1 /*
2 * Copyright (c) 1997, 2016, 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 class CompiledMethod;
62
63 class Method : public Metadata {
64 friend class VMStructs;
65 friend class JVMCIVMStructs;
66 private:
67 ConstMethod* _constMethod; // Method read-only data.
68 MethodData* _method_data;
69 MethodCounters* _method_counters;
70 AccessFlags _access_flags; // Access flags
71 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
72 // note: can have vtables with >2**16 elements (because of inheritance)
73 u2 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
74
75 // Flags
76 enum Flags {
77 _jfr_towrite = 1 << 0,
78 _caller_sensitive = 1 << 1,
79 _force_inline = 1 << 2,
80 _dont_inline = 1 << 3,
81 _hidden = 1 << 4,
82 _has_injected_profile = 1 << 5,
83 _running_emcp = 1 << 6,
84 _intrinsic_candidate = 1 << 7,
85 _reserved_stack_access = 1 << 8
86 };
87 mutable u2 _flags;
88
89 #ifndef PRODUCT
90 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
91 #endif
92 // Entry point for calling both from and to the interpreter.
93 address _i2i_entry; // All-args-on-stack calling convention
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 CompiledMethod* 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);
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_compiled_entry_no_trampoline() const;
137 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
138
139 // access flag
140 AccessFlags access_flags() const { return _access_flags; }
141 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
142
143 // name
144 Symbol* name() const { return constants()->symbol_at(name_index()); }
145 int name_index() const { return constMethod()->name_index(); }
146 void set_name_index(int index) { constMethod()->set_name_index(index); }
147
148 // signature
149 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
150 int signature_index() const { return constMethod()->signature_index(); }
151 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
152
153 // generics support
154 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
155 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
156 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
157
158 // annotations support
159 AnnotationArray* annotations() const {
160 return constMethod()->method_annotations();
161 }
162 AnnotationArray* parameter_annotations() const {
163 return constMethod()->parameter_annotations();
164 }
165 AnnotationArray* annotation_default() const {
166 return constMethod()->default_annotations();
167 }
168 AnnotationArray* type_annotations() const {
169 return constMethod()->type_annotations();
170 }
171
172 // Helper routine: get klass name + "." + method name + signature as
173 // C string, for the purpose of providing more useful NoSuchMethodErrors
174 // and fatal error handling. The string is allocated in resource
175 // area if a buffer is not provided by the caller.
176 char* name_and_sig_as_C_string() const;
177 char* name_and_sig_as_C_string(char* buf, int size) const;
178
179 // Static routine in the situations we don't have a Method*
180 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
181 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
182
183 Bytecodes::Code java_code_at(int bci) const {
184 return Bytecodes::java_code_at(this, bcp_from(bci));
185 }
186 Bytecodes::Code code_at(int bci) const {
187 return Bytecodes::code_at(this, bcp_from(bci));
188 }
189
190 // JVMTI breakpoints
191 #if !INCLUDE_JVMTI
192 Bytecodes::Code orig_bytecode_at(int bci) const {
193 ShouldNotReachHere();
194 return Bytecodes::_shouldnotreachhere;
195 }
196 void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
197 ShouldNotReachHere();
198 };
199 u2 number_of_breakpoints() const {return 0;}
200 #else // !INCLUDE_JVMTI
201 Bytecodes::Code orig_bytecode_at(int bci) const;
202 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
203 void set_breakpoint(int bci);
204 void clear_breakpoint(int bci);
205 void clear_all_breakpoints();
206 // Tracking number of breakpoints, for fullspeed debugging.
207 // Only mutated by VM thread.
