1 /*
2 * Copyright (c) 1997, 2019, 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 "classfile/vmSymbols.hpp"
29 #include "code/compressedStream.hpp"
30 #include "compiler/compilerDefinitions.hpp"
31 #include "compiler/oopMap.hpp"
32 #include "interpreter/invocationCounter.hpp"
33 #include "oops/annotations.hpp"
34 #include "oops/constantPool.hpp"
35 #include "oops/methodCounters.hpp"
36 #include "oops/instanceKlass.hpp"
37 #include "oops/oop.hpp"
38 #include "oops/typeArrayOop.hpp"
39 #include "utilities/accessFlags.hpp"
40 #include "utilities/align.hpp"
41 #include "utilities/growableArray.hpp"
42 #include "utilities/macros.hpp"
43 #if INCLUDE_JFR
44 #include "jfr/support/jfrTraceIdExtension.hpp"
45 #endif
46
47
48 // A Method represents a Java method.
49 //
50 // Note that most applications load thousands of methods, so keeping the size of this
51 // class small has a big impact on footprint.
52 //
53 // Note that native_function and signature_handler have to be at fixed offsets
54 // (required by the interpreter)
55 //
56 // Method embedded field layout (after declared fields):
57 // [EMBEDDED native_function (present only if native) ]
58 // [EMBEDDED signature_handler (present only if native) ]
59
60 class CheckedExceptionElement;
61 class LocalVariableTableElement;
62 class AdapterHandlerEntry;
63 class MethodData;
64 class MethodCounters;
65 class ConstMethod;
66 class InlineTableSizes;
67 class KlassSizeStats;
68 class CompiledMethod;
69 class InterpreterOopMap;
70
71 class Method : public Metadata {
72 friend class VMStructs;
73 friend class JVMCIVMStructs;
74 private:
75 // If you add a new field that points to any metaspace object, you
76 // must add this field to Method::metaspace_pointers_do().
77 ConstMethod* _constMethod; // Method read-only data.
78 MethodData* _method_data;
79 MethodCounters* _method_counters;
80 AccessFlags _access_flags; // Access flags
81 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
82 // note: can have vtables with >2**16 elements (because of inheritance)
83 u2 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
84
85 // Flags
86 enum Flags {
87 _caller_sensitive = 1 << 0,
88 _force_inline = 1 << 1,
89 _dont_inline = 1 << 2,
90 _hidden = 1 << 3,
91 _has_injected_profile = 1 << 4,
92 _running_emcp = 1 << 5,
93 _intrinsic_candidate = 1 << 6,
94 _reserved_stack_access = 1 << 7,
95 _scalarized_args = 1 << 8,
96 _c1_needs_stack_repair = 1 << 9,
97 _c2_needs_stack_repair = 1 << 10
98 };
99 mutable u2 _flags;
100
101 JFR_ONLY(DEFINE_TRACE_FLAG;)
102
103 #ifndef PRODUCT
104 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
105 #endif
106 // Entry point for calling both from and to the interpreter.
107 address _i2i_entry; // All-args-on-stack calling convention
108 // Entry point for calling from compiled code, to compiled code if it exists
109 // or else the interpreter.
110 volatile address _from_compiled_entry; // Cache of: _code ? _code->verified_entry_point() : _adapter->c2i_entry()
111 volatile address _from_compiled_value_ro_entry; // Cache of: _code ? _code->verified_value_ro_entry_point() : _adapter->c2i_value_ro_entry()
112 volatile address _from_compiled_value_entry; // Cache of: _code ? _code->verified_value_entry_point() : _adapter->c2i_value_entry()
113 // The entry point for calling both from and to compiled code is
114 // "_code->entry_point()". Because of tiered compilation and de-opt, this
115 // field can come and go. It can transition from NULL to not-null at any
116 // time (whenever a compile completes). It can transition from not-null to
117 // NULL only at safepoints (because of a de-opt).
118 CompiledMethod* volatile _code; // Points to the corresponding piece of native code
119 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
120 int _max_vt_buffer; // max number of VT buffer chunk to use before recycling
121
122 #if INCLUDE_AOT && defined(TIERED)
123 CompiledMethod* _aot_code;
124 #endif
125
126 // Constructor
127 Method(ConstMethod* xconst, AccessFlags access_flags);
128 public:
129
130 static Method* allocate(ClassLoaderData* loader_data,
131 int byte_code_size,
132 AccessFlags access_flags,
133 InlineTableSizes* sizes,
134 ConstMethod::MethodType method_type,
135 TRAPS);
136
137 // CDS and vtbl checking can create an empty Method to get vtbl pointer.
