public override void OnCodeGenVisit(AssemblyGenerator assembler)
{
assembler.AllocMemory(Identifier);
if (Init != null)
{
Init.OnCodeGenVisit(assembler);
string postfix = ((VariableSymbol)symbol).VariableType == VariableType.Char ? "b" : "l";
string target = ((VariableSymbol)symbol).VariableType == VariableType.Char ? "%al" : "%eax";
assembler.EmitCode($"\tmov{postfix} {target}, {assembler.GetVariableOffset(this.Identifier)}(%ebp)");
}
}
public override void OnCodeGenVisit(AssemblyGenerator assembler)
{
int offset = assembler.GetVariableOffset(Identifier);
Value.OnCodeGenVisit(assembler);
if (Identifier.isVariable())
{
assembler.EmitCode($"\tmovl %eax, {offset}(%ebp)");
}
else
{
assembler.EmitCode($"\tmovl %eax, {offset}(%ebp)");
}
}
public override void OnCodeGenVisit(AssemblyGenerator assembler)
{
Expression.OnCodeGenVisit(assembler);
switch (Operator)
{
case UnaryOperator.Not:
assembler.EmitCode($"\tsete %al");
break;
case UnaryOperator.Address:
if (Expression.Type != SyntaxNodeType.Identifier)
{
throw new SemanticError("Cannot address rvalue");
}
Identifier addrVariable = Expression.As <Identifier>();
assembler.EmitCode($"\tleal {assembler.GetVariableOffset(addrVariable)}(%ebp),%eax");
break;
case UnaryOperator.Dereference:
assembler.EmitCode($"\tmovl (%eax),%eax");
break;
}
}
