abi.encode encodes data into bytes.
abi.encode encodes data into bytes.
abi.decode decodes bytes back into data.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -949,7 +949,7 @@ Closing a channel when Alice and Bob do not agree on the final balances
return address(this).balance;
}
}
-Crowd fund ERC20 token
+`,Zj=({prev:s,next:a})=>i.jsx(A,{version:uj,title:yj,description:mj,cyfrinLink:bj,html:kj,prev:s,next:a,codes:wj}),Wj="0.8.26",Bj="Crowd Fund",Gj="An example of crowd funding contract",fj="",Vj=[{fileName:"CrowdFund.sol",code:"Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4yNjsKCmludGVyZmFjZSBJRVJDMjAgewogICAgZnVuY3Rpb24gdHJhbnNmZXIoYWRkcmVzcywgdWludDI1NikgZXh0ZXJuYWwgcmV0dXJucyAoYm9vbCk7CiAgICBmdW5jdGlvbiB0cmFuc2ZlckZyb20oYWRkcmVzcywgYWRkcmVzcywgdWludDI1NikgZXh0ZXJuYWwgcmV0dXJucyAoYm9vbCk7Cn0KCmNvbnRyYWN0IENyb3dkRnVuZCB7CiAgICBldmVudCBMYXVuY2goCiAgICAgICAgdWludDI1NiBpZCwKICAgICAgICBhZGRyZXNzIGluZGV4ZWQgY3JlYXRvciwKICAgICAgICB1aW50MjU2IGdvYWwsCiAgICAgICAgdWludDMyIHN0YXJ0QXQsCiAgICAgICAgdWludDMyIGVuZEF0CiAgICApOwogICAgZXZlbnQgQ2FuY2VsKHVpbnQyNTYgaWQpOwogICAgZXZlbnQgUGxlZGdlKHVpbnQyNTYgaW5kZXhlZCBpZCwgYWRkcmVzcyBpbmRleGVkIGNhbGxlciwgdWludDI1NiBhbW91bnQpOwogICAgZXZlbnQgVW5wbGVkZ2UodWludDI1NiBpbmRleGVkIGlkLCBhZGRyZXNzIGluZGV4ZWQgY2FsbGVyLCB1aW50MjU2IGFtb3VudCk7CiAgICBldmVudCBDbGFpbSh1aW50MjU2IGlkKTsKICAgIGV2ZW50IFJlZnVuZCh1aW50MjU2IGlkLCBhZGRyZXNzIGluZGV4ZWQgY2FsbGVyLCB1aW50MjU2IGFtb3VudCk7CgogICAgc3RydWN0IENhbXBhaWduIHsKICAgICAgICAvLyBDcmVhdG9yIG9mIGNhbXBhaWduCiAgICAgICAgYWRkcmVzcyBjcmVhdG9yOwogICAgICAgIC8vIEFtb3VudCBvZiB0b2tlbnMgdG8gcmFpc2UKICAgICAgICB1aW50MjU2IGdvYWw7CiAgICAgICAgLy8gVG90YWwgYW1vdW50IHBsZWRnZWQKICAgICAgICB1aW50MjU2IHBsZWRnZWQ7CiAgICAgICAgLy8gVGltZXN0YW1wIG9mIHN0YXJ0IG9mIGNhbXBhaWduCiAgICAgICAgdWludDMyIHN0YXJ0QXQ7CiAgICAgICAgLy8gVGltZXN0YW1wIG9mIGVuZCBvZiBjYW1wYWlnbgogICAgICAgIHVpbnQzMiBlbmRBdDsKICAgICAgICAvLyBUcnVlIGlmIGdvYWwgd2FzIHJlYWNoZWQgYW5kIGNyZWF0b3IgaGFzIGNsYWltZWQgdGhlIHRva2Vucy4KICAgICAgICBib29sIGNsYWltZWQ7CiAgICB9CgogICAgSUVSQzIwIHB1YmxpYyBpbW11dGFibGUgdG9rZW47CiAgICAvLyBUb3RhbCBjb3VudCBvZiBjYW1wYWlnbnMgY3JlYXRlZC4KICAgIC8vIEl0IGlzIGFsc28gdXNlZCB0byBnZW5lcmF0ZSBpZCBmb3IgbmV3IGNhbXBhaWducy4KICAgIHVpbnQyNTYgcHVibGljIGNvdW50OwogICAgLy8gTWFwcGluZyBmcm9tIGlkIHRvIENhbXBhaWduCiAgICBtYXBwaW5nKHVpbnQyNTYgPT4gQ2FtcGFpZ24pIHB1YmxpYyBjYW1wYWlnbnM7CiAgICAvLyBNYXBwaW5nIGZyb20gY2FtcGFpZ24gaWQgPT4gcGxlZGdlciA9PiBhbW91bnQgcGxlZGdlZAogICAgbWFwcGluZyh1aW50MjU2ID0+IG1hcHBpbmcoYWRkcmVzcyA9PiB1aW50MjU2KSkgcHVibGljIHBsZWRnZWRBbW91bnQ7CgogICAgY29uc3RydWN0b3IoYWRkcmVzcyBfdG9rZW4pIHsKICAgICAgICB0b2tlbiA9IElFUkMyMChfdG9rZW4pOwogICAgfQoKICAgIGZ1bmN0aW9uIGxhdW5jaCh1aW50MjU2IF9nb2FsLCB1aW50MzIgX3N0YXJ0QXQsIHVpbnQzMiBfZW5kQXQpIGV4dGVybmFsIHsKICAgICAgICByZXF1aXJlKF9zdGFydEF0ID49IGJsb2NrLnRpbWVzdGFtcCwgInN0YXJ0IGF0IDwgbm93Iik7CiAgICAgICAgcmVxdWlyZShfZW5kQXQgPj0gX3N0YXJ0QXQsICJlbmQgYXQgPCBzdGFydCBhdCIpOwogICAgICAgIHJlcXVpcmUoX2VuZEF0IDw9IGJsb2NrLnRpbWVzdGFtcCArIDkwIGRheXMsICJlbmQgYXQgPiBtYXggZHVyYXRpb24iKTsKCiAgICAgICAgY291bnQgKz0gMTsKICAgICAgICBjYW1wYWlnbnNbY291bnRdID0gQ2FtcGFpZ24oewogICAgICAgICAgICBjcmVhdG9yOiBtc2cuc2VuZGVyLAogICAgICAgICAgICBnb2FsOiBfZ29hbCwKICAgICAgICAgICAgcGxlZGdlZDogMCwKICAgICAgICAgICAgc3RhcnRBdDogX3N0YXJ0QXQsCiAgICAgICAgICAgIGVuZEF0OiBfZW5kQXQsCiAgICAgICAgICAgIGNsYWltZWQ6IGZhbHNlCiAgICAgICAgfSk7CgogICAgICAgIGVtaXQgTGF1bmNoKGNvdW50LCBtc2cuc2VuZGVyLCBfZ29hbCwgX3N0YXJ0QXQsIF9lbmRBdCk7CiAgICB9CgogICAgZnVuY3Rpb24gY2FuY2VsKHVpbnQyNTYgX2lkKSBleHRlcm5hbCB7CiAgICAgICAgQ2FtcGFpZ24gbWVtb3J5IGNhbXBhaWduID0gY2FtcGFpZ25zW19pZF07CiAgICAgICAgcmVxdWlyZShjYW1wYWlnbi5jcmVhdG9yID09IG1zZy5zZW5kZXIsICJub3QgY3JlYXRvciIpOwogICAgICAgIHJlcXVpcmUoYmxvY2sudGltZXN0YW1wIDwgY2FtcGFpZ24uc3RhcnRBdCwgInN0YXJ0ZWQiKTsKCiAgICAgICAgZGVsZXRlIGNhbXBhaWduc1tfaWRdOwogICAgICAgIGVtaXQgQ2FuY2VsKF9pZCk7CiAgICB9CgogICAgZnVuY3Rpb24gcGxlZGdlKHVpbnQyNTYgX2lkLCB1aW50MjU2IF9hbW91bnQpIGV4dGVybmFsIHsKICAgICAgICBDYW1wYWlnbiBzdG9yYWdlIGNhbXBhaWduID0gY2FtcGFpZ25zW19pZF07CiAgICAgICAgcmVxdWlyZShibG9jay50aW1lc3RhbXAgPj0gY2FtcGFpZ24uc3RhcnRBdCwgIm5vdCBzdGFydGVkIik7CiAgICAgICAgcmVxdWlyZShibG9jay50aW1lc3RhbXAgPD0gY2FtcGFpZ24uZW5kQXQsICJlbmRlZCIpOwoKICAgICAgICBjYW1wYWlnbi5wbGVkZ2VkICs9IF9hbW91bnQ7CiAgICAgICAgcGxlZGdlZEFtb3VudFtfaWRdW21zZy5zZW5kZXJdICs9IF9hbW91bnQ7CiAgICAgICAgdG9rZW4udHJhbnNmZXJGcm9tKG1zZy5zZW5kZXIsIGFkZHJlc3ModGhpcyksIF9hbW91bnQpOwoKICAgICAgICBlbWl0IFBsZWRnZShfaWQsIG1zZy5zZW5kZXIsIF9hbW91bnQpOwogICAgfQoKICAgIGZ1bmN0aW9uIHVucGxlZGdlKHVpbnQyNTYgX2lkLCB1aW50MjU2IF9hbW91bnQpIGV4dGVybmFsIHsKICAgICAgICBDYW1wYWlnbiBzdG9yYWdlIGNhbXBhaWduID0gY2FtcGFpZ25zW19pZF07CiAgICAgICAgcmVxdWlyZShibG9jay50aW1lc3RhbXAgPD0gY2FtcGFpZ24uZW5kQXQsICJlbmRlZCIpOwoKICAgICAgICBjYW1wYWlnbi5wbGVkZ2VkIC09IF9hbW91bnQ7CiAgICAgICAgcGxlZGdlZEFtb3VudFtfaWRdW21zZy5zZW5kZXJdIC09IF9hbW91bnQ7CiAgICAgICAgdG9rZW4udHJhbnNmZXIobXNnLnNlbmRlciwgX2Ftb3VudCk7CgogICAgICAgIGVtaXQgVW5wbGVkZ2UoX2lkLCBtc2cuc2VuZGVyLCBfYW1vdW50KTsKICAgIH0KCiAgICBmdW5jdGlvbiBjbGFpbSh1aW50MjU2IF9pZCkgZXh0ZXJuYWwgewogICAgICAgIENhbXBhaWduIHN0b3JhZ2UgY2FtcGFpZ24gPSBjYW1wYWlnbnNbX2lkXTsKICAgICAgICByZXF1aXJlKGNhbXBhaWduLmNyZWF0b3IgPT0gbXNnLnNlbmRlciwgIm5vdCBjcmVhdG9yIik7CiAgICAgICAgcmVxdWlyZShibG9jay50aW1lc3RhbXAgPiBjYW1wYWlnbi5lbmRBdCwgIm5vdCBlbmRlZCIpOwogICAgICAgIHJlcXVpcmUoY2FtcGFpZ24ucGxlZGdlZCA+PSBjYW1wYWlnbi5nb2FsLCAicGxlZGdlZCA8IGdvYWwiKTsKICAgICAgICByZXF1aXJlKCFjYW1wYWlnbi5jbGFpbWVkLCAiY2xhaW1lZCIpOwoKICAgICAgICBjYW1wYWlnbi5jbGFpbWVkID0gdHJ1ZTsKICAgICAgICB0b2tlbi50cmFuc2ZlcihjYW1wYWlnbi5jcmVhdG9yLCBjYW1wYWlnbi5wbGVkZ2VkKTsKCiAgICAgICAgZW1pdCBDbGFpbShfaWQpOwogICAgfQoKICAgIGZ1bmN0aW9uIHJlZnVuZCh1aW50MjU2IF9pZCkgZXh0ZXJuYWwgewogICAgICAgIENhbXBhaWduIG1lbW9yeSBjYW1wYWlnbiA9IGNhbXBhaWduc1tfaWRdOwogICAgICAgIHJlcXVpcmUoYmxvY2sudGltZXN0YW1wID4gY2FtcGFpZ24uZW5kQXQsICJub3QgZW5kZWQiKTsKICAgICAgICByZXF1aXJlKGNhbXBhaWduLnBsZWRnZWQgPCBjYW1wYWlnbi5nb2FsLCAicGxlZGdlZCA+PSBnb2FsIik7CgogICAgICAgIHVpbnQyNTYgYmFsID0gcGxlZGdlZEFtb3VudFtfaWRdW21zZy5zZW5kZXJdOwogICAgICAgIHBsZWRnZWRBbW91bnRbX2lkXVttc2cuc2VuZGVyXSA9IDA7CiAgICAgICAgdG9rZW4udHJhbnNmZXIobXNnLnNlbmRlciwgYmFsKTsKCiAgICAgICAgZW1pdCBSZWZ1bmQoX2lkLCBtc2cuc2VuZGVyLCBiYWwpOwogICAgfQp9Cg=="}],Yj=`Crowd fund ERC20 token
Deploy any contract by calling Proxy.deploy(bytes memory _code)
Deploy any contract by calling Proxy.deploy(bytes memory _code)
For this example, you can get the contract bytecodes by calling Helper.getBytecode1 and Helper.getBytecode2
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -1997,7 +1997,7 @@ How to swap tokens
return address(this).balance;
}
}
-Gasless ERC20 token transfer with Meta transaction
+`,BA=({prev:s,next:a})=>i.jsx(A,{version:mA,title:bA,description:wA,cyfrinLink:kA,html:WA,prev:s,next:a,codes:ZA}),GA="0.8.26",fA="Gasless Token Transfer",VA="Gasless ERC20 token transfer with Meta transaction",YA="",XA=[{fileName:"ERC20Permit.sol",code:"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ERC20 token transfer with Meta transaction
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -2222,7 +2222,7 @@ How to swap tokens
