Minor Additions to IDL4 Support

- Support following IDL v4 features:
  - Empty structs
  - `octet` and `wchar` union discriminators
  - Allow using empty parentheses in annotation applications to
    workaround syntax errors when an annotation with no arguments has to
    be followed by a complete scoped name:
      `@example_annotation() ::ex::ExampleType`
  - Reserve the `bitfield`, `bitmask`, and `bitset` keywords in IDL v4
    (these are not implemented yet)
- Allow using `map` as an identifier in IDL v3 again

TAO/NEWS

@@ -1,6 +1,18 @@
 USER VISIBLE CHANGES BETWEEN TAO-4.0.0 and TAO-4.0.1
 ====================================================
 
+- TAO_IDL:
+  - Support following IDL v4 features:
+    - Empty structs
+    - `octet` and `wchar` union discriminators
+    - Allow using empty parentheses in annotation applications to
+      workaround syntax errors when an annotation with no arguments has to
+      be followed by a complete scoped name:
+        `@example_annotation() ::ex::ExampleType`
+    - Reserve the `bitfield`, `bitmask`, and `bitset` keywords in IDL v4
+      (these are not implemented yet)
+  - Allow using `map` as an identifier in IDL v3 again
+
 USER VISIBLE CHANGES BETWEEN TAO-3.1.4 and TAO-4.0.0
 ====================================================
 

TAO/TAO_IDL/be/be_union.cpp

@@ -234,10 +234,12 @@ be_union::gen_empty_default_label ()
       return (n_labels < 2);
 
     case AST_PredefinedType::PT_char:
+    case AST_PredefinedType::PT_octet:
       return (n_labels <= ACE_OCTET_MAX);
 
     case AST_PredefinedType::PT_short:
     case AST_PredefinedType::PT_ushort:
+    case AST_PredefinedType::PT_wchar:
       return (n_labels <= ACE_UINT16_MAX);
 
     case AST_PredefinedType::PT_long:

TAO/TAO_IDL/be/be_union_branch.cpp

@@ -121,6 +121,7 @@ be_union_branch::gen_default_label_value (TAO_OutStream *os,
         *os << dv.u.short_val;
         break;
       case AST_Expression::EV_ushort:
+      case AST_Expression::EV_wchar:
         *os << dv.u.ushort_val;
         break;
       case AST_Expression::EV_long:

TAO/TAO_IDL/be/be_visitor_structure/cdr_op_cs.cpp

@@ -56,7 +56,9 @@ be_visitor_structure_cdr_op_cs::visit_structure (be_structure *node)
       << "TAO_OutputCDR &strm," << be_nl
       << "const " << node->name () << " &_tao_aggregate)" << be_uidt
       << be_uidt_nl
-      << "{" << be_idt_nl;
+      << "{" << be_idt_nl
+      << "ACE_UNUSED_ARG(strm);" << be_nl
+      << "ACE_UNUSED_ARG(_tao_aggregate);" << be_nl;
 
   be_visitor_context new_ctx (*this->ctx_);
   be_visitor_cdr_op_field_decl field_decl (&new_ctx);
@@ -81,7 +83,7 @@ be_visitor_structure_cdr_op_cs::visit_structure (be_structure *node)
                         -1);
     }
 
-  *os << ";" << be_uidt << be_uidt_nl
+  *os << "true;" << be_uidt << be_uidt_nl
       << "}" << be_nl_2;
 
   // Set the substate as generating code for the input operator.
@@ -104,7 +106,9 @@ be_visitor_structure_cdr_op_cs::visit_structure (be_structure *node)
     }
 
   *os << ")" << be_uidt << be_uidt_nl
-      << "{" << be_idt_nl;
+      << "{" << be_idt_nl
+      << "ACE_UNUSED_ARG(strm);" << be_nl
+      << "ACE_UNUSED_ARG(_tao_aggregate);" << be_nl;
 
   if (node->is_local ())
     {
@@ -135,7 +139,7 @@ be_visitor_structure_cdr_op_cs::visit_structure (be_structure *node)
                             -1);
         }
 
-      *os << ";" << be_uidt << be_uidt;
+      *os << "true;" << be_uidt << be_uidt;
     }
 
   *os << be_uidt_nl << "}" << be_nl;
@@ -157,8 +161,7 @@ be_visitor_structure_cdr_op_cs::post_process (be_decl *bd)
 {
   TAO_OutStream *os = this->ctx_->stream ();
 
-  if (!this->last_node (bd)
-      && bd->node_type () != AST_Decl::NT_enum_val)
+  if (bd->node_type () != AST_Decl::NT_enum_val)
     {
       switch (this->ctx_->sub_state ())
         {

