1 /*
2 * Copyright (c) 1997, 2024, 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_OOPS_METHOD_HPP
26 #define SHARE_OOPS_METHOD_HPP
27
28 #include "code/compressedStream.hpp"
29 #include "compiler/compilerDefinitions.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constantPool.hpp"
32 #include "oops/methodFlags.hpp"
33 #include "oops/instanceKlass.hpp"
34 #include "oops/oop.hpp"
35 #include "oops/typeArrayOop.hpp"
36 #include "utilities/accessFlags.hpp"
37 #include "utilities/align.hpp"
38 #include "utilities/growableArray.hpp"
39 #include "utilities/macros.hpp"
40 #include "utilities/vmEnums.hpp"
41 #if INCLUDE_JFR
42 #include "jfr/support/jfrTraceIdExtension.hpp"
43 #endif
44
45
46 // A Method represents a Java method.
47 //
48 // Note that most applications load thousands of methods, so keeping the size of this
49 // class small has a big impact on footprint.
50 //
51 // Note that native_function and signature_handler have to be at fixed offsets
52 // (required by the interpreter)
53 //
54 // Method embedded field layout (after declared fields):
55 // [EMBEDDED native_function (present only if native) ]
56 // [EMBEDDED signature_handler (present only if native) ]
57
58 class CheckedExceptionElement;
59 class LocalVariableTableElement;
60 class AdapterHandlerEntry;
61 class MethodData;
62 class MethodCounters;
63 class ConstMethod;
64 class InlineTableSizes;
65 class nmethod;
66 class InterpreterOopMap;
67
68 class Method : public Metadata {
69 friend class VMStructs;
70 friend class JVMCIVMStructs;
71 friend class MethodTest;
72 private:
73 // If you add a new field that points to any metaspace object, you
74 // must add this field to Method::metaspace_pointers_do().
75 ConstMethod* _constMethod; // Method read-only data.
76 MethodData* _method_data;
77 MethodCounters* _method_counters;
78 AdapterHandlerEntry* _adapter;
79 AccessFlags _access_flags; // Access flags
80 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
81 MethodFlags _flags;
82
83 u2 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
84
85 JFR_ONLY(DEFINE_TRACE_FLAG;)
86
87 #ifndef PRODUCT
88 int64_t _compiled_invocation_count;
89
90 Symbol* _name;
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 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, Symbol* name);
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 Symbol* name,
115 TRAPS);
116
117 // CDS and vtbl checking can create an empty Method to get vtbl pointer.
118 Method(){}
119
120 virtual bool is_method() const { return true; }
121
122 #if INCLUDE_CDS
123 void remove_unshareable_info();
124 void restore_unshareable_info(TRAPS);
125 #endif
126
127 // accessors for instance variables
128
129 ConstMethod* constMethod() const { return _constMethod; }
130 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
131
132
133 static address make_adapters(const methodHandle& mh, TRAPS);
134 address from_compiled_entry() const;
135 address from_interpreted_entry() const;
136
137 // access flag
138 AccessFlags access_flags() const { return _access_flags; }
139 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
140
141 // name
142 Symbol* name() const { return constants()->symbol_at(name_index()); }
143 u2 name_index() const { return constMethod()->name_index(); }
144 void set_name_index(int index) { constMethod()->set_name_index(index); }
145
146 // signature
147 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
148 u2 signature_index() const { return constMethod()->signature_index(); }
149 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
150
151 // generics support
152 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : nullptr); }
153 u2 generic_signature_index() const { return constMethod()->generic_signature_index(); }
154
155 // annotations support
156 AnnotationArray* annotations() const {
157 return constMethod()->method_annotations();
158 }
159 AnnotationArray* parameter_annotations() const {
160 return constMethod()->parameter_annotations();
161 }
162 AnnotationArray* annotation_default() const {
163 return constMethod()->default_annotations();
164 }
165 AnnotationArray* type_annotations() const {
166 return constMethod()->type_annotations();
167 }
168
169 // Helper routine: get klass name + "." + method name + signature as
170 // C string, for the purpose of providing more useful
171 // fatal error handling. The string is allocated in resource
172 // area if a buffer is not provided by the caller.
173 char* name_and_sig_as_C_string() const;
174 char* name_and_sig_as_C_string(char* buf, int size) const;
175
176 // Static routine in the situations we don't have a Method*
177 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
178 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
179
180 // Get return type + klass name + "." + method name + ( parameters types )
181 // as a C string or print it to an outputStream.
