public static FuncBuilderHints EmitFunction(Namespace ns, FuncBuilderHints fbHints, ActionOnFuncBuilder action, out bool runAgain)
{
try {
//HACK
var emitter = CodeGenerator.Emitter;
emitter.RegistersWritten = 0;
var fb = new FuncBuilder(ns, fbHints, action);
var rw = emitter.RegistersWritten;
var scratch0Used = (rw & (1 << fb.Scratch0.Index)) != 0;
var scratch1Used = (rw & (1 << fb.Scratch1.Index)) != 0;
return(fb.RunOptimizer(scratch0Used, scratch1Used, out runAgain));
} finally {
Instance = null;
}
}
private FuncBuilder(Namespace ns, FuncBuilderHints builderHints, ActionOnFuncBuilder action)
{
Instance = this;
this.namespaceAndNextIndex = new NamespaceAndNextIndex(ns, 0);
this.BuilderHints = builderHints;
var pt = builderHints.PassTraits;
this.Scratch0 = pt.Scratch0;
this.Scratch1 = pt.Scratch1;
var emitter = CodeGenerator.Emitter;
var passTraits = BuilderHints.PassTraits;
var preserveLr = passTraits.PreserveLinkRegister;
var regsToPreserve = passTraits.RegisterMask & 0xf0;
emitter.EmitIfNecessary(Format14OpCode.PUSH, preserveLr, (byte)regsToPreserve);
if (preserveLr)
{
StackPointer += -4;
}
while (regsToPreserve != 0)
{
StackPointer += -4;
regsToPreserve &= (regsToPreserve - 1);
}
this.EndOfVariableRegion = StackPointer;
var avo = passTraits.AllocatedVariableOffset;
emitter.EmitIfNecessary(Format13OpCode.ADDSP, avo);
StackPointer += avo;
this.TheExitLabel = DeclareLabel("leave");
action(this);
TheExitLabel.Mark();
StackPointer += -avo;
emitter.EmitIfNecessary(Format13OpCode.ADDSP, -avo);
regsToPreserve = passTraits.RegisterMask & 0xf0;
emitter.EmitIfNecessary(Format14OpCode.POP, false, (byte)regsToPreserve);
Register bxRegister;
if (passTraits.PreserveLinkRegister)
{
bxRegister = new LowRegister(1);
emitter.EmitIfNecessary(Format14OpCode.POP, false, 1 << 1);
}
else
{
bxRegister = Register.LR;
}
emitter.Emit(Format5OpCode.BX, null, bxRegister);
if (inflightUtterances.Count > 0)
{
var allUtterances = "";
foreach (string utterance in inflightUtterances.Values)
{
if (allUtterances.Length > 0)
{
allUtterances += ",";
}
allUtterances += utterance;
}
throw new Exception(allUtterances);
}
}
