1 /*
2 * Copyright (c) 1997, 2010, 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 // A methodOop represents a Java method.
26 //
27 // Memory layout (each line represents a word). Note that most applications load thousands of methods,
28 // so keeping the size of this structure small has a big impact on footprint.
29 //
30 // We put all oops and method_size first for better gc cache locality.
31 //
32 // The actual bytecodes are inlined after the end of the methodOopDesc struct.
33 //
34 // There are bits in the access_flags telling whether inlined tables are present.
35 // Note that accessing the line number and local variable tables is not performance critical at all.
36 // Accessing the checked exceptions table is used by reflection, so we put that last to make access
37 // to it fast.
38 //
39 // The line number table is compressed and inlined following the byte codes. It is found as the first
40 // byte following the byte codes. The checked exceptions table and the local variable table are inlined
41 // after the line number table, and indexed from the end of the method. We do not compress the checked
42 // exceptions table since the average length is less than 2, and do not bother to compress the local
43 // variable table either since it is mostly absent.
44 //
45 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter)
46 //
47 // |------------------------------------------------------|
48 // | header |
49 // | klass |
50 // |------------------------------------------------------|
51 // | constMethodOop (oop) |
52 // | constants (oop) |
53 // |------------------------------------------------------|
54 // | methodData (oop) |
55 // | interp_invocation_count |
56 // |------------------------------------------------------|
57 // | access_flags |
58 // | vtable_index |
59 // |------------------------------------------------------|
60 // | result_index (C++ interpreter only) |
61 // |------------------------------------------------------|
62 // | method_size | max_stack |
63 // | max_locals | size_of_parameters |
64 // |------------------------------------------------------|
65 // | intrinsic_id, (unused) | throwout_count |
66 // |------------------------------------------------------|
67 // | num_breakpoints | (unused) |
68 // |------------------------------------------------------|
69 // | invocation_counter |
70 // | backedge_counter |
71 // |------------------------------------------------------|
72 // | code (pointer) |
73 // | i2i (pointer) |
74 // | adapter (pointer) |
75 // | from_compiled_entry (pointer) |
76 // | from_interpreted_entry (pointer) |
77 // |------------------------------------------------------|
78 // | native_function (present only if native) |
79 // | signature_handler (present only if native) |
80 // |------------------------------------------------------|
81
82
83 class CheckedExceptionElement;
84 class LocalVariableTableElement;
85 class AdapterHandlerEntry;
86 class methodDataOopDesc;
87
88 class methodOopDesc : public oopDesc {
89 friend class methodKlass;
90 friend class VMStructs;
91 private:
92 constMethodOop _constMethod; // Method read-only data.
93 constantPoolOop _constants; // Constant pool
94 methodDataOop _method_data;
95 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
96 AccessFlags _access_flags; // Access flags
97 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
98 // note: can have vtables with >2**16 elements (because of inheritance)
99 #ifdef CC_INTERP
100 int _result_index; // C++ interpreter needs for converting results to/from stack
101 #endif
102 u2 _method_size; // size of this object
103 u2 _max_stack; // Maximum number of entries on the expression stack
104 u2 _max_locals; // Number of local variables used by this method
105 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
106 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
107 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
108 u2 _number_of_breakpoints; // fullspeed debugging support
109 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
110 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
111
112 #ifndef PRODUCT
113 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
114 #endif
115 // Entry point for calling both from and to the interpreter.
116 address _i2i_entry; // All-args-on-stack calling convention
117 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked.
118 AdapterHandlerEntry* _adapter;
119 // Entry point for calling from compiled code, to compiled code if it exists
120 // or else the interpreter.
121 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
122 // The entry point for calling both from and to compiled code is
123 // "_code->entry_point()". Because of tiered compilation and de-opt, this
124 // field can come and go. It can transition from NULL to not-null at any
125 // time (whenever a compile completes). It can transition from not-null to
126 // NULL only at safepoints (because of a de-opt).
