void CompileCall(CallExpression call)
{
// Try to resolve the function
Symbol sym;
var callNameExpr = call.Target as NameExpression;
if (callNameExpr != null)
{
// Check if the target function is in scope
if (!Table.FindSymbol(callNameExpr.Name, out sym))
{
// The function is undefined or not in scope
// Throw an exception
throw LoreException.Create(Location).Describe($"Attempt to call undefined function '{callNameExpr.Name}'");
}
// Parse the arguments
var args = new LLVMValueRef [Math.Max(call.Arguments.Count, 0)];
for (var i = 0; i < args.Length; i++)
{
call.Arguments.Arguments [i].Visit(this);
args [i] = Stack.Pop().Value;
}
// The function is in scope
var callResult = LLVM.BuildCall(Builder, sym.Value, args, "tmpcall");
Stack.Push(Symbol.CreateAnonymous(callResult));
}
else
{
throw LoreException.Create(Location).Describe($"Attempt to call something that is everything but a function.");
}
}
/// <summary>
/// Pops a scope.
/// </summary>
/// <returns>The scope.</returns>
public void PopScope()
{
if (Scopes.Count <= 1)
{
throw LoreException.Create().Describe("Attempt to leave global scope.").Describe("This is a compiler bug.");
}
Scopes.Pop();
}
AssignStatement ParseAssignStatement()
{
var stmt = AssignStatement.Create(unit.Location);
// Parse identifiers
while (!unit.Match(LoreToken.Operator, "="))
{
// Parse name
var ident = ParseName();
var name = NamedParameter.Create(ident);
// Parse type
if (unit.Accept(LoreToken.Colon))
{
name.SetType(ParseName());
}
// Add the named parameter to the identifiers
stmt.AddIdentifier(name);
// Try parsing another identifier
if (!unit.Match(LoreToken.Operator, "="))
{
unit.Expect(LoreToken.Comma);
}
}
unit.Expect(LoreToken.Operator, "=");
// Parse expressions
do
{
var expr = ParseExpression();
stmt.AddExpression(expr);
} while (unit.Accept(LoreToken.Comma));
// Verify that all identifiers are satisfied
var pluralizeExpression = stmt.ExpressionCount > 1 ? "s" : string.Empty;
var pluralizeIdentifier = stmt.IdentifierCount > 1 ? "s" : string.Empty;
if (stmt.IdentifierCount > stmt.ExpressionCount)
{
var count = stmt.IdentifierCount - stmt.ExpressionCount;
var pluralizeDifference = count > 1 ? "s" : string.Empty;
throw LoreException.Create(stmt.Location)
.Describe($"Attempt to assign {stmt.ExpressionCount} expression{pluralizeExpression} to {stmt.IdentifierCount} identifier{pluralizeIdentifier}.")
.Resolve($"Add more expressions or remove {count} identifier{pluralizeDifference}.");
}
if (stmt.IdentifierCount < stmt.ExpressionCount)
{
var count = stmt.ExpressionCount - stmt.IdentifierCount;
var pluralizeDifference = count > 1 ? "s" : string.Empty;
throw LoreException.Create(stmt.Location)
.Describe($"Attempt to assign {stmt.ExpressionCount} expression{pluralizeExpression} to {stmt.IdentifierCount} identifier{pluralizeIdentifier}.")
.Resolve($"Discard {count} expression{pluralizeDifference} by using the _ operator.");
}
return(stmt);
}
public void Capture(string name)
{
if (Captures.Contains(name))
{
throw LoreException.Create()
.Describe($"Symbol '{name}' was captured multiple times.")
.Resolve($"Capture the symbol just once.");
}
Captures.Add(name);
}
/// <summary>
/// Create a new instance of the <see cref="Capture"/> class.
