当我生成我的Tree Parser时，我得到的错误表明方法getText()未定义类型对象。因为它的大约500000个字符所以无法进入全班。
但这些是我得到的类似错误行
public int specialStateTransition(int s, IntStream _input) throws NoViableAltException {
TreeNodeStream input = (TreeNodeStream)_input;
int _s = s;
switch ( s ) {
case 0 :
int LA3_11 = input.LA(1);
int index3_11 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_11);
if ( s>=0 ) return s;
break;
case 1 :
int LA3_16 = input.LA(1);
int index3_16 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_16);
if ( s>=0 ) return s;
break;
case 2 :
int LA3_20 = input.LA(1);
int index3_20 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_20);
if ( s>=0 ) return s;
break;
case 3 :
int LA3_22 = input.LA(1);
int index3_22 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_22);
if ( s>=0 ) return s;
break;
case 4 :
int LA3_23 = input.LA(1);
int index3_23 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_23);
if ( s>=0 ) return s;
break;
case 5 :
int LA3_24 = input.LA(1);
int index3_24 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_24);
if ( s>=0 ) return s;
break;
case 6 :
int LA3_25 = input.LA(1);
int index3_25 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_25);
if ( s>=0 ) return s;
break;
case 7 :
int LA3_26 = input.LA(1);
int index3_26 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_26);
if ( s>=0 ) return s;
break;
case 8 :
int LA3_27 = input.LA(1);
int index3_27 = input.index();
input.rewind();
s = -1;
if ( ((synpred5_Walker()&&(isTypeName(input.LT(1).getText())))) ) {s = 1;}
else if ( (true) ) {s = 8;}
input.seek(index3_27);
if ( s>=0 ) return s;
break;
}
if (state.backtracking>0) {state.failed=true; return -1;}
NoViableAltException nvae =
new NoViableAltException(getDescription(), 3, _s, input);
error(nvae);
throw nvae;
}
}
我的树语法
tree grammar Walker;
options {
tokenVocab = c2p;
ASTLabelType = CommonTree;
backtrack=true;
output=AST;
}
@header {
package com.frankdaniel.compiler ;
}
translation_unit
: external_declaration+
;
external_declaration
options {k=1;}
: (declaration_specifiers? declarator declaration* L_C_BRACKET! )=> function_definition //-> EXTERNAL_DECLARATOR function_definition
| declaration
;
function_definition
: declaration_specifiers? declarator (declaration+ compound_statement|compound_statement) //-> ^(FUNCTIONDEF declaration_specifiers? declarator (declaration+ compound_statement|compound_statement))
;
declaration
: 'typedef' declaration_specifiers? init_declarator_list SEMICOLON! // special case, looking for typedef
| declaration_specifiers init_declarator_list? SEMICOLON!
;
declaration_specifiers
: ( storage_class_specifier
| type_specifier
| type_qualifier
)+
;
init_declarator_list
: ^(INIT_DECLARATOR_LIST init_declarator+)
;
init_declarator
: declarator (ASSIGN^ initializer)?
;
storage_class_specifier
: EXTERN
| STATIC
| AUTO
| REGISTER
;
type_specifier
: VOID
| CHAR
| INT
| FLOAT
| type_id
;
type_id
: IDENTIFIER
// {System.out.println($IDENTIFIER.text+" is a type");}
;
type_qualifier
: CONST
;
declarator
: pointer? direct_declarator
| pointer
;
direct_declarator
: (IDENTIFIER|LPAREN! declarator RPAREN!)
declarator_suffix*
;
declarator_suffix
: constant_expression
| RBRACKET! LBRACKET!
| parameter_type_list
| identifier_list
| LPAREN! RPAREN!
;
pointer
: TIMES type_qualifier+ pointer?
| TIMES pointer
| TIMES
;
parameter_type_list
: parameter_list
;
parameter_list
: ^(PARAMETER_LIST parameter_declaration)
;
parameter_declaration
: declaration_specifiers (declarator|abstract_declarator)*
;
identifier_list
: ^(IDENTIFIER_LIST IDENTIFIER+)
;
type_name
: specifier_qualifier_list abstract_declarator?
;
specifier_qualifier_list
: ( type_qualifier | type_specifier )+
;
abstract_declarator
: pointer direct_abstract_declarator?
| direct_abstract_declarator
;
direct_abstract_declarator
: ( LPAREN! abstract_declarator RPAREN | abstract_declarator_suffix ) abstract_declarator_suffix*
;
abstract_declarator_suffix
: RBRACKET! LBRACKET!
| constant_expression
| LPAREN! RPAREN!
| parameter_type_list
;
initializer
: assignment_expression
| initializer_list
;
initializer_list
: ^(INITIALIZER_LIST initializer+)
;
// EXPRESSIONS
argument_expression_list
: ^(EXPRESSION_LIST assignment_expression+)
;
multiplicative_expression
: (cast_expression) (TIMES^ cast_expression | DIV^ cast_expression | MOD^ cast_expression)*
;
additive_expression
: (multiplicative_expression) (PLUS^ multiplicative_expression | MINUS^ multiplicative_expression)*
;
cast_expression
: ^(CAST_EXPRESSION type_name cast_expression)
| unary_expression
;
unary_expression
: postfix_expression
| PPLUS unary_expression
| MMINUS unary_expression
| unary_operator cast_expression
;
postfix_expression
: primary_expression
( RBRACKET! expression LBRACKET!
| LPAREN! RPAREN!
