diff --git a/.gitignore b/.gitignore
index 81a5dc1..9c3e147 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,2 +1,3 @@
 build/
-.antlr/
\ No newline at end of file
+.antlr/
+*.log
\ No newline at end of file
diff --git a/Sysy.g4 b/Sysy.g4
index 52f5b53..8a3b45d 100644
--- a/Sysy.g4
+++ b/Sysy.g4
@@ -87,6 +87,40 @@ constExp: addExp; // 注：使用的 Ident 必须是常量
 
 // -------- Terminals ---------
 
+CONST: 'const';
+COMMA: ',';
+SEMICOLON: ';';
+INT: 'int';
+LBRACKET: '[';
+RBRACKET: ']';
+ASSIGN: '=';
+LBRACE: '{';
+RBRACE: '}';
+LPAREN: '(';
+RPAREN: ')';
+VOID: 'void';
+IF: 'if';
+ELSE: 'else';
+WHILE: 'while';
+BREAK: 'break';
+CONTINUE: 'continue';
+RETURN: 'return';
+ADD: '+';
+SUB: '-';
+NOT: '!';
+MUL: '*';
+DIV: '/';
+MOD: '%';
+LT: '<';
+GT: '>';
+LE: '<=';
+GE: '>=';
+EQ: '==';
+NE: '!=';
+AND: '&&';
+OR: '||';
+DQUOTE: '"';
+
 IDENT: [_a-zA-Z] | [_a-zA-Z] [_a-zA-Z0-9]+;
 
 DECIMAL_CONST: [1-9] | [1-9] [0-9]+;
@@ -110,40 +144,7 @@ fragment SChar:
 	~["\\\r\n]
 	| EscapeSequence
 	| '\\\n' // Added line
-	| '\\\r\n' ; // Added line
+	| '\\\r\n'; // Added line
 
-StringLiteral: '"' (SChar+)? '"';
-// https://github.com/antlr/antlr4/blob/master/doc/lexer-rules.md
-
-CONST:'const';
-COMMA:',';
-SEMICOLON:';';
-INT:'int';
-LBRACKET:'[';
-RBRACKET:']';
-ASSING:'=';
-LBRACE:'{';
-RBRACE:'}';
-LPAREN:'(';
-RPAREN:')';
-VOID:'void';
-IF:'if';
-ELSE:'else';
-WHILE:'while';
-BREAK:'break';
-CONTINUE:'continue';
-RETURN:'return';
-ADD:'+';
-SUB:'-';
-NOT:'!';
-MUL:'*';
-DIV:'/';
-MOD:'%';
-LT:'<';
-GT:'>';
-LE:'<=';
-GE:'>=';
-EQ:'==';
-NE:'!=';
-AND:'&&';
-OR:'||';
+StringLiteral: DQUOTE (SChar+)? DQUOTE;
+// https://github.com/antlr/antlr4/blob/master/doc/lexer-rules.md
\ No newline at end of file
diff --git a/include/antlrgen/SysyLexer.h b/include/antlrgen/SysyLexer.h
index 4b2dada..e1606f1 100644
--- a/include/antlrgen/SysyLexer.h
+++ b/include/antlrgen/SysyLexer.h
@@ -13,13 +13,13 @@ namespace antlrSysY {
 class  SysyLexer : public antlr4::Lexer {
 public:
   enum {
-    IDENT = 1, DECIMAL_CONST = 2, OCTAL_CONST = 3, HEXADECIMAL_CONST = 4, 
-    WS = 5, SINGLELINE_COMMENT = 6, MULTILINE_COMMENT = 7, StringLiteral = 8, 
-    CONST = 9, COMMA = 10, SEMICOLON = 11, INT = 12, LBRACKET = 13, RBRACKET = 14, 
-    ASSING = 15, LBRACE = 16, RBRACE = 17, LPAREN = 18, RPAREN = 19, VOID = 20, 
-    IF = 21, ELSE = 22, WHILE = 23, BREAK = 24, CONTINUE = 25, RETURN = 26, 
-    ADD = 27, SUB = 28, NOT = 29, MUL = 30, DIV = 31, MOD = 32, LT = 33, 
-    GT = 34, LE = 35, GE = 36, EQ = 37, NE = 38, AND = 39, OR = 40
+    CONST = 1, COMMA = 2, SEMICOLON = 3, INT = 4, LBRACKET = 5, RBRACKET = 6, 
+    ASSIGN = 7, LBRACE = 8, RBRACE = 9, LPAREN = 10, RPAREN = 11, VOID = 12, 
+    IF = 13, ELSE = 14, WHILE = 15, BREAK = 16, CONTINUE = 17, RETURN = 18, 
+    ADD = 19, SUB = 20, NOT = 21, MUL = 22, DIV = 23, MOD = 24, LT = 25, 
+    GT = 26, LE = 27, GE = 28, EQ = 29, NE = 30, AND = 31, OR = 32, DQUOTE = 33, 
+    IDENT = 34, DECIMAL_CONST = 35, OCTAL_CONST = 36, HEXADECIMAL_CONST = 37, 
+    WS = 38, SINGLELINE_COMMENT = 39, MULTILINE_COMMENT = 40, StringLiteral = 41
   };
 
   explicit SysyLexer(antlr4::CharStream *input);
diff --git a/include/antlrgen/SysyParser.h b/include/antlrgen/SysyParser.h
index 4e3acb0..63beae7 100644
--- a/include/antlrgen/SysyParser.h
+++ b/include/antlrgen/SysyParser.h
@@ -13,13 +13,13 @@ namespace antlrSysY {
 class  SysyParser : public antlr4::Parser {
 public:
   enum {
-    IDENT = 1, DECIMAL_CONST = 2, OCTAL_CONST = 3, HEXADECIMAL_CONST = 4, 
-    WS = 5, SINGLELINE_COMMENT = 6, MULTILINE_COMMENT = 7, StringLiteral = 8, 
-    CONST = 9, COMMA = 10, SEMICOLON = 11, INT = 12, LBRACKET = 13, RBRACKET = 14, 
-    ASSING = 15, LBRACE = 16, RBRACE = 17, LPAREN = 18, RPAREN = 19, VOID = 20, 
-    IF = 21, ELSE = 22, WHILE = 23, BREAK = 24, CONTINUE = 25, RETURN = 26, 
-    ADD = 27, SUB = 28, NOT = 29, MUL = 30, DIV = 31, MOD = 32, LT = 33, 
-    GT = 34, LE = 35, GE = 36, EQ = 37, NE = 38, AND = 39, OR = 40
+    CONST = 1, COMMA = 2, SEMICOLON = 3, INT = 4, LBRACKET = 5, RBRACKET = 6, 
+    ASSIGN = 7, LBRACE = 8, RBRACE = 9, LPAREN = 10, RPAREN = 11, VOID = 12, 
+    IF = 13, ELSE = 14, WHILE = 15, BREAK = 16, CONTINUE = 17, RETURN = 18, 
+    ADD = 19, SUB = 20, NOT = 21, MUL = 22, DIV = 23, MOD = 24, LT = 25, 
+    GT = 26, LE = 27, GE = 28, EQ = 29, NE = 30, AND = 31, OR = 32, DQUOTE = 33, 
+    IDENT = 34, DECIMAL_CONST = 35, OCTAL_CONST = 36, HEXADECIMAL_CONST = 37, 
+    WS = 38, SINGLELINE_COMMENT = 39, MULTILINE_COMMENT = 40, StringLiteral = 41
   };
 
   enum {
@@ -166,7 +166,7 @@ public:
     ConstDefContext(antlr4::ParserRuleContext *parent, size_t invokingState);
     virtual size_t getRuleIndex() const override;
     antlr4::tree::TerminalNode *IDENT();
-    antlr4::tree::TerminalNode *ASSING();
+    antlr4::tree::TerminalNode *ASSIGN();
     ConstInitValContext *constInitVal();
     std::vector<antlr4::tree::TerminalNode *> LBRACKET();
     antlr4::tree::TerminalNode* LBRACKET(size_t i);
@@ -196,8 +196,7 @@ public:
 
 
     virtual std::any accept(antlr4::tree::ParseTreeVisitor *visitor) override;
-  public:
-    std::vector<int> arrDim;
+   
   };
 
   ConstInitValContext* constInitVal();
@@ -231,7 +230,7 @@ public:
     ConstExpContext* constExp(size_t i);
     std::vector<antlr4::tree::TerminalNode *> RBRACKET();
     antlr4::tree::TerminalNode* RBRACKET(size_t i);
-    antlr4::tree::TerminalNode *ASSING();
+    antlr4::tree::TerminalNode *ASSIGN();
     InitValContext *initVal();
 
 
@@ -413,7 +412,7 @@ public:
     AssignStmtContext(StmtContext *ctx);
 
     LValContext *lVal();
-    antlr4::tree::TerminalNode *ASSING();
+    antlr4::tree::TerminalNode *ASSIGN();
     ExpContext *exp();
     antlr4::tree::TerminalNode *SEMICOLON();
 
