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comparison src/share/vm/oops/method.hpp @ 6725:da91efe96a93

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6964458: Reimplement class meta-data storage to use native memory Summary: Remove PermGen, allocate meta-data in metaspace linked to class loaders, rewrite GC walking, rewrite and rename metadata to be C++ classes Reviewed-by: jmasa, stefank, never, coleenp, kvn, brutisso, mgerdin, dholmes, jrose, twisti, roland Contributed-by: jmasa <jon.masamitsu@oracle.com>, stefank <stefan.karlsson@oracle.com>, mgerdin <mikael.gerdin@oracle.com>, never <tom.rodriguez@oracle.com>
author coleenp
date Sat, 01 Sep 2012 13:25:18 -0400
parents src/share/vm/oops/methodOop.hpp@93c71eb28866
children fa6e618671d7
comparison
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6724:36d1d483d5d6 6725:da91efe96a93
1 /*
2 * Copyright (c) 1997, 2012, 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_VM_OOPS_METHODOOP_HPP
26 #define SHARE_VM_OOPS_METHODOOP_HPP
27
28 #include "classfile/vmSymbols.hpp"
29 #include "code/compressedStream.hpp"
30 #include "compiler/oopMap.hpp"
31 #include "interpreter/invocationCounter.hpp"
32 #include "oops/annotations.hpp"
33 #include "oops/constMethod.hpp"
34 #include "oops/constantPool.hpp"
35 #include "oops/instanceKlass.hpp"
36 #include "oops/oop.hpp"
37 #include "oops/typeArrayOop.hpp"
38 #include "utilities/accessFlags.hpp"
39 #include "utilities/growableArray.hpp"
40
41 // A Method* represents a Java method.
42 //
43 // Memory layout (each line represents a word). Note that most applications load thousands of methods,
44 // so keeping the size of this structure small has a big impact on footprint.
45 //
46 // We put all oops and method_size first for better gc cache locality.
47 //
48 // The actual bytecodes are inlined after the end of the Method struct.
49 //
50 // There are bits in the access_flags telling whether inlined tables are present.
51 // Note that accessing the line number and local variable tables is not performance critical at all.
52 // Accessing the checked exceptions table is used by reflection, so we put that last to make access
53 // to it fast.
54 //
55 // The line number table is compressed and inlined following the byte codes. It is found as the first
56 // byte following the byte codes. The checked exceptions table and the local variable table are inlined
57 // after the line number table, and indexed from the end of the method. We do not compress the checked
58 // exceptions table since the average length is less than 2, and do not bother to compress the local
59 // variable table either since it is mostly absent.
60 //
61 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter)
62 //
63 // |------------------------------------------------------|
64 // | header |
65 // | klass |
66 // |------------------------------------------------------|
67 // | ConstMethod* (oop) |
68 // |------------------------------------------------------|
69 // | methodData (oop) |
70 // | interp_invocation_count |
71 // |------------------------------------------------------|
72 // | access_flags |
73 // | vtable_index |
74 // |------------------------------------------------------|
75 // | result_index (C++ interpreter only) |
76 // |------------------------------------------------------|
77 // | method_size | max_stack |
78 // | max_locals | size_of_parameters |
79 // |------------------------------------------------------|
80 // |intrinsic_id| flags | throwout_count |
81 // |------------------------------------------------------|
82 // | num_breakpoints | (unused) |
83 // |------------------------------------------------------|
84 // | invocation_counter |
85 // | backedge_counter |
86 // |------------------------------------------------------|
87 // | prev_time (tiered only, 64 bit wide) |
88 // | |
89 // |------------------------------------------------------|
90 // | rate (tiered) |
91 // |------------------------------------------------------|
92 // | code (pointer) |
93 // | i2i (pointer) |
94 // | adapter (pointer) |
95 // | from_compiled_entry (pointer) |
96 // | from_interpreted_entry (pointer) |
97 // |------------------------------------------------------|
98 // | native_function (present only if native) |
99 // | signature_handler (present only if native) |
100 // |------------------------------------------------------|
101
102
103 class CheckedExceptionElement;
104 class LocalVariableTableElement;
105 class AdapterHandlerEntry;
106 class MethodData;
107
108 class Method : public Metadata {
109 friend class VMStructs;
110 private:
111 ConstMethod* _constMethod; // Method read-only data.
112 MethodData* _method_data;
113 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
114 AccessFlags _access_flags; // Access flags
115 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
116 // note: can have vtables with >2**16 elements (because of inheritance)
117 #ifdef CC_INTERP
118 int _result_index; // C++ interpreter needs for converting results to/from stack
119 #endif
120 u2 _method_size; // size of this object
121 u2 _max_stack; // Maximum number of entries on the expression stack
122 u2 _max_locals; // Number of local variables used by this method
123 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
124 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
125 u1 _jfr_towrite : 1, // Flags
126 _force_inline : 1,
127 _hidden : 1,
128 _dont_inline : 1,
129 : 4;
130 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
131 u2 _number_of_breakpoints; // fullspeed debugging support
132 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
133 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
134
135 #ifdef TIERED
136 jlong _prev_time; // Previous time the rate was acquired
137 float _rate; // Events (invocation and backedge counter increments) per millisecond
138 #endif
139
140 #ifndef PRODUCT
141 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
142 #endif
143 // Entry point for calling both from and to the interpreter.
144 address _i2i_entry; // All-args-on-stack calling convention
145 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
146 AdapterHandlerEntry* _adapter;
147 // Entry point for calling from compiled code, to compiled code if it exists
148 // or else the interpreter.
149 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
150 // The entry point for calling both from and to compiled code is
151 // "_code->entry_point()". Because of tiered compilation and de-opt, this
152 // field can come and go. It can transition from NULL to not-null at any
153 // time (whenever a compile completes). It can transition from not-null to
154 // NULL only at safepoints (because of a de-opt).
155 nmethod* volatile _code; // Points to the corresponding piece of native code
156 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
157
158 // Constructor
159 Method(ConstMethod* xconst, AccessFlags access_flags, int size);
160 public:
161 static Method* allocate(ClassLoaderData* loader_data,
162 int byte_code_size,
163 AccessFlags access_flags,
164 int compressed_line_number_size,
165 int localvariable_table_length,
166 int exception_table_length,
167 int checked_exceptions_length,
168 TRAPS);
169
170 Method() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
171 bool is_method() const volatile { return true; }
172
173 // accessors for instance variables
174 ConstMethod* constMethod() const { return _constMethod; }
175 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
176
177
178 static address make_adapters(methodHandle mh, TRAPS);
179 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
180 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
181
182 // access flag
183 AccessFlags access_flags() const { return _access_flags; }
184 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
185
186 // name
187 Symbol* name() const { return constants()->symbol_at(name_index()); }
188 int name_index() const { return constMethod()->name_index(); }
189 void set_name_index(int index) { constMethod()->set_name_index(index); }
190
191 // signature
192 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
193 int signature_index() const { return constMethod()->signature_index(); }
194 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
195
196 // generics support
197 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
198 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
199 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
200
201 // annotations support
202 AnnotationArray* annotations() const {
203 InstanceKlass* ik = InstanceKlass::cast(method_holder());
204 if (ik->annotations() == NULL) {
205 return NULL;
206 }
207 return ik->annotations()->get_method_annotations_of(method_idnum());
208 }
209 AnnotationArray* parameter_annotations() const {
210 InstanceKlass* ik = InstanceKlass::cast(method_holder());
211 if (ik->annotations() == NULL) {
212 return NULL;
213 }
214 return ik->annotations()->get_method_parameter_annotations_of(method_idnum());
215 }
216 AnnotationArray* annotation_default() const {
217 InstanceKlass* ik = InstanceKlass::cast(method_holder());
218 if (ik->annotations() == NULL) {
219 return NULL;
220 }
221 return ik->annotations()->get_method_default_annotations_of(method_idnum());
222 }
223
224 #ifdef CC_INTERP
225 void set_result_index(BasicType type);
226 int result_index() { return _result_index; }
227 #endif
228
229 // Helper routine: get klass name + "." + method name + signature as
230 // C string, for the purpose of providing more useful NoSuchMethodErrors
231 // and fatal error handling. The string is allocated in resource
232 // area if a buffer is not provided by the caller.
