1 /*
2 * Copyright (c) 1997, 2014, Oracle and/or its affiliates. All rights reserved.
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 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP
26 #define SHARE_VM_OOPS_METHODOOP_HPP
27
28 #include "classfile/vmSymbols.hpp"
29 #include "code/compressedStream.hpp"
30 #include "compiler/oopMap.hpp"
31 #include "interpreter/invocationCounter.hpp"
32 #include "oops/annotations.hpp"
33 #include "oops/constantPool.hpp"
34 #include "oops/methodCounters.hpp"
35 #include "oops/instanceKlass.hpp"
36 #include "oops/oop.hpp"
37 #include "oops/typeArrayOop.hpp"
38 #include "utilities/accessFlags.hpp"
39 #include "utilities/growableArray.hpp"
40
41 // A Method represents a Java method.
42 //
43 // Note that most applications load thousands of methods, so keeping the size of this
44 // class small has a big impact on footprint.
45 //
46 // Note that native_function and signature_handler have to be at fixed offsets
47 // (required by the interpreter)
48 //
49 // Method embedded field layout (after declared fields):
50 // [EMBEDDED native_function (present only if native) ]
51 // [EMBEDDED signature_handler (present only if native) ]
52
53 class CheckedExceptionElement;
54 class LocalVariableTableElement;
55 class AdapterHandlerEntry;
56 class MethodData;
57 class MethodCounters;
58 class ConstMethod;
59 class InlineTableSizes;
60 class KlassSizeStats;
61
62 class Method : public Metadata {
63 friend class VMStructs;
64 private:
65 ConstMethod* _constMethod; // Method read-only data.
66 MethodData* _method_data;
67 MethodCounters* _method_counters;
68 AccessFlags _access_flags; // Access flags
69 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
70 // note: can have vtables with >2**16 elements (because of inheritance)
71 #ifdef CC_INTERP
72 int _result_index; // C++ interpreter needs for converting results to/from stack
73 #endif
74 u2 _method_size; // size of this object
75 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
76
77 // Flags
78 enum Flags {
79 _jfr_towrite = 1 << 0,
80 _caller_sensitive = 1 << 1,
81 _force_inline = 1 << 2,
82 _dont_inline = 1 << 3,
83 _hidden = 1 << 4
84 };
85 u1 _flags;
86
87 #ifndef PRODUCT
88 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
89 #endif
90 // Entry point for calling both from and to the interpreter.
91 address _i2i_entry; // All-args-on-stack calling convention
92 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
93 AdapterHandlerEntry* _adapter;
94 // Entry point for calling from compiled code, to compiled code if it exists
95 // or else the interpreter.
96 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
97 // The entry point for calling both from and to compiled code is
98 // "_code->entry_point()". Because of tiered compilation and de-opt, this
99 // field can come and go. It can transition from NULL to not-null at any
100 // time (whenever a compile completes). It can transition from not-null to
101 // NULL only at safepoints (because of a de-opt).
102 nmethod* volatile _code; // Points to the corresponding piece of native code
103 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
104
105 // Constructor
106 Method(ConstMethod* xconst, AccessFlags access_flags, int size);
107 public:
108
109 static Method* allocate(ClassLoaderData* loader_data,
110 int byte_code_size,
111 AccessFlags access_flags,
112 InlineTableSizes* sizes,
113 ConstMethod::MethodType method_type,
114 TRAPS);
115
116 // CDS and vtbl checking can create an empty Method to get vtbl pointer.
117 Method(){}
118
119 // The Method vtable is restored by this call when the Method is in the
120 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for
121 // all the gory details. SA, dtrace and pstack helpers distinguish metadata
122 // by their vtable.
