1 /*
   2  * Copyright (c) 1997, 2011, 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   // accessors for instance variables
 148   constMethodOop constMethod() const             { return _constMethod; }
 149   void set_constMethod(constMethodOop xconst)    { oop_store_without_check((oop*)&_constMethod, (oop)xconst); }
 150 
 151 
 152   static address make_adapters(methodHandle mh, TRAPS);
 153   volatile address from_compiled_entry() const   { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
 154   volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
 155 
 156   // access flag
 157   AccessFlags access_flags() const               { return _access_flags;  }
 158   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
 159 
 160   // name
 161   Symbol* name() const                           { return _constants->symbol_at(name_index()); }
 162   int name_index() const                         { return constMethod()->name_index();         }
 163   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
 164 
 165   // signature
 166   Symbol* signature() const                      { return _constants->symbol_at(signature_index()); }
 167   int signature_index() const                    { return constMethod()->signature_index();         }
 168   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
 169 
 170   // generics support
 171   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? _constants->symbol_at(idx) : (Symbol*)NULL); }
 172   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
 173   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
 174 
 175   // annotations support
 176   typeArrayOop annotations() const               { return instanceKlass::cast(method_holder())->get_method_annotations_of(method_idnum()); }
 177   typeArrayOop parameter_annotations() const     { return instanceKlass::cast(method_holder())->get_method_parameter_annotations_of(method_idnum()); }
 178   typeArrayOop annotation_default() const        { return instanceKlass::cast(method_holder())->get_method_default_annotations_of(method_idnum()); }
 179 
 180 #ifdef CC_INTERP
 181   void set_result_index(BasicType type);
 182   int  result_index()                            { return _result_index; }
 183 #endif
 184 
 185   // Helper routine: get klass name + "." + method name + signature as
 186   // C string, for the purpose of providing more useful NoSuchMethodErrors
 187   // and fatal error handling. The string is allocated in resource
 188   // area if a buffer is not provided by the caller.
 189   char* name_and_sig_as_C_string();
 190   char* name_and_sig_as_C_string(char* buf, int size);
 191 
 192   // Static routine in the situations we don't have a methodOop
 193   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
 194   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
 195 
 196   Bytecodes::Code java_code_at(int bci) const {
 197     return Bytecodes::java_code_at(this, bcp_from(bci));
 198   }
 199   Bytecodes::Code code_at(int bci) const {
 200     return Bytecodes::code_at(this, bcp_from(bci));
 201   }
 202 
 203   // JVMTI breakpoints
 204   Bytecodes::Code orig_bytecode_at(int bci) const;
 205   void        set_orig_bytecode_at(int bci, Bytecodes::Code code);
 206   void set_breakpoint(int bci);
 207   void clear_breakpoint(int bci);
 208   void clear_all_breakpoints();
 209   // Tracking number of breakpoints, for fullspeed debugging.
 210   // Only mutated by VM thread.
