1 /*
2 * Copyright (c) 1997, 2011, 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/constMethodOop.hpp"
33 #include "oops/constantPoolOop.hpp"
34 #include "oops/instanceKlass.hpp"
35 #include "oops/oop.hpp"
36 #include "oops/typeArrayOop.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/growableArray.hpp"
39
40 // A methodOop represents a Java method.
41 //
42 // Memory layout (each line represents a word). Note that most applications load thousands of methods,
43 // so keeping the size of this structure small has a big impact on footprint.
44 //
45 // We put all oops and method_size first for better gc cache locality.
46 //
47 // The actual bytecodes are inlined after the end of the methodOopDesc struct.
48 //
49 // There are bits in the access_flags telling whether inlined tables are present.
50 // Note that accessing the line number and local variable tables is not performance critical at all.
51 // Accessing the checked exceptions table is used by reflection, so we put that last to make access
52 // to it fast.
53 //
54 // The line number table is compressed and inlined following the byte codes. It is found as the first
55 // byte following the byte codes. The checked exceptions table and the local variable table are inlined
56 // after the line number table, and indexed from the end of the method. We do not compress the checked
57 // exceptions table since the average length is less than 2, and do not bother to compress the local
58 // variable table either since it is mostly absent.
59 //
60 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter)
61 //
62 // |------------------------------------------------------|
63 // | header |
64 // | klass |
65 // |------------------------------------------------------|
66 // | constMethodOop (oop) |
67 // | constants (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, (unused) | 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 methodDataOopDesc;
107
108 class methodOopDesc : public oopDesc {
109 friend class methodKlass;
110 friend class VMStructs;
111 private:
112 constMethodOop _constMethod; // Method read-only data.
113 constantPoolOop _constants; // Constant pool
114 methodDataOop _method_data;
115 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
116 AccessFlags _access_flags; // Access flags
117 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
118 // note: can have vtables with >2**16 elements (because of inheritance)
119 #ifdef CC_INTERP
120 int _result_index; // C++ interpreter needs for converting results to/from stack
121 #endif
122 u2 _method_size; // size of this object
123 u2 _max_stack; // Maximum number of entries on the expression stack
124 u2 _max_locals; // Number of local variables used by this method
125 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
126 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
127 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
128 u2 _number_of_breakpoints; // fullspeed debugging support
129 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
130 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
131
132 #ifdef TIERED
133 jlong _prev_time; // Previous time the rate was acquired
134 float _rate; // Events (invocation and backedge counter increments) per millisecond
135 #endif
136
137 #ifndef PRODUCT
138 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
139 #endif
140 // Entry point for calling both from and to the interpreter.
141 address _i2i_entry; // All-args-on-stack calling convention
142 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked.
143 AdapterHandlerEntry* _adapter;
144 // Entry point for calling from compiled code, to compiled code if it exists
145 // or else the interpreter.
146 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
147 // The entry point for calling both from and to compiled code is
148 // "_code->entry_point()". Because of tiered compilation and de-opt, this
149 // field can come and go. It can transition from NULL to not-null at any
150 // time (whenever a compile completes). It can transition from not-null to
151 // NULL only at safepoints (because of a de-opt).
152 nmethod* volatile _code; // Points to the corresponding piece of native code
153 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
154
155 public:
156
157 // accessors for instance variables
158 constMethodOop constMethod() const { return _constMethod; }
159 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); }
160
161
162 static address make_adapters(methodHandle mh, TRAPS);
163 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
164 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
165
166 // access flag
167 AccessFlags access_flags() const { return _access_flags; }
168 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
169
170 // name
171 Symbol* name() const { return _constants->symbol_at(name_index()); }
172 int name_index() const { return constMethod()->name_index(); }
173 void set_name_index(int index) { constMethod()->set_name_index(index); }
174
175 // signature
176 Symbol* signature() const { return _constants->symbol_at(signature_index()); }
177 int signature_index() const { return constMethod()->signature_index(); }
178 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
179
180 // generics support
181 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (Symbol*)NULL); }
182 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
183 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
184
185 // annotations support
186 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); }
187 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); }
188 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); }
189
190 #ifdef CC_INTERP
191 void set_result_index(BasicType type);
192 int result_index() { return _result_index; }
193 #endif
194
195 // Helper routine: get klass name + "." + method name + signature as
196 // C string, for the purpose of providing more useful NoSuchMethodErrors
197 // and fatal error handling. The string is allocated in resource
198 // area if a buffer is not provided by the caller.
