Tue, 21 Apr 2009 23:21:04 -0700
6655646: dynamic languages need dynamically linked call sites
Summary: invokedynamic instruction (JSR 292 RI)
Reviewed-by: twisti, never
1 /*
2 * Copyright 1997-2009 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
25 // A methodOop represents a Java method.
26 //
27 // Memory layout (each line represents a word). Note that most applications load thousands of methods,
28 // so keeping the size of this structure small has a big impact on footprint.
29 //
30 // We put all oops and method_size first for better gc cache locality.
31 //
32 // The actual bytecodes are inlined after the end of the methodOopDesc struct.
33 //
34 // There are bits in the access_flags telling whether inlined tables are present.
35 // Note that accessing the line number and local variable tables is not performance critical at all.
36 // Accessing the checked exceptions table is used by reflection, so we put that last to make access
37 // to it fast.
38 //
39 // The line number table is compressed and inlined following the byte codes. It is found as the first
40 // byte following the byte codes. The checked exceptions table and the local variable table are inlined
41 // after the line number table, and indexed from the end of the method. We do not compress the checked
42 // exceptions table since the average length is less than 2, and do not bother to compress the local
43 // variable table either since it is mostly absent.
44 //
45 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter)
46 //
47 // |------------------------------------------------------|
48 // | header |
49 // | klass |
50 // |------------------------------------------------------|
51 // | constMethodOop (oop) |
52 // | constants (oop) |
53 // |------------------------------------------------------|
54 // | methodData (oop) |
55 // | interp_invocation_count |
56 // |------------------------------------------------------|
57 // | access_flags |
58 // | vtable_index |
59 // |------------------------------------------------------|
60 // | result_index (C++ interpreter only) |
61 // |------------------------------------------------------|
62 // | method_size | max_stack |
63 // | max_locals | size_of_parameters |
64 // |------------------------------------------------------|
65 // | intrinsic_id, highest_tier | (unused) |
66 // |------------------------------------------------------|
67 // | throwout_count | num_breakpoints |
68 // |------------------------------------------------------|
69 // | invocation_counter |
70 // | backedge_counter |
71 // |------------------------------------------------------|
72 // | code (pointer) |
73 // | i2i (pointer) |
74 // | adapter (pointer) |
75 // | from_compiled_entry (pointer) |
76 // | from_interpreted_entry (pointer) |
77 // |------------------------------------------------------|
78 // | native_function (present only if native) |
79 // | signature_handler (present only if native) |
80 // |------------------------------------------------------|
83 class CheckedExceptionElement;
84 class LocalVariableTableElement;
85 class AdapterHandlerEntry;
87 class methodDataOopDesc;
89 class methodOopDesc : public oopDesc {
90 friend class methodKlass;
91 friend class VMStructs;
92 private:
93 constMethodOop _constMethod; // Method read-only data.
94 constantPoolOop _constants; // Constant pool
95 methodDataOop _method_data;
96 int _interpreter_invocation_count; // Count of times invoked
97 AccessFlags _access_flags; // Access flags
98 int _vtable_index; // vtable index of this method (see VtableIndexFlag)
99 // note: can have vtables with >2**16 elements (because of inheritance)
100 #ifdef CC_INTERP
101 int _result_index; // C++ interpreter needs for converting results to/from stack
102 #endif
103 u2 _method_size; // size of this object
104 u2 _max_stack; // Maximum number of entries on the expression stack
105 u2 _max_locals; // Number of local variables used by this method
106 u2 _size_of_parameters; // size of the parameter block (receiver + arguments) in words
107 u1 _intrinsic_id_cache; // Cache for intrinsic_id; 0 or 1+vmInt::ID
108 u1 _highest_tier_compile; // Highest compile level this method has ever seen.
109 u2 _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
110 u2 _number_of_breakpoints; // fullspeed debugging support
111 InvocationCounter _invocation_counter; // Incremented before each activation of the method - used to trigger frequency-based optimizations
112 InvocationCounter _backedge_counter; // Incremented before each backedge taken - used to trigger frequencey-based optimizations
113 #ifndef PRODUCT
114 int _compiled_invocation_count; // Number of nmethod invocations so far (for perf. debugging)
115 #endif
116 // Entry point for calling both from and to the interpreter.