_mint(to, amount);
}
}
-You cannot iterate through a mapping. So here is an example of how to create an iterable mapping.
You cannot iterate through a mapping. So here is an example of how to create an iterable mapping.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -2762,7 +2762,7 @@ How to swap tokens
return abi.encodeWithSignature("callMe(uint256)", 123);
}
}
-Simple example of contract written in bytecode
+`,bu=({prev:s,next:a})=>i.jsx(A,{version:Cu,title:ju,description:Au,cyfrinLink:uu,html:mu,prev:s,next:a,codes:yu}),wu="0.8.26",ku="Simple Bytecode Contract",Zu="Simple example of contract written in bytecode",Wu="",Bu=[{fileName:"Factory.sol",code:"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"}],Gu=`Simple example of contract written in bytecode
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -2819,7 +2819,7 @@ PUSH1 0x0a
PUSH1 0x16
RETURN
*/
-TimeLock is a contract that publishes a transaction to be executed in the future.
+`,fu=({prev:s,next:a})=>i.jsx(A,{version:wu,title:ku,description:Zu,cyfrinLink:Wu,html:Gu,prev:s,next:a,codes:Bu}),Vu="0.8.26",Yu="Time Lock",Xu="Time Lock",vu="",Ru=[{fileName:"TimeLock.sol",code:"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"}],Nu=`
TimeLock is a contract that publishes a transaction to be executed in the future.
After a minimum waiting period, the transaction can be executed.
TimeLocks are commonly used in DAOs.
// SPDX-License-Identifier: MIT
@@ -2970,7 +2970,7 @@ After a minimum waiting period, the transaction can be executed.
emit Cancel(_txId);
}
}
-Payment channels allow participants to repeatedly transfer Ether off chain.
+`,Hu=({prev:s,next:a})=>i.jsx(A,{version:Vu,title:Yu,description:Xu,cyfrinLink:vu,html:Nu,prev:s,next:a,codes:Ru}),Fu="0.8.26",Ku="Uni-Directional Payment Channel",Mu="An example of uni-directional payment channels in Solidity",Su="",xu=[{fileName:"ECDSA.sol",code:"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91bnR9KCIiKTsKICAgICAgICByZXF1aXJlKHNlbnQsICJGYWlsZWQgdG8gc2VuZCBFdGhlciIpOwogICAgICAgIHNlbGZkZXN0cnVjdChzZW5kZXIpOwogICAgfQoKICAgIGZ1bmN0aW9uIGNhbmNlbCgpIGV4dGVybmFsIHsKICAgICAgICByZXF1aXJlKG1zZy5zZW5kZXIgPT0gc2VuZGVyLCAiIXNlbmRlciIpOwogICAgICAgIHJlcXVpcmUoYmxvY2sudGltZXN0YW1wID49IGV4cGlyZXNBdCwgIiFleHBpcmVkIik7CiAgICAgICAgc2VsZmRlc3RydWN0KHNlbmRlcik7CiAgICB9Cn0K"}],Ju=`Payment channels allow participants to repeatedly transfer Ether off chain.
Here is how this contract is used:
Alice deploys the contract, funding it with some Ether.Example of upgradeable proxy contract. Never use this in production.
@@ -3624,7 +3676,7 @@ Each slot in the array can store 32 bytes. } } } -`,ky=({prev:s,next:a})=>i.jsx(A,{version:Ay,title:uy,description:yy,cyfrinLink:my,html:wy,prev:s,next:a,codes:by}),Zy="0.8.26",Wy="Assembly Loop",Gy="Example of loop in assembly",By="https://www.cyfrin.io/glossary/assembly-loop-code-example",fy=[{fileName:"AssemblyLoop.sol",code:"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"}],Vy=`Example of loop in assembly
+`,ky=({prev:s,next:a})=>i.jsx(A,{version:Ay,title:uy,description:yy,cyfrinLink:my,html:wy,prev:s,next:a,codes:by}),Zy="0.8.26",Wy="Assembly Loop",By="Example of loop in assembly",Gy="https://www.cyfrin.io/glossary/assembly-loop-code-example",fy=[{fileName:"AssemblyLoop.sol",code:"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"}],Vy=`Example of loop in assembly
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -3645,7 +3697,7 @@ Each slot in the array can store 32 bytes.
}
}
}
-Example of math in assembly
Example of math in assembly
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -4074,7 +4126,7 @@ Each slot in the array can store 32 bytes.
contract E is X, Y {
constructor() Y("Y was called") X("X was called") {}
}
-Variables are declared as either storage, memory or calldata to explicitly
+`,Wm=({prev:s,next:a})=>i.jsx(A,{version:ym,title:mm,description:bm,cyfrinLink:wm,html:Zm,prev:s,next:a,codes:km}),Bm="0.8.26",Gm="Data Locations - Storage, Memory and Calldata",fm="Data locations - storage, memory and calldata",Vm="https://www.cyfrin.io/glossary/data-locations-storage-memory-and-calldata-code-example",Ym=[{fileName:"DataLocations.sol",code:"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"}],Xm=`
Variables are declared as either storage, memory or calldata to explicitly
specify the location of the data.
storage - variable is a state variable (store on blockchain)// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -5348,7 +5400,7 @@ Topics
external
returns (bool);
}
-This is a minimal example of a contract that rewards users for staking their token.
+`,mb=({prev:s,next:a})=>i.jsx(A,{version:db,title:Cb,description:jb,cyfrinLink:Ab,html:yb,prev:s,next:a,codes:ub}),bb="0.8.26",wb="Staking Rewards",kb="Staking rewards contract based on Synthetix StakingRewards.sol",Zb="",Wb=[{fileName:"StakingRewards.sol",code:"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"}],Bb=`This is a minimal example of a contract that rewards users for staking their token.
Code is a stripped down version of Synthetix StakingRewards.sol
// SPDX-License-Identifier: MIT
@@ -5495,7 +5547,7 @@ Topics
external
returns (bool);
}
-swapExactTokensForTokens sells all tokens for another.
swapExactTokensForTokens sells all tokens for another.
swapTokensForExactTokens buys specific amount of tokens set by the caller.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -6908,7 +6960,7 @@ IERC20 constant PAIR Uniswap V3
-`,ww=({prev:s,next:a})=>i.jsx(A,{version:jw,title:Aw,description:uw,cyfrinLink:yw,html:bw,prev:s,next:a,codes:mw}),kw="0.8.26",Zw="Uniswap V3 Swap Examples",Ww="Uniswap V3 swap 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V3 Single Hop Swap
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V3 Single Hop Swap
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -7224,7 +7276,7 @@ IERC20 constant PAIR address(swap)), 0, "DAI balance of swap != 0");
}
}
-
`,Vw=({prev:s,next:a})=>i.jsx(A,{version:kw,title:Zw,description:Ww,cyfrinLink:Gw,html:fw,prev:s,next:a,codes:Bw}),Yw="0.8.26",Xw="Vault",vw="Vault",Rw="",Nw=[{fileName:"Vault.sol",code:"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"}],Hw=`Simple example of vault contract, commonly used in DeFi protocols.
+Simple example of vault contract, commonly used in DeFi protocols.
Most vaults on the mainnet are more complex. Here we will focus on the math for calculating shares to mint on deposit and the amount of token to withdraw.
view or pure functions, as they alter the state of the blockchain by storing logs.Examples of
+`,Zk=({prev:s,next:a})=>i.jsx(A,{version:uk,title:yk,description:mk,cyfrinLink:bk,html:kk,prev:s,next:a,codes:wk}),Wk="0.8.26",Bk="EVM Memory Layout in Solidity",Gk="Example of EVM memory in Solidity",fk="",Vk=[{fileName:"YulMem.sol",code:"// SPDX-License-Identifier: MIT
pragma solidity 0.8.26;