123 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
124 bool is_method() const volatile { return true; }
125
126 void restore_unshareable_info(TRAPS);
127
128 // accessors for instance variables
129
130 ConstMethod* constMethod() const { return _constMethod; }
131 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
132
133
134 static address make_adapters(methodHandle mh, TRAPS);
135 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
136 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
137
138 // access flag
139 AccessFlags access_flags() const { return _access_flags; }
140 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
141
142 // name
143 Symbol* name() const { return constants()->symbol_at(name_index()); }
144 int name_index() const { return constMethod()->name_index(); }
145 void set_name_index(int index) { constMethod()->set_name_index(index); }
146
147 // signature
148 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
149 int signature_index() const { return constMethod()->signature_index(); }
150 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
151
152 // generics support
153 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
154 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
155 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
156
157 // annotations support
158 AnnotationArray* annotations() const {
159 return constMethod()->method_annotations();
160 }
161 AnnotationArray* parameter_annotations() const {
162 return constMethod()->parameter_annotations();
163 }
164 AnnotationArray* annotation_default() const {
165 return constMethod()->default_annotations();
166 }
167 AnnotationArray* type_annotations() const {
168 return constMethod()->type_annotations();
169 }
170
171 #ifdef CC_INTERP
172 void set_result_index(BasicType type);
173 int result_index() { return _result_index; }
174 #endif
175
176 // Helper routine: get klass name + "." + method name + signature as
177 // C string, for the purpose of providing more useful NoSuchMethodErrors
178 // and fatal error handling. The string is allocated in resource
179 // area if a buffer is not provided by the caller.
180 char* name_and_sig_as_C_string() const;
181 char* name_and_sig_as_C_string(char* buf, int size) const;
182
183 // Static routine in the situations we don't have a Method*
184 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
185 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
186
187 Bytecodes::Code java_code_at(int bci) const {
188 return Bytecodes::java_code_at(this, bcp_from(bci));
189 }
190 Bytecodes::Code code_at(int bci) const {
191 return Bytecodes::code_at(this, bcp_from(bci));
192 }
193
194 // JVMTI breakpoints
195 Bytecodes::Code orig_bytecode_at(int bci) const;
196 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
197 void set_breakpoint(int bci);
198 void clear_breakpoint(int bci);
199 void clear_all_breakpoints();
200 // Tracking number of breakpoints, for fullspeed debugging.
201 // Only mutated by VM thread.
202 u2 number_of_breakpoints() const {
203 MethodCounters* mcs = method_counters();
204 if (mcs == NULL) {
205 return 0;
206 } else {
207 return mcs->number_of_breakpoints();
208 }
209 }
210 void incr_number_of_breakpoints(TRAPS) {
211 MethodCounters* mcs = get_method_counters(CHECK);
212 if (mcs != NULL) {
213 mcs->incr_number_of_breakpoints();
214 }
215 }
216 void decr_number_of_breakpoints(TRAPS) {
217 MethodCounters* mcs = get_method_counters(CHECK);
218 if (mcs != NULL) {
219 mcs->decr_number_of_breakpoints();
220 }
221 }
222 // Initialization only
223 void clear_number_of_breakpoints() {
224 MethodCounters* mcs = method_counters();
225 if (mcs != NULL) {
226 mcs->clear_number_of_breakpoints();
227 }
228 }
229
230 // index into InstanceKlass methods() array
231 // note: also used by jfr
232 u2 method_idnum() const { return constMethod()->method_idnum(); }
233 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
234
235 // code size
236 int code_size() const { return constMethod()->code_size(); }
237
238 // method size
239 int method_size() const { return _method_size; }
240 void set_method_size(int size) {
241 assert(0 <= size && size < (1 << 16), "invalid method size");
242 _method_size = size;
243 }
244
245 // constant pool for Klass* holding this method
246 ConstantPool* constants() const { return constMethod()->constants(); }
247 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
248
249 // max stack
250 // return original max stack size for method verification
251 int verifier_max_stack() const { return constMethod()->max_stack(); }
252 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
253 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
254
255 // max locals
256 int max_locals() const { return constMethod()->max_locals(); }
257 void set_max_locals(int size) { constMethod()->set_max_locals(size); }
258
259 int highest_comp_level() const;
260 void set_highest_comp_level(int level);
261 int highest_osr_comp_level() const;
262 void set_highest_osr_comp_level(int level);
263
264 // Count of times method was exited via exception while interpreting
265 void interpreter_throwout_increment(TRAPS) {