233 char* name_and_sig_as_C_string() const;
234 char* name_and_sig_as_C_string(char* buf, int size) const;
235
236 // Static routine in the situations we don't have a Method*
237 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
238 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
239
240 Bytecodes::Code java_code_at(int bci) const {
241 return Bytecodes::java_code_at(this, bcp_from(bci));
242 }
243 Bytecodes::Code code_at(int bci) const {
244 return Bytecodes::code_at(this, bcp_from(bci));
245 }
246
247 // JVMTI breakpoints
248 Bytecodes::Code orig_bytecode_at(int bci) const;
249 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
250 void set_breakpoint(int bci);
251 void clear_breakpoint(int bci);
252 void clear_all_breakpoints();
253 // Tracking number of breakpoints, for fullspeed debugging.
254 // Only mutated by VM thread.
255 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
256 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
257 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
258 // Initialization only
259 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
260
261 // index into InstanceKlass methods() array
262 // note: also used by jfr
263 u2 method_idnum() const { return constMethod()->method_idnum(); }
264 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
265
266 // code size
267 int code_size() const { return constMethod()->code_size(); }
268
269 // method size
270 int method_size() const { return _method_size; }
271 void set_method_size(int size) {
272 assert(0 <= size && size < (1 << 16), "invalid method size");
273 _method_size = size;
274 }
275
276 // constant pool for Klass* holding this method
277 ConstantPool* constants() const { return constMethod()->constants(); }
278 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
279
280 // max stack
281 // return original max stack size for method verification
282 int verifier_max_stack() const { return _max_stack; }
283 int max_stack() const { return _max_stack + extra_stack_entries(); }
284 void set_max_stack(int size) { _max_stack = size; }
285
286 // max locals
287 int max_locals() const { return _max_locals; }
288 void set_max_locals(int size) { _max_locals = size; }
289
290 int highest_comp_level() const;
291 void set_highest_comp_level(int level);
292 int highest_osr_comp_level() const;
293 void set_highest_osr_comp_level(int level);
294
295 // Count of times method was exited via exception while interpreting
296 void interpreter_throwout_increment() {
297 if (_interpreter_throwout_count < 65534) {
298 _interpreter_throwout_count++;
299 }
300 }
301
302 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
303 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
304
305 // size of parameters
306 int size_of_parameters() const { return _size_of_parameters; }
307
308 bool has_stackmap_table() const {
309 return constMethod()->has_stackmap_table();
310 }
311
312 Array<u1>* stackmap_data() const {
313 return constMethod()->stackmap_data();
314 }
315
316 void set_stackmap_data(Array<u1>* sd) {
317 constMethod()->set_stackmap_data(sd);
318 }
319
320 // exception handler table
321 bool has_exception_handler() const
322 { return constMethod()->has_exception_handler(); }
323 int exception_table_length() const
324 { return constMethod()->exception_table_length(); }
325 ExceptionTableElement* exception_table_start() const
326 { return constMethod()->exception_table_start(); }
327
328 // Finds the first entry point bci of an exception handler for an
329 // exception of klass ex_klass thrown at throw_bci. A value of NULL
330 // for ex_klass indicates that the exception klass is not known; in
331 // this case it matches any constraint class. Returns -1 if the
332 // exception cannot be handled in this method. The handler
333 // constraint classes are loaded if necessary. Note that this may
334 // throw an exception if loading of the constraint classes causes
335 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
336 // If an exception is thrown, returns the bci of the
337 // exception handler which caused the exception to be thrown, which
338 // is needed for proper retries. See, for example,
339 // InterpreterRuntime::exception_handler_for_exception.
340 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
341
342 // method data access
343 MethodData* method_data() const {
344 return _method_data;
345 }
346 void set_method_data(MethodData* data) {
347 _method_data = data;
348 }
349
350 // invocation counter
351 InvocationCounter* invocation_counter() { return &_invocation_counter; }
352 InvocationCounter* backedge_counter() { return &_backedge_counter; }
353
354 #ifdef TIERED
355 // We are reusing interpreter_invocation_count as a holder for the previous event count!
356 // We can do that since interpreter_invocation_count is not used in tiered.
357 int prev_event_count() const { return _interpreter_invocation_count; }
358 void set_prev_event_count(int count) { _interpreter_invocation_count = count; }
359 jlong prev_time() const { return _prev_time; }
360 void set_prev_time(jlong time) { _prev_time = time; }
361 float rate() const { return _rate; }
362 void set_rate(float rate) { _rate = rate; }
363 #endif
364
365 int invocation_count();
366 int backedge_count();
367
368 bool was_executed_more_than(int n);
369 bool was_never_executed() { return !was_executed_more_than(0); }
370
371 static void build_interpreter_method_data(methodHandle method, TRAPS);
372
373 int interpreter_invocation_count() {
374 if (TieredCompilation) return invocation_count();
375 else return _interpreter_invocation_count;
376 }
377 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
378 int increment_interpreter_invocation_count() {
379 if (TieredCompilation) ShouldNotReachHere();
380 return ++_interpreter_invocation_count;
381 }
382
383 #ifndef PRODUCT
384 int compiled_invocation_count() const { return _compiled_invocation_count; }
385 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
386 #endif // not PRODUCT
387
388 // Clear (non-shared space) pointers which could not be relevant
389 // if this (shared) method were mapped into another JVM.
390 void remove_unshareable_info();
391
392 // nmethod/verified compiler entry
393 address verified_code_entry();
394 bool check_code() const; // Not inline to avoid circular ref
395 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
396 void clear_code(); // Clear out any compiled code
397 static void set_code(methodHandle mh, nmethod* code);
398 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
399 address get_i2c_entry();
400 address get_c2i_entry();
401 address get_c2i_unverified_entry();
402 AdapterHandlerEntry* adapter() { return _adapter; }
403 // setup entry points
404 void link_method(methodHandle method, TRAPS);
405 // clear entry points. Used by sharing code
406 void unlink_method();
407
408 // vtable index
409 enum VtableIndexFlag {
410 // Valid vtable indexes are non-negative (>= 0).
411 // These few negative values are used as sentinels.
412 highest_unused_vtable_index_value = -5,
413 invalid_vtable_index = -4, // distinct from any valid vtable index
414 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
415 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
416 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
417 };
418 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
419 int vtable_index() const { assert(valid_vtable_index(), "");
420 return _vtable_index; }
421 void set_vtable_index(int index) { _vtable_index = index; }
422
423 // interpreter entry
424 address interpreter_entry() const { return _i2i_entry; }
425 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
426 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
427 int interpreter_kind(void) {
428 return constMethod()->interpreter_kind();
429 }
430 void set_interpreter_kind();
431 void set_interpreter_kind(int kind) {
432 constMethod()->set_interpreter_kind(kind);
433 }
434
435 // native function (used for native methods only)
436 enum {
437 native_bind_event_is_interesting = true
438 };
439 address native_function() const { return *(native_function_addr()); }
440 address critical_native_function();
441
442 // Must specify a real function (not NULL).
443 // Use clear_native_function() to unregister.
