1 /*
   2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_OOPS_METHODOOP_HPP
  26 #define SHARE_VM_OOPS_METHODOOP_HPP
  27 
  28 #include "classfile/vmSymbols.hpp"
  29 #include "code/compressedStream.hpp"
  30 #include "compiler/oopMap.hpp"
  31 #include "interpreter/invocationCounter.hpp"
  32 #include "oops/constMethodOop.hpp"
  33 #include "oops/constantPoolOop.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"
  39 
  40 // A methodOop 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 methodOopDesc 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 // | constMethodOop                 (oop)                 |
  67 // | constants                      (oop)                 |
  68 // |------------------------------------------------------|
  69 // | methodData                     (oop)                 |
  70 // | interp_invocation_count                              |
  71 // |------------------------------------------------------|
  72 // | access_flags                                         |
  73 // | vtable_index                                         |
  74 // |------------------------------------------------------|
  75 // | result_index (C++ interpreter only)                  |
  76 // |------------------------------------------------------|
  77 // | method_size             | max_stack                  |
  78 // | max_locals              | size_of_parameters         |
  79 // |------------------------------------------------------|
  80 // | intrinsic_id, (unused)  |  throwout_count            |
  81 // |------------------------------------------------------|
  82 // | num_breakpoints         |  (unused)                  |
  83 // |------------------------------------------------------|
  84 // | invocation_counter                                   |
  85 // | backedge_counter                                     |
  86 // |------------------------------------------------------|
  87 // | code                           (pointer)             |
  88 // | i2i                            (pointer)             |
  89 // | adapter                        (pointer)             |
  90 // | from_compiled_entry            (pointer)             |
  91 // | from_interpreted_entry         (pointer)             |
  92 // |------------------------------------------------------|
  93 // | native_function       (present only if native)       |
  94 // | signature_handler     (present only if native)       |
  95 // |------------------------------------------------------|
  96 
  97 
  98 class CheckedExceptionElement;
  99 class LocalVariableTableElement;
 100 class AdapterHandlerEntry;
 101 class methodDataOopDesc;
 102 
 103 class methodOopDesc : public oopDesc {
 104  friend class methodKlass;
 105  friend class VMStructs;
 106  private:
 107   constMethodOop    _constMethod;                // Method read-only data.
 108   constantPoolOop   _constants;                  // Constant pool
 109   methodDataOop     _method_data;
 110   int               _interpreter_invocation_count; // Count of times invoked (reused as prev_event_count in tiered)
 111   AccessFlags       _access_flags;               // Access flags
 112   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
 113                                                  // note: can have vtables with >2**16 elements (because of inheritance)
 114 #ifdef CC_INTERP
 115   int               _result_index;               // C++ interpreter needs for converting results to/from stack
 116 #endif
 117   u2                _method_size;                // size of this object
 118   u2                _max_stack;                  // Maximum number of entries on the expression stack
 119   u2                _max_locals;                 // Number of local variables used by this method
 120   u2                _size_of_parameters;         // size of the parameter block (receiver + arguments) in words
 121   u1                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
 122   u2                _interpreter_throwout_count; // Count of times method was exited via exception while interpreting
 123   u2                _number_of_breakpoints;      // fullspeed debugging support
 124   InvocationCounter _invocation_counter;         // Incremented before each activation of the method - used to trigger frequency-based optimizations
 125   InvocationCounter _backedge_counter;           // Incremented before each backedge taken - used to trigger frequencey-based optimizations
 126 
 127 #ifndef PRODUCT
 128   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
 129 #endif
 130   // Entry point for calling both from and to the interpreter.
 131   address _i2i_entry;           // All-args-on-stack calling convention
 132   // Adapter blob (i2c/c2i) for this methodOop. Set once when method is linked.
 133   AdapterHandlerEntry* _adapter;
 134   // Entry point for calling from compiled code, to compiled code if it exists
 135   // or else the interpreter.
 136   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
 137   // The entry point for calling both from and to compiled code is
 138   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
 139   // field can come and go.  It can transition from NULL to not-null at any
 140   // time (whenever a compile completes).  It can transition from not-null to
 141   // NULL only at safepoints (because of a de-opt).