117 address _i2i_entry; // All-args-on-stack calling convention
118 // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked.
119 AdapterHandlerEntry* _adapter;
120 // Entry point for calling from compiled code, to compiled code if it exists
121 // or else the interpreter.
122 volatile address _from_compiled_entry; // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
123 // The entry point for calling both from and to compiled code is
124 // "_code->entry_point()". Because of tiered compilation and de-opt, this
125 // field can come and go. It can transition from NULL to not-null at any
126 // time (whenever a compile completes). It can transition from not-null to
127 // NULL only at safepoints (because of a de-opt).
128 nmethod* volatile _code; // Points to the corresponding piece of native code
129 volatile address _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
131 public:
133 static const bool IsUnsafeConc = false;
134 static const bool IsSafeConc = true;
136 // accessors for instance variables
137 constMethodOop constMethod() const { return _constMethod; }
138 void set_constMethod(constMethodOop xconst) { oop_store_without_check((oop*)&_constMethod, (oop)xconst); }
141 static address make_adapters(methodHandle mh, TRAPS);
142 volatile address from_compiled_entry() const { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
143 volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
145 // access flag
146 AccessFlags access_flags() const { return _access_flags; }
147 void set_access_flags(AccessFlags flags) { _access_flags = flags; }
149 // name
150 symbolOop name() const { return _constants->symbol_at(name_index()); }
151 int name_index() const { return constMethod()->name_index(); }
152 void set_name_index(int index) { constMethod()->set_name_index(index); }
154 // signature
155 symbolOop signature() const { return _constants->symbol_at(signature_index()); }
156 int signature_index() const { return constMethod()->signature_index(); }
157 void set_signature_index(int index) { constMethod()->set_signature_index(index); }
159 // generics support
160 symbolOop generic_signature() const { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); }
161 int generic_signature_index() const { return constMethod()->generic_signature_index(); }
162 void set_generic_signature_index(int index) { constMethod()->set_generic_signature_index(index); }
164 // annotations support
165 typeArrayOop annotations() const { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); }
166 typeArrayOop parameter_annotations() const { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); }
167 typeArrayOop annotation_default() const { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); }
169 #ifdef CC_INTERP
170 void set_result_index(BasicType type);
171 int result_index() { return _result_index; }
172 #endif
174 // Helper routine: get klass name + "." + method name + signature as
175 // C string, for the purpose of providing more useful NoSuchMethodErrors
176 // and fatal error handling. The string is allocated in resource
177 // area if a buffer is not provided by the caller.
178 char* name_and_sig_as_C_string();
179 char* name_and_sig_as_C_string(char* buf, int size);
181 // Static routine in the situations we don't have a methodOop
182 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature);
183 static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size);
185 // JVMTI breakpoints
186 Bytecodes::Code orig_bytecode_at(int bci);
187 void set_orig_bytecode_at(int bci, Bytecodes::Code code);
188 void set_breakpoint(int bci);
189 void clear_breakpoint(int bci);
190 void clear_all_breakpoints();
191 // Tracking number of breakpoints, for fullspeed debugging.
192 // Only mutated by VM thread.