 211   u2   number_of_breakpoints() const             { return _number_of_breakpoints; }
 212   void incr_number_of_breakpoints()              { ++_number_of_breakpoints; }
 213   void decr_number_of_breakpoints()              { --_number_of_breakpoints; }
 214   // Initialization only
 215   void clear_number_of_breakpoints()             { _number_of_breakpoints = 0; }
 216 
 217   // index into instanceKlass methods() array
 218   u2 method_idnum() const           { return constMethod()->method_idnum(); }
 219   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
 220 
 221   // code size
 222   int code_size() const                  { return constMethod()->code_size(); }
 223 
 224   // method size
 225   int method_size() const                        { return _method_size; }
 226   void set_method_size(int size) {
 227     assert(0 <= size && size < (1 << 16), "invalid method size");
 228     _method_size = size;
 229   }
 230 
 231   // constant pool for klassOop holding this method
 232   constantPoolOop constants() const              { return _constants; }
 233   void set_constants(constantPoolOop c)          { oop_store_without_check((oop*)&_constants, c); }
 234 
 235   // max stack
 236   int  max_stack() const                         { return _max_stack; }
 237   void set_max_stack(int size)                   { _max_stack = size; }
 238 
 239   // max locals
 240   int  max_locals() const                        { return _max_locals; }
 241   void set_max_locals(int size)                  { _max_locals = size; }
 242 
 243   int highest_comp_level() const;
 244   void set_highest_comp_level(int level);
 245   int highest_osr_comp_level() const;
 246   void set_highest_osr_comp_level(int level);
 247 
 248   // Count of times method was exited via exception while interpreting
 249   void interpreter_throwout_increment() {
 250     if (_interpreter_throwout_count < 65534) {
 251       _interpreter_throwout_count++;
 252     }
 253   }
 254 
 255   int  interpreter_throwout_count() const        { return _interpreter_throwout_count; }
 256   void set_interpreter_throwout_count(int count) { _interpreter_throwout_count = count; }
 257 
 258   // size of parameters
 259   int  size_of_parameters() const                { return _size_of_parameters; }
 260 
 261   bool has_stackmap_table() const {
 262     return constMethod()->has_stackmap_table();
 263   }
 264 
 265   typeArrayOop stackmap_data() const {
 266     return constMethod()->stackmap_data();
 267   }
 268 
 269   void set_stackmap_data(typeArrayOop sd) {
 270     constMethod()->set_stackmap_data(sd);
 271   }
 272 
 273   // exception handler table
 274   typeArrayOop exception_table() const
 275                                    { return constMethod()->exception_table(); }
 276   void set_exception_table(typeArrayOop e)
 277                                      { constMethod()->set_exception_table(e); }
 278   bool has_exception_handler() const
 279                              { return constMethod()->has_exception_handler(); }
 280 
 281   // Finds the first entry point bci of an exception handler for an
 282   // exception of klass ex_klass thrown at throw_bci. A value of NULL
 283   // for ex_klass indicates that the exception klass is not known; in
 284   // this case it matches any constraint class. Returns -1 if the
 285   // exception cannot be handled in this method. The handler
 286   // constraint classes are loaded if necessary. Note that this may
 287   // throw an exception if loading of the constraint classes causes
 288   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
 289   // If an exception is thrown, returns the bci of the
 290   // exception handler which caused the exception to be thrown, which
 291   // is needed for proper retries. See, for example,
 292   // InterpreterRuntime::exception_handler_for_exception.
 293   int fast_exception_handler_bci_for(KlassHandle ex_klass, int throw_bci, TRAPS);
 294 
 295   // method data access
 296   methodDataOop method_data() const              {
 297     return _method_data;
 298   }
 299   void set_method_data(methodDataOop data)       {
 300     oop_store_without_check((oop*)&_method_data, (oop)data);
 301   }
 302 
 303   // invocation counter
 304   InvocationCounter* invocation_counter() { return &_invocation_counter; }
 305   InvocationCounter* backedge_counter()   { return &_backedge_counter; }
 306 
 307   int invocation_count();
 308   int backedge_count();
 309 
 310   bool was_executed_more_than(int n);
 311   bool was_never_executed()                      { return !was_executed_more_than(0); }
 312 
 313   static void build_interpreter_method_data(methodHandle method, TRAPS);
 314 
 315   int interpreter_invocation_count() {
 316     if (TieredCompilation) return invocation_count();
 317     else return _interpreter_invocation_count;
 318   }
 319   void set_interpreter_invocation_count(int count) { _interpreter_invocation_count = count; }
 320   int increment_interpreter_invocation_count() {
 321     if (TieredCompilation) ShouldNotReachHere();
 322     return ++_interpreter_invocation_count;
 323   }
 324 
 325 #ifndef PRODUCT
 326   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
 327   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 328 #endif // not PRODUCT
 329 
 330   // Clear (non-shared space) pointers which could not be relevant
 331   // if this (shared) method were mapped into another JVM.
