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view graal/com.oracle.graal.hotspot/src/com/oracle/graal/hotspot/stubs/ForeignCallStub.java @ 15261:882f4cb7cfcf
Move Stamps to graal.compiler.common.
author | Josef Eisl <josef.eisl@jku.at> |
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date | Tue, 22 Apr 2014 11:51:34 +0200 |
parents | 2c0cfbf454b5 |
children | 10c12d09a8d2 |
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/* * Copyright (c) 2012, 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.graal.hotspot.stubs; import static com.oracle.graal.api.code.CallingConvention.Type.*; import static com.oracle.graal.api.meta.MetaUtil.*; import static com.oracle.graal.hotspot.HotSpotForeignCallLinkage.RegisterEffect.*; import com.oracle.graal.api.meta.*; import com.oracle.graal.compiler.common.type.*; import com.oracle.graal.debug.*; import com.oracle.graal.hotspot.*; import com.oracle.graal.hotspot.HotSpotForeignCallLinkage.Transition; import com.oracle.graal.hotspot.meta.*; import com.oracle.graal.hotspot.nodes.*; import com.oracle.graal.hotspot.replacements.*; import com.oracle.graal.nodes.*; import com.oracle.graal.replacements.*; import com.oracle.graal.replacements.nodes.*; import com.oracle.graal.word.*; /** * A {@linkplain #getGraph() generated} stub for a {@link Transition non-leaf} foreign call from * compiled code. A stub is required for such calls as the caller may be scheduled for * deoptimization while the call is in progress. And since these are foreign/runtime calls on slow * paths, we don't want to force the register allocator to spill around the call. As such, this stub * saves and restores all allocatable registers. It also * {@linkplain StubUtil#handlePendingException(Word, boolean) handles} any exceptions raised during * the foreign call. */ public class ForeignCallStub extends Stub { /** * The target of the call. */ private final HotSpotForeignCallLinkage target; /** * Specifies if the JavaThread value for the current thread is to be prepended to the arguments * for the call to {@link #target}. */ protected final boolean prependThread; /** * Creates a stub for a call to code at a given address. * * @param address the address of the code to call * @param descriptor the signature of the call to this stub * @param prependThread true if the JavaThread value for the current thread is to be prepended * to the arguments for the call to {@code address} * @param reexecutable specifies if the stub call can be re-executed without (meaningful) side * effects. Deoptimization will not return to a point before a stub call that cannot * be re-executed. * @param killedLocations the memory locations killed by the stub call */ public ForeignCallStub(HotSpotProviders providers, long address, ForeignCallDescriptor descriptor, boolean prependThread, Transition transition, boolean reexecutable, LocationIdentity... killedLocations) { super(providers, HotSpotForeignCallLinkage.create(providers.getMetaAccess(), providers.getCodeCache(), providers.getForeignCalls(), descriptor, 0L, PRESERVES_REGISTERS, JavaCall, JavaCallee, transition, reexecutable, killedLocations)); this.prependThread = prependThread; Class<?>[] targetParameterTypes = createTargetParameters(descriptor); ForeignCallDescriptor targetSig = new ForeignCallDescriptor(descriptor.getName() + ":C", descriptor.getResultType(), targetParameterTypes); target = HotSpotForeignCallLinkage.create(providers.getMetaAccess(), providers.getCodeCache(), providers.getForeignCalls(), targetSig, address, DESTROYS_REGISTERS, NativeCall, NativeCall, transition, reexecutable, killedLocations); } /** * Gets the linkage information for the call from this stub. */ public HotSpotForeignCallLinkage getTargetLinkage() { return target; } private Class<?>[] createTargetParameters(ForeignCallDescriptor descriptor) { Class<?>[] parameters = descriptor.getArgumentTypes(); if (prependThread) { Class<?>[] newParameters = new Class[parameters.length + 1]; System.arraycopy(parameters, 0, newParameters, 1, parameters.length); newParameters[0] = Word.class; return newParameters; } return parameters; } @Override protected ResolvedJavaMethod getInstalledCodeOwner() { return null; } @Override protected Object debugScopeContext() { return new JavaMethod() { public Signature getSignature() { ForeignCallDescriptor d = linkage.getDescriptor(); MetaAccessProvider metaAccess = providers.getMetaAccess(); Class<?