Compute Compiler.proxyConstant on demand.

pkg/compiler/lib/src/ssa/nodes.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 ssa;
 
 abstract class HVisitor<R> {
   R visitAdd(HAdd node);
   R visitAwait(HAwait node);
   R visitBitAnd(HBitAnd node);
@@ skipping 864 matching lines @@
 
   bool isExact() => instructionType.isExact || isNull();
 
   bool canBeNull() => instructionType.isNullable;
 
   bool isNull() => instructionType.isEmpty && instructionType.isNullable;
   bool isConflicting() {
     return instructionType.isEmpty && !instructionType.isNullable;
   }
 
+  /// Returns `true` if [typeMask] contains [cls].
+  static bool containsType(
+      TypeMask typeMask,
+      ClassElement cls,
+      ClassWorld classWorld) {
+    return classWorld.isInstantiated(cls) && typeMask.contains(cls, classWorld);
+  }
+
+  /// Returns `true` if [typeMask] contains only [cls].
+  static bool containsOnlyType(
+      TypeMask typeMask,
+      ClassElement cls,
+      ClassWorld classWorld) {
+    return classWorld.isInstantiated(cls) &&
+        typeMask.containsOnly(cls);
+  }
+
+  /// Returns `true` if [typeMask] is an instance of [cls].
+  static bool isInstanceOf(
+      TypeMask typeMask,
+      ClassElement cls,
+      ClassWorld classWorld) {
+    return classWorld.isInstantiated(cls) &&
+        typeMask.satisfies(cls, classWorld);
+  }
+
   bool canBePrimitive(Compiler compiler) {
     return canBePrimitiveNumber(compiler)
         || canBePrimitiveArray(compiler)
         || canBePrimitiveBoolean(compiler)
         || canBePrimitiveString(compiler)
         || isNull();
   }
 
   bool canBePrimitiveNumber(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
     // TODO(sra): It should be possible to test only jsDoubleClass and
     // jsUInt31Class, since all others are superclasses of these two.
-    return instructionType.contains(backend.jsNumberClass, classWorld)
-        || instructionType.contains(backend.jsIntClass, classWorld)
-        || instructionType.contains(backend.jsPositiveIntClass, classWorld)
-        || instructionType.contains(backend.jsUInt32Class, classWorld)
-        || instructionType.contains(backend.jsUInt31Class, classWorld)
-        || instructionType.contains(backend.jsDoubleClass, classWorld);
+    return containsType(instructionType, backend.jsNumberClass, classWorld)
+        || containsType(instructionType, backend.jsIntClass, classWorld)
+        || containsType(instructionType, backend.jsPositiveIntClass, classWorld)
+        || containsType(instructionType, backend.jsUInt32Class, classWorld)
+        || containsType(instructionType, backend.jsUInt31Class, classWorld)
+        || containsType(instructionType, backend.jsDoubleClass, classWorld);
   }
 
   bool canBePrimitiveBoolean(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return instructionType.contains(backend.jsBoolClass, classWorld);
+    return containsType(instructionType, backend.jsBoolClass, classWorld);
   }
 
   bool canBePrimitiveArray(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return instructionType.contains(backend.jsArrayClass, classWorld)
-        || instructionType.contains(backend.jsFixedArrayClass, classWorld)
-        || instructionType.contains(backend.jsExtendableArrayClass, classWorld)
-        || instructionType.contains(
+    return containsType(instructionType, backend.jsArrayClass, classWorld)
+        || containsType(instructionType, backend.jsFixedArrayClass, classWorld)
+        || containsType(
+            instructionType, backend.jsExtendableArrayClass, classWorld)
+        || containsType(instructionType,
             backend.jsUnmodifiableArrayClass, classWorld);
   }
 
   bool isIndexablePrimitive(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
     return instructionType.containsOnlyString(classWorld)
-        || instructionType.satisfies(backend.jsIndexableClass, classWorld);
+        || isInstanceOf(instructionType, backend.jsIndexableClass, classWorld);
   }
 
   bool isFixedArray(Compiler compiler) {
+    ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
     // TODO(sra): Recognize the union of these types as well.
-    return instructionType.containsOnly(backend.jsFixedArrayClass)
-        || instructionType.containsOnly(backend.jsUnmodifiableArrayClass);
+    return containsOnlyType(
+            instructionType, backend.jsFixedArrayClass, classWorld)
+        || containsOnlyType(
+            instructionType, backend.jsUnmodifiableArrayClass, classWorld);
   }
 
   bool isExtendableArray(Compiler compiler) {
+    ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return instructionType.containsOnly(backend.jsExtendableArrayClass);
+    return containsOnlyType(
+        instructionType, backend.jsExtendableArrayClass, classWorld);
   }
 
   bool isMutableArray(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return instructionType.satisfies(backend.jsMutableArrayClass, classWorld);
+    return isInstanceOf(
+        instructionType, backend.jsMutableArrayClass, classWorld);
   }
 
   bool isReadableArray(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return instructionType.satisfies(backend.jsArrayClass, classWorld);
+    return isInstanceOf(instructionType, backend.jsArrayClass, classWorld);
   }
 
   bool isMutableIndexable(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return instructionType.satisfies(
+    return isInstanceOf(instructionType,
         backend.jsMutableIndexableClass, classWorld);
   }
 
   bool isArray(Compiler compiler) => isReadableArray(compiler);
 
   bool canBePrimitiveString(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return instructionType.contains(backend.jsStringClass, classWorld);
+    return containsType(instructionType, backend.jsStringClass, classWorld);
   }
 
   bool isInteger(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     return instructionType.containsOnlyInt(classWorld)
         && !instructionType.isNullable;
   }
 
   bool isUInt32(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
     return !instructionType.isNullable
-        && instructionType.satisfies(backend.jsUInt32Class, classWorld);
+        && isInstanceOf(instructionType, backend.jsUInt32Class, classWorld);
   }
 
   bool isUInt31(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
     return !instructionType.isNullable
-        && instructionType.satisfies(backend.jsUInt31Class, classWorld);
+        && isInstanceOf(instructionType, backend.jsUInt31Class, classWorld);
   }
 
   bool isPositiveInteger(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return !instructionType.isNullable
-        && instructionType.satisfies(backend.jsPositiveIntClass, classWorld);
+    return !instructionType.isNullable &&
+        isInstanceOf(instructionType, backend.jsPositiveIntClass, classWorld);
   }
 
   bool isPositiveIntegerOrNull(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     JavaScriptBackend backend = compiler.backend;
-    return instructionType.satisfies(backend.jsPositiveIntClass, classWorld);
+    return isInstanceOf(
+        instructionType, backend.jsPositiveIntClass, classWorld);
   }
 
   bool isIntegerOrNull(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     return instructionType.containsOnlyInt(classWorld);
   }
 
   bool isNumber(Compiler compiler) {
     ClassWorld classWorld = compiler.world;
     return instructionType.containsOnlyNum(classWorld)
@@ skipping 2279 matching lines @@
 class HDynamicType extends HRuntimeType {
   HDynamicType(DynamicType dartType, TypeMask instructionType)
       : super(const <HInstruction>[], dartType, instructionType);
 
   accept(HVisitor visitor) => visitor.visitDynamicType(this);
 
   int typeCode() => HInstruction.DYNAMIC_TYPE_TYPECODE;
 
   bool typeEquals(HInstruction other) => other is HDynamicType;
 }