diff --git a/include/common.h b/include/common.h
new file mode 100644
index 0000000..ca0390f
--- /dev/null
+++ b/include/common.h
@@ -0,0 +1,43 @@
+#pragma once
+#include "3rdparty/easylogging++.h"
+
+#include <any>
+#include <exception>
+#include <optional>
+#include <sstream>
+#include <string>
+
+#define panic(message)                                                         \
+  do {                                                                         \
+    throw GrammarException(__FILE__, __LINE__, message);                       \
+  } while (0)
+
+#define sysy_assert(cond)                                                      \
+  do {                                                                         \
+    if (!(cond))                                                               \
+      GrammarException(__FILE__, __LINE__, #cond);                             \
+  } while (0)
+
+namespace antlrSysY {
+
+class GrammarException : public std::exception {
+public:
+  GrammarException() : message("Unknown Grammar Exception") {}
+  GrammarException(const std::string &what_arg) : message(what_arg){};
+  GrammarException(const char *what_arg) : message(what_arg){};
+  GrammarException(const char *filename, int line,
+                   const std::string &what_arg) {
+    std::stringstream ss;
+    ss << filename << ":" << line << ": " << what_arg;
+    ss >> message;
+  };
+
+  virtual const char *what() const noexcept {
+    return message.c_str();
+  }
+
+private:
+  std::string message;
+};
+
+} // namespace antlrSysY
\ No newline at end of file
diff --git a/include/llir_type.h b/include/llir_type.h
new file mode 100644
index 0000000..f8790d8
--- /dev/null
+++ b/include/llir_type.h
@@ -0,0 +1,13 @@
+#pragma once
+
+namespace antlrSysY {
+
+enum class Type {
+  IntegerType,
+  FunctionType,
+  ArrayType,
+  PointerType,
+  VectorType,
+};
+
+} // namespace antlrSysY
\ No newline at end of file
diff --git a/include/llir_value.h b/include/llir_value.h
new file mode 100644
index 0000000..1071c9a
--- /dev/null
+++ b/include/llir_value.h
@@ -0,0 +1,31 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include "llir_type.h"
+
+namespace antlrSysY {
+class Value {
+public:
+  std::string name;
+  Type type;
+  Value(const std::string &name, const Type &type) : name(name), type(type) {}
+  virtual ~Value() = default;
+};
+
+class Function : public Value {};
+
+class BasicBlock : public Value {};
+
+class ConstantInt : public Value {
+public:
+  int value;
+  int is_bool; // bool 0 or int 1
+  ConstantInt(const std::string &name, int value, int is_bool)
+      : Value(name, Type::IntegerType), value(value), is_bool(is_bool) {}
+};
+
+class ConstantArr : public Value {};
+
+} // namespace antlrSysY
\ No newline at end of file
diff --git a/include/scopetable.h b/include/scopetable.h
new file mode 100644
index 0000000..b8b99d3
--- /dev/null
+++ b/include/scopetable.h
@@ -0,0 +1,56 @@
+#pragma once
+#include "common.h"
+
+namespace antlrSysY {
+template <typename T_V> class ScopeTable {
+
+  typedef std::map<std::string, T_V> ScopeTableEntry_t;
+
+private:
+  std::vector<ScopeTableEntry_t> _scope_list;
+
+public:
+  // On init, there is already an empty scope
+  ScopeTable() {
+    _scope_list.push_back(ScopeTableEntry_t());
+  }
+  ~ScopeTable() {}
+
+  void enter_scope() {
+    _scope_list.push_back(ScopeTableEntry_t());
+  };
+
+  void leave_scope() {
+    if (_scope_list.size() <= 1)
+      throw GrammarException("Unable to leave global scope");
+    _scope_list.pop_back();
+  };
+
+  void push_name(const std::string &name, const T_V &value) {
+    auto &current_scope = _scope_list.back();
+
+    if (current_scope.count(name))
+      throw GrammarException("Duplicate name in current scope");
+    current_scope[name] = value;
+  };
+
+  std::optional<T_V> get_name(const std::string &name) {
+    for (auto i = _scope_list.size() - 1; i >= 0; --i) {
+      if (_scope_list[i].count(name)) {
+        return {_scope_list[i][name]};
+      }
+    }
+    return {};
+  };
+
+  std::optional<T_V> get_name(const std::string &name, int level) {
+    if (_scope_list[level].count(name)) {
+      return {_scope_list[level][name]};
+    }
+    return {};
+  };
+  int get_level() const {
+    return _scope_list.size() - 1;
+  }
+};
+}
\ No newline at end of file
diff --git a/include/visitor.h b/include/visitor.h
new file mode 100644
index 0000000..b166bf5
--- /dev/null
+++ b/include/visitor.h
@@ -0,0 +1,80 @@
+#pragma once
+#include "3rdparty/easylogging++.h"
+#include "antlrgen/SysyBaseVisitor.h"
+
+#include <any>
+#include <cstddef>
+#include <map>
+#include <optional>
+#include <string>
+#include <vector>
+#include <memory>
+
+#include "antlrgen/SysyLexer.h"
+#include "antlrgen/SysyParser.h"
+#include "common.h"
+#include "llir_value.h"
+#include "scopetable.h"
+
+namespace antlrSysY {
+
+class Visitor : public antlrSysY::SysyBaseVisitor {
+private:
+  struct VisitorState {
+
+    bool isConstInt = false;
+  };
+
+private:
+  ScopeTable<std::shared_ptr<Value>> _scope_tab;
+  VisitorState _state = {};
+  std::map<std::string, size_t> token_type_map;
+
+public:
+  Visitor(SysyLexer &lexer) {
+    for (auto item : lexer.getTokenTypeMap()) {
+      token_type_map[std::string(item.first)] = item.second;
+    }
+  }
+  std::any visitProgram(SysyParser::ProgramContext *ctx) override {
+    // before visiting, we add some lib functions
+    return this->SysyBaseVisitor::visitProgram(ctx);
+  }
+
+  std::any visitCompUnit(SysyParser::CompUnitContext *ctx) override {
+    return this->visitChildren(ctx);
+  }
+
+  std::any visitDecl(SysyParser::DeclContext *ctx) override {
+    return this->visitChildren(ctx);
+  }
+
+  std::any visitConstDecl(SysyParser::ConstDeclContext *ctx) override;
+
+  // constDef : IDENT ('[' constExp ']')* '=' constInitVal ';'
+  std::any visitConstDef(SysyParser::ConstDefContext *ctx) override;
+
+  std::any visitConstInitVal(SysyParser::ConstInitValContext *ctx) override;
+
+  std::any visitConstExp(SysyParser::ConstExpContext *ctx) override;
+  // addExp: mulExp | addExp ('+' | '-') mulExp;
+  std::any visitAddExp(SysyParser::AddExpContext *ctx) override;
+
+  std::any visitMulExp(SysyParser::MulExpContext *ctx) override;
+
+  // unaryExp: primaryExp | IDENT '(' (funcRParams)? ')' | unaryOp unaryExp;
+  std::any visitUnaryExp(SysyParser::UnaryExpContext *ctx) override;
+
+  // primaryExp: ('(' exp ')') | lVal | number;
+  std::any visitPrimaryExp(SysyParser::PrimaryExpContext *ctx) override;
+
+  // std::any visitExp(SysyParser::ExpContext *ctx) override {  }
+
+  std::any visitNumber(SysyParser::NumberContext *ctx) override;
+
+  std::any visitIntConst(SysyParser::IntConstContext *ctx) override;
+
+  std::any visitLVal(SysyParser::LValContext *) override;
+};
+
+} // namespace antlrSysY
\ No newline at end of file
diff --git a/scripts/antlr4-gen.sh b/scripts/antlr4-gen.sh
index 4214116..be4afd2 100755
--- a/scripts/antlr4-gen.sh
+++ b/scripts/antlr4-gen.sh
