Tue, 19 Feb 2013 11:36:52 -0500
8007153: Ensure that MethodParameters API works properly with RedefineClasses
Summary: Adds code to HotSpot to properly update MethodParameter attributes' constant pool indexes when redefineClasses is called
Reviewed-by: coleenp, sspitsyn
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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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 | intrinsic_id| flags |
77 // |------------------------------------------------------|
78 // | throwout_count | num_breakpoints |
79 // |------------------------------------------------------|
80 // | invocation_counter |
81 // | backedge_counter |
82 // |------------------------------------------------------|
83 // | prev_time (tiered only, 64 bit wide) |
84 // | |
85 // |------------------------------------------------------|
86 // | rate (tiered) |
87 // |------------------------------------------------------|
88 // | code (pointer) |
89 // | i2i (pointer) |
90 // | adapter (pointer) |
91 // | from_compiled_entry (pointer) |
92 // | from_interpreted_entry (pointer) |
93 // |------------------------------------------------------|
94 // | native_function (present only if native) |
95 // | signature_handler (present only if native) |
96 // |------------------------------------------------------|
99 class CheckedExceptionElement;
100 class LocalVariableTableElement;
101 class AdapterHandlerEntry;
102 class MethodData;
103 class ConstMethod;
104 class InlineTableSizes;
105 class KlassSizeStats;
107 class Method : public Metadata {
108 friend class VMStructs;
109 private:
110 ConstMethod* _constMethod; // Method read-only data.
111 MethodData* _method_data;
112 int _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
113 AccessFlags _access_flags; // Access flags
114 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
115 // note: can have vtables with >2**16 elements (because of inheritance)
116 #ifdef CC_INTERP
117 int _result_index; // C++ interpreter needs for converting results to/from stack
118 #endif
119 u2 _method_size; // size of this object
120 u1 _intrinsic_id; // vmSymbols::intrinsic_id (0 == _none)
121 u1 _jfr_towrite : 1, // Flags
122 _force_inline : 1,
123 _hidden : 1,
124 _dont_inline : 1,
125 : 4;
126 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
127 u2 _number_of_breakpoints; // fullspeed debugging support
128 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
129 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
131 #ifdef TIERED
132 float _rate; // Events (invocation and backedge counter increments) per millisecond
133 jlong _prev_time; // Previous time the rate was acquired
134 #endif
136 #ifndef PRODUCT
137 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
138 #endif
139 // Entry point for calling both from and to the interpreter.
140 address _i2i_entry; // All-args-on-stack calling convention
141 // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
142 AdapterHandlerEntry* _adapter;
143 // Entry point for calling from compiled code, to compiled code if it exists
144 // or else the interpreter.
145 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
146 // The entry point for calling both from and to compiled code is
147 // "_code->entry_point()". Because of tiered compilation and de-opt, this
148 // field can come and go. It can transition from NULL to not-null at any
149 // time (whenever a compile completes). It can transition from not-null to
150 // NULL only at safepoints (because of a de-opt).
151 nmethod* volatile _code; // Points to the corresponding piece of native code
152 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
154 // Constructor
155 Method(ConstMethod* xconst, AccessFlags access_flags, int size);
156 public:
158 static Method* allocate(ClassLoaderData* loader_data,
159 int byte_code_size,
160 AccessFlags access_flags,
161 InlineTableSizes* sizes,
162 ConstMethod::MethodType method_type,
163 TRAPS);
165 // CDS and vtbl checking can create an empty Method to get vtbl pointer.
166 Method(){}
168 // The Method vtable is restored by this call when the Method is in the
169 // shared archive. See patch_klass_vtables() in metaspaceShared.cpp for
170 // all the gory details. SA, dtrace and pstack helpers distinguish metadata
171 // by their vtable.
