dcparser: Fix segfault with nested struct or switch

Fixes #1499

direct/src/dcparser/dcParser.h.prebuilt

@@ -1,8 +1,9 @@
-/* A Bison parser, made by GNU Bison 3.1.  */
+/* A Bison parser, made by GNU Bison 3.8.2.  */
 
 /* Bison interface for Yacc-like parsers in C
 
-   Copyright (C) 1984, 1989-1990, 2000-2015, 2018 Free Software Foundation, Inc.
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2021 Free Software Foundation,
+   Inc.
 
    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -15,7 +16,7 @@
    GNU General Public License for more details.
 
    You should have received a copy of the GNU General Public License
-   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
 
 /* As a special exception, you may create a larger work that contains
    part or all of the Bison parser skeleton and distribute that work
@@ -30,6 +31,10 @@
    This special exception was added by the Free Software Foundation in
    version 2.2 of Bison.  */
 
+/* DO NOT RELY ON FEATURES THAT ARE NOT DOCUMENTED in the manual,
+   especially those whose name start with YY_ or yy_.  They are
+   private implementation details that can be changed or removed.  */
+
 #ifndef YY_DCYY_BUILT_TMP_DCPARSER_YXX_H_INCLUDED
 # define YY_DCYY_BUILT_TMP_DCPARSER_YXX_H_INCLUDED
 /* Debug traces.  */
@@ -40,54 +45,63 @@
 extern int dcyydebug;
 #endif
 
-/* Token type.  */
+/* Token kinds.  */
 #ifndef YYTOKENTYPE
 # define YYTOKENTYPE
   enum yytokentype
   {
-    UNSIGNED_INTEGER = 258,
-    SIGNED_INTEGER = 259,
-    REAL = 260,
-    STRING = 261,
-    IDENTIFIER = 262,
-    HEX_STRING = 263,
-    KEYWORD = 264,
-    KW_DCLASS = 265,
-    KW_STRUCT = 266,
-    KW_FROM = 267,
-    KW_IMPORT = 268,
-    KW_TYPEDEF = 269,
-    KW_KEYWORD = 270,
-    KW_SWITCH = 271,
-    KW_CASE = 272,
-    KW_DEFAULT = 273,
-    KW_BREAK = 274,
-    KW_INT8 = 275,
-    KW_INT16 = 276,
-    KW_INT32 = 277,
-    KW_INT64 = 278,
-    KW_UINT8 = 279,
-    KW_UINT16 = 280,
-    KW_UINT32 = 281,
-    KW_UINT64 = 282,
-    KW_FLOAT64 = 283,
-    KW_STRING = 284,
-    KW_BLOB = 285,
-    KW_BLOB32 = 286,
-    KW_INT8ARRAY = 287,
-    KW_INT16ARRAY = 288,
-    KW_INT32ARRAY = 289,
-    KW_UINT8ARRAY = 290,
-    KW_UINT16ARRAY = 291,
-    KW_UINT32ARRAY = 292,
-    KW_UINT32UINT8ARRAY = 293,
-    KW_CHAR = 294,
-    START_DC = 295,
-    START_PARAMETER_VALUE = 296,
-    START_PARAMETER_DESCRIPTION = 297
+    YYEMPTY = -2,
+    YYEOF = 0,                     /* "end of file"  */
+    YYerror = 256,                 /* error  */
+    YYUNDEF = 257,                 /* "invalid token"  */
+    UNSIGNED_INTEGER = 258,        /* UNSIGNED_INTEGER  */
+    SIGNED_INTEGER = 259,          /* SIGNED_INTEGER  */
+    REAL = 260,                    /* REAL  */
+    STRING = 261,                  /* STRING  */
+    IDENTIFIER = 262,              /* IDENTIFIER  */
+    HEX_STRING = 263,              /* HEX_STRING  */
+    KEYWORD = 264,                 /* KEYWORD  */
+    KW_DCLASS = 265,               /* KW_DCLASS  */
+    KW_STRUCT = 266,               /* KW_STRUCT  */
+    KW_FROM = 267,                 /* KW_FROM  */
+    KW_IMPORT = 268,               /* KW_IMPORT  */
+    KW_TYPEDEF = 269,              /* KW_TYPEDEF  */
+    KW_KEYWORD = 270,              /* KW_KEYWORD  */
+    KW_SWITCH = 271,               /* KW_SWITCH  */
+    KW_CASE = 272,                 /* KW_CASE  */
+    KW_DEFAULT = 273,              /* KW_DEFAULT  */
+    KW_BREAK = 274,                /* KW_BREAK  */
+    KW_INT8 = 275,                 /* KW_INT8  */
+    KW_INT16 = 276,                /* KW_INT16  */
+    KW_INT32 = 277,                /* KW_INT32  */
+    KW_INT64 = 278,                /* KW_INT64  */
+    KW_UINT8 = 279,                /* KW_UINT8  */
+    KW_UINT16 = 280,               /* KW_UINT16  */
+    KW_UINT32 = 281,               /* KW_UINT32  */
+    KW_UINT64 = 282,               /* KW_UINT64  */
+    KW_FLOAT64 = 283,              /* KW_FLOAT64  */
+    KW_STRING = 284,               /* KW_STRING  */
+    KW_BLOB = 285,                 /* KW_BLOB  */
+    KW_BLOB32 = 286,               /* KW_BLOB32  */
+    KW_INT8ARRAY = 287,            /* KW_INT8ARRAY  */
+    KW_INT16ARRAY = 288,           /* KW_INT16ARRAY  */
+    KW_INT32ARRAY = 289,           /* KW_INT32ARRAY  */
+    KW_UINT8ARRAY = 290,           /* KW_UINT8ARRAY  */
+    KW_UINT16ARRAY = 291,          /* KW_UINT16ARRAY  */
+    KW_UINT32ARRAY = 292,          /* KW_UINT32ARRAY  */
+    KW_UINT32UINT8ARRAY = 293,     /* KW_UINT32UINT8ARRAY  */
+    KW_CHAR = 294,                 /* KW_CHAR  */
+    START_DC = 295,                /* START_DC  */
+    START_PARAMETER_VALUE = 296,   /* START_PARAMETER_VALUE  */
+    START_PARAMETER_DESCRIPTION = 297 /* START_PARAMETER_DESCRIPTION  */
   };
+  typedef enum yytokentype yytoken_kind_t;
 #endif
-/* Tokens.  */
+/* Token kinds.  */
+#define YYEMPTY -2
+#define YYEOF 0
+#define YYerror 256
+#define YYUNDEF 257
 #define UNSIGNED_INTEGER 258
 #define SIGNED_INTEGER 259
 #define REAL 260
@@ -134,6 +148,8 @@ extern int dcyydebug;
 
