const int kHeapObjectTagSize = 2;
const intptr_t kHeapObjectTagMask = (1 << kHeapObjectTagSize) - 1;
-#ifdef V8_TARGET_ARCH_X64
// Tag information for Smi.
const int kSmiTag = 0;
const int kSmiTagSize = 1;
const intptr_t kSmiTagMask = (1 << kSmiTagSize) - 1;
-const int kSmiShiftSize = 31;
-const int kSmiValueSize = 32;
-#else
-// Tag information for Smi.
-const int kSmiTag = 0;
-const int kSmiTagSize = 1;
-const intptr_t kSmiTagMask = (1 << kSmiTagSize) - 1;
-const int kSmiShiftSize = 0;
-const int kSmiValueSize = 31;
-#endif
+
+template <size_t ptr_size> struct SmiConstants;
+
+// Smi constants for 32-bit systems.
+template <> struct SmiConstants<4> {
+ static const int kSmiShiftSize = 0;
+ static const int kSmiValueSize = 31;
+ static inline int SmiToInt(internal::Object* value) {
+ int shift_bits = kSmiTagSize + kSmiShiftSize;
+ // Throw away top 32 bits and shift down (requires >> to be sign extending).
+ return static_cast<int>(reinterpret_cast<intptr_t>(value)) >> shift_bits;
+ }
+};
+
+// Smi constants for 64-bit systems.
+template <> struct SmiConstants<8> {
+ static const int kSmiShiftSize = 31;
+ static const int kSmiValueSize = 32;
+ static inline int SmiToInt(internal::Object* value) {
+ int shift_bits = kSmiTagSize + kSmiShiftSize;
+ // Shift down and throw away top 32 bits.
+ return static_cast<int>(reinterpret_cast<intptr_t>(value) >> shift_bits);
+ }
+};
+
+const int kSmiShiftSize = SmiConstants<sizeof(void*)>::kSmiShiftSize;
+const int kSmiValueSize = SmiConstants<sizeof(void*)>::kSmiValueSize;
/**
* This class exports constants and functionality from within v8 that
}
static inline int SmiValue(internal::Object* value) {
-#ifdef V8_TARGET_ARCH_X64
- int shift_bits = kSmiTagSize + kSmiShiftSize;
- // Shift down and throw away top 32 bits.
- return static_cast<int>(reinterpret_cast<intptr_t>(value) >> shift_bits);
-#else
- int shift_bits = kSmiTagSize + kSmiShiftSize;
- // Throw away top 32 bits and shift down (requires >> to be sign extending).
- return static_cast<int>(reinterpret_cast<intptr_t>(value)) >> shift_bits;
-#endif
+ return SmiConstants<sizeof(void*)>::SmiToInt(value);
}
static inline int GetInstanceType(internal::Object* obj) {