208 u2 number_of_breakpoints() const {
209 MethodCounters* mcs = method_counters();
210 if (mcs == NULL) {
211 return 0;
212 } else {
213 return mcs->number_of_breakpoints();
214 }
215 }
216 void incr_number_of_breakpoints(TRAPS) {
217 MethodCounters* mcs = get_method_counters(CHECK);
218 if (mcs != NULL) {
219 mcs->incr_number_of_breakpoints();
220 }
221 }
222 void decr_number_of_breakpoints(TRAPS) {
223 MethodCounters* mcs = get_method_counters(CHECK);
224 if (mcs != NULL) {
225 mcs->decr_number_of_breakpoints();
226 }
227 }
228 // Initialization only
229 void clear_number_of_breakpoints() {
230 MethodCounters* mcs = method_counters();
231 if (mcs != NULL) {
232 mcs->clear_number_of_breakpoints();
233 }
234 }
235 #endif // !INCLUDE_JVMTI
236
237 // index into InstanceKlass methods() array
238 // note: also used by jfr
239 u2 method_idnum() const { return constMethod()->method_idnum(); }
240 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
241
242 u2 orig_method_idnum() const { return constMethod()->orig_method_idnum(); }
243 void set_orig_method_idnum(u2 idnum) { constMethod()->set_orig_method_idnum(idnum); }
244
245 // code size
246 int code_size() const { return constMethod()->code_size(); }
247
248 // method size in words
249 int method_size() const { return sizeof(Method)/wordSize + is_native() ? 2 : 0; }
250
251 // constant pool for Klass* holding this method
252 ConstantPool* constants() const { return constMethod()->constants(); }
253 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
254
255 // max stack
256 // return original max stack size for method verification
257 int verifier_max_stack() const { return constMethod()->max_stack(); }
258 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
259 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
260
261 // max locals
262 int max_locals() const { return constMethod()->max_locals(); }
263 void set_max_locals(int size) { constMethod()->set_max_locals(size); }
264
265 int highest_comp_level() const;
266 void set_highest_comp_level(int level);
267 int highest_osr_comp_level() const;
268 void set_highest_osr_comp_level(int level);
269
270 #if defined(COMPILER2) || INCLUDE_JVMCI
271 // Count of times method was exited via exception while interpreting
272 void interpreter_throwout_increment(TRAPS) {
273 MethodCounters* mcs = get_method_counters(CHECK);
274 if (mcs != NULL) {
275 mcs->interpreter_throwout_increment();
276 }
277 }
278 #endif
279
280 int interpreter_throwout_count() const {
281 MethodCounters* mcs = method_counters();
282 if (mcs == NULL) {
283 return 0;
284 } else {
285 return mcs->interpreter_throwout_count();
286 }
287 }
288
289 // size of parameters
290 int size_of_parameters() const { return constMethod()->size_of_parameters(); }
291 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); }
292
293 bool has_stackmap_table() const {
294 return constMethod()->has_stackmap_table();
295 }
296
297 Array<u1>* stackmap_data() const {
298 return constMethod()->stackmap_data();
299 }
300
301 void set_stackmap_data(Array<u1>* sd) {
302 constMethod()->set_stackmap_data(sd);
303 }
304
305 // exception handler table
306 bool has_exception_handler() const
307 { return constMethod()->has_exception_handler(); }
308 int exception_table_length() const
309 { return constMethod()->exception_table_length(); }
310 ExceptionTableElement* exception_table_start() const
311 { return constMethod()->exception_table_start(); }
312
313 // Finds the first entry point bci of an exception handler for an
314 // exception of klass ex_klass thrown at throw_bci. A value of NULL
315 // for ex_klass indicates that the exception klass is not known; in
316 // this case it matches any constraint class. Returns -1 if the
317 // exception cannot be handled in this method. The handler
318 // constraint classes are loaded if necessary. Note that this may
319 // throw an exception if loading of the constraint classes causes
320 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
321 // If an exception is thrown, returns the bci of the
322 // exception handler which caused the exception to be thrown, which
323 // is needed for proper retries. See, for example,
324 // InterpreterRuntime::exception_handler_for_exception.
325 static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS);
326
327 // method data access
328 MethodData* method_data() const {
329 return _method_data;
330 }
331
332 void set_method_data(MethodData* data) {
333 // The store into method must be released. On platforms without
334 // total store order (TSO) the reference may become visible before
335 // the initialization of data otherwise.
336 OrderAccess::release_store_ptr((volatile void *)&_method_data, data);
337 }
338
339 MethodCounters* method_counters() const {
340 return _method_counters;
341 }
342
343 void clear_method_counters() {
344 _method_counters = NULL;
345 }
346
347 bool init_method_counters(MethodCounters* counters) {
348 // Try to install a pointer to MethodCounters, return true on success.
