Fri, 29 Apr 2016 00:06:10 +0800
Added MIPS 64-bit port.
1 /*
2 * Copyright (c) 1997, 2013, 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 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_OOPS_METHODOOP_HPP
32 #define SHARE_VM_OOPS_METHODOOP_HPP
34 #include "classfile/vmSymbols.hpp"
35 #include "code/compressedStream.hpp"
36 #include "compiler/oopMap.hpp"
37 #include "interpreter/invocationCounter.hpp"
38 #include "oops/annotations.hpp"
39 #include "oops/constantPool.hpp"
40 #include "oops/methodCounters.hpp"
41 #include "oops/instanceKlass.hpp"
42 #include "oops/oop.hpp"
43 #include "oops/typeArrayOop.hpp"
44 #include "utilities/accessFlags.hpp"
45 #include "utilities/growableArray.hpp"
47 // A Method* represents a Java method.
48 //
49 // Memory layout (each line represents a word). Note that most applications load thousands of methods,
50 // so keeping the size of this structure small has a big impact on footprint.
51 //
52 // We put all oops and method_size first for better gc cache locality.
53 //
54 // The actual bytecodes are inlined after the end of the Method struct.
55 //
56 // There are bits in the access_flags telling whether inlined tables are present.
57 // Note that accessing the line number and local variable tables is not performance critical at all.
58 // Accessing the checked exceptions table is used by reflection, so we put that last to make access
59 // to it fast.
60 //
61 // The line number table is compressed and inlined following the byte codes. It is found as the first
62 // byte following the byte codes. The checked exceptions table and the local variable table are inlined
63 // after the line number table, and indexed from the end of the method. We do not compress the checked
64 // exceptions table since the average length is less than 2, and do not bother to compress the local
65 // variable table either since it is mostly absent.
66 //
67 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter)
68 //
69 // |------------------------------------------------------|
70 // | header |
71 // | klass |
72 // |------------------------------------------------------|
73 // | ConstMethod* (oop) |
74 // |------------------------------------------------------|
75 // | methodData (oop) |
76 // | methodCounters |
77 // |------------------------------------------------------|
78 // | access_flags |
79 // | vtable_index |
80 // |------------------------------------------------------|
81 // | result_index (C++ interpreter only) |
82 // |------------------------------------------------------|
83 // | method_size | intrinsic_id| flags |
84 // |------------------------------------------------------|
85 // | code (pointer) |
86 // | i2i (pointer) |
87 // | adapter (pointer) |
88 // | from_compiled_entry (pointer) |
89 // | from_interpreted_entry (pointer) |
90 // |------------------------------------------------------|
91 // | native_function (present only if native) |
92 // | signature_handler (present only if native) |
93 // |------------------------------------------------------|
96 class CheckedExceptionElement;
97 class LocalVariableTableElement;
98 class AdapterHandlerEntry;
99 class MethodData;
100 class MethodCounters;
101 class ConstMethod;
102 class InlineTableSizes;
103 class KlassSizeStats;
105 class Method : public Metadata {
106 friend class VMStructs;
107 private:
108 ConstMethod* _constMethod; // Method read-only data.
109 MethodData* _method_data;
110 MethodCounters* _method_counters;
111 AccessFlags _access_flags; // Access flags
112 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
113 // note: can have vtables with >2**16 elements (because of inheritance)
114 #ifdef CC_INTERP
115 int _result_index; // C++ interpreter needs for converting results to/from stack
116 #endif
117 u2 _method_size; // size of this object
118 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
119 u1 _jfr_towrite : 1, // Flags
120 _caller_sensitive : 1,
121 _force_inline : 1,
122 _hidden : 1,
123 _dont_inline : 1,
124 : 3;
126 #ifndef PRODUCT
127 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
128 #endif
129 #ifdef MIPS64
130 int _num_of_requests;
131 int _decay_counter;
132 #endif
133 // Entry point for calling both from and to the interpreter.
134 address _i2i_entry; // All-args-on-stack calling convention
135 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
136 AdapterHandlerEntry* _adapter;
137 // Entry point for calling from compiled code, to compiled code if it exists
138 // or else the interpreter.
