[NFC][Kaleidoscope] Modify a char type typo

[achieveartificialintelligence]

Summary

I'm a bit unsure, is this intentional or a typo?

[dblaikie]

Yeah, the code is correct as-is, changing it to char would be incorrect.

getchar returns int ( https://linux.die.net/man/3/getchar ) and needs to so it can return EOF, which isn't a char value (otherwise there'd be no way to distinguish between that char value correctly being read from the file, and the case where it indicates the end of the file)

[achieveartificialintelligence]

In D99017#2642740, @dblaikie wrote:

Yeah, the code is correct as-is, changing it to char would be incorrect.

getchar returns int ( https://linux.die.net/man/3/getchar ) and needs to so it can return EOF, which isn't a char value (otherwise there'd be no way to distinguish between that char value correctly being read from the file, and the case where it indicates the end of the file)

Thank you for your advice!

llvm/examples/Kaleidoscope/BuildingAJIT/Chapter1/toy.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/BuildingAJIT/Chapter2/toy.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/BuildingAJIT/Chapter4/toy.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/Chapter2/toy.cpp

enum Token {
   tok_number = -5
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/Chapter3/toy.cpp

enum Token {
   tok_number = -5
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/Chapter4/toy.cpp

enum Token {
   tok_number = -5
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/Chapter6/toy.cpp

enum Token {
   tok_unary = -12
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/Chapter7/toy.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/Chapter8/toy.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr; // Filled in if tok_identifier
 static double NumVal;             // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))

llvm/examples/Kaleidoscope/MCJIT/cached/toy-jit.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr;  // Filled in if tok_identifier
 static double NumVal;              // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))
static int GetTokPrecedence() {
   // Make sure it's a declared binop.
   int TokPrec = BinopPrecedence[CurTok];
   if (TokPrec <= 0) return -1;
   return TokPrec;
 }
 
 /// Error* - These are little helper functions for error handling.
 ExprAST *Error(const char *Str) { fprintf(stderr, "Error: %s\n", Str);return 0;}
 PrototypeAST *ErrorP(const char *Str) { Error(Str); return 0; }
 FunctionAST *ErrorF(const char *Str) { Error(Str); return 0; }
 
 static ExprAST *ParseExpression();
 
 /// identifierexpr
 ///   ::= identifier
 ///   ::= identifier '(' expression* ')'
 static ExprAST *ParseIdentifierExpr() {
   std::string IdName = IdentifierStr;
if (CurTok != ')') {
     while (1) {
       ExprAST *Arg = ParseExpression();
       if (!Arg) return 0;
       Args.push_back(Arg);
 
       if (CurTok == ')') break;
 
       if (CurTok != ',')
         return Error("Expected ')' or ',' in argument list");
       getNextToken();
     }
   }
 
   // Eat the ')'.
   getNextToken();
   
   return new CallExprAST(IdName, Args);
 }
 
 /// numberexpr ::= number
 static ExprAST *ParseNumberExpr() {
   ExprAST *Result = new NumberExprAST(NumVal);
   getNextToken(); // consume the number
   return Result;
 }
 
 /// parenexpr ::= '(' expression ')'
 static ExprAST *ParseParenExpr() {
   getNextToken();  // eat (.
   ExprAST *V = ParseExpression();
   if (!V) return 0;
   
   if (CurTok != ')')
     return Error("expected ')'");
   getNextToken();  // eat ).
   return V;
 }
 
 /// ifexpr ::= 'if' expression 'then' expression 'else' expression
 static ExprAST *ParseIfExpr() {
   getNextToken();  // eat the if.
   