 332   void remove_unshareable_info();
 333 
 334   // nmethod/verified compiler entry
 335   address verified_code_entry();
 336   bool check_code() const;      // Not inline to avoid circular ref
 337   nmethod* volatile code() const                 { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
 338   void clear_code();            // Clear out any compiled code
 339   static void set_code(methodHandle mh, nmethod* code);
 340   void set_adapter_entry(AdapterHandlerEntry* adapter) {  _adapter = adapter; }
 341   address get_i2c_entry();
 342   address get_c2i_entry();
 343   address get_c2i_unverified_entry();
 344   AdapterHandlerEntry* adapter() {  return _adapter; }
 345   // setup entry points
 346   void link_method(methodHandle method, TRAPS);
 347   // clear entry points. Used by sharing code
 348   void unlink_method();
 349 
 350   // vtable index
 351   enum VtableIndexFlag {
 352     // Valid vtable indexes are non-negative (>= 0).
 353     // These few negative values are used as sentinels.
 354     highest_unused_vtable_index_value = -5,
 355     invalid_vtable_index    = -4,  // distinct from any valid vtable index
 356     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
 357     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
 358     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
 359   };
 360   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
 361   int  vtable_index() const                      { assert(valid_vtable_index(), "");
 362                                                    return _vtable_index; }
 363   void set_vtable_index(int index)               { _vtable_index = index; }
 364 
 365   // interpreter entry
 366   address interpreter_entry() const              { return _i2i_entry; }
 367   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
 368   void set_interpreter_entry(address entry)      { _i2i_entry = entry;  _from_interpreted_entry = entry; }
 369   int  interpreter_kind(void) {
 370      return constMethod()->interpreter_kind();
 371   }
 372   void set_interpreter_kind();
 373   void set_interpreter_kind(int kind) {
 374     constMethod()->set_interpreter_kind(kind);
 375   }
 376 
 377   // native function (used for native methods only)
 378   enum {
 379     native_bind_event_is_interesting = true
 380   };
 381   address native_function() const                { return *(native_function_addr()); }
 382   // Must specify a real function (not NULL).
 383   // Use clear_native_function() to unregister.
 384   void set_native_function(address function, bool post_event_flag);
 385   bool has_native_function() const;
 386   void clear_native_function();
 387 
 388   // signature handler (used for native methods only)
 389   address signature_handler() const              { return *(signature_handler_addr()); }
 390   void set_signature_handler(address handler);
 391 
 392   // Interpreter oopmap support
 393   void mask_for(int bci, InterpreterOopMap* mask);
 394 
 395 #ifndef PRODUCT
 396   // operations on invocation counter
 397   void print_invocation_count();
 398 #endif
 399 
 400   // byte codes
 401   void    set_code(address code)      { return constMethod()->set_code(code); }
 402   address code_base() const           { return constMethod()->code_base(); }
 403   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
 404 
 405   // prints byte codes
 406   void print_codes() const            { print_codes_on(tty); }
 407   void print_codes_on(outputStream* st) const                      PRODUCT_RETURN;
 408   void print_codes_on(int from, int to, outputStream* st) const    PRODUCT_RETURN;
 409 
 410   // checked exceptions
 411   int checked_exceptions_length() const
 412                          { return constMethod()->checked_exceptions_length(); }
 413   CheckedExceptionElement* checked_exceptions_start() const
 414                           { return constMethod()->checked_exceptions_start(); }
 415 
 416   // localvariable table
 417   bool has_localvariable_table() const
 418                           { return constMethod()->has_localvariable_table(); }
 419   int localvariable_table_length() const
 420                         { return constMethod()->localvariable_table_length(); }
 421   LocalVariableTableElement* localvariable_table_start() const
 422                          { return constMethod()->localvariable_table_start(); }
 423 
 424   bool has_linenumber_table() const
 425                               { return constMethod()->has_linenumber_table(); }
 426   u_char* compressed_linenumber_table() const
 427                        { return constMethod()->compressed_linenumber_table(); }
 428 
 429   // method holder (the klassOop holding this method)
 430   klassOop method_holder() const                 { return _constants->pool_holder(); }
 431 
 432   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
 433   Symbol* klass_name() const;                    // returns the name of the method holder
 434   BasicType result_type() const;                 // type of the method result
 435   int result_type_index() const;                 // type index of the method result
 436   bool is_returning_oop() const                  { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
 437   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
 438 
 439   // Checked exceptions thrown by this method (resolved to mirrors)
 440   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
 441 
 442   // Access flags
 443   bool is_public() const                         { return access_flags().is_public();      }
 444   bool is_private() const                        { return access_flags().is_private();     }
 445   bool is_protected() const                      { return access_flags().is_protected();   }
 446   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
 447   bool is_static() const                         { return access_flags().is_static();      }
 448   bool is_final() const                          { return access_flags().is_final();       }
 449   bool is_synchronized() const                   { return access_flags().is_synchronized();}
 450   bool is_native() const                         { return access_flags().is_native();      }
 451   bool is_abstract() const                       { return access_flags().is_abstract();    }
 452   bool is_strict() const                         { return access_flags().is_strict();      }
 453   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
 454 
 455   // returns true if contains only return operation
 456   bool is_empty_method() const;
 457 
 458   // returns true if this is a vanilla constructor
 459   bool is_vanilla_constructor() const;
 460 
 461   // checks method and its method holder
 462   bool is_final_method() const;
 463   bool is_strict_method() const;
 464 
 465   // true if method needs no dynamic dispatch (final and/or no vtable entry)
 466   bool can_be_statically_bound() const;
 467 
 468   // returns true if the method has any backward branches.
 469   bool has_loops() {
 470     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
 471   };
 472 
 473   bool compute_has_loops_flag();
 474 
 475   bool has_jsrs() {
 476     return access_flags().has_jsrs();
 477   };
 478   void set_has_jsrs() {
 479     _access_flags.set_has_jsrs();
 480   }
 481 
 482   // returns true if the method has any monitors.
 483   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
 484   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
 485 
 486   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
 487 
 488   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
 489   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
 490   // has not been computed yet.
 491   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
 492   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
 493 
 494   // returns true if the method is an accessor function (setter/getter).
 495   bool is_accessor() const;
 496 
 497   // returns true if the method is an initializer (<init> or <clinit>).
 498   bool is_initializer() const;
 499 
 500   // compiled code support
 501   // NOTE: code() is inherently racy as deopt can be clearing code
 502   // simultaneously. Use with caution.
 503   bool has_compiled_code() const                 { return code() != NULL; }
 504 
 505   // sizing
 506   static int object_size(bool is_native);
 507   static int header_size()                       { return sizeof(methodOopDesc)/HeapWordSize; }
 508   int object_size() const                        { return method_size(); }
 509 
 510   bool object_is_parsable() const                { return method_size() > 0; }
 511 
 512   // interpreter support
 513   static ByteSize const_offset()                 { return byte_offset_of(methodOopDesc, _constMethod       ); }
 514   static ByteSize constants_offset()             { return byte_offset_of(methodOopDesc, _constants         ); }
 515   static ByteSize access_flags_offset()          { return byte_offset_of(methodOopDesc, _access_flags      ); }
 516 #ifdef CC_INTERP
 517   static ByteSize result_index_offset()          { return byte_offset_of(methodOopDesc, _result_index ); }
 518 #endif /* CC_INTERP */
 519   static ByteSize size_of_locals_offset()        { return byte_offset_of(methodOopDesc, _max_locals        ); }
 520   static ByteSize size_of_parameters_offset()    { return byte_offset_of(methodOopDesc, _size_of_parameters); }
 521   static ByteSize from_compiled_offset()         { return byte_offset_of(methodOopDesc, _from_compiled_entry); }
 522   static ByteSize code_offset()                  { return byte_offset_of(methodOopDesc, _code); }
 523   static ByteSize invocation_counter_offset()    { return byte_offset_of(methodOopDesc, _invocation_counter); }
 524   static ByteSize backedge_counter_offset()      { return byte_offset_of(methodOopDesc, _backedge_counter); }
