: "); |
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1882 AdapterHandlerEntry* a = ((Method*)this)->adapter(); |
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1883 if (a == NULL) |
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1884 st->print_cr(INTPTR_FORMAT, a); |
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1885 else |
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1886 a->print_adapter_on(st); |
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1887 st->print_cr(" - compiled entry " INTPTR_FORMAT, from_compiled_entry()); |
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1888 st->print_cr(" - code size: %d", code_size()); |
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1889 if (code_size() != 0) { |
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1890 st->print_cr(" - code start: " INTPTR_FORMAT, code_base()); |
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1891 st->print_cr(" - code end (excl): " INTPTR_FORMAT, code_base() + code_size()); |
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1892 } |
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1893 if (method_data() != NULL) { |
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1894 st->print_cr(" - method data: " INTPTR_FORMAT, (address)method_data()); |
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1895 } |
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1896 st->print_cr(" - checked ex length: %d", checked_exceptions_length()); |
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1897 if (checked_exceptions_length() > 0) { |
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1898 CheckedExceptionElement* table = checked_exceptions_start(); |
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1899 st->print_cr(" - checked ex start: " INTPTR_FORMAT, table); |
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1900 if (Verbose) { |
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1901 for (int i = 0; i < checked_exceptions_length(); i++) { |
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1902 st->print_cr(" - throws %s", constants()->printable_name_at(table[i].class_cp_index)); |
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1903 } |
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1904 } |
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1905 } |
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1906 if (has_linenumber_table()) { |
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1907 u_char* table = compressed_linenumber_table(); |
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1908 st->print_cr(" - linenumber start: " INTPTR_FORMAT, table); |
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1909 if (Verbose) { |
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1910 CompressedLineNumberReadStream stream(table); |
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1911 while (stream.read_pair()) { |
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1912 st->print_cr(" - line %d: %d", stream.line(), stream.bci()); |
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1913 } |
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1914 } |
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1915 } |
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1916 st->print_cr(" - localvar length: %d", localvariable_table_length()); |
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1917 if (localvariable_table_length() > 0) { |
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1918 LocalVariableTableElement* table = localvariable_table_start(); |
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1919 st->print_cr(" - localvar start: " INTPTR_FORMAT, table); |
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1920 if (Verbose) { |
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1921 for (int i = 0; i < localvariable_table_length(); i++) { |
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1922 int bci = table[i].start_bci; |
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1923 int len = table[i].length; |
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1924 const char* name = constants()->printable_name_at(table[i].name_cp_index); |
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1925 const char* desc = constants()->printable_name_at(table[i].descriptor_cp_index); |
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1926 int slot = table[i].slot; |
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1927 st->print_cr(" - %s %s bci=%d len=%d slot=%d", desc, name, bci, len, slot); |
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1928 } |
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1929 } |
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1930 } |
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1931 if (code() != NULL) { |
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1932 st->print (" - compiled code: "); |
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1933 code()->print_value_on(st); |
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1934 } |
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1935 if (is_native()) { |
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1936 st->print_cr(" - native function: " INTPTR_FORMAT, native_function()); |
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1937 st->print_cr(" - signature handler: " INTPTR_FORMAT, signature_handler()); |
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1938 } |
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1939 } |
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1940 |
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1941 #endif //PRODUCT |
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1942 |
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1943 void Method::print_value_on(outputStream* st) const { |
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1944 assert(is_method(), "must be method"); |
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1945 st->print_cr(internal_name()); |
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1946 print_address_on(st); |
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1947 st->print(" "); |
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1948 name()->print_value_on(st); |
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1949 st->print(" "); |
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1950 signature()->print_value_on(st); |
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1951 st->print(" in "); |
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1952 method_holder()->print_value_on(st); |
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1953 if (WizardMode) st->print("[%d,%d]", size_of_parameters(), max_locals()); |
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1954 if (WizardMode && code() != NULL) st->print(" ((nmethod*)%p)", code()); |
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1955 } |
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1956 |
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1957 |
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1958 // Verification |
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1959 |
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1960 void Method::verify_on(outputStream* st) { |
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1961 guarantee(is_method(), "object must be method"); |
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1962 guarantee(is_metadata(), "should be metadata"); |
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1963 guarantee(constants()->is_constantPool(), "should be constant pool"); |
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1964 guarantee(constants()->is_metadata(), "should be metadata"); |
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1965 guarantee(constMethod()->is_constMethod(), "should be ConstMethod*"); |
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1966 guarantee(constMethod()->is_metadata(), "should be metadata"); |
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1967 MethodData* md = method_data(); |
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1968 guarantee(md == NULL || |
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1969 md->is_metadata(), "should be metadata"); |
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1970 guarantee(md == NULL || |
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1971 md->is_methodData(), "should be method data"); |
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1972 } |