snapshot

src/common.h

@@ -15,6 +15,8 @@
 #define MACRO_MakeNameXY(FX, LINE) MACRO_XY(FX, LINE)
 #define MAKE_NAME(FX) MACRO_MakeNameXY(FX, __LINE__)
 
+inline void* operator new(size_t, void* p) throw() { return p; }
+
 namespace vm {
 
 typedef void* object;
@@ -24,6 +26,81 @@ const unsigned BitsPerWord = BytesPerWord * 8;
 
 const unsigned LikelyPageSize = 4 * 1024;
 
+inline unsigned
+max(unsigned a, unsigned b)
+{
+  return (a > b ? a : b);
+}
+
+inline unsigned
+min(unsigned a, unsigned b)
+{
+  return (a < b ? a : b);
+}
+
+inline unsigned
+pad(unsigned n)
+{
+  unsigned extra = n % BytesPerWord;
+  return (extra ? n + BytesPerWord - extra : n);
+}
+
+inline unsigned
+divide(unsigned n, unsigned d)
+{
+  if (n and d > n) return 1;
+  return (n / d) + (n % d ? 1 : 0);
+}
+
+inline bool
+powerOfTwo(unsigned n)
+{
+  for (; n > 2; n >>= 1) if (n & 1) return false;
+  return true;
+}
+
+inline unsigned
+nextPowerOfTwo(unsigned n)
+{
+  unsigned r = 1;
+  while (r < n) r <<= 1;
+  return r;
+}
+
+inline unsigned
+log(unsigned n)
+{
+  if (n < 3) return 1;
+  unsigned r = 0;
+  for (unsigned i = 1; i < n; ++r) i <<= 1;
+  return r;
+}
+
+inline unsigned
+wordOf(unsigned i)
+{
+  return i / BitsPerWord;
+}
+
+inline unsigned
+bitOf(unsigned i)
+{
+  return i % BitsPerWord;
+}
+
+inline unsigned
+indexOf(unsigned word, unsigned bit)
+{
+  return (word * BitsPerWord) + bit;
+}
+
+template <class T>
+inline T&
+cast(object p, unsigned offset)
+{
+  return *reinterpret_cast<T*>(static_cast<uint8_t*>(p) + offset);
+}
+
 }
 
 #endif//COMMON_H