 525   static ByteSize method_data_offset()           {
 526     return byte_offset_of(methodOopDesc, _method_data);
 527   }
 528   static ByteSize interpreter_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _interpreter_invocation_count); }
 529 #ifndef PRODUCT
 530   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(methodOopDesc, _compiled_invocation_count); }
 531 #endif // not PRODUCT
 532   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(methodOopDesc));                 }
 533   static ByteSize from_interpreted_offset()      { return byte_offset_of(methodOopDesc, _from_interpreted_entry ); }
 534   static ByteSize interpreter_entry_offset()     { return byte_offset_of(methodOopDesc, _i2i_entry ); }
 535   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(methodOopDesc) + wordSize);      }
 536   static ByteSize max_stack_offset()             { return byte_offset_of(methodOopDesc, _max_stack         ); }
 537 
 538   // for code generation
 539   static int method_data_offset_in_bytes()       { return offset_of(methodOopDesc, _method_data); }
 540   static int interpreter_invocation_counter_offset_in_bytes()
 541                                                  { return offset_of(methodOopDesc, _interpreter_invocation_count); }
 542   static int intrinsic_id_offset_in_bytes()      { return offset_of(methodOopDesc, _intrinsic_id); }
 543   static int intrinsic_id_size_in_bytes()        { return sizeof(u1); }
 544 
 545   // Static methods that are used to implement member methods where an exposed this pointer
 546   // is needed due to possible GCs
 547   static objArrayHandle resolved_checked_exceptions_impl(methodOop this_oop, TRAPS);
 548 
 549   // Returns the byte code index from the byte code pointer
 550   int     bci_from(address bcp) const;
 551   address bcp_from(int     bci) const;
 552   int validate_bci_from_bcx(intptr_t bcx) const;
 553 
 554   // Returns the line number for a bci if debugging information for the method is prowided,
 555   // -1 is returned otherwise.
 556   int line_number_from_bci(int bci) const;
 557 
 558   // Reflection support
 559   bool is_overridden_in(klassOop k) const;
 560 
 561   // JSR 292 support
 562   bool is_method_handle_invoke() const              { return access_flags().is_method_handle_invoke(); }
 563   static bool is_method_handle_invoke_name(vmSymbols::SID name_sid);
 564   static bool is_method_handle_invoke_name(Symbol* name) {
 565     return is_method_handle_invoke_name(vmSymbols::find_sid(name));
 566   }
 567   // Tests if this method is an internal adapter frame from the
 568   // MethodHandleCompiler.
 569   bool is_method_handle_adapter() const;
 570   static methodHandle make_invoke_method(KlassHandle holder,
 571                                          Symbol* name, //invokeExact or invokeGeneric
 572                                          Symbol* signature, //anything at all
 573                                          Handle method_type,
 574                                          TRAPS);
 575   // these operate only on invoke methods:
 576   oop method_handle_type() const;
 577   static jint* method_type_offsets_chain();  // series of pointer-offsets, terminated by -1
 578   // presize interpreter frames for extra interpreter stack entries, if needed
 579   // method handles want to be able to push a few extra values (e.g., a bound receiver), and
 580   // invokedynamic sometimes needs to push a bootstrap method, call site, and arglist,
 581   // all without checking for a stack overflow
 582   static int extra_stack_entries() { return (EnableMethodHandles ? (int)MethodHandlePushLimit : 0) + (EnableInvokeDynamic ? 3 : 0); }
 583   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize()
 584 
 585   // RedefineClasses() support:
 586   bool is_old() const                               { return access_flags().is_old(); }
 587   void set_is_old()                                 { _access_flags.set_is_old(); }
 588   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
 589   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
 590   // see the definition in methodOop.cpp for the gory details
 591   bool should_not_be_cached() const;
 592 
 593   // JVMTI Native method prefixing support:
 594   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
 595   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
 596 
 597   // Rewriting support
 598   static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
 599                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
 600 
 601   // Get this method's jmethodID -- allocate if it doesn't exist
 602   jmethodID jmethod_id()                            { methodHandle this_h(this);
 603                                                       return instanceKlass::get_jmethod_id(method_holder(), this_h); }
 604 
 605   // Lookup the jmethodID for this method.  Return NULL if not found.
