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Lots of comments and cleanup

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Clemens-Dautermann 2020-12-17 21:36:39 +01:00
parent 120a575b15
commit 1a95fc2371
8 changed files with 351 additions and 518 deletions
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4
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4
Compiler/DevFunctions.cs
View file

@ -112,12 +112,12 @@ namespace Compiler
{
*/
string file = "/home/clemens/repositorys/lcc/stage_3/valid/sub.c";
string file = "/home/clemens/repositorys/lcc/stage_3/valid/complicated.c";
Console.WriteLine("-------------");
List<Token> tokens = TestLexer(file, 0);
Node programNode = TestParser(tokens, file, 1);
TestGenerator(programNode, 1);
//TestGenerator(programNode, 1);
//}
/*

7
Compiler/Generator/Generator.cs
View file

@ -92,10 +92,11 @@ namespace Compiler.Generator
s = $"{Generate(rootNode.Children[0])}" +
"push %rax\n" +
$"{Generate(rootNode.Children[1])}" +
"movl %eax, %ecx" + //move calculated divisor to %ecx
"pop %rbx\n" + //pop divident do %ebx
"movl %eax, %ecx\n" + //move calculated divisor to %ecx
"pop %rax\n" + //pop divident do %eax
"cdq\n" +
"idivl %ecx\n";
"divl %ecx\n" +
"movl %ecx, %eax\n";
break;
default:
throw new ArgumentOutOfRangeException();