266 MethodCounters* mcs = get_method_counters(CHECK);
267 if (mcs != NULL) {
268 mcs->interpreter_throwout_increment();
269 }
270 }
271
272 int interpreter_throwout_count() const {
273 MethodCounters* mcs = method_counters();
274 if (mcs == NULL) {
275 return 0;
276 } else {
277 return mcs->interpreter_throwout_count();
278 }
279 }
280
281 // size of parameters
282 int size_of_parameters() const { return constMethod()->size_of_parameters(); }
283 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); }
284
285 bool has_stackmap_table() const {
286 return constMethod()->has_stackmap_table();
287 }
288
289 Array<u1>* stackmap_data() const {
290 return constMethod()->stackmap_data();
291 }
292
293 void set_stackmap_data(Array<u1>* sd) {
294 constMethod()->set_stackmap_data(sd);
295 }
296
297 // exception handler table
298 bool has_exception_handler() const
299 { return constMethod()->has_exception_handler(); }
300 int exception_table_length() const
301 { return constMethod()->exception_table_length(); }
302 ExceptionTableElement* exception_table_start() const
303 { return constMethod()->exception_table_start(); }
304
305 // Finds the first entry point bci of an exception handler for an
306 // exception of klass ex_klass thrown at throw_bci. A value of NULL
307 // for ex_klass indicates that the exception klass is not known; in
308 // this case it matches any constraint class. Returns -1 if the
309 // exception cannot be handled in this method. The handler
310 // constraint classes are loaded if necessary. Note that this may
311 // throw an exception if loading of the constraint classes causes
312 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
313 // If an exception is thrown, returns the bci of the
314 // exception handler which caused the exception to be thrown, which
315 // is needed for proper retries. See, for example,
316 // InterpreterRuntime::exception_handler_for_exception.
317 static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS);
318
319 // method data access
320 MethodData* method_data() const {
321 return _method_data;
322 }
323
324 void set_method_data(MethodData* data) {
325 // The store into method must be released. On platforms without
326 // total store order (TSO) the reference may become visible before
327 // the initialization of data otherwise.
328 OrderAccess::release_store_ptr((volatile void *)&_method_data, data);
329 }
330
331 MethodCounters* method_counters() const {
332 return _method_counters;
333 }
334
335 void set_method_counters(MethodCounters* counters) {
336 // The store into method must be released. On platforms without
337 // total store order (TSO) the reference may become visible before
338 // the initialization of data otherwise.
339 OrderAccess::release_store_ptr((volatile void *)&_method_counters, counters);
340 }
341
342 #ifdef TIERED
343 // We are reusing interpreter_invocation_count as a holder for the previous event count!
344 // We can do that since interpreter_invocation_count is not used in tiered.
345 int prev_event_count() const {
346 if (method_counters() == NULL) {
347 return 0;
348 } else {
349 return method_counters()->interpreter_invocation_count();
350 }
351 }
352 void set_prev_event_count(int count) {
353 MethodCounters* mcs = method_counters();
354 if (mcs != NULL) {
355 mcs->set_interpreter_invocation_count(count);
356 }
357 }
358 jlong prev_time() const {
359 MethodCounters* mcs = method_counters();
360 return mcs == NULL ? 0 : mcs->prev_time();
361 }
362 void set_prev_time(jlong time) {
363 MethodCounters* mcs = method_counters();
364 if (mcs != NULL) {
365 mcs->set_prev_time(time);
366 }
367 }
368 float rate() const {
369 MethodCounters* mcs = method_counters();
370 return mcs == NULL ? 0 : mcs->rate();
371 }
372 void set_rate(float rate) {
373 MethodCounters* mcs = method_counters();
374 if (mcs != NULL) {
375 mcs->set_rate(rate);
376 }
377 }
378 #endif
379
380 int invocation_count();
381 int backedge_count();
382
383 bool was_executed_more_than(int n);
384 bool was_never_executed() { return !was_executed_more_than(0); }
385
386 static void build_interpreter_method_data(methodHandle method, TRAPS);
387
388 static MethodCounters* build_method_counters(Method* m, TRAPS);
389
390 int interpreter_invocation_count() {
391 if (TieredCompilation) {
392 return invocation_count();
393 } else {
394 MethodCounters* mcs = method_counters();
395 return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
396 }
397 }
398 int increment_interpreter_invocation_count(TRAPS) {
399 if (TieredCompilation) ShouldNotReachHere();
400 MethodCounters* mcs = get_method_counters(CHECK_0);
401 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
402 }
403
404 #ifndef PRODUCT
405 int compiled_invocation_count() const { return _compiled_invocation_count; }
406 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
407 #else
408 // for PrintMethodData in a product build
409 int compiled_invocation_count() const { return 0; }
410 #endif // not PRODUCT
411
412 // Clear (non-shared space) pointers which could not be relevant
413 // if this (shared) method were mapped into another JVM.
