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Reserved Memory.md

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127 - Reserved Memory

Solidity reserves four 32-byte slots, with specific byte ranges (inclusive of endpoints) being used as follows:

  1. 0x00 - 0x3f (64 bytes): scratch space for hashing methods

  2. 0x40 - 0x5f (32 bytes): currently allocated memory size (aka. free memory pointer)

  3. 0x60 - 0x7f (32 bytes): zero slot (The zero slot is used as initial value for dynamic memory arrays and should never be written to)

Slide Screenshot

127.jpg

Slide Text

  • Solidity -> 4 32 Byte Slots
  • 0x00-0x3f (64B)
    • Hashing -> Scratch Space
  • 0x40-0x5f (32B)
    • Free Memory Pointer
  • 0x60-0x7f (32B)
    • Zero Slot

References

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