Mercurial > hg > graal-jvmci-8
view jvmci/jdk.vm.ci.hotspot/src/jdk/vm/ci/hotspot/HotSpotMemoryAccessProviderImpl.java @ 23357:b05ad394cfd5
Add ResolvedJavaType.isAllocationClonable
author | Tom Rodriguez <tom.rodriguez@oracle.com> |
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date | Thu, 28 Apr 2016 13:07:46 -0700 |
parents | 67c84a8b19cc |
children | 73ceb487b9ca |
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/* * Copyright (c) 2011, 2016, 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. */ package jdk.vm.ci.hotspot; import static jdk.vm.ci.hotspot.UnsafeAccess.UNSAFE; import jdk.vm.ci.hotspot.HotSpotVMConfig.CompressEncoding; import jdk.vm.ci.meta.Constant; import jdk.vm.ci.meta.JavaConstant; import jdk.vm.ci.meta.JavaKind; import jdk.vm.ci.meta.MemoryAccessProvider; import jdk.vm.ci.meta.PrimitiveConstant; /** * HotSpot implementation of {@link MemoryAccessProvider}. */ class HotSpotMemoryAccessProviderImpl implements HotSpotMemoryAccessProvider, HotSpotProxified { protected final HotSpotJVMCIRuntimeProvider runtime; HotSpotMemoryAccessProviderImpl(HotSpotJVMCIRuntimeProvider runtime) { this.runtime = runtime; } private static Object asObject(Constant base) { if (base instanceof HotSpotObjectConstantImpl) { return ((HotSpotObjectConstantImpl) base).object(); } else { return null; } } private boolean isValidObjectFieldDisplacement(Constant base, long displacement) { if (base instanceof HotSpotMetaspaceConstant) { MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) { if (displacement == runtime.getConfig().classMirrorOffset) { // Klass::_java_mirror is valid for all Klass* values return true; } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) { // ArrayKlass::_component_mirror is only valid for all ArrayKlass* values return ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().isArray(); } } else { throw new IllegalArgumentException(String.valueOf(metaspaceObject)); } } return false; } private static long asRawPointer(Constant base) { if (base instanceof HotSpotMetaspaceConstantImpl) { MetaspaceWrapperObject meta = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); return meta.getMetaspacePointer(); } else if (base instanceof PrimitiveConstant) { PrimitiveConstant prim = (PrimitiveConstant) base; if (prim.getJavaKind().isNumericInteger()) { return prim.asLong(); } } throw new IllegalArgumentException(String.valueOf(base)); } private static long readRawValue(Constant baseConstant, long displacement, int bits) { Object base = asObject(baseConstant); if (base != null) { switch (bits) { case Byte.SIZE: return UNSAFE.getByte(base, displacement); case Short.SIZE: return UNSAFE.getShort(base, displacement); case Integer.SIZE: return UNSAFE.getInt(base, displacement); case Long.SIZE: return UNSAFE.getLong(base, displacement); default: throw new IllegalArgumentException(String.valueOf(bits)); } } else { long pointer = asRawPointer(baseConstant); switch (bits) { case Byte.SIZE: return UNSAFE.getByte(pointer + displacement); case Short.SIZE: return UNSAFE.getShort(pointer + displacement); case Integer.SIZE: return UNSAFE.getInt(pointer + displacement); case Long.SIZE: return UNSAFE.getLong(pointer + displacement); default: throw new IllegalArgumentException(String.valueOf(bits)); } } } private boolean verifyReadRawObject(Object expected, Constant base, long displacement, boolean compressed) { if (compressed == runtime.getConfig().useCompressedOops) { Object obj = asObject(base); if (obj != null) { assert expected == UNSAFE.getObject(obj, displacement) : "readUnsafeOop doesn't agree with unsafe.getObject"; } } if (base instanceof HotSpotMetaspaceConstant) { MetaspaceWrapperObject metaspaceObject = HotSpotMetaspaceConstantImpl.getMetaspaceObject(base); if (metaspaceObject instanceof HotSpotResolvedObjectTypeImpl) { if (displacement == runtime.getConfig().classMirrorOffset) { assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror(); } else if (displacement == runtime.getConfig().arrayKlassComponentMirrorOffset) { assert expected == ((HotSpotResolvedObjectTypeImpl) metaspaceObject).mirror().getComponentType(); } } } return true; } private Object readRawObject(Constant baseConstant, long initialDisplacement, boolean