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A repackaged copy of javac for Error Prone to depend on
/*
* Copyright (c) 2014, 2017, 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.jshell;
import com.sun.source.tree.CompilationUnitTree;
import com.sun.source.tree.Tree;
import com.sun.source.util.Trees;
import com.sun.tools.javac.api.JavacTaskImpl;
import com.sun.tools.javac.api.JavacTool;
import com.sun.tools.javac.util.Context;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.tools.Diagnostic;
import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileManager;
import javax.tools.JavaFileObject;
import javax.tools.ToolProvider;
import static jdk.jshell.Util.*;
import com.sun.source.tree.ImportTree;
import com.sun.tools.javac.code.Types;
import com.sun.tools.javac.util.JavacMessages;
import jdk.jshell.MemoryFileManager.OutputMemoryJavaFileObject;
import java.util.Collections;
import java.util.Locale;
import static javax.tools.StandardLocation.CLASS_OUTPUT;
import static jdk.internal.jshell.debug.InternalDebugControl.DBG_GEN;
import java.io.File;
import java.util.Collection;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.Map;
import java.util.stream.Collectors;
import static java.util.stream.Collectors.toList;
import java.util.stream.Stream;
import javax.lang.model.util.Elements;
import javax.tools.FileObject;
import jdk.jshell.MemoryFileManager.SourceMemoryJavaFileObject;
import java.lang.Runtime.Version;
import com.sun.source.tree.Tree.Kind;
/**
* The primary interface to the compiler API. Parsing, analysis, and
* compilation to class files (in memory).
* @author Robert Field
*/
class TaskFactory {
private final JavaCompiler compiler;
private final MemoryFileManager fileManager;
private final JShell state;
private String classpath = System.getProperty("java.class.path");
private final static Version INITIAL_SUPPORTED_VER = Version.parse("9");
TaskFactory(JShell state) {
this.state = state;
this.compiler = ToolProvider.getSystemJavaCompiler();
if (compiler == null) {
throw new UnsupportedOperationException("Compiler not available, must be run with full JDK 9.");
}
Version current = Version.parse(System.getProperty("java.specification.version"));
if (INITIAL_SUPPORTED_VER.compareToIgnoreOptional(current) > 0) {
throw new UnsupportedOperationException("Wrong compiler, must be run with full JDK 9.");
}
this.fileManager = new MemoryFileManager(
compiler.getStandardFileManager(null, null, null), state);
}
void addToClasspath(String path) {
classpath = classpath + File.pathSeparator + path;
List args = new ArrayList<>();
args.add(classpath);
fileManager().handleOption("-classpath", args.iterator());
}
MemoryFileManager fileManager() {
return fileManager;
}
// Parse a snippet and return our parse task handler
ParseTask parse(final String source) {
ParseTask pt = state.taskFactory.new ParseTask(source, false);
if (!pt.units().isEmpty()
&& pt.units().get(0).getKind() == Kind.EXPRESSION_STATEMENT
&& pt.getDiagnostics().hasOtherThanNotStatementErrors()) {
// It failed, it may be an expression being incorrectly
// parsed as having a leading type variable, example: a < b
// Try forcing interpretation as an expression
ParseTask ept = state.taskFactory.new ParseTask(source, true);
if (!ept.getDiagnostics().hasOtherThanNotStatementErrors()) {
return ept;
}
}
return pt;
}
private interface SourceHandler {
JavaFileObject sourceToFileObject(MemoryFileManager fm, T t);
Diag diag(Diagnostic d);
}
private class StringSourceHandler implements SourceHandler {
@Override
public JavaFileObject sourceToFileObject(MemoryFileManager fm, String src) {
return fm.createSourceFileObject(src, "$NeverUsedName$", src);
}
@Override
public Diag diag(final Diagnostic d) {
return new Diag() {
@Override
public boolean isError() {
return d.getKind() == Diagnostic.Kind.ERROR;
}
@Override
public long getPosition() {
return d.getPosition();
}
@Override
public long getStartPosition() {
return d.getStartPosition();
}
@Override
public long getEndPosition() {
return d.getEndPosition();
}
@Override
public String getCode() {
return d.getCode();
}
@Override
public String getMessage(Locale locale) {
return expunge(d.getMessage(locale));
}
};
}
}
private class WrapSourceHandler implements SourceHandler {
@Override
public JavaFileObject sourceToFileObject(MemoryFileManager fm, OuterWrap w) {
return fm.createSourceFileObject(w, w.classFullName(), w.wrapped());
}
@Override
public Diag diag(Diagnostic d) {
SourceMemoryJavaFileObject smjfo = (SourceMemoryJavaFileObject) d.getSource();
if (smjfo == null) {
// Handle failure that doesn't preserve mapping
return new StringSourceHandler().diag(d);
}
OuterWrap w = (OuterWrap) smjfo.getOrigin();
return w.wrapDiag(d);
}
}
/**
* Parse a snippet of code (as a String) using the parser subclass. Return
* the parse tree (and errors).
