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NoCashGbaSymWriter.cs
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NoCashGbaSymWriter.cs
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using System.Collections.ObjectModel;
using System.Text;
using System.Text.RegularExpressions;
namespace FasToSym;
// Reference to No$Gba symbols: https://problemkaputt.de/gbatek-symbolic-debug-info.htm
internal partial class NoCashGbaSymWriter : IWriter
{
private const string Extension = ".sym";
private readonly byte[] Newline = Encoding.ASCII.GetBytes(Environment.NewLine);
private const string ARM = ".arm"; // following code is in 32bit/ARM format
private const string THUMB = ".thumb"; // following code is in 16bit/THUMB format
private const string BYTE = ".byt:"; // next NNNN bytes are 8bit data(dcb lines)
private const string WORD = ".wrd:"; // next NNNN bytes are 16bit data(dcw lines)
private const string DOUBLE = ".dbl:"; // next NNNN bytes are 32bit data(dcd lines)
private const string ASCII = ".asc:"; // next NNNN bytes are ascii data(quoted dcb lines)
private const string POOL = ".pool"; // dummy label(indicates that following is literal pool)
private struct SymbolLine(ulong address, string sourceLine)
{
public ulong address = address;
public string sourceLine = sourceLine;
}
private readonly Collection<SymbolLine> _symbolInformation = [];
public Collection<string> Errors { get; } = [];
public bool GenerateFrom(FasFile fasFile)
{
if (!fasFile.IsValid())
return false;
string outputFilePath = Path.Combine(fasFile.ParentDirectory, fasFile.FileNameNoExtension + Extension);
if (File.Exists(outputFilePath))
{
File.Delete(outputFilePath);
}
using FileStream fs = File.Create(outputFilePath);
if (!CollectInformation(fasFile))
{
Errors.Add("Error: There are no symbols or the symbols could not find its preprocessed source.");
return false;
}
WriteToFile(fs);
return true;
}
private bool CollectInformation(FasFile fasFile)
{
foreach (FasFile.AssemblyDump assemblyLine in fasFile.AssemblyDumps)
{
var sourceLines = fasFile.PreprocessedSourceLines.Where(sl => sl.offset == assemblyLine.offsetPreprocessedSourceLine).ToArray();
if (sourceLines.Length > 0)
{
_symbolInformation.Add(new SymbolLine(assemblyLine.address, sourceLines[0].line));
}
}
return _symbolInformation.Count > 0;
}
private void WriteToFile(FileStream fs)
{
bool fromLabel = false;
bool firstOrg = true;
foreach (SymbolLine symbol in _symbolInformation)
{
if (firstOrg == true &&
TestWriteOrg(fs, in symbol))
{
firstOrg = false;
continue;
}
else if (TestWriteCode16(fs, in symbol))
{
continue;
}
else if (TestLabel(fs, in symbol))
{
fromLabel = true;
continue;
}
else if (TestVariables(fs, in symbol))
{
fromLabel = false;
continue;
}
else if (fromLabel == true)
{
string[] array = symbol.sourceLine.Split(' ');
if (CheckIfIsDataTypes(array, out string line))
{
WriteLine(fs, symbol.address, line);
continue;
}
}
// normal code.
fromLabel = false;
}
}
private bool TestVariables(FileStream fs, in SymbolLine symbol)
{
string[] array = symbol.sourceLine.Split(' ');
if (array.Length > 1)
{
if (CheckIfIsDataTypes(array[1..], out string line))
{
WriteLine(fs, symbol.address, array[0]);
WriteLine(fs, symbol.address, line);
return true;
}
}
return false;
}
private bool TestLabel(FileStream fs, in SymbolLine symbol)
{
if (symbol.sourceLine.Contains(':'))
{
string[] array = symbol.sourceLine.Split(' ');
WriteLine(fs, symbol.address, array[0][..^1]);
if (array.Length > 1)
{
if (CheckIfIsDataTypes(array[1..], out string line))
{
WriteLine(fs, symbol.address, line);
}
}
return true;
}
return false;
}
private bool TestWriteCode16(FileStream fs, in SymbolLine symbol)
{
if (symbol.sourceLine == "code16")
{
WriteLine(fs, symbol.address, THUMB);
return true;
}
return false;
}
private bool TestWriteOrg(FileStream fs, in SymbolLine symbol)
{
Regex regex = IsOrg();
if (regex.IsMatch(symbol.sourceLine))
{
string value = symbol.sourceLine.Split('x')[1];
int decValue = Convert.ToInt32(value, 16);
WriteLine(fs, (ulong)decValue, ARM);
return true;
}
return false;
}
private void WriteLine(FileStream fs, ulong address, string text)
{
byte[] addressBytes = new UTF8Encoding(true).GetBytes(address.ToString("X8"));
fs.Write(addressBytes, 0, addressBytes.Length);
byte[] labelBytes = new UTF8Encoding(true).GetBytes($" {text}");
fs.Write(labelBytes, 0, labelBytes.Length);
fs.Write(Newline, 0, Newline.Length);
}
private bool CheckIfIsDataTypes(in string[] array, out string line)
{
line = string.Empty;
if (array.Length > 0)
{
// detect bytes
if (array[0] == "db" ||
array[0].StartsWith("db("))
{
int size = 1;
string[] countElements = array[1].Split(',');
if (countElements.Length > 1)
{
size *= countElements.Length;
}
line = BYTE + size.ToString("X4");
}
// detect words
else if (array[0] == "dw" ||
array[0].StartsWith("dw("))
{
int size = 2;
string[] countElements = array[1].Split(',');
if (countElements.Length > 1)
{
size *= countElements.Length;
}
line = WORD + size.ToString("X4");
}
// detect doubles
else if (array[0] == "dd" ||
array[0].StartsWith("dd("))
{
int size = 4;
string[] countElements = array[1].Split(',');
if (countElements.Length > 1)
{
size *= countElements.Length;
}
line = DOUBLE + size.ToString("X4");
}
}
return !string.IsNullOrEmpty(line);
}
[GeneratedRegex("org 0x[0-9]+")]
private static partial Regex IsOrg();
}