227 lines
9.9 KiB
Java
227 lines
9.9 KiB
Java
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/*
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* Copyright (c) 2008, 2011, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* Extensively modified for IKVM.NET by Jeroen Frijters
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* Copyright (C) 2011 Jeroen Frijters
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*/
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package java.lang.invoke;
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import java.lang.invoke.MethodHandles.Lookup;
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import java.lang.reflect.AccessibleObject;
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import java.lang.reflect.Field;
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import static java.lang.invoke.MethodHandleNatives.Constants.*;
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import static java.lang.invoke.MethodHandles.Lookup.IMPL_LOOKUP;
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/**
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* The JVM interface for the method handles package is all here.
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* This is an interface internal and private to an implemetantion of JSR 292.
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* <em>This class is not part of the JSR 292 standard.</em>
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* @author jrose
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*/
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class MethodHandleNatives {
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private MethodHandleNatives() { } // static only
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/// MethodName support
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static native void init(MemberName self, Object ref);
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static native void expand(MemberName self);
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static native void resolve(MemberName self, Class<?> caller);
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static native int getMembers(Class<?> defc, String matchName, String matchSig,
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int matchFlags, Class<?> caller, int skip, MemberName[] results);
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/** Initialize a method type, once per form. */
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static void init(MethodType self) { }
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/** Fetch the name of the handled method, if available.
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* This routine is for debugging and reflection.
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*/
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static MemberName getMethodName(MethodHandle self) {
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throw new ikvm.internal.NotYetImplementedError();
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}
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static Object[] makeTarget(Class<?> defc, String name, String sig, int mods, Class<?> refc) {
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return new Object[] { defc, name, sig, mods, refc };
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}
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/** Java copy of MethodHandlePushLimit in range 2..255. */
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static final int JVM_PUSH_LIMIT;
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/** JVM stack motion (in words) after one slot is pushed, usually -1.
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*/
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static final int JVM_STACK_MOVE_UNIT;
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/** Which conv-ops are implemented by the JVM? */
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static final int CONV_OP_IMPLEMENTED_MASK;
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/** Derived mode flag. Only false on some old JVM implementations. */
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static final boolean HAVE_RICOCHET_FRAMES;
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static final int OP_ROT_ARGS_DOWN_LIMIT_BIAS;
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static {
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int k;
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JVM_PUSH_LIMIT = 3;
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JVM_STACK_MOVE_UNIT = 1;
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k = 0;
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CONV_OP_IMPLEMENTED_MASK = (k != 0) ? k : DEFAULT_CONV_OP_IMPLEMENTED_MASK;
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k = 0;
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OP_ROT_ARGS_DOWN_LIMIT_BIAS = (k != 0) ? (byte)k : -1;
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HAVE_RICOCHET_FRAMES = (CONV_OP_IMPLEMENTED_MASK & (1<<OP_COLLECT_ARGS)) != 0;
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//sun.reflect.Reflection.registerMethodsToFilter(MethodHandleImpl.class, "init");
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}
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// All compile-time constants go here.
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// There is an opportunity to check them against the JVM's idea of them.
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static class Constants {
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Constants() { } // static only
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// MethodHandleImpl
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static final int // for getConstant
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GC_JVM_PUSH_LIMIT = 0,
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GC_JVM_STACK_MOVE_UNIT = 1,
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GC_CONV_OP_IMPLEMENTED_MASK = 2,
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GC_OP_ROT_ARGS_DOWN_LIMIT_BIAS = 3;
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static final int
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ETF_HANDLE_OR_METHOD_NAME = 0, // all available data (immediate MH or method)
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ETF_DIRECT_HANDLE = 1, // ultimate method handle (will be a DMH, may be self)
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ETF_METHOD_NAME = 2, // ultimate method as MemberName
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ETF_REFLECT_METHOD = 3; // ultimate method as java.lang.reflect object (sans refClass)
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// MemberName
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// The JVM uses values of -2 and above for vtable indexes.
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// Field values are simple positive offsets.
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// Ref: src/share/vm/oops/methodOop.hpp
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// This value is negative enough to avoid such numbers,
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// but not too negative.
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static final int
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MN_IS_METHOD = 0x00010000, // method (not constructor)
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MN_IS_CONSTRUCTOR = 0x00020000, // constructor
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MN_IS_FIELD = 0x00040000, // field
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MN_IS_TYPE = 0x00080000, // nested type
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MN_SEARCH_SUPERCLASSES = 0x00100000, // for MHN.getMembers
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MN_SEARCH_INTERFACES = 0x00200000, // for MHN.getMembers
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VM_INDEX_UNINITIALIZED = -99;
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// BoundMethodHandle
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/** Constants for decoding the vmargslot field, which contains 2 values. */
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static final int
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ARG_SLOT_PUSH_SHIFT = 16,
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ARG_SLOT_MASK = (1<<ARG_SLOT_PUSH_SHIFT)-1;
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// AdapterMethodHandle
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/** Conversions recognized by the JVM.
