private bool ParseNegativeExpression(TokenReader reader, out Expression expression)
{
expression = null;
Token start = reader.Peek();
if (!this.Expect(reader, Keyword.Minus))
{
return false;
}
Expression inner = null;
if (!this.ParseFactorExpression(reader, out inner))
{
return false;
}
expression = new NegativeExpression(start, inner);
return true;
}
private bool TryEmitNegativeExpression(
NegativeExpression expression,
CompilerContext context,
Scope scope,
MethodImpl method,
out TypeDefinition valueType)
{
if (!this.TryEmitExpression(expression.Inner, context, scope, method, out valueType))
{
return false;
}
if (valueType.IsFloatingPoint)
{
method.Statements.Add(new AsmStatement { Instruction = "fchs" });
}
else if (valueType.IsPointer || valueType.IsClass || valueType.IsArray || valueType.IsInterface)
{
string message = string.Format(
System.Globalization.CultureInfo.CurrentCulture,
Properties.Resources.CodeGenerator_NegativeNotSupported,
valueType.FullName);
this.log.Write(new Message(
expression.Start.Path,
expression.Start.Line,
expression.Start.Column,
Severity.Error,
message));
return false;
}
else
{
method.Statements.Add(new AsmStatement { Instruction = "neg eax" });
}
return true;
}
