jdk8-mips64-public/hotspot: src/share/vm/oops/cpCache.hpp@f8a45a60bc6b (annotated)

src/share/vm/oops/cpCache.hpp@f8a45a60bc6b (annotated)

src/share/vm/oops/cpCache.hpp

Fri, 29 Sep 2017 14:30:05 -0400

author: dbuck
date: Fri, 29 Sep 2017 14:30:05 -0400
changeset 8997: f8a45a60bc6b
parent 8739: 0b85ccd62409
child 9041: 95a08233f46c
permissions: -rw-r--r--

8174962: Better interface invocations
Reviewed-by: jrose, coleenp, ahgross, acorn, vlivanov

 /*
  * Copyright (c) 1998, 2017, 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_CPCACHEOOP_HPP
 #define SHARE_VM_OOPS_CPCACHEOOP_HPP
 #include "interpreter/bytecodes.hpp"
 #include "memory/allocation.hpp"
 #include "runtime/orderAccess.hpp"
 #include "utilities/array.hpp"
 class PSPromotionManager;
 // The ConstantPoolCache is not a cache! It is the resolution table that the
 // interpreter uses to avoid going into the runtime and a way to access resolved
 // values.
 // A ConstantPoolCacheEntry describes an individual entry of the constant
 // pool cache. There's 2 principal kinds of entries: field entries for in-
 // stance & static field access, and method entries for invokes. Some of
 // the entry layout is shared and looks as follows:
 //
 // bit number |31                0|
 // bit length |-8--|-8--|---16----|
 // --------------------------------
 // _indices   [ b2 | b1 |  index  ]  index = constant_pool_index
 // _f1        [  entry specific   ]  metadata ptr (method or klass)
 // _f2        [  entry specific   ]  vtable or res_ref index, or vfinal method ptr
 // _flags     [tos|0|F=1|0|0|0|f|v|0 |0000|field_index] (for field entries)
 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|----16-----]
 // _flags     [tos|0|F=0|M|A|I|f|0|vf|0000|00000|psize] (for method entries)
 // bit length [ 4 |1| 1 |1|1|1|1|1|1 |-4--|--8--|--8--]
 // --------------------------------
 //
 // with:
 // index  = original constant pool index
 // b1     = bytecode 1
 // b2     = bytecode 2
 // psize  = parameters size (method entries only)
 // field_index = index into field information in holder InstanceKlass
 //          The index max is 0xffff (max number of fields in constant pool)
 //          and is multiplied by (InstanceKlass::next_offset) when accessing.
 // tos    = TosState
 // F      = the entry is for a field (or F=0 for a method)
 // A      = call site has an appendix argument (loaded from resolved references)
 // I      = interface call is forced virtual (must use a vtable index or vfinal)
 // f      = field or method is final
 // v      = field is volatile
 // vf     = virtual but final (method entries only: is_vfinal())
 //
 // The flags after TosState have the following interpretation:
 // bit 27: 0 for fields, 1 for methods
 // f  flag true if field is marked final
 // v  flag true if field is volatile (only for fields)
 // f2 flag true if f2 contains an oop (e.g., virtual final method)
 // fv flag true if invokeinterface used for method in class Object
 //
 // The flags 31, 30, 29, 28 together build a 4 bit number 0 to 16 with the
 // following mapping to the TosState states:
 //
 // btos: 0
 // ztos: 1
 // ctos: 2
 // stos: 3
 // itos: 4
 // ltos: 5
 // ftos: 6
 // dtos: 7
 // atos: 8
 // vtos: 9
 //
 // Entry specific: field entries:
 // _indices = get (b1 section) and put (b2 section) bytecodes, original constant pool index
 // _f1      = field holder (as a java.lang.Class, not a Klass*)
 // _f2      = field offset in bytes
 // _flags   = field type information, original FieldInfo index in field holder
 //            (field_index section)
 //
 // Entry specific: method entries:
 // _indices = invoke code for f1 (b1 section), invoke code for f2 (b2 section),
 //            original constant pool index
 // _f1      = Method* for non-virtual calls, unused by virtual calls.
 //            for interface calls, which are essentially virtual but need a klass,
 //            contains Klass* for the corresponding interface.
 //            for invokedynamic, f1 contains a site-specific CallSite object (as an appendix)
 //            for invokehandle, f1 contains a site-specific MethodType object (as an appendix)
 //            (upcoming metadata changes will move the appendix to a separate array)
 // _f2      = vtable/itable index (or final Method*) for virtual calls only,
 //            unused by non-virtual.  The is_vfinal flag indicates this is a
 //            method pointer for a final method, not an index.
