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/*
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* Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jshell;
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import java.util.ArrayList;
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import java.util.Collection;
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import java.util.Collections;
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import java.util.LinkedHashSet;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.stream.Stream;
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import com.sun.jdi.ReferenceType;
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import jdk.jshell.Snippet.Kind;
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import jdk.jshell.Snippet.Status;
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import jdk.jshell.Snippet.SubKind;
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import jdk.jshell.TaskFactory.AnalyzeTask;
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import jdk.jshell.ClassTracker.ClassInfo;
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import jdk.jshell.TaskFactory.CompileTask;
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import static java.util.stream.Collectors.toList;
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import static java.util.stream.Collectors.toMap;
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import static java.util.stream.Collectors.toSet;
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import static jdk.internal.jshell.debug.InternalDebugControl.DBG_EVNT;
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import static jdk.internal.jshell.debug.InternalDebugControl.DBG_GEN;
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import static jdk.jshell.Snippet.Status.OVERWRITTEN;
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import static jdk.jshell.Snippet.Status.RECOVERABLE_DEFINED;
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import static jdk.jshell.Snippet.Status.RECOVERABLE_NOT_DEFINED;
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import static jdk.jshell.Snippet.Status.REJECTED;
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import static jdk.jshell.Snippet.Status.VALID;
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import static jdk.jshell.Util.expunge;
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/**
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* Tracks the compilation and load of a new or updated snippet.
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* @author Robert Field
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*/
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final class Unit {
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private final JShell state;
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private final Snippet si;
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private final Snippet siOld;
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private final boolean isDependency;
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private final boolean isNew;
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private final Snippet causalSnippet;
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private final DiagList generatedDiagnostics;
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private int seq;
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private int seqInitial;
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private Wrap activeGuts;
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private Status status;
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private Status prevStatus;
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private boolean signatureChanged;
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private DiagList compilationDiagnostics;
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private DiagList recompilationDiagnostics = null;
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private List<String> unresolved;
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private SnippetEvent replaceOldEvent;
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private List<SnippetEvent> secondaryEvents;
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private boolean isAttemptingCorral;
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private List<ClassInfo> toRedefine;
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private boolean dependenciesNeeded;
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Unit(JShell state, Snippet si, Snippet causalSnippet,
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DiagList generatedDiagnostics) {
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this.state = state;
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this.si = si;
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this.isDependency = causalSnippet != null;
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this.siOld = isDependency
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? si
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: state.maps.getSnippet(si.key());
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this.isNew = siOld == null;
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this.causalSnippet = causalSnippet;
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this.generatedDiagnostics = generatedDiagnostics;
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this.seq = isNew? 0 : siOld.sequenceNumber();
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this.seqInitial = seq;
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this.prevStatus = (isNew || isDependency)
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? si.status()
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: siOld.status();
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si.setSequenceNumber(seq);
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}
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// Drop entry
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Unit(JShell state, Snippet si) {
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this.state = state;
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this.si = si;
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this.siOld = null;
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this.isDependency = false;
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this.isNew = false;
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this.causalSnippet = null;
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this.generatedDiagnostics = new DiagList();
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this.prevStatus = si.status();
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si.setDropped();
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this.status = si.status();
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}
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@Override
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public int hashCode() {
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return si.hashCode();
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}
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@Override
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public boolean equals(Object o) {
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return (o instanceof Unit)
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? si.equals(((Unit) o).si)
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: false;
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}
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Snippet snippet() {
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return si;
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}
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boolean isDependency() {
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return isDependency;
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}
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boolean isNew() {
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return isNew;
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}
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boolean isRedundant() {
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return !isNew && !isDependency() && !si.isExecutable() &&
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prevStatus.isDefined &&
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siOld.source().equals(si.source());
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}
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void initialize(Collection<Unit> working) {
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isAttemptingCorral = false;
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dependenciesNeeded = false;
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toRedefine = null; // assure NPE if classToLoad not called
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activeGuts = si.guts();
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markOldDeclarationOverwritten();
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setWrap(working, working);