139 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
140 // The entry point for calling both from and to compiled code is
141 // "_code->entry_point()". Because of tiered compilation and de-opt, this
142 // field can come and go. It can transition from NULL to not-null at any
143 // time (whenever a compile completes). It can transition from not-null to
144 // NULL only at safepoints (because of a de-opt).
145 nmethod* volatile _code; // Points to the corresponding piece of native code
146 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
148 // Constructor
149 Method(ConstMethod* xconst, AccessFlags access_flags, int size);
150 public:
152 static Method* allocate(ClassLoaderData* loader_data,
153 int byte_code_size,
154 AccessFlags access_flags,
155 InlineTableSizes* sizes,
156 ConstMethod::MethodType method_type,
157 TRAPS);
159 // CDS and vtbl checking can create an empty Method to get vtbl pointer.
160 Method(){}
162 // The Method vtable is restored by this call when the Method is in the
163 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for
164 // all the gory details. SA, dtrace and pstack helpers distinguish metadata
165 // by their vtable.
166 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
167 bool is_method() const volatile { return true; }
169 void restore_unshareable_info(TRAPS);
171 // accessors for instance variables
173 ConstMethod* constMethod() const { return _constMethod; }
174 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
175 #ifdef MIPS64
176 void incr_num_of_requests(int increment) { _num_of_requests += increment; }
177 void set_num_of_requests(int new_num) { _num_of_requests = new_num; }
178 int get_num_of_requests() const { return _num_of_requests; }
180 void incr_decay_counter(int increment) { _decay_counter += increment; }
181 void set_decay_counter(int new_num) { _decay_counter = new_num; }
182 int get_decay_counter() const { return _decay_counter; }
183 #endif
185 static address make_adapters(methodHandle mh, TRAPS);
186 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
187 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
189 // access flag
190 AccessFlags access_flags() const { return _access_flags; }
191 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
193 // name
194 Symbol* name() const { return constants()->symbol_at(name_index()); }
195 int name_index() const { return constMethod()->name_index(); }
196 void set_name_index(int index) { constMethod()->set_name_index(index); }
198 // signature
199 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
200 int signature_index() const { return constMethod()->signature_index(); }
201 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
203 // generics support
204 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
205 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
206 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
208 // annotations support
209 AnnotationArray* annotations() const {
210 return constMethod()->method_annotations();
211 }
212 AnnotationArray* parameter_annotations() const {
213 return constMethod()->parameter_annotations();
214 }
215 AnnotationArray* annotation_default() const {
216 return constMethod()->default_annotations();
217 }
218 AnnotationArray* type_annotations() const {
219 return constMethod()->type_annotations();
220 }
222 #ifdef CC_INTERP
223 void set_result_index(BasicType type);
224 int result_index() { return _result_index; }
225 #endif
227 // Helper routine: get klass name + "." + method name + signature as
228 // C string, for the purpose of providing more useful NoSuchMethodErrors
229 // and fatal error handling. The string is allocated in resource
230 // area if a buffer is not provided by the caller.
231 char* name_and_sig_as_C_string() const;
232 char* name_and_sig_as_C_string(char* buf, int size) const;
234 // Static routine in the situations we don't have a Method*
235 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
236 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
238 Bytecodes::Code java_code_at(int bci) const {
239 return Bytecodes::java_code_at(this, bcp_from(bci));
240 }
241 Bytecodes::Code code_at(int bci) const {
242 return Bytecodes::code_at(this, bcp_from(bci));
243 }
245 // JVMTI breakpoints
246 Bytecodes::Code orig_bytecode_at(int bci) const;
247 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
248 void set_breakpoint(int bci);
249 void clear_breakpoint(int bci);
250 void clear_all_breakpoints();
251 // Tracking number of breakpoints, for fullspeed debugging.
252 // Only mutated by VM thread.