 // _flags   = method type info (t section),
 //            virtual final bit (vfinal),
 //            parameter size (psize section)
 //
 // Note: invokevirtual & invokespecial bytecodes can share the same constant
 //       pool entry and thus the same constant pool cache entry. All invoke
 //       bytecodes but invokevirtual use only _f1 and the corresponding b1
 //       bytecode, while invokevirtual uses only _f2 and the corresponding
 //       b2 bytecode.  The value of _flags is shared for both types of entries.
 //
 // The fields are volatile so that they are stored in the order written in the
 // source code.  The _indices field with the bytecode must be written last.
 class CallInfo;
 class ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
   friend class constantPoolCacheKlass;
   friend class ConstantPool;
   friend class InterpreterRuntime;
  private:
   volatile intx     _indices;  // constant pool index & rewrite bytecodes
   volatile Metadata*   _f1;       // entry specific metadata field
   volatile intx        _f2;       // entry specific int/metadata field
   volatile intx     _flags;    // flags
   void set_bytecode_1(Bytecodes::Code code);
   void set_bytecode_2(Bytecodes::Code code);
   void set_f1(Metadata* f1) {
     Metadata* existing_f1 = (Metadata*)_f1; // read once
     assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
     _f1 = f1;
   }
   void release_set_f1(Metadata* f1);
   void set_f2(intx f2) {
     intx existing_f2 = _f2; // read once
     assert(existing_f2 == 0 || existing_f2 == f2, "illegal field change");
     _f2 = f2;
   }
   void set_f2_as_vfinal_method(Method* f2) {
     assert(is_vfinal(), "flags must be set");
     set_f2((intx)f2);
   }
   int make_flags(TosState state, int option_bits, int field_index_or_method_params);
   void set_flags(intx flags)                     { _flags = flags; }
   bool init_flags_atomic(intx flags);
   void set_field_flags(TosState field_type, int option_bits, int field_index) {
     assert((field_index & field_index_mask) == field_index, "field_index in range");
     set_flags(make_flags(field_type, option_bits | (1 << is_field_entry_shift), field_index));
   }
   void set_method_flags(TosState return_type, int option_bits, int method_params) {
     assert((method_params & parameter_size_mask) == method_params, "method_params in range");
     set_flags(make_flags(return_type, option_bits, method_params));
   }
   bool init_method_flags_atomic(TosState return_type, int option_bits, int method_params) {
     assert((method_params & parameter_size_mask) == method_params, "method_params in range");
     return init_flags_atomic(make_flags(return_type, option_bits, method_params));
   }
  public:
   // specific bit definitions for the flags field:
   // (Note: the interpreter must use these definitions to access the CP cache.)
   enum {
     // high order bits are the TosState corresponding to field type or method return type
     tos_state_bits             = 4,
     tos_state_mask             = right_n_bits(tos_state_bits),
     tos_state_shift            = BitsPerInt - tos_state_bits,  // see verify_tos_state_shift below
     // misc. option bits; can be any bit position in [16..27]
     is_field_entry_shift       = 26,  // (F) is it a field or a method?
     has_method_type_shift      = 25,  // (M) does the call site have a MethodType?
     has_appendix_shift         = 24,  // (A) does the call site have an appendix argument?
     is_forced_virtual_shift    = 23,  // (I) is the interface reference forced to virtual mode?
     is_final_shift             = 22,  // (f) is the field or method final?
     is_volatile_shift          = 21,  // (v) is the field volatile?
     is_vfinal_shift            = 20,  // (vf) did the call resolve to a final method?
