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Disallow explicit cast to nt_array_ptr in checked scopes (#391) #626

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merged 2 commits into from
Jul 18, 2019
Merged

Disallow explicit cast to nt_array_ptr in checked scopes (#391) #626

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a53808e
Disallow explicit cast to nt_array_ptr in checked scopes (#391)
jiezhoucs Jul 9, 2019
8b2bc5b
Cleaned up the code that disallows casting to nt_array_ptr.
jiezhoucs Jul 10, 2019
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4 changes: 4 additions & 0 deletions include/clang/Basic/DiagnosticSemaKinds.td
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Original file line number Diff line number Diff line change
Expand Up @@ -9867,6 +9867,10 @@ def err_bounds_type_annotation_lost_checking : Error<
def err_checked_scope_no_assume_bounds_casting : Error<
"_Assume_bounds_cast not allowed in a checked scope or function">;

def err_checked_scope_no_cast_to_nt_array_ptr : Error<
"%0 cannot be cast to %1 in a checked scope because "
"%0 might not point to a null-terminated array">;

def err_checked_on_non_function : Error<
"%select{'_Unchecked'|'_Checked _Bounds_only|'_Checked'}0 "
"can only appear on functions">;
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13 changes: 13 additions & 0 deletions lib/Sema/SemaCast.cpp
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Expand Up @@ -2700,6 +2700,19 @@ void CastOperation::CheckCStyleCast(bool IsCheckedScope) {
SrcExpr = ExprError();
return;
}

// Disallow cast from other Checked Pointer types to nt_arary_ptr because
// the SrcType might not point to a NULL-terminated array.
if (DestType->isPointerType() && DestType->isCheckedPointerNtArrayType()) {
if (SrcType->isPointerType() && !SrcType->isCheckedPointerNtArrayType()) {
Self.Diag(SrcExpr.get()->getExprLoc(),
diag::err_checked_scope_no_cast_to_nt_array_ptr)
<< SrcType << DestType << SrcExpr.get()->getSourceRange();
SrcExpr = ExprError();
return;
}
}

}

DiagnoseCastOfObjCSEL(Self, SrcExpr, DestType);
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