Compute Compiler.proxyConstant on demand.

pkg/compiler/lib/src/ssa/nodes.dart

Index: pkg/compiler/lib/src/ssa/nodes.dart
diff --git a/pkg/compiler/lib/src/ssa/nodes.dart b/pkg/compiler/lib/src/ssa/nodes.dart
index dfcc4d367582ad41324d5bee88c4b651fb8e5c41..fdaef0179507644c4b9fdd3a92cd9c95fdf48bcd 100644
--- a/pkg/compiler/lib/src/ssa/nodes.dart
+++ b/pkg/compiler/lib/src/ssa/nodes.dart
@@ -882,6 +882,32 @@ abstract class HInstruction implements Spannable {
     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)
@@ -895,27 +921,28 @@ abstract class HInstruction implements Spannable {
     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);
   }
 
@@ -923,37 +950,43 @@ abstract class HInstruction implements Spannable {
     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);
   }
 
@@ -962,7 +995,7 @@ abstract class HInstruction implements Spannable {
   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) {
@@ -975,27 +1008,28 @@ abstract class HInstruction implements Spannable {
     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) {