@@ -4,6 +4,7 @@ mkdir -p build/antlr-gen
 mkdir -p include
 mkdir -p src
 rm -fv build/antlr-gen/*
+cp $filename build/antlr-gen/
 java -jar ./tools/antlr-4.12.0-complete.jar -no-listener -visitor -Dlanguage=Cpp -package antlrSysY -o build/antlr-gen $filename
 mkdir -p src/antlrgen
 mkdir -p include/antlrgen
diff --git a/src/antlrgen/SysyLexer.cpp b/src/antlrgen/SysyLexer.cpp
index 61cdff4..7429cbf 100644
--- a/src/antlrgen/SysyLexer.cpp
+++ b/src/antlrgen/SysyLexer.cpp
@@ -49,13 +49,13 @@ void sysylexerLexerInitialize() {
   assert(sysylexerLexerStaticData == nullptr);
   auto staticData = std::make_unique<SysyLexerStaticData>(
     std::vector<std::string>{
+      "CONST", "COMMA", "SEMICOLON", "INT", "LBRACKET", "RBRACKET", "ASSIGN", 
+      "LBRACE", "RBRACE", "LPAREN", "RPAREN", "VOID", "IF", "ELSE", "WHILE", 
+      "BREAK", "CONTINUE", "RETURN", "ADD", "SUB", "NOT", "MUL", "DIV", 
+      "MOD", "LT", "GT", "LE", "GE", "EQ", "NE", "AND", "OR", "DQUOTE", 
       "IDENT", "DECIMAL_CONST", "OCTAL_CONST", "HEXADECIMAL_CONST", "WS", 
       "SINGLELINE_COMMENT", "MULTILINE_COMMENT", "EscapeSequence", "SChar", 
-      "StringLiteral", "CONST", "COMMA", "SEMICOLON", "INT", "LBRACKET", 
-      "RBRACKET", "ASSING", "LBRACE", "RBRACE", "LPAREN", "RPAREN", "VOID", 
-      "IF", "ELSE", "WHILE", "BREAK", "CONTINUE", "RETURN", "ADD", "SUB", 
-      "NOT", "MUL", "DIV", "MOD", "LT", "GT", "LE", "GE", "EQ", "NE", "AND", 
-      "OR"
+      "StringLiteral"
     },
     std::vector<std::string>{
       "DEFAULT_TOKEN_CHANNEL", "HIDDEN"
@@ -64,123 +64,124 @@ void sysylexerLexerInitialize() {
       "DEFAULT_MODE"
     },
     std::vector<std::string>{
-      "", "", "", "", "", "", "", "", "", "'const'", "','", "';'", "'int'", 
-      "'['", "']'", "'='", "'{'", "'}'", "'('", "')'", "'void'", "'if'", 
-      "'else'", "'while'", "'break'", "'continue'", "'return'", "'+'", "'-'", 
-      "'!'", "'*'", "'/'", "'%'", "'<'", "'>'", "'<='", "'>='", "'=='", 
-      "'!='", "'&&'", "'||'"
+      "", "'const'", "','", "';'", "'int'", "'['", "']'", "'='", "'{'", 
+      "'}'", "'('", "')'", "'void'", "'if'", "'else'", "'while'", "'break'", 
+      "'continue'", "'return'", "'+'", "'-'", "'!'", "'*'", "'/'", "'%'", 
+      "'<'", "'>'", "'<='", "'>='", "'=='", "'!='", "'&&'", "'||'", "'\"'"
     },
     std::vector<std::string>{
-      "", "IDENT", "DECIMAL_CONST", "OCTAL_CONST", "HEXADECIMAL_CONST", 
-      "WS", "SINGLELINE_COMMENT", "MULTILINE_COMMENT", "StringLiteral", 
-      "CONST", "COMMA", "SEMICOLON", "INT", "LBRACKET", "RBRACKET", "ASSING", 
-      "LBRACE", "RBRACE", "LPAREN", "RPAREN", "VOID", "IF", "ELSE", "WHILE", 
-      "BREAK", "CONTINUE", "RETURN", "ADD", "SUB", "NOT", "MUL", "DIV", 
-      "MOD", "LT", "GT", "LE", "GE", "EQ", "NE", "AND", "OR"
+      "", "CONST", "COMMA", "SEMICOLON", "INT", "LBRACKET", "RBRACKET", 
+      "ASSIGN", "LBRACE", "RBRACE", "LPAREN", "RPAREN", "VOID", "IF", "ELSE", 
+      "WHILE", "BREAK", "CONTINUE", "RETURN", "ADD", "SUB", "NOT", "MUL", 
+      "DIV", "MOD", "LT", "GT", "LE", "GE", "EQ", "NE", "AND", "OR", "DQUOTE", 
+      "IDENT", "DECIMAL_CONST", "OCTAL_CONST", "HEXADECIMAL_CONST", "WS", 
+      "SINGLELINE_COMMENT", "MULTILINE_COMMENT", "StringLiteral"
     }
   );
   static const int32_t serializedATNSegment[] = {
-  	4,0,40,297,6,-1,2,0,7,0,2,1,7,1,2,2,7,2,2,3,7,3,2,4,7,4,2,5,7,5,2,6,7,
+  	4,0,41,301,6,-1,2,0,7,0,2,1,7,1,2,2,7,2,2,3,7,3,2,4,7,4,2,5,7,5,2,6,7,
   	6,2,7,7,7,2,8,7,8,2,9,7,9,2,10,7,10,2,11,7,11,2,12,7,12,2,13,7,13,2,14,
   	7,14,2,15,7,15,2,16,7,16,2,17,7,17,2,18,7,18,2,19,7,19,2,20,7,20,2,21,
   	7,21,2,22,7,22,2,23,7,23,2,24,7,24,2,25,7,25,2,26,7,26,2,27,7,27,2,28,
   	7,28,2,29,7,29,2,30,7,30,2,31,7,31,2,32,7,32,2,33,7,33,2,34,7,34,2,35,
-  	7,35,2,36,7,36,2,37,7,37,2,38,7,38,2,39,7,39,2,40,7,40,2,41,7,41,1,0,
-  	1,0,1,0,4,0,89,8,0,11,0,12,0,90,3,0,93,8,0,1,1,1,1,1,1,4,1,98,8,1,11,
-  	1,12,1,99,3,1,102,8,1,1,2,1,2,1,2,4,2,107,8,2,11,2,12,2,108,3,2,111,8,
-  	2,1,3,1,3,1,3,1,3,3,3,117,8,3,1,3,4,3,120,8,3,11,3,12,3,121,1,4,4,4,125,
-  	8,4,11,4,12,4,126,1,4,1,4,1,5,1,5,1,5,1,5,5,5,135,8,5,10,5,12,5,138,9,
-  	5,1,5,1,5,1,6,1,6,1,6,1,6,5,6,146,8,6,10,6,12,6,149,9,6,1,6,1,6,1,6,1,
-  	6,1,6,1,7,1,7,1,7,1,7,1,7,3,7,161,8,7,1,7,3,7,164,8,7,1,7,1,7,1,7,1,7,
-  	4,7,170,8,7,11,7,12,7,171,3,7,174,8,7,1,8,1,8,1,8,1,8,1,8,1,8,1,8,3,8,
-  	183,8,8,1,9,1,9,4,9,187,8,9,11,9,12,9,188,3,9,191,8,9,1,9,1,9,1,10,1,
-  	10,1,10,1,10,1,10,1,10,1,11,1,11,1,12,1,12,1,13,1,13,1,13,1,13,1,14,1,
-  	14,1,15,1,15,1,16,1,16,1,17,1,17,1,18,1,18,1,19,1,19,1,20,1,20,1,21,1,
-  	21,1,21,1,21,1,21,1,22,1,22,1,22,1,23,1,23,1,23,1,23,1,23,1,24,1,24,1,
-  	24,1,24,1,24,1,24,1,25,1,25,1,25,1,25,1,25,1,25,1,26,1,26,1,26,1,26,1,
-  	26,1,26,1,26,1,26,1,26,1,27,1,27,1,27,1,27,1,27,1,27,1,27,1,28,1,28,1,
-  	29,1,29,1,30,1,30,1,31,1,31,1,32,1,32,1,33,1,33,1,34,1,34,1,35,1,35,1,
-  	36,1,36,1,36,1,37,1,37,1,37,1,38,1,38,1,38,1,39,1,39,1,39,1,40,1,40,1,
-  	40,1,41,1,41,1,41,1,147,0,42,1,1,3,2,5,3,7,4,9,5,11,6,13,7,15,0,17,0,
-  	19,8,21,9,23,10,25,11,27,12,29,13,31,14,33,15,35,16,37,17,39,18,41,19,
-  	43,20,45,21,47,22,49,23,51,24,53,25,55,26,57,27,59,28,61,29,63,30,65,
-  	31,67,32,69,33,71,34,73,35,75,36,77,37,79,38,81,39,83,40,1,0,10,3,0,65,
-  	90,95,95,97,122,4,0,48,57,65,90,95,95,97,122,1,0,49,57,1,0,48,57,1,0,
-  	48,55,3,0,48,57,65,70,97,102,3,0,9,10,13,13,32,32,2,0,10,10,13,13,10,
-  	0,34,34,39,39,63,63,92,92,97,98,102,102,110,110,114,114,116,116,118,118,
-  	4,0,10,10,13,13,34,34,92,92,315,0,1,1,0,0,0,0,3,1,0,0,0,0,5,1,0,0,0,0,
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+  	7,35,2,36,7,36,2,37,7,37,2,38,7,38,2,39,7,39,2,40,7,40,2,41,7,41,2,42,
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+  	1,11,1,12,1,12,1,12,1,13,1,13,1,13,1,13,1,13,1,14,1,14,1,14,1,14,1,14,
+  	1,14,1,15,1,15,1,15,1,15,1,15,1,15,1,16,1,16,1,16,1,16,1,16,1,16,1,16,
+  	1,16,1,16,1,17,1,17,1,17,1,17,1,17,1,17,1,17,1,18,1,18,1,19,1,19,1,20,
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+  	1,31,1,32,1,32,1,33,1,33,1,33,4,33,196,8,33,11,33,12,33,197,3,33,200,
+  	8,33,1,34,1,34,1,34,4,34,205,8,34,11,34,12,34,206,3,34,209,8,34,1,35,
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+  	37,11,37,12,37,233,1,37,1,37,1,38,1,38,1,38,1,38,5,38,242,8,38,10,38,
+  	12,38,245,9,38,1,38,1,38,1,39,1,39,1,39,1,39,5,39,253,8,39,10,39,12,39,
+  	256,9,39,1,39,1,39,1,39,1,39,1,39,1,40,1,40,1,40,1,40,1,40,3,40,268,8,
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+  	3,40,281,8,40,1,41,1,41,1,41,1,41,1,41,1,41,1,41,3,41,290,8,41,1,42,1,
+  	42,4,42,294,8,42,11,42,12,42,295,3,42,298,8,42,1,42,1,42,1,254,0,43,1,
+  	1,3,2,5,3,7,4,9,5,11,6,13,7,15,8,17,9,19,10,21,11,23,12,25,13,27,14,29,
+  	15,31,16,33,17,35,18,37,19,39,20,41,21,43,22,45,23,47,24,49,25,51,26,
+  	53,27,55,28,57,29,59,30,61,31,63,32,65,33,67,34,69,35,71,36,73,37,75,
+  	38,77,39,79,40,81,0,83,0,85,41,1,0,10,3,0,65,90,95,95,97,122,4,0,48,57,
+  	65,90,95,95,97,122,1,0,49,57,1,0,48,57,1,0,48,55,3,0,48,57,65,70,97,102,
