private void Generate(AbstractNode node)
{
var debugNodeTypes = new NodeType[]
{
/*NodeType.Block,
* NodeType.Literal,
* NodeType.Identifier,
* NodeType.Loop,
* NodeType.Operation,*/
};
if (debugNodeTypes.Contains(node.Type))
{
Debug(node.ToString());
}
switch (node.Type)
{
case NodeType.Block:
((BlockNode)node).Statements.ForEach(Generate);
break;
case NodeType.Operation:
var operation = (OperationNode)node;
// Operations that require two integer as input
var integerOperations = new[]
{
OperatorType.BitwiseAnd,
OperatorType.AndAlso,
OperatorType.BitwiseOr,
OperatorType.OrElse
};
var outputIntegerOperations = new[]
{
OperatorType.Equals,
OperatorType.Greater,
OperatorType.NotGreater,
OperatorType.Less,
OperatorType.NotLess,
OperatorType.NotEquals
};
/*
* We accept floating only, sometimes we need integer (logical and/or)
* In this case, we cast the floating into an integer and cast back the result into a floating one.
*/
var requireInteger = integerOperations.Contains(operation.Operator);
var requireOutputTransform = outputIntegerOperations.Contains(operation.Operator);
Generate(operation.LeftOperand);
if (requireInteger)
{
Write("ftoi");
}
Generate(operation.RightOperand);
if (requireInteger)
{
Write("ftoi");
}
switch (operation.Operator)
{
case OperatorType.Add:
Write("add.f");
break;
case OperatorType.Sub:
Write("sub.f");
break;
case OperatorType.Mul:
Write("mul.f");
break;
case OperatorType.Div:
Write("div.f");
break;
case OperatorType.BitwiseAnd:
case OperatorType.AndAlso:
Write("and");
break;
case OperatorType.BitwiseOr:
case OperatorType.OrElse:
Write("or");
break;
case OperatorType.Equals:
Write("cmpeq.f");
break;
case OperatorType.NotEquals:
Write("cmpne.f");
break;
case OperatorType.NotGreater:
Write("cmple.f");
break;
case OperatorType.Less:
Write("cmplt.f");
break;
case OperatorType.NotLess:
Write("cmpge.f");
break;
case OperatorType.Greater:
Write("cmpgt.f");
break;
case OperatorType.EuclidianDiv:
Write(Drop());
Write(Drop());
Generate(BuiltinFunctions.EuclidianDiv(operation.LeftOperand, operation.RightOperand));
break;
case OperatorType.Mod:
Write(Drop());
Write(Drop());
Generate(BuiltinFunctions.Mod(operation.LeftOperand, operation.RightOperand));
break;
case OperatorType.Pow:
Write(Drop());
Write(Drop());
Generate(BuiltinFunctions.Pow(operation.LeftOperand, operation.RightOperand));
break;
}
if (requireInteger || requireOutputTransform)
{
Write("itof");
}
break;
case NodeType.Declaration:
var dcl = (AddressableDeclarationNode)node;
switch (dcl.Identifier.Symbol.Type)
{
case ObjectType.Floating:
Generate(dcl.Expression);
Write
(
Set(dcl.Identifier.Symbol.Pointer)
);
break;
case ObjectType.Pointer:
var indexExpressions = ((MultiExpressionNode)dcl.Expression).Expressions;
indexExpressions.Reverse();
AbstractExpressionNode finalExpression = LiteralNode.One;
for (var i = 0; i < indexExpressions.Count - 1; i++)
{
finalExpression = new OperationNode
(
OperatorType.Mul,
new OperationNode
(
OperatorType.Add,
LiteralNode.One,
indexExpressions[i]
),
finalExpression
);
}
finalExpression = new OperationNode
(
OperatorType.Mul,
indexExpressions.Last(),
finalExpression
);
Generate(BuiltinFunctions.BorrowMemory(finalExpression));
Write(Set(dcl.Identifier.Symbol.Pointer));
var tempVar = new AddressableIdentifierNode(new PrimitiveVariableSymbol("", PointerIndex + 1));
Write(Pushf());
Generate(BuiltinFunctions.BorrowMemory(new LiteralNode(indexExpressions.Count)));
Write(Set(tempVar.Symbol.Pointer));
indexExpressions.Reverse();