552
Compiler/Parser/Parser.cs
View file

@ -34,291 +34,327 @@ namespace Compiler.Parser
//The main RDP function
public Node Parse(NodeType nodeType, bool unopPrecedence = false)
{
//declare node to be returned
Node n;
//switch over the nodeType to check in which part of the parser we are
switch (nodeType)
{
//parse the root programm node
case NodeType.ProgramNode:
n = new ProgramNode();
//if this node is a program node, the next one must be a function node
Node childNode = Parse(NodeType.FunctionNode);
n.Children.Add(childNode);
break;
return ParseProgrammNode();
//parse the function node
case NodeType.FunctionNode:
n = new FunctionNode();
//check each element of the signature and raise corresponding errors
CheckFirstTokenAndRemove(TokenType.IntToken);
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IdentifierToken);
}
if (_tokenList[0].Value != null)
{
if (_tokenList[0].TokenType == TokenType.IdentifierToken)
{
((FunctionNode) n).Name = _tokenList[0].Value.ToString();
}
else
{
throw new UnexpectedTokenException(TokenType.IdentifierToken, _tokenList[0].TokenType);
}
}
else
{
throw new InvalidIdentifierException(null);
}
//remove <id>
_tokenList.RemoveAt(0);
CheckFirstTokenAndRemove(TokenType.OpenParenthesisToken);
CheckFirstTokenAndRemove(TokenType.CloseParenthesisToken);
CheckFirstTokenAndRemove(TokenType.OpenBraceToken);
//add returned child node to AST
n.Children.Add(Parse(NodeType.ReturnStatementNode));
//remove trailing }
CheckFirstTokenAndRemove(TokenType.CloseBraceToken);
break;
return ParseFunctionNode();
//parse the whole return statement
case NodeType.ReturnStatementNode:
//TODO: This Type of return/statement node will probably need fixing later
n = new ReturnNode();
//get return token and remove it
CheckFirstTokenAndRemove(TokenType.ReturnToken);
//add returned child node to AST
n.Children.Add(Parse(NodeType.ExpressionNode));
//remove trailing ;
CheckFirstTokenAndRemove(TokenType.SemicolonToken);
break;
return ParseReturnNode();
case NodeType.ExpressionNode:
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
//an expression always has a first term
//this first term is parsed here
Node firstTerm = Parse(NodeType.TermNode);
n = firstTerm;
//get next token
Token expressionToken = _tokenList[0];
//if the next token is a + or a - it must be a binary operator because we are in an expression
//that means that this is not a plain constant but a BinaryOperator node
//also check if the last token was a unary operator
while ((expressionToken.TokenType == TokenType.AdditionToken ||
expressionToken.TokenType == TokenType.NegationToken) && !unopPrecedence)
{
//remove the - or + token
_tokenList.RemoveAt(0);
switch (expressionToken.TokenType)
{
//1. create a BinOp Node
//2. Add the first term as a child
//3. Parse the rest as an expression and add it as the second term
case TokenType.AdditionToken:
n = new BinaryOperatorNode(OperatorType.Addition);
n.Children.Add(firstTerm);
n.Children.Add(Parse(NodeType.ExpressionNode));
break;
case TokenType.NegationToken:
n = new BinaryOperatorNode(OperatorType.Subtraction);
n.Children.Add(firstTerm);
n.Children.Add(Parse(NodeType.ExpressionNode));
break;
default:
//this should never happen because the while loop checks for token types, that are
//handled by case statements above only
throw new Exception("WeirdException");
}
//if there are still tokens left over pop one off
if (_tokenList.Count > 0)
{
expressionToken = _tokenList[0];
}
else
{
//there must be tokens left because we are in an expression.
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
}
break;
return ParseExpressionNode(unopPrecedence);
//the case for term node is almost the same as the one for expression node
case NodeType.TermNode:
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
//parse first factor
Node firstFactor = Parse(NodeType.FactorNode);
n = firstFactor;
Token termToken = _tokenList[0];
//parse second factor if it exists
while ((termToken.TokenType == TokenType.MultiplicationToken ||
termToken.TokenType == TokenType.DivisionToken) && !unopPrecedence)
{
_tokenList.RemoveAt(0);
switch (termToken.TokenType)
{
case TokenType.MultiplicationToken:
n = new BinaryOperatorNode(OperatorType.Multiplication);
n.Children.Add(firstFactor);
n.Children.Add(Parse(NodeType.TermNode));
break;
case TokenType.DivisionToken:
n = new BinaryOperatorNode(OperatorType.Division);
n.Children.Add(firstFactor);
n.Children.Add(Parse(NodeType.TermNode));
break;
default:
throw new Exception("WeirdException");
}
if (_tokenList.Count > 0)
{
termToken = _tokenList[0];
}
else
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
}
break;
return ParseTermNode(unopPrecedence);
case NodeType.FactorNode:
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
Token factorToken = _tokenList[0];
//switch over possible next tokens. There are three possible options