     // low order bits give field index (for FieldInfo) or method parameter size:
     field_index_bits           = 16,
     field_index_mask           = right_n_bits(field_index_bits),
     parameter_size_bits        = 8,  // subset of field_index_mask, range is 0..255
     parameter_size_mask        = right_n_bits(parameter_size_bits),
     option_bits_mask           = ~(((-1) << tos_state_shift) | (field_index_mask | parameter_size_mask))
   };
   // specific bit definitions for the indices field:
   enum {
     cp_index_bits              = 2*BitsPerByte,
     cp_index_mask              = right_n_bits(cp_index_bits),
     bytecode_1_shift           = cp_index_bits,
     bytecode_1_mask            = right_n_bits(BitsPerByte), // == (u1)0xFF
     bytecode_2_shift           = cp_index_bits + BitsPerByte,
     bytecode_2_mask            = right_n_bits(BitsPerByte)  // == (u1)0xFF
   };
   // Initialization
   void initialize_entry(int original_index);     // initialize primary entry
   void initialize_resolved_reference_index(int ref_index) {
     assert(_f2 == 0, "set once");  // note: ref_index might be zero also
     _f2 = ref_index;
   }
   void set_field(                                // sets entry to resolved field state
     Bytecodes::Code get_code,                    // the bytecode used for reading the field
     Bytecodes::Code put_code,                    // the bytecode used for writing the field
     KlassHandle     field_holder,                // the object/klass holding the field
     int             orig_field_index,            // the original field index in the field holder
     int             field_offset,                // the field offset in words in the field holder
     TosState        field_type,                  // the (machine) field type
     bool            is_final,                     // the field is final
     bool            is_volatile,                 // the field is volatile
     Klass*          root_klass                   // needed by the GC to dirty the klass
   );
  private:
   void set_direct_or_vtable_call(
     Bytecodes::Code invoke_code,                 // the bytecode used for invoking the method
     methodHandle    method,                      // the method/prototype if any (NULL, otherwise)
     int             vtable_index,                // the vtable index if any, else negative
     bool            sender_is_interface
   );
  public:
   void set_direct_call(                          // sets entry to exact concrete method entry
     Bytecodes::Code invoke_code,                 // the bytecode used for invoking the method
     methodHandle    method,                      // the method to call
     bool            sender_is_interface
   );
   void set_vtable_call(                          // sets entry to vtable index
     Bytecodes::Code invoke_code,                 // the bytecode used for invoking the method
     methodHandle    method,                      // resolved method which declares the vtable index
     int             vtable_index                 // the vtable index
   );
   void set_itable_call(
     Bytecodes::Code invoke_code,                 // the bytecode used; must be invokeinterface
     KlassHandle referenced_klass,                // the referenced klass in the InterfaceMethodref
     methodHandle method,                         // the resolved interface method
     int itable_index                             // index into itable for the method
   );
   void set_method_handle(
     constantPoolHandle cpool,                    // holding constant pool (required for locking)
     const CallInfo &call_info                    // Call link information
   );
   void set_dynamic_call(
     constantPoolHandle cpool,                    // holding constant pool (required for locking)
     const CallInfo &call_info                    // Call link information
   );
   // Common code for invokedynamic and MH invocations.
   // The "appendix" is an optional call-site-specific parameter which is
   // pushed by the JVM at the end of the argument list.  This argument may
   // be a MethodType for the MH.invokes and a CallSite for an invokedynamic
   // instruction.  However, its exact type and use depends on the Java upcall,
   // which simply returns a compiled LambdaForm along with any reference
   // that LambdaForm needs to complete the call.  If the upcall returns a
   // null appendix, the argument is not passed at all.
   //
   // The appendix is *not* represented in the signature of the symbolic
   // reference for the call site, but (if present) it *is* represented in
   // the Method* bound to the site.  This means that static and dynamic
   // resolution logic needs to make slightly different assessments about the
   // number and types of arguments.
   void set_method_handle_common(
     constantPoolHandle cpool,                    // holding constant pool (required for locking)
     Bytecodes::Code invoke_code,                 // _invokehandle or _invokedynamic
     const CallInfo &call_info                    // Call link information
   );
   // invokedynamic and invokehandle call sites have two entries in the
   // resolved references array:
   //   appendix   (at index+0)
   //   MethodType (at index+1)
   enum {
     _indy_resolved_references_appendix_offset    = 0,
     _indy_resolved_references_method_type_offset = 1,
     _indy_resolved_references_entries
   };
   Method*      method_if_resolved(constantPoolHandle cpool);
   oop        appendix_if_resolved(constantPoolHandle cpool);
   oop     method_type_if_resolved(constantPoolHandle cpool);
   void set_parameter_size(int value);
   // Which bytecode number (1 or 2) in the index field is valid for this bytecode?
