Wed, 28 Nov 2012 17:50:21 -0500
8003635: NPG: AsynchGetCallTrace broken by Method* virtual call
Summary: Make metaspace::contains be lock free and used to see if something is in metaspace, also compare Method* with vtbl pointer.
Reviewed-by: dholmes, sspitsyn, dcubed, jmasa
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.
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.
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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 *
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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.
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23 */
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_stack |
77 // | max_locals | size_of_parameters |
78 // |------------------------------------------------------|
79 // |intrinsic_id| flags | throwout_count |
80 // |------------------------------------------------------|
81 // | num_breakpoints | (unused) |
82 // |------------------------------------------------------|
83 // | invocation_counter |
84 // | backedge_counter |
85 // |------------------------------------------------------|
86 // | prev_time (tiered only, 64 bit wide) |
87 // | |
88 // |------------------------------------------------------|
89 // | rate (tiered) |
90 // |------------------------------------------------------|
91 // | code (pointer) |
92 // | i2i (pointer) |
93 // | adapter (pointer) |
94 // | from_compiled_entry (pointer) |
95 // | from_interpreted_entry (pointer) |
96 // |------------------------------------------------------|
97 // | native_function (present only if native) |
98 // | signature_handler (present only if native) |
99 // |------------------------------------------------------|
102 class CheckedExceptionElement;
103 class LocalVariableTableElement;
104 class AdapterHandlerEntry;
105 class MethodData;
106 class ConstMethod;
108 class Method : public Metadata {
109 friend class VMStructs;
110 private:
111 ConstMethod* _constMethod; // Method read-only data.
112 MethodData* _method_data;
113 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
114 AccessFlags _access_flags; // Access flags
115 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
116 // note: can have vtables with >2**16 elements (because of inheritance)
117 #ifdef CC_INTERP
118 int _result_index; // C++ interpreter needs for converting results to/from stack
119 #endif
120 u2 _method_size; // size of this object
121 u2 _max_stack; // Maximum number of entries on the expression stack
122 u2 _max_locals; // Number of local variables used by this method
123 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
124 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
125 u1 _jfr_towrite : 1, // Flags
126 _force_inline : 1,
127 _hidden : 1,
128 _dont_inline : 1,
129 : 4;
130 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
131 u2 _number_of_breakpoints; // fullspeed debugging support
132 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
133 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
135 #ifdef TIERED
136 jlong _prev_time; // Previous time the rate was acquired
137 float _rate; // Events (invocation and backedge counter increments) per millisecond
138 #endif
140 #ifndef PRODUCT
141 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
142 #endif
143 // Entry point for calling both from and to the interpreter.
144 address _i2i_entry; // All-args-on-stack calling convention
145 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
146 AdapterHandlerEntry* _adapter;
147 // Entry point for calling from compiled code, to compiled code if it exists
148 // or else the interpreter.
149 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
150 // The entry point for calling both from and to compiled code is
151 // "_code->entry_point()". Because of tiered compilation and de-opt, this
152 // field can come and go. It can transition from NULL to not-null at any
153 // time (whenever a compile completes). It can transition from not-null to
154 // NULL only at safepoints (because of a de-opt).
155 nmethod* volatile _code; // Points to the corresponding piece of native code
156 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
158 // Constructor
159 Method(ConstMethod* xconst, AccessFlags access_flags, int size);
160 public:
162 static Method* allocate(ClassLoaderData* loader_data,
163 int byte_code_size,
164 AccessFlags access_flags,
165 int compressed_line_number_size,
166 int localvariable_table_length,
167 int exception_table_length,
168 int checked_exceptions_length,
169 ConstMethod::MethodType method_type,
170 TRAPS);
172 // CDS and vtbl checking can create an empty Method to get vtbl pointer.
173 Method(){}
175 // The Method vtable is restored by this call when the Method is in the
176 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for
177 // all the gory details. SA, dtrace and pstack helpers distinguish metadata
178 // by their vtable.
