jdk8-mips64-public/hotspot: src/share/vm/prims/methodHandles.hpp@3582bf76420e (annotated)

src/share/vm/prims/methodHandles.hpp@3582bf76420e (annotated)

src/share/vm/prims/methodHandles.hpp

Thu, 27 Jan 2011 16:11:27 -0800

author: coleenp
date: Thu, 27 Jan 2011 16:11:27 -0800
changeset 2497: 3582bf76420e
parent 2436: d810e9a3fc33
child 2639: 8033953d67ff
permissions: -rw-r--r--

6990754: Use native memory and reference counting to implement SymbolTable
Summary: move symbols from permgen into C heap and reference count them
Reviewed-by: never, acorn, jmasa, stefank

 /*
  * Copyright (c) 2008, 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.
  *
  */
 #ifndef SHARE_VM_PRIMS_METHODHANDLES_HPP
 #define SHARE_VM_PRIMS_METHODHANDLES_HPP
 #include "classfile/javaClasses.hpp"
 #include "classfile/vmSymbols.hpp"
 #include "runtime/frame.inline.hpp"
 #include "runtime/globals.hpp"
 #include "runtime/interfaceSupport.hpp"
 class MacroAssembler;
 class Label;
 class MethodHandleEntry;
 class MethodHandles: AllStatic {
   // JVM support for MethodHandle, MethodType, and related types
   // in java.dyn and java.dyn.hotspot.
   // See also  javaClasses for layouts java_dyn_Method{Handle,Type,Type::Form}.
  public:
   enum EntryKind {
     _raise_exception,           // stub for error generation from other stubs
     _invokestatic_mh,           // how a MH emulates invokestatic
     _invokespecial_mh,          // ditto for the other invokes...
     _invokevirtual_mh,
     _invokeinterface_mh,
     _bound_ref_mh,              // reference argument is bound
     _bound_int_mh,              // int argument is bound (via an Integer or Float)
     _bound_long_mh,             // long argument is bound (via a Long or Double)
     _bound_ref_direct_mh,       // same as above, with direct linkage to methodOop
     _bound_int_direct_mh,
     _bound_long_direct_mh,
     _adapter_mh_first,     // adapter sequence goes here...
     _adapter_retype_only   = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RETYPE_ONLY,
     _adapter_retype_raw    = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RETYPE_RAW,
     _adapter_check_cast    = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_CHECK_CAST,
     _adapter_prim_to_prim  = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_PRIM,
     _adapter_ref_to_prim   = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_REF_TO_PRIM,
     _adapter_prim_to_ref   = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_PRIM_TO_REF,
     _adapter_swap_args     = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SWAP_ARGS,
     _adapter_rot_args      = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_ROT_ARGS,
     _adapter_dup_args      = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DUP_ARGS,
     _adapter_drop_args     = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_DROP_ARGS,
     _adapter_collect_args  = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_COLLECT_ARGS,
     _adapter_spread_args   = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_SPREAD_ARGS,
     _adapter_flyby         = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_FLYBY,
     _adapter_ricochet      = _adapter_mh_first + sun_dyn_AdapterMethodHandle::OP_RICOCHET,
     _adapter_mh_last       = _adapter_mh_first + sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT - 1,
     // Optimized adapter types
     // argument list reordering
     _adapter_opt_swap_1,
     _adapter_opt_swap_2,
     _adapter_opt_rot_1_up,
     _adapter_opt_rot_1_down,
     _adapter_opt_rot_2_up,
     _adapter_opt_rot_2_down,
     // primitive single to single:
     _adapter_opt_i2i,           // i2c, i2z, i2b, i2s
     // primitive double to single:
     _adapter_opt_l2i,
     _adapter_opt_d2f,
     // primitive single to double:
     _adapter_opt_i2l,
     _adapter_opt_f2d,