172 void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
173 bool is_method() const volatile { return true; }
175 // accessors for instance variables
177 ConstMethod* constMethod() const { return _constMethod; }
178 void set_constMethod(ConstMethod* xconst) { _constMethod = xconst; }
181 static address make_adapters(methodHandle mh, TRAPS);
182 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
183 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
185 // access flag
186 AccessFlags access_flags() const { return _access_flags; }
187 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
189 // name
190 Symbol* name() const { return constants()->symbol_at(name_index()); }
191 int name_index() const { return constMethod()->name_index(); }
192 void set_name_index(int index) { constMethod()->set_name_index(index); }
194 // signature
195 Symbol* signature() const { return constants()->symbol_at(signature_index()); }
196 int signature_index() const { return constMethod()->signature_index(); }
197 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
199 // generics support
200 Symbol* generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
201 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
202 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
204 // annotations support
205 AnnotationArray* annotations() const {
206 return constMethod()->method_annotations();
207 }
208 AnnotationArray* parameter_annotations() const {
209 return constMethod()->parameter_annotations();
210 }
211 AnnotationArray* annotation_default() const {
212 return constMethod()->default_annotations();
213 }
214 AnnotationArray* type_annotations() const {
215 return constMethod()->type_annotations();
216 }
218 #ifdef CC_INTERP
219 void set_result_index(BasicType type);
220 int result_index() { return _result_index; }
221 #endif
223 // Helper routine: get klass name + "." + method name + signature as
224 // C string, for the purpose of providing more useful NoSuchMethodErrors
225 // and fatal error handling. The string is allocated in resource
226 // area if a buffer is not provided by the caller.
227 char* name_and_sig_as_C_string() const;
228 char* name_and_sig_as_C_string(char* buf, int size) const;
230 // Static routine in the situations we don't have a Method*
231 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
232 static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
234 Bytecodes::Code java_code_at(int bci) const {
235 return Bytecodes::java_code_at(this, bcp_from(bci));
236 }
237 Bytecodes::Code code_at(int bci) const {
238 return Bytecodes::code_at(this, bcp_from(bci));
239 }
241 // JVMTI breakpoints
242 Bytecodes::Code orig_bytecode_at(int bci) const;
243 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
244 void set_breakpoint(int bci);
245 void clear_breakpoint(int bci);
246 void clear_all_breakpoints();
247 // Tracking number of breakpoints, for fullspeed debugging.
248 // Only mutated by VM thread.
249 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
250 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
251 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
252 // Initialization only
253 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
255 // index into InstanceKlass methods() array
256 // note: also used by jfr
257 u2 method_idnum() const { return constMethod()->method_idnum(); }
258 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
260 // code size
261 int code_size() const { return constMethod()->code_size(); }
263 // method size
264 int method_size() const { return _method_size; }
265 void set_method_size(int size) {
266 assert(0 <= size && size < (1 << 16), "invalid method size");
267 _method_size = size;
268 }
270 // constant pool for Klass* holding this method
271 ConstantPool* constants() const { return constMethod()->constants(); }
272 void set_constants(ConstantPool* c) { constMethod()->set_constants(c); }
274 // max stack
275 // return original max stack size for method verification
276 int verifier_max_stack() const { return constMethod()->max_stack(); }
277 int max_stack() const { return constMethod()->max_stack() + extra_stack_entries(); }
278 void set_max_stack(int size) { constMethod()->set_max_stack(size); }
280 // max locals
281 int max_locals() const { return constMethod()->max_locals(); }
282 void set_max_locals(int size) { constMethod()->set_max_locals(size); }
284 int highest_comp_level() const;
285 void set_highest_comp_level(int level);
286 int highest_osr_comp_level() const;
287 void set_highest_osr_comp_level(int level);
289 // Count of times method was exited via exception while interpreting
