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Contract Name:
FakeFeed
Compiler Version
v0.8.18+commit.87f61d96
Optimization Enabled:
Yes with 1337 runs
Other Settings:
default evmVersion
Contract Source Code (Solidity Standard Json-Input format)
// SPDX-License-Identifier: UNKNOWN
pragma solidity 0.8.18;
import { IChainlinkAggregatorV3 } from "./diamond/interfaces/IChainlinkAggregatorV3.sol";
import { LibPRNG } from "solady/src/utils/LibPRNG.sol";
contract FakeFeed is IChainlinkAggregatorV3 {
function latestRoundData()
external
view
override
returns (
uint80 roundId,
int256 answer,
uint256 startedAt,
uint256 updatedAt,
uint80 answeredInRound
)
{
LibPRNG.PRNG memory rnd = LibPRNG.PRNG(0);
LibPRNG.seed(rnd, block.timestamp);
return (
uint80(1),
int256(1 ether / (10 ** 10)) + int256((0.5 ether - LibPRNG.standardNormalWad(rnd)) / (10 ** 10)),
block.timestamp,
block.timestamp,
uint80(1)
);
}
}// SPDX-License-Identifier: UNKNOWN
pragma solidity 0.8.18;
interface IChainlinkAggregatorV3 {
function latestRoundData()
external
view
returns (uint80 roundId, int256 answer, uint256 startedAt, uint256 updatedAt, uint80 answeredInRound);
}// SPDX-License-Identifier: MIT
pragma solidity ^0.8.4;
/// @notice Library for generating pseudorandom numbers.
/// @author Solady (https://github.com/vectorized/solady/blob/main/src/utils/LibPRNG.sol)
/// @author LazyShuffler based on NextShuffler by aschlosberg (divergencearran)
/// (https://github.com/divergencetech/ethier/blob/main/contracts/random/NextShuffler.sol)
library LibPRNG {
/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
/* CUSTOM ERRORS */
/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
/// @dev The initial length must be greater than zero and less than `2**32 - 1`.
error InvalidInitialLazyShufflerLength();
/// @dev The new length must not be less than the current length.
error InvalidNewLazyShufflerLength();
/// @dev The lazy shuffler has not been initialized.
error LazyShufflerNotInitialized();
/// @dev Cannot double initialize the lazy shuffler.
error LazyShufflerAlreadyInitialized();
/// @dev The lazy shuffle has finished.
error LazyShuffleFinished();
/// @dev The queried index is out of bounds.
error LazyShufflerGetOutOfBounds();
/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
/* CONSTANTS */
/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
/// @dev The scalar of ETH and most ERC20s.
uint256 internal constant WAD = 1e18;
/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
/* STRUCTS */
/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
/// @dev A pseudorandom number state in memory.
struct PRNG {
uint256 state;
}
/// @dev A lazy Fisher-Yates shuffler for a range `[0..n)` in storage.
struct LazyShuffler {
// Bits Layout:
// - [0..31] `numShuffled`
// - [32..223] `permutationSlot`
// - [224..255] `length`
uint256 _state;
}
/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
/* OPERATIONS */
/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
/// @dev Seeds the `prng` with `state`.
function seed(PRNG memory prng, uint256 state) internal pure {
/// @solidity memory-safe-assembly
assembly {
mstore(prng, state)
}
}
/// @dev Returns the next pseudorandom uint256.
/// All bits of the returned uint256 pass the NIST Statistical Test Suite.
function next(PRNG memory prng) internal pure returns (uint256 result) {
// We simply use `keccak256` for a great balance between
// runtime gas costs, bytecode size, and statistical properties.
//
// A high-quality LCG with a 32-byte state
// is only about 30% more gas efficient during runtime,
// but requires a 32-byte multiplier, which can cause bytecode bloat
// when this function is inlined.
//
// Using this method is about 2x more efficient than
// `nextRandomness = uint256(keccak256(abi.encode(randomness)))`.
/// @solidity memory-safe-assembly
assembly {
result := keccak256(prng, 0x20)
mstore(prng, result)
}
}
/// @dev Returns a pseudorandom uint256, uniformly distributed
/// between 0 (inclusive) and `upper` (exclusive).
/// If your modulus is big, this method is recommended
/// for uniform sampling to avoid modulo bias.
