Fast forward to sync public repo.

Compile math.sinh(), math.cosh(), math.tanh() and math.random().
Compile various io.*() functions.
Drive the GC forward on string allocations in the parser.
Improve KNUM fuse vs. load heuristics.
Add abstract C call handling to IR.

src/lj_ir.c

@@ -6,16 +6,22 @@
 #define lj_ir_c
 #define LUA_CORE
 
+/* For pointers to libc/libm functions. */
+#include <stdio.h>
+#include <math.h>
+
 #include "lj_obj.h"
 
 #if LJ_HASJIT
 
 #include "lj_gc.h"
 #include "lj_str.h"
+#include "lj_tab.h"
 #include "lj_ir.h"
 #include "lj_jit.h"
 #include "lj_iropt.h"
 #include "lj_trace.h"
+#include "lj_lib.h"
 
 /* Some local macros to save typing. Undef'd at the end. */
 #define IR(ref)			(&J->cur.ir[(ref)])
@@ -32,6 +38,17 @@ IRDEF(IRMODE)
   0
 };
 
+/* C call info for CALL* instructions. */
+LJ_DATADEF const CCallInfo lj_ir_callinfo[] = {
+#define IRCALLCI(name, nargs, kind, type, flags) \
+  { (ASMFunction)name, \
+    (nargs)|(CCI_CALL_##kind)|(IRT_##type<<CCI_OTSHIFT)|(flags) },
+IRCALLDEF(IRCALLCI)
+#undef IRCALLCI
+  { NULL, 0 }
+};
+
+
 /* -- IR emitter ---------------------------------------------------------- */
 
 /* Grow IR buffer at the top. */
@@ -92,6 +109,25 @@ TRef LJ_FASTCALL lj_ir_emit(jit_State *J)
   return TREF(ref, irt_t((ir->t = fins->t)));
 }
 
+/* Emit call to a C function. */
+TRef lj_ir_call(jit_State *J, IRCallID id, ...)
+{
+  const CCallInfo *ci = &lj_ir_callinfo[id];
+  uint32_t n = CCI_NARGS(ci);
+  TRef tr = TREF_NIL;
+  va_list argp;
+  va_start(argp, id);
+  if ((ci->flags & CCI_L)) n--;
+  if (n > 0)
+    tr = va_arg(argp, IRRef);
+  while (n-- > 1)
+    tr = emitir(IRT(IR_CARG, IRT_NIL), tr, va_arg(argp, IRRef));
+  va_end(argp);
+  if (CCI_OP(ci) == IR_CALLS)
+    J->needsnap = 1;  /* Need snapshot after call with side effect. */
+  return emitir(CCI_OPTYPE(ci), tr, id);
+}
+
 /* -- Interning of constants ---------------------------------------------- */
 
 /*