+  	3,0,9,10,13,13,32,32,2,0,10,10,13,13,10,0,34,34,39,39,63,63,92,92,97,
+  	98,102,102,110,110,114,114,116,116,118,118,4,0,10,10,13,13,34,34,92,92,
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-  	0,0,0,13,141,1,0,0,0,15,173,1,0,0,0,17,182,1,0,0,0,19,184,1,0,0,0,21,
-  	194,1,0,0,0,23,200,1,0,0,0,25,202,1,0,0,0,27,204,1,0,0,0,29,208,1,0,0,
-  	0,31,210,1,0,0,0,33,212,1,0,0,0,35,214,1,0,0,0,37,216,1,0,0,0,39,218,
-  	1,0,0,0,41,220,1,0,0,0,43,222,1,0,0,0,45,227,1,0,0,0,47,230,1,0,0,0,49,
-  	235,1,0,0,0,51,241,1,0,0,0,53,247,1,0,0,0,55,256,1,0,0,0,57,263,1,0,0,
-  	0,59,265,1,0,0,0,61,267,1,0,0,0,63,269,1,0,0,0,65,271,1,0,0,0,67,273,
-  	1,0,0,0,69,275,1,0,0,0,71,277,1,0,0,0,73,279,1,0,0,0,75,282,1,0,0,0,77,
-  	285,1,0,0,0,79,288,1,0,0,0,81,291,1,0,0,0,83,294,1,0,0,0,85,93,7,0,0,
-  	0,86,88,7,0,0,0,87,89,7,1,0,0,88,87,1,0,0,0,89,90,1,0,0,0,90,88,1,0,0,
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-  	128,1,0,0,0,128,129,6,4,0,0,129,10,1,0,0,0,130,131,5,47,0,0,131,132,5,
-  	47,0,0,132,136,1,0,0,0,133,135,8,7,0,0,134,133,1,0,0,0,135,138,1,0,0,
-  	0,136,134,1,0,0,0,136,137,1,0,0,0,137,139,1,0,0,0,138,136,1,0,0,0,139,
-  	140,6,5,0,0,140,12,1,0,0,0,141,142,5,47,0,0,142,143,5,42,0,0,143,147,
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-  	152,5,47,0,0,152,153,1,0,0,0,153,154,6,6,0,0,154,14,1,0,0,0,155,156,5,
-  	92,0,0,156,174,7,8,0,0,157,158,5,92,0,0,158,160,7,4,0,0,159,161,7,4,0,
-  	0,160,159,1,0,0,0,160,161,1,0,0,0,161,163,1,0,0,0,162,164,7,4,0,0,163,
-  	162,1,0,0,0,163,164,1,0,0,0,164,174,1,0,0,0,165,166,5,92,0,0,166,167,
-  	5,120,0,0,167,169,1,0,0,0,168,170,7,5,0,0,169,168,1,0,0,0,170,171,1,0,
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-  	157,1,0,0,0,173,165,1,0,0,0,174,16,1,0,0,0,175,183,8,9,0,0,176,183,3,
-  	15,7,0,177,178,5,92,0,0,178,183,5,10,0,0,179,180,5,92,0,0,180,181,5,13,
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-  	182,179,1,0,0,0,183,18,1,0,0,0,184,190,5,34,0,0,185,187,3,17,8,0,186,
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-  	0,193,20,1,0,0,0,194,195,5,99,0,0,195,196,5,111,0,0,196,197,5,110,0,0,
-  	197,198,5,115,0,0,198,199,5,116,0,0,199,22,1,0,0,0,200,201,5,44,0,0,201,
-  	24,1,0,0,0,202,203,5,59,0,0,203,26,1,0,0,0,204,205,5,105,0,0,205,206,
-  	5,110,0,0,206,207,5,116,0,0,207,28,1,0,0,0,208,209,5,91,0,0,209,30,1,
-  	0,0,0,210,211,5,93,0,0,211,32,1,0,0,0,212,213,5,61,0,0,213,34,1,0,0,0,
-  	214,215,5,123,0,0,215,36,1,0,0,0,216,217,5,125,0,0,217,38,1,0,0,0,218,
-  	219,5,40,0,0,219,40,1,0,0,0,220,221,5,41,0,0,221,42,1,0,0,0,222,223,5,
-  	118,0,0,223,224,5,111,0,0,224,225,5,105,0,0,225,226,5,100,0,0,226,44,
-  	1,0,0,0,227,228,5,105,0,0,228,229,5,102,0,0,229,46,1,0,0,0,230,231,5,
-  	101,0,0,231,232,5,108,0,0,232,233,5,115,0,0,233,234,5,101,0,0,234,48,
-  	1,0,0,0,235,236,5,119,0,0,236,237,5,104,0,0,237,238,5,105,0,0,238,239,
-  	5,108,0,0,239,240,5,101,0,0,240,50,1,0,0,0,241,242,5,98,0,0,242,243,5,
-  	114,0,0,243,244,5,101,0,0,244,245,5,97,0,0,245,246,5,107,0,0,246,52,1,
-  	0,0,0,247,248,5,99,0,0,248,249,5,111,0,0,249,250,5,110,0,0,250,251,5,
-  	116,0,0,251,252,5,105,0,0,252,253,5,110,0,0,253,254,5,117,0,0,254,255,
-  	5,101,0,0,255,54,1,0,0,0,256,257,5,114,0,0,257,258,5,101,0,0,258,259,
-  	5,116,0,0,259,260,5,117,0,0,260,261,5,114,0,0,261,262,5,110,0,0,262,56,
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-  	0,267,268,5,33,0,0,268,62,1,0,0,0,269,270,5,42,0,0,270,64,1,0,0,0,271,
-  	272,5,47,0,0,272,66,1,0,0,0,273,274,5,37,0,0,274,68,1,0,0,0,275,276,5,
-  	60,0,0,276,70,1,0,0,0,277,278,5,62,0,0,278,72,1,0,0,0,279,280,5,60,0,
-  	0,280,281,5,61,0,0,281,74,1,0,0,0,282,283,5,62,0,0,283,284,5,61,0,0,284,
-  	76,1,0,0,0,285,286,5,61,0,0,286,287,5,61,0,0,287,78,1,0,0,0,288,289,5,
-  	33,0,0,289,290,5,61,0,0,290,80,1,0,0,0,291,292,5,38,0,0,292,293,5,38,
-  	0,0,293,82,1,0,0,0,294,295,5,124,0,0,295,296,5,124,0,0,296,84,1,0,0,0,
-  	19,0,90,92,99,101,108,110,116,121,126,136,147,160,163,171,173,182,188,
-  	190,1,6,0,0
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+  	165,5,47,0,0,165,46,1,0,0,0,166,167,5,37,0,0,167,48,1,0,0,0,168,169,5,
+  	60,0,0,169,50,1,0,0,0,170,171,5,62,0,0,171,52,1,0,0,0,172,173,5,60,0,
+  	0,173,174,5,61,0,0,174,54,1,0,0,0,175,176,5,62,0,0,176,177,5,61,0,0,177,
+  	56,1,0,0,0,178,179,5,61,0,0,179,180,5,61,0,0,180,58,1,0,0,0,181,182,5,
+  	33,0,0,182,183,5,61,0,0,183,60,1,0,0,0,184,185,5,38,0,0,185,186,5,38,
+  	0,0,186,62,1,0,0,0,187,188,5,124,0,0,188,189,5,124,0,0,189,64,1,0,0,0,
+  	190,191,5,34,0,0,191,66,1,0,0,0,192,200,7,0,0,0,193,195,7,0,0,0,194,196,
+  	7,1,0,0,195,194,1,0,0,0,196,197,1,0,0,0,197,195,1,0,0,0,197,198,1,0,0,
+  	0,198,200,1,0,0,0,199,192,1,0,0,0,199,193,1,0,0,0,200,68,1,0,0,0,201,
+  	209,7,2,0,0,202,204,7,2,0,0,203,205,7,3,0,0,204,203,1,0,0,0,205,206,1,
+  	0,0,0,206,204,1,0,0,0,206,207,1,0,0,0,207,209,1,0,0,0,208,201,1,0,0,0,
+  	208,202,1,0,0,0,209,70,1,0,0,0,210,218,5,48,0,0,211,213,5,48,0,0,212,
+  	214,7,4,0,0,213,212,1,0,0,0,214,215,1,0,0,0,215,213,1,0,0,0,215,216,1,
+  	0,0,0,216,218,1,0,0,0,217,210,1,0,0,0,217,211,1,0,0,0,218,72,1,0,0,0,
+  	219,220,5,48,0,0,220,224,5,120,0,0,221,222,5,48,0,0,222,224,5,88,0,0,
+  	223,219,1,0,0,0,223,221,1,0,0,0,224,226,1,0,0,0,225,227,7,5,0,0,226,225,
+  	1,0,0,0,227,228,1,0,0,0,228,226,1,0,0,0,228,229,1,0,0,0,229,74,1,0,0,
+  	0,230,232,7,6,0,0,231,230,1,0,0,0,232,233,1,0,0,0,233,231,1,0,0,0,233,
+  	234,1,0,0,0,234,235,1,0,0,0,235,236,6,37,0,0,236,76,1,0,0,0,237,238,5,
+  	47,0,0,238,239,5,47,0,0,239,243,1,0,0,0,240,242,8,7,0,0,241,240,1,0,0,
+  	0,242,245,1,0,0,0,243,241,1,0,0,0,243,244,1,0,0,0,244,246,1,0,0,0,245,
+  	243,1,0,0,0,246,247,6,38,0,0,247,78,1,0,0,0,248,249,5,47,0,0,249,250,
+  	5,42,0,0,250,254,1,0,0,0,251,253,9,0,0,0,252,251,1,0,0,0,253,256,1,0,
+  	0,0,254,255,1,0,0,0,254,252,1,0,0,0,255,257,1,0,0,0,256,254,1,0,0,0,257,
+  	258,5,42,0,0,258,259,5,47,0,0,259,260,1,0,0,0,260,261,6,39,0,0,261,80,
+  	1,0,0,0,262,263,5,92,0,0,263,281,7,8,0,0,264,265,5,92,0,0,265,267,7,4,
+  	0,0,266,268,7,4,0,0,267,266,1,0,0,0,267,268,1,0,0,0,268,270,1,0,0,0,269,
+  	271,7,4,0,0,270,269,1,0,0,0,270,271,1,0,0,0,271,281,1,0,0,0,272,273,5,
+  	92,0,0,273,274,5,120,0,0,274,276,1,0,0,0,275,277,7,5,0,0,276,275,1,0,
+  	0,0,277,278,1,0,0,0,278,276,1,0,0,0,278,279,1,0,0,0,279,281,1,0,0,0,280,
+  	262,1,0,0,0,280,264,1,0,0,0,280,272,1,0,0,0,281,82,1,0,0,0,282,290,8,
+  	9,0,0,283,290,3,81,40,0,284,285,5,92,0,0,285,290,5,10,0,0,286,287,5,92,
+  	0,0,287,288,5,13,0,0,288,290,5,10,0,0,289,282,1,0,0,0,289,283,1,0,0,0,
+  	289,284,1,0,0,0,289,286,1,0,0,0,290,84,1,0,0,0,291,297,3,65,32,0,292,
+  	294,3,83,41,0,293,292,1,0,0,0,294,295,1,0,0,0,295,293,1,0,0,0,295,296,
+  	1,0,0,0,296,298,1,0,0,0,297,293,1,0,0,0,297,298,1,0,0,0,298,299,1,0,0,
+  	0,299,300,3,65,32,0,300,86,1,0,0,0,19,0,197,199,206,208,215,217,223,228,
+  	233,243,254,267,270,278,280,289,295,297,1,6,0,0
   };
   staticData->serializedATN = antlr4::atn::SerializedATNView(serializedATNSegment, sizeof(serializedATNSegment) / sizeof(serializedATNSegment[0]));
 
