ForIn loop_statement(this, stmt);
increment_loop_depth();
- // Get the object to enumerate over. Both SpiderMonkey and JSC
- // ignore null and undefined in contrast to the specification; see
- // ECMA-262 section 12.6.4.
+ // Get the object to enumerate over. If the object is null or undefined, skip
+ // over the loop. See ECMA-262 version 5, section 12.6.4.
VisitForAccumulatorValue(stmt->enumerable());
__ mov(a0, result_register()); // Result as param to InvokeBuiltin below.
__ LoadRoot(at, Heap::kUndefinedValueRootIndex);
}
+void FullCodeGenerator::VisitForOfStatement(ForOfStatement* stmt) {
+ Comment cmnt(masm_, "[ ForOfStatement");
+ SetStatementPosition(stmt);
+
+ Iteration loop_statement(this, stmt);
+ increment_loop_depth();
+
+ // var iterator = iterable[@@iterator]()
+ VisitForAccumulatorValue(stmt->assign_iterator());
+ __ mov(a0, v0);
+
+ // As with for-in, skip the loop if the iterator is null or undefined.
+ __ LoadRoot(at, Heap::kUndefinedValueRootIndex);
+ __ Branch(loop_statement.break_label(), eq, a0, Operand(at));
+ __ LoadRoot(at, Heap::kNullValueRootIndex);
+ __ Branch(loop_statement.break_label(), eq, a0, Operand(at));
+
+ // Convert the iterator to a JS object.
+ Label convert, done_convert;
+ __ JumpIfSmi(a0, &convert);
+ __ GetObjectType(a0, a1, a1);
+ __ Branch(&done_convert, ge, a1, Operand(FIRST_SPEC_OBJECT_TYPE));
+ __ bind(&convert);
+ __ push(a0);
+ __ InvokeBuiltin(Builtins::TO_OBJECT, CALL_FUNCTION);
+ __ mov(a0, v0);
+ __ bind(&done_convert);
+ __ push(a0);
+
+ // Loop entry.
+ __ bind(loop_statement.continue_label());
+
+ // result = iterator.next()
+ VisitForEffect(stmt->next_result());
+
+ // if (result.done) break;
+ Label result_not_done;
+ VisitForControl(stmt->result_done(),
+ loop_statement.break_label(),
+ &result_not_done,
+ &result_not_done);
+ __ bind(&result_not_done);
+
+ // each = result.value
+ VisitForEffect(stmt->assign_each());
+
+ // Generate code for the body of the loop.
+ Visit(stmt->body());
+
+ // Check stack before looping.
+ PrepareForBailoutForId(stmt->BackEdgeId(), NO_REGISTERS);
+ EmitBackEdgeBookkeeping(stmt, loop_statement.continue_label());
+ __ jmp(loop_statement.continue_label());
+
+ // Exit and decrement the loop depth.
+ PrepareForBailoutForId(stmt->ExitId(), NO_REGISTERS);
+ __ bind(loop_statement.break_label());
+ decrement_loop_depth();
+}
+
+
void FullCodeGenerator::EmitNewClosure(Handle<SharedFunctionInfo> info,
bool pretenure) {
// Use the fast case closure allocation code that allocates in new