jdk8-mips64-public/hotspot: src/share/vm/oops/method.hpp@7301840ea20e (annotated)

src/share/vm/oops/method.hpp@7301840ea20e (annotated)

src/share/vm/oops/method.hpp

Tue, 11 Mar 2014 15:06:34 +0400

author: vlivanov
date: Tue, 11 Mar 2014 15:06:34 +0400
changeset 7179: 7301840ea20e
parent 6678: 7384f6a12fc1
child 7203: 966205f0e717
permissions: -rw-r--r--

8023461: Thread holding lock at safepoint that vm can block on: MethodCompileQueue_lock
Reviewed-by: kvn, iveresov

 /*
  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #ifndef SHARE_VM_OOPS_METHODOOP_HPP
 #define SHARE_VM_OOPS_METHODOOP_HPP
 #include "classfile/vmSymbols.hpp"
 #include "code/compressedStream.hpp"
 #include "compiler/oopMap.hpp"
 #include "interpreter/invocationCounter.hpp"
 #include "oops/annotations.hpp"
 #include "oops/constantPool.hpp"
 #include "oops/methodCounters.hpp"
 #include "oops/instanceKlass.hpp"
 #include "oops/oop.hpp"
 #include "oops/typeArrayOop.hpp"
 #include "utilities/accessFlags.hpp"
 #include "utilities/growableArray.hpp"
 // A Method* represents a Java method.
 //
 // Memory layout (each line represents a word). Note that most applications load thousands of methods,
 // so keeping the size of this structure small has a big impact on footprint.
 //
 // We put all oops and method_size first for better gc cache locality.
 //
 // The actual bytecodes are inlined after the end of the Method struct.
 //
 // There are bits in the access_flags telling whether inlined tables are present.
 // Note that accessing the line number and local variable tables is not performance critical at all.
 // Accessing the checked exceptions table is used by reflection, so we put that last to make access
 // to it fast.
 //
 // The line number table is compressed and inlined following the byte codes. It is found as the first
 // byte following the byte codes. The checked exceptions table and the local variable table are inlined
 // after the line number table, and indexed from the end of the method. We do not compress the checked
 // exceptions table since the average length is less than 2, and do not bother to compress the local
 // variable table either since it is mostly absent.
 //
 // Note that native_function and signature_handler has to be at fixed offsets (required by the interpreter)
 //
 // |------------------------------------------------------|
 // | header                                               |
 // | klass                                                |
 // |------------------------------------------------------|
 // | ConstMethod*                   (oop)                 |
 // |------------------------------------------------------|
 // | methodData                     (oop)                 |
 // | methodCounters                                       |
 // |------------------------------------------------------|
 // | access_flags                                         |
 // | vtable_index                                         |
 // |------------------------------------------------------|
 // | result_index (C++ interpreter only)                  |
 // |------------------------------------------------------|
 // | method_size             |   intrinsic_id|   flags    |
 // |------------------------------------------------------|
 // | code                           (pointer)             |
 // | i2i                            (pointer)             |
 // | adapter                        (pointer)             |
 // | from_compiled_entry            (pointer)             |
 // | from_interpreted_entry         (pointer)             |
 // |------------------------------------------------------|
 // | native_function       (present only if native)       |
 // | signature_handler     (present only if native)       |
 // |------------------------------------------------------|
 class CheckedExceptionElement;
 class LocalVariableTableElement;
 class AdapterHandlerEntry;
 class MethodData;
 class MethodCounters;
 class ConstMethod;
 class InlineTableSizes;
 class KlassSizeStats;
 class Method : public Metadata {
  friend class VMStructs;
  private:
   ConstMethod*      _constMethod;                // Method read-only data.
   MethodData*       _method_data;
   MethodCounters*   _method_counters;
   AccessFlags       _access_flags;               // Access flags
   int               _vtable_index;               // vtable index of this method (see VtableIndexFlag)
                                                  // note: can have vtables with >2**16 elements (because of inheritance)
 #ifdef CC_INTERP
   int               _result_index;               // C++ interpreter needs for converting results to/from stack
 #endif
   u2                _method_size;                // size of this object
   u1                _intrinsic_id;               // vmSymbols::intrinsic_id (0 == _none)
   u1                _jfr_towrite      : 1,       // Flags
                     _caller_sensitive : 1,
                     _force_inline     : 1,
                     _hidden           : 1,
                     _dont_inline      : 1,
                                       : 3;
 #ifndef PRODUCT
   int               _compiled_invocation_count;  // Number of nmethod invocations so far (for perf. debugging)
 #endif
   // Entry point for calling both from and to the interpreter.
   address _i2i_entry;           // All-args-on-stack calling convention
   // Adapter blob (i2c/c2i) for this Method*. Set once when method is linked.
   AdapterHandlerEntry* _adapter;
   // Entry point for calling from compiled code, to compiled code if it exists
   // or else the interpreter.
   volatile address _from_compiled_entry;        // Cache of: _code ? _code->entry_point() : _adapter->c2i_entry()
   // The entry point for calling both from and to compiled code is
   // "_code->entry_point()".  Because of tiered compilation and de-opt, this
   // field can come and go.  It can transition from NULL to not-null at any
   // time (whenever a compile completes).  It can transition from not-null to
   // NULL only at safepoints (because of a de-opt).
   nmethod* volatile _code;                       // Points to the corresponding piece of native code
   volatile address           _from_interpreted_entry; // Cache of _code ? _adapter->i2c_entry() : _i2i_entry
   // Constructor
   Method(ConstMethod* xconst, AccessFlags access_flags, int size);
  public:
   static Method* allocate(ClassLoaderData* loader_data,
                           int byte_code_size,
                           AccessFlags access_flags,
                           InlineTableSizes* sizes,
                           ConstMethod::MethodType method_type,
                           TRAPS);
   // CDS and vtbl checking can create an empty Method to get vtbl pointer.