349 return Atomic::cmpxchg_ptr(counters, (volatile void*)&_method_counters, NULL) == NULL;
350 }
351
352 #ifdef TIERED
353 // We are reusing interpreter_invocation_count as a holder for the previous event count!
354 // We can do that since interpreter_invocation_count is not used in tiered.
355 int prev_event_count() const {
356 if (method_counters() == NULL) {
357 return 0;
358 } else {
359 return method_counters()->interpreter_invocation_count();
360 }
361 }
362 void set_prev_event_count(int count) {
363 MethodCounters* mcs = method_counters();
364 if (mcs != NULL) {
365 mcs->set_interpreter_invocation_count(count);
366 }
367 }
368 jlong prev_time() const {
369 MethodCounters* mcs = method_counters();
370 return mcs == NULL ? 0 : mcs->prev_time();
371 }
372 void set_prev_time(jlong time) {
373 MethodCounters* mcs = method_counters();
374 if (mcs != NULL) {
375 mcs->set_prev_time(time);
376 }
377 }
378 float rate() const {
379 MethodCounters* mcs = method_counters();
380 return mcs == NULL ? 0 : mcs->rate();
381 }
382 void set_rate(float rate) {
383 MethodCounters* mcs = method_counters();
384 if (mcs != NULL) {
385 mcs->set_rate(rate);
386 }
387 }
388 #endif
389 int nmethod_age() const {
390 if (method_counters() == NULL) {
391 return INT_MAX;
392 } else {
393 return method_counters()->nmethod_age();
394 }
395 }
396
397 int invocation_count();
398 int backedge_count();
399
400 bool was_executed_more_than(int n);
401 bool was_never_executed() { return !was_executed_more_than(0); }
402
403 static void build_interpreter_method_data(const methodHandle& method, TRAPS);
404
405 static MethodCounters* build_method_counters(Method* m, TRAPS);
406
407 int interpreter_invocation_count() {
408 if (TieredCompilation) {
409 return invocation_count();
410 } else {
411 MethodCounters* mcs = method_counters();
412 return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
413 }
414 }
415 #if defined(COMPILER2) || INCLUDE_JVMCI
416 int increment_interpreter_invocation_count(TRAPS) {
417 if (TieredCompilation) ShouldNotReachHere();
418 MethodCounters* mcs = get_method_counters(CHECK_0);
419 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
420 }
421 #endif
422
423 #ifndef PRODUCT
424 int compiled_invocation_count() const { return _compiled_invocation_count; }
425 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
426 #else
427 // for PrintMethodData in a product build
428 int compiled_invocation_count() const { return 0; }
429 #endif // not PRODUCT
430
431 // Clear (non-shared space) pointers which could not be relevant
432 // if this (shared) method were mapped into another JVM.
433 void remove_unshareable_info();
434
435 // nmethod/verified compiler entry
436 address verified_code_entry();
437 bool check_code() const; // Not inline to avoid circular ref
438 CompiledMethod* volatile code() const { assert( check_code(), "" ); return (CompiledMethod *)OrderAccess::load_ptr_acquire(&_code); }
439 void clear_code(); // Clear out any compiled code
440 static void set_code(methodHandle mh, CompiledMethod* code);
441 void set_adapter_entry(AdapterHandlerEntry* adapter) {
442 constMethod()->set_adapter_entry(adapter);
443 }
444 void update_adapter_trampoline(AdapterHandlerEntry* adapter) {
445 constMethod()->update_adapter_trampoline(adapter);
446 }
447
448 address get_i2c_entry();
449 address get_c2i_entry();
450 address get_c2i_unverified_entry();
451 AdapterHandlerEntry* adapter() const {
452 return constMethod()->adapter();
453 }
454 // setup entry points
455 void link_method(const methodHandle& method, TRAPS);
456 // clear entry points. Used by sharing code during dump time
457 void unlink_method() NOT_CDS_RETURN;
458
459 // vtable index
460 enum VtableIndexFlag {
461 // Valid vtable indexes are non-negative (>= 0).
462 // These few negative values are used as sentinels.
