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 // | code (pointer) |
88 // | i2i (pointer) |
89 // | adapter (pointer) |
90 // | from_compiled_entry (pointer) |
91 // | from_interpreted_entry (pointer) |
92 // |------------------------------------------------------|
93 // | native_function (present only if native) |
94 // | signature_handler (present only if native) |
95 // |------------------------------------------------------|
96
97
98 class CheckedExceptionElement;
99 class LocalVariableTableElement;
100 class AdapterHandlerEntry;
101 class methodDataOopDesc;
102
103 class methodOopDesc : public oopDesc {
104 friend class methodKlass;
105 friend class VMStructs;
106 private:
107 constMethodOop _constMethod; // Method read-only data.
108 constantPoolOop _constants; // Constant pool
109 methodDataOop _method_data;
110 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
111 AccessFlags _access_flags; // Access flags
112 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
113 // note: can have vtables with >2**16 elements (because of inheritance)
114 #ifdef CC_INTERP
115 int _result_index; // C++ interpreter needs for converting results to/from stack
116 #endif
117 u2 _method_size; // size of this object
118 u2 _max_stack; // Maximum number of entries on the expression stack
119 u2 _max_locals; // Number of local variables used by this method
120 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
121 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
122 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
123 u2 _number_of_breakpoints; // fullspeed debugging support
124 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
125 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
126
127 #ifndef PRODUCT
128 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
129 #endif
130 // Entry point for calling both from and to the interpreter.
131 address _i2i_entry; // All-args-on-stack calling convention
132 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked.
133 AdapterHandlerEntry* _adapter;
134 // Entry point for calling from compiled code, to compiled code if it exists
135 // or else the interpreter.
136 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
137 // The entry point for calling both from and to compiled code is
138 // "_code->entry_point()". Because of tiered compilation and de-opt, this
139 // field can come and go. It can transition from NULL to not-null at any
140 // time (whenever a compile completes). It can transition from not-null to
141 // NULL only at safepoints (because of a de-opt).
142 nmethod* volatile _code; // Points to the corresponding piece of native code
143 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
144
145 public:
146
147 static const bool IsUnsafeConc = false;
148 static const bool IsSafeConc = true;
149
150 // accessors for instance variables
151 constMethodOop constMethod() const { return _constMethod; }
152 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); }
153
154
155 static address make_adapters(methodHandle mh, TRAPS);
156 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
157 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
158
159 // access flag
160 AccessFlags access_flags() const { return _access_flags; }
161 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
162
163 // name
164 Symbol* name() const { return _constants->symbol_at(name_index()); }
165 int name_index() const { return constMethod()->name_index(); }
166 void set_name_index(int index) { constMethod()->set_name_index(index); }
167
168 // signature
169 Symbol* signature() const { return _constants->symbol_at(signature_index()); }
170 int signature_index() const { return constMethod()->signature_index(); }
171 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
172
173 // generics support
174 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (Symbol*)NULL); }
175 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
176 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
177
178 // annotations support
179 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); }
180 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); }
181 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); }
182
183 #ifdef CC_INTERP
184 void set_result_index(BasicType type);
185 int result_index() { return _result_index; }
186 #endif
187
188 // Helper routine: get klass name + "." + method name + signature as
189 // C string, for the purpose of providing more useful NoSuchMethodErrors
190 // and fatal error handling. The string is allocated in resource
191 // area if a buffer is not provided by the caller.
192 char* name_and_sig_as_C_string();
193 char* name_and_sig_as_C_string(char* buf, int size);
194
195 // Static routine in the situations we don't have a methodOop
196 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
197 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
198
199 Bytecodes::Code java_code_at(int bci) const {
200 return Bytecodes::java_code_at(this, bcp_from(bci));
201 }
202 Bytecodes::Code code_at(int bci) const {
203 return Bytecodes::code_at(this, bcp_from(bci));
204 }
205
206 // JVMTI breakpoints
207 Bytecodes::Code orig_bytecode_at(int bci) const;
208 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
209 void set_breakpoint(int bci);
210 void clear_breakpoint(int bci);
211 void clear_all_breakpoints();
212 // Tracking number of breakpoints, for fullspeed debugging.
213 // Only mutated by VM thread.