/// </summary>
/// <param name="unit">Unit.</param>
/// <param name="lex">Lex.</param>
public static Capture Create(ParsingUnit unit, Lexeme <LoreToken> lex)
{
if (lex.Is(LoreToken.Identifier))
{
return(new Capture(lex.Value, capturesAll: false));
}
if (lex.Is(LoreToken.Operator) && lex.Is("="))
{
return(new Capture(lex.Value, capturesAll: true));
}
// Invalid capture
throw LoreException.Create(unit.Location).Describe($"Not a capture: '{lex.Value}' ({lex.Token})");
}
IntegerExpression ParseInteger()
{
var expr = IntegerExpression.Create(unit.Location);
var literal = unit.Expect(LoreToken.IntLiteral).Value;
// Try parsing the string
ulong intval;
try {
intval = ulong.Parse(literal, NumberStyles.Integer);
} catch (Exception e) {
throw LoreException.Create(unit.Location).Describe($"Failed to parse integer literal: ${e.Message}");
}
// Determine the size of the integer
expr.SetSize(IntegerSize.ULong);
if (intval <= (byte)sbyte.MaxValue)
{
expr.SetSize(IntegerSize.SByte);
}
else if (intval <= byte.MaxValue)
{
expr.SetSize(IntegerSize.UByte);
}
else if (intval <= (ushort)short.MaxValue)
{
expr.SetSize(IntegerSize.SShort);
}
else if (intval <= ushort.MaxValue)
{
expr.SetSize(IntegerSize.UShort);
}
else if (intval <= int.MaxValue)
{
expr.SetSize(IntegerSize.SWord);
}
else if (intval <= uint.MaxValue)
{
expr.SetSize(IntegerSize.UWord);
}
else if (intval <= long.MaxValue)
{
expr.SetSize(IntegerSize.SLong);
}
// Set the value and return
expr.SetValue(intval);
return(expr);
}
void CompileAssignment(AssignStatement stmt, NamedParameter identifier, AstNode expr)
{
// Check if the variable already exists in the parent scope
Symbol sym;
if (Table.TopScope.FindSymbol(identifier.Name.Name, out sym))
{
// The variable already exists
throw LoreException.Create(Location)
.Describe($"Redefinition of variable '{identifier.Name.Name}'.")
.Describe($"Previous definition was at '{sym.Location}'.");
}
// Compile the expression
expr.Visit(this);
// Get the expression value and type
var exprVal = Stack.Pop().Value;
var exprValType = exprVal.TypeOf();
// Check if the identifier has a type
if (identifier.HasType)
{
var identType = Helper.GetBuiltinTypeFromString(identifier.Type.Name);
// Check if the type of the identifier is different
// from the type of the expression
if (!Helper.CompareType(identType, exprValType))
{
// Try casting the expression value to the expected type
exprVal = Helper.BuildCast(Builder, exprVal, identType);
}
// Set the type of the expression to the type of the identifier
exprValType = identType;
}
// Allocate the variable
var ptr = LLVM.BuildAlloca(Builder, exprValType, identifier.Name.Name);
// Store the value in the variable
LLVM.BuildStore(Builder, exprVal, ptr);
// Add the variable to the symbol table
var name = identifier.Name.Name;
sym = Symbol.CreatePtr(name, ptr, Location, stmt.Mutable);
Table.AddSymbol(sym);
}
public LLVMTypeRef GetBuiltinTypeFromString(string type)
{
switch (type)
{
case "void":
return(VoidType);
case "bool":
return(BoolType);
case "char":
case "int8":
return(Int8Type);
case "uint8":
return(UInt8Type);
case "int16":
return(Int16Type);
case "uint16":
return(UInt16Type);
case "int":
case "int32":
return(Int32Type);
case "uint":
case "uint32":
return(UInt32Type);
case "int64":
return(Int64Type);
case "uint64":
return(UInt64Type);
case "float":
return(FloatType);
case "double":
return(DoubleType);
case "string":
return(StringType);
}
throw LoreException.Create(Visitor.Location).Describe($"Unable to resolve type: '{type}'");
}
/// <summary>
/// Expect the specified token and string.
