1 /*
2 * Copyright (c) 1997, 2022, 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 "interpreter/invocationCounter.hpp"
31 #include "oops/annotations.hpp"
32 #include "oops/constantPool.hpp"
33 #include "oops/methodCounters.hpp"
34 #include "oops/instanceKlass.hpp"
35 #include "oops/oop.hpp"
36 #include "oops/typeArrayOop.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/align.hpp"
39 #include "utilities/growableArray.hpp"
40 #include "utilities/macros.hpp"
41 #include "utilities/vmEnums.hpp"
42 #if INCLUDE_JFR
43 #include "jfr/support/jfrTraceIdExtension.hpp"
44 #endif
45
46
47 // A Method represents a Java method.
48 //
49 // Note that most applications load thousands of methods, so keeping the size of this
50 // class small has a big impact on footprint.
51 //
52 // Note that native_function and signature_handler have to be at fixed offsets
53 // (required by the interpreter)
54 //
55 // Method embedded field layout (after declared fields):
56 // [EMBEDDED native_function (present only if native) ]
57 // [EMBEDDED signature_handler (present only if native) ]
58
59 class CheckedExceptionElement;
60 class LocalVariableTableElement;
61 class AdapterHandlerEntry;
62 class MethodData;
63 class MethodCounters;
64 class ConstMethod;
65 class InlineTableSizes;
66 class CompiledMethod;
67 class InterpreterOopMap;
68
69 class Method : public Metadata {
70 friend class VMStructs;
71 friend class JVMCIVMStructs;
72 friend class MethodTest;
73 private:
74 // If you add a new field that points to any metaspace object, you
75 // must add this field to Method::metaspace_pointers_do().
76 ConstMethod* _constMethod; // Method read-only data.
77 MethodData* _method_data;
78 MethodCounters* _method_counters;
79 AdapterHandlerEntry* _adapter;
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 _intrinsic_candidate = 1 << 5,
93 _reserved_stack_access = 1 << 6,
94 _scalarized_args = 1 << 7,
95 _scalarized_return = 1 << 8,
96 _c1_needs_stack_repair = 1 << 9,
97 _c2_needs_stack_repair = 1 << 10,
98 _scoped = 1 << 11,
99 _changes_current_thread = 1 << 12,
100 _jvmti_mount_transition = 1 << 13,
101 };
102 mutable u2 _flags;
103
104 JFR_ONLY(DEFINE_TRACE_FLAG;)
105
106 #ifndef PRODUCT
107 int64_t _compiled_invocation_count;
108
109 Symbol* _name;
110 #endif
111 // Entry point for calling both from and to the interpreter.
112 address _i2i_entry; // All-args-on-stack calling convention
113 // Entry point for calling from compiled code, to compiled code if it exists
114 // or else the interpreter.
115 volatile address _from_compiled_entry; // Cache of: _code ? _code->verified_entry_point() : _adapter->c2i_entry()
116 volatile address _from_compiled_inline_ro_entry; // Cache of: _code ? _code->verified_inline_ro_entry_point() : _adapter->c2i_inline_ro_entry()
117 volatile address _from_compiled_inline_entry; // Cache of: _code ? _code->verified_inline_entry_point() : _adapter->c2i_inline_entry()
118 // The entry point for calling both from and to compiled code is
119 // "_code->entry_point()". Because of tiered compilation and de-opt, this
120 // field can come and go. It can transition from NULL to not-null at any
121 // time (whenever a compile completes). It can transition from not-null to
122 // NULL only at safepoints (because of a de-opt).
123 CompiledMethod* volatile _code; // Points to the corresponding piece of native code
124 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
125
126 // Constructor
127 Method(ConstMethod* xconst, AccessFlags access_flags, Symbol* name);
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 Symbol* name,
136 TRAPS);
137
138 // CDS and vtbl checking can create an empty Method to get vtbl pointer.
139 Method(){}
140
141 virtual bool is_method() const { return true; }
142
143 #if INCLUDE_CDS
144 void remove_unshareable_info();
145 void restore_unshareable_info(TRAPS);
146 #endif
147
148 // accessors for instance variables
149
150 ConstMethod* constMethod() const { return _constMethod; }
151 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
152
153
154 static address make_adapters(const methodHandle& mh, TRAPS);
155 address from_compiled_entry() const;
156 address from_compiled_inline_ro_entry() const;
157 address from_compiled_inline_entry() const;
158 address from_compiled_entry_no_trampoline(bool caller_is_c1) const;
159 address from_interpreted_entry() const;
160
161 // access flag
162 AccessFlags access_flags() const { return _access_flags; }
163 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
164
165 // name
166 Symbol* name() const { return constants()->symbol_at(name_index()); }
167 int name_index() const { return constMethod()->name_index(); }
168 void set_name_index(int index) { constMethod()->set_name_index(index); }
169
170 // signature
171 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
172 int signature_index() const { return constMethod()->signature_index(); }
173 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
174
175 // generics support
176 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
177 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
178 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
179
180 // annotations support
181 AnnotationArray* annotations() const {
182 return constMethod()->method_annotations();
183 }
184 AnnotationArray* parameter_annotations() const {
185 return constMethod()->parameter_annotations();
186 }
187 AnnotationArray* annotation_default() const {
188 return constMethod()->default_annotations();
189 }
190 AnnotationArray* type_annotations() const {
191 return constMethod()->type_annotations();
192 }
193
194 // Helper routine: get klass name + "." + method name + signature as
195 // C string, for the purpose of providing more useful
196 // fatal error handling. The string is allocated in resource
197 // area if a buffer is not provided by the caller.
