internal Instr GenJmp(OpCode op, int pc, out int pos)
{
vm.CurrentScope.lastpc = vm.CurrentScope.pc;
Instr instr = AppendInstruction(new Instr(op, pc));
vm.CurrentScope.pc++;
pos = vm.CurrentScope.pc;
return(instr);
}
public CodeGenScope PushOP(Instr instr)
{
if (pc >= MAX_INSTR_SIZE)
{
throw new Exception("too big code block");
}
lastpc = pc;
iseq.Add(instr);
pc++;
return(this);
}
public Instr Emit_Array(ArrayNode node)
{
int n;
GenValues(node, out n);
Instr instr = null;
if (n >= 0)
{
Pop(n);
AppendInstruction(GenOp_2(OpCode.Array, vm.CurrentScope.sp, n));
Push();
}
return(instr);
}
private void GenReturn(CodeGenScope s, OpCode op, int src)
{
if (no_peephole(s))
{
GenOp_1(s, op, src);
}
else
{
Instr data = s.Last;
if (data.insn == OpCode.Move && src == data.a)
{
s.pc = s.lastpc;
GenOp_1(s, op, data.b);
}
else if (data.insn != OpCode.Return)
{
GenOp_1(s, op, src);
}
}
}
private int GenJmp2(CodeGenScope scope, OpCode op, int a, int pc, int val)
{
int pos;
if (val != NOVAL)
{
Instr instr = scope.Last;
if (instr.insn == OpCode.Move && instr.a == a)
{
scope.pc = scope.lastpc;
a = instr.b;
}
}
scope.lastpc = scope.pc;
scope.PushOP(new Instr(op, a, pc));
pos = scope.pc;
return(pos);
}
public Instr Emit_Hash(HashNode node)
{
int len = 0;
for (var i = 0; i < node.keys.Count; ++i)
{
node.keys[i].Compile(this);
node.values[i].Compile(this);
len++;
}
Instr instr = null;
if (len >= 0)
{
Pop(len * 2);
AppendInstruction(GenOp_2(OpCode.Hash, vm.CurrentScope.sp, len));
Push();
}
return(instr);
}
internal Instr GenMove(int dst, int src, bool nopeep)
{
if (true)
{
goto normal;
}
else
{
Scope s = vm.CurrentScope;
Instr data = s.Last;
switch (data.insn)
{
case OpCode.Move:
if (dst == src)
{
return(null); /* remove useless MOVE */
}
if (data.b == dst && data.a == src) /* skip swapping MOVE */
{
return(null);
}
goto normal;
case OpCode.LoadNIL:
case OpCode.LoadSelf:
if (nopeep || data.a != src /*|| data.a < s->nlocals*/)
{
goto normal;
}
s.pc = s.lastpc;
GenOp_1(data.insn, dst);
break;
case OpCode.LoadI:
case OpCode.GetGV:
case OpCode.GetIV:
case OpCode.GetCV:
case OpCode.GetConst:
case OpCode.String:
case OpCode.Lambda:
case OpCode.Block:
case OpCode.Method:
if (nopeep || data.a != src /*|| data.a < s.nlocals*/)
{
goto normal;
}
s.pc = s.lastpc;
GenOp_2(data.insn, dst, data.b);
break;
default:
goto normal;
}
}
return(null);
normal:
return(AppendInstruction(new Instr(OpCode.Move, dst, src)));
// TODO: on_eval
//return;
}
internal Instr AppendInstruction(Instr c)
{
Code.Add(c);
return(c);
}
private void GenMove(CodeGenScope s, int dst, int src, bool nopeep)
{
if (no_peephole(s))
{
goto normal;
}
else
{
Instr data = s.Last;
switch (data.insn)
{
case OpCode.Move:
if (dst == src)
{
return; /* remove useless MOVE */
}
if (data.b == dst && data.a == src) /* skip swapping MOVE */
{
return;
}
goto normal;
case OpCode.LoadNIL:
case OpCode.LoadSelf:
if (nopeep || data.a != src /*|| data.a < s->nlocals*/)
{
goto normal;
}
s.pc = s.lastpc;
GenOp_1(s, data.insn, dst);
break;
case OpCode.LoadI:
case OpCode.GetGV:
case OpCode.GetIV:
case OpCode.GetCV:
case OpCode.GetConst:
case OpCode.String:
case OpCode.Lambda:
case OpCode.Block:
case OpCode.Method:
if (nopeep || data.a != src /*|| data.a < s.nlocals*/)
{
goto normal;
}
s.pc = s.lastpc;
GenOp_2(s, data.insn, dst, data.b);
break;
default:
goto normal;
}
}
return;
normal:
s.PushOP(new Instr(OpCode.Move, dst, src));
// TODO: on_eval
return;
}