199 char* name_and_sig_as_C_string();
200 char* name_and_sig_as_C_string(char* buf, int size);
201
202 // Static routine in the situations we don't have a methodOop
203 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
204 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
205
206 Bytecodes::Code java_code_at(int bci) const {
207 return Bytecodes::java_code_at(this, bcp_from(bci));
208 }
209 Bytecodes::Code code_at(int bci) const {
210 return Bytecodes::code_at(this, bcp_from(bci));
211 }
212
213 // JVMTI breakpoints
214 Bytecodes::Code orig_bytecode_at(int bci) const;
215 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
216 void set_breakpoint(int bci);
217 void clear_breakpoint(int bci);
218 void clear_all_breakpoints();
219 // Tracking number of breakpoints, for fullspeed debugging.
220 // Only mutated by VM thread.
221 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
222 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
223 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
224 // Initialization only
225 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
226
227 // index into instanceKlass methods() array
228 u2 method_idnum() const { return constMethod()->method_idnum(); }
229 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
230
231 // code size
232 int code_size() const { return constMethod()->code_size(); }
233
234 // method size
235 int method_size() const { return _method_size; }
236 void set_method_size(int size) {
237 assert(0 <= size && size < (1 << 16), "invalid method size");
238 _method_size = size;
239 }
240
241 // constant pool for klassOop holding this method
242 constantPoolOop constants() const { return _constants; }
243 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); }
244
245 // max stack
246 int max_stack() const { return _max_stack; }
247 void set_max_stack(int size) { _max_stack = size; }
248
249 // max locals
250 int max_locals() const { return _max_locals; }
251 void set_max_locals(int size) { _max_locals = size; }
252
253 int highest_comp_level() const;
254 void set_highest_comp_level(int level);
255 int highest_osr_comp_level() const;
256 void set_highest_osr_comp_level(int level);
257
258 // Count of times method was exited via exception while interpreting
259 void interpreter_throwout_increment() {
260 if (_interpreter_throwout_count < 65534) {
261 _interpreter_throwout_count++;
262 }
263 }
264
265 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
266 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
267
268 // size of parameters
269 int size_of_parameters() const { return _size_of_parameters; }
270
271 bool has_stackmap_table() const {
272 return constMethod()->has_stackmap_table();
273 }
274
275 typeArrayOop stackmap_data() const {
276 return constMethod()->stackmap_data();
277 }
278
279 void set_stackmap_data(typeArrayOop sd) {
280 constMethod()->set_stackmap_data(sd);
281 }
282
283 // exception handler table
284 typeArrayOop exception_table() const
285 { return constMethod()->exception_table(); }
286 void set_exception_table(typeArrayOop e)
287 { constMethod()->set_exception_table(e); }
288 bool has_exception_handler() const
289 { return constMethod()->has_exception_handler(); }
290
291 // Finds the first entry point bci of an exception handler for an
292 // exception of klass ex_klass thrown at throw_bci. A value of NULL
293 // for ex_klass indicates that the exception klass is not known; in
294 // this case it matches any constraint class. Returns -1 if the
295 // exception cannot be handled in this method. The handler
296 // constraint classes are loaded if necessary. Note that this may
297 // throw an exception if loading of the constraint classes causes
298 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
299 // If an exception is thrown, returns the bci of the
300 // exception handler which caused the exception to be thrown, which
301 // is needed for proper retries. See, for example,
302 // InterpreterRuntime::exception_handler_for_exception.
303 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
304
305 // method data access
306 methodDataOop method_data() const {
307 return _method_data;
308 }
309 void set_method_data(methodDataOop data) {
310 oop_store_without_check((oop*)&_method_data, (oop)data);
311 }
312
313 // invocation counter
314 InvocationCounter* invocation_counter() { return &_invocation_counter; }
315 InvocationCounter* backedge_counter() { return &_backedge_counter; }
316
317 #ifdef TIERED
318 // We are reusing interpreter_invocation_count as a holder for the previous event count!
