Thu, 20 Dec 2012 10:22:19 +0100
8004823: Add VM support for type annotation reflection
Reviewed-by: dholmes, coleenp
Contributed-by: joel.franck@oracle.com
1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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5 * This code is free software; you can redistribute it and/or modify it
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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13 * accompanied this code).
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25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP
26 #define SHARE_VM_OOPS_METHODOOP_HPP
28 #include "classfile/vmSymbols.hpp"
29 #include "code/compressedStream.hpp"
30 #include "compiler/oopMap.hpp"
31 #include "interpreter/invocationCounter.hpp"
32 #include "oops/annotations.hpp"
33 #include "oops/constantPool.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"
40 // A Method* 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 Method 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 // | ConstMethod* (oop) |
67 // |------------------------------------------------------|
68 // | methodData (oop) |
69 // | interp_invocation_count |
70 // |------------------------------------------------------|
71 // | access_flags |
72 // | vtable_index |
73 // |------------------------------------------------------|
74 // | result_index (C++ interpreter only) |
75 // |------------------------------------------------------|
76 // | method_size | max_locals |
77 // | size_of_parameters | intrinsic_id| flags |
78 // |------------------------------------------------------|
79 // | throwout_count | num_breakpoints |
80 // |------------------------------------------------------|
81 // | invocation_counter |
82 // | backedge_counter |
83 // |------------------------------------------------------|
84 // | prev_time (tiered only, 64 bit wide) |
85 // | |
86 // |------------------------------------------------------|
87 // | rate (tiered) |
88 // |------------------------------------------------------|
89 // | code (pointer) |
90 // | i2i (pointer) |
91 // | adapter (pointer) |
92 // | from_compiled_entry (pointer) |
93 // | from_interpreted_entry (pointer) |
94 // |------------------------------------------------------|
95 // | native_function (present only if native) |
96 // | signature_handler (present only if native) |
97 // |------------------------------------------------------|
100 class CheckedExceptionElement;
101 class LocalVariableTableElement;
102 class AdapterHandlerEntry;
103 class MethodData;
104 class ConstMethod;
106 class Method : public Metadata {
107 friend class VMStructs;
108 private:
109 ConstMethod* _constMethod; // Method read-only data.
110 MethodData* _method_data;
111 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
112 AccessFlags _access_flags; // Access flags
113 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
114 // note: can have vtables with >2**16 elements (because of inheritance)
115 #ifdef CC_INTERP
116 int _result_index; // C++ interpreter needs for converting results to/from stack
117 #endif
118 u2 _method_size; // size of this object
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 u1 _jfr_towrite : 1, // Flags
123 _force_inline : 1,
124 _hidden : 1,
125 _dont_inline : 1,
126 : 4;
127 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
128 u2 _number_of_breakpoints; // fullspeed debugging support
129 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
130 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
132 #ifdef TIERED
133 jlong _prev_time; // Previous time the rate was acquired
134 float _rate; // Events (invocation and backedge counter increments) per millisecond
135 #endif
137 #ifndef PRODUCT
138 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
139 #endif
140 // Entry point for calling both from and to the interpreter.
141 address _i2i_entry; // All-args-on-stack calling convention
142 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
143 AdapterHandlerEntry* _adapter;
144 // Entry point for calling from compiled code, to compiled code if it exists
145 // or else the interpreter.
146 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
147 // The entry point for calling both from and to compiled code is
148 // "_code->entry_point()". Because of tiered compilation and de-opt, this
149 // field can come and go. It can transition from NULL to not-null at any
150 // time (whenever a compile completes). It can transition from not-null to
151 // NULL only at safepoints (because of a de-opt).
152 nmethod* volatile _code; // Points to the corresponding piece of native code
153 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
155 // Constructor
156 Method(ConstMethod* xconst, AccessFlags access_flags, int size);
157 public:
159 static Method* allocate(ClassLoaderData* loader_data,
160 int byte_code_size,
161 AccessFlags access_flags,
162 int compressed_line_number_size,
163 int localvariable_table_length,
164 int exception_table_length,
165 int checked_exceptions_length,
166 u2 generic_signature_index,
167 ConstMethod::MethodType method_type,
168 TRAPS);
170 // CDS and vtbl checking can create an empty Method to get vtbl pointer.