 606   // NOTE that this function can be called from a signal handler
 607   // (see AsyncGetCallTrace support for Forte Analyzer) and this
 608   // needs to be async-safe. No allocation should be done and
 609   // so handles are not used to avoid deadlock.
 610   jmethodID find_jmethod_id_or_null()               { return instanceKlass::cast(method_holder())->jmethod_id_or_null(this); }
 611 
 612   // JNI static invoke cached itable index accessors
 613   int cached_itable_index()                         { return instanceKlass::cast(method_holder())->cached_itable_index(method_idnum()); }
 614   void set_cached_itable_index(int index)           { instanceKlass::cast(method_holder())->set_cached_itable_index(method_idnum(), index); }
 615 
 616   // Support for inlining of intrinsic methods
 617   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
 618   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u1) id; }
 619 
 620   // Helper routines for intrinsic_id() and vmIntrinsics::method().
 621   void init_intrinsic_id();     // updates from _none if a match
 622   static vmSymbols::SID klass_id_for_intrinsics(klassOop holder);
 623 
 624   // On-stack replacement support
 625   bool has_osr_nmethod(int level, bool match_level) {
 626    return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
 627   }
 628 
 629   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
 630     return instanceKlass::cast(method_holder())->lookup_osr_nmethod(this, bci, level, match_level);
 631   }
 632 
 633   // Inline cache support
 634   void cleanup_inline_caches();
 635 
 636   // Find if klass for method is loaded
 637   bool is_klass_loaded_by_klass_index(int klass_index) const;
 638   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
 639 
 640   // Indicates whether compilation failed earlier for this method, or
 641   // whether it is not compilable for another reason like having a
 642   // breakpoint set in it.
 643   bool is_not_compilable(int comp_level = CompLevel_any) const;
 644   void set_not_compilable(int comp_level = CompLevel_all, bool report = true);
 645   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
 646     set_not_compilable(comp_level, false);
 647   }
 648   bool is_not_osr_compilable(int comp_level = CompLevel_any) const {
 649     return is_not_compilable(comp_level) || access_flags().is_not_osr_compilable();
 650   }
 651   void set_not_osr_compilable()               { _access_flags.set_not_osr_compilable();       }
 652   bool is_not_c1_compilable() const           { return access_flags().is_not_c1_compilable(); }
 653   void set_not_c1_compilable()                { _access_flags.set_not_c1_compilable();        }
 654   bool is_not_c2_compilable() const           { return access_flags().is_not_c2_compilable(); }
 655   void set_not_c2_compilable()                { _access_flags.set_not_c2_compilable();        }
 656 
 657   // Background compilation support
 658   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
 659   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
 660   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
 661 
 662   // Resolve all classes in signature, return 'true' if successful
 663   static bool load_signature_classes(methodHandle m, TRAPS);
 664 
 665   // Return if true if not all classes references in signature, including return type, has been loaded
 666   static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
 667 
 668   // Printing
 669   void print_short_name(outputStream* st)        /*PRODUCT_RETURN*/; // prints as klassname::methodname; Exposed so field engineers can debug VM
 670   void print_name(outputStream* st)              PRODUCT_RETURN; // prints as "virtual void foo(int)"
 671 
 672   // Helper routine used for method sorting
 673   static void sort_methods(objArrayOop methods,
 674                            objArrayOop methods_annotations,
 675                            objArrayOop methods_parameter_annotations,
 676                            objArrayOop methods_default_annotations,
 677                            bool idempotent = false);
 678 
 679   // size of parameters
 680   void set_size_of_parameters(int size)          { _size_of_parameters = size; }
 681  private:
 682 
 683   // Inlined elements
 684   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
 685   address* signature_handler_addr() const        { return native_function_addr() + 1; }
 686 
 687   // Garbage collection support
 688   oop*  adr_constMethod() const                  { return (oop*)&_constMethod;     }
 689   oop*  adr_constants() const                    { return (oop*)&_constants;       }
 690   oop*  adr_method_data() const                  { return (oop*)&_method_data;     }
 691 };
 692 
 693 
 694 // Utility class for compressing line number tables
 695 
 696 class CompressedLineNumberWriteStream: public CompressedWriteStream {
 697  private:
 698   int _bci;
 699   int _line;
 700  public:
 701   // Constructor
 702   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
 703   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
 704 
 705   // Write (bci, line number) pair to stream
 706   void write_pair_regular(int bci_delta, int line_delta);
 707 
 708   inline void write_pair_inline(int bci, int line) {
 709     int bci_delta = bci - _bci;
 710     int line_delta = line - _line;
 711     _bci = bci;
 712     _line = line;
 713     // Skip (0,0) deltas - they do not add information and conflict with terminator.
