/// <summary>
/// Seconds the pass.
/// TODO - refactor! break into smaller methods!!!
/// after the first symbol table filling pass,
/// we march thru the lines again, the parser gives us each command and its type
/// we pass these to the code generator to build our binary representation
/// </summary>
/// <param name="inputBytes">The input bytes.</param>
/// <param name="symbolTable">The symbol table.</param>
/// <returns></returns>
private string FinalPass(byte[] inputBytes)
{
MemoryStream inputStream = new MemoryStream(inputBytes);
using (Parser parser = new Parser(inputStream))
{
StringBuilder fullBinaryListing = new StringBuilder();
// magic number, new variables in the hack platform are stored from address 16 upwards.
int addressCounter = 16;
//TODO - horrible nested while and if chain - break into methods
while (parser.HasMoreCommands())
{
String binaryLine = String.Empty;
parser.Advance();
if (parser.CommandType() == Command.C_COMMAND)
{
binaryLine = CodeGenerator.GetFullCInstruction(parser.Comp(), parser.Dest(), parser.Jump()) + Environment.NewLine;
fullBinaryListing.Append(binaryLine);
}
else if (parser.CommandType() == Command.A_COMMAND)
{
binaryLine = this.Handle_A_Command(parser.Symbol(), ref addressCounter);
fullBinaryListing.Append(binaryLine + Environment.NewLine);
}
}
return(fullBinaryListing.ToString());
}
#endregion
}
/// <summary>
/// First pass of the assembly file.
/// Finds all symbols and stores them in a Dictionary along (with the next line number)
/// i.e. fills the symbol table
/// </summary>
/// <param name="inputBytes">The input bytes.</param>
/// <param name="symbolTable">The symbol table.</param>
private void FillSymbolTable(byte[] inputBytes)
{
using (MemoryStream inputStream = new MemoryStream(inputBytes))
using (Parser parser = new Parser(inputStream))
{
int lineCounter = 0;
while (parser.HasMoreCommands())
{
parser.Advance();
if (parser.CommandType() == Command.L_COMMAND)
{
// store the lable and next line
this.SymbolTable.AddEntry(parser.Symbol(), lineCounter);
}
else if (parser.CommandType() == Command.C_COMMAND ||
parser.CommandType() == Command.A_COMMAND)
{
// ignore non label commands in the asm file.
lineCounter++;
}
}
}
}
/// <summary>
/// First pass of the assembly file.
/// Finds all symbols and stores them in a Dictionary along (with the next line number)
/// i.e. fills the symbol table
/// </summary>
/// <param name="inputBytes">The input bytes.</param>
/// <param name="symbolTable">The symbol table.</param>
private void FillSymbolTable(byte[] inputBytes)
{
using (MemoryStream inputStream = new MemoryStream(inputBytes))
using (Parser parser = new Parser(inputStream))
{
int lineCounter = 0;
while (parser.HasMoreCommands())
{
parser.Advance();
if (parser.CommandType() == Command.L_COMMAND)
{
// store the lable and next line
this.SymbolTable.AddEntry(parser.Symbol(), lineCounter);
}
else if (parser.CommandType() == Command.C_COMMAND
|| parser.CommandType() == Command.A_COMMAND)
{
// ignore non label commands in the asm file.
lineCounter++;
}
}
}
}
public void SymbolTest()
{
Parser parser = new Parser();
parser.currentTxtCommand = "@0";
Assert.IsTrue(parser.Symbol() == "0");
parser.currentTxtCommand = "@Something";
Assert.IsTrue(parser.Symbol() == "Something");
parser.currentTxtCommand = "(foo)";
Assert.IsTrue(parser.Symbol() == "foo");
bool exceptionThrown = false;
try
{
parser.currentTxtCommand = "M=D+M";
parser.Symbol();
}
catch
{
exceptionThrown = true;
}
Assert.IsTrue(exceptionThrown);
}
/// <summary>
/// Seconds the pass.
/// TODO - refactor! break into smaller methods!!!
/// after the first symbol table filling pass,
/// we march thru the lines again, the parser gives us each command and its type
/// we pass these to the code generator to build our binary representation
/// </summary>
/// <param name="inputBytes">The input bytes.</param>
/// <param name="symbolTable">The symbol table.</param>
/// <returns></returns>
private string FinalPass(byte[] inputBytes)
{
MemoryStream inputStream = new MemoryStream(inputBytes);
using (Parser parser = new Parser(inputStream))
{
StringBuilder fullBinaryListing = new StringBuilder();
// magic number, new variables in the hack platform are stored from address 16 upwards.
int addressCounter = 16;
//TODO - horrible nested while and if chain - break into methods
while (parser.HasMoreCommands())
{
String binaryLine = String.Empty;
parser.Advance();
if (parser.CommandType() == Command.C_COMMAND)
{
binaryLine = CodeGenerator.GetFullCInstruction(parser.Comp(), parser.Dest(), parser.Jump()) + Environment.NewLine;
fullBinaryListing.Append(binaryLine);
}
else if (parser.CommandType() == Command.A_COMMAND)
{
binaryLine = this.Handle_A_Command(parser.Symbol(), ref addressCounter);
fullBinaryListing.Append(binaryLine + Environment.NewLine);
}
}
return fullBinaryListing.ToString();
}
#endregion
}
