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MINOR: lua: all functions calling lua_yieldk() may return

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There was a mistake when tagging functions which always use longjmp and
those which may use it in that all those supposed to call lua_yieldk()
may return without calling longjmp. Thus they must not use WILL_LJMP()
but MAY_LJMP(). It has zero impact on the code emitted as such, but
prevents other fixes from being properly implemented : this was the
cause of the previous failure with the __unreachable() calls.

This may be backported to older versions. It may or may not apply
well depending on the context, though the change simply consists in
replacing "WILL_LJMP(hlua_yieldk" with "MAY_LJMP(hlua_yieldk", and
same with the single call to lua_yieldk() in hlua_yieldk().
This commit is contained in:
Willy Tarreau 2018-10-16 17:52:55 +02:00
parent e09101e8d9
commit 9635e03c41
1 changed files with 31 additions and 31 deletions
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62
src/hlua.c
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@ -869,7 +869,7 @@ __LJMP void hlua_yieldk(lua_State *L, int nresults, int ctx,
hlua->flags |= flags; hlua->flags |= flags;
/* Process the yield. */ /* Process the yield. */
WILL_LJMP(lua_yieldk(L, nresults, ctx, k)); MAY_LJMP(lua_yieldk(L, nresults, ctx, k));
} }
/* This function initialises the Lua environment stored in the stream. /* This function initialises the Lua environment stored in the stream.
@ -1020,7 +1020,7 @@ void hlua_hook(lua_State *L, lua_Debug *ar)
* If the state is not yieldable, trying yield causes an error. * If the state is not yieldable, trying yield causes an error.
*/ */
if (lua_isyieldable(L)) if (lua_isyieldable(L))
WILL_LJMP(hlua_yieldk(L, 0, 0, NULL, TICK_ETERNITY, HLUA_CTRLYIELD)); MAY_LJMP(hlua_yieldk(L, 0, 0, NULL, TICK_ETERNITY, HLUA_CTRLYIELD));
/* If we cannot yield, update the clock and check the timeout. */ /* If we cannot yield, update the clock and check the timeout. */
tv_update_date(0, 1); tv_update_date(0, 1);
@ -1883,7 +1883,7 @@ connection_empty:
WILL_LJMP(luaL_error(L, "out of memory")); WILL_LJMP(luaL_error(L, "out of memory"));
} }
xref_unlock(&socket->xref, peer); xref_unlock(&socket->xref, peer);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_receive_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_receive_yield, TICK_ETERNITY, 0));
return 0; return 0;
} }
@ -2082,7 +2082,7 @@ hlua_socket_write_yield_return:
WILL_LJMP(luaL_error(L, "out of memory")); WILL_LJMP(luaL_error(L, "out of memory"));
} }
xref_unlock(&socket->xref, peer); xref_unlock(&socket->xref, peer);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_write_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_write_yield, TICK_ETERNITY, 0));
return 0; return 0;
} }
@ -2375,7 +2375,7 @@ __LJMP static int hlua_socket_connect_yield(struct lua_State *L, int status, lua
WILL_LJMP(luaL_error(L, "out of memory error")); WILL_LJMP(luaL_error(L, "out of memory error"));
} }
xref_unlock(&socket->xref, peer); xref_unlock(&socket->xref, peer);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_connect_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_connect_yield, TICK_ETERNITY, 0));
return 0; return 0;
} }
@ -2493,7 +2493,7 @@ __LJMP static int hlua_socket_connect(struct lua_State *L)
task_wakeup(s->task, TASK_WOKEN_INIT); task_wakeup(s->task, TASK_WOKEN_INIT);
/* Return yield waiting for connection. */ /* Return yield waiting for connection. */
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_connect_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_socket_connect_yield, TICK_ETERNITY, 0));
return 0; return 0;
} }
@ -2829,7 +2829,7 @@ __LJMP static int hlua_channel_dup_yield(lua_State *L, int status, lua_KContext
chn = MAY_LJMP(hlua_checkchannel(L, 1)); chn = MAY_LJMP(hlua_checkchannel(L, 1));
if (_hlua_channel_dup(chn, L) == 0) if (_hlua_channel_dup(chn, L) == 0)
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_dup_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_dup_yield, TICK_ETERNITY, 0));
return 1; return 1;
} }
@ -2855,7 +2855,7 @@ __LJMP static int hlua_channel_get_yield(lua_State *L, int status, lua_KContext
ret = _hlua_channel_dup(chn, L); ret = _hlua_channel_dup(chn, L);
if (unlikely(ret == 0)) if (unlikely(ret == 0))
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_get_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_get_yield, TICK_ETERNITY, 0));
if (unlikely(ret == -1)) if (unlikely(ret == -1))
return 1; return 1;
@ -2893,7 +2893,7 @@ __LJMP static int hlua_channel_getline_yield(lua_State *L, int status, lua_KCont
ret = ci_getline_nc(chn, &blk1, &len1, &blk2, &len2); ret = ci_getline_nc(chn, &blk1, &len1, &blk2, &len2);
if (ret == 0) if (ret == 0)
