[Tarantool-patches] [PATCH luajit] sysprof: disable proto and trace dumps in default

[Maxim Kokryashkin]

There is no need to dump proto or trace information for sysprof
in the default mode. Moreover, attempts to do so will lead to
segmentation fault due to uninitialized buffer. This commit
disables proto and trace dumps in the default mode.

Resolves tarantool/tarantool#7264
---
PR: https://github.com/tarantool/tarantool/pull/7265
Branch: https://github.com/tarantool/luajit/tree/fckxorg/gh-7264-dump-proto-default-mode

 src/lj_sysprof.c                              |  4 +-
 ...4-add-proto-trace-sysprof-default.test.lua | 58 +++++++++++++++++++
 2 files changed, 60 insertions(+), 2 deletions(-)
 create mode 100644 test/tarantool-tests/gh-7264-add-proto-trace-sysprof-default.test.lua

diff --git a/src/lj_sysprof.c b/src/lj_sysprof.c
index a4a70146..2e9ed9b3 100644
--- a/src/lj_sysprof.c
+++ b/src/lj_sysprof.c
@@ -524,7 +524,7 @@ void lj_sysprof_add_proto(const struct GCproto *pt)
 {
   struct sysprof *sp = &sysprof;
 
-  if (sp->state != SPS_PROFILE)
+  if (sp->state != SPS_PROFILE || sp->opt.mode == LUAM_SYSPROF_DEFAULT)
     return;
 
   /*
@@ -543,7 +543,7 @@ void lj_sysprof_add_trace(const struct GCtrace *tr)
 {
   struct sysprof *sp = &sysprof;
 
-  if (sp->state != SPS_PROFILE)
+  if (sp->state != SPS_PROFILE || sp->opt.mode == LUAM_SYSPROF_DEFAULT)
     return;
 
   /* See the comment about the sysprof state above. */
diff --git a/test/tarantool-tests/gh-7264-add-proto-trace-sysprof-default.test.lua b/test/tarantool-tests/gh-7264-add-proto-trace-sysprof-default.test.lua
new file mode 100644
index 00000000..2d2a756a
--- /dev/null
+++ b/test/tarantool-tests/gh-7264-add-proto-trace-sysprof-default.test.lua
@@ -0,0 +1,58 @@
+-- Sysprof is implemented for x86 and x64 architectures only.
+local ffi = require("ffi")
+require("utils").skipcond(
+  jit.arch ~= "x86" and jit.arch ~= "x64" or jit.os ~= "Linux"
+    or ffi.abi("gc64"),
+  jit.arch.." architecture or "..jit.os..
+  " OS is NIY for sysprof"
+)
+
+local tap = require("tap")
+local jit = require("jit")
+
+local test = tap.test("gh-7264-add-proto-trace-sysprof-default.test.lua")
+test:plan(2)
+
+jit.off()
+jit.flush()
+
+local function allocate()
+  local a = {}
+  for _ = 1, 1e4 do table.insert(a, "teststring") end
+  return a
+end
+
+local chunk = [[
+function lua_global_f()
+  local a = 'teststring'
+end
+]]
+
+-- Trace creation during the sysprof runtime.
+jit.on()
+
+local _ = nil
+local res, err = misc.sysprof.start({ mode = "D" })
+assert(res, err)
+allocate()
+res, _ = misc.sysprof.stop()
+test:ok(res)
+
+jit.off()
+
+-- Proto creation during the sysprof runtime.
+res, err = misc.sysprof.start({ mode = "D" })
+assert(res, err)
+
+res, err = loadstring(chunk)
+assert(res, err)
+res()
+
+-- luacheck: globals lua_global_f
+lua_global_f()
+collectgarbage()
+res, _ = misc.sysprof.stop()
+test:ok(res)
+
+jit.on()
+os.exit(test:check() and 0 or 1)
-- 
2.36.1