   Method(){}
   // The Method vtable is restored by this call when the Method is in the
   // shared archive.  See patch_klass_vtables() in metaspaceShared.cpp for
   // all the gory details.  SA, dtrace and pstack helpers distinguish metadata
   // by their vtable.
   void restore_vtable() { guarantee(is_method(), "vtable restored by this call"); }
   bool is_method() const volatile { return true; }
   void restore_unshareable_info(TRAPS);
   // accessors for instance variables
   ConstMethod* constMethod() const             { return _constMethod; }
   void set_constMethod(ConstMethod* xconst)    { _constMethod = xconst; }
   static address make_adapters(methodHandle mh, TRAPS);
   volatile address from_compiled_entry() const   { return (address)OrderAccess::load_ptr_acquire(&_from_compiled_entry); }
   volatile address from_interpreted_entry() const{ return (address)OrderAccess::load_ptr_acquire(&_from_interpreted_entry); }
   // access flag
   AccessFlags access_flags() const               { return _access_flags;  }
   void set_access_flags(AccessFlags flags)       { _access_flags = flags; }
   // name
   Symbol* name() const                           { return constants()->symbol_at(name_index()); }
   int name_index() const                         { return constMethod()->name_index();         }
   void set_name_index(int index)                 { constMethod()->set_name_index(index);       }
   // signature
   Symbol* signature() const                      { return constants()->symbol_at(signature_index()); }
   int signature_index() const                    { return constMethod()->signature_index();         }
   void set_signature_index(int index)            { constMethod()->set_signature_index(index);       }
   // generics support
   Symbol* generic_signature() const              { int idx = generic_signature_index(); return ((idx != 0) ? constants()->symbol_at(idx) : (Symbol*)NULL); }
   int generic_signature_index() const            { return constMethod()->generic_signature_index(); }
   void set_generic_signature_index(int index)    { constMethod()->set_generic_signature_index(index); }
   // annotations support
   AnnotationArray* annotations() const           {
     return constMethod()->method_annotations();
   }
   AnnotationArray* parameter_annotations() const {
     return constMethod()->parameter_annotations();
   }
   AnnotationArray* annotation_default() const    {
     return constMethod()->default_annotations();
   }
   AnnotationArray* type_annotations() const      {
     return constMethod()->type_annotations();
   }
 #ifdef CC_INTERP
   void set_result_index(BasicType type);
   int  result_index()                            { return _result_index; }
 #endif
   // Helper routine: get klass name + "." + method name + signature as
   // C string, for the purpose of providing more useful NoSuchMethodErrors
   // and fatal error handling. The string is allocated in resource
   // area if a buffer is not provided by the caller.
   char* name_and_sig_as_C_string() const;
   char* name_and_sig_as_C_string(char* buf, int size) const;
   // Static routine in the situations we don't have a Method*
   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature);
   static char* name_and_sig_as_C_string(Klass* klass, Symbol* method_name, Symbol* signature, char* buf, int size);
   Bytecodes::Code java_code_at(int bci) const {
     return Bytecodes::java_code_at(this, bcp_from(bci));
   }
   Bytecodes::Code code_at(int bci) const {
     return Bytecodes::code_at(this, bcp_from(bci));
   }
   // JVMTI breakpoints
   Bytecodes::Code orig_bytecode_at(int bci) const;
   void        set_orig_bytecode_at(int bci, Bytecodes::Code code);
   void set_breakpoint(int bci);
   void clear_breakpoint(int bci);
   void clear_all_breakpoints();
   // Tracking number of breakpoints, for fullspeed debugging.
   // Only mutated by VM thread.
