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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
Compiler/.idea/.idea.Compiler/.idea/contentModel.xml generated
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@ -1,8 +1,8 @@
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2
Compiler/.idea/.idea.Compiler/.idea/modules.xml generated
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7
Compiler/.idea/.idea.Compiler/.idea/riderModule.iml generated Normal file
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@ -0,0 +1,7 @@
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279
Compiler/.idea/.idea.Compiler/.idea/workspace.xml generated
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@ -20,8 +20,11 @@
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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("-------------"); Console.WriteLine("-------------");
List<Token> tokens = TestLexer(file, 0); List<Token> tokens = TestLexer(file, 0);
Node programNode = TestParser(tokens, file, 1); 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])}" + s = $"{Generate(rootNode.Children[0])}" +
"push %rax\n" + "push %rax\n" +
$"{Generate(rootNode.Children[1])}" + $"{Generate(rootNode.Children[1])}" +
"movl %eax, %ecx" + //move calculated divisor to %ecx "movl %eax, %ecx\n" + //move calculated divisor to %ecx
"pop %rbx\n" + //pop divident do %ebx "pop %rax\n" + //pop divident do %eax
"cdq\n" + "cdq\n" +
"idivl %ecx\n"; "divl %ecx\n" +
"movl %ecx, %eax\n";
break; break;
default: default:
throw new ArgumentOutOfRangeException(); throw new ArgumentOutOfRangeException();

128
Compiler/Parser/Parser.cs
View file

@ -34,36 +34,76 @@ namespace Compiler.Parser
//The main RDP function //The main RDP function
public Node Parse(NodeType nodeType, bool unopPrecedence = false) 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 over the nodeType to check in which part of the parser we are
switch (nodeType) switch (nodeType)
{ {
//parse the root programm node
case NodeType.ProgramNode: case NodeType.ProgramNode:
n = new ProgramNode(); return ParseProgrammNode();
//parse the function node
case NodeType.FunctionNode:
return ParseFunctionNode();
//parse the whole return statement
case NodeType.ReturnStatementNode:
return ParseReturnNode();
case NodeType.ExpressionNode:
return ParseExpressionNode(unopPrecedence);
//the case for term node is almost the same as the one for expression node
case NodeType.TermNode:
return ParseTermNode(unopPrecedence);
case NodeType.FactorNode:
return ParseFactorNode();
//code to parse unary operator nodes
case NodeType.UnaryOperatorNode:
return ParseUnopNode(unopPrecedence);
//parse constant nodes
case NodeType.ConstantNode:
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 //if this node is a program node, the next one must be a function node
Node childNode = Parse(NodeType.FunctionNode); Node childNode = Parse(NodeType.FunctionNode);
n.Children.Add(childNode); n.Children.Add(childNode);
break; return n;
}
case NodeType.FunctionNode: private Node ParseFunctionNode()
n = new FunctionNode(); {
Node n = new FunctionNode();
//check each element of the signature and raise corresponding errors //check each element of the signature and raise corresponding errors
//check if the first element is "int"
CheckFirstTokenAndRemove(TokenType.IntToken); CheckFirstTokenAndRemove(TokenType.IntToken);
//check if the next token is an identifier, but don't remove it
if (_tokenList.Count == 0) if (_tokenList.Count == 0)
{ {
throw new MissingTokenException(TokenType.IdentifierToken); throw new MissingTokenException(TokenType.IdentifierToken);
} }
//check if the identifier has a value
if (_tokenList[0].Value != null) if (_tokenList[0].Value != null)
{ {
//check if the first token is really an identifier
if (_tokenList[0].TokenType == TokenType.IdentifierToken) if (_tokenList[0].TokenType == TokenType.IdentifierToken)
{ {
//assign the function name
((FunctionNode) n).Name = _tokenList[0].Value.ToString(); ((FunctionNode) n).Name = _tokenList[0].Value.ToString();
} }
else else
@ -79,6 +119,7 @@ namespace Compiler.Parser
//remove <id> //remove <id>
_tokenList.RemoveAt(0); _tokenList.RemoveAt(0);
//check (){
CheckFirstTokenAndRemove(TokenType.OpenParenthesisToken); CheckFirstTokenAndRemove(TokenType.OpenParenthesisToken);
CheckFirstTokenAndRemove(TokenType.CloseParenthesisToken); CheckFirstTokenAndRemove(TokenType.CloseParenthesisToken);
