namespace v8 {
namespace internal {
-// PositionStack is used for on-stack allocation of token positions for
-// new expressions. Please look at ParseNewExpression.
-
-class PositionStack {
- public:
- explicit PositionStack(bool* ok) : top_(NULL), ok_(ok) {}
- ~PositionStack() {
- ASSERT(!*ok_ || is_empty());
- USE(ok_);
- }
-
- class Element {
- public:
- Element(PositionStack* stack, int value) {
- previous_ = stack->top();
- value_ = value;
- stack->set_top(this);
- }
-
- private:
- Element* previous() { return previous_; }
- int value() { return value_; }
- friend class PositionStack;
- Element* previous_;
- int value_;
- };
-
- bool is_empty() { return top_ == NULL; }
- int pop() {
- ASSERT(!is_empty());
- int result = top_->value();
- top_ = top_->previous();
- return result;
- }
-
- private:
- Element* top() { return top_; }
- void set_top(Element* value) { top_ = value; }
- Element* top_;
- bool* ok_;
-};
-
-
RegExpBuilder::RegExpBuilder(Zone* zone)
: zone_(zone),
pending_empty_(false),
// LeftHandSideExpression ::
// (NewExpression | MemberExpression) ...
- Expression* result;
- if (peek() == Token::NEW) {
- result = ParseNewExpression(CHECK_OK);
- } else {
- result = ParseMemberExpression(CHECK_OK);
- }
+ Expression* result = ParseMemberWithNewPrefixesExpression(CHECK_OK);
while (true) {
switch (peek()) {
}
-Expression* Parser::ParseNewPrefix(PositionStack* stack, bool* ok) {
+Expression* Parser::ParseMemberWithNewPrefixesExpression(bool* ok) {
// NewExpression ::
// ('new')+ MemberExpression
- // The grammar for new expressions is pretty warped. The keyword
- // 'new' can either be a part of the new expression (where it isn't
- // followed by an argument list) or a part of the member expression,
- // where it must be followed by an argument list. To accommodate
- // this, we parse the 'new' keywords greedily and keep track of how
- // many we have parsed. This information is then passed on to the
- // member expression parser, which is only allowed to match argument
- // lists as long as it has 'new' prefixes left
- Expect(Token::NEW, CHECK_OK);
- PositionStack::Element pos(stack, position());
-
- Expression* result;
- if (peek() == Token::NEW) {
- result = ParseNewPrefix(stack, CHECK_OK);
- } else {
- result = ParseMemberWithNewPrefixesExpression(stack, CHECK_OK);
- }
-
- if (!stack->is_empty()) {
- int last = stack->pop();
- result = factory()->NewCallNew(
- result, new(zone()) ZoneList<Expression*>(0, zone()), last);
- }
- return result;
-}
+ // The grammar for new expressions is pretty warped. We can have several 'new'
+ // keywords following each other, and then a MemberExpression. When we see '('
+ // after the MemberExpression, it's associated with the rightmost unassociated
+ // 'new' to create a NewExpression with arguments. However, a NewExpression
+ // can also occur without arguments.
+ // Examples of new expression:
+ // new foo.bar().baz means (new (foo.bar)()).baz
+ // new foo()() means (new foo())()
+ // new new foo()() means (new (new foo())())
+ // new new foo means new (new foo)
+ // new new foo() means new (new foo())
-Expression* Parser::ParseNewExpression(bool* ok) {
- PositionStack stack(ok);
- return ParseNewPrefix(&stack, ok);
+ if (peek() == Token::NEW) {
+ Consume(Token::NEW);
+ int new_pos = position();
+ Expression* result = ParseMemberWithNewPrefixesExpression(CHECK_OK);
+ if (peek() == Token::LPAREN) {
+ // NewExpression with arguments.
+ ZoneList<Expression*>* args = ParseArguments(CHECK_OK);
+ return factory()->NewCallNew(result, args, new_pos);
+ }
+ // NewExpression without arguments.
+ return factory()->NewCallNew(
+ result, new(zone()) ZoneList<Expression*>(0, zone()), new_pos);
+ }
+ // No 'new' keyword.
+ return ParseMemberExpression(ok);
}
Expression* Parser::ParseMemberExpression(bool* ok) {
- return ParseMemberWithNewPrefixesExpression(NULL, ok);
-}
-
-
-Expression* Parser::ParseMemberWithNewPrefixesExpression(PositionStack* stack,
- bool* ok) {
// MemberExpression ::
// (PrimaryExpression | FunctionLiteral)
// ('[' Expression ']' | '.' Identifier | Arguments)*
if (fni_ != NULL) fni_->PushLiteralName(name);
break;
}
- case Token::LPAREN: {
- if ((stack == NULL) || stack->is_empty()) return result;
- // Consume one of the new prefixes (already parsed).