463 itable_index_max = -10, // first itable index, growing downward
464 pending_itable_index = -9, // itable index will be assigned
465 invalid_vtable_index = -4, // distinct from any valid vtable index
466 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
467 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
468 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
469 };
470 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
471 bool has_vtable_index() const { return _vtable_index >= 0; }
472 int vtable_index() const { return _vtable_index; }
473 void set_vtable_index(int index) { _vtable_index = index; }
474 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; })
475 bool has_itable_index() const { return _vtable_index <= itable_index_max; }
476 int itable_index() const { assert(valid_itable_index(), "");
477 return itable_index_max - _vtable_index; }
478 void set_itable_index(int index) { _vtable_index = itable_index_max - index; assert(valid_itable_index(), ""); }
479
480 // interpreter entry
481 address interpreter_entry() const { return _i2i_entry; }
482 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
483 void set_interpreter_entry(address entry) {
484 assert(!is_shared(), "shared method's interpreter entry should not be changed at run time");
485 if (_i2i_entry != entry) {
486 _i2i_entry = entry;
487 }
488 if (_from_interpreted_entry != entry) {
489 _from_interpreted_entry = entry;
490 }
491 }
492
493 // native function (used for native methods only)
494 enum {
495 native_bind_event_is_interesting = true
496 };
497 address native_function() const { return *(native_function_addr()); }
498 address critical_native_function();
499
500 // Must specify a real function (not NULL).
501 // Use clear_native_function() to unregister.
502 void set_native_function(address function, bool post_event_flag);
503 bool has_native_function() const;
504 void clear_native_function();
505
506 // signature handler (used for native methods only)
507 address signature_handler() const { return *(signature_handler_addr()); }
508 void set_signature_handler(address handler);
509
510 // Interpreter oopmap support
511 void mask_for(int bci, InterpreterOopMap* mask);
512
513 // operations on invocation counter
514 void print_invocation_count();
515
516 // byte codes
517 void set_code(address code) { return constMethod()->set_code(code); }
518 address code_base() const { return constMethod()->code_base(); }
519 bool contains(address bcp) const { return constMethod()->contains(bcp); }
520
521 // prints byte codes
522 void print_codes() const { print_codes_on(tty); }
523 void print_codes_on(outputStream* st) const;
524 void print_codes_on(int from, int to, outputStream* st) const;
525
526 // method parameters
527 bool has_method_parameters() const
528 { return constMethod()->has_method_parameters(); }
529 int method_parameters_length() const
530 { return constMethod()->method_parameters_length(); }
531 MethodParametersElement* method_parameters_start() const
532 { return constMethod()->method_parameters_start(); }
533
534 // checked exceptions
535 int checked_exceptions_length() const
536 { return constMethod()->checked_exceptions_length(); }
537 CheckedExceptionElement* checked_exceptions_start() const
538 { return constMethod()->checked_exceptions_start(); }
539
540 // localvariable table
541 bool has_localvariable_table() const
542 { return constMethod()->has_localvariable_table(); }
543 int localvariable_table_length() const
544 { return constMethod()->localvariable_table_length(); }
545 LocalVariableTableElement* localvariable_table_start() const
546 { return constMethod()->localvariable_table_start(); }
547
548 bool has_linenumber_table() const
549 { return constMethod()->has_linenumber_table(); }
550 u_char* compressed_linenumber_table() const
551 { return constMethod()->compressed_linenumber_table(); }
552
553 // method holder (the Klass* holding this method)
554 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
555
556 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
557 Symbol* klass_name() const; // returns the name of the method holder
558 BasicType result_type() const; // type of the method result
559 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
560 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
561
562 // Checked exceptions thrown by this method (resolved to mirrors)
563 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
564
565 // Access flags
566 bool is_public() const { return access_flags().is_public(); }
567 bool is_private() const { return access_flags().is_private(); }
568 bool is_protected() const { return access_flags().is_protected(); }
569 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
570 bool is_static() const { return access_flags().is_static(); }
571 bool is_final() const { return access_flags().is_final(); }
572 bool is_synchronized() const { return access_flags().is_synchronized();}
573 bool is_native() const { return access_flags().is_native(); }
574 bool is_abstract() const { return access_flags().is_abstract(); }
575 bool is_strict() const { return access_flags().is_strict(); }
576 bool is_synthetic() const { return access_flags().is_synthetic(); }
577
578 // returns true if contains only return operation
579 bool is_empty_method() const;
580
581 // returns true if this is a vanilla constructor
582 bool is_vanilla_constructor() const;
583
584 // checks method and its method holder
585 bool is_final_method() const;
586 bool is_final_method(AccessFlags class_access_flags) const;
587 bool is_default_method() const;
588
589 // true if method needs no dynamic dispatch (final and/or no vtable entry)
590 bool can_be_statically_bound() const;
591 bool can_be_statically_bound(AccessFlags class_access_flags) const;
592
593 // returns true if the method has any backward branches.
