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better notes about some opcodes (comments only)

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This commit is contained in:
Roberto Ierusalimschy 2009-03-09 12:27:56 -03:00
parent 1817dfc301
commit f9d015523e
1 changed files with 16 additions and 11 deletions
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27
lopcodes.h
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@ -1,5 +1,5 @@
/*
** $Id: lopcodes.h,v 1.127 2008/04/02 16:16:06 roberto Exp roberto $
** $Id: lopcodes.h,v 1.128 2008/10/30 15:39:30 roberto Exp roberto $
** Opcodes for Lua virtual machine
** See Copyright Notice in lua.h
*/
@ -215,7 +215,7 @@ OP_TFORCALL,/* A C R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2)); */
OP_SETLIST,/* A B C R(A)[(C-1)*FPF+i] := R(A+i), 1 <= i <= B */
OP_CLOSE,/* A close all variables in the stack up to (>=) R(A)*/
OP_CLOSURE,/* A Bx R(A) := closure(KPROTO[Bx], R(A), ... ,R(A+n)) */
OP_CLOSURE,/* A Bx R(A) := closure(KPROTO[Bx]) */
OP_VARARG,/* A B R(A), R(A+1), ..., R(A+B-1) = vararg */
@ -231,22 +231,27 @@ OP_EXTRAARG/* Ax extra argument for previous opcode */
/*===========================================================================
Notes:
(*) In OP_CALL, if (B == 0) then B = top. C is the number of returns - 1,
and can be 0: OP_CALL then sets `top' to last_result+1, so
next open instruction (OP_CALL, OP_RETURN, OP_SETLIST) may use `top'.
(*) In OP_CALL, if (B == 0) then B = top. If (C == 0), then `top' is
set to last_result+1, so next open instruction (OP_CALL, OP_RETURN,
OP_SETLIST) may use `top'.
(*) In OP_VARARG, if (B == 0) then use actual number of varargs and
set top (like in OP_CALL with C == 0).
set top (like in OP_CALL with C == 0).
(*) In OP_RETURN, if (B == 0) then return up to `top'
(*) In OP_RETURN, if (B == 0) then return up to `top'.
(*) In OP_SETLIST, if (B == 0) then B = `top';
if (C == 0) then next `instruction' is EXTRAARG(real C)
(*) In OP_SETLIST, if (B == 0) then B = `top'; if (C == 0) then next
`instruction' is EXTRAARG(real C).
(*) For comparisons, A specifies what condition the test should accept
(true or false).
(true or false).
(*) All `skips' (pc++) assume that next instruction is a jump.
(*) The OP_CLOSURE instruction is followed by a sequence of
instructions coding the upvalues: OP_MOVE A B if upvalue is local B,
or OP_GETUPVAL A B if upvalue is enclosing upvalue B.
(*) All `skips' (pc++) assume that next instruction is a jump
===========================================================================*/