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Add USDT probe publishing ABI offsets for external profilers. #260

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Add USDT probe publishing ABI offsets for external profilers. #260

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13 changes: 13 additions & 0 deletions src/lj_state.c
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,9 @@
#include "lj_lex.h"
#include "lj_alloc.h"
#include "luajit.h"
#ifdef LUAJIT_USE_SDT
#include <sys/sdt.h>
#endif

/* -- Stack handling ------------------------------------------------------ */

Expand Down Expand Up @@ -303,6 +306,16 @@ LUA_API lua_State *lua_newstate(lua_Alloc allocf, void *allocd)
g->gc.pause = LUAI_GCPAUSE;
g->gc.stepmul = LUAI_GCMUL;
lj_dispatch_init((GG_State *)L);
#if defined(LUAJIT_USE_SDT) && LJ_HASJIT
/* Static ABI-offset note read by external profilers (e.g. otel-ebpf-profiler).
** Arg order is load-bearing: extend by appending a new probe name
** (e.g. luajit:offsets_v2), never by reordering this one. */
STAP_PROBE4(luajit, offsets,
(int)offsetof(global_State, cur_L),
GG_G2DISP,
GG_G2J + (int)offsetof(jit_State, trace),
CFRAME_SIZE_JIT);
#endif
L->status = LUA_ERRERR+1; /* Avoid touching the stack upon memory error. */
if (lj_vm_cpcall(L, NULL, NULL, cpluaopen) != 0) {
/* Memory allocation error: free partial state. */
Expand Down