594 bool has_loops() {
595 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
596 };
597
598 bool compute_has_loops_flag();
599
600 bool has_jsrs() {
601 return access_flags().has_jsrs();
602 };
603 void set_has_jsrs() {
604 _access_flags.set_has_jsrs();
605 }
606
607 // returns true if the method has any monitors.
608 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
609 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
610
611 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
612
613 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
614 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
615 // has not been computed yet.
616 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
617 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
618
619 // returns true if the method is an accessor function (setter/getter).
620 bool is_accessor() const;
621
622 // returns true if the method is a getter
623 bool is_getter() const;
624
625 // returns true if the method is a setter
626 bool is_setter() const;
627
628 // returns true if the method does nothing but return a constant of primitive type
629 bool is_constant_getter() const;
630
631 // returns true if the method is an initializer (<init> or <clinit>).
632 bool is_initializer() const;
633
634 // returns true if the method is static OR if the classfile version < 51
635 bool has_valid_initializer_flags() const;
636
637 // returns true if the method name is <clinit> and the method has
638 // valid static initializer flags.
639 bool is_static_initializer() const;
640
641 // compiled code support
642 // NOTE: code() is inherently racy as deopt can be clearing code
643 // simultaneously. Use with caution.
644 bool has_compiled_code() const { return code() != NULL; }
645
646 // sizing
647 static int header_size() { return sizeof(Method)/wordSize; }
648 static int size(bool is_native);
649 int size() const { return method_size(); }
650 #if INCLUDE_SERVICES
651 void collect_statistics(KlassSizeStats *sz) const;
652 #endif
653 void log_touched(TRAPS);
654 static void print_touched_methods(outputStream* out);
655
656 // interpreter support
657 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
658 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
659 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
660 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
661 static ByteSize method_data_offset() {
662 return byte_offset_of(Method, _method_data);
663 }
664 static ByteSize method_counters_offset() {
665 return byte_offset_of(Method, _method_counters);
666 }
667 #ifndef PRODUCT
668 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
669 #endif // not PRODUCT
670 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
671 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
672 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
673 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
674
675 // for code generation
676 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
677 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
678 static int intrinsic_id_size_in_bytes() { return sizeof(u2); }
679
680 // Static methods that are used to implement member methods where an exposed this pointer
681 // is needed due to possible GCs
682 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
683
684 // Returns the byte code index from the byte code pointer
685 int bci_from(address bcp) const;
686 address bcp_from(int bci) const;
687 address bcp_from(address bcp) const;
688 int validate_bci_from_bcp(address bcp) const;
689 int validate_bci(int bci) const;
690
691 // Returns the line number for a bci if debugging information for the method is prowided,
692 // -1 is returned otherwise.
693 int line_number_from_bci(int bci) const;
694
695 // Reflection support
696 bool is_overridden_in(Klass* k) const;
697
698 // Stack walking support
699 bool is_ignored_by_security_stack_walk() const;
700
701 // JSR 292 support
702 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
703 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
704 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
705 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
706 Symbol* signature, //anything at all
707 TRAPS);
708 static Klass* check_non_bcp_klass(Klass* klass);
709
710 enum {
711 // How many extra stack entries for invokedynamic
712 extra_stack_entries_for_jsr292 = 1
713 };
714
715 // this operates only on invoke methods:
716 // presize interpreter frames for extra interpreter stack entries, if needed
717 // Account for the extra appendix argument for invokehandle/invokedynamic
718 static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
719 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize
720
721 // RedefineClasses() support:
722 bool is_old() const { return access_flags().is_old(); }
723 void set_is_old() { _access_flags.set_is_old(); }
724 bool is_obsolete() const { return access_flags().is_obsolete(); }
725 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
726 bool is_deleted() const { return access_flags().is_deleted(); }
727 void set_is_deleted() { _access_flags.set_is_deleted(); }
728
729 bool is_running_emcp() const {
730 // EMCP methods are old but not obsolete or deleted. Equivalent
731 // Modulo Constant Pool means the method is equivalent except
732 // the constant pool and instructions that access the constant
733 // pool might be different.
