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_interpreted_entry() const;
159
160 // access flag
161 AccessFlags access_flags() const { return _access_flags; }
162 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
163
164 // name
165 Symbol* name() const { return constants()->symbol_at(name_index()); }
166 int name_index() const { return constMethod()->name_index(); }
167 void set_name_index(int index) { constMethod()->set_name_index(index); }
168
169 // signature
170 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
171 int signature_index() const { return constMethod()->signature_index(); }
172 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
173
174 // generics support
175 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
176 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
177 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
178
179 // annotations support
180 AnnotationArray* annotations() const {
181 return constMethod()->method_annotations();
182 }
183 AnnotationArray* parameter_annotations() const {
184 return constMethod()->parameter_annotations();
185 }
186 AnnotationArray* annotation_default() const {
187 return constMethod()->default_annotations();
188 }
189 AnnotationArray* type_annotations() const {
190 return constMethod()->type_annotations();
191 }
192
193 // Helper routine: get klass name + "." + method name + signature as
194 // C string, for the purpose of providing more useful
195 // fatal error handling. The string is allocated in resource
196 // area if a buffer is not provided by the caller.
197 char* name_and_sig_as_C_string() const;
198 char* name_and_sig_as_C_string(char* buf, int size) const;
199
200 // Static routine in the situations we don't have a Method*
201 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
202 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
203
204 // Get return type + klass name + "." + method name + ( parameters types )
205 // as a C string or print it to an outputStream.
206 // This is to be used to assemble strings passed to Java, so that
207 // the text more resembles Java code. Used in exception messages.
208 // Memory is allocated in the resource area; the caller needs
209 // a ResourceMark.
210 const char* external_name() const;
211 void print_external_name(outputStream *os) const;
212
213 static const char* external_name( Klass* klass, Symbol* method_name, Symbol* signature);
214 static void print_external_name(outputStream *os, Klass* klass, Symbol* method_name, Symbol* signature);
215
216 Bytecodes::Code java_code_at(int bci) const {
217 return Bytecodes::java_code_at(this, bcp_from(bci));
218 }
219 Bytecodes::Code code_at(int bci) const {
220 return Bytecodes::code_at(this, bcp_from(bci));
221 }
222
223 // JVMTI breakpoints
224 #if !INCLUDE_JVMTI
225 Bytecodes::Code orig_bytecode_at(int bci) const {
226 ShouldNotReachHere();
227 return Bytecodes::_shouldnotreachhere;
228 }
229 void set_orig_bytecode_at(int bci, Bytecodes::Code code) {
230 ShouldNotReachHere();
231 };
232 u2 number_of_breakpoints() const {return 0;}
233 #else // !INCLUDE_JVMTI
234 Bytecodes::Code orig_bytecode_at(int bci) const;
235 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
236 void set_breakpoint(int bci);
237 void clear_breakpoint(int bci);
238 void clear_all_breakpoints();
239 // Tracking number of breakpoints, for fullspeed debugging.
240 // Only mutated by VM thread.