179 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
180 bool is_method() const volatile { return true; }
182 // accessors for instance variables
184 ConstMethod* constMethod() const { return _constMethod; }
185 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
188 static address make_adapters(methodHandle mh, TRAPS);
189 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
190 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
192 // access flag
193 AccessFlags access_flags() const { return _access_flags; }
194 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
196 // name
197 Symbol* name() const { return constants()->symbol_at(name_index()); }
198 int name_index() const { return constMethod()->name_index(); }
199 void set_name_index(int index) { constMethod()->set_name_index(index); }
201 // signature
202 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
203 int signature_index() const { return constMethod()->signature_index(); }
204 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
206 // generics support
207 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
208 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
209 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
211 // annotations support
212 AnnotationArray* annotations() const {
213 InstanceKlass* ik = method_holder();
214 if (ik->annotations() == NULL) {
215 return NULL;
216 }
217 return ik->annotations()->get_method_annotations_of(method_idnum());
218 }
219 AnnotationArray* parameter_annotations() const {
220 InstanceKlass* ik = method_holder();
221 if (ik->annotations() == NULL) {
222 return NULL;
223 }
224 return ik->annotations()->get_method_parameter_annotations_of(method_idnum());
225 }
226 AnnotationArray* annotation_default() const {
227 InstanceKlass* ik = method_holder();
228 if (ik->annotations() == NULL) {
229 return NULL;
230 }
231 return ik->annotations()->get_method_default_annotations_of(method_idnum());
232 }
234 #ifdef CC_INTERP
235 void set_result_index(BasicType type);
236 int result_index() { return _result_index; }
237 #endif
239 // Helper routine: get klass name + "." + method name + signature as
240 // C string, for the purpose of providing more useful NoSuchMethodErrors
241 // and fatal error handling. The string is allocated in resource
242 // area if a buffer is not provided by the caller.
243 char* name_and_sig_as_C_string() const;
244 char* name_and_sig_as_C_string(char* buf, int size) const;
246 // Static routine in the situations we don't have a Method*
247 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
248 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
250 Bytecodes::Code java_code_at(int bci) const {
251 return Bytecodes::java_code_at(this, bcp_from(bci));
252 }
253 Bytecodes::Code code_at(int bci) const {
254 return Bytecodes::code_at(this, bcp_from(bci));
255 }
257 // JVMTI breakpoints
258 Bytecodes::Code orig_bytecode_at(int bci) const;
259 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
260 void set_breakpoint(int bci);
261 void clear_breakpoint(int bci);
262 void clear_all_breakpoints();
263 // Tracking number of breakpoints, for fullspeed debugging.
264 // Only mutated by VM thread.
265 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
266 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
267 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
268 // Initialization only
269 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
271 // index into InstanceKlass methods() array
272 // note: also used by jfr
273 u2 method_idnum() const { return constMethod()->method_idnum(); }
274 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
276 // code size
277 int code_size() const { return constMethod()->code_size(); }
279 // method size
280 int method_size() const { return _method_size; }
281 void set_method_size(int size) {
282 assert(0 <= size && size < (1 << 16), "invalid method size");
283 _method_size = size;
284 }
286 // constant pool for Klass* holding this method
287 ConstantPool* constants() const { return constMethod()->constants(); }
288 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
290 // max stack
291 // return original max stack size for method verification
292 int verifier_max_stack() const { return _max_stack; }
293 int max_stack() const { return _max_stack + extra_stack_entries(); }
294 void set_max_stack(int size) { _max_stack = size; }
296 // max locals
297 int max_locals() const { return _max_locals; }
298 void set_max_locals(int size) { _max_locals = size; }
300 int highest_comp_level() const;
301 void set_highest_comp_level(int level);
302 int highest_osr_comp_level() const;
303 void set_highest_osr_comp_level(int level);
305 // Count of times method was exited via exception while interpreting
306 void interpreter_throwout_increment() {
307 if (_interpreter_throwout_count < 65534) {
308 _interpreter_throwout_count++;
309 }
310 }
312 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
313 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
315 // size of parameters
316 int size_of_parameters() const { return _size_of_parameters; }
318 bool has_stackmap_table() const {
319 return constMethod()->has_stackmap_table();
320 }
322 Array<u1>* stackmap_data() const {
323 return constMethod()->stackmap_data();
324 }
326 void set_stackmap_data(Array<u1>* sd) {
327 constMethod()->set_stackmap_data(sd);
328 }
330 // exception handler table
331 bool has_exception_handler() const
332 { return constMethod()->has_exception_handler(); }
333 int exception_table_length() const
334 { return constMethod()->exception_table_length(); }
335 ExceptionTableElement* exception_table_start() const
336 { return constMethod()->exception_table_start(); }
338 // Finds the first entry point bci of an exception handler for an
339 // exception of klass ex_klass thrown at throw_bci. A value of NULL
340 // for ex_klass indicates that the exception klass is not known; in
341 // this case it matches any constraint class. Returns -1 if the
342 // exception cannot be handled in this method. The handler
343 // constraint classes are loaded if necessary. Note that this may
344 // throw an exception if loading of the constraint classes causes
345 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
346 // If an exception is thrown, returns the bci of the
347 // exception handler which caused the exception to be thrown, which
348 // is needed for proper retries. See, for example,
349 // InterpreterRuntime::exception_handler_for_exception.