171 Method(){}
173 // The Method vtable is restored by this call when the Method is in the
174 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for
175 // all the gory details. SA, dtrace and pstack helpers distinguish metadata
176 // by their vtable.
177 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
178 bool is_method() const volatile { return true; }
180 // accessors for instance variables
182 ConstMethod* constMethod() const { return _constMethod; }
183 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
186 static address make_adapters(methodHandle mh, TRAPS);
187 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
188 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
190 // access flag
191 AccessFlags access_flags() const { return _access_flags; }
192 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
194 // name
195 Symbol* name() const { return constants()->symbol_at(name_index()); }
196 int name_index() const { return constMethod()->name_index(); }
197 void set_name_index(int index) { constMethod()->set_name_index(index); }
199 // signature
200 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
201 int signature_index() const { return constMethod()->signature_index(); }
202 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
204 // generics support
205 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
206 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
207 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
209 // annotations support
210 AnnotationArray* annotations() const {
211 InstanceKlass* ik = method_holder();
212 if (ik->annotations() == NULL) {
213 return NULL;
214 }
215 return ik->annotations()->get_method_annotations_of(method_idnum());
216 }
217 AnnotationArray* parameter_annotations() const {
218 InstanceKlass* ik = method_holder();
219 if (ik->annotations() == NULL) {
220 return NULL;
221 }
222 return ik->annotations()->get_method_parameter_annotations_of(method_idnum());
223 }
224 AnnotationArray* annotation_default() const {
225 InstanceKlass* ik = method_holder();
226 if (ik->annotations() == NULL) {
227 return NULL;
228 }
229 return ik->annotations()->get_method_default_annotations_of(method_idnum());
230 }
231 AnnotationArray* type_annotations() const {
232 InstanceKlass* ik = method_holder();
233 Annotations* type_annos = ik->type_annotations();
234 if (type_annos == NULL)
235 return NULL;
236 return type_annos->get_method_annotations_of(method_idnum());
237 }
239 #ifdef CC_INTERP
240 void set_result_index(BasicType type);
241 int result_index() { return _result_index; }
242 #endif
244 // Helper routine: get klass name + "." + method name + signature as
245 // C string, for the purpose of providing more useful NoSuchMethodErrors
246 // and fatal error handling. The string is allocated in resource
247 // area if a buffer is not provided by the caller.
248 char* name_and_sig_as_C_string() const;
249 char* name_and_sig_as_C_string(char* buf, int size) const;
251 // Static routine in the situations we don't have a Method*
252 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
253 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
255 Bytecodes::Code java_code_at(int bci) const {
256 return Bytecodes::java_code_at(this, bcp_from(bci));
257 }
258 Bytecodes::Code code_at(int bci) const {
259 return Bytecodes::code_at(this, bcp_from(bci));
260 }
262 // JVMTI breakpoints
263 Bytecodes::Code orig_bytecode_at(int bci) const;
264 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
265 void set_breakpoint(int bci);
266 void clear_breakpoint(int bci);
267 void clear_all_breakpoints();
268 // Tracking number of breakpoints, for fullspeed debugging.
269 // Only mutated by VM thread.
