Move platform abstraction to base library

src/utils.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_UTILS_H_
 #define V8_UTILS_H_
 
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/allocation.h"
+#include "src/base/logging.h"
 #include "src/base/macros.h"
-#include "src/checks.h"
+#include "src/base/platform/platform.h"
 #include "src/globals.h"
 #include "src/list.h"
-#include "src/platform.h"
 #include "src/vector.h"
 
 namespace v8 {
 namespace internal {
 
 // ----------------------------------------------------------------------------
 // General helper functions
 
-// Returns true iff x is a power of 2. Cannot be used with the maximally
-// negative value of the type T (the -1 overflows).
-template <typename T>
-inline bool IsPowerOf2(T x) {
-  return IS_POWER_OF_TWO(x);
-}
-
-
 // X must be a power of 2.  Returns the number of trailing zeros.
 inline int WhichPowerOf2(uint32_t x) {
   ASSERT(IsPowerOf2(x));
   int bits = 0;
 #ifdef DEBUG
   int original_x = x;
 #endif
   if (x >= 0x10000) {
     bits += 16;
     x >>= 16;
@@ skipping 39 matching lines @@
 
 
 // The C++ standard leaves the semantics of '>>' undefined for
 // negative signed operands. Most implementations do the right thing,
 // though.
 inline int ArithmeticShiftRight(int x, int s) {
   return x >> s;
 }
 
 
-// Compute the 0-relative offset of some absolute value x of type T.
-// This allows conversion of Addresses and integral types into
-// 0-relative int offsets.
-template <typename T>
-inline intptr_t OffsetFrom(T x) {
-  return x - static_cast<T>(0);
-}
-
-
-// Compute the absolute value of type T for some 0-relative offset x.
-// This allows conversion of 0-relative int offsets into Addresses and
-// integral types.
-template <typename T>
-inline T AddressFrom(intptr_t x) {
-  return static_cast<T>(static_cast<T>(0) + x);
-}
-
-
-// Return the largest multiple of m which is <= x.
-template <typename T>
-inline T RoundDown(T x, intptr_t m) {
-  ASSERT(IsPowerOf2(m));
-  return AddressFrom<T>(OffsetFrom(x) & -m);
-}
-
-
-// Return the smallest multiple of m which is >= x.
-template <typename T>
-inline T RoundUp(T x, intptr_t m) {
-  return RoundDown<T>(static_cast<T>(x + m - 1), m);
-}
-
-
-// Increment a pointer until it has the specified alignment.
-// This works like RoundUp, but it works correctly on pointer types where
-// sizeof(*pointer) might not be 1.
-template<class T>
-T AlignUp(T pointer, size_t alignment) {
-  ASSERT(sizeof(pointer) == sizeof(uintptr_t));
-  uintptr_t pointer_raw = reinterpret_cast<uintptr_t>(pointer);
-  return reinterpret_cast<T>(RoundUp(pointer_raw, alignment));
-}
-
-
 template <typename T>
 int Compare(const T& a, const T& b) {
   if (a == b)
     return 0;
   else if (a < b)
     return -1;
   else
     return 1;
 }
 
 
 template <typename T>
 int PointerValueCompare(const T* a, const T* b) {
   return Compare<T>(*a, *b);
 }
 
 
 // Compare function to compare the object pointer value of two
 // handlified objects. The handles are passed as pointers to the
 // handles.
 template<typename T> class Handle;  // Forward declaration.
 template <typename T>
 int HandleObjectPointerCompare(const Handle<T>* a, const Handle<T>* b) {
   return Compare<T*>(*(*a), *(*b));
 }
 
 
-// Returns the smallest power of two which is >= x. If you pass in a
-// number that is already a power of two, it is returned as is.
-// Implementation is from "Hacker's Delight" by Henry S. Warren, Jr.,
-// figure 3-3, page 48, where the function is called clp2.
-inline uint32_t RoundUpToPowerOf2(uint32_t x) {
-  ASSERT(x <= 0x80000000u);
-  x = x - 1;
-  x = x | (x >> 1);
-  x = x | (x >> 2);
-  x = x | (x >> 4);
-  x = x | (x >> 8);
-  x = x | (x >> 16);
-  return x + 1;
-}
-
-
-inline uint32_t RoundDownToPowerOf2(uint32_t x) {
-  uint32_t rounded_up = RoundUpToPowerOf2(x);
-  if (rounded_up > x) return rounded_up >> 1;
-  return rounded_up;
-}
-
-
-template <typename T, typename U>
-inline bool IsAligned(T value, U alignment) {
-  return (value & (alignment - 1)) == 0;
-}
-
-
 // Returns true if (addr + offset) is aligned.
 inline bool IsAddressAligned(Address addr,
                              intptr_t alignment,
                              int offset = 0) {
   intptr_t offs = OffsetFrom(addr + offset);
   return IsAligned(offs, alignment);
 }
 
 
 // Returns the maximum of the two parameters.
@@ skipping 1405 matching lines @@
   }
 
   *index = result;
   return true;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_UTILS_H_