193 u2 number_of_breakpoints() const { return _number_of_breakpoints; }
194 void incr_number_of_breakpoints() { ++_number_of_breakpoints; }
195 void decr_number_of_breakpoints() { --_number_of_breakpoints; }
196 // Initialization only
197 void clear_number_of_breakpoints() { _number_of_breakpoints = 0; }
199 // index into instanceKlass methods() array
200 u2 method_idnum() const { return constMethod()->method_idnum(); }
201 void set_method_idnum(u2 idnum) { constMethod()->set_method_idnum(idnum); }
203 // code size
204 int code_size() const { return constMethod()->code_size(); }
206 // method size
207 int method_size() const { return _method_size; }
208 void set_method_size(int size) {
209 assert(0 <= size && size < (1 << 16), "invalid method size");
210 _method_size = size;
211 }
213 // constant pool for klassOop holding this method
214 constantPoolOop constants() const { return _constants; }
215 void set_constants(constantPoolOop c) { oop_store_without_check((oop*)&_constants, c); }
217 // max stack
218 int max_stack() const { return _max_stack; }
219 void set_max_stack(int size) { _max_stack = size; }
221 // max locals
222 int max_locals() const { return _max_locals; }
223 void set_max_locals(int size) { _max_locals = size; }
224 int highest_tier_compile() { return _highest_tier_compile;}
225 void set_highest_tier_compile(int level) { _highest_tier_compile = level;}
227 void clear_intrinsic_id_cache() { _intrinsic_id_cache = 0; }
229 // Count of times method was exited via exception while interpreting
230 void interpreter_throwout_increment() {
231 if (_interpreter_throwout_count < 65534) {
232 _interpreter_throwout_count++;
233 }
234 }
236 int interpreter_throwout_count() const { return _interpreter_throwout_count; }
237 void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
239 // size of parameters
240 int size_of_parameters() const { return _size_of_parameters; }
242 bool has_stackmap_table() const {
243 return constMethod()->has_stackmap_table();
244 }
246 typeArrayOop stackmap_data() const {
247 return constMethod()->stackmap_data();
248 }
250 // exception handler table
251 typeArrayOop exception_table() const
252 { return constMethod()->exception_table(); }
253 void set_exception_table(typeArrayOop e)
254 { constMethod()->set_exception_table(e); }
255 bool has_exception_handler() const
256 { return constMethod()->has_exception_handler(); }
258 // Finds the first entry point bci of an exception handler for an
259 // exception of klass ex_klass thrown at throw_bci. A value of NULL
260 // for ex_klass indicates that the exception klass is not known; in
261 // this case it matches any constraint class. Returns -1 if the
262 // exception cannot be handled in this method. The handler
263 // constraint classes are loaded if necessary. Note that this may
264 // throw an exception if loading of the constraint classes causes
265 // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
266 // If an exception is thrown, returns the bci of the
267 // exception handler which caused the exception to be thrown, which
268 // is needed for proper retries. See, for example,
269 // InterpreterRuntime::exception_handler_for_exception.
270 int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
272 // method data access
273 methodDataOop method_data() const {
274 return _method_data;
275 }
276 void set_method_data(methodDataOop data) {
277 oop_store_without_check((oop*)&_method_data, (oop)data);
278 }
280 // invocation counter
281 InvocationCounter* invocation_counter() { return &_invocation_counter; }
282 InvocationCounter* backedge_counter() { return &_backedge_counter; }
283 int invocation_count() const { return _invocation_counter.count(); }
284 int backedge_count() const { return _backedge_counter.count(); }
285 bool was_executed_more_than(int n) const;
286 bool was_never_executed() const { return !was_executed_more_than(0); }
288 static void build_interpreter_method_data(methodHandle method, TRAPS);
290 int interpreter_invocation_count() const { return _interpreter_invocation_count; }
291 void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
292 int increment_interpreter_invocation_count() { return ++_interpreter_invocation_count; }
294 #ifndef PRODUCT
295 int compiled_invocation_count() const { return _compiled_invocation_count; }
296 void set_compiled_invocation_count(int count) { _compiled_invocation_count = count; }
297 #endif // not PRODUCT
299 // Clear (non-shared space) pointers which could not be relevant
300 // if this (shared) method were mapped into another JVM.
301 void remove_unshareable_info();
303 // nmethod/verified compiler entry
304 address verified_code_entry();
305 bool check_code() const; // Not inline to avoid circular ref
306 nmethod* volatile code() const { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
307 void clear_code(); // Clear out any compiled code
308 void set_code(methodHandle mh, nmethod* code);
309 void set_adapter_entry(AdapterHandlerEntry* adapter) { _adapter = adapter; }
310 address get_i2c_entry();
311 address get_c2i_entry();
312 address get_c2i_unverified_entry();
313 AdapterHandlerEntry* adapter() { return _adapter; }
314 // setup entry points
315 void link_method(methodHandle method, TRAPS);
316 // clear entry points. Used by sharing code
317 void unlink_method();
319 // vtable index
320 enum VtableIndexFlag {
321 // Valid vtable indexes are non-negative (>= 0).
322 // These few negative values are used as sentinels.
323 highest_unused_vtable_index_value = -5,
324 invalid_vtable_index = -4, // distinct from any valid vtable index
325 garbage_vtable_index = -3, // not yet linked; no vtable layout yet
326 nonvirtual_vtable_index = -2 // there is no need for vtable dispatch
327 // 6330203 Note: Do not use -1, which was overloaded with many meanings.
