Access BackendUsage through ClosedWorld

pkg/compiler/lib/src/js_backend/backend.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.
 
 library js_backend.backend;
 
 import '../common.dart';
 import '../common/backend_api.dart'
     show ForeignResolver, NativeRegistry, ImpactTransformer;
 import '../common/codegen.dart' show CodegenImpact, CodegenWorkItem;
@@ skipping 424 matching lines @@
   /// Interface for serialization of backend specific data.
   JavaScriptBackendSerialization serialization;
 
   NativeDataBuilderImpl _nativeDataBuilder;
   final NativeBasicDataBuilderImpl _nativeBasicDataBuilder =
       new NativeBasicDataBuilderImpl();
   NativeBasicDataImpl _nativeBasicData;
   NativeDataBuilder get nativeDataBuilder => _nativeDataBuilder;
   final NativeDataResolver _nativeDataResolver;
   OneShotInterceptorData _oneShotInterceptorData;
-  BackendUsage _backendUsage;
   BackendUsageBuilder _backendUsageBuilder;
   MirrorsDataImpl _mirrorsData;
   CheckedModeHelpers _checkedModeHelpers;
 
   final SuperMemberData superMemberData = new SuperMemberData();
 
   native.NativeResolutionEnqueuer _nativeResolutionEnqueuer;
   native.NativeCodegenEnqueuer _nativeCodegenEnqueuer;
 
   BackendImpacts impacts;
@@ skipping 45 matching lines @@
             compiler.frontEndStrategy.createRuntimeTypesNeedBuilder() {
     _target = new JavaScriptBackendTarget(this);
     impacts = new BackendImpacts(compiler.options, commonElements);
     _mirrorsData = compiler.frontEndStrategy.createMirrorsDataBuilder();
     _backendUsageBuilder = new BackendUsageBuilderImpl(commonElements);
     _checkedModeHelpers = new CheckedModeHelpers(commonElements);
     emitter =
         new CodeEmitterTask(compiler, generateSourceMap, useStartupEmitter);
 
     _typeVariableResolutionAnalysis = new TypeVariableResolutionAnalysis(
-        compiler.elementEnvironment, impacts, backendUsageBuilder);
+        compiler.elementEnvironment, impacts, _backendUsageBuilder);
     jsInteropAnalysis = new JsInteropAnalysis(this);
     _mirrorsResolutionAnalysis =
         compiler.frontEndStrategy.createMirrorsResolutionAnalysis(this);
     lookupMapResolutionAnalysis =
         new LookupMapResolutionAnalysis(reporter, compiler.elementEnvironment);
 
     noSuchMethodRegistry = new NoSuchMethodRegistry(
         commonElements, compiler.frontEndStrategy.createNoSuchMethodResolver());
     kernelTask = new KernelTask(compiler);
     patchResolverTask = new PatchResolverTask(compiler);
@@ skipping 77 matching lines @@
         message: "LookupMapAnalysis has not been created yet."));
     return _lookupMapAnalysis;
   }
 
   OneShotInterceptorData get oneShotInterceptorData {
     assert(invariant(NO_LOCATION_SPANNABLE, _oneShotInterceptorData != null,
         message: "OneShotInterceptorData has not been prepared yet."));
     return _oneShotInterceptorData;
   }
 
-  BackendUsage get backendUsage {
-    assert(invariant(NO_LOCATION_SPANNABLE, _backendUsage != null,
-        message: "BackendUsage has not been computed yet."));
-    return _backendUsage;
-  }
-
-  BackendUsageBuilder get backendUsageBuilder {
-    assert(invariant(NO_LOCATION_SPANNABLE, _backendUsage == null,
-        message: "BackendUsage has already been computed."));
-    return _backendUsageBuilder;
-  }
-
   RuntimeTypesNeed get rtiNeed {
     assert(invariant(NO_LOCATION_SPANNABLE, _rtiNeed != null,
         message: "RuntimeTypesNeed has not been computed yet."));
     return _rtiNeed;
   }
 
   RuntimeTypesNeedBuilder get rtiNeedBuilder {
     assert(invariant(NO_LOCATION_SPANNABLE, _rtiNeed == null,
         message: "RuntimeTypesNeed has already been computed."));
     return _rtiNeedBuilder;
@@ skipping 53 matching lines @@
             ? new FrequencyBasedNamer(closedWorld, codegenWorldBuilder)
             : new MinifyNamer(closedWorld, codegenWorldBuilder)
         : new Namer(closedWorld, codegenWorldBuilder);
   }
 