/// For uniform sampling across all uint256 values,
/// or for small enough moduli such that the bias is negligible,
/// use {next} instead.
function uniform(PRNG memory prng, uint256 upper) internal pure returns (uint256 result) {
/// @solidity memory-safe-assembly
assembly {
for {} 1 {} {
result := keccak256(prng, 0x20)
mstore(prng, result)
if iszero(lt(result, mod(sub(0, upper), upper))) { break }
}
result := mod(result, upper)
}
}
/// @dev Returns a sample from the standard normal distribution denominated in `WAD`.
function standardNormalWad(PRNG memory prng) internal pure returns (int256 result) {
/// @solidity memory-safe-assembly
assembly {
// Technically, this is the Irwin-Hall distribution with 20 samples.
// The chance of drawing a sample outside 10 σ from the standard normal distribution
// is ≈ 0.000000000000000000000015, which is insignificant for most practical purposes.
// Passes the Kolmogorov-Smirnov test for 200k samples. Uses about 322 gas.
result := keccak256(prng, 0x20)
mstore(prng, result)
let n := 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff43 // Prime.
let a := 0x100000000000000000000000000000051 // Prime and a primitive root of `n`.
let m := 0x1fffffffffffffff1fffffffffffffff1fffffffffffffff1fffffffffffffff
let s := 0x1000000000000000100000000000000010000000000000001
let r1 := mulmod(result, a, n)
let r2 := mulmod(r1, a, n)
let r3 := mulmod(r2, a, n)
// forgefmt: disable-next-item
result := sub(sar(96, mul(26614938895861601847173011183,
add(add(shr(192, mul(s, add(and(m, result), and(m, r1)))),
shr(192, mul(s, add(and(m, r2), and(m, r3))))),
shr(192, mul(s, and(m, mulmod(r3, a, n))))))), 7745966692414833770)
}
}
/// @dev Returns a sample from the unit exponential distribution denominated in `WAD`.
function exponentialWad(PRNG memory prng) internal pure returns (uint256 result) {
/// @solidity memory-safe-assembly
assembly {
// Passes the Kolmogorov-Smirnov test for 200k samples.
// Gas usage varies, starting from about 172+ gas.
let r := keccak256(prng, 0x20)
mstore(prng, r)
let p := shl(129, r)
let w := shl(1, r)
if iszero(gt(w, p)) {
let n := 0xffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff43 // Prime.
let a := 0x100000000000000000000000000000051 // Prime and a primitive root of `n`.
for {} 1 {} {
r := mulmod(r, a, n)
if iszero(lt(shl(129, r), w)) {
r := mulmod(r, a, n)
result := add(1000000000000000000, result)
w := shl(1, r)
p := shl(129, r)
if iszero(lt(w, p)) { break }
continue
}
w := shl(1, r)
if iszero(lt(w, shl(129, r))) { break }
}
}
result := add(div(p, shl(129, 170141183460469231732)), result)
}
}
/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
/* MEMORY ARRAY SHUFFLING OPERATIONS */
/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
/// @dev Shuffles the array in-place with Fisher-Yates shuffle.
function shuffle(PRNG memory prng, uint256[] memory a) internal pure {
/// @solidity memory-safe-assembly
assembly {
let n := mload(a)
let w := not(0)
let mask := shr(128, w)
if n {
for { a := add(a, 0x20) } 1 {} {
// We can just directly use `keccak256`, cuz
// the other approaches don't save much.
let r := keccak256(prng, 0x20)
mstore(prng, r)
// Note that there will be a very tiny modulo bias
// if the length of the array is not a power of 2.
// For all practical purposes, it is negligible
// and will not be a fairness or security concern.
{
let j := add(a, shl(5, mod(shr(128, r), n)))
n := add(n, w) // `sub(n, 1)`.
if iszero(n) { break }
let i := add(a, shl(5, n))
let t := mload(i)
mstore(i, mload(j))
mstore(j, t)
}
{
let j := add(a, shl(5, mod(and(r, mask), n)))
n := add(n, w) // `sub(n, 1)`.
if iszero(n) { break }
let i := add(a, shl(5, n))
let t := mload(i)
mstore(i, mload(j))
mstore(j, t)
}
}
}
}
}
/// @dev Shuffles the array in-place with Fisher-Yates shuffle.
function shuffle(PRNG memory prng, int256[] memory a) internal pure {
shuffle(prng, _toUints(a));
}
/// @dev Shuffles the array in-place with Fisher-Yates shuffle.
function shuffle(PRNG memory prng, address[] memory a) internal pure {
shuffle(prng, _toUints(a));
}
/// @dev Partially shuffles the array in-place with Fisher-Yates shuffle.