 142   nmethod* volatile _code;                       // Points to the corresponding piece of native code
 143   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
 144 
 145  public:
 146 
 147   static const bool IsUnsafeConc         = false;
 148   static const bool IsSafeConc           = true;
 149 
 150   // accessors for instance variables
 151   constMethodOop constMethod() const             { return _constMethod; }
 152   void set_constMethod(constMethodOop xconst)    { oop_store_without_check((oop*)&_constMethod, (oop)xconst); }
 153 
 154 
 155   static address make_adapters(methodHandle mh, TRAPS);
 156   volatile address from_compiled_entry() const   { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
 157   volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
 158 
 159   // access flag
 160   AccessFlags access_flags() const               { return _access_flags;  }
 161   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 162 
 163   // name
 164   symbolOop name() const                         { return _constants->symbol_at(name_index()); }
 165   int name_index() const                         { return constMethod()->name_index();         }
 166   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 167 
 168   // signature
 169   symbolOop signature() const                    { return _constants->symbol_at(signature_index()); }
 170   int signature_index() const                    { return constMethod()->signature_index();         }
 171   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 172 
 173   // generics support
 174   symbolOop generic_signature() const            { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (symbolOop)NULL); }
 175   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 176   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 177 
 178   // annotations support
 179   typeArrayOop annotations() const               { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); }
 180   typeArrayOop parameter_annotations() const     { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); }
 181   typeArrayOop annotation_default() const        { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); }
 182 
 183 #ifdef CC_INTERP
 184   void set_result_index(BasicType type);
 185   int  result_index()                            { return _result_index; }
 186 #endif
 187 
 188   // Helper routine: get klass name + "." + method name + signature as
 189   // C string, for the purpose of providing more useful NoSuchMethodErrors
 190   // and fatal error handling. The string is allocated in resource
 191   // area if a buffer is not provided by the caller.
 192   char* name_and_sig_as_C_string();
 193   char* name_and_sig_as_C_string(char* buf, int size);
 194 
 195   // Static routine in the situations we don't have a methodOop
 196   static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature);
 197   static char* name_and_sig_as_C_string(Klass* klass, symbolOop method_name, symbolOop signature, char* buf, int size);
 198 
 199   // JVMTI breakpoints
 200   Bytecodes::Code orig_bytecode_at(int bci);
 201   void        set_orig_bytecode_at(int bci, Bytecodes::Code code);
 202   void set_breakpoint(int bci);
 203   void clear_breakpoint(int bci);
 204   void clear_all_breakpoints();
 205   // Tracking number of breakpoints, for fullspeed debugging.
 206   // Only mutated by VM thread.
 207   u2   number_of_breakpoints() const             { return _number_of_breakpoints; }
 208   void incr_number_of_breakpoints()              { ++_number_of_breakpoints; }
 209   void decr_number_of_breakpoints()              { --_number_of_breakpoints; }
 210   // Initialization only
 211   void clear_number_of_breakpoints()             { _number_of_breakpoints = 0; }
 212 
 213   // index into instanceKlass methods() array
 214   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 215   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 216 
 217   // code size
 218   int code_size() const                  { return constMethod()->code_size(); }
 219 
 220   // method size
 221   int method_size() const                        { return _method_size; }
 222   void set_method_size(int size) {
 223     assert(0 <= size && size < (1 << 16), "invalid method size");
 224     _method_size = size;
 225   }
 226 
 227   // constant pool for klassOop holding this method
 228   constantPoolOop constants() const              { return _constants; }
 229   void set_constants(constantPoolOop c)          { oop_store_without_check((oop*)&_constants, c); }
 230 
 231   // max stack
 232   int  max_stack() const                         { return _max_stack; }
 233   void set_max_stack(int size)                   { _max_stack = size; }
 234 
 235   // max locals
 236   int  max_locals() const                        { return _max_locals; }
 237   void set_max_locals(int size)                  { _max_locals = size; }
 238 
 239   int highest_comp_level() const;
 240   void set_highest_comp_level(int level);
 241   int highest_osr_comp_level() const;
 242   void set_highest_osr_comp_level(int level);
 243 
 244   // Count of times method was exited via exception while interpreting
 245   void interpreter_throwout_increment() {
 246     if (_interpreter_throwout_count < 65534) {
 247       _interpreter_throwout_count++;
 248     }
 249   }
 250 
 251   int  interpreter_throwout_count() const        { return _interpreter_throwout_count; }
 252   void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
 253 
 254   // size of parameters