328 };
329 DEBUG_ONLY(bool valid_vtable_index() const { return _vtable_index >= nonvirtual_vtable_index; })
330 int vtable_index() const { assert(valid_vtable_index(), "");
331 return _vtable_index; }
332 void set_vtable_index(int index) { _vtable_index = index; }
334 // interpreter entry
335 address interpreter_entry() const { return _i2i_entry; }
336 // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
337 void set_interpreter_entry(address entry) { _i2i_entry = entry; _from_interpreted_entry = entry; }
338 int interpreter_kind(void) {
339 return constMethod()->interpreter_kind();
340 }
341 void set_interpreter_kind();
342 void set_interpreter_kind(int kind) {
343 constMethod()->set_interpreter_kind(kind);
344 }
346 // native function (used for native methods only)
347 enum {
348 native_bind_event_is_interesting = true
349 };
350 address native_function() const { return *(native_function_addr()); }
351 // Must specify a real function (not NULL).
352 // Use clear_native_function() to unregister.
353 void set_native_function(address function, bool post_event_flag);
354 bool has_native_function() const;
355 void clear_native_function();
357 // signature handler (used for native methods only)
358 address signature_handler() const { return *(signature_handler_addr()); }
359 void set_signature_handler(address handler);
361 // Interpreter oopmap support
362 void mask_for(int bci, InterpreterOopMap* mask);
364 #ifndef PRODUCT
365 // operations on invocation counter
366 void print_invocation_count() const;
367 #endif
369 // byte codes
370 address code_base() const { return constMethod()->code_base(); }
371 bool contains(address bcp) const { return constMethod()->contains(bcp); }
373 // prints byte codes
374 void print_codes() const { print_codes_on(tty); }
375 void print_codes_on(outputStream* st) const PRODUCT_RETURN;
376 void print_codes_on(int from, int to, outputStream* st) const PRODUCT_RETURN;
378 // checked exceptions
379 int checked_exceptions_length() const
380 { return constMethod()->checked_exceptions_length(); }
381 CheckedExceptionElement* checked_exceptions_start() const
382 { return constMethod()->checked_exceptions_start(); }
384 // localvariable table
385 bool has_localvariable_table() const
386 { return constMethod()->has_localvariable_table(); }
387 int localvariable_table_length() const
388 { return constMethod()->localvariable_table_length(); }
389 LocalVariableTableElement* localvariable_table_start() const
390 { return constMethod()->localvariable_table_start(); }
392 bool has_linenumber_table() const
393 { return constMethod()->has_linenumber_table(); }
394 u_char* compressed_linenumber_table() const
395 { return constMethod()->compressed_linenumber_table(); }
397 // method holder (the klassOop holding this method)
398 klassOop method_holder() const { return _constants->pool_holder(); }
400 void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
401 symbolOop klass_name() const; // returns the name of the method holder
402 BasicType result_type() const; // type of the method result
403 int result_type_index() const; // type index of the method result
404 bool is_returning_oop() const { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
405 bool is_returning_fp() const { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
407 // Checked exceptions thrown by this method (resolved to mirrors)
408 objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
410 // Access flags
411 bool is_public() const { return access_flags().is_public(); }
412 bool is_private() const { return access_flags().is_private(); }
413 bool is_protected() const { return access_flags().is_protected(); }
414 bool is_package_private() const { return !is_public() && !is_private() && !is_protected(); }
415 bool is_static() const { return access_flags().is_static(); }
416 bool is_final() const { return access_flags().is_final(); }
417 bool is_synchronized() const { return access_flags().is_synchronized();}
418 bool is_native() const { return access_flags().is_native(); }
419 bool is_abstract() const { return access_flags().is_abstract(); }
420 bool is_strict() const { return access_flags().is_strict(); }
421 bool is_synthetic() const { return access_flags().is_synthetic(); }
423 // returns true if contains only return operation
424 bool is_empty_method() const;
426 // returns true if this is a vanilla constructor
427 bool is_vanilla_constructor() const;
429 // checks method and its method holder
430 bool is_final_method() const;
431 bool is_strict_method() const;
433 // true if method needs no dynamic dispatch (final and/or no vtable entry)
434 bool can_be_statically_bound() const;
436 // returns true if the method has any backward branches.
