Support MacOS for running MMTk Ruby binding

Author: dugiahuy

mmtk_support.c

@@ -214,6 +214,18 @@ rb_mmtk_system_physical_memory(void)
         rb_bug("failed to get system physical memory size");
     }
     return (size_t) physical_pages * (size_t) page_size;
+#elif __APPLE__
+    #include <sys/sysctl.h>
+    int mib[2];
+    mib[0] = CTL_HW;
+    mib[1] = HW_MEMSIZE; // total physical memory
+    int64_t physical_memory;
+    size_t length = sizeof(int64_t);
+    if (sysctl(mib, 2, &physical_memory, &length, NULL, 0) == -1)
+    {
+        rb_bug("failed to get system physical memory size");
+    }
+    return (size_t) physical_memory;
 #else
 #error no implementation of rb_mmtk_system_physical_memory on this platform
 #endif

string.c

@@ -419,6 +419,7 @@ rb_str_make_embedded(VALUE str)
     TERM_FILL(RSTRING(str)->as.embed.ary + len, TERM_LEN(str));
 }
 
+void
 rb_debug_rstring_null_ptr(const char *func)
 {
     fprintf(stderr, "%s is returning NULL!! "

tool/m4/mmtk_ruby.m4

@@ -2,6 +2,7 @@ dnl -*- Autoconf -*-
 AC_DEFUN([MMTK_RUBY], [
 
 [MMTK_RUBY_SO_NAME=libmmtk_ruby.so]
+[MMTK_RUBY_DYLIB_NAME=libmmtk_ruby.dylib]
 
 AC_ARG_WITH(mmtk-ruby,
     AS_HELP_STRING([--with-mmtk-ruby=DIR],
@@ -28,10 +29,10 @@ AS_IF([test -n "$with_mmtk_ruby"], [
     AC_MSG_RESULT([yes])
 
     AS_IF([test -n "$with_mmtk_ruby_so"], [
-        AC_MSG_NOTICE([User specified the path to $MMTK_RUBY_SO_NAME: $with_mmtk_ruby_so])
+        AC_MSG_NOTICE([User specified the path to $MMTK_RUBY_SO_NAME or $MMTK_RUBY_DYLIB_NAME: $with_mmtk_ruby_so])
         mmtk_ruby_so_basename=$(basename $with_mmtk_ruby_so)
-        AS_IF([test "x$mmtk_ruby_so_basename" != "x$MMTK_RUBY_SO_NAME"],[
-            AC_MSG_ERROR([The base name must be $MMTK_RUBY_SO_NAME  Found: $mmtk_ruby_so_basename])
+        AS_IF([test "x$mmtk_ruby_so_basename" != "x$MMTK_RUBY_SO_NAME" -a "x$mmtk_ruby_so_basename" != "x$MMTK_RUBY_DYLIB_NAME"],[
+            AC_MSG_ERROR([The base name must be $MMTK_RUBY_SO_NAME or $MMTK_RUBY_DYLIB_NAME. Found: $mmtk_ruby_so_basename])
         ])
         mmtk_ruby_so_path="$with_mmtk_ruby_so"
         mmtk_ruby_build_suggestion="Please build it first"