public ProgramChunkBranch(Equality equality, ProgramChunkExpressionTerm termFirst, IProgramChunk trueChunk,
ProgramChunkExpressionTerm termSecond, IProgramChunk falseChunk)
{
this.equality = equality;
this.termFirst = termFirst;
this.termSecond = termSecond;
this.trueChunk = trueChunk;
this.falseChunk = falseChunk;
}
public string[] EmitChunk(IProgramChunk chunk)
{
string[] programLines;
LinkedList<string> lines = new LinkedList<string>();
if (chunk is ProgramChunkJumpTarget)
{
//Form: (label):
ProgramChunkJumpTarget activeChunk = (ProgramChunkJumpTarget)chunk;
lines.AddLast(activeChunk.Label + ":");
}
else if (chunk is ProgramChunkJumpUnconditional)
{
//Form: goto (label)
ProgramChunkJumpUnconditional activeChunk = (ProgramChunkJumpUnconditional)chunk;
lines.AddLast("goto " + activeChunk.Target.Label + ";");
}
else if (chunk is ProgramChunkAssignment)
{
//Form: (Var) (assign) (term op term)
ProgramChunkAssignment activeChunk = (ProgramChunkAssignment)chunk;
//1) determine the variable that will recieve this assignment.
//2) emit the code that will assign the expression to the variable.
//3) determine the expression that will that variable will be assigned to.
lines.AddLast(activeChunk.Variable.Name + " = " + EmitExpression(activeChunk.Expression) + ";");
}
else if (chunk is ProgramChunkLoop)
{
ProgramChunkLoop activeChunk = (ProgramChunkLoop)chunk;
lines.AddLast("while (true)");
foreach(string line in EmitBlock(activeChunk.InnerCode))
lines.AddLast(line);
}
else if (chunk is ProgramChunkBranch)
{
ProgramChunkBranch activeChunk = (ProgramChunkBranch)chunk;
//beq $a1 0 finish
string line = "if(";
//first term
if (activeChunk.TermFirst is BlockConstant)
line += ((BlockConstant)activeChunk.TermFirst).Constant.ToString();
else
line += ((BlockVariable)activeChunk.TermFirst).Name;
//equality
if (activeChunk.EqualityChecked == Equality.EQUAL)
line += " == ";
else if (activeChunk.EqualityChecked == Equality.NOT_EQUAL)
line += " != ";
else
line += " ?? ";
//second term
if (activeChunk.TermSecond is BlockConstant)
line += ((BlockConstant)activeChunk.TermSecond).Constant.ToString();
else
line += ((BlockVariable)activeChunk.TermSecond).Name;
line += ")";
lines.AddLast(line);
if (EmitChunk(activeChunk.TrueChunk).Length == 1)
lines.AddLast(EmitChunk(activeChunk.TrueChunk)[0]);
else
{
lines.AddLast("{");
foreach (string programLine in EmitChunk(activeChunk.TrueChunk))
lines.AddLast(programLine);
lines.AddLast("}");
}
if(!(activeChunk.FalseChunk is ProgramChunkNoOperation))
throw new Exception("BackendC - Unimplemented false branch.");
}
else
{
UtilDebugConsole.AddException(new ExceptionWarning("BackendC - No operation IProgramChunk found, emitting NOP."));
lines.AddLast("//NOP");
}
programLines = new string[lines.Count];
lines.CopyTo(programLines, 0);
return programLines;
}
