jdk8-mips64-public/hotspot: src/share/vm/oops/cpCacheOop.hpp@1d7922586cf6 (annotated)

src/share/vm/oops/cpCacheOop.hpp@1d7922586cf6 (annotated)

src/share/vm/oops/cpCacheOop.hpp

Tue, 24 Jul 2012 10:51:00 -0700

author: twisti
date: Tue, 24 Jul 2012 10:51:00 -0700
changeset 3969: 1d7922586cf6
parent 2982: ddd894528dbc
permissions: -rw-r--r--

7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>

 /*
  * Copyright (c) 1998, 2011, 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.
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 #ifndef SHARE_VM_OOPS_CPCACHEOOP_HPP
 #define SHARE_VM_OOPS_CPCACHEOOP_HPP
 #include "interpreter/bytecodes.hpp"
 #include "memory/allocation.hpp"
 #include "oops/arrayOop.hpp"
 #include "utilities/array.hpp"
 // 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 (!= 0, normal entries only)
 // _indices   [  index  |  00000  ]  index = main_entry_index (secondary entries only)
 // _f1        [  entry specific   ]  method, klass, or oop (MethodType or CallSite)
 // _f2        [  entry specific   ]  vtable index or vfinal method
 // _flags     [tos|0|00|00|00|f|v|f2|unused|field_index] (for field entries)
 // bit length [ 4 |1|1 |1 | 1|1|1| 1|---5--|----16-----]
 // _flags     [tos|M|vf|fv|ea|f|0|f2|unused|00000|psize] (for method entries)
 // bit length [ 4 |1|1 |1 | 1|1|1| 1|---5--|--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.
 // t      = TosState (see below)
 // f      = field is marked final (see below)
 // f2     = virtual but final (method entries only: is_vfinal())
 // v      = field is volatile (see below)
 // m      = invokeinterface used for method in class Object (see below)
 // h      = RedefineClasses/Hotswap bit (see below)
 //
 // 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 8 with the
 // following mapping to the TosState states:
 //
 // btos: 0
 // ctos: 1
 // stos: 2
 // itos: 3
 // ltos: 4
 // ftos: 5
 // dtos: 6
 // atos: 7
 // vtos: 8
 //
 // 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 klassOop)
 // _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      = methodOop for non-virtual calls, unused by virtual calls.
 //            for interface calls, which are essentially virtual but need a klass,
 //            contains klassOop 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 methodOop) 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 ConstantPoolCacheEntry VALUE_OBJ_CLASS_SPEC {
   friend class VMStructs;
   friend class constantPoolCacheKlass;
   friend class constantPoolOopDesc;  //resolve_constant_at_impl => set_f1
  private:
   volatile intx     _indices;  // constant pool index & rewrite bytecodes
   volatile oop      _f1;       // entry specific oop field
   volatile intx     _f2;       // entry specific int/oop field
   volatile intx     _flags;    // flags
 #ifdef ASSERT
   bool same_methodOop(oop cur_f1, oop f1);
 #endif
   void set_bytecode_1(Bytecodes::Code code);
   void set_bytecode_2(Bytecodes::Code code);
   void set_f1(oop f1)                            {
     oop existing_f1 = _f1; // read once
     assert(existing_f1 == NULL || existing_f1 == f1, "illegal field change");
     oop_store(&_f1, f1);
   }
   void release_set_f1(oop f1);
   void set_f2(intx f2)                           { assert(_f2 == 0 || _f2 == f2,            "illegal field change"); _f2 = f2; }
   void set_f2_as_vfinal_method(methodOop f2)     { assert(_f2 == 0 || _f2 == (intptr_t) f2, "illegal field change"); assert(is_vfinal(), "flags must be set"); _f2 = (intptr_t) 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_vfinal_shift            = 21,
     is_volatile_shift          = 22,
     is_final_shift             = 23,
     has_appendix_shift         = 24,
     is_forced_virtual_shift    = 25,
     is_field_entry_shift       = 26,
     // 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 {
     main_cp_index_bits         = 2*BitsPerByte,
     main_cp_index_mask         = right_n_bits(main_cp_index_bits),
     bytecode_1_shift           = main_cp_index_bits,
     bytecode_1_mask            = right_n_bits(BitsPerByte), // == (u1)0xFF
     bytecode_2_shift           = main_cp_index_bits + BitsPerByte,
     bytecode_2_mask            = right_n_bits(BitsPerByte), // == (u1)0xFF
     // the secondary cp index overlaps with bytecodes 1 and 2:
     secondary_cp_index_shift   = bytecode_1_shift,
     secondary_cp_index_bits    = BitsPerInt - main_cp_index_bits
   };
   // Initialization
   void initialize_entry(int original_index);     // initialize primary entry