/// The first `k` elements will be uniformly sampled without replacement.
function shuffle(PRNG memory prng, uint256[] memory a, uint256 k) internal pure {
/// @solidity memory-safe-assembly
assembly {
let n := mload(a)
k := xor(k, mul(xor(k, n), lt(n, k))) // `min(n, k)`.
if k {
let mask := shr(128, not(0))
let b := 0
for { a := add(a, 0x20) } 1 {} {
// We can just directly use `keccak256`, cuz
// the other approaches don't save much.
let r := keccak256(prng, 0x20)
mstore(prng, r)
// Note that there will be a very tiny modulo bias
// if the length of the array is not a power of 2.
// For all practical purposes, it is negligible
// and will not be a fairness or security concern.
{
let j := add(a, shl(5, add(b, mod(shr(128, r), sub(n, b)))))
let i := add(a, shl(5, b))
let t := mload(i)
mstore(i, mload(j))
mstore(j, t)
b := add(b, 1)
if eq(b, k) { break }
}
{
let j := add(a, shl(5, add(b, mod(and(r, mask), sub(n, b)))))
let i := add(a, shl(5, b))
let t := mload(i)
mstore(i, mload(j))
mstore(j, t)
b := add(b, 1)
if eq(b, k) { break }
}
}
}
}
}
/// @dev Partially shuffles the array in-place with Fisher-Yates shuffle.
/// The first `k` elements will be uniformly sampled without replacement.
function shuffle(PRNG memory prng, int256[] memory a, uint256 k) internal pure {
shuffle(prng, _toUints(a), k);
}
/// @dev Partially shuffles the array in-place with Fisher-Yates shuffle.
/// The first `k` elements will be uniformly sampled without replacement.
function shuffle(PRNG memory prng, address[] memory a, uint256 k) internal pure {
shuffle(prng, _toUints(a), k);
}
/// @dev Shuffles the bytes in-place with Fisher-Yates shuffle.
function shuffle(PRNG memory prng, bytes memory a) internal pure {
/// @solidity memory-safe-assembly
assembly {
let n := mload(a)
let w := not(0)
let mask := shr(128, w)
if n {
let b := add(a, 0x01)
for { a := add(a, 0x20) } 1 {} {
// We can just directly use `keccak256`, cuz
// the other approaches don't save much.
let r := keccak256(prng, 0x20)
mstore(prng, r)
// Note that there will be a very tiny modulo bias
// if the length of the array is not a power of 2.
// For all practical purposes, it is negligible
// and will not be a fairness or security concern.
{
let o := mod(shr(128, r), n)
n := add(n, w) // `sub(n, 1)`.
if iszero(n) { break }
let t := mload(add(b, n))
mstore8(add(a, n), mload(add(b, o)))
mstore8(add(a, o), t)
}
{
let o := mod(and(r, mask), n)
n := add(n, w) // `sub(n, 1)`.
if iszero(n) { break }
let t := mload(add(b, n))
mstore8(add(a, n), mload(add(b, o)))
mstore8(add(a, o), t)
}
}
}
}
}
/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
/* STORAGE-BASED RANGE LAZY SHUFFLING OPERATIONS */
/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
/// @dev Initializes the state for lazy-shuffling the range `[0..n)`.
/// Reverts if `n == 0 || n >= 2**32 - 1`.
/// Reverts if `$` has already been initialized.
/// If you need to reduce the length after initialization, just use a fresh new `$`.
function initialize(LazyShuffler storage $, uint256 n) internal {
/// @solidity memory-safe-assembly
assembly {
if iszero(lt(sub(n, 1), 0xfffffffe)) {
mstore(0x00, 0x83b53941) // `InvalidInitialLazyShufflerLength()`.
revert(0x1c, 0x04)
}
if sload($.slot) {
mstore(0x00, 0x0c9f11f2) // `LazyShufflerAlreadyInitialized()`.
revert(0x1c, 0x04)
}
mstore(0x00, $.slot)
sstore($.slot, or(shl(224, n), shl(32, shr(64, keccak256(0x00, 0x20)))))
}
}
/// @dev Increases the length of `$`.
