Reland "Turn libbase into a component"

src/base/bits.h

 // Copyright 2014 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_BASE_BITS_H_
 #define V8_BASE_BITS_H_
 
 #include <stdint.h>
+
+#include "src/base/base-export.h"
 #include "src/base/macros.h"
 #if V8_CC_MSVC
 #include <intrin.h>
 #endif
 #if V8_OS_WIN32
 #include "src/base/win32-headers.h"
 #endif
 
 namespace v8 {
 namespace base {
@@ skipping 146 matching lines @@
 inline bool IsPowerOfTwo64(uint64_t value) {
   return value && !(value & (value - 1));
 }
 
 
 // RoundUpToPowerOfTwo32(value) returns the smallest power of two which is
 // greater than or equal to |value|. If you pass in a |value| that is already a
 // power of two, it is returned as is. |value| must be less than or equal to
 // 0x80000000u. Implementation is from "Hacker's Delight" by Henry S. Warren,
 // Jr., figure 3-3, page 48, where the function is called clp2.
-uint32_t RoundUpToPowerOfTwo32(uint32_t value);
-
+V8_BASE_EXPORT uint32_t RoundUpToPowerOfTwo32(uint32_t value);
 
 // RoundDownToPowerOfTwo32(value) returns the greatest power of two which is
 // less than or equal to |value|. If you pass in a |value| that is already a
 // power of two, it is returned as is.
 inline uint32_t RoundDownToPowerOfTwo32(uint32_t value) {
   if (value > 0x80000000u) return 0x80000000u;
   uint32_t result = RoundUpToPowerOfTwo32(value);
   if (result > value) result >>= 1;
   return result;
 }
@@ skipping 47 matching lines @@
 #else
   uint32_t res = static_cast<uint32_t>(lhs) - static_cast<uint32_t>(rhs);
   *val = bit_cast<int32_t>(res);
   return ((res ^ lhs) & (res ^ ~rhs) & (1U << 31)) != 0;
 #endif
 }
 
 // SignedMulOverflow32(lhs,rhs,val) performs a signed multiplication of |lhs|
 // and |rhs| and stores the result into the variable pointed to by |val| and
 // returns true if the signed multiplication resulted in an overflow.
-bool SignedMulOverflow32(int32_t lhs, int32_t rhs, int32_t* val);
+V8_BASE_EXPORT bool SignedMulOverflow32(int32_t lhs, int32_t rhs, int32_t* val);
 
 // SignedAddOverflow64(lhs,rhs,val) performs a signed summation of |lhs| and
 // |rhs| and stores the result into the variable pointed to by |val| and
 // returns true if the signed summation resulted in an overflow.
 inline bool SignedAddOverflow64(int64_t lhs, int64_t rhs, int64_t* val) {
   uint64_t res = static_cast<uint64_t>(lhs) + static_cast<uint64_t>(rhs);
   *val = bit_cast<int64_t>(res);
   return ((res ^ lhs) & (res ^ rhs) & (1ULL << 63)) != 0;
 }
 
 
 // SignedSubOverflow64(lhs,rhs,val) performs a signed subtraction of |lhs| and
 // |rhs| and stores the result into the variable pointed to by |val| and
 // returns true if the signed subtraction resulted in an overflow.
 inline bool SignedSubOverflow64(int64_t lhs, int64_t rhs, int64_t* val) {
   uint64_t res = static_cast<uint64_t>(lhs) - static_cast<uint64_t>(rhs);
   *val = bit_cast<int64_t>(res);
   return ((res ^ lhs) & (res ^ ~rhs) & (1ULL << 63)) != 0;
 }
 
 // SignedMulOverflow64(lhs,rhs,val) performs a signed multiplication of |lhs|
 // and |rhs| and stores the result into the variable pointed to by |val| and
 // returns true if the signed multiplication resulted in an overflow.
-bool SignedMulOverflow64(int64_t lhs, int64_t rhs, int64_t* val);
+V8_BASE_EXPORT bool SignedMulOverflow64(int64_t lhs, int64_t rhs, int64_t* val);
 