switch (factorToken.TokenType)
{
//first option:
//a parenthesised expression follows.
case TokenType.OpenParenthesisToken:
//check and remove openParenthesis (it has already been checked in the case, so removal would be enough)
CheckFirstTokenAndRemove(TokenType.OpenParenthesisToken);
//parse the things inside as an expression
n = Parse(NodeType.ExpressionNode);
//check if close parenthesis is supplied
CheckFirstTokenAndRemove(TokenType.CloseParenthesisToken);
break;
//second option:
//this is a unary operator expression
case TokenType.NegationToken:
case TokenType.BitwiseComplementToken:
case TokenType.LogicalNegationToken:
//just parse this as a unary operator node
n = Parse(NodeType.UnaryOperatorNode);
break;
//this is an integer literal.
case TokenType.IntegerLiteralToken:
//parse it as a constant
n = Parse(NodeType.ConstantNode);
break;
default:
throw new UnexpectedTokenException(TokenType.IntegerLiteralToken,
factorToken.TokenType);
}
break;
return ParseFactorNode();
//code to parse unary operator nodes
case NodeType.UnaryOperatorNode:
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
else
{
//get operator
Token unaryOperator = _tokenList[0];
_tokenList.RemoveAt(0);
//switch over three different operators and parse the rest as an expression
switch (unaryOperator.TokenType)
{
case TokenType.BitwiseComplementToken:
n = new UnaryOperatorNode(OperatorType.BitwiseComplement);
n.Children.Add(Parse(NodeType.ExpressionNode, unopPrecedence = true));
break;
case TokenType.NegationToken:
n = new UnaryOperatorNode(OperatorType.Negation);
n.Children.Add(Parse(NodeType.ExpressionNode, unopPrecedence = true));
break;
case TokenType.LogicalNegationToken:
n = new UnaryOperatorNode(OperatorType.LogicalNegation);
n.Children.Add(Parse(NodeType.ExpressionNode, unopPrecedence = true));
break;
default:
throw new UnexpectedTokenException(TokenType.IntegerLiteralToken,
unaryOperator.TokenType);
}
}
break;
return ParseUnopNode(unopPrecedence);
//parse constant nodes
case NodeType.ConstantNode:
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
//double check, for safety. Pbly unnecesarry
if (_tokenList[0].TokenType != TokenType.IntegerLiteralToken)
{
throw new UnexpectedTokenException(TokenType.IntegerLiteralToken, _tokenList[0].TokenType);
}
else
{
//return final constant node to end recursion
n = new ConstantNode((int) _tokenList[0].Value);
_tokenList.RemoveAt(0);
break;
}
return ParseConstantNode();
//default case if the supplied NodeType is unknown
default:
throw new Exception("Unknown Node Type " + nodeType);
}
}
private Node ParseProgrammNode()
{
Node n = new ProgramNode();
//if this node is a program node, the next one must be a function node
Node childNode = Parse(NodeType.FunctionNode);
n.Children.Add(childNode);
return n;
}
private Node ParseFunctionNode()
{
Node n = new FunctionNode();
//check each element of the signature and raise corresponding errors
//check if the first element is "int"
CheckFirstTokenAndRemove(TokenType.IntToken);
//check if the next token is an identifier, but don't remove it
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IdentifierToken);
}
//check if the identifier has a value
if (_tokenList[0].Value != null)
{
//check if the first token is really an identifier
if (_tokenList[0].TokenType == TokenType.IdentifierToken)
{
//assign the function name
((FunctionNode) n).Name = _tokenList[0].Value.ToString();
}
else
{
throw new UnexpectedTokenException(TokenType.IdentifierToken, _tokenList[0].TokenType);
}
}
else
{
throw new InvalidIdentifierException(null);
}
//remove <id>
_tokenList.RemoveAt(0);
//check (){
CheckFirstTokenAndRemove(TokenType.OpenParenthesisToken);
CheckFirstTokenAndRemove(TokenType.CloseParenthesisToken);
CheckFirstTokenAndRemove(TokenType.OpenBraceToken);
//add returned child node to AST
n.Children.Add(Parse(NodeType.ReturnStatementNode));
//remove trailing }
CheckFirstTokenAndRemove(TokenType.CloseBraceToken);
return n;
}
private Node ParseReturnNode()
{
//TODO: This Type of return/statement node will probably need fixing later
Node n = new ReturnNode();
//get return token and remove it
CheckFirstTokenAndRemove(TokenType.ReturnToken);
//add returned child node to AST
n.Children.Add(Parse(NodeType.ExpressionNode));
//remove trailing ;
CheckFirstTokenAndRemove(TokenType.SemicolonToken);
return n;
}
private Node ParseExpressionNode(bool unopPrecedence)
{
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
//an expression always has a first term
//this first term is parsed here
Node firstTerm = Parse(NodeType.TermNode);
Node n = firstTerm;
//get next token
Token expressionToken = _tokenList[0];
//if the next token is a + or a - it must be a binary operator because we are in an expression
//that means that this is not a plain constant but a BinaryOperator node
//also check if the last token was a unary operator
