rev 1083 : code cache unloading for webrev 091214

   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  */
  24 
  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 // |------------------------------------------------------|
  81 
  82 
  83 class CheckedExceptionElement;
  84 class LocalVariableTableElement;
  85 class AdapterHandlerEntry;
  86 
  87 class methodDataOopDesc;
  88 
  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;               // vmSymbols::intrinsic_id (0 == _none)
 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   nmethod* volatile _saved_code;                 // remember nmethod while we attempt to clear code cache space
 130   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 131 
 132  public:
 133 
 134   static const bool IsUnsafeConc         = false;
 135   static const bool IsSafeConc           = true;
 136 
 137   // accessors for instance variables
 138   constMethodOop constMethod() const             { return _constMethod; }
 139   void set_constMethod(constMethodOop xconst)    { oop_store_without_check((oop*)&_constMethod, (oop)xconst); }
 140 
 141 
 142   static address make_adapters(methodHandle mh, TRAPS);
 143   volatile address from_compiled_entry() const   { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
 144   volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
 145 
 146   // access flag
 147   AccessFlags access_flags() const               { return _access_flags;  }
 148   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 149 
 150   // name
 151   symbolOop name() const                         { return _constants->symbol_at(name_index()); }
 152   int name_index() const                         { return constMethod()->name_index();         }
 153   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 154 
 155   // signature
 156   symbolOop signature() const                    { return _constants->symbol_at(signature_index()); }
 157   int signature_index() const                    { return constMethod()->signature_index();         }
 158   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 159 
 160   // generics support
 161   symbolOop generic_signature() const            { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); }
 162   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 163   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 164 
 165   // annotations support
 166   typeArrayOop annotations() const               { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); }
 167   typeArrayOop parameter_annotations() const     { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); }
 168   typeArrayOop annotation_default() const        { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); }
 169 
 170 #ifdef CC_INTERP
 171   void set_result_index(BasicType type);
 172   int  result_index()                            { return _result_index; }
 173 #endif
 174 
 175   // Helper routine: get klass name + "." + method name + signature as
 176   // C string, for the purpose of providing more useful NoSuchMethodErrors
 177   // and fatal error handling. The string is allocated in resource
 178   // area if a buffer is not provided by the caller.
 179   char* name_and_sig_as_C_string();
 180   char* name_and_sig_as_C_string(char* buf, int size);
 181 
 182   // Static routine in the situations we don't have a methodOop
 183   static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature);
 184   static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size);
 185 
 186   // JVMTI breakpoints
 187   Bytecodes::Code orig_bytecode_at(int bci);
 188   void        set_orig_bytecode_at(int bci, Bytecodes::Code code);
 189   void set_breakpoint(int bci);
 190   void clear_breakpoint(int bci);
 191   void clear_all_breakpoints();
 192   // Tracking number of breakpoints, for fullspeed debugging.
 193   // Only mutated by VM thread.
 194   u2   number_of_breakpoints() const             { return _number_of_breakpoints; }
 195   void incr_number_of_breakpoints()              { ++_number_of_breakpoints; }
 196   void decr_number_of_breakpoints()              { --_number_of_breakpoints; }
 197   // Initialization only
 198   void clear_number_of_breakpoints()             { _number_of_breakpoints = 0; }
 199 
 200   // index into instanceKlass methods() array
 201   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 202   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 203 
 204   // code size
 205   int code_size() const                  { return constMethod()->code_size(); }
 206 
 207   // method size
 208   int method_size() const                        { return _method_size; }
 209   void set_method_size(int size) {
 210     assert(0 <= size && size < (1 << 16), "invalid method size");
 211     _method_size = size;
 212   }
 213 
 214   // constant pool for klassOop holding this method
 215   constantPoolOop constants() const              { return _constants; }
 216   void set_constants(constantPoolOop c)          { oop_store_without_check((oop*)&_constants, c); }
 217 
 218   // max stack
 219   int  max_stack() const                         { return _max_stack; }
 220   void set_max_stack(int size)                   { _max_stack = size; }