241 u2 number_of_breakpoints() const {
242 MethodCounters* mcs = method_counters();
243 if (mcs == NULL) {
244 return 0;
245 } else {
246 return mcs->number_of_breakpoints();
247 }
248 }
249 void incr_number_of_breakpoints(Thread* current) {
250 MethodCounters* mcs = get_method_counters(current);
251 if (mcs != NULL) {
252 mcs->incr_number_of_breakpoints();
253 }
254 }
255 void decr_number_of_breakpoints(Thread* current) {
256 MethodCounters* mcs = get_method_counters(current);
257 if (mcs != NULL) {
258 mcs->decr_number_of_breakpoints();
259 }
260 }
261 // Initialization only
262 void clear_number_of_breakpoints() {
263 MethodCounters* mcs = method_counters();
264 if (mcs != NULL) {
265 mcs->clear_number_of_breakpoints();
266 }
267 }
268 #endif // !INCLUDE_JVMTI
269
270 // index into InstanceKlass methods() array
271 // note: also used by jfr
272 u2 method_idnum() const { return constMethod()->method_idnum(); }
273 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
274
275 u2 orig_method_idnum() const { return constMethod()->orig_method_idnum(); }
276 void set_orig_method_idnum(u2 idnum) { constMethod()->set_orig_method_idnum(idnum); }
277
278 // code size
279 int code_size() const { return constMethod()->code_size(); }
280
281 // method size in words
282 int method_size() const { return sizeof(Method)/wordSize + ( is_native() ? 2 : 0 ); }
283
284 // constant pool for Klass* holding this method
285 ConstantPool* constants() const { return constMethod()->constants(); }
286 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
287
288 // max stack
289 // return original max stack size for method verification
290 int verifier_max_stack() const { return constMethod()->max_stack(); }
291 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
292 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
293
294 // max locals
295 int max_locals() const { return constMethod()->max_locals(); }
296 void set_max_locals(int size) { constMethod()->set_max_locals(size); }
297
298 int highest_comp_level() const;
299 void set_highest_comp_level(int level);
300 int highest_osr_comp_level() const;
301 void set_highest_osr_comp_level(int level);
302
303 #if COMPILER2_OR_JVMCI
304 // Count of times method was exited via exception while interpreting
305 void interpreter_throwout_increment(Thread* current) {
306 MethodCounters* mcs = get_method_counters(current);
307 if (mcs != NULL) {
308 mcs->interpreter_throwout_increment();
309 }
310 }
311 #endif
312
313 int interpreter_throwout_count() const {
314 MethodCounters* mcs = method_counters();
315 if (mcs == NULL) {
316 return 0;
317 } else {
318 return mcs->interpreter_throwout_count();
319 }
320 }
321
322 // Derive stuff from the signature at load time.
323 void compute_from_signature(Symbol* sig);
324
325 // size of parameters (receiver if any + arguments)
326 int size_of_parameters() const { return constMethod()->size_of_parameters(); }
327 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); }
328
329 bool has_stackmap_table() const {
330 return constMethod()->has_stackmap_table();
331 }
332
333 Array<u1>* stackmap_data() const {
334 return constMethod()->stackmap_data();
335 }
336
337 void set_stackmap_data(Array<u1>* sd) {
338 constMethod()->set_stackmap_data(sd);
339 }
340
341 // exception handler table
342 bool has_exception_handler() const
343 { return constMethod()->has_exception_handler(); }
344 int exception_table_length() const
345 { return constMethod()->exception_table_length(); }
346 ExceptionTableElement* exception_table_start() const
347 { return constMethod()->exception_table_start(); }
348
349 // Finds the first entry point bci of an exception handler for an
350 // exception of klass ex_klass thrown at throw_bci. A value of NULL
351 // for ex_klass indicates that the exception klass is not known; in
352 // this case it matches any constraint class. Returns -1 if the
353 // exception cannot be handled in this method. The handler
354 // constraint classes are loaded if necessary. Note that this may
355 // throw an exception if loading of the constraint classes causes
356 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
357 // If an exception is thrown, returns the bci of the
358 // exception handler which caused the exception to be thrown, which
359 // is needed for proper retries. See, for example,
360 // InterpreterRuntime::exception_handler_for_exception.