414 void remove_unshareable_info();
415
416 // nmethod/verified compiler entry
417 address verified_code_entry();
418 bool check_code() const; // Not inline to avoid circular ref
419 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
420 void clear_code(); // Clear out any compiled code
421 static void set_code(methodHandle mh, nmethod* code);
422 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
423 address get_i2c_entry();
424 address get_c2i_entry();
425 address get_c2i_unverified_entry();
426 AdapterHandlerEntry* adapter() { return _adapter; }
427 // setup entry points
428 void link_method(methodHandle method, TRAPS);
429 // clear entry points. Used by sharing code
430 void unlink_method();
431
432 // vtable index
433 enum VtableIndexFlag {
434 // Valid vtable indexes are non-negative (>= 0).
435 // These few negative values are used as sentinels.
436 itable_index_max = -10, // first itable index, growing downward
437 pending_itable_index = -9, // itable index will be assigned
438 invalid_vtable_index = -4, // distinct from any valid vtable index
439 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
440 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
441 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
442 };
443 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
444 bool has_vtable_index() const { return _vtable_index >= 0; }
445 int vtable_index() const { return _vtable_index; }
446 void set_vtable_index(int index) { _vtable_index = index; }
447 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; })
448 bool has_itable_index() const { return _vtable_index <= itable_index_max; }
449 int itable_index() const { assert(valid_itable_index(), "");
450 return itable_index_max - _vtable_index; }
451 void set_itable_index(int index) { _vtable_index = itable_index_max - index; assert(valid_itable_index(), ""); }
452
453 // interpreter entry
454 address interpreter_entry() const { return _i2i_entry; }
455 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
456 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
457
458 // native function (used for native methods only)
459 enum {
460 native_bind_event_is_interesting = true
461 };
462 address native_function() const { return *(native_function_addr()); }
463 address critical_native_function();
464
465 // Must specify a real function (not NULL).
466 // Use clear_native_function() to unregister.
467 void set_native_function(address function, bool post_event_flag);
468 bool has_native_function() const;
469 void clear_native_function();
470
471 // signature handler (used for native methods only)
472 address signature_handler() const { return *(signature_handler_addr()); }
473 void set_signature_handler(address handler);
474
475 // Interpreter oopmap support
476 void mask_for(int bci, InterpreterOopMap* mask);
477
478 // operations on invocation counter
479 void print_invocation_count();
480
481 // byte codes
482 void set_code(address code) { return constMethod()->set_code(code); }
483 address code_base() const { return constMethod()->code_base(); }
484 bool contains(address bcp) const { return constMethod()->contains(bcp); }
485
486 // prints byte codes
487 void print_codes() const { print_codes_on(tty); }
488 void print_codes_on(outputStream* st) const;
489 void print_codes_on(int from, int to, outputStream* st) const;
490
491 // method parameters
492 bool has_method_parameters() const
493 { return constMethod()->has_method_parameters(); }
494 int method_parameters_length() const
495 { return constMethod()->method_parameters_length(); }
496 MethodParametersElement* method_parameters_start() const
497 { return constMethod()->method_parameters_start(); }
498
499 // checked exceptions
500 int checked_exceptions_length() const
501 { return constMethod()->checked_exceptions_length(); }
502 CheckedExceptionElement* checked_exceptions_start() const
503 { return constMethod()->checked_exceptions_start(); }
504
505 // localvariable table
506 bool has_localvariable_table() const
507 { return constMethod()->has_localvariable_table(); }
508 int localvariable_table_length() const
509 { return constMethod()->localvariable_table_length(); }
510 LocalVariableTableElement* localvariable_table_start() const
511 { return constMethod()->localvariable_table_start(); }
512
513 bool has_linenumber_table() const
514 { return constMethod()->has_linenumber_table(); }
515 u_char* compressed_linenumber_table() const
516 { return constMethod()->compressed_linenumber_table(); }
517
518 // method holder (the Klass* holding this method)
519 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
520
521 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
522 Symbol* klass_name() const; // returns the name of the method holder
523 BasicType result_type() const; // type of the method result
524 int result_type_index() const; // type index of the method result
525 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
