// Gens op codes for print statment.
// Calls system to print based on type of expr.
//
// Returns: Number of bytes generated.
public override int GenOpCodes(OpCodeGenParam param)
{
// Inits
int bytes = 0;
VarTableEntry varEntry = null;
VarTableEntry varEntryTrue = null;
VarTableEntry varEntryFalse = null;
HeapTableEntry heapEntryTrue = null;
HeapTableEntry heapEntryFalse = null;
IDASTNode idASTNode = null;
try
{
// Gen op codes for expr. Results in accum
bytes += expr.GenOpCodes(param);
// Create temp var on stack
varEntry = param.tables.CreateTempVarTableEntry();
varEntry.InUse = true;
param.tables.IncVarIsUseCount();
// Load accumlator to memory (results from expr )
//param.opCodes.AppendFormat("8D V{0} 00 ", varEntry.VarID);
param.AddBytes(0x8D);
param.AddByteForUpdate('V', varEntry.VarID);
param.AddBytes(0x00);
bytes += 3;
// Inc cur bytes
//param.curByte += 3;
// Check if int expr, or var dec of type int
if ((expr is IntExprASTNode) ||
((expr is IDASTNode) && (((IDASTNode)expr).SymbolTableEntry.DataType == DataType.DT_INT)))
{
// Load 1 int x reg
//param.opCodes.Append("A2 01 ");
param.AddBytes(0xA2, 0x01);
// Load into y register
//param.opCodes.AppendFormat("AC V{0} 00 ",varEntry.VarID);
param.AddBytes(0xAC);
param.AddByteForUpdate('V', varEntry.VarID);
param.AddBytes(0x00);
// Make system call
//param.opCodes.Append("FF ");
param.AddBytes(0xFF);
// Inc bytes
bytes += 6;
// Inc cur bytes
// param.curByte += 6;
}
// Else check if bool expr, or var dec with boolean type
else if ((expr is BooleanExprASTNode) ||
((expr is IDASTNode) && (((IDASTNode)expr).SymbolTableEntry.DataType == DataType.DT_BOOLEAN)))
{
// Create strings for true and false on heap.
// If already on their it wont allocate new
// ones, but use the same.
heapEntryTrue = param.tables.AddHeapTableEntry(param, "true");
heapEntryFalse = param.tables.AddHeapTableEntry(param, "false");
// Create temp vars on stack for true
varEntryTrue = param.tables.CreateTempVarTableEntry();
varEntryTrue.InUse = true;
param.tables.IncVarIsUseCount();
// Create temp var on stack for false
varEntryFalse = param.tables.CreateTempVarTableEntry();
varEntryFalse.InUse = true;
param.tables.IncVarIsUseCount();
// Load true string address in acc
//param.opCodes.AppendFormat("A9 H{0} ", heapEntryTrue.HeapID);
param.AddBytes(0xA9);
param.AddByteForUpdate('H', heapEntryTrue.HeapID);
// Move to temp var
//param.opCodes.AppendFormat("8D V{0} 00 ", varEntryTrue.VarID);
param.AddBytes(0x8D);
param.AddByteForUpdate('V', varEntryTrue.VarID);
param.AddBytes(0x00);
// Load true add in acc
//param.opCodes.AppendFormat("A9 H{0} ", heapEntryFalse.HeapID);
param.AddBytes(0xA9);
param.AddByteForUpdate('H', heapEntryFalse.HeapID);
// Move to temp var
//param.opCodes.AppendFormat("8D V{0} 00 ", varEntryFalse.VarID);
param.AddBytes(0x8D);
param.AddByteForUpdate('V', varEntryFalse.VarID);
param.AddBytes(0x00);
// Load false into y reg
//param.opCodes.AppendFormat("AC V{0} 00 ", varEntryFalse.VarID);
param.AddBytes(0xAC);
param.AddByteForUpdate('V', varEntryFalse.VarID);
param.AddBytes(0x00);
// Load 01 int x reg
//param.opCodes.Append("A2 01 ");
param.AddBytes(0xA2, 0x01);
// Compare results with results from acc
//param.opCodes.AppendFormat("EC V{0} 00 ", varEntry.VarID);
param.AddBytes(0xEC);
param.AddByteForUpdate('V', varEntry.VarID);
param.AddBytes(0x00);
// Branch on not equal x bytes
//param.opCodes.Append("D0 04 ");
param.AddBytes(0xD0, 0x03);
// Load true into y reg
//param.opCodes.AppendFormat("AC V{0} 00 ", varEntryTrue.VarID);
param.AddBytes(0xAC);
param.AddByteForUpdate('V', varEntryTrue.VarID);
param.AddBytes(0x00);
// Load 2 int x reg
//param.opCodes.Append("A2 02 ");
param.AddBytes(0xA2, 0x02);
// Make system call
//param.opCodes.Append("FF ");
param.AddBytes(0xFF);
// Inc bytes
bytes += 26;
// Inc cur bytes
//param.curByte += 26;
/*
* // Set temp vars not in use
* varEntryTrue.InUse = false;
* varEntryFalse.InUse = false;
* param.tables.DecVarInUseCount();
* param.tables.DecVarInUseCount();
* */
}
// Else check if string expr or var of string type
else if ((expr is StringExprASTNode) ||
((expr is IDASTNode) && (((IDASTNode)expr).SymbolTableEntry.DataType == DataType.DT_STRING)))
{
// Load into temp var
//param.opCodes.AppendFormat("8D
// Load expr res into y reg
//param.opCodes.AppendFormat("AC V{0} 00 ", varEntry.VarID);
param.AddBytes(0xAC);
param.AddByteForUpdate('V', varEntry.VarID);
param.AddBytes(0x00);
// Load 2 int x reg
//param.opCodes.Append("A2 02 ");
param.AddBytes(0xA2, 0x02);
// Make system call
//param.opCodes.Append("FF ");
param.AddBytes(0xFF);
// Increment bytes
bytes += 6;
// Inc cur bytes
//param.curByte += 6;
}
// Reset temp var
varEntry.InUse = false;
param.tables.DecVarInUseCount();
}
// Catch over 256 byte error,
// and throw up
catch (IndexOutOfRangeException ex)
{
throw ex;
}
// Return bytes added
return(bytes);
}
// Set constructor
public AssignmentStatementASTNode(IDASTNode id, ExprASTNode expr)
: this()
{
this.id = id;
this.expr = expr;
}
// Set constructor.
public VarDecStatementASTNode(TypeASTNode type, IDASTNode id)
: this()
{
this.type = type;
this.id = id;
}
// Default costructor, inits values
public AssignmentStatementASTNode()
: base(ASTNodeType.ASTTYPE_ASSIGNSTATEMENT)
{
id = null;
expr = null;
}
// Default costructor, inits values
public VarDecStatementASTNode()
: base(ASTNodeType.ASTTYPE_VARDEC)
{
id = null;
type = null;
}