/// </summary>
/// <param name="token">Token.</param>
/// <param name="strval">Strval.</param>
public Lexeme <LoreToken> Expect(LoreToken token, string strval)
{
var current = Current;
if (Accept(token, strval))
{
return(current);
}
if (!See())
{
throw LoreException.Create(Location).Describe("Unexpected end of file.");
}
var next = Read();
throw LoreException.Create(Location).Describe($"Unexpected token: '{next.Value}' ({next.Token})");
}
void CompileName(NameExpression expr)
{
// Check if the variable exists
Symbol sym;
if (!Table.FindSymbol(expr.Name, out sym))
{
// The variable does not exist
// Throw an exception
throw LoreException.Create(Location).Describe($"Undefined variable: '{expr.Name}'");
}
// TODO: Check if the variable was captured
// Push the variable
Stack.Push(Symbol.CreateAnonymous(sym.Value));
}
FloatExpression ParseFloat()
{
var expr = FloatExpression.Create(unit.Location);
var literal = unit.Expect(LoreToken.FloatLiteral).Value;
// Try parsing the string
double floatval;
try {
floatval = double.Parse(literal, NumberStyles.Float, NumberFormatInfo.InvariantInfo);
} catch (Exception e) {
throw LoreException.Create(unit.Location).Describe($"Failed to parse float literal: ${e.Message}");
}
// Set the value and return
expr.SetValue(floatval);
return(expr);
}
/*
* => [captures...] expression
* or
* => [captures...] { code... }
* or
* (parameters...) => [captures...] expression
* or
* (parameters...) => [captures...] { code... }
*/
LambdaExpression ParseLambda(TupleExpression argumentList = null)
{
var lambda = LambdaExpression.Create(unit.Location);
// Parse parameter list
if (argumentList == null || argumentList.Count == 0)
{
if (unit.Match(LoreToken.OpenParen))
{
var parameters = ParseDeclarationArgumentList();
lambda.SetParameters(parameters);
}
}
else
{
var lst = new List <NamedParameter> ();
foreach (var argument in argumentList.Items)
{
var name = argument as NameExpression;
if (name == null)
{
throw LoreException.Create(unit.Location).Describe($"Invalid parameter list in lambda declaration.");
}
lst.Add(NamedParameter.Create(name));
}
lambda.SetParameters(lst);
}
// Expect arrow operator
unit.Expect(LoreToken.Operator, "=>");
// Create master code block
CodeBlock master = CodeBlock.Create(unit.Location);
// Parse captures
if (unit.Match(LoreToken.OpenBracket))
{
// Parse captures
unit.Expect(LoreToken.OpenBracket);
while (!unit.Match(LoreToken.CloseBracket))
{
var lex = unit.Read();
var capture = Capture.Create(unit, lex);
master.AddCapture(capture);
}
unit.Expect(LoreToken.CloseBracket);
}
// Parse block
if (unit.Match(LoreToken.OpenBrace))
{
var block = ParseBlockWithoutCaptures();
// Merge captures
master.Merge(block);
}
// Or parse expression
else
{
// Create return statement for the result of the expression
var retstmt = ReturnStatement.Create(unit.Location);
retstmt.SetExpression(ParseExpression());
// Create a new block with the return statement
var block = CodeBlock.Create(unit.Location);
block.AddChild(retstmt);
// Merge captures
master.Merge(block);
}
// Set the lambda body
lambda.SetBody(master);
Console.WriteLine(lambda);
return(lambda);
}
void CompileFunction(FunctionDeclaration funcdecl)
{
// Check if a symbol with the name of the function is already defined
Symbol sym = null;
// Check if only local functions should be generated
if (Table.TopScope.IsFunction)
{
// Declare the function
DeclareFunctionPrototype(funcdecl);
}
if (!Table.FindSymbol(funcdecl.Name, out sym))
{
throw LoreException.Create(funcdecl.Location).Describe($"Undefined function: '{funcdecl.Name}'.");