diff --git a/src/antlrgen/SysyParser.cpp b/src/antlrgen/SysyParser.cpp
index 42f6c86..ab8a178 100644
--- a/src/antlrgen/SysyParser.cpp
+++ b/src/antlrgen/SysyParser.cpp
@@ -52,23 +52,22 @@ void sysyParserInitialize() {
       "constExp"
     },
     std::vector<std::string>{
-      "", "", "", "", "", "", "", "", "", "'const'", "','", "';'", "'int'", 
-      "'['", "']'", "'='", "'{'", "'}'", "'('", "')'", "'void'", "'if'", 
-      "'else'", "'while'", "'break'", "'continue'", "'return'", "'+'", "'-'", 
-      "'!'", "'*'", "'/'", "'%'", "'<'", "'>'", "'<='", "'>='", "'=='", 
-      "'!='", "'&&'", "'||'"
+      "", "'const'", "','", "';'", "'int'", "'['", "']'", "'='", "'{'", 
+      "'}'", "'('", "')'", "'void'", "'if'", "'else'", "'while'", "'break'", 
+      "'continue'", "'return'", "'+'", "'-'", "'!'", "'*'", "'/'", "'%'", 
+      "'<'", "'>'", "'<='", "'>='", "'=='", "'!='", "'&&'", "'||'", "'\"'"
     },
     std::vector<std::string>{
-      "", "IDENT", "DECIMAL_CONST", "OCTAL_CONST", "HEXADECIMAL_CONST", 
-      "WS", "SINGLELINE_COMMENT", "MULTILINE_COMMENT", "StringLiteral", 
-      "CONST", "COMMA", "SEMICOLON", "INT", "LBRACKET", "RBRACKET", "ASSING", 
-      "LBRACE", "RBRACE", "LPAREN", "RPAREN", "VOID", "IF", "ELSE", "WHILE", 
-      "BREAK", "CONTINUE", "RETURN", "ADD", "SUB", "NOT", "MUL", "DIV", 
-      "MOD", "LT", "GT", "LE", "GE", "EQ", "NE", "AND", "OR"
+      "", "CONST", "COMMA", "SEMICOLON", "INT", "LBRACKET", "RBRACKET", 
+      "ASSIGN", "LBRACE", "RBRACE", "LPAREN", "RPAREN", "VOID", "IF", "ELSE", 
+      "WHILE", "BREAK", "CONTINUE", "RETURN", "ADD", "SUB", "NOT", "MUL", 
+      "DIV", "MOD", "LT", "GT", "LE", "GE", "EQ", "NE", "AND", "OR", "DQUOTE", 
+      "IDENT", "DECIMAL_CONST", "OCTAL_CONST", "HEXADECIMAL_CONST", "WS", 
+      "SINGLELINE_COMMENT", "MULTILINE_COMMENT", "StringLiteral"
     }
   );
   static const int32_t serializedATNSegment[] = {
-  	4,1,40,366,2,0,7,0,2,1,7,1,2,2,7,2,2,3,7,3,2,4,7,4,2,5,7,5,2,6,7,6,2,
+  	4,1,41,366,2,0,7,0,2,1,7,1,2,2,7,2,2,3,7,3,2,4,7,4,2,5,7,5,2,6,7,6,2,
   	7,7,7,2,8,7,8,2,9,7,9,2,10,7,10,2,11,7,11,2,12,7,12,2,13,7,13,2,14,7,
   	14,2,15,7,15,2,16,7,16,2,17,7,17,2,18,7,18,2,19,7,19,2,20,7,20,2,21,7,
   	21,2,22,7,22,2,23,7,23,2,24,7,24,2,25,7,25,2,26,7,26,2,27,7,27,2,28,7,
@@ -98,8 +97,8 @@ void sysyParserInitialize() {
   	9,31,1,32,1,32,1,32,1,32,1,32,1,32,5,32,359,8,32,10,32,12,32,362,9,32,
   	1,33,1,33,1,33,0,6,54,56,58,60,62,64,34,0,2,4,6,8,10,12,14,16,18,20,22,
   	24,26,28,30,32,34,36,38,40,42,44,46,48,50,52,54,56,58,60,62,64,66,0,7,
-  	2,0,12,12,20,20,1,0,2,4,1,0,27,29,1,0,30,32,1,0,27,28,1,0,33,36,1,0,37,
-  	38,375,0,68,1,0,0,0,2,72,1,0,0,0,4,78,1,0,0,0,6,80,1,0,0,0,8,92,1,0,0,
+  	2,0,4,4,12,12,1,0,35,37,1,0,19,21,1,0,22,24,1,0,19,20,1,0,25,28,1,0,29,
+  	30,375,0,68,1,0,0,0,2,72,1,0,0,0,4,78,1,0,0,0,6,80,1,0,0,0,8,92,1,0,0,
   	0,10,94,1,0,0,0,12,120,1,0,0,0,14,122,1,0,0,0,16,133,1,0,0,0,18,160,1,
   	0,0,0,20,162,1,0,0,0,22,171,1,0,0,0,24,173,1,0,0,0,26,181,1,0,0,0,28,
   	196,1,0,0,0,30,207,1,0,0,0,32,243,1,0,0,0,34,245,1,0,0,0,36,247,1,0,0,
@@ -109,85 +108,84 @@ void sysyParserInitialize() {
   	0,66,363,1,0,0,0,68,69,3,2,1,0,69,1,1,0,0,0,70,73,3,20,10,0,71,73,3,4,
   	2,0,72,70,1,0,0,0,72,71,1,0,0,0,73,74,1,0,0,0,74,72,1,0,0,0,74,75,1,0,
   	0,0,75,3,1,0,0,0,76,79,3,6,3,0,77,79,3,14,7,0,78,76,1,0,0,0,78,77,1,0,
-  	0,0,79,5,1,0,0,0,80,81,5,9,0,0,81,82,3,8,4,0,82,87,3,10,5,0,83,84,5,10,
+  	0,0,79,5,1,0,0,0,80,81,5,1,0,0,81,82,3,8,4,0,82,87,3,10,5,0,83,84,5,2,
   	0,0,84,86,3,10,5,0,85,83,1,0,0,0,86,89,1,0,0,0,87,85,1,0,0,0,87,88,1,
-  	0,0,0,88,90,1,0,0,0,89,87,1,0,0,0,90,91,5,11,0,0,91,7,1,0,0,0,92,93,5,
-  	12,0,0,93,9,1,0,0,0,94,101,5,1,0,0,95,96,5,13,0,0,96,97,3,66,33,0,97,
-  	98,5,14,0,0,98,100,1,0,0,0,99,95,1,0,0,0,100,103,1,0,0,0,101,99,1,0,0,
-  	0,101,102,1,0,0,0,102,104,1,0,0,0,103,101,1,0,0,0,104,105,5,15,0,0,105,
-  	106,3,12,6,0,106,11,1,0,0,0,107,121,3,66,33,0,108,117,5,16,0,0,109,114,
-  	3,12,6,0,110,111,5,10,0,0,111,113,3,12,6,0,112,110,1,0,0,0,113,116,1,
-  	0,0,0,114,112,1,0,0,0,114,115,1,0,0,0,115,118,1,0,0,0,116,114,1,0,0,0,
-  	117,109,1,0,0,0,117,118,1,0,0,0,118,119,1,0,0,0,119,121,5,17,0,0,120,
-  	107,1,0,0,0,120,108,1,0,0,0,121,13,1,0,0,0,122,123,3,8,4,0,123,128,3,
-  	16,8,0,124,125,5,10,0,0,125,127,3,16,8,0,126,124,1,0,0,0,127,130,1,0,
-  	0,0,128,126,1,0,0,0,128,129,1,0,0,0,129,131,1,0,0,0,130,128,1,0,0,0,131,
-  	132,5,11,0,0,132,15,1,0,0,0,133,140,5,1,0,0,134,135,5,13,0,0,135,136,
-  	3,66,33,0,136,137,5,14,0,0,137,139,1,0,0,0,138,134,1,0,0,0,139,142,1,
-  	0,0,0,140,138,1,0,0,0,140,141,1,0,0,0,141,145,1,0,0,0,142,140,1,0,0,0,
-  	143,144,5,15,0,0,144,146,3,18,9,0,145,143,1,0,0,0,145,146,1,0,0,0,146,
-  	17,1,0,0,0,147,161,3,34,17,0,148,157,5,16,0,0,149,154,3,18,9,0,150,151,
-  	5,10,0,0,151,153,3,18,9,0,152,150,1,0,0,0,153,156,1,0,0,0,154,152,1,0,
-  	0,0,154,155,1,0,0,0,155,158,1,0,0,0,156,154,1,0,0,0,157,149,1,0,0,0,157,
-  	158,1,0,0,0,158,159,1,0,0,0,159,161,5,17,0,0,160,147,1,0,0,0,160,148,
-  	1,0,0,0,161,19,1,0,0,0,162,163,3,22,11,0,163,164,5,1,0,0,164,166,5,18,
-  	0,0,165,167,3,24,12,0,166,165,1,0,0,0,166,167,1,0,0,0,167,168,1,0,0,0,
-  	168,169,5,19,0,0,169,170,3,28,14,0,170,21,1,0,0,0,171,172,7,0,0,0,172,
-  	23,1,0,0,0,173,178,3,26,13,0,174,175,5,10,0,0,175,177,3,26,13,0,176,174,
-  	1,0,0,0,177,180,1,0,0,0,178,176,1,0,0,0,178,179,1,0,0,0,179,25,1,0,0,
-  	0,180,178,1,0,0,0,181,182,3,8,4,0,182,194,5,1,0,0,183,184,5,13,0,0,184,
-  	191,5,14,0,0,185,186,5,13,0,0,186,187,3,34,17,0,187,188,5,14,0,0,188,
-  	190,1,0,0,0,189,185,1,0,0,0,190,193,1,0,0,0,191,189,1,0,0,0,191,192,1,
-  	0,0,0,192,195,1,0,0,0,193,191,1,0,0,0,194,183,1,0,0,0,194,195,1,0,0,0,
-  	195,27,1,0,0,0,196,200,5,16,0,0,197,199,3,30,15,0,198,197,1,0,0,0,199,
-  	202,1,0,0,0,200,198,1,0,0,0,200,201,1,0,0,0,201,203,1,0,0,0,202,200,1,
-  	0,0,0,203,204,5,17,0,0,204,29,1,0,0,0,205,208,3,4,2,0,206,208,3,32,16,
-  	0,207,205,1,0,0,0,207,206,1,0,0,0,208,31,1,0,0,0,209,210,3,38,19,0,210,
-  	211,5,15,0,0,211,212,3,34,17,0,212,213,5,11,0,0,213,244,1,0,0,0,214,216,
-  	3,34,17,0,215,214,1,0,0,0,215,216,1,0,0,0,216,217,1,0,0,0,217,244,5,11,
-  	0,0,218,244,3,28,14,0,219,220,5,21,0,0,220,221,5,18,0,0,221,222,3,36,
-  	18,0,222,223,5,19,0,0,223,226,3,32,16,0,224,225,5,22,0,0,225,227,3,32,
-  	16,0,226,224,1,0,0,0,226,227,1,0,0,0,227,244,1,0,0,0,228,229,5,23,0,0,
-  	229,230,5,18,0,0,230,231,3,36,18,0,231,232,5,19,0,0,232,233,3,32,16,0,
-  	233,244,1,0,0,0,234,235,5,24,0,0,235,244,5,11,0,0,236,237,5,25,0,0,237,
-  	244,5,11,0,0,238,240,5,26,0,0,239,241,3,34,17,0,240,239,1,0,0,0,240,241,
-  	1,0,0,0,241,242,1,0,0,0,242,244,5,11,0,0,243,209,1,0,0,0,243,215,1,0,
-  	0,0,243,218,1,0,0,0,243,219,1,0,0,0,243,228,1,0,0,0,243,234,1,0,0,0,243,
-  	236,1,0,0,0,243,238,1,0,0,0,244,33,1,0,0,0,245,246,3,56,28,0,246,35,1,
-  	0,0,0,247,248,3,64,32,0,248,37,1,0,0,0,249,256,5,1,0,0,250,251,5,13,0,
-  	0,251,252,3,34,17,0,252,253,5,14,0,0,253,255,1,0,0,0,254,250,1,0,0,0,
-  	255,258,1,0,0,0,256,254,1,0,0,0,256,257,1,0,0,0,257,39,1,0,0,0,258,256,
-  	1,0,0,0,259,260,5,18,0,0,260,261,3,34,17,0,261,262,5,19,0,0,262,266,1,
-  	0,0,0,263,266,3,38,19,0,264,266,3,42,21,0,265,259,1,0,0,0,265,263,1,0,
-  	0,0,265,264,1,0,0,0,266,41,1,0,0,0,267,268,3,44,22,0,268,43,1,0,0,0,269,
-  	270,7,1,0,0,270,45,1,0,0,0,271,282,3,40,20,0,272,273,5,1,0,0,273,275,
-  	5,18,0,0,274,276,3,50,25,0,275,274,1,0,0,0,275,276,1,0,0,0,276,277,1,
-  	0,0,0,277,282,5,19,0,0,278,279,3,48,24,0,279,280,3,46,23,0,280,282,1,
-  	0,0,0,281,271,1,0,0,0,281,272,1,0,0,0,281,278,1,0,0,0,282,47,1,0,0,0,