444 void set_native_function(address function, bool post_event_flag);
445 bool has_native_function() const;
446 void clear_native_function();
447
448 // signature handler (used for native methods only)
449 address signature_handler() const { return *(signature_handler_addr()); }
450 void set_signature_handler(address handler);
451
452 // Interpreter oopmap support
453 void mask_for(int bci, InterpreterOopMap* mask);
454
455 #ifndef PRODUCT
456 // operations on invocation counter
457 void print_invocation_count();
458 #endif
459
460 // byte codes
461 void set_code(address code) { return constMethod()->set_code(code); }
462 address code_base() const { return constMethod()->code_base(); }
463 bool contains(address bcp) const { return constMethod()->contains(bcp); }
464
465 // prints byte codes
466 void print_codes() const { print_codes_on(tty); }
467 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
468 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
469
470 // checked exceptions
471 int checked_exceptions_length() const
472 { return constMethod()->checked_exceptions_length(); }
473 CheckedExceptionElement* checked_exceptions_start() const
474 { return constMethod()->checked_exceptions_start(); }
475
476 // localvariable table
477 bool has_localvariable_table() const
478 { return constMethod()->has_localvariable_table(); }
479 int localvariable_table_length() const
480 { return constMethod()->localvariable_table_length(); }
481 LocalVariableTableElement* localvariable_table_start() const
482 { return constMethod()->localvariable_table_start(); }
483
484 bool has_linenumber_table() const
485 { return constMethod()->has_linenumber_table(); }
486 u_char* compressed_linenumber_table() const
487 { return constMethod()->compressed_linenumber_table(); }
488
489 // method holder (the Klass* holding this method)
490 Klass* method_holder() const { return constants()->pool_holder(); }
491
492 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
493 Symbol* klass_name() const; // returns the name of the method holder
494 BasicType result_type() const; // type of the method result
495 int result_type_index() const; // type index of the method result
496 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
497 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
498
499 // Checked exceptions thrown by this method (resolved to mirrors)
500 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
501
502 // Access flags
503 bool is_public() const { return access_flags().is_public(); }
504 bool is_private() const { return access_flags().is_private(); }
505 bool is_protected() const { return access_flags().is_protected(); }
506 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
507 bool is_static() const { return access_flags().is_static(); }
508 bool is_final() const { return access_flags().is_final(); }
509 bool is_synchronized() const { return access_flags().is_synchronized();}
510 bool is_native() const { return access_flags().is_native(); }
511 bool is_abstract() const { return access_flags().is_abstract(); }
512 bool is_strict() const { return access_flags().is_strict(); }
513 bool is_synthetic() const { return access_flags().is_synthetic(); }
514
515 // returns true if contains only return operation
516 bool is_empty_method() const;
517
518 // returns true if this is a vanilla constructor
519 bool is_vanilla_constructor() const;
520
521 // checks method and its method holder
522 bool is_final_method() const;
523 bool is_strict_method() const;
524
525 // true if method needs no dynamic dispatch (final and/or no vtable entry)
526 bool can_be_statically_bound() const;
527
528 // returns true if the method has any backward branches.
529 bool has_loops() {
530 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
531 };
532
533 bool compute_has_loops_flag();
534
535 bool has_jsrs() {
536 return access_flags().has_jsrs();
537 };
538 void set_has_jsrs() {
539 _access_flags.set_has_jsrs();
540 }
541
542 // returns true if the method has any monitors.
543 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
544 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
545
546 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
547
548 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
549 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
550 // has not been computed yet.
551 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
552 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
553
554 // returns true if the method is an accessor function (setter/getter).
555 bool is_accessor() const;
556
557 // returns true if the method is an initializer (<init> or <clinit>).
558 bool is_initializer() const;
559
560 // returns true if the method is static OR if the classfile version < 51
561 bool has_valid_initializer_flags() const;
562
563 // returns true if the method name is <clinit> and the method has
564 // valid static initializer flags.
565 bool is_static_initializer() const;
566
567 // compiled code support
568 // NOTE: code() is inherently racy as deopt can be clearing code
569 // simultaneously. Use with caution.