 255   int  size_of_parameters() const                { return _size_of_parameters; }
 256 
 257   bool has_stackmap_table() const {
 258     return constMethod()->has_stackmap_table();
 259   }
 260 
 261   typeArrayOop stackmap_data() const {
 262     return constMethod()->stackmap_data();
 263   }
 264 
 265   void set_stackmap_data(typeArrayOop sd) {
 266     constMethod()->set_stackmap_data(sd);
 267   }
 268 
 269   // exception handler table
 270   typeArrayOop exception_table() const
 271                                    { return constMethod()->exception_table(); }
 272   void set_exception_table(typeArrayOop e)
 273                                      { constMethod()->set_exception_table(e); }
 274   bool has_exception_handler() const
 275                              { return constMethod()->has_exception_handler(); }
 276 
 277   // Finds the first entry point bci of an exception handler for an
 278   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 279   // for ex_klass indicates that the exception klass is not known; in
 280   // this case it matches any constraint class. Returns -1 if the
 281   // exception cannot be handled in this method. The handler
 282   // constraint classes are loaded if necessary. Note that this may
 283   // throw an exception if loading of the constraint classes causes
 284   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 285   // If an exception is thrown, returns the bci of the
 286   // exception handler which caused the exception to be thrown, which
 287   // is needed for proper retries. See, for example,
 288   // InterpreterRuntime::exception_handler_for_exception.
 289   int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
 290 
 291   // method data access
 292   methodDataOop method_data() const              {
 293     return _method_data;
 294   }
 295   void set_method_data(methodDataOop data)       {
 296     oop_store_without_check((oop*)&_method_data, (oop)data);
 297   }
 298 
 299   // invocation counter
 300   InvocationCounter* invocation_counter() { return &_invocation_counter; }
 301   InvocationCounter* backedge_counter()   { return &_backedge_counter; }
 302 
 303   int invocation_count();
 304   int backedge_count();
 305 
 306   bool was_executed_more_than(int n);
 307   bool was_never_executed()                      { return !was_executed_more_than(0); }
 308 
 309   static void build_interpreter_method_data(methodHandle method, TRAPS);
 310 
 311   int interpreter_invocation_count() {
 312     if (TieredCompilation) return invocation_count();
 313     else return _interpreter_invocation_count;
 314   }
 315   void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
 316   int increment_interpreter_invocation_count() {
 317     if (TieredCompilation) ShouldNotReachHere();
 318     return ++_interpreter_invocation_count;
 319   }
 320 
 321 #ifndef PRODUCT
 322   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 323   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 324 #endif // not PRODUCT
 325 
 326   // Clear (non-shared space) pointers which could not be relevant
 327   // if this (shared) method were mapped into another JVM.
 328   void remove_unshareable_info();
 329 
 330   // nmethod/verified compiler entry
 331   address verified_code_entry();
 332   bool check_code() const;      // Not inline to avoid circular ref
 333   nmethod* volatile code() const                 { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
 334   void clear_code();            // Clear out any compiled code
 335   static void set_code(methodHandle mh, nmethod* code);
 336   void set_adapter_entry(AdapterHandlerEntry* adapter) {  _adapter = adapter; }
 337   address get_i2c_entry();
 338   address get_c2i_entry();
 339   address get_c2i_unverified_entry();
 340   AdapterHandlerEntry* adapter() {  return _adapter; }
 341   // setup entry points
 342   void link_method(methodHandle method, TRAPS);
 343   // clear entry points. Used by sharing code
 344   void unlink_method();
 345 
 346   // vtable index
 347   enum VtableIndexFlag {
 348     // Valid vtable indexes are non-negative (>= 0).
 349     // These few negative values are used as sentinels.
 350     highest_unused_vtable_index_value = -5,
 351     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 352     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 353     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 354     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 355   };
 356   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 357   int  vtable_index() const                      { assert(valid_vtable_index(), "");
 358                                                    return _vtable_index; }
 359   void set_vtable_index(int index)               { _vtable_index = index; }
 360 
 361   // interpreter entry
 362   address interpreter_entry() const              { return _i2i_entry; }
 363   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 364   void set_interpreter_entry(address entry)      { _i2i_entry = entry;  _from_interpreted_entry = entry; }
 365   int  interpreter_kind(void) {
 366      return constMethod()->interpreter_kind();
 367   }
 368   void set_interpreter_kind();
 369   void set_interpreter_kind(int kind) {
 370     constMethod()->set_interpreter_kind(kind);
 371   }
 372 
 373   // native function (used for native methods only)
 374   enum {
 375     native_bind_event_is_interesting = true
 376   };
 377   address native_function() const                { return *(native_function_addr()); }
 378   // Must specify a real function (not NULL).