-  	283,284,7,2,0,0,284,49,1,0,0,0,285,290,3,52,26,0,286,287,5,10,0,0,287,
-  	289,3,52,26,0,288,286,1,0,0,0,289,292,1,0,0,0,290,288,1,0,0,0,290,291,
-  	1,0,0,0,291,51,1,0,0,0,292,290,1,0,0,0,293,296,3,34,17,0,294,296,5,8,
-  	0,0,295,293,1,0,0,0,295,294,1,0,0,0,296,53,1,0,0,0,297,298,6,27,-1,0,
-  	298,299,3,46,23,0,299,305,1,0,0,0,300,301,10,1,0,0,301,302,7,3,0,0,302,
-  	304,3,46,23,0,303,300,1,0,0,0,304,307,1,0,0,0,305,303,1,0,0,0,305,306,
-  	1,0,0,0,306,55,1,0,0,0,307,305,1,0,0,0,308,309,6,28,-1,0,309,310,3,54,
-  	27,0,310,316,1,0,0,0,311,312,10,1,0,0,312,313,7,4,0,0,313,315,3,54,27,
-  	0,314,311,1,0,0,0,315,318,1,0,0,0,316,314,1,0,0,0,316,317,1,0,0,0,317,
-  	57,1,0,0,0,318,316,1,0,0,0,319,320,6,29,-1,0,320,321,3,56,28,0,321,327,
-  	1,0,0,0,322,323,10,1,0,0,323,324,7,5,0,0,324,326,3,56,28,0,325,322,1,
-  	0,0,0,326,329,1,0,0,0,327,325,1,0,0,0,327,328,1,0,0,0,328,59,1,0,0,0,
-  	329,327,1,0,0,0,330,331,6,30,-1,0,331,332,3,58,29,0,332,338,1,0,0,0,333,
-  	334,10,1,0,0,334,335,7,6,0,0,335,337,3,58,29,0,336,333,1,0,0,0,337,340,
-  	1,0,0,0,338,336,1,0,0,0,338,339,1,0,0,0,339,61,1,0,0,0,340,338,1,0,0,
-  	0,341,342,6,31,-1,0,342,343,3,60,30,0,343,349,1,0,0,0,344,345,10,1,0,
-  	0,345,346,5,39,0,0,346,348,3,60,30,0,347,344,1,0,0,0,348,351,1,0,0,0,
-  	349,347,1,0,0,0,349,350,1,0,0,0,350,63,1,0,0,0,351,349,1,0,0,0,352,353,
-  	6,32,-1,0,353,354,3,62,31,0,354,360,1,0,0,0,355,356,10,1,0,0,356,357,
-  	5,40,0,0,357,359,3,62,31,0,358,355,1,0,0,0,359,362,1,0,0,0,360,358,1,
-  	0,0,0,360,361,1,0,0,0,361,65,1,0,0,0,362,360,1,0,0,0,363,364,3,56,28,
-  	0,364,67,1,0,0,0,36,72,74,78,87,101,114,117,120,128,140,145,154,157,160,
-  	166,178,191,194,200,207,215,226,240,243,256,265,275,281,290,295,305,316,
-  	327,338,349,360
+  	0,0,0,88,90,1,0,0,0,89,87,1,0,0,0,90,91,5,3,0,0,91,7,1,0,0,0,92,93,5,
+  	4,0,0,93,9,1,0,0,0,94,101,5,34,0,0,95,96,5,5,0,0,96,97,3,66,33,0,97,98,
+  	5,6,0,0,98,100,1,0,0,0,99,95,1,0,0,0,100,103,1,0,0,0,101,99,1,0,0,0,101,
+  	102,1,0,0,0,102,104,1,0,0,0,103,101,1,0,0,0,104,105,5,7,0,0,105,106,3,
+  	12,6,0,106,11,1,0,0,0,107,121,3,66,33,0,108,117,5,8,0,0,109,114,3,12,
+  	6,0,110,111,5,2,0,0,111,113,3,12,6,0,112,110,1,0,0,0,113,116,1,0,0,0,
+  	114,112,1,0,0,0,114,115,1,0,0,0,115,118,1,0,0,0,116,114,1,0,0,0,117,109,
+  	1,0,0,0,117,118,1,0,0,0,118,119,1,0,0,0,119,121,5,9,0,0,120,107,1,0,0,
+  	0,120,108,1,0,0,0,121,13,1,0,0,0,122,123,3,8,4,0,123,128,3,16,8,0,124,
+  	125,5,2,0,0,125,127,3,16,8,0,126,124,1,0,0,0,127,130,1,0,0,0,128,126,
+  	1,0,0,0,128,129,1,0,0,0,129,131,1,0,0,0,130,128,1,0,0,0,131,132,5,3,0,
+  	0,132,15,1,0,0,0,133,140,5,34,0,0,134,135,5,5,0,0,135,136,3,66,33,0,136,
+  	137,5,6,0,0,137,139,1,0,0,0,138,134,1,0,0,0,139,142,1,0,0,0,140,138,1,
+  	0,0,0,140,141,1,0,0,0,141,145,1,0,0,0,142,140,1,0,0,0,143,144,5,7,0,0,
+  	144,146,3,18,9,0,145,143,1,0,0,0,145,146,1,0,0,0,146,17,1,0,0,0,147,161,
+  	3,34,17,0,148,157,5,8,0,0,149,154,3,18,9,0,150,151,5,2,0,0,151,153,3,
+  	18,9,0,152,150,1,0,0,0,153,156,1,0,0,0,154,152,1,0,0,0,154,155,1,0,0,
+  	0,155,158,1,0,0,0,156,154,1,0,0,0,157,149,1,0,0,0,157,158,1,0,0,0,158,
+  	159,1,0,0,0,159,161,5,9,0,0,160,147,1,0,0,0,160,148,1,0,0,0,161,19,1,
+  	0,0,0,162,163,3,22,11,0,163,164,5,34,0,0,164,166,5,10,0,0,165,167,3,24,
+  	12,0,166,165,1,0,0,0,166,167,1,0,0,0,167,168,1,0,0,0,168,169,5,11,0,0,
+  	169,170,3,28,14,0,170,21,1,0,0,0,171,172,7,0,0,0,172,23,1,0,0,0,173,178,
+  	3,26,13,0,174,175,5,2,0,0,175,177,3,26,13,0,176,174,1,0,0,0,177,180,1,
+  	0,0,0,178,176,1,0,0,0,178,179,1,0,0,0,179,25,1,0,0,0,180,178,1,0,0,0,
+  	181,182,3,8,4,0,182,194,5,34,0,0,183,184,5,5,0,0,184,191,5,6,0,0,185,
+  	186,5,5,0,0,186,187,3,34,17,0,187,188,5,6,0,0,188,190,1,0,0,0,189,185,
+  	1,0,0,0,190,193,1,0,0,0,191,189,1,0,0,0,191,192,1,0,0,0,192,195,1,0,0,
+  	0,193,191,1,0,0,0,194,183,1,0,0,0,194,195,1,0,0,0,195,27,1,0,0,0,196,
+  	200,5,8,0,0,197,199,3,30,15,0,198,197,1,0,0,0,199,202,1,0,0,0,200,198,
+  	1,0,0,0,200,201,1,0,0,0,201,203,1,0,0,0,202,200,1,0,0,0,203,204,5,9,0,
+  	0,204,29,1,0,0,0,205,208,3,4,2,0,206,208,3,32,16,0,207,205,1,0,0,0,207,
+  	206,1,0,0,0,208,31,1,0,0,0,209,210,3,38,19,0,210,211,5,7,0,0,211,212,
+  	3,34,17,0,212,213,5,3,0,0,213,244,1,0,0,0,214,216,3,34,17,0,215,214,1,
+  	0,0,0,215,216,1,0,0,0,216,217,1,0,0,0,217,244,5,3,0,0,218,244,3,28,14,
+  	0,219,220,5,13,0,0,220,221,5,10,0,0,221,222,3,36,18,0,222,223,5,11,0,
+  	0,223,226,3,32,16,0,224,225,5,14,0,0,225,227,3,32,16,0,226,224,1,0,0,
+  	0,226,227,1,0,0,0,227,244,1,0,0,0,228,229,5,15,0,0,229,230,5,10,0,0,230,
+  	231,3,36,18,0,231,232,5,11,0,0,232,233,3,32,16,0,233,244,1,0,0,0,234,
+  	235,5,16,0,0,235,244,5,3,0,0,236,237,5,17,0,0,237,244,5,3,0,0,238,240,
+  	5,18,0,0,239,241,3,34,17,0,240,239,1,0,0,0,240,241,1,0,0,0,241,242,1,
+  	0,0,0,242,244,5,3,0,0,243,209,1,0,0,0,243,215,1,0,0,0,243,218,1,0,0,0,
+  	243,219,1,0,0,0,243,228,1,0,0,0,243,234,1,0,0,0,243,236,1,0,0,0,243,238,
+  	1,0,0,0,244,33,1,0,0,0,245,246,3,56,28,0,246,35,1,0,0,0,247,248,3,64,
+  	32,0,248,37,1,0,0,0,249,256,5,34,0,0,250,251,5,5,0,0,251,252,3,34,17,
+  	0,252,253,5,6,0,0,253,255,1,0,0,0,254,250,1,0,0,0,255,258,1,0,0,0,256,
+  	254,1,0,0,0,256,257,1,0,0,0,257,39,1,0,0,0,258,256,1,0,0,0,259,260,5,
+  	10,0,0,260,261,3,34,17,0,261,262,5,11,0,0,262,266,1,0,0,0,263,266,3,38,
+  	19,0,264,266,3,42,21,0,265,259,1,0,0,0,265,263,1,0,0,0,265,264,1,0,0,
+  	0,266,41,1,0,0,0,267,268,3,44,22,0,268,43,1,0,0,0,269,270,7,1,0,0,270,
+  	45,1,0,0,0,271,282,3,40,20,0,272,273,5,34,0,0,273,275,5,10,0,0,274,276,
+  	3,50,25,0,275,274,1,0,0,0,275,276,1,0,0,0,276,277,1,0,0,0,277,282,5,11,
+  	0,0,278,279,3,48,24,0,279,280,3,46,23,0,280,282,1,0,0,0,281,271,1,0,0,
+  	0,281,272,1,0,0,0,281,278,1,0,0,0,282,47,1,0,0,0,283,284,7,2,0,0,284,
+  	49,1,0,0,0,285,290,3,52,26,0,286,287,5,2,0,0,287,289,3,52,26,0,288,286,
+  	1,0,0,0,289,292,1,0,0,0,290,288,1,0,0,0,290,291,1,0,0,0,291,51,1,0,0,
+  	0,292,290,1,0,0,0,293,296,3,34,17,0,294,296,5,41,0,0,295,293,1,0,0,0,
+  	295,294,1,0,0,0,296,53,1,0,0,0,297,298,6,27,-1,0,298,299,3,46,23,0,299,
+  	305,1,0,0,0,300,301,10,1,0,0,301,302,7,3,0,0,302,304,3,46,23,0,303,300,
+  	1,0,0,0,304,307,1,0,0,0,305,303,1,0,0,0,305,306,1,0,0,0,306,55,1,0,0,
+  	0,307,305,1,0,0,0,308,309,6,28,-1,0,309,310,3,54,27,0,310,316,1,0,0,0,
+  	311,312,10,1,0,0,312,313,7,4,0,0,313,315,3,54,27,0,314,311,1,0,0,0,315,
+  	318,1,0,0,0,316,314,1,0,0,0,316,317,1,0,0,0,317,57,1,0,0,0,318,316,1,
+  	0,0,0,319,320,6,29,-1,0,320,321,3,56,28,0,321,327,1,0,0,0,322,323,10,
+  	1,0,0,323,324,7,5,0,0,324,326,3,56,28,0,325,322,1,0,0,0,326,329,1,0,0,
+  	0,327,325,1,0,0,0,327,328,1,0,0,0,328,59,1,0,0,0,329,327,1,0,0,0,330,
+  	331,6,30,-1,0,331,332,3,58,29,0,332,338,1,0,0,0,333,334,10,1,0,0,334,
+  	335,7,6,0,0,335,337,3,58,29,0,336,333,1,0,0,0,337,340,1,0,0,0,338,336,
+  	1,0,0,0,338,339,1,0,0,0,339,61,1,0,0,0,340,338,1,0,0,0,341,342,6,31,-1,
+  	0,342,343,3,60,30,0,343,349,1,0,0,0,344,345,10,1,0,0,345,346,5,31,0,0,
+  	346,348,3,60,30,0,347,344,1,0,0,0,348,351,1,0,0,0,349,347,1,0,0,0,349,
+  	350,1,0,0,0,350,63,1,0,0,0,351,349,1,0,0,0,352,353,6,32,-1,0,353,354,
+  	3,62,31,0,354,360,1,0,0,0,355,356,10,1,0,0,356,357,5,32,0,0,357,359,3,
+  	62,31,0,358,355,1,0,0,0,359,362,1,0,0,0,360,358,1,0,0,0,360,361,1,0,0,
+  	0,361,65,1,0,0,0,362,360,1,0,0,0,363,364,3,56,28,0,364,67,1,0,0,0,36,
+  	72,74,78,87,101,114,117,120,128,140,145,154,157,160,166,178,191,194,200,
+  	207,215,226,240,243,256,265,275,281,290,295,305,316,327,338,349,360
   };
   staticData->serializedATN = antlr4::atn::SerializedATNView(serializedATNSegment, sizeof(serializedATNSegment) / sizeof(serializedATNSegment[0]));
 