138 Method(){}
139
140 bool is_method() const volatile { return true; }
141
142 void restore_unshareable_info(TRAPS);
143
144 // accessors for instance variables
145
146 ConstMethod* constMethod() const { return _constMethod; }
147 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
148
149
150 static address make_adapters(const methodHandle& mh, TRAPS);
151 address from_compiled_entry() const;
152 address from_compiled_entry_no_trampoline(bool caller_is_c1) const;
153 address from_interpreted_entry() const;
154
155 // access flag
156 AccessFlags access_flags() const { return _access_flags; }
157 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
158
159 // name
160 Symbol* name() const { return constants()->symbol_at(name_index()); }
161 int name_index() const { return constMethod()->name_index(); }
162 void set_name_index(int index) { constMethod()->set_name_index(index); }
163
164 // signature
165 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
166 int signature_index() const { return constMethod()->signature_index(); }
167 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
168
169 // generics support
170 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
171 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
172 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
173
174 // annotations support
175 AnnotationArray* annotations() const {
176 return constMethod()->method_annotations();
177 }
178 AnnotationArray* parameter_annotations() const {
179 return constMethod()->parameter_annotations();
180 }
181 AnnotationArray* annotation_default() const {
182 return constMethod()->default_annotations();
183 }
184 AnnotationArray* type_annotations() const {
185 return constMethod()->type_annotations();
186 }
187
188 // Helper routine: get klass name + "." + method name + signature as
189 // C string, for the purpose of providing more useful
190 // fatal error handling. The string is allocated in resource
191 // area if a buffer is not provided by the caller.
192 char* name_and_sig_as_C_string() const;
193 char* name_and_sig_as_C_string(char* buf, int size) const;
194
195 // Static routine in the situations we don't have a Method*
196 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
197 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
198
199 // Get return type + klass name + "." + method name + ( parameters types )
200 // as a C string or print it to an outputStream.
201 // This is to be used to assemble strings passed to Java, so that
202 // the text more resembles Java code. Used in exception messages.
203 // Memory is allocated in the resource area; the caller needs
204 // a ResourceMark.
205 const char* external_name() const;
206 void print_external_name(outputStream *os) const;
207
208 static const char* external_name( Klass* klass, Symbol* method_name, Symbol* signature);
209 static void print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature);
210
211 Bytecodes::Code java_code_at(int bci) const {
212 return Bytecodes::java_code_at(this, bcp_from(bci));
213 }
214 Bytecodes::Code code_at(int bci) const {
215 return Bytecodes::code_at(this, bcp_from(bci));
216 }
217
218 // JVMTI breakpoints
219 #if !INCLUDE_JVMTI
220 Bytecodes::Code orig_bytecode_at(int bci) const {
221 ShouldNotReachHere();
222 return Bytecodes::_shouldnotreachhere;
223 }
224 void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
225 ShouldNotReachHere();
226 };
227 u2 number_of_breakpoints() const {return 0;}
228 #else // !INCLUDE_JVMTI
229 Bytecodes::Code orig_bytecode_at(int bci) const;
230 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
231 void set_breakpoint(int bci);
232 void clear_breakpoint(int bci);
233 void clear_all_breakpoints();
234 // Tracking number of breakpoints, for fullspeed debugging.
235 // Only mutated by VM thread.
236 u2 number_of_breakpoints() const {
237 MethodCounters* mcs = method_counters();
238 if (mcs == NULL) {
239 return 0;
240 } else {
241 return mcs->number_of_breakpoints();
242 }
243 }
244 void incr_number_of_breakpoints(TRAPS) {
245 MethodCounters* mcs = get_method_counters(CHECK);
246 if (mcs != NULL) {
247 mcs->incr_number_of_breakpoints();
248 }
249 }
250 void decr_number_of_breakpoints(TRAPS) {
251 MethodCounters* mcs = get_method_counters(CHECK);
252 if (mcs != NULL) {
253 mcs->decr_number_of_breakpoints();
254 }
255 }
256 // Initialization only
257 void clear_number_of_breakpoints() {
258 MethodCounters* mcs = method_counters();
259 if (mcs != NULL) {
260 mcs->clear_number_of_breakpoints();
261 }
262 }
263 #endif // !INCLUDE_JVMTI
264
265 // index into InstanceKlass methods() array
266 // note: also used by jfr
267 u2 method_idnum() const { return constMethod()->method_idnum(); }
268 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
269
270 u2 orig_method_idnum() const { return constMethod()->orig_method_idnum(); }
271 void set_orig_method_idnum(u2 idnum) { constMethod()->set_orig_method_idnum(idnum); }
272
273 // code size
274 int code_size() const { return constMethod()->code_size(); }
275
276 // method size in words
277 int method_size() const { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
278
279 // constant pool for Klass* holding this method
280 ConstantPool* constants() const { return constMethod()->constants(); }
281 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
282
283 // max stack
284 // return original max stack size for method verification
285 int verifier_max_stack() const { return constMethod()->max_stack(); }
286 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
287 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
288