570 bool has_compiled_code() const { return code() != NULL; }
571
572 // sizing
573 static int header_size() { return sizeof(Method)/HeapWordSize; }
574 static int size(bool is_native);
575 int size() const { return method_size(); }
576
577 // interpreter support
578 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
579 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
580 #ifdef CC_INTERP
581 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); }
582 #endif /* CC_INTERP */
583 static ByteSize size_of_locals_offset() { return byte_offset_of(Method, _max_locals ); }
584 static ByteSize size_of_parameters_offset() { return byte_offset_of(Method, _size_of_parameters); }
585 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
586 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
587 static ByteSize invocation_counter_offset() { return byte_offset_of(Method, _invocation_counter); }
588 static ByteSize backedge_counter_offset() { return byte_offset_of(Method, _backedge_counter); }
589 static ByteSize method_data_offset() {
590 return byte_offset_of(Method, _method_data);
591 }
592 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(Method, _interpreter_invocation_count); }
593 #ifndef PRODUCT
594 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
595 #endif // not PRODUCT
596 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
597 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
598 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
599 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
600 static ByteSize max_stack_offset() { return byte_offset_of(Method, _max_stack ); }
601
602 // for code generation
603 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
604 static int interpreter_invocation_counter_offset_in_bytes()
605 { return offset_of(Method, _interpreter_invocation_count); }
606 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
607 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
608
609 // Static methods that are used to implement member methods where an exposed this pointer
610 // is needed due to possible GCs
611 static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS);
612
613 // Returns the byte code index from the byte code pointer
614 int bci_from(address bcp) const;
615 address bcp_from(int bci) const;
616 int validate_bci_from_bcx(intptr_t bcx) const;
617
618 // Returns the line number for a bci if debugging information for the method is prowided,
619 // -1 is returned otherwise.
620 int line_number_from_bci(int bci) const;
621
622 // Reflection support
623 bool is_overridden_in(Klass* k) const;
624
625 // JSR 292 support
626 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
627 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
628 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
629 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
630 Symbol* signature, //anything at all
631 TRAPS);
632 static Klass* check_non_bcp_klass(Klass* klass);
633 // these operate only on invoke methods:
634 // presize interpreter frames for extra interpreter stack entries, if needed
635 // method handles want to be able to push a few extra values (e.g., a bound receiver), and
636 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
637 // all without checking for a stack overflow
638 static int extra_stack_entries() { return EnableInvokeDynamic ? 2 : 0; }
639 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize()
640
641 // RedefineClasses() support:
642 bool is_old() const { return access_flags().is_old(); }
643 void set_is_old() { _access_flags.set_is_old(); }
644 bool is_obsolete() const { return access_flags().is_obsolete(); }
645 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
646 bool on_stack() const { return access_flags().on_stack(); }
647 void set_on_stack(const bool value);
648
649 // see the definition in Method*.cpp for the gory details
650 bool should_not_be_cached() const;
651
652 // JVMTI Native method prefixing support:
653 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
654 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
655
656 // Rewriting support
657 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
658 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
659
660 // jmethodID handling
661 // Because the useful life-span of a jmethodID cannot be determined,
662 // once created they are never reclaimed. The methods to which they refer,
663 // however, can be GC'ed away if the class is unloaded or if the method is
664 // made obsolete or deleted -- in these cases, the jmethodID
665 // refers to NULL (as is the case for any weak reference).
666 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
667 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
668
669 // Use resolve_jmethod_id() in situations where the caller is expected
670 // to provide a valid jmethodID; the only sanity checks are in asserts;
671 // result guaranteed not to be NULL.
672 inline static Method* resolve_jmethod_id(jmethodID mid) {
673 assert(mid != NULL, "JNI method id should not be null");
674 return *((Method**)mid);
675 }
676
677 // Use checked_resolve_jmethod_id() in situations where the caller
678 // should provide a valid jmethodID, but might not. NULL is returned
679 // when the jmethodID does not refer to a valid method.
680 static Method* checked_resolve_jmethod_id(jmethodID mid);
681
682 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
683 static bool is_method_id(jmethodID mid);
684
685 // Clear methods
686 static void clear_jmethod_ids(ClassLoaderData* loader_data);
687 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
688
689 // Get this method's jmethodID -- allocate if it doesn't exist
690 jmethodID jmethod_id() { methodHandle this_h(this);
691 return InstanceKlass::get_jmethod_id(InstanceKlass::cast(method_holder()), this_h); }
692
693 // Lookup the jmethodID for this method. Return NULL if not found.
694 // NOTE that this function can be called from a signal handler
695 // (see AsyncGetCallTrace support for Forte Analyzer) and this
696 // needs to be async-safe. No allocation should be done and
697 // so handles are not used to avoid deadlock.