 221 
 222   // max locals
 223   int  max_locals() const                        { return _max_locals; }
 224   void set_max_locals(int size)                  { _max_locals = size; }
 225   int highest_tier_compile()                     { return _highest_tier_compile;}
 226   void set_highest_tier_compile(int level)      { _highest_tier_compile = level;}
 227 
 228   // Count of times method was exited via exception while interpreting
 229   void interpreter_throwout_increment() {
 230     if (_interpreter_throwout_count < 65534) {
 231       _interpreter_throwout_count++;
 232     }
 233   }
 234 
 235   int  interpreter_throwout_count() const        { return _interpreter_throwout_count; }
 236   void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
 237 
 238   // size of parameters
 239   int  size_of_parameters() const                { return _size_of_parameters; }
 240 
 241   bool has_stackmap_table() const {
 242     return constMethod()->has_stackmap_table();
 243   }
 244 
 245   typeArrayOop stackmap_data() const {
 246     return constMethod()->stackmap_data();
 247   }
 248 
 249   // exception handler table
 250   typeArrayOop exception_table() const
 251                                    { return constMethod()->exception_table(); }
 252   void set_exception_table(typeArrayOop e)
 253                                      { constMethod()->set_exception_table(e); }
 254   bool has_exception_handler() const
 255                              { return constMethod()->has_exception_handler(); }
 256 
 257   // Finds the first entry point bci of an exception handler for an
 258   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 259   // for ex_klass indicates that the exception klass is not known; in
 260   // this case it matches any constraint class. Returns -1 if the
 261   // exception cannot be handled in this method. The handler
 262   // constraint classes are loaded if necessary. Note that this may
 263   // throw an exception if loading of the constraint classes causes
 264   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 265   // If an exception is thrown, returns the bci of the
 266   // exception handler which caused the exception to be thrown, which
 267   // is needed for proper retries. See, for example,
 268   // InterpreterRuntime::exception_handler_for_exception.
 269   int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
 270 
 271   // method data access
 272   methodDataOop method_data() const              {
 273     return _method_data;
 274   }
 275   void set_method_data(methodDataOop data)       {
 276     oop_store_without_check((oop*)&_method_data, (oop)data);
 277   }
 278 
 279   // invocation counter
 280   InvocationCounter* invocation_counter()        { return &_invocation_counter; }
 281   InvocationCounter* backedge_counter()          { return &_backedge_counter; }
 282   int invocation_count() const                   { return _invocation_counter.count(); }
 283   int backedge_count() const                     { return _backedge_counter.count(); }
 284   bool was_executed_more_than(int n) const;
 285   bool was_never_executed() const                { return !was_executed_more_than(0); }
 286 
 287   static void build_interpreter_method_data(methodHandle method, TRAPS);
 288 
 289   int interpreter_invocation_count() const       { return _interpreter_invocation_count; }
 290   void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
 291   int increment_interpreter_invocation_count() { return ++_interpreter_invocation_count; }
 292 
 293 #ifndef PRODUCT
 294   int  compiled_invocation_count() const         { return _compiled_invocation_count; }
 295   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 296 #endif // not PRODUCT
 297 
 298   // Clear (non-shared space) pointers which could not be relevant
 299   // if this (shared) method were mapped into another JVM.
 300   void remove_unshareable_info();
 301 
 302   // nmethod/verified compiler entry
 303   address verified_code_entry();
 304   bool check_code() const;      // Not inline to avoid circular ref
 305   nmethod* volatile code() const                 { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
 306   nmethod* saved_code() const                    { return _saved_code; }
 307   void set_saved_code(nmethod* code)             { _saved_code = code; }
 308   void clear_code();            // Clear out any compiled code
 309   void clear_code_hedge();      // Clear out any compiled code and save code ptr in attempt to clean up code cache
 310   void set_code(methodHandle mh, nmethod* code);
 311   void set_adapter_entry(AdapterHandlerEntry* adapter) {  _adapter = adapter; }
 312   address get_i2c_entry();
 313   address get_c2i_entry();
 314   address get_c2i_unverified_entry();
 315   AdapterHandlerEntry* adapter() {  return _adapter; }
 316   // setup entry points
 317   void link_method(methodHandle method, TRAPS);
 318   // clear entry points. Used by sharing code
 319   void unlink_method();
 320 
 321   // vtable index
 322   enum VtableIndexFlag {
 323     // Valid vtable indexes are non-negative (>= 0).
 324     // These few negative values are used as sentinels.