289 // max locals
290 int max_locals() const { return constMethod()->max_locals(); }
291 void set_max_locals(int size) { constMethod()->set_max_locals(size); }
292
293 int highest_comp_level() const;
294 void set_highest_comp_level(int level);
295 int highest_osr_comp_level() const;
296 void set_highest_osr_comp_level(int level);
297
298 #if COMPILER2_OR_JVMCI
299 // Count of times method was exited via exception while interpreting
300 void interpreter_throwout_increment(TRAPS) {
301 MethodCounters* mcs = get_method_counters(CHECK);
302 if (mcs != NULL) {
303 mcs->interpreter_throwout_increment();
304 }
305 }
306 #endif
307
308 int interpreter_throwout_count() const {
309 MethodCounters* mcs = method_counters();
310 if (mcs == NULL) {
311 return 0;
312 } else {
313 return mcs->interpreter_throwout_count();
314 }
315 }
316
317 // size of parameters
318 int size_of_parameters() const { return constMethod()->size_of_parameters(); }
319 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); }
320
321 bool has_stackmap_table() const {
322 return constMethod()->has_stackmap_table();
323 }
324
325 Array<u1>* stackmap_data() const {
326 return constMethod()->stackmap_data();
327 }
328
329 void set_stackmap_data(Array<u1>* sd) {
330 constMethod()->set_stackmap_data(sd);
331 }
332
333 // exception handler table
334 bool has_exception_handler() const
335 { return constMethod()->has_exception_handler(); }
336 int exception_table_length() const
337 { return constMethod()->exception_table_length(); }
338 ExceptionTableElement* exception_table_start() const
339 { return constMethod()->exception_table_start(); }
340
341 // Finds the first entry point bci of an exception handler for an
342 // exception of klass ex_klass thrown at throw_bci. A value of NULL
343 // for ex_klass indicates that the exception klass is not known; in
344 // this case it matches any constraint class. Returns -1 if the
345 // exception cannot be handled in this method. The handler
346 // constraint classes are loaded if necessary. Note that this may
347 // throw an exception if loading of the constraint classes causes
348 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
349 // If an exception is thrown, returns the bci of the
350 // exception handler which caused the exception to be thrown, which
351 // is needed for proper retries. See, for example,
352 // InterpreterRuntime::exception_handler_for_exception.
353 static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
354
355 // method data access
356 MethodData* method_data() const {
357 return _method_data;
358 }
359
360 void set_method_data(MethodData* data);
361
362 MethodCounters* method_counters() const {
363 return _method_counters;
364 }
365
366 void clear_method_counters() {
367 _method_counters = NULL;
368 }
369
370 bool init_method_counters(MethodCounters* counters);
371
372 #ifdef TIERED
373 // We are reusing interpreter_invocation_count as a holder for the previous event count!
374 // We can do that since interpreter_invocation_count is not used in tiered.
375 int prev_event_count() const {
376 if (method_counters() == NULL) {
377 return 0;
378 } else {
379 return method_counters()->interpreter_invocation_count();
380 }
381 }
382 void set_prev_event_count(int count) {
383 MethodCounters* mcs = method_counters();
384 if (mcs != NULL) {
385 mcs->set_interpreter_invocation_count(count);
386 }
387 }
388 jlong prev_time() const {
389 MethodCounters* mcs = method_counters();
390 return mcs == NULL ? 0 : mcs->prev_time();
391 }
392 void set_prev_time(jlong time) {
393 MethodCounters* mcs = method_counters();
394 if (mcs != NULL) {
395 mcs->set_prev_time(time);
396 }
397 }
398 float rate() const {
399 MethodCounters* mcs = method_counters();
400 return mcs == NULL ? 0 : mcs->rate();
401 }
402 void set_rate(float rate) {
403 MethodCounters* mcs = method_counters();
404 if (mcs != NULL) {
405 mcs->set_rate(rate);
406 }
407 }
408
409 #if INCLUDE_AOT
410 void set_aot_code(CompiledMethod* aot_code) {
411 _aot_code = aot_code;
412 }
413
414 CompiledMethod* aot_code() const {
415 return _aot_code;
416 }
417 #else
418 CompiledMethod* aot_code() const { return NULL; }
419 #endif // INCLUDE_AOT
420 #endif // TIERED
421
422 int nmethod_age() const {
423 if (method_counters() == NULL) {
424 return INT_MAX;
425 } else {
426 return method_counters()->nmethod_age();
427 }
428 }
429
430 int invocation_count();
431 int backedge_count();
432
433 bool was_executed_more_than(int n);
434 bool was_never_executed() { return !was_executed_more_than(0); }
435
436 static void build_interpreter_method_data(const methodHandle& method, TRAPS);
437
438 static MethodCounters* build_method_counters(Method* m, TRAPS);
439
440 int interpreter_invocation_count() {
441 if (TieredCompilation) {
442 return invocation_count();
443 } else {
444 MethodCounters* mcs = method_counters();
445 return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
446 }
447 }
448 #if COMPILER2_OR_JVMCI
449 int increment_interpreter_invocation_count(TRAPS) {
450 if (TieredCompilation) ShouldNotReachHere();
451 MethodCounters* mcs = get_method_counters(CHECK_0);
452 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
453 }
454 #endif
455
456 #ifndef PRODUCT
457 int compiled_invocation_count() const { return _compiled_invocation_count; }
458 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
459 #else
460 // for PrintMethodData in a product build
461 int compiled_invocation_count() const { return 0; }
462 #endif // not PRODUCT
463
464 // Clear (non-shared space) pointers which could not be relevant
465 // if this (shared) method were mapped into another JVM.
