Remove LUAJIT_USE_PERFTOOLS

This feature is not justified.

src/lj_trace.c

@@ -82,41 +82,6 @@ static TraceNo trace_findfree(jit_State *J)
   memcpy(p, J->cur.field, J->cur.szfield*sizeof(tp)); \
   p += J->cur.szfield*sizeof(tp);
 
-#ifdef LUAJIT_USE_PERFTOOLS
-/*
-** Create symbol table of JIT-compiled code. For use with Linux perf tools.
-** Example usage:
-**   perf record -f -e cycles luajit test.lua
-**   perf report -s symbol
-**   rm perf.data /tmp/perf-*.map
-*/
-#include <stdio.h>
-#include <unistd.h>
-
-static void perftools_addtrace(GCtrace *T)
-{
-  static FILE *fp;
-  GCproto *pt = &gcref(T->startpt)->pt;
-  const BCIns *startpc = mref(T->startpc, const BCIns);
-  const char *name = proto_chunknamestr(pt);
-  BCLine lineno;
-  if (name[0] == '@' || name[0] == '=')
-    name++;
-  else
-    name = "(string)";
-  lua_assert(startpc >= proto_bc(pt) && startpc < proto_bc(pt) + pt->sizebc);
-  lineno = lj_debug_line(pt, proto_bcpos(pt, startpc));
-  if (!fp) {
-    char fname[40];
-    sprintf(fname, "/tmp/perf-%d.map", getpid());
-    if (!(fp = fopen(fname, "w"))) return;
-    setlinebuf(fp);
-  }
-  fprintf(fp, "%lx %x TRACE_%d::%s:%u\n",
-	  (long)T->mcode, T->szmcode, T->traceno, name, lineno);
-}
-#endif
-
 /* Allocate space for copy of T. */
 GCtrace * LJ_FASTCALL lj_trace_alloc(lua_State *L, GCtrace *T)
 {
@@ -159,9 +124,6 @@ static void trace_save(jit_State *J, GCtrace *T)
   setgcrefp(J->trace[T->traceno], T);
   lj_gc_barriertrace(J2G(J), T->traceno);
   lj_gdbjit_addtrace(J, T);
-#ifdef LUAJIT_USE_PERFTOOLS
-  perftools_addtrace(T);
-#endif
 }
 
 void LJ_FASTCALL lj_trace_free(global_State *g, GCtrace *T)