CheckFirstTokenAndRemove(TokenType.OpenBraceToken); CheckFirstTokenAndRemove(TokenType.OpenBraceToken);
@ -89,12 +130,13 @@ namespace Compiler.Parser
//remove trailing } //remove trailing }
CheckFirstTokenAndRemove(TokenType.CloseBraceToken); CheckFirstTokenAndRemove(TokenType.CloseBraceToken);
break; return n;
}
case NodeType.ReturnStatementNode:
private Node ParseReturnNode()
{
//TODO: This Type of return/statement node will probably need fixing later //TODO: This Type of return/statement node will probably need fixing later
n = new ReturnNode(); Node n = new ReturnNode();
//get return token and remove it //get return token and remove it
CheckFirstTokenAndRemove(TokenType.ReturnToken); CheckFirstTokenAndRemove(TokenType.ReturnToken);
@ -106,10 +148,11 @@ namespace Compiler.Parser
//remove trailing ; //remove trailing ;
CheckFirstTokenAndRemove(TokenType.SemicolonToken); CheckFirstTokenAndRemove(TokenType.SemicolonToken);
break; return n;
}
case NodeType.ExpressionNode:
private Node ParseExpressionNode(bool unopPrecedence)
{
if (_tokenList.Count == 0) if (_tokenList.Count == 0)
{ {
throw new MissingTokenException(TokenType.IntegerLiteralToken); throw new MissingTokenException(TokenType.IntegerLiteralToken);
@ -118,7 +161,7 @@ namespace Compiler.Parser
//an expression always has a first term //an expression always has a first term
//this first term is parsed here //this first term is parsed here
Node firstTerm = Parse(NodeType.TermNode); Node firstTerm = Parse(NodeType.TermNode);
n = firstTerm; Node n = firstTerm;
//get next token //get next token
Token expressionToken = _tokenList[0]; Token expressionToken = _tokenList[0];
@ -164,12 +207,11 @@ namespace Compiler.Parser
} }
} }
break; return n;
}
//the case for term node is almost the same as the one for expression node
case NodeType.TermNode:
private Node ParseTermNode(bool unopPrecedence)
{
if (_tokenList.Count == 0) if (_tokenList.Count == 0)
{ {
throw new MissingTokenException(TokenType.IntegerLiteralToken); throw new MissingTokenException(TokenType.IntegerLiteralToken);
@ -177,7 +219,7 @@ namespace Compiler.Parser
//parse first factor //parse first factor
Node firstFactor = Parse(NodeType.FactorNode); Node firstFactor = Parse(NodeType.FactorNode);
n = firstFactor; Node n = firstFactor;
Token termToken = _tokenList[0]; Token termToken = _tokenList[0];
@ -213,10 +255,12 @@ namespace Compiler.Parser
} }
} }
break; return n;
}
private Node ParseFactorNode()
case NodeType.FactorNode: {
Node n;
if (_tokenList.Count == 0) if (_tokenList.Count == 0)
{ {
throw new MissingTokenException(TokenType.IntegerLiteralToken); throw new MissingTokenException(TokenType.IntegerLiteralToken);
@ -256,16 +300,18 @@ namespace Compiler.Parser
factorToken.TokenType); factorToken.TokenType);
} }
break; return n;
}
//code to parse unary operator nodes private Node ParseUnopNode(bool unopPrecedence)
case NodeType.UnaryOperatorNode: {
if (_tokenList.Count == 0) if (_tokenList.Count == 0)
{ {
throw new MissingTokenException(TokenType.IntegerLiteralToken); throw new MissingTokenException(TokenType.IntegerLiteralToken);
} }
else
{ Node n;
//get operator //get operator
Token unaryOperator = _tokenList[0]; Token unaryOperator = _tokenList[0];
_tokenList.RemoveAt(0); _tokenList.RemoveAt(0);
@ -289,13 +335,12 @@ namespace Compiler.Parser
throw new UnexpectedTokenException(TokenType.IntegerLiteralToken, throw new UnexpectedTokenException(TokenType.IntegerLiteralToken,
unaryOperator.TokenType); unaryOperator.TokenType);
} }
return n;
} }
break; private Node ParseConstantNode()
{
//parse constant nodes
case NodeType.ConstantNode:
if (_tokenList.Count == 0) if (_tokenList.Count == 0)
{ {
throw new MissingTokenException(TokenType.IntegerLiteralToken); throw new MissingTokenException(TokenType.IntegerLiteralToken);
@ -306,19 +351,10 @@ namespace Compiler.Parser
{ {
throw new UnexpectedTokenException(TokenType.IntegerLiteralToken, _tokenList[0].TokenType); throw new UnexpectedTokenException(TokenType.IntegerLiteralToken, _tokenList[0].TokenType);
} }
else
{
//return final constant node to end recursion //return final constant node to end recursion
n = new ConstantNode((int) _tokenList[0].Value); Node n = new ConstantNode((int) _tokenList[0].Value);
_tokenList.RemoveAt(0); _tokenList.RemoveAt(0);
break;
}
//default case if the supplied NodeType is unknown
default:
throw new Exception("Unknown Node Type " + nodeType);
}
return n; 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