*/
class ParseTask extends BaseTask {
private final Iterable cuts;
private final List units;
ParseTask(final String source, final boolean forceExpression) {
super(Stream.of(source),
new StringSourceHandler(),
"-XDallowStringFolding=false", "-proc:none");
ReplParserFactory.preRegister(getContext(), forceExpression);
cuts = parse();
units = Util.stream(cuts)
.flatMap(cut -> {
List imps = cut.getImports();
return (!imps.isEmpty() ? imps : cut.getTypeDecls()).stream();
})
.collect(toList());
}
private Iterable parse() {
try {
return task.parse();
} catch (Exception ex) {
throw new InternalError("Exception during parse - " + ex.getMessage(), ex);
}
}
List units() {
return units;
}
@Override
Iterable cuTrees() {
return cuts;
}
}
/**
* Run the normal "analyze()" pass of the compiler over the wrapped snippet.
*/
class AnalyzeTask extends BaseTask {
private final Iterable cuts;
AnalyzeTask(final OuterWrap wrap, String... extraArgs) {
this(Collections.singletonList(wrap), extraArgs);
}
AnalyzeTask(final Collection wraps, String... extraArgs) {
this(wraps.stream(),
new WrapSourceHandler(),
Util.join(new String[] {
"--should-stop:at=FLOW", "-Xlint:unchecked",
"-proc:none"
}, extraArgs));
}
private AnalyzeTask(final Stream stream, SourceHandler sourceHandler,
String... extraOptions) {
super(stream, sourceHandler, extraOptions);
cuts = analyze();
}
private Iterable analyze() {
try {
Iterable cuts = task.parse();
task.analyze();
return cuts;
} catch (Exception ex) {
throw new InternalError("Exception during analyze - " + ex.getMessage(), ex);
}
}
@Override
Iterable cuTrees() {
return cuts;
}
Elements getElements() {
return task.getElements();
}
javax.lang.model.util.Types getTypes() {
return task.getTypes();
}
}
/**
* Unit the wrapped snippet to class files.
*/
class CompileTask extends BaseTask {
private final Map> classObjs = new HashMap<>();
CompileTask(final Collection wraps) {
super(wraps.stream(), new WrapSourceHandler(),
"-Xlint:unchecked", "-proc:none", "-parameters");
}
boolean compile() {
fileManager.registerClassFileCreationListener(this::listenForNewClassFile);
boolean result = task.call();
fileManager.registerClassFileCreationListener(null);
return result;
}
// Returns the list of classes generated during this compile.
// Stores the mapping between class name and current compiled bytes.