   u2   number_of_breakpoints()             const {
     MethodCounters* mcs = method_counters();
     if (mcs == NULL) {
       return 0;
     } else {
       return mcs->number_of_breakpoints();
     }
   }
   void incr_number_of_breakpoints(TRAPS)         {
     MethodCounters* mcs = get_method_counters(CHECK);
     if (mcs != NULL) {
       mcs->incr_number_of_breakpoints();
     }
   }
   void decr_number_of_breakpoints(TRAPS)         {
     MethodCounters* mcs = get_method_counters(CHECK);
     if (mcs != NULL) {
       mcs->decr_number_of_breakpoints();
     }
   }
   // Initialization only
   void clear_number_of_breakpoints()             {
     MethodCounters* mcs = method_counters();
     if (mcs != NULL) {
       mcs->clear_number_of_breakpoints();
     }
   }
   // index into InstanceKlass methods() array
   // note: also used by jfr
   u2 method_idnum() const           { return constMethod()->method_idnum(); }
   void set_method_idnum(u2 idnum)   { constMethod()->set_method_idnum(idnum); }
   // code size
   int code_size() const                  { return constMethod()->code_size(); }
   // method size
   int method_size() const                        { return _method_size; }
   void set_method_size(int size) {
     assert(0 <= size && size < (1 << 16), "invalid method size");
     _method_size = size;
   }
   // constant pool for Klass* holding this method
   ConstantPool* constants() const              { return constMethod()->constants(); }
   void set_constants(ConstantPool* c)          { constMethod()->set_constants(c); }
   // max stack
   // return original max stack size for method verification
   int  verifier_max_stack() const                { return constMethod()->max_stack(); }
   int           max_stack() const                { return constMethod()->max_stack() + extra_stack_entries(); }
   void      set_max_stack(int size)              {        constMethod()->set_max_stack(size); }
   // max locals
   int  max_locals() const                        { return constMethod()->max_locals(); }
   void set_max_locals(int size)                  { constMethod()->set_max_locals(size); }
   int highest_comp_level() const;
   void set_highest_comp_level(int level);
   int highest_osr_comp_level() const;
   void set_highest_osr_comp_level(int level);
   // Count of times method was exited via exception while interpreting
   void interpreter_throwout_increment(TRAPS) {
     MethodCounters* mcs = get_method_counters(CHECK);
     if (mcs != NULL) {
       mcs->interpreter_throwout_increment();
     }
   }
   int  interpreter_throwout_count() const        {
     MethodCounters* mcs = method_counters();
     if (mcs == NULL) {
       return 0;
     } else {
       return mcs->interpreter_throwout_count();
     }
   }
   // size of parameters
   int  size_of_parameters() const                { return constMethod()->size_of_parameters(); }
   void set_size_of_parameters(int size)          { constMethod()->set_size_of_parameters(size); }
   bool has_stackmap_table() const {
     return constMethod()->has_stackmap_table();
   }
   Array<u1>* stackmap_data() const {
     return constMethod()->stackmap_data();
   }
   void set_stackmap_data(Array<u1>* sd) {
     constMethod()->set_stackmap_data(sd);
   }
   // exception handler table
   bool has_exception_handler() const
                              { return constMethod()->has_exception_handler(); }
   int exception_table_length() const
                              { return constMethod()->exception_table_length(); }
   ExceptionTableElement* exception_table_start() const
                              { return constMethod()->exception_table_start(); }
   // Finds the first entry point bci of an exception handler for an
   // exception of klass ex_klass thrown at throw_bci. A value of NULL
   // for ex_klass indicates that the exception klass is not known; in
   // this case it matches any constraint class. Returns -1 if the
   // exception cannot be handled in this method. The handler
   // constraint classes are loaded if necessary. Note that this may
   // throw an exception if loading of the constraint classes causes
   // an IllegalAccessError (bugid 4307310) or an OutOfMemoryError.
   // If an exception is thrown, returns the bci of the
   // exception handler which caused the exception to be thrown, which
   // is needed for proper retries. See, for example,
   // InterpreterRuntime::exception_handler_for_exception.
   static int fast_exception_handler_bci_for(methodHandle mh, KlassHandle ex_klass, int throw_bci, TRAPS);
   // method data access
   MethodData* method_data() const              {
     return _method_data;
   }
   void set_method_data(MethodData* data)       {
     // The store into method must be released. On platforms without
     // total store order (TSO) the reference may become visible before
     // the initialization of data otherwise.
     OrderAccess::release_store_ptr((volatile void *)&_method_data, data);
   }
   MethodCounters* method_counters() const {
     return _method_counters;
   }
   void set_method_counters(MethodCounters* counters) {
     // The store into method must be released. On platforms without
     // total store order (TSO) the reference may become visible before
     // the initialization of data otherwise.
     OrderAccess::release_store_ptr((volatile void *)&_method_counters, counters);
   }
 #ifdef TIERED
   // We are reusing interpreter_invocation_count as a holder for the previous event count!
   // We can do that since interpreter_invocation_count is not used in tiered.
   int prev_event_count() const                   {
     if (method_counters() == NULL) {
       return 0;
     } else {
       return method_counters()->interpreter_invocation_count();
     }
   }
   void set_prev_event_count(int count) {
     MethodCounters* mcs = method_counters();
     if (mcs != NULL) {
       mcs->set_interpreter_invocation_count(count);
     }
   }
   jlong prev_time() const                        {
     MethodCounters* mcs = method_counters();
     return mcs == NULL ? 0 : mcs->prev_time();
   }
   void set_prev_time(jlong time) {
     MethodCounters* mcs = method_counters();
     if (mcs != NULL) {
       mcs->set_prev_time(time);
     }
   }
   float rate() const                             {
     MethodCounters* mcs = method_counters();
     return mcs == NULL ? 0 : mcs->rate();
   }
   void set_rate(float rate) {
     MethodCounters* mcs = method_counters();
     if (mcs != NULL) {
       mcs->set_rate(rate);
     }
   }
 #endif
   int invocation_count();
   int backedge_count();
   bool was_executed_more_than(int n);
   bool was_never_executed()                      { return !was_executed_more_than(0); }
   static void build_interpreter_method_data(methodHandle method, TRAPS);
   static MethodCounters* build_method_counters(Method* m, TRAPS);
   int interpreter_invocation_count() {
     if (TieredCompilation) {
       return invocation_count();
     } else {
       MethodCounters* mcs = method_counters();
       return (mcs == NULL) ? 0 : mcs->interpreter_invocation_count();
     }
   }
   int increment_interpreter_invocation_count(TRAPS) {
     if (TieredCompilation) ShouldNotReachHere();
     MethodCounters* mcs = get_method_counters(CHECK_0);
     return (mcs == NULL) ? 0 : mcs->increment_interpreter_invocation_count();
   }
 #ifndef PRODUCT
   int  compiled_invocation_count() const         { return _compiled_invocation_count;  }
   void set_compiled_invocation_count(int count)  { _compiled_invocation_count = count; }
 #endif // not PRODUCT
   // Clear (non-shared space) pointers which could not be relevant
   // if this (shared) method were mapped into another JVM.