- ZoneList<Expression*>* args = ParseArguments(CHECK_OK);
- int pos = stack->pop();
- result = factory()->NewCallNew(result, args, pos);
- break;
- }
default:
return result;
}
// LeftHandSideExpression ::
// (NewExpression | MemberExpression) ...
- Expression result = Expression::Default();
- if (peek() == Token::NEW) {
- result = ParseNewExpression(CHECK_OK);
- } else {
- result = ParseMemberExpression(CHECK_OK);
- }
+ Expression result = ParseMemberWithNewPrefixesExpression(CHECK_OK);
while (true) {
switch (peek()) {
}
-PreParser::Expression PreParser::ParseNewExpression(bool* ok) {
+PreParser::Expression PreParser::ParseMemberWithNewPrefixesExpression(
+ bool* ok) {
// NewExpression ::
// ('new')+ MemberExpression
- // The grammar for new expressions is pretty warped. The keyword
- // 'new' can either be a part of the new expression (where it isn't
- // followed by an argument list) or a part of the member expression,
- // where it must be followed by an argument list. To accommodate
- // this, we parse the 'new' keywords greedily and keep track of how
- // many we have parsed. This information is then passed on to the
- // member expression parser, which is only allowed to match argument
- // lists as long as it has 'new' prefixes left
- unsigned new_count = 0;
- do {
- Consume(Token::NEW);
- new_count++;
- } while (peek() == Token::NEW);
+ // See Parser::ParseNewExpression.
- return ParseMemberWithNewPrefixesExpression(new_count, ok);
+ if (peek() == Token::NEW) {
+ Consume(Token::NEW);
+ ParseMemberWithNewPrefixesExpression(CHECK_OK);
+ if (peek() == Token::LPAREN) {
+ // NewExpression with arguments.
+ ParseArguments(CHECK_OK);
+ }
+ return Expression::Default();
+ }
+ // No 'new' keyword.
+ return ParseMemberExpression(ok);
}
PreParser::Expression PreParser::ParseMemberExpression(bool* ok) {
- return ParseMemberWithNewPrefixesExpression(0, ok);
-}
-
-
-PreParser::Expression PreParser::ParseMemberWithNewPrefixesExpression(
- unsigned new_count, bool* ok) {
// MemberExpression ::
// (PrimaryExpression | FunctionLiteral)
// ('[' Expression ']' | '.' Identifier | Arguments)*
}
break;
}
- case Token::LPAREN: {
- if (new_count == 0) return result;
- // Consume one of the new prefixes (already parsed).
- ParseArguments(CHECK_OK);
- new_count--;
- result = Expression::Default();
- break;
- }
default:
return result;
}
// or not.
RunParserSyncTest(context_data, statement_data, kSuccessOrError);
}
+
+
+TEST(NoErrorsNewExpression) {
+ const char* context_data[][2] = {
+ {"", ""},
+ {"var f =", ""},
+ { NULL, NULL }
+ };
+
+ const char* statement_data[] = {
+ "new foo",
+ "new foo();",
+ "new foo(1);",
+ "new foo(1, 2);",
+ // The first () will be processed as a part of the NewExpression and the
+ // second () will be processed as part of LeftHandSideExpression.
+ "new foo()();",
+ // The first () will be processed as a part of the inner NewExpression and
+ // the second () will be processed as a part of the outer NewExpression.
+ "new new foo()();",
+ "new foo.bar;",
+ "new foo.bar();",
+ "new foo.bar.baz;",
+ "new foo.bar().baz;",
+ "new foo[bar];",
+ "new foo[bar]();",
+ "new foo[bar][baz];",
+ "new foo[bar]()[baz];",
+ "new foo[bar].baz(baz)()[bar].baz;",
+ "new \"foo\"", // Runtime error
+ "new 1", // Runtime error
+ "new foo++",
+ // This even runs:
+ "(new new Function(\"this.x = 1\")).x;",
+ NULL
+ };
+
+ RunParserSyncTest(context_data, statement_data, kSuccess);
+}
+
+
+TEST(ErrorsNewExpression) {
+ const char* context_data[][2] = {
+ {"", ""},
+ {"var f =", ""},
+ { NULL, NULL }
+ };
+
+ const char* statement_data[] = {
+ "new foo bar",
+ "new ) foo",
+ "new ++foo",
+ NULL
+ };
+
+ RunParserSyncTest(context_data, statement_data, kError);
+}
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