526 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
527
528 // Checked exceptions thrown by this method (resolved to mirrors)
529 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
530
531 // Access flags
532 bool is_public() const { return access_flags().is_public(); }
533 bool is_private() const { return access_flags().is_private(); }
534 bool is_protected() const { return access_flags().is_protected(); }
535 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
536 bool is_static() const { return access_flags().is_static(); }
537 bool is_final() const { return access_flags().is_final(); }
538 bool is_synchronized() const { return access_flags().is_synchronized();}
539 bool is_native() const { return access_flags().is_native(); }
540 bool is_abstract() const { return access_flags().is_abstract(); }
541 bool is_strict() const { return access_flags().is_strict(); }
542 bool is_synthetic() const { return access_flags().is_synthetic(); }
543
544 // returns true if contains only return operation
545 bool is_empty_method() const;
546
547 // returns true if this is a vanilla constructor
548 bool is_vanilla_constructor() const;
549
550 // checks method and its method holder
551 bool is_final_method() const;
552 bool is_final_method(AccessFlags class_access_flags) const;
553 bool is_default_method() const;
554
555 // true if method needs no dynamic dispatch (final and/or no vtable entry)
556 bool can_be_statically_bound() const;
557 bool can_be_statically_bound(AccessFlags class_access_flags) const;
558
559 // returns true if the method has any backward branches.
560 bool has_loops() {
561 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
562 };
563
564 bool compute_has_loops_flag();
565
566 bool has_jsrs() {
567 return access_flags().has_jsrs();
568 };
569 void set_has_jsrs() {
570 _access_flags.set_has_jsrs();
571 }
572
573 // returns true if the method has any monitors.
574 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
575 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
576
577 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
578
579 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
580 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
581 // has not been computed yet.
582 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
583 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
584
585 // returns true if the method is an accessor function (setter/getter).
586 bool is_accessor() const;
587
588 // returns true if the method is an initializer (<init> or <clinit>).
589 bool is_initializer() const;
590
591 // returns true if the method is static OR if the classfile version < 51
592 bool has_valid_initializer_flags() const;
593
594 // returns true if the method name is <clinit> and the method has
595 // valid static initializer flags.
596 bool is_static_initializer() const;
597
598 // compiled code support
599 // NOTE: code() is inherently racy as deopt can be clearing code
600 // simultaneously. Use with caution.
601 bool has_compiled_code() const { return code() != NULL; }
602
603 // sizing
604 static int header_size() { return sizeof(Method)/HeapWordSize; }
605 static int size(bool is_native);
606 int size() const { return method_size(); }
607 #if INCLUDE_SERVICES
608 void collect_statistics(KlassSizeStats *sz) const;
609 #endif
610
611 // interpreter support
612 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
613 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
614 #ifdef CC_INTERP
615 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); }
616 #endif /* CC_INTERP */
617 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
618 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
619 static ByteSize method_data_offset() {
620 return byte_offset_of(Method, _method_data);
621 }
622 static ByteSize method_counters_offset() {
623 return byte_offset_of(Method, _method_counters);
624 }
625 #ifndef PRODUCT
626 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
627 #endif // not PRODUCT
628 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
629 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
630 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
631 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
632
633 // for code generation
634 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
635 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
636 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
637
638 // Static methods that are used to implement member methods where an exposed this pointer
639 // is needed due to possible GCs
640 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
641
642 // Returns the byte code index from the byte code pointer
643 int bci_from(address bcp) const;
644 address bcp_from(int bci) const;
645 int validate_bci_from_bcx(intptr_t bcx) const;
646
647 // Returns the line number for a bci if debugging information for the method is prowided,
648 // -1 is returned otherwise.