127 nmethod* volatile _code; // Points to the corresponding piece of native code
128 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
129
130 public:
131
132 static const bool IsUnsafeConc = false;
133 static const bool IsSafeConc = true;
134
135 // accessors for instance variables
136 constMethodOop constMethod() const { return _constMethod; }
137 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); }
138
139
140 static address make_adapters(methodHandle mh, TRAPS);
141 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
142 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
143
144 // access flag
145 AccessFlags access_flags() const { return _access_flags; }
146 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
147
148 // name
149 symbolOop name() const { return _constants->symbol_at(name_index()); }
150 int name_index() const { return constMethod()->name_index(); }
151 void set_name_index(int index) { constMethod()->set_name_index(index); }
152
153 // signature
154 symbolOop signature() const { return _constants->symbol_at(signature_index()); }
155 int signature_index() const { return constMethod()->signature_index(); }
156 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
157
158 // generics support
159 symbolOop generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); }
160 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
161 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
162
163 // annotations support
164 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); }
165 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); }
166 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); }
167
168 #ifdef CC_INTERP
169 void set_result_index(BasicType type);
170 int result_index() { return _result_index; }
171 #endif
172
173 // Helper routine: get klass name + "." + method name + signature as
174 // C string, for the purpose of providing more useful NoSuchMethodErrors
175 // and fatal error handling. The string is allocated in resource
176 // area if a buffer is not provided by the caller.
177 char* name_and_sig_as_C_string();
178 char* name_and_sig_as_C_string(char* buf, int size);
179
180 // Static routine in the situations we don't have a methodOop
181 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature);
182 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size);
183
184 // JVMTI breakpoints
185 Bytecodes::Code orig_bytecode_at(int bci);
186 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
187 void set_breakpoint(int bci);
188 void clear_breakpoint(int bci);
189 void clear_all_breakpoints();
190 // Tracking number of breakpoints, for fullspeed debugging.
191 // Only mutated by VM thread.
192 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
193 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
194 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
195 // Initialization only
196 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
197
198 // index into instanceKlass methods() array
199 u2 method_idnum() const { return constMethod()->method_idnum(); }
200 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
201
202 // code size
203 int code_size() const { return constMethod()->code_size(); }
204
205 // method size
206 int method_size() const { return _method_size; }
207 void set_method_size(int size) {
208 assert(0 <= size && size < (1 << 16), "invalid method size");
209 _method_size = size;
210 }
211
212 // constant pool for klassOop holding this method
213 constantPoolOop constants() const { return _constants; }
214 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); }
215
216 // max stack
217 int max_stack() const { return _max_stack; }
218 void set_max_stack(int size) { _max_stack = size; }
219
220 // max locals
221 int max_locals() const { return _max_locals; }
222 void set_max_locals(int size) { _max_locals = size; }
223
224 int highest_comp_level() const;
225 void set_highest_comp_level(int level);
226 int highest_osr_comp_level() const;
227 void set_highest_osr_comp_level(int level);
228
229 // Count of times method was exited via exception while interpreting
230 void interpreter_throwout_increment() {
231 if (_interpreter_throwout_count < 65534) {
232 _interpreter_throwout_count++;
233 }
234 }
235
236 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
237 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
238
239 // size of parameters
240 int size_of_parameters() const { return _size_of_parameters; }
241
242 bool has_stackmap_table() const {
243 return constMethod()->has_stackmap_table();
244 }
245
246 typeArrayOop stackmap_data() const {
247 return constMethod()->stackmap_data();
248 }
249
250 // exception handler table
251 typeArrayOop exception_table() const
252 { return constMethod()->exception_table(); }
253 void set_exception_table(typeArrayOop e)
254 { constMethod()->set_exception_table(e); }
255 bool has_exception_handler() const
256 { return constMethod()->has_exception_handler(); }
257
258 // Finds the first entry point bci of an exception handler for an
259 // exception of klass ex_klass thrown at throw_bci. A value of NULL
260 // for ex_klass indicates that the exception klass is not known; in
261 // this case it matches any constraint class. Returns -1 if the
262 // exception cannot be handled in this method. The handler
263 // constraint classes are loaded if necessary. Note that this may
264 // throw an exception if loading of the constraint classes causes
265 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
266 // If an exception is thrown, returns the bci of the
267 // exception handler which caused the exception to be thrown, which
268 // is needed for proper retries. See, for example,
269 // InterpreterRuntime::exception_handler_for_exception.