466 void remove_unshareable_info();
467
468 // nmethod/verified compiler entry
469 address verified_code_entry();
470 address verified_value_code_entry();
471 address verified_value_ro_code_entry();
472 bool check_code() const; // Not inline to avoid circular ref
473 CompiledMethod* volatile code() const;
474
475 // Locks CompiledMethod_lock if not held.
476 void unlink_code(CompiledMethod *compare);
477 // Locks CompiledMethod_lock if not held.
478 void unlink_code();
479
480 private:
481 // Either called with CompiledMethod_lock held or from constructor.
482 void clear_code();
483
484 public:
485 static void set_code(const methodHandle& mh, CompiledMethod* code);
486 void set_adapter_entry(AdapterHandlerEntry* adapter) {
487 constMethod()->set_adapter_entry(adapter);
488 }
489 void set_adapter_trampoline(AdapterHandlerEntry** trampoline) {
490 constMethod()->set_adapter_trampoline(trampoline);
491 }
492 void update_adapter_trampoline(AdapterHandlerEntry* adapter) {
493 constMethod()->update_adapter_trampoline(adapter);
494 }
495 void set_from_compiled_entry(address entry) {
496 _from_compiled_entry = entry;
497 }
498
499 address get_i2c_entry();
500 address get_c2i_entry();
501 address get_c2i_value_entry();
502 address get_c2i_unverified_entry();
503 address get_c2i_unverified_value_entry();
504 AdapterHandlerEntry* adapter() const {
505 return constMethod()->adapter();
506 }
507 // setup entry points
508 void link_method(const methodHandle& method, TRAPS);
509 // clear entry points. Used by sharing code during dump time
510 void unlink_method() NOT_CDS_RETURN;
511
512 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
513 virtual MetaspaceObj::Type type() const { return MethodType; }
514
515 // vtable index
516 enum VtableIndexFlag {
517 // Valid vtable indexes are non-negative (>= 0).
518 // These few negative values are used as sentinels.
519 itable_index_max = -10, // first itable index, growing downward
520 pending_itable_index = -9, // itable index will be assigned
521 invalid_vtable_index = -4, // distinct from any valid vtable index
522 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
523 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
524 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
525 };
526 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
527 bool has_vtable_index() const { return _vtable_index >= 0; }
528 int vtable_index() const { return _vtable_index; }
529 void set_vtable_index(int index);
530 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; })
531 bool has_itable_index() const { return _vtable_index <= itable_index_max; }
532 int itable_index() const { assert(valid_itable_index(), "");
533 return itable_index_max - _vtable_index; }
534 void set_itable_index(int index);
535
536 // interpreter entry
537 address interpreter_entry() const { return _i2i_entry; }
538 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
539 void set_interpreter_entry(address entry) {
540 assert(!is_shared(),
541 "shared method's interpreter entry should not be changed at run time");
542 if (_i2i_entry != entry) {
543 _i2i_entry = entry;
544 }
545 if (_from_interpreted_entry != entry) {
546 _from_interpreted_entry = entry;
547 }
548 }
549
550 // native function (used for native methods only)
551 enum {
552 native_bind_event_is_interesting = true
553 };
554 address native_function() const { return *(native_function_addr()); }
555 address critical_native_function();
556
557 // Must specify a real function (not NULL).
558 // Use clear_native_function() to unregister.