@@ -360,7 +358,7 @@ SysyParser::CompUnitContext* SysyParser::compUnit() {
       _errHandler->sync(this);
       _la = _input->LA(1);
     } while ((((_la & ~ 0x3fULL) == 0) &&
-      ((1ULL << _la) & 1053184) != 0));
+      ((1ULL << _la) & 4114) != 0));
    
   }
   catch (RecognitionException &e) {
@@ -593,8 +591,8 @@ tree::TerminalNode* SysyParser::ConstDefContext::IDENT() {
   return getToken(SysyParser::IDENT, 0);
 }
 
-tree::TerminalNode* SysyParser::ConstDefContext::ASSING() {
-  return getToken(SysyParser::ASSING, 0);
+tree::TerminalNode* SysyParser::ConstDefContext::ASSIGN() {
+  return getToken(SysyParser::ASSIGN, 0);
 }
 
 SysyParser::ConstInitValContext* SysyParser::ConstDefContext::constInitVal() {
@@ -669,7 +667,7 @@ SysyParser::ConstDefContext* SysyParser::constDef() {
       _la = _input->LA(1);
     }
     setState(104);
-    match(SysyParser::ASSING);
+    match(SysyParser::ASSIGN);
     setState(105);
     constInitVal();
    
@@ -746,14 +744,14 @@ SysyParser::ConstInitValContext* SysyParser::constInitVal() {
     setState(120);
     _errHandler->sync(this);
     switch (_input->LA(1)) {
-      case SysyParser::IDENT:
-      case SysyParser::DECIMAL_CONST:
-      case SysyParser::OCTAL_CONST:
-      case SysyParser::HEXADECIMAL_CONST:
       case SysyParser::LPAREN:
       case SysyParser::ADD:
       case SysyParser::SUB:
-      case SysyParser::NOT: {
+      case SysyParser::NOT:
+      case SysyParser::IDENT:
+      case SysyParser::DECIMAL_CONST:
+      case SysyParser::OCTAL_CONST:
+      case SysyParser::HEXADECIMAL_CONST: {
         enterOuterAlt(_localctx, 1);
         setState(107);
         constExp();
@@ -769,7 +767,7 @@ SysyParser::ConstInitValContext* SysyParser::constInitVal() {
 
         _la = _input->LA(1);
         if ((((_la & ~ 0x3fULL) == 0) &&
-          ((1ULL << _la) & 939851806) != 0)) {
+          ((1ULL << _la) & 257701709056) != 0)) {
           setState(109);
           constInitVal();
           setState(114);
@@ -924,8 +922,8 @@ tree::TerminalNode* SysyParser::VarDefContext::RBRACKET(size_t i) {
   return getToken(SysyParser::RBRACKET, i);
 }
 
-tree::TerminalNode* SysyParser::VarDefContext::ASSING() {
-  return getToken(SysyParser::ASSING, 0);
+tree::TerminalNode* SysyParser::VarDefContext::ASSIGN() {
+  return getToken(SysyParser::ASSIGN, 0);
 }
 
 SysyParser::InitValContext* SysyParser::VarDefContext::initVal() {
@@ -979,9 +977,9 @@ SysyParser::VarDefContext* SysyParser::varDef() {
     _errHandler->sync(this);
 
     _la = _input->LA(1);
-    if (_la == SysyParser::ASSING) {
+    if (_la == SysyParser::ASSIGN) {
       setState(143);
-      match(SysyParser::ASSING);
+      match(SysyParser::ASSIGN);
       setState(144);
       initVal();
     }
@@ -1059,14 +1057,14 @@ SysyParser::InitValContext* SysyParser::initVal() {
     setState(160);
     _errHandler->sync(this);
     switch (_input->LA(1)) {
-      case SysyParser::IDENT:
-      case SysyParser::DECIMAL_CONST:
-      case SysyParser::OCTAL_CONST:
-      case SysyParser::HEXADECIMAL_CONST:
       case SysyParser::LPAREN:
       case SysyParser::ADD:
       case SysyParser::SUB:
-      case SysyParser::NOT: {
+      case SysyParser::NOT:
+      case SysyParser::IDENT:
+      case SysyParser::DECIMAL_CONST:
+      case SysyParser::OCTAL_CONST:
+      case SysyParser::HEXADECIMAL_CONST: {
         enterOuterAlt(_localctx, 1);
         setState(147);
         exp();
@@ -1082,7 +1080,7 @@ SysyParser::InitValContext* SysyParser::initVal() {
 
         _la = _input->LA(1);
         if ((((_la & ~ 0x3fULL) == 0) &&
-          ((1ULL << _la) & 939851806) != 0)) {
+          ((1ULL << _la) & 257701709056) != 0)) {
           setState(149);
           initVal();
           setState(154);
@@ -1499,7 +1497,7 @@ SysyParser::BlockContext* SysyParser::block() {
     _errHandler->sync(this);
     _la = _input->LA(1);
     while ((((_la & ~ 0x3fULL) == 0) &&
-      ((1ULL << _la) & 1067784734) != 0)) {
+      ((1ULL << _la) & 257702208794) != 0)) {
       setState(197);
       blockItem();
       setState(202);
@@ -1569,10 +1567,6 @@ SysyParser::BlockItemContext* SysyParser::blockItem() {
         break;
       }
 
-      case SysyParser::IDENT:
-      case SysyParser::DECIMAL_CONST:
-      case SysyParser::OCTAL_CONST:
-      case SysyParser::HEXADECIMAL_CONST:
       case SysyParser::SEMICOLON:
       case SysyParser::LBRACE:
       case SysyParser::LPAREN:
@@ -1583,7 +1577,11 @@ SysyParser::BlockItemContext* SysyParser::blockItem() {
       case SysyParser::RETURN:
       case SysyParser::ADD:
       case SysyParser::SUB:
-      case SysyParser::NOT: {
+      case SysyParser::NOT:
+      case SysyParser::IDENT:
+      case SysyParser::DECIMAL_CONST:
+      case SysyParser::OCTAL_CONST:
+      case SysyParser::HEXADECIMAL_CONST: {
         enterOuterAlt(_localctx, 2);
         setState(206);
         stmt();
@@ -1710,8 +1708,8 @@ SysyParser::LValContext* SysyParser::AssignStmtContext::lVal() {
   return getRuleContext<SysyParser::LValContext>(0);
 }
 
-tree::TerminalNode* SysyParser::AssignStmtContext::ASSING() {
-  return getToken(SysyParser::ASSING, 0);
+tree::TerminalNode* SysyParser::AssignStmtContext::ASSIGN() {
+  return getToken(SysyParser::ASSIGN, 0);
 }
 
 SysyParser::ExpContext* SysyParser::AssignStmtContext::exp() {
@@ -1833,7 +1831,7 @@ SysyParser::StmtContext* SysyParser::stmt() {
       setState(209);
       lVal();
       setState(210);
-      match(SysyParser::ASSING);
+      match(SysyParser::ASSIGN);
       setState(211);
       exp();
       setState(212);
@@ -1849,7 +1847,7 @@ SysyParser::StmtContext* SysyParser::stmt() {
 
       _la = _input->LA(1);
       if ((((_la & ~ 0x3fULL) == 0) &&
-        ((1ULL << _la) & 939786270) != 0)) {
+        ((1ULL << _la) & 257701708800) != 0)) {
         setState(214);
         exp();
       }
@@ -1943,7 +1941,7 @@ SysyParser::StmtContext* SysyParser::stmt() {
 
       _la = _input->LA(1);
       if ((((_la & ~ 0x3fULL) == 0) &&
-        ((1ULL << _la) & 939786270) != 0)) {
+        ((1ULL << _la) & 257701708800) != 0)) {
         setState(239);
         exp();
       }
@@ -2346,7 +2344,7 @@ SysyParser::IntConstContext* SysyParser::intConst() {
     setState(269);
     _la = _input->LA(1);
     if (!((((_la & ~ 0x3fULL) == 0) &&
-      ((1ULL << _la) & 28) != 0))) {
+      ((1ULL << _la) & 240518168576) != 0))) {
     _errHandler->recoverInline(this);
     }
     else {
@@ -2445,7 +2443,7 @@ SysyParser::UnaryExpContext* SysyParser::unaryExp() {
 
