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Add compile-time option LUAJIT_ENABLE_CHECKHOOK. Disabled by default.

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This checks for asynchronously set hooks from compiled code.
This commit is contained in:
Mike Pall 2011-01-19 02:05:37 +01:00
parent d20e53c322
commit 6bce6b118e
1 changed files with 21 additions and 0 deletions
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21
src/lj_record.c
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@ -2033,6 +2033,27 @@ void lj_record_setup(jit_State *J)
if (1 + J->pt->framesize >= LJ_MAX_JSLOTS)
lj_trace_err(J, LJ_TRERR_STACKOV);
}
#ifdef LUAJIT_ENABLE_CHECKHOOK
/* Regularly check for instruction/line hooks from compiled code and
** exit to the interpreter if the hooks are set.
**
** This is a compile-time option and disabled by default, since the
** hook checks may be quite expensive in tight loops.
**
** Note this is only useful if hooks are *not* set most of the time.
** Use this only if you want to *asynchronously* interrupt the execution.
**
** You can set the instruction hook via lua_sethook() with a count of 1
** from a signal handler or another native thread. Please have a look
** at the first few functions in luajit.c for an example (Ctrl-C handler).
*/
{
TRef tr = emitir(IRT(IR_XLOAD, IRT_U8),
lj_ir_kptr(J, &J2G(J)->hookmask), IRXLOAD_VOLATILE);
tr = emitir(IRTI(IR_BAND), tr, lj_ir_kint(J, (LUA_MASKLINE|LUA_MASKCOUNT)));
emitir(IRTGI(IR_EQ), tr, lj_ir_kint(J, 0));
}
#endif
}
#undef IR