559 void set_native_function(address function, bool post_event_flag);
560 bool has_native_function() const;
561 void clear_native_function();
562
563 // signature handler (used for native methods only)
564 address signature_handler() const { return *(signature_handler_addr()); }
565 void set_signature_handler(address handler);
566
567 // Interpreter oopmap support
568 void mask_for(int bci, InterpreterOopMap* mask);
569
570 // operations on invocation counter
571 void print_invocation_count();
572
573 // byte codes
574 void set_code(address code) { return constMethod()->set_code(code); }
575 address code_base() const { return constMethod()->code_base(); }
576 bool contains(address bcp) const { return constMethod()->contains(bcp); }
577
578 // prints byte codes
579 void print_codes() const { print_codes_on(tty); }
580 void print_codes_on(outputStream* st) const;
581 void print_codes_on(int from, int to, outputStream* st) const;
582
583 // method parameters
584 bool has_method_parameters() const
585 { return constMethod()->has_method_parameters(); }
586 int method_parameters_length() const
587 { return constMethod()->method_parameters_length(); }
588 MethodParametersElement* method_parameters_start() const
589 { return constMethod()->method_parameters_start(); }
590
591 // checked exceptions
592 int checked_exceptions_length() const
593 { return constMethod()->checked_exceptions_length(); }
594 CheckedExceptionElement* checked_exceptions_start() const
595 { return constMethod()->checked_exceptions_start(); }
596
597 // localvariable table
598 bool has_localvariable_table() const
599 { return constMethod()->has_localvariable_table(); }
600 int localvariable_table_length() const
601 { return constMethod()->localvariable_table_length(); }
602 LocalVariableTableElement* localvariable_table_start() const
603 { return constMethod()->localvariable_table_start(); }
604
605 bool has_linenumber_table() const
606 { return constMethod()->has_linenumber_table(); }
607 u_char* compressed_linenumber_table() const
608 { return constMethod()->compressed_linenumber_table(); }
609
610 // method holder (the Klass* holding this method)
611 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
612
613 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
614 Symbol* klass_name() const; // returns the name of the method holder
615 BasicType result_type() const; // type of the method result
616 bool may_return_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY || r == T_VALUETYPE); }
617 ValueKlass* returned_value_type(Thread* thread) const;
618
619 // Checked exceptions thrown by this method (resolved to mirrors)
620 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
621
622 // Access flags
623 bool is_public() const { return access_flags().is_public(); }
624 bool is_private() const { return access_flags().is_private(); }
625 bool is_protected() const { return access_flags().is_protected(); }
626 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
627 bool is_static() const { return access_flags().is_static(); }
628 bool is_final() const { return access_flags().is_final(); }
629 bool is_synchronized() const { return access_flags().is_synchronized();}
630 bool is_native() const { return access_flags().is_native(); }
631 bool is_abstract() const { return access_flags().is_abstract(); }
632 bool is_strict() const { return access_flags().is_strict(); }
633 bool is_synthetic() const { return access_flags().is_synthetic(); }
634
635 // returns true if contains only return operation
636 bool is_empty_method() const;
637
638 // returns true if this is a vanilla constructor
639 bool is_vanilla_constructor() const;
640
641 // checks method and its method holder
642 bool is_final_method() const;
643 bool is_final_method(AccessFlags class_access_flags) const;
644 // interface method declared with 'default' - excludes private interface methods
645 bool is_default_method() const;
646
647 // true if method needs no dynamic dispatch (final and/or no vtable entry)
648 bool can_be_statically_bound() const;
649 bool can_be_statically_bound(InstanceKlass* context) const;
650 bool can_be_statically_bound(AccessFlags class_access_flags) const;
651
652 // returns true if the method has any backward branches.
653 bool has_loops() {
654 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
655 };
656
657 bool compute_has_loops_flag();
658
659 bool has_jsrs() {
660 return access_flags().has_jsrs();
661 };
662 void set_has_jsrs() {
663 _access_flags.set_has_jsrs();
664 }
665
666 // returns true if the method has any monitors.
667 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
668 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
669
670 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
671
672 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
673 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
674 // has not been computed yet.
675 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
676 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
677
678 // returns true if the method is an accessor function (setter/getter).
679 bool is_accessor() const;
680
681 // returns true if the method is a getter
682 bool is_getter() const;
683
684 // returns true if the method is a setter
685 bool is_setter() const;
686
687 // returns true if the method does nothing but return a constant of primitive type
688 bool is_constant_getter() const;
689
690 // returns true if the method name is <clinit> and the method has
691 // valid static initializer flags.
692 bool is_class_initializer() const;
693
694 // returns true if the method name is <init> and the method is not a static factory
695 bool is_object_constructor() const;
696
697 // returns true if the method is an object constructor or class initializer
698 // (non-static <init> or <clinit>), but false for factories (static <init>).
699 bool is_object_constructor_or_class_initializer() const;
700
701 // returns true if the method name is <init> and the method is static
702 bool is_static_init_factory() const;
703
704 // compiled code support
705 // NOTE: code() is inherently racy as deopt can be clearing code
706 // simultaneously. Use with caution.
707 bool has_compiled_code() const;
708
709 #ifdef TIERED
710 bool has_aot_code() const { return aot_code() != NULL; }
711 #endif
712
713 bool needs_clinit_barrier() const;
714
715 // sizing
716 static int header_size() {
717 return align_up((int)sizeof(Method), wordSize) / wordSize;
718 }
719 static int size(bool is_native);
720 int size() const { return method_size(); }
721 #if INCLUDE_SERVICES
722 void collect_statistics(KlassSizeStats *sz) const;
723 #endif
724 void log_touched(TRAPS);
725 static void print_touched_methods(outputStream* out);
726
727 // interpreter support
728 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
729 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
730 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
731 static ByteSize from_compiled_value_offset() { return byte_offset_of(Method, _from_compiled_value_entry); }
732 static ByteSize from_compiled_value_ro_offset(){ return byte_offset_of(Method, _from_compiled_value_ro_entry); }
733 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
734 static ByteSize flags_offset() { return byte_offset_of(Method, _flags); }
735 static ByteSize method_data_offset() {
736 return byte_offset_of(Method, _method_data);
737 }
738 static ByteSize method_counters_offset() {
739 return byte_offset_of(Method, _method_counters);
740 }
741 #ifndef PRODUCT
742 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
743 #endif // not PRODUCT
744 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
745 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
746 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
747 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
748 static ByteSize itable_index_offset() { return byte_offset_of(Method, _vtable_index ); }
749
750 // for code generation
751 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
752 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
753 static int intrinsic_id_size_in_bytes() { return sizeof(u2); }
754
755 static ByteSize max_vt_buffer_offset() { return byte_offset_of(Method, _max_vt_buffer); }
756
757 // Static methods that are used to implement member methods where an exposed this pointer
758 // is needed due to possible GCs
759 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
760
761 // Returns the byte code index from the byte code pointer
762 int bci_from(address bcp) const;
763 address bcp_from(int bci) const;
764 address bcp_from(address bcp) const;
765 int validate_bci_from_bcp(address bcp) const;
766 int validate_bci(int bci) const;
767
768 // Returns the line number for a bci if debugging information for the method is prowided,
769 // -1 is returned otherwise.