   void remove_unshareable_info();
   // nmethod/verified compiler entry
   address verified_code_entry();
   bool check_code() const;      // Not inline to avoid circular ref
   nmethod* volatile code() const                 { assert( check_code(), "" ); return (nmethod *)OrderAccess::load_ptr_acquire(&_code); }
   void clear_code();            // Clear out any compiled code
   static void set_code(methodHandle mh, nmethod* code);
   void set_adapter_entry(AdapterHandlerEntry* adapter) {  _adapter = adapter; }
   address get_i2c_entry();
   address get_c2i_entry();
   address get_c2i_unverified_entry();
   AdapterHandlerEntry* adapter() {  return _adapter; }
   // setup entry points
   void link_method(methodHandle method, TRAPS);
   // clear entry points. Used by sharing code
   void unlink_method();
   // vtable index
   enum VtableIndexFlag {
     // Valid vtable indexes are non-negative (>= 0).
     // These few negative values are used as sentinels.
     itable_index_max        = -10, // first itable index, growing downward
     pending_itable_index    = -9,  // itable index will be assigned
     invalid_vtable_index    = -4,  // distinct from any valid vtable index
     garbage_vtable_index    = -3,  // not yet linked; no vtable layout yet
     nonvirtual_vtable_index = -2   // there is no need for vtable dispatch
     // 6330203 Note:  Do not use -1, which was overloaded with many meanings.
   };
   DEBUG_ONLY(bool valid_vtable_index() const     { return _vtable_index >= nonvirtual_vtable_index; })
   bool has_vtable_index() const                  { return _vtable_index >= 0; }
   int  vtable_index() const                      { return _vtable_index; }
   void set_vtable_index(int index)               { _vtable_index = index; }
   DEBUG_ONLY(bool valid_itable_index() const     { return _vtable_index <= pending_itable_index; })
   bool has_itable_index() const                  { return _vtable_index <= itable_index_max; }
   int  itable_index() const                      { assert(valid_itable_index(), "");
                                                    return itable_index_max - _vtable_index; }
   void set_itable_index(int index)               { _vtable_index = itable_index_max - index; assert(valid_itable_index(), ""); }
   // interpreter entry
   address interpreter_entry() const              { return _i2i_entry; }
   // Only used when first initialize so we can set _i2i_entry and _from_interpreted_entry
   void set_interpreter_entry(address entry)      { _i2i_entry = entry;  _from_interpreted_entry = entry; }
   // native function (used for native methods only)
   enum {
     native_bind_event_is_interesting = true
   };
   address native_function() const                { return *(native_function_addr()); }
   address critical_native_function();
   // Must specify a real function (not NULL).
   // Use clear_native_function() to unregister.
   void set_native_function(address function, bool post_event_flag);
   bool has_native_function() const;
   void clear_native_function();
   // signature handler (used for native methods only)
   address signature_handler() const              { return *(signature_handler_addr()); }
   void set_signature_handler(address handler);
   // Interpreter oopmap support
   void mask_for(int bci, InterpreterOopMap* mask);
 #ifndef PRODUCT
   // operations on invocation counter
   void print_invocation_count();
 #endif
   // byte codes
   void    set_code(address code)      { return constMethod()->set_code(code); }
   address code_base() const           { return constMethod()->code_base(); }
   bool    contains(address bcp) const { return constMethod()->contains(bcp); }
   // prints byte codes
   void print_codes() const            { print_codes_on(tty); }
   void print_codes_on(outputStream* st) const                      PRODUCT_RETURN;
   void print_codes_on(int from, int to, outputStream* st) const    PRODUCT_RETURN;
   // method parameters
   bool has_method_parameters() const
                          { return constMethod()->has_method_parameters(); }
   int method_parameters_length() const
                          { return constMethod()->method_parameters_length(); }
   MethodParametersElement* method_parameters_start() const
                           { return constMethod()->method_parameters_start(); }
   // checked exceptions
   int checked_exceptions_length() const
                          { return constMethod()->checked_exceptions_length(); }
   CheckedExceptionElement* checked_exceptions_start() const
                           { return constMethod()->checked_exceptions_start(); }
   // localvariable table
   bool has_localvariable_table() const
                           { return constMethod()->has_localvariable_table(); }
   int localvariable_table_length() const
                         { return constMethod()->localvariable_table_length(); }
   LocalVariableTableElement* localvariable_table_start() const
                          { return constMethod()->localvariable_table_start(); }
   bool has_linenumber_table() const
                               { return constMethod()->has_linenumber_table(); }
   u_char* compressed_linenumber_table() const
                        { return constMethod()->compressed_linenumber_table(); }
   // method holder (the Klass* holding this method)
   InstanceKlass* method_holder() const         { return constants()->pool_holder(); }
   void compute_size_of_parameters(Thread *thread); // word size of parameters (receiver if any + arguments)
   Symbol* klass_name() const;                    // returns the name of the method holder
   BasicType result_type() const;                 // type of the method result
   int result_type_index() const;                 // type index of the method result
   bool is_returning_oop() const                  { BasicType r = result_type(); return (r == T_OBJECT || r == T_ARRAY); }
   bool is_returning_fp() const                   { BasicType r = result_type(); return (r == T_FLOAT || r == T_DOUBLE); }
   // Checked exceptions thrown by this method (resolved to mirrors)