   /// Returns true if global optimizations such as type inferencing can apply to
   /// the field [element].
   ///
   /// One category of elements that do not apply is runtime helpers that the
   /// backend calls, but the optimizations don't see those calls.
-  bool canFieldBeUsedForGlobalOptimizations(FieldElement element) {
-    return !backendUsage.isFieldUsedByBackend(element) &&
+  bool canFieldBeUsedForGlobalOptimizations(
+      FieldElement element, ClosedWorld closedWorld) {
+    return !closedWorld.backendUsage.isFieldUsedByBackend(element) &&
         !mirrorsData.invokedReflectively(element);
   }
 
   /// Returns true if global optimizations such as type inferencing can apply to
   /// the parameter [element].
   ///
   /// One category of elements that do not apply is runtime helpers that the
   /// backend calls, but the optimizations don't see those calls.
   bool canFunctionParametersBeUsedForGlobalOptimizations(
-      FunctionElement element) {
+      FunctionElement element, ClosedWorld closedWorld) {
     if (element.isLocal) return true;
     MethodElement method = element;
-    return !backendUsage.isFunctionUsedByBackend(method) &&
+    return !closedWorld.backendUsage.isFunctionUsedByBackend(method) &&
         !mirrorsData.invokedReflectively(method);
   }
 
   /// Maps compile-time classes to their runtime class.  The runtime class is
   /// always a superclass or the class itself.
   ClassElement getRuntimeClass(ClassElement class_) {
     if (class_.isSubclassOf(commonElements.jsIntClass))
       return commonElements.jsIntClass;
     if (class_.isSubclassOf(commonElements.jsArrayClass))
       return commonElements.jsArrayClass;
@@ skipping 36 matching lines @@
     validateInterceptorImplementsAllObjectMethods(
         commonElements.jsInterceptorClass);
     // The null-interceptor must also implement *all* methods.
     validateInterceptorImplementsAllObjectMethods(commonElements.jsNullClass);
   }
 
   /// Called when the resolution queue has been closed.
   void onResolutionEnd() {
     compiler.frontEndStrategy.annotationProcesser
         .processJsInteropAnnotations(nativeBasicData, nativeDataBuilder);
-    _backendUsage = backendUsageBuilder.close();
   }
 
   /// Called when the closed world from resolution has been computed.
   void onResolutionClosedWorld(
       ClosedWorld closedWorld, ClosedWorldRefiner closedWorldRefiner) {
     for (MemberEntity entity
         in compiler.enqueuer.resolution.processedEntities) {
       processAnnotations(entity, closedWorldRefiner);
     }
     mirrorsDataBuilder.computeMembersNeededForReflection(
         compiler.enqueuer.resolution.worldBuilder, closedWorld);
     _rtiNeed = rtiNeedBuilder.computeRuntimeTypesNeed(
-        compiler.enqueuer.resolution.worldBuilder,
-        closedWorld,
-        compiler.types,
-        commonElements,
-        _backendUsage,
+        compiler.enqueuer.resolution.worldBuilder, closedWorld, compiler.types,
         enableTypeAssertions: compiler.options.enableTypeAssertions);
     mirrorsResolutionAnalysis.onResolutionComplete();
   }
 
   void onTypeInferenceComplete(GlobalTypeInferenceResults results) {
     noSuchMethodRegistry.onTypeInferenceComplete(results);
   }
 
   /// Called when resolving a call to a foreign function.
   native.NativeBehavior resolveForeignCall(Send node, Element element,
@@ skipping 29 matching lines @@
 
