48 lines
1.7 KiB
Solidity
48 lines
1.7 KiB
Solidity
// SPDX-License-Identifier: UNLICENSED
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pragma solidity =0.7.6;
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import '../libraries/TickBitmap.sol';
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contract TickBitmapEchidnaTest {
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using TickBitmap for mapping(int16 => uint256);
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mapping(int16 => uint256) private bitmap;
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// returns whether the given tick is initialized
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function isInitialized(int24 tick) private view returns (bool) {
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(int24 next, bool initialized) = bitmap.nextInitializedTickWithinOneWord(tick, 1, true);
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return next == tick ? initialized : false;
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}
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function flipTick(int24 tick) external {
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bool before = isInitialized(tick);
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bitmap.flipTick(tick, 1);
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assert(isInitialized(tick) == !before);
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}
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function checkNextInitializedTickWithinOneWordInvariants(int24 tick, bool lte) external view {
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(int24 next, bool initialized) = bitmap.nextInitializedTickWithinOneWord(tick, 1, lte);
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if (lte) {
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// type(int24).min + 256
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require(tick >= -8388352);
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assert(next <= tick);
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assert(tick - next < 256);
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// all the ticks between the input tick and the next tick should be uninitialized
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for (int24 i = tick; i > next; i--) {
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assert(!isInitialized(i));
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}
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assert(isInitialized(next) == initialized);
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} else {
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// type(int24).max - 256
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require(tick < 8388351);
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assert(next > tick);
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assert(next - tick <= 256);
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// all the ticks between the input tick and the next tick should be uninitialized
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for (int24 i = tick + 1; i < next; i++) {
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assert(!isInitialized(i));
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}
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assert(isInitialized(next) == initialized);
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}
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}
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}
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