   objArrayHandle resolved_checked_exceptions(TRAPS) { return resolved_checked_exceptions_impl(this, THREAD); }
   // Access flags
   bool is_public() const                         { return access_flags().is_public();      }
   bool is_private() const                        { return access_flags().is_private();     }
   bool is_protected() const                      { return access_flags().is_protected();   }
   bool is_package_private() const                { return !is_public() && !is_private() && !is_protected(); }
   bool is_static() const                         { return access_flags().is_static();      }
   bool is_final() const                          { return access_flags().is_final();       }
   bool is_synchronized() const                   { return access_flags().is_synchronized();}
   bool is_native() const                         { return access_flags().is_native();      }
   bool is_abstract() const                       { return access_flags().is_abstract();    }
   bool is_strict() const                         { return access_flags().is_strict();      }
   bool is_synthetic() const                      { return access_flags().is_synthetic();   }
   // returns true if contains only return operation
   bool is_empty_method() const;
   // returns true if this is a vanilla constructor
   bool is_vanilla_constructor() const;
   // checks method and its method holder
   bool is_final_method() const;
   bool is_final_method(AccessFlags class_access_flags) const;
   bool is_default_method() const;
   // true if method needs no dynamic dispatch (final and/or no vtable entry)
   bool can_be_statically_bound() const;
   bool can_be_statically_bound(AccessFlags class_access_flags) const;
   // returns true if the method has any backward branches.
   bool has_loops() {
     return access_flags().loops_flag_init() ? access_flags().has_loops() : compute_has_loops_flag();
   };
   bool compute_has_loops_flag();
   bool has_jsrs() {
     return access_flags().has_jsrs();
   };
   void set_has_jsrs() {
     _access_flags.set_has_jsrs();
   }
   // returns true if the method has any monitors.
   bool has_monitors() const                      { return is_synchronized() || access_flags().has_monitor_bytecodes(); }
   bool has_monitor_bytecodes() const             { return access_flags().has_monitor_bytecodes(); }
   void set_has_monitor_bytecodes()               { _access_flags.set_has_monitor_bytecodes(); }
   // monitor matching. This returns a conservative estimate of whether the monitorenter/monitorexit bytecodes
   // propererly nest in the method. It might return false, even though they actually nest properly, since the info.
   // has not been computed yet.
   bool guaranteed_monitor_matching() const       { return access_flags().is_monitor_matching(); }
   void set_guaranteed_monitor_matching()         { _access_flags.set_monitor_matching(); }
   // returns true if the method is an accessor function (setter/getter).
   bool is_accessor() const;
   // returns true if the method is an initializer (<init> or <clinit>).
   bool is_initializer() const;
   // returns true if the method is static OR if the classfile version < 51
   bool has_valid_initializer_flags() const;
   // returns true if the method name is <clinit> and the method has
   // valid static initializer flags.
   bool is_static_initializer() const;
   // compiled code support
   // NOTE: code() is inherently racy as deopt can be clearing code
   // simultaneously. Use with caution.
   bool has_compiled_code() const                 { return code() != NULL; }
   // sizing
   static int header_size()                       { return sizeof(Method)/HeapWordSize; }
   static int size(bool is_native);
   int size() const                               { return method_size(); }
 #if INCLUDE_SERVICES
   void collect_statistics(KlassSizeStats *sz) const;
 #endif
   // interpreter support
   static ByteSize const_offset()                 { return byte_offset_of(Method, _constMethod       ); }
   static ByteSize access_flags_offset()          { return byte_offset_of(Method, _access_flags      ); }
 #ifdef CC_INTERP
   static ByteSize result_index_offset()          { return byte_offset_of(Method, _result_index ); }
 #endif /* CC_INTERP */
   static ByteSize from_compiled_offset()         { return byte_offset_of(Method, _from_compiled_entry); }
   static ByteSize code_offset()                  { return byte_offset_of(Method, _code); }
   static ByteSize method_data_offset()           {
     return byte_offset_of(Method, _method_data);
   }
   static ByteSize method_counters_offset()       {
     return byte_offset_of(Method, _method_counters);
   }
 #ifndef PRODUCT
   static ByteSize compiled_invocation_counter_offset() { return byte_offset_of(Method, _compiled_invocation_count); }
 #endif // not PRODUCT
   static ByteSize native_function_offset()       { return in_ByteSize(sizeof(Method));                 }
   static ByteSize from_interpreted_offset()      { return byte_offset_of(Method, _from_interpreted_entry ); }
   static ByteSize interpreter_entry_offset()     { return byte_offset_of(Method, _i2i_entry ); }
   static ByteSize signature_handler_offset()     { return in_ByteSize(sizeof(Method) + wordSize);      }
   // for code generation
   static int method_data_offset_in_bytes()       { return offset_of(Method, _method_data); }
   static int intrinsic_id_offset_in_bytes()      { return offset_of(Method, _intrinsic_id); }
   static int intrinsic_id_size_in_bytes()        { return sizeof(u1); }
   // Static methods that are used to implement member methods where an exposed this pointer
   // is needed due to possible GCs
   static objArrayHandle resolved_checked_exceptions_impl(Method* this_oop, TRAPS);
   // Returns the byte code index from the byte code pointer
   int     bci_from(address bcp) const;
   address bcp_from(int     bci) const;
   int validate_bci_from_bcx(intptr_t bcx) const;
   // Returns the line number for a bci if debugging information for the method is prowided,
   // -1 is returned otherwise.