182 // This is to be used to assemble strings passed to Java, so that
183 // the text more resembles Java code. Used in exception messages.
184 // Memory is allocated in the resource area; the caller needs
185 // a ResourceMark.
186 const char* external_name() const;
187 void print_external_name(outputStream *os) const;
188
189 static const char* external_name( Klass* klass, Symbol* method_name, Symbol* signature);
190 static void print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature);
191
192 Bytecodes::Code java_code_at(int bci) const {
193 return Bytecodes::java_code_at(this, bcp_from(bci));
194 }
195 Bytecodes::Code code_at(int bci) const {
196 return Bytecodes::code_at(this, bcp_from(bci));
197 }
198
199 // JVMTI breakpoints
200 #if !INCLUDE_JVMTI
201 Bytecodes::Code orig_bytecode_at(int bci) const {
202 ShouldNotReachHere();
203 return Bytecodes::_shouldnotreachhere;
204 }
205 void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
206 ShouldNotReachHere();
207 };
208 u2 number_of_breakpoints() const {return 0;}
209 #else // !INCLUDE_JVMTI
210 Bytecodes::Code orig_bytecode_at(int bci) const;
211 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
212 void set_breakpoint(int bci);
213 void clear_breakpoint(int bci);
214 void clear_all_breakpoints();
215 // Tracking number of breakpoints, for fullspeed debugging.
216 // Only mutated by VM thread.
217 inline u2 number_of_breakpoints() const;
218 inline void incr_number_of_breakpoints(Thread* current);
219 inline void decr_number_of_breakpoints(Thread* current);
220 // Initialization only
221 inline void clear_number_of_breakpoints();
222 #endif // !INCLUDE_JVMTI
223
224 // index into InstanceKlass methods() array
225 // note: also used by jfr
226 u2 method_idnum() const { return constMethod()->method_idnum(); }
227 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
228
229 u2 orig_method_idnum() const { return constMethod()->orig_method_idnum(); }
230 void set_orig_method_idnum(u2 idnum) { constMethod()->set_orig_method_idnum(idnum); }
231
232 // code size
233 u2 code_size() const { return constMethod()->code_size(); }
234
235 // method size in words
236 int method_size() const { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
237
238 // constant pool for Klass* holding this method
239 ConstantPool* constants() const { return constMethod()->constants(); }
240 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
241
242 // max stack
243 // return original max stack size for method verification
244 u2 verifier_max_stack() const { return constMethod()->max_stack(); }
245 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
246 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
247
248 // max locals
249 u2 max_locals() const { return constMethod()->max_locals(); }
250 void set_max_locals(int size) { constMethod()->set_max_locals(size); }
251
252 void set_deprecated() { constMethod()->set_deprecated(); }
253 bool deprecated() const { return constMethod()->deprecated(); }
254
255 void set_deprecated_for_removal() { constMethod()->set_deprecated_for_removal(); }
256 bool deprecated_for_removal() const { return constMethod()->deprecated_for_removal(); }
257
258 int highest_comp_level() const;
259 void set_highest_comp_level(int level);
260 int highest_osr_comp_level() const;
261 void set_highest_osr_comp_level(int level);
262
263 #if COMPILER2_OR_JVMCI
264 // Count of times method was exited via exception while interpreting
265 inline void interpreter_throwout_increment(Thread* current);
266 #endif
267
268 inline int interpreter_throwout_count() const;
269
270 u2 size_of_parameters() const { return constMethod()->size_of_parameters(); }
271
272 bool has_stackmap_table() const {
273 return constMethod()->has_stackmap_table();
274 }
275
276 Array<u1>* stackmap_data() const {
277 return constMethod()->stackmap_data();
278 }
279
280 void set_stackmap_data(Array<u1>* sd) {
281 constMethod()->set_stackmap_data(sd);
282 }
283
284 // exception handler table
285 bool has_exception_handler() const
286 { return constMethod()->has_exception_table(); }
287 u2 exception_table_length() const
288 { return constMethod()->exception_table_length(); }
289 ExceptionTableElement* exception_table_start() const
290 { return constMethod()->exception_table_start(); }
291
292 // Finds the first entry point bci of an exception handler for an
293 // exception of klass ex_klass thrown at throw_bci. A value of null
294 // for ex_klass indicates that the exception klass is not known; in
295 // this case it matches any constraint class. Returns -1 if the
296 // exception cannot be handled in this method. The handler
297 // constraint classes are loaded if necessary. Note that this may
298 // throw an exception if loading of the constraint classes causes
299 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
300 // If an exception is thrown, returns the bci of the
301 // exception handler which caused the exception to be thrown, which
302 // is needed for proper retries. See, for example,
303 // InterpreterRuntime::exception_handler_for_exception.