270 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
271
272 // method data access
273 methodDataOop method_data() const {
274 return _method_data;
275 }
276 void set_method_data(methodDataOop data) {
277 oop_store_without_check((oop*)&_method_data, (oop)data);
278 }
279
280 // invocation counter
281 InvocationCounter* invocation_counter() { return &_invocation_counter; }
282 InvocationCounter* backedge_counter() { return &_backedge_counter; }
283
284 int invocation_count();
285 int backedge_count();
286
287 bool was_executed_more_than(int n);
288 bool was_never_executed() { return !was_executed_more_than(0); }
289
290 static void build_interpreter_method_data(methodHandle method, TRAPS);
291
292 int interpreter_invocation_count() {
293 if (TieredCompilation) return invocation_count();
294 else return _interpreter_invocation_count;
295 }
296 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
297 int increment_interpreter_invocation_count() {
298 if (TieredCompilation) ShouldNotReachHere();
299 return ++_interpreter_invocation_count;
300 }
301
302 #ifndef PRODUCT
303 int compiled_invocation_count() const { return _compiled_invocation_count; }
304 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
305 #endif // not PRODUCT
306
307 // Clear (non-shared space) pointers which could not be relevant
308 // if this (shared) method were mapped into another JVM.
309 void remove_unshareable_info();
310
311 // nmethod/verified compiler entry
312 address verified_code_entry();
313 bool check_code() const; // Not inline to avoid circular ref
314 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
315 void clear_code(); // Clear out any compiled code
316 static void set_code(methodHandle mh, nmethod* code);
317 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
318 address get_i2c_entry();
319 address get_c2i_entry();
320 address get_c2i_unverified_entry();
321 AdapterHandlerEntry* adapter() { return _adapter; }
322 // setup entry points
323 void link_method(methodHandle method, TRAPS);
324 // clear entry points. Used by sharing code
325 void unlink_method();
326
327 // vtable index
328 enum VtableIndexFlag {
329 // Valid vtable indexes are non-negative (>= 0).
330 // These few negative values are used as sentinels.
331 highest_unused_vtable_index_value = -5,
332 invalid_vtable_index = -4, // distinct from any valid vtable index
333 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
334 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
335 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
336 };
337 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
338 int vtable_index() const { assert(valid_vtable_index(), "");
339 return _vtable_index; }
340 void set_vtable_index(int index) { _vtable_index = index; }
341
342 // interpreter entry
343 address interpreter_entry() const { return _i2i_entry; }
344 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
345 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
346 int interpreter_kind(void) {
347 return constMethod()->interpreter_kind();
348 }
349 void set_interpreter_kind();
350 void set_interpreter_kind(int kind) {
351 constMethod()->set_interpreter_kind(kind);
352 }
353
354 // native function (used for native methods only)
355 enum {
356 native_bind_event_is_interesting = true
357 };
358 address native_function() const { return *(native_function_addr()); }
359 // Must specify a real function (not NULL).
360 // Use clear_native_function() to unregister.