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_getline_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_getline_yield, TICK_ETERNITY, 0));
if (ret == -1) { if (ret == -1) {
lua_pushnil(L); lua_pushnil(L);
@ -2942,7 +2942,7 @@ __LJMP static int hlua_channel_append_yield(lua_State *L, int status, lua_KConte
*/ */
if (chn->buf.size == 0) { if (chn->buf.size == 0) {
si_applet_cant_put(chn_prod(chn)); si_applet_cant_put(chn_prod(chn));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_append_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_append_yield, TICK_ETERNITY, 0));
} }
max = channel_recv_limit(chn) - b_data(&chn->buf); max = channel_recv_limit(chn) - b_data(&chn->buf);
@ -2956,7 +2956,7 @@ __LJMP static int hlua_channel_append_yield(lua_State *L, int status, lua_KConte
} }
if (ret == -1) { if (ret == -1) {
chn->flags |= CF_WAKE_WRITE; chn->flags |= CF_WAKE_WRITE;
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_append_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_append_yield, TICK_ETERNITY, 0));
} }
l += ret; l += ret;
lua_pop(L, 1); lua_pop(L, 1);
@ -2972,7 +2972,7 @@ __LJMP static int hlua_channel_append_yield(lua_State *L, int status, lua_KConte
return 1; return 1;
} }
if (l < len) if (l < len)
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_append_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_append_yield, TICK_ETERNITY, 0));
return 1; return 1;
} }
@ -3036,7 +3036,7 @@ __LJMP static int hlua_channel_send_yield(lua_State *L, int status, lua_KContext
*/ */
if (chn->buf.size == 0) { if (chn->buf.size == 0) {
si_applet_cant_put(chn_prod(chn)); si_applet_cant_put(chn_prod(chn));
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_send_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_send_yield, TICK_ETERNITY, 0));
} }
/* the writed data will be immediatly sent, so we can check /* the writed data will be immediatly sent, so we can check
@ -3092,7 +3092,7 @@ __LJMP static int hlua_channel_send_yield(lua_State *L, int status, lua_KContext
HLUA_SET_WAKERESWR(hlua); HLUA_SET_WAKERESWR(hlua);
else else
HLUA_SET_WAKEREQWR(hlua); HLUA_SET_WAKEREQWR(hlua);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_send_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_send_yield, TICK_ETERNITY, 0));
} }
return 1; return 1;
@ -3156,7 +3156,7 @@ __LJMP static int hlua_channel_forward_yield(lua_State *L, int status, lua_KCont
HLUA_SET_WAKEREQWR(hlua); HLUA_SET_WAKEREQWR(hlua);
/* Otherwise, we can yield waiting for new data in the inpout side. */ /* Otherwise, we can yield waiting for new data in the inpout side. */
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_forward_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_channel_forward_yield, TICK_ETERNITY, 0));
} }
return 1; return 1;
@ -3662,7 +3662,7 @@ __LJMP static int hlua_applet_tcp_getline_yield(lua_State *L, int status, lua_KC
/* Data not yet avalaible. return yield. */ /* Data not yet avalaible. return yield. */
if (ret == 0) { if (ret == 0) {
si_applet_cant_get(si); si_applet_cant_get(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_getline_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_getline_yield, TICK_ETERNITY, 0));
} }
/* End of data: commit the total strings and return. */ /* End of data: commit the total strings and return. */
@ -3717,7 +3717,7 @@ __LJMP static int hlua_applet_tcp_recv_yield(lua_State *L, int status, lua_KCont
/* Data not yet avalaible. return yield. */ /* Data not yet avalaible. return yield. */
if (ret == 0) { if (ret == 0) {
si_applet_cant_get(si); si_applet_cant_get(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0));
} }
/* End of data: commit the total strings and return. */ /* End of data: commit the total strings and return. */
@ -3740,7 +3740,7 @@ __LJMP static int hlua_applet_tcp_recv_yield(lua_State *L, int status, lua_KCont
luaL_addlstring(&appctx->b, blk2, len2); luaL_addlstring(&appctx->b, blk2, len2);
co_skip(si_oc(si), len1 + len2); co_skip(si_oc(si), len1 + len2);
si_applet_cant_get(si); si_applet_cant_get(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0));
} else { } else {
@ -3764,7 +3764,7 @@ __LJMP static int hlua_applet_tcp_recv_yield(lua_State *L, int status, lua_KCont
lua_pushinteger(L, len); lua_pushinteger(L, len);
lua_replace(L, 2); lua_replace(L, 2);
si_applet_cant_get(si); si_applet_cant_get(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_recv_yield, TICK_ETERNITY, 0));
} }
/* return the result. */ /* return the result. */
@ -3833,7 +3833,7 @@ __LJMP static int hlua_applet_tcp_send_yield(lua_State *L, int status, lua_KCont
*/ */
if (l < len) { if (l < len) {
si_applet_cant_put(si); si_applet_cant_put(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_send_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_tcp_send_yield, TICK_ETERNITY, 0));
} }
return 1; return 1;