214 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
215 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
216 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
217 // Initialization only
218 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
219
220 // index into instanceKlass methods() array
221 u2 method_idnum() const { return constMethod()->method_idnum(); }
222 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
223
224 // code size
225 int code_size() const { return constMethod()->code_size(); }
226
227 // method size
228 int method_size() const { return _method_size; }
229 void set_method_size(int size) {
230 assert(0 <= size && size < (1 << 16), "invalid method size");
231 _method_size = size;
232 }
233
234 // constant pool for klassOop holding this method
235 constantPoolOop constants() const { return _constants; }
236 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); }
237
238 // max stack
239 int max_stack() const { return _max_stack; }
240 void set_max_stack(int size) { _max_stack = size; }
241
242 // max locals
243 int max_locals() const { return _max_locals; }
244 void set_max_locals(int size) { _max_locals = size; }
245
246 int highest_comp_level() const;
247 void set_highest_comp_level(int level);
248 int highest_osr_comp_level() const;
249 void set_highest_osr_comp_level(int level);
250
251 // Count of times method was exited via exception while interpreting
252 void interpreter_throwout_increment() {
253 if (_interpreter_throwout_count < 65534) {
254 _interpreter_throwout_count++;
255 }
256 }
257
258 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
259 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
260
261 // size of parameters
262 int size_of_parameters() const { return _size_of_parameters; }
263
264 bool has_stackmap_table() const {
265 return constMethod()->has_stackmap_table();
266 }
267
268 typeArrayOop stackmap_data() const {
269 return constMethod()->stackmap_data();
270 }
271
272 void set_stackmap_data(typeArrayOop sd) {
273 constMethod()->set_stackmap_data(sd);
274 }
275
276 // exception handler table
277 typeArrayOop exception_table() const
278 { return constMethod()->exception_table(); }
279 void set_exception_table(typeArrayOop e)
280 { constMethod()->set_exception_table(e); }
281 bool has_exception_handler() const
282 { return constMethod()->has_exception_handler(); }
283
284 // Finds the first entry point bci of an exception handler for an
285 // exception of klass ex_klass thrown at throw_bci. A value of NULL
286 // for ex_klass indicates that the exception klass is not known; in
287 // this case it matches any constraint class. Returns -1 if the
288 // exception cannot be handled in this method. The handler
289 // constraint classes are loaded if necessary. Note that this may
290 // throw an exception if loading of the constraint classes causes
291 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
292 // If an exception is thrown, returns the bci of the
293 // exception handler which caused the exception to be thrown, which
294 // is needed for proper retries. See, for example,
295 // InterpreterRuntime::exception_handler_for_exception.
296 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
297
298 // method data access
299 methodDataOop method_data() const {
300 return _method_data;
301 }
302 void set_method_data(methodDataOop data) {
303 oop_store_without_check((oop*)&_method_data, (oop)data);
304 }
305
306 // invocation counter
307 InvocationCounter* invocation_counter() { return &_invocation_counter; }
308 InvocationCounter* backedge_counter() { return &_backedge_counter; }
309
310 int invocation_count();
311 int backedge_count();
312
313 bool was_executed_more_than(int n);
314 bool was_never_executed() { return !was_executed_more_than(0); }
315
316 static void build_interpreter_method_data(methodHandle method, TRAPS);
317
318 int interpreter_invocation_count() {
319 if (TieredCompilation) return invocation_count();
320 else return _interpreter_invocation_count;
321 }
322 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
323 int increment_interpreter_invocation_count() {
324 if (TieredCompilation) ShouldNotReachHere();
325 return ++_interpreter_invocation_count;
326 }
327
328 #ifndef PRODUCT
329 int compiled_invocation_count() const { return _compiled_invocation_count; }
330 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
331 #endif // not PRODUCT
332
333 // Clear (non-shared space) pointers which could not be relevant
334 // if this (shared) method were mapped into another JVM.
335 void remove_unshareable_info();
336
337 // nmethod/verified compiler entry
338 address verified_code_entry();
339 bool check_code() const; // Not inline to avoid circular ref
340 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
341 void clear_code(); // Clear out any compiled code
342 static void set_code(methodHandle mh, nmethod* code);
343 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
344 address get_i2c_entry();
345 address get_c2i_entry();
346 address get_c2i_unverified_entry();
347 AdapterHandlerEntry* adapter() { return _adapter; }
348 // setup entry points
349 void link_method(methodHandle method, TRAPS);
350 // clear entry points. Used by sharing code
351 void unlink_method();
352
353 // vtable index
354 enum VtableIndexFlag {
355 // Valid vtable indexes are non-negative (>= 0).
356 // These few negative values are used as sentinels.