   // condition.
   ExprAST *Cond = ParseExpression();
   if (!Cond) return 0;
   
   if (CurTok != tok_then)
     return Error("expected then");
   getNextToken();  // eat the then
   
   ExprAST *Then = ParseExpression();
   if (Then == 0) return 0;
   
   if (CurTok != tok_else)
     return Error("expected else");
   
   getNextToken();
   
   ExprAST *Else = ParseExpression();
   if (!Else) return 0;
   
   return new IfExprAST(Cond, Then, Else);
 }
 
 /// forexpr ::= 'for' identifier '=' expr ',' expr (',' expr)? 'in' expression
 static ExprAST *ParseForExpr() {
   getNextToken();  // eat the for.
 
   if (CurTok != tok_identifier)
     return Error("expected identifier after for");
   
   std::string IdName = IdentifierStr;
   getNextToken();  // eat identifier.
   
   if (CurTok != '=')
     return Error("expected '=' after for");
   getNextToken();  // eat '='.
   
   
   ExprAST *Start = ParseExpression();
   if (Start == 0) return 0;
   if (CurTok != ',')
     return Error("expected ',' after for start value");
   getNextToken();
   
   ExprAST *End = ParseExpression();
   if (End == 0) return 0;
   
   // The step value is optional.
   ExprAST *Step = 0;
   if (CurTok == ',') {
     getNextToken();
     Step = ParseExpression();
     if (Step == 0) return 0;
   }
   
   if (CurTok != tok_in)
     return Error("expected 'in' after for");
   getNextToken();  // eat 'in'.
   
   ExprAST *Body = ParseExpression();
   if (Body == 0) return 0;
 
   return new ForExprAST(IdName, Start, End, Step, Body);
 }
 
 /// varexpr ::= 'var' identifier ('=' expression)? 
 //                    (',' identifier ('=' expression)?)* 'in' expression
 static ExprAST *ParseVarExpr() {
   getNextToken();  // eat the var.
 
   std::vector<std::pair<std::string, ExprAST*> > VarNames;
 
   // At least one variable name is required.
   if (CurTok != tok_identifier)
     return Error("expected identifier after var");
   
   while (1) {
     std::string Name = IdentifierStr;
     getNextToken();  // eat identifier.
 
     // Read the optional initializer.
     ExprAST *Init = 0;
     if (CurTok == '=') {

llvm/examples/Kaleidoscope/MCJIT/complete/toy.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr;  // Filled in if tok_identifier
 static double NumVal;              // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))
static int GetTokPrecedence() {
   // Make sure it's a declared binop.
   int TokPrec = BinopPrecedence[CurTok];
   if (TokPrec <= 0) return -1;
   return TokPrec;
 }
 
 /// Error* - These are little helper functions for error handling.
 ExprAST *Error(const char *Str) { fprintf(stderr, "Error: %s\n", Str);return 0;}
 PrototypeAST *ErrorP(const char *Str) { Error(Str); return 0; }
 FunctionAST *ErrorF(const char *Str) { Error(Str); return 0; }
 
 static ExprAST *ParseExpression();
 
 /// identifierexpr
 ///   ::= identifier
 ///   ::= identifier '(' expression* ')'
 static ExprAST *ParseIdentifierExpr() {
   std::string IdName = IdentifierStr;
if (CurTok != ')') {
     while (1) {
       ExprAST *Arg = ParseExpression();
       if (!Arg) return 0;
       Args.push_back(Arg);
 
       if (CurTok == ')') break;
 
       if (CurTok != ',')
         return Error("Expected ')' or ',' in argument list");
       getNextToken();
     }
   }
 
   // Eat the ')'.
   getNextToken();
 
   return new CallExprAST(IdName, Args);
 }
 
 /// numberexpr ::= number
 static ExprAST *ParseNumberExpr() {
   ExprAST *Result = new NumberExprAST(NumVal);
   getNextToken(); // consume the number
   return Result;
 }
 
 /// parenexpr ::= '(' expression ')'
 static ExprAST *ParseParenExpr() {
   getNextToken();  // eat (.
   ExprAST *V = ParseExpression();
   if (!V) return 0;
 
   if (CurTok != ')')
     return Error("expected ')'");
   getNextToken();  // eat ).
   return V;
 }
 
 /// ifexpr ::= 'if' expression 'then' expression 'else' expression
 static ExprAST *ParseIfExpr() {
   getNextToken();  // eat the if.
 