TAO/TAO_IDL/be/be_visitor_union/cdr_op_cs.cpp

@@ -43,6 +43,9 @@ namespace {
         case AST_Expression::EV_int8:
           tmp_suffix = "int8";
           break;
+        case AST_Expression::EV_octet:
+          tmp_suffix = "octet";
+          break;
         default:
           break;
       }

TAO/TAO_IDL/be/be_visitor_union/discriminant_ci.cpp

@@ -160,6 +160,7 @@ be_visitor_union_discriminant_ci::visit_predefined_type (
           *os << dv.u.short_val;
           break;
         case AST_Expression::EV_ushort:
+        case AST_Expression::EV_wchar:
           *os << dv.u.ushort_val;
           break;
         case AST_Expression::EV_long:

TAO/TAO_IDL/fe/fe_lookup.cpp

@@ -7,7 +7,7 @@
 unsigned int
 TAO_IDL_CPP_Keyword_Table::hash (const char *str, unsigned int len)
 {
-  static const unsigned char asso_values[] =
+  static constexpr unsigned char asso_values[] =
     {
      252, 252, 252, 252, 252, 252, 252, 252, 252, 252,
      252, 252, 252, 252, 252, 252, 252, 252, 252, 252,

TAO/TAO_IDL/fe/idl.ll

@@ -112,6 +112,8 @@ static AST_Decl *           idl_find_node (const char *);
 #undef ECHO
 #endif
 
+#define IDL4_KEYWORD(TOKEN_NAME) if (idl_global->idl_version_ >= IDL_VERSION_4) return TOKEN_NAME;
+
 %}
 
 /* SO we don't choke on files that use \r\n */
@@ -138,7 +140,6 @@ enum            return IDL_ENUM;
 string          return IDL_STRING;
 wstring         return IDL_WSTRING;
 sequence        return IDL_SEQUENCE;
-map             return IDL_MAP;
 union           return IDL_UNION;
 fixed           return IDL_FIXED;
 switch          return IDL_SWITCH;
@@ -158,79 +159,6 @@ native          return IDL_NATIVE;
 local           return IDL_LOCAL;
 abstract        return IDL_ABSTRACT;
 
-int8 {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_INT8;
-  else
-    {
-      REJECT;
-    }
-}
-uint8 {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_UINT8;
-  else
-    {
-      REJECT;
-    }
-}
-int16 {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_INT16;
-  else
-    {
-      REJECT;
-    }
-}
-uint16 {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_UINT16;
-  else
-    {
-      REJECT;
-    }
-}
-int32 {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_INT32;
-  else
-    {
-      REJECT;
-    }
-}
-uint32 {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_UINT32;
-  else
-    {
-      REJECT;
-    }
-}
-int64 {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_INT64;
-  else
-    {
-      REJECT;
-    }
-}
-uint64 {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_UINT64;
-  else
-    {
-      REJECT;
-    }
-}
-map {
-  if (idl_global->idl_version_ >= IDL_VERSION_4)
-    return IDL_MAP;
-  else
-    {
-      REJECT;
-    }
-}
-
 custom          return IDL_CUSTOM;
 factory         return IDL_FACTORY;
 private         return IDL_PRIVATE;
@@ -282,6 +210,20 @@ oneway          return IDL_ONEWAY;
 @annotation[^A-Za-z0-9_] return IDL_ANNOTATION_DECL; // Allow annotation names that start with "annotation"
 @ return IDL_ANNOTATION_SYMBOL;
 
+int8 IDL4_KEYWORD(IDL_INT8); REJECT;
+uint8 IDL4_KEYWORD(IDL_UINT8); REJECT;
+int16 IDL4_KEYWORD(IDL_INT16); REJECT;
+uint16 IDL4_KEYWORD(IDL_UINT16); REJECT;
+int32 IDL4_KEYWORD(IDL_INT32); REJECT;
+uint32 IDL4_KEYWORD(IDL_UINT32); REJECT;
+int64 IDL4_KEYWORD(IDL_INT64); REJECT;
+uint64 IDL4_KEYWORD(IDL_UINT64); REJECT;
+
+bitfield IDL4_KEYWORD(IDL_BITFIELD); REJECT;
+bitmask IDL4_KEYWORD(IDL_BITMASK); REJECT;
+bitset IDL4_KEYWORD(IDL_BITSET); REJECT;
+map IDL4_KEYWORD(IDL_MAP); REJECT;
+
 [a-ij-rs-zA-IJ-RS-Z_][a-ij-rs-zA-IJ-RS-Z0-9_]* {
   // Make sure that this identifier is not a C++ keyword. If it is,
   // prepend it with a _cxx_. Lookup in the perfect hash table for C++