// Memory layout
// array of length 2**256 (32 bytes), each element stores 1 byte (0x00 to 0xff)
// index     0    1    2   ...   0xfff...fff = 2**256 - 1
// memory | 00 | 00 | 00 | ... | 00 |

// Reserved slots
// 0x00 - 0x3f (64 bytes): scratch space for hashing methods
// 0x40 - 0x5f (32 bytes): free memory pointer - pointer to next available location in memory to store data
// 0x60 - 0x7f (32 bytes): zero slot - used as initial value for dynamic memory arrays and should never be written to

// Free memory pointer (0x40)
// 0x80 = Free memory pointer initially points here
contract MemBasic {
    // mstore(p, v) = store 32 bytes to memory starting at memory location p
    // mload(p) = load 32 bytes from memory starting at memory location p
    function test_1() public pure returns (bytes32 b32) {
        assembly {
            // Free memory pointer
            // p = 0x80
            let p := mload(0x40)
            mstore(p, 0xababab)
            b32 := mload(p)
        }
    }

    function test_2() public pure {
        assembly {
            mstore(0, 0x11)
            // index: 32 bytes of data stored in memory from index
            //  0x00: 0x0000000000000000000000000000000000000000000000000000000000000011
            mstore(1, 0x22)
            //           0 1
            //  0x00: 0x0000000000000000000000000000000000000000000000000000000000000000
            //  0x20: 0x2200000000000000000000000000000000000000000000000000000000000000
            mstore(2, 0x33)
            //           0 1 2
            //  0x00: 0x0000000000000000000000000000000000000000000000000000000000000000
            //  0x20: 0x0033000000000000000000000000000000000000000000000000000000000000
            mstore(3, 0x44)
            //           0 1 2 3
            //  0x00: 0x0000000000000000000000000000000000000000000000000000000000000000
            //  0x20: 0x0000440000000000000000000000000000000000000000000000000000000000
        }
    }
}

contract MemStruct {
    // Memory data is not packed - all data stored in chunks of 32 bytes
    struct Point {
        uint256 x;
        uint32 y;
        uint32 z;
    }

    function test_read()
        public
        pure
        returns (uint256 x, uint256 y, uint256 z)
    {
        // Point is loaded to memory starting at 0x80
        // 0x80 = initial free memory
        Point memory p = Point(1, 2, 3);

        assembly {
            // load 32 bytes starting from 0x80
            x := mload(0x80)
            // load 32 bytes starting from 0xa0 (0x80 + 32 = 0xa0)
            y := mload(0xa0)
            // load 32 bytes starting from 0xc0 (0xa0 + 32 = 0xc0)
            z := mload(0xc0)
        }
    }

    function test_write()
        public
        pure
        returns (bytes32 free_mem_ptr, uint256 x, uint256 y, uint256 z)
    {
        // Allocates memory 0x80 to 0xdf to Point
        // Free memory pointer = 0xdf + 1 = 0xe0
        Point memory p;

        // Write
        assembly {
            // store to 0x80
            mstore(p, 11)
            // store to 0xa0
            mstore(add(p, 0x20), 22)
            // store to 0xc0
            mstore(add(p, 0x40), 33)
            // 0xe0
            free_mem_ptr := mload(0x40)
        }

        x = p.x;
        y = p.y;
        z = p.z;
    }
}

contract MemFixedArray {
    function test_read()
        public
        pure
        returns (uint256 a0, uint256 a1, uint256 a2)
    {
        // arr is loaded to memory starting at 0x80
        // Each array element is stored as 32 bytes
        uint32[3] memory arr = [uint32(1), uint32(2), uint32(3)];

        assembly {
            a0 := mload(0x80)
            a1 := mload(0xa0)
            a2 := mload(0xc0)
        }
    }

    function test_write()
        public
        pure
        returns (uint256 a0, uint256 a1, uint256 a2)
    {
        uint32[3] memory arr;

        assembly {
            // 0x80
            mstore(arr, 11)
            // 0xa0
            mstore(add(arr, 0x20), 22)
            // 0xc0
            mstore(add(arr, 0x40), 33)
        }

        a0 = arr[0];
        a1 = arr[1];
        a2 = arr[2];
    }
}

contract MemDynamicArray {
    function test_read()
        public
        pure
        returns (bytes32 p, uint256 len, uint256 a0, uint256 a1, uint256 a2)
    {
        uint256[] memory arr = new uint256[](5);
        arr[0] = uint256(11);
        arr[1] = uint256(22);
        arr[2] = uint256(33);
        arr[3] = uint256(44);
        arr[4] = uint256(55);

        assembly {
            p := arr
            // 0x80
            len := mload(arr)
            // 0xa0
            a0 := mload(add(arr, 0x20))
            // 0xc0
            a1 := mload(add(arr, 0x40))
            // 0xe0
            a2 := mload(add(arr, 0x60))
        }
    }

    function test_write() public pure returns (bytes32 p, uint256[] memory) {
        uint256[] memory arr = new uint256[](0);

        assembly {
            p := arr
            // Store length of arr
            mstore(arr, 3)
            // Store 1, 2, 3
            mstore(add(arr, 0x20), 11)
            mstore(add(arr, 0x40), 22)
            mstore(add(arr, 0x60), 33)
            // Update free memory pointer
            mstore(0x40, add(arr, 0x80))
        }

        // Data will be ABI encoded when arr is returned to caller
        return (p, arr);
    }
}

contract MemInternalFuncReturn {
    function internal_func_return_val() private pure returns (uint256) {
        return uint256(0xababab);
    }

    function test_val() public pure {
        // 0xababab will be stored in top of the stack
        internal_func_return_val();
    }

    function internal_func_return_mem()
        private
        pure
        returns (bytes32[] memory)
    {
        bytes32[] memory arr = new bytes32[](3);
        arr[0] = bytes32(uint256(0xaaa));
        arr[1] = bytes32(uint256(0xbbb));
        arr[2] = bytes32(uint256(0xccc));
        return arr;
    }

    function test_mem()
        public
        pure
        returns (uint256 len, bytes32 a0, bytes32 a1, bytes32 a2)
    {
        // Stores 0x80 to top of the stack
        // 0x80 = memory pointer to beginning of arr
        internal_func_return_mem();
        // Read data from arr, initialized in internal_func_return_mem, using assembly
        assembly {
            len := mload(0x80)
            a0 := mload(0xa0)
            a1 := mload(0xc0)
            a2 := mload(0xe0)
        }
    }
}

contract ABIEncode {
    // js code to split string into chunks of length 64
    // str.match(/.{1,64}/g)

    // Value types < 32 bytes -> zero padded on the left side
    // 0x000000000000000000000000abababababababababababababababababababab
    function encode_addr() public pure returns (bytes memory) {
        address addr = 0xABaBaBaBABabABabAbAbABAbABabababaBaBABaB;
        return abi.encode(addr);
    }

    // Fixed sized bytes -> zero padded on the righ side
    // 0xaabbccdd00000000000000000000000000000000000000000000000000000000
    function encode_bytes4() public pure returns (bytes memory) {
        bytes4 b4 = 0xaabbccdd;
        return abi.encode(b4);
    }

    // Dynamic size types
    // offset | length | data
    // offset = 32 bytes index where data starts
    // length = 32 bytes data length

    // 0x0000000000000000000000000000000000000000000000000000000000000020
    //   0000000000000000000000000000000000000000000000000000000000000003
    //   ababab0000000000000000000000000000000000000000000000000000000000
    function encode_bytes() public pure returns (bytes memory) {
        bytes memory b = new bytes(3);
        b[0] = 0xab;
        b[1] = 0xab;
        b[2] = 0xab;
        return abi.encode(b);
    }