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}
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void setWrap(Collection<Unit> except, Collection<Unit> plus) {
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si.setOuterWrap(isImport()
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? OuterWrap.wrapImport(si.source(), activeGuts)
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: state.eval.wrapInClass(si,
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except.stream().map(u -> u.snippet().key()).collect(toSet()),
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activeGuts,
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plus.stream().map(u -> u.snippet())
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.filter(sn -> sn != si)
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.collect(toList())));
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}
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void setDiagnostics(AnalyzeTask ct) {
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setDiagnostics(ct.getDiagnostics().ofUnit(this));
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}
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void setDiagnostics(DiagList diags) {
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compilationDiagnostics = diags;
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UnresolvedExtractor ue = new UnresolvedExtractor(diags);
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unresolved = ue.unresolved();
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state.debug(DBG_GEN, "++setCompilationInfo() %s\n%s\n-- diags: %s\n",
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si, si.outerWrap().wrapped(), diags);
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}
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private boolean isRecoverable() {
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// Unit failed, use corralling if it is defined on this Snippet,
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// and either all the errors are resolution errors or this is a
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// redeclare of an existing method
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return compilationDiagnostics.hasErrors()
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&& si instanceof DeclarationSnippet
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&& (isDependency()
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|| (si.subKind() != SubKind.VAR_DECLARATION_WITH_INITIALIZER_SUBKIND
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&& compilationDiagnostics.hasResolutionErrorsAndNoOthers()));
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}
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/**
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* If it meets the conditions for corralling, install the corralled wrap
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* @return true is the corralled wrap was installed
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*/
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boolean corralIfNeeded(Collection<Unit> working) {
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if (isRecoverable()
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&& si.corralled() != null) {
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activeGuts = si.corralled();
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setWrap(working, working);
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return isAttemptingCorral = true;
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}
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return isAttemptingCorral = false;
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}
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void setCorralledDiagnostics(AnalyzeTask cct) {
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// set corralled diagnostics, but don't reset unresolved
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recompilationDiagnostics = cct.getDiagnostics().ofUnit(this);
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state.debug(DBG_GEN, "++recomp %s\n%s\n-- diags: %s\n",
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si, si.outerWrap().wrapped(), recompilationDiagnostics);
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}
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boolean smashingErrorDiagnostics(CompileTask ct) {
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if (isDefined()) {
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// set corralled diagnostics, but don't reset unresolved
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DiagList dl = ct.getDiagnostics().ofUnit(this);
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if (dl.hasErrors()) {
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setDiagnostics(dl);
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status = RECOVERABLE_NOT_DEFINED;
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// overwrite orginal bytes
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state.debug(DBG_GEN, "++smashingErrorDiagnostics %s\n%s\n-- diags: %s\n",
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si, si.outerWrap().wrapped(), dl);
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return true;
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}
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}
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return false;
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}
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void setStatus() {
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if (!compilationDiagnostics.hasErrors()) {
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status = VALID;
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} else if (isRecoverable()) {
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if (isAttemptingCorral && !recompilationDiagnostics.hasErrors()) {
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status = RECOVERABLE_DEFINED;
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} else {
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status = RECOVERABLE_NOT_DEFINED;
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}
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} else {
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status = REJECTED;
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}
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checkForOverwrite();
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state.debug(DBG_GEN, "setStatus() %s - status: %s\n",
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si, status);
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}
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/**
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* Must be called for each unit
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* @return
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*/
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boolean isDefined() {
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return status.isDefined;
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}
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/**
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* Process the class information from the last compile.
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* Requires loading of returned list.
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* @return the list of classes to load
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*/
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Stream<ClassInfo> classesToLoad(List<ClassInfo> cil) {
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toRedefine = new ArrayList<>();
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List<ClassInfo> toLoad = new ArrayList<>();
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if (status.isDefined && !isImport()) {
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cil.stream().forEach(ci -> {
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if (!ci.isLoaded()) {
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if (ci.getReferenceTypeOrNull() == null) {
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toLoad.add(ci);
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ci.setLoaded();
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dependenciesNeeded = true;
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} else {
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toRedefine.add(ci);
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}
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}
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});
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}
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return toLoad.stream();
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}
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/**
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* Redefine classes needing redefine.
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* classesToLoad() must be called first.