770 int line_number_from_bci(int bci) const;
771
772 // Reflection support
773 bool is_overridden_in(Klass* k) const;
774
775 // Stack walking support
776 bool is_ignored_by_security_stack_walk() const;
777
778 // JSR 292 support
779 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
780 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
781 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
782 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
783 Symbol* signature, //anything at all
784 TRAPS);
785 static Klass* check_non_bcp_klass(Klass* klass);
786
787 enum {
788 // How many extra stack entries for invokedynamic
789 extra_stack_entries_for_jsr292 = 1
790 };
791
792 // this operates only on invoke methods:
793 // presize interpreter frames for extra interpreter stack entries, if needed
794 // Account for the extra appendix argument for invokehandle/invokedynamic
795 static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
796 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize
797
798 // RedefineClasses() support:
799 bool is_old() const { return access_flags().is_old(); }
800 void set_is_old() { _access_flags.set_is_old(); }
801 bool is_obsolete() const { return access_flags().is_obsolete(); }
802 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
803 bool is_deleted() const { return access_flags().is_deleted(); }
804 void set_is_deleted() { _access_flags.set_is_deleted(); }
805
806 bool is_running_emcp() const {
807 // EMCP methods are old but not obsolete or deleted. Equivalent
808 // Modulo Constant Pool means the method is equivalent except
809 // the constant pool and instructions that access the constant
810 // pool might be different.
811 // If a breakpoint is set in a redefined method, its EMCP methods that are
812 // still running must have a breakpoint also.
813 return (_flags & _running_emcp) != 0;
814 }
815
816 void set_running_emcp(bool x) {
817 _flags = x ? (_flags | _running_emcp) : (_flags & ~_running_emcp);
818 }
819
820 bool on_stack() const { return access_flags().on_stack(); }
821 void set_on_stack(const bool value);
822
823 // see the definition in Method*.cpp for the gory details
824 bool should_not_be_cached() const;
825
826 // JVMTI Native method prefixing support:
827 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
828 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
829
830 // Rewriting support
831 static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
832 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
833
834 // jmethodID handling
835 // Because the useful life-span of a jmethodID cannot be determined,
836 // once created they are never reclaimed. The methods to which they refer,
837 // however, can be GC'ed away if the class is unloaded or if the method is
838 // made obsolete or deleted -- in these cases, the jmethodID
839 // refers to NULL (as is the case for any weak reference).
840 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
841 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
842
843 // Ensure there is enough capacity in the internal tracking data
844 // structures to hold the number of jmethodIDs you plan to generate.
845 // This saves substantial time doing allocations.
846 static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
847
848 // Use resolve_jmethod_id() in situations where the caller is expected
849 // to provide a valid jmethodID; the only sanity checks are in asserts;
850 // result guaranteed not to be NULL.
851 inline static Method* resolve_jmethod_id(jmethodID mid) {
852 assert(mid != NULL, "JNI method id should not be null");
853 return *((Method**)mid);
854 }
855
856 // Use checked_resolve_jmethod_id() in situations where the caller
857 // should provide a valid jmethodID, but might not. NULL is returned
858 // when the jmethodID does not refer to a valid method.
859 static Method* checked_resolve_jmethod_id(jmethodID mid);
860
861 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
862 static bool is_method_id(jmethodID mid);
863
864 // Clear methods
865 static void clear_jmethod_ids(ClassLoaderData* loader_data);
866 static void print_jmethod_ids(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
867
868 // Get this method's jmethodID -- allocate if it doesn't exist
869 jmethodID jmethod_id() { return method_holder()->get_jmethod_id(this); }
870
871 // Lookup the jmethodID for this method. Return NULL if not found.
872 // NOTE that this function can be called from a signal handler
873 // (see AsyncGetCallTrace support for Forte Analyzer) and this
874 // needs to be async-safe. No allocation should be done and
875 // so handles are not used to avoid deadlock.
876 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
877
878 // Support for inlining of intrinsic methods
879 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
880 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u2) id; }
881
882 // Helper routines for intrinsic_id() and vmIntrinsics::method().