290 void interpreter_throwout_increment() {
291 if (_interpreter_throwout_count < 65534) {
292 _interpreter_throwout_count++;
293 }
294 }
296 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
297 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
299 // size of parameters
300 int size_of_parameters() const { return constMethod()->size_of_parameters(); }
301 void set_size_of_parameters(int size) { constMethod()->set_size_of_parameters(size); }
303 bool has_stackmap_table() const {
304 return constMethod()->has_stackmap_table();
305 }
307 Array<u1>* stackmap_data() const {
308 return constMethod()->stackmap_data();
309 }
311 void set_stackmap_data(Array<u1>* sd) {
312 constMethod()->set_stackmap_data(sd);
313 }
315 // exception handler table
316 bool has_exception_handler() const
317 { return constMethod()->has_exception_handler(); }
318 int exception_table_length() const
319 { return constMethod()->exception_table_length(); }
320 ExceptionTableElement* exception_table_start() const
321 { return constMethod()->exception_table_start(); }
323 // Finds the first entry point bci of an exception handler for an
324 // exception of klass ex_klass thrown at throw_bci. A value of NULL
325 // for ex_klass indicates that the exception klass is not known; in
326 // this case it matches any constraint class. Returns -1 if the
327 // exception cannot be handled in this method. The handler
328 // constraint classes are loaded if necessary. Note that this may
329 // throw an exception if loading of the constraint classes causes
330 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
331 // If an exception is thrown, returns the bci of the
332 // exception handler which caused the exception to be thrown, which
333 // is needed for proper retries. See, for example,
334 // InterpreterRuntime::exception_handler_for_exception.
335 static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS);
337 // method data access
338 MethodData* method_data() const {
339 return _method_data;
340 }
341 void set_method_data(MethodData* data) {
342 _method_data = data;
343 }
345 // invocation counter
346 InvocationCounter* invocation_counter() { return &_invocation_counter; }
347 InvocationCounter* backedge_counter() { return &_backedge_counter; }
349 #ifdef TIERED
350 // We are reusing interpreter_invocation_count as a holder for the previous event count!
351 // We can do that since interpreter_invocation_count is not used in tiered.
352 int prev_event_count() const { return _interpreter_invocation_count; }
353 void set_prev_event_count(int count) { _interpreter_invocation_count = count; }
354 jlong prev_time() const { return _prev_time; }
355 void set_prev_time(jlong time) { _prev_time = time; }
356 float rate() const { return _rate; }
357 void set_rate(float rate) { _rate = rate; }
358 #endif
360 int invocation_count();
361 int backedge_count();
363 bool was_executed_more_than(int n);
364 bool was_never_executed() { return !was_executed_more_than(0); }
366 static void build_interpreter_method_data(methodHandle method, TRAPS);
368 int interpreter_invocation_count() {
369 if (TieredCompilation) return invocation_count();
370 else return _interpreter_invocation_count;
371 }
372 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
373 int increment_interpreter_invocation_count() {
374 if (TieredCompilation) ShouldNotReachHere();
375 return ++_interpreter_invocation_count;
376 }
378 #ifndef PRODUCT
379 int compiled_invocation_count() const { return _compiled_invocation_count; }
380 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
381 #endif // not PRODUCT
383 // Clear (non-shared space) pointers which could not be relevant
384 // if this (shared) method were mapped into another JVM.
385 void remove_unshareable_info();
387 // nmethod/verified compiler entry
388 address verified_code_entry();
389 bool check_code() const; // Not inline to avoid circular ref
390 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
391 void clear_code(); // Clear out any compiled code
392 static void set_code(methodHandle mh, nmethod* code);
393 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
394 address get_i2c_entry();
395 address get_c2i_entry();
396 address get_c2i_unverified_entry();
397 AdapterHandlerEntry* adapter() { return _adapter; }
398 // setup entry points
399 void link_method(methodHandle method, TRAPS);
400 // clear entry points. Used by sharing code
401 void unlink_method();
403 // vtable index
404 enum VtableIndexFlag {
405 // Valid vtable indexes are non-negative (>= 0).
406 // These few negative values are used as sentinels.