 379   // Use clear_native_function() to unregister.
 380   void set_native_function(address function, bool post_event_flag);
 381   bool has_native_function() const;
 382   void clear_native_function();
 383 
 384   // signature handler (used for native methods only)
 385   address signature_handler() const              { return *(signature_handler_addr()); }
 386   void set_signature_handler(address handler);
 387 
 388   // Interpreter oopmap support
 389   void mask_for(int bci, InterpreterOopMap* mask);
 390 
 391 #ifndef PRODUCT
 392   // operations on invocation counter
 393   void print_invocation_count();
 394 #endif
 395 
 396   // byte codes
 397   void    set_code(address code)      { return constMethod()->set_code(code); }
 398   address code_base() const           { return constMethod()->code_base(); }
 399   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 400 
 401   // prints byte codes
 402   void print_codes() const            { print_codes_on(tty); }
 403   void print_codes_on(outputStream* st) const                      PRODUCT_RETURN;
 404   void print_codes_on(int from, int to, outputStream* st) const    PRODUCT_RETURN;
 405 
 406   // checked exceptions
 407   int checked_exceptions_length() const
 408                          { return constMethod()->checked_exceptions_length(); }
 409   CheckedExceptionElement* checked_exceptions_start() const
 410                           { return constMethod()->checked_exceptions_start(); }
 411 
 412   // localvariable table
 413   bool has_localvariable_table() const
 414                           { return constMethod()->has_localvariable_table(); }
 415   int localvariable_table_length() const
 416                         { return constMethod()->localvariable_table_length(); }
 417   LocalVariableTableElement* localvariable_table_start() const
 418                          { return constMethod()->localvariable_table_start(); }
 419 
 420   bool has_linenumber_table() const
 421                               { return constMethod()->has_linenumber_table(); }
 422   u_char* compressed_linenumber_table() const
 423                        { return constMethod()->compressed_linenumber_table(); }
 424 
 425   // method holder (the klassOop holding this method)
 426   klassOop method_holder() const                 { return _constants->pool_holder(); }
 427 
 428   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 429   symbolOop klass_name() const;                  // returns the name of the method holder
 430   BasicType result_type() const;                 // type of the method result
 431   int result_type_index() const;                 // type index of the method result
 432   bool is_returning_oop() const                  { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
 433   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
 434 
 435   // Checked exceptions thrown by this method (resolved to mirrors)
 436   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 437 
 438   // Access flags
 439   bool is_public() const                         { return access_flags().is_public();      }
 440   bool is_private() const                        { return access_flags().is_private();     }
 441   bool is_protected() const                      { return access_flags().is_protected();   }
 442   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 443   bool is_static() const                         { return access_flags().is_static();      }
 444   bool is_final() const                          { return access_flags().is_final();       }
 445   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 446   bool is_native() const                         { return access_flags().is_native();      }
 447   bool is_abstract() const                       { return access_flags().is_abstract();    }
 448   bool is_strict() const                         { return access_flags().is_strict();      }
 449   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 450 
 451   // returns true if contains only return operation
 452   bool is_empty_method() const;
 453 
 454   // returns true if this is a vanilla constructor
 455   bool is_vanilla_constructor() const;
 456 
 457   // checks method and its method holder
 458   bool is_final_method() const;
 459   bool is_strict_method() const;
 460 
 461   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 462   bool can_be_statically_bound() const;
 463 
 464   // returns true if the method has any backward branches.
 465   bool has_loops() {
 466     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 467   };
 468 
 469   bool compute_has_loops_flag();
 470 
 471   bool has_jsrs() {
 472     return access_flags().has_jsrs();
 473   };
 474   void set_has_jsrs() {
 475     _access_flags.set_has_jsrs();
 476   }
 477 
 478   // returns true if the method has any monitors.
 479   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 480   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 481 
 482   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 483 
 484   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 485   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 486   // has not been computed yet.