    // 0x0000000000000000000000000000000000000000000000000000000000000020
    //   0000000000000000000000000000000000000000000000000000000000000003
    //   0000000000000000000000000000000000000000000000000000000000000001
    //   0000000000000000000000000000000000000000000000000000000000000002
    //   0000000000000000000000000000000000000000000000000000000000000003
    function encode_uint8_arr() public pure returns (bytes memory) {
        uint8[] memory a = new uint8[](3);
        a[0] = 1;
        a[1] = 2;
        a[2] = 3;
        return abi.encode(a);
    }

    // Fixed size arrays
    // 0x0000000000000000000000000000000000000000000000000000000000000001
    //   0000000000000000000000000000000000000000000000000000000000000002
    //   0000000000000000000000000000000000000000000000000000000000000003
    function encode_uint256_fixed_size_arr()
        public
        pure
        returns (bytes memory)
    {
        uint8[3] memory a;
        a[0] = 1;
        a[1] = 2;
        a[2] = 3;
        return abi.encode(a);
    }

    // Struct
    struct Point {
        uint256 x;
        uint128 y;
        uint128 z;
    }

    // 0x0000000000000000000000000000000000000000000000000000000000000001
    //   0000000000000000000000000000000000000000000000000000000000000002
    //   0000000000000000000000000000000000000000000000000000000000000003
    function encode_struct() public pure returns (bytes memory) {
        Point memory p = Point(1, 2, 3);
        return abi.encode(p);
    }

    // Dynamic sized array of structs
    // offset | length | struct data
    // 0x0000000000000000000000000000000000000000000000000000000000000020
    //   0000000000000000000000000000000000000000000000000000000000000003
    //   0000000000000000000000000000000000000000000000000000000000000001
    //   0000000000000000000000000000000000000000000000000000000000000002
    //   0000000000000000000000000000000000000000000000000000000000000003
    //   0000000000000000000000000000000000000000000000000000000000000004
    //   0000000000000000000000000000000000000000000000000000000000000005
    //   0000000000000000000000000000000000000000000000000000000000000006
    //   0000000000000000000000000000000000000000000000000000000000000007
    //   0000000000000000000000000000000000000000000000000000000000000008
    //   0000000000000000000000000000000000000000000000000000000000000009
    function encode_struct_array() public pure returns (bytes memory) {
        Point[] memory arr = new Point[](3);
        arr[0] = Point(1, 2, 3);
        arr[1] = Point(4, 5, 6);
        arr[2] = Point(7, 8, 9);
        return abi.encode(arr);
    }
}

contract MemReturn {
    function test_return_vals() public pure returns (uint256, uint256) {
        // return(start, len) - Halt execution and return data stored in memory from start to start + len
        assembly {
            mstore(0x80, 11)
            mstore(0xa0, 22)
            return(0x80, 0x40)
        }
    }

    function test_return_dyn_arr() public pure returns (uint256[] memory) {
        // ABI encode uint256[] array with 3 elements 11, 22 and 33
        assembly {
            // offset
            mstore(0x80, 0x20)
            // length
            mstore(add(0x80, 0x20), 3)
            // array elements
            mstore(add(0x80, 0x40), 11)
            mstore(add(0x80, 0x60), 22)
            mstore(add(0x80, 0x80), 33)
            // No need to update free memory pointer - function execution ends here
            return(0x80, mul(5, 0x20))
        }
    }

    function test_return() public pure returns (uint256, uint256) {
        // Returns (11, 22)
        test_return_vals();
        // This code will never execute
        return (333, 444);
    }
}

contract MemRevert {
    function test_revert() public pure {
        // revert(start, len) - Revert execution and return data store in memory from start to start + len
        assembly {
            mstore(0x80, "ERROR HERE")
            revert(0x80, 0x20)
        }
    }

    function test_revert_with_error_msg() public pure {
        assembly {
            let p := mload(0x40)
            // function selector of Error(string)
            // 0x08c379a000000000000000000000000000000000000000000000000000000000
            // 0x08c379a0 is 32 bits, shift left by 224 to make it 256 bits
            // 255 - 31 = 224
            mstore(p, shl(224, 0x08c379a0))
            // String offset
            mstore(add(p, 0x04), 0x20)
            // String length
            mstore(add(p, 0x24), 5)
            // Message (must be less than 32 bytes)
            mstore(add(p, 0x44), "ERROR")
            // function selector + offset + string length + string message
            // = 0x04 + 0x20 + 0x20 + 0x20
            // = 0x64
            revert(p, 0x64)
        }
    }
}

contract MemKeccak {
    function test_keccak() public pure returns (bytes32) {
        // keccak256(start, len) - Keccak256 from data in memory from start to start + len
        assembly {
            mstore(0x80, 1)
            mstore(0xa0, 2)

            let h := keccak256(0x80, 0x40)
            mstore(0xc0, h)

            return(0xc0, 0x20)
        }
    }

    function keccak() public pure returns (bytes32) {
        return keccak256(abi.encodePacked(uint256(1), uint256(2)));
    }
}

contract Target {
    function return_uint256(uint256 x) public pure returns (uint256) {
        return x;
    }

    function return_bytes(uint256 n) public pure returns (bytes memory) {
        bytes memory out = new bytes(n);
        for (uint256 i; i < n; i++) {
            out[i] = 0xab;
        }
        return out;
    }

    function return_uint256_arr(uint256 n)
        public
        pure
        returns (uint256[] memory)
    {
        uint256[] memory out = new uint256[](n);
        for (uint256 i = 0; i < n; i++) {
            out[i] = i + 1;
        }
        return out;
    }
}

// calldatacopy(p, start, size) - Copy start to start + size calldata to memory starting at pointer p
// returndatasize - Get size of returned data from call, staticcall or delegatecall
// returndatacopy(p, start, size) - Copy start to start + size return data to memory starting at pointer p
// call(g, a, v, in, in_size, out, out_size)
// - call contract at a, use max g gas, send v wei
// - with input from memory in to in + in_size
// - use memory out to out + out_size for output
// staticcall(g, a, in, in_size, out, out_size) - read only version of call
contract YulStaticCall {
    function test_staticcall(address a, bytes calldata data) public view {
        assembly {
            let p := mload(0x40)
            // Copy calldata to memory
            calldatacopy(p, data.offset, data.length)

            let ok := staticcall(gas(), a, p, data.length, 0, 0)

            if iszero(ok) { revert(0, 0) }

            // p := mload(0x40)
            let return_data_size := returndatasize()
            // Copy returned data to memory
            // Is it safe to overwrite memory that was used for inputs?
            returndatacopy(p, 0, return_data_size)
            return(p, return_data_size)
        }
    }

    function test_abi_decode_uint256(address a, bytes calldata data)
        public
        view
        returns (uint256)
    {
        test_staticcall(a, data);
    }

    function test_abi_decode_bytes(address a, bytes calldata data)
        public
        view
        returns (bytes memory)
    {
        test_staticcall(a, data);
    }

    function test_abi_decode_uint256_arr(address a, bytes calldata data)
        public
        view
        returns (uint256[] memory)
    {
        test_staticcall(a, data);
    }

    function test_staticcall_return_abi_encoded_bytes(
        address addr,
        bytes calldata data
    ) public view returns (bytes memory out, uint256 return_data_size) {
        assembly {
            let p := mload(0x40)
            // Copy calldata to memory
            calldatacopy(p, data.offset, data.length)
            // Update free memory pointer
            mstore(0x40, add(p, data.length))

            let ok := staticcall(gas(), addr, p, data.length, 0, 0)

            if iszero(ok) { revert(0, 0) }

            // return_data_size = 32  for calling Target.return_uint256 -> uint256
            //                  = 96  for calling Target.return_bytes -> bytes[] (32 offset, 32 length, 3 bytes padded to 32)
            //                  = 160 for calling Target.return_uint256_arr -> uint256[] (32 offset, 32 length, 32 x 3 elements)
            return_data_size := returndatasize()
            // Store length of return data to out
            // pointer to out = 0x60 (zero slot)
            mstore(out, return_data_size)
            // Copy return data to out
            returndatacopy(add(out, 0x20), 0, return_data_size)
            // Update free memory pointer
            mstore(0x40, add(out, add(0x20, return_data_size)))
        }
    }
}

contract Counter {
    uint256 public count;

    function inc() public returns (uint256) {
        count += 1;
        return count;
    }
}

contract YulCall {
    function test_call(address a, bytes memory data)
        public
        payable
        returns (bytes memory out)
    {
        assembly {
            // 0x80
            let data_ptr := data
            // 0x60
            let out_ptr := out

            let data_size := mload(data)
            let data_start := add(data, 0x20)
            let ok := call(gas(), a, callvalue(), data_start, data_size, 0, 0)

            if iszero(ok) { revert(0, 0) }

            let return_data_size := returndatasize()
            // Store length of return data to out
            mstore(out, return_data_size)
            // Copy return data to out
            returndatacopy(add(out, 0x20), 0, return_data_size)
            // Update free memory pointer
            mstore(0x40, add(out, add(0x20, return_data_size)))
        }
    }

    function test_inc(address counter) public returns (uint256 count) {
        bytes memory res = test_call(counter, abi.encodeCall(Counter.inc, ()));
        count = abi.decode(res, (uint256));
    }
}

// Memory expansion gas cost
// Gas cost is quadratic to memory allocation.
contract MemExp {
    function alloc_mem(uint256 n) external view returns (uint256) {
        uint256 gas_start = gasleft();
        uint256[] memory arr = new uint256[](n);
        uint256 gas_end = gasleft();
        return gas_start - gas_end;
    }
}