198 char* name_and_sig_as_C_string() const;
199 char* name_and_sig_as_C_string(char* buf, int size) const;
200
201 // Static routine in the situations we don't have a Method*
202 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
203 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
204
205 // Get return type + klass name + "." + method name + ( parameters types )
206 // as a C string or print it to an outputStream.
207 // This is to be used to assemble strings passed to Java, so that
208 // the text more resembles Java code. Used in exception messages.
209 // Memory is allocated in the resource area; the caller needs
210 // a ResourceMark.
211 const char* external_name() const;
212 void print_external_name(outputStream *os) const;
213
214 static const char* external_name( Klass* klass, Symbol* method_name, Symbol* signature);
215 static void print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature);
216
217 Bytecodes::Code java_code_at(int bci) const {
218 return Bytecodes::java_code_at(this, bcp_from(bci));
219 }
220 Bytecodes::Code code_at(int bci) const {
221 return Bytecodes::code_at(this, bcp_from(bci));
222 }
223
224 // JVMTI breakpoints
225 #if !INCLUDE_JVMTI
226 Bytecodes::Code orig_bytecode_at(int bci) const {
227 ShouldNotReachHere();
228 return Bytecodes::_shouldnotreachhere;
229 }
230 void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
231 ShouldNotReachHere();
232 };
233 u2 number_of_breakpoints() const {return 0;}
234 #else // !INCLUDE_JVMTI
235 Bytecodes::Code orig_bytecode_at(int bci) const;
236 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
237 void set_breakpoint(int bci);
238 void clear_breakpoint(int bci);
239 void clear_all_breakpoints();
240 // Tracking number of breakpoints, for fullspeed debugging.
241 // Only mutated by VM thread.
242 u2 number_of_breakpoints() const {
243 MethodCounters* mcs = method_counters();
244 if (mcs == NULL) {
245 return 0;
246 } else {
247 return mcs->number_of_breakpoints();
248 }
249 }
250 void incr_number_of_breakpoints(Thread* current) {
251 MethodCounters* mcs = get_method_counters(current);
252 if (mcs != NULL) {
253 mcs->incr_number_of_breakpoints();
254 }
255 }
256 void decr_number_of_breakpoints(Thread* current) {
257 MethodCounters* mcs = get_method_counters(current);
258 if (mcs != NULL) {
259 mcs->decr_number_of_breakpoints();
260 }
261 }
262 // Initialization only
263 void clear_number_of_breakpoints() {
264 MethodCounters* mcs = method_counters();
265 if (mcs != NULL) {
266 mcs->clear_number_of_breakpoints();
267 }
268 }
269 #endif // !INCLUDE_JVMTI
270
271 // index into InstanceKlass methods() array
272 // note: also used by jfr
273 u2 method_idnum() const { return constMethod()->method_idnum(); }
274 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
275
276 u2 orig_method_idnum() const { return constMethod()->orig_method_idnum(); }
277 void set_orig_method_idnum(u2 idnum) { constMethod()->set_orig_method_idnum(idnum); }
278
279 // code size
280 int code_size() const { return constMethod()->code_size(); }
281
282 // method size in words
283 int method_size() const { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
284
285 // constant pool for Klass* holding this method
286 ConstantPool* constants() const { return constMethod()->constants(); }
287 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
288
289 // max stack
290 // return original max stack size for method verification
291 int verifier_max_stack() const { return constMethod()->max_stack(); }
292 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
293 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
294
295 // max locals
296 int max_locals() const { return constMethod()->max_locals(); }
297 void set_max_locals(int size) { constMethod()->set_max_locals(size); }
298
299 int highest_comp_level() const;
300 void set_highest_comp_level(int level);
301 int highest_osr_comp_level() const;
302 void set_highest_osr_comp_level(int level);
303
304 #if COMPILER2_OR_JVMCI
305 // Count of times method was exited via exception while interpreting
306 void interpreter_throwout_increment(Thread* current) {
307 MethodCounters* mcs = get_method_counters(current);
308 if (mcs != NULL) {
309 mcs->interpreter_throwout_increment();
310 }
311 }
312 #endif
313
314 int interpreter_throwout_count() const {
315 MethodCounters* mcs = method_counters();
316 if (mcs == NULL) {
317 return 0;
318 } else {
319 return mcs->interpreter_throwout_count();
320 }
321 }
322
323 // Derive stuff from the signature at load time.