734 // If a breakpoint is set in a redefined method, its EMCP methods that are
735 // still running must have a breakpoint also.
736 return (_flags & _running_emcp) != 0;
737 }
738
739 void set_running_emcp(bool x) {
740 _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
741 }
742
743 bool on_stack() const { return access_flags().on_stack(); }
744 void set_on_stack(const bool value);
745
746 // see the definition in Method*.cpp for the gory details
747 bool should_not_be_cached() const;
748
749 // JVMTI Native method prefixing support:
750 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
751 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
752
753 // Rewriting support
754 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
755 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
756
757 // jmethodID handling
758 // Because the useful life-span of a jmethodID cannot be determined,
759 // once created they are never reclaimed. The methods to which they refer,
760 // however, can be GC'ed away if the class is unloaded or if the method is
761 // made obsolete or deleted -- in these cases, the jmethodID
762 // refers to NULL (as is the case for any weak reference).
763 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
764 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
765
766 // Ensure there is enough capacity in the internal tracking data
767 // structures to hold the number of jmethodIDs you plan to generate.
768 // This saves substantial time doing allocations.
769 static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
770
771 // Use resolve_jmethod_id() in situations where the caller is expected
772 // to provide a valid jmethodID; the only sanity checks are in asserts;
773 // result guaranteed not to be NULL.
774 inline static Method* resolve_jmethod_id(jmethodID mid) {
775 assert(mid != NULL, "JNI method id should not be null");
776 return *((Method**)mid);
777 }
778
779 // Use checked_resolve_jmethod_id() in situations where the caller
780 // should provide a valid jmethodID, but might not. NULL is returned
781 // when the jmethodID does not refer to a valid method.
782 static Method* checked_resolve_jmethod_id(jmethodID mid);
783
784 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
785 static bool is_method_id(jmethodID mid);
786
787 // Clear methods
788 static void clear_jmethod_ids(ClassLoaderData* loader_data);
789 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
790
791 // Get this method's jmethodID -- allocate if it doesn't exist
792 jmethodID jmethod_id() { methodHandle this_h(this);
793 return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
794
795 // Lookup the jmethodID for this method. Return NULL if not found.
796 // NOTE that this function can be called from a signal handler
797 // (see AsyncGetCallTrace support for Forte Analyzer) and this
798 // needs to be async-safe. No allocation should be done and
799 // so handles are not used to avoid deadlock.
800 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
801
802 // Support for inlining of intrinsic methods
803 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
804 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u2) id; }
805
806 // Helper routines for intrinsic_id() and vmIntrinsics::method().
807 void init_intrinsic_id(); // updates from _none if a match
808 static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
809
810 bool jfr_towrite() const {
811 return (_flags & _jfr_towrite) != 0;
812 }
813 void set_jfr_towrite(bool x) const {
814 _flags = x ? (_flags | _jfr_towrite) : (_flags & ~_jfr_towrite);
815 }
816
817 bool caller_sensitive() {
818 return (_flags & _caller_sensitive) != 0;
819 }
820 void set_caller_sensitive(bool x) {
821 _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
822 }
823
824 bool force_inline() {
825 return (_flags & _force_inline) != 0;
826 }
827 void set_force_inline(bool x) {
828 _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
829 }
830
831 bool dont_inline() {
832 return (_flags & _dont_inline) != 0;
833 }
834 void set_dont_inline(bool x) {
835 _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
836 }
837
838 bool is_hidden() {
839 return (_flags & _hidden) != 0;
840 }
841 void set_hidden(bool x) {
842 _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
843 }
844
845 bool intrinsic_candidate() {
846 return (_flags & _intrinsic_candidate) != 0;
847 }
848 void set_intrinsic_candidate(bool x) {
849 _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
850 }
851
852 bool has_injected_profile() {
853 return (_flags & _has_injected_profile) != 0;
854 }
855 void set_has_injected_profile(bool x) {
856 _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
857 }
858
859 bool has_reserved_stack_access() {
860 return (_flags & _reserved_stack_access) != 0;
861 }
862
863 void set_has_reserved_stack_access(bool x) {
864 _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
865 }
866
867 ConstMethod::MethodType method_type() const {
868 return _constMethod->method_type();
869 }
870 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
871
872 // On-stack replacement support
873 bool has_osr_nmethod(int level, bool match_level) {
874 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
875 }
876
877 int mark_osr_nmethods() {
878 return method_holder()->mark_osr_nmethods(this);
879 }
880
881 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
882 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
883 }
884
885 // Inline cache support
886 void cleanup_inline_caches();
887
888 // Find if klass for method is loaded
889 bool is_klass_loaded_by_klass_index(int klass_index) const;
890 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
891
892 // Indicates whether compilation failed earlier for this method, or
893 // whether it is not compilable for another reason like having a
894 // breakpoint set in it.