     // conversion between floating point and integer type is handled by Java
     // reference to primitive:
     _adapter_opt_unboxi,
     _adapter_opt_unboxl,
     // spreading (array length cases 0, 1, >=2)
     _adapter_opt_spread_0,
     _adapter_opt_spread_1,
     _adapter_opt_spread_more,
     _EK_LIMIT,
     _EK_FIRST = 0
   };
  public:
   static bool enabled()                         { return _enabled; }
   static void set_enabled(bool z);
  private:
   enum {  // import sun_dyn_AdapterMethodHandle::CONV_OP_*
     CONV_OP_LIMIT         = sun_dyn_AdapterMethodHandle::CONV_OP_LIMIT,
     CONV_OP_MASK          = sun_dyn_AdapterMethodHandle::CONV_OP_MASK,
     CONV_VMINFO_MASK      = sun_dyn_AdapterMethodHandle::CONV_VMINFO_MASK,
     CONV_VMINFO_SHIFT     = sun_dyn_AdapterMethodHandle::CONV_VMINFO_SHIFT,
     CONV_OP_SHIFT         = sun_dyn_AdapterMethodHandle::CONV_OP_SHIFT,
     CONV_DEST_TYPE_SHIFT  = sun_dyn_AdapterMethodHandle::CONV_DEST_TYPE_SHIFT,
     CONV_SRC_TYPE_SHIFT   = sun_dyn_AdapterMethodHandle::CONV_SRC_TYPE_SHIFT,
     CONV_STACK_MOVE_SHIFT = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_SHIFT,
     CONV_STACK_MOVE_MASK  = sun_dyn_AdapterMethodHandle::CONV_STACK_MOVE_MASK
   };
   static bool _enabled;
   static MethodHandleEntry* _entries[_EK_LIMIT];
   static const char*        _entry_names[_EK_LIMIT+1];
   static jobject            _raise_exception_method;
   // Adapters.
   static MethodHandlesAdapterBlob* _adapter_code;
   static int                       _adapter_code_size;
   static bool ek_valid(EntryKind ek)            { return (uint)ek < (uint)_EK_LIMIT; }
   static bool conv_op_valid(int op)             { return (uint)op < (uint)CONV_OP_LIMIT; }
  public:
   static bool    have_entry(EntryKind ek)       { return ek_valid(ek) && _entries[ek] != NULL; }
   static MethodHandleEntry* entry(EntryKind ek) { assert(ek_valid(ek), "initialized");
                                                   return _entries[ek]; }
   static const char* entry_name(EntryKind ek)   { assert(ek_valid(ek), "oob");
                                                   return _entry_names[ek]; }
   static EntryKind adapter_entry_kind(int op)   { assert(conv_op_valid(op), "oob");
                                                   return EntryKind(_adapter_mh_first + op); }
   static void init_entry(EntryKind ek, MethodHandleEntry* me) {
     assert(ek_valid(ek), "oob");
     assert(_entries[ek] == NULL, "no double initialization");
     _entries[ek] = me;
   }
   // Some adapter helper functions.
   static void get_ek_bound_mh_info(EntryKind ek, BasicType& arg_type, int& arg_mask, int& arg_slots) {
     switch (ek) {
     case _bound_int_mh        : // fall-thru
     case _bound_int_direct_mh : arg_type = T_INT;    arg_mask = _INSERT_INT_MASK;  break;
     case _bound_long_mh       : // fall-thru
     case _bound_long_direct_mh: arg_type = T_LONG;   arg_mask = _INSERT_LONG_MASK; break;
     case _bound_ref_mh        : // fall-thru
     case _bound_ref_direct_mh : arg_type = T_OBJECT; arg_mask = _INSERT_REF_MASK;  break;
     default: ShouldNotReachHere();
     }
     arg_slots = type2size[arg_type];
   }
   static void get_ek_adapter_opt_swap_rot_info(EntryKind ek, int& swap_bytes, int& rotate) {
     int swap_slots = 0;
     switch (ek) {
     case _adapter_opt_swap_1:     swap_slots = 1; rotate =  0; break;
     case _adapter_opt_swap_2:     swap_slots = 2; rotate =  0; break;
     case _adapter_opt_rot_1_up:   swap_slots = 1; rotate =  1; break;
     case _adapter_opt_rot_1_down: swap_slots = 1; rotate = -1; break;
     case _adapter_opt_rot_2_up:   swap_slots = 2; rotate =  1; break;
     case _adapter_opt_rot_2_down: swap_slots = 2; rotate = -1; break;
     default: ShouldNotReachHere();
     }
     // Return the size of the stack slots to move in bytes.