270 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
271 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
272 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
273 // Initialization only
274 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
276 // index into InstanceKlass methods() array
277 // note: also used by jfr
278 u2 method_idnum() const { return constMethod()->method_idnum(); }
279 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
281 // code size
282 int code_size() const { return constMethod()->code_size(); }
284 // method size
285 int method_size() const { return _method_size; }
286 void set_method_size(int size) {
287 assert(0 <= size && size < (1 << 16), "invalid method size");
288 _method_size = size;
289 }
291 // constant pool for Klass* holding this method
292 ConstantPool* constants() const { return constMethod()->constants(); }
293 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
295 // max stack
296 // return original max stack size for method verification
297 int verifier_max_stack() const { return constMethod()->max_stack(); }
298 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
299 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
301 // max locals
302 int max_locals() const { return _max_locals; }
303 void set_max_locals(int size) { _max_locals = size; }
305 int highest_comp_level() const;
306 void set_highest_comp_level(int level);
307 int highest_osr_comp_level() const;
308 void set_highest_osr_comp_level(int level);
310 // Count of times method was exited via exception while interpreting
311 void interpreter_throwout_increment() {
312 if (_interpreter_throwout_count < 65534) {
313 _interpreter_throwout_count++;
314 }
315 }
317 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
318 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
320 // size of parameters
321 int size_of_parameters() const { return _size_of_parameters; }
323 bool has_stackmap_table() const {
324 return constMethod()->has_stackmap_table();
325 }
327 Array<u1>* stackmap_data() const {
328 return constMethod()->stackmap_data();
329 }
331 void set_stackmap_data(Array<u1>* sd) {
332 constMethod()->set_stackmap_data(sd);
333 }
335 // exception handler table
336 bool has_exception_handler() const
337 { return constMethod()->has_exception_handler(); }
338 int exception_table_length() const
339 { return constMethod()->exception_table_length(); }
340 ExceptionTableElement* exception_table_start() const
341 { return constMethod()->exception_table_start(); }
343 // Finds the first entry point bci of an exception handler for an
344 // exception of klass ex_klass thrown at throw_bci. A value of NULL
345 // for ex_klass indicates that the exception klass is not known; in
346 // this case it matches any constraint class. Returns -1 if the
347 // exception cannot be handled in this method. The handler
348 // constraint classes are loaded if necessary. Note that this may
349 // throw an exception if loading of the constraint classes causes
350 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
351 // If an exception is thrown, returns the bci of the
352 // exception handler which caused the exception to be thrown, which
353 // is needed for proper retries. See, for example,
354 // InterpreterRuntime::exception_handler_for_exception.
355 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
357 // method data access
358 MethodData* method_data() const {
359 return _method_data;
360 }
361 void set_method_data(MethodData* data) {
362 _method_data = data;
363 }
365 // invocation counter
366 InvocationCounter* invocation_counter() { return &_invocation_counter; }
367 InvocationCounter* backedge_counter() { return &_backedge_counter; }
369 #ifdef TIERED
370 // We are reusing interpreter_invocation_count as a holder for the previous event count!
371 // We can do that since interpreter_invocation_count is not used in tiered.
372 int prev_event_count() const { return _interpreter_invocation_count; }
373 void set_prev_event_count(int count) { _interpreter_invocation_count = count; }
374 jlong prev_time() const { return _prev_time; }
375 void set_prev_time(jlong time) { _prev_time = time; }
376 float rate() const { return _rate; }
377 void set_rate(float rate) { _rate = rate; }
378 #endif
380 int invocation_count();
381 int backedge_count();
383 bool was_executed_more_than(int n);
384 bool was_never_executed() { return !was_executed_more_than(0); }
386 static void build_interpreter_method_data(methodHandle method, TRAPS);
388 int interpreter_invocation_count() {
389 if (TieredCompilation) return invocation_count();
390 else return _interpreter_invocation_count;
391 }
392 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
393 int increment_interpreter_invocation_count() {
394 if (TieredCompilation) ShouldNotReachHere();
395 return ++_interpreter_invocation_count;
396 }
398 #ifndef PRODUCT
399 int compiled_invocation_count() const { return _compiled_invocation_count; }
400 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
401 #endif // not PRODUCT
403 // Clear (non-shared space) pointers which could not be relevant
404 // if this (shared) method were mapped into another JVM.
405 void remove_unshareable_info();
407 // nmethod/verified compiler entry
408 address verified_code_entry();
409 bool check_code() const; // Not inline to avoid circular ref
410 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
411 void clear_code(); // Clear out any compiled code
412 static void set_code(methodHandle mh, nmethod* code);
413 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
414 address get_i2c_entry();
415 address get_c2i_entry();
416 address get_c2i_unverified_entry();
417 AdapterHandlerEntry* adapter() { return _adapter; }
418 // setup entry points
419 void link_method(methodHandle method, TRAPS);
420 // clear entry points. Used by sharing code
421 void unlink_method();
423 // vtable index
424 enum VtableIndexFlag {
425 // Valid vtable indexes are non-negative (>= 0).
426 // These few negative values are used as sentinels.