   int line_number_from_bci(int bci) const;
   // Reflection support
   bool is_overridden_in(Klass* k) const;
   // Stack walking support
   bool is_ignored_by_security_stack_walk() const;
   // JSR 292 support
   bool is_method_handle_intrinsic() const;          // MethodHandles::is_signature_polymorphic_intrinsic(intrinsic_id)
   bool is_compiled_lambda_form() const;             // intrinsic_id() == vmIntrinsics::_compiledLambdaForm
   bool has_member_arg() const;                      // intrinsic_id() == vmIntrinsics::_linkToSpecial, etc.
   static methodHandle make_method_handle_intrinsic(vmIntrinsics::ID iid, // _invokeBasic, _linkToVirtual
                                                    Symbol* signature, //anything at all
                                                    TRAPS);
   static Klass* check_non_bcp_klass(Klass* klass);
   // How many extra stack entries for invokedynamic when it's enabled
   static const int extra_stack_entries_for_jsr292 = 1;
   // this operates only on invoke methods:
   // presize interpreter frames for extra interpreter stack entries, if needed
   // Account for the extra appendix argument for invokehandle/invokedynamic
   static int extra_stack_entries() { return EnableInvokeDynamic ? extra_stack_entries_for_jsr292 : 0; }
   static int extra_stack_words();  // = extra_stack_entries() * Interpreter::stackElementSize
   // RedefineClasses() support:
   bool is_old() const                               { return access_flags().is_old(); }
   void set_is_old()                                 { _access_flags.set_is_old(); }
   bool is_obsolete() const                          { return access_flags().is_obsolete(); }
   void set_is_obsolete()                            { _access_flags.set_is_obsolete(); }
   bool on_stack() const                             { return access_flags().on_stack(); }
   void set_on_stack(const bool value);
   // see the definition in Method*.cpp for the gory details
   bool should_not_be_cached() const;
   // JVMTI Native method prefixing support:
   bool is_prefixed_native() const                   { return access_flags().is_prefixed_native(); }
   void set_is_prefixed_native()                     { _access_flags.set_is_prefixed_native(); }
   // Rewriting support
   static methodHandle clone_with_new_data(methodHandle m, u_char* new_code, int new_code_length,
                                           u_char* new_compressed_linenumber_table, int new_compressed_linenumber_size, TRAPS);
   // jmethodID handling
   // Because the useful life-span of a jmethodID cannot be determined,
   // once created they are never reclaimed.  The methods to which they refer,
   // however, can be GC'ed away if the class is unloaded or if the method is
   // made obsolete or deleted -- in these cases, the jmethodID
   // refers to NULL (as is the case for any weak reference).
   static jmethodID make_jmethod_id(ClassLoaderData* loader_data, Method* mh);
   static void destroy_jmethod_id(ClassLoaderData* loader_data, jmethodID mid);
   // Use resolve_jmethod_id() in situations where the caller is expected
   // to provide a valid jmethodID; the only sanity checks are in asserts;
   // result guaranteed not to be NULL.
   inline static Method* resolve_jmethod_id(jmethodID mid) {
     assert(mid != NULL, "JNI method id should not be null");
     return *((Method**)mid);
   }
   // Use checked_resolve_jmethod_id() in situations where the caller
   // should provide a valid jmethodID, but might not. NULL is returned
   // when the jmethodID does not refer to a valid method.
   static Method* checked_resolve_jmethod_id(jmethodID mid);
   static void change_method_associated_with_jmethod_id(jmethodID old_jmid_ptr, Method* new_method);
   static bool is_method_id(jmethodID mid);
   // Clear methods
   static void clear_jmethod_ids(ClassLoaderData* loader_data);
   static void print_jmethod_ids(ClassLoaderData* loader_data, outputStream* out) PRODUCT_RETURN;
   // Get this method's jmethodID -- allocate if it doesn't exist
   jmethodID jmethod_id()                            { methodHandle this_h(this);
                                                       return InstanceKlass::get_jmethod_id(method_holder(), this_h); }
   // Lookup the jmethodID for this method.  Return NULL if not found.
   // NOTE that this function can be called from a signal handler
   // (see AsyncGetCallTrace support for Forte Analyzer) and this
   // needs to be async-safe. No allocation should be done and
   // so handles are not used to avoid deadlock.
   jmethodID find_jmethod_id_or_null()               { return method_holder()->jmethod_id_or_null(this); }
   // Support for inlining of intrinsic methods
   vmIntrinsics::ID intrinsic_id() const          { return (vmIntrinsics::ID) _intrinsic_id;           }
   void     set_intrinsic_id(vmIntrinsics::ID id) {                           _intrinsic_id = (u1) id; }
   // Helper routines for intrinsic_id() and vmIntrinsics::method().