304 static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
305
306 static bool register_native(Klass* k,
307 Symbol* name,
308 Symbol* signature,
309 address entry,
310 TRAPS);
311
312 // method data access
313 MethodData* method_data() const {
314 return _method_data;
315 }
316
317 // mark an exception handler as entered (used to prune dead catch blocks in C2)
318 void set_exception_handler_entered(int handler_bci);
319
320 MethodCounters* method_counters() const {
321 return _method_counters;
322 }
323
324 void clear_method_counters() {
325 _method_counters = nullptr;
326 }
327
328 bool init_method_counters(MethodCounters* counters);
329
330 inline int prev_event_count() const;
331 inline void set_prev_event_count(int count);
332 inline jlong prev_time() const;
333 inline void set_prev_time(jlong time);
334 inline float rate() const;
335 inline void set_rate(float rate);
336
337 int invocation_count() const;
338 int backedge_count() const;
339
340 bool was_executed_more_than(int n);
341 bool was_never_executed() { return !was_executed_more_than(0); }
342
343 static void build_profiling_method_data(const methodHandle& method, TRAPS);
344
345 static MethodCounters* build_method_counters(Thread* current, Method* m);
346
347 int interpreter_invocation_count() { return invocation_count(); }
348
349 #ifndef PRODUCT
350 int64_t compiled_invocation_count() const { return _compiled_invocation_count;}
351 void set_compiled_invocation_count(int count) { _compiled_invocation_count = (int64_t)count; }
352 #else
353 // for PrintMethodData in a product build
354 int64_t compiled_invocation_count() const { return 0; }
355 #endif // not PRODUCT
356
357 // nmethod/verified compiler entry
358 address verified_code_entry();
359 bool check_code() const; // Not inline to avoid circular ref
360 nmethod* code() const;
361
362 // Locks NMethodState_lock if not held.
363 void unlink_code(nmethod *compare);
364 // Locks NMethodState_lock if not held.
365 void unlink_code();
366
367 private:
368 // Either called with NMethodState_lock held or from constructor.
369 void clear_code();
370
371 void clear_method_data() {
372 _method_data = nullptr;
373 }
374
375 public:
376 static void set_code(const methodHandle& mh, nmethod* code);
377 void set_adapter_entry(AdapterHandlerEntry* adapter) {
378 _adapter = adapter;
379 }
380 void set_from_compiled_entry(address entry) {
381 _from_compiled_entry = entry;
382 }
383
384 address get_i2c_entry();
385 address get_c2i_entry();
386 address get_c2i_unverified_entry();
387 address get_c2i_no_clinit_check_entry();
388 AdapterHandlerEntry* adapter() const {
389 return _adapter;
390 }
391 // setup entry points
392 void link_method(const methodHandle& method, TRAPS);
393 // clear entry points. Used by sharing code during dump time
394 void unlink_method() NOT_CDS_RETURN;
395 void remove_unshareable_flags() NOT_CDS_RETURN;
396
397 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
398 virtual MetaspaceObj::Type type() const { return MethodType; }
399
400 // vtable index
401 enum VtableIndexFlag {
402 // Valid vtable indexes are non-negative (>= 0).
403 // These few negative values are used as sentinels.
404 itable_index_max = -10, // first itable index, growing downward
405 pending_itable_index = -9, // itable index will be assigned
406 invalid_vtable_index = -4, // distinct from any valid vtable index
407 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
408 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
409 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
410 };
411 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
412 bool has_vtable_index() const { return _vtable_index >= 0; }
413 int vtable_index() const { return _vtable_index; }
414 void set_vtable_index(int index);
415 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; })
416 bool has_itable_index() const { return _vtable_index <= itable_index_max; }
417 int itable_index() const { assert(valid_itable_index(), "");
418 return itable_index_max - _vtable_index; }
419 void set_itable_index(int index);
420
421 // interpreter entry
422 address interpreter_entry() const { return _i2i_entry; }
423 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
424 void set_interpreter_entry(address entry) {
425 if (_i2i_entry != entry) {
426 _i2i_entry = entry;
427 }
428 if (_from_interpreted_entry != entry) {
429 _from_interpreted_entry = entry;
430 }
431 }
432
433 // native function (used for native methods only)
434 enum {
435 native_bind_event_is_interesting = true
436 };
437 address native_function() const { return *(native_function_addr()); }
438
439 // Must specify a real function (not null).