324 void compute_from_signature(Symbol* sig);
325
326 // size of parameters (receiver if any + arguments)
327 int size_of_parameters() const { return constMethod()->size_of_parameters(); }
328 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); }
329
330 bool has_stackmap_table() const {
331 return constMethod()->has_stackmap_table();
332 }
333
334 Array<u1>* stackmap_data() const {
335 return constMethod()->stackmap_data();
336 }
337
338 void set_stackmap_data(Array<u1>* sd) {
339 constMethod()->set_stackmap_data(sd);
340 }
341
342 // exception handler table
343 bool has_exception_handler() const
344 { return constMethod()->has_exception_handler(); }
345 int exception_table_length() const
346 { return constMethod()->exception_table_length(); }
347 ExceptionTableElement* exception_table_start() const
348 { return constMethod()->exception_table_start(); }
349
350 // Finds the first entry point bci of an exception handler for an
351 // exception of klass ex_klass thrown at throw_bci. A value of NULL
352 // for ex_klass indicates that the exception klass is not known; in
353 // this case it matches any constraint class. Returns -1 if the
354 // exception cannot be handled in this method. The handler
355 // constraint classes are loaded if necessary. Note that this may
356 // throw an exception if loading of the constraint classes causes
357 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
358 // If an exception is thrown, returns the bci of the
359 // exception handler which caused the exception to be thrown, which
360 // is needed for proper retries. See, for example,
361 // InterpreterRuntime::exception_handler_for_exception.
362 static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
363
364 static bool register_native(Klass* k,
365 Symbol* name,
366 Symbol* signature,
367 address entry,
368 TRAPS);
369
370 // method data access
371 MethodData* method_data() const {
372 return _method_data;
373 }
374
375 void set_method_data(MethodData* data);
376
377 MethodCounters* method_counters() const {
378 return _method_counters;
379 }
380
381 void clear_method_counters() {
382 _method_counters = NULL;
383 }
384
385 bool init_method_counters(MethodCounters* counters);
386
387 int prev_event_count() const {
388 MethodCounters* mcs = method_counters();
389 return mcs == NULL ? 0 : mcs->prev_event_count();
390 }
391 void set_prev_event_count(int count) {
392 MethodCounters* mcs = method_counters();
393 if (mcs != NULL) {
394 mcs->set_prev_event_count(count);
395 }
396 }
397 jlong prev_time() const {
398 MethodCounters* mcs = method_counters();
399 return mcs == NULL ? 0 : mcs->prev_time();
400 }
401 void set_prev_time(jlong time) {
402 MethodCounters* mcs = method_counters();
403 if (mcs != NULL) {
404 mcs->set_prev_time(time);
405 }
406 }
407 float rate() const {
408 MethodCounters* mcs = method_counters();
409 return mcs == NULL ? 0 : mcs->rate();
410 }
411 void set_rate(float rate) {
412 MethodCounters* mcs = method_counters();
413 if (mcs != NULL) {
414 mcs->set_rate(rate);
415 }
416 }
417
418 int invocation_count() const;
419 int backedge_count() const;
420
421 bool was_executed_more_than(int n);
422 bool was_never_executed() { return !was_executed_more_than(0); }
423
424 static void build_profiling_method_data(const methodHandle& method, TRAPS);
425
426 static MethodCounters* build_method_counters(Thread* current, Method* m);
427
428 int interpreter_invocation_count() { return invocation_count(); }
429
430 #ifndef PRODUCT
431 int64_t compiled_invocation_count() const { return _compiled_invocation_count;}
432 void set_compiled_invocation_count(int count) { _compiled_invocation_count = (int64_t)count; }
433 #else
434 // for PrintMethodData in a product build
435 int64_t compiled_invocation_count() const { return 0; }
436 #endif // not PRODUCT
437
438 // nmethod/verified compiler entry
439 address verified_code_entry();
440 address verified_inline_code_entry();
441 address verified_inline_ro_code_entry();
442 bool check_code() const; // Not inline to avoid circular ref
443 CompiledMethod* volatile code() const;
444
445 // Locks CompiledMethod_lock if not held.
446 void unlink_code(CompiledMethod *compare);
447 // Locks CompiledMethod_lock if not held.
448 void unlink_code();
449
450 private:
451 // Either called with CompiledMethod_lock held or from constructor.
452 void clear_code();
453
454 public:
455 static void set_code(const methodHandle& mh, CompiledMethod* code);
456 void set_adapter_entry(AdapterHandlerEntry* adapter) {
457 _adapter = adapter;
458 }
459 void set_from_compiled_entry(address entry) {
460 _from_compiled_entry = entry;
461 }
462 void set_from_compiled_inline_ro_entry(address entry) {
463 _from_compiled_inline_ro_entry = entry;
464 }
465 void set_from_compiled_inline_entry(address entry) {
466 _from_compiled_inline_entry = entry;
467 }
468
469 address get_i2c_entry();
470 address get_c2i_entry();
471 address get_c2i_inline_entry();
472 address get_c2i_unverified_entry();
473 address get_c2i_unverified_inline_entry();
474 address get_c2i_no_clinit_check_entry();
475 AdapterHandlerEntry* adapter() const {
476 return _adapter;
477 }
478 // setup entry points
479 void link_method(const methodHandle& method, TRAPS);
480 // clear entry points. Used by sharing code during dump time
481 void unlink_method() NOT_CDS_RETURN;
482
483 // the number of argument reg slots that the compiled method uses on the stack.
