More uniformity in code generation for 'for' loops

Added new instruction 'OP_TFORPREP' to prepare a generic for loop.
Currently it is equivalent to a jump (but with a format 'iABx',
similar to other for-loop preparing instructions), but soon it will
be the place to create upvalues for closing loop states.

1 files changed, 1 insertions, 0 deletions

diff --git a/lopcodes.h b/lopcodes.h
index 4d144000..4797d7c3 100644
--- a/lopcodes.h
+++ b/lopcodes.h
@@ -282,6 +282,7 @@ OP_FORLOOP,/*	A Bx	R(A)+=R(A+2);
                         if R(A) <?= R(A+1) then { pc-=Bx; R(A+3)=R(A) } */
 OP_FORPREP,/*   A Bx    R(A)-=R(A+2); pc+=Bx                            */
 
+OP_TFORPREP,/*  A Bx    create upvalue A; pc+=Bx                        */
 OP_TFORCALL,/*  A C     R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2));  */
 OP_TFORLOOP,/*  A Bx    if R(A+1) ~= nil then { R(A)=R(A+1); pc -= Bx } */