350 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
352 // method data access
353 MethodData* method_data() const {
354 return _method_data;
355 }
356 void set_method_data(MethodData* data) {
357 _method_data = data;
358 }
360 // invocation counter
361 InvocationCounter* invocation_counter() { return &_invocation_counter; }
362 InvocationCounter* backedge_counter() { return &_backedge_counter; }
364 #ifdef TIERED
365 // We are reusing interpreter_invocation_count as a holder for the previous event count!
366 // We can do that since interpreter_invocation_count is not used in tiered.
367 int prev_event_count() const { return _interpreter_invocation_count; }
368 void set_prev_event_count(int count) { _interpreter_invocation_count = count; }
369 jlong prev_time() const { return _prev_time; }
370 void set_prev_time(jlong time) { _prev_time = time; }
371 float rate() const { return _rate; }
372 void set_rate(float rate) { _rate = rate; }
373 #endif
375 int invocation_count();
376 int backedge_count();
378 bool was_executed_more_than(int n);
379 bool was_never_executed() { return !was_executed_more_than(0); }
381 static void build_interpreter_method_data(methodHandle method, TRAPS);
383 int interpreter_invocation_count() {
384 if (TieredCompilation) return invocation_count();
385 else return _interpreter_invocation_count;
386 }
387 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
388 int increment_interpreter_invocation_count() {
389 if (TieredCompilation) ShouldNotReachHere();
390 return ++_interpreter_invocation_count;
391 }
393 #ifndef PRODUCT
394 int compiled_invocation_count() const { return _compiled_invocation_count; }
395 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
396 #endif // not PRODUCT
398 // Clear (non-shared space) pointers which could not be relevant
399 // if this (shared) method were mapped into another JVM.
400 void remove_unshareable_info();
402 // nmethod/verified compiler entry
403 address verified_code_entry();
404 bool check_code() const; // Not inline to avoid circular ref
405 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
406 void clear_code(); // Clear out any compiled code
407 static void set_code(methodHandle mh, nmethod* code);
408 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
409 address get_i2c_entry();
410 address get_c2i_entry();
411 address get_c2i_unverified_entry();
412 AdapterHandlerEntry* adapter() { return _adapter; }
413 // setup entry points
414 void link_method(methodHandle method, TRAPS);
415 // clear entry points. Used by sharing code
416 void unlink_method();
418 // vtable index
419 enum VtableIndexFlag {
420 // Valid vtable indexes are non-negative (>= 0).
421 // These few negative values are used as sentinels.
422 highest_unused_vtable_index_value = -5,
423 invalid_vtable_index = -4, // distinct from any valid vtable index
424 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
425 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
426 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
427 };
428 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
429 int vtable_index() const { assert(valid_vtable_index(), "");
430 return _vtable_index; }
431 void set_vtable_index(int index) { _vtable_index = index; }
433 // interpreter entry
434 address interpreter_entry() const { return _i2i_entry; }
435 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
436 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
437 int interpreter_kind(void) {
438 return constMethod()->interpreter_kind();
439 }
440 void set_interpreter_kind();
441 void set_interpreter_kind(int kind) {
442 constMethod()->set_interpreter_kind(kind);
443 }
445 // native function (used for native methods only)
446 enum {
447 native_bind_event_is_interesting = true
448 };
449 address native_function() const { return *(native_function_addr()); }
450 address critical_native_function();
452 // Must specify a real function (not NULL).
