Liquidation Improvements based on Health-Factor #535
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Contributor
There was a problem hiding this comment. I would avoid changes in the VToken contract, if it's doable. Because vBNB cannot be upgraded |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| // SPDX-License-Identifier: BSD-3-Clause | ||
| pragma solidity 0.8.25; | ||
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| import { EXP_SCALE as EXP_SCALE_, MANTISSA_ONE as MANTISSA_ONE_ } from "./constants.sol"; | ||
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| library ExponentialNoError { | ||
| struct Exp { | ||
| uint256 mantissa; | ||
| } | ||
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| struct Double { | ||
| uint256 mantissa; | ||
| } | ||
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| uint256 internal constant EXP_SCALE = EXP_SCALE_; | ||
| uint256 internal constant DOUBLE_SCALE = 1e36; | ||
| uint256 internal constant HALF_EXP_SCALE = EXP_SCALE / 2; | ||
| uint256 internal constant MANTISSA_ONE = MANTISSA_ONE_; | ||
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| function truncate(Exp memory exp) internal pure returns (uint256) { | ||
| return exp.mantissa / EXP_SCALE; | ||
| } | ||
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| function mul_ScalarTruncate(Exp memory a, uint256 scalar) internal pure returns (uint256) { | ||
| Exp memory product = mul_(a, scalar); | ||
| return truncate(product); | ||
| } | ||
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| function mul_ScalarTruncateAddUInt(Exp memory a, uint256 scalar, uint256 addend) internal pure returns (uint256) { | ||
| Exp memory product = mul_(a, scalar); | ||
| return add_(truncate(product), addend); | ||
| } | ||
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| function lessThanExp(Exp memory left, Exp memory right) internal pure returns (bool) { | ||
| return left.mantissa < right.mantissa; | ||
| } | ||
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| function safe224(uint256 n, string memory errorMessage) internal pure returns (uint224) { | ||
| require(n <= type(uint224).max, errorMessage); | ||
| return uint224(n); | ||
| } | ||
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| function safe32(uint256 n, string memory errorMessage) internal pure returns (uint32) { | ||
| require(n <= type(uint32).max, errorMessage); | ||
| return uint32(n); | ||
| } | ||
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| function add_(Exp memory a, Exp memory b) internal pure returns (Exp memory) { | ||
| return Exp(add_(a.mantissa, b.mantissa)); | ||
| } | ||
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| function add_(Double memory a, Double memory b) internal pure returns (Double memory) { | ||
| return Double(add_(a.mantissa, b.mantissa)); | ||
| } | ||
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| function add_(uint256 a, uint256 b) internal pure returns (uint256) { | ||
| return a + b; | ||
| } | ||
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| function sub_(Exp memory a, Exp memory b) internal pure returns (Exp memory) { | ||
| return Exp(sub_(a.mantissa, b.mantissa)); | ||
| } | ||
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| function sub_(Double memory a, Double memory b) internal pure returns (Double memory) { | ||
| return Double(sub_(a.mantissa, b.mantissa)); | ||
| } | ||
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| function sub_(uint256 a, uint256 b) internal pure returns (uint256) { | ||
| return a - b; | ||
| } | ||
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| function mul_(Exp memory a, Exp memory b) internal pure returns (Exp memory) { | ||
| return Exp(mul_(a.mantissa, b.mantissa) / EXP_SCALE); | ||
| } | ||
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| function mul_(Exp memory a, uint256 b) internal pure returns (Exp memory) { | ||
| return Exp(mul_(a.mantissa, b)); | ||
| } | ||
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| function mul_(uint256 a, Exp memory b) internal pure returns (uint256) { | ||
| return mul_(a, b.mantissa) / EXP_SCALE; | ||
| } | ||
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| function mul_(Double memory a, Double memory b) internal pure returns (Double memory) { | ||
| return Double(mul_(a.mantissa, b.mantissa) / DOUBLE_SCALE); | ||
| } | ||
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| function mul_(Double memory a, uint256 b) internal pure returns (Double memory) { | ||
| return Double(mul_(a.mantissa, b)); | ||
| } | ||
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| function mul_(uint256 a, Double memory b) internal pure returns (uint256) { | ||
| return mul_(a, b.mantissa) / DOUBLE_SCALE; | ||
| } | ||
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| function mul_(uint256 a, uint256 b) internal pure returns (uint256) { | ||
| return a * b; | ||
| } | ||
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| function div_(Exp memory a, Exp memory b) internal pure returns (Exp memory) { | ||
| return Exp(div_(mul_(a.mantissa, EXP_SCALE), b.mantissa)); | ||
| } | ||
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| function div_(Exp memory a, uint256 b) internal pure returns (Exp memory) { | ||
| return Exp(div_(a.mantissa, b)); | ||
| } | ||
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| function div_(uint256 a, Exp memory b) internal pure returns (uint256) { | ||
| return div_(mul_(a, EXP_SCALE), b.mantissa); | ||
| } | ||
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| function div_(Double memory a, Double memory b) internal pure returns (Double memory) { | ||
| return Double(div_(mul_(a.mantissa, DOUBLE_SCALE), b.mantissa)); | ||
| } | ||
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| function div_(Double memory a, uint256 b) internal pure returns (Double memory) { | ||
| return Double(div_(a.mantissa, b)); | ||
| } | ||
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| function div_(uint256 a, Double memory b) internal pure returns (uint256) { | ||
| return div_(mul_(a, DOUBLE_SCALE), b.mantissa); | ||
| } | ||
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| function div_(uint256 a, uint256 b) internal pure returns (uint256) { | ||
| return a / b; | ||
| } | ||
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| function fraction(uint256 a, uint256 b) internal pure returns (Double memory) { | ||
| return Double(div_(mul_(a, DOUBLE_SCALE), b)); | ||
| } | ||
| } |
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525f1cf