 325     highest_unused_vtable_index_value = -5,
 326     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 327     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 328     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 329     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 330   };
 331   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 332   int  vtable_index() const                      { assert(valid_vtable_index(), "");
 333                                                    return _vtable_index; }
 334   void set_vtable_index(int index)               { _vtable_index = index; }
 335 
 336   // interpreter entry
 337   address interpreter_entry() const              { return _i2i_entry; }
 338   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 339   void set_interpreter_entry(address entry)      { _i2i_entry = entry;  _from_interpreted_entry = entry; }
 340   int  interpreter_kind(void) {
 341      return constMethod()->interpreter_kind();
 342   }
 343   void set_interpreter_kind();
 344   void set_interpreter_kind(int kind) {
 345     constMethod()->set_interpreter_kind(kind);
 346   }
 347 
 348   // native function (used for native methods only)
 349   enum {
 350     native_bind_event_is_interesting = true
 351   };
 352   address native_function() const                { return *(native_function_addr()); }
 353   // Must specify a real function (not NULL).
 354   // Use clear_native_function() to unregister.
 355   void set_native_function(address function, bool post_event_flag);
 356   bool has_native_function() const;
 357   void clear_native_function();
 358 
 359   // signature handler (used for native methods only)
 360   address signature_handler() const              { return *(signature_handler_addr()); }
 361   void set_signature_handler(address handler);
 362 
 363   // Interpreter oopmap support
 364   void mask_for(int bci, InterpreterOopMap* mask);
 365 
 366 #ifndef PRODUCT
 367   // operations on invocation counter
 368   void print_invocation_count() const;
 369 #endif
 370 
 371   // byte codes
 372   address code_base() const           { return constMethod()->code_base(); }
 373   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 374 
 375   // prints byte codes
 376   void print_codes() const            { print_codes_on(tty); }
 377   void print_codes_on(outputStream* st) const                      PRODUCT_RETURN;
 378   void print_codes_on(int from, int to, outputStream* st) const    PRODUCT_RETURN;
 379 
 380   // checked exceptions
 381   int checked_exceptions_length() const
 382                          { return constMethod()->checked_exceptions_length(); }
 383   CheckedExceptionElement* checked_exceptions_start() const
 384                           { return constMethod()->checked_exceptions_start(); }
 385 
 386   // localvariable table
 387   bool has_localvariable_table() const
 388                           { return constMethod()->has_localvariable_table(); }
 389   int localvariable_table_length() const
 390                         { return constMethod()->localvariable_table_length(); }
 391   LocalVariableTableElement* localvariable_table_start() const
 392                          { return constMethod()->localvariable_table_start(); }
 393 
 394   bool has_linenumber_table() const
 395                               { return constMethod()->has_linenumber_table(); }
 396   u_char* compressed_linenumber_table() const
 397                        { return constMethod()->compressed_linenumber_table(); }
 398 
 399   // method holder (the klassOop holding this method)
 400   klassOop method_holder() const                 { return _constants->pool_holder(); }
 401 
 402   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 403   symbolOop klass_name() const;                  // returns the name of the method holder
 404   BasicType result_type() const;                 // type of the method result
 405   int result_type_index() const;                 // type index of the method result
 406   bool is_returning_oop() const                  { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
 407   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
 408 
 409   // Checked exceptions thrown by this method (resolved to mirrors)
 410   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 411 
 412   // Access flags
 413   bool is_public() const                         { return access_flags().is_public();      }
 414   bool is_private() const                        { return access_flags().is_private();     }
 415   bool is_protected() const                      { return access_flags().is_protected();   }
 416   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 417   bool is_static() const                         { return access_flags().is_static();      }
 418   bool is_final() const                          { return access_flags().is_final();       }
 419   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 420   bool is_native() const                         { return access_flags().is_native();      }
 421   bool is_abstract() const                       { return access_flags().is_abstract();    }
 422   bool is_strict() const                         { return access_flags().is_strict();      }
 423   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 424 
 425   // returns true if contains only return operation
 426   bool is_empty_method() const;
 427 
 428   // returns true if this is a vanilla constructor
 429   bool is_vanilla_constructor() const;
 430 
 431   // checks method and its method holder
 432   bool is_final_method() const;
 433   bool is_strict_method() const;
 434 
 435   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 436   bool can_be_statically_bound() const;
 437 
 438   // returns true if the method has any backward branches.
 439   bool has_loops() {
 440     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 441   };
 442 
 443   bool compute_has_loops_flag();
 444 
 445   bool has_jsrs() {
 446     return access_flags().has_jsrs();
 447   };
 448   void set_has_jsrs() {
 449     _access_flags.set_has_jsrs();
 450   }
 451 
 452   // returns true if the method has any monitors.
 453   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 454   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 455 
 456   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 457 
 458   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 459   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 460   // has not been computed yet.
 461   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 462   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 463 
 464   // returns true if the method is an accessor function (setter/getter).
 465   bool is_accessor() const;
 466 
 467   // returns true if the method is an initializer (<init> or <clinit>).
 468   bool is_initializer() const;
 469 
 470   // compiled code support
 471   // NOTE: code() is inherently racy as deopt can be clearing code
 472   // simultaneously. Use with caution.
 473   bool has_compiled_code() const                 { return code() != NULL; }
 474 
 475   // sizing
 476   static int object_size(bool is_native);
 477   static int header_size()                       { return sizeof(methodOopDesc)/HeapWordSize; }
 478   int object_size() const                        { return method_size(); }
 479 
 480   bool object_is_parsable() const                { return method_size() > 0; }
 481 
 482   // interpreter support
 483   static ByteSize const_offset()                 { return byte_offset_of(methodOopDesc, _constMethod       ); }
 484   static ByteSize constants_offset()             { return byte_offset_of(methodOopDesc, _constants         ); }
 485   static ByteSize access_flags_offset()          { return byte_offset_of(methodOopDesc, _access_flags      ); }
 486 #ifdef CC_INTERP
 487   static ByteSize result_index_offset()          { return byte_offset_of(methodOopDesc, _result_index ); }
 488 #endif /* CC_INTERP */
 489   static ByteSize size_of_locals_offset()        { return byte_offset_of(methodOopDesc, _max_locals        ); }
 490   static ByteSize size_of_parameters_offset()    { return byte_offset_of(methodOopDesc, _size_of_parameters); }
 491   static ByteSize from_compiled_offset()         { return byte_offset_of(methodOopDesc, _from_compiled_entry); }
 492   static ByteSize code_offset()                  { return byte_offset_of(methodOopDesc, _code); }
 493   static ByteSize invocation_counter_offset()    { return byte_offset_of(methodOopDesc, _invocation_counter); }
 494   static ByteSize backedge_counter_offset()      { return byte_offset_of(methodOopDesc, _backedge_counter); }
 495   static ByteSize method_data_offset()           {
 496     return byte_offset_of(methodOopDesc, _method_data);
 497   }
 498   static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); }
 499 #ifndef PRODUCT
 500   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); }
 501 #endif // not PRODUCT
 502   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(methodOopDesc));                 }
 503   static ByteSize from_interpreted_offset()      { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); }
 504   static ByteSize interpreter_entry_offset()     { return byte_offset_of(methodOopDesc, _i2i_entry ); }
 505   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(methodOopDesc) + wordSize);      }
 506   static ByteSize max_stack_offset()             { return byte_offset_of(methodOopDesc, _max_stack         ); }
 507 
 508   // for code generation
 509   static int method_data_offset_in_bytes()       { return offset_of(methodOopDesc, _method_data); }
 510   static int interpreter_invocation_counter_offset_in_bytes()
 511                                                  { return offset_of(methodOopDesc, _interpreter_invocation_count); }
 512 
 513   // Static methods that are used to implement member methods where an exposed this pointer
 514   // is needed due to possible GCs
 515   static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS);
 516 
 517   // Returns the byte code index from the byte code pointer
 518   int     bci_from(address bcp) const;
 519   address bcp_from(int     bci) const;
 520   int validate_bci_from_bcx(intptr_t bcx) const;
 521 
 522   // Returns the line number for a bci if debugging information for the method is prowided,
 523   // -1 is returned otherwise.
