bug(cheatcodes): memory not deallocating after snapshot revertTo

[Akbar30Bill]

Component

Forge

Have you ensured that all of these are up to date?

• Foundry
• Foundryup

What version of Foundry are you on?

forge 0.2.0 (a117fbf 2024-05-13T00:22:16.352837000Z)

What command(s) is the bug in?

forge script script/testSnapshot.sol

Operating System

macOS (Apple Silicon)

Describe the bug

Description:
As suggested in the Foundry book, the snapshots that are reverted should be deleted from memory. However, my script demonstrates that this is not the case, as the memory usage keeps growing.

I wrote a simple Forge script to illustrate this behavior. You can run the script and observe the increasing memory usage during execution:

pragma solidity ^0.8.25;

import {Script, console2} from "forge-std/Script.sol";

contract testSnapshot is Script {
    function run() public {
        for (uint256 i = 0; i < 1000000; i++) {
            console2.log("Snapshot number: ", i);
            uint256 snapshot = vm.snapshot();
            vm.revertTo(snapshot);
        }
    }

    function setUp() public {}
}

Expected Behavior:
After reverting to a snapshot, the memory allocated for that snapshot should be cleaned up or deallocated to prevent memory bloat.

Actual Behavior:
The memory usage continues to grow with each snapshot taken, even after it has been reverted.

Environment:

• Solidity version: 0.8.25
• Forge version: 0.2.0 (a117fbf 2024-05-13T00:22:16.352837000Z)

Steps to Reproduce:

1. Run the provided script.
2. Monitor the memory usage throughout the execution.

Please investigate this issue to confirm whether the snapshots are not being properly deallocated from memory.