// arr size | gas
//        0 |    120
//        1 |    178
//       10 |    232
//       20 |    293
//       30 |    354
//       40 |    415
//       50 |    477
//       60 |    540
//       70 |    602
//       80 |    666
//       90 |    729
//      100 |    793
//      110 |    857
//      120 |    922
//      130 |    987
//      140 |   1053
//      150 |   1118
//      160 |   1185
//      170 |   1251
//      180 |   1318
//      190 |   1386
//      200 |   1454

//     1000 |   8144
//     2000 |  20023
//     3000 |  35808
//     4000 |  55500
//     5000 |  79097
//     6000 | 106601
//     7000 | 138011
//     8000 | 173328
//     9000 | 212550
//    10000 | 255679
//    11000 | 302715
//    12000 | 353656
//    13000 | 408504
//    14000 | 467257
//    15000 | 529918
//    16000 | 596484
//    17000 | 666957
//    18000 | 741336
//    19000 | 819621
//    20000 | 901812
"}],Yk=`Examples of
assemblyExamples of
+`,Xk=({prev:s,next:a})=>i.jsx(A,{version:Wk,title:Bk,description:Gk,cyfrinLink:fk,html:Yk,prev:s,next:a,codes:Vk}),vk="0.8.26",Rk="EVM Storage",Nk="Example of EVM storage in Solidity",Hk="",Fk=[{fileName:"EVMStorage.sol",code:"// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

// Yul - language used for Solidity inline assembly
contract YulIntro {
    // Yul assignment
    function test_yul_var() public pure returns (uint256) {
        uint256 s = 0;

        assembly {
            // Declare variable
            let x := 1
            // Reassign
            x := 2
            // Assign to Solidity variable
            s := 2
        }

        return s;
    }

    // Yul types (everything is bytes32)
    function test_yul_types()
        public
        pure
        returns (bool x, uint256 y, bytes32 z)
    {
        assembly {
            x := 1
            y := 0xaaa
            z := "Hello Yul"
        }

        return (x, y, z);
    }
}

contract EVMStorageSingleSlot {
    // EVM storage
    // 2**256 slots, each slot can store up to 32 bytes
    // Slots are assigned in the order the state variables are declared
    // Data < 32 bytes are packed into a slot (right to left)
    // sstore(k, v) = store v to slot k
    // sload(k) = load 32 bytes from slot k

    // Single variable stored in one slot
    // slot 0
    uint256 public s_x;
    // slot 1
    uint256 public s_y;
    // slot 2
    bytes32 public s_z;

    function test_sstore() public {
        assembly {
            sstore(0, 111)
            sstore(1, 222)
            sstore(2, 0xababab)
        }
    }

    function test_sstore_again() public {
        // Access slot using .slot
        assembly {
            sstore(s_x.slot, 123)
            sstore(s_y.slot, 456)
            sstore(s_z.slot, 0xcdcdcd)
        }
    }

    function test_sload()
        public
        view
        returns (uint256 x, uint256 y, bytes32 z)
    {
        assembly {
            x := sload(0)
            y := sload(1)
            z := sload(2)
        }

        return (x, y, z);
    }

    function test_sload_again()
        public
        view
        returns (uint256 x, uint256 y, bytes32 z)
    {
        assembly {
            x := sload(s_x.slot)
            y := sload(s_y.slot)
            z := sload(s_z.slot)
        }

        return (x, y, z);
    }
}

contract EVMStoratePackedSlotBytes {
    // slot 0 (packed right to left)
    bytes4 public b4 = 0xabababab;
    bytes2 public b2 = 0xcdcd;

    function get() public view returns (bytes32 b32) {
        assembly {
            b32 := sload(0)
        }
    }
}

contract BitMasking {
    function test_mask() public pure returns (bytes32 mask) {
        assembly {
            // |       256 bits        |
            // 000 ... 000 | 111 ... 111
            //             | 16 bits
            // 0x000000000000000000000000000000000000000000000000000000000000ffff
            mask := sub(shl(16, 1), 1)
        }
    }

    function test_shift_mask() public pure returns (bytes32 mask) {
        assembly {
            // |               256 bits                |
            // 000 ... 000 | 111 ... 111 | 000 ... 000 |
            //             | 16 bits     | 32 bits
            // 0x0000000000000000000000000000000000000000000000000000ffff00000000
            mask := shl(32, sub(shl(16, 1), 1))
        }
    }

    function test_not_mask() public pure returns (bytes32 mask) {
        assembly {
            // |               256 bits                |
            // 111 ... 111 | 000 ... 000 | 111 ... 111 |
            //             | 16 bits     | 32 bits
            // 0xffffffffffffffffffffffffffffffffffffffffffffffffffff0000ffffffff
            mask := not(shl(32, sub(shl(16, 1), 1)))
        }
    }
}

contract EVMStoragePackedSlot {
    // Data < 32 bytes are packed into a slot
    // Bit masking (how to create 111...111)
    // slot, offset

    // slot 0
    uint128 public s_a;
    uint64 public s_b;
    uint32 public s_c;
    uint32 public s_d;
    // slot 1
    // 20 bytes = 160 bits
    address public s_addr;
    // 96 bits
    uint64 public s_x;
    uint32 public s_y;

    function test_sstore() public {
        assembly {
            // Load 32 bytes from slot0
            let v := sload(0)

            // s_d | s_c | s_b | s_a
            // 32  | 32  | 64  | 128 bits

            // Set s_a = 11
            // mask = all 1s at and to the left of 128 bit counting from right
            //        111 ... 111 | 000 ... 000
            //                    |    128 bits
            let mask_a := not(sub(shl(128, 1), 1))
            // Set left most 128 bits to 0
            v := and(v, mask_a)
            // Set s_a = 11
            v := or(v, 11)

            // Set s_b = 22
            // mask = 111...111 | 000 ... 000 | 111 ... 111
            //                  |     64 bits |    128 bits
            let mask_b := not(shl(128, sub(shl(64, 1), 1)))
            // Clear previous value of s_b by setting bits (128 to 191 bits) to 0
            v := and(v, mask_b)
            v := or(v, shl(128, 22))

            // Set s_c = 33
            // mask = 111...111 | 000...000 | 111 ... 111 | 111 ... 111
            //                  |   32 bits |     64 bits |    128 bits
            let mask_c := not(shl(192, sub(shl(32, 1), 1)))
            // Clear previous value of s_c by setting bits (192 to 223 bits) to 0
            v := and(v, mask_c)
            v := or(v, shl(192, 33))

            // Set s_d = 44
            // mask = 000...000 | 111...111 | 111 ... 111 | 111 ... 111
            //                  |   32 bits |     64 bits |    128 bits
            let mask_d := not(shl(224, sub(shl(32, 1), 1)))
            // Clear previous value of s_d by setting bits (224 to 255 bits) to 0
            v := and(v, mask_d)
            v := or(v, shl(224, 44))

            // Store new value to slot0
            sstore(0, v)
        }
    }

    function test_slot_0_offset()
        public
        pure
        returns (
            uint256 a_offset,
            uint256 b_offset,
            uint256 c_offset,
            uint256 d_offset
        )
    {
        // a_offset =  0 =  0 * 8 =   0 bits
        // b_offset = 16 = 16 * 8 = 128 bits
        // c_offset = 24 = 24 * 8 = 192 bits
        // d_offset = 28 = 28 * 8 = 224 bits
        assembly {
            a_offset := s_a.offset
            b_offset := s_b.offset
            c_offset := s_c.offset
            d_offset := s_d.offset
        }
    }

    function test_slot_1_offset()
        public
        pure
        returns (uint256 addr_offset, uint256 x_offset, uint256 y_offset)
    {
        // addr_offset = 0
        // x_offset = 20
        // y_offset = 28
        assembly {
            addr_offset := s_addr.offset
            x_offset := s_x.offset
            y_offset := s_y.offset
        }
    }

    // slot and offset
    function test_sstore_using_offset() public {
        // a_offset =  0 =  0 * 8 =   0 bits
        // b_offset = 16 = 16 * 8 = 128 bits
        // c_offset = 24 = 24 * 8 = 192 bits
        // d_offset = 28 = 28 * 8 = 224 bits
        assembly {
            // Load 32 bytes from slot0
            let v := sload(s_a.slot)

            // s_d | s_c | s_b | s_a
            // 32  | 32  | 64  | 128 bits

            // Set s_a = 111
            // mask = all 1s at and to the left of 128 bit counting from right
            //        111 ... 111 | 000 ... 000
            //                    |    128 bits
            let mask_a := not(sub(shl(128, 1), 1))
            // Set left most 128 bits to 0
            v := and(v, mask_a)
            // Set s_a = 1
            v := or(v, 111)

            // Set s_b = 222
            // mask = 111...111 | 000 ... 000 | 111 ... 111
            //                  |     64 bits |    128 bits
            let mask_b := not(shl(mul(s_b.offset, 8), sub(shl(64, 1), 1)))
            // Clear previous value of s_b by setting bits (128 to 191 bits) to 0
            v := and(v, mask_b)
            v := or(v, shl(mul(s_b.offset, 8), 222))

            // Set s_c = 333
            // mask = 111...111 | 000...000 | 111 ... 111 | 111 ... 111
            //                  |   32 bits |     64 bits |    128 bits
            let mask_c := not(shl(mul(s_c.offset, 8), sub(shl(32, 1), 1)))
            // Clear previous value of s_c by setting bits (192 to 223 bits) to 0
            v := and(v, mask_c)
            v := or(v, shl(mul(s_c.offset, 8), 333))

            // Set s_d = 444
            // mask = 000...000 | 111...111 | 111 ... 111 | 111 ... 111
            //                  |   32 bits |     64 bits |    128 bits
            let mask_d := not(shl(mul(s_d.offset, 8), sub(shl(32, 1), 1)))
            // Clear previous value of s_d by setting bits (224 to 255 bits) to 0
            v := and(v, mask_d)
            v := or(v, shl(mul(s_d.offset, 8), 444))