253 u2 number_of_breakpoints() const {
254 if (method_counters() == NULL) {
255 return 0;
256 } else {
257 return method_counters()->number_of_breakpoints();
258 }
259 }
260 void incr_number_of_breakpoints(TRAPS) {
261 MethodCounters* mcs = get_method_counters(CHECK);
262 if (mcs != NULL) {
263 mcs->incr_number_of_breakpoints();
264 }
265 }
266 void decr_number_of_breakpoints(TRAPS) {
267 MethodCounters* mcs = get_method_counters(CHECK);
268 if (mcs != NULL) {
269 mcs->decr_number_of_breakpoints();
270 }
271 }
272 // Initialization only
273 void clear_number_of_breakpoints() {
274 if (method_counters() != NULL) {
275 method_counters()->clear_number_of_breakpoints();
276 }
277 }
279 // index into InstanceKlass methods() array
280 // note: also used by jfr
281 u2 method_idnum() const { return constMethod()->method_idnum(); }
282 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
284 // code size
285 int code_size() const { return constMethod()->code_size(); }
287 // method size
288 int method_size() const { return _method_size; }
289 void set_method_size(int size) {
290 assert(0 <= size && size < (1 << 16), "invalid method size");
291 _method_size = size;
292 }
294 // constant pool for Klass* holding this method
295 ConstantPool* constants() const { return constMethod()->constants(); }
296 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
298 // max stack
299 // return original max stack size for method verification
300 int verifier_max_stack() const { return constMethod()->max_stack(); }
301 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
302 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
304 // max locals
305 int max_locals() const { return constMethod()->max_locals(); }
306 void set_max_locals(int size) { constMethod()->set_max_locals(size); }
308 int highest_comp_level() const;
309 void set_highest_comp_level(int level);
310 int highest_osr_comp_level() const;
311 void set_highest_osr_comp_level(int level);
313 // Count of times method was exited via exception while interpreting
314 void interpreter_throwout_increment(TRAPS) {
315 MethodCounters* mcs = get_method_counters(CHECK);
316 if (mcs != NULL) {
317 mcs->interpreter_throwout_increment();
318 }
319 }
321 int interpreter_throwout_count() const {
322 if (method_counters() == NULL) {
323 return 0;
324 } else {
325 return method_counters()->interpreter_throwout_count();
326 }
327 }
329 // size of parameters
330 int size_of_parameters() const { return constMethod()->size_of_parameters(); }
331 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); }
333 bool has_stackmap_table() const {
334 return constMethod()->has_stackmap_table();
335 }
337 Array<u1>* stackmap_data() const {
338 return constMethod()->stackmap_data();
339 }
341 void set_stackmap_data(Array<u1>* sd) {
342 constMethod()->set_stackmap_data(sd);
343 }
345 // exception handler table
346 bool has_exception_handler() const
347 { return constMethod()->has_exception_handler(); }
348 int exception_table_length() const
349 { return constMethod()->exception_table_length(); }
350 ExceptionTableElement* exception_table_start() const
351 { return constMethod()->exception_table_start(); }
353 // Finds the first entry point bci of an exception handler for an
354 // exception of klass ex_klass thrown at throw_bci. A value of NULL
355 // for ex_klass indicates that the exception klass is not known; in
356 // this case it matches any constraint class. Returns -1 if the
357 // exception cannot be handled in this method. The handler
358 // constraint classes are loaded if necessary. Note that this may
359 // throw an exception if loading of the constraint classes causes
360 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
361 // If an exception is thrown, returns the bci of the
362 // exception handler which caused the exception to be thrown, which
363 // is needed for proper retries. See, for example,
364 // InterpreterRuntime::exception_handler_for_exception.
365 static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS);
367 // method data access
368 MethodData* method_data() const {
369 return _method_data;
370 }
372 void set_method_data(MethodData* data) {
373 // The store into method must be released. On platforms without
374 // total store order (TSO) the reference may become visible before
375 // the initialization of data otherwise.
376 OrderAccess::release_store_ptr((volatile void *)&_method_data, data);
377 }
379 MethodCounters* method_counters() const {
380 return _method_counters;
381 }
383 void set_method_counters(MethodCounters* counters) {
384 // The store into method must be released. On platforms without
385 // total store order (TSO) the reference may become visible before
386 // the initialization of data otherwise.
387 OrderAccess::release_store_ptr((volatile void *)&_method_counters, counters);
388 }
390 #ifdef TIERED
391 // We are reusing interpreter_invocation_count as a holder for the previous event count!
392 // We can do that since interpreter_invocation_count is not used in tiered.