   void init_intrinsic_id();     // updates from _none if a match
   static vmSymbols::SID klass_id_for_intrinsics(Klass* holder);
   bool     jfr_towrite()            { return _jfr_towrite;          }
   void set_jfr_towrite(bool x)      {        _jfr_towrite = x;      }
   bool     caller_sensitive()       { return _caller_sensitive;     }
   void set_caller_sensitive(bool x) {        _caller_sensitive = x; }
   bool     force_inline()           { return _force_inline;         }
   void set_force_inline(bool x)     {        _force_inline = x;     }
   bool     dont_inline()            { return _dont_inline;          }
   void set_dont_inline(bool x)      {        _dont_inline = x;      }
   bool  is_hidden()                 { return _hidden;               }
   void set_hidden(bool x)           {        _hidden = x;           }
   ConstMethod::MethodType method_type() const {
       return _constMethod->method_type();
   }
   bool is_overpass() const { return method_type() == ConstMethod::OVERPASS; }
   // On-stack replacement support
   bool has_osr_nmethod(int level, bool match_level) {
    return method_holder()->lookup_osr_nmethod(this, InvocationEntryBci, level, match_level) != NULL;
   }
   nmethod* lookup_osr_nmethod_for(int bci, int level, bool match_level) {
     return method_holder()->lookup_osr_nmethod(this, bci, level, match_level);
   }
   // Inline cache support
   void cleanup_inline_caches();
   // Find if klass for method is loaded
   bool is_klass_loaded_by_klass_index(int klass_index) const;
   bool is_klass_loaded(int refinfo_index, bool must_be_resolved = false) const;
   // Indicates whether compilation failed earlier for this method, or
   // whether it is not compilable for another reason like having a
   // breakpoint set in it.
   bool  is_not_compilable(int comp_level = CompLevel_any) const;
   void set_not_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
   void set_not_compilable_quietly(int comp_level = CompLevel_all) {
     set_not_compilable(comp_level, false);
   }
   bool  is_not_osr_compilable(int comp_level = CompLevel_any) const;
   void set_not_osr_compilable(int comp_level = CompLevel_all, bool report = true, const char* reason = NULL);
   void set_not_osr_compilable_quietly(int comp_level = CompLevel_all) {
     set_not_osr_compilable(comp_level, false);
   }
   bool is_always_compilable() const;
  private:
   void print_made_not_compilable(int comp_level, bool is_osr, bool report, const char* reason);
  public:
   MethodCounters* get_method_counters(TRAPS) {
     if (_method_counters == NULL) {
       build_method_counters(this, CHECK_AND_CLEAR_NULL);
     }
     return _method_counters;
   }
   bool   is_not_c1_compilable() const         { return access_flags().is_not_c1_compilable();  }
   void  set_not_c1_compilable()               {       _access_flags.set_not_c1_compilable();   }
   void clear_not_c1_compilable()              {       _access_flags.clear_not_c1_compilable(); }
   bool   is_not_c2_compilable() const         { return access_flags().is_not_c2_compilable();  }
   void  set_not_c2_compilable()               {       _access_flags.set_not_c2_compilable();   }
   void clear_not_c2_compilable()              {       _access_flags.clear_not_c2_compilable(); }
   bool    is_not_c1_osr_compilable() const    { return is_not_c1_compilable(); }  // don't waste an accessFlags bit
   void   set_not_c1_osr_compilable()          {       set_not_c1_compilable(); }  // don't waste an accessFlags bit
   void clear_not_c1_osr_compilable()          {     clear_not_c1_compilable(); }  // don't waste an accessFlags bit
   bool   is_not_c2_osr_compilable() const     { return access_flags().is_not_c2_osr_compilable();  }
   void  set_not_c2_osr_compilable()           {       _access_flags.set_not_c2_osr_compilable();   }
   void clear_not_c2_osr_compilable()          {       _access_flags.clear_not_c2_osr_compilable(); }
   // Background compilation support
   bool queued_for_compilation() const  { return access_flags().queued_for_compilation(); }
   void set_queued_for_compilation()    { _access_flags.set_queued_for_compilation();     }
   void clear_queued_for_compilation()  { _access_flags.clear_queued_for_compilation();   }
   // Resolve all classes in signature, return 'true' if successful
   static bool load_signature_classes(methodHandle m, TRAPS);
   // Return if true if not all classes references in signature, including return type, has been loaded
   static bool has_unloaded_classes_in_signature(methodHandle m, TRAPS);
   // Printing
   void print_short_name(outputStream* st = tty); // prints as klassname::methodname; Exposed so field engineers can debug VM
 #if INCLUDE_JVMTI
   void print_name(outputStream* st = tty); // prints as "virtual void foo(int)"; exposed for TraceRedefineClasses
 #else
   void print_name(outputStream* st = tty)        PRODUCT_RETURN; // prints as "virtual void foo(int)"
 #endif
   // Helper routine used for method sorting
   static void sort_methods(Array<Method*>* methods, bool idempotent = false, bool set_idnums = true);
   // Deallocation function for redefine classes or if an error occurs
   void deallocate_contents(ClassLoaderData* loader_data);
   // Printing
 #ifndef PRODUCT
   void print_on(outputStream* st) const;
 #endif
   void print_value_on(outputStream* st) const;
   const char* internal_name() const { return "{method}"; }
   // Check for valid method pointer
   static bool has_method_vptr(const void* ptr);
   bool is_valid_method() const;
   // Verify
   void verify() { verify_on(tty); }
   void verify_on(outputStream* st);
  private:
   // Inlined elements
   address* native_function_addr() const          { assert(is_native(), "must be native"); return (address*) (this+1); }
   address* signature_handler_addr() const        { return native_function_addr() + 1; }
 };
 // Utility class for compressing line number tables
 class CompressedLineNumberWriteStream: public CompressedWriteStream {
  private:
   int _bci;
   int _line;
  public:
   // Constructor
   CompressedLineNumberWriteStream(int initial_size) : CompressedWriteStream(initial_size), _bci(0), _line(0) {}
   CompressedLineNumberWriteStream(u_char* buffer, int initial_size) : CompressedWriteStream(buffer, initial_size), _bci(0), _line(0) {}
   // Write (bci, line number) pair to stream
   void write_pair_regular(int bci_delta, int line_delta);
   inline void write_pair_inline(int bci, int line) {
     int bci_delta = bci - _bci;
     int line_delta = line - _line;
     _bci = bci;
     _line = line;
     // Skip (0,0) deltas - they do not add information and conflict with terminator.