895 bool is_not_compilable(int comp_level = CompLevel_any) const;
896 void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
897 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
898 set_not_compilable(comp_level, false);
899 }
900 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
901 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
902 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
903 set_not_osr_compilable(comp_level, false);
904 }
905 bool is_always_compilable() const;
906
907 private:
908 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
909
910 public:
911 MethodCounters* get_method_counters(TRAPS) {
912 if (_method_counters == NULL) {
913 build_method_counters(this, CHECK_AND_CLEAR_NULL);
914 }
915 return _method_counters;
916 }
917
918 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
919 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
920 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); }
921 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
922 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
923 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); }
924
925 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit
926 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit
927 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit
928 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); }
929 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); }
930 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); }
931
932 // Background compilation support
933 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
934 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
935 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
936
937 // Resolve all classes in signature, return 'true' if successful
938 static bool load_signature_classes(methodHandle m, TRAPS);
939
940 // Return if true if not all classes references in signature, including return type, has been loaded
941 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
942
943 // Printing
944 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
945 #if INCLUDE_JVMTI
946 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
947 #else
948 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)"
949 #endif
950
951 // Helper routine used for method sorting
952 static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
953
954 // Deallocation function for redefine classes or if an error occurs
955 void deallocate_contents(ClassLoaderData* loader_data);
956
957 // Printing
958 #ifndef PRODUCT
959 void print_on(outputStream* st) const;
960 #endif
961 void print_value_on(outputStream* st) const;
962 void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
963
964 const char* internal_name() const { return "{method}"; }
965
966 // Check for valid method pointer
967 static bool has_method_vptr(const void* ptr);
968 bool is_valid_method() const;
969
970 // Verify
971 void verify() { verify_on(tty); }
972 void verify_on(outputStream* st);
973
974 private:
975
976 // Inlined elements
977 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
978 address* signature_handler_addr() const { return native_function_addr() + 1; }
979 };
980
981
982 // Utility class for compressing line number tables
983
984 class CompressedLineNumberWriteStream: public CompressedWriteStream {
985 private:
986 int _bci;
987 int _line;
988 public:
989 // Constructor
990 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
991 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
992
993 // Write (bci, line number) pair to stream
994 void write_pair_regular(int bci_delta, int line_delta);
995
996 inline void write_pair_inline(int bci, int line) {
997 int bci_delta = bci - _bci;
998 int line_delta = line - _line;
999 _bci = bci;
1000 _line = line;
1001 // Skip (0,0) deltas - they do not add information and conflict with terminator.
1002 if (bci_delta == 0 && line_delta == 0) return;
1003 // Check if bci is 5-bit and line number 3-bit unsigned.
1004 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
1005 // Compress into single byte.
1006 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
1007 // Check that value doesn't match escape character.
1008 if (value != 0xFF) {
1009 write_byte(value);
1010 return;
1011 }
1012 }
1013 write_pair_regular(bci_delta, line_delta);
1014 }
1015
1016 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
1017 // Disabling optimization doesn't work for methods in header files
1018 // so we force it to call through the non-optimized version in the .cpp.