            // Store new value to slot0
            sstore(s_a.slot, v)
        }
    }
}

contract EVMStorageStruct {
    struct SingleSlot {
        uint128 x;
        uint64 y;
        uint64 z;
    }

    struct MultipleSlots {
        uint256 a;
        uint256 b;
        uint256 c;
    }

    // slot 0
    SingleSlot public single = SingleSlot({x: 1, y: 2, z: 3});
    // slot 1, 2, 3
    MultipleSlots public multi = MultipleSlots({a: 11, b: 22, c: 33});

    function test_get_single_slot_struct()
        public
        view
        returns (uint128 x, uint64 y, uint64 z)
    {
        assembly {
            let s := sload(0)
            //  z |  y | x
            // 64 | 64 | 128 bits
            // Casting cuts off bits to the left
            x := s
            y := shr(128, s)
            z := shr(192, s)
        }
    }

    function test_get_multiple_slots_struct()
        public
        view
        returns (uint256 a, uint256 b, uint256 c)
    {
        assembly {
            a := sload(1)
            b := sload(2)
            c := sload(3)
        }
    }
}

contract EVMStorageConstants {
    // slot 0
    uint256 public s0 = 1;
    // Constants and immutables don't use storage
    uint256 public constant X = 123;
    address public immutable owner;
    // slot 1
    uint256 public s1 = 2;

    constructor() {
        owner = msg.sender;
    }

    function test_get_slots() public view returns (uint256 v0, uint256 v1) {
        assembly {
            v0 := sload(0)
            v1 := sload(1)
        }
    }
}

contract EVMStorageFixedArray {
    // Fixed array with elements = 32 bytes, slot of element = slot where array is declared + index of array element
    // slots 0, 1, 2
    uint256[3] private arr_0 = [1, 2, 3];
    // slots 3, 4, 5
    uint256[3] private arr_1 = [4, 5, 6];
    // slot + index of packed data
    // slots 6, 6, 7, 7, 8
    uint128[5] private arr_2 = [7, 8, 9, 10, 11];

    function test_arr_0(uint256 i) public view returns (uint256 v) {
        assembly {
            // arr_0 starts from slot 0
            v := sload(add(0, i))
        }
    }

    function test_arr_1(uint256 i) public view returns (uint256 v) {
        assembly {
            // arr_1 starts from slot 3
            v := sload(add(3, i))
        }
    }

    function test_arr_2(uint256 i) public view returns (uint128 v) {
        assembly {
            // arr_2 starts from slot 6
            let b32 := sload(add(6, div(i, 2)))
            // slot 6 = 1st element | 0th element
            // slot 7 = 3rd element | 2nd element
            // slot 8 = 000 ... 000 | 4th element

            // i is even => get right 128 bits => cast bytes32 to uint128 (cut off left 128 bits)
            // i is odd  => get left 128 bits  => shift right 128 bits

            switch mod(i, 2)
            case 1 { v := shr(128, b32) }
            default { v := b32 }
        }
    }
}

contract EVMStorageDynamicArray {
    // slot of element = keccak256(slot where this array is declared) + size of element * index of element
    // keccak256(0) + 1 * index
    uint256[] private arr = [11, 22, 33];
    // keccak256(1) + 1 / 2 * index
    uint128[] private arr_2 = [1, 2, 3];

    function test_arr(uint256 slot, uint256 i)
        public
        view
        returns (uint256 v, bytes32 b32, uint256 len)
    {
        bytes32 start = keccak256(abi.encode(slot));

        assembly {
            len := sload(slot)
            v := sload(add(start, i))
            b32 := v
        }
    }
}

contract EVMStorageMapping {
    // slot of value = keccack256(key, slot where mapping is declared)
    mapping(address => uint256) public map;

    address public constant ADDR_1 = address(1);
    address public constant ADDR_2 = address(2);
    address public constant ADDR_3 = address(3);

    constructor() {
        map[ADDR_1] = 11;
        map[ADDR_2] = 22;
        map[ADDR_3] = 33;
    }

    function test_mapping(address key) public view returns (uint256 v) {
        uint256 slot = 0;
        bytes32 slot_v = keccak256(abi.encode(key, slot));

        assembly {
            v := sload(slot_v)
        }
    }
}

contract EVMStorageNestedMapping {
    // key0 => key1 => val
    // slot of value = keccak256(key1, keccack256(key0, slot where nested mapping is declared))
    mapping(address => mapping(address => uint256)) public map;

    address public constant ADDR_1 = address(1);
    address public constant ADDR_2 = address(2);
    address public constant ADDR_3 = address(3);

    constructor() {
        map[ADDR_1][ADDR_2] = 11;
        map[ADDR_2][ADDR_3] = 22;
        map[ADDR_3][ADDR_1] = 33;
    }

    function test_nested_mapping(address key_0, address key_1)
        public
        view
        returns (uint256 v)
    {
        uint256 slot = 0;
        bytes32 s0 = keccak256(abi.encode(key_0, slot));
        bytes32 s1 = keccak256(abi.encode(key_1, s0));

        assembly {
            v := sload(s1)
        }
    }
}

contract EVMStorageMappingArray {
    // slot of value in a mapping = keccak256(key, slot)
    // slot of array element = keccak256(slot) + index
    // mapping -> array -> keccak256(keccak256(key, slot of map declaration)) + index
    mapping(address => uint256[]) public map;

    address public constant ADDR_1 = address(1);
    address public constant ADDR_2 = address(2);

    constructor() {
        map[ADDR_1].push(11);
        map[ADDR_1].push(22);
        map[ADDR_1].push(33);
        map[ADDR_2].push(44);
        map[ADDR_2].push(55);
        map[ADDR_2].push(66);
    }

    function test_map_arr(address addr, uint256 i)
        public
        view
        returns (uint256 v, uint256 len)
    {
        uint256 map_slot = 0;
        bytes32 map_hash = keccak256(abi.encode(addr, map_slot));
        bytes32 arr_hash = keccak256(abi.encode(map_hash));

        assembly {
            len := sload(map_hash)
            v := sload(add(arr_hash, i))
        }
    }
}

contract EVMStorageDynamicArrayStruct {
    struct Point {
        uint256 x;
        uint128 y;
        uint128 z;
    }

    // slot of element = keccak256(slot where this array is declared) + index of element
    // keccak256(0) + index * size of struct
    Point[] private arr;

    constructor() {
        arr.push(Point(11, 22, 33));
        arr.push(Point(44, 55, 66));
        arr.push(Point(77, 88, 99));
    }

    function test_struct_arr(uint256 i)
        public
        view
        returns (uint256 x, uint128 y, uint128 z, uint256 len)
    {
        uint256 slot = 0;
        bytes32 start = keccak256(abi.encode(slot));

