Move compile-time constant registrations to the backend.

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

Index: sdk/lib/_internal/compiler/implementation/constants.dart
diff --git a/sdk/lib/_internal/compiler/implementation/constants.dart b/sdk/lib/_internal/compiler/implementation/constants.dart
index bca652405c49be6b45649dac303a38a077fdd068..a8ac5241cc92a05e56122dc6ceffb33be09e837f 100644
--- a/sdk/lib/_internal/compiler/implementation/constants.dart
+++ b/sdk/lib/_internal/compiler/implementation/constants.dart
@@ -45,6 +45,7 @@ abstract class Constant {
   bool isNaN() => false;
   bool isMinusZero() => false;
 
+  // TODO(johnniwinther): Replace with a 'type' getter.
   DartType computeType(Compiler compiler);
 
   List<Constant> getDependencies();
@@ -295,6 +296,10 @@ class StringConstant extends PrimitiveConstant {
   int get length => value.length;
 
   accept(ConstantVisitor visitor) => visitor.visitString(this);
+
+  String toString() {
+    return 'StringConstant(${Error.safeToString(value.slowToString())})';
+  }
 }
 
 abstract class ObjectConstant extends Constant {
@@ -323,6 +328,8 @@ class TypeConstant extends ObjectConstant {
   List<Constant> getDependencies() => const <Constant>[];
 
   accept(ConstantVisitor visitor) => visitor.visitType(this);
+
+  String toString() => 'TypeConstant(${Error.safeToString(representedType)})';
 }
 
 class ListConstant extends ObjectConstant {
@@ -362,6 +369,17 @@ class ListConstant extends ObjectConstant {
   int get length => entries.length;
 
   accept(ConstantVisitor visitor) => visitor.visitList(this);
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    sb.write('ListConstant([');
+    for (int i = 0 ; i < entries.length ; i++) {
+      if (i > 0) sb.write(',');
+      sb.write(Error.safeToString(entries[i]));
+    }
+    sb.write('])');
+    return sb.toString();
+  }
 }
 
 class MapConstant extends ObjectConstant {
@@ -437,6 +455,19 @@ class MapConstant extends ObjectConstant {
   int get length => keys.length;
 
   accept(ConstantVisitor visitor) => visitor.visitMap(this);
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    sb.write('MapConstant({');
+    for (int i = 0 ; i < keys.entries.length ; i++) {
+      if (i > 0) sb.write(',');
+      sb.write(Error.safeToString(keys.entries[i]));
+      sb.write(':');
+      sb.write(Error.safeToString(values[i]));
+    }
+    sb.write('})');
+    return sb.toString();
+  }
 }
 
 class InterceptorConstant extends Constant {
@@ -460,6 +491,10 @@ class InterceptorConstant extends Constant {
   accept(ConstantVisitor visitor) => visitor.visitInterceptor(this);
 
   DartType computeType(Compiler compiler) => compiler.types.dynamicType;
+
+  String toString() {
+    return 'InterceptorConstant(${Error.safeToString(dispatchedType)})';
+  }
 }
 
 class ConstructedConstant extends ObjectConstant {
@@ -510,4 +545,21 @@ class ConstructedConstant extends ObjectConstant {
     }, includeSuperAndInjectedMembers: true);
     return result;
   }
+
+  String toString() {
+    StringBuffer sb = new StringBuffer();
+    sb.write('ConstructedConstant(');
+    sb.write(type);
+    sb.write('(');
+    int i = 0;
+    fieldElements.forEach((Element field, Constant value) {
+      if (i > 0) sb.write(',');
+      sb.write(Error.safeToString(field.name.slowToString()));
+      sb.write('=');
+      sb.write(Error.safeToString(value));
+      i++;
+    });
+    sb.write('))');
+    return sb.toString();
+  }
 }