c - ANTLR4 不解析 typedef

Question

我正在使用 ANTLR4 和 C 的规范语法，如下所示:
https://github.com/antlr/grammars-v4/tree/master/c

我不会以任何方式修改语法。我发现对发生在函数外部的 typedef 语句的解析失败。我能给出的最简单的例子:

通行证:

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

失败:

typedef unsigned int UINT;

main()
{
    return 0;
}

错误信息是:

line 1:0 no viable alternative at input 'typedef'

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

Answer 1

对我有用:


antlr4 C.g4
javac *.java
grun C compilationUnit -tree t.c
(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>)


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