       _la = _input->LA(1);
       if ((((_la & ~ 0x3fULL) == 0) &&
-        ((1ULL << _la) & 939786526) != 0)) {
+        ((1ULL << _la) & 2456724964352) != 0)) {
         setState(274);
         funcRParams();
       }
@@ -2525,7 +2523,7 @@ SysyParser::UnaryOpContext* SysyParser::unaryOp() {
     setState(283);
     _la = _input->LA(1);
     if (!((((_la & ~ 0x3fULL) == 0) &&
-      ((1ULL << _la) & 939524096) != 0))) {
+      ((1ULL << _la) & 3670016) != 0))) {
     _errHandler->recoverInline(this);
     }
     else {
@@ -2659,14 +2657,14 @@ SysyParser::FuncRParamContext* SysyParser::funcRParam() {
     setState(295);
     _errHandler->sync(this);
     switch (_input->LA(1)) {
-      case SysyParser::IDENT:
-      case SysyParser::DECIMAL_CONST:
-      case SysyParser::OCTAL_CONST:
-      case SysyParser::HEXADECIMAL_CONST:
       case SysyParser::LPAREN:
       case SysyParser::ADD:
       case SysyParser::SUB:
-      case SysyParser::NOT: {
+      case SysyParser::NOT:
+      case SysyParser::IDENT:
+      case SysyParser::DECIMAL_CONST:
+      case SysyParser::OCTAL_CONST:
+      case SysyParser::HEXADECIMAL_CONST: {
         enterOuterAlt(_localctx, 1);
         setState(293);
         exp();
@@ -2778,7 +2776,7 @@ SysyParser::MulExpContext* SysyParser::mulExp(int precedence) {
         setState(301);
         _la = _input->LA(1);
         if (!((((_la & ~ 0x3fULL) == 0) &&
-          ((1ULL << _la) & 7516192768) != 0))) {
+          ((1ULL << _la) & 29360128) != 0))) {
         _errHandler->recoverInline(this);
         }
         else {
@@ -2993,7 +2991,7 @@ SysyParser::RelExpContext* SysyParser::relExp(int precedence) {
         setState(323);
         _la = _input->LA(1);
         if (!((((_la & ~ 0x3fULL) == 0) &&
-          ((1ULL << _la) & 128849018880) != 0))) {
+          ((1ULL << _la) & 503316480) != 0))) {
         _errHandler->recoverInline(this);
         }
         else {
diff --git a/src/main.cpp b/src/main.cpp
index 7bd2088..1c86d15 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,11 +1,16 @@
-#include <iostream>
 #include <fstream>
+#include <iostream>
 #include <string>
 
-#include "SysyLexer.h"
-#include "SysyParser.h"
 #include "antlr4-runtime.h"
-#include <argparse.hpp>
+#include "antlrgen/SysyLexer.h"
+#include "antlrgen/SysyParser.h"
+#include <3rdparty/argparse.hpp>
+
+#include "common.h"
+#include "visitor.h"
+
+INITIALIZE_EASYLOGGINGPP
 
 using namespace antlrSysY;
 using namespace antlr4;
@@ -31,23 +36,25 @@ int main(int argc, const char **argv) {
   auto source_file = arg_parser.get<std::string>("source");
   auto output_file = arg_parser.get<std::string>("-o");
   auto flg_O1 = arg_parser["-O1"] == true;
-  // std::cout << source_file << " " << output_file << " " << flg_O1 << std::endl;
+  // std::cout << source_file << " " << output_file << " " << flg_O1 <<
+  // std::endl;
 #pragma endregion
 
   std::ifstream ifs_source_file(source_file);
   ANTLRInputStream input(ifs_source_file);
   SysyLexer lexer(&input);
   CommonTokenStream tokens(&lexer);
-
-  tokens.fill();
 #if 0
+  tokens.fill();
   for (auto token : tokens.getTokens()) {
     std::cout << token->toString() << std::endl;
   }
 #endif
 
   SysyParser parser(&tokens);
-  tree::ParseTree *tree = parser.program();
+  auto tree = parser.program();
+  Visitor visitor(lexer);
+  visitor.visitProgram(tree);
 #if 0
   std::cout << tree->toStringTree(&parser) << std::endl << std::endl;
 #endif
diff --git a/src/visitor.cpp b/src/visitor.cpp
new file mode 100644
index 0000000..0812e5c
--- /dev/null
+++ b/src/visitor.cpp
@@ -0,0 +1,173 @@
+#include "visitor.h"
+#include "common.h"
+#include "llir_value.h"
+#include <any>
+#include <memory>
+
+namespace antlrSysY {
+
+std::any Visitor::visitConstDecl(SysyParser::ConstDeclContext *ctx) {
+  for (auto constDef : ctx->constDef()) {
+    visitConstDef(constDef);
+  }
+  return {};
+}
+
+// constDef : IDENT ('[' constExp ']')* '=' constInitVal ';'
+std::any Visitor::visitConstDef(SysyParser::ConstDefContext *ctx) {
+  auto name = ctx->IDENT()->getText();
+  LOG(DEBUG) << "Visiting ConstDef " << name;
+  if (_scope_tab.get_name(name, _scope_tab.get_level()).has_value())
+    throw GrammarException("Duplicate const def");
+  if (ctx->constExp().empty()) {
+    // not array define
+    if (ctx->constInitVal() != nullptr) {
+      auto result = std::any_cast<std::shared_ptr<ConstantInt>>(visit(ctx->constInitVal()));
+      // _scope_tab.push_name(name, Value *const &&value)
+      _scope_tab.push_name(name, result);
+    }
+  }
+  return {};
+}
+
+std::any Visitor::visitConstInitVal(SysyParser::ConstInitValContext *ctx) {
+  if (ctx->constExp() != nullptr /*&& ctx->arrDim.size() == 0*/) {
+    return visit(ctx->constExp());
+  }
+  return {};
+}
+
+std::any Visitor::visitConstExp(SysyParser::ConstExpContext *ctx) {
+  if (ctx->addExp() == nullptr)
+    panic("missing element");
+  _state.isConstInt = true;
+  int result = std::any_cast<int>(visit(ctx->addExp()));
+  _state.isConstInt = false;
+  LOG(DEBUG) << "ConstExp Eval to " << result;
+  auto constint = std::make_shared<ConstantInt>("", result, 1);
+  return {constint};
+}
+
+// addExp: mulExp | addExp ('+' | '-') mulExp;
+std::any Visitor::visitAddExp(SysyParser::AddExpContext *ctx) {
+  if (_state.isConstInt) {
+    if (ctx->mulExp() == nullptr)
+      panic("missing element");
+    int result = std::any_cast<int>(visit(ctx->mulExp()));
+    int add_result = 0;
+    if (ctx->addExp()) {
+      add_result = std::any_cast<int>(visit(ctx->addExp()));
+      if (ctx->ADD())
+        result = add_result + result;
+      else if (ctx->SUB())
+        result = add_result - result;
+      else
+        panic("missing operator");
+    }
+    return {result};
+  } else {
+    panic("To be implemented");
+  }
+  return {};
+}
+
+std::any Visitor::visitMulExp(SysyParser::MulExpContext *ctx) {
+  if (_state.isConstInt) {
+    if (ctx->unaryExp() == nullptr)
+      panic("missing element");
+    int result = std::any_cast<int>(visit(ctx->unaryExp()));
+    if (ctx->mulExp()) {
+      int mul_result = std::any_cast<int>(visit(ctx->mulExp()));
+      if (ctx->MUL()) {
+        result = mul_result * result;
+      } else if (ctx->DIV()) {
+        result = mul_result / result;
+      } else if (ctx->MOD()) {
+        result = mul_result % result;
+      } else
+        panic("missing operator");
+    }
+    return {result};
+  } else {
+    panic("To be implemented");
+  }
+  return {};
+}
+// unaryExp: primaryExp | IDENT '(' (funcRParams)? ')' | unaryOp unaryExp;
+std::any Visitor::visitUnaryExp(SysyParser::UnaryExpContext *ctx) {
+  if (_state.isConstInt) {
+    if (ctx->unaryExp()) {
+      int result = std::any_cast<int>(visit(ctx->unaryExp()));
+      if (ctx->unaryOp()->ADD())
+        result = +result;
+      else if (ctx->unaryOp()->SUB())
+        result = -result;
+      else if (ctx->unaryOp()->NOT())
+        result = !result;
+      else
+        panic("Missing operator");
+      return {result};
+    } else if (ctx->primaryExp()) {
+      return visitPrimaryExp(ctx->primaryExp());
+    } else if (ctx->IDENT()) {
+      panic("Unexpected func call in const expr");
+    }
+    panic("missing element");
+  } else {
+    panic("To be implemented");
+  }
+  return {};
+}
+
+// primaryExp: ('(' exp ')') | lVal | number;
+std::any Visitor::visitPrimaryExp(SysyParser::PrimaryExpContext *ctx) {
+  if (_state.isConstInt) {
+    if (ctx->exp()) {
+      return visitExp(ctx->exp());
+    } else if (ctx->lVal()) {
+      auto value = std::any_cast<std::shared_ptr<Value>>(visit(ctx->lVal()));
+      auto constint = std::dynamic_pointer_cast<ConstantInt>(value); 
+      return constint->value;
+    } else if (ctx->number()) {
+      return visitNumber(ctx->number());
+    }
+    panic("missing element");
+  } else {
+    panic("To be implemented");
+  }
+  return {};
+}
+
+std::any Visitor::visitNumber(SysyParser::NumberContext *ctx) {
+  sysy_assert(ctx->intConst());
+  if (_state.isConstInt) {
+    return visit(ctx->intConst());
+  }
+  panic("To be implemented");
+}
+
+std::any Visitor::visitIntConst(SysyParser::IntConstContext *ctx) {
+  if (ctx->DECIMAL_CONST()) {
+    return std::stoi(ctx->DECIMAL_CONST()->getText(), nullptr, 10);
+  } else if (ctx->HEXADECIMAL_CONST()) {
+    return std::stoi(ctx->HEXADECIMAL_CONST()->getText(), nullptr, 16);
+
+  } else if (ctx->OCTAL_CONST()) {
+    return std::stoi(ctx->OCTAL_CONST()->getText(), nullptr, 8);
+  }
+  panic("missing element");
+}
+
+std::any Visitor::visitLVal(SysyParser::LValContext *ctx) {
+  auto name = ctx->IDENT()->getText();
+  LOG(DEBUG) << "Eval to lVal " << name;
+  auto _lval = _scope_tab.get_name(name);
+  sysy_assert(_lval.has_value());
+  auto lval = _lval.value();
+  if (lval->type == Type::IntegerType) {
+    return {lval};
+  }
+  panic("To be implemented");
+}
+
+} // namespace antlrSysY
\ No newline at end of file