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);
}
}
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;
}
}