 524   int line_number_from_bci(int bci) const;
 525 
 526   // Reflection support
 527   bool is_overridden_in(klassOop k) const;
 528 
 529   // JSR 292 support
 530   bool is_method_handle_invoke() const              { return access_flags().is_method_handle_invoke(); }
 531   static methodHandle make_invoke_method(KlassHandle holder,
 532                                          symbolHandle signature,
 533                                          Handle method_type,
 534                                          TRAPS);
 535   // these operate only on invoke methods:
 536   oop method_handle_type() const;
 537   static jint* method_type_offsets_chain();  // series of pointer-offsets, terminated by -1
 538   // presize interpreter frames for extra interpreter stack entries, if needed
 539   // method handles want to be able to push a few extra values (e.g., a bound receiver), and
 540   // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
 541   // all without checking for a stack overflow
 542   static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); }
 543   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize()
 544   // RedefineClasses() support:
 545   bool is_old() const                               { return access_flags().is_old(); }
 546   void set_is_old()                                 { _access_flags.set_is_old(); }
 547   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 548   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 549   // see the definition in methodOop.cpp for the gory details
 550   bool should_not_be_cached() const;
 551 
 552   // JVMTI Native method prefixing support:
 553   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 554   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 555 
 556   // Rewriting support
 557   static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
 558                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 559 
 560   // Get this method's jmethodID -- allocate if it doesn't exist
 561   jmethodID jmethod_id()                            { methodHandle this_h(this);
 562                                                       return instanceKlass::get_jmethod_id(method_holder(), this_h); }
 563 
 564   // Lookup the jmethodID for this method.  Return NULL if not found.
 565   // NOTE that this function can be called from a signal handler
 566   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 567   // needs to be async-safe. No allocation should be done and
 568   // so handles are not used to avoid deadlock.
 569   jmethodID find_jmethod_id_or_null()               { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
 570 
 571   // JNI static invoke cached itable index accessors
 572   int cached_itable_index()                         { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
 573   void set_cached_itable_index(int index)           { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
 574 
 575   // Support for inlining of intrinsic methods
 576   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 577   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u1) id; }
 578 
 579   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 580   void init_intrinsic_id();     // updates from _none if a match
 581   static vmSymbols::SID klass_id_for_intrinsics(klassOop holder);
 582 
 583   // On-stack replacement support
 584   bool has_osr_nmethod()                         { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci) != NULL; }
 585   nmethod* lookup_osr_nmethod_for(int bci)       { return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci); }
 586 
 587   // Inline cache support
 588   void cleanup_inline_caches();
 589 
 590   // Find if klass for method is loaded
 591   bool is_klass_loaded_by_klass_index(int klass_index) const;
 592   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 593 
 594   // Indicates whether compilation failed earlier for this method, or
 595   // whether it is not compilable for another reason like having a
 596   // breakpoint set in it.
 597   bool is_not_compilable(int comp_level = CompLevel_highest_tier) const;
 598   void set_not_compilable(int comp_level = CompLevel_highest_tier);
 599 
 600   bool is_not_osr_compilable() const             { return is_not_compilable() || access_flags().is_not_osr_compilable(); }
 601   void set_not_osr_compilable()                  { _access_flags.set_not_osr_compilable(); }
 602 
 603   bool is_not_tier1_compilable() const           { return access_flags().is_not_tier1_compilable(); }
 604   void set_not_tier1_compilable()                { _access_flags.set_not_tier1_compilable(); }
 605 
 606   // Background compilation support
 607   bool queued_for_compilation() const            { return access_flags().queued_for_compilation();    }
 608   void set_queued_for_compilation()              { _access_flags.set_queued_for_compilation(); }
 609   void clear_queued_for_compilation()            { _access_flags.clear_queued_for_compilation(); }
 610 
 611   static methodOop method_from_bcp(address bcp);
 612 
 613   // Resolve all classes in signature, return 'true' if successful
 614   static bool load_signature_classes(methodHandle m, TRAPS);
 615 
 616   // Return if true if not all classes references in signature, including return type, has been loaded
 617   static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