453 // Use clear_native_function() to unregister.
454 void set_native_function(address function, bool post_event_flag);
455 bool has_native_function() const;
456 void clear_native_function();
458 // signature handler (used for native methods only)
459 address signature_handler() const { return *(signature_handler_addr()); }
460 void set_signature_handler(address handler);
462 // Interpreter oopmap support
463 void mask_for(int bci, InterpreterOopMap* mask);
465 #ifndef PRODUCT
466 // operations on invocation counter
467 void print_invocation_count();
468 #endif
470 // byte codes
471 void set_code(address code) { return constMethod()->set_code(code); }
472 address code_base() const { return constMethod()->code_base(); }
473 bool contains(address bcp) const { return constMethod()->contains(bcp); }
475 // prints byte codes
476 void print_codes() const { print_codes_on(tty); }
477 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
478 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
480 // checked exceptions
481 int checked_exceptions_length() const
482 { return constMethod()->checked_exceptions_length(); }
483 CheckedExceptionElement* checked_exceptions_start() const
484 { return constMethod()->checked_exceptions_start(); }
486 // localvariable table
487 bool has_localvariable_table() const
488 { return constMethod()->has_localvariable_table(); }
489 int localvariable_table_length() const
490 { return constMethod()->localvariable_table_length(); }
491 LocalVariableTableElement* localvariable_table_start() const
492 { return constMethod()->localvariable_table_start(); }
494 bool has_linenumber_table() const
495 { return constMethod()->has_linenumber_table(); }
496 u_char* compressed_linenumber_table() const
497 { return constMethod()->compressed_linenumber_table(); }
499 // method holder (the Klass* holding this method)
500 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
502 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
503 Symbol* klass_name() const; // returns the name of the method holder
504 BasicType result_type() const; // type of the method result
505 int result_type_index() const; // type index of the method result
506 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
507 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
509 // Checked exceptions thrown by this method (resolved to mirrors)
510 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
512 // Access flags
513 bool is_public() const { return access_flags().is_public(); }
514 bool is_private() const { return access_flags().is_private(); }
515 bool is_protected() const { return access_flags().is_protected(); }
516 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
517 bool is_static() const { return access_flags().is_static(); }
518 bool is_final() const { return access_flags().is_final(); }
519 bool is_synchronized() const { return access_flags().is_synchronized();}
520 bool is_native() const { return access_flags().is_native(); }
521 bool is_abstract() const { return access_flags().is_abstract(); }
522 bool is_strict() const { return access_flags().is_strict(); }
523 bool is_synthetic() const { return access_flags().is_synthetic(); }
525 // returns true if contains only return operation
526 bool is_empty_method() const;
528 // returns true if this is a vanilla constructor
529 bool is_vanilla_constructor() const;
531 // checks method and its method holder
532 bool is_final_method() const;
533 bool is_strict_method() const;
535 // true if method needs no dynamic dispatch (final and/or no vtable entry)
536 bool can_be_statically_bound() const;
538 // returns true if the method has any backward branches.
539 bool has_loops() {
540 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
541 };
543 bool compute_has_loops_flag();
545 bool has_jsrs() {
546 return access_flags().has_jsrs();
547 };
548 void set_has_jsrs() {
549 _access_flags.set_has_jsrs();
550 }
552 // returns true if the method has any monitors.
553 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
554 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
556 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
558 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
559 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
560 // has not been computed yet.
561 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
562 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
564 // returns true if the method is an accessor function (setter/getter).
565 bool is_accessor() const;
567 // returns true if the method is an initializer (<init> or <clinit>).
568 bool is_initializer() const;
570 // returns true if the method is static OR if the classfile version < 51
571 bool has_valid_initializer_flags() const;
573 // returns true if the method name is <clinit> and the method has
574 // valid static initializer flags.
575 bool is_static_initializer() const;
577 // compiled code support
578 // NOTE: code() is inherently racy as deopt can be clearing code
579 // simultaneously. Use with caution.