 487   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 488   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 489 
 490   // returns true if the method is an accessor function (setter/getter).
 491   bool is_accessor() const;
 492 
 493   // returns true if the method is an initializer (<init> or <clinit>).
 494   bool is_initializer() const;
 495 
 496   // compiled code support
 497   // NOTE: code() is inherently racy as deopt can be clearing code
 498   // simultaneously. Use with caution.
 499   bool has_compiled_code() const                 { return code() != NULL; }
 500 
 501   // sizing
 502   static int object_size(bool is_native);
 503   static int header_size()                       { return sizeof(methodOopDesc)/HeapWordSize; }
 504   int object_size() const                        { return method_size(); }
 505 
 506   bool object_is_parsable() const                { return method_size() > 0; }
 507 
 508   // interpreter support
 509   static ByteSize const_offset()                 { return byte_offset_of(methodOopDesc, _constMethod       ); }
 510   static ByteSize constants_offset()             { return byte_offset_of(methodOopDesc, _constants         ); }
 511   static ByteSize access_flags_offset()          { return byte_offset_of(methodOopDesc, _access_flags      ); }
 512 #ifdef CC_INTERP
 513   static ByteSize result_index_offset()          { return byte_offset_of(methodOopDesc, _result_index ); }
 514 #endif /* CC_INTERP */
 515   static ByteSize size_of_locals_offset()        { return byte_offset_of(methodOopDesc, _max_locals        ); }
 516   static ByteSize size_of_parameters_offset()    { return byte_offset_of(methodOopDesc, _size_of_parameters); }
 517   static ByteSize from_compiled_offset()         { return byte_offset_of(methodOopDesc, _from_compiled_entry); }
 518   static ByteSize code_offset()                  { return byte_offset_of(methodOopDesc, _code); }
 519   static ByteSize invocation_counter_offset()    { return byte_offset_of(methodOopDesc, _invocation_counter); }
 520   static ByteSize backedge_counter_offset()      { return byte_offset_of(methodOopDesc, _backedge_counter); }
 521   static ByteSize method_data_offset()           {
 522     return byte_offset_of(methodOopDesc, _method_data);
 523   }
 524   static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); }
 525 #ifndef PRODUCT
 526   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); }
 527 #endif // not PRODUCT
 528   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(methodOopDesc));                 }
 529   static ByteSize from_interpreted_offset()      { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); }
 530   static ByteSize interpreter_entry_offset()     { return byte_offset_of(methodOopDesc, _i2i_entry ); }
 531   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(methodOopDesc) + wordSize);      }
 532   static ByteSize max_stack_offset()             { return byte_offset_of(methodOopDesc, _max_stack         ); }
 533 
 534   // for code generation
 535   static int method_data_offset_in_bytes()       { return offset_of(methodOopDesc, _method_data); }
 536   static int interpreter_invocation_counter_offset_in_bytes()
 537                                                  { return offset_of(methodOopDesc, _interpreter_invocation_count); }
 538   static int intrinsic_id_offset_in_bytes()      { return offset_of(methodOopDesc, _intrinsic_id); }
 539   static int intrinsic_id_size_in_bytes()        { return sizeof(u1); }
 540 
 541   // Static methods that are used to implement member methods where an exposed this pointer
 542   // is needed due to possible GCs
 543   static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS);
 544 
 545   // Returns the byte code index from the byte code pointer
 546   int     bci_from(address bcp) const;
 547   address bcp_from(int     bci) const;
 548   int validate_bci_from_bcx(intptr_t bcx) const;
 549 
 550   // Returns the line number for a bci if debugging information for the method is prowided,
 551   // -1 is returned otherwise.
 552   int line_number_from_bci(int bci) const;
 553 
 554   // Reflection support
 555   bool is_overridden_in(klassOop k) const;
 556 
 557   // JSR 292 support
 558   bool is_method_handle_invoke() const              { return access_flags().is_method_handle_invoke(); }
 559   static bool is_method_handle_invoke_name(vmSymbols::SID name_sid);
 560   static bool is_method_handle_invoke_name(symbolOop name) {
 561     return is_method_handle_invoke_name(vmSymbols::find_sid(name));
 562   }
 563   // Tests if this method is an internal adapter frame from the
 564   // MethodHandleCompiler.
