evm 101

contracts/zero-ex/contracts/test/foundry/protocol-academy/8-evm/Counter.t.sol

@@ -0,0 +1,30 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2022 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6;
+pragma experimental ABIEncoderV2;
+
+contract Counter {
+    uint256 private data = 1337;
+
+    function increment(uint256 val) public {
+      // forge debug contracts/test/foundry/protocol-academy/8-evm/Counter.t.sol --sig 'increment(uint256)' 10
+      data += val;
+    }
+}

contracts/zero-ex/contracts/test/foundry/protocol-academy/8-evm/Hash.t.sol

@@ -0,0 +1,42 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2022 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6;
+pragma experimental ABIEncoderV2;
+
+contract Hash {
+    bytes data = hex"42";
+
+    function sha3() public {
+        // forge debug contracts/test/foundry/protocol-academy/8-evm/Hash.sol --sig 'sha3()'
+
+        // Follow the opcodes:
+        //   how does the data get loaded
+        //   which one is keccak256
+        keccak256(data);
+    }
+
+    function sha2() public {
+        // forge debug contracts/test/foundry/protocol-academy/8-evm/Hash.sol --sig 'sha2()'
+
+        // Follow the opcodes:
+        //   why is sha256 so different from keccak256
+        sha256(data);
+    }
+}

contracts/zero-ex/contracts/test/foundry/protocol-academy/8-evm/Memory.sol

@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: Apache-2.0
+/*
+
+  Copyright 2022 ZeroEx Intl.
+
+  Licensed under the Apache License, Version 2.0 (the "License");
+  you may not use this file except in compliance with the License.
+  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing, software
+  distributed under the License is distributed on an "AS IS" BASIS,
+  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  See the License for the specific language governing permissions and
+  limitations under the License.
+
+*/
+
+pragma solidity ^0.6;
+pragma experimental ABIEncoderV2;
+
+contract Memory {
+
+    function expand() public {
+      // forge debug contracts/test/foundry/protocol-academy/8-evm/Memory.sol --sig 'expand()'
+
+      // Observe the free memory pointer increase
+      // when more memory is allocated
+      bytes1[3] memory data;
+    }
+
+    function mstore() public {
+      // forge debug contracts/test/foundry/protocol-academy/8-evm/Memory.sol --sig 'mstore()'
+
+      // Observe the free memory pointer increase
+      // when more memory is allocated
+      bytes1[3] memory data;
+      // Observe each value being set in the memory
+      // slots
+      data[1] = 0x42;
+      data[0] = 0x0a;
+      data[2] = 0xff;
+    }
+}