407 highest_unused_vtable_index_value = -5,
408 invalid_vtable_index = -4, // distinct from any valid vtable index
409 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
410 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
411 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
412 };
413 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
414 int vtable_index() const { assert(valid_vtable_index(), "");
415 return _vtable_index; }
416 void set_vtable_index(int index) { _vtable_index = index; }
418 // interpreter entry
419 address interpreter_entry() const { return _i2i_entry; }
420 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
421 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
423 // native function (used for native methods only)
424 enum {
425 native_bind_event_is_interesting = true
426 };
427 address native_function() const { return *(native_function_addr()); }
428 address critical_native_function();
430 // Must specify a real function (not NULL).
431 // Use clear_native_function() to unregister.
432 void set_native_function(address function, bool post_event_flag);
433 bool has_native_function() const;
434 void clear_native_function();
436 // signature handler (used for native methods only)
437 address signature_handler() const { return *(signature_handler_addr()); }
438 void set_signature_handler(address handler);
440 // Interpreter oopmap support
441 void mask_for(int bci, InterpreterOopMap* mask);
443 #ifndef PRODUCT
444 // operations on invocation counter
445 void print_invocation_count();
446 #endif
448 // byte codes
449 void set_code(address code) { return constMethod()->set_code(code); }
450 address code_base() const { return constMethod()->code_base(); }
451 bool contains(address bcp) const { return constMethod()->contains(bcp); }
453 // prints byte codes
454 void print_codes() const { print_codes_on(tty); }
455 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
456 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
458 // method parameters
459 bool has_method_parameters() const
460 { return constMethod()->has_method_parameters(); }
461 int method_parameters_length() const
462 { return constMethod()->method_parameters_length(); }
463 MethodParametersElement* method_parameters_start() const
464 { return constMethod()->method_parameters_start(); }
466 // checked exceptions
467 int checked_exceptions_length() const
468 { return constMethod()->checked_exceptions_length(); }
469 CheckedExceptionElement* checked_exceptions_start() const
470 { return constMethod()->checked_exceptions_start(); }
472 // localvariable table
473 bool has_localvariable_table() const
474 { return constMethod()->has_localvariable_table(); }
475 int localvariable_table_length() const
476 { return constMethod()->localvariable_table_length(); }
477 LocalVariableTableElement* localvariable_table_start() const
478 { return constMethod()->localvariable_table_start(); }
480 bool has_linenumber_table() const
481 { return constMethod()->has_linenumber_table(); }
482 u_char* compressed_linenumber_table() const
483 { return constMethod()->compressed_linenumber_table(); }
485 // method holder (the Klass* holding this method)
486 InstanceKlass* method_holder() const { return constants()->pool_holder(); }
488 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
489 Symbol* klass_name() const; // returns the name of the method holder
490 BasicType result_type() const; // type of the method result
491 int result_type_index() const; // type index of the method result
492 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
493 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
495 // Checked exceptions thrown by this method (resolved to mirrors)
496 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
498 // Access flags
499 bool is_public() const { return access_flags().is_public(); }
500 bool is_private() const { return access_flags().is_private(); }
501 bool is_protected() const { return access_flags().is_protected(); }
502 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
503 bool is_static() const { return access_flags().is_static(); }
504 bool is_final() const { return access_flags().is_final(); }
505 bool is_synchronized() const { return access_flags().is_synchronized();}
506 bool is_native() const { return access_flags().is_native(); }
507 bool is_abstract() const { return access_flags().is_abstract(); }
508 bool is_strict() const { return access_flags().is_strict(); }
509 bool is_synthetic() const { return access_flags().is_synthetic(); }
511 // returns true if contains only return operation
512 bool is_empty_method() const;
514 // returns true if this is a vanilla constructor
515 bool is_vanilla_constructor() const;
517 // checks method and its method holder
518 bool is_final_method() const;
519 bool is_strict_method() const;
521 // true if method needs no dynamic dispatch (final and/or no vtable entry)
522 bool can_be_statically_bound() const;
524 // returns true if the method has any backward branches.