   // condition.
   ExprAST *Cond = ParseExpression();
   if (!Cond) return 0;
 
   if (CurTok != tok_then)
     return Error("expected then");
   getNextToken();  // eat the then
 
   ExprAST *Then = ParseExpression();
   if (Then == 0) return 0;
 
   if (CurTok != tok_else)
     return Error("expected else");
 
   getNextToken();
 
   ExprAST *Else = ParseExpression();
   if (!Else) return 0;
 
   return new IfExprAST(Cond, Then, Else);
 }
 
 /// forexpr ::= 'for' identifier '=' expr ',' expr (',' expr)? 'in' expression
 static ExprAST *ParseForExpr() {
   getNextToken();  // eat the for.
 
   if (CurTok != tok_identifier)
     return Error("expected identifier after for");
 
   std::string IdName = IdentifierStr;
   getNextToken();  // eat identifier.
 
   if (CurTok != '=')
     return Error("expected '=' after for");
   getNextToken();  // eat '='.
 
 
   ExprAST *Start = ParseExpression();
   if (Start == 0) return 0;
   if (CurTok != ',')
     return Error("expected ',' after for start value");
   getNextToken();
 
   ExprAST *End = ParseExpression();
   if (End == 0) return 0;
 
   // The step value is optional.
   ExprAST *Step = 0;
   if (CurTok == ',') {
     getNextToken();
     Step = ParseExpression();
     if (Step == 0) return 0;
   }
 
   if (CurTok != tok_in)
     return Error("expected 'in' after for");
   getNextToken();  // eat 'in'.
 
   ExprAST *Body = ParseExpression();
   if (Body == 0) return 0;
 
   return new ForExprAST(IdName, Start, End, Step, Body);
 }
 
 /// varexpr ::= 'var' identifier ('=' expression)?
 //                    (',' identifier ('=' expression)?)* 'in' expression
 static ExprAST *ParseVarExpr() {
   getNextToken();  // eat the var.
 
   std::vector<std::pair<std::string, ExprAST*> > VarNames;
 
   // At least one variable name is required.
   if (CurTok != tok_identifier)
     return Error("expected identifier after var");
 
   while (1) {
     std::string Name = IdentifierStr;
     getNextToken();  // eat identifier.
 
     // Read the optional initializer.
     ExprAST *Init = 0;
     if (CurTok == '=') {

llvm/examples/Kaleidoscope/MCJIT/initial/toy.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr;  // Filled in if tok_identifier
 static double NumVal;              // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))
static int GetTokPrecedence() {
   // Make sure it's a declared binop.
   int TokPrec = BinopPrecedence[CurTok];
   if (TokPrec <= 0) return -1;
   return TokPrec;
 }
 
 /// Error* - These are little helper functions for error handling.
 ExprAST *Error(const char *Str) { fprintf(stderr, "Error: %s\n", Str);return 0;}
 PrototypeAST *ErrorP(const char *Str) { Error(Str); return 0; }
 FunctionAST *ErrorF(const char *Str) { Error(Str); return 0; }
 
 static ExprAST *ParseExpression();
 
 /// identifierexpr
 ///   ::= identifier
 ///   ::= identifier '(' expression* ')'
 static ExprAST *ParseIdentifierExpr() {
   std::string IdName = IdentifierStr;
if (CurTok != ')') {
     while (1) {
       ExprAST *Arg = ParseExpression();
       if (!Arg) return 0;
       Args.push_back(Arg);
 
       if (CurTok == ')') break;
 
       if (CurTok != ',')
         return Error("Expected ')' or ',' in argument list");
       getNextToken();
     }
   }
 
   // Eat the ')'.
   getNextToken();
 
   return new CallExprAST(IdName, Args);
 }
 
 /// numberexpr ::= number
 static ExprAST *ParseNumberExpr() {
   ExprAST *Result = new NumberExprAST(NumVal);
   getNextToken(); // consume the number
   return Result;
 }
 
 /// parenexpr ::= '(' expression ')'
 static ExprAST *ParseParenExpr() {
   getNextToken();  // eat (.
   ExprAST *V = ParseExpression();
   if (!V) return 0;
 
   if (CurTok != ')')
     return Error("expected ')'");
   getNextToken();  // eat ).
   return V;
 }
 
 /// ifexpr ::= 'if' expression 'then' expression 'else' expression
 static ExprAST *ParseIfExpr() {
   getNextToken();  // eat the if.
 
