tree 277d3f84afce93de0d22232b19444b782aeafb26
parent 3ba1e74664afd54ad1ad1460d5b8c205c262535a
author ross.kirsling@sony.com <ross.kirsling@sony.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1558037302 +0000
committer ross.kirsling@sony.com <ross.kirsling@sony.com@268f45cc-cd09-0410-ab3c-d52691b4dbfc> 1558037302 +0000

[JSC] Invalid AssignmentTargetType should be an early error.
https://bugs.webkit.org/show_bug.cgi?id=197603

Reviewed by Keith Miller.

JSTests:

* test262/expectations.yaml:
Update expectations to reflect new SyntaxErrors.
(Ideally, these should all be viewed as passing in the near future.)

* stress/async-await-basic.js:
* stress/big-int-literals.js:
Update tests to reflect new SyntaxErrors.

* ChakraCore.yaml:
* ChakraCore/test/EH/try6.baseline-jsc:
* ChakraCore/test/Error/variousErrors3.baseline-jsc: Added.
Update baselines to reflect new SyntaxErrors.

Source/JavaScriptCore:

Since ES6, expressions like 0++, ++0, 0 = 0, and 0 += 0 are all specified as early errors:
  https://tc39.github.io/ecma262/#sec-update-expressions-static-semantics-early-errors
  https://tc39.github.io/ecma262/#sec-assignment-operators-static-semantics-early-errors

We currently throw late ReferenceErrors for these -- let's turn them into early SyntaxErrors.
(This is based on the expectation that https://github.com/tc39/ecma262/pull/1527 will be accepted;
if that doesn't come to pass, we can subsequently introduce early ReferenceError and revise these.)

* bytecompiler/NodesCodegen.cpp:
(JSC::PostfixNode::emitBytecode): Add an assert for "function call LHS" case.
(JSC::PrefixNode::emitBytecode): Add an assert for "function call LHS" case.

* parser/ASTBuilder.h:
(JSC::ASTBuilder::isLocation): Added.
(JSC::ASTBuilder::isAssignmentLocation): Fix misleading parameter name.
(JSC::ASTBuilder::isFunctionCall): Added.
(JSC::ASTBuilder::makeAssignNode): Add an assert for "function call LHS" case.
* parser/SyntaxChecker.h:
(JSC::SyntaxChecker::isLocation): Added.
(JSC::SyntaxChecker::isAssignmentLocation): Fix incorrect definition and align with ASTBuilder.
(JSC::SyntaxChecker::isFunctionCall): Added.
* parser/Nodes.h:
(JSC::ExpressionNode::isFunctionCall const): Added.
Ensure that the parser can check whether an expression node is a function call.

* parser/Parser.cpp:
(JSC::Parser<LexerType>::isSimpleAssignmentTarget): Added.
(JSC::Parser<LexerType>::parseAssignmentExpression):
(JSC::Parser<LexerType>::parseUnaryExpression): See below.
* parser/Parser.h:
Throw SyntaxError whenever an assignment or update expression's target is invalid.
Unfortunately, it seems that web compatibility obliges us to exempt the "function call LHS" case in sloppy mode.
(https://github.com/tc39/ecma262/issues/257#issuecomment-195106880)

Additional cleanup items:
  - Make use of `semanticFailIfTrue` for `isMetaProperty` checks, as it's equivalent.
  - Rename `requiresLExpr` to `hasPrefixUpdateOp` since it's now confusing,
    and get rid of `modifiesExpr` since it refers to the exact same condition.
  - Stop setting `lastOperator` near the end -- one case was incorrect and regardless neither is used.

LayoutTests:

* fast/events/window-onerror4-expected.txt:
* ietestcenter/Javascript/11.13.1-1-1-expected.txt:
* ietestcenter/Javascript/11.13.1-1-2-expected.txt:
* ietestcenter/Javascript/11.13.1-1-3-expected.txt:
* ietestcenter/Javascript/11.13.1-1-4-expected.txt:
* js/basic-strict-mode-expected.txt:
* js/dom/assign-expected.txt:
* js/dom/line-column-numbers-expected.txt:
* js/dom/line-column-numbers.html:
* js/dom/postfix-syntax-expected.txt:
* js/dom/prefix-syntax-expected.txt:
* js/dom/script-tests/line-column-numbers.js:
* js/function-toString-parentheses-expected.txt:
* js/parser-syntax-check-expected.txt:
* js/parser-xml-close-comment-expected.txt:
* js/script-tests/function-toString-parentheses.js:
* js/script-tests/parser-syntax-check.js:
Update tests & expectations to reflect new SyntaxErrors.

* js/script-tests/toString-prefix-postfix-preserve-parens.js:
* js/toString-prefix-postfix-preserve-parens-expected.txt:
None of the prefix/postfix tests make sense here now that they're all SyntaxErrors;
remove them and just leave the typeof tests.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@245406 268f45cc-cd09-0410-ab3c-d52691b4dbfc