525 bool has_loops() {
526 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
527 };
529 bool compute_has_loops_flag();
531 bool has_jsrs() {
532 return access_flags().has_jsrs();
533 };
534 void set_has_jsrs() {
535 _access_flags.set_has_jsrs();
536 }
538 // returns true if the method has any monitors.
539 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
540 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
542 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
544 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
545 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
546 // has not been computed yet.
547 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
548 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
550 // returns true if the method is an accessor function (setter/getter).
551 bool is_accessor() const;
553 // returns true if the method is an initializer (<init> or <clinit>).
554 bool is_initializer() const;
556 // returns true if the method is static OR if the classfile version < 51
557 bool has_valid_initializer_flags() const;
559 // returns true if the method name is <clinit> and the method has
560 // valid static initializer flags.
561 bool is_static_initializer() const;
563 // compiled code support
564 // NOTE: code() is inherently racy as deopt can be clearing code
565 // simultaneously. Use with caution.
566 bool has_compiled_code() const { return code() != NULL; }
568 // sizing
569 static int header_size() { return sizeof(Method)/HeapWordSize; }
570 static int size(bool is_native);
571 int size() const { return method_size(); }
572 #if INCLUDE_SERVICES
573 void collect_statistics(KlassSizeStats *sz) const;
574 #endif
576 // interpreter support
577 static ByteSize const_offset() { return byte_offset_of(Method, _constMethod ); }
578 static ByteSize access_flags_offset() { return byte_offset_of(Method, _access_flags ); }
579 #ifdef CC_INTERP
580 static ByteSize result_index_offset() { return byte_offset_of(Method, _result_index ); }
581 #endif /* CC_INTERP */
582 static ByteSize from_compiled_offset() { return byte_offset_of(Method, _from_compiled_entry); }
583 static ByteSize code_offset() { return byte_offset_of(Method, _code); }
584 static ByteSize invocation_counter_offset() { return byte_offset_of(Method, _invocation_counter); }
585 static ByteSize backedge_counter_offset() { return byte_offset_of(Method, _backedge_counter); }
586 static ByteSize method_data_offset() {
587 return byte_offset_of(Method, _method_data);
588 }
589 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(Method, _interpreter_invocation_count); }
590 #ifndef PRODUCT
591 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
592 #endif // not PRODUCT
593 static ByteSize native_function_offset() { return in_ByteSize(sizeof(Method)); }
594 static ByteSize from_interpreted_offset() { return byte_offset_of(Method, _from_interpreted_entry ); }
595 static ByteSize interpreter_entry_offset() { return byte_offset_of(Method, _i2i_entry ); }
596 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(Method) + wordSize); }
598 // for code generation
599 static int method_data_offset_in_bytes() { return offset_of(Method, _method_data); }
600 static int interpreter_invocation_counter_offset_in_bytes()
601 { return offset_of(Method, _interpreter_invocation_count); }
602 static int intrinsic_id_offset_in_bytes() { return offset_of(Method, _intrinsic_id); }
603 static int intrinsic_id_size_in_bytes() { return sizeof(u1); }
605 // Static methods that are used to implement member methods where an exposed this pointer
606 // is needed due to possible GCs
607 static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS);
609 // Returns the byte code index from the byte code pointer
610 int bci_from(address bcp) const;
611 address bcp_from(int bci) const;
612 int validate_bci_from_bcx(intptr_t bcx) const;
614 // Returns the line number for a bci if debugging information for the method is prowided,
615 // -1 is returned otherwise.