     swap_bytes = swap_slots * Interpreter::stackElementSize;
   }
   static int get_ek_adapter_opt_spread_info(EntryKind ek) {
     switch (ek) {
     case _adapter_opt_spread_0: return  0;
     case _adapter_opt_spread_1: return  1;
     default                   : return -1;
     }
   }
   static methodOop raise_exception_method() {
     oop rem = JNIHandles::resolve(_raise_exception_method);
     assert(rem == NULL || rem->is_method(), "");
     return (methodOop) rem;
   }
   static void set_raise_exception_method(methodOop rem) {
     assert(_raise_exception_method == NULL, "");
     _raise_exception_method = JNIHandles::make_global(Handle(rem));
   }
   static jint adapter_conversion(int conv_op, BasicType src, BasicType dest,
                                  int stack_move = 0, int vminfo = 0) {
     assert(conv_op_valid(conv_op), "oob");
     jint conv = ((conv_op      << CONV_OP_SHIFT)
                  | (src        << CONV_SRC_TYPE_SHIFT)
                  | (dest       << CONV_DEST_TYPE_SHIFT)
                  | (stack_move << CONV_STACK_MOVE_SHIFT)
                  | (vminfo     << CONV_VMINFO_SHIFT)
                  );
     assert(adapter_conversion_op(conv) == conv_op, "decode conv_op");
     assert(adapter_conversion_src_type(conv) == src, "decode src");
     assert(adapter_conversion_dest_type(conv) == dest, "decode dest");
     assert(adapter_conversion_stack_move(conv) == stack_move, "decode stack_move");
     assert(adapter_conversion_vminfo(conv) == vminfo, "decode vminfo");
     return conv;
   }
   static int adapter_conversion_op(jint conv) {
     return ((conv >> CONV_OP_SHIFT) & 0xF);
   }
   static BasicType adapter_conversion_src_type(jint conv) {
     return (BasicType)((conv >> CONV_SRC_TYPE_SHIFT) & 0xF);
   }
   static BasicType adapter_conversion_dest_type(jint conv) {
     return (BasicType)((conv >> CONV_DEST_TYPE_SHIFT) & 0xF);
   }
   static int adapter_conversion_stack_move(jint conv) {
     return (conv >> CONV_STACK_MOVE_SHIFT);
   }
   static int adapter_conversion_vminfo(jint conv) {
     return (conv >> CONV_VMINFO_SHIFT) & CONV_VMINFO_MASK;
   }
   // Bit mask of conversion_op values.  May vary by platform.
   static int adapter_conversion_ops_supported_mask();
   // Offset in words that the interpreter stack pointer moves when an argument is pushed.
   // The stack_move value must always be a multiple of this.
   static int stack_move_unit() {
     return frame::interpreter_frame_expression_stack_direction() * Interpreter::stackElementWords;
   }
   enum { CONV_VMINFO_SIGN_FLAG = 0x80 };
   // Shift values for prim-to-prim conversions.
   static int adapter_prim_to_prim_subword_vminfo(BasicType dest) {
     if (dest == T_BOOLEAN) return (BitsPerInt - 1);  // boolean is 1 bit
     if (dest == T_CHAR)    return (BitsPerInt - BitsPerShort);
     if (dest == T_BYTE)    return (BitsPerInt - BitsPerByte ) | CONV_VMINFO_SIGN_FLAG;
     if (dest == T_SHORT)   return (BitsPerInt - BitsPerShort) | CONV_VMINFO_SIGN_FLAG;
     return 0;                   // case T_INT
   }
   // Shift values for unboxing a primitive.
   static int adapter_unbox_subword_vminfo(BasicType dest) {
     if (dest == T_BOOLEAN) return (BitsPerInt - BitsPerByte );  // implemented as 1 byte
     if (dest == T_CHAR)    return (BitsPerInt - BitsPerShort);
     if (dest == T_BYTE)    return (BitsPerInt - BitsPerByte ) | CONV_VMINFO_SIGN_FLAG;
     if (dest == T_SHORT)   return (BitsPerInt - BitsPerShort) | CONV_VMINFO_SIGN_FLAG;
     return 0;                   // case T_INT
   }
   // Here is the transformation the i2i adapter must perform:
   static int truncate_subword_from_vminfo(jint value, int vminfo) {
     jint tem = value << vminfo;
     if ((vminfo & CONV_VMINFO_SIGN_FLAG) != 0) {
       return (jint)tem >> vminfo;
     } else {
       return (juint)tem >> vminfo;
     }
   }
   static inline address from_compiled_entry(EntryKind ek);
   static inline address from_interpreted_entry(EntryKind ek);
   // helpers for decode_method.
   static methodOop decode_methodOop(methodOop m, int& decode_flags_result);
   static methodOop decode_vmtarget(oop vmtarget, int vmindex, oop mtype, klassOop& receiver_limit_result, int& decode_flags_result);
   static methodOop decode_MemberName(oop mname, klassOop& receiver_limit_result, int& decode_flags_result);
   static methodOop decode_MethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
   static methodOop decode_DirectMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
   static methodOop decode_BoundMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
   static methodOop decode_AdapterMethodHandle(oop mh, klassOop& receiver_limit_result, int& decode_flags_result);
   // Find out how many stack slots an mh pushes or pops.