427 highest_unused_vtable_index_value = -5,
428 invalid_vtable_index = -4, // distinct from any valid vtable index
429 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
430 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
431 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
432 };
433 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
434 int vtable_index() const { assert(valid_vtable_index(), "");
435 return _vtable_index; }
436 void set_vtable_index(int index) { _vtable_index = index; }
438 // interpreter entry
439 address interpreter_entry() const { return _i2i_entry; }
440 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
441 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
442 int interpreter_kind(void) {
443 return constMethod()->interpreter_kind();
444 }
445 void set_interpreter_kind();
446 void set_interpreter_kind(int kind) {
447 constMethod()->set_interpreter_kind(kind);
448 }
450 // native function (used for native methods only)
451 enum {
452 native_bind_event_is_interesting = true
453 };
454 address native_function() const { return *(native_function_addr()); }
455 address critical_native_function();
457 // Must specify a real function (not NULL).
458 // Use clear_native_function() to unregister.
459 void set_native_function(address function, bool post_event_flag);
460 bool has_native_function() const;
461 void clear_native_function();
463 // signature handler (used for native methods only)
464 address signature_handler() const { return *(signature_handler_addr()); }
465 void set_signature_handler(address handler);
467 // Interpreter oopmap support
468 void mask_for(int bci, InterpreterOopMap* mask);
470 #ifndef PRODUCT
471 // operations on invocation counter
472 void print_invocation_count();
473 #endif
475 // byte codes
476 void set_code(address code) { return constMethod()->set_code(code); }
477 address code_base() const { return constMethod()->code_base(); }
478 bool contains(address bcp) const { return constMethod()->contains(bcp); }
480 // prints byte codes
481 void print_codes() const { print_codes_on(tty); }
482 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
483 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
485 // checked exceptions
486 int checked_exceptions_length() const
487 { return constMethod()->checked_exceptions_length(); }
488 CheckedExceptionElement* checked_exceptions_start() const
489 { return constMethod()->checked_exceptions_start(); }
491 // localvariable table
492 bool has_localvariable_table() const
493 { return constMethod()->has_localvariable_table(); }
494 int localvariable_table_length() const
495 { return constMethod()->localvariable_table_length(); }
496 LocalVariableTableElement* localvariable_table_start() const
497 { return constMethod()->localvariable_table_start(); }
499 bool has_linenumber_table() const
500 { return constMethod()->has_linenumber_table(); }
501 u_char* compressed_linenumber_table() const
502 { return constMethod()->compressed_linenumber_table(); }
504 // method holder (the Klass* holding this method)
505 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
507 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
508 Symbol* klass_name() const; // returns the name of the method holder
509 BasicType result_type() const; // type of the method result
510 int result_type_index() const; // type index of the method result
511 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
512 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
514 // Checked exceptions thrown by this method (resolved to mirrors)
515 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
517 // Access flags
518 bool is_public() const { return access_flags().is_public(); }
519 bool is_private() const { return access_flags().is_private(); }
520 bool is_protected() const { return access_flags().is_protected(); }
521 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
522 bool is_static() const { return access_flags().is_static(); }
523 bool is_final() const { return access_flags().is_final(); }
524 bool is_synchronized() const { return access_flags().is_synchronized();}
525 bool is_native() const { return access_flags().is_native(); }
526 bool is_abstract() const { return access_flags().is_abstract(); }
527 bool is_strict() const { return access_flags().is_strict(); }
528 bool is_synthetic() const { return access_flags().is_synthetic(); }
530 // returns true if contains only return operation
531 bool is_empty_method() const;
533 // returns true if this is a vanilla constructor
534 bool is_vanilla_constructor() const;
536 // checks method and its method holder
537 bool is_final_method() const;
538 bool is_strict_method() const;
540 // true if method needs no dynamic dispatch (final and/or no vtable entry)
541 bool can_be_statically_bound() const;
543 // returns true if the method has any backward branches.
544 bool has_loops() {
545 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
546 };
548 bool compute_has_loops_flag();
550 bool has_jsrs() {
551 return access_flags().has_jsrs();
552 };
553 void set_has_jsrs() {
554 _access_flags.set_has_jsrs();
555 }
557 // returns true if the method has any monitors.
558 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
559 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
561 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
563 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
564 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
565 // has not been computed yet.
566 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
567 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
569 // returns true if the method is an accessor function (setter/getter).
570 bool is_accessor() const;
572 // returns true if the method is an initializer (<init> or <clinit>).
573 bool is_initializer() const;
575 // returns true if the method is static OR if the classfile version < 51
576 bool has_valid_initializer_flags() const;
578 // returns true if the method name is <clinit> and the method has
579 // valid static initializer flags.