393 int prev_event_count() const {
394 if (method_counters() == NULL) {
395 return 0;
396 } else {
397 return method_counters()->interpreter_invocation_count();
398 }
399 }
400 void set_prev_event_count(int count, TRAPS) {
401 MethodCounters* mcs = get_method_counters(CHECK);
402 if (mcs != NULL) {
403 mcs->set_interpreter_invocation_count(count);
404 }
405 }
406 jlong prev_time() const {
407 return method_counters() == NULL ? 0 : method_counters()->prev_time();
408 }
409 void set_prev_time(jlong time, TRAPS) {
410 MethodCounters* mcs = get_method_counters(CHECK);
411 if (mcs != NULL) {
412 mcs->set_prev_time(time);
413 }
414 }
415 float rate() const {
416 return method_counters() == NULL ? 0 : method_counters()->rate();
417 }
418 void set_rate(float rate, TRAPS) {
419 MethodCounters* mcs = get_method_counters(CHECK);
420 if (mcs != NULL) {
421 mcs->set_rate(rate);
422 }
423 }
424 #endif
426 int invocation_count();
427 int backedge_count();
429 bool was_executed_more_than(int n);
430 bool was_never_executed() { return !was_executed_more_than(0); }
432 static void build_interpreter_method_data(methodHandle method, TRAPS);
434 static MethodCounters* build_method_counters(Method* m, TRAPS);
436 int interpreter_invocation_count() {
437 if (TieredCompilation) return invocation_count();
438 else return (method_counters() == NULL) ? 0 :
439 method_counters()->interpreter_invocation_count();
440 }
441 int increment_interpreter_invocation_count(TRAPS) {
442 if (TieredCompilation) ShouldNotReachHere();
443 MethodCounters* mcs = get_method_counters(CHECK_0);
444 return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
445 }
447 #ifndef PRODUCT
448 int compiled_invocation_count() const { return _compiled_invocation_count; }
449 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
450 #endif // not PRODUCT
452 // Clear (non-shared space) pointers which could not be relevant
453 // if this (shared) method were mapped into another JVM.
454 void remove_unshareable_info();
456 // nmethod/verified compiler entry
457 address verified_code_entry();
458 bool check_code() const; // Not inline to avoid circular ref
459 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
460 void clear_code(); // Clear out any compiled code
461 static void set_code(methodHandle mh, nmethod* code);
462 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
463 address get_i2c_entry();
464 address get_c2i_entry();
465 address get_c2i_unverified_entry();
466 AdapterHandlerEntry* adapter() { return _adapter; }
467 // setup entry points
468 void link_method(methodHandle method, TRAPS);
469 // clear entry points. Used by sharing code
470 void unlink_method();
472 // vtable index
473 enum VtableIndexFlag {
474 // Valid vtable indexes are non-negative (>= 0).
475 // These few negative values are used as sentinels.
476 itable_index_max = -10, // first itable index, growing downward
477 pending_itable_index = -9, // itable index will be assigned
478 invalid_vtable_index = -4, // distinct from any valid vtable index
479 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
480 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
481 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
482 };
483 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
484 bool has_vtable_index() const { return _vtable_index >= 0; }
485 int vtable_index() const { return _vtable_index; }
486 void set_vtable_index(int index) { _vtable_index = index; }
487 DEBUG_ONLY(bool valid_itable_index() const { return _vtable_index <= pending_itable_index; })
488 bool has_itable_index() const { return _vtable_index <= itable_index_max; }
489 int itable_index() const { assert(valid_itable_index(), "");
490 return itable_index_max - _vtable_index; }
491 void set_itable_index(int index) { _vtable_index = itable_index_max - index; assert(valid_itable_index(), ""); }
493 // interpreter entry
494 address interpreter_entry() const { return _i2i_entry; }
495 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
496 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
498 // native function (used for native methods only)
499 enum {
500 native_bind_event_is_interesting = true
501 };
502 address native_function() const { return *(native_function_addr()); }
503 address critical_native_function();
505 // Must specify a real function (not NULL).
506 // Use clear_native_function() to unregister.