   // The result is *not* reported as a multiple of stack_move_unit();
   // It is a signed net number of pushes (a difference in vmslots).
   // To compare with a stack_move value, first multiply by stack_move_unit().
   static int decode_MethodHandle_stack_pushes(oop mh);
  public:
   // working with member names
   static void resolve_MemberName(Handle mname, TRAPS); // compute vmtarget/vmindex from name/type
   static void expand_MemberName(Handle mname, int suppress, TRAPS);  // expand defc/name/type if missing
   static Handle new_MemberName(TRAPS);  // must be followed by init_MemberName
   static void init_MemberName(oop mname_oop, oop target); // compute vmtarget/vmindex from target
   static void init_MemberName(oop mname_oop, methodOop m, bool do_dispatch = true);
   static void init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset);
   static int find_MemberNames(klassOop k, Symbol* name, Symbol* sig,
                               int mflags, klassOop caller,
                               int skip, objArrayOop results);
   // bit values for suppress argument to expand_MemberName:
   enum { _suppress_defc = 1, _suppress_name = 2, _suppress_type = 4 };
   // Generate MethodHandles adapters.
   static void generate_adapters();
   // Called from InterpreterGenerator and MethodHandlesAdapterGenerator.
   static address generate_method_handle_interpreter_entry(MacroAssembler* _masm);
   static void generate_method_handle_stub(MacroAssembler* _masm, EntryKind ek);
   // argument list parsing
   static int argument_slot(oop method_type, int arg);
   static int argument_slot_count(oop method_type) { return argument_slot(method_type, -1); }
   static int argument_slot_to_argnum(oop method_type, int argslot);
   // Runtime support
   enum {                        // bit-encoded flags from decode_method or decode_vmref
     _dmf_has_receiver   = 0x01, // target method has leading reference argument
     _dmf_does_dispatch  = 0x02, // method handle performs virtual or interface dispatch
     _dmf_from_interface = 0x04, // peforms interface dispatch
     _DMF_DIRECT_MASK    = (_dmf_from_interface*2 - _dmf_has_receiver),
     _dmf_binds_method   = 0x08,
     _dmf_binds_argument = 0x10,
     _DMF_BOUND_MASK     = (_dmf_binds_argument*2 - _dmf_binds_method),
     _dmf_adapter_lsb    = 0x20,
     _DMF_ADAPTER_MASK   = (_dmf_adapter_lsb << CONV_OP_LIMIT) - _dmf_adapter_lsb
   };
   static methodOop decode_method(oop x, klassOop& receiver_limit_result, int& decode_flags_result);
   enum {
     // format of query to getConstant:
     GC_JVM_PUSH_LIMIT = 0,
     GC_JVM_STACK_MOVE_UNIT = 1,
     GC_CONV_OP_IMPLEMENTED_MASK = 2,
     // format of result from getTarget / encode_target:
     ETF_HANDLE_OR_METHOD_NAME = 0, // all available data (immediate MH or method)
     ETF_DIRECT_HANDLE         = 1, // ultimate method handle (will be a DMH, may be self)
     ETF_METHOD_NAME           = 2, // ultimate method as MemberName
     ETF_REFLECT_METHOD        = 3  // ultimate method as java.lang.reflect object (sans refClass)
   };
   static int get_named_constant(int which, Handle name_box, TRAPS);
   static oop encode_target(Handle mh, int format, TRAPS); // report vmtarget (to Java code)
   static bool class_cast_needed(klassOop src, klassOop dst);
   static instanceKlassHandle resolve_instance_klass(oop    java_mirror_oop, TRAPS);
   static instanceKlassHandle resolve_instance_klass(jclass java_mirror_jh,  TRAPS) {
     return resolve_instance_klass(JNIHandles::resolve(java_mirror_jh), THREAD);
   }
  private:
   // These checkers operate on a pair of whole MethodTypes:
   static const char* check_method_type_change(oop src_mtype, int src_beg, int src_end,
                                               int insert_argnum, oop insert_type,
                                               int change_argnum, oop change_type,
                                               int delete_argnum,
                                               oop dst_mtype, int dst_beg, int dst_end,
                                               bool raw = false);
   static const char* check_method_type_insertion(oop src_mtype,
                                                  int insert_argnum, oop insert_type,