 extern YYSTYPE dcyylval;
 
+
 int dcyyparse (void);
 
+
 #endif /* !YY_DCYY_BUILT_TMP_DCPARSER_YXX_H_INCLUDED  */

direct/src/dcparser/dcParser.yxx

@@ -297,6 +297,7 @@ dclass_or_struct:
 dclass:
         KW_DCLASS optional_name
 {
+  $<u.dclass>$ = current_class;
   current_class = new DCClass(dc_file, $2, false, false);
 }
         dclass_derivation '{' dclass_fields '}'
@@ -401,6 +402,7 @@ dclass_field:
 struct:
         KW_STRUCT optional_name
 {
+  $<u.dclass>$ = current_class;
   current_class = new DCClass(dc_file, $2, true, false);
 }
         struct_derivation '{' struct_fields '}'
@@ -488,6 +490,7 @@ struct_field:
 atomic_field:
         optional_name '('
 {
+  $<u.atomic>$ = current_atomic;
   if (current_class == nullptr) {
     yyerror("Cannot define a method outside of a struct or class.");
     DCClass *temp_class = new DCClass(dc_file, "temp", false, false);  // memory leak.
@@ -1243,12 +1246,13 @@ optional_name:
 switch:
         KW_SWITCH optional_name '(' parameter_or_atomic ')' '{'
 {
+  $<u.dswitch>$ = current_switch;
   current_switch = new DCSwitch($2, $4);
 }
         switch_fields '}'
 {
   $$ = current_switch;
-  current_switch = (DCSwitch *)$<u.parameter>7;
+  current_switch = $<u.dswitch>7;
 }
         ;