440 // Use clear_native_function() to unregister.
441 void set_native_function(address function, bool post_event_flag);
442 bool has_native_function() const;
443 void clear_native_function();
444
445 // signature handler (used for native methods only)
446 address signature_handler() const { return *(signature_handler_addr()); }
447 void set_signature_handler(address handler);
448
449 // Interpreter oopmap support
450 void mask_for(int bci, InterpreterOopMap* mask);
451
452 // operations on invocation counter
453 void print_invocation_count(outputStream* st);
454
455 // byte codes
456 void set_code(address code) { return constMethod()->set_code(code); }
457 address code_base() const { return constMethod()->code_base(); }
458 bool contains(address bcp) const { return constMethod()->contains(bcp); }
459
460 // prints byte codes
461 void print_codes(int flags = 0) const { print_codes_on(tty, flags); }
462 void print_codes_on(outputStream* st, int flags = 0) const;
463 void print_codes_on(int from, int to, outputStream* st, int flags = 0) const;
464
465 // method parameters
466 bool has_method_parameters() const
467 { return constMethod()->has_method_parameters(); }
468 int method_parameters_length() const
469 { return constMethod()->method_parameters_length(); }
470 MethodParametersElement* method_parameters_start() const
471 { return constMethod()->method_parameters_start(); }
472
473 // checked exceptions
474 u2 checked_exceptions_length() const
475 { return constMethod()->checked_exceptions_length(); }
476 CheckedExceptionElement* checked_exceptions_start() const
477 { return constMethod()->checked_exceptions_start(); }
478
479 // localvariable table
480 bool has_localvariable_table() const
481 { return constMethod()->has_localvariable_table(); }
482 u2 localvariable_table_length() const
483 { return constMethod()->localvariable_table_length(); }
484 LocalVariableTableElement* localvariable_table_start() const
485 { return constMethod()->localvariable_table_start(); }
486
487 bool has_linenumber_table() const
488 { return constMethod()->has_linenumber_table(); }
489 u_char* compressed_linenumber_table() const
490 { return constMethod()->compressed_linenumber_table(); }
491
492 // method holder (the Klass* holding this method)
493 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
494
495 Symbol* klass_name() const; // returns the name of the method holder
496 BasicType result_type() const { return constMethod()->result_type(); }
497 bool is_returning_oop() const { BasicType r = result_type(); return is_reference_type(r); }
498 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
499
500 // Checked exceptions thrown by this method (resolved to mirrors)
501 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
502
503 // Access flags
504 bool is_public() const { return access_flags().is_public(); }
505 bool is_private() const { return access_flags().is_private(); }
506 bool is_protected() const { return access_flags().is_protected(); }
507 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
508 bool is_static() const { return access_flags().is_static(); }
509 bool is_final() const { return access_flags().is_final(); }
510 bool is_synchronized() const { return access_flags().is_synchronized();}
511 bool is_native() const { return access_flags().is_native(); }
512 bool is_abstract() const { return access_flags().is_abstract(); }
513 bool is_synthetic() const { return access_flags().is_synthetic(); }
514
515 // returns true if contains only return operation
516 bool is_empty_method() const;
517
518 // returns true if this is a vanilla constructor
519 bool is_vanilla_constructor() const;
520
521 // checks method and its method holder
522 bool is_final_method() const;
523 bool is_final_method(AccessFlags class_access_flags) const;
524 // interface method declared with 'default' - excludes private interface methods
525 bool is_default_method() const;
526
527 // true if method needs no dynamic dispatch (final and/or no vtable entry)
528 bool can_be_statically_bound() const;
529 bool can_be_statically_bound(InstanceKlass* context) const;
530 bool can_be_statically_bound(AccessFlags class_access_flags) const;
531
532 // true if method can omit stack trace in throw in compiled code.