   void initialize_secondary_entry(int main_index); // initialize secondary entry
   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
   );
   void set_method(                               // sets entry to resolved method entry
     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
   );
   void set_interface_call(
     methodHandle method,                         // Resolved method
     int index                                    // Method index into interface
   );
   void set_method_handle(
     methodHandle method,                         // adapter for invokeExact, etc.
     Handle appendix                              // stored in f1; could be a java.lang.invoke.MethodType
   );
   void set_dynamic_call(
     methodHandle method,                         // adapter for this call site
     Handle appendix                              // stored in f1; could be a java.lang.invoke.CallSite
   );
   // 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 methodOop 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(
     Bytecodes::Code invoke_code,                 // _invokehandle or _invokedynamic
     methodHandle adapter,                        // invoker method (f2)
     Handle appendix                              // appendix such as CallSite, MethodType, etc. (f1)
   );
   methodOop method_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::_invokeinterface : return 1;
       case Bytecodes::_putstatic       :    // fall through
       case Bytecodes::_putfield        :    // fall through
       case Bytecodes::_invokehandle    :    // fall through
       case Bytecodes::_invokedynamic   :    // 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
   bool is_secondary_entry() const                { return (_indices & main_cp_index_mask) == 0; }
   int main_entry_index() const                   { assert(is_secondary_entry(), "must be secondary entry");
                                                    return ((uintx)_indices >> secondary_cp_index_shift); }
   int primary_entry_indices() const              { assert(!is_secondary_entry(), "must be main entry");
                                                    return _indices; }
   int constant_pool_index() const                { return (primary_entry_indices() & main_cp_index_mask); }
   Bytecodes::Code bytecode_1() const             { return Bytecodes::cast((primary_entry_indices() >> bytecode_1_shift)
                                                                           & bytecode_1_mask); }
   Bytecodes::Code bytecode_2() const             { return Bytecodes::cast((primary_entry_indices() >> bytecode_2_shift)
                                                                           & bytecode_2_mask); }
   methodOop f1_as_method() const                 { oop f1 = _f1; assert(f1 == NULL || f1->is_method(), ""); return methodOop(f1); }
   klassOop  f1_as_klass() const                  { oop f1 = _f1; assert(f1 == NULL || f1->is_klass(), ""); return klassOop(f1); }
   oop       f1_as_klass_mirror() const           { oop f1 = f1_as_instance(); return f1; }  // i.e., return a java_mirror
   oop       f1_as_instance() const               { oop f1 = _f1; assert(f1 == NULL || f1->is_instance() || f1->is_array(), ""); return f1; }
   oop       f1_appendix() const                  { assert(has_appendix(), ""); return f1_as_instance(); }
   bool      is_f1_null() const                   { oop f1 = _f1; return f1 == NULL; }  // classifies a CPC entry as unbound
   int       f2_as_index() const                  { assert(!is_vfinal(), ""); return (int) _f2; }
   methodOop f2_as_vfinal_method() const          { assert(is_vfinal(), ""); return methodOop(_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 has_appendix() const                      { return (_flags & (1 << has_appendix_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 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_byte() const                           { return flag_state() == btos; }
   bool is_char() const                           { return flag_state() == ctos; }
   bool is_short() const                          { return flag_state() == stos; }
   bool is_int() const                            { return flag_state() == itos; }
   bool is_long() const                           { return flag_state() == ltos; }
   bool is_float() const                          { return flag_state() == ftos; }
   bool is_double() const                         { return flag_state() == dtos; }
   bool is_object() const                         { return flag_state() == atos; }