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* @return true if all redefines succeeded (can be vacuously true)
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*/
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boolean doRedefines() {
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if (toRedefine.isEmpty()) {
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return true;
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}
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Map<ReferenceType, byte[]> mp = toRedefine.stream()
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.collect(toMap(ci -> ci.getReferenceTypeOrNull(), ci -> ci.getBytes()));
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if (state.executionControl().commandRedefine(mp)) {
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// success, mark as loaded
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toRedefine.stream().forEach(ci -> ci.setLoaded());
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return true;
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} else {
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// failed to redefine
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return false;
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}
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}
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void markForReplacement() {
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// increment for replace class wrapper
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si.setSequenceNumber(++seq);
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}
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private boolean isImport() {
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return si.kind() == Kind.IMPORT;
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}
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private boolean sigChanged() {
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return (status.isDefined != prevStatus.isDefined)
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|| (seq != seqInitial && status.isDefined)
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|| signatureChanged;
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}
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Stream<Unit> effectedDependents() {
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return sigChanged() || dependenciesNeeded || status == RECOVERABLE_NOT_DEFINED
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? dependents()
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: Stream.empty();
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}
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Stream<Unit> dependents() {
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return state.maps.getDependents(si)
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.stream()
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.filter(xsi -> xsi != si && xsi.status().isActive)
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.map(xsi -> new Unit(state, xsi, si, new DiagList()));
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}
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void finish() {
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recordCompilation();
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state.maps.installSnippet(si);
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}
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private void markOldDeclarationOverwritten() {
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if (si != siOld && siOld != null && siOld.status().isActive) {
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// Mark the old declaraion as replaced
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replaceOldEvent = new SnippetEvent(siOld,
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siOld.status(), OVERWRITTEN,
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false, si, null, null);
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siOld.setOverwritten();
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}
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}
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private DiagList computeDiagnostics() {
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DiagList diagnostics = new DiagList();
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DiagList diags = compilationDiagnostics;
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if (status == RECOVERABLE_DEFINED || status == RECOVERABLE_NOT_DEFINED) {
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UnresolvedExtractor ue = new UnresolvedExtractor(diags);
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diagnostics.addAll(ue.otherAll());
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} else {
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unresolved = Collections.emptyList();
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diagnostics.addAll(diags);
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}
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diagnostics.addAll(generatedDiagnostics);
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return diagnostics;
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}
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private void recordCompilation() {
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state.maps.mapDependencies(si);
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DiagList diags = computeDiagnostics();
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si.setCompilationStatus(status, unresolved, diags);
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state.debug(DBG_GEN, "recordCompilation: %s -- status %s, unresolved %s\n",
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si, status, unresolved);
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}
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private void checkForOverwrite() {
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secondaryEvents = new ArrayList<>();
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if (replaceOldEvent != null) secondaryEvents.add(replaceOldEvent);
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// Defined methods can overwrite methods of other (equivalent) snippets
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if (si.kind() == Kind.METHOD && status.isDefined) {
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String oqpt = ((MethodSnippet) si).qualifiedParameterTypes();
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String nqpt = computeQualifiedParameterTypes(si);
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if (!nqpt.equals(oqpt)) {
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((MethodSnippet) si).setQualifiedParamaterTypes(nqpt);
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Status overwrittenStatus = overwriteMatchingMethod(si);
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if (overwrittenStatus != null) {
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prevStatus = overwrittenStatus;
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signatureChanged = true;
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}
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}
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}
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}
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// Check if there is a method whose user-declared parameter types are
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// different (and thus has a different snippet) but whose compiled parameter
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// types are the same. if so, consider it an overwrite replacement.
