mirror of
https://github.com/i-net-software/JWebAssembly.git
synced 2025-03-26 07:49:28 +01:00
473 lines
18 KiB
Java
473 lines
18 KiB
Java
/*
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* Copyright 2017 - 2019 Volker Berlin (i-net software)
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package de.inetsoftware.jwebassembly.module;
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import java.io.BufferedInputStream;
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import java.io.File;
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import java.io.IOException;
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import java.io.InputStream;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.util.ArrayList;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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import java.util.function.Consumer;
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import java.util.zip.ZipEntry;
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import java.util.zip.ZipInputStream;
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import javax.annotation.Nonnull;
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import de.inetsoftware.classparser.ClassFile;
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import de.inetsoftware.classparser.Code;
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import de.inetsoftware.classparser.FieldInfo;
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import de.inetsoftware.classparser.MethodInfo;
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import de.inetsoftware.jwebassembly.JWebAssembly;
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import de.inetsoftware.jwebassembly.WasmException;
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import de.inetsoftware.jwebassembly.module.TypeManager.StructType;
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import de.inetsoftware.jwebassembly.wasm.AnyType;
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import de.inetsoftware.jwebassembly.wasm.NamedStorageType;
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import de.inetsoftware.jwebassembly.wasm.ValueType;
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import de.inetsoftware.jwebassembly.wasm.ValueTypeParser;
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import de.inetsoftware.jwebassembly.watparser.WatParser;
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/**
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* Generate the WebAssembly output.
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*
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* @author Volker Berlin
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*/
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public class ModuleGenerator {
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private final ModuleWriter writer;
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private final URLClassLoader libraries;
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private final JavaMethodWasmCodeBuilder javaCodeBuilder = new JavaMethodWasmCodeBuilder();
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private final WatParser watParser = new WatParser();
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private String sourceFile;
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private String className;
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private FunctionManager functions = new FunctionManager();
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private TypeManager types = new TypeManager();
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private CodeOptimizer optimizer = new CodeOptimizer();
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/**
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* Create a new generator.
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*
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* @param writer
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* the target writer
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* @param libraries
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* libraries
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*/
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public ModuleGenerator( @Nonnull ModuleWriter writer, @Nonnull List<URL> libraries ) {
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this.writer = writer;
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this.libraries = new URLClassLoader( libraries.toArray( new URL[libraries.size()] ) );
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javaCodeBuilder.init( types );
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((WasmCodeBuilder)watParser).init( types );
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scanLibraries( libraries );
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}
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/**
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* Scan the libraries for annotated methods
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*
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* @param libraries
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* libraries
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*/
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private void scanLibraries( @Nonnull List<URL> libraries ) {
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// search for replacement methods in the libraries
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for( URL url : libraries ) {
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try {
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File file = new File(url.toURI());
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if( file.isDirectory() ) {
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for( Iterator<Path> iterator = Files.walk( file.toPath() ).iterator(); iterator.hasNext(); ) {
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Path path = iterator.next();
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if( path.toString().endsWith( ".class" ) ) {
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ClassFile classFile = new ClassFile( new BufferedInputStream( Files.newInputStream( path ) ) );
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prepare( classFile );
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}
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}
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}
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} catch( Exception e ) {
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e.printStackTrace();
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}
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try (ZipInputStream input = new ZipInputStream( url.openStream() )) {
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do {
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ZipEntry entry = input.getNextEntry();
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if( entry == null ) {
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break;
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}
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if( entry.getName().endsWith( ".class" ) ) {
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ClassFile classFile = new ClassFile( new BufferedInputStream( input ) {
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@Override
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public void close() {
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} // does not close the zip stream
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} );
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prepare( classFile );
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}
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} while( true );
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} catch( IOException e ) {
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e.printStackTrace();
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}
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}
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}
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/**
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* Prepare the content of the class.
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*
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* @param classFile
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* the class file
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* @throws WasmException
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* if some Java code can't converted
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*/
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public void prepare( ClassFile classFile ) {
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iterateMethods( classFile, m -> prepareMethod( m ) );
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}
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/**
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* Finish the prepare after all classes/methods are prepare. This must be call before we can start with write the
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* first method.
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*/
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public void prepareFinish() {
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writer.prepareFinish();
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}
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/**
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* Finish the code generation.