357 highest_unused_vtable_index_value = -5,
358 invalid_vtable_index = -4, // distinct from any valid vtable index
359 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
360 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
361 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
362 };
363 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
364 int vtable_index() const { assert(valid_vtable_index(), "");
365 return _vtable_index; }
366 void set_vtable_index(int index) { _vtable_index = index; }
367
368 // interpreter entry
369 address interpreter_entry() const { return _i2i_entry; }
370 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
371 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
372 int interpreter_kind(void) {
373 return constMethod()->interpreter_kind();
374 }
375 void set_interpreter_kind();
376 void set_interpreter_kind(int kind) {
377 constMethod()->set_interpreter_kind(kind);
378 }
379
380 // native function (used for native methods only)
381 enum {
382 native_bind_event_is_interesting = true
383 };
384 address native_function() const { return *(native_function_addr()); }
385 // Must specify a real function (not NULL).
386 // Use clear_native_function() to unregister.
387 void set_native_function(address function, bool post_event_flag);
388 bool has_native_function() const;
389 void clear_native_function();
390
391 // signature handler (used for native methods only)
392 address signature_handler() const { return *(signature_handler_addr()); }
393 void set_signature_handler(address handler);
394
395 // Interpreter oopmap support
396 void mask_for(int bci, InterpreterOopMap* mask);
397
398 #ifndef PRODUCT
399 // operations on invocation counter
400 void print_invocation_count();
401 #endif
402
403 // byte codes
404 void set_code(address code) { return constMethod()->set_code(code); }
405 address code_base() const { return constMethod()->code_base(); }
406 bool contains(address bcp) const { return constMethod()->contains(bcp); }
407
408 // prints byte codes
409 void print_codes() const { print_codes_on(tty); }
410 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
411 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
412
413 // checked exceptions
414 int checked_exceptions_length() const
415 { return constMethod()->checked_exceptions_length(); }
416 CheckedExceptionElement* checked_exceptions_start() const
417 { return constMethod()->checked_exceptions_start(); }
418
419 // localvariable table
420 bool has_localvariable_table() const
421 { return constMethod()->has_localvariable_table(); }
422 int localvariable_table_length() const
423 { return constMethod()->localvariable_table_length(); }
424 LocalVariableTableElement* localvariable_table_start() const
425 { return constMethod()->localvariable_table_start(); }
426
427 bool has_linenumber_table() const
428 { return constMethod()->has_linenumber_table(); }
429 u_char* compressed_linenumber_table() const
430 { return constMethod()->compressed_linenumber_table(); }
431
432 // method holder (the klassOop holding this method)
433 klassOop method_holder() const { return _constants->pool_holder(); }
434
435 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
436 Symbol* klass_name() const; // returns the name of the method holder
437 BasicType result_type() const; // type of the method result
438 int result_type_index() const; // type index of the method result
439 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
440 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
441
442 // Checked exceptions thrown by this method (resolved to mirrors)
443 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
444
445 // Access flags
446 bool is_public() const { return access_flags().is_public(); }
447 bool is_private() const { return access_flags().is_private(); }
448 bool is_protected() const { return access_flags().is_protected(); }
449 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
450 bool is_static() const { return access_flags().is_static(); }
451 bool is_final() const { return access_flags().is_final(); }
452 bool is_synchronized() const { return access_flags().is_synchronized();}
453 bool is_native() const { return access_flags().is_native(); }
454 bool is_abstract() const { return access_flags().is_abstract(); }
455 bool is_strict() const { return access_flags().is_strict(); }
456 bool is_synthetic() const { return access_flags().is_synthetic(); }
457
458 // returns true if contains only return operation
459 bool is_empty_method() const;
460
461 // returns true if this is a vanilla constructor
462 bool is_vanilla_constructor() const;
463
464 // checks method and its method holder
465 bool is_final_method() const;
466 bool is_strict_method() const;
467
468 // true if method needs no dynamic dispatch (final and/or no vtable entry)
469 bool can_be_statically_bound() const;
470
471 // returns true if the method has any backward branches.
472 bool has_loops() {
473 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
474 };
475
476 bool compute_has_loops_flag();
477
478 bool has_jsrs() {
479 return access_flags().has_jsrs();
480 };
481 void set_has_jsrs() {
482 _access_flags.set_has_jsrs();
483 }
484
485 // returns true if the method has any monitors.
486 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
487 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
488
489 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
490
491 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
492 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
493 // has not been computed yet.
494 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
495 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
496
497 // returns true if the method is an accessor function (setter/getter).
498 bool is_accessor() const;
499
500 // returns true if the method is an initializer (<init> or <clinit>).
501 bool is_initializer() const;
502
503 // compiled code support
504 // NOTE: code() is inherently racy as deopt can be clearing code
505 // simultaneously. Use with caution.