1019 // It's gross, but it's the only way we can ensure that all callers are
1020 // fixed. _MSC_VER is defined by the windows compiler
1021 #if defined(_M_AMD64) && _MSC_VER >= 1400
1022 void write_pair(int bci, int line);
1023 #else
1024 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
1025 #endif
1026
1027 // Write end-of-stream marker
1028 void write_terminator() { write_byte(0); }
1029 };
1030
1031
1032 // Utility class for decompressing line number tables
1033
1034 class CompressedLineNumberReadStream: public CompressedReadStream {
1035 private:
1036 int _bci;
1037 int _line;
1038 public:
1039 // Constructor
1040 CompressedLineNumberReadStream(u_char* buffer);
1041 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1042 bool read_pair();
1043 // Accessing bci and line number (after calling read_pair)
1044 int bci() const { return _bci; }
1045 int line() const { return _line; }
1046 };
1047
1048
1049 #if INCLUDE_JVMTI
1050
1051 /// Fast Breakpoints.
1052
1053 // If this structure gets more complicated (because bpts get numerous),
1054 // move it into its own header.
1055
1056 // There is presently no provision for concurrent access
1057 // to breakpoint lists, which is only OK for JVMTI because
1058 // breakpoints are written only at safepoints, and are read
1059 // concurrently only outside of safepoints.
1060
1061 class BreakpointInfo : public CHeapObj<mtClass> {
1062 friend class VMStructs;
1063 private:
1064 Bytecodes::Code _orig_bytecode;
1065 int _bci;
1066 u2 _name_index; // of method
1067 u2 _signature_index; // of method
1068 BreakpointInfo* _next; // simple storage allocation
1069
1070 public:
1071 BreakpointInfo(Method* m, int bci);
1072
1073 // accessors
1074 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
1075 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1076 int bci() { return _bci; }
1077
1078 BreakpointInfo* next() const { return _next; }
1079 void set_next(BreakpointInfo* n) { _next = n; }
1080
1081 // helps for searchers
1082 bool match(const Method* m, int bci) {
1083 return bci == _bci && match(m);
1084 }
1085
1086 bool match(const Method* m) {
1087 return _name_index == m->name_index() &&
1088 _signature_index == m->signature_index();
1089 }
1090
1091 void set(Method* method);
1092 void clear(Method* method);
1093 };
1094
1095 #endif // INCLUDE_JVMTI
1096
1097 // Utility class for access exception handlers
1098 class ExceptionTable : public StackObj {
1099 private:
1100 ExceptionTableElement* _table;
1101 u2 _length;
1102
1103 public:
1104 ExceptionTable(const Method* m) {
1105 if (m->has_exception_handler()) {
1106 _table = m->exception_table_start();
1107 _length = m->exception_table_length();
1108 } else {
1109 _table = NULL;
1110 _length = 0;
1111 }
1112 }
1113
1114 int length() const {
1115 return _length;
1116 }
1117
1118 u2 start_pc(int idx) const {
1119 assert(idx < _length, "out of bounds");
1120 return _table[idx].start_pc;
1121 }
1122
1123 void set_start_pc(int idx, u2 value) {
1124 assert(idx < _length, "out of bounds");
1125 _table[idx].start_pc = value;
1126 }
1127
1128 u2 end_pc(int idx) const {
1129 assert(idx < _length, "out of bounds");
1130 return _table[idx].end_pc;
1131 }
1132
1133 void set_end_pc(int idx, u2 value) {
1134 assert(idx < _length, "out of bounds");
1135 _table[idx].end_pc = value;
1136 }
1137
1138 u2 handler_pc(int idx) const {
1139 assert(idx < _length, "out of bounds");
1140 return _table[idx].handler_pc;
1141 }
1142
1143 void set_handler_pc(int idx, u2 value) {
1144 assert(idx < _length, "out of bounds");
1145 _table[idx].handler_pc = value;
1146 }
1147
1148 u2 catch_type_index(int idx) const {
1149 assert(idx < _length, "out of bounds");
1150 return _table[idx].catch_type_index;
1151 }
1152
1153 void set_catch_type_index(int idx, u2 value) {
1154 assert(idx < _length, "out of bounds");
1155 _table[idx].catch_type_index = value;
1156 }
1157 };
1158
1159 #endif // SHARE_VM_OOPS_METHODOOP_HPP