580 bool is_static_initializer() const;
582 // compiled code support
583 // NOTE: code() is inherently racy as deopt can be clearing code
584 // simultaneously. Use with caution.
585 bool has_compiled_code() const { return code() != NULL; }
587 // sizing
588 static int header_size() { return sizeof(Method)/HeapWordSize; }
589 static int size(bool is_native);
590 int size() const { return method_size(); }
592 // interpreter support
593 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
594 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
595 #ifdef CC_INTERP
596 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); }
597 #endif /* CC_INTERP */
598 static ByteSize size_of_locals_offset() { return byte_offset_of(Method, _max_locals ); }
599 static ByteSize size_of_parameters_offset() { return byte_offset_of(Method, _size_of_parameters); }
600 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
601 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
602 static ByteSize invocation_counter_offset() { return byte_offset_of(Method, _invocation_counter); }
603 static ByteSize backedge_counter_offset() { return byte_offset_of(Method, _backedge_counter); }
604 static ByteSize method_data_offset() {
605 return byte_offset_of(Method, _method_data);
606 }
607 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(Method, _interpreter_invocation_count); }
608 #ifndef PRODUCT
609 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
610 #endif // not PRODUCT
611 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
612 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
613 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
614 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
616 // for code generation
617 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
618 static int interpreter_invocation_counter_offset_in_bytes()
619 { return offset_of(Method, _interpreter_invocation_count); }
620 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
621 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
623 // Static methods that are used to implement member methods where an exposed this pointer
624 // is needed due to possible GCs
625 static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS);
627 // Returns the byte code index from the byte code pointer
628 int bci_from(address bcp) const;
629 address bcp_from(int bci) const;
630 int validate_bci_from_bcx(intptr_t bcx) const;
632 // Returns the line number for a bci if debugging information for the method is prowided,
633 // -1 is returned otherwise.
634 int line_number_from_bci(int bci) const;
636 // Reflection support
637 bool is_overridden_in(Klass* k) const;
639 // JSR 292 support
640 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
641 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
642 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
643 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
644 Symbol* signature, //anything at all
645 TRAPS);
646 static Klass* check_non_bcp_klass(Klass* klass);
647 // these operate only on invoke methods:
648 // presize interpreter frames for extra interpreter stack entries, if needed
649 // method handles want to be able to push a few extra values (e.g., a bound receiver), and
650 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
651 // all without checking for a stack overflow
652 static int extra_stack_entries() { return EnableInvokeDynamic ? 2 : 0; }
653 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize()
655 // RedefineClasses() support:
656 bool is_old() const { return access_flags().is_old(); }
657 void set_is_old() { _access_flags.set_is_old(); }
658 bool is_obsolete() const { return access_flags().is_obsolete(); }
659 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
660 bool on_stack() const { return access_flags().on_stack(); }
661 void set_on_stack(const bool value);
663 // see the definition in Method*.cpp for the gory details
664 bool should_not_be_cached() const;
666 // JVMTI Native method prefixing support:
667 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
668 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
670 // Rewriting support
671 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
672 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
674 // jmethodID handling
675 // Because the useful life-span of a jmethodID cannot be determined,
676 // once created they are never reclaimed. The methods to which they refer,
677 // however, can be GC'ed away if the class is unloaded or if the method is
678 // made obsolete or deleted -- in these cases, the jmethodID
679 // refers to NULL (as is the case for any weak reference).
680 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
681 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
683 // Use resolve_jmethod_id() in situations where the caller is expected
684 // to provide a valid jmethodID; the only sanity checks are in asserts;
685 // result guaranteed not to be NULL.
686 inline static Method* resolve_jmethod_id(jmethodID mid) {
687 assert(mid != NULL, "JNI method id should not be null");
688 return *((Method**)mid);
689 }
691 // Use checked_resolve_jmethod_id() in situations where the caller
692 // should provide a valid jmethodID, but might not. NULL is returned
693 // when the jmethodID does not refer to a valid method.
694 static Method* checked_resolve_jmethod_id(jmethodID mid);
696 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
697 static bool is_method_id(jmethodID mid);
699 // Clear methods
700 static void clear_jmethod_ids(ClassLoaderData* loader_data);
701 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
703 // Get this method's jmethodID -- allocate if it doesn't exist
704 jmethodID jmethod_id() { methodHandle this_h(this);
705 return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
707 // Lookup the jmethodID for this method. Return NULL if not found.