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*
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* @throws IOException
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* if any I/O error occur
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*/
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public void finish() throws IOException {
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FunctionName next;
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while( (next = functions.nextWriteLater()) != null ) {
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InputStream stream = libraries.getResourceAsStream( next.className + ".class" );
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if( stream == null ) {
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if( next instanceof SyntheticFunctionName ) {
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watParser.parse( ((SyntheticFunctionName)next).getCode(), -1 );
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writeMethodImpl( next, true, watParser );
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} else {
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throw new WasmException( "Missing function: " + next.signatureName, -1 );
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}
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} else {
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ClassFile classFile = new ClassFile( stream );
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iterateMethods( classFile, method -> {
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try {
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FunctionName name;
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Map<String, Object> wat = method.getAnnotation( JWebAssembly.TEXTCODE_ANNOTATION );
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if( wat != null ) {
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String signature = (String)wat.get( "signature" );
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if( signature == null ) {
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signature = method.getType();
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}
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name = new FunctionName( method, signature );
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} else {
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name = new FunctionName( method );
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method = functions.replace( name, method );
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}
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if( functions.isToWrite( name ) ) {
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writeMethod( name, method );
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}
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} catch (IOException ioex){
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throw WasmException.create( ioex, sourceFile, className, -1 );
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}
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} );
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}
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if( functions.isToWrite( next ) ) {
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throw new WasmException( "Missing function: " + next.signatureName, -1 );
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}
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}
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}
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/**
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* Set the StructType into the instruction and write the types/structs if needed.
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*
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* @param instruction
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* the struct instruction
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* @throws IOException
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* if any I/O error occur
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*/
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private void setStructType( WasmStructInstruction instruction ) throws IOException {
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StructType type = instruction.getStructType();
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if( type != null && type.getCode() == Integer.MAX_VALUE ) {
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writeStructType( type );
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}
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}
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/**
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* Write the struct type
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*
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* @param type
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* the type
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* @throws IOException
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* if any I/O error occur
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*/
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private void writeStructType( StructType type ) throws IOException {
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String className = type.getName();
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InputStream stream = libraries.getResourceAsStream( className + ".class" );
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if( stream == null ) {
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throw new WasmException( "Missing class: " + className, -1 );
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}
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ClassFile classFile = new ClassFile( stream );
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List<NamedStorageType> list = new ArrayList<>();
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FieldInfo[] fields = classFile.getFields();
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for( FieldInfo field : fields ) {
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if( field.isStatic() ) {
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continue;
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}
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AnyType fieldtype = new ValueTypeParser( field.getType(), types ).next();
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list.add( new NamedStorageType( fieldtype, field.getName() ) );
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}
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int id = writer.writeStruct( className, list );
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types.useType( type, id );
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for( NamedStorageType namedType : list ) {
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if( namedType.type.getCode() == Integer.MAX_VALUE ) {
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writeStructType( (StructType)namedType.type );
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}
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}
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}
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/**
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* Iterate over all methods of the classFile and run the handler.
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*
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* @param classFile
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* the classFile
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* @param handler
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* the handler
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* @throws WasmException
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* if some Java code can't converted
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*/
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private void iterateMethods( ClassFile classFile, Consumer<MethodInfo> handler ) throws WasmException {
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sourceFile = null; // clear previous value for the case an IO exception occur
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className = null;
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try {
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sourceFile = classFile.getSourceFile();
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className = classFile.getThisClass().getName();
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MethodInfo[] methods = classFile.getMethods();
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for( MethodInfo method : methods ) {
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handler.accept( method );
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}
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} catch( IOException ioex ) {
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throw WasmException.create( ioex, sourceFile, className, -1 );
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}
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}
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/**
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* Prepare the method.
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*
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* @param method
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* the method
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* @throws WasmException
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* if some Java code can't converted
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*/
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private void prepareMethod( MethodInfo method ) throws WasmException {
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try {
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FunctionName name = new FunctionName( method );
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Map<String,Object> annotationValues;
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if( (annotationValues = method.getAnnotation( JWebAssembly.IMPORT_ANNOTATION )) != null ) {
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if( !method.isStatic() ) {
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throw new WasmException( "Import method must be static: " + name.fullName, -1 );
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}
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functions.writeFunction( name );
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String impoarModule = (String)annotationValues.get( "module" );
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String importName = (String)annotationValues.get( "name" );
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writer.prepareImport( name, impoarModule, importName );
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writeMethodSignature( name, true, null );
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return;
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}
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if( (annotationValues = method.getAnnotation( JWebAssembly.EXPORT_ANNOTATION )) != null ) {
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if( !method.isStatic() ) {
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throw new WasmException( "Export method must be static: " + name.fullName, -1 );
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}
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functions.functionCall( name );
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return;
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}
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if( (annotationValues = method.getAnnotation( JWebAssembly.REPLACE_ANNOTATION )) != null ) {
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String signatureName = (String)annotationValues.get( "value" );
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name = new FunctionName( signatureName );
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functions.addReplacement( name, method );
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return;
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}
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} catch( Exception ioex ) {
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throw WasmException.create( ioex, sourceFile, className, -1 );
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}
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}
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/**
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* Write the content of a method.