 565   bool is_method_handle_adapter() const;
 566   static methodHandle make_invoke_method(KlassHandle holder,
 567                                          symbolHandle name, //invokeExact or invokeGeneric
 568                                          symbolHandle signature, //anything at all
 569                                          Handle method_type,
 570                                          TRAPS);
 571   // these operate only on invoke methods:
 572   oop method_handle_type() const;
 573   static jint* method_type_offsets_chain();  // series of pointer-offsets, terminated by -1
 574   // presize interpreter frames for extra interpreter stack entries, if needed
 575   // method handles want to be able to push a few extra values (e.g., a bound receiver), and
 576   // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
 577   // all without checking for a stack overflow
 578   static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); }
 579   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize()
 580 
 581   // RedefineClasses() support:
 582   bool is_old() const                               { return access_flags().is_old(); }
 583   void set_is_old()                                 { _access_flags.set_is_old(); }
 584   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 585   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 586   // see the definition in methodOop.cpp for the gory details
 587   bool should_not_be_cached() const;
 588 
 589   // JVMTI Native method prefixing support:
 590   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 591   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 592 
 593   // Rewriting support
 594   static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
 595                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 596 
 597   // Get this method's jmethodID -- allocate if it doesn't exist
 598   jmethodID jmethod_id()                            { methodHandle this_h(this);
 599                                                       return instanceKlass::get_jmethod_id(method_holder(), this_h); }
 600 
 601   // Lookup the jmethodID for this method.  Return NULL if not found.
 602   // NOTE that this function can be called from a signal handler
 603   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 604   // needs to be async-safe. No allocation should be done and
 605   // so handles are not used to avoid deadlock.
 606   jmethodID find_jmethod_id_or_null()               { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
 607 
 608   // JNI static invoke cached itable index accessors
 609   int cached_itable_index()                         { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
 610   void set_cached_itable_index(int index)           { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
 611 
 612   // Support for inlining of intrinsic methods
 613   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 614   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u1) id; }
 615 
 616   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 617   void init_intrinsic_id();     // updates from _none if a match
 618   static vmSymbols::SID klass_id_for_intrinsics(klassOop holder);
 619 
 620   // On-stack replacement support
 621   bool has_osr_nmethod(int level, bool match_level) {
 622    return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 623   }
 624 
 625   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 626     return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level);
 627   }
 628 
 629   // Inline cache support
 630   void cleanup_inline_caches();
 631 
 632   // Find if klass for method is loaded
 633   bool is_klass_loaded_by_klass_index(int klass_index) const;
 634   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 635 
 636   // Indicates whether compilation failed earlier for this method, or
 637   // whether it is not compilable for another reason like having a
 638   // breakpoint set in it.
 639   bool is_not_compilable(int comp_level = CompLevel_any) const;
 640   void set_not_compilable(int comp_level = CompLevel_all, bool report = true);
 641   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 642     set_not_compilable(comp_level, false);
 643   }
 644   bool is_not_osr_compilable(int comp_level = CompLevel_any) const {
 645     return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable();
 646   }
 647   void set_not_osr_compilable()               { _access_flags.set_not_osr_compilable();       }
 648   bool is_not_c1_compilable() const           { return access_flags().is_not_c1_compilable(); }
 649   void set_not_c1_compilable()                { _access_flags.set_not_c1_compilable();        }
 650   bool is_not_c2_compilable() const           { return access_flags().is_not_c2_compilable(); }
 651   void set_not_c2_compilable()                { _access_flags.set_not_c2_compilable();        }
 652 
 653   // Background compilation support
 654   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 655   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 656   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 657 
 658   static methodOop method_from_bcp(address bcp);
 659 
 660   // Resolve all classes in signature, return 'true' if successful
 661   static bool load_signature_classes(methodHandle m, TRAPS);
 662 
 663   // Return if true if not all classes references in signature, including return type, has been loaded
 664   static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
 665 
 666   // Printing
 667   void print_short_name(outputStream* st)        /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
 668   void print_name(outputStream* st)              PRODUCT_RETURN; // prints as "virtual void foo(int)"
 669 
 670   // Helper routine used for method sorting
 671   static void sort_methods(objArrayOop methods,
 672                            objArrayOop methods_annotations,
 673                            objArrayOop methods_parameter_annotations,
 674                            objArrayOop methods_default_annotations,
 675                            bool idempotent = false);
 676 
 677   // size of parameters
 678   void set_size_of_parameters(int size)          { _size_of_parameters = size; }
 679  private:
 680 
 681   // Inlined elements
 682   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
 683   address* signature_handler_addr() const        { return native_function_addr() + 1; }
 684 
 685   // Garbage collection support
 686   oop*  adr_constMethod() const                  { return (oop*)&_constMethod;     }
 687   oop*  adr_constants() const                    { return (oop*)&_constants;       }
 688   oop*  adr_method_data() const                  { return (oop*)&_method_data;     }
 689 };
 690 
 691 
 692 // Utility class for compressing line number tables
 693 
 694 class CompressedLineNumberWriteStream: public CompressedWriteStream {
 695  private:
 696   int _bci;
 697   int _line;
 698  public:
 699   // Constructor
 700   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
 701   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
 702 
 703   // Write (bci, line number) pair to stream
 704   void write_pair_regular(int bci_delta, int line_delta);
 705 
 706   inline void write_pair_inline(int bci, int line) {
 707     int bci_delta = bci - _bci;
 708     int line_delta = line - _line;
 709     _bci = bci;
 710     _line = line;
 711     // Skip (0,0) deltas - they do not add information and conflict with terminator.
