diff options
Diffstat (limited to 'js/src/frontend/Parser.cpp')
| -rw-r--r-- | js/src/frontend/Parser.cpp | 26 |
1 files changed, 21 insertions, 5 deletions
diff --git a/js/src/frontend/Parser.cpp b/js/src/frontend/Parser.cpp index 7e43bc3b5..2e13910df 100644 --- a/js/src/frontend/Parser.cpp +++ b/js/src/frontend/Parser.cpp @@ -1211,6 +1211,25 @@ Parser<ParseHandler>::tryDeclareVarForAnnexBLexicalFunction(HandlePropertyName n if (!tryDeclareVar(name, DeclarationKind::VarForAnnexBLexicalFunction, &redeclaredKind)) return false; + if (!redeclaredKind && pc->isFunctionBox()) { + ParseContext::Scope& funScope = pc->functionScope(); + ParseContext::Scope& varScope = pc->varScope(); + if (&funScope != &varScope) { + // Annex B.3.3.1 disallows redeclaring parameter names. In the + // presence of parameter expressions, parameter names are on the + // function scope, which encloses the var scope. This means + // tryDeclareVar call above would not catch this case, so test it + // manually. + if (AddDeclaredNamePtr p = funScope.lookupDeclaredNameForAdd(name)) { + DeclarationKind declaredKind = p->value()->kind(); + if (DeclarationKindIsParameter(declaredKind)) + redeclaredKind = Some(declaredKind); + else + MOZ_ASSERT(FunctionScope::isSpecialName(context, name)); + } + } + } + if (redeclaredKind) { // If an early error would have occurred, undo all the // VarForAnnexBLexicalFunction declarations. @@ -1751,11 +1770,8 @@ Parser<FullParseHandler>::newFunctionScopeData(ParseContext::Scope& scope, bool case BindingKind::Var: // The only vars in the function scope when there are parameter // exprs, which induces a separate var environment, should be the - // special internal bindings. - MOZ_ASSERT_IF(hasParameterExprs, - bi.name() == context->names().arguments || - bi.name() == context->names().dotThis || - bi.name() == context->names().dotGenerator); + // special bindings. + MOZ_ASSERT_IF(hasParameterExprs, FunctionScope::isSpecialName(context, bi.name())); if (!vars.append(binding)) return Nothing(); break; |