319 // We can do that since interpreter_invocation_count is not used in tiered.
320 int prev_event_count() const { return _interpreter_invocation_count; }
321 void set_prev_event_count(int count) { _interpreter_invocation_count = count; }
322 jlong prev_time() const { return _prev_time; }
323 void set_prev_time(jlong time) { _prev_time = time; }
324 float rate() const { return _rate; }
325 void set_rate(float rate) { _rate = rate; }
326 #endif
327
328 int invocation_count();
329 int backedge_count();
330
331 bool was_executed_more_than(int n);
332 bool was_never_executed() { return !was_executed_more_than(0); }
333
334 static void build_interpreter_method_data(methodHandle method, TRAPS);
335
336 int interpreter_invocation_count() {
337 if (TieredCompilation) return invocation_count();
338 else return _interpreter_invocation_count;
339 }
340 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
341 int increment_interpreter_invocation_count() {
342 if (TieredCompilation) ShouldNotReachHere();
343 return ++_interpreter_invocation_count;
344 }
345
346 #ifndef PRODUCT
347 int compiled_invocation_count() const { return _compiled_invocation_count; }
348 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
349 #endif // not PRODUCT
350
351 // Clear (non-shared space) pointers which could not be relevant
352 // if this (shared) method were mapped into another JVM.
353 void remove_unshareable_info();
354
355 // nmethod/verified compiler entry
356 address verified_code_entry();
357 bool check_code() const; // Not inline to avoid circular ref
358 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
359 void clear_code(); // Clear out any compiled code
360 static void set_code(methodHandle mh, nmethod* code);
361 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
362 address get_i2c_entry();
363 address get_c2i_entry();
364 address get_c2i_unverified_entry();
365 AdapterHandlerEntry* adapter() { return _adapter; }
366 // setup entry points
367 void link_method(methodHandle method, TRAPS);
368 // clear entry points. Used by sharing code
369 void unlink_method();
370
371 // vtable index
372 enum VtableIndexFlag {
373 // Valid vtable indexes are non-negative (>= 0).
374 // These few negative values are used as sentinels.
375 highest_unused_vtable_index_value = -5,
376 invalid_vtable_index = -4, // distinct from any valid vtable index
377 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
378 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
379 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
380 };
381 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
382 int vtable_index() const { assert(valid_vtable_index(), "");
383 return _vtable_index; }
384 void set_vtable_index(int index) { _vtable_index = index; }
385
386 // interpreter entry
387 address interpreter_entry() const { return _i2i_entry; }
388 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
389 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
390 int interpreter_kind(void) {
391 return constMethod()->interpreter_kind();
392 }
393 void set_interpreter_kind();
394 void set_interpreter_kind(int kind) {
395 constMethod()->set_interpreter_kind(kind);
396 }
397
398 // native function (used for native methods only)
399 enum {
400 native_bind_event_is_interesting = true
401 };
402 address native_function() const { return *(native_function_addr()); }
403 // Must specify a real function (not NULL).
404 // Use clear_native_function() to unregister.