for (var i = 0; i < indexExpressions.Count; i++)
{
Generate
(
new PointerAssignationNode
(
new OperationNode
(
OperatorType.Add,
tempVar,
new LiteralNode(i)
),
indexExpressions[i]
)
);
}
/*
* var a = bmem(6);
* var b = bmem(2);
* :b = 2;
* :b + 1 = 2;
* init_array(a, b, 2);
*/
Generate(BuiltinFunctions.InitArray(dcl.Identifier, tempVar, new LiteralNode(indexExpressions.Count)));
Write(Get(tempVar.Symbol.Pointer));
Generate(BuiltinFunctions.RecoverMemory(tempVar));
break;
}
break;
case NodeType.Reference:
var refnode = (ReferenceNode)node;
Write
(
Pushf(refnode.Identifier.Symbol.Pointer)
);
break;
case NodeType.Dereference:
var deref = (DereferenceNode)node;
Generate(deref.Expression);
Writes
(
Ftoi(),
MemRead(),
Itof()
);
break;
case NodeType.Assignation:
var assign = (AssignationNode)node;
Generate(assign.ValueExpression);
Write
(
Set(assign.Identifier.Symbol.Pointer)
);
break;
case NodeType.Drop:
Write(Drop());
break;
case NodeType.PointerAssignation:
var ptrAssign = (PointerAssignationNode)node;
Generate(ptrAssign.AddressExpression);
Write
(
Ftoi()
);
Generate(ptrAssign.ValueExpression);
Writes
(
Ftoi(),
MemWrite()
);
break;
case NodeType.Literal:
var lit = (LiteralNode)node;
Write(Pushf(lit.Value));
break;
case NodeType.Identifier:
var ident = (AddressableIdentifierNode)node;
Write
(
Get(ident.Symbol.Pointer)
);
break;
case NodeType.Crash:
Write("halt");
break;
case NodeType.Print:
if (node is PrintExpressionNode)
{
var printe = (PrintExpressionNode)node;
Generate(printe.Expression);
Write("out.f");
}
else
{
var prints = (PrintStringNode)node;
foreach (var c in prints.Content)
{
Write($"push.i {(int)c}");
Write("out.c");
}
}
Write("push.i 10");
Write("out.c");
break;
case NodeType.Loop:
var loop = (LoopNode)node;
{
Write(DeclareLabel(BeginLoop(loop.UniqueId)));
Generate(loop.Conditional);
Write(DeclareLabel(IterationLoop(loop.UniqueId)));
Generate(loop.Iteration);
Write(Jump(BeginLoop(loop.UniqueId)));
Write(DeclareLabel(EndLoop(loop.UniqueId)));
}
break;
case NodeType.Break:
var breakNode = (BreakNode)node;
Write(Jump(EndLoop(breakNode.LoopId)));
break;
case NodeType.Continue:
var cont = (ContinueNode)node;
Write(Jump(EndIf(cont.CondId)));
break;
case NodeType.Conditional:
var cond = (ConditionalNode)node;
{
Generate(cond.Expression);
Write(JumpFalse(Else(cond.UniqueId)));
Generate(cond.TrueStatement);
Write(Jump(EndIf(cond.UniqueId)));
Write(DeclareLabel(Else(cond.UniqueId)));
Generate(cond.FalseStatement);
Write(DeclareLabel(EndIf(cond.UniqueId)));
}
break;
case NodeType.MultiExpression:
var multi = (MultiExpressionNode)node;
foreach (var expression in multi.Expressions)
{
Generate(expression);
}
break;
case NodeType.Function:
var fun = (FunctionNode)node;
Write(DeclareLabel(fun.Identifier.Symbol.Name));
PointerIndex = fun.Arguments.Count - 1;
PreGenerate(fun.Statement);
Generate(fun.Statement);
if (fun.Identifier.Symbol.Name != "start")
{
Write(Pushf());
Write(Ret());
}
else
{
Write(Halt());
}
break;
case NodeType.Return:
var ret = (ReturnNode)node;
Generate(ret.Expression);
Write(Ret());
break;
case NodeType.Call:
var call = (CallNode)node;
Write(Prep(call.Target.Symbol.Name));
foreach (var arg in call.Parameters)
{
Generate(arg);
}
Write(Call(call.Parameters.Count));
break;
case NodeType.Root:
var root = (RootNode)node;
foreach (var f in root.Functions)
{
Generate(f);
}
break;
}
}
public override AbstractStatementNode ReleaseInstruction()
{
return(BuiltinFunctions.RecoverMemory(new AddressableIdentifierNode(this)));
}