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Clearer code for controlling maximum registers

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Plus, added a test to check that limit.
This commit is contained in:
Roberto Ierusalimschy
2024-06-26 14:46:44 -03:00
parent c1dc08e8e8
commit fb7e5b76c9
3 changed files with 28 additions and 10 deletions
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17
lopcodes.h
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@@ -23,9 +23,9 @@ iAsBx sBx (signed)(17) | A(8) | Op(7) |
iAx Ax(25) | Op(7) |
isJ sJ (signed)(25) | Op(7) |
A signed argument is represented in excess K: the represented value is
the written unsigned value minus K, where K is half the maximum for the
corresponding unsigned argument.
A signed argument is represented in excess K: The represented value is
the written unsigned value minus K, where K is half (rounded down) the
maximum value for the corresponding unsigned argument.
===========================================================================*/
@@ -177,9 +177,16 @@ enum OpMode {iABC, iABx, iAsBx, iAx, isJ}; /* basic instruction formats */
/*
** invalid register that fits in 8 bits
** Maximum size for the stack of a Lua function. It must fit in 8 bits.
** The highest valid register is one less than this value.
*/
#define NO_REG MAXARG_A
#define MAX_FSTACK MAXARG_A
/*
** Invalid register (one more than last valid register).
*/
#define NO_REG MAX_FSTACK
/*