Disallow try/catch/throw when exceptions are disabled.

llvm-svn: 126039

clang/include/clang/Basic/DiagnosticSemaKinds.td

@@ -2823,6 +2823,8 @@ def err_bad_memptr_lhs : Error<
 def warn_exception_caught_by_earlier_handler : Warning<
   "exception of type %0 will be caught by earlier handler">;
 def note_previous_exception_handler : Note<"for type %0">;
+def err_exceptions_disabled : Error<
+  "cannot use '%0' with exceptions disabled">;
 def warn_non_virtual_dtor : Warning<
   "%0 has virtual functions but non-virtual destructor">,
   InGroup<NonVirtualDtor>, DefaultIgnore;

clang/lib/Sema/SemaExprCXX.cpp

@@ -476,6 +476,9 @@ Sema::ActOnCXXNullPtrLiteral(SourceLocation Loc) {
 /// ActOnCXXThrow - Parse throw expressions.
 ExprResult
 Sema::ActOnCXXThrow(SourceLocation OpLoc, Expr *Ex) {
+  if (!getLangOptions().Exceptions)
+    return Diag(OpLoc, diag::err_exceptions_disabled) << "throw";
+
   if (Ex && !Ex->isTypeDependent() && CheckCXXThrowOperand(OpLoc, Ex))
     return ExprError();
   return Owned(new (Context) CXXThrowExpr(Ex, Context.VoidTy, OpLoc));

clang/lib/Sema/SemaStmt.cpp

@@ -1741,6 +1741,9 @@ public:
 StmtResult
 Sema::ActOnCXXTryBlock(SourceLocation TryLoc, Stmt *TryBlock,
                        MultiStmtArg RawHandlers) {
+  if (!getLangOptions().Exceptions)
+    return Diag(TryLoc, diag::err_exceptions_disabled) << "try";
+
   unsigned NumHandlers = RawHandlers.size();
   assert(NumHandlers > 0 &&
          "The parser shouldn't call this if there are no handlers.");

clang/test/SemaCXX/no-exceptions.cpp

@@ -19,3 +19,17 @@ namespace test0 {
     (void) new Foo();
   }
 }
+
+namespace test1 {
+void f() {
+  throw; // expected-error {{cannot use 'throw' with exceptions disabled}}
+}
+
+void g() {
+  try { // expected-error {{cannot use 'try' with exceptions disabled}}
+    f();
+  } catch (...) {
+  }
+}
+
+}