580 bool has_compiled_code() const { return code() != NULL; }
582 // sizing
583 static int header_size() { return sizeof(Method)/HeapWordSize; }
584 static int size(bool is_native);
585 int size() const { return method_size(); }
587 // interpreter support
588 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
589 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
590 #ifdef CC_INTERP
591 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); }
592 #endif /* CC_INTERP */
593 static ByteSize size_of_locals_offset() { return byte_offset_of(Method, _max_locals ); }
594 static ByteSize size_of_parameters_offset() { return byte_offset_of(Method, _size_of_parameters); }
595 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
596 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
597 static ByteSize invocation_counter_offset() { return byte_offset_of(Method, _invocation_counter); }
598 static ByteSize backedge_counter_offset() { return byte_offset_of(Method, _backedge_counter); }
599 static ByteSize method_data_offset() {
600 return byte_offset_of(Method, _method_data);
601 }
602 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(Method, _interpreter_invocation_count); }
603 #ifndef PRODUCT
604 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
605 #endif // not PRODUCT
606 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
607 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
608 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
609 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
610 static ByteSize max_stack_offset() { return byte_offset_of(Method, _max_stack ); }
612 // for code generation
613 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
614 static int interpreter_invocation_counter_offset_in_bytes()
615 { return offset_of(Method, _interpreter_invocation_count); }
616 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
617 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
619 // Static methods that are used to implement member methods where an exposed this pointer
620 // is needed due to possible GCs
621 static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS);
623 // Returns the byte code index from the byte code pointer
624 int bci_from(address bcp) const;
625 address bcp_from(int bci) const;
626 int validate_bci_from_bcx(intptr_t bcx) const;
628 // Returns the line number for a bci if debugging information for the method is prowided,
629 // -1 is returned otherwise.
630 int line_number_from_bci(int bci) const;
632 // Reflection support
633 bool is_overridden_in(Klass* k) const;
635 // JSR 292 support
636 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
637 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
638 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
639 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
640 Symbol* signature, //anything at all
641 TRAPS);
642 static Klass* check_non_bcp_klass(Klass* klass);
643 // these operate only on invoke methods:
644 // presize interpreter frames for extra interpreter stack entries, if needed
645 // method handles want to be able to push a few extra values (e.g., a bound receiver), and
646 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
647 // all without checking for a stack overflow
648 static int extra_stack_entries() { return EnableInvokeDynamic ? 2 : 0; }
649 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize()
651 // RedefineClasses() support:
652 bool is_old() const { return access_flags().is_old(); }
653 void set_is_old() { _access_flags.set_is_old(); }
654 bool is_obsolete() const { return access_flags().is_obsolete(); }
655 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
656 bool on_stack() const { return access_flags().on_stack(); }
657 void set_on_stack(const bool value);
659 // see the definition in Method*.cpp for the gory details
660 bool should_not_be_cached() const;
662 // JVMTI Native method prefixing support:
663 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
664 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
666 // Rewriting support
667 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
668 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
670 // jmethodID handling
671 // Because the useful life-span of a jmethodID cannot be determined,
672 // once created they are never reclaimed. The methods to which they refer,
673 // however, can be GC'ed away if the class is unloaded or if the method is
674 // made obsolete or deleted -- in these cases, the jmethodID
675 // refers to NULL (as is the case for any weak reference).
676 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
677 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
679 // Use resolve_jmethod_id() in situations where the caller is expected
680 // to provide a valid jmethodID; the only sanity checks are in asserts;
681 // result guaranteed not to be NULL.
682 inline static Method* resolve_jmethod_id(jmethodID mid) {
683 assert(mid != NULL, "JNI method id should not be null");
684 return *((Method**)mid);
685 }
687 // Use checked_resolve_jmethod_id() in situations where the caller
688 // should provide a valid jmethodID, but might not. NULL is returned
689 // when the jmethodID does not refer to a valid method.
690 static Method* checked_resolve_jmethod_id(jmethodID mid);
692 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
693 static bool is_method_id(jmethodID mid);
695 // Clear methods
696 static void clear_jmethod_ids(ClassLoaderData* loader_data);
697 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
699 // Get this method's jmethodID -- allocate if it doesn't exist
700 jmethodID jmethod_id() { methodHandle this_h(this);
701 return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
703 // Lookup the jmethodID for this method. Return NULL if not found.