507 void set_native_function(address function, bool post_event_flag);
508 bool has_native_function() const;
509 void clear_native_function();
511 // signature handler (used for native methods only)
512 address signature_handler() const { return *(signature_handler_addr()); }
513 void set_signature_handler(address handler);
515 // Interpreter oopmap support
516 void mask_for(int bci, InterpreterOopMap* mask);
518 #ifndef PRODUCT
519 // operations on invocation counter
520 void print_invocation_count();
521 #endif
523 // byte codes
524 void set_code(address code) { return constMethod()->set_code(code); }
525 address code_base() const { return constMethod()->code_base(); }
526 bool contains(address bcp) const { return constMethod()->contains(bcp); }
528 // prints byte codes
529 void print_codes() const { print_codes_on(tty); }
530 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
531 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
533 // method parameters
534 bool has_method_parameters() const
535 { return constMethod()->has_method_parameters(); }
536 int method_parameters_length() const
537 { return constMethod()->method_parameters_length(); }
538 MethodParametersElement* method_parameters_start() const
539 { return constMethod()->method_parameters_start(); }
541 // checked exceptions
542 int checked_exceptions_length() const
543 { return constMethod()->checked_exceptions_length(); }
544 CheckedExceptionElement* checked_exceptions_start() const
545 { return constMethod()->checked_exceptions_start(); }
547 // localvariable table
548 bool has_localvariable_table() const
549 { return constMethod()->has_localvariable_table(); }
550 int localvariable_table_length() const
551 { return constMethod()->localvariable_table_length(); }
552 LocalVariableTableElement* localvariable_table_start() const
553 { return constMethod()->localvariable_table_start(); }
555 bool has_linenumber_table() const
556 { return constMethod()->has_linenumber_table(); }
557 u_char* compressed_linenumber_table() const
558 { return constMethod()->compressed_linenumber_table(); }
560 // method holder (the Klass* holding this method)
561 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
563 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
564 Symbol* klass_name() const; // returns the name of the method holder
565 BasicType result_type() const; // type of the method result
566 int result_type_index() const; // type index of the method result
567 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
568 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
570 // Checked exceptions thrown by this method (resolved to mirrors)
571 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
573 // Access flags
574 bool is_public() const { return access_flags().is_public(); }
575 bool is_private() const { return access_flags().is_private(); }
576 bool is_protected() const { return access_flags().is_protected(); }
577 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
578 bool is_static() const { return access_flags().is_static(); }
579 bool is_final() const { return access_flags().is_final(); }
580 bool is_synchronized() const { return access_flags().is_synchronized();}
581 bool is_native() const { return access_flags().is_native(); }
582 bool is_abstract() const { return access_flags().is_abstract(); }
583 bool is_strict() const { return access_flags().is_strict(); }
584 bool is_synthetic() const { return access_flags().is_synthetic(); }
586 // returns true if contains only return operation
587 bool is_empty_method() const;
589 // returns true if this is a vanilla constructor
590 bool is_vanilla_constructor() const;
592 // checks method and its method holder
593 bool is_final_method() const;
594 bool is_final_method(AccessFlags class_access_flags) const;
595 bool is_default_method() const;
597 // true if method needs no dynamic dispatch (final and/or no vtable entry)
598 bool can_be_statically_bound() const;
599 bool can_be_statically_bound(AccessFlags class_access_flags) const;
601 // returns true if the method has any backward branches.
602 bool has_loops() {
603 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
604 };
606 bool compute_has_loops_flag();
608 bool has_jsrs() {
609 return access_flags().has_jsrs();
610 };
611 void set_has_jsrs() {
612 _access_flags.set_has_jsrs();
613 }
615 // returns true if the method has any monitors.
616 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
617 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
619 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
621 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
622 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
623 // has not been computed yet.
624 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
625 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
627 // returns true if the method is an accessor function (setter/getter).
628 bool is_accessor() const;
630 // returns true if the method is an initializer (<init> or <clinit>).
631 bool is_initializer() const;
633 // returns true if the method is static OR if the classfile version < 51
634 bool has_valid_initializer_flags() const;
636 // returns true if the method name is <clinit> and the method has
637 // valid static initializer flags.
638 bool is_static_initializer() const;
640 // compiled code support
641 // NOTE: code() is inherently racy as deopt can be clearing code
642 // simultaneously. Use with caution.