   // condition.
   ExprAST *Cond = ParseExpression();
   if (!Cond) return 0;
 
   if (CurTok != tok_then)
     return Error("expected then");
   getNextToken();  // eat the then
 
   ExprAST *Then = ParseExpression();
   if (Then == 0) return 0;
 
   if (CurTok != tok_else)
     return Error("expected else");
 
   getNextToken();
 
   ExprAST *Else = ParseExpression();
   if (!Else) return 0;
 
   return new IfExprAST(Cond, Then, Else);
 }
 
 /// forexpr ::= 'for' identifier '=' expr ',' expr (',' expr)? 'in' expression
 static ExprAST *ParseForExpr() {
   getNextToken();  // eat the for.
 
   if (CurTok != tok_identifier)
     return Error("expected identifier after for");
 
   std::string IdName = IdentifierStr;
   getNextToken();  // eat identifier.
 
   if (CurTok != '=')
     return Error("expected '=' after for");
   getNextToken();  // eat '='.
 
 
   ExprAST *Start = ParseExpression();
   if (Start == 0) return 0;
   if (CurTok != ',')
     return Error("expected ',' after for start value");
   getNextToken();
 
   ExprAST *End = ParseExpression();
   if (End == 0) return 0;
 
   // The step value is optional.
   ExprAST *Step = 0;
   if (CurTok == ',') {
     getNextToken();
     Step = ParseExpression();
     if (Step == 0) return 0;
   }
 
   if (CurTok != tok_in)
     return Error("expected 'in' after for");
   getNextToken();  // eat 'in'.
 
   ExprAST *Body = ParseExpression();
   if (Body == 0) return 0;
 
   return new ForExprAST(IdName, Start, End, Step, Body);
 }
 
 /// varexpr ::= 'var' identifier ('=' expression)?
 //                    (',' identifier ('=' expression)?)* 'in' expression
 static ExprAST *ParseVarExpr() {
   getNextToken();  // eat the var.
 
   std::vector<std::pair<std::string, ExprAST*> > VarNames;
 
   // At least one variable name is required.
   if (CurTok != tok_identifier)
     return Error("expected identifier after var");
 
   while (1) {
     std::string Name = IdentifierStr;
     getNextToken();  // eat identifier.
 
     // Read the optional initializer.
     ExprAST *Init = 0;
     if (CurTok == '=') {

llvm/examples/Kaleidoscope/MCJIT/lazy/toy-jit.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr;  // Filled in if tok_identifier
 static double NumVal;              // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))
static int GetTokPrecedence() {
   // Make sure it's a declared binop.
   int TokPrec = BinopPrecedence[CurTok];
   if (TokPrec <= 0) return -1;
   return TokPrec;
 }
 
 /// Error* - These are little helper functions for error handling.
 ExprAST *Error(const char *Str) { fprintf(stderr, "Error: %s\n", Str);return 0;}
 PrototypeAST *ErrorP(const char *Str) { Error(Str); return 0; }
 FunctionAST *ErrorF(const char *Str) { Error(Str); return 0; }
 
 static ExprAST *ParseExpression();
 
 /// identifierexpr
 ///   ::= identifier
 ///   ::= identifier '(' expression* ')'
 static ExprAST *ParseIdentifierExpr() {
   std::string IdName = IdentifierStr;
if (CurTok != ')') {
     while (1) {
       ExprAST *Arg = ParseExpression();
       if (!Arg) return 0;
       Args.push_back(Arg);
 
       if (CurTok == ')') break;
 
       if (CurTok != ',')
         return Error("Expected ')' or ',' in argument list");
       getNextToken();
     }
   }
 