533 bool can_omit_stack_trace();
534
535 // Flags getting and setting.
536 #define M_STATUS_GET_SET(name, ignore) \
537 bool name() const { return _flags.name(); } \
538 void set_##name(bool x) { _flags.set_##name(x); } \
539 void set_##name() { _flags.set_##name(true); }
540 M_STATUS_DO(M_STATUS_GET_SET)
541 #undef M_STATUS_GET_SET
542
543 // returns true if the method has any backward branches.
544 bool has_loops() {
545 return has_loops_flag_init() ? has_loops_flag() : compute_has_loops_flag();
546 };
547
548 bool compute_has_loops_flag();
549 bool set_has_loops() {
550 // set both the flags and that it's been initialized.
551 set_has_loops_flag();
552 set_has_loops_flag_init();
553 return true;
554 }
555
556 // returns true if the method has any monitors.
557 bool has_monitors() const { return is_synchronized() || has_monitor_bytecodes(); }
558
559 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
560 // properly nest in the method. It might return false, even though they actually nest properly, since the info.
561 // has not been computed yet.
562 bool guaranteed_monitor_matching() const { return monitor_matching(); }
563 void set_guaranteed_monitor_matching() { set_monitor_matching(); }
564
565 // returns true if the method is an accessor function (setter/getter).
566 bool is_accessor() const;
567
568 // returns true if the method is a getter
569 bool is_getter() const;
570
571 // returns true if the method is a setter
572 bool is_setter() const;
573
574 // returns true if the method does nothing but return a constant of primitive type
575 bool is_constant_getter() const;
576
577 // returns true if the method is an initializer (<init> or <clinit>).
578 bool is_initializer() const;
579
580 // returns true if the method is static OR if the classfile version < 51
581 bool has_valid_initializer_flags() const;
582
583 // returns true if the method name is <clinit> and the method has
584 // valid static initializer flags.
585 bool is_static_initializer() const;
586
587 // returns true if the method name is <init>
588 bool is_object_initializer() const;
589
590 // compiled code support
591 // NOTE: code() is inherently racy as deopt can be clearing code
592 // simultaneously. Use with caution.
593 bool has_compiled_code() const;
594
595 bool needs_clinit_barrier() const;
596
597 // sizing
598 static int header_size() {
599 return align_up((int)sizeof(Method), wordSize) / wordSize;
600 }
601 static int size(bool is_native);
602 int size() const { return method_size(); }
603 void log_touched(Thread* current);
604 static void print_touched_methods(outputStream* out);
605
606 // interpreter support
607 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
608 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
609 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
610 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
611
612 static ByteSize method_counters_offset() {
613 return byte_offset_of(Method, _method_counters);
614 }
615 #ifndef PRODUCT
616 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
617 #endif // not PRODUCT
618 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
619 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
620 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
621 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
622 static ByteSize itable_index_offset() { return byte_offset_of(Method, _vtable_index ); }
623
624 // for code generation
625 static ByteSize method_data_offset() { return byte_offset_of(Method, _method_data); }
626 static ByteSize intrinsic_id_offset() { return byte_offset_of(Method, _intrinsic_id); }
627 static int intrinsic_id_size_in_bytes() { return sizeof(u2); }
628
629 // Static methods that are used to implement member methods where an exposed this pointer
630 // is needed due to possible GCs
631 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
632
633 // Returns the byte code index from the byte code pointer
634 int bci_from(address bcp) const;
635 address bcp_from(int bci) const;
636 address bcp_from(address bcp) const;
637 int validate_bci_from_bcp(address bcp) const;
638 int validate_bci(int bci) const;
639
640 // Returns the line number for a bci if debugging information for the method is prowided,
641 // -1 is returned otherwise.
642 int line_number_from_bci(int bci) const;
643
644 // Reflection support
645 bool is_overridden_in(Klass* k) const;
646
647 // Stack walking support
648 bool is_ignored_by_security_stack_walk() const;
649
650 // JSR 292 support
651 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
652 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
653 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
654 static methodHandle make_method_handle_intrinsic(vmIntrinsicID iid, // _invokeBasic, _linkToVirtual
655 Symbol* signature, //anything at all
656 TRAPS);
657 // Some special methods don't need to be findable by nmethod iterators and are permanent.