                                                  oop dst_mtype) {
     oop no_ref = NULL;
     return check_method_type_change(src_mtype, 0, -1,
                                     insert_argnum, insert_type,
                                     -1, no_ref, -1, dst_mtype, 0, -1);
   }
   static const char* check_method_type_conversion(oop src_mtype,
                                                   int change_argnum, oop change_type,
                                                   oop dst_mtype) {
     oop no_ref = NULL;
     return check_method_type_change(src_mtype, 0, -1, -1, no_ref,
                                     change_argnum, change_type,
                                     -1, dst_mtype, 0, -1);
   }
   static const char* check_method_type_passthrough(oop src_mtype, oop dst_mtype, bool raw) {
     oop no_ref = NULL;
     return check_method_type_change(src_mtype, 0, -1,
                                     -1, no_ref, -1, no_ref, -1,
                                     dst_mtype, 0, -1, raw);
   }
   // These checkers operate on pairs of argument or return types:
   static const char* check_argument_type_change(BasicType src_type, klassOop src_klass,
                                                 BasicType dst_type, klassOop dst_klass,
                                                 int argnum, bool raw = false);
   static const char* check_argument_type_change(oop src_type, oop dst_type,
                                                 int argnum, bool raw = false) {
     klassOop src_klass = NULL, dst_klass = NULL;
     BasicType src_bt = java_lang_Class::as_BasicType(src_type, &src_klass);
     BasicType dst_bt = java_lang_Class::as_BasicType(dst_type, &dst_klass);
     return check_argument_type_change(src_bt, src_klass,
                                       dst_bt, dst_klass, argnum, raw);
   }
   static const char* check_return_type_change(oop src_type, oop dst_type, bool raw = false) {
     return check_argument_type_change(src_type, dst_type, -1, raw);
   }
   static const char* check_return_type_change(BasicType src_type, klassOop src_klass,
                                               BasicType dst_type, klassOop dst_klass) {
     return check_argument_type_change(src_type, src_klass, dst_type, dst_klass, -1);
   }
   static const char* check_method_receiver(methodOop m, klassOop passed_recv_type);
   // These verifiers can block, and will throw an error if the checking fails:
   static void verify_vmslots(Handle mh, TRAPS);
   static void verify_vmargslot(Handle mh, int argnum, int argslot, TRAPS);
   static void verify_method_type(methodHandle m, Handle mtype,
                                  bool has_bound_oop,
                                  KlassHandle bound_oop_type,
                                  TRAPS);
   static void verify_method_signature(methodHandle m, Handle mtype,
                                       int first_ptype_pos,
                                       KlassHandle insert_ptype, TRAPS);
   static void verify_DirectMethodHandle(Handle mh, methodHandle m, TRAPS);
   static void verify_BoundMethodHandle(Handle mh, Handle target, int argnum,
                                        bool direct_to_method, TRAPS);
   static void verify_BoundMethodHandle_with_receiver(Handle mh, methodHandle m, TRAPS);
   static void verify_AdapterMethodHandle(Handle mh, int argnum, TRAPS);
  public:
   // Fill in the fields of a DirectMethodHandle mh.  (MH.type must be pre-filled.)
   static void init_DirectMethodHandle(Handle mh, methodHandle method, bool do_dispatch, TRAPS);
   // Fill in the fields of a BoundMethodHandle mh.  (MH.type, BMH.argument must be pre-filled.)
   static void init_BoundMethodHandle(Handle mh, Handle target, int argnum, TRAPS);
   static void init_BoundMethodHandle_with_receiver(Handle mh,
                                                    methodHandle original_m,
                                                    KlassHandle receiver_limit,
                                                    int decode_flags,
                                                    TRAPS);
   // Fill in the fields of an AdapterMethodHandle mh.  (MH.type must be pre-filled.)
