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BUILD: lua: silence some compiler warnings after WILL_LJMP

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These ones are on error paths that are properly handled by luaL_error()
which does a longjmp() but the compiler cannot know it. By adding an
__unreachable() statement in WILL_LJMP(), there is no ambiguity anymore.

This may be backported to 1.8 but these previous patches are needed first :
  - BUILD: compiler: add a new statement "__unreachable()"
  - MINOR: lua: all functions calling lua_yieldk() may return
  - BUILD: lua: silence some compiler warnings about potential null derefs (#2)
This commit is contained in:
Willy Tarreau 2018-10-16 17:57:36 +02:00
parent 9635e03c41
commit b059b894cd
1 changed files with 2 additions and 1 deletions
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3
src/hlua.c
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@ -25,6 +25,7 @@
#include <ebpttree.h>
#include <common/cfgparse.h>
#include <common/compiler.h>
#include <common/xref.h>
#include <common/hathreads.h>
@ -67,7 +68,7 @@
* MAY_LJMP() marks an lua function that may use longjmp.
*/
#define __LJMP
#define WILL_LJMP(func) func
#define WILL_LJMP(func) do { func; __unreachable(); } while(0)
#define MAY_LJMP(func) func
/* This couple of function executes securely some Lua calls outside of