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private Status overwriteMatchingMethod(Snippet si) {
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String qpt = ((MethodSnippet) si).qualifiedParameterTypes();
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// Look through all methods for a method of the same name, with the
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// same computed qualified parameter types
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Status overwrittenStatus = null;
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for (MethodSnippet sn : state.methods()) {
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if (sn != null && sn != si && sn.status().isActive && sn.name().equals(si.name())) {
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if (qpt.equals(sn.qualifiedParameterTypes())) {
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overwrittenStatus = sn.status();
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SnippetEvent se = new SnippetEvent(
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sn, overwrittenStatus, OVERWRITTEN,
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false, si, null, null);
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sn.setOverwritten();
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secondaryEvents.add(se);
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state.debug(DBG_EVNT,
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"Overwrite event #%d -- key: %s before: %s status: %s sig: %b cause: %s\n",
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secondaryEvents.size(), se.snippet(), se.previousStatus(),
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se.status(), se.isSignatureChange(), se.causeSnippet());
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}
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}
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}
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return overwrittenStatus;
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}
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private String computeQualifiedParameterTypes(Snippet si) {
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MethodSnippet msi = (MethodSnippet) si;
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String qpt;
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AnalyzeTask at = state.taskFactory.new AnalyzeTask(msi.outerWrap());
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String rawSig = new TreeDissector(at).typeOfMethod();
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416 |
String signature = expunge(rawSig);
|
|
417 |
int paren = signature.lastIndexOf(')');
|
|
418 |
if (paren < 0) {
|
|
419 |
// Uncompilable snippet, punt with user parameter types
|
|
420 |
qpt = msi.parameterTypes();
|
|
421 |
} else {
|
|
422 |
qpt = signature.substring(0, paren + 1);
|
|
423 |
}
|
|
424 |
return qpt;
|
|
425 |
}
|
|
426 |
|
|
427 |
SnippetEvent event(String value, Exception exception) {
|
|
428 |
boolean wasSignatureChanged = sigChanged();
|
|
429 |
state.debug(DBG_EVNT, "Snippet: %s id: %s before: %s status: %s sig: %b cause: %s\n",
|
|
430 |
si, si.id(), prevStatus, si.status(), wasSignatureChanged, causalSnippet);
|
|
431 |
return new SnippetEvent(si, prevStatus, si.status(),
|
|
432 |
wasSignatureChanged, causalSnippet, value, exception);
|
|
433 |
}
|
|
434 |
|
|
435 |
List<SnippetEvent> secondaryEvents() {
|
|
436 |
return secondaryEvents;
|
|
437 |
}
|
|
438 |
|
|
439 |
@Override
|
|
440 |
public String toString() {
|
|
441 |
return "Unit(" + si.name() + ")";
|
|
442 |
}
|
|
443 |
|
|
444 |
/**
|
|
445 |
* Separate out the unresolvedDependencies errors from both the other
|
|
446 |
* corralling errors and the overall errors.
|
|
447 |
*/
|
|
448 |
private static class UnresolvedExtractor {
|
|
449 |
|
|
450 |
private static final String RESOLVE_ERROR_SYMBOL = "symbol:";
|
|
451 |
private static final String RESOLVE_ERROR_LOCATION = "location:";
|
|
452 |
|
|
453 |
//TODO extract from tree instead -- note: internationalization
|
|
454 |
private final Set<String> unresolved = new LinkedHashSet<>();
|
|
455 |
private final DiagList otherErrors = new DiagList();
|
|
456 |
private final DiagList otherAll = new DiagList();
|
|
457 |
|
|
458 |
UnresolvedExtractor(DiagList diags) {
|
|
459 |
for (Diag diag : diags) {
|
|
460 |
if (diag.isError()) {
|
|
461 |
if (diag.isResolutionError()) {
|
|
462 |
String m = diag.getMessage(null);
|
|
463 |
int symPos = m.indexOf(RESOLVE_ERROR_SYMBOL);
|
|
464 |
if (symPos >= 0) {
|
|
465 |
m = m.substring(symPos + RESOLVE_ERROR_SYMBOL.length());
|
|
466 |
int symLoc = m.indexOf(RESOLVE_ERROR_LOCATION);
|
|
467 |
if (symLoc >= 0) {
|
|
468 |
m = m.substring(0, symLoc);
|
|
469 |
}
|
|
470 |
m = m.trim();
|
|
471 |
unresolved.add(m);
|
|
472 |
continue;
|
|
473 |
}
|
|
474 |
}
|
|
475 |
otherErrors.add(diag);
|
|
476 |
}
|
|
477 |
otherAll.add(diag);
|
|
478 |
}
|
|
479 |
}
|
|
480 |
|
|
481 |
DiagList otherCorralledErrors() {
|
|
482 |
return otherErrors;
|
|
483 |
}
|
|
484 |
|
|
485 |
DiagList otherAll() {
|
|
486 |
return otherAll;
|
|
487 |
}
|
|
488 |
|
|
489 |
List<String> unresolved() {
|
|
490 |
return new ArrayList<>(unresolved);
|
|
491 |
}
|
|
492 |
}
|
|
493 |
}
|