   static void init_AdapterMethodHandle(Handle mh, Handle target, int argnum, TRAPS);
 #ifdef ASSERT
   static bool spot_check_entry_names();
 #endif
  private:
   static methodHandle dispatch_decoded_method(methodHandle m,
                                               KlassHandle receiver_limit,
                                               int decode_flags,
                                               KlassHandle receiver_klass,
                                               TRAPS);
   static bool same_basic_type_for_arguments(BasicType src, BasicType dst,
                                             bool raw = false,
                                             bool for_return = false);
   static bool same_basic_type_for_returns(BasicType src, BasicType dst, bool raw = false) {
     return same_basic_type_for_arguments(src, dst, raw, true);
   }
   enum {                        // arg_mask values
     _INSERT_NO_MASK   = -1,
     _INSERT_REF_MASK  = 0,
     _INSERT_INT_MASK  = 1,
     _INSERT_LONG_MASK = 3
   };
   static void insert_arg_slots(MacroAssembler* _masm,
                                RegisterOrConstant arg_slots,
                                int arg_mask,
                                Register argslot_reg,
                                Register temp_reg, Register temp2_reg, Register temp3_reg = noreg);
   static void remove_arg_slots(MacroAssembler* _masm,
                                RegisterOrConstant arg_slots,
                                Register argslot_reg,
                                Register temp_reg, Register temp2_reg, Register temp3_reg = noreg);
   static void trace_method_handle(MacroAssembler* _masm, const char* adaptername) PRODUCT_RETURN;
   static Symbol* convert_to_signature(oop type_str, bool polymorphic, TRAPS);
 };
 // Access methods for the "entry" field of a java.dyn.MethodHandle.
 // The field is primarily a jump target for compiled calls.
 // However, we squirrel away some nice pointers for other uses,
 // just before the jump target.
 // Aspects of a method handle entry:
 //  - from_compiled_entry - stub used when compiled code calls the MH
 //  - from_interpreted_entry - stub used when the interpreter calls the MH
 //  - type_checking_entry - stub for runtime casting between MHForm siblings (NYI)
 class MethodHandleEntry {
  public:
   class Data {
     friend class MethodHandleEntry;
     size_t              _total_size; // size including Data and code stub
     MethodHandleEntry*  _type_checking_entry;
     address             _from_interpreted_entry;
     MethodHandleEntry* method_entry() { return (MethodHandleEntry*)(this + 1); }
   };
   Data*     data()                              { return (Data*)this - 1; }
   address   start_address()                     { return (address) data(); }
   address   end_address()                       { return start_address() + data()->_total_size; }
   address   from_compiled_entry()               { return (address) this; }
   address   from_interpreted_entry()            { return data()->_from_interpreted_entry; }
   void  set_from_interpreted_entry(address e)   { data()->_from_interpreted_entry = e; }
   MethodHandleEntry* type_checking_entry()           { return data()->_type_checking_entry; }
   void set_type_checking_entry(MethodHandleEntry* e) { data()->_type_checking_entry = e; }
   void set_end_address(address end_addr) {
     size_t total_size = end_addr - start_address();
     assert(total_size > 0 && total_size < 0x1000, "reasonable end address");
     data()->_total_size = total_size;
   }
   // Compiler support:
   static int from_interpreted_entry_offset_in_bytes() {
     return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) );
   }
   static int type_checking_entry_offset_in_bytes() {
     return (int)( offset_of(Data, _from_interpreted_entry) - sizeof(Data) );
   }
   static address            start_compiled_entry(MacroAssembler* _masm,
                                                  address interpreted_entry = NULL);
   static MethodHandleEntry* finish_compiled_entry(MacroAssembler* masm, address start_addr);
 };
 address MethodHandles::from_compiled_entry(EntryKind ek) { return entry(ek)->from_compiled_entry(); }
 address MethodHandles::from_interpreted_entry(EntryKind ek) { return entry(ek)->from_interpreted_entry(); }
 //------------------------------------------------------------------------------
 // MethodHandlesAdapterGenerator
 //
 class MethodHandlesAdapterGenerator : public StubCodeGenerator {
 public:
   MethodHandlesAdapterGenerator(CodeBuffer* code) : StubCodeGenerator(code) {}
   void generate();
 };
 #endif // SHARE_VM_PRIMS_METHODHANDLES_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/methodHandles.hpp@3582bf76420e (annotated)

src/share/vm/prims/methodHandles.hpp