}
// Check if the symbol is a prototype
if (!sym.IsPrototype)
{
throw new LoreException(funcdecl.Location).Describe($"Function without prototype: '{funcdecl.Name}'.");
}
// Get the function prototype
LLVMValueRef functionRef = sym.Value;
// Enter a new scope for the function
Table.PushScope(Scope.CreateFunction(functionRef));
// Check if the function returns multiple values
var returnType = LLVM.VoidType();
var tupleReturnTypes = new LLVMTypeRef [0];
if (funcdecl.ReturnsTuple)
{
var count = funcdecl.TupleReturnTypes.Count;
tupleReturnTypes = new LLVMTypeRef [count];
for (var i = 0; i < count; i++)
{
var current = funcdecl.TupleReturnTypes [i];
tupleReturnTypes [i] = Helper.GetBuiltinTypeFromString(current.Name);
}
returnType = LLVM.StructType(tupleReturnTypes, true);
}
// Create the return type
else if (funcdecl.HasReturnType)
{
returnType = Helper.GetBuiltinTypeFromString(funcdecl.ReturnType.Name);
}
// Add function parameters
for (var i = 0; i < funcdecl.Parameters.Count; i++)
{
var argname = funcdecl.Parameters [i].Name.Name;
// Get the i-th function parameter
var param = LLVM.GetParam(functionRef, (uint)i);
// Set the correct name
LLVM.SetValueName(param, argname);
// Add the named parameter to the scope
Table.AddSymbol(Symbol.Create(argname, param, Location));
}
// Create the entry block for the function
var block = LLVM.AppendBasicBlock(functionRef, "entry");
LLVM.PositionBuilderAtEnd(Builder, block);
// Visit the function body
funcdecl.VisitChildren(this);
// Return void and clear the stack if the
// function return type is void
if (Helper.CompareType(returnType, LLVM.VoidType()))
{
// Build return statement
LLVM.BuildRetVoid(Builder);
}
else if (Stack.Count == 0)
{
// The function has a return type,
// but nothing was returned!
if (funcdecl.HasReturnType)
{
throw LoreException.Create(Location)
.Describe($"Function '{funcdecl.Name}' has return type '{funcdecl.ReturnType.Name}' but does not return anything!")
.Resolve($"Return a value of type '{funcdecl.ReturnType.Name}' or change the return type to 'void'.");
}
// There are no elements on the stack
// Just return void
LLVM.BuildRetVoid(Builder);
}
else if (funcdecl.ReturnsTuple && Stack.Count >= funcdecl.TupleReturnTypes.Count)
{
// Prepare element array
var elems = new LLVMValueRef [funcdecl.TupleReturnTypes.Count];
// Fill the element array
for (var i = 0; i < elems.Length; i++)
{
// Pop the element from the stack
var current = Stack.Pop().Value;
// Check if the current element is a defined symbol
if (Table.FindSymbolByRef(current, out sym))
{
// Check if the current element is a pointer
if (sym.IsPointer)
{
// Load the element
current = LLVM.BuildLoad(Builder, current, "tmpload");
}
}
// Cast the element to the right type
current = Helper.BuildCast(Builder, current, tupleReturnTypes [i]);
// Add the element to the array
elems [elems.Length - i - 1] = current;
}
// Build the return statement
LLVM.BuildAggregateRet(Builder, elems);
// What the hellt
}
else if (funcdecl.HasReturnType && Stack.Count > 0)
{
// There are elements on the stack
// Take the top element from the stack
var elem = Stack.Pop().Value;
// Check if the return element is a defined symbol
if (Table.FindSymbolByRef(elem, out sym))
{
// Check if the return element is a pointer
if (sym.IsPointer)
{
// Load the element
elem = LLVM.BuildLoad(Builder, elem, "tmpload");
}
}
Helper.BuildOptimalReturn(Builder, elem, returnType);
}
else
{
throw LoreException.Create(Location)
.Describe($"Unable to construct a return value for function '{funcdecl.Name}'.")
