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comparison src/share/vm/oops/methodOop.hpp @ 0:a61af66fc99e jdk7-b24

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date Sat, 01 Dec 2007 00:00:00 +0000
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1 /*
2 * Copyright 1997-2007 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any 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, highest_tier | (unused) |
66 // |------------------------------------------------------|
67 // | throwout_count | num_breakpoints |
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
87 class methodDataOopDesc;
88
89 class methodOopDesc : public oopDesc {
90 friend class methodKlass;
91 friend class VMStructs;
92 private:
93 constMethodOop _constMethod; // Method read-only data.
94 constantPoolOop _constants; // Constant pool
95 methodDataOop _method_data;
96 int _interpreter_invocation_count; // Count of times invoked
97 AccessFlags _access_flags; // Access flags
98 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
99 // note: can have vtables with >2**16 elements (because of inheritance)
100 #ifdef CC_INTERP
101 int _result_index; // C++ interpreter needs for converting results to/from stack
102 #endif
103 u2 _method_size; // size of this object
104 u2 _max_stack; // Maximum number of entries on the expression stack
105 u2 _max_locals; // Number of local variables used by this method
106 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
107 u1 _intrinsic_id_cache; // Cache for intrinsic_id; 0 or 1+vmInt::ID
108 u1 _highest_tier_compile; // Highest compile level this method has ever seen.
109 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
110 u2 _number_of_breakpoints; // fullspeed debugging support
111 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
112 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
113 #ifndef PRODUCT
114 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
115 #endif
116 // Entry point for calling both from and to the interpreter.
117 address _i2i_entry; // All-args-on-stack calling convention
118 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked.
119 AdapterHandlerEntry* _adapter;
120 // Entry point for calling from compiled code, to compiled code if it exists
121 // or else the interpreter.
122 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
123 // The entry point for calling both from and to compiled code is
124 // "_code->entry_point()". Because of tiered compilation and de-opt, this
125 // field can come and go. It can transition from NULL to not-null at any
126 // time (whenever a compile completes). It can transition from not-null to
127 // NULL only at safepoints (because of a de-opt).
128 nmethod* volatile _code; // Points to the corresponding piece of native code
129 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
130
131 public:
132 // accessors for instance variables
133 constMethodOop constMethod() const { return _constMethod; }
134 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); }
135
136
137 static address make_adapters(methodHandle mh, TRAPS);
138 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
139 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
140
141 // access flag
142 AccessFlags access_flags() const { return _access_flags; }
143 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
144
145 // name
146 symbolOop name() const { return _constants->symbol_at(name_index()); }
147 int name_index() const { return constMethod()->name_index(); }
148 void set_name_index(int index) { constMethod()->set_name_index(index); }
149
150 // signature
151 symbolOop signature() const { return _constants->symbol_at(signature_index()); }
152 int signature_index() const { return constMethod()->signature_index(); }
153 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
154
155 // generics support
156 symbolOop generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); }
157 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
158 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
159
160 // annotations support
161 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); }
162 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); }
163 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); }
164
165 #ifdef CC_INTERP
166 void set_result_index(BasicType type);
167 int result_index() { return _result_index; }
168 #endif
169
170 // Helper routine: get klass name + "." + method name + signature as
171 // C string, for the purpose of providing more useful NoSuchMethodErrors
172 // and fatal error handling. The string is allocated in resource
173 // area if a buffer is not provided by the caller.
174 char* name_and_sig_as_C_string();
175 char* name_and_sig_as_C_string(char* buf, int size);
176
177 // Static routine in the situations we don't have a methodOop
178 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature);
179 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size);
180
181 // JVMTI breakpoints
182 Bytecodes::Code orig_bytecode_at(int bci);
183 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
184 void set_breakpoint(int bci);
185 void clear_breakpoint(int bci);
186 void clear_all_breakpoints();
187 // Tracking number of breakpoints, for fullspeed debugging.
188 // Only mutated by VM thread.