649 int line_number_from_bci(int bci) const;
650
651 // Reflection support
652 bool is_overridden_in(Klass* k) const;
653
654 // Stack walking support
655 bool is_ignored_by_security_stack_walk() const;
656
657 // JSR 292 support
658 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
659 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
660 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
661 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
662 Symbol* signature, //anything at all
663 TRAPS);
664 static Klass* check_non_bcp_klass(Klass* klass);
665
666 // How many extra stack entries for invokedynamic when it's enabled
667 static const int extra_stack_entries_for_jsr292 = 1;
668
669 // this operates only on invoke methods:
670 // presize interpreter frames for extra interpreter stack entries, if needed
671 // Account for the extra appendix argument for invokehandle/invokedynamic
672 static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
673 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize
674
675 // RedefineClasses() support:
676 bool is_old() const { return access_flags().is_old(); }
677 void set_is_old() { _access_flags.set_is_old(); }
678 bool is_obsolete() const { return access_flags().is_obsolete(); }
679 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
680 bool on_stack() const { return access_flags().on_stack(); }
681 void set_on_stack(const bool value);
682
683 // see the definition in Method*.cpp for the gory details
684 bool should_not_be_cached() const;
685
686 // JVMTI Native method prefixing support:
687 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
688 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
689
690 // Rewriting support
691 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
692 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
693
694 // jmethodID handling
695 // Because the useful life-span of a jmethodID cannot be determined,
696 // once created they are never reclaimed. The methods to which they refer,
697 // however, can be GC'ed away if the class is unloaded or if the method is
698 // made obsolete or deleted -- in these cases, the jmethodID
699 // refers to NULL (as is the case for any weak reference).
700 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
701 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
702
703 // Use resolve_jmethod_id() in situations where the caller is expected
704 // to provide a valid jmethodID; the only sanity checks are in asserts;
705 // result guaranteed not to be NULL.
706 inline static Method* resolve_jmethod_id(jmethodID mid) {
707 assert(mid != NULL, "JNI method id should not be null");
708 return *((Method**)mid);
709 }
710
711 // Use checked_resolve_jmethod_id() in situations where the caller
712 // should provide a valid jmethodID, but might not. NULL is returned
713 // when the jmethodID does not refer to a valid method.
714 static Method* checked_resolve_jmethod_id(jmethodID mid);
715
716 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
717 static bool is_method_id(jmethodID mid);
718
719 // Clear methods
720 static void clear_jmethod_ids(ClassLoaderData* loader_data);
721 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
722
723 // Get this method's jmethodID -- allocate if it doesn't exist
724 jmethodID jmethod_id() { methodHandle this_h(this);
725 return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
726
727 // Lookup the jmethodID for this method. Return NULL if not found.
728 // NOTE that this function can be called from a signal handler
729 // (see AsyncGetCallTrace support for Forte Analyzer) and this
730 // needs to be async-safe. No allocation should be done and
731 // so handles are not used to avoid deadlock.
732 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
733
734 // Support for inlining of intrinsic methods
735 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
736 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
737
738 // Helper routines for intrinsic_id() and vmIntrinsics::method().