compressed) { long displacement = initialDisplacement; Object ret; Object base = asObject(baseConstant); if (base == null) { assert !compressed; displacement += asRawPointer(baseConstant); ret = runtime.getCompilerToVM().readUncompressedOop(displacement); } else { assert runtime.getConfig().useCompressedOops == compressed; ret = UNSAFE.getObject(base, displacement); } assert verifyReadRawObject(ret, baseConstant, initialDisplacement, compressed); return ret; } @Override public JavaConstant readUnsafeConstant(JavaKind kind, JavaConstant baseConstant, long displacement) { if (kind == JavaKind.Object) { Object o = readRawObject(baseConstant, displacement, runtime.getConfig().useCompressedOops); return HotSpotObjectConstantImpl.forObject(o); } else { int bits = kind.getByteCount() * Byte.SIZE; return readPrimitiveConstant(kind, baseConstant, displacement, bits); } } @Override public JavaConstant readPrimitiveConstant(JavaKind kind, Constant baseConstant, long initialDisplacement, int bits) { try { long rawValue = readRawValue(baseConstant, initialDisplacement, bits); switch (kind) { case Boolean: return JavaConstant.forBoolean(rawValue != 0); case Byte: return JavaConstant.forByte((byte) rawValue); case Char: return JavaConstant.forChar((char) rawValue); case Short: return JavaConstant.forShort((short) rawValue); case Int: return JavaConstant.forInt((int) rawValue); case Long: return JavaConstant.forLong(rawValue); case Float: return JavaConstant.forFloat(Float.intBitsToFloat((int) rawValue)); case Double: return JavaConstant.forDouble(Double.longBitsToDouble(rawValue)); default: throw new IllegalArgumentException("Unsupported kind: " + kind); } } catch (NullPointerException e) { return null; } } @Override public JavaConstant readObjectConstant(Constant base, long displacement) { if (!isValidObjectFieldDisplacement(base, displacement)) { return null; } return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, false)); } @Override public JavaConstant readNarrowOopConstant(Constant base, long displacement, CompressEncoding encoding) { assert encoding.equals(runtime.getConfig().getOopEncoding()) : "unexpected oop encoding: " + encoding + " != " + runtime.getConfig().getOopEncoding(); return HotSpotObjectConstantImpl.forObject(readRawObject(base, displacement, true), true); } private HotSpotResolvedObjectTypeImpl readKlass(Constant base, long displacement, boolean compressed) { assert (base instanceof HotSpotMetaspaceConstantImpl) || (base instanceof HotSpotObjectConstantImpl) : base.getClass(); Object baseObject = (base instanceof HotSpotMetaspaceConstantImpl) ? ((HotSpotMetaspaceConstantImpl) base).asResolvedJavaType() : ((HotSpotObjectConstantImpl) base).object(); return runtime.getCompilerToVM().getResolvedJavaType(baseObject, displacement, compressed); } @Override public Constant readKlassPointerConstant(Constant base, long displacement) { HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, false); if (klass == null) { return JavaConstant.NULL_POINTER; } return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, false); } @Override public Constant readNarrowKlassPointerConstant(Constant base, long displacement, CompressEncoding encoding) { HotSpotResolvedObjectTypeImpl klass = readKlass(base, displacement, true); if (klass == null) { return HotSpotCompressedNullConstant.COMPRESSED_NULL; } return HotSpotMetaspaceConstantImpl.forMetaspaceObject(klass, true); } @Override public Constant readMethodPointerConstant(Constant base, long displacement) { assert (base instanceof HotSpotObjectConstantImpl); Object baseObject = ((HotSpotObjectConstantImpl) base).object(); HotSpotResolvedJavaMethodImpl method = runtime.getCompilerToVM().getResolvedJavaMethod(baseObject, displacement); return HotSpotMetaspaceConstantImpl.forMetaspaceObject(method, false); } @Override public Constant readSymbolConstant(Constant base, long displacement) { int bits = runtime.getConfig().symbolPointerSize * Byte.SIZE; long pointer = readRawValue(base, displacement, bits); if (pointer == 0) { return JavaConstant.NULL_POINTER; } else { String symbol = runtime.getCompilerToVM().getSymbol(pointer); return new HotSpotSymbol(symbol, pointer).asConstant(); } } }