361 void set_native_function(address function, bool post_event_flag);
362 bool has_native_function() const;
363 void clear_native_function();
364
365 // signature handler (used for native methods only)
366 address signature_handler() const { return *(signature_handler_addr()); }
367 void set_signature_handler(address handler);
368
369 // Interpreter oopmap support
370 void mask_for(int bci, InterpreterOopMap* mask);
371
372 #ifndef PRODUCT
373 // operations on invocation counter
374 void print_invocation_count();
375 #endif
376
377 // byte codes
378 void set_code(address code) { return constMethod()->set_code(code); }
379 address code_base() const { return constMethod()->code_base(); }
380 bool contains(address bcp) const { return constMethod()->contains(bcp); }
381
382 // prints byte codes
383 void print_codes() const { print_codes_on(tty); }
384 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
385 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
386
387 // checked exceptions
388 int checked_exceptions_length() const
389 { return constMethod()->checked_exceptions_length(); }
390 CheckedExceptionElement* checked_exceptions_start() const
391 { return constMethod()->checked_exceptions_start(); }
392
393 // localvariable table
394 bool has_localvariable_table() const
395 { return constMethod()->has_localvariable_table(); }
396 int localvariable_table_length() const
397 { return constMethod()->localvariable_table_length(); }
398 LocalVariableTableElement* localvariable_table_start() const
399 { return constMethod()->localvariable_table_start(); }
400
401 bool has_linenumber_table() const
402 { return constMethod()->has_linenumber_table(); }
403 u_char* compressed_linenumber_table() const
404 { return constMethod()->compressed_linenumber_table(); }
405
406 // method holder (the klassOop holding this method)
407 klassOop method_holder() const { return _constants->pool_holder(); }
408
409 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
410 symbolOop klass_name() const; // returns the name of the method holder
411 BasicType result_type() const; // type of the method result
412 int result_type_index() const; // type index of the method result
413 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
414 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
415
416 // Checked exceptions thrown by this method (resolved to mirrors)
417 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
418
419 // Access flags
420 bool is_public() const { return access_flags().is_public(); }
421 bool is_private() const { return access_flags().is_private(); }
422 bool is_protected() const { return access_flags().is_protected(); }
423 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
424 bool is_static() const { return access_flags().is_static(); }
425 bool is_final() const { return access_flags().is_final(); }
426 bool is_synchronized() const { return access_flags().is_synchronized();}
427 bool is_native() const { return access_flags().is_native(); }
428 bool is_abstract() const { return access_flags().is_abstract(); }
429 bool is_strict() const { return access_flags().is_strict(); }
430 bool is_synthetic() const { return access_flags().is_synthetic(); }
431
432 // returns true if contains only return operation
433 bool is_empty_method() const;
434
435 // returns true if this is a vanilla constructor
436 bool is_vanilla_constructor() const;
437
438 // checks method and its method holder
439 bool is_final_method() const;
440 bool is_strict_method() const;
441
442 // true if method needs no dynamic dispatch (final and/or no vtable entry)
443 bool can_be_statically_bound() const;
444
445 // returns true if the method has any backward branches.
446 bool has_loops() {
447 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
448 };
449
450 bool compute_has_loops_flag();
451
452 bool has_jsrs() {
453 return access_flags().has_jsrs();
454 };
455 void set_has_jsrs() {
456 _access_flags.set_has_jsrs();
457 }
458
459 // returns true if the method has any monitors.
460 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
461 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
462
463 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
464
465 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
466 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
467 // has not been computed yet.
468 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
469 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
470
471 // returns true if the method is an accessor function (setter/getter).
472 bool is_accessor() const;
473
474 // returns true if the method is an initializer (<init> or <clinit>).
475 bool is_initializer() const;
476
477 // compiled code support
478 // NOTE: code() is inherently racy as deopt can be clearing code
479 // simultaneously. Use with caution.
480 bool has_compiled_code() const { return code() != NULL; }
481
482 // sizing
483 static int object_size(bool is_native);
484 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; }
485 int object_size() const { return method_size(); }
486
487 bool object_is_parsable() const { return method_size() > 0; }
488
489 // interpreter support
490 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); }
491 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); }
492 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); }
493 #ifdef CC_INTERP
494 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); }
495 #endif /* CC_INTERP */
496 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); }
497 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); }
498 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); }
499 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); }
500 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); }
501 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); }
502 static ByteSize method_data_offset() {
503 return byte_offset_of(methodOopDesc, _method_data);
504 }
505 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); }
506 #ifndef PRODUCT
507 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); }
508 #endif // not PRODUCT
509 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); }
510 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); }
511 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); }
512 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); }
513 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); }
514
515 // for code generation
516 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); }
517 static int interpreter_invocation_counter_offset_in_bytes()
518 { return offset_of(methodOopDesc, _interpreter_invocation_count); }
519 static int intrinsic_id_offset_in_bytes() { return offset_of(methodOopDesc, _intrinsic_id); }
520 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
521
522 // Static methods that are used to implement member methods where an exposed this pointer
523 // is needed due to possible GCs
524 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS);
525
526 // Returns the byte code index from the byte code pointer
527 int bci_from(address bcp) const;
528 address bcp_from(int bci) const;
529 int validate_bci_from_bcx(intptr_t bcx) const;
530
531 // Returns the line number for a bci if debugging information for the method is prowided,
532 // -1 is returned otherwise.
