watcher-ts/packages/solidity-mapper

solidity-mapper

Get value of state variable from storage for a solidity contract.

Pre-requisites

• NodeJS and NPM

  https://nodejs.org/en/ or use https://github.com/nvm-sh/nvm

Instructions

Run the tests using the following command

$ yarn test

Different Types

• Value Types
  • Booleans
  • Integers
  • Fixed Point Numbers
  • Address
  • Contract Types
  • Fixed-size byte arrays
  • Enums
  • Function Types
• Reference Types
  • Arrays
    • Fixed size arrays
      • Integer Type
      • Boolean Type
      • Address Type
      • Fixed-size byte arrays
      • Enum type
      • Dynamically-sized byte array
      • Struct Type
      • Mapping Type
    • Dynamically-sized arrays
      • Integer Type
      • Boolean Type
      • Address Type
      • Fixed-size byte arrays
      • Enum Type
      • Dynamically-sized byte array
      • Struct Type
      • Mapping Type
    • Nested Arrays
      • Fixed size arrays
      • Dynamically-sized arrays
  • Dynamically-sized byte array
    • Bytes
    • String
  • Structs
    • Value Types
    • Reference Types
  • Mapping Types
    • Value Type keys
    • Dynamically-sized byte array keys
    • Reference Type Mapping values
    • Nested Mapping

Observations

• The storage layouts are formed according to the rules in https://docs.soliditylang.org/en/latest/internals/layout_in_storage.html#layout-of-state-variables-in-storage

• Structs can occupy multiple slots depending on the size required by its members.

• Fixed arrays can occupy multiple slots according to the size of the array and the type of array.