189 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
190 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
191 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
192 // Initialization only
193 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
194
195 // index into instanceKlass methods() array
196 u2 method_idnum() const { return constMethod()->method_idnum(); }
197 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
198
199 // code size
200 int code_size() const { return constMethod()->code_size(); }
201
202 // method size
203 int method_size() const { return _method_size; }
204 void set_method_size(int size) {
205 assert(0 <= size && size < (1 << 16), "invalid method size");
206 _method_size = size;
207 }
208
209 // constant pool for klassOop holding this method
210 constantPoolOop constants() const { return _constants; }
211 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); }
212
213 // max stack
214 int max_stack() const { return _max_stack; }
215 void set_max_stack(int size) { _max_stack = size; }
216
217 // max locals
218 int max_locals() const { return _max_locals; }
219 void set_max_locals(int size) { _max_locals = size; }
220 int highest_tier_compile() { return _highest_tier_compile;}
221 void set_highest_tier_compile(int level) { _highest_tier_compile = level;}
222
223 void clear_intrinsic_id_cache() { _intrinsic_id_cache = 0; }
224
225 // Count of times method was exited via exception while interpreting
226 void interpreter_throwout_increment() {
227 if (_interpreter_throwout_count < 65534) {
228 _interpreter_throwout_count++;
229 }
230 }
231
232 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
233 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
234
235 // size of parameters
236 int size_of_parameters() const { return _size_of_parameters; }
237
238 bool has_stackmap_table() const {
239 return constMethod()->has_stackmap_table();
240 }
241
242 typeArrayOop stackmap_data() const {
243 return constMethod()->stackmap_data();
244 }
245
246 // exception handler table
247 typeArrayOop exception_table() const
248 { return constMethod()->exception_table(); }
249 void set_exception_table(typeArrayOop e)
250 { constMethod()->set_exception_table(e); }
251 bool has_exception_handler() const
252 { return constMethod()->has_exception_handler(); }
253
254 // Finds the first entry point bci of an exception handler for an
255 // exception of klass ex_klass thrown at throw_bci. A value of NULL
256 // for ex_klass indicates that the exception klass is not known; in
257 // this case it matches any constraint class. Returns -1 if the
258 // exception cannot be handled in this method. The handler
259 // constraint classes are loaded if necessary. Note that this may
260 // throw an exception if loading of the constraint classes causes
261 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
262 // If an exception is thrown, returns the bci of the
263 // exception handler which caused the exception to be thrown, which
264 // is needed for proper retries. See, for example,
265 // InterpreterRuntime::exception_handler_for_exception.
266 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
267
268 // method data access
269 methodDataOop method_data() const {
270 return _method_data;
271 }
272 void set_method_data(methodDataOop data) {
273 oop_store_without_check((oop*)&_method_data, (oop)data);
274 }
275
276 // invocation counter
277 InvocationCounter* invocation_counter() { return &_invocation_counter; }
278 InvocationCounter* backedge_counter() { return &_backedge_counter; }
279 int invocation_count() const { return _invocation_counter.count(); }
280 int backedge_count() const { return _backedge_counter.count(); }
281 bool was_executed_more_than(int n) const;
282 bool was_never_executed() const { return !was_executed_more_than(0); }
283
284 static void build_interpreter_method_data(methodHandle method, TRAPS);
285
286 int interpreter_invocation_count() const { return _interpreter_invocation_count; }
287 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
288 int increment_interpreter_invocation_count() { return ++_interpreter_invocation_count; }
289
290 #ifndef PRODUCT
291 int compiled_invocation_count() const { return _compiled_invocation_count; }
292 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
293 #endif // not PRODUCT
294
295 // Clear (non-shared space) pointers which could not be relevent
296 // if this (shared) method were mapped into another JVM.
297 void remove_unshareable_info();
298
299 // nmethod/verified compiler entry
300 address verified_code_entry();
301 bool check_code() const; // Not inline to avoid circular ref
302 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
303 void clear_code(); // Clear out any compiled code
304 void set_code(methodHandle mh, nmethod* code);
305 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
306 address get_i2c_entry();
307 address get_c2i_entry();
308 address get_c2i_unverified_entry();
309 AdapterHandlerEntry* adapter() { return _adapter; }
310 // setup entry points
311 void link_method(methodHandle method, TRAPS);
312 // clear entry points. Used by sharing code
313 void unlink_method();
314
315 // vtable index
316 enum VtableIndexFlag {
317 // Valid vtable indexes are non-negative (>= 0).
318 // These few negative values are used as sentinels.
