Recompile unit with potential conflict/dependency on some top-level symbol.

compiler/java/com/google/dart/compiler/LibraryDeps.java

Index: compiler/java/com/google/dart/compiler/LibraryDeps.java
diff --git a/compiler/java/com/google/dart/compiler/LibraryDeps.java b/compiler/java/com/google/dart/compiler/LibraryDeps.java
index a1ec4a0100a090927911a18d2104c2d28c682903..7d37a3108f545d0c707f5563de89b3a7af04a280 100644
--- a/compiler/java/com/google/dart/compiler/LibraryDeps.java
+++ b/compiler/java/com/google/dart/compiler/LibraryDeps.java
@@ -1,188 +1,276 @@
 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
-
 package com.google.dart.compiler;
 
+import com.google.common.base.Objects;
+import com.google.common.base.Splitter;
+import com.google.common.base.Strings;
+import com.google.common.collect.Iterables;
+import com.google.common.collect.Maps;
+import com.google.common.collect.Sets;
 import com.google.dart.compiler.ast.DartUnit;
 
 import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.Reader;
-import java.io.StringWriter;
 import java.io.Writer;
 import java.net.URI;
-import java.net.URISyntaxException;
-import java.util.ArrayList;
-import java.util.Collections;
+import java.util.List;
 import java.util.Map;
-import java.util.concurrent.ConcurrentHashMap;
+import java.util.Map.Entry;
+import java.util.Set;
 
 /**
  * Represents a library's dependencies artifact.
  */
 public class LibraryDeps {
+  private static final String VERSION = "v00001";
 
   /**
-   * Each dependency record contains the library in which it was found, along with a hash of its
-   * structure. Any change in the hash of the target dependency will force a recompile of the
-   * associated compilation unit.
+   * Each dependency record contains the library in which it was found, name of the unit in this
+   * library and last-modified timestamp. Any change in the timestamp of the target dependency will
+   * force a recompile of the associated compilation unit.
    */
   public static class Dependency {
     private final URI libUri;
-    private final String hash;
+    private final String unitName;
+    private final long lastModified;
 
-    public Dependency(URI libUri, String hash) {
+    public Dependency(URI libUri, String unitName, long lastModified) {
       this.libUri = libUri;
-      this.hash = hash;
+      this.unitName = unitName;
+      this.lastModified = lastModified;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+      if (obj instanceof Dependency) {
+        Dependency dep = (Dependency) obj;
+        return Objects.equal(libUri, dep.libUri) && Objects.equal(unitName, dep.unitName);
+      }
+      return false;
     }
 
-    public String getHash() {
-      return hash;
+    @Override
+    public int hashCode() {
+      return Objects.hashCode(libUri, unitName);
     }
 
     public URI getLibUri() {
       return libUri;
     }
+
+    public String getUnitName() {
+      return unitName;
+    }
+
+    public long getLastModified() {
+      return lastModified;
+    }
   }
 
-  /**
-   * Each source is a map from class names to its associated {@link Dependency}.
-   * 
-   * A special dependency entry, called a 'hole', represents a name that, if
-   * newly-defined in the library scope, will force a recompile of the unit.
-   * This is represented by the static constant {@link Source#HOLE}.
-   */
   public static class Source {
-    private final Map<String, Dependency> deps = new ConcurrentHashMap<String, Dependency>();
-    private final static Dependency HOLE = new Dependency(null, null);
+    private final Set<Dependency> deps = Sets.newHashSet();
+    private final Set<String> topSymbols = Sets.newHashSet();
+    private final Set<String> allSymbols = Sets.newHashSet();
+    private boolean shouldRecompileOnAnyTopLevelChange = false;
 
     /**
-     * Gets the node names of all dependencies for this source.
+     * @return the {@link Set} of {@link Dependency}s.
      */
-    public Iterable<String> getNodeNames() {
-      return deps.keySet();
+    public Set<Dependency> getDeps() {
+      return deps;
     }
 
-    public void putDependency(String nodeName, Dependency dep) {
-      deps.put(nodeName, dep);
+    /**
+     * @return the names of top-level elements, such as methods and classes.
+     */
+    public Set<String> getTopSymbols() {
+      return topSymbols;
     }
 
