Mercurial > hg > truffle
diff graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotMemoryAccessProviderImpl.java @ 21551:5324104ac4f3
moved com.oracle.graal.hotspot.jvmci classes to com.oracle.jvmci.hotspot module (JBS:GRAAL-53)
author | Doug Simon <doug.simon@oracle.com> |
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date | Tue, 26 May 2015 17:13:37 +0200 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/HotSpotMemoryAccessProviderImpl.java Tue May 26 17:13:37 2015 +0200 @@ -0,0 +1,232 @@ +/* + * Copyright (c) 2011, 2015, 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 com.oracle.jvmci.hotspot; + +import static com.oracle.jvmci.common.UnsafeAccess.*; + +import com.oracle.graal.api.code.*; +import com.oracle.graal.api.meta.*; +import com.oracle.jvmci.common.*; +import com.oracle.jvmci.hotspot.HotSpotVMConfig.*; + +/** + * HotSpot implementation of {@link MemoryAccessProvider}. + */ +public class HotSpotMemoryAccessProviderImpl implements HotSpotMemoryAccessProvider, HotSpotProxified { + + protected final HotSpotJVMCIRuntimeProvider runtime; + + public 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) { + Object 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 JVMCIError("%s", metaspaceObject); + } + } + return false; + } + + private static long asRawPointer(Constant base) { + if (base instanceof HotSpotMetaspaceConstant) { + return ((HotSpotMetaspaceConstant) base).rawValue(); + } else if (base instanceof PrimitiveConstant) { + PrimitiveConstant prim = (PrimitiveConstant) base; + if (prim.getKind().isNumericInteger()) { + return prim.asLong(); + } + } + throw new JVMCIError("%s", base); + } + + private static long readRawValue(Constant baseConstant, long displacement, int bits) { + Object base = asObject(baseConstant); + if (base != null) { + switch (bits) { + case 8: + return unsafe.getByte(base, displacement); + case 16: + return unsafe.getShort(base, displacement); + case 32: + return unsafe.getInt(base, displacement); + case 64: + return unsafe.getLong(base, displacement); + default: + throw new JVMCIError("%d", bits); + } + } else { + long pointer = asRawPointer(baseConstant); + switch (bits) { + case 8: + return unsafe.getByte(pointer + displacement); + case 16: + return unsafe.getShort(pointer + displacement); + case 32: + return unsafe.getInt(pointer + displacement); + case 64: + return unsafe.getLong(pointer + displacement); + default: + throw new JVMCIError("%d", 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) { + Object 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(Kind kind, JavaConstant baseConstant, long displacement) { + if (kind == Kind.Object) { + Object o = readRawObject(baseConstant, displacement, runtime.getConfig().useCompressedOops); + return HotSpotObjectConstantImpl.forObject(o); + } else { + return readPrimitiveConstant(kind, baseConstant, displacement, kind.getByteCount() * 8); + } + } + + @Override + public JavaConstant readPrimitiveConstant(Kind 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 JVMCIError("Unsupported kind: %s", 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); + } + + @Override + public Constant readKlassPointerConstant(Constant base, long displacement) { + TargetDescription target = runtime.getHostJVMCIBackend().getCodeCache().getTarget(); + long klass = readRawValue(base, displacement, target.wordSize * 8); + if (klass == 0) { + return JavaConstant.NULL_POINTER; + } + HotSpotResolvedObjectType metaKlass = HotSpotResolvedObjectTypeImpl.fromMetaspaceKlass(klass); + return HotSpotMetaspaceConstantImpl.forMetaspaceObject(target.wordKind, klass, metaKlass, false); + } + + @Override + public Constant readNarrowKlassPointerConstant(Constant base, long displacement, CompressEncoding encoding) { + int compressed = (int) readRawValue(base, displacement, 32); + long klass = encoding.uncompress(compressed); + if (klass == 0) { + return HotSpotCompressedNullConstant.COMPRESSED_NULL; + } + HotSpotResolvedObjectType metaKlass = HotSpotResolvedObjectTypeImpl.fromMetaspaceKlass(klass); + return HotSpotMetaspaceConstantImpl.forMetaspaceObject(Kind.Int, compressed, metaKlass, true); + } + + @Override + public Constant readMethodPointerConstant(Constant base, long displacement) { + TargetDescription target = runtime.getHostJVMCIBackend().getCodeCache().getTarget(); + long method = readRawValue(base, displacement, target.wordSize * 8); + HotSpotResolvedJavaMethod metaMethod = HotSpotResolvedJavaMethodImpl.fromMetaspace(method); + return HotSpotMetaspaceConstantImpl.forMetaspaceObject(target.wordKind, method, metaMethod, false); + } +}