658 bool can_be_allocated_in_NonNMethod_space() const { return is_method_handle_intrinsic(); }
659
660 // Continuation
661 inline bool is_continuation_enter_intrinsic() const;
662 inline bool is_continuation_yield_intrinsic() const;
663 inline bool is_continuation_native_intrinsic() const;
664 inline bool is_special_native_intrinsic() const;
665
666 static Klass* check_non_bcp_klass(Klass* klass);
667
668 enum {
669 // How many extra stack entries for invokedynamic
670 extra_stack_entries_for_jsr292 = 1
671 };
672
673 // this operates only on invoke methods:
674 // presize interpreter frames for extra interpreter stack entries, if needed
675 // Account for the extra appendix argument for invokehandle/invokedynamic
676 static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
677 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize
678
679 // RedefineClasses() support:
680 bool on_stack() const { return on_stack_flag(); }
681 void set_on_stack(const bool value);
682
683 void record_gc_epoch();
684
685 // see the definition in Method*.cpp for the gory details
686 bool should_not_be_cached() const;
687
688 // Rewriting support
689 static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
690 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
691
692 // jmethodID handling
693 // Because the useful life-span of a jmethodID cannot be determined,
694 // once created they are never reclaimed. The methods to which they refer,
695 // however, can be GC'ed away if the class is unloaded or if the method is
696 // made obsolete or deleted -- in these cases, the jmethodID
697 // refers to null (as is the case for any weak reference).
698 static jmethodID make_jmethod_id(ClassLoaderData* cld, Method* mh);
699
700 // Ensure there is enough capacity in the internal tracking data
701 // structures to hold the number of jmethodIDs you plan to generate.
702 // This saves substantial time doing allocations.
703 static void ensure_jmethod_ids(ClassLoaderData* cld, int capacity);
704
705 // Use resolve_jmethod_id() in situations where the caller is expected
706 // to provide a valid jmethodID; the only sanity checks are in asserts;
707 // result guaranteed not to be null.
708 inline static Method* resolve_jmethod_id(jmethodID mid) {
709 assert(mid != nullptr, "JNI method id should not be null");
710 return *((Method**)mid);
711 }
712
713 // Use checked_resolve_jmethod_id() in situations where the caller
714 // should provide a valid jmethodID, but might not. Null is returned
715 // when the jmethodID does not refer to a valid method.
716 static Method* checked_resolve_jmethod_id(jmethodID mid);
717
718 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
719 static bool is_method_id(jmethodID mid);
720
721 // Clear methods
722 static void clear_jmethod_ids(ClassLoaderData* loader_data);
723 void clear_jmethod_id();
724 static void print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
725
726 // Get this method's jmethodID -- allocate if it doesn't exist
727 jmethodID jmethod_id();
728
729 // Lookup the jmethodID for this method. Return null if not found.
730 // NOTE that this function can be called from a signal handler
731 // (see AsyncGetCallTrace support for Forte Analyzer) and this
732 // needs to be async-safe. No allocation should be done and
733 // so handles are not used to avoid deadlock.
734 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
735
736 // Support for inlining of intrinsic methods
737 vmIntrinsicID intrinsic_id() const { return (vmIntrinsicID) _intrinsic_id; }
738 void set_intrinsic_id(vmIntrinsicID id) { _intrinsic_id = (u2) id; }
739
740 // Helper routines for intrinsic_id() and vmIntrinsics::method().
