sdk/lib/_internal/compiler/implementation/types/types.dart - Issue 14997006: Introduce a UnionTypeMask, currently limited to 4 types.

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Unified Diff: sdk/lib/_internal/compiler/implementation/types/types.dart

Issue 14997006: Introduce a UnionTypeMask, currently limited to 4 types. (Closed) Base URL: http://dart.googlecode.com/svn/branches/bleeding_edge/dart/

Patch Set: Created 7 years, 7 months ago

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Index: sdk/lib/_internal/compiler/implementation/types/types.dart

===================================================================

--- sdk/lib/_internal/compiler/implementation/types/types.dart (revision 23010)

+++ sdk/lib/_internal/compiler/implementation/types/types.dart (working copy)

@@ -19,6 +19,7 @@

part 'concrete_types_inferrer.dart';

part 'flat_type_mask.dart';

part 'type_mask.dart';

+part 'union_type_mask.dart';

/**

* Common super class for our type inferrers.

@@ -91,6 +92,9 @@

* is for debugging purposes only and can be omitted.

TypeMask best(var type1, var type2, [element]) {

+ // TODO(polux): Handle [UnionTypeMask].

+ if (type1 != null) type1 = type1.simplify(compiler);

+ if (type2 != null) type2 = type2.simplify(compiler);

final result = _best(type1, type2);

// Tests type1 and type2 for equality modulo normalization of native types.

// Only called when DUMP_SURPRISING_RESULTS is true.