/// Reverts if `$` has not been initialized.
function grow(LazyShuffler storage $, uint256 n) internal {
/// @solidity memory-safe-assembly
assembly {
let state := sload($.slot) // The packed value at `$`.
// If the new length is smaller than the old length, revert.
if lt(n, shr(224, state)) {
mstore(0x00, 0xbed37c6e) // `InvalidNewLazyShufflerLength()`.
revert(0x1c, 0x04)
}
if iszero(state) {
mstore(0x00, 0x1ead2566) // `LazyShufflerNotInitialized()`.
revert(0x1c, 0x04)
}
sstore($.slot, or(shl(224, n), shr(32, shl(32, state))))
}
}
/// @dev Restarts the shuffler by setting `numShuffled` to zero,
/// such that all elements can be drawn again.
/// Restarting does NOT clear the internal permutation, nor changes the length.
/// Even with the same sequence of randomness, reshuffling can yield different results.
function restart(LazyShuffler storage $) internal {
/// @solidity memory-safe-assembly
assembly {
let state := sload($.slot)
if iszero(state) {
mstore(0x00, 0x1ead2566) // `LazyShufflerNotInitialized()`.
revert(0x1c, 0x04)
}
sstore($.slot, shl(32, shr(32, state)))
}
}
/// @dev Returns the number of elements that have been shuffled.
function numShuffled(LazyShuffler storage $) internal view returns (uint256 result) {
/// @solidity memory-safe-assembly
assembly {
result := and(0xffffffff, sload($.slot))
}
}
/// @dev Returns the length of `$`.
/// Returns zero if `$` is not initialized, else a non-zero value less than `2**32 - 1`.
function length(LazyShuffler storage $) internal view returns (uint256 result) {
/// @solidity memory-safe-assembly
assembly {
result := shr(224, sload($.slot))
}
}
/// @dev Returns if `$` has been initialized.
function initialized(LazyShuffler storage $) internal view returns (bool result) {
/// @solidity memory-safe-assembly
assembly {
result := iszero(iszero(sload($.slot)))
}
}
/// @dev Returns if there are any more elements left to shuffle.
/// Reverts if `$` is not initialized.
function finished(LazyShuffler storage $) internal view returns (bool result) {
/// @solidity memory-safe-assembly
assembly {
let state := sload($.slot) // The packed value at `$`.
if iszero(state) {
mstore(0x00, 0x1ead2566) // `LazyShufflerNotInitialized()`.
revert(0x1c, 0x04)
}
result := eq(shr(224, state), and(0xffffffff, state))
}
}
/// @dev Returns the current value stored at `index`, accounting for all historical shuffling.
/// Reverts if `index` is greater than or equal to the `length` of `$`.
function get(LazyShuffler storage $, uint256 index) internal view returns (uint256 result) {
/// @solidity memory-safe-assembly
assembly {
let state := sload($.slot) // The packed value at `$`.
let n := shr(224, state) // Length of `$`.
if iszero(lt(index, n)) {
mstore(0x00, 0x61367cc4) // `LazyShufflerGetOutOfBounds()`.
revert(0x1c, 0x04)
}
let u32 := gt(n, 0xfffe)
let s := add(shr(sub(4, u32), index), shr(64, shl(32, state))) // Bucket slot.
let o := shl(add(4, u32), and(index, shr(u32, 15))) // Bucket slot offset (bits).
let m := sub(shl(shl(u32, 16), 1), 1) // Value mask.
result := and(m, shr(o, sload(s)))
result := xor(index, mul(xor(index, sub(result, 1)), iszero(iszero(result))))
}
}
/// @dev Does a single Fisher-Yates shuffle step, increments the `numShuffled` in `$`,
/// and returns the next value in the shuffled range.
/// `randomness` can be taken from a good-enough source, or a higher quality source like VRF.