484 int num_stack_arg_slots() const { return constMethod()->num_stack_arg_slots(); }
485
486 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
487 virtual MetaspaceObj::Type type() const { return MethodType; }
488
489 // vtable index
490 enum VtableIndexFlag {
491 // Valid vtable indexes are non-negative (>= 0).
492 // These few negative values are used as sentinels.
493 itable_index_max = -10, // first itable index, growing downward
494 pending_itable_index = -9, // itable index will be assigned
495 invalid_vtable_index = -4, // distinct from any valid vtable index
496 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
497 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
498 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
499 };
500 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
501 bool has_vtable_index() const { return _vtable_index >= 0; }
502 int vtable_index() const { return _vtable_index; }
503 void set_vtable_index(int index);
504 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; })
505 bool has_itable_index() const { return _vtable_index <= itable_index_max; }
506 int itable_index() const { assert(valid_itable_index(), "");
507 return itable_index_max - _vtable_index; }
508 void set_itable_index(int index);
509
510 // interpreter entry
511 address interpreter_entry() const { return _i2i_entry; }
512 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
513 void set_interpreter_entry(address entry) {
514 if (_i2i_entry != entry) {
515 _i2i_entry = entry;
516 }
517 if (_from_interpreted_entry != entry) {
518 _from_interpreted_entry = entry;
519 }
520 }
521
522 // native function (used for native methods only)
523 enum {
524 native_bind_event_is_interesting = true
525 };
526 address native_function() const { return *(native_function_addr()); }
527
528 // Must specify a real function (not NULL).
529 // Use clear_native_function() to unregister.
530 void set_native_function(address function, bool post_event_flag);
531 bool has_native_function() const;
532 void clear_native_function();
533
534 // signature handler (used for native methods only)
535 address signature_handler() const { return *(signature_handler_addr()); }
536 void set_signature_handler(address handler);
537
538 // Interpreter oopmap support
539 void mask_for(int bci, InterpreterOopMap* mask);
540
541 // operations on invocation counter
542 void print_invocation_count();
543
544 // byte codes
545 void set_code(address code) { return constMethod()->set_code(code); }
546 address code_base() const { return constMethod()->code_base(); }
547 bool contains(address bcp) const { return constMethod()->contains(bcp); }
548
549 // prints byte codes
550 void print_codes() const { print_codes_on(tty); }
551 void print_codes_on(outputStream* st) const;
552 void print_codes_on(int from, int to, outputStream* st) const;
553
554 // method parameters
555 bool has_method_parameters() const
556 { return constMethod()->has_method_parameters(); }
557 int method_parameters_length() const
558 { return constMethod()->method_parameters_length(); }
559 MethodParametersElement* method_parameters_start() const
560 { return constMethod()->method_parameters_start(); }
561
562 // checked exceptions
563 int checked_exceptions_length() const
564 { return constMethod()->checked_exceptions_length(); }
565 CheckedExceptionElement* checked_exceptions_start() const
566 { return constMethod()->checked_exceptions_start(); }
567
568 // localvariable table
569 bool has_localvariable_table() const
570 { return constMethod()->has_localvariable_table(); }
571 int localvariable_table_length() const
572 { return constMethod()->localvariable_table_length(); }
573 LocalVariableTableElement* localvariable_table_start() const
574 { return constMethod()->localvariable_table_start(); }
575
576 bool has_linenumber_table() const
577 { return constMethod()->has_linenumber_table(); }
578 u_char* compressed_linenumber_table() const
579 { return constMethod()->compressed_linenumber_table(); }
580
581 // method holder (the Klass* holding this method)
582 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
583
584 Symbol* klass_name() const; // returns the name of the method holder
585 BasicType result_type() const { return constMethod()->result_type(); }
586 bool is_returning_oop() const { BasicType r = result_type(); return is_reference_type(r); }
587 InlineKlass* returns_inline_type(Thread* thread) const;
588
589 // Checked exceptions thrown by this method (resolved to mirrors)
590 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
591
592 // Access flags
593 bool is_public() const { return access_flags().is_public(); }
594 bool is_private() const { return access_flags().is_private(); }
595 bool is_protected() const { return access_flags().is_protected(); }
596 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
597 bool is_static() const { return access_flags().is_static(); }
598 bool is_final() const { return access_flags().is_final(); }
599 bool is_synchronized() const { return access_flags().is_synchronized();}
600 bool is_native() const { return access_flags().is_native(); }
601 bool is_abstract() const { return access_flags().is_abstract(); }
602 bool is_synthetic() const { return access_flags().is_synthetic(); }
603
604 // returns true if contains only return operation
605 bool is_empty_method() const;
606
607 // returns true if this is a vanilla constructor
608 bool is_vanilla_constructor() const;
609
610 // checks method and its method holder
611 bool is_final_method() const;
612 bool is_final_method(AccessFlags class_access_flags) const;
613 // interface method declared with 'default' - excludes private interface methods
614 bool is_default_method() const;
615
616 // true if method needs no dynamic dispatch (final and/or no vtable entry)
617 bool can_be_statically_bound() const;
618 bool can_be_statically_bound(InstanceKlass* context) const;
619 bool can_be_statically_bound(AccessFlags class_access_flags) const;
620
621 // true if method can omit stack trace in throw in compiled code.
