private IP5Any Caller(bool noarg, int level, Opcode.ContextValues cxt)
{
if (level >= CallStack.Count)
{
if (cxt == Opcode.ContextValues.SCALAR)
return new P5Scalar(this);
else
return new P5List(this);
}
StackFrame frame;
if (level == 0)
frame = CallStack.Peek();
else
{
frame = new StackFrame();
foreach (var f in CallStack)
{
frame = f;
if (level == 0)
break;
--level;
}
}
if (cxt == Opcode.ContextValues.SCALAR)
return new P5Scalar(this, frame.Package);
else if (noarg)
return new P5List(
this,
new P5Scalar(this, frame.Package),
new P5Scalar(this, frame.File),
new P5Scalar(this, frame.Line));
else
{
var callcxt =
frame.Context == Opcode.ContextValues.VOID ? new P5Scalar(this) :
frame.Context == Opcode.ContextValues.SCALAR ? new P5Scalar(this, "") :
new P5Scalar(this, 1);
var subname = frame.Code != null ?
new P5Scalar(this, frame.Code.Name) : new P5Scalar(this);
return new P5List(
this,
new P5Scalar(this, frame.Package),
new P5Scalar(this, frame.File),
new P5Scalar(this, frame.Line),
subname,
new P5Scalar(this), // hasargs
callcxt, // context
new P5Scalar(this), // evaltext
new P5Scalar(this), // is_require
new P5Scalar(this), // hints
new P5Scalar(this)); // warnings
}
}
public virtual IP5Any Call(Runtime runtime, Opcode.ContextValues context,
P5Array args)
{
// TODO emit this in the subroutine prologue/epilogue code,
// as is done for eval BLOCK
P5ScratchPad pad = scratchpad;
if (scratchpad != null && !is_main)
pad = scratchpad.NewScope(runtime);
int size = runtime.CallStack.Count;
try
{
runtime.CallStack.Push(new StackFrame(runtime.Package,
runtime.File,
runtime.Line, this,
context, false));
return subref(runtime, context, pad, args);
}
finally
{
StackFrame frame = new StackFrame();
// the while() is required for tail calls,
// until proper tail calls are implemented
while (runtime.CallStack.Count > size)
frame = runtime.CallStack.Pop();
if (size > 0)
{
runtime.Package = frame.Package;
runtime.File = frame.File;
runtime.Line = frame.Line;
}
}
}