     if (bci_delta == 0 && line_delta == 0) return;
     // Check if bci is 5-bit and line number 3-bit unsigned.
     if (((bci_delta & ~0x1F) == 0) && ((line_delta & ~0x7) == 0)) {
       // Compress into single byte.
       jubyte value = ((jubyte) bci_delta << 3) | (jubyte) line_delta;
       // Check that value doesn't match escape character.
       if (value != 0xFF) {
         write_byte(value);
         return;
       }
     }
     write_pair_regular(bci_delta, line_delta);
   }
 // Windows AMD64 + Apr 2005 PSDK with /O2 generates bad code for write_pair.
 // Disabling optimization doesn't work for methods in header files
 // so we force it to call through the non-optimized version in the .cpp.
 // It's gross, but it's the only way we can ensure that all callers are
 // fixed.  _MSC_VER is defined by the windows compiler
 #if defined(_M_AMD64) && _MSC_VER >= 1400
   void write_pair(int bci, int line);
 #else
   void write_pair(int bci, int line) { write_pair_inline(bci, line); }
 #endif
   // Write end-of-stream marker
   void write_terminator()                        { write_byte(0); }
 };
 // Utility class for decompressing line number tables
 class CompressedLineNumberReadStream: public CompressedReadStream {
  private:
   int _bci;
   int _line;
  public:
   // Constructor
   CompressedLineNumberReadStream(u_char* buffer);
   // Read (bci, line number) pair from stream. Returns false at end-of-stream.
   bool read_pair();
   // Accessing bci and line number (after calling read_pair)
   int bci() const                               { return _bci; }
   int line() const                              { return _line; }
 };
 /// Fast Breakpoints.
 // If this structure gets more complicated (because bpts get numerous),
 // move it into its own header.
 // There is presently no provision for concurrent access
 // to breakpoint lists, which is only OK for JVMTI because
 // breakpoints are written only at safepoints, and are read
 // concurrently only outside of safepoints.
 class BreakpointInfo : public CHeapObj<mtClass> {
   friend class VMStructs;
  private:
   Bytecodes::Code  _orig_bytecode;
   int              _bci;
   u2               _name_index;       // of method
   u2               _signature_index;  // of method
   BreakpointInfo*  _next;             // simple storage allocation
  public:
   BreakpointInfo(Method* m, int bci);
   // accessors
   Bytecodes::Code orig_bytecode()                     { return _orig_bytecode; }
   void        set_orig_bytecode(Bytecodes::Code code) { _orig_bytecode = code; }
   int         bci()                                   { return _bci; }
   BreakpointInfo*          next() const               { return _next; }
   void                 set_next(BreakpointInfo* n)    { _next = n; }
   // helps for searchers
   bool match(const Method* m, int bci) {
     return bci == _bci && match(m);
   }
   bool match(const Method* m) {
     return _name_index == m->name_index() &&
       _signature_index == m->signature_index();
   }
   void set(Method* method);
   void clear(Method* method);
 };
 // Utility class for access exception handlers
 class ExceptionTable : public StackObj {
  private:
   ExceptionTableElement* _table;
   u2  _length;
  public:
   ExceptionTable(const Method* m) {
     if (m->has_exception_handler()) {
       _table = m->exception_table_start();
       _length = m->exception_table_length();
     } else {
       _table = NULL;
       _length = 0;
     }
   }
   int length() const {
     return _length;
   }
   u2 start_pc(int idx) const {
     assert(idx < _length, "out of bounds");
     return _table[idx].start_pc;
   }
   void set_start_pc(int idx, u2 value) {
     assert(idx < _length, "out of bounds");
     _table[idx].start_pc = value;
   }
   u2 end_pc(int idx) const {
     assert(idx < _length, "out of bounds");
     return _table[idx].end_pc;
   }
   void set_end_pc(int idx, u2 value) {
     assert(idx < _length, "out of bounds");
     _table[idx].end_pc = value;
   }
   u2 handler_pc(int idx) const {
     assert(idx < _length, "out of bounds");
     return _table[idx].handler_pc;
   }
   void set_handler_pc(int idx, u2 value) {
     assert(idx < _length, "out of bounds");
     _table[idx].handler_pc = value;
   }
   u2 catch_type_index(int idx) const {
     assert(idx < _length, "out of bounds");
     return _table[idx].catch_type_index;
   }
   void set_catch_type_index(int idx, u2 value) {
     assert(idx < _length, "out of bounds");
     _table[idx].catch_type_index = value;
   }
 };
 #endif // SHARE_VM_OOPS_METHODOOP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/method.hpp@7301840ea20e (annotated)

src/share/vm/oops/method.hpp