   ResolutionEnqueuer createResolutionEnqueuer(
       CompilerTask task, Compiler compiler) {
     _nativeBasicData =
         nativeBasicDataBuilder.close(compiler.elementEnvironment);
     _nativeResolutionEnqueuer = new native.NativeResolutionEnqueuer(
         compiler.options,
         compiler.elementEnvironment,
         commonElements,
         compiler.frontEndStrategy.dartTypes,
-        backendUsageBuilder,
+        _backendUsageBuilder,
         compiler.frontEndStrategy.createNativeClassFinder(nativeBasicData));
     _nativeDataBuilder = new NativeDataBuilderImpl(nativeBasicData);
     _customElementsResolutionAnalysis = compiler.frontEndStrategy
         .createCustomElementsResolutionAnalysis(
-            nativeBasicData, backendUsageBuilder);
+            nativeBasicData, _backendUsageBuilder);
     impactTransformer = new JavaScriptImpactTransformer(
         compiler.options,
         compiler.elementEnvironment,
         commonElements,
         impacts,
         nativeBasicData,
         _nativeResolutionEnqueuer,
-        backendUsageBuilder,
+        _backendUsageBuilder,
         mirrorsDataBuilder,
         customElementsResolutionAnalysis,
         rtiNeedBuilder);
     InterceptorDataBuilder interceptorDataBuilder =
         new InterceptorDataBuilderImpl(
             nativeBasicData, compiler.elementEnvironment, commonElements);
     return new ResolutionEnqueuer(
         task,
         compiler.options,
         compiler.reporter,
         compiler.options.analyzeOnly && compiler.options.analyzeMain
             ? const DirectEnqueuerStrategy()
             : const TreeShakingEnqueuerStrategy(),
         new ResolutionEnqueuerListener(
             compiler.options,
             compiler.elementEnvironment,
             commonElements,
             impacts,
             nativeBasicData,
             interceptorDataBuilder,
-            backendUsageBuilder,
+            _backendUsageBuilder,
             rtiNeedBuilder,
             mirrorsDataBuilder,
             noSuchMethodRegistry,
             customElementsResolutionAnalysis,
             lookupMapResolutionAnalysis,
             mirrorsResolutionAnalysis,
             typeVariableResolutionAnalysis,
             _nativeResolutionEnqueuer,
             compiler.deferredLoadTask,
             kernelTask),
         compiler.frontEndStrategy.createResolutionWorldBuilder(
             nativeBasicData,
             _nativeDataBuilder,
             interceptorDataBuilder,
+            _backendUsageBuilder,
             const OpenWorldStrategy()),
         compiler.frontEndStrategy.createResolutionWorkItemBuilder(
             nativeBasicData, _nativeDataBuilder, impactTransformer));
   }
 
   /// Creates an [Enqueuer] for code generation specific to this backend.
   CodegenEnqueuer createCodegenEnqueuer(
       CompilerTask task, Compiler compiler, ClosedWorld closedWorld) {
     _typeVariableCodegenAnalysis = new TypeVariableCodegenAnalysis(
         compiler.elementEnvironment, this, commonElements, mirrorsData);
@@ skipping 19 matching lines @@
         task,
         compiler.options,
         const TreeShakingEnqueuerStrategy(),
         new CodegenWorldBuilderImpl(
             nativeBasicData, closedWorld, constants, const TypeMaskStrategy()),
         new CodegenWorkItemBuilder(this, closedWorld, compiler.options),
         new CodegenEnqueuerListener(
             compiler.elementEnvironment,
             commonElements,
             impacts,
-            backendUsage,
+            closedWorld.backendUsage,
             rtiNeed,
             customElementsCodegenAnalysis,
             typeVariableCodegenAnalysis,
             lookupMapAnalysis,
             mirrorsCodegenAnalysis,
             nativeCodegenEnqueuer));
   }
 
   WorldImpact codegen(CodegenWorkItem work, ClosedWorld closedWorld) {
     MemberElement element = work.element;
@@ skipping 195 matching lines @@
     _rtiEncoder =
         _namer.rtiEncoder = new _RuntimeTypesEncoder(namer, commonElements);
     emitter.createEmitter(namer, closedWorld, codegenWorldBuilder);
     _codegenImpactTransformer = new CodegenImpactTransformer(
         compiler.options,
         compiler.elementEnvironment,
         commonElements,
         impacts,
         checkedModeHelpers,
         closedWorld.nativeData,
-        backendUsage,
+        closedWorld.backendUsage,
         rtiNeed,
         nativeCodegenEnqueuer,
         namer,
         oneShotInterceptorData,
         lookupMapAnalysis,
         rtiChecksBuilder);
     return const WorldImpact();
   }
 
   /// Called when code generation has been completed.
@@ skipping 302 matching lines @@
 
   bool canUseAliasedSuperMember(MemberEntity member, Selector selector) {
     return !selector.isGetter;
   }
 
   /// Returns `true` if [member] is called from a subclass via `super`.
   bool isAliasedSuperMember(MemberEntity member) {
     return _aliasedSuperMembers.contains(member);
   }
 }