643 bool has_compiled_code() const { return code() != NULL; }
645 // sizing
646 static int header_size() { return sizeof(Method)/HeapWordSize; }
647 static int size(bool is_native);
648 int size() const { return method_size(); }
649 #if INCLUDE_SERVICES
650 void collect_statistics(KlassSizeStats *sz) const;
651 #endif
653 // interpreter support
654 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
655 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
656 #ifdef CC_INTERP
657 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); }
658 #endif /* CC_INTERP */
659 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
660 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
661 static ByteSize method_data_offset() {
662 return byte_offset_of(Method, _method_data);
663 }
664 static ByteSize method_counters_offset() {
665 return byte_offset_of(Method, _method_counters);
666 }
667 #ifndef PRODUCT
668 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
669 #endif // not PRODUCT
670 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
671 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
672 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
673 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
675 // for code generation
676 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
677 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
678 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
680 // Static methods that are used to implement member methods where an exposed this pointer
681 // is needed due to possible GCs
682 static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS);
684 // Returns the byte code index from the byte code pointer
685 int bci_from(address bcp) const;
686 address bcp_from(int bci) const;
687 int validate_bci_from_bcx(intptr_t bcx) const;
689 // Returns the line number for a bci if debugging information for the method is prowided,
690 // -1 is returned otherwise.
691 int line_number_from_bci(int bci) const;
693 // Reflection support
694 bool is_overridden_in(Klass* k) const;
696 // Stack walking support
697 bool is_ignored_by_security_stack_walk() const;
699 // JSR 292 support
700 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
701 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
702 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
703 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
704 Symbol* signature, //anything at all
705 TRAPS);
706 static Klass* check_non_bcp_klass(Klass* klass);
708 // How many extra stack entries for invokedynamic when it's enabled
709 static const int extra_stack_entries_for_jsr292 = 1;
711 // this operates only on invoke methods:
712 // presize interpreter frames for extra interpreter stack entries, if needed
713 // Account for the extra appendix argument for invokehandle/invokedynamic
714 static int extra_stack_entries() { return EnableInvokeDynamic ? extra_stack_entries_for_jsr292 : 0; }
715 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize
717 // RedefineClasses() support:
718 bool is_old() const { return access_flags().is_old(); }
719 void set_is_old() { _access_flags.set_is_old(); }
720 bool is_obsolete() const { return access_flags().is_obsolete(); }
721 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
722 bool on_stack() const { return access_flags().on_stack(); }
723 void set_on_stack(const bool value);
725 // see the definition in Method*.cpp for the gory details
726 bool should_not_be_cached() const;
728 // JVMTI Native method prefixing support:
729 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
730 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
732 // Rewriting support
733 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
734 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
736 // jmethodID handling
737 // Because the useful life-span of a jmethodID cannot be determined,
738 // once created they are never reclaimed. The methods to which they refer,
739 // however, can be GC'ed away if the class is unloaded or if the method is
740 // made obsolete or deleted -- in these cases, the jmethodID
741 // refers to NULL (as is the case for any weak reference).
742 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
743 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
745 // Use resolve_jmethod_id() in situations where the caller is expected
746 // to provide a valid jmethodID; the only sanity checks are in asserts;
747 // result guaranteed not to be NULL.
748 inline static Method* resolve_jmethod_id(jmethodID mid) {
749 assert(mid != NULL, "JNI method id should not be null");
750 return *((Method**)mid);
751 }
753 // Use checked_resolve_jmethod_id() in situations where the caller
754 // should provide a valid jmethodID, but might not. NULL is returned
755 // when the jmethodID does not refer to a valid method.
756 static Method* checked_resolve_jmethod_id(jmethodID mid);
758 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
759 static bool is_method_id(jmethodID mid);
761 // Clear methods
762 static void clear_jmethod_ids(ClassLoaderData* loader_data);
763 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
765 // Get this method's jmethodID -- allocate if it doesn't exist
766 jmethodID jmethod_id() { methodHandle this_h(this);
767 return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
769 // Lookup the jmethodID for this method. Return NULL if not found.
770 // NOTE that this function can be called from a signal handler
771 // (see AsyncGetCallTrace support for Forte Analyzer) and this
772 // needs to be async-safe. No allocation should be done and
773 // so handles are not used to avoid deadlock.
774 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
776 // Support for inlining of intrinsic methods
777 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
778 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
780 // Helper routines for intrinsic_id() and vmIntrinsics::method().