 618 
 619   // Printing
 620   void print_short_name(outputStream* st)        /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
 621   void print_name(outputStream* st)              PRODUCT_RETURN; // prints as "virtual void foo(int)"
 622 
 623   // Helper routine used for method sorting
 624   static void sort_methods(objArrayOop methods,
 625                            objArrayOop methods_annotations,
 626                            objArrayOop methods_parameter_annotations,
 627                            objArrayOop methods_default_annotations,
 628                            bool idempotent = false);
 629 
 630   // size of parameters
 631   void set_size_of_parameters(int size)          { _size_of_parameters = size; }
 632  private:
 633 
 634   // Inlined elements
 635   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
 636   address* signature_handler_addr() const        { return native_function_addr() + 1; }
 637 
 638   // Garbage collection support
 639   oop*  adr_constMethod() const                  { return (oop*)&_constMethod;     }
 640   oop*  adr_constants() const                    { return (oop*)&_constants;       }
 641   oop*  adr_method_data() const                  { return (oop*)&_method_data;     }
 642 };
 643 
 644 
 645 // Utility class for compressing line number tables
 646 
 647 class CompressedLineNumberWriteStream: public CompressedWriteStream {
 648  private:
 649   int _bci;
 650   int _line;
 651  public:
 652   // Constructor
 653   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
 654   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
 655 
 656   // Write (bci, line number) pair to stream
 657   void write_pair_regular(int bci_delta, int line_delta);
 658 
 659   inline void write_pair_inline(int bci, int line) {
 660     int bci_delta = bci - _bci;
 661     int line_delta = line - _line;
 662     _bci = bci;
 663     _line = line;
 664     // Skip (0,0) deltas - they do not add information and conflict with terminator.
 665     if (bci_delta == 0 && line_delta == 0) return;
 666     // Check if bci is 5-bit and line number 3-bit unsigned.
 667     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
 668       // Compress into single byte.
 669       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
 670       // Check that value doesn't match escape character.
 671       if (value != 0xFF) {
 672         write_byte(value);
 673         return;
 674       }
 675     }
 676     write_pair_regular(bci_delta, line_delta);
 677   }
 678 
 679 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
 680 // Disabling optimization doesn't work for methods in header files
 681 // so we force it to call through the non-optimized version in the .cpp.
 682 // It's gross, but it's the only way we can ensure that all callers are
 683 // fixed.  MSC_VER is defined in build/windows/makefiles/compile.make.
 684 #if defined(_M_AMD64) && MSC_VER >= 1400
 685   void write_pair(int bci, int line);
 686 #else
 687   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
 688 #endif
 689 
 690   // Write end-of-stream marker
 691   void write_terminator()                        { write_byte(0); }
 692 };
 693 
 694 
 695 // Utility class for decompressing line number tables
 696 
 697 class CompressedLineNumberReadStream: public CompressedReadStream {
 698  private:
 699   int _bci;
 700   int _line;
 701  public:
 702   // Constructor
 703   CompressedLineNumberReadStream(u_char* buffer);
 704   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
 705   bool read_pair();
 706   // Accessing bci and line number (after calling read_pair)
 707   int bci() const                               { return _bci; }
 708   int line() const                              { return _line; }
 709 };
 710 
 711 
 712 /// Fast Breakpoints.
 713 
 714 // If this structure gets more complicated (because bpts get numerous),
 715 // move it into its own header.
 716 
 717 // There is presently no provision for concurrent access
 718 // to breakpoint lists, which is only OK for JVMTI because
 719 // breakpoints are written only at safepoints, and are read
 720 // concurrently only outside of safepoints.
 721 
 722 class BreakpointInfo : public CHeapObj {
 723   friend class VMStructs;
 724  private:
 725   Bytecodes::Code  _orig_bytecode;
 726   int              _bci;
 727   u2               _name_index;       // of method
 728   u2               _signature_index;  // of method
 729   BreakpointInfo*  _next;             // simple storage allocation
 730 
 731  public:
 732   BreakpointInfo(methodOop m, int bci);
 733 
 734   // accessors
 735   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
 736   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
 737   int         bci()                                   { return _bci; }
 738 
 739   BreakpointInfo*          next() const               { return _next; }
 740   void                 set_next(BreakpointInfo* n)    { _next = n; }
 741 
 742   // helps for searchers
 743   bool match(methodOop m, int bci) {
 744     return bci == _bci && match(m);
 745   }
 746 
 747   bool match(methodOop m) {
 748     return _name_index == m->name_index() &&
 749       _signature_index == m->signature_index();
 750   }
 751 
 752   void set(methodOop method);
 753   void clear(methodOop method);
 754 };
--- EOF ---