public void Visit(BinaryExpressionNode expression)
{
if (new[] {Operator.NotEqual, Operator.LessThanOrEqual, Operator.GreaterThanOrEqual}.Contains(expression.Operator))
{
EmitComment("Prepare for binary operator " + expression.Operator);
Emit("ldc.i4", 1);
}
expression.Left.Accept(this);
expression.Right.Accept(this);
EmitComment("Binary operator " + expression.Operator);
switch (expression.Operator)
{
case Operator.Equal:
Emit("ceq");
break;
case Operator.NotEqual:
Emit("ceq");
Emit("sub");
break;
case Operator.LessThan:
Emit("clt");
break;
case Operator.LessThanOrEqual:
Emit("cgt");
Emit("sub");
break;
case Operator.GreaterThan:
Emit("cgt");
break;
case Operator.GreaterThanOrEqual:
Emit("clt");
Emit("sub");
break;
case Operator.Add:
Emit("add");
break;
case Operator.Subtract:
Emit("sub");
break;
case Operator.Multiply:
Emit("mul");
break;
case Operator.Divide:
Emit("div");
break;
default:
throw new Exception("Unsupported binary operator: " + expression.Operator);
}
}
public void Visit(BinaryExpressionNode expression)
{
string trueLabel = "cmp_true_" + _labelCount++;
bool isComparison = new[] {Operator.Equal, Operator.NotEqual, Operator.LessThan, Operator.LessThanOrEqual, Operator.GreaterThan, Operator.GreaterThanOrEqual}.Contains(expression.Operator);
if (isComparison)
Emit("ldc", "0");
expression.Left.Accept(this);
expression.Right.Accept(this);
EmitComment("Binary operator " + expression.Operator);
switch (expression.Operator)
{
case Operator.Equal:
Emit("if_icmpne", trueLabel);
break;
case Operator.NotEqual:
Emit("if_icmpeq", trueLabel);
break;
case Operator.LessThan:
Emit("if_icmpge", trueLabel);
break;
case Operator.LessThanOrEqual:
Emit("if_icmpgt", trueLabel);
break;
case Operator.GreaterThan:
Emit("if_icmple", trueLabel);
break;
case Operator.GreaterThanOrEqual:
Emit("if_icmplt", trueLabel);
break;
case Operator.Add:
Emit("iadd");
break;
case Operator.Subtract:
Emit("isub");
break;
case Operator.Multiply:
Emit("imul");
break;
case Operator.Divide:
Emit("idiv");
break;
default:
throw new Exception("Unsupported binary operator: " + expression.Operator);
}
if (isComparison)
{
Emit("ldc", "1");
Emit("iadd");
EmitLabel(trueLabel);
}
}
public void Visit(BinaryExpressionNode expression)
{
expression.Right.Accept(this);
expression.Left.Accept(this);
string op;
bool comparison = false;
switch (expression.Operator)
{
case Operator.Equal:
op = "===";
comparison = true;
break;
case Operator.NotEqual:
op = "!==";
comparison = true;
break;
case Operator.LessThan:
op = "<";
comparison = true;
break;
case Operator.LessThanOrEqual:
op = "<=";
comparison = true;
break;
case Operator.GreaterThan:
op = ">";
comparison = true;
break;
case Operator.GreaterThanOrEqual:
op = ">=";
comparison = true;
break;
case Operator.Add:
op = "+";
break;
case Operator.Subtract:
op = "-";
break;
case Operator.Multiply:
op = "*";
break;
case Operator.Divide:
op = "/";
break;
default:
throw new Exception("Unsupported binary operator: " + expression.Operator);
}
if (comparison)
Emit("stack.push(stack.pop() {0} stack.pop() ? 1 : 0);", op);
else if (expression.Operator == Operator.Divide)
Emit("stack.push(Math.floor(stack.pop() {0} stack.pop()));", op);
else
Emit("stack.push(stack.pop() {0} stack.pop());", op);
}