616 int line_number_from_bci(int bci) const;
618 // Reflection support
619 bool is_overridden_in(Klass* k) const;
621 // JSR 292 support
622 bool is_method_handle_intrinsic() const; // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
623 bool is_compiled_lambda_form() const; // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
624 bool has_member_arg() const; // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
625 static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
626 Symbol* signature, //anything at all
627 TRAPS);
628 static Klass* check_non_bcp_klass(Klass* klass);
629 // these operate only on invoke methods:
630 // presize interpreter frames for extra interpreter stack entries, if needed
631 // method handles want to be able to push a few extra values (e.g., a bound receiver), and
632 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
633 // all without checking for a stack overflow
634 static int extra_stack_entries() { return EnableInvokeDynamic ? 2 : 0; }
635 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize()
637 // RedefineClasses() support:
638 bool is_old() const { return access_flags().is_old(); }
639 void set_is_old() { _access_flags.set_is_old(); }
640 bool is_obsolete() const { return access_flags().is_obsolete(); }
641 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
642 bool on_stack() const { return access_flags().on_stack(); }
643 void set_on_stack(const bool value);
645 // see the definition in Method*.cpp for the gory details
646 bool should_not_be_cached() const;
648 // JVMTI Native method prefixing support:
649 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
650 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
652 // Rewriting support
653 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
654 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
656 // jmethodID handling
657 // Because the useful life-span of a jmethodID cannot be determined,
658 // once created they are never reclaimed. The methods to which they refer,
659 // however, can be GC'ed away if the class is unloaded or if the method is
660 // made obsolete or deleted -- in these cases, the jmethodID
661 // refers to NULL (as is the case for any weak reference).
662 static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
663 static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
665 // Use resolve_jmethod_id() in situations where the caller is expected
666 // to provide a valid jmethodID; the only sanity checks are in asserts;
667 // result guaranteed not to be NULL.
668 inline static Method* resolve_jmethod_id(jmethodID mid) {
669 assert(mid != NULL, "JNI method id should not be null");
670 return *((Method**)mid);
671 }
673 // Use checked_resolve_jmethod_id() in situations where the caller
674 // should provide a valid jmethodID, but might not. NULL is returned
675 // when the jmethodID does not refer to a valid method.
676 static Method* checked_resolve_jmethod_id(jmethodID mid);
678 static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
679 static bool is_method_id(jmethodID mid);
681 // Clear methods
682 static void clear_jmethod_ids(ClassLoaderData* loader_data);
683 static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
685 // Get this method's jmethodID -- allocate if it doesn't exist
686 jmethodID jmethod_id() { methodHandle this_h(this);
687 return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
689 // Lookup the jmethodID for this method. Return NULL if not found.
690 // NOTE that this function can be called from a signal handler
691 // (see AsyncGetCallTrace support for Forte Analyzer) and this
692 // needs to be async-safe. No allocation should be done and
693 // so handles are not used to avoid deadlock.
694 jmethodID find_jmethod_id_or_null() { return method_holder()->jmethod_id_or_null(this); }
696 // JNI static invoke cached itable index accessors
697 int cached_itable_index() { return method_holder()->cached_itable_index(method_idnum()); }
698 void set_cached_itable_index(int index) { method_holder()->set_cached_itable_index(method_idnum(), index); }
700 // Support for inlining of intrinsic methods
701 vmIntrinsics::ID intrinsic_id() const { return (vmIntrinsics::ID) _intrinsic_id; }
702 void set_intrinsic_id(vmIntrinsics::ID id) { _intrinsic_id = (u1) id; }
704 // Helper routines for intrinsic_id() and vmIntrinsics::method().
705 void init_intrinsic_id(); // updates from _none if a match
706 static vmSymbols::SID klass_id_for_intrinsics(Klass* holder);
708 bool jfr_towrite() { return _jfr_towrite; }
709 void set_jfr_towrite(bool towrite) { _jfr_towrite = towrite; }
711 bool force_inline() { return _force_inline; }
712 void set_force_inline(bool x) { _force_inline = x; }
713 bool dont_inline() { return _dont_inline; }
714 void set_dont_inline(bool x) { _dont_inline = x; }
715 bool is_hidden() { return _hidden; }
716 void set_hidden(bool x) { _hidden = x; }
717 ConstMethod::MethodType method_type() const {
718 return _constMethod->method_type();
719 }
720 bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
722 // On-stack replacement support
723 bool has_osr_nmethod(int level, bool match_level) {
724 return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
725 }
727 nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
728 return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
729 }
731 // Inline cache support
732 void cleanup_inline_caches();
734 // Find if klass for method is loaded
735 bool is_klass_loaded_by_klass_index(int klass_index) const;
736 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
738 // Indicates whether compilation failed earlier for this method, or
739 // whether it is not compilable for another reason like having a
740 // breakpoint set in it.