        assembly {
            len := sload(slot)
            // s0 = keccak256(0)
            // index | slot        | values
            //     0 | slot s0 + 0 | arr[0].x
            //     0 | slot s0 + 1 | arr[0].z | arr[0].y
            //     1 | slot s0 + 2 | arr[1].x
            //     1 | slot s0 + 3 | arr[1].z | arr[1].y
            //     2 | slot s0 + 4 | arr[2].x
            //     2 | slot s0 + 5 | arr[2].z | arr[2].y
            x := sload(add(start, mul(i, 2)))
            let zy := sload(add(start, add(mul(i, 2), 1)))
            // uint128 cuts off left most 128 bits from 32 bytes
            y := zy
            z := shr(128, zy)
        }
    }
}
"}],Kk=`Examples of
assemblySome gas saving techniques.
+`,B0=({prev:s,next:a})=>i.jsx(A,{version:m0,title:b0,description:w0,cyfrinLink:k0,html:W0,prev:s,next:a,codes:Z0}),G0="0.8.26",f0="Gas Saving Techniques",V0="Some gas saving techniques",Y0="https://www.cyfrin.io/glossary/gas-saving-techniques-code-example",X0=[{fileName:"GasGolf.sol",code:"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"}],v0=`Some gas saving techniques.
memory with calldataAll data on a smart contract can be read.
Let's see how we can read private data. In the process you will learn how Solidity stores state variables.
// SPDX-License-Identifier: MIT
@@ -9750,7 +9802,7 @@ DeployerDeployer -- create2 --> Deployer -- create --> Attack
selfdestruct(payable(address(0)));
}
}
-Transactions take some time before they are mined. An attacker can watch the transaction pool and send a transaction, have it included in a block before the original transaction. This mechanism can be abused to re-order transactions to the attacker's advantage.
@@ -9783,12 +9835,15 @@ before the original. */ contract FindThisHash { - bytes32 public constant hash = 0x564ccaf7594d66b1eaaea24fe01f0585bf52ee70852af4eac0cc4b04711cd0e2; + bytes32 public constant hash = + 0x564ccaf7594d66b1eaaea24fe01f0585bf52ee70852af4eac0cc4b04711cd0e2; constructor() payable {} function solve(string memory solution) public { - require(hash == keccak256(abi.encodePacked(solution)), "Incorrect answer"); + require( + hash == keccak256(abi.encodePacked(solution)), "Incorrect answer" + ); (bool sent,) = msg.sender.call{value: 10 ether}(""); require(sent, "Failed to send Ether"); @@ -9841,7 +9896,8 @@ before the original. } // The hash that is needed to be solved - bytes32 public hash = 0x564ccaf7594d66b1eaaea24fe01f0585bf52ee70852af4eac0cc4b04711cd0e2; + bytes32 public hash = + 0x564ccaf7594d66b1eaaea24fe01f0585bf52ee70852af4eac0cc4b04711cd0e2; // Address of the winner address public winner; @@ -9881,7 +9937,12 @@ before the original. Function to get the commit details. It returns a tuple of (solutionHash, commitTime, revealStatus); Users can get solution only if the game is active and they have committed a solutionHash */ - function getMySolution() public view gameActive returns (bytes32, uint256, bool) { + function getMySolution() + public + view + gameActive + returns (bytes32, uint256, bool) + { Commit storage commit = commits[msg.sender]; require(commit.commitTime != 0, "Not committed yet"); return (commit.solutionHash, commit.commitTime, commit.revealed); @@ -9895,16 +9956,25 @@ before the original. the game is ended and the reward amount is sent to the winner. */ - function revealSolution(string memory _solution, string memory _secret) public gameActive { + function revealSolution(string memory _solution, string memory _secret) + public + gameActive + { Commit storage commit = commits[msg.sender]; require(commit.commitTime != 0, "Not committed yet"); - require(commit.commitTime < block.timestamp, "Cannot reveal in the same block"); + require( + commit.commitTime < block.timestamp, + "Cannot reveal in the same block" + ); require(!commit.revealed, "Already commited and revealed"); - bytes32 solutionHash = keccak256(abi.encodePacked(msg.sender, _solution, _secret)); + bytes32 solutionHash = + keccak256(abi.encodePacked(msg.sender, _solution, _secret)); require(solutionHash == commit.solutionHash, "Hash doesn't match"); - require(keccak256(abi.encodePacked(_solution)) == hash, "Incorrect answer"); + require( + keccak256(abi.encodePacked(_solution)) == hash, "Incorrect answer" + ); winner = msg.sender; ended = true; @@ -9917,7 +9987,7 @@ before the original. } } } -`,fZ=({prev:s,next:a})=>i.jsx(A,{version:wZ,title:kZ,description:ZZ,cyfrinLink:WZ,html:BZ,prev:s,next:a,codes:GZ}),VZ="0.8.26",YZ="Hiding Malicious Code with External Contract",XZ="An example of exploit where malicious code is hidden in an external contract in Solidity",vZ="",RZ=[{fileName:"ExternalContract.sol",code:"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"}],NZ=`In Solidity any address can be casted into specific contract, even if the contract at the address is not the one being casted.
This can be exploited to hide malicious code. Let's see how.
@@ -10400,7 +10470,7 @@ Here is how the functions were called locked = false; } } -`,jW=({prev:s,next:a})=>i.jsx(A,{version:iW,title:gW,description:hW,cyfrinLink:IW,html:CW,prev:s,next:a,codes:dW}),AW="0.8.26",uW="Self Destruct",yW="An example of how to delete your smart contract by calling seldestruct in Solidity",mW="",bW=[{fileName:"ForceEther.sol",code:"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"},{fileName:"PreventForceEther.sol",code:"Ly8gU1BEWC1MaWNlbnNlLUlkZW50aWZpZXI6IE1JVApwcmFnbWEgc29saWRpdHkgXjAuOC4yNjsKCmNvbnRyYWN0IEV0aGVyR2FtZSB7CiAgICB1aW50MjU2IHB1YmxpYyB0YXJnZXRBbW91bnQgPSAzIGV0aGVyOwogICAgdWludDI1NiBwdWJsaWMgYmFsYW5jZTsKICAgIGFkZHJlc3MgcHVibGljIHdpbm5lcjsKCiAgICBmdW5jdGlvbiBkZXBvc2l0KCkgcHVibGljIHBheWFibGUgewogICAgICAgIHJlcXVpcmUobXNnLnZhbHVlID09IDEgZXRoZXIsICJZb3UgY2FuIG9ubHkgc2VuZCAxIEV0aGVyIik7CgogICAgICAgIGJhbGFuY2UgKz0gbXNnLnZhbHVlOwogICAgICAgIHJlcXVpcmUoYmFsYW5jZSA8PSB0YXJnZXRBbW91bnQsICJHYW1lIGlzIG92ZXIiKTsKCiAgICAgICAgaWYgKGJhbGFuY2UgPT0gdGFyZ2V0QW1vdW50KSB7CiAgICAgICAgICAgIHdpbm5lciA9IG1zZy5zZW5kZXI7CiAgICAgICAgfQogICAgfQoKICAgIGZ1bmN0aW9uIGNsYWltUmV3YXJkKCkgcHVibGljIHsKICAgICAgICByZXF1aXJlKG1zZy5zZW5kZXIgPT0gd2lubmVyLCAiTm90IHdpbm5lciIpOwoKICAgICAgICAoYm9vbCBzZW50LCkgPSBtc2cuc2VuZGVyLmNhbGx7dmFsdWU6IGJhbGFuY2V9KCIiKTsKICAgICAgICByZXF1aXJlKHNlbnQsICJGYWlsZWQgdG8gc2VuZCBFdGhlciIpOwogICAgfQp9Cg=="}],wW=`Contracts can be deleted from the blockchain by calling selfdestruct.
Contracts can be deleted from the blockchain by calling selfdestruct.
selfdestruct sends all remaining Ether stored in the contract to a
designated address.
Signing messages off-chain and having a contract that requires that signature before executing +`,kW=({prev:s,next:a})=>i.jsx(A,{version:AW,title:uW,description:yW,cyfrinLink:mW,html:wW,prev:s,next:a,codes:bW}),ZW="0.8.26",WW="Signature Replay",BW="An example of a contract vulnerable to signature replay attack",GW="",fW=[{fileName:"ECDSA.sol",code:"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"}],VW=`
Signing messages off-chain and having a contract that requires that signature before executing a function is a useful technique.
For example this technique is used to:
Vault shares can be inflated by donating ERC20 token to the vault.
Attacker can exploit this behavior to steal other user's deposits.
Solidity supports multiple inheritance. Contracts can inherit other contract by using the is keyword.
Solidity supports multiple inheritance. Contracts can inherit other contract by using the is keyword.
Function that is going to be overridden by a child contract must be declared as virtual.
Function that is going to override a parent function must use the keyword override.
Order of inheritance is important.
@@ -11304,7 +11374,7 @@ F D,E return super.foo(); } } -`,v2=({prev:s,next:a})=>i.jsx(A,{version:G2,title:B2,description:f2,cyfrinLink:V2,html:X2,prev:s,next:a,codes:Y2}),R2="0.8.26",N2="Interface",H2="An example of interface in Solidity",F2="https://www.cyfrin.io/glossary/interface-code-example",K2=[{fileName:"Interface.sol",code:"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"}],M2=`You can interact with other contracts by declaring an Interface.
You can interact with other contracts by declaring an Interface.
Interface
Maps are created with the syntax mapping(keyType => valueType).
Maps are created with the syntax mapping(keyType => valueType).
The keyType can be any built-in value type, bytes, string, or any contract.
valueType can be any type including another mapping or an array.
Mappings are not iterable.
@@ -11497,7 +11567,7 @@ you can't send ether. delete nested[_addr1][_i]; } } -`,cG=({prev:s,next:a})=>i.jsx(A,{version:sG,title:aG,description:nG,cyfrinLink:lG,html:eG,prev:s,next:a,codes:pG}),tG="0.8.26",oG="Contract that Creates other Contracts",rG="Learn how to create new contracts from inside of a contract with Solidity",iG="https://www.cyfrin.io/glossary/contract-that-creates-other-contracts-code-example",gG=[{fileName:"NewContract.sol",code:"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"}],hG=`Contracts can be created by other contracts using the new keyword. Since 0.8.0, new keyword supports create2 feature by specifying salt options.
