author | rschatz |
Fri, 25 Mar 2016 12:43:23 +0100 | |
changeset 36842 | 8f0d0faa51e2 |
parent 35837 | 7edbab7f12d0 |
child 37280 | bf5d76dcf685 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2011, 2016, 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. |
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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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package jdk.vm.ci.hotspot; |
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import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE; |
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import jdk.vm.ci.common.JVMCIError; |
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import jdk.vm.ci.hotspot.HotSpotVMConfig.CompressEncoding; |
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import jdk.vm.ci.meta.Constant; |
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import jdk.vm.ci.meta.JavaConstant; |
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import jdk.vm.ci.meta.JavaKind; |
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import jdk.vm.ci.meta.MemoryAccessProvider; |
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import jdk.vm.ci.meta.PrimitiveConstant; |
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/** |
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* HotSpot implementation of {@link MemoryAccessProvider}. |
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*/ |
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class HotSpotMemoryAccessProviderImpl implements HotSpotMemoryAccessProvider, HotSpotProxified { |
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protected final HotSpotJVMCIRuntimeProvider runtime; |
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HotSpotMemoryAccessProviderImpl(HotSpotJVMCIRuntimeProvider runtime) { |
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this.runtime = runtime; |
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} |
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private static Object asObject(Constant base) { |
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if (base instanceof HotSpotObjectConstantImpl) { |
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return ((HotSpotObjectConstantImpl) base).object(); |
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} else { |
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return null; |
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} |
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} |
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private boolean isValidObjectFieldDisplacement(Constant base, long displacement) { |
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if (base instanceof HotSpotMetaspaceConstant) { |
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MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); |
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if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) { |
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if (displacement == runtime.getConfig().classMirrorOffset) { |
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// Klass::_java_mirror is valid for all Klass* values |
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return true; |
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} |
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} else { |
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throw new JVMCIError("%s", metaspaceObject); |
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} |
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} |
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return false; |
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} |
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private static long asRawPointer(Constant base) { |
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if (base instanceof HotSpotMetaspaceConstantImpl) { |
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MetaspaceWrapperObject meta = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); |
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return meta.getMetaspacePointer(); |
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} else if (base instanceof PrimitiveConstant) { |
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PrimitiveConstant prim = (PrimitiveConstant) base; |
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if (prim.getJavaKind().isNumericInteger()) { |
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return prim.asLong(); |
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} |
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} |
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throw new JVMCIError("%s", base); |
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} |
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private static long readRawValue(Constant baseConstant, long displacement, int bits) { |
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Object base = asObject(baseConstant); |
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if (base != null) { |
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switch (bits) { |
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case Byte.SIZE: |
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return UNSAFE.getByte(base, displacement); |
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case Short.SIZE: |
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return UNSAFE.getShort(base, displacement); |
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case Integer.SIZE: |
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return UNSAFE.getInt(base, displacement); |
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case Long.SIZE: |
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return UNSAFE.getLong(base, displacement); |
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default: |
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throw new JVMCIError("%d", bits); |
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} |
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} else { |
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long pointer = asRawPointer(baseConstant); |
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switch (bits) { |
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case Byte.SIZE: |
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return UNSAFE.getByte(pointer + displacement); |
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case Short.SIZE: |
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return UNSAFE.getShort(pointer + displacement); |
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case Integer.SIZE: |
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return UNSAFE.getInt(pointer + displacement); |
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case Long.SIZE: |
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return UNSAFE.getLong(pointer + displacement); |
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default: |
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throw new JVMCIError("%d", bits); |
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} |
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} |
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} |
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private boolean verifyReadRawObject(Object expected, Constant base, long displacement, boolean compressed) { |
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if (compressed == runtime.getConfig().useCompressedOops) { |
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Object obj = asObject(base); |
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if (obj != null) { |
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assert expected == UNSAFE.getObject(obj, displacement) : "readUnsafeOop doesn't agree with unsafe.getObject"; |
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} |
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} |
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if (base instanceof HotSpotMetaspaceConstant) { |
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MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); |
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if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) { |
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if (displacement == runtime.getConfig().classMirrorOffset) { |
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assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror(); |
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} |
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} |
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} |
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return true; |
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} |
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private Object readRawObject(Constant baseConstant, long initialDisplacement, boolean compressed) { |
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long displacement = initialDisplacement; |
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Object ret; |
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Object base = asObject(baseConstant); |
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if (base == null) { |
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assert !compressed; |
