misc: introduce flags with profiler support status

The patch introduce flags in module "misc" with support status
for sysprof and memprof: `misc.sysprof.available` and
`misc.memprof.available`. Both flags are boolean and always
available on platforms supported by profilers (Windows is not
supported).

Resolves tarantool/tarantool#12215

Author: ligurio

src/lib_misc.c

@@ -389,6 +389,8 @@ LJLIB_CF(misc_sysprof_report)
 #endif /* !LJ_HASSYSPROF */
 }
 
+LJLIB_PUSH(top-2) LJLIB_SET(available)
+
 /* ----- misc.memprof module ---------------------------------------------- */
 
 #define LJLIB_MODULE_misc_memprof
@@ -459,6 +461,8 @@ LJLIB_CF(misc_memprof_stop)
 }
 #endif /* !LJ_TARGET_WINDOWS */
 
+LJLIB_PUSH(top-2) LJLIB_SET(available)
+
 #include "lj_libdef.h"
 
 /* ------------------------------------------------------------------------ */
@@ -477,7 +481,9 @@ LUALIB_API int luaopen_misc(struct lua_State *L)
 
   LJ_LIB_REG(L, LUAM_MISCLIBNAME, misc);
 #if !LJ_TARGET_WINDOWS
+  lua_pushboolean(L, LJ_HASMEMPROF);
   LJ_LIB_REG(L, LUAM_MISCLIBNAME ".memprof", misc_memprof);
+  lua_pushboolean(L, LJ_HASSYSPROF);
   LJ_LIB_REG(L, LUAM_MISCLIBNAME ".sysprof", misc_sysprof);
 #endif /* !LJ_TARGET_WINDOWS */
   return 1;

test/tarantool-tests/profilers/misclib-memprof-lapi-disabled.test.lua

@@ -3,7 +3,7 @@ local test = tap.test('misclib-memprof-lapi-disabled'):skipcond({
   ['Memprof is enabled'] = not os.getenv('LUAJIT_DISABLE_MEMPROF'),
 })
 
-test:plan(6)
+test:plan(8)
 
 -- Attempt to start memprof when it is disabled.
 local res, err, errno = misc.memprof.start()
@@ -19,4 +19,8 @@ test:ok(err:match('profiler is disabled'),
         'error on stop when memprof is disabled')
 test:ok(type(errno) == 'number', 'errno on start when memprof is disabled')
 
+test:ok(type(misc.memprof.available) == 'boolean',
+        'misc.memprof.available exists')
+test:ok(misc.memprof.available == false, 'misc.memprof.available is false')
+
 test:done(true)

test/tarantool-tests/profilers/misclib-memprof-lapi.test.lua

@@ -11,7 +11,7 @@ local test = tap.test("misclib-memprof-lapi"):skipcond({
   ["Memprof is disabled"] = os.getenv("LUAJIT_DISABLE_MEMPROF"),
 })
 
-test:plan(5)
+test:plan(7)
 
 local jit_opt_default = {
     3, -- level
@@ -270,4 +270,8 @@ test:test("jit-output", function(subtest)
   jit.opt.start(unpack(jit_opt_default))
 end)
 
+test:ok(type(misc.memprof.available) == 'boolean',
+        'misc.memprof.available exists')
+test:ok(misc.memprof.available == true, 'misc.memprof.available is true')
+
 test:done(true)

test/tarantool-tests/profilers/misclib-sysprof-lapi-disabled.test.lua

@@ -3,7 +3,7 @@ local test = tap.test('misclib-sysprof-lapi-disabled'):skipcond({
   ['Sysprof is enabled'] = not os.getenv('LUAJIT_DISABLE_SYSPROF'),
 })
 
-test:plan(9)
+test:plan(11)
 
 -- Attempt to start sysprof when sysprof is disabled.
 local res, err, errno = misc.sysprof.start()
@@ -26,4 +26,8 @@ test:ok(err:match('profiler is disabled'),
         'error on stop when sysprof is disabled')
 test:ok(type(errno) == 'number', 'errno on start when sysprof is disabled')
 
+test:ok(type(misc.sysprof.available) == 'boolean',
+        'misc.sysprof.available exists')
+test:ok(misc.sysprof.available == false, 'misc.sysprof.available is false')
+
 test:done(true)

test/tarantool-tests/profilers/misclib-sysprof-lapi.test.lua

@@ -10,7 +10,7 @@ local test = tap.test("misclib-sysprof-lapi"):skipcond({
   ["Disabled due to #10803"] = os.getenv("LUAJIT_TEST_USE_VALGRIND"),
 })
 
-test:plan(45)
+test:plan(47)
 
 jit.off()
 -- XXX: Run JIT tuning functions in a safe frame to avoid errors
@@ -228,4 +228,8 @@ check_mode("C", 100)
 
 os.remove(TMP_BINFILE)
 
+test:ok(type(misc.sysprof.available) == 'boolean',
+        'misc.sysprof.available exists')
+test:ok(misc.sysprof.available == true, 'misc.sysprof.available is true')
+
 test:done(true)