Contracts can be created by other contracts using the new keyword. Since 0.8.0, new keyword supports create2 feature by specifying salt options.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -11560,7 +11630,7 @@ you can't send ether.
return (car.owner(), car.model(), car.carAddr(), address(car).balance);
}
}
-Functions and addresses declared payable can receive ether into the contract.
Functions and addresses declared payable can receive ether into the contract.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -11599,7 +11669,7 @@ you can't send ether.
require(success, "Failed to send Ether");
}
}
-Here we introduce you to some primitive data types available in Solidity.
+`,mB=({prev:s,next:a})=>i.jsx(A,{version:dB,title:CB,description:jB,cyfrinLink:AB,html:yB,prev:s,next:a,codes:uB}),bB="0.8.26",wB="Primitive Data Types",kB="Primitive data types",ZB="https://www.cyfrin.io/glossary/primitive-data-types-code-example",WB=[{fileName:"Primitives.sol",code:"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"}],BB=`Here we introduce you to some primitive data types available in Solidity.
booleanuint256You can send Ether to other contracts by
transfer (2300 gas, throws error)Unlike functions, state variables cannot be overridden by re-declaring it +`,NB=({prev:s,next:a})=>i.jsx(A,{version:fB,title:VB,description:YB,cyfrinLink:XB,html:RB,prev:s,next:a,codes:vB}),HB="0.8.26",FB="Shadowing Inherited State Variables",KB="An example of shadowing state variables by inheritance",MB="https://www.cyfrin.io/glossary/shadowing-inherited-state-variables-code-example",SB=[{fileName:"Shadow.sol",code:"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"}],xB=`
Unlike functions, state variables cannot be overridden by re-declaring it in the child contract.
Let's learn how to correctly override inherited state variables.
// SPDX-License-Identifier: MIT
@@ -11761,7 +11831,7 @@ in the child contract.
// C.getName returns "Contract C"
}
-Messages can be signed off chain and then verified on chain using a smart contract.
+`,JB=({prev:s,next:a})=>i.jsx(A,{version:HB,title:FB,description:KB,cyfrinLink:MB,html:xB,prev:s,next:a,codes:SB}),zB="0.8.26",DB="Verifying Signature",EB="An example of how to verify signatures in Solidity",QB="https://www.cyfrin.io/glossary/verifying-signature-code-example",TB=[{fileName:"Signature.sol",code:"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"}],UB=`Messages can be signed off chain and then verified on chain using a smart contract.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -11889,7 +11959,7 @@ How to Sign and Verify
// implicitly return (r, s, v)
}
}
-To write or update a state variable you need to send a transaction.
+`,_B=({prev:s,next:a})=>i.jsx(A,{version:zB,title:DB,description:EB,cyfrinLink:QB,html:UB,prev:s,next:a,codes:TB}),LB="0.8.26",OB="Reading and Writing to a State Variable",PB="Reading and Writing to a State Variable",$B="https://www.cyfrin.io/glossary/reading-and-writing-to-a-state-variable-code-example",qB=[{fileName:"SimpleStorage.sol",code:"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"}],sG=`To write or update a state variable you need to send a transaction.
On the other hand, you can read state variables, for free, without any transaction fee.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -11908,7 +11978,7 @@ How to Sign and Verify
return num;
}
}
-You can define your own type by creating a struct.
You can define your own type by creating a struct.
They are useful for grouping together related data.
Structs can be declared outside of a contract and imported in another contract.
// SPDX-License-Identifier: MIT
@@ -11982,7 +12052,7 @@ How to Sign and Verify
// An array of 'Todo' structs
Todo[] public todos;
}
-Parent contracts can be called directly, or by using the keyword super.
Parent contracts can be called directly, or by using the keyword super.
By using the keyword super, all of the immediate parent contracts will be called.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -12050,7 +12120,7 @@ B C
super.bar();
}
}
-Examples of fuzzing with Echidna.
+`,CG=({prev:s,next:a})=>i.jsx(A,{version:rG,title:iG,description:gG,cyfrinLink:hG,html:dG,prev:s,next:a,codes:IG}),jG="0.8.26",AG="Echidna",uG="An example of testing contracts with Echidna",yG="",mG=[{fileName:"EchidnaTestTimeAndCaller.sol",code:"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"},{fileName:"TestEchidna.sol",code:"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"}],bG=`Examples of fuzzing with Echidna.
TestEchidna.solData stored in transient storage is cleared out after transaction.
+`,wG=({prev:s,next:a})=>i.jsx(A,{version:jG,title:AG,description:uG,cyfrinLink:yG,html:bG,prev:s,next:a,codes:mG}),kG="0.8.26",ZG="Transient Storage",WG="transient storage",BG="https://www.cyfrin.io/glossary/transient-storage-code-example",GG=[{fileName:"TransientStorage.sol",code:"cHJhZ21hIHNvbGlkaXR5IF4wLjguMjY7CgovLyBNYWtlIHN1cmUgRVZNIHZlcnNpb24gYW5kIFZNIHNldCB0byBDYW5jdW4KCi8vIFN0b3JhZ2UgLSBkYXRhIGlzIHN0b3JlZCBvbiB0aGUgYmxvY2tjaGFpbgovLyBNZW1vcnkgLSBkYXRhIGlzIGNsZWFyZWQgb3V0IGFmdGVyIGEgZnVuY3Rpb24gY2FsbAovLyBUcmFuc2llbnQgc3RvcmFnZSAtIGRhdGEgaXMgY2xlYXJlZCBvdXQgYWZ0ZXIgYSB0cmFuc2FjdGlvbgoKaW50ZXJmYWNlIElUZXN0IHsKICAgIGZ1bmN0aW9uIHZhbCgpIGV4dGVybmFsIHZpZXcgcmV0dXJucyAodWludDI1Nik7CiAgICBmdW5jdGlvbiB0ZXN0KCkgZXh0ZXJuYWw7Cn0KCmNvbnRyYWN0IENhbGxiYWNrIHsKICAgIHVpbnQyNTYgcHVibGljIHZhbDsKCiAgICBmYWxsYmFjaygpIGV4dGVybmFsIHsKICAgICAgICB2YWwgPSBJVGVzdChtc2cuc2VuZGVyKS52YWwoKTsKICAgIH0KCiAgICBmdW5jdGlvbiB0ZXN0KGFkZHJlc3MgdGFyZ2V0KSBleHRlcm5hbCB7CiAgICAgICAgSVRlc3QodGFyZ2V0KS50ZXN0KCk7CiAgICB9Cn0KCmNvbnRyYWN0IFRlc3RTdG9yYWdlIHsKICAgIHVpbnQyNTYgcHVibGljIHZhbDsKCiAgICBmdW5jdGlvbiB0ZXN0KCkgcHVibGljIHsKICAgICAgICB2YWwgPSAxMjM7CiAgICAgICAgYnl0ZXMgbWVtb3J5IGIgPSAiIjsKICAgICAgICBtc2cuc2VuZGVyLmNhbGwoYik7CiAgICB9Cn0KCmNvbnRyYWN0IFRlc3RUcmFuc2llbnRTdG9yYWdlIHsKICAgIGJ5dGVzMzIgY29uc3RhbnQgU0xPVCA9IDA7CgogICAgZnVuY3Rpb24gdGVzdCgpIHB1YmxpYyB7CiAgICAgICAgYXNzZW1ibHkgewogICAgICAgICAgICB0c3RvcmUoU0xPVCwgMzIxKQogICAgICAgIH0KICAgICAgICBieXRlcyBtZW1vcnkgYiA9ICIiOwogICAgICAgIG1zZy5zZW5kZXIuY2FsbChiKTsKICAgIH0KCiAgICBmdW5jdGlvbiB2YWwoKSBwdWJsaWMgdmlldyByZXR1cm5zICh1aW50MjU2IHYpIHsKICAgICAgICBhc3NlbWJseSB7CiAgICAgICAgICAgIHYgOj0gdGxvYWQoU0xPVCkKICAgICAgICB9CiAgICB9Cn0KCmNvbnRyYWN0IFJlZW50cmFuY3lHdWFyZCB7CiAgICBib29sIHByaXZhdGUgbG9ja2VkOwoKICAgIG1vZGlmaWVyIGxvY2soKSB7CiAgICAgICAgcmVxdWlyZSghbG9ja2VkKTsKICAgICAgICBsb2NrZWQgPSB0cnVlOwogICAgICAgIF87CiAgICAgICAgbG9ja2VkID0gZmFsc2U7CiAgICB9CgogICAgLy8gMzUzMTMgZ2FzCiAgICBmdW5jdGlvbiB0ZXN0KCkgcHVibGljIGxvY2sgewogICAgICAgIC8vIElnbm9yZSBjYWxsIGVycm9yCiAgICAgICAgYnl0ZXMgbWVtb3J5IGIgPSAiIjsKICAgICAgICBtc2cuc2VuZGVyLmNhbGwoYik7CiAgICB9Cn0KCmNvbnRyYWN0IFJlZW50cmFuY3lHdWFyZFRyYW5zaWVudCB7CiAgICBieXRlczMyIGNvbnN0YW50IFNMT1QgPSAwOwoKICAgIG1vZGlmaWVyIGxvY2soKSB7CiAgICAgICAgYXNzZW1ibHkgewogICAgICAgICAgICBpZiB0bG9hZChTTE9UKSB7IHJldmVydCgwLCAwKSB9CiAgICAgICAgICAgIHRzdG9yZShTTE9ULCAxKQogICAgICAgIH0KICAgICAgICBfOwogICAgICAgIGFzc2VtYmx5IHsKICAgICAgICAgICAgdHN0b3JlKFNMT1QsIDApCiAgICAgICAgfQogICAgfQoKICAgIC8vIDIxODg3IGdhcwogICAgZnVuY3Rpb24gdGVzdCgpIGV4dGVybmFsIGxvY2sgewogICAgICAgIC8vIElnbm9yZSBjYWxsIGVycm9yCiAgICAgICAgYnl0ZXMgbWVtb3J5IGIgPSAiIjsKICAgICAgICBtc2cuc2VuZGVyLmNhbGwoYik7CiAgICB9Cn0K"}],fG=`Data stored in transient storage is cleared out after transaction.
pragma solidity ^0.8.26;
// Make sure EVM version and VM set to Cancun
@@ -12275,7 +12345,7 @@ echidna EchidnaTestTimeAndCaller.sol --contract EchidnaTestTimeAndCaller
msg.sender.call(b);
}
}
-try / catch can only catch errors from external function calls and contract creation.
try / catch can only catch errors from external function calls and contract creation.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -12334,7 +12404,7 @@ echidna EchidnaTestTimeAndCaller.sol --contract EchidnaTestTimeAndCaller
}
}
}
-Overflow and underflow of numbers in Solidity 0.8 throw an error. This can be disabled by using unchecked.
Overflow and underflow of numbers in Solidity 0.8 throw an error. This can be disabled by using unchecked.
Disabling overflow / underflow check saves gas.
// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
@@ -12370,7 +12440,7 @@ echidna EchidnaTestTimeAndCaller.sol --contract EchidnaTestTimeAndCaller
}
}
}
-// SPDX-License-Identifier: MIT
+// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;
// Code copied from optimism
@@ -12456,7 +12526,7 @@ echidna EchidnaTestTimeAndCaller.sol --contract EchidnaTestTimeAndCaller
// clock = LibClock.wrap(t, d);
}
}
-There are 3 types of variables in Solidity
+`,OG=({prev:s,next:a})=>i.jsx(A,{version:EG,title:QG,description:TG,cyfrinLink:UG,html:LG,prev:s,next:a,codes:_G}),PG="0.8.26",$G="Variables",qG="Local, state and global variables",sf="https://www.cyfrin.io/glossary/variables-code-example",af=[{fileName:"Variables.sol",code:"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"}],nf=`There are 3 types of variables in Solidity
Getter functions can be declared view or pure.
Getter functions can be declared view or pure.
View function declares that no state will be changed.
Pure function declares that no state variable will be changed or read.
// SPDX-License-Identifier: MIT
@@ -12581,4 +12651,4 @@ echidna EchidnaTestTimeAndCaller.sol --contract EchidnaTestTimeAndCaller
return internalFunc();
}
}
-