622 bool can_omit_stack_trace();
623
624 // returns true if the method has any backward branches.
625 bool has_loops() {
626 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
627 };
628
629 bool compute_has_loops_flag();
630
631 bool has_jsrs() {
632 return access_flags().has_jsrs();
633 };
634 void set_has_jsrs() {
635 _access_flags.set_has_jsrs();
636 }
637
638 // returns true if the method has any monitors.
639 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
640 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
641
642 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
643
644 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
645 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
646 // has not been computed yet.
647 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
648 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
649
650 // returns true if the method is an accessor function (setter/getter).
651 bool is_accessor() const;
652
653 // returns true if the method is a getter
654 bool is_getter() const;
655
656 // returns true if the method is a setter
657 bool is_setter() const;
658
659 // returns true if the method does nothing but return a constant of primitive type
660 bool is_constant_getter() const;
661
662 // returns true if the method name is <clinit> and the method has
663 // valid static initializer flags.
664 bool is_class_initializer() const;
665
666 // returns true if the method name is <init> and the method is not a static factory
667 bool is_object_constructor() const;
668
669 // returns true if the method is an object constructor or class initializer
670 // (non-static <init> or <clinit>), but false for factories (static <init>).
671 bool is_object_constructor_or_class_initializer() const;
672
673 // returns true if the method name is <init> and the method is static
674 bool is_static_init_factory() const;
675
676 // compiled code support
677 // NOTE: code() is inherently racy as deopt can be clearing code
678 // simultaneously. Use with caution.
679 bool has_compiled_code() const;
680
681 bool needs_clinit_barrier() const;
682
683 // sizing
684 static int header_size() {
685 return align_up((int)sizeof(Method), wordSize) / wordSize;
686 }
687 static int size(bool is_native);
688 int size() const { return method_size(); }
689 void log_touched(Thread* current);
690 static void print_touched_methods(outputStream* out);
691
692 // interpreter support
693 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
694 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
695 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
696 static ByteSize from_compiled_inline_offset() { return byte_offset_of(Method, _from_compiled_inline_entry); }
697 static ByteSize from_compiled_inline_ro_offset(){ return byte_offset_of(Method, _from_compiled_inline_ro_entry); }
698 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
699 static ByteSize flags_offset() { return byte_offset_of(Method, _flags); }
700 static ByteSize method_data_offset() {
701 return byte_offset_of(Method, _method_data);
702 }
703 static ByteSize method_counters_offset() {
704 return byte_offset_of(Method, _method_counters);
705 }
706 #ifndef PRODUCT
707 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
708 #endif // not PRODUCT
709 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
710 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
711 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
712 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
713 static ByteSize itable_index_offset() { return byte_offset_of(Method, _vtable_index ); }
714
715 // for code generation
716 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
717 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
718 static int intrinsic_id_size_in_bytes() { return sizeof(u2); }
719
720 // Static methods that are used to implement member methods where an exposed this pointer
721 // is needed due to possible GCs
722 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
723
724 // Returns the byte code index from the byte code pointer
725 int bci_from(address bcp) const;
726 address bcp_from(int bci) const;
727 address bcp_from(address bcp) const;
728 int validate_bci_from_bcp(address bcp) const;
729 int validate_bci(int bci) const;
730
731 // Returns the line number for a bci if debugging information for the method is prowided,
732 // -1 is returned otherwise.
733 int line_number_from_bci(int bci) const;
734
735 // Reflection support
736 bool is_overridden_in(Klass* k) const;
737
738 // Stack walking support
739 bool is_ignored_by_security_stack_walk() const;
740
741 // JSR 292 support
742 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
743 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
744 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
745 static methodHandle make_method_handle_intrinsic(vmIntrinsicID iid, // _invokeBasic, _linkToVirtual
746 Symbol* signature, //anything at all
747 TRAPS);
748
749
750 // Continuation
751 inline bool is_continuation_enter_intrinsic() const;
752 inline bool is_continuation_yield_intrinsic() const;
753 inline bool is_continuation_native_intrinsic() const;
754 inline bool is_special_native_intrinsic() const;
755
756 static Klass* check_non_bcp_klass(Klass* klass);
757
758 enum {
759 // How many extra stack entries for invokedynamic
760 extra_stack_entries_for_jsr292 = 1
761 };
762
763 // this operates only on invoke methods:
764 // presize interpreter frames for extra interpreter stack entries, if needed
765 // Account for the extra appendix argument for invokehandle/invokedynamic
766 static int extra_stack_entries() { return extra_stack_entries_for_jsr292; }
767 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize
768
769 // RedefineClasses() support:
770 bool is_old() const { return access_flags().is_old(); }
771 void set_is_old() { _access_flags.set_is_old(); }
772 bool is_obsolete() const { return access_flags().is_obsolete(); }
773 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
774 bool is_deleted() const { return access_flags().is_deleted(); }
775 void set_is_deleted() { _access_flags.set_is_deleted(); }
776
777 bool on_stack() const { return access_flags().on_stack(); }
778 void set_on_stack(const bool value);
779
780 void record_gc_epoch();
781
782 // see the definition in Method*.cpp for the gory details
783 bool should_not_be_cached() const;
784
785 // JVMTI Native method prefixing support:
786 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
787 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
788
789 // Rewriting support
790 static methodHandle clone_with_new_data(const methodHandle& m, u_char* new_code, int new_code_length,
791 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
792
793 // jmethodID handling
794 // Because the useful life-span of a jmethodID cannot be determined,
795 // once created they are never reclaimed. The methods to which they refer,
796 // however, can be GC'ed away if the class is unloaded or if the method is
797 // made obsolete or deleted -- in these cases, the jmethodID
798 // refers to NULL (as is the case for any weak reference).
