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HEVMHelpers.sol
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HEVMHelpers.sol
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pragma solidity >=0.5.15;
import { DSTest } from "./test.sol";
import { IERC20 } from "./IERC20.sol";
import "./HEVMState.sol";
contract HEVMHelpers is HEVMState, DSTest {
event Debug(uint, bytes32);
event SlotFound(address who, string sig, uint slot);
event Logger(uint, bytes);
function sigs(
string memory sig
)
public
pure
returns (bytes4)
{
return bytes4(keccak256(bytes(sig)));
}
/// @notice find an arbitrary storage slot given a function sig, input data, address of the contract and a value to check against
// slot complexity:
// if flat, will be bytes32(uint256(uint));
// if map, will be keccak256(abi.encode(key, uint(slot)));
// if deep map, will be keccak256(abi.encode(key1, keccak256(abi.encode(key0, uint(slot)))));
// if map struct, will be bytes32(uint256(keccak256(abi.encode(key1, keccak256(abi.encode(key0, uint(slot)))))) + structFieldDepth);
function find(
string memory sig, // signature to check agains
bytes32[] memory ins, // see slot complexity
address who, // contract
bytes32 set
) public {
// calldata to test against
bytes4 fsig = bytes4(keccak256(bytes(sig)));
bytes memory dat = flatten(ins);
bytes memory cald = abi.encodePacked(fsig, dat);
// iterate thru slots
for (uint256 i = 0; i < 30; i++) {
bytes32 slot;
if (ins.length > 0) {
for (uint256 j = 0; j < ins.length; j++) {
if (j != 0) {
slot = keccak256(abi.encode(ins[j], slot));
} else {
slot = keccak256(abi.encode(ins[j], uint(i)));
}
}
} else {
// no ins, so should be flat
slot = bytes32(i);
}
// load slot
bytes32 prev = hevm.load(who, slot);
// store
hevm.store(who, slot, set);
// call
(bool pass, bytes memory rdat) = who.staticcall(cald);
pass; // ssh
bytes32 fdat = bytesToBytes32(rdat, 0);
// check if good
if (fdat == set) {
slots[who][fsig] = i;
finds[who][fsig] = true;
hevm.store(who, slot, prev);
emit SlotFound(who, sig, i);
break;
}
// reset storage
hevm.store(who, slot, prev);
}
require(finds[who][fsig], "!found");
}
/// @notice write to an arbitrary slot given a function signature
function writ(
string memory sig, // signature to check agains
bytes32[] memory ins, // see slot complexity
uint256 depth, // see slot complexity
address who, // contract
bytes32 set // value to set storage as
) public {
bytes4 fsig = sigs(sig);
require(finds[who][fsig], "!found");
bytes32 slot;
if (ins.length > 0) {
for (uint256 j = 0; j < ins.length; j++) {
if (j != 0) {
slot = keccak256(abi.encode(ins[j], slot));
} else {
slot = keccak256(abi.encode(ins[j], slots[who][fsig]));
}
}
} else {
// no ins, so should be flat
slot = bytes32(slots[who][fsig]);
}
// add depth -- noop if 0
slot = bytes32(uint256(slot) + depth);
// set storage
hevm.store(who, slot, set);
}
function write_flat(address who, string memory sig, uint256 value) public {
bytes32[] memory ins = new bytes32[](0);
if (!finds[who][sigs(sig)]) {
find(
sig,
ins,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
ins,
0,
who,
bytes32(value)
);
}
function write_flat(address who, string memory sig, address value) public {
bytes32[] memory ins = new bytes32[](0);
if (!finds[who][sigs(sig)]) {
find(
sig,
ins,
who,
bytes32(uint256(0xaaaCfBec6a24756c20D41914f2CABA817C0d8521))
);
}
writ(
sig,
ins,
0,
who,
bytes32(uint256(value))
);
}
function write_map(address who, string memory sig, uint256 key, uint256 value) public {
bytes32[] memory keys = new bytes32[](1);
keys[0] = bytes32(uint256(key));
if (!finds[who][sigs(sig)]) {
find(
sig,
keys,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
keys,
0,
who,
bytes32(value)
);
}
function write_map(address who, string memory sig, uint256 key, address value) public {
bytes32[] memory keys = new bytes32[](1);
keys[0] = bytes32(uint256(key));
if (!finds[who][sigs(sig)]) {
find(
sig,
keys,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
keys,
0,
who,
bytes32(uint256(value))
);
}
function write_map(address who, string memory sig, address key, uint256 value) public {
bytes32[] memory keys = new bytes32[](1);
keys[0] = bytes32(uint256(key));
if (!finds[who][sigs(sig)]) {
find(
sig,
keys,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
keys,
0,
who,
bytes32(value)
);
}
function write_map(address who, string memory sig, address key, address value) public {
bytes32[] memory keys = new bytes32[](1);
keys[0] = bytes32(uint256(key));
if (!finds[who][sigs(sig)]) {
find(
sig,
keys,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
keys,
0,
who,
bytes32(uint256(value))
);
}
function write_deep_map(address who, string memory sig, bytes32[] memory keys, uint256 value) public {
if (!finds[who][sigs(sig)]) {
find(
sig,
keys,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
keys,
0,
who,
bytes32(value)
);
}
function write_deep_map(address who, string memory sig, bytes32[] memory keys, address value) public {
if (!finds[who][sigs(sig)]) {
find(
sig,
keys,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
keys,
0,
who,
bytes32(uint256(value))
);
}
function write_deep_map_struct(address who, string memory sig, bytes32[] memory keys, uint256 value, uint256 depth) public {
if (!finds[who][sigs(sig)]) {
find(
sig,
keys,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
keys,
depth,
who,
bytes32(value)
);
}
function write_deep_map_struct(address who, string memory sig, bytes32[] memory keys, address value, uint256 depth) public {
if (!finds[who][sigs(sig)]) {
find(
sig,
keys,
who,
bytes32(uint256(13371337))
);
}
writ(
sig,
keys,
depth,
who,
bytes32(uint256(value))
);
}
function bytesToBytes32(bytes memory b, uint offset) private pure returns (bytes32) {
bytes32 out;
for (uint i = 0; i < 32; i++) {
out |= bytes32(b[offset + i] & 0xFF) >> (i * 8);
}
return out;
}
function flatten(bytes32[] memory b) public pure returns (bytes memory)
{
bytes memory result = new bytes(b.length * 32);
for (uint256 i = 0; i < b.length; i++) {
bytes32 k = b[i];
assembly {
mstore(add(result, add(32, mul(32, i))), k)
}
}
return result;
}
// call this to speed up on known storage slots. See SlotFound and add to setup()
function addKnownHEVM(address who, bytes4 fsig, uint slot) public {
slots[who][fsig] = slot;
finds[who][fsig] = true;
}
}