Move helper for syncing data/instruction cache to lj_mcode.c.

Sync caches after dynamic code generation for FFI callbacks.

src/lj_mcode.c

@@ -7,18 +7,65 @@
 #define LUA_CORE
 
 #include "lj_obj.h"
-
 #if LJ_HASJIT
-
 #include "lj_gc.h"
 #include "lj_jit.h"
 #include "lj_mcode.h"
 #include "lj_trace.h"
 #include "lj_dispatch.h"
 #include "lj_vm.h"
+#endif
 
 /* -- OS-specific functions ----------------------------------------------- */
 
+#if LJ_HASJIT || LJ_HASFFI
+
+/* Define this if you want to run LuaJIT with Valgrind. */
+#ifdef LUAJIT_USE_VALGRIND
+#include <valgrind/valgrind.h>
+#endif
+
+#if !LJ_TARGET_X86ORX64 && LJ_TARGET_OSX
+void sys_icache_invalidate(void *start, size_t len);
+#endif
+
+#if LJ_TARGET_LINUX && LJ_TARGET_PPC
+#include <dlfcn.h>
+static void (*mcode_sync_ppc)(void *start, void *end);
+static void mcode_sync_dummy(void *start, void *end)
+{
+    UNUSED(start); UNUSED(end);
+}
+#endif
+
+/* Synchronize data/instruction cache. */
+void lj_mcode_sync(void *start, void *end)
+{
+#ifdef LUAJIT_USE_VALGRIND
+  VALGRIND_DISCARD_TRANSLATIONS(start, (char *)end-(char *)start);
+#endif
+#if LJ_TARGET_X86ORX64
+  UNUSED(start); UNUSED(end);
+#elif LJ_TARGET_OSX
+  sys_icache_invalidate(start, (char *)end-(char *)start);
+#elif LJ_TARGET_LINUX && LJ_TARGET_PPC
+  if (!mcode_sync_ppc) {
+    void *vdso = dlopen("linux-vdso32.so.1", RTLD_LAZY);
+    if (!vdso || !(mcode_sync_ppc = dlsym(vdso, "__kernel_sync_dicache")))
+      mcode_sync_ppc = mcode_sync_dummy;
+  }
+  mcode_sync_ppc(start, end);
+#elif defined(__GNUC__) && !LJ_TARGET_PPC
+  __clear_cache(start, end);
+#else
+#error "Missing builtin to flush instruction cache"
+#endif
+}
+
+#endif
+
+#if LJ_HASJIT
+
 #if LJ_TARGET_WINDOWS
 
 #define WIN32_LEAN_AND_MEAN