.Describe($"This is a compiler bug.");
}
// Validate the function
if (LLVM.VerifyFunction(functionRef, LLVMVerifierFailureAction.LLVMPrintMessageAction).Value != 0)
{
throw LoreException.Create(funcdecl.Location).Describe($"Function failed to compile: '{funcdecl.Name}'");
}
// Exit the scope of the function
Table.PopScope();
if (Table.TopScope.IsFunction)
{
var func = Table.TopScope.Function;
LLVM.PositionBuilderAtEnd(Builder, func.GetEntryBasicBlock());
}
// Add the function symbol
Table.AddSymbol(Symbol.Create(funcdecl.Name, functionRef, funcdecl.Location));
Stack.Clear();
}
internal void DeclareFunctionPrototype(FunctionDeclaration funcdecl)
{
// Prepare argument type array
var argumentCount = funcdecl.Parameters.Count;
var arguments = new LLVMTypeRef [Math.Max(argumentCount, 0)];
// Check if the function is already defined
Symbol sym;
if ((Table.TopScope.IsFunction && Table.TopScope.FindSymbol(funcdecl.Name, out sym)) ||
(!Table.TopScope.IsFunction && Table.FindSymbol(funcdecl.Name, out sym)))
{
var e = LoreException.Create(funcdecl.Location).Describe($"Redefinition of function '{funcdecl.Name}'!");
e.Describe($"Previous declaration was at {sym.Location}.");
e.Resolve($"Rename the function to avoid a collision.");
throw e;
}
// Add function parameter types to array
for (var i = 0; i < funcdecl.Parameters.Count; i++)
{
arguments [i] = Helper.GetBuiltinTypeFromString(funcdecl.Parameters [i].Type.Name);
}
// Check if the function returns multiple values
var returnType = LLVM.VoidType();
var tupleReturnTypes = new LLVMTypeRef [0];
if (funcdecl.ReturnsTuple)
{
var count = funcdecl.TupleReturnTypes.Count;
tupleReturnTypes = new LLVMTypeRef [count];
for (var i = 0; i < count; i++)
{
var current = funcdecl.TupleReturnTypes [i];
tupleReturnTypes [i] = Helper.GetBuiltinTypeFromString(current.Name);
}
returnType = LLVM.StructType(tupleReturnTypes, true);
}
// Create the return type
else if (funcdecl.HasReturnType)
{
returnType = Helper.GetBuiltinTypeFromString(funcdecl.ReturnType.Name);
}
// Create the function type
var functionType = LLVM.FunctionType(
ReturnType: returnType,
ParamTypes: arguments,
IsVarArg: LLVMFalse
);
// Create the actual function
var functionRef = LLVM.AddFunction(LLVMModule, funcdecl.Name, functionType);
LLVM.SetLinkage(functionRef, LLVMLinkage.LLVMExternalLinkage);
// Add the function prototype as a symbol
Table.AddSymbol(Symbol.CreatePrototype(funcdecl.Name, functionRef, funcdecl.Location));
}
public LLVMValueRef BuildCast(LLVMBuilderRef builder, LLVMValueRef elem, LLVMTypeRef targetType)
{
// Check if the type of the element equals the targe type
if (CompareType(elem, targetType))
{
// There is no need to cast
// Just return the element
return(elem);
}
// Strings need special handling
if (CompareType(targetType, StringType))
{
LLVMValueRef indices;
var gep = LLVM.BuildGEP(builder, elem, out indices, 0u, "tmpgep");
var ptr = LLVM.BuildPointerCast(builder, gep, StringType, "tmpptrcast");
return(ptr);
}
string strtype1, strtype2;
switch (targetType.TypeKind)
{
case LLVMTypeKind.LLVMIntegerTypeKind:
// Check if the integer fits
if (IsInteger(elem))
{
var lwidth = elem.TypeOf().GetIntTypeWidth();
var rwidth = targetType.GetIntTypeWidth();
if (lwidth > rwidth)
{
// The width of the result type is higher
// than the width of the element type
// Throw an exception
strtype1 = elem.TypeOf().PrintTypeToString();
strtype2 = targetType.PrintTypeToString();
throw LoreException.Create(Visitor.Location)
