Update README.md comments concerning constants.
The existing comments contain references to abstractions (constant system) and implementations
(dart2dart constant folding), which no longer exist.
Change-Id: Iaea64225ec82a12333e791fbb1df0ed5c70c8757
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/166141
Commit-Queue: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>
diff --git a/pkg/compiler/README.md b/pkg/compiler/README.md
index f4e2a49..6c9621a 100644
--- a/pkg/compiler/README.md
+++ b/pkg/compiler/README.md
@@ -327,36 +327,14 @@
AI: consider deleting this file.
-* Constants: the compiler has a constant system that delays evaluation of
- constants and provides different semantics depending on the embedder, this
- abstraction was especially necessary when dart2js was used as a front-end for
- non-JS systems like dart2dart and dartino.
+* Constants: the compiler has a constant system that evaluates constant
+ expressions based on JS semantics.
* `lib/src/constants/value.dart`: this is the represented value of a constant
- after it has been evaluated. The resulting value is specific to the target
- of the compiler and will no longer have environment placeholders. For
- example, when the target is Dart (dart2dart) `1 == 1.0` is evaluated to
- `false`, and when the target is JavaScript it is evaluated to `true`. This
- specific example is a result of the way dart2js compiles numbers as
- JavaScript Numbers.
+ after it has been evaluated.
- * `lib/src/constants/constant_system.dart`: an abstraction that defines how
- expressions may be folded. Different implementations of the constant system
- are used to target Dart or JavaScript.
-
- * `lib/src/compile_time_constants.dart`: defines how constant expressions are
- created from a parsed AST.
-
- * `lib/src/constant_system_dart.dart`: defines an implementation of a constant
- system with the Dart semantics (where `1 == 1.0` is true).
-
- * `lib/src/js_backend/constant_system_javascript.dart`: defines an
- implementation of a constant system with the JavaScript semantics (where
- `1 == 1.0` is false).
-
- AI: consider deleting `constant_system_dart.dart` now that it is no longer
- used, or move under testing, if it might be used for unittests of the constant
- expressions.
+ * `lib/src/constants/constant_system.dart`: implements evaluating constant
+ Dart expressions and produces values.
* Common elements: the compiler often refers to certain elements during
compilation either because they are first-class in the language or because