698 jmethodID find_jmethod_id_or_null() { return InstanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
699
700 // JNI static invoke cached itable index accessors
701 int cached_itable_index() { return InstanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
702 void set_cached_itable_index(int index) { InstanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
703
704 // Support for inlining of intrinsic methods
705 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
706 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
707
708 // Helper routines for intrinsic_id() and vmIntrinsics::method().
709 void init_intrinsic_id(); // updates from _none if a match
710 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder);
711
712 bool jfr_towrite() { return _jfr_towrite; }
713 void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; }
714
715 bool force_inline() { return _force_inline; }
716 void set_force_inline(bool x) { _force_inline = x; }
717 bool dont_inline() { return _dont_inline; }
718 void set_dont_inline(bool x) { _dont_inline = x; }
719 bool is_hidden() { return _hidden; }
720 void set_hidden(bool x) { _hidden = x; }
721
722 // On-stack replacement support
723 bool has_osr_nmethod(int level, bool match_level) {
724 return InstanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
725 }
726
727 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
728 return InstanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level);
729 }
730
731 // Inline cache support
732 void cleanup_inline_caches();
733
734 // Find if klass for method is loaded
735 bool is_klass_loaded_by_klass_index(int klass_index) const;
736 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
737
738 // Indicates whether compilation failed earlier for this method, or
739 // whether it is not compilable for another reason like having a
740 // breakpoint set in it.
741 bool is_not_compilable(int comp_level = CompLevel_any) const;
742 void set_not_compilable(int comp_level = CompLevel_all, bool report = true);
743 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
744 set_not_compilable(comp_level, false);
745 }
746 bool is_not_osr_compilable(int comp_level = CompLevel_any) const {
747 return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable();
748 }
749 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); }
750 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
751 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
752 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
753 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
754
755 // Background compilation support
756 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
757 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
758 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
759
760 // Resolve all classes in signature, return 'true' if successful
761 static bool load_signature_classes(methodHandle m, TRAPS);
762
763 // Return if true if not all classes references in signature, including return type, has been loaded
764 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
765
766 // Printing
767 void print_short_name(outputStream* st = tty) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
768 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)"
769
770 // Helper routine used for method sorting
771 static void sort_methods(Array<Method*>* methods,
772 Array<AnnotationArray*>* methods_annotations,
773 Array<AnnotationArray*>* methods_parameter_annotations,
774 Array<AnnotationArray*>* methods_default_annotations,
775 bool idempotent = false);
776
777 // size of parameters
778 void set_size_of_parameters(int size) { _size_of_parameters = size; }
779
780 // Deallocation function for redefine classes or if an error occurs
781 void deallocate_contents(ClassLoaderData* loader_data);
782
783 // Printing
784 #ifndef PRODUCT
785 void print_on(outputStream* st) const;
786 #endif
787 void print_value_on(outputStream* st) const;
788
789 const char* internal_name() const { return "{method}"; }
790
791 // Verify
792 void verify() { verify_on(tty); }
793 void verify_on(outputStream* st);
794
795 private:
796
797 // Inlined elements
798 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
799 address* signature_handler_addr() const { return native_function_addr() + 1; }
800 };
801
802
803 // Utility class for compressing line number tables
804
805 class CompressedLineNumberWriteStream: public CompressedWriteStream {
806 private:
807 int _bci;
808 int _line;
809 public:
810 // Constructor
811 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
812 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
813
814 // Write (bci, line number) pair to stream
815 void write_pair_regular(int bci_delta, int line_delta);
816
817 inline void write_pair_inline(int bci, int line) {
818 int bci_delta = bci - _bci;
819 int line_delta = line - _line;
820 _bci = bci;
821 _line = line;
822 // Skip (0,0) deltas - they do not add information and conflict with terminator.
823 if (bci_delta == 0 && line_delta == 0) return;
824 // Check if bci is 5-bit and line number 3-bit unsigned.
825 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
826 // Compress into single byte.
827 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
828 // Check that value doesn't match escape character.