437 bool has_loops() {
438 return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
439 };
441 bool compute_has_loops_flag();
443 bool has_jsrs() {
444 return access_flags().has_jsrs();
445 };
446 void set_has_jsrs() {
447 _access_flags.set_has_jsrs();
448 }
450 // returns true if the method has any monitors.
451 bool has_monitors() const { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
452 bool has_monitor_bytecodes() const { return access_flags().has_monitor_bytecodes(); }
454 void set_has_monitor_bytecodes() { _access_flags.set_has_monitor_bytecodes(); }
456 // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
457 // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
458 // has not been computed yet.
459 bool guaranteed_monitor_matching() const { return access_flags().is_monitor_matching(); }
460 void set_guaranteed_monitor_matching() { _access_flags.set_monitor_matching(); }
462 // returns true if the method is an accessor function (setter/getter).
463 bool is_accessor() const;
465 // returns true if the method is an initializer (<init> or <clinit>).
466 bool is_initializer() const;
468 // compiled code support
469 // NOTE: code() is inherently racy as deopt can be clearing code
470 // simultaneously. Use with caution.
471 bool has_compiled_code() const { return code() != NULL; }
473 // sizing
474 static int object_size(bool is_native);
475 static int header_size() { return sizeof(methodOopDesc)/HeapWordSize; }
476 int object_size() const { return method_size(); }
478 bool object_is_parsable() const { return method_size() > 0; }
480 // interpreter support
481 static ByteSize const_offset() { return byte_offset_of(methodOopDesc, _constMethod ); }
482 static ByteSize constants_offset() { return byte_offset_of(methodOopDesc, _constants ); }
483 static ByteSize access_flags_offset() { return byte_offset_of(methodOopDesc, _access_flags ); }
484 #ifdef CC_INTERP
485 static ByteSize result_index_offset() { return byte_offset_of(methodOopDesc, _result_index ); }
486 #endif /* CC_INTERP */
487 static ByteSize size_of_locals_offset() { return byte_offset_of(methodOopDesc, _max_locals ); }
488 static ByteSize size_of_parameters_offset() { return byte_offset_of(methodOopDesc, _size_of_parameters); }
489 static ByteSize from_compiled_offset() { return byte_offset_of(methodOopDesc, _from_compiled_entry); }
490 static ByteSize code_offset() { return byte_offset_of(methodOopDesc, _code); }
491 static ByteSize invocation_counter_offset() { return byte_offset_of(methodOopDesc, _invocation_counter); }
492 static ByteSize backedge_counter_offset() { return byte_offset_of(methodOopDesc, _backedge_counter); }
493 static ByteSize method_data_offset() {
494 return byte_offset_of(methodOopDesc, _method_data);
495 }
496 static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); }
497 #ifndef PRODUCT
498 static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); }
499 #endif // not PRODUCT
500 static ByteSize native_function_offset() { return in_ByteSize(sizeof(methodOopDesc)); }
501 static ByteSize from_interpreted_offset() { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); }
502 static ByteSize interpreter_entry_offset() { return byte_offset_of(methodOopDesc, _i2i_entry ); }
503 static ByteSize signature_handler_offset() { return in_ByteSize(sizeof(methodOopDesc) + wordSize); }
504 static ByteSize max_stack_offset() { return byte_offset_of(methodOopDesc, _max_stack ); }
506 // for code generation
507 static int method_data_offset_in_bytes() { return offset_of(methodOopDesc, _method_data); }
508 static int interpreter_invocation_counter_offset_in_bytes()
509 { return offset_of(methodOopDesc, _interpreter_invocation_count); }
511 // Static methods that are used to implement member methods where an exposed this pointer
512 // is needed due to possible GCs
513 static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS);
515 // Returns the byte code index from the byte code pointer
516 int bci_from(address bcp) const;
517 address bcp_from(int bci) const;
518 int validate_bci_from_bcx(intptr_t bcx) const;
520 // Returns the line number for a bci if debugging information for the method is prowided,
521 // -1 is returned otherwise.