781 void init_intrinsic_id(); // updates from _none if a match
782 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder);
784 bool jfr_towrite() { return _jfr_towrite; }
785 void set_jfr_towrite(bool x) { _jfr_towrite = x; }
786 bool caller_sensitive() { return _caller_sensitive; }
787 void set_caller_sensitive(bool x) { _caller_sensitive = x; }
788 bool force_inline() { return _force_inline; }
789 void set_force_inline(bool x) { _force_inline = x; }
790 bool dont_inline() { return _dont_inline; }
791 void set_dont_inline(bool x) { _dont_inline = x; }
792 bool is_hidden() { return _hidden; }
793 void set_hidden(bool x) { _hidden = x; }
794 ConstMethod::MethodType method_type() const {
795 return _constMethod->method_type();
796 }
797 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
799 // On-stack replacement support
800 bool has_osr_nmethod(int level, bool match_level) {
801 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
802 }
804 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
805 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
806 }
808 // Inline cache support
809 void cleanup_inline_caches();
811 // Find if klass for method is loaded
812 bool is_klass_loaded_by_klass_index(int klass_index) const;
813 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
815 // Indicates whether compilation failed earlier for this method, or
816 // whether it is not compilable for another reason like having a
817 // breakpoint set in it.
818 bool is_not_compilable(int comp_level = CompLevel_any) const;
819 void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
820 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
821 set_not_compilable(comp_level, false);
822 }
823 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
824 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
825 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
826 set_not_osr_compilable(comp_level, false);
827 }
828 bool is_always_compilable() const;
830 private:
831 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
833 public:
834 MethodCounters* get_method_counters(TRAPS) {
835 if (_method_counters == NULL) {
836 build_method_counters(this, CHECK_AND_CLEAR_NULL);
837 }
838 return _method_counters;
839 }
841 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
842 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
843 void clear_not_c1_compilable() { _access_flags.clear_not_c1_compilable(); }
844 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
845 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
846 void clear_not_c2_compilable() { _access_flags.clear_not_c2_compilable(); }
848 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit
849 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit
850 void clear_not_c1_osr_compilable() { clear_not_c1_compilable(); } // don't waste an accessFlags bit
851 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); }
852 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); }
853 void clear_not_c2_osr_compilable() { _access_flags.clear_not_c2_osr_compilable(); }
855 // Background compilation support
856 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
857 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
858 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
860 // Resolve all classes in signature, return 'true' if successful
861 static bool load_signature_classes(methodHandle m, TRAPS);
863 // Return if true if not all classes references in signature, including return type, has been loaded
864 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
866 // Printing
867 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
868 #if INCLUDE_JVMTI
869 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
870 #else
871 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)"
872 #endif
874 // Helper routine used for method sorting
875 static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
877 // Deallocation function for redefine classes or if an error occurs
878 void deallocate_contents(ClassLoaderData* loader_data);
880 // Printing
881 #ifndef PRODUCT
882 void print_on(outputStream* st) const;
883 #endif
884 void print_value_on(outputStream* st) const;
886 const char* internal_name() const { return "{method}"; }
888 // Check for valid method pointer
889 static bool has_method_vptr(const void* ptr);
890 bool is_valid_method() const;
892 // Verify
893 void verify() { verify_on(tty); }
894 void verify_on(outputStream* st);
896 private:
898 // Inlined elements
899 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
900 address* signature_handler_addr() const { return native_function_addr() + 1; }
901 };
904 // Utility class for compressing line number tables
906 class CompressedLineNumberWriteStream: public CompressedWriteStream {
907 private:
908 int _bci;
909 int _line;
910 public:
911 // Constructor
912 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
913 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
915 // Write (bci, line number) pair to stream
916 void write_pair_regular(int bci_delta, int line_delta);
918 inline void write_pair_inline(int bci, int line) {
919 int bci_delta = bci - _bci;
920 int line_delta = line - _line;
921 _bci = bci;
922 _line = line;
923 // Skip (0,0) deltas - they do not add information and conflict with terminator.
924 if (bci_delta == 0 && line_delta == 0) return;
925 // Check if bci is 5-bit and line number 3-bit unsigned.
926 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
927 // Compress into single byte.