   // Returns -1 if neither is valid.
   static int bytecode_number(Bytecodes::Code code) {
     switch (code) {
       case Bytecodes::_getstatic       :    // fall through
       case Bytecodes::_getfield        :    // fall through
       case Bytecodes::_invokespecial   :    // fall through
       case Bytecodes::_invokestatic    :    // fall through
       case Bytecodes::_invokehandle    :    // fall through
       case Bytecodes::_invokedynamic   :    // fall through
       case Bytecodes::_invokeinterface : return 1;
       case Bytecodes::_putstatic       :    // fall through
       case Bytecodes::_putfield        :    // fall through
       case Bytecodes::_invokevirtual   : return 2;
       default                          : break;
     }
     return -1;
   }
   // Has this bytecode been resolved? Only valid for invokes and get/put field/static.
   bool is_resolved(Bytecodes::Code code) const {
     switch (bytecode_number(code)) {
       case 1:  return (bytecode_1() == code);
       case 2:  return (bytecode_2() == code);
     }
     return false;      // default: not resolved
   }
   // Accessors
   int indices() const                            { return _indices; }
   int indices_ord() const                        { return (intx)OrderAccess::load_ptr_acquire(&_indices); }
   int constant_pool_index() const                { return (indices() & cp_index_mask); }
   Bytecodes::Code bytecode_1() const             { return Bytecodes::cast((indices_ord() >> bytecode_1_shift) & bytecode_1_mask); }
   Bytecodes::Code bytecode_2() const             { return Bytecodes::cast((indices_ord() >> bytecode_2_shift) & bytecode_2_mask); }
   Metadata* f1_ord() const                       { return (Metadata *)OrderAccess::load_ptr_acquire(&_f1); }
   Method*   f1_as_method() const                 { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_method(), ""); return (Method*)f1; }
   Klass*    f1_as_klass() const                  { Metadata* f1 = f1_ord(); assert(f1 == NULL || f1->is_klass(), ""); return (Klass*)f1; }
   // Use the accessor f1() to acquire _f1's value. This is needed for
   // example in BytecodeInterpreter::run(), where is_f1_null() is
   // called to check if an invokedynamic call is resolved. This load
   // of _f1 must be ordered with the loads performed by
   // cache->main_entry_index().
   bool      is_f1_null() const                   { Metadata* f1 = f1_ord(); return f1 == NULL; }  // classifies a CPC entry as unbound
   int       f2_as_index() const                  { assert(!is_vfinal(), ""); return (int) _f2; }
   Method*   f2_as_vfinal_method() const          { assert(is_vfinal(), ""); return (Method*)_f2; }
   Method*   f2_as_interface_method() const       { assert(bytecode_1() == Bytecodes::_invokeinterface, ""); return (Method*)_f2; }
   int  field_index() const                       { assert(is_field_entry(),  ""); return (_flags & field_index_mask); }
   int  parameter_size() const                    { assert(is_method_entry(), ""); return (_flags & parameter_size_mask); }
   bool is_volatile() const                       { return (_flags & (1 << is_volatile_shift))       != 0; }
   bool is_final() const                          { return (_flags & (1 << is_final_shift))          != 0; }
   bool is_forced_virtual() const                 { return (_flags & (1 << is_forced_virtual_shift)) != 0; }
   bool is_vfinal() const                         { return (_flags & (1 << is_vfinal_shift))         != 0; }
   bool has_appendix() const                      { return (!is_f1_null()) && (_flags & (1 << has_appendix_shift))      != 0; }
   bool has_method_type() const                   { return (!is_f1_null()) && (_flags & (1 << has_method_type_shift))   != 0; }
   bool is_method_entry() const                   { return (_flags & (1 << is_field_entry_shift))    == 0; }
   bool is_field_entry() const                    { return (_flags & (1 << is_field_entry_shift))    != 0; }
   bool is_long() const                           { return flag_state() == ltos; }
   bool is_double() const                         { return flag_state() == dtos; }
   TosState flag_state() const                    { assert((uint)number_of_states <= (uint)tos_state_mask+1, "");
                                                    return (TosState)((_flags >> tos_state_shift) & tos_state_mask); }
   // Code generation support
   static WordSize size()                         { return in_WordSize(sizeof(ConstantPoolCacheEntry) / HeapWordSize); }
   static ByteSize size_in_bytes()                { return in_ByteSize(sizeof(ConstantPoolCacheEntry)); }
   static ByteSize indices_offset()               { return byte_offset_of(ConstantPoolCacheEntry, _indices); }
   static ByteSize f1_offset()                    { return byte_offset_of(ConstantPoolCacheEntry, _f1); }
   static ByteSize f2_offset()                    { return byte_offset_of(ConstantPoolCacheEntry, _f2); }
   static ByteSize flags_offset()                 { return byte_offset_of(ConstantPoolCacheEntry, _flags); }
 #if INCLUDE_JVMTI
   // RedefineClasses() API support:
   // If this ConstantPoolCacheEntry refers to old_method then update it
   // to refer to new_method.