319 invalid_vtable_index = -4, // distinct from any valid vtable index
320 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
321 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
322 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
323 };
324 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
325 int vtable_index() const { assert(valid_vtable_index(), "");
326 return _vtable_index; }
327 void set_vtable_index(int index) { _vtable_index = index; }
328
329 // interpreter entry
330 address interpreter_entry() const { return _i2i_entry; }
331 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
332 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
333 int interpreter_kind(void) {
334 return constMethod()->interpreter_kind();
335 }
336 void set_interpreter_kind();
337 void set_interpreter_kind(int kind) {
338 constMethod()->set_interpreter_kind(kind);
339 }
340
341 // native function (used for native methods only)
342 enum {
343 native_bind_event_is_interesting = true
344 };
345 address native_function() const { return *(native_function_addr()); }
346 // Must specify a real function (not NULL).
347 // Use clear_native_function() to unregister.
348 void set_native_function(address function, bool post_event_flag);
349 bool has_native_function() const;
350 void clear_native_function();
351
352 // signature handler (used for native methods only)
353 address signature_handler() const { return *(signature_handler_addr()); }
354 void set_signature_handler(address handler);
355
356 // Interpreter oopmap support
357 void mask_for(int bci, InterpreterOopMap* mask);
358
359 #ifndef PRODUCT
360 // operations on invocation counter
361 void print_invocation_count() const;
362 #endif
363
364 // byte codes
365 address code_base() const { return constMethod()->code_base(); }
366 bool contains(address bcp) const { return constMethod()->contains(bcp); }
367
368 // prints byte codes
369 void print_codes() const { print_codes_on(tty); }
370 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
371 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
372
373 // checked exceptions
374 int checked_exceptions_length() const
375 { return constMethod()->checked_exceptions_length(); }
376 CheckedExceptionElement* checked_exceptions_start() const
377 { return constMethod()->checked_exceptions_start(); }
378
379 // localvariable table
380 bool has_localvariable_table() const
381 { return constMethod()->has_localvariable_table(); }
382 int localvariable_table_length() const
383 { return constMethod()->localvariable_table_length(); }
384 LocalVariableTableElement* localvariable_table_start() const
385 { return constMethod()->localvariable_table_start(); }
386
387 bool has_linenumber_table() const
388 { return constMethod()->has_linenumber_table(); }
389 u_char* compressed_linenumber_table() const
390 { return constMethod()->compressed_linenumber_table(); }
391
392 // method holder (the klassOop holding this method)
393 klassOop method_holder() const { return _constants->pool_holder(); }
394
395 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
396 symbolOop klass_name() const; // returns the name of the method holder
397 BasicType result_type() const; // type of the method result
398 int result_type_index() const; // type index of the method result
399 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
400 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
401
402 // Checked exceptions thrown by this method (resolved to mirrors)
403 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
404
405 // Access flags
406 bool is_public() const { return access_flags().is_public(); }
407 bool is_private() const { return access_flags().is_private(); }
408 bool is_protected() const { return access_flags().is_protected(); }
409 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
410 bool is_static() const { return access_flags().is_static(); }
411 bool is_final() const { return access_flags().is_final(); }
412 bool is_synchronized() const { return access_flags().is_synchronized();}
413 bool is_native() const { return access_flags().is_native(); }
414 bool is_abstract() const { return access_flags().is_abstract(); }
415 bool is_strict() const { return access_flags().is_strict(); }
416 bool is_synthetic() const { return access_flags().is_synthetic(); }
417
418 // returns true if contains only return operation
419 bool is_empty_method() const;
420
421 // returns true if this is a vanilla constructor
422 bool is_vanilla_constructor() const;
423
424 // checks method and its method holder
425 bool is_final_method() const;
426 bool is_strict_method() const;
427
428 // true if method needs no dynamic dispatch (final and/or no vtable entry)
429 bool can_be_statically_bound() const;
430
431 // returns true if the method has any backward branches.
432 bool has_loops() {
433 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
434 };
435
436 bool compute_has_loops_flag();
437
438 bool has_jsrs() {
439 return access_flags().has_jsrs();
440 };
441 void set_has_jsrs() {
442 _access_flags.set_has_jsrs();
443 }
444
445 // returns true if the method has any monitors.
446 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
447 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
448
449 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
450
451 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
452 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
453 // has not been computed yet.
454 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
455 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
456
457 // returns true if the method is an accessor function (setter/getter).
458 bool is_accessor() const;
459
460 // returns true if the method is an initializer (<init> or <clinit>).