799 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
800 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
801
802 // Ensure there is enough capacity in the internal tracking data
803 // structures to hold the number of jmethodIDs you plan to generate.
804 // This saves substantial time doing allocations.
805 static void ensure_jmethod_ids(ClassLoaderData* loader_data, int capacity);
806
807 // Use resolve_jmethod_id() in situations where the caller is expected
808 // to provide a valid jmethodID; the only sanity checks are in asserts;
809 // result guaranteed not to be NULL.
810 inline static Method* resolve_jmethod_id(jmethodID mid) {
811 assert(mid != NULL, "JNI method id should not be null");
812 return *((Method**)mid);
813 }
814
815 // Use checked_resolve_jmethod_id() in situations where the caller
816 // should provide a valid jmethodID, but might not. NULL is returned
817 // when the jmethodID does not refer to a valid method.
818 static Method* checked_resolve_jmethod_id(jmethodID mid);
819
820 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
821 static bool is_method_id(jmethodID mid);
822
823 // Clear methods
824 static void clear_jmethod_ids(ClassLoaderData* loader_data);
825 static void print_jmethod_ids_count(const ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
826
827 // Get this method's jmethodID -- allocate if it doesn't exist
828 jmethodID jmethod_id();
829
830 // Lookup the jmethodID for this method. Return NULL if not found.
831 // NOTE that this function can be called from a signal handler
832 // (see AsyncGetCallTrace support for Forte Analyzer) and this
833 // needs to be async-safe. No allocation should be done and
834 // so handles are not used to avoid deadlock.
835 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
836
837 // Support for inlining of intrinsic methods
838 vmIntrinsicID intrinsic_id() const { return (vmIntrinsicID) _intrinsic_id; }
839 void set_intrinsic_id(vmIntrinsicID id) { _intrinsic_id = (u2) id; }
840
841 // Helper routines for intrinsic_id() and vmIntrinsics::method().
842 void init_intrinsic_id(vmSymbolID klass_id); // updates from _none if a match
843 static vmSymbolID klass_id_for_intrinsics(const Klass* holder);
844
845 bool caller_sensitive() {
846 return (_flags & _caller_sensitive) != 0;
847 }
848 void set_caller_sensitive(bool x) {
849 _flags = x ? (_flags | _caller_sensitive) : (_flags & ~_caller_sensitive);
850 }
851
852 bool force_inline() {
853 return (_flags & _force_inline) != 0;
854 }
855 void set_force_inline(bool x) {
856 _flags = x ? (_flags | _force_inline) : (_flags & ~_force_inline);
857 }
858
859 bool dont_inline() {
860 return (_flags & _dont_inline) != 0;
861 }
862 void set_dont_inline(bool x) {
863 _flags = x ? (_flags | _dont_inline) : (_flags & ~_dont_inline);
864 }
865
866 bool changes_current_thread() {
867 return (_flags & _changes_current_thread) != 0;
868 }
869 void set_changes_current_thread(bool x) {
870 _flags = x ? (_flags | _changes_current_thread) : (_flags & ~_changes_current_thread);
871 }
872
873 bool jvmti_mount_transition() {
874 return (_flags & _jvmti_mount_transition) != 0;
875 }
876 void set_jvmti_mount_transition(bool x) {
877 _flags = x ? (_flags | _jvmti_mount_transition) : (_flags & ~_jvmti_mount_transition);
878 }
879
880 bool is_hidden() const {
881 return (_flags & _hidden) != 0;
882 }
883
884 void set_hidden(bool x) {
885 _flags = x ? (_flags | _hidden) : (_flags & ~_hidden);
886 }
887
888 bool is_scoped() const {
889 return (_flags & _scoped) != 0;
890 }
891
892 void set_scoped(bool x) {
893 _flags = x ? (_flags | _scoped) : (_flags & ~_scoped);
894 }
895
896 bool intrinsic_candidate() {
897 return (_flags & _intrinsic_candidate) != 0;
898 }
899 void set_intrinsic_candidate(bool x) {
900 _flags = x ? (_flags | _intrinsic_candidate) : (_flags & ~_intrinsic_candidate);
901 }
902
903 bool has_injected_profile() {
904 return (_flags & _has_injected_profile) != 0;
905 }
906 void set_has_injected_profile(bool x) {
907 _flags = x ? (_flags | _has_injected_profile) : (_flags & ~_has_injected_profile);
908 }
909
910 bool has_reserved_stack_access() {
911 return (_flags & _reserved_stack_access) != 0;
912 }
913
914 void set_has_reserved_stack_access(bool x) {
915 _flags = x ? (_flags | _reserved_stack_access) : (_flags & ~_reserved_stack_access);
916 }
917
918 bool has_scalarized_args() const {
919 return (_flags & _scalarized_args) != 0;
920 }
921
922 void set_has_scalarized_args(bool x) {
923 _flags = x ? (_flags | _scalarized_args) : (_flags & ~_scalarized_args);
924 }
925
926 bool has_scalarized_return() const {
927 return (_flags & _scalarized_return) != 0;
928 }
929
930 void set_has_scalarized_return(bool x) {
931 _flags = x ? (_flags | _scalarized_return) : (_flags & ~_scalarized_return);
932 }
933
934 bool is_scalarized_arg(int idx) const;
935
936 bool c1_needs_stack_repair() {
937 return (_flags & _c1_needs_stack_repair) != 0;
938 }
939
940 bool c2_needs_stack_repair() {
941 return (_flags & _c2_needs_stack_repair) != 0;
942 }
943
944 void set_c1_needs_stack_repair(bool x) {
945 _flags = x ? (_flags | _c1_needs_stack_repair) : (_flags & ~_c1_needs_stack_repair);
946 }
947
948 void set_c2_needs_stack_repair(bool x) {
949 _flags = x ? (_flags | _c2_needs_stack_repair) : (_flags & ~_c2_needs_stack_repair);
950 }
951
952 JFR_ONLY(DEFINE_TRACE_FLAG_ACCESSOR;)
953
954 ConstMethod::MethodType method_type() const {
955 return _constMethod->method_type();
956 }
957 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
958