533 int line_number_from_bci(int bci) const;
534
535 // Reflection support
536 bool is_overridden_in(klassOop k) const;
537
538 // JSR 292 support
539 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); }
540 static bool is_method_handle_invoke_name(vmSymbols::SID name_sid);
541 static bool is_method_handle_invoke_name(symbolOop name) {
542 return is_method_handle_invoke_name(vmSymbols::find_sid(name));
543 }
544 // Tests if this method is an internal adapter frame from the
545 // MethodHandleCompiler.
546 bool is_method_handle_adapter() const;
547 static methodHandle make_invoke_method(KlassHandle holder,
548 symbolHandle name, //invokeExact or invokeGeneric
549 symbolHandle signature, //anything at all
550 Handle method_type,
551 TRAPS);
552 // these operate only on invoke methods:
553 oop method_handle_type() const;
554 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1
555 // presize interpreter frames for extra interpreter stack entries, if needed
556 // method handles want to be able to push a few extra values (e.g., a bound receiver), and
557 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
558 // all without checking for a stack overflow
559 static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); }
560 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize()
561
562 // RedefineClasses() support:
563 bool is_old() const { return access_flags().is_old(); }
564 void set_is_old() { _access_flags.set_is_old(); }
565 bool is_obsolete() const { return access_flags().is_obsolete(); }
566 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
567 // see the definition in methodOop.cpp for the gory details
568 bool should_not_be_cached() const;
569
570 // JVMTI Native method prefixing support:
571 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
572 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
573
574 // Rewriting support
575 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
576 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
577
578 // Get this method's jmethodID -- allocate if it doesn't exist
579 jmethodID jmethod_id() { methodHandle this_h(this);
580 return instanceKlass::get_jmethod_id(method_holder(), this_h); }
581
582 // Lookup the jmethodID for this method. Return NULL if not found.
583 // NOTE that this function can be called from a signal handler
584 // (see AsyncGetCallTrace support for Forte Analyzer) and this
585 // needs to be async-safe. No allocation should be done and
586 // so handles are not used to avoid deadlock.
587 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
588
589 // JNI static invoke cached itable index accessors
590 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
591 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
592
593 // Support for inlining of intrinsic methods
594 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
595 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
596
597 // Helper routines for intrinsic_id() and vmIntrinsics::method().
598 void init_intrinsic_id(); // updates from _none if a match
599 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder);
600
601 // On-stack replacement support
602 bool has_osr_nmethod(int level, bool match_level) {
603 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
604 }
605
606 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
607 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level);
608 }
609
610 // Inline cache support
611 void cleanup_inline_caches();
612
613 // Find if klass for method is loaded
614 bool is_klass_loaded_by_klass_index(int klass_index) const;
615 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
616
617 // Indicates whether compilation failed earlier for this method, or
618 // whether it is not compilable for another reason like having a
619 // breakpoint set in it.
