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/*
* Copyright (c) 2010, 2013, 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. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* 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.nashorn.internal.runtime;
import static jdk.nashorn.internal.lookup.Lookup.MH;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodHandles;
import java.lang.invoke.MethodType;
import jdk.nashorn.internal.codegen.Compiler;
import jdk.nashorn.internal.codegen.CompilerConstants;
import jdk.nashorn.internal.codegen.FunctionSignature;
import jdk.nashorn.internal.ir.FunctionNode;
import jdk.nashorn.internal.ir.FunctionNode.CompilationState;
import jdk.nashorn.internal.parser.Token;
import jdk.nashorn.internal.parser.TokenType;
/**
* This is a subclass that represents a script function that may be regenerated,
* for example with specialization based on call site types, or lazily generated.
* The common denominator is that it can get new invokers during its lifespan,
* unlike {@link FinalScriptFunctionData}
*/
public final class RecompilableScriptFunctionData extends ScriptFunctionData {
private FunctionNode functionNode;
private final PropertyMap allocatorMap;
private final CodeInstaller<ScriptEnvironment> installer;
private final String allocatorClassName;
/** lazily generated allocator */
private MethodHandle allocator;
private static final MethodHandles.Lookup LOOKUP = MethodHandles.lookup();
/**
* Constructor - public as scripts use it
*
* @param functionNode functionNode that represents this function code
* @param installer installer for code regeneration versions of this function
* @param allocatorClassName name of our allocator class, will be looked up dynamically if used as a constructor
* @param allocatorMap allocator map to seed instances with, when constructing
*/
public RecompilableScriptFunctionData(final FunctionNode functionNode, final CodeInstaller<ScriptEnvironment> installer, final String allocatorClassName, final PropertyMap allocatorMap) {
super(functionNode.isAnonymous() ?
"" :
functionNode.getIdent().getName(),
functionNode.getParameters().size(),
functionNode.isStrict(),
false,
true);
this.functionNode = functionNode;
this.installer = installer;
this.allocatorClassName = allocatorClassName;
this.allocatorMap = allocatorMap;
}
@Override
String toSource() {
final Source source = functionNode.getSource();
final long token = tokenFor(functionNode);
if (source != null && token != 0) {
return source.getString(Token.descPosition(token), Token.descLength(token));
}
return "function " + (name == null ? "" : name) + "() { [native code] }";
}
@Override
public String toString() {
final StringBuilder sb = new StringBuilder();
final Source source = functionNode.getSource();
final long token = tokenFor(functionNode);
if (source != null) {
sb.append(source.getName())
.append(':')
.append(source.getLine(Token.descPosition(token)))
.append(' ');
}
return sb.toString() + super.toString();
}
private static long tokenFor(final FunctionNode fn) {
final int position = Token.descPosition(fn.getFirstToken());
final int length = Token.descPosition(fn.getLastToken()) - position + Token.descLength(fn.getLastToken());
return Token.toDesc(TokenType.FUNCTION, position, length);
}
@Override
ScriptObject allocate() {
try {
ensureHasAllocator(); //if allocatorClass name is set to null (e.g. for bound functions) we don't even try
return allocator == null ? null : (ScriptObject)allocator.invokeExact(allocatorMap);
} catch (final RuntimeException | Error e) {
throw e;
} catch (final Throwable t) {
throw new RuntimeException(t);
}
}
private void ensureHasAllocator() throws ClassNotFoundException {
if (allocator == null && allocatorClassName != null) {
this.allocator = MH.findStatic(LOOKUP, Context.forStructureClass(allocatorClassName), CompilerConstants.ALLOCATE.symbolName(), MH.type(ScriptObject.class, PropertyMap.class));
}
}
@Override
protected void ensureCodeGenerated() {
if (!code.isEmpty()) {
return; // nothing to do, we have code, at least some.
}
// check if function node is lazy, need to compile it.
// note that currently function cloning is not working completely, which
// means that the compiler will mutate the function node it has been given
// once it has been compiled, it cannot be recompiled. This means that
// lazy compilation works (not compiled yet) but e.g. specializations won't
// until the copy-on-write changes for IR are in, making cloning meaningless.
// therefore, currently method specialization is disabled. TODO
if (functionNode.isLazy()) {
Compiler.LOG.info("Trampoline hit: need to do lazy compilation of '", functionNode.getName(), "'");
final Compiler compiler = new Compiler(installer, functionNode);
functionNode = compiler.compile();
assert !functionNode.isLazy();
compiler.install();
// we don't need to update any flags - varArgs and needsCallee are instrincic
// in the function world we need to get a destination node from the compile instead
// and replace it with our function node. TODO
}
// we can't get here unless we have bytecode, either from eager compilation or from
// running a lazy compile on the lines above
assert functionNode.hasState(CompilationState.EMITTED) : functionNode.getName() + " " + functionNode.getState() + " " + Debug.id(functionNode);
// code exists - look it up and add it into the automatically sorted invoker list
code.add(
new CompiledFunction(
MH.findStatic(
LOOKUP,
functionNode.getCompileUnit().getCode(),
functionNode.getName(),
new FunctionSignature(functionNode).
getMethodType())));
}
@Override
MethodHandle getBestInvoker(final MethodType callSiteType, final Object[] args) {
final MethodHandle mh = super.getBestInvoker(callSiteType, args);
if (code.isLessSpecificThan(callSiteType)) {
// opportunity for code specialization - we can regenerate a better version of this method
}
return mh;
}
}
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