461 bool is_initializer() const;
462
463 // compiled code support
464 // NOTE: code() is inherently racy as deopt can be clearing code
465 // simultaneously. Use with caution.
466 bool has_compiled_code() const { return code() != NULL; }
467
468 // sizing
469 static int object_size(bool is_native);
470 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; }
471 int object_size() const { return method_size(); }
472
473 bool object_is_parsable() const { return method_size() > 0; }
474
475 // interpreter support
476 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); }
477 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); }
478 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); }
479 #ifdef CC_INTERP
480 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); }
481 #endif /* CC_INTERP */
482 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); }
483 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); }
484 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); }
485 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); }
486 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); }
487 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); }
488 static ByteSize method_data_offset() {
489 return byte_offset_of(methodOopDesc, _method_data);
490 }
491 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); }
492 #ifndef PRODUCT
493 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); }
494 #endif // not PRODUCT
495 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); }
496 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); }
497 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); }
498 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); }
499 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); }
500
501 // for code generation
502 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); }
503 static int interpreter_invocation_counter_offset_in_bytes()
504 { return offset_of(methodOopDesc, _interpreter_invocation_count); }
505
506 // Static methods that are used to implement member methods where an exposed this pointer
507 // is needed due to possible GCs
508 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS);
509
510 // Returns the byte code index from the byte code pointer
511 int bci_from(address bcp) const;
512 address bcp_from(int bci) const;
513 int validate_bci_from_bcx(intptr_t bcx) const;
514
515 // Returns the line number for a bci if debugging information for the method is prowided,
516 // -1 is returned otherwise.
517 int line_number_from_bci(int bci) const;
518
519 // Reflection support
520 bool is_overridden_in(klassOop k) const;
521
522 // RedefineClasses() support:
523 bool is_old() const { return access_flags().is_old(); }
524 void set_is_old() { _access_flags.set_is_old(); }
525 bool is_obsolete() const { return access_flags().is_obsolete(); }
526 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
527
528 // JVMTI Native method prefixing support:
529 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
530 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
531
532 // Rewriting support
533 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
534 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
535
536 // Get this method's jmethodID -- allocate if it doesn't exist
537 jmethodID jmethod_id() { methodHandle this_h(this);
538 return instanceKlass::jmethod_id_for_impl(method_holder(), this_h); }
539
540 // Lookup the jmethodID for this method. Return NULL if not found.
541 // NOTE that this function can be called from a signal handler
542 // (see AsyncGetCallTrace support for Forte Analyzer) and this
543 // needs to be async-safe. No allocation should be done and
544 // so handles are not used to avoid deadlock.
545 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
546
547 // JNI static invoke cached itable index accessors
548 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
549 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
550
551 // Support for inlining of intrinsic methods
552 vmIntrinsics::ID intrinsic_id() const { // returns zero if not an intrinsic
553 const u1& cache = _intrinsic_id_cache;
554 if (cache != 0) {
555 return (vmIntrinsics::ID)(cache - 1);
556 } else {
557 vmIntrinsics::ID id = compute_intrinsic_id();
558 *(u1*)&cache = ((u1) id) + 1; // force the cache to be non-const
559 vmIntrinsics::verify_method(id, (methodOop) this);
560 assert((vmIntrinsics::ID)(cache - 1) == id, "proper conversion");
561 return id;
562 }
563 }
564
565 // On-stack replacement support
566 bool has_osr_nmethod() { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci) != NULL; }
567 nmethod* lookup_osr_nmethod_for(int bci) { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci); }
568
569 // Inline cache support
570 void cleanup_inline_caches();
571
572 // Find if klass for method is loaded
573 bool is_klass_loaded_by_klass_index(int klass_index) const;
574 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
575
576 // Indicates whether compilation failed earlier for this method, or
577 // whether it is not compilable for another reason like having a
578 // breakpoint set in it.