741 void init_intrinsic_id(vmSymbolID klass_id); // updates from _none if a match
742 static vmSymbolID klass_id_for_intrinsics(const Klass* holder);
743
744 bool caller_sensitive() const { return constMethod()->caller_sensitive(); }
745 void set_caller_sensitive() { constMethod()->set_caller_sensitive(); }
746
747 bool changes_current_thread() const { return constMethod()->changes_current_thread(); }
748 void set_changes_current_thread() { constMethod()->set_changes_current_thread(); }
749
750 bool jvmti_mount_transition() const { return constMethod()->jvmti_mount_transition(); }
751 void set_jvmti_mount_transition() { constMethod()->set_jvmti_mount_transition(); }
752
753 bool is_hidden() const { return constMethod()->is_hidden(); }
754 void set_is_hidden() { constMethod()->set_is_hidden(); }
755
756 bool is_scoped() const { return constMethod()->is_scoped(); }
757 void set_scoped() { constMethod()->set_is_scoped(); }
758
759 bool intrinsic_candidate() const { return constMethod()->intrinsic_candidate(); }
760 void set_intrinsic_candidate() { constMethod()->set_intrinsic_candidate(); }
761
762 bool has_injected_profile() const { return constMethod()->has_injected_profile(); }
763 void set_has_injected_profile() { constMethod()->set_has_injected_profile(); }
764
765 bool has_reserved_stack_access() const { return constMethod()->reserved_stack_access(); }
766 void set_has_reserved_stack_access() { constMethod()->set_reserved_stack_access(); }
767
768 JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
769
770 ConstMethod::MethodType method_type() const {
771 return _constMethod->method_type();
772 }
773 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
774
775 // On-stack replacement support
776 bool has_osr_nmethod(int level, bool match_level) {
777 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != nullptr;
778 }
779
780 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
781 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
782 }
783
784 // Find if klass for method is loaded
785 bool is_klass_loaded_by_klass_index(int klass_index) const;
786 bool is_klass_loaded(int refinfo_index, Bytecodes::Code bc, bool must_be_resolved = false) const;
787
788 // Indicates whether compilation failed earlier for this method, or
789 // whether it is not compilable for another reason like having a
790 // breakpoint set in it.
791 bool is_not_compilable(int comp_level = CompLevel_any) const;
792 void set_not_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
793 void set_not_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
794 set_not_compilable(reason, comp_level, false);
795 }
796 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
797 void set_not_osr_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
798 void set_not_osr_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
799 set_not_osr_compilable(reason, comp_level, false);
800 }
801 bool is_always_compilable() const;
802
803 private:
804 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
805
806 public:
807 MethodCounters* get_method_counters(Thread* current) {
808 if (_method_counters == nullptr) {
809 build_method_counters(current, this);
810 }
811 return _method_counters;
812 }
813
814 void clear_is_not_c1_compilable() { set_is_not_c1_compilable(false); }
815 void clear_is_not_c2_compilable() { set_is_not_c2_compilable(false); }
816 void clear_is_not_c2_osr_compilable() { set_is_not_c2_osr_compilable(false); }
817
818 // not_c1_osr_compilable == not_c1_compilable
819 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); }
820 void set_is_not_c1_osr_compilable() { set_is_not_c1_compilable(); }
821 void clear_is_not_c1_osr_compilable() { clear_is_not_c1_compilable(); }
822
823 // Background compilation support
824 void clear_queued_for_compilation() { set_queued_for_compilation(false); }
825
826 // Resolve all classes in signature, return 'true' if successful
827 static bool load_signature_classes(const methodHandle& m, TRAPS);
828
829 // Printing
830 void print_short_name(outputStream* st = tty) const; // prints as klassname::methodname; Exposed so field engineers can debug VM
831 #if INCLUDE_JVMTI
832 void print_name(outputStream* st = tty) const; // prints as "virtual void foo(int)"; exposed for -Xlog:redefine+class
833 #else
834 void print_name(outputStream* st = tty) const PRODUCT_RETURN; // prints as "virtual void foo(int)"
835 #endif
836
837 typedef int (*method_comparator_func)(Method* a, Method* b);
838
839 // Helper routine used for method sorting
840 static void sort_methods(Array<Method*>* methods, bool set_idnums = true, method_comparator_func func = nullptr);
841
842 // Deallocation function for redefine classes or if an error occurs
843 void deallocate_contents(ClassLoaderData* loader_data);
844
845 void release_C_heap_structures();
846
847 Method* get_new_method() const {
848 InstanceKlass* holder = method_holder();
849 Method* new_method = holder->method_with_idnum(orig_method_idnum());
850
851 assert(new_method != nullptr, "method_with_idnum() should not be null");
852 assert(this != new_method, "sanity check");
853 return new_method;
854 }
855
856 // Printing
857 #ifndef PRODUCT
858 void print_on(outputStream* st) const;
859 #endif
860 void print_value_on(outputStream* st) const;
861 void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
862
863 const char* internal_name() const { return "{method}"; }
864
865 // Check for valid method pointer
866 static bool has_method_vptr(const void* ptr);
867 static bool is_valid_method(const Method* m);
868
869 // Verify
870 void verify() { verify_on(tty); }
871 void verify_on(outputStream* st);
872
873 private:
874
875 // Inlined elements
876 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
877 address* signature_handler_addr() const { return native_function_addr() + 1; }
878 };
879
880
881 // Utility class for compressing line number tables
882
883 class CompressedLineNumberWriteStream: public CompressedWriteStream {
884 private:
885 int _bci;
886 int _line;
887 public:
888 // Constructor
889 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
890 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
891
892 // Write (bci, line number) pair to stream
893 void write_pair_regular(int bci_delta, int line_delta);
894
895 // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
896 // we save it as one byte, otherwise we write a 0xFF escape character
897 // and use regular compression. 0x0 is used as end-of-stream terminator.