List classList(OuterWrap w) {
List l = classObjs.get(w);
if (l == null) {
return Collections.emptyList();
}
List list = new ArrayList<>();
for (OutputMemoryJavaFileObject fo : l) {
state.classTracker.setCurrentBytes(fo.getName(), fo.getBytes());
list.add(fo.getName());
}
return list;
}
private void listenForNewClassFile(OutputMemoryJavaFileObject jfo, JavaFileManager.Location location,
String className, JavaFileObject.Kind kind, FileObject sibling) {
//debug("listenForNewClassFile %s loc=%s kind=%s\n", className, location, kind);
if (location == CLASS_OUTPUT) {
state.debug(DBG_GEN, "Compiler generating class %s\n", className);
OuterWrap w = ((sibling instanceof SourceMemoryJavaFileObject)
&& (((SourceMemoryJavaFileObject) sibling).getOrigin() instanceof OuterWrap))
? (OuterWrap) ((SourceMemoryJavaFileObject) sibling).getOrigin()
: null;
classObjs.compute(w, (k, v) -> (v == null)? new ArrayList<>() : v)
.add(jfo);
}
}
@Override
Iterable cuTrees() {
throw new UnsupportedOperationException("Not supported.");
}
}
abstract class BaseTask {
final DiagnosticCollector diagnostics = new DiagnosticCollector<>();
final JavacTaskImpl task;
private DiagList diags = null;
private final SourceHandler sourceHandler;
final Context context = new Context();
private Types types;
private JavacMessages messages;
private Trees trees;
private BaseTask(Stream inputs,
//BiFunction sfoCreator,
SourceHandler sh,
String... extraOptions) {
this.sourceHandler = sh;
List options = new ArrayList<>(extraOptions.length + state.extraCompilerOptions.size());
options.addAll(Arrays.asList(extraOptions));
options.addAll(state.extraCompilerOptions);
Iterable compilationUnits = inputs
.map(in -> sh.sourceToFileObject(fileManager, in))
.collect(Collectors.toList());
this.task = (JavacTaskImpl) ((JavacTool) compiler).getTask(null,
fileManager, diagnostics, options, null,
compilationUnits, context);
}
abstract Iterable cuTrees();
CompilationUnitTree firstCuTree() {
return cuTrees().iterator().next();
}
Diag diag(Diagnostic diag) {
return sourceHandler.diag(diag);
}
Context getContext() {
return context;
}
Types types() {
if (types == null) {
types = Types.instance(context);
}
return types;
}
JavacMessages messages() {
if (messages == null) {
messages = JavacMessages.instance(context);
}
return messages;
}
Trees trees() {
if (trees == null) {
trees = Trees.instance(task);
}
return trees;
}
// ------------------ diags functionality
DiagList getDiagnostics() {
if (diags == null) {
LinkedHashMap diagMap = new LinkedHashMap<>();
for (Diagnostic in : diagnostics.getDiagnostics()) {
Diag d = diag(in);
String uniqueKey = d.getCode() + ":" + d.getPosition() + ":" + d.getMessage(PARSED_LOCALE);
diagMap.put(uniqueKey, d);
}
diags = new DiagList(diagMap.values());
}
return diags;
}
boolean hasErrors() {
return getDiagnostics().hasErrors();
}
String shortErrorMessage() {
StringBuilder sb = new StringBuilder();
for (Diag diag : getDiagnostics()) {
for (String line : diag.getMessage(PARSED_LOCALE).split("\\r?\\n")) {
if (!line.trim().startsWith("location:")) {
sb.append(line);
}
}
}
return sb.toString();
}
void debugPrintDiagnostics(String src) {
for (Diag diag : getDiagnostics()) {
state.debug(DBG_GEN, "ERROR --\n");
for (String line : diag.getMessage(PARSED_LOCALE).split("\\r?\\n")) {
if (!line.trim().startsWith("location:")) {
state.debug(DBG_GEN, "%s\n", line);
}
}
int start = (int) diag.getStartPosition();
int end = (int) diag.getEndPosition();
if (src != null) {
String[] srcLines = src.split("\\r?\\n");
for (String line : srcLines) {
state.debug(DBG_GEN, "%s\n", line);
}
StringBuilder sb = new StringBuilder();
for (int i = 0; i < start; ++i) {
sb.append(' ');
}
sb.append('^');
if (end > start) {
for (int i = start + 1; i < end; ++i) {
sb.append('-');
}
sb.append('^');
}
state.debug(DBG_GEN, "%s\n", sb.toString());
}
state.debug(DBG_GEN, "printDiagnostics start-pos = %d ==> %d -- wrap = %s\n",
diag.getStartPosition(), start, this);
state.debug(DBG_GEN, "Code: %s\n", diag.getCode());
state.debug(DBG_GEN, "Pos: %d (%d - %d) -- %s\n", diag.getPosition(),
diag.getStartPosition(), diag.getEndPosition(), diag.getMessage(null));
}
}
}
}