928 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
929 // Check that value doesn't match escape character.
930 if (value != 0xFF) {
931 write_byte(value);
932 return;
933 }
934 }
935 write_pair_regular(bci_delta, line_delta);
936 }
938 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
939 // Disabling optimization doesn't work for methods in header files
940 // so we force it to call through the non-optimized version in the .cpp.
941 // It's gross, but it's the only way we can ensure that all callers are
942 // fixed. _MSC_VER is defined by the windows compiler
943 #if defined(_M_AMD64) && _MSC_VER >= 1400
944 void write_pair(int bci, int line);
945 #else
946 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
947 #endif
949 // Write end-of-stream marker
950 void write_terminator() { write_byte(0); }
951 };
954 // Utility class for decompressing line number tables
956 class CompressedLineNumberReadStream: public CompressedReadStream {
957 private:
958 int _bci;
959 int _line;
960 public:
961 // Constructor
962 CompressedLineNumberReadStream(u_char* buffer);
963 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
964 bool read_pair();
965 // Accessing bci and line number (after calling read_pair)
966 int bci() const { return _bci; }
967 int line() const { return _line; }
968 };
971 /// Fast Breakpoints.
973 // If this structure gets more complicated (because bpts get numerous),
974 // move it into its own header.
976 // There is presently no provision for concurrent access
977 // to breakpoint lists, which is only OK for JVMTI because
978 // breakpoints are written only at safepoints, and are read
979 // concurrently only outside of safepoints.
981 class BreakpointInfo : public CHeapObj<mtClass> {
982 friend class VMStructs;
983 private:
984 Bytecodes::Code _orig_bytecode;
985 int _bci;
986 u2 _name_index; // of method
987 u2 _signature_index; // of method
988 BreakpointInfo* _next; // simple storage allocation
990 public:
991 BreakpointInfo(Method* m, int bci);
993 // accessors
994 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
995 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
996 int bci() { return _bci; }
998 BreakpointInfo* next() const { return _next; }
999 void set_next(BreakpointInfo* n) { _next = n; }
1001 // helps for searchers
1002 bool match(const Method* m, int bci) {
1003 return bci == _bci && match(m);
1004 }
1006 bool match(const Method* m) {
1007 return _name_index == m->name_index() &&
1008 _signature_index == m->signature_index();
1009 }
1011 void set(Method* method);
1012 void clear(Method* method);
1013 };
1015 // Utility class for access exception handlers
1016 class ExceptionTable : public StackObj {
1017 private:
1018 ExceptionTableElement* _table;
1019 u2 _length;
1021 public:
1022 ExceptionTable(const Method* m) {
1023 if (m->has_exception_handler()) {
1024 _table = m->exception_table_start();
1025 _length = m->exception_table_length();
1026 } else {
1027 _table = NULL;
1028 _length = 0;
1029 }
1030 }
1032 int length() const {
1033 return _length;
1034 }
1036 u2 start_pc(int idx) const {
1037 assert(idx < _length, "out of bounds");
1038 return _table[idx].start_pc;
1039 }
1041 void set_start_pc(int idx, u2 value) {
1042 assert(idx < _length, "out of bounds");
1043 _table[idx].start_pc = value;
1044 }
1046 u2 end_pc(int idx) const {
1047 assert(idx < _length, "out of bounds");
1048 return _table[idx].end_pc;
1049 }
1051 void set_end_pc(int idx, u2 value) {
1052 assert(idx < _length, "out of bounds");
1053 _table[idx].end_pc = value;
1054 }
1056 u2 handler_pc(int idx) const {
1057 assert(idx < _length, "out of bounds");
1058 return _table[idx].handler_pc;
1059 }
1061 void set_handler_pc(int idx, u2 value) {
1062 assert(idx < _length, "out of bounds");
1063 _table[idx].handler_pc = value;
1064 }
1066 u2 catch_type_index(int idx) const {
1067 assert(idx < _length, "out of bounds");
1068 return _table[idx].catch_type_index;
1069 }
1071 void set_catch_type_index(int idx, u2 value) {
1072 assert(idx < _length, "out of bounds");
1073 _table[idx].catch_type_index = value;
1074 }
1075 };
1077 #endif // SHARE_VM_OOPS_METHODOOP_HPP