898 void write_pair_inline(int bci, int line);
899
900 void write_pair(int bci, int line);
901
902 // Write end-of-stream marker
903 void write_terminator() { write_byte(0); }
904 };
905
906
907 // Utility class for decompressing line number tables
908
909 class CompressedLineNumberReadStream: public CompressedReadStream {
910 private:
911 int _bci;
912 int _line;
913 public:
914 // Constructor
915 CompressedLineNumberReadStream(u_char* buffer);
916 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
917 bool read_pair();
918 // Accessing bci and line number (after calling read_pair)
919 int bci() const { return _bci; }
920 int line() const { return _line; }
921 };
922
923
924 #if INCLUDE_JVMTI
925
926 /// Fast Breakpoints.
927
928 // If this structure gets more complicated (because bpts get numerous),
929 // move it into its own header.
930
931 // There is presently no provision for concurrent access
932 // to breakpoint lists, which is only OK for JVMTI because
933 // breakpoints are written only at safepoints, and are read
934 // concurrently only outside of safepoints.
935
936 class BreakpointInfo : public CHeapObj<mtClass> {
937 friend class VMStructs;
938 private:
939 Bytecodes::Code _orig_bytecode;
940 int _bci;
941 u2 _name_index; // of method
942 u2 _signature_index; // of method
943 BreakpointInfo* _next; // simple storage allocation
944
945 public:
946 BreakpointInfo(Method* m, int bci);
947
948 // accessors
949 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
950 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
951 int bci() { return _bci; }
952
953 BreakpointInfo* next() const { return _next; }
954 void set_next(BreakpointInfo* n) { _next = n; }
955
956 // helps for searchers
957 bool match(const Method* m, int bci) {
958 return bci == _bci && match(m);
959 }
960
961 bool match(const Method* m) {
962 return _name_index == m->name_index() &&
963 _signature_index == m->signature_index();
964 }
965
966 void set(Method* method);
967 void clear(Method* method);
968 };
969
970 #endif // INCLUDE_JVMTI
971
972 // Utility class for access exception handlers
973 class ExceptionTable : public StackObj {
974 private:
975 ExceptionTableElement* _table;
976 u2 _length;
977
978 public:
979 ExceptionTable(const Method* m) {
980 if (m->has_exception_handler()) {
981 _table = m->exception_table_start();
982 _length = m->exception_table_length();
983 } else {
984 _table = nullptr;
985 _length = 0;
986 }
987 }
988
989 u2 length() const {
990 return _length;
991 }
992
993 u2 start_pc(int idx) const {
994 assert(idx < _length, "out of bounds");
995 return _table[idx].start_pc;
996 }
997
998 void set_start_pc(int idx, u2 value) {
999 assert(idx < _length, "out of bounds");
1000 _table[idx].start_pc = value;
1001 }
1002
1003 u2 end_pc(int idx) const {
1004 assert(idx < _length, "out of bounds");
1005 return _table[idx].end_pc;
1006 }
1007
1008 void set_end_pc(int idx, u2 value) {
1009 assert(idx < _length, "out of bounds");
1010 _table[idx].end_pc = value;
1011 }
1012
1013 u2 handler_pc(int idx) const {
1014 assert(idx < _length, "out of bounds");
1015 return _table[idx].handler_pc;
1016 }
1017
1018 void set_handler_pc(int idx, u2 value) {
1019 assert(idx < _length, "out of bounds");
1020 _table[idx].handler_pc = value;
1021 }
1022
1023 u2 catch_type_index(int idx) const {
1024 assert(idx < _length, "out of bounds");
1025 return _table[idx].catch_type_index;
1026 }
1027
1028 void set_catch_type_index(int idx, u2 value) {
1029 assert(idx < _length, "out of bounds");
1030 _table[idx].catch_type_index = value;
1031 }
1032 };
1033
1034 #endif // SHARE_OOPS_METHOD_HPP