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displacement += asRawPointer(baseConstant); |
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ret = runtime.getCompilerToVM().readUncompressedOop(displacement); |
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} else { |
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assert runtime.getConfig().useCompressedOops == compressed; |
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ret = UNSAFE.getObject(base, displacement); |
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} |
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assert verifyReadRawObject(ret, baseConstant, initialDisplacement, compressed); |
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return ret; |
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} |
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@Override |
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public JavaConstant readUnsafeConstant(JavaKind kind, JavaConstant baseConstant, long displacement) { |
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if (kind == JavaKind.Object) { |
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Object o = readRawObject(baseConstant, displacement, runtime.getConfig().useCompressedOops); |
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return HotSpotObjectConstantImpl.forObject(o); |
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} else { |
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int bits = kind.getByteCount() * Byte.SIZE; |
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return readPrimitiveConstant(kind, baseConstant, displacement, bits); |
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} |
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} |
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@Override |
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public JavaConstant readPrimitiveConstant(JavaKind kind, Constant baseConstant, long initialDisplacement, int bits) { |
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try { |
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long rawValue = readRawValue(baseConstant, initialDisplacement, bits); |
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switch (kind) { |
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case Boolean: |
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return JavaConstant.forBoolean(rawValue != 0); |
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case Byte: |
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return JavaConstant.forByte((byte) rawValue); |
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case Char: |
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return JavaConstant.forChar((char) rawValue); |
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case Short: |
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return JavaConstant.forShort((short) rawValue); |
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case Int: |
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return JavaConstant.forInt((int) rawValue); |
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case Long: |
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return JavaConstant.forLong(rawValue); |
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case Float: |
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return JavaConstant.forFloat(Float.intBitsToFloat((int) rawValue)); |
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case Double: |
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return JavaConstant.forDouble(Double.longBitsToDouble(rawValue)); |
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default: |
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throw new JVMCIError("Unsupported kind: %s", kind); |
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} |
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} catch (NullPointerException e) { |
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return null; |
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} |
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} |
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@Override |
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public JavaConstant readObjectConstant(Constant base, long displacement) { |
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if (!isValidObjectFieldDisplacement(base, displacement)) { |
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return null; |
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} |
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return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, false)); |
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} |
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@Override |
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public JavaConstant readNarrowOopConstant(Constant base, long displacement, CompressEncoding encoding) { |
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assert encoding.equals(runtime.getConfig().getOopEncoding()) : "unexpected oop encoding: " + encoding + " != " + runtime.getConfig().getOopEncoding(); |
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return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, true), true); |
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} |
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private HotSpotResolvedObjectTypeImpl readKlass(Constant base, long displacement, boolean compressed) { |
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assert (base instanceof HotSpotMetaspaceConstantImpl) || (base instanceof HotSpotObjectConstantImpl) : base.getClass(); |
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Object baseObject = (base instanceof HotSpotMetaspaceConstantImpl) ? ((HotSpotMetaspaceConstantImpl) base).asResolvedJavaType() : ((HotSpotObjectConstantImpl) base).object(); |
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return runtime.getCompilerToVM().getResolvedJavaType(baseObject, displacement, compressed); |
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} |
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@Override |
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public Constant readKlassPointerConstant(Constant base, long displacement) { |
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HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, false); |
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if (klass == null) { |
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return JavaConstant.NULL_POINTER; |
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} |
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return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, false); |
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} |
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@Override |
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public Constant readNarrowKlassPointerConstant(Constant base, long displacement, CompressEncoding encoding) { |
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HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, true); |
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if (klass == null) { |
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return HotSpotCompressedNullConstant.COMPRESSED_NULL; |
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} |
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return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, true); |
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} |
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@Override |
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public Constant readMethodPointerConstant(Constant base, long displacement) { |
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assert (base instanceof HotSpotObjectConstantImpl); |
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Object baseObject = ((HotSpotObjectConstantImpl) base).object(); |
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HotSpotResolvedJavaMethodImpl method = runtime.getCompilerToVM().getResolvedJavaMethod(baseObject, displacement); |
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return HotSpotMetaspaceConstantImpl.forMetaspaceObject(method, false); |
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} |
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@Override |
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public Constant readSymbolConstant(Constant base, long displacement) { |
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int bits = runtime.getConfig().symbolPointerSize * Byte.SIZE; |
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long pointer = readRawValue(base, displacement, bits); |
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if (pointer == 0) { |
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return JavaConstant.NULL_POINTER; |
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} else { |
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String symbol = runtime.getCompilerToVM().getSymbol(pointer); |
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return new HotSpotSymbol(symbol, pointer).asConstant(); |
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} |
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} |
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} |