522 int line_number_from_bci(int bci) const;
524 // Reflection support
525 bool is_overridden_in(klassOop k) const;
527 // JSR 292 support
528 bool is_method_handle_invoke() const { return access_flags().is_method_handle_invoke(); }
529 static methodHandle make_invoke_method(KlassHandle holder,
530 symbolHandle signature,
531 Handle method_type,
532 TRAPS);
533 // these operate only on invoke methods:
534 oop method_handle_type() const;
535 static jint* method_type_offsets_chain(); // series of pointer-offsets, terminated by -1
536 // presize interpreter frames for extra interpreter stack entries, if needed
537 // method handles want to be able to push a few extra values (e.g., a bound receiver), and
538 // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
539 // all without checking for a stack overflow
540 static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); }
541 static int extra_stack_words(); // = extra_stack_entries() * Interpreter::stackElementSize()
542 // RedefineClasses() support:
543 bool is_old() const { return access_flags().is_old(); }
544 void set_is_old() { _access_flags.set_is_old(); }
545 bool is_obsolete() const { return access_flags().is_obsolete(); }
546 void set_is_obsolete() { _access_flags.set_is_obsolete(); }
547 // see the definition in methodOop.cpp for the gory details
548 bool should_not_be_cached() const;
550 // JVMTI Native method prefixing support:
551 bool is_prefixed_native() const { return access_flags().is_prefixed_native(); }
552 void set_is_prefixed_native() { _access_flags.set_is_prefixed_native(); }
554 // Rewriting support
555 static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
556 u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
558 // Get this method's jmethodID -- allocate if it doesn't exist
559 jmethodID jmethod_id() { methodHandle this_h(this);
560 return instanceKlass::jmethod_id_for_impl(method_holder(), this_h); }
562 // Lookup the jmethodID for this method. Return NULL if not found.
563 // NOTE that this function can be called from a signal handler
564 // (see AsyncGetCallTrace support for Forte Analyzer) and this
565 // needs to be async-safe. No allocation should be done and
566 // so handles are not used to avoid deadlock.
567 jmethodID find_jmethod_id_or_null() { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
569 // JNI static invoke cached itable index accessors
570 int cached_itable_index() { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
571 void set_cached_itable_index(int index) { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
573 // Support for inlining of intrinsic methods
574 vmIntrinsics::ID intrinsic_id() const { // returns zero if not an intrinsic
575 const u1& cache = _intrinsic_id_cache;
576 if (cache != 0) {
577 return (vmIntrinsics::ID)(cache - 1);
578 } else {
579 vmIntrinsics::ID id = compute_intrinsic_id();
580 *(u1*)&cache = ((u1) id) + 1; // force the cache to be non-const
581 vmIntrinsics::verify_method(id, (methodOop) this);
582 assert((vmIntrinsics::ID)(cache - 1) == id, "proper conversion");
583 return id;
584 }
585 }
587 // On-stack replacement support
588 bool has_osr_nmethod() { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci) != NULL; }
589 nmethod* lookup_osr_nmethod_for(int bci) { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci); }
591 // Inline cache support
592 void cleanup_inline_caches();
594 // Find if klass for method is loaded
595 bool is_klass_loaded_by_klass_index(int klass_index) const;
596 bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
598 // Indicates whether compilation failed earlier for this method, or
599 // whether it is not compilable for another reason like having a
600 // breakpoint set in it.
601 bool is_not_compilable(int comp_level = CompLevel_highest_tier) const;
602 void set_not_compilable(int comp_level = CompLevel_highest_tier);
604 bool is_not_osr_compilable() const { return is_not_compilable() || access_flags().is_not_osr_compilable(); }
605 void set_not_osr_compilable() { _access_flags.set_not_osr_compilable(); }
607 bool is_not_tier1_compilable() const { return access_flags().is_not_tier1_compilable(); }
608 void set_not_tier1_compilable() { _access_flags.set_not_tier1_compilable(); }
610 // Background compilation support
611 bool queued_for_compilation() const { return access_flags().queued_for_compilation(); }
612 void set_queued_for_compilation() { _access_flags.set_queued_for_compilation(); }
613 void clear_queued_for_compilation() { _access_flags.clear_queued_for_compilation(); }
615 static methodOop method_from_bcp(address bcp);
617 // Resolve all classes in signature, return 'true' if successful
618 static bool load_signature_classes(methodHandle m, TRAPS);
620 // Return if true if not all classes references in signature, including return type, has been loaded
621 static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
623 // Printing
624 void print_short_name(outputStream* st) /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
625 void print_name(outputStream* st) PRODUCT_RETURN; // prints as "virtual void foo(int)"
627 // Helper routine used for method sorting
628 static void sort_methods(objArrayOop methods,
629 objArrayOop methods_annotations,
630 objArrayOop methods_parameter_annotations,
631 objArrayOop methods_default_annotations,
632 bool idempotent = false);
634 // size of parameters
635 void set_size_of_parameters(int size) { _size_of_parameters = size; }
636 private:
638 // Helper routine for intrinsic_id().