959 // On-stack replacement support
960 bool has_osr_nmethod(int level, bool match_level) {
961 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
962 }
963
964 int mark_osr_nmethods() {
965 return method_holder()->mark_osr_nmethods(this);
966 }
967
968 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
969 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
970 }
971
972 // Find if klass for method is loaded
973 bool is_klass_loaded_by_klass_index(int klass_index) const;
974 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
975
976 // Indicates whether compilation failed earlier for this method, or
977 // whether it is not compilable for another reason like having a
978 // breakpoint set in it.
979 bool is_not_compilable(int comp_level = CompLevel_any) const;
980 void set_not_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
981 void set_not_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
982 set_not_compilable(reason, comp_level, false);
983 }
984 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
985 void set_not_osr_compilable(const char* reason, int comp_level = CompLevel_all, bool report = true);
986 void set_not_osr_compilable_quietly(const char* reason, int comp_level = CompLevel_all) {
987 set_not_osr_compilable(reason, comp_level, false);
988 }
989 bool is_always_compilable() const;
990
991 private:
992 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
993
994 public:
995 MethodCounters* get_method_counters(Thread* current) {
996 if (_method_counters == NULL) {
997 build_method_counters(current, this);
998 }
999 return _method_counters;
1000 }
1001
1002 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
1003 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
1004 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); }
1005 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
1006 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
1007 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); }
1008
1009 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit
1010 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit
1011 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit
1012 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); }
1013 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); }
1014 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); }
1015
1016 // Background compilation support
1017 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
1018 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
1019 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
1020
1021 // Resolve all classes in signature, return 'true' if successful
1022 static bool load_signature_classes(const methodHandle& m, TRAPS);
1023
1024 // Return if true if not all classes references in signature, including return type, has been loaded
1025 static bool has_unloaded_classes_in_signature(const methodHandle& m, TRAPS);
1026
1027 // Printing
1028 void print_short_name(outputStream* st = tty) const; // prints as klassname::methodname; Exposed so field engineers can debug VM
1029 #if INCLUDE_JVMTI
1030 void print_name(outputStream* st = tty) const; // prints as "virtual void foo(int)"; exposed for -Xlog:redefine+class
1031 #else
1032 void print_name(outputStream* st = tty) const PRODUCT_RETURN; // prints as "virtual void foo(int)"
1033 #endif
1034
1035 typedef int (*method_comparator_func)(Method* a, Method* b);
1036
1037 // Helper routine used for method sorting
1038 static void sort_methods(Array<Method*>* methods, bool set_idnums = true, method_comparator_func func = NULL);
1039
1040 // Deallocation function for redefine classes or if an error occurs
1041 void deallocate_contents(ClassLoaderData* loader_data);
1042
1043 void release_C_heap_structures();
1044
1045 Method* get_new_method() const {
1046 InstanceKlass* holder = method_holder();
1047 Method* new_method = holder->method_with_idnum(orig_method_idnum());
1048
1049 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1050 assert(this != new_method, "sanity check");
1051 return new_method;
1052 }
1053
1054 // Printing
1055 #ifndef PRODUCT
1056 void print_on(outputStream* st) const;
1057 #endif
1058 void print_value_on(outputStream* st) const;
1059 void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1060
1061 const char* internal_name() const { return "{method}"; }
1062
1063 // Check for valid method pointer
1064 static bool has_method_vptr(const void* ptr);
1065 static bool is_valid_method(const Method* m);
1066
1067 // Verify
1068 void verify() { verify_on(tty); }
1069 void verify_on(outputStream* st);
1070
1071 private:
1072
1073 // Inlined elements
1074 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
1075 address* signature_handler_addr() const { return native_function_addr() + 1; }
1076
1077 void set_num_stack_arg_slots(int n) { constMethod()->set_num_stack_arg_slots(n); }
1078 };
1079
1080
1081 // Utility class for compressing line number tables
1082
1083 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1084 private:
1085 int _bci;
1086 int _line;
1087 public:
1088 // Constructor
1089 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1090 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1091
1092 // Write (bci, line number) pair to stream
1093 void write_pair_regular(int bci_delta, int line_delta);
1094
1095 // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1096 // we save it as one byte, otherwise we write a 0xFF escape character
1097 // and use regular compression. 0x0 is used as end-of-stream terminator.