while ((expressionToken.TokenType == TokenType.AdditionToken ||
expressionToken.TokenType == TokenType.NegationToken) && !unopPrecedence)
{
//remove the - or + token
_tokenList.RemoveAt(0);
switch (expressionToken.TokenType)
{
//1. create a BinOp Node
//2. Add the first term as a child
//3. Parse the rest as an expression and add it as the second term
case TokenType.AdditionToken:
n = new BinaryOperatorNode(OperatorType.Addition);
n.Children.Add(firstTerm);
n.Children.Add(Parse(NodeType.ExpressionNode));
break;
case TokenType.NegationToken:
n = new BinaryOperatorNode(OperatorType.Subtraction);
n.Children.Add(firstTerm);
n.Children.Add(Parse(NodeType.ExpressionNode));
break;
default:
//this should never happen because the while loop checks for token types, that are
//handled by case statements above only
throw new Exception("WeirdException");
}
//if there are still tokens left over pop one off
if (_tokenList.Count > 0)
{
expressionToken = _tokenList[0];
}
else
{
//there must be tokens left because we are in an expression.
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
}
return n;
}
private Node ParseTermNode(bool unopPrecedence)
{
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
//parse first factor
Node firstFactor = Parse(NodeType.FactorNode);
Node n = firstFactor;
Token termToken = _tokenList[0];
//parse second factor if it exists
while ((termToken.TokenType == TokenType.MultiplicationToken ||
termToken.TokenType == TokenType.DivisionToken) && !unopPrecedence)
{
_tokenList.RemoveAt(0);
switch (termToken.TokenType)
{
case TokenType.MultiplicationToken:
n = new BinaryOperatorNode(OperatorType.Multiplication);
n.Children.Add(firstFactor);
n.Children.Add(Parse(NodeType.TermNode));
break;
case TokenType.DivisionToken:
n = new BinaryOperatorNode(OperatorType.Division);
n.Children.Add(firstFactor);
n.Children.Add(Parse(NodeType.TermNode));
break;
default:
throw new Exception("WeirdException");
}
if (_tokenList.Count > 0)
{
termToken = _tokenList[0];
}
else
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
}
return n;
}
private Node ParseFactorNode()
{
Node n;
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
Token factorToken = _tokenList[0];
//switch over possible next tokens. There are three possible options
switch (factorToken.TokenType)
{
//first option:
//a parenthesised expression follows.
case TokenType.OpenParenthesisToken:
//check and remove openParenthesis (it has already been checked in the case, so removal would be enough)
CheckFirstTokenAndRemove(TokenType.OpenParenthesisToken);
//parse the things inside as an expression
n = Parse(NodeType.ExpressionNode);
//check if close parenthesis is supplied
CheckFirstTokenAndRemove(TokenType.CloseParenthesisToken);
break;
//second option:
//this is a unary operator expression
case TokenType.NegationToken:
case TokenType.BitwiseComplementToken:
case TokenType.LogicalNegationToken:
//just parse this as a unary operator node
n = Parse(NodeType.UnaryOperatorNode);
break;
//this is an integer literal.
case TokenType.IntegerLiteralToken:
//parse it as a constant
n = Parse(NodeType.ConstantNode);
break;
default:
throw new UnexpectedTokenException(TokenType.IntegerLiteralToken,
factorToken.TokenType);
}
return n;
}
private Node ParseUnopNode(bool unopPrecedence)
{
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
Node n;
//get operator
Token unaryOperator = _tokenList[0];
_tokenList.RemoveAt(0);
//switch over three different operators and parse the rest as an expression
switch (unaryOperator.TokenType)
{
case TokenType.BitwiseComplementToken:
n = new UnaryOperatorNode(OperatorType.BitwiseComplement);
n.Children.Add(Parse(NodeType.ExpressionNode, unopPrecedence = true));
break;
case TokenType.NegationToken:
n = new UnaryOperatorNode(OperatorType.Negation);
n.Children.Add(Parse(NodeType.ExpressionNode, unopPrecedence = true));
break;
case TokenType.LogicalNegationToken:
n = new UnaryOperatorNode(OperatorType.LogicalNegation);
n.Children.Add(Parse(NodeType.ExpressionNode, unopPrecedence = true));
break;
default:
throw new UnexpectedTokenException(TokenType.IntegerLiteralToken,
unaryOperator.TokenType);
}
return n;
}
private Node ParseConstantNode()
{
if (_tokenList.Count == 0)
{
throw new MissingTokenException(TokenType.IntegerLiteralToken);
}
//double check, for safety. Pbly unnecesarry
if (_tokenList[0].TokenType != TokenType.IntegerLiteralToken)
{
throw new UnexpectedTokenException(TokenType.IntegerLiteralToken, _tokenList[0].TokenType);
}
//return final constant node to end recursion
Node n = new ConstantNode((int) _tokenList[0].Value);
_tokenList.RemoveAt(0);
return n;
}
}

12
test.s Normal file
View file

@ -0,0 +1,12 @@
.globl main
main:
movl $3, %eax
push %rax
movl $2, %eax
pop %rcx
sub %ecx, %eax
push %rax
movl $1, %eax
pop %rcx
sub %ecx, %eax
ret