.Describe($"Unable to cast element of type '{strtype1}' to '{strtype2}':")
.Describe($"The element is too big for the target integer type.");
}
}
// Perform a float to signed integer cast if needed
else if (IsFloatOrDouble(elem))
{
elem = LLVM.BuildFPToSI(builder, elem, targetType, "tmpfptosicast");
}
// Unsupported element type
else
{
// Unable to perform a meaningful cast
strtype1 = elem.TypeOf().PrintTypeToString();
strtype2 = targetType.PrintTypeToString();
throw LoreException.Create(Visitor.Location).Describe($"Unable to cast element of type '{strtype1}' to '{strtype2}':");
}
// Perform an integer cast
return(LLVM.BuildIntCast(builder, elem, targetType, "tmpcast"));
case LLVMTypeKind.LLVMFloatTypeKind:
case LLVMTypeKind.LLVMDoubleTypeKind:
// Perform a signed integer to float cast if needed
if (IsInteger(elem))
{
elem = LLVM.BuildSIToFP(builder, elem, targetType, "tmpsitofpcast");
}
return(LLVM.BuildFPCast(builder, elem, targetType, "tmpfcast"));
}
// Unable to perform a meaningful cast
strtype1 = elem.TypeOf().PrintTypeToString();
strtype2 = targetType.PrintTypeToString();
throw LoreException.Create(Visitor.Location).Describe($"Unable to cast element of type '{strtype1}' to '{strtype2}':");
}
void CompileBinaryOperation(BinaryExpression expr)
{
// Compile the expression
expr.VisitChildren(this);
// Pop the right value from the stack
var right = Stack.Pop().Value;
var left = Stack.Pop().Value;
LLVMValueRef result = LLVMNull;
Func <LoreException> BuildUnsupportedBinaryOperationException = () => {
var l = left.TypeOf().PrintTypeToString().Trim();
var r = right.TypeOf().PrintTypeToString().Trim();
return(LoreException.Create(Location)
.Describe($"Invalid binary operation: {expr.Operation}")
.Describe($"The operation is unsupported on types '{l}' and '{r}'"));
};
if (expr.Operation == BinaryOperation.Assign)
{
// Try to find the symbol
Symbol sym;
if (!Table.FindSymbolByRef(left, out sym))
{
// There is nothing to process
throw BuildUnsupportedBinaryOperationException();
}
// Check if the variable is mutable
if (!sym.IsMutable)
{
// The variable is immutable
throw BuildUnsupportedBinaryOperationException();
}
// Check if the symbol is a pointer
if (!sym.IsPointer)
{
// It is not possible to assign a new value to
// the specified variable, since it is not a pointer
// and is therefore not allocated on the stack.
// Throw an exception
throw LoreException.Create(Location).Describe($"Attempt to modify constant: '{sym.Name}");
}
// Assign the new value to the variable
var targetType = left.TypeOf().GetElementType();
right = Helper.BuildCast(Builder, right, targetType);
LLVM.BuildStore(Builder, right, left);
// Set the result
result = right;
}
else if (Helper.IsInteger(left) && Helper.IsInteger(right))
{
switch (expr.Operation)
{
case BinaryOperation.Add:
result = LLVM.BuildAdd(Builder, left, right, "tmpadd");
break;
case BinaryOperation.Subtract:
result = LLVM.BuildSub(Builder, left, right, "tmpsub");
break;
case BinaryOperation.Divide:
result = LLVM.BuildUDiv(Builder, left, right, "tmpdiv");
break;
case BinaryOperation.Multiply:
result = LLVM.BuildMul(Builder, left, right, "tmpmul");
break;
default:
throw BuildUnsupportedBinaryOperationException();
}
}
else if ((Helper.IsFloatOrDouble(left) && Helper.IsInteger(right)) ||
(Helper.IsFloatOrDouble(right) && Helper.IsInteger(left)) ||
(Helper.IsFloatOrDouble(left) && Helper.IsFloatOrDouble(right)))
{
switch (expr.Operation)
{
case BinaryOperation.Add:
result = LLVM.BuildFAdd(Builder, left, right, "tmpfadd");