620 bool is_not_compilable(int comp_level = CompLevel_any) const;
621 void set_not_compilable(int comp_level = CompLevel_all, bool report = true);
622 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
623 set_not_compilable(comp_level, false);
624 }
625 bool is_not_osr_compilable(int comp_level = CompLevel_any) const {
626 return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable();
627 }
628 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); }
629 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
630 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
631 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
632 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
633
634 // Background compilation support
635 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
636 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
637 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
638
639 static methodOop method_from_bcp(address bcp);
640
641 // Resolve all classes in signature, return 'true' if successful
642 static bool load_signature_classes(methodHandle m, TRAPS);
643
644 // Return if true if not all classes references in signature, including return type, has been loaded
645 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
646
647 // Printing
648 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
649 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)"
650
651 // Helper routine used for method sorting
652 static void sort_methods(objArrayOop methods,
653 objArrayOop methods_annotations,
654 objArrayOop methods_parameter_annotations,
655 objArrayOop methods_default_annotations,
656 bool idempotent = false);
657
658 // size of parameters
659 void set_size_of_parameters(int size) { _size_of_parameters = size; }
660 private:
661
662 // Inlined elements
663 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
664 address* signature_handler_addr() const { return native_function_addr() + 1; }
665
666 // Garbage collection support
667 oop* adr_constMethod() const { return (oop*)&_constMethod; }
668 oop* adr_constants() const { return (oop*)&_constants; }
669 oop* adr_method_data() const { return (oop*)&_method_data; }
670 };
671
672
673 // Utility class for compressing line number tables
674
675 class CompressedLineNumberWriteStream: public CompressedWriteStream {
676 private:
677 int _bci;
678 int _line;
679 public:
680 // Constructor
681 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
682 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
683
684 // Write (bci, line number) pair to stream
685 void write_pair_regular(int bci_delta, int line_delta);
686
687 inline void write_pair_inline(int bci, int line) {
688 int bci_delta = bci - _bci;
689 int line_delta = line - _line;
690 _bci = bci;
691 _line = line;
692 // Skip (0,0) deltas - they do not add information and conflict with terminator.
693 if (bci_delta == 0 && line_delta == 0) return;
694 // Check if bci is 5-bit and line number 3-bit unsigned.
695 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
696 // Compress into single byte.
697 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
698 // Check that value doesn't match escape character.
699 if (value != 0xFF) {
700 write_byte(value);
701 return;
702 }
703 }
704 write_pair_regular(bci_delta, line_delta);
705 }
706
707 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
708 // Disabling optimization doesn't work for methods in header files
709 // so we force it to call through the non-optimized version in the .cpp.
710 // It's gross, but it's the only way we can ensure that all callers are
711 // fixed. MSC_VER is defined in build/windows/makefiles/compile.make.
712 #if defined(_M_AMD64) && MSC_VER >= 1400
713 void write_pair(int bci, int line);
714 #else
715 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
716 #endif
717
718 // Write end-of-stream marker
719 void write_terminator() { write_byte(0); }
720 };
721
722
723 // Utility class for decompressing line number tables
724
725 class CompressedLineNumberReadStream: public CompressedReadStream {
726 private:
727 int _bci;
728 int _line;
729 public:
730 // Constructor
731 CompressedLineNumberReadStream(u_char* buffer);
732 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
733 bool read_pair();
734 // Accessing bci and line number (after calling read_pair)
735 int bci() const { return _bci; }
736 int line() const { return _line; }
737 };
738
739
740 /// Fast Breakpoints.
741
742 // If this structure gets more complicated (because bpts get numerous),
743 // move it into its own header.
744
745 // There is presently no provision for concurrent access
746 // to breakpoint lists, which is only OK for JVMTI because
747 // breakpoints are written only at safepoints, and are read
748 // concurrently only outside of safepoints.
749
750 class BreakpointInfo : public CHeapObj {
751 friend class VMStructs;
752 private:
753 Bytecodes::Code _orig_bytecode;
754 int _bci;
755 u2 _name_index; // of method
756 u2 _signature_index; // of method
757 BreakpointInfo* _next; // simple storage allocation
758
759 public:
760 BreakpointInfo(methodOop m, int bci);
761
762 // accessors
763 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
764 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
765 int bci() { return _bci; }
766
767 BreakpointInfo* next() const { return _next; }
768 void set_next(BreakpointInfo* n) { _next = n; }
769
770 // helps for searchers
771 bool match(methodOop m, int bci) {
772 return bci == _bci && match(m);
773 }
774
775 bool match(methodOop m) {
776 return _name_index == m->name_index() &&
777 _signature_index == m->signature_index();
778 }
779
780 void set(methodOop method);
781 void clear(methodOop method);
782 };