/// Reverts if there are no more values to shuffle, which includes the case if `$` is not initialized.
function next(LazyShuffler storage $, uint256 randomness) internal returns (uint256 chosen) {
/// @solidity memory-safe-assembly
assembly {
function _get(u32_, state_, i_) -> _value {
let s_ := add(shr(sub(4, u32_), i_), shr(64, shl(32, state_))) // Bucket slot.
let o_ := shl(add(4, u32_), and(i_, shr(u32_, 15))) // Bucket slot offset (bits).
let m_ := sub(shl(shl(u32_, 16), 1), 1) // Value mask.
_value := and(m_, shr(o_, sload(s_)))
_value := xor(i_, mul(xor(i_, sub(_value, 1)), iszero(iszero(_value))))
}
function _set(u32_, state_, i_, value_) {
let s_ := add(shr(sub(4, u32_), i_), shr(64, shl(32, state_))) // Bucket slot.
let o_ := shl(add(4, u32_), and(i_, shr(u32_, 15))) // Bucket slot offset (bits).
let m_ := sub(shl(shl(u32_, 16), 1), 1) // Value mask.
let v_ := sload(s_) // Bucket slot value.
value_ := mul(iszero(eq(i_, value_)), add(value_, 1))
sstore(s_, xor(v_, shl(o_, and(m_, xor(shr(o_, v_), value_)))))
}
let state := sload($.slot) // The packed value at `$`.
let shuffled := and(0xffffffff, state) // Number of elements shuffled.
let n := shr(224, state) // Length of `$`.
let remainder := sub(n, shuffled) // Number of elements left to shuffle.
if iszero(remainder) {
mstore(0x00, 0x51065f79) // `LazyShuffleFinished()`.
revert(0x1c, 0x04)
}
mstore(0x00, randomness) // (Re)hash the randomness so that we don't
mstore(0x20, shuffled) // need to expect guarantees on its distribution.
let index := add(mod(keccak256(0x00, 0x40), remainder), shuffled)
chosen := _get(gt(n, 0xfffe), state, index)
_set(gt(n, 0xfffe), state, index, _get(gt(n, 0xfffe), state, shuffled))
_set(gt(n, 0xfffe), state, shuffled, chosen)
sstore($.slot, add(1, state)) // Increment the `numShuffled` by 1, and store it.
}
}
/*´:°•.°+.*•´.*:˚.°*.˚•´.°:°•.°•.*•´.*:˚.°*.˚•´.°:°•.°+.*•´.*:*/
/* PRIVATE HELPERS */
/*.•°:°.´+˚.*°.˚:*.´•*.+°.•°:´*.´•*.•°.•°:°.´:•˚°.*°.˚:*.´+°.•*/
/// @dev Reinterpret cast to an uint256 array.
function _toUints(int256[] memory a) private pure returns (uint256[] memory casted) {
/// @solidity memory-safe-assembly
assembly {
casted := a
}
}
/// @dev Reinterpret cast to an uint256 array.
function _toUints(address[] memory a) private pure returns (uint256[] memory casted) {
/// @solidity memory-safe-assembly
assembly {
// As any address written to memory will have the upper 96 bits
// of the word zeroized (as per Solidity spec), we can directly
// compare these addresses as if they are whole uint256 words.
casted := a
}
}
}{
"optimizer": {
"enabled": true,
"runs": 1337
},
"viaIR": true,
"outputSelection": {
"*": {
"*": [
"evm.bytecode",
"evm.deployedBytecode",
"devdoc",
"userdoc",
"metadata",
"abi"
]
}
},
"libraries": {}
}Contract Security Audit
- No Contract Security Audit Submitted- Submit Audit Here
[{"inputs":[],"name":"latestRoundData","outputs":[{"internalType":"uint80","name":"roundId","type":"uint80"},{"internalType":"int256","name":"answer","type":"int256"},{"internalType":"uint256","name":"startedAt","type":"uint256"},{"internalType":"uint256","name":"updatedAt","type":"uint256"},{"internalType":"uint80","name":"answeredInRound","type":"uint80"}],"stateMutability":"view","type":"function"}]Contract Creation Code
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Deployed Bytecode
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Multichain Portfolio | 30 Chains
| Chain | Token | Portfolio % | Price | Amount | Value |
|---|
A contract address hosts a smart contract, which is a set of code stored on the blockchain that runs when predetermined conditions are met. Learn more about addresses in our Knowledge Base.