Various caches for incremental compilation.

dart/sdk/lib/_internal/compiler/implementation/compiler.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 488 matching lines @@
 
   // TODO(johnniwinther): Change to map from [Uri] to [LibraryElement].
   final Map<String, LibraryElement> libraries =
     new Map<String, LibraryElement>();
   final Stopwatch totalCompileTime = new Stopwatch();
   int nextFreeClassId = 0;
   World world;
   String assembledCode;
   Types types;
 
+  final CacheStrategy cacheStrategy;
+
   /**
    * Map from token to the first preceeding comment token.
    */
   final TokenMap commentMap = new TokenMap();
 
   /**
    * Records global dependencies, that is, dependencies that don't
    * correspond to a particular element.
    *
    * We should get rid of this and ensure that all dependencies are
@@ skipping 74 matching lines @@
   /// `true` if the last diagnostic was filtered, in which case the
   /// accompanying info message should be filtered as well.
   bool lastDiagnosticWasFiltered = false;
 
   /// Map containing information about the warnings and hints that have been
   /// suppressed for each library.
   Map<Uri, SuppressionInfo> suppressedWarnings = <Uri, SuppressionInfo>{};
 
   final bool suppressWarnings;
 
+  /// If `true`, some values are cached for reuse in incremental compilation.
+  /// Incremental compilation is basically calling [run] more than once.
+  final bool hasIncrementalSupport;
+
   api.CompilerOutputProvider outputProvider;
 
   bool disableInlining = false;
 
   /// True if compilation was aborted with a [CompilerCancelledException]. Only
   /// set after Future retuned by [run] has completed.
   bool compilerWasCancelled = false;
 
   List<Uri> librariesToAnalyzeWhenRun;
 
@@ skipping 219 matching lines @@
             this.preserveComments: false,
             this.verbose: false,
             this.sourceMapUri: null,
             this.outputUri: null,
             this.buildId: UNDETERMINED_BUILD_ID,
             this.terseDiagnostics: false,
             this.dumpInfo: false,
             this.showPackageWarnings: false,
             this.useContentSecurityPolicy: false,
             this.suppressWarnings: false,
+            bool hasIncrementalSupport: false,
             outputProvider,
             List<String> strips: const []})
       : this.disableTypeInferenceFlag =
           disableTypeInferenceFlag || !emitJavaScript,
         this.analyzeOnly =
             analyzeOnly || analyzeSignaturesOnly || analyzeAllFlag,
         this.analyzeSignaturesOnly = analyzeSignaturesOnly,
         this.analyzeAllFlag = analyzeAllFlag,
+        this.hasIncrementalSupport = hasIncrementalSupport,
+        cacheStrategy = new CacheStrategy(hasIncrementalSupport),
         this.outputProvider = (outputProvider == null)
             ? NullSink.outputProvider
             : outputProvider {
     world = new World(this);
     types = new Types(this);
     tracer = new Tracer(this.outputProvider);
 
     closureMapping.ClosureNamer closureNamer;
     if (emitJavaScript) {
       js_backend.JavaScriptBackend jsBackend =
@@ skipping 1135 matching lines @@
   static NullSink outputProvider(String name, String extension) {
     return new NullSink('$name.$extension');
   }
 }
 
 /// Information about suppressed warnings and hints for a given library.
 class SuppressionInfo {
   int warnings = 0;
   int hints = 0;
 }