741 bool is_not_compilable(int comp_level = CompLevel_any) const;
742 void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
743 void set_not_compilable_quietly(int comp_level = CompLevel_all) {
744 set_not_compilable(comp_level, false);
745 }
746 bool is_not_osr_compilable(int comp_level = CompLevel_any) const;
747 void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
748 void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
749 set_not_osr_compilable(comp_level, false);
750 }
752 private:
753 void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
755 public:
756 bool is_not_c1_compilable() const { return access_flags().is_not_c1_compilable(); }
757 void set_not_c1_compilable() { _access_flags.set_not_c1_compilable(); }
758 bool is_not_c2_compilable() const { return access_flags().is_not_c2_compilable(); }
759 void set_not_c2_compilable() { _access_flags.set_not_c2_compilable(); }
761 bool is_not_c1_osr_compilable() const { return is_not_c1_compilable(); } // don't waste an accessFlags bit
762 void set_not_c1_osr_compilable() { set_not_c1_compilable(); } // don't waste an accessFlags bit
763 bool is_not_c2_osr_compilable() const { return access_flags().is_not_c2_osr_compilable(); }
764 void set_not_c2_osr_compilable() { _access_flags.set_not_c2_osr_compilable(); }
766 // Background compilation support
767 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
768 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
769 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
771 // Resolve all classes in signature, return 'true' if successful
772 static bool load_signature_classes(methodHandle m, TRAPS);
774 // Return if true if not all classes references in signature, including return type, has been loaded
775 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
777 // Printing
778 void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
779 #if INCLUDE_JVMTI
780 void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
781 #else
782 void print_name(outputStream* st = tty) PRODUCT_RETURN; // prints as "virtual void foo(int)"
783 #endif
785 // Helper routine used for method sorting
786 static void sort_methods(Array<Method*>* methods, bool idempotent = false);
788 // Deallocation function for redefine classes or if an error occurs
789 void deallocate_contents(ClassLoaderData* loader_data);
791 // Printing
792 #ifndef PRODUCT
793 void print_on(outputStream* st) const;
794 #endif
795 void print_value_on(outputStream* st) const;
797 const char* internal_name() const { return "{method}"; }
799 // Check for valid method pointer
800 bool is_valid_method() const;
802 // Verify
803 void verify() { verify_on(tty); }
804 void verify_on(outputStream* st);
806 private:
808 // Inlined elements
809 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
810 address* signature_handler_addr() const { return native_function_addr() + 1; }
811 };
814 // Utility class for compressing line number tables
816 class CompressedLineNumberWriteStream: public CompressedWriteStream {
817 private:
818 int _bci;
819 int _line;
820 public:
821 // Constructor
822 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
823 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
825 // Write (bci, line number) pair to stream
826 void write_pair_regular(int bci_delta, int line_delta);
828 inline void write_pair_inline(int bci, int line) {
829 int bci_delta = bci - _bci;
830 int line_delta = line - _line;
831 _bci = bci;
832 _line = line;
833 // Skip (0,0) deltas - they do not add information and conflict with terminator.
834 if (bci_delta == 0 && line_delta == 0) return;
835 // Check if bci is 5-bit and line number 3-bit unsigned.
836 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
837 // Compress into single byte.
838 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
839 // Check that value doesn't match escape character.