@ -4130,7 +4130,7 @@ __LJMP static int hlua_applet_http_getline_yield(lua_State *L, int status, lua_K
*/ */
if (ret == -1) { if (ret == -1) {
si_applet_cant_put(si); si_applet_cant_put(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_getline_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_getline_yield, TICK_ETERNITY, 0));
} }
appctx->appctx->ctx.hlua_apphttp.flags &= ~APPLET_100C; appctx->appctx->ctx.hlua_apphttp.flags &= ~APPLET_100C;
} }
@ -4147,7 +4147,7 @@ __LJMP static int hlua_applet_http_getline_yield(lua_State *L, int status, lua_K
/* Data not yet avalaible. return yield. */ /* Data not yet avalaible. return yield. */
if (ret == 0) { if (ret == 0) {
si_applet_cant_get(si); si_applet_cant_get(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_getline_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_getline_yield, TICK_ETERNITY, 0));
} }
/* End of data: commit the total strings and return. */ /* End of data: commit the total strings and return. */
@ -4216,7 +4216,7 @@ __LJMP static int hlua_applet_http_recv_yield(lua_State *L, int status, lua_KCon
*/ */
if (ret == -1) { if (ret == -1) {
si_applet_cant_put(si); si_applet_cant_put(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_recv_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_recv_yield, TICK_ETERNITY, 0));
} }
appctx->appctx->ctx.hlua_apphttp.flags &= ~APPLET_100C; appctx->appctx->ctx.hlua_apphttp.flags &= ~APPLET_100C;
} }
@ -4227,7 +4227,7 @@ __LJMP static int hlua_applet_http_recv_yield(lua_State *L, int status, lua_KCon
/* Data not yet avalaible. return yield. */ /* Data not yet avalaible. return yield. */
if (ret == 0) { if (ret == 0) {
si_applet_cant_get(si); si_applet_cant_get(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_recv_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_recv_yield, TICK_ETERNITY, 0));
} }
/* End of data: commit the total strings and return. */ /* End of data: commit the total strings and return. */
@ -4262,7 +4262,7 @@ __LJMP static int hlua_applet_http_recv_yield(lua_State *L, int status, lua_KCon
lua_pushinteger(L, len); lua_pushinteger(L, len);
lua_replace(L, 2); lua_replace(L, 2);
si_applet_cant_get(si); si_applet_cant_get(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_recv_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_recv_yield, TICK_ETERNITY, 0));
} }
/* return the result. */ /* return the result. */
@ -4328,7 +4328,7 @@ __LJMP static int hlua_applet_http_send_yield(lua_State *L, int status, lua_KCon
*/ */
if (l < len) { if (l < len) {
si_applet_cant_put(si); si_applet_cant_put(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_send_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_send_yield, TICK_ETERNITY, 0));
} }
return 1; return 1;
@ -4468,7 +4468,7 @@ __LJMP static int hlua_applet_http_start_response_yield(lua_State *L, int status
/* If ret is -1, we dont have room in the buffer, so we yield. */ /* If ret is -1, we dont have room in the buffer, so we yield. */
if (ret == -1) { if (ret == -1) {
si_applet_cant_put(si); si_applet_cant_put(si);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_start_response_yield, TICK_ETERNITY, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_applet_http_start_response_yield, TICK_ETERNITY, 0));
} }
/* Headers sent, set the flag. */ /* Headers sent, set the flag. */
@ -5540,7 +5540,7 @@ __LJMP static int hlua_sleep_yield(lua_State *L, int status, lua_KContext ctx)
{ {
int wakeup_ms = lua_tointeger(L, -1); int wakeup_ms = lua_tointeger(L, -1);
if (now_ms < wakeup_ms) if (now_ms < wakeup_ms)
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_sleep_yield, wakeup_ms, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_sleep_yield, wakeup_ms, 0));
return 0; return 0;
} }
@ -5555,7 +5555,7 @@ __LJMP static int hlua_sleep(lua_State *L)
wakeup_ms = tick_add(now_ms, delay); wakeup_ms = tick_add(now_ms, delay);
lua_pushinteger(L, wakeup_ms); lua_pushinteger(L, wakeup_ms);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_sleep_yield, wakeup_ms, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_sleep_yield, wakeup_ms, 0));
return 0; return 0;
} }
@ -5570,7 +5570,7 @@ __LJMP static int hlua_msleep(lua_State *L)
wakeup_ms = tick_add(now_ms, delay); wakeup_ms = tick_add(now_ms, delay);
lua_pushinteger(L, wakeup_ms); lua_pushinteger(L, wakeup_ms);
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_sleep_yield, wakeup_ms, 0)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_sleep_yield, wakeup_ms, 0));
return 0; return 0;
} }
@ -5585,7 +5585,7 @@ __LJMP static int hlua_yield_yield(lua_State *L, int status, lua_KContext ctx)
__LJMP static int hlua_yield(lua_State *L) __LJMP static int hlua_yield(lua_State *L)
{ {
WILL_LJMP(hlua_yieldk(L, 0, 0, hlua_yield_yield, TICK_ETERNITY, HLUA_CTRLYIELD)); MAY_LJMP(hlua_yieldk(L, 0, 0, hlua_yield_yield, TICK_ETERNITY, HLUA_CTRLYIELD));
return 0; return 0;
} }