361 static int fast_exception_handler_bci_for(const methodHandle& mh, Klass* ex_klass, int throw_bci, TRAPS);
362
363 static bool register_native(Klass* k,
364 Symbol* name,
365 Symbol* signature,
366 address entry,
367 TRAPS);
368
369 // method data access
370 MethodData* method_data() const {
371 return _method_data;
372 }
373
374 void set_method_data(MethodData* data);
375
376 MethodCounters* method_counters() const {
377 return _method_counters;
378 }
379
380 void clear_method_counters() {
381 _method_counters = NULL;
382 }
383
384 bool init_method_counters(MethodCounters* counters);
385
386 int prev_event_count() const {
387 MethodCounters* mcs = method_counters();
388 return mcs == NULL ? 0 : mcs->prev_event_count();
389 }
390 void set_prev_event_count(int count) {
391 MethodCounters* mcs = method_counters();
392 if (mcs != NULL) {
393 mcs->set_prev_event_count(count);
394 }
395 }
396 jlong prev_time() const {
397 MethodCounters* mcs = method_counters();
398 return mcs == NULL ? 0 : mcs->prev_time();
399 }
400 void set_prev_time(jlong time) {
401 MethodCounters* mcs = method_counters();
402 if (mcs != NULL) {
403 mcs->set_prev_time(time);
404 }
405 }
406 float rate() const {
407 MethodCounters* mcs = method_counters();
408 return mcs == NULL ? 0 : mcs->rate();
409 }
410 void set_rate(float rate) {
411 MethodCounters* mcs = method_counters();
412 if (mcs != NULL) {
413 mcs->set_rate(rate);
414 }
415 }
416
417 int invocation_count() const;
418 int backedge_count() const;
419
420 bool was_executed_more_than(int n);
421 bool was_never_executed() { return !was_executed_more_than(0); }
422
423 static void build_profiling_method_data(const methodHandle& method, TRAPS);
424
425 static MethodCounters* build_method_counters(Thread* current, Method* m);
426
427 int interpreter_invocation_count() { return invocation_count(); }
428
429 #ifndef PRODUCT
430 int64_t compiled_invocation_count() const { return _compiled_invocation_count;}
431 void set_compiled_invocation_count(int count) { _compiled_invocation_count = (int64_t)count; }
432 #else
433 // for PrintMethodData in a product build
434 int64_t compiled_invocation_count() const { return 0; }
435 #endif // not PRODUCT
436
437 // nmethod/verified compiler entry
438 address verified_code_entry();
439 address verified_inline_code_entry();
440 address verified_inline_ro_code_entry();
441 bool check_code() const; // Not inline to avoid circular ref
442 CompiledMethod* volatile code() const;
443
444 // Locks CompiledMethod_lock if not held.
445 void unlink_code(CompiledMethod *compare);
446 // Locks CompiledMethod_lock if not held.
447 void unlink_code();
448
449 private:
450 // Either called with CompiledMethod_lock held or from constructor.
451 void clear_code();
452
453 public:
454 static void set_code(const methodHandle& mh, CompiledMethod* code);
455 void set_adapter_entry(AdapterHandlerEntry* adapter) {
456 _adapter = adapter;
457 }
458 void set_from_compiled_entry(address entry) {
459 _from_compiled_entry = entry;
460 }
461 void set_from_compiled_inline_ro_entry(address entry) {
462 _from_compiled_inline_ro_entry = entry;
463 }
464 void set_from_compiled_inline_entry(address entry) {
465 _from_compiled_inline_entry = entry;
466 }
467
468 address get_i2c_entry();
469 address get_c2i_entry();
470 address get_c2i_inline_entry();
471 address get_c2i_unverified_entry();
472 address get_c2i_unverified_inline_entry();
473 address get_c2i_no_clinit_check_entry();
474 AdapterHandlerEntry* adapter() const {
475 return _adapter;
476 }
477 // setup entry points
478 void link_method(const methodHandle& method, TRAPS);
479 // clear entry points. Used by sharing code during dump time
480 void unlink_method() NOT_CDS_RETURN;
481
482 // the number of argument reg slots that the compiled method uses on the stack.
483 int num_stack_arg_slots() const { return constMethod()->num_stack_arg_slots(); }
484
485 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
486 virtual MetaspaceObj::Type type() const { return MethodType; }
487
488 // vtable index
489 enum VtableIndexFlag {
490 // Valid vtable indexes are non-negative (>= 0).
491 // These few negative values are used as sentinels.
