4 files changed, 47 insertions, 6 deletions

diff --git a/src/lj_crecord.c b/src/lj_crecord.c
index b0de5423..aa4c5842 100644
--- a/src/lj_crecord.c
+++ b/src/lj_crecord.c
@@ -1913,6 +1913,15 @@ void LJ_FASTCALL lj_crecord_tonumber(jit_State *J, RecordFFData *rd)
   }
 }
 
+TRef lj_crecord_loadiu64(jit_State *J, TRef tr, cTValue *o)
+{
+  CTypeID id = argv2cdata(J, tr, o)->ctypeid;
+  if (!(id == CTID_INT64 || id == CTID_UINT64))
+    lj_trace_err(J, LJ_TRERR_BADTYPE);
+  return emitir(IRT(IR_FLOAD, id == CTID_INT64 ? IRT_I64 : IRT_U64), tr,
+                IRFL_CDATA_INT64);
+}
+
 #undef IR
 #undef emitir
 #undef emitconv
diff --git a/src/lj_crecord.h b/src/lj_crecord.h
index c6f39a67..1a3427bd 100644
--- a/src/lj_crecord.h
+++ b/src/lj_crecord.h
@@ -33,6 +33,7 @@ LJ_FUNC int LJ_FASTCALL recff_bit64_shift(jit_State *J, RecordFFData *rd);
 LJ_FUNC TRef recff_bit64_tohex(jit_State *J, RecordFFData *rd, TRef hdr);
 
 LJ_FUNC void LJ_FASTCALL lj_crecord_tonumber(jit_State *J, RecordFFData *rd);
+LJ_FUNC TRef lj_crecord_loadiu64(jit_State *J, TRef tr, cTValue *o);
 #endif
 
 #endif
diff --git a/src/lj_ffrecord.c b/src/lj_ffrecord.c
index 844fc497..d050d12d 100644
--- a/src/lj_ffrecord.c
+++ b/src/lj_ffrecord.c
@@ -961,8 +961,17 @@ static void LJ_FASTCALL recff_string_format(jit_State *J, RecordFFData *rd)
     case STRFMT_INT:
       id = IRCALL_lj_strfmt_putfnum_int;
     handle_int:
-      if (!tref_isinteger(tra))
+      if (!tref_isinteger(tra)) {
+#if LJ_HASFFI
+        if (tref_iscdata(tra)) {
+          tra = lj_crecord_loadiu64(J, tra, &rd->argv[arg-1]);
+          tr = lj_ir_call(J, IRCALL_lj_strfmt_putfxint, tr, trsf, tra);
+          lj_needsplit(J);
+          break;
+        }
+#endif
         goto handle_num;
+      }
       if (sf == STRFMT_INT) { /* Shortcut for plain %d. */
         tr = emitir(IRTG(IR_BUFPUT, IRT_PGC), tr,
                     emitir(IRT(IR_TOSTR, IRT_STR), tra, IRTOSTR_INT));
diff --git a/src/lj_strfmt.c b/src/lj_strfmt.c
index 5826b539..7b073470 100644
--- a/src/lj_strfmt.c
+++ b/src/lj_strfmt.c
@@ -16,6 +16,9 @@
 #include "lj_state.h"
 #include "lj_char.h"
 #include "lj_strfmt.h"
+#if LJ_HASFFI
+#include "lj_ctype.h"
+#endif
 #include "lj_lib.h"
 
 /* -- Format parser ------------------------------------------------------- */
@@ -392,15 +395,34 @@ int lj_strfmt_putarg(lua_State *L, SBuf *sb, int arg, int retry)
             lj_strfmt_putint(sb, k);  /* Shortcut for plain %d. */
           else
             lj_strfmt_putfxint(sb, sf, k);
-        } else {
-          lj_strfmt_putfnum_int(sb, sf, lj_lib_checknum(L, arg));
+          break;
+        }
+#if LJ_HASFFI
+        if (tviscdata(o)) {
+          GCcdata *cd = cdataV(o);
+          if (cd->ctypeid == CTID_INT64 || cd->ctypeid == CTID_UINT64) {
+            lj_strfmt_putfxint(sb, sf, *(uint64_t *)cdataptr(cd));
+            break;
+          }
         }
+#endif
+        lj_strfmt_putfnum_int(sb, sf, lj_lib_checknum(L, arg));
         break;
       case STRFMT_UINT:
-        if (tvisint(o))
+        if (tvisint(o)) {
           lj_strfmt_putfxint(sb, sf, intV(o));
-        else
-          lj_strfmt_putfnum_uint(sb, sf, lj_lib_checknum(L, arg));
+          break;
+        }
+#if LJ_HASFFI
+        if (tviscdata(o)) {
+          GCcdata *cd = cdataV(o);
+          if (cd->ctypeid == CTID_INT64 || cd->ctypeid == CTID_UINT64) {
+            lj_strfmt_putfxint(sb, sf, *(uint64_t *)cdataptr(cd));
+            break;
+          }
+        }
+#endif
+        lj_strfmt_putfnum_uint(sb, sf, lj_lib_checknum(L, arg));
         break;
       case STRFMT_NUM:
         lj_strfmt_putfnum(sb, sf, lj_lib_checknum(L, arg));