   // Eat the ')'.
   getNextToken();
   
   return new CallExprAST(IdName, Args);
 }
 
 /// numberexpr ::= number
 static ExprAST *ParseNumberExpr() {
   ExprAST *Result = new NumberExprAST(NumVal);
   getNextToken(); // consume the number
   return Result;
 }
 
 /// parenexpr ::= '(' expression ')'
 static ExprAST *ParseParenExpr() {
   getNextToken();  // eat (.
   ExprAST *V = ParseExpression();
   if (!V) return 0;
   
   if (CurTok != ')')
     return Error("expected ')'");
   getNextToken();  // eat ).
   return V;
 }
 
 /// ifexpr ::= 'if' expression 'then' expression 'else' expression
 static ExprAST *ParseIfExpr() {
   getNextToken();  // eat the if.
   
   // condition.
   ExprAST *Cond = ParseExpression();
   if (!Cond) return 0;
   
   if (CurTok != tok_then)
     return Error("expected then");
   getNextToken();  // eat the then
   
   ExprAST *Then = ParseExpression();
   if (Then == 0) return 0;
   
   if (CurTok != tok_else)
     return Error("expected else");
   
   getNextToken();
   
   ExprAST *Else = ParseExpression();
   if (!Else) return 0;
   
   return new IfExprAST(Cond, Then, Else);
 }
 
 /// forexpr ::= 'for' identifier '=' expr ',' expr (',' expr)? 'in' expression
 static ExprAST *ParseForExpr() {
   getNextToken();  // eat the for.
 
   if (CurTok != tok_identifier)
     return Error("expected identifier after for");
   
   std::string IdName = IdentifierStr;
   getNextToken();  // eat identifier.
   
   if (CurTok != '=')
     return Error("expected '=' after for");
   getNextToken();  // eat '='.
   
   
   ExprAST *Start = ParseExpression();
   if (Start == 0) return 0;
   if (CurTok != ',')
     return Error("expected ',' after for start value");
   getNextToken();
   
   ExprAST *End = ParseExpression();
   if (End == 0) return 0;
   
   // The step value is optional.
   ExprAST *Step = 0;
   if (CurTok == ',') {
     getNextToken();
     Step = ParseExpression();
     if (Step == 0) return 0;
   }
   
   if (CurTok != tok_in)
     return Error("expected 'in' after for");
   getNextToken();  // eat 'in'.
   
   ExprAST *Body = ParseExpression();
   if (Body == 0) return 0;
 
   return new ForExprAST(IdName, Start, End, Step, Body);
 }
 
 /// varexpr ::= 'var' identifier ('=' expression)? 
 //                    (',' identifier ('=' expression)?)* 'in' expression
 static ExprAST *ParseVarExpr() {
   getNextToken();  // eat the var.
 
   std::vector<std::pair<std::string, ExprAST*> > VarNames;
 
   // At least one variable name is required.
   if (CurTok != tok_identifier)
     return Error("expected identifier after var");
   
   while (1) {
     std::string Name = IdentifierStr;
     getNextToken();  // eat identifier.
 
     // Read the optional initializer.
     ExprAST *Init = 0;
     if (CurTok == '=') {

llvm/examples/Kaleidoscope/MCJIT/lazy/toy.cpp

enum Token {
   tok_var = -13
 };
 
 static std::string IdentifierStr;  // Filled in if tok_identifier
 static double NumVal;              // Filled in if tok_number
 
 /// gettok - Return the next token from standard input.
 static int gettok() {
-  static int LastChar = ' ';
+  static char LastChar = ' ';
 
   // Skip any whitespace.
   while (isspace(LastChar))
     LastChar = getchar();
 
   if (isalpha(LastChar)) { // identifier: [a-zA-Z][a-zA-Z0-9]*
     IdentifierStr = LastChar;
     while (isalnum((LastChar = getchar())))
static int GetTokPrecedence() {
   // Make sure it's a declared binop.
   int TokPrec = BinopPrecedence[CurTok];
   if (TokPrec <= 0) return -1;
   return TokPrec;
 }
 