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* They must align with the constants in java.lang.invoke.AdapterMethodHandle,
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* in the JVM file hotspot/src/share/vm/classfile/javaClasses.hpp.
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*/
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static final int
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OP_RETYPE_ONLY = 0x0, // no argument changes; straight retype
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OP_RETYPE_RAW = 0x1, // straight retype, trusted (void->int, Object->T)
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OP_CHECK_CAST = 0x2, // ref-to-ref conversion; requires a Class argument
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OP_PRIM_TO_PRIM = 0x3, // converts from one primitive to another
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OP_REF_TO_PRIM = 0x4, // unboxes a wrapper to produce a primitive
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OP_PRIM_TO_REF = 0x5, // boxes a primitive into a wrapper
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OP_SWAP_ARGS = 0x6, // swap arguments (vminfo is 2nd arg)
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OP_ROT_ARGS = 0x7, // rotate arguments (vminfo is displaced arg)
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OP_DUP_ARGS = 0x8, // duplicates one or more arguments (at TOS)
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OP_DROP_ARGS = 0x9, // remove one or more argument slots
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OP_COLLECT_ARGS = 0xA, // combine arguments using an auxiliary function
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OP_SPREAD_ARGS = 0xB, // expand in place a varargs array (of known size)
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OP_FOLD_ARGS = 0xC, // combine but do not remove arguments; prepend result
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//OP_UNUSED_13 = 0xD, // unused code, perhaps for reified argument lists
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CONV_OP_LIMIT = 0xE; // limit of CONV_OP enumeration
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/** Shift and mask values for decoding the AMH.conversion field.
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* These numbers are shared with the JVM for creating AMHs.
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*/
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static final int
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CONV_OP_MASK = 0xF00, // this nybble contains the conversion op field
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CONV_TYPE_MASK = 0x0F, // fits T_ADDRESS and below
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CONV_VMINFO_MASK = 0x0FF, // LSB is reserved for JVM use
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CONV_VMINFO_SHIFT = 0, // position of bits in CONV_VMINFO_MASK
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CONV_OP_SHIFT = 8, // position of bits in CONV_OP_MASK
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CONV_DEST_TYPE_SHIFT = 12, // byte 2 has the adapter BasicType (if needed)
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CONV_SRC_TYPE_SHIFT = 16, // byte 2 has the source BasicType (if needed)
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CONV_STACK_MOVE_SHIFT = 20, // high 12 bits give signed SP change
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CONV_STACK_MOVE_MASK = (1 << (32 - CONV_STACK_MOVE_SHIFT)) - 1;
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/** Which conv-ops are implemented by the JVM? */
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static final int DEFAULT_CONV_OP_IMPLEMENTED_MASK =
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// Value to use if the corresponding JVM query fails.
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((1<<OP_RETYPE_ONLY)
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|(1<<OP_RETYPE_RAW)
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|(1<<OP_CHECK_CAST)
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|(1<<OP_PRIM_TO_PRIM)
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|(1<<OP_REF_TO_PRIM)
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|(1<<OP_SWAP_ARGS)
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|(1<<OP_ROT_ARGS)
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|(1<<OP_DUP_ARGS)
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|(1<<OP_DROP_ARGS)
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//|(1<<OP_SPREAD_ARGS)
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);
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/**
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* Basic types as encoded in the JVM. These code values are not
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* intended for use outside this class. They are used as part of
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* a private interface between the JVM and this class.
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*/
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static final int
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T_BOOLEAN = 4,
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T_CHAR = 5,
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T_FLOAT = 6,
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T_DOUBLE = 7,
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T_BYTE = 8,
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T_SHORT = 9,
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T_INT = 10,
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T_LONG = 11,
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T_OBJECT = 12,
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//T_ARRAY = 13
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T_VOID = 14,
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//T_ADDRESS = 15
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T_ILLEGAL = 99;
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/**
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* Constant pool reference-kind codes, as used by CONSTANT_MethodHandle CP entries.
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*/
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static final int
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REF_getField = 1,
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REF_getStatic = 2,
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REF_putField = 3,
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REF_putStatic = 4,
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REF_invokeVirtual = 5,
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REF_invokeStatic = 6,
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REF_invokeSpecial = 7,
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REF_newInvokeSpecial = 8,
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REF_invokeInterface = 9;
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}
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/**
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* This assertion marks code which was written before ricochet frames were implemented.
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* Such code will go away when the ports catch up.
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*/
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static boolean workaroundWithoutRicochetFrames() {
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assert(!HAVE_RICOCHET_FRAMES) : "this code should not be executed if `-XX:+UseRicochetFrames is enabled";
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return true;
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}
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}
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