708 // NOTE that this function can be called from a signal handler
709 // (see AsyncGetCallTrace support for Forte Analyzer) and this
710 // needs to be async-safe. No allocation should be done and
711 // so handles are not used to avoid deadlock.
712 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
714 // JNI static invoke cached itable index accessors
715 int cached_itable_index() { return method_holder()->cached_itable_index(method_idnum()); }
716 void set_cached_itable_index(int index) { method_holder()->set_cached_itable_index(method_idnum(), index); }
718 // Support for inlining of intrinsic methods
719 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
720 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
722 // Helper routines for intrinsic_id() and vmIntrinsics::method().
723 void init_intrinsic_id(); // updates from _none if a match
724 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder);
726 bool jfr_towrite() { return _jfr_towrite; }
727 void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; }
729 bool force_inline() { return _force_inline; }
730 void set_force_inline(bool x) { _force_inline = x; }
731 bool dont_inline() { return _dont_inline; }
732 void set_dont_inline(bool x) { _dont_inline = x; }
733 bool is_hidden() { return _hidden; }
734 void set_hidden(bool x) { _hidden = x; }
735 ConstMethod::MethodType method_type() const {
736 return _constMethod->method_type();
737 }
738 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
740 // On-stack replacement support
741 bool has_osr_nmethod(int level, bool match_level) {
742 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
743 }
745 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
746 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
747 }
749 // Inline cache support
750 void cleanup_inline_caches();
752 // Find if klass for method is loaded
753 bool is_klass_loaded_by_klass_index(int klass_index) const;
754 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
756 // Indicates whether compilation failed earlier for this method, or
757 // whether it is not compilable for another reason like having a
758 // breakpoint set in it.
759 bool is_not_compilable(int comp_level = CompLevel_any) const;
760 void set_not_compilable(int comp_level = CompLevel_all, bool report = true);
761 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
762 set_not_compilable(comp_level, false);
763 }
764 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
765 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true);
766 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
767 set_not_osr_compilable(comp_level, false);
768 }
770 private:
771 void print_made_not_compilable(int comp_level, bool is_osr, bool report);
773 public:
774 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
775 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
776 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
777 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
779 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit
780 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit
781 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); }
782 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); }
784 // Background compilation support
785 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
786 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
787 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
789 // Resolve all classes in signature, return 'true' if successful
790 static bool load_signature_classes(methodHandle m, TRAPS);
792 // Return if true if not all classes references in signature, including return type, has been loaded
793 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
795 // Printing
796 void print_short_name(outputStream* st = tty) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
797 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)"
799 // Helper routine used for method sorting
800 static void sort_methods(Array<Method*>* methods,
801 Array<AnnotationArray*>* methods_annotations,
802 Array<AnnotationArray*>* methods_parameter_annotations,
803 Array<AnnotationArray*>* methods_default_annotations,
804 Array<AnnotationArray*>* methods_type_annotations,
805 bool idempotent = false);
807 // size of parameters
808 void set_size_of_parameters(int size) { _size_of_parameters = size; }
810 // Deallocation function for redefine classes or if an error occurs
811 void deallocate_contents(ClassLoaderData* loader_data);
813 // Printing
814 #ifndef PRODUCT
815 void print_on(outputStream* st) const;
816 #endif
817 void print_value_on(outputStream* st) const;
819 const char* internal_name() const { return "{method}"; }
821 // Check for valid method pointer
822 bool is_valid_method() const;
824 // Verify
825 void verify() { verify_on(tty); }
826 void verify_on(outputStream* st);
828 private:
830 // Inlined elements
831 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
832 address* signature_handler_addr() const { return native_function_addr() + 1; }
833 };
836 // Utility class for compressing line number tables
838 class CompressedLineNumberWriteStream: public CompressedWriteStream {
839 private:
840 int _bci;
841 int _line;
842 public:
843 // Constructor
844 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
845 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
847 // Write (bci, line number) pair to stream
848 void write_pair_regular(int bci_delta, int line_delta);
850 inline void write_pair_inline(int bci, int line) {
851 int bci_delta = bci - _bci;
852 int line_delta = line - _line;
853 _bci = bci;
854 _line = line;
855 // Skip (0,0) deltas - they do not add information and conflict with terminator.