>[] arguments = d.getArgumentTypes(); JavaType[] parameters = new JavaType[arguments.length]; for (int i = 0; i < arguments.length; i++) { parameters[i] = metaAccess.lookupJavaType(arguments[i]); } return new HotSpotSignature(metaAccess.lookupJavaType(d.getResultType()), parameters); } public String getName() { return linkage.getDescriptor().getName(); } public JavaType getDeclaringClass() { return providers.getMetaAccess().lookupJavaType(ForeignCallStub.class); } @Override public String toString() { return format("ForeignCallStub<%n(%p)>", this); } }; } /** * Creates a graph for this stub. * <p> * If the stub returns an object, the graph created corresponds to this pseudo code: * * <pre> * Object foreignFunctionStub(args...) { * foreignFunction(currentThread, args); * if (clearPendingException(thread())) { * getAndClearObjectResult(thread()); * DeoptimizeCallerNode.deopt(InvalidateReprofile, RuntimeConstraint); * } * return verifyObject(getAndClearObjectResult(thread())); * } * </pre> * * If the stub returns a primitive or word, the graph created corresponds to this pseudo code * (using {@code int} as the primitive return type): * * <pre> * int foreignFunctionStub(args...) { * int result = foreignFunction(currentThread, args); * if (clearPendingException(thread())) { * DeoptimizeCallerNode.deopt(InvalidateReprofile, RuntimeConstraint); * } * return result; * } * </pre> * * If the stub is void, the graph created corresponds to this pseudo code: * * <pre> * void foreignFunctionStub(args...) { * foreignFunction(currentThread, args); * if (clearPendingException(thread())) { * DeoptimizeCallerNode.deopt(InvalidateReprofile, RuntimeConstraint); * } * } * </pre> * * In each example above, the {@code currentThread} argument is the C++ JavaThread value (i.e., * %r15 on AMD64) and is only prepended if {@link #prependThread} is true. */ @Override protected StructuredGraph getGraph() { Class<?>[] args = linkage.getDescriptor().getArgumentTypes(); boolean isObjectResult = linkage.getOutgoingCallingConvention().getReturn().getKind() == Kind.Object; StructuredGraph graph = new StructuredGraph(toString(), null); GraphKit kit = new GraphKit(graph, providers); ParameterNode[] params = createParameters(kit, args); ReadRegisterNode thread = kit.append(new ReadRegisterNode(providers.getRegisters().getThreadRegister(), true, false)); ValueNode result = createTargetCall(kit, params, thread); kit.createInvoke(StubUtil.class, "handlePendingException", thread, ConstantNode.forBoolean(isObjectResult, graph)); if (isObjectResult) { InvokeNode object = kit.createInvoke(HotSpotReplacementsUtil.class, "getAndClearObjectResult", thread); result = kit.createInvoke(StubUtil.class, "verifyObject", object); } kit.append(new ReturnNode(linkage.getDescriptor().getResultType() == void.class ? null : result)); if (Debug.isDumpEnabled()) { Debug.dump(graph, "Initial stub graph"); } kit.rewriteWordTypes(providers.getSnippetReflection()); kit.inlineInvokes(providers.getSnippetReflection()); if (Debug.isDumpEnabled()) { Debug.dump(graph, "Stub graph before compilation"); } return graph; } private ParameterNode[] createParameters(GraphKit kit, Class<?>[] args) { ParameterNode[] params = new ParameterNode[args.length]; ResolvedJavaType accessingClass = providers.getMetaAccess().lookupJavaType(getClass()); for (int i = 0; i < args.length; i++) { ResolvedJavaType type = providers.getMetaAccess().lookupJavaType(args[i]).resolve(accessingClass); Kind kind = type.getKind().getStackKind(); Stamp stamp; if (kind == Kind.Object) { stamp = StampFactory.declared(type); } else { stamp = StampFactory.forKind(type.getKind()); } ParameterNode param = kit.unique(new ParameterNode(i, stamp)); params[i] = param; } return params; } private StubForeignCallNode createTargetCall(GraphKit kit, ParameterNode[] params, ReadRegisterNode thread) { if (prependThread) { ValueNode[] targetArguments = new ValueNode[1 + params.length]; targetArguments[0] = thread; System.arraycopy(params, 0, targetArguments, 1, params.length); return kit.append(new StubForeignCallNode(providers.getForeignCalls(), target.getDescriptor(), targetArguments)); } else { return kit.append(new StubForeignCallNode(providers.getForeignCalls(), target.getDescriptor(), params)); } } }