-    public Dependency getDependency(String nodeName) {
-      return deps.get(nodeName);
+    /**
+     * @return the names of all elements in unit, such as names of local variables, fields, etc.
+     */
+    public Set<String> getAllSymbols() {
+      return allSymbols;
     }
 
-    public void putHole(String nodeName) {
-      deps.put(nodeName, HOLE);
+    /**
+     * @return <code>true</code> if this unit should be recompiled on any change in the set of
+     *         top-level symbols. Typically unit has compilation errors, which potentially may be
+     *         fixed, so we should recompile this unit.
+     */
+    public boolean shouldRecompileOnAnyTopLevelChange() {
+      return shouldRecompileOnAnyTopLevelChange;
     }
 
-    public boolean isHole(String nodeName) {
-      return deps.containsKey(nodeName) && (deps.get(nodeName) == HOLE);
+    /**
+     * Adds symbol to the {@link Set} of top symbols.
+     */
+    public void addTopSymbol(String symbol) {
+      if (!Strings.isNullOrEmpty(symbol)) {
+        topSymbols.add(symbol);
+      }
+    }
+
+    /**
+     * Adds symbol to the {@link Set} of all symbols.
+     */
+    public void addAllSymbol(String symbol) {
+      allSymbols.add(symbol);
     }
   }
 
-  public static LibraryDeps fromReader(Reader reader) throws IOException {
+  public static LibraryDeps fromReader(Reader reader) {
+    try {
+      return fromReaderEx(reader);
+    } catch (Throwable e) {
+      return null;
+    }
+  }
+
+  private static LibraryDeps fromReaderEx(Reader reader) throws Exception {
     LibraryDeps deps = new LibraryDeps();
     BufferedReader buf = new BufferedReader(reader);
-    String srcName;
-    while (null != (srcName = buf.readLine())) {
-      Source src = new Source();
-
-      String line;
-      while (null != (line = buf.readLine())) {
-        // Blank line: next source.
+    // Check version.
+    {
+      String line = buf.readLine();
+      if (!Objects.equal(line, VERSION)) {
+        return deps;
+      }
+    }
+    // Read units dependencies.
+    String relPath;
+    while (null != (relPath = buf.readLine())) {
+      Source source = new Source();
+      // Read flags.
+      source.shouldRecompileOnAnyTopLevelChange = Boolean.parseBoolean(buf.readLine());
+      // Read top symbols.
+      {
+        String line = buf.readLine();
+        Iterable<String> topSymbols = Splitter.on(' ').omitEmptyStrings().split(line);
+        Iterables.addAll(source.topSymbols, topSymbols);
+      }
+      // Read all symbols.
+      {
+        String line = buf.readLine();
+        Iterable<String> allSymbols = Splitter.on(' ').omitEmptyStrings().split(line);
+        Iterables.addAll(source.allSymbols, allSymbols);
+      }
+      // Read dependencies.
+      while (true) {
+        String line = buf.readLine();
+        // Blank line: next unit.
         if (line.length() == 0) {
           break;
         }
-
+        // Parse line.
         String[] parts = line.split(" ");
-        switch (parts.length) {
-          case 3:
-            // Full dependency.
-            try {
-              src.deps.put(parts[0], new Dependency(new URI(parts[1]), parts[2]));
-            } catch (URISyntaxException e) {
-              return null;
-            }
-            break;
-          case 1:
-            // Name only: hole.
-            src.deps.put(parts[0], Source.HOLE);
-            break;
-          default:
-            return null;
-        }
+        source.deps.add(new Dependency(new URI(parts[0]), parts[1], Long.parseLong(parts[2])));
       }
-
-      deps.sources.put(srcName, src);
+      // Remember dependencies for current unit.
+      deps.sources.put(relPath, source);
     }
-
     return deps;
   }
 
-  private final Map<String, Source> sources = new ConcurrentHashMap<String, Source>();
+  private final Map<String, Source> sources = Maps.newHashMap();
 
   public LibraryDeps() {
   }
 
-  public Source getSource(String sourceName) {
-    return sources.get(sourceName);
+  /**
+   * @return the relative paths of all units with remembered dependencies.
+   */
+  public Set<String> getUnitPaths() {
+    return sources.keySet();
   }
 
