--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/prims/methodHandles.hpp	Wed Apr 08 10:56:49 2009 -0700
@@ -0,0 +1,435 @@
+/*
+ * Copyright 2008-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+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 {
+    _check_mtype,               // how a caller calls a MH
+    _wrong_method_type,         // what happens when there is a type mismatch
+    _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_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 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;
+  }
+
+  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;
+  }
+
+  // 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 };
+  static int adapter_subword_vminfo(BasicType dest) {
+    if (dest == T_BOOLEAN) return (BitsPerInt -  1);
+    if (dest == T_CHAR)    return (BitsPerInt - 16);
+    if (dest == T_BYTE)    return (BitsPerInt -  8) | CONV_VMINFO_SIGN_FLAG;
+    if (dest == T_SHORT)   return (BitsPerInt - 16) | 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 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);
+  static void init_MemberName(oop mname_oop, klassOop field_holder, AccessFlags mods, int offset);
+  static int find_MemberNames(klassOop k, symbolOop name, symbolOop 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 };
+
+  // called from InterpreterGenerator and StubGenerator
+  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_LIMIT = 1,
+
+    // 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);
+
+ 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);
+  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) {
+    oop no_ref = NULL;
+    return check_method_type_change(src_mtype, 0, -1,
+                                    -1, no_ref, -1, no_ref, -1,
+                                    dst_mtype, 0, -1);
+  }
+
+  // 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);
+
+  static const char* check_argument_type_change(oop src_type, oop dst_type,
+                                                int argnum) {
+    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);
+  }
+
+  static const char* check_return_type_change(oop src_type, oop dst_type) {
+    return check_argument_type_change(src_type, dst_type, -1);
+  }
+
+  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 for_return = false);
+  static bool same_basic_type_for_returns(BasicType src, BasicType dst) {
+    return same_basic_type_for_arguments(src, dst, 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 rax_argslot,
+                               Register rbx_temp, Register rdx_temp);
+
+  static void remove_arg_slots(MacroAssembler* _masm,
+                               RegisterOrConstant arg_slots,
+                               Register rax_argslot,
+                               Register rbx_temp, Register rdx_temp);
+};
+
+
+// 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(); }