704 // NOTE that this function can be called from a signal handler
705 // (see AsyncGetCallTrace support for Forte Analyzer) and this
706 // needs to be async-safe. No allocation should be done and
707 // so handles are not used to avoid deadlock.
708 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
710 // JNI static invoke cached itable index accessors
711 int cached_itable_index() { return method_holder()->cached_itable_index(method_idnum()); }
712 void set_cached_itable_index(int index) { method_holder()->set_cached_itable_index(method_idnum(), index); }
714 // Support for inlining of intrinsic methods
715 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
716 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
718 // Helper routines for intrinsic_id() and vmIntrinsics::method().
719 void init_intrinsic_id(); // updates from _none if a match
720 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder);
722 bool jfr_towrite() { return _jfr_towrite; }
723 void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; }
725 bool force_inline() { return _force_inline; }
726 void set_force_inline(bool x) { _force_inline = x; }
727 bool dont_inline() { return _dont_inline; }
728 void set_dont_inline(bool x) { _dont_inline = x; }
729 bool is_hidden() { return _hidden; }
730 void set_hidden(bool x) { _hidden = x; }
731 ConstMethod::MethodType method_type() const {
732 return _constMethod->method_type();
733 }
734 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
736 // On-stack replacement support
737 bool has_osr_nmethod(int level, bool match_level) {
738 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
739 }
741 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
742 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
743 }
745 // Inline cache support
746 void cleanup_inline_caches();
748 // Find if klass for method is loaded
749 bool is_klass_loaded_by_klass_index(int klass_index) const;
750 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
752 // Indicates whether compilation failed earlier for this method, or
753 // whether it is not compilable for another reason like having a
754 // breakpoint set in it.
755 bool is_not_compilable(int comp_level = CompLevel_any) const;
756 void set_not_compilable(int comp_level = CompLevel_all, bool report = true);
757 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
758 set_not_compilable(comp_level, false);
759 }
760 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
761 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true);
762 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
763 set_not_osr_compilable(comp_level, false);
764 }
766 private:
767 void print_made_not_compilable(int comp_level, bool is_osr, bool report);
769 public:
770 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
771 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
772 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
773 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
775 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit
776 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit
777 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); }
778 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); }
780 // Background compilation support
781 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
782 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
783 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
785 // Resolve all classes in signature, return 'true' if successful
786 static bool load_signature_classes(methodHandle m, TRAPS);
788 // Return if true if not all classes references in signature, including return type, has been loaded
789 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
791 // Printing
792 void print_short_name(outputStream* st = tty) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
793 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)"
795 // Helper routine used for method sorting
796 static void sort_methods(Array<Method*>* methods,
797 Array<AnnotationArray*>* methods_annotations,
798 Array<AnnotationArray*>* methods_parameter_annotations,
799 Array<AnnotationArray*>* methods_default_annotations,
800 bool idempotent = false);
802 // size of parameters
803 void set_size_of_parameters(int size) { _size_of_parameters = size; }
805 // Deallocation function for redefine classes or if an error occurs
806 void deallocate_contents(ClassLoaderData* loader_data);
808 // Printing
809 #ifndef PRODUCT
810 void print_on(outputStream* st) const;
811 #endif
812 void print_value_on(outputStream* st) const;
814 const char* internal_name() const { return "{method}"; }
816 // Check for valid method pointer
817 bool is_valid_method() const;
819 // Verify
820 void verify() { verify_on(tty); }
821 void verify_on(outputStream* st);
823 private:
825 // Inlined elements
826 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
827 address* signature_handler_addr() const { return native_function_addr() + 1; }
828 };
831 // Utility class for compressing line number tables
833 class CompressedLineNumberWriteStream: public CompressedWriteStream {
834 private:
835 int _bci;
836 int _line;
837 public:
838 // Constructor
839 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
840 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
842 // Write (bci, line number) pair to stream
843 void write_pair_regular(int bci_delta, int line_delta);
845 inline void write_pair_inline(int bci, int line) {
846 int bci_delta = bci - _bci;
847 int line_delta = line - _line;
848 _bci = bci;
849 _line = line;
850 // Skip (0,0) deltas - they do not add information and conflict with terminator.