 712     if (bci_delta == 0 && line_delta == 0) return;
 713     // Check if bci is 5-bit and line number 3-bit unsigned.
 714     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
 715       // Compress into single byte.
 716       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
 717       // Check that value doesn't match escape character.
 718       if (value != 0xFF) {
 719         write_byte(value);
 720         return;
 721       }
 722     }
 723     write_pair_regular(bci_delta, line_delta);
 724   }
 725 
 726 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
 727 // Disabling optimization doesn't work for methods in header files
 728 // so we force it to call through the non-optimized version in the .cpp.
 729 // It's gross, but it's the only way we can ensure that all callers are
 730 // fixed.  MSC_VER is defined in build/windows/makefiles/compile.make.
 731 #if defined(_M_AMD64) && MSC_VER >= 1400
 732   void write_pair(int bci, int line);
 733 #else
 734   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
 735 #endif
 736 
 737   // Write end-of-stream marker
 738   void write_terminator()                        { write_byte(0); }
 739 };
 740 
 741 
 742 // Utility class for decompressing line number tables
 743 
 744 class CompressedLineNumberReadStream: public CompressedReadStream {
 745  private:
 746   int _bci;
 747   int _line;
 748  public:
 749   // Constructor
 750   CompressedLineNumberReadStream(u_char* buffer);
 751   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
 752   bool read_pair();
 753   // Accessing bci and line number (after calling read_pair)
 754   int bci() const                               { return _bci; }
 755   int line() const                              { return _line; }
 756 };
 757 
 758 
 759 /// Fast Breakpoints.
 760 
 761 // If this structure gets more complicated (because bpts get numerous),
 762 // move it into its own header.
 763 
 764 // There is presently no provision for concurrent access
 765 // to breakpoint lists, which is only OK for JVMTI because
 766 // breakpoints are written only at safepoints, and are read
 767 // concurrently only outside of safepoints.
 768 
 769 class BreakpointInfo : public CHeapObj {
 770   friend class VMStructs;
 771  private:
 772   Bytecodes::Code  _orig_bytecode;
 773   int              _bci;
 774   u2               _name_index;       // of method
 775   u2               _signature_index;  // of method
 776   BreakpointInfo*  _next;             // simple storage allocation
 777 
 778  public:
 779   BreakpointInfo(methodOop m, int bci);
 780 
 781   // accessors
 782   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
 783   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
 784   int         bci()                                   { return _bci; }
 785 
 786   BreakpointInfo*          next() const               { return _next; }
 787   void                 set_next(BreakpointInfo* n)    { _next = n; }
 788 
 789   // helps for searchers
 790   bool match(methodOop m, int bci) {
 791     return bci == _bci && match(m);
 792   }
 793 
 794   bool match(methodOop m) {
 795     return _name_index == m->name_index() &&
 796       _signature_index == m->signature_index();
 797   }
 798 
 799   void set(methodOop method);
 800   void clear(methodOop method);
 801 };
 802 
 803 #endif // SHARE_VM_OOPS_METHODOOP_HPP