1098 void write_pair_inline(int bci, int line);
1099
1100 void write_pair(int bci, int line);
1101
1102 // Write end-of-stream marker
1103 void write_terminator() { write_byte(0); }
1104 };
1105
1106
1107 // Utility class for decompressing line number tables
1108
1109 class CompressedLineNumberReadStream: public CompressedReadStream {
1110 private:
1111 int _bci;
1112 int _line;
1113 public:
1114 // Constructor
1115 CompressedLineNumberReadStream(u_char* buffer);
1116 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1117 bool read_pair();
1118 // Accessing bci and line number (after calling read_pair)
1119 int bci() const { return _bci; }
1120 int line() const { return _line; }
1121 };
1122
1123
1124 #if INCLUDE_JVMTI
1125
1126 /// Fast Breakpoints.
1127
1128 // If this structure gets more complicated (because bpts get numerous),
1129 // move it into its own header.
1130
1131 // There is presently no provision for concurrent access
1132 // to breakpoint lists, which is only OK for JVMTI because
1133 // breakpoints are written only at safepoints, and are read
1134 // concurrently only outside of safepoints.
1135
1136 class BreakpointInfo : public CHeapObj<mtClass> {
1137 friend class VMStructs;
1138 private:
1139 Bytecodes::Code _orig_bytecode;
1140 int _bci;
1141 u2 _name_index; // of method
1142 u2 _signature_index; // of method
1143 BreakpointInfo* _next; // simple storage allocation
1144
1145 public:
1146 BreakpointInfo(Method* m, int bci);
1147
1148 // accessors
1149 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
1150 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1151 int bci() { return _bci; }
1152
1153 BreakpointInfo* next() const { return _next; }
1154 void set_next(BreakpointInfo* n) { _next = n; }
1155
1156 // helps for searchers
1157 bool match(const Method* m, int bci) {
1158 return bci == _bci && match(m);
1159 }
1160
1161 bool match(const Method* m) {
1162 return _name_index == m->name_index() &&
1163 _signature_index == m->signature_index();
1164 }
1165
1166 void set(Method* method);
1167 void clear(Method* method);
1168 };
1169
1170 #endif // INCLUDE_JVMTI
1171
1172 // Utility class for access exception handlers
1173 class ExceptionTable : public StackObj {
1174 private:
1175 ExceptionTableElement* _table;
1176 u2 _length;
1177
1178 public:
1179 ExceptionTable(const Method* m) {
1180 if (m->has_exception_handler()) {
1181 _table = m->exception_table_start();
1182 _length = m->exception_table_length();
1183 } else {
1184 _table = NULL;
1185 _length = 0;
1186 }
1187 }
1188
1189 int length() const {
1190 return _length;
1191 }
1192
1193 u2 start_pc(int idx) const {
1194 assert(idx < _length, "out of bounds");
1195 return _table[idx].start_pc;
1196 }
1197
1198 void set_start_pc(int idx, u2 value) {
1199 assert(idx < _length, "out of bounds");
1200 _table[idx].start_pc = value;
1201 }
1202
1203 u2 end_pc(int idx) const {
1204 assert(idx < _length, "out of bounds");
1205 return _table[idx].end_pc;
1206 }
1207
1208 void set_end_pc(int idx, u2 value) {
1209 assert(idx < _length, "out of bounds");
1210 _table[idx].end_pc = value;
1211 }
1212
1213 u2 handler_pc(int idx) const {
1214 assert(idx < _length, "out of bounds");
1215 return _table[idx].handler_pc;
1216 }
1217
1218 void set_handler_pc(int idx, u2 value) {
1219 assert(idx < _length, "out of bounds");
1220 _table[idx].handler_pc = value;
1221 }
1222
1223 u2 catch_type_index(int idx) const {
1224 assert(idx < _length, "out of bounds");
1225 return _table[idx].catch_type_index;
1226 }
1227
1228 void set_catch_type_index(int idx, u2 value) {
1229 assert(idx < _length, "out of bounds");
1230 _table[idx].catch_type_index = value;
1231 }
1232 };
1233
1234 #endif // SHARE_OOPS_METHOD_HPP