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*
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* @param name
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* the function name that should be written. This can be differ from the value in the MethodInfo
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* @param method
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* the method
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* @throws WasmException
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* if some Java code can't converted
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*/
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private void writeMethod( FunctionName name, MethodInfo method ) throws WasmException, IOException {
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Code code = null;
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try {
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if( method.getAnnotation( JWebAssembly.IMPORT_ANNOTATION ) != null ) {
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return;
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}
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WasmCodeBuilder codeBuilder;
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code = method.getCode();
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if( method.getAnnotation( JWebAssembly.TEXTCODE_ANNOTATION ) != null ) {
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Map<String, Object> wat = method.getAnnotation( JWebAssembly.TEXTCODE_ANNOTATION );
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String watCode = (String)wat.get( "value" );
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String signature = (String)wat.get( "signature" );
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if( signature == null ) {
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signature = method.getType();
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}
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watParser.parse( watCode, code == null ? -1 : code.getFirstLineNr() );
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codeBuilder = watParser;
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} else if( code != null ) { // abstract methods and interface methods does not have code
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javaCodeBuilder.buildCode( code, !method.getType().endsWith( ")V" ) );
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codeBuilder = javaCodeBuilder;
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} else {
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throw new WasmException( "Abstract or native method can not be used: " + name.fullName, -1 );
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}
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writeExport( name, method );
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writeMethodImpl( name, method.isStatic(), codeBuilder );
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} catch( Exception ioex ) {
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int lineNumber = code == null ? -1 : code.getFirstLineNr();
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throw WasmException.create( ioex, sourceFile, className, lineNumber );
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}
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}
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private void writeMethodImpl( FunctionName name, boolean isStatic, WasmCodeBuilder codeBuilder ) throws WasmException, IOException {
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writer.writeMethodStart( name, sourceFile );
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functions.writeFunction( name );
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writeMethodSignature( name, isStatic, codeBuilder );
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List<WasmInstruction> instructions = codeBuilder.getInstructions();
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optimizer.optimze( instructions );
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int lastJavaSourceLine = -1;
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for( WasmInstruction instruction : instructions ) {
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try {
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switch( instruction.getType() ) {
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case Block:
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switch( ((WasmBlockInstruction)instruction).getOperation() ) {
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case TRY:
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case CATCH:
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writer.writeException();
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break;
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default:
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}
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break;
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case Call:
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functions.functionCall( ((WasmCallInstruction)instruction).getFunctionName() );
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break;
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case Struct:
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setStructType( (WasmStructInstruction)instruction );
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break;
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default:
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}
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int javaSourceLine = instruction.getLineNumber();
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if( javaSourceLine >= 0 && javaSourceLine != lastJavaSourceLine ) {
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writer.markSourceLine( javaSourceLine );
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lastJavaSourceLine = javaSourceLine;
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}
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instruction.writeTo( writer );
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} catch( Throwable th ) {
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throw WasmException.create( th, instruction.getLineNumber() );
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}
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}
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writer.writeMethodFinish();
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}
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/**
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* Look for a Export annotation and if there write an export directive.
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*
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* @param name
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* the function name
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* @param method
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* the method
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*
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* @throws IOException
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* if any IOException occur
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*/
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private void writeExport( FunctionName name, MethodInfo method ) throws IOException {
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Map<String,Object> export = method.getAnnotation( JWebAssembly.EXPORT_ANNOTATION );
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if( export != null ) {
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String exportName = (String)export.get( "name" );
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if( exportName == null ) {
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exportName = method.getName(); // TODO naming conversion rule if no name was set
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}
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writer.writeExport( name, exportName );
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}
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}
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/**
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* Write the parameter and return signatures
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*
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* @param name
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* the Java signature, typical method.getType();
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* @param isStatic
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* if method is static
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* @param codeBuilder
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* the calculated variables
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* @throws IOException
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* if any I/O error occur
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* @throws WasmException
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* if some Java code can't converted
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*/
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private void writeMethodSignature( FunctionName name, boolean isStatic, WasmCodeBuilder codeBuilder ) throws IOException, WasmException {
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int paramCount = 0;
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if( !isStatic ) {
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writer.writeMethodParam( "param", ValueType.anyref, "this" );
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}
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Iterator<AnyType> parser = name.getSignature();
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AnyType type;
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for( String kind : new String[] {"param","result"}) {
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while( parser.hasNext() && (type = parser.next()) != null ) {
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String paramName = null;
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if( kind == "param" ) {
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if( codeBuilder != null ) {
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paramName = codeBuilder.getLocalName( paramCount );
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}
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paramCount++;
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}
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if( type != ValueType.empty ) {
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writer.writeMethodParam( kind, type, paramName );
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}
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}
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}
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if( codeBuilder != null ) {
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if( !isStatic ) {
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paramCount++;
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}
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List<AnyType> localTypes = codeBuilder.getLocalTypes( paramCount );
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for( int i = 0; i < localTypes.size(); i++ ) {
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type = localTypes.get( i );
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int idx = paramCount + i;
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String paramName = codeBuilder.getLocalName( idx );
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writer.writeMethodParam( "local", type, paramName );
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}
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}
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writer.writeMethodParamFinish( );
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}
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}
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