Generate JS operators using helper functions with thunks for operands.

lib/compiler/implementation/ssa/codegen_helpers.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.
 
 /**
  * Instead of emitting each SSA instruction with a temporary variable
  * mark instructions that can be emitted at their use-site.
  * For example, in:
  *   t0 = 4;
  *   t1 = 3;
@@ skipping 323 matching lines @@
     "!==" : const JSBinaryOperatorPrecedence(EQUALITY_PRECEDENCE,
                                              RELATIONAL_PRECEDENCE),
     "<" : const JSBinaryOperatorPrecedence(RELATIONAL_PRECEDENCE,
                                            SHIFT_PRECEDENCE),
     ">" : const JSBinaryOperatorPrecedence(RELATIONAL_PRECEDENCE,
                                            SHIFT_PRECEDENCE),
     "<=" : const JSBinaryOperatorPrecedence(RELATIONAL_PRECEDENCE,
                                             SHIFT_PRECEDENCE),
     ">=" : const JSBinaryOperatorPrecedence(RELATIONAL_PRECEDENCE,
                                             SHIFT_PRECEDENCE),
+    "in": const JSBinaryOperatorPrecedence(RELATIONAL_PRECEDENCE,
+                                           SHIFT_PRECEDENCE),
+    "instanceof": const JSBinaryOperatorPrecedence(RELATIONAL_PRECEDENCE,
+                                                   SHIFT_PRECEDENCE),
     "<<" : const JSBinaryOperatorPrecedence(SHIFT_PRECEDENCE,
                                             ADDITIVE_PRECEDENCE),
     ">>" : const JSBinaryOperatorPrecedence(SHIFT_PRECEDENCE,
                                             ADDITIVE_PRECEDENCE),
     ">>>" : const JSBinaryOperatorPrecedence(SHIFT_PRECEDENCE,
                                              ADDITIVE_PRECEDENCE),
     "+" : const JSBinaryOperatorPrecedence(ADDITIVE_PRECEDENCE,
                                            MULTIPLICATIVE_PRECEDENCE),
     "-" : const JSBinaryOperatorPrecedence(ADDITIVE_PRECEDENCE,
                                            MULTIPLICATIVE_PRECEDENCE),
     "*" : const JSBinaryOperatorPrecedence(MULTIPLICATIVE_PRECEDENCE,
                                            PREFIX_PRECEDENCE),
     "/" : const JSBinaryOperatorPrecedence(MULTIPLICATIVE_PRECEDENCE,
                                            PREFIX_PRECEDENCE),
     "%" : const JSBinaryOperatorPrecedence(MULTIPLICATIVE_PRECEDENCE,
                                            PREFIX_PRECEDENCE),
+    // TODO(lrn): Consider changing rhs to EXPRESSION_PRECEDENCE.
+    ",": const JSBinaryOperatorPrecedence(EXPRESSION_PRECEDENCE,
+                                          ASSIGNMENT_PRECEDENCE),
+    "=" : const JSAssignmentOperatorPrecedence(),
+    "+=" : const JSAssignmentOperatorPrecedence(),
+    "-=" : const JSAssignmentOperatorPrecedence(),
+    "*=" : const JSAssignmentOperatorPrecedence(),
+    "/=" : const JSAssignmentOperatorPrecedence(),
+    "%=" : const JSAssignmentOperatorPrecedence(),
+    "&=" : const JSAssignmentOperatorPrecedence(),
+    "|=" : const JSAssignmentOperatorPrecedence(),
+    "^=" : const JSAssignmentOperatorPrecedence(),
+    "<<=" : const JSAssignmentOperatorPrecedence(),
+    ">>=" : const JSAssignmentOperatorPrecedence(),
+    ">>>=" : const JSAssignmentOperatorPrecedence(),
   };
 }
 
 class JSBinaryOperatorPrecedence {
   final int left;
   final int right;
   const JSBinaryOperatorPrecedence(this.left, this.right);
-  // All binary operators (excluding assignment) are left associative.
+  // All non-assignment binary operators are left associative.
   int get precedence() => left;
 }
+
+class JSAssignmentOperatorPrecedence implements JSBinaryOperatorPrecedence {
+  const JSAssignmentOperatorPrecedence();
+  // The actual left-hand-side of an assignment in JavaScript is the production
+  // 'LeftHandSideExpression ::= callExpression | newExpression'. We don't
+  // represent 'newExpression' at all.
+  int get left() => JSPrecedence.CALL_PRECEDENCE;
+  int get right() => JSPrecedence.ASSIGNMENT_PRECEDENCE;
+  int get precedence() => JSPrecedence.ASSIGNMENT_PRECEDENCE;
+}