492 itable_index_max = -10, // first itable index, growing downward
493 pending_itable_index = -9, // itable index will be assigned
494 invalid_vtable_index = -4, // distinct from any valid vtable index
495 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
496 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
497 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
498 };
499 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
500 bool has_vtable_index() const { return _vtable_index >= 0; }
501 int vtable_index() const { return _vtable_index; }
502 void set_vtable_index(int index);
503 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; })
504 bool has_itable_index() const { return _vtable_index <= itable_index_max; }
505 int itable_index() const { assert(valid_itable_index(), "");
506 return itable_index_max - _vtable_index; }
507 void set_itable_index(int index);
508
509 // interpreter entry
510 address interpreter_entry() const { return _i2i_entry; }
511 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
512 void set_interpreter_entry(address entry) {
513 if (_i2i_entry != entry) {
514 _i2i_entry = entry;
515 }
516 if (_from_interpreted_entry != entry) {
517 _from_interpreted_entry = entry;
518 }
519 }
520
521 // native function (used for native methods only)
522 enum {
523 native_bind_event_is_interesting = true
524 };
525 address native_function() const { return *(native_function_addr()); }
526
527 // Must specify a real function (not NULL).
528 // Use clear_native_function() to unregister.
529 void set_native_function(address function, bool post_event_flag);
530 bool has_native_function() const;
531 void clear_native_function();
532
533 // signature handler (used for native methods only)
534 address signature_handler() const { return *(signature_handler_addr()); }
535 void set_signature_handler(address handler);
536
537 // Interpreter oopmap support
538 void mask_for(int bci, InterpreterOopMap* mask);
539
540 // operations on invocation counter
541 void print_invocation_count();
542
543 // byte codes
544 void set_code(address code) { return constMethod()->set_code(code); }
545 address code_base() const { return constMethod()->code_base(); }
546 bool contains(address bcp) const { return constMethod()->contains(bcp); }
547
548 // prints byte codes
549 void print_codes(int flags = 0) const { print_codes_on(tty, flags); }
550 void print_codes_on(outputStream* st, int flags = 0) const;
551 void print_codes_on(int from, int to, outputStream* st, int flags = 0) const;
552
553 // method parameters
554 bool has_method_parameters() const
555 { return constMethod()->has_method_parameters(); }
556 int method_parameters_length() const
557 { return constMethod()->method_parameters_length(); }
558 MethodParametersElement* method_parameters_start() const
559 { return constMethod()->method_parameters_start(); }
560
561 // checked exceptions
562 int checked_exceptions_length() const
563 { return constMethod()->checked_exceptions_length(); }
564 CheckedExceptionElement* checked_exceptions_start() const
565 { return constMethod()->checked_exceptions_start(); }
566
567 // localvariable table
568 bool has_localvariable_table() const
569 { return constMethod()->has_localvariable_table(); }
570 int localvariable_table_length() const
571 { return constMethod()->localvariable_table_length(); }
572 LocalVariableTableElement* localvariable_table_start() const
573 { return constMethod()->localvariable_table_start(); }
574
575 bool has_linenumber_table() const
576 { return constMethod()->has_linenumber_table(); }
577 u_char* compressed_linenumber_table() const
578 { return constMethod()->compressed_linenumber_table(); }
579
580 // method holder (the Klass* holding this method)
581 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
582
583 Symbol* klass_name() const; // returns the name of the method holder
584 BasicType result_type() const { return constMethod()->result_type(); }
585 bool is_returning_oop() const { BasicType r = result_type(); return is_reference_type(r); }
586 InlineKlass* returns_inline_type(Thread* thread) const;
587
588 // Checked exceptions thrown by this method (resolved to mirrors)
589 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
590
591 // Access flags
592 bool is_public() const { return access_flags().is_public(); }
593 bool is_private() const { return access_flags().is_private(); }
594 bool is_protected() const { return access_flags().is_protected(); }
595 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
596 bool is_static() const { return access_flags().is_static(); }
597 bool is_final() const { return access_flags().is_final(); }
598 bool is_synchronized() const { return access_flags().is_synchronized();}
599 bool is_native() const { return access_flags().is_native(); }
600 bool is_abstract() const { return access_flags().is_abstract(); }
601 bool is_synthetic() const { return access_flags().is_synthetic(); }
602
603 // returns true if contains only return operation
604 bool is_empty_method() const;
605
606 // returns true if this is a vanilla constructor
607 bool is_vanilla_constructor() const;
608
609 // checks method and its method holder
610 bool is_final_method() const;
611 bool is_final_method(AccessFlags class_access_flags) const;
612 // interface method declared with 'default' - excludes private interface methods
613 bool is_default_method() const;
614
615 // true if method needs no dynamic dispatch (final and/or no vtable entry)
616 bool can_be_statically_bound() const;
617 bool can_be_statically_bound(InstanceKlass* context) const;
618 bool can_be_statically_bound(AccessFlags class_access_flags) const;
619
620 // true if method can omit stack trace in throw in compiled code.