 /// Error* - These are little helper functions for error handling.
 ExprAST *Error(const char *Str) { fprintf(stderr, "Error: %s\n", Str);return 0;}
 PrototypeAST *ErrorP(const char *Str) { Error(Str); return 0; }
 FunctionAST *ErrorF(const char *Str) { Error(Str); return 0; }
 
 static ExprAST *ParseExpression();
 
 /// identifierexpr
 ///   ::= identifier
 ///   ::= identifier '(' expression* ')'
 static ExprAST *ParseIdentifierExpr() {
   std::string IdName = IdentifierStr;
if (CurTok != ')') {
     while (1) {
       ExprAST *Arg = ParseExpression();
       if (!Arg) return 0;
       Args.push_back(Arg);
 
       if (CurTok == ')') break;
 
       if (CurTok != ',')
         return Error("Expected ')' or ',' in argument list");
       getNextToken();
     }
   }
 
   // Eat the ')'.
   getNextToken();
 
   return new CallExprAST(IdName, Args);
 }
 
 /// numberexpr ::= number
 static ExprAST *ParseNumberExpr() {
   ExprAST *Result = new NumberExprAST(NumVal);
   getNextToken(); // consume the number
   return Result;
 }
 
 /// parenexpr ::= '(' expression ')'
 static ExprAST *ParseParenExpr() {
   getNextToken();  // eat (.
   ExprAST *V = ParseExpression();
   if (!V) return 0;
 
   if (CurTok != ')')
     return Error("expected ')'");
   getNextToken();  // eat ).
   return V;
 }
 
 /// ifexpr ::= 'if' expression 'then' expression 'else' expression
 static ExprAST *ParseIfExpr() {
   getNextToken();  // eat the if.
 
   // condition.
   ExprAST *Cond = ParseExpression();
   if (!Cond) return 0;
 
   if (CurTok != tok_then)
     return Error("expected then");
   getNextToken();  // eat the then
 
   ExprAST *Then = ParseExpression();
   if (Then == 0) return 0;
 
   if (CurTok != tok_else)
     return Error("expected else");
 
   getNextToken();
 
   ExprAST *Else = ParseExpression();
   if (!Else) return 0;
 
   return new IfExprAST(Cond, Then, Else);
 }
 
 /// forexpr ::= 'for' identifier '=' expr ',' expr (',' expr)? 'in' expression
 static ExprAST *ParseForExpr() {
   getNextToken();  // eat the for.
 
   if (CurTok != tok_identifier)
     return Error("expected identifier after for");
 
   std::string IdName = IdentifierStr;
   getNextToken();  // eat identifier.
 
   if (CurTok != '=')
     return Error("expected '=' after for");
   getNextToken();  // eat '='.
 
 
   ExprAST *Start = ParseExpression();
   if (Start == 0) return 0;
   if (CurTok != ',')
     return Error("expected ',' after for start value");
   getNextToken();
 
   ExprAST *End = ParseExpression();
   if (End == 0) return 0;
 
   // The step value is optional.
   ExprAST *Step = 0;
   if (CurTok == ',') {
     getNextToken();
     Step = ParseExpression();
     if (Step == 0) return 0;
   }
 
   if (CurTok != tok_in)
     return Error("expected 'in' after for");
   getNextToken();  // eat 'in'.
 
   ExprAST *Body = ParseExpression();
   if (Body == 0) return 0;
 
   return new ForExprAST(IdName, Start, End, Step, Body);
 }
 
 /// varexpr ::= 'var' identifier ('=' expression)?
 //                    (',' identifier ('=' expression)?)* 'in' expression
 static ExprAST *ParseVarExpr() {
   getNextToken();  // eat the var.
 
   std::vector<std::pair<std::string, ExprAST*> > VarNames;
 
   // At least one variable name is required.
   if (CurTok != tok_identifier)
     return Error("expected identifier after var");
 
   while (1) {
     std::string Name = IdentifierStr;
     getNextToken();  // eat identifier.
 
     // Read the optional initializer.
     ExprAST *Init = 0;
     if (CurTok == '=') {