405 void set_native_function(address function, bool post_event_flag);
406 bool has_native_function() const;
407 void clear_native_function();
408
409 // signature handler (used for native methods only)
410 address signature_handler() const { return *(signature_handler_addr()); }
411 void set_signature_handler(address handler);
412
413 // Interpreter oopmap support
414 void mask_for(int bci, InterpreterOopMap* mask);
415
416 #ifndef PRODUCT
417 // operations on invocation counter
418 void print_invocation_count();
419 #endif
420
421 // byte codes
422 void set_code(address code) { return constMethod()->set_code(code); }
423 address code_base() const { return constMethod()->code_base(); }
424 bool contains(address bcp) const { return constMethod()->contains(bcp); }
425
426 // prints byte codes
427 void print_codes() const { print_codes_on(tty); }
428 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
429 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
430
431 // checked exceptions
432 int checked_exceptions_length() const
433 { return constMethod()->checked_exceptions_length(); }
434 CheckedExceptionElement* checked_exceptions_start() const
435 { return constMethod()->checked_exceptions_start(); }
436
437 // localvariable table
438 bool has_localvariable_table() const
439 { return constMethod()->has_localvariable_table(); }
440 int localvariable_table_length() const
441 { return constMethod()->localvariable_table_length(); }
442 LocalVariableTableElement* localvariable_table_start() const
443 { return constMethod()->localvariable_table_start(); }
444
445 bool has_linenumber_table() const
446 { return constMethod()->has_linenumber_table(); }
447 u_char* compressed_linenumber_table() const
448 { return constMethod()->compressed_linenumber_table(); }
449
450 // method holder (the klassOop holding this method)
451 klassOop method_holder() const { return _constants->pool_holder(); }
452
453 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
454 Symbol* klass_name() const; // returns the name of the method holder
455 BasicType result_type() const; // type of the method result
456 int result_type_index() const; // type index of the method result
457 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
458 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
459
460 // Checked exceptions thrown by this method (resolved to mirrors)
461 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
462
463 // Access flags
464 bool is_public() const { return access_flags().is_public(); }
465 bool is_private() const { return access_flags().is_private(); }
466 bool is_protected() const { return access_flags().is_protected(); }
467 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
468 bool is_static() const { return access_flags().is_static(); }
469 bool is_final() const { return access_flags().is_final(); }
470 bool is_synchronized() const { return access_flags().is_synchronized();}
471 bool is_native() const { return access_flags().is_native(); }
472 bool is_abstract() const { return access_flags().is_abstract(); }
473 bool is_strict() const { return access_flags().is_strict(); }
474 bool is_synthetic() const { return access_flags().is_synthetic(); }
475
476 // returns true if contains only return operation
477 bool is_empty_method() const;
478
479 // returns true if this is a vanilla constructor
480 bool is_vanilla_constructor() const;
481
482 // checks method and its method holder
483 bool is_final_method() const;
484 bool is_strict_method() const;
485
486 // true if method needs no dynamic dispatch (final and/or no vtable entry)
487 bool can_be_statically_bound() const;
488
489 // returns true if the method has any backward branches.
490 bool has_loops() {
491 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
492 };
493
494 bool compute_has_loops_flag();
495
496 bool has_jsrs() {
497 return access_flags().has_jsrs();
498 };
499 void set_has_jsrs() {
500 _access_flags.set_has_jsrs();
501 }
502
503 // returns true if the method has any monitors.
504 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
505 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
506
507 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
508
509 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
510 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
511 // has not been computed yet.
512 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
513 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
514
515 // returns true if the method is an accessor function (setter/getter).
516 bool is_accessor() const;
517
518 // returns true if the method is an initializer (<init> or <clinit>).
519 bool is_initializer() const;
520
521 // returns true if the method is static OR if the classfile version < 51
522 bool has_valid_initializer_flags() const;
523
524 // returns true if the method name is <clinit> and the method has
525 // valid static initializer flags.
526 bool is_static_initializer() const;
527
528 // compiled code support
529 // NOTE: code() is inherently racy as deopt can be clearing code
530 // simultaneously. Use with caution.
531 bool has_compiled_code() const { return code() != NULL; }
532
533 // sizing
534 static int object_size(bool is_native);
535 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; }
536 int object_size() const { return method_size(); }
537
538 bool object_is_parsable() const { return method_size() > 0; }
539
540 // interpreter support
541 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); }
542 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); }
543 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); }
544 #ifdef CC_INTERP
545 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); }
546 #endif /* CC_INTERP */
547 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); }
548 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); }
549 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); }
550 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); }
551 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); }
552 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); }
553 static ByteSize method_data_offset() {
554 return byte_offset_of(methodOopDesc, _method_data);
555 }
556 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); }
557 #ifndef PRODUCT
558 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); }
559 #endif // not PRODUCT
560 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); }
561 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); }
562 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); }
563 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); }
564 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); }
565
566 // for code generation
567 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); }
568 static int interpreter_invocation_counter_offset_in_bytes()
569 { return offset_of(methodOopDesc, _interpreter_invocation_count); }
570 static int intrinsic_id_offset_in_bytes() { return offset_of(methodOopDesc, _intrinsic_id); }
571 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
572
573 // Static methods that are used to implement member methods where an exposed this pointer
574 // is needed due to possible GCs
575 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS);
576
577 // Returns the byte code index from the byte code pointer
578 int bci_from(address bcp) const;
579 address bcp_from(int bci) const;
580 int validate_bci_from_bcx(intptr_t bcx) const;
581
582 // Returns the line number for a bci if debugging information for the method is prowided,
583 // -1 is returned otherwise.