506 bool has_compiled_code() const { return code() != NULL; }
507
508 // sizing
509 static int object_size(bool is_native);
510 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; }
511 int object_size() const { return method_size(); }
512
513 bool object_is_parsable() const { return method_size() > 0; }
514
515 // interpreter support
516 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); }
517 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); }
518 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); }
519 #ifdef CC_INTERP
520 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); }
521 #endif /* CC_INTERP */
522 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); }
523 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); }
524 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); }
525 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); }
526 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); }
527 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); }
528 static ByteSize method_data_offset() {
529 return byte_offset_of(methodOopDesc, _method_data);
530 }
531 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); }
532 #ifndef PRODUCT
533 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); }
534 #endif // not PRODUCT
535 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); }
536 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); }
537 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); }
538 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); }
539 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); }
540
541 // for code generation
542 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); }
543 static int interpreter_invocation_counter_offset_in_bytes()
544 { return offset_of(methodOopDesc, _interpreter_invocation_count); }
545 static int intrinsic_id_offset_in_bytes() { return offset_of(methodOopDesc, _intrinsic_id); }
546 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
547
548 // Static methods that are used to implement member methods where an exposed this pointer
549 // is needed due to possible GCs
550 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS);
551
552 // Returns the byte code index from the byte code pointer
553 int bci_from(address bcp) const;
554 address bcp_from(int bci) const;
555 int validate_bci_from_bcx(intptr_t bcx) const;
556
557 // Returns the line number for a bci if debugging information for the method is prowided,
558 // -1 is returned otherwise.
559 int line_number_from_bci(int bci) const;
560
561 // Reflection support
562 bool is_overridden_in(klassOop k) const;
563
564 // JSR 292 support
565 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); }
566 static bool is_method_handle_invoke_name(vmSymbols::SID name_sid);
567 static bool is_method_handle_invoke_name(Symbol* name) {
568 return is_method_handle_invoke_name(vmSymbols::find_sid(name));
569 }
570 // Tests if this method is an internal adapter frame from the
571 // MethodHandleCompiler.
572 bool is_method_handle_adapter() const;
573 static methodHandle make_invoke_method(KlassHandle holder,
574 Symbol* name, //invokeExact or invokeGeneric
575 Symbol* signature, //anything at all
576 Handle method_type,
577 TRAPS);
578 // these operate only on invoke methods:
579 oop method_handle_type() const;
580 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1
581 // presize interpreter frames for extra interpreter stack entries, if needed
582 // method handles want to be able to push a few extra values (e.g., a bound receiver), and
583 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
584 // all without checking for a stack overflow
585 static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); }
586 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize()
587
588 // RedefineClasses() support:
589 bool is_old() const { return access_flags().is_old(); }
590 void set_is_old() { _access_flags.set_is_old(); }
591 bool is_obsolete() const { return access_flags().is_obsolete(); }
592 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
593 // see the definition in methodOop.cpp for the gory details
594 bool should_not_be_cached() const;
595
596 // JVMTI Native method prefixing support:
597 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
598 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
599
600 // Rewriting support
601 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
602 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
603
604 // Get this method's jmethodID -- allocate if it doesn't exist
605 jmethodID jmethod_id() { methodHandle this_h(this);
606 return instanceKlass::get_jmethod_id(method_holder(), this_h); }
607
608 // Lookup the jmethodID for this method. Return NULL if not found.
609 // NOTE that this function can be called from a signal handler
610 // (see AsyncGetCallTrace support for Forte Analyzer) and this
611 // needs to be async-safe. No allocation should be done and
612 // so handles are not used to avoid deadlock.
613 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
614
615 // JNI static invoke cached itable index accessors
616 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
617 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
618
619 // Support for inlining of intrinsic methods
620 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
621 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
622
623 // Helper routines for intrinsic_id() and vmIntrinsics::method().
624 void init_intrinsic_id(); // updates from _none if a match
625 static vmSymbols::SID klass_id_for_intrinsics(klassOop holder);
626
627 // On-stack replacement support
628 bool has_osr_nmethod(int level, bool match_level) {
629 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
630 }
631
632 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
633 return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level);
634 }
635
636 // Inline cache support
637 void cleanup_inline_caches();
638
639 // Find if klass for method is loaded
640 bool is_klass_loaded_by_klass_index(int klass_index) const;
641 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
642
643 // Indicates whether compilation failed earlier for this method, or
644 // whether it is not compilable for another reason like having a
645 // breakpoint set in it.