829 if (value != 0xFF) {
830 write_byte(value);
831 return;
832 }
833 }
834 write_pair_regular(bci_delta, line_delta);
835 }
836
837 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
838 // Disabling optimization doesn't work for methods in header files
839 // so we force it to call through the non-optimized version in the .cpp.
840 // It's gross, but it's the only way we can ensure that all callers are
841 // fixed. _MSC_VER is defined by the windows compiler
842 #if defined(_M_AMD64) && _MSC_VER >= 1400
843 void write_pair(int bci, int line);
844 #else
845 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
846 #endif
847
848 // Write end-of-stream marker
849 void write_terminator() { write_byte(0); }
850 };
851
852
853 // Utility class for decompressing line number tables
854
855 class CompressedLineNumberReadStream: public CompressedReadStream {
856 private:
857 int _bci;
858 int _line;
859 public:
860 // Constructor
861 CompressedLineNumberReadStream(u_char* buffer);
862 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
863 bool read_pair();
864 // Accessing bci and line number (after calling read_pair)
865 int bci() const { return _bci; }
866 int line() const { return _line; }
867 };
868
869
870 /// Fast Breakpoints.
871
872 // If this structure gets more complicated (because bpts get numerous),
873 // move it into its own header.
874
875 // There is presently no provision for concurrent access
876 // to breakpoint lists, which is only OK for JVMTI because
877 // breakpoints are written only at safepoints, and are read
878 // concurrently only outside of safepoints.
879
880 class BreakpointInfo : public CHeapObj<mtClass> {
881 friend class VMStructs;
882 private:
883 Bytecodes::Code _orig_bytecode;
884 int _bci;
885 u2 _name_index; // of method
886 u2 _signature_index; // of method
887 BreakpointInfo* _next; // simple storage allocation
888
889 public:
890 BreakpointInfo(Method* m, int bci);
891
892 // accessors
893 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
894 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
895 int bci() { return _bci; }
896
897 BreakpointInfo* next() const { return _next; }
898 void set_next(BreakpointInfo* n) { _next = n; }
899
900 // helps for searchers
901 bool match(const Method* m, int bci) {
902 return bci == _bci && match(m);
903 }
904
905 bool match(const Method* m) {
906 return _name_index == m->name_index() &&
907 _signature_index == m->signature_index();
908 }
909
910 void set(Method* method);
911 void clear(Method* method);
912 };
913
914 // Utility class for access exception handlers
915 class ExceptionTable : public StackObj {
916 private:
917 ExceptionTableElement* _table;
918 u2 _length;
919
920 public:
921 ExceptionTable(Method* m) {
922 if (m->has_exception_handler()) {
923 _table = m->exception_table_start();
924 _length = m->exception_table_length();
925 } else {
926 _table = NULL;
927 _length = 0;
928 }
929 }
930
931 int length() const {
932 return _length;
933 }
934
935 u2 start_pc(int idx) const {
936 assert(idx < _length, "out of bounds");
937 return _table[idx].start_pc;
938 }
939
940 void set_start_pc(int idx, u2 value) {
941 assert(idx < _length, "out of bounds");
942 _table[idx].start_pc = value;
943 }
944
945 u2 end_pc(int idx) const {
946 assert(idx < _length, "out of bounds");
947 return _table[idx].end_pc;
948 }
949
950 void set_end_pc(int idx, u2 value) {
951 assert(idx < _length, "out of bounds");
952 _table[idx].end_pc = value;
953 }
954
955 u2 handler_pc(int idx) const {
956 assert(idx < _length, "out of bounds");
957 return _table[idx].handler_pc;
958 }
959
960 void set_handler_pc(int idx, u2 value) {
961 assert(idx < _length, "out of bounds");
962 _table[idx].handler_pc = value;
963 }
964
965 u2 catch_type_index(int idx) const {
966 assert(idx < _length, "out of bounds");
967 return _table[idx].catch_type_index;
968 }
969
970 void set_catch_type_index(int idx, u2 value) {
971 assert(idx < _length, "out of bounds");
972 _table[idx].catch_type_index = value;
973 }
974 };
975
976 #endif // SHARE_VM_OOPS_METHODOOP_HPP