883 void init_intrinsic_id(); // updates from _none if a match
884 static vmSymbols::SID klass_id_for_intrinsics(const Klass* holder);
885
886 bool caller_sensitive() {
887 return (_flags & _caller_sensitive) != 0;
888 }
889 void set_caller_sensitive(bool x) {
890 _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
891 }
892
893 bool force_inline() {
894 return (_flags & _force_inline) != 0;
895 }
896 void set_force_inline(bool x) {
897 _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
898 }
899
900 bool dont_inline() {
901 return (_flags & _dont_inline) != 0;
902 }
903 void set_dont_inline(bool x) {
904 _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
905 }
906
907 bool is_hidden() {
908 return (_flags & _hidden) != 0;
909 }
910 void set_hidden(bool x) {
911 _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
912 }
913
914 bool intrinsic_candidate() {
915 return (_flags & _intrinsic_candidate) != 0;
916 }
917 void set_intrinsic_candidate(bool x) {
918 _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
919 }
920
921 bool has_injected_profile() {
922 return (_flags & _has_injected_profile) != 0;
923 }
924 void set_has_injected_profile(bool x) {
925 _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
926 }
927
928 bool has_reserved_stack_access() {
929 return (_flags & _reserved_stack_access) != 0;
930 }
931
932 void set_has_reserved_stack_access(bool x) {
933 _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
934 }
935
936 bool has_scalarized_args() {
937 return (_flags & _scalarized_args) != 0;
938 }
939
940 void set_has_scalarized_args(bool x) {
941 _flags = x ? (_flags | _scalarized_args) : (_flags & ~_scalarized_args);
942 }
943
944 bool c1_needs_stack_repair() {
945 return (_flags & _c1_needs_stack_repair) != 0;
946 }
947
948 bool c2_needs_stack_repair() {
949 return (_flags & _c2_needs_stack_repair) != 0;
950 }
951
952 void set_c1_needs_stack_repair(bool x) {
953 _flags = x ? (_flags | _c1_needs_stack_repair) : (_flags & ~_c1_needs_stack_repair);
954 }
955
956 void set_c2_needs_stack_repair(bool x) {
957 _flags = x ? (_flags | _c2_needs_stack_repair) : (_flags & ~_c2_needs_stack_repair);
958 }
959
960 JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
961
962 ConstMethod::MethodType method_type() const {
963 return _constMethod->method_type();
964 }
965 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
966
967 // On-stack replacement support
968 bool has_osr_nmethod(int level, bool match_level) {
969 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
970 }
971
972 int mark_osr_nmethods() {
973 return method_holder()->mark_osr_nmethods(this);
974 }
975
976 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
977 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
978 }
979
980 // Find if klass for method is loaded
981 bool is_klass_loaded_by_klass_index(int klass_index) const;
982 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
983
984 // Indicates whether compilation failed earlier for this method, or
985 // whether it is not compilable for another reason like having a
986 // breakpoint set in it.
987 bool is_not_compilable(int comp_level = CompLevel_any) const;
988 void set_not_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
989 void set_not_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
990 set_not_compilable(reason, comp_level, false);
991 }
992 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
993 void set_not_osr_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
994 void set_not_osr_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
995 set_not_osr_compilable(reason, comp_level, false);
996 }
997 bool is_always_compilable() const;
998
999 private:
1000 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
1001
1002 public:
1003 MethodCounters* get_method_counters(TRAPS) {
1004 if (_method_counters == NULL) {
1005 build_method_counters(this, CHECK_AND_CLEAR_NULL);
1006 }
1007 return _method_counters;
1008 }
1009
1010 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
1011 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
1012 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); }
1013 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
1014 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
1015 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); }
1016
1017 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit
1018 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit
1019 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit
1020 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); }
1021 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); }
1022 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); }
1023
1024 // Background compilation support
1025 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
1026 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
1027 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
1028
1029 // Resolve all classes in signature, return 'true' if successful
1030 static bool load_signature_classes(const methodHandle& m, TRAPS);
1031
1032 // Return if true if not all classes references in signature, including return type, has been loaded
1033 static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
1034
1035 // Printing
1036 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
1037 #if INCLUDE_JVMTI
1038 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
1039 #else
1040 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)"
1041 #endif
1042
1043 // Helper routine used for method sorting
1044 static void sort_methods(Array<Method*>* methods, bool set_idnums = true);
1045
1046 // Deallocation function for redefine classes or if an error occurs
1047 void deallocate_contents(ClassLoaderData* loader_data);
1048
1049 Method* get_new_method() const {
1050 InstanceKlass* holder = method_holder();
1051 Method* new_method = holder->method_with_idnum(orig_method_idnum());
1052
1053 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1054 assert(this != new_method, "sanity check");
1055 return new_method;
1056 }
1057
1058 // Printing
1059 #ifndef PRODUCT
1060 void print_on(outputStream* st) const;
1061 #endif
1062 void print_value_on(outputStream* st) const;
1063 void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1064
1065 const char* internal_name() const { return "{method}"; }
1066
1067 // Check for valid method pointer
1068 static bool has_method_vptr(const void* ptr);
1069 static bool is_valid_method(const Method* m);
1070
1071 // Verify
1072 void verify() { verify_on(tty); }
1073 void verify_on(outputStream* st);
1074
1075 private:
1076
1077 // Inlined elements
1078 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
1079 address* signature_handler_addr() const { return native_function_addr() + 1; }
1080 };
1081
1082
1083 // Utility class for compressing line number tables
1084
1085 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1086 private:
1087 int _bci;
1088 int _line;
1089 public:
1090 // Constructor
1091 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1092 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1093
1094 // Write (bci, line number) pair to stream
1095 void write_pair_regular(int bci_delta, int line_delta);
1096
1097 // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1098 // we save it as one byte, otherwise we write a 0xFF escape character
1099 // and use regular compression. 0x0 is used as end-of-stream terminator.