   // trace_name_printed is set to true if the current call has
   // printed the klass name so that other routines in the adjust_*
   // group don't print the klass name.
   void adjust_method_entry(Method* old_method, Method* new_method,
          bool* trace_name_printed);
   bool check_no_old_or_obsolete_entries();
   Method* get_interesting_method_entry(Klass* k);
 #endif // INCLUDE_JVMTI
   // Debugging & Printing
   void print (outputStream* st, int index) const;
   void verify(outputStream* st) const;
   static void verify_tos_state_shift() {
     // When shifting flags as a 32-bit int, make sure we don't need an extra mask for tos_state:
     assert((((u4)-1 >> tos_state_shift) & ~tos_state_mask) == 0, "no need for tos_state mask");
   }
 };
 // A constant pool cache is a runtime data structure set aside to a constant pool. The cache
 // holds interpreter runtime information for all field access and invoke bytecodes. The cache
 // is created and initialized before a class is actively used (i.e., initialized), the indivi-
 // dual cache entries are filled at resolution (i.e., "link") time (see also: rewriter.*).
 class ConstantPoolCache: public MetaspaceObj {
   friend class VMStructs;
   friend class MetadataFactory;
  private:
   int             _length;
   ConstantPool*   _constant_pool;          // the corresponding constant pool
   // Sizing
   debug_only(friend class ClassVerifier;)
   // Constructor
   ConstantPoolCache(int length,
                     const intStack& inverse_index_map,
                     const intStack& invokedynamic_inverse_index_map,
                     const intStack& invokedynamic_references_map) :
                           _length(length),
                           _constant_pool(NULL) {
     initialize(inverse_index_map, invokedynamic_inverse_index_map,
                invokedynamic_references_map);
     for (int i = 0; i < length; i++) {
       assert(entry_at(i)->is_f1_null(), "Failed to clear?");
     }
   }
   // Initialization
   void initialize(const intArray& inverse_index_map,
                   const intArray& invokedynamic_inverse_index_map,
                   const intArray& invokedynamic_references_map);
  public:
   static ConstantPoolCache* allocate(ClassLoaderData* loader_data,
                                      const intStack& cp_cache_map,
                                      const intStack& invokedynamic_cp_cache_map,
                                      const intStack& invokedynamic_references_map, TRAPS);
   bool is_constantPoolCache() const { return true; }
   int length() const                             { return _length; }
  private:
   void set_length(int length)                    { _length = length; }
   static int header_size()                       { return sizeof(ConstantPoolCache) / HeapWordSize; }
   static int size(int length)                    { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
  public:
   int size() const                               { return size(length()); }
  private:
   // Helpers
   ConstantPool**        constant_pool_addr()   { return &_constant_pool; }
   ConstantPoolCacheEntry* base() const           { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
   friend class constantPoolCacheKlass;
   friend class ConstantPoolCacheEntry;
  public:
   // Accessors
   void set_constant_pool(ConstantPool* pool)   { _constant_pool = pool; }
   ConstantPool* constant_pool() const          { return _constant_pool; }
   // Fetches the entry at the given index.
   // In either case the index must not be encoded or byte-swapped in any way.
   ConstantPoolCacheEntry* entry_at(int i) const {
     assert(0 <= i && i < length(), "index out of bounds");
     return base() + i;
   }
   // Code generation
   static ByteSize base_offset()                  { return in_ByteSize(sizeof(ConstantPoolCache)); }
   static ByteSize entry_offset(int raw_index) {
     int index = raw_index;
     return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
   }
 #if INCLUDE_JVMTI
   // RedefineClasses() API support:
   // If any entry of this ConstantPoolCache points to any of
   // old_methods, replace it with the corresponding new_method.
   // trace_name_printed is set to true if the current call has
   // printed the klass name so that other routines in the adjust_*
   // group don't print the klass name.
   void adjust_method_entries(InstanceKlass* holder, bool* trace_name_printed);
   bool check_no_old_or_obsolete_entries();
   void dump_cache();
 #endif // INCLUDE_JVMTI
   // Deallocate - no fields to deallocate
   DEBUG_ONLY(bool on_stack() { return false; })
   void deallocate_contents(ClassLoaderData* data) {}
   bool is_klass() const { return false; }
   // Printing
   void print_on(outputStream* st) const;
   void print_value_on(outputStream* st) const;
   const char* internal_name() const { return "{constant pool cache}"; }
   // Verify
   void verify_on(outputStream* st);
 };
 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/cpCache.hpp@f8a45a60bc6b (annotated)

src/share/vm/oops/cpCache.hpp