840 if (value != 0xFF) {
841 write_byte(value);
842 return;
843 }
844 }
845 write_pair_regular(bci_delta, line_delta);
846 }
848 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
849 // Disabling optimization doesn't work for methods in header files
850 // so we force it to call through the non-optimized version in the .cpp.
851 // It's gross, but it's the only way we can ensure that all callers are
852 // fixed. _MSC_VER is defined by the windows compiler
853 #if defined(_M_AMD64) && _MSC_VER >= 1400
854 void write_pair(int bci, int line);
855 #else
856 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
857 #endif
859 // Write end-of-stream marker
860 void write_terminator() { write_byte(0); }
861 };
864 // Utility class for decompressing line number tables
866 class CompressedLineNumberReadStream: public CompressedReadStream {
867 private:
868 int _bci;
869 int _line;
870 public:
871 // Constructor
872 CompressedLineNumberReadStream(u_char* buffer);
873 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
874 bool read_pair();
875 // Accessing bci and line number (after calling read_pair)
876 int bci() const { return _bci; }
877 int line() const { return _line; }
878 };
881 /// Fast Breakpoints.
883 // If this structure gets more complicated (because bpts get numerous),
884 // move it into its own header.
886 // There is presently no provision for concurrent access
887 // to breakpoint lists, which is only OK for JVMTI because
888 // breakpoints are written only at safepoints, and are read
889 // concurrently only outside of safepoints.
891 class BreakpointInfo : public CHeapObj<mtClass> {
892 friend class VMStructs;
893 private:
894 Bytecodes::Code _orig_bytecode;
895 int _bci;
896 u2 _name_index; // of method
897 u2 _signature_index; // of method
898 BreakpointInfo* _next; // simple storage allocation
900 public:
901 BreakpointInfo(Method* m, int bci);
903 // accessors
904 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
905 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
906 int bci() { return _bci; }
908 BreakpointInfo* next() const { return _next; }
909 void set_next(BreakpointInfo* n) { _next = n; }
911 // helps for searchers
912 bool match(const Method* m, int bci) {
913 return bci == _bci && match(m);
914 }
916 bool match(const Method* m) {
917 return _name_index == m->name_index() &&
918 _signature_index == m->signature_index();
919 }
921 void set(Method* method);
922 void clear(Method* method);
923 };
925 // Utility class for access exception handlers
926 class ExceptionTable : public StackObj {
927 private:
928 ExceptionTableElement* _table;
929 u2 _length;
931 public:
932 ExceptionTable(Method* m) {
933 if (m->has_exception_handler()) {
934 _table = m->exception_table_start();
935 _length = m->exception_table_length();
936 } else {
937 _table = NULL;
938 _length = 0;
939 }
940 }
942 int length() const {
943 return _length;
944 }
946 u2 start_pc(int idx) const {
947 assert(idx < _length, "out of bounds");
948 return _table[idx].start_pc;
949 }
951 void set_start_pc(int idx, u2 value) {
952 assert(idx < _length, "out of bounds");
953 _table[idx].start_pc = value;
954 }
956 u2 end_pc(int idx) const {
957 assert(idx < _length, "out of bounds");
958 return _table[idx].end_pc;
959 }
961 void set_end_pc(int idx, u2 value) {
962 assert(idx < _length, "out of bounds");
963 _table[idx].end_pc = value;
964 }
966 u2 handler_pc(int idx) const {
967 assert(idx < _length, "out of bounds");
968 return _table[idx].handler_pc;
969 }
971 void set_handler_pc(int idx, u2 value) {
972 assert(idx < _length, "out of bounds");
973 _table[idx].handler_pc = value;
974 }
976 u2 catch_type_index(int idx) const {
977 assert(idx < _length, "out of bounds");
978 return _table[idx].catch_type_index;
979 }
981 void set_catch_type_index(int idx, u2 value) {
982 assert(idx < _length, "out of bounds");
983 _table[idx].catch_type_index = value;
984 }
985 };
987 #endif // SHARE_VM_OOPS_METHODOOP_HPP