851 if (bci_delta == 0 && line_delta == 0) return;
852 // Check if bci is 5-bit and line number 3-bit unsigned.
853 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
854 // Compress into single byte.
855 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
856 // Check that value doesn't match escape character.
857 if (value != 0xFF) {
858 write_byte(value);
859 return;
860 }
861 }
862 write_pair_regular(bci_delta, line_delta);
863 }
865 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
866 // Disabling optimization doesn't work for methods in header files
867 // so we force it to call through the non-optimized version in the .cpp.
868 // It's gross, but it's the only way we can ensure that all callers are
869 // fixed. _MSC_VER is defined by the windows compiler
870 #if defined(_M_AMD64) && _MSC_VER >= 1400
871 void write_pair(int bci, int line);
872 #else
873 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
874 #endif
876 // Write end-of-stream marker
877 void write_terminator() { write_byte(0); }
878 };
881 // Utility class for decompressing line number tables
883 class CompressedLineNumberReadStream: public CompressedReadStream {
884 private:
885 int _bci;
886 int _line;
887 public:
888 // Constructor
889 CompressedLineNumberReadStream(u_char* buffer);
890 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
891 bool read_pair();
892 // Accessing bci and line number (after calling read_pair)
893 int bci() const { return _bci; }
894 int line() const { return _line; }
895 };
898 /// Fast Breakpoints.
900 // If this structure gets more complicated (because bpts get numerous),
901 // move it into its own header.
903 // There is presently no provision for concurrent access
904 // to breakpoint lists, which is only OK for JVMTI because
905 // breakpoints are written only at safepoints, and are read
906 // concurrently only outside of safepoints.
908 class BreakpointInfo : public CHeapObj<mtClass> {
909 friend class VMStructs;
910 private:
911 Bytecodes::Code _orig_bytecode;
912 int _bci;
913 u2 _name_index; // of method
914 u2 _signature_index; // of method
915 BreakpointInfo* _next; // simple storage allocation
917 public:
918 BreakpointInfo(Method* m, int bci);
920 // accessors
921 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
922 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
923 int bci() { return _bci; }
925 BreakpointInfo* next() const { return _next; }
926 void set_next(BreakpointInfo* n) { _next = n; }
928 // helps for searchers
929 bool match(const Method* m, int bci) {
930 return bci == _bci && match(m);
931 }
933 bool match(const Method* m) {
934 return _name_index == m->name_index() &&
935 _signature_index == m->signature_index();
936 }
938 void set(Method* method);
939 void clear(Method* method);
940 };
942 // Utility class for access exception handlers
943 class ExceptionTable : public StackObj {
944 private:
945 ExceptionTableElement* _table;
946 u2 _length;
948 public:
949 ExceptionTable(Method* m) {
950 if (m->has_exception_handler()) {
951 _table = m->exception_table_start();
952 _length = m->exception_table_length();
953 } else {
954 _table = NULL;
955 _length = 0;
956 }
957 }
959 int length() const {
960 return _length;
961 }
963 u2 start_pc(int idx) const {
964 assert(idx < _length, "out of bounds");
965 return _table[idx].start_pc;
966 }
968 void set_start_pc(int idx, u2 value) {
969 assert(idx < _length, "out of bounds");
970 _table[idx].start_pc = value;
971 }
973 u2 end_pc(int idx) const {
974 assert(idx < _length, "out of bounds");
975 return _table[idx].end_pc;
976 }
978 void set_end_pc(int idx, u2 value) {
979 assert(idx < _length, "out of bounds");
980 _table[idx].end_pc = value;
981 }
983 u2 handler_pc(int idx) const {
984 assert(idx < _length, "out of bounds");
985 return _table[idx].handler_pc;
986 }
988 void set_handler_pc(int idx, u2 value) {
989 assert(idx < _length, "out of bounds");
990 _table[idx].handler_pc = value;
991 }
993 u2 catch_type_index(int idx) const {
994 assert(idx < _length, "out of bounds");
995 return _table[idx].catch_type_index;
996 }
998 void set_catch_type_index(int idx, u2 value) {
999 assert(idx < _length, "out of bounds");
1000 _table[idx].catch_type_index = value;
1001 }
1002 };
1004 #endif // SHARE_VM_OOPS_METHODOOP_HPP