621 bool can_omit_stack_trace();
622
623 // returns true if the method has any backward branches.
624 bool has_loops() {
625 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
626 };
627
628 bool compute_has_loops_flag();
629
630 bool has_jsrs() {
631 return access_flags().has_jsrs();
632 };
633 void set_has_jsrs() {
634 _access_flags.set_has_jsrs();
635 }
636
637 // returns true if the method has any monitors.
638 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
639 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
640
641 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
642
643 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
644 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
645 // has not been computed yet.
646 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
647 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
648
649 // returns true if the method is an accessor function (setter/getter).
650 bool is_accessor() const;
651
652 // returns true if the method is a getter
653 bool is_getter() const;
654
655 // returns true if the method is a setter
656 bool is_setter() const;
657
658 // returns true if the method does nothing but return a constant of primitive type
659 bool is_constant_getter() const;
660
661 // returns true if the method name is <clinit> and the method has
662 // valid static initializer flags.
663 bool is_class_initializer() const;
664
665 // returns true if the method name is <init> and the method is not a static factory
666 bool is_object_constructor() const;
667
668 // returns true if the method is an object constructor or class initializer
669 // (non-static <init> or <clinit>), but false for factories (static <vnew>).
670 bool is_object_constructor_or_class_initializer() const;
671
672 // returns true if the method name is <vnew> and the method is static
673 bool is_static_vnew_factory() const;
674
675 // compiled code support
676 // NOTE: code() is inherently racy as deopt can be clearing code
677 // simultaneously. Use with caution.
678 bool has_compiled_code() const;
679
680 bool needs_clinit_barrier() const;
681
682 // sizing
683 static int header_size() {
684 return align_up((int)sizeof(Method), wordSize) / wordSize;
685 }
686 static int size(bool is_native);
687 int size() const { return method_size(); }
688 void log_touched(Thread* current);
689 static void print_touched_methods(outputStream* out);
690
691 // interpreter support
692 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
693 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
694 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
695 static ByteSize from_compiled_inline_offset() { return byte_offset_of(Method, _from_compiled_inline_entry); }
696 static ByteSize from_compiled_inline_ro_offset(){ return byte_offset_of(Method, _from_compiled_inline_ro_entry); }
697 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
698 static ByteSize flags_offset() { return byte_offset_of(Method, _flags); }
699 static ByteSize method_data_offset() {
700 return byte_offset_of(Method, _method_data);
701 }
702 static ByteSize method_counters_offset() {
703 return byte_offset_of(Method, _method_counters);
704 }
705 #ifndef PRODUCT
706 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
707 #endif // not PRODUCT
708 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
709 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
710 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
711 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
712 static ByteSize itable_index_offset() { return byte_offset_of(Method, _vtable_index ); }
713
714 // for code generation
715 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
716 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
717 static int intrinsic_id_size_in_bytes() { return sizeof(u2); }
718
719 // Static methods that are used to implement member methods where an exposed this pointer
720 // is needed due to possible GCs
721 static objArrayHandle resolved_checked_exceptions_impl(Method* method, TRAPS);
722
723 // Returns the byte code index from the byte code pointer
724 int bci_from(address bcp) const;
725 address bcp_from(int bci) const;
726 address bcp_from(address bcp) const;
727 int validate_bci_from_bcp(address bcp) const;
728 int validate_bci(int bci) const;
729
730 // Returns the line number for a bci if debugging information for the method is prowided,
731 // -1 is returned otherwise.