-  public Iterable<String> getSourceNames() {
-    return sources.keySet();
+  /**
+   * @return all {@link Source} descriptions for all units in this library.
+   */
+  public Iterable<Source> getSources() {
+    return sources.values();
   }
 
-  public void setSource(String sourceName, Source source) {
-    sources.put(sourceName, source);
+  /**
+   * @return the {@link Source} description of the unit with given path.
+   */
+  public Source getSource(String relPath) {
+    return sources.get(relPath);
   }
 
-  @Override
-  public String toString() {
-    try {
-      StringWriter writer = new StringWriter();
-      write(writer);
-      return writer.toString();
-    } catch (IOException e) {
-      throw new AssertionError();
-    }
+  /**
+   * Remembers {@link Dependency}s of the unit with given path.
+   */
+  public void putSource(String relPath, Source source) {
+    sources.put(relPath, source);
   }
 
-  public void update(DartUnit unit, DartCompilerContext context) {
-    // Update the library deps to reflect this unit's classes.
-    LibraryDepsVisitor.exec(unit, this);
+  /**
+   * Update the library dependencies to reflect this unit's classes.
+   */
+  public void update(DartCompilerMainContext context, DartUnit unit) {
+    Source source = new Source();
+    String relPath = unit.getSource().getRelativePath();
+    putSource(relPath, source);
+    // Remember dependencies.
+    LibraryDepsVisitor.exec(unit, source);
+    // Fill Source with symbols.
+    for (String name : unit.getDeclarationNames()) {
+      source.addAllSymbol(name);
+    }
+    for (String name : unit.getTopDeclarationNames()) {
+      source.addTopSymbol(name);
+    }
+    // Analyze errors and see if any of them should force recompilation.
+    List<DartCompilationError> sourceErrors = context.getSourceErrors(unit.getSource());
+    for (DartCompilationError error : sourceErrors) {
+      if (error.getErrorCode().needsRecompilation()) {
+        source.shouldRecompileOnAnyTopLevelChange = true;
+        break;
+      }
+    }
   }
 
   public void write(Writer writer) throws IOException {
-    // For stability from run to run, this output needs to be sorted
-    ArrayList<String> sortedSourceNames = new ArrayList<String>(sources.size());
-    sortedSourceNames.addAll(sources.keySet());
-    Collections.sort(sortedSourceNames);
-    
-    for (String srcName : sortedSourceNames) {
-      writer.write(srcName);
+    // Write version.
+    writer.write(VERSION);
+    writer.write('\n');
+    // Write entries.
+    for (Entry<String, Source> entry : sources.entrySet()) {
+      String relPath = entry.getKey();
+      Source source = entry.getValue();
+      // Unit name.
+      writer.write(relPath);
       writer.write('\n');
-      Source src = sources.get(srcName);
-      
-      // sort the types per source name
-      ArrayList<String> sortedTypes = new ArrayList<String>(src.deps.size());
-      sortedTypes.addAll(src.deps.keySet());
-      Collections.sort(sortedTypes);
-      
-      for (String type : sortedTypes) {
-        writer.write(type);
-
-        Dependency dep = src.getDependency(type);
-        if (dep != Source.HOLE) {
-          writer.write(' ');
-          writer.write(dep.libUri.toString());
-          writer.write(' ');
-          writer.write(dep.hash);
-        }
-
+      // Flags.
+      writer.write(Boolean.toString(source.shouldRecompileOnAnyTopLevelChange));
+      writer.write('\n');
+      // Write top symbols.
+      for (String symbol : source.topSymbols) {
+        writer.write(symbol);
+        writer.write(' ');
+      }
+      writer.write('\n');
+      // Write all symbols.
+      for (String symbol : source.allSymbols) {
+        writer.write(symbol);
+        writer.write(' ');
+      }
+      writer.write('\n');
+      // Write dependencies.
+      for (Dependency dep : source.deps) {
+        writer.write(dep.libUri.toString());
+        writer.write(' ');
+        writer.write(dep.unitName);
+        writer.write(' ');
+        writer.write(Long.toString(dep.lastModified));
         writer.write('\n');
       }
-
+      // Empty line after each unit.
       writer.write('\n');
     }
   }