ANTLR4无法解析typedef

Question

我在这里使用ANTLR4和C的规范语法：
https://github.com/antlr/grammars-v4/tree/master/c

我不会以任何方式修改语法。 我发现在函数外部发生的typedef语句上解析失败。 我可以给出的最简单的示例：

关：

main()
{
    typedef unsigned int UINT;
    return 0;
}

失败：

typedef unsigned int UINT;

main()
{
    return 0;
}

错误消息是：

1：0行在输入'typedef'上没有可行的选择

我不知道C中有任何规则说typedef必须出现在函数内。 这是ANTLR C语法中的错误，还是我做错了什么？

Answer 1

为我工作：

antlr4 C.g4 javac *.java grun C compilationUnit -tree tc (compilationUnit (translationUnit (translationUnit (externalDeclaration (declaration (declarationSpecifiers (declarationSpecifier (storageClassSpecifier typedef)) (declarationSpecifier (typeSpecifier unsigned)) (declarationSpecifier (typeSpecifier int)) (declarationSpecifier (typeSpecifier (typedefName UINT)))) ;))) (externalDeclaration (functionDefinition (declarator (directDeclarator (directDeclarator main) ( ))) (compoundStatement { (blockItemList (blockItem (statement (jumpStatement return (expression (assignmentExpression (conditionalExpression (logicalOrExpression (logicalAndExpression (inclusiveOrExpression (exclusiveOrExpression (andExpression (equalityExpression (relationalExpression (shiftExpression (additiveExpression (multiplicativeExpression (castExpression (unaryExpression (postfixExpression (primaryExpression 0))))))))))))))))) ;)))) })))) <EOF>)

ANTLR版本问题？ javac和antlr4之间的类路径差异？