732 int line_number_from_bci(int bci) const;
733
734 // Reflection support
735 bool is_overridden_in(Klass* k) const;
736
737 // Stack walking support
738 bool is_ignored_by_security_stack_walk() const;
739
740 // JSR 292 support
741 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
742 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
743 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
744 static methodHandle make_method_handle_intrinsic(vmIntrinsicID iid, // _invokeBasic, _linkToVirtual
745 Symbol* signature, //anything at all
746 TRAPS);
747 // Some special methods don't need to be findable by nmethod iterators and are permanent.
748 bool can_be_allocated_in_NonNMethod_space() const { return is_method_handle_intrinsic(); }
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* cld, Method* mh);
800 static void destroy_jmethod_id(ClassLoaderData* cld, 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* cld, 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 // Printing
1025 void print_short_name(outputStream* st = tty) const; // prints as klassname::methodname; Exposed so field engineers can debug VM
1026 #if INCLUDE_JVMTI
1027 void print_name(outputStream* st = tty) const; // prints as "virtual void foo(int)"; exposed for -Xlog:redefine+class
1028 #else
1029 void print_name(outputStream* st = tty) const PRODUCT_RETURN; // prints as "virtual void foo(int)"
1030 #endif
1031
1032 typedef int (*method_comparator_func)(Method* a, Method* b);
1033
1034 // Helper routine used for method sorting
1035 static void sort_methods(Array<Method*>* methods, bool set_idnums = true, method_comparator_func func = NULL);
1036
1037 // Deallocation function for redefine classes or if an error occurs
1038 void deallocate_contents(ClassLoaderData* loader_data);
1039
1040 void release_C_heap_structures();
1041
1042 Method* get_new_method() const {
1043 InstanceKlass* holder = method_holder();
1044 Method* new_method = holder->method_with_idnum(orig_method_idnum());
1045
1046 assert(new_method != NULL, "method_with_idnum() should not be NULL");
1047 assert(this != new_method, "sanity check");
1048 return new_method;
1049 }
1050
1051 // Printing
1052 #ifndef PRODUCT
1053 void print_on(outputStream* st) const;
1054 #endif
1055 void print_value_on(outputStream* st) const;
1056 void print_linkage_flags(outputStream* st) PRODUCT_RETURN;
1057
1058 const char* internal_name() const { return "{method}"; }
1059
1060 // Check for valid method pointer
1061 static bool has_method_vptr(const void* ptr);
1062 static bool is_valid_method(const Method* m);
1063
1064 // Verify
1065 void verify() { verify_on(tty); }
1066 void verify_on(outputStream* st);
1067
1068 private:
1069
1070 // Inlined elements
1071 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
1072 address* signature_handler_addr() const { return native_function_addr() + 1; }
1073
1074 void set_num_stack_arg_slots(int n) { constMethod()->set_num_stack_arg_slots(n); }
1075 };
1076
1077
1078 // Utility class for compressing line number tables
1079
1080 class CompressedLineNumberWriteStream: public CompressedWriteStream {
1081 private:
1082 int _bci;
1083 int _line;
1084 public:
1085 // Constructor
1086 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
1087 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
1088
1089 // Write (bci, line number) pair to stream
1090 void write_pair_regular(int bci_delta, int line_delta);
1091
1092 // If (bci delta, line delta) fits in (5-bit unsigned, 3-bit unsigned)
1093 // we save it as one byte, otherwise we write a 0xFF escape character
1094 // and use regular compression. 0x0 is used as end-of-stream terminator.