| LPAREN! argument_expression_list RPAREN!
| DOT! IDENTIFIER
// | PPLUS
// | MMINUS
)*
;
unary_operator
: BITWISEAND
| TIMES
| PLUS
| MINUS
| NOT
;
primary_expression
: IDENTIFIER
| constant
| expression
;
constant
: HEX_LITERAL
| OCTAL_LITERAL
| DECIMAL_LITERAL
| CHARACTER_LITERAL
| STRING_LITERAL
| FLOATING_POINT_LITERAL
;
expression
: ^(EXPRESSION assignment_expression+)
;
constant_expression
: conditional_expression
;
assignment_expression
:^(assignment_operator lvalue assignment_expression)
| conditional_expression
;
lvalue
: unary_expression
;
assignment_operator
: ASSIGN
;
conditional_expression
: logical_or_expression (QUESTIONMARK! expression COLON! conditional_expression)?
;
logical_or_expression
: logical_and_expression (OR^ logical_and_expression)*
;
logical_and_expression
: inclusive_or_expression (AND^ inclusive_or_expression)*
;
inclusive_or_expression
: exclusive_or_expression ('|'^ exclusive_or_expression)*
;
exclusive_or_expression
: and_expression ('^'^ and_expression)*
;
and_expression
: equality_expression ('&'^ equality_expression)*
;
equality_expression
: relational_expression ((EQUAL|NONEQUAL)^ relational_expression)* ;
relational_expression
: shift_expression ((ST|GT|STEQ|GTEQ)^ shift_expression)*
;
shift_expression
: additive_expression ((LSHIFT|RSHIFT)^ additive_expression)*
;
// STATEMENTS
statement
: labeled_statement
| compound_statement
| expression_statement
| selection_statement
| iteration_statement
| jump_statement
;
labeled_statement
: IDENTIFIER statement
| CASE constant_expression statement
| DEFAULT statement
;
compound_statement
: ^(STATEMENT declaration* statement_list? )
;
statement_list
: statement+
;
expression_statement
: expression
;
selection_statement
:IF^ LPAREN! expression RPAREN! i=statement (ELSE^ e=statement)?
| ^(SWITCH expression statement)
;
iteration_statement
: ^(WHILE expression statement)
| ^(DO statement ^(WHILE expression))
| ^(FOR expression_statement expression_statement expression? statement)
;
jump_statement
: ^(GOTO IDENTIFIER)
| CONTINUE
| BREAK
| ^(RETURN expression?)
;
测试文件
int main(void) {
int n;
int i;
int flag;
printf("Enter value of N > ");
scanf("%d", &n);
flag = 1;
for (i=2; (i<(n/2)) && flag; ) { /* May be we do not need to test
values of i greater than the square root of n? */
if ((n % i) == 0) /* If true n is divisible by i */
flag = 0;
else
i=i+1;
}
if (flag)
printf("%d is prime\n", n);
else
printf("%d has %d as a factor\n", n, i);
return 0;
}
错误
编译器\ Walker.g：节点从第3行：第4行不匹配的树节点：PARAMETER_LIST期待SEMICOLON 编译器\ Walker.g：节点从第3行：9行不匹配的树节点：UP期望SEMICOLON编译器\ Walker.g：节点来自第5行：2不匹配的树节点：int期望SEMICOLON编译器\ Walker.g：来自第6行的节点： 2不匹配的树节点：int期望SEMICOLON编译器\ Walker.g：节点从第6行：6不匹配的树节点：UP期望SEMICOLON编译器\ Walker.g：节点从第8行：2不匹配的树节点：EXPRESSION_LIST期待SEMICOLON 编译器\ Walker.g：节点从第9行：2不匹配的树节点：EXPRESSION_LIST期待SEMICOLON 编译器\ Walker.g：节点从第9:15行不匹配的树节点：UP期望SEMICOLON编译器\ Walker.g：节点从第10行：9不匹配的树节点：1期待SEMICOLON编译器\ Walker.g：节点从第11行： 9个不匹配的树节点：2期待SEMICOLON编译器\ Walker.g：节点从第1113行后不匹配的树节点：EXPRESSION期待SEMICOLON 编译器\ Walker.g：节点从第11:18行不匹配树节点：2期待SEMICOLON编译器\ Walker.g：节点从第1125行后不匹配的树节点：UP期望SEMICOLON编译器\ Walker.g：节点从第13行开始：13不匹配的树节点：UP期望SEMICOLON编译器\ Walker.g：节点从第14:13行不匹配的树节点：0期待SEMICOLON编译器\ Walker.g：节点从第16：9行不匹配的树节点：+期待SEMICOLON编译器\ Walker .g：来自第16:10行的节点不匹配的树节点：1期望SEMICOLON编译器\ Walker.g：节点从第19：6行不匹配的树节点：UP期望SEMICOLON编译器\ Walker.g：节点从第20行：4行不匹配树节点：EXPRESSION_LIST期待SEMICOLON 编译器\ Walker.g：节点从20:28后不匹配的树节点：UP期望SEMICOLON编译器\ Walker.g：节点从第22行：4不匹配的树节点：EXPRESSION_LIST期待SEMICOLON 编译器\ Walker.g：节点从22:41后不匹配的树节点：UP期待SEMICOLON
答案 0 :(得分：0)
您需要指定AST节点类型。如果未指定，则生成的代码中使用的默认值仅为Object。
options {
ASTLabelType=CommonTree;
}