break;
case BinaryOperation.Subtract:
result = LLVM.BuildFSub(Builder, left, right, "tmpfsub");
break;
case BinaryOperation.Divide:
result = LLVM.BuildFDiv(Builder, left, right, "tmpfdiv");
break;
case BinaryOperation.Multiply:
result = LLVM.BuildFMul(Builder, left, right, "tmpfmul");
break;
default:
throw BuildUnsupportedBinaryOperationException();
}
}
else
{
throw BuildUnsupportedBinaryOperationException();
}
Stack.Push(Symbol.CreateAnonymous(result));
}
void CompileUnaryOperation(UnaryExpression expr)
{
// Compile the expression
expr.VisitChildren(this);
// Pop the right value from the stack
var right = Stack.Pop().Value;
LLVMValueRef result = LLVMNull;
Func <LoreException> BuildUnsupportedUnaryOperationException = () => {
var r = right.TypeOf().PrintTypeToString();
return(LoreException.Create(Location)
.Describe($"Invalid unary operation: {expr.Operation}")
.Describe($"The operation is unsupported on type '{r}'"));
};
if (Helper.IsBoolean(right))
{
if (expr.Operation == UnaryOperation.LogicalNot)
{
}
else
{
throw BuildUnsupportedUnaryOperationException();
}
}
else if (Helper.IsFloatOrDouble(right))
{
switch (expr.Operation)
{
case UnaryOperation.Negate:
result = LLVM.BuildFNeg(Builder, right, "unop");
break;
default:
throw BuildUnsupportedUnaryOperationException();
}
}
else if (Helper.IsInteger(right))
{
switch (expr.Operation)
{
case UnaryOperation.Negate:
result = LLVM.BuildNeg(Builder, right, "unop");
break;
case UnaryOperation.BitwiseNot:
result = LLVM.BuildNot(Builder, right, "unop");
break;
default:
throw BuildUnsupportedUnaryOperationException();
}
}
else
{
throw BuildUnsupportedUnaryOperationException();
}
Stack.Push(Symbol.CreateAnonymous(result));
}
AstNode ParseTerm()
{
// Try parsing a name
if (unit.Match(LoreToken.Identifier))
{
return(ParseName());
}
// Try parsing an integer
if (unit.Match(LoreToken.IntLiteral))
{
return(ParseInteger());
}
// Try parsing a float
if (unit.Match(LoreToken.FloatLiteral))
{
return(ParseFloat());
}
// Try parsing a list
if (unit.Match(LoreToken.OpenBracket))
{
return(ParseList());
}
// Try parsing a tuple, a lambda or an expression
if (unit.Match(LoreToken.OpenParen))
{
unit.Skip();
var istuple = false;
// Parse the first expression
var expr = ParseExpression();
// Create a temporary tuple expression
// that holds the arguments of the lambda expression
TupleExpression tmp = TupleExpression.Create(unit.Location);
tmp.Add(expr);
// Try parsing a tuple
TupleExpression tpl = null;
if (unit.Accept(LoreToken.Comma))
{
tpl = ParseTuple(expr);
istuple = true;
}
// Read the remaning parenthesis if
// we did not successfully parse a tuple
else
{
unit.Expect(LoreToken.CloseParen);
}
// Get the correct tuple
tpl = tpl ?? tmp;
// Try parsing a lambda expression
if (unit.Match(LoreToken.Operator, "=>"))
{
return(ParseLambda(tpl));
}
// Return the tuple if needed
if (istuple)
{
return(tpl);
}
// This is neither a tuple nor a lambda
// Just return the expression
return(expr);
}
// Try parsing a keyword
if (unit.Match(LoreToken.Keyword))
{
// TODO: Implement true, false, null, etc
switch (unit.Current.Value)
{
case "true":
unit.Skip();
// TODO: Return TrueExpression
return(null);
case "false":
unit.Skip();
// TODO: Return FalseExpression
return(null);
case "null":
unit.Skip();
// TODO: Return NullExpression
return(null);
}
}
// Try parsing a string
if (unit.Match(LoreToken.StringLiteral))
{
return(ParseString());
}
throw LoreException.Create(unit.Location).Describe("Unexpected end of term.");
}