639 vmIntrinsics::ID compute_intrinsic_id() const;
641 // Inlined elements
642 address* native_function_addr() const { assert(is_native(), "must be native"); return (address*) (this+1); }
643 address* signature_handler_addr() const { return native_function_addr() + 1; }
645 // Garbage collection support
646 oop* adr_constMethod() const { return (oop*)&_constMethod; }
647 oop* adr_constants() const { return (oop*)&_constants; }
648 oop* adr_method_data() const { return (oop*)&_method_data; }
649 };
652 // Utility class for compressing line number tables
654 class CompressedLineNumberWriteStream: public CompressedWriteStream {
655 private:
656 int _bci;
657 int _line;
658 public:
659 // Constructor
660 CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
661 CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
663 // Write (bci, line number) pair to stream
664 void write_pair_regular(int bci_delta, int line_delta);
666 inline void write_pair_inline(int bci, int line) {
667 int bci_delta = bci - _bci;
668 int line_delta = line - _line;
669 _bci = bci;
670 _line = line;
671 // Skip (0,0) deltas - they do not add information and conflict with terminator.
672 if (bci_delta == 0 && line_delta == 0) return;
673 // Check if bci is 5-bit and line number 3-bit unsigned.
674 if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
675 // Compress into single byte.
676 jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
677 // Check that value doesn't match escape character.
678 if (value != 0xFF) {
679 write_byte(value);
680 return;
681 }
682 }
683 write_pair_regular(bci_delta, line_delta);
684 }
686 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
687 // Disabling optimization doesn't work for methods in header files
688 // so we force it to call through the non-optimized version in the .cpp.
689 // It's gross, but it's the only way we can ensure that all callers are
690 // fixed. MSC_VER is defined in build/windows/makefiles/compile.make.
691 #if defined(_M_AMD64) && MSC_VER >= 1400
692 void write_pair(int bci, int line);
693 #else
694 void write_pair(int bci, int line) { write_pair_inline(bci, line); }
695 #endif
697 // Write end-of-stream marker
698 void write_terminator() { write_byte(0); }
699 };
702 // Utility class for decompressing line number tables
704 class CompressedLineNumberReadStream: public CompressedReadStream {
705 private:
706 int _bci;
707 int _line;
708 public:
709 // Constructor
710 CompressedLineNumberReadStream(u_char* buffer);
711 // Read (bci, line number) pair from stream. Returns false at end-of-stream.
712 bool read_pair();
713 // Accessing bci and line number (after calling read_pair)
714 int bci() const { return _bci; }
715 int line() const { return _line; }
716 };
719 /// Fast Breakpoints.
721 // If this structure gets more complicated (because bpts get numerous),
722 // move it into its own header.
724 // There is presently no provision for concurrent access
725 // to breakpoint lists, which is only OK for JVMTI because
726 // breakpoints are written only at safepoints, and are read
727 // concurrently only outside of safepoints.
729 class BreakpointInfo : public CHeapObj {
730 friend class VMStructs;
731 private:
732 Bytecodes::Code _orig_bytecode;
733 int _bci;
734 u2 _name_index; // of method
735 u2 _signature_index; // of method
736 BreakpointInfo* _next; // simple storage allocation
738 public:
739 BreakpointInfo(methodOop m, int bci);
741 // accessors
742 Bytecodes::Code orig_bytecode() { return _orig_bytecode; }
743 void set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
744 int bci() { return _bci; }
746 BreakpointInfo* next() const { return _next; }
747 void set_next(BreakpointInfo* n) { _next = n; }
749 // helps for searchers
750 bool match(methodOop m, int bci) {
751 return bci == _bci && match(m);
752 }
754 bool match(methodOop m) {
755 return _name_index == m->name_index() &&
756 _signature_index == m->signature_index();
757 }
759 void set(methodOop method);
760 void clear(methodOop method);
761 };