1100 void write_pair_inline(int bci, int line);
1101
1102 void write_pair(int bci, int line);
1103
1104 // Write end-of-stream marker
1105 void write_terminator() { write_byte(0); }
1106 };
1107
1108
1109 // Utility class for decompressing line number tables
1110
1111 class CompressedLineNumberReadStream: public CompressedReadStream {
1112 private:
1113 int _bci;
1114 int _line;
1115 public:
1116 // Constructor
1117 CompressedLineNumberReadStream(u_char* buffer);
1118 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1119 bool read_pair();
1120 // Accessing bci and line number (after calling read_pair)
1121 int bci() const { return _bci; }
1122 int line() const { return _line; }
1123 };
1124
1125
1126 #if INCLUDE_JVMTI
1127
1128 /// Fast Breakpoints.
1129
1130 // If this structure gets more complicated (because bpts get numerous),
1131 // move it into its own header.
1132
1133 // There is presently no provision for concurrent access
1134 // to breakpoint lists, which is only OK for JVMTI because
1135 // breakpoints are written only at safepoints, and are read
1136 // concurrently only outside of safepoints.
1137
1138 class BreakpointInfo : public CHeapObj<mtClass> {
1139 friend class VMStructs;
1140 private:
1141 Bytecodes::Code _orig_bytecode;
1142 int _bci;
1143 u2 _name_index; // of method
1144 u2 _signature_index; // of method
1145 BreakpointInfo* _next; // simple storage allocation
1146
1147 public:
1148 BreakpointInfo(Method* m, int bci);
1149
1150 // accessors
1151 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
1152 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1153 int bci() { return _bci; }
1154
1155 BreakpointInfo* next() const { return _next; }
1156 void set_next(BreakpointInfo* n) { _next = n; }
1157
1158 // helps for searchers
1159 bool match(const Method* m, int bci) {
1160 return bci == _bci && match(m);
1161 }
1162
1163 bool match(const Method* m) {
1164 return _name_index == m->name_index() &&
1165 _signature_index == m->signature_index();
1166 }
1167
1168 void set(Method* method);
1169 void clear(Method* method);
1170 };
1171
1172 #endif // INCLUDE_JVMTI
1173
1174 // Utility class for access exception handlers
1175 class ExceptionTable : public StackObj {
1176 private:
1177 ExceptionTableElement* _table;
1178 u2 _length;
1179
1180 public:
1181 ExceptionTable(const Method* m) {
1182 if (m->has_exception_handler()) {
1183 _table = m->exception_table_start();
1184 _length = m->exception_table_length();
1185 } else {
1186 _table = NULL;
1187 _length = 0;
1188 }
1189 }
1190
1191 int length() const {
1192 return _length;
1193 }
1194
1195 u2 start_pc(int idx) const {
1196 assert(idx < _length, "out of bounds");
1197 return _table[idx].start_pc;
1198 }
1199
1200 void set_start_pc(int idx, u2 value) {
1201 assert(idx < _length, "out of bounds");
1202 _table[idx].start_pc = value;
1203 }
1204
1205 u2 end_pc(int idx) const {
1206 assert(idx < _length, "out of bounds");
1207 return _table[idx].end_pc;
1208 }
1209
1210 void set_end_pc(int idx, u2 value) {
1211 assert(idx < _length, "out of bounds");
1212 _table[idx].end_pc = value;
1213 }
1214
1215 u2 handler_pc(int idx) const {
1216 assert(idx < _length, "out of bounds");
1217 return _table[idx].handler_pc;
1218 }
1219
1220 void set_handler_pc(int idx, u2 value) {
1221 assert(idx < _length, "out of bounds");
1222 _table[idx].handler_pc = value;
1223 }
1224
1225 u2 catch_type_index(int idx) const {
1226 assert(idx < _length, "out of bounds");
1227 return _table[idx].catch_type_index;
1228 }
1229
1230 void set_catch_type_index(int idx, u2 value) {
1231 assert(idx < _length, "out of bounds");
1232 _table[idx].catch_type_index = value;
1233 }
1234 };
1235
1236 #endif // SHARE_OOPS_METHOD_HPP