   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); }
   // GC Support
   void oops_do(void f(oop*));
   void oop_iterate(OopClosure* blk);
   void oop_iterate_m(OopClosure* blk, MemRegion mr);
   void follow_contents();
   void adjust_pointers();
 #ifndef SERIALGC
   // Parallel Old
   void follow_contents(ParCompactionManager* cm);
 #endif // SERIALGC
   void update_pointers();
   // 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.
   bool adjust_method_entry(methodOop old_method, methodOop new_method,
          bool * trace_name_printed);
   bool is_interesting_method_entry(klassOop k);
   // 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 constantPoolCacheOopDesc: public oopDesc {
   friend class VMStructs;
  private:
   int             _length;
   constantPoolOop _constant_pool;                // the corresponding constant pool
   // Sizing
   debug_only(friend class ClassVerifier;)
  public:
   int length() const                             { return _length; }
  private:
   void set_length(int length)                    { _length = length; }
   static int header_size()                       { return sizeof(constantPoolCacheOopDesc) / HeapWordSize; }
   static int object_size(int length)             { return align_object_size(header_size() + length * in_words(ConstantPoolCacheEntry::size())); }
   int object_size()                              { return object_size(length()); }
   // Helpers
   constantPoolOop*        constant_pool_addr()   { return &_constant_pool; }
   ConstantPoolCacheEntry* base() const           { return (ConstantPoolCacheEntry*)((address)this + in_bytes(base_offset())); }
   friend class constantPoolCacheKlass;
   friend class ConstantPoolCacheEntry;
  public:
   // Initialization
   void initialize(intArray& inverse_index_map);
   // Secondary indexes.
   // They must look completely different from normal indexes.
   // The main reason is that byte swapping is sometimes done on normal indexes.
   // Also, some of the CP accessors do different things for secondary indexes.
   // Finally, it is helpful for debugging to tell the two apart.
   static bool is_secondary_index(int i) { return (i < 0); }
   static int  decode_secondary_index(int i) { assert(is_secondary_index(i),  ""); return ~i; }
   static int  encode_secondary_index(int i) { assert(!is_secondary_index(i), ""); return ~i; }
   // Accessors
   void set_constant_pool(constantPoolOop pool)   { oop_store_without_check((oop*)&_constant_pool, (oop)pool); }
   constantPoolOop constant_pool() const          { return _constant_pool; }
   // Fetches the entry at the given index.
   // The entry may be either primary or secondary.
   // 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;
   }
   // Fetches the secondary entry referred to by index.
   // The index may be a secondary index, and must not be byte-swapped.
   ConstantPoolCacheEntry* secondary_entry_at(int i) const {
     int raw_index = i;
     if (is_secondary_index(i)) {  // correct these on the fly
       raw_index = decode_secondary_index(i);
     }
     assert(entry_at(raw_index)->is_secondary_entry(), "not a secondary entry");
     return entry_at(raw_index);
   }
   // Given a primary or secondary index, fetch the corresponding primary entry.
   // Indirect through the secondary entry, if the index is encoded as a secondary index.
   // The index must not be byte-swapped.
   ConstantPoolCacheEntry* main_entry_at(int i) const {
     int primary_index = i;
     if (is_secondary_index(i)) {
       // run through an extra level of indirection:
       int raw_index = decode_secondary_index(i);
       primary_index = entry_at(raw_index)->main_entry_index();
     }
     assert(!entry_at(primary_index)->is_secondary_entry(), "only one level of indirection");
     return entry_at(primary_index);
   }
   // Code generation
   static ByteSize base_offset()                  { return in_ByteSize(sizeof(constantPoolCacheOopDesc)); }
   static ByteSize entry_offset(int raw_index) {
     int index = raw_index;
     if (is_secondary_index(raw_index))
       index = decode_secondary_index(raw_index);
     return (base_offset() + ConstantPoolCacheEntry::size_in_bytes() * index);
   }
   // 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(methodOop* old_methods, methodOop* new_methods,
                              int methods_length, bool * trace_name_printed);
 };
 #endif // SHARE_VM_OOPS_CPCACHEOOP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/cpCacheOop.hpp@1d7922586cf6 (annotated)

src/share/vm/oops/cpCacheOop.hpp