org.mozilla.javascript.optimizer.ClassCompiler Maven / Gradle / Ivy
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript.optimizer;
import org.mozilla.javascript.CompilerEnvirons;
import org.mozilla.javascript.IRFactory;
import org.mozilla.javascript.JavaAdapter;
import org.mozilla.javascript.ObjToIntMap;
import org.mozilla.javascript.Parser;
import org.mozilla.javascript.ScriptRuntime;
import org.mozilla.javascript.ast.AstRoot;
import org.mozilla.javascript.ast.FunctionNode;
import org.mozilla.javascript.ast.ScriptNode;
/**
* Generates class files from script sources.
*
* since 1.5 Release 5
*
* @author Igor Bukanov
*/
public class ClassCompiler {
/**
* Construct ClassCompiler that uses the specified compiler environment when generating classes.
*/
public ClassCompiler(CompilerEnvirons compilerEnv) {
if (compilerEnv == null) throw new IllegalArgumentException();
this.compilerEnv = compilerEnv;
this.mainMethodClassName = Codegen.DEFAULT_MAIN_METHOD_CLASS;
}
/**
* Set the class name to use for main method implementation. The class must have a method
* matching public static void main(Script sc, String[] args), it will be called
* when main(String[] args) is called in the generated class. The class name should
* be fully qulified name and include the package name like in org.foo.Bar.
*/
public void setMainMethodClass(String className) {
// XXX Should this check for a valid class name?
mainMethodClassName = className;
}
/**
* Get the name of the class for main method implementation.
*
* @see #setMainMethodClass(String)
*/
public String getMainMethodClass() {
return mainMethodClassName;
}
/** Get the compiler environment the compiler uses. */
public CompilerEnvirons getCompilerEnv() {
return compilerEnv;
}
/** Get the class that the generated target will extend. */
public Class getTargetExtends() {
return targetExtends;
}
/**
* Set the class that the generated target will extend.
*
* @param extendsClass the class it extends
*/
public void setTargetExtends(Class extendsClass) {
targetExtends = extendsClass;
}
/** Get the interfaces that the generated target will implement. */
public Class[] getTargetImplements() {
return targetImplements == null ? null : targetImplements.clone();
}
/**
* Set the interfaces that the generated target will implement.
*
* @param implementsClasses an array of Class objects, one for each interface the target will
* extend
*/
public void setTargetImplements(Class[] implementsClasses) {
targetImplements = implementsClasses == null ? null : implementsClasses.clone();
}
/**
* Build class name for a auxiliary class generated by compiler. If the compiler needs to
* generate extra classes beyond the main class, it will call this function to build the
* auxiliary class name. The default implementation simply appends auxMarker to mainClassName
* but this can be overridden.
*/
protected String makeAuxiliaryClassName(String mainClassName, String auxMarker) {
return mainClassName + auxMarker;
}
/**
* Compile JavaScript source into one or more Java class files. The first compiled class will
* have name mainClassName. If the results of {@link #getTargetExtends()} or {@link
* #getTargetImplements()} are not null, then the first compiled class will extend the specified
* super class and implement specified interfaces.
*
* @return array where elements with even indexes specifies class name and the following odd
* index gives class file body as byte[] array. The initial element of the array always
* holds mainClassName and array[1] holds its byte code.
*/
public Object[] compileToClassFiles(
String source, String sourceLocation, int lineno, String mainClassName) {
Parser p = new Parser(compilerEnv);
AstRoot ast = p.parse(source, sourceLocation, lineno);
IRFactory irf = new IRFactory(compilerEnv);
ScriptNode tree = irf.transformTree(ast);
// release reference to original parse tree & parser
irf = null;
ast = null;
p = null;
Class superClass = getTargetExtends();
Class[] interfaces = getTargetImplements();
String scriptClassName;
boolean isPrimary = (interfaces == null && superClass == null);
if (isPrimary) {
scriptClassName = mainClassName;
} else {
scriptClassName = makeAuxiliaryClassName(mainClassName, "1");
}
Codegen codegen = new Codegen();
codegen.setMainMethodClass(mainMethodClassName);
byte[] scriptClassBytes =
codegen.compileToClassFile(
compilerEnv, scriptClassName, tree, tree.getEncodedSource(), false);
if (isPrimary) {
return new Object[] {scriptClassName, scriptClassBytes};
}
int functionCount = tree.getFunctionCount();
ObjToIntMap functionNames = new ObjToIntMap(functionCount);
for (int i = 0; i != functionCount; ++i) {
FunctionNode ofn = tree.getFunctionNode(i);
String name = ofn.getName();
if (name != null && name.length() != 0) {
functionNames.put(name, ofn.getParamCount());
}
}
if (superClass == null) {
superClass = ScriptRuntime.ObjectClass;
}
byte[] mainClassBytes =
JavaAdapter.createAdapterCode(
functionNames, mainClassName, superClass, interfaces, scriptClassName);
return new Object[] {
mainClassName, mainClassBytes,
scriptClassName, scriptClassBytes
};
}
private String mainMethodClassName;
private CompilerEnvirons compilerEnv;
private Class targetExtends;
private Class[] targetImplements;
}