 // SignedMulHigh32(lhs, rhs) multiplies two signed 32-bit values |lhs| and
 // |rhs|, extracts the most significant 32 bits of the result, and returns
 // those.
-int32_t SignedMulHigh32(int32_t lhs, int32_t rhs);
-
+V8_BASE_EXPORT int32_t SignedMulHigh32(int32_t lhs, int32_t rhs);
 
 // SignedMulHighAndAdd32(lhs, rhs, acc) multiplies two signed 32-bit values
 // |lhs| and |rhs|, extracts the most significant 32 bits of the result, and
 // adds the accumulate value |acc|.
-int32_t SignedMulHighAndAdd32(int32_t lhs, int32_t rhs, int32_t acc);
-
+V8_BASE_EXPORT int32_t SignedMulHighAndAdd32(int32_t lhs, int32_t rhs,
+                                             int32_t acc);
 
 // SignedDiv32(lhs, rhs) divides |lhs| by |rhs| and returns the quotient
 // truncated to int32. If |rhs| is zero, then zero is returned. If |lhs|
 // is minint and |rhs| is -1, it returns minint.
-int32_t SignedDiv32(int32_t lhs, int32_t rhs);
-
+V8_BASE_EXPORT int32_t SignedDiv32(int32_t lhs, int32_t rhs);
 
 // SignedMod32(lhs, rhs) divides |lhs| by |rhs| and returns the remainder
 // truncated to int32. If either |rhs| is zero or |lhs| is minint and |rhs|
 // is -1, it returns zero.
-int32_t SignedMod32(int32_t lhs, int32_t rhs);
-
+V8_BASE_EXPORT int32_t SignedMod32(int32_t lhs, int32_t rhs);
 
 // UnsignedAddOverflow32(lhs,rhs,val) performs an unsigned summation of |lhs|
 // and |rhs| and stores the result into the variable pointed to by |val| and
 // returns true if the unsigned summation resulted in an overflow.
 inline bool UnsignedAddOverflow32(uint32_t lhs, uint32_t rhs, uint32_t* val) {
 #if V8_HAS_BUILTIN_SADD_OVERFLOW
   return __builtin_uadd_overflow(lhs, rhs, val);
 #else
   *val = lhs + rhs;
   return *val < (lhs | rhs);
 #endif
 }
 
 
 // UnsignedDiv32(lhs, rhs) divides |lhs| by |rhs| and returns the quotient
 // truncated to uint32. If |rhs| is zero, then zero is returned.
 inline uint32_t UnsignedDiv32(uint32_t lhs, uint32_t rhs) {
   return rhs ? lhs / rhs : 0u;
 }
 
 
 // UnsignedMod32(lhs, rhs) divides |lhs| by |rhs| and returns the remainder
 // truncated to uint32. If |rhs| is zero, then zero is returned.
 inline uint32_t UnsignedMod32(uint32_t lhs, uint32_t rhs) {
   return rhs ? lhs % rhs : 0u;
 }
 
 
 // Clamp |value| on overflow and underflow conditions.
-int64_t FromCheckedNumeric(const internal::CheckedNumeric<int64_t> value);
-
+V8_BASE_EXPORT int64_t
+FromCheckedNumeric(const internal::CheckedNumeric<int64_t> value);
 
 // SignedSaturatedAdd64(lhs, rhs) adds |lhs| and |rhs|,
 // checks and returns the result.
-int64_t SignedSaturatedAdd64(int64_t lhs, int64_t rhs);
-
+V8_BASE_EXPORT int64_t SignedSaturatedAdd64(int64_t lhs, int64_t rhs);
 
 // SignedSaturatedSub64(lhs, rhs) substracts |lhs| by |rhs|,
 // checks and returns the result.
-int64_t SignedSaturatedSub64(int64_t lhs, int64_t rhs);
-
+V8_BASE_EXPORT int64_t SignedSaturatedSub64(int64_t lhs, int64_t rhs);
 
 }  // namespace bits
 }  // namespace base
 }  // namespace v8
 
 #endif  // V8_BASE_BITS_H_