GasToken2.json

{
  "contractName": "GasToken2",
  "abi": [
    {
      "constant": true,
      "inputs": [],
      "name": "name",
      "outputs": [
        {
          "name": "",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function",
      "signature": "0x06fdde03"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "from",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "freeFromUpTo",
      "outputs": [
        {
          "name": "freed",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function",
      "signature": "0x079d229f"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "spender",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "approve",
      "outputs": [
        {
          "name": "success",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function",
      "signature": "0x095ea7b3"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "totalSupply",
      "outputs": [
        {
          "name": "supply",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function",
      "signature": "0x18160ddd"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "from",
          "type": "address"
        },
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "transferFrom",
      "outputs": [
        {
          "name": "success",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function",
      "signature": "0x23b872dd"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "decimals",
      "outputs": [
        {
          "name": "",
          "type": "uint8"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function",
      "signature": "0x313ce567"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "from",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
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      ],
      "name": "freeFrom",
      "outputs": [
        {
          "name": "success",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function",
      "signature": "0x5f2e2b45"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "freeUpTo",
      "outputs": [
        {
          "name": "freed",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function",
      "signature": "0x6366b936"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "owner",
          "type": "address"
        }
      ],
      "name": "balanceOf",
      "outputs": [
        {
          "name": "balance",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function",
      "signature": "0x70a08231"
    },
    {
      "constant": true,
      "inputs": [],
      "name": "symbol",
      "outputs": [
        {
          "name": "",
          "type": "string"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function",
      "signature": "0x95d89b41"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "mint",
      "outputs": [],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function",
      "signature": "0xa0712d68"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "to",
          "type": "address"
        },
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "transfer",
      "outputs": [
        {
          "name": "success",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function",
      "signature": "0xa9059cbb"
    },
    {
      "constant": false,
      "inputs": [
        {
          "name": "value",
          "type": "uint256"
        }
      ],
      "name": "free",
      "outputs": [
        {
          "name": "success",
          "type": "bool"
        }
      ],
      "payable": false,
      "stateMutability": "nonpayable",
      "type": "function",
      "signature": "0xd8ccd0f3"
    },
    {
      "constant": true,
      "inputs": [
        {
          "name": "owner",
          "type": "address"
        },
        {
          "name": "spender",
          "type": "address"
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      ],
      "name": "allowance",
      "outputs": [
        {
          "name": "remaining",
          "type": "uint256"
        }
      ],
      "payable": false,
      "stateMutability": "view",
      "type": "function",
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    {
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        {
          "indexed": true,
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          "indexed": true,
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          "type": "address"
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        {
          "indexed": false,
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      "name": "Transfer",
      "type": "event",
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        {
          "indexed": false,
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      "name": "Approval",
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    {
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          "indexed": false,
          "name": "_from",
          "type": "address"
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        {
          "indexed": false,
          "name": "_spender",
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        {
          "indexed": false,
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      "name": "DebugFreeFromUpTo",
      "type": "event",
      "signature": "0x092625ede2e7bf5c3d943ed55d931baab046f969a314368a1718e4aa6132bf22"
    }
