// Default constructor. Inits values.
public OpCodeGenerator()
{
warningCount = 0;
errorCount = 0;
opCodeDataBytes = null;
outputOpCodesToFile = false;
tempOpCodeData = null;
tempTables = null;
opCodeBytes = 0;
}
// Default constructor. Must be created with necessary components.
public OpCodeGenParam(StringBuilder opCodes, byte[] opCodeDataBytes, DynamicBranchTreeNode <SymbolHashTable> curSymbTable
, OpCodeGenTempTables tables)
{
this.opCodes = opCodes;
this.opCodeDataBytes = opCodeDataBytes;
this.tables = tables;
this.curSymbTable = curSymbTable;
this.initVars = 0;
curByte = 0;
curSymbTableIndex = 0;
curBlockID = 0;
curHeapID = 50;
firstBlock = true;
insertBytes = new ArrayList(20);
}
// Generates op codes from ast.
public ProcessReturnValue GenerateOpCodes(ASTNode rootASTNode, DynamicBranchTreeNode <SymbolHashTable> rootSymbolTableNode)
{
// Inits
ProcessReturnValue ret = ProcessReturnValue.PRV_NONE;
OpCodeGenParam param;
bool error = false;
// Create temp tables
tempTables = new OpCodeGenTempTables();
tempOpCodeData = new StringBuilder(250);
// Create new byte array
opCodeDataBytes = new byte[256];
// Reset error and warning count
errorCount = 0;
warningCount = 0;
// Create op code gen param
param = new OpCodeGenParam(tempOpCodeData, opCodeDataBytes, rootSymbolTableNode, tempTables);
// Send message
SendGeneralMessage("Starting code generation phase...");
// Send message
SendGeneralMessage("Generating op codes...");
// Gen op codes
try
{
rootASTNode.GenOpCodes(param);
// Add final 00
param.AddBytes(0x00);
}
// Catch index out of range exption
// on over 256 byte error
catch (IndexOutOfRangeException ex)
{
SendError("Program ran over 256 bytes.");
// Send message
SendGeneralMessage("Op code generation complete.");
error = true;
}
// Send message
SendGeneralMessage("Op code generation complete.");
// If not errors
if (!error)
{
// Send message
SendGeneralMessage("Inserting memory locations...");
// Fill in memory locations and jump sizes
programData = FillInTempOpCodeValues(param);
// Send message
SendGeneralMessage("Completed inserting memory locations.");
// Send message
SendGeneralMessage("Code generation phase complete.");
// Send message
SendGeneralMessage("Compilation complete.");
// Set op code total bytes
opCodeBytes = programData.totalBytes;
}
// Else send error message
else
{
// Send message
SendGeneralMessage("Compilation completed with errors.");
}
//Determine return value
if (ErrorCount > 0)
{
ret = ProcessReturnValue.PRV_ERRORS;
}
else if (WarningCount > 0)
{
ret = ProcessReturnValue.PRV_WARNINGS;
}
else
{
ret = ProcessReturnValue.PRV_OK;
}
//Return code
return(ret);
}