739 void init_intrinsic_id(); // updates from _none if a match
740 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder);
741
742 bool jfr_towrite() {
743 return (_flags & _jfr_towrite) != 0;
744 }
745 void set_jfr_towrite(bool x) {
746 _flags = x ? (_flags | _jfr_towrite) : (_flags & ~_jfr_towrite);
747 }
748
749 bool caller_sensitive() {
750 return (_flags & _caller_sensitive) != 0;
751 }
752 void set_caller_sensitive(bool x) {
753 _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
754 }
755
756 bool force_inline() {
757 return (_flags & _force_inline) != 0;
758 }
759 void set_force_inline(bool x) {
760 _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
761 }
762
763 bool dont_inline() {
764 return (_flags & _dont_inline) != 0;
765 }
766 void set_dont_inline(bool x) {
767 _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
768 }
769
770 bool is_hidden() {
771 return (_flags & _hidden) != 0;
772 }
773 void set_hidden(bool x) {
774 _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
775 }
776
777 ConstMethod::MethodType method_type() const {
778 return _constMethod->method_type();
779 }
780 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
781
782 // On-stack replacement support
783 bool has_osr_nmethod(int level, bool match_level) {
784 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
785 }
786
787 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
788 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
789 }
790
791 // Inline cache support
792 void cleanup_inline_caches();
793
794 // Find if klass for method is loaded
795 bool is_klass_loaded_by_klass_index(int klass_index) const;
796 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
797
798 // Indicates whether compilation failed earlier for this method, or
799 // whether it is not compilable for another reason like having a
800 // breakpoint set in it.
801 bool is_not_compilable(int comp_level = CompLevel_any) const;
802 void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
803 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
804 set_not_compilable(comp_level, false);
805 }
806 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
807 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
808 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
809 set_not_osr_compilable(comp_level, false);
810 }
811 bool is_always_compilable() const;
812
813 private:
814 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
815
816 public:
817 MethodCounters* get_method_counters(TRAPS) {
818 if (_method_counters == NULL) {
819 build_method_counters(this, CHECK_AND_CLEAR_NULL);
820 }
821 return _method_counters;
822 }
823
824 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
825 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
826 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); }
827 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
828 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
829 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); }
830
831 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit
832 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit
833 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit
834 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); }
835 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); }
836 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); }
837
838 // Background compilation support
839 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
840 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
841 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
842
843 // Resolve all classes in signature, return 'true' if successful
844 static bool load_signature_classes(methodHandle m, TRAPS);
845
846 // Return if true if not all classes references in signature, including return type, has been loaded
847 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
848
849 // Printing
850 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
851 #if INCLUDE_JVMTI
852 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
853 #else
854 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)"
855 #endif
856
857 // Helper routine used for method sorting
858 static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
859
860 // Deallocation function for redefine classes or if an error occurs
861 void deallocate_contents(ClassLoaderData* loader_data);
862
863 // Printing
864 #ifndef PRODUCT
865 void print_on(outputStream* st) const;
866 #endif
867 void print_value_on(outputStream* st) const;
868
869 const char* internal_name() const { return "{method}"; }
870
871 // Check for valid method pointer
872 bool is_valid_method() const;
873
874 // Verify
875 void verify() { verify_on(tty); }
876 void verify_on(outputStream* st);
877
878 private:
879
880 // Inlined elements
881 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
882 address* signature_handler_addr() const { return native_function_addr() + 1; }
883 };
884
885
886 // Utility class for compressing line number tables
887
888 class CompressedLineNumberWriteStream: public CompressedWriteStream {
889 private:
890 int _bci;
891 int _line;
892 public:
893 // Constructor
894 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
895 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
896
897 // Write (bci, line number) pair to stream
898 void write_pair_regular(int bci_delta, int line_delta);
899
900 inline void write_pair_inline(int bci, int line) {
901 int bci_delta = bci - _bci;
902 int line_delta = line - _line;
903 _bci = bci;
904 _line = line;
905 // Skip (0,0) deltas - they do not add information and conflict with terminator.
906 if (bci_delta == 0 && line_delta == 0) return;
907 // Check if bci is 5-bit and line number 3-bit unsigned.
908 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
909 // Compress into single byte.
910 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
911 // Check that value doesn't match escape character.
912 if (value != 0xFF) {
913 write_byte(value);
914 return;
915 }
916 }
917 write_pair_regular(bci_delta, line_delta);
918 }
919
920 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
921 // Disabling optimization doesn't work for methods in header files
922 // so we force it to call through the non-optimized version in the .cpp.