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  "source": "pragma solidity 0.4.16;\n\nimport \"./Rlp.sol\";\n\ncontract GasToken2 is Rlp {\n    //////////////////////////////////////////////////////////////////////////\n    // Generic ERC20\n    //////////////////////////////////////////////////////////////////////////\n\n    // owner -> amount\n    mapping(address => uint256) s_balances;\n    // owner -> spender -> max amount\n    mapping(address => mapping(address => uint256)) s_allowances;\n\n    event Transfer(address indexed from, address indexed to, uint256 value);\n\n    event Approval(address indexed owner, address indexed spender, uint256 value);\n\n    // Spec: Get the account balance of another account with address `owner`\n    function balanceOf(address owner) public constant returns (uint256 balance) {\n        return s_balances[owner];\n    }\n\n    function internalTransfer(address from, address to, uint256 value) internal returns (bool success) {\n        if (value <= s_balances[from]) {\n            s_balances[from] -= value;\n            s_balances[to] += value;\n            Transfer(from, to, value);\n            return true;\n        } else {\n            return false;\n        }\n    }\n\n    // Spec: Send `value` amount of tokens to address `to`\n    function transfer(address to, uint256 value) public returns (bool success) {\n        address from = msg.sender;\n        return internalTransfer(from, to, value);\n    }\n\n    // Spec: Send `value` amount of tokens from address `from` to address `to`\n    function transferFrom(address from, address to, uint256 value) public returns (bool success) {\n        address spender = msg.sender;\n        if(value <= s_allowances[from][spender] && internalTransfer(from, to, value)) {\n            s_allowances[from][spender] -= value;\n            return true;\n        } else {\n            return false;\n        }\n    }\n\n    // Spec: Allow `spender` to withdraw from your account, multiple times, up\n    // to the `value` amount. If this function is called again it overwrites the\n    // current allowance with `value`.\n    function approve(address spender, uint256 value) public returns (bool success) {\n        address owner = msg.sender;\n        if (value != 0 && s_allowances[owner][spender] != 0) {\n            return false;\n        }\n        s_allowances[owner][spender] = value;\n        Approval(owner, spender, value);\n        return true;\n    }\n\n    // Spec: Returns the `amount` which `spender` is still allowed to withdraw\n    // from `owner`.\n    // What if the allowance is higher than the balance of the `owner`?\n    // Callers should be careful to use min(allowance, balanceOf) to make sure\n    // that the allowance is actually present in the account!\n    function allowance(address owner, address spender) public constant returns (uint256 remaining) {\n        return s_allowances[owner][spender];\n    }\n\n    //////////////////////////////////////////////////////////////////////////\n    // GasToken specifics\n    //////////////////////////////////////////////////////////////////////////\n\n    uint8 constant public decimals = 2;\n    string constant public name = \"Gastoken.io\";\n    string constant public symbol = \"GST2\";\n\n    // We build a queue of nonces at which child contracts are stored. s_head is\n    // the nonce at the head of the queue, s_tail is the nonce behind the tail\n    // of the queue. The queue grows at the head and shrinks from the tail.\n    // Note that when and only when a contract CREATEs another contract, the\n    // creating contract's nonce is incremented.\n    // The first child contract is created with nonce == 1, the second child\n    // contract is created with nonce == 2, and so on...\n    // For example, if there are child contracts at nonces [2,3,4],\n    // then s_head == 4 and s_tail == 1. If there are no child contracts,\n    // s_head == s_tail.\n    uint256 s_head;\n    uint256 s_tail;\n\n    // totalSupply gives  the number of tokens currently in existence\n    // Each token corresponds to one child contract that can be SELFDESTRUCTed\n    // for a gas refund.\n    function totalSupply() public constant returns (uint256 supply) {\n        return s_head - s_tail;\n    }\n\n    // Creates a child contract that can only be destroyed by this contract.\n    function makeChild() internal returns (address addr) {\n        assembly {\n            // EVM assembler of runtime portion of child contract:\n            //     ;; Pseudocode: if (msg.sender != 0x0000000000b3f879cb30fe243b4dfee438691c04) { throw; }\n            //     ;;             suicide(msg.sender)\n            //     PUSH15 0xb3f879cb30fe243b4dfee438691c04 ;; hardcoded address of this contract\n            //     CALLER\n            //     XOR\n            //     PC\n            //     JUMPI\n            //     CALLER\n            //     SELFDESTRUCT\n            // Or in binary: 6eb3f879cb30fe243b4dfee438691c043318585733ff\n            // Since the binary is so short (22 bytes), we can get away\n            // with a very simple initcode:\n            //     PUSH22 0x6eb3f879cb30fe243b4dfee438691c043318585733ff\n            //     PUSH1 0\n            //     MSTORE ;; at this point, memory locations mem[10] through\n            //            ;; mem[31] contain the runtime portion of the child\n            //            ;; contract. all that's left to do is to RETURN this\n            //            ;; chunk of memory.\n            //     PUSH1 22 ;; length\n            //     PUSH1 10 ;; offset\n            //     RETURN\n            // Or in binary: 756eb3f879cb30fe243b4dfee438691c043318585733ff6000526016600af3\n            // Almost done! All we have to do is put this short (31 bytes) blob into\n            // memory and call CREATE with the appropriate offsets.\n            let solidity_free_mem_ptr := mload(0x40)\n            mstore(solidity_free_mem_ptr, 0x00756eb3f879cb30fe243b4dfee438691c043318585733ff6000526016600af3)\n            addr := create(0, add(solidity_free_mem_ptr, 1), 31)\n        }\n    }\n\n    // Mints `value` new sub-tokens (e.g. cents, pennies, ...) by creating `value`\n    // new child contracts. The minted tokens are owned by the caller of this\n    // function.\n    function mint(uint256 value) public {\n        for (uint256 i = 0; i < value; i++) {\n            makeChild();\n        }\n        s_head += value;\n        s_balances[msg.sender] += value;\n    }\n\n    // Destroys `value` child contracts and updates s_tail.\n    //\n    // This function is affected by an issue in solc: https://github.com/ethereum/solidity/issues/2999\n    // The `mk_contract_address(this, i).call();` doesn't forward all available gas, but only GAS - 25710.\n    // As a result, when this line is executed with e.g. 30000 gas, the callee will have less than 5000 gas\n    // available and its SELFDESTRUCT operation will fail leading to no gas refund occurring.\n    // The remaining ~29000 gas left after the call is enough to update s_tail and the caller's balance.\n    // Hence tokens will have been destroyed without a commensurate gas refund.\n    // Fortunately, there is a simple workaround:\n    // Whenever you call free, freeUpTo, freeFrom, or freeUpToFrom, ensure that you pass at least\n    // 25710 + `value` * (1148 + 5722 + 150) gas. (It won't all be used)\n    function destroyChildren(uint256 value) internal {\n        uint256 tail = s_tail;\n        // tail points to slot behind the last contract in the queue\n        for (uint256 i = tail + 1; i <= tail + value; i++) {\n            mk_contract_address(this, i).call();\n        }\n\n        s_tail = tail + value;\n    }\n\n    // Frees `value` sub-tokens (e.g. cents, pennies, ...) belonging to the\n    // caller of this function by destroying `value` child contracts, which\n    // will trigger a partial gas refund.\n    // You should ensure that you pass at least 25710 + `value` * (1148 + 5722 + 150) gas\n    // when calling this function. For details, see the comment above `destroyChildren`.\n    function free(uint256 value) public returns (bool success) {\n        uint256 from_balance = s_balances[msg.sender];\n        if (value > from_balance) {\n            return false;\n        }\n\n        destroyChildren(value);\n\n        s_balances[msg.sender] = from_balance - value;\n\n        return true;\n    }\n\n    // Frees up to `value` sub-tokens. Returns how many tokens were freed.\n    // Otherwise, identical to free.\n    // You should ensure that you pass at least 25710 + `value` * (1148 + 5722 + 150) gas\n    // when calling this function. For details, see the comment above `destroyChildren`.\n    function freeUpTo(uint256 value) public returns (uint256 freed) {\n        uint256 from_balance = s_balances[msg.sender];\n        if (value > from_balance) {\n            value = from_balance;\n        }\n\n        destroyChildren(value);\n\n        s_balances[msg.sender] = from_balance - value;\n\n        return value;\n    }\n\n    // Frees `value` sub-tokens owned by address `from`. Requires that `msg.sender`\n    // has been approved by `from`.\n    // You should ensure that you pass at least 25710 + `value` * (1148 + 5722 + 150) gas\n    // when calling this function. For details, see the comment above `destroyChildren`.\n    function freeFrom(address from, uint256 value) public returns (bool success) {\n        address spender = msg.sender;\n        uint256 from_balance = s_balances[from];\n        if (value > from_balance) {\n            return false;\n        }\n\n        mapping(address => uint256) from_allowances = s_allowances[from];\n        uint256 spender_allowance = from_allowances[spender];\n        if (value > spender_allowance) {\n            return false;\n        }\n\n        destroyChildren(value);\n\n        s_balances[from] = from_balance - value;\n        from_allowances[spender] = spender_allowance - value;\n\n        return true;\n    }\n\n    event DebugFreeFromUpTo(address _from, address _spender, uint256 value);\n\n    // Frees up to `value` sub-tokens owned by address `from`. Returns how many tokens were freed.\n    // Otherwise, identical to `freeFrom`.\n    // You should ensure that you pass at least 25710 + `value` * (1148 + 5722 + 150) gas\n    // when calling this function. For details, see the comment above `destroyChildren`.\n    function freeFromUpTo(address from, uint256 value) public returns (uint256 freed) {\n        // TODO: WTF?!\n        return 0;\n\n        // address spender = msg.sender;\n\n        // uint256 from_balance = s_balances[from];\n        // if (value > from_balance) {\n        //     value = from_balance;\n        // }\n\n        // mapping(address => uint256) from_allowances = s_allowances[from];\n        // uint256 spender_allowance = from_allowances[spender];\n        // if (value > spender_allowance) {\n        //     value = spender_allowance;\n        // }\n\n        // destroyChildren(value);\n\n        // s_balances[from] = from_balance - value;\n        // from_allowances[spender] = spender_allowance - value;\n        // return value;\n    }\n}\n",
  "sourcePath": "../contracts-sol-compiler/external/gastoken/GasToken2.sol",
  "ast": {
    "absolutePath": "/usr/src/app/contracts-sol-compiler/external/gastoken/GasToken2.sol",
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