584 int line_number_from_bci(int bci) const;
585
586 // Reflection support
587 bool is_overridden_in(klassOop k) const;
588
589 // JSR 292 support
590 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); }
591 static bool is_method_handle_invoke_name(vmSymbols::SID name_sid);
592 static bool is_method_handle_invoke_name(Symbol* name) {
593 return is_method_handle_invoke_name(vmSymbols::find_sid(name));
594 }
595 // Tests if this method is an internal adapter frame from the
596 // MethodHandleCompiler.
597 bool is_method_handle_adapter() const;
598 static methodHandle make_invoke_method(KlassHandle holder,
599 Symbol* name, //invokeExact or invokeGeneric
600 Symbol* signature, //anything at all
601 Handle method_type,
602 TRAPS);
603 // these operate only on invoke methods:
604 oop method_handle_type() const;
605 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1
606 // presize interpreter frames for extra interpreter stack entries, if needed
607 // method handles want to be able to push a few extra values (e.g., a bound receiver), and
608 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
609 // all without checking for a stack overflow
610 static int extra_stack_entries() { return EnableInvokeDynamic ? (int) MethodHandlePushLimit + 3 : 0; }
611 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize()
612
613 // RedefineClasses() support:
614 bool is_old() const { return access_flags().is_old(); }
615 void set_is_old() { _access_flags.set_is_old(); }
616 bool is_obsolete() const { return access_flags().is_obsolete(); }
617 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
618 // see the definition in methodOop.cpp for the gory details
619 bool should_not_be_cached() const;
620
621 // JVMTI Native method prefixing support:
622 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
623 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
624
625 // Rewriting support
626 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
627 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
628
629 // Get this method's jmethodID -- allocate if it doesn't exist
630 jmethodID jmethod_id() { methodHandle this_h(this);
631 return instanceKlass::get_jmethod_id(method_holder(), this_h); }
632
633 // Lookup the jmethodID for this method. Return NULL if not found.
634 // NOTE that this function can be called from a signal handler
635 // (see AsyncGetCallTrace support for Forte Analyzer) and this
636 // needs to be async-safe. No allocation should be done and
637 // so handles are not used to avoid deadlock.
638 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
639
640 // JNI static invoke cached itable index accessors
641 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
642 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
643
644 // Support for inlining of intrinsic methods
645 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
646 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
647
648 // Helper routines for intrinsic_id() and vmIntrinsics::method().
649 void init_intrinsic_id(); // updates from _none if a match
650 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder);
651
652 // On-stack replacement support
653 bool has_osr_nmethod(int level, bool match_level) {
654 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
655 }
656
657 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
658 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level);
659 }
660
661 // Inline cache support
662 void cleanup_inline_caches();
663
664 // Find if klass for method is loaded
665 bool is_klass_loaded_by_klass_index(int klass_index) const;
666 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
667
668 // Indicates whether compilation failed earlier for this method, or
669 // whether it is not compilable for another reason like having a
670 // breakpoint set in it.