 714     if (bci_delta == 0 && line_delta == 0) return;
 715     // Check if bci is 5-bit and line number 3-bit unsigned.
 716     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
 717       // Compress into single byte.
 718       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
 719       // Check that value doesn't match escape character.
 720       if (value != 0xFF) {
 721         write_byte(value);
 722         return;
 723       }
 724     }
 725     write_pair_regular(bci_delta, line_delta);
 726   }
 727 
 728 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
 729 // Disabling optimization doesn't work for methods in header files
 730 // so we force it to call through the non-optimized version in the .cpp.
 731 // It's gross, but it's the only way we can ensure that all callers are
 732 // fixed.  _MSC_VER is defined by the windows compiler
 733 #if defined(_M_AMD64) && _MSC_VER >= 1400
 734   void write_pair(int bci, int line);
 735 #else
 736   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
 737 #endif
 738 
 739   // Write end-of-stream marker
 740   void write_terminator()                        { write_byte(0); }
 741 };
 742 
 743 
 744 // Utility class for decompressing line number tables
 745 
 746 class CompressedLineNumberReadStream: public CompressedReadStream {
 747  private:
 748   int _bci;
 749   int _line;
 750  public:
 751   // Constructor
 752   CompressedLineNumberReadStream(u_char* buffer);
 753   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
 754   bool read_pair();
 755   // Accessing bci and line number (after calling read_pair)
 756   int bci() const                               { return _bci; }
 757   int line() const                              { return _line; }
 758 };
 759 
 760 
 761 /// Fast Breakpoints.
 762 
 763 // If this structure gets more complicated (because bpts get numerous),
 764 // move it into its own header.
 765 
 766 // There is presently no provision for concurrent access
 767 // to breakpoint lists, which is only OK for JVMTI because
 768 // breakpoints are written only at safepoints, and are read
 769 // concurrently only outside of safepoints.
 770 
 771 class BreakpointInfo : public CHeapObj {
 772   friend class VMStructs;
 773  private:
 774   Bytecodes::Code  _orig_bytecode;
 775   int              _bci;
 776   u2               _name_index;       // of method
 777   u2               _signature_index;  // of method
 778   BreakpointInfo*  _next;             // simple storage allocation
 779 
 780  public:
 781   BreakpointInfo(methodOop m, int bci);
 782 
 783   // accessors
 784   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
 785   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
 786   int         bci()                                   { return _bci; }
 787 
 788   BreakpointInfo*          next() const               { return _next; }
 789   void                 set_next(BreakpointInfo* n)    { _next = n; }
 790 
 791   // helps for searchers
 792   bool match(const methodOopDesc* m, int bci) {
 793     return bci == _bci && match(m);
 794   }
 795 
 796   bool match(const methodOopDesc* m) {
 797     return _name_index == m->name_index() &&
 798       _signature_index == m->signature_index();
 799   }
 800 
 801   void set(methodOop method);
 802   void clear(methodOop method);
 803 };
 804 
 805 #endif // SHARE_VM_OOPS_METHODOOP_HPP