856 if (bci_delta == 0 && line_delta == 0) return;
857 // Check if bci is 5-bit and line number 3-bit unsigned.
858 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
859 // Compress into single byte.
860 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
861 // Check that value doesn't match escape character.
862 if (value != 0xFF) {
863 write_byte(value);
864 return;
865 }
866 }
867 write_pair_regular(bci_delta, line_delta);
868 }
870 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
871 // Disabling optimization doesn't work for methods in header files
872 // so we force it to call through the non-optimized version in the .cpp.
873 // It's gross, but it's the only way we can ensure that all callers are
874 // fixed. _MSC_VER is defined by the windows compiler
875 #if defined(_M_AMD64) && _MSC_VER >= 1400
876 void write_pair(int bci, int line);
877 #else
878 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
879 #endif
881 // Write end-of-stream marker
882 void write_terminator() { write_byte(0); }
883 };
886 // Utility class for decompressing line number tables
888 class CompressedLineNumberReadStream: public CompressedReadStream {
889 private:
890 int _bci;
891 int _line;
892 public:
893 // Constructor
894 CompressedLineNumberReadStream(u_char* buffer);
895 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
896 bool read_pair();
897 // Accessing bci and line number (after calling read_pair)
898 int bci() const { return _bci; }
899 int line() const { return _line; }
900 };
903 /// Fast Breakpoints.
905 // If this structure gets more complicated (because bpts get numerous),
906 // move it into its own header.
908 // There is presently no provision for concurrent access
909 // to breakpoint lists, which is only OK for JVMTI because
910 // breakpoints are written only at safepoints, and are read
911 // concurrently only outside of safepoints.
913 class BreakpointInfo : public CHeapObj<mtClass> {
914 friend class VMStructs;
915 private:
916 Bytecodes::Code _orig_bytecode;
917 int _bci;
918 u2 _name_index; // of method
919 u2 _signature_index; // of method
920 BreakpointInfo* _next; // simple storage allocation
922 public:
923 BreakpointInfo(Method* m, int bci);
925 // accessors
926 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
927 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
928 int bci() { return _bci; }
930 BreakpointInfo* next() const { return _next; }
931 void set_next(BreakpointInfo* n) { _next = n; }
933 // helps for searchers
934 bool match(const Method* m, int bci) {
935 return bci == _bci && match(m);
936 }
938 bool match(const Method* m) {
939 return _name_index == m->name_index() &&
940 _signature_index == m->signature_index();
941 }
943 void set(Method* method);
944 void clear(Method* method);
945 };
947 // Utility class for access exception handlers
948 class ExceptionTable : public StackObj {
949 private:
950 ExceptionTableElement* _table;
951 u2 _length;
953 public:
954 ExceptionTable(Method* m) {
955 if (m->has_exception_handler()) {
956 _table = m->exception_table_start();
957 _length = m->exception_table_length();
958 } else {
959 _table = NULL;
960 _length = 0;
961 }
962 }
964 int length() const {
965 return _length;
966 }
968 u2 start_pc(int idx) const {
969 assert(idx < _length, "out of bounds");
970 return _table[idx].start_pc;
971 }
973 void set_start_pc(int idx, u2 value) {
974 assert(idx < _length, "out of bounds");
975 _table[idx].start_pc = value;
976 }
978 u2 end_pc(int idx) const {
979 assert(idx < _length, "out of bounds");
980 return _table[idx].end_pc;
981 }
983 void set_end_pc(int idx, u2 value) {
984 assert(idx < _length, "out of bounds");
985 _table[idx].end_pc = value;
986 }
988 u2 handler_pc(int idx) const {
989 assert(idx < _length, "out of bounds");
990 return _table[idx].handler_pc;
991 }
993 void set_handler_pc(int idx, u2 value) {
994 assert(idx < _length, "out of bounds");
995 _table[idx].handler_pc = value;
996 }
998 u2 catch_type_index(int idx) const {
999 assert(idx < _length, "out of bounds");
1000 return _table[idx].catch_type_index;
1001 }
1003 void set_catch_type_index(int idx, u2 value) {
1004 assert(idx < _length, "out of bounds");
1005 _table[idx].catch_type_index = value;
1006 }
1007 };
1009 #endif // SHARE_VM_OOPS_METHODOOP_HPP