579 bool is_not_compilable(int comp_level = CompLevel_highest_tier) const;
580 void set_not_compilable(int comp_level = CompLevel_highest_tier);
581
582 bool is_not_osr_compilable() const { return is_not_compilable() || access_flags().is_not_osr_compilable(); }
583 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); }
584
585 bool is_not_tier1_compilable() const { return access_flags().is_not_tier1_compilable(); }
586 void set_not_tier1_compilable() { _access_flags.set_not_tier1_compilable(); }
587
588 // Background compilation support
589 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
590 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
591 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
592
593 static methodOop method_from_bcp(address bcp);
594
595 // Resolve all classes in signature, return 'true' if successful
596 static bool load_signature_classes(methodHandle m, TRAPS);
597
598 // Return if true if not all classes references in signature, including return type, has been loaded
599 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
600
601 // Printing
602 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
603 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)"
604
605 // Helper routine used for method sorting
606 static void sort_methods(objArrayOop methods,
607 objArrayOop methods_annotations,
608 objArrayOop methods_parameter_annotations,
609 objArrayOop methods_default_annotations,
610 bool idempotent = false);
611
612 // size of parameters
613 void set_size_of_parameters(int size) { _size_of_parameters = size; }
614 private:
615
616 // Helper routine for intrinsic_id().
617 vmIntrinsics::ID compute_intrinsic_id() const;
618
619 // Inlined elements
620 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
621 address* signature_handler_addr() const { return native_function_addr() + 1; }
622
623 // Garbage collection support
624 oop* adr_constMethod() const { return (oop*)&_constMethod; }
625 oop* adr_constants() const { return (oop*)&_constants; }
626 oop* adr_method_data() const { return (oop*)&_method_data; }
627 };
628
629
630 // Utility class for compressing line number tables
631
632 class CompressedLineNumberWriteStream: public CompressedWriteStream {
633 private:
634 int _bci;
635 int _line;
636 public:
637 // Constructor
638 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
639 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
640
641 // Write (bci, line number) pair to stream
642 void write_pair_regular(int bci_delta, int line_delta);
643
644 inline void write_pair_inline(int bci, int line) {
645 int bci_delta = bci - _bci;
646 int line_delta = line - _line;
647 _bci = bci;
648 _line = line;
649 // Skip (0,0) deltas - they do not add information and conflict with terminator.
650 if (bci_delta == 0 && line_delta == 0) return;
651 // Check if bci is 5-bit and line number 3-bit unsigned.
652 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
653 // Compress into single byte.
654 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
655 // Check that value doesn't match escape character.
656 if (value != 0xFF) {
657 write_byte(value);
658 return;
659 }
660 }
661 write_pair_regular(bci_delta, line_delta);
662 }
663
664 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
665 // Disabling optimization doesn't work for methods in header files
666 // so we force it to call through the non-optimized version in the .cpp.
667 // It's gross, but it's the only way we can ensure that all callers are
668 // fixed. MSC_VER is defined in build/windows/makefiles/compile.make.
669 #if defined(_M_AMD64) && MSC_VER >= 1400
670 void write_pair(int bci, int line);
671 #else
672 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
673 #endif
674
675 // Write end-of-stream marker
676 void write_terminator() { write_byte(0); }
677 };
678
679
680 // Utility class for decompressing line number tables
681
682 class CompressedLineNumberReadStream: public CompressedReadStream {
683 private:
684 int _bci;
685 int _line;
686 public:
687 // Constructor
688 CompressedLineNumberReadStream(u_char* buffer);
689 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
690 bool read_pair();
691 // Accessing bci and line number (after calling read_pair)
692 int bci() const { return _bci; }
693 int line() const { return _line; }
694 };
695
696
697 /// Fast Breakpoints.
698
699 // If this structure gets more complicated (because bpts get numerous),
700 // move it into its own header.
701
702 // There is presently no provision for concurrent access
703 // to breakpoint lists, which is only OK for JVMTI because
704 // breakpoints are written only at safepoints, and are read
705 // concurrently only outside of safepoints.
706
707 class BreakpointInfo : public CHeapObj {
708 friend class VMStructs;
709 private:
710 Bytecodes::Code _orig_bytecode;
711 int _bci;
712 u2 _name_index; // of method
713 u2 _signature_index; // of method
714 BreakpointInfo* _next; // simple storage allocation
715
716 public:
717 BreakpointInfo(methodOop m, int bci);
718
719 // accessors
720 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
721 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
722 int bci() { return _bci; }
723
724 BreakpointInfo* next() const { return _next; }
725 void set_next(BreakpointInfo* n) { _next = n; }
726
727 // helps for searchers
728 bool match(methodOop m, int bci) {
729 return bci == _bci && match(m);
730 }
731
732 bool match(methodOop m) {
733 return _name_index == m->name_index() &&
734 _signature_index == m->signature_index();
735 }
736
737 void set(methodOop method);
738 void clear(methodOop method);
739 };