public override Program Visit(Program program)
{
// Find constants which are repeated at least once
var finder = new FirstPass();
finder.Visit(program);
// Extract constats which are worth hoisting
foreach (var(val, count) in finder.Constants)
{
if (count <= 1)
{
continue;
}
var constLength = val.ToString().Length;
if (count * constLength <= (3 + constLength + count))
{
continue;
}
_replacements.Add(val, $"_{Guid.NewGuid().ToString().Replace("-", "_")}");
}
// Early exit if there are no replacements to do
if (_replacements.Count == 0)
{
return(program);
}
// Build set of assignments to insert
_constantInitializers = _replacements.Select(a => new Assignment(new VariableName(a.Value), a.Key.Type == Execution.Type.Number ? (BaseExpression) new ConstantNumber(a.Key.Number) : new ConstantString(a.Key.String))).ToArray <BaseStatement>();
return(base.Visit(program));
}
private static void CompileAndBuildExecutable()
{
var scan = new Scanner();
scan.SetSource(File.ReadAllText(FILE_LOCATION), 0);
var parser = new Parser(scan);
parser.Parse();
var root = parser.SyntaxTreeRoot;
var mgr = new ScopeManager();
var first = new FirstPass(root, mgr);
var second = new SecondPass(root, mgr);
first.Run();
second.Run();
const string asmName = "sample1-test";
var cg = new CodeGenerator(asmName);
cg.Generate(root);
cg.WriteAssembly();
}
public override Program Visit(Program program)
{
// Find all variables with a count of how frequent they are
var p = new FirstPass();
p.Visit(program);
// Generate some unique names, order by size
var names = Enumerable.Range(0, p.Names.Count()).Select(a => _names.Name()).OrderBy(a => a.Length).ToArray();
var vars = p.Names.OrderByDescending(a => a.Value).ThenBy(a => a.Key.Name).Select(a => a.Key).ToArray();
// Assign most common variables to shortest names
foreach (var(n1, n2) in vars.Zip(names, (a, b) => (a, b)))
{
_remap.Add(n1.Name, n2);
}
return(base.Visit(program));
}
public static void Main(string[] argv)
{
LabelDict labels;
if (argv.Length != 2)
{
Console.WriteLine("Usage: Assembler.exe assembly_file output_file");
}
//Make a first pass with given file
var fp = new FirstPass(argv[0]);
//clean the input on the forst pass and get labels
var commands = fp.GetCleanInput(out labels);
//parse all instructions
var pi = new ParseInstruction(commands, labels);
//open file and write output
using (var br = new BinaryWriter(File.Open(argv[1], FileMode.Create)))
{
var feedbeef = new byte[] { 0xfe, 0xed, 0xbe, 0xef };
//print magic header
br.Write(feedbeef);
//print the bytecode
foreach (BitArray b in pi.InstrList)
{
byte[] temp = new byte[4];
b.CopyTo(temp, 0);
br.Write(temp);
}
}
}
public void RegexCall()
{
_ = FirstPass.IsMatch(QueryText) && !SecondPass.IsMatch(QueryText);
}