671 bool is_not_compilable(int comp_level = CompLevel_any) const;
672 void set_not_compilable(int comp_level = CompLevel_all, bool report = true);
673 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
674 set_not_compilable(comp_level, false);
675 }
676 bool is_not_osr_compilable(int comp_level = CompLevel_any) const {
677 return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable();
678 }
679 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); }
680 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
681 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
682 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
683 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
684
685 // Background compilation support
686 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
687 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
688 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
689
690 // Resolve all classes in signature, return 'true' if successful
691 static bool load_signature_classes(methodHandle m, TRAPS);
692
693 // Return if true if not all classes references in signature, including return type, has been loaded
694 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
695
696 // Printing
697 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
698 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)"
699
700 // Helper routine used for method sorting
701 static void sort_methods(objArrayOop methods,
702 objArrayOop methods_annotations,
703 objArrayOop methods_parameter_annotations,
704 objArrayOop methods_default_annotations,
705 bool idempotent = false);
706
707 // size of parameters
708 void set_size_of_parameters(int size) { _size_of_parameters = size; }
709 private:
710
711 // Inlined elements
712 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
713 address* signature_handler_addr() const { return native_function_addr() + 1; }
714
715 // Garbage collection support
716 oop* adr_constMethod() const { return (oop*)&_constMethod; }
717 oop* adr_constants() const { return (oop*)&_constants; }
718 oop* adr_method_data() const { return (oop*)&_method_data; }
719 };
720
721
722 // Utility class for compressing line number tables
723
724 class CompressedLineNumberWriteStream: public CompressedWriteStream {
725 private:
726 int _bci;
727 int _line;
728 public:
729 // Constructor
730 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
731 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
732
733 // Write (bci, line number) pair to stream
734 void write_pair_regular(int bci_delta, int line_delta);
735
736 inline void write_pair_inline(int bci, int line) {
737 int bci_delta = bci - _bci;
738 int line_delta = line - _line;
739 _bci = bci;
740 _line = line;
741 // Skip (0,0) deltas - they do not add information and conflict with terminator.
742 if (bci_delta == 0 && line_delta == 0) return;
743 // Check if bci is 5-bit and line number 3-bit unsigned.
744 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
745 // Compress into single byte.
746 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
747 // Check that value doesn't match escape character.
748 if (value != 0xFF) {
749 write_byte(value);
750 return;
751 }
752 }
753 write_pair_regular(bci_delta, line_delta);
754 }
755
756 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
757 // Disabling optimization doesn't work for methods in header files
758 // so we force it to call through the non-optimized version in the .cpp.
759 // It's gross, but it's the only way we can ensure that all callers are
760 // fixed. _MSC_VER is defined by the windows compiler
761 #if defined(_M_AMD64) && _MSC_VER >= 1400
762 void write_pair(int bci, int line);
763 #else
764 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
765 #endif
766
767 // Write end-of-stream marker
768 void write_terminator() { write_byte(0); }
769 };
770
771
772 // Utility class for decompressing line number tables
773
774 class CompressedLineNumberReadStream: public CompressedReadStream {
775 private:
776 int _bci;
777 int _line;
778 public:
779 // Constructor
780 CompressedLineNumberReadStream(u_char* buffer);
781 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
782 bool read_pair();
783 // Accessing bci and line number (after calling read_pair)
784 int bci() const { return _bci; }
785 int line() const { return _line; }
786 };
787
788
789 /// Fast Breakpoints.
790
791 // If this structure gets more complicated (because bpts get numerous),
792 // move it into its own header.
793
794 // There is presently no provision for concurrent access
795 // to breakpoint lists, which is only OK for JVMTI because
796 // breakpoints are written only at safepoints, and are read
797 // concurrently only outside of safepoints.
798
799 class BreakpointInfo : public CHeapObj {
800 friend class VMStructs;
801 private:
802 Bytecodes::Code _orig_bytecode;
803 int _bci;
804 u2 _name_index; // of method
805 u2 _signature_index; // of method
806 BreakpointInfo* _next; // simple storage allocation
807
808 public:
809 BreakpointInfo(methodOop m, int bci);
810
811 // accessors
812 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
813 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
814 int bci() { return _bci; }
815
816 BreakpointInfo* next() const { return _next; }
817 void set_next(BreakpointInfo* n) { _next = n; }
818
819 // helps for searchers
820 bool match(const methodOopDesc* m, int bci) {
821 return bci == _bci && match(m);
822 }
823
824 bool match(const methodOopDesc* m) {
825 return _name_index == m->name_index() &&
826 _signature_index == m->signature_index();
827 }
828
829 void set(methodOop method);
830 void clear(methodOop method);
831 };
832
833 #endif // SHARE_VM_OOPS_METHODOOP_HPP