646 bool is_not_compilable(int comp_level = CompLevel_any) const;
647 void set_not_compilable(int comp_level = CompLevel_all, bool report = true);
648 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
649 set_not_compilable(comp_level, false);
650 }
651 bool is_not_osr_compilable(int comp_level = CompLevel_any) const {
652 return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable();
653 }
654 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); }
655 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
656 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
657 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
658 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
659
660 // Background compilation support
661 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
662 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
663 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
664
665 // Resolve all classes in signature, return 'true' if successful
666 static bool load_signature_classes(methodHandle m, TRAPS);
667
668 // Return if true if not all classes references in signature, including return type, has been loaded
669 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
670
671 // Printing
672 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
673 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)"
674
675 // Helper routine used for method sorting
676 static void sort_methods(objArrayOop methods,
677 objArrayOop methods_annotations,
678 objArrayOop methods_parameter_annotations,
679 objArrayOop methods_default_annotations,
680 bool idempotent = false);
681
682 // size of parameters
683 void set_size_of_parameters(int size) { _size_of_parameters = size; }
684 private:
685
686 // Inlined elements
687 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
688 address* signature_handler_addr() const { return native_function_addr() + 1; }
689
690 // Garbage collection support
691 oop* adr_constMethod() const { return (oop*)&_constMethod; }
692 oop* adr_constants() const { return (oop*)&_constants; }
693 oop* adr_method_data() const { return (oop*)&_method_data; }
694 };
695
696
697 // Utility class for compressing line number tables
698
699 class CompressedLineNumberWriteStream: public CompressedWriteStream {
700 private:
701 int _bci;
702 int _line;
703 public:
704 // Constructor
705 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
706 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
707
708 // Write (bci, line number) pair to stream
709 void write_pair_regular(int bci_delta, int line_delta);
710
711 inline void write_pair_inline(int bci, int line) {
712 int bci_delta = bci - _bci;
713 int line_delta = line - _line;
714 _bci = bci;
715 _line = line;
716 // Skip (0,0) deltas - they do not add information and conflict with terminator.
717 if (bci_delta == 0 && line_delta == 0) return;
718 // Check if bci is 5-bit and line number 3-bit unsigned.
719 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
720 // Compress into single byte.
721 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
722 // Check that value doesn't match escape character.
723 if (value != 0xFF) {
724 write_byte(value);
725 return;
726 }
727 }
728 write_pair_regular(bci_delta, line_delta);
729 }
730
731 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
732 // Disabling optimization doesn't work for methods in header files
733 // so we force it to call through the non-optimized version in the .cpp.
734 // It's gross, but it's the only way we can ensure that all callers are
735 // fixed. _MSC_VER is defined by the windows compiler
736 #if defined(_M_AMD64) && _MSC_VER >= 1400
737 void write_pair(int bci, int line);
738 #else
739 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
740 #endif
741
742 // Write end-of-stream marker
743 void write_terminator() { write_byte(0); }
744 };
745
746
747 // Utility class for decompressing line number tables
748
749 class CompressedLineNumberReadStream: public CompressedReadStream {
750 private:
751 int _bci;
752 int _line;
753 public:
754 // Constructor
755 CompressedLineNumberReadStream(u_char* buffer);
756 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
757 bool read_pair();
758 // Accessing bci and line number (after calling read_pair)
759 int bci() const { return _bci; }
760 int line() const { return _line; }
761 };
762
763
764 /// Fast Breakpoints.
765
766 // If this structure gets more complicated (because bpts get numerous),
767 // move it into its own header.
768
769 // There is presently no provision for concurrent access
770 // to breakpoint lists, which is only OK for JVMTI because
771 // breakpoints are written only at safepoints, and are read
772 // concurrently only outside of safepoints.
773
774 class BreakpointInfo : public CHeapObj {
775 friend class VMStructs;
776 private:
777 Bytecodes::Code _orig_bytecode;
778 int _bci;
779 u2 _name_index; // of method
780 u2 _signature_index; // of method
781 BreakpointInfo* _next; // simple storage allocation
782
783 public:
784 BreakpointInfo(methodOop m, int bci);
785
786 // accessors
787 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
788 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
789 int bci() { return _bci; }
790
791 BreakpointInfo* next() const { return _next; }
792 void set_next(BreakpointInfo* n) { _next = n; }
793
794 // helps for searchers
795 bool match(const methodOopDesc* m, int bci) {
796 return bci == _bci && match(m);
797 }
798
799 bool match(const methodOopDesc* m) {
800 return _name_index == m->name_index() &&
801 _signature_index == m->signature_index();
802 }
803
804 void set(methodOop method);
805 void clear(methodOop method);
806 };
807
808 #endif // SHARE_VM_OOPS_METHODOOP_HPP