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Allow negative alignment offsets (#1255)

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This commit is contained in:
Rangi
2023-11-25 03:40:20 -05:00
committed by GitHub
parent 756f2866bb
commit 2ebd7f2ea3
4 changed files with 18 additions and 6 deletions
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11
src/asm/parser.y
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@@ -1026,15 +1026,16 @@ align_spec : uconst {
$$.alignOfs = 0;
}
}
| uconst T_COMMA uconst {
| uconst T_COMMA const {
if ($1 > 16) {
error("Alignment must be between 0 and 16, not %u\n", $1);
} else if ($3 >= 1 << $1) {
error("Alignment offset (%u) must be smaller than alignment size (%u)\n",
$3, 1 << $1);
} else if ($3 <= -(1 << $1) || $3 >= 1 << $1) {
error("The absolute alignment offset (%" PRIu32
") must be less than alignment size (%d)\n",
(uint32_t)($3 < 0 ? -$3 : $3), 1 << $1);
} else {
$$.alignment = $1;
$$.alignOfs = $3;
$$.alignOfs = $3 < 0 ? (1 << $1) + $3 : $3;
}
}
;