923 // It's gross, but it's the only way we can ensure that all callers are
924 // fixed. _MSC_VER is defined by the windows compiler
925 #if defined(_M_AMD64) && _MSC_VER >= 1400
926 void write_pair(int bci, int line);
927 #else
928 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
929 #endif
930
931 // Write end-of-stream marker
932 void write_terminator() { write_byte(0); }
933 };
934
935
936 // Utility class for decompressing line number tables
937
938 class CompressedLineNumberReadStream: public CompressedReadStream {
939 private:
940 int _bci;
941 int _line;
942 public:
943 // Constructor
944 CompressedLineNumberReadStream(u_char* buffer);
945 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
946 bool read_pair();
947 // Accessing bci and line number (after calling read_pair)
948 int bci() const { return _bci; }
949 int line() const { return _line; }
950 };
951
952
953 /// Fast Breakpoints.
954
955 // If this structure gets more complicated (because bpts get numerous),
956 // move it into its own header.
957
958 // There is presently no provision for concurrent access
959 // to breakpoint lists, which is only OK for JVMTI because
960 // breakpoints are written only at safepoints, and are read
961 // concurrently only outside of safepoints.
962
963 class BreakpointInfo : public CHeapObj<mtClass> {
964 friend class VMStructs;
965 private:
966 Bytecodes::Code _orig_bytecode;
967 int _bci;
968 u2 _name_index; // of method
969 u2 _signature_index; // of method
970 BreakpointInfo* _next; // simple storage allocation
971
972 public:
973 BreakpointInfo(Method* m, int bci);
974
975 // accessors
976 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
977 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
978 int bci() { return _bci; }
979
980 BreakpointInfo* next() const { return _next; }
981 void set_next(BreakpointInfo* n) { _next = n; }
982
983 // helps for searchers
984 bool match(const Method* m, int bci) {
985 return bci == _bci && match(m);
986 }
987
988 bool match(const Method* m) {
989 return _name_index == m->name_index() &&
990 _signature_index == m->signature_index();
991 }
992
993 void set(Method* method);
994 void clear(Method* method);
995 };
996
997 // Utility class for access exception handlers
998 class ExceptionTable : public StackObj {
999 private:
1000 ExceptionTableElement* _table;
1001 u2 _length;
1002
1003 public:
1004 ExceptionTable(const Method* m) {
1005 if (m->has_exception_handler()) {
1006 _table = m->exception_table_start();
1007 _length = m->exception_table_length();
1008 } else {
1009 _table = NULL;
1010 _length = 0;
1011 }
1012 }
1013
1014 int length() const {
1015 return _length;
1016 }
1017
1018 u2 start_pc(int idx) const {
1019 assert(idx < _length, "out of bounds");
1020 return _table[idx].start_pc;
1021 }
1022
1023 void set_start_pc(int idx, u2 value) {
1024 assert(idx < _length, "out of bounds");
1025 _table[idx].start_pc = value;
1026 }
1027
1028 u2 end_pc(int idx) const {
1029 assert(idx < _length, "out of bounds");
1030 return _table[idx].end_pc;
1031 }
1032
1033 void set_end_pc(int idx, u2 value) {
1034 assert(idx < _length, "out of bounds");
1035 _table[idx].end_pc = value;
1036 }
1037
1038 u2 handler_pc(int idx) const {
1039 assert(idx < _length, "out of bounds");
1040 return _table[idx].handler_pc;
1041 }
1042
1043 void set_handler_pc(int idx, u2 value) {
1044 assert(idx < _length, "out of bounds");
1045 _table[idx].handler_pc = value;
1046 }
1047
1048 u2 catch_type_index(int idx) const {
1049 assert(idx < _length, "out of bounds");
1050 return _table[idx].catch_type_index;
1051 }
1052
1053 void set_catch_type_index(int idx, u2 value) {
1054 assert(idx < _length, "out of bounds");
1055 _table[idx].catch_type_index = value;
1056 }
1057 };
1058
1059 #endif // SHARE_VM_OOPS_METHODOOP_HPP