1095 void write_pair_inline(int bci, int line);
1096
1097 void write_pair(int bci, int line);
1098
1099 // Write end-of-stream marker
1100 void write_terminator() { write_byte(0); }
1101 };
1102
1103
1104 // Utility class for decompressing line number tables
1105
1106 class CompressedLineNumberReadStream: public CompressedReadStream {
1107 private:
1108 int _bci;
1109 int _line;
1110 public:
1111 // Constructor
1112 CompressedLineNumberReadStream(u_char* buffer);
1113 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
1114 bool read_pair();
1115 // Accessing bci and line number (after calling read_pair)
1116 int bci() const { return _bci; }
1117 int line() const { return _line; }
1118 };
1119
1120
1121 #if INCLUDE_JVMTI
1122
1123 /// Fast Breakpoints.
1124
1125 // If this structure gets more complicated (because bpts get numerous),
1126 // move it into its own header.
1127
1128 // There is presently no provision for concurrent access
1129 // to breakpoint lists, which is only OK for JVMTI because
1130 // breakpoints are written only at safepoints, and are read
1131 // concurrently only outside of safepoints.
1132
1133 class BreakpointInfo : public CHeapObj<mtClass> {
1134 friend class VMStructs;
1135 private:
1136 Bytecodes::Code _orig_bytecode;
1137 int _bci;
1138 u2 _name_index; // of method
1139 u2 _signature_index; // of method
1140 BreakpointInfo* _next; // simple storage allocation
1141
1142 public:
1143 BreakpointInfo(Method* m, int bci);
1144
1145 // accessors
1146 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
1147 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
1148 int bci() { return _bci; }
1149
1150 BreakpointInfo* next() const { return _next; }
1151 void set_next(BreakpointInfo* n) { _next = n; }
1152
1153 // helps for searchers
1154 bool match(const Method* m, int bci) {
1155 return bci == _bci && match(m);
1156 }
1157
1158 bool match(const Method* m) {
1159 return _name_index == m->name_index() &&
1160 _signature_index == m->signature_index();
1161 }
1162
1163 void set(Method* method);
1164 void clear(Method* method);
1165 };
1166
1167 #endif // INCLUDE_JVMTI
1168
1169 // Utility class for access exception handlers
1170 class ExceptionTable : public StackObj {
1171 private:
1172 ExceptionTableElement* _table;
1173 u2 _length;
1174
1175 public:
1176 ExceptionTable(const Method* m) {
1177 if (m->has_exception_handler()) {
1178 _table = m->exception_table_start();
1179 _length = m->exception_table_length();
1180 } else {
1181 _table = NULL;
1182 _length = 0;
1183 }
1184 }
1185
1186 int length() const {
1187 return _length;
1188 }
1189
1190 u2 start_pc(int idx) const {
1191 assert(idx < _length, "out of bounds");
1192 return _table[idx].start_pc;
1193 }
1194
1195 void set_start_pc(int idx, u2 value) {
1196 assert(idx < _length, "out of bounds");
1197 _table[idx].start_pc = value;
1198 }
1199
1200 u2 end_pc(int idx) const {
1201 assert(idx < _length, "out of bounds");
1202 return _table[idx].end_pc;
1203 }
1204
1205 void set_end_pc(int idx, u2 value) {
1206 assert(idx < _length, "out of bounds");
1207 _table[idx].end_pc = value;
1208 }
1209
1210 u2 handler_pc(int idx) const {
1211 assert(idx < _length, "out of bounds");
1212 return _table[idx].handler_pc;
1213 }
1214
1215 void set_handler_pc(int idx, u2 value) {
1216 assert(idx < _length, "out of bounds");
1217 _table[idx].handler_pc = value;
1218 }
1219
1220 u2 catch_type_index(int idx) const {
1221 assert(idx < _length, "out of bounds");
1222 return _table[idx].catch_type_index;
1223 }
1224
1225 void set_catch_type_index(int idx, u2 value) {
1226 assert(idx < _length, "out of bounds");
1227 _table[idx].catch_type_index = value;
1228 }
1229 };
1230
1231 #endif // SHARE_OOPS_METHOD_HPP