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To-be-closed variable in 'for' loop separated from the state

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The variable to be closed in a generic 'for' loop now is the
4th value produced in the loop initialization, instead of being
the loop state (the 2nd value produced). That allows a loop to
use a state with a '__toclose' metamethod but do not close it.
(As an example, 'f:lines()' might use the file 'f' as a state
for the loop, but it should not close the file when the loop ends.)
This commit is contained in:
Roberto Ierusalimschy
2018-11-07 14:42:05 -02:00
parent b8fed93215
commit 7f6f70853c
6 changed files with 76 additions and 29 deletions
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6
lopcodes.h
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@@ -279,9 +279,9 @@ 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 } */
OP_TFORPREP,/* A Bx create upvalue for R(A + 3); pc+=Bx */
OP_TFORCALL,/* A C R(A+4), ... ,R(A+3+C) := R(A)(R(A+1), R(A+2)); */
OP_TFORLOOP,/* A Bx if R(A+2) ~= nil then { R(A)=R(A+2); pc -= Bx } */
OP_SETLIST,/* A B C R(A)[(C-1)*FPF+i] := R(A+i), 1 <= i <= B */