feat(cheatcodes): add setEvmVersion / getEvmVersion

crates/cheatcodes/spec/src/vm.rs

@@ -609,6 +609,14 @@ interface Vm {
     #[cheatcode(group = Evm, safety = Unsafe)]
     function coolSlot(address target, bytes32 slot) external;
 
+    /// Returns the execution evm version.
+    #[cheatcode(group = Evm, safety = Safe)]
+    function getEvmVersion() external pure returns (string memory evm);
+
+    /// Set the execution evm version.
+    #[cheatcode(group = Evm, safety = Safe)]
+    function setEvmVersion(string calldata evm) external;
+
     // -------- Call Manipulation --------
     // --- Mocks ---
 

crates/cheatcodes/src/evm.rs

@@ -21,6 +21,7 @@ use foundry_common::{
         SlotInfo,
     },
 };
+use foundry_compilers::artifacts::EvmVersion;
 use foundry_evm_core::{
     ContextExt,
     backend::{DatabaseExt, RevertStateSnapshotAction},
@@ -45,6 +46,7 @@ use std::{
 
 mod record_debug_step;
 use foundry_common::fmt::format_token_raw;
+use foundry_config::evm_spec_id;
 use record_debug_step::{convert_call_trace_to_debug_step, flatten_call_trace};
 use serde::Serialize;
 
@@ -1103,6 +1105,23 @@ impl Cheatcode for stopAndReturnDebugTraceRecordingCall {
     }
 }
 
+impl Cheatcode for setEvmVersionCall {
+    fn apply_stateful(&self, ccx: &mut CheatsCtxt) -> Result {
+        let Self { evm } = self;
+        ccx.ecx.cfg.spec = evm_spec_id(
+            EvmVersion::from_str(evm)
+                .map_err(|_| Error::from(format!("invalid evm version {evm}")))?,
+        );
+        Ok(Default::default())
+    }
+}
+
+impl Cheatcode for getEvmVersionCall {
+    fn apply_stateful(&self, ccx: &mut CheatsCtxt) -> Result {
+        Ok(ccx.ecx.cfg.spec.to_string().to_lowercase().abi_encode())
+    }
+}
+
 pub(super) fn get_nonce(ccx: &mut CheatsCtxt, address: &Address) -> Result {
     let account = ccx.ecx.journaled_state.load_account(*address)?;
     Ok(account.info.nonce.abi_encode())

crates/forge/tests/it/spec.rs

@@ -1,11 +1,99 @@
 //! Integration tests for EVM specifications.
 
 use crate::{config::*, test_helpers::TEST_DATA_PARIS};
-use foundry_test_utils::Filter;
+use foundry_test_utils::{Filter, forgetest_init, rpc, str};
 use revm::primitives::hardfork::SpecId;
 
 #[tokio::test(flavor = "multi_thread")]
 async fn test_shanghai_compat() {
     let filter = Filter::new("", "ShanghaiCompat", ".*spec");
     TestConfig::with_filter(TEST_DATA_PARIS.runner(), filter).spec_id(SpecId::SHANGHAI).run().await;
 }
+
+// Test evm version switch during tests / scripts.
+// <https://github.com/foundry-rs/foundry/issues/9840>
+// <https://github.com/foundry-rs/foundry/issues/6228>
+forgetest_init!(test_set_evm_version, |prj, cmd| {
+    let endpoint = rpc::next_http_archive_rpc_url();
+    prj.add_test(
+        "TestEvmVersion.t.sol",
+        &r#"
+import {Test} from "forge-std/Test.sol";
+
+interface EvmVm {
+    function getEvmVersion() external pure returns (string memory evm);
+    function setEvmVersion(string calldata evm) external;
+}
+
+interface ICreate2Deployer {
+    function computeAddress(bytes32 salt, bytes32 codeHash) external view returns (address);
+}
+
+contract TestEvmVersion is Test {
+    function test_evm_version() public {
+        EvmVm evm = EvmVm(address(bytes20(uint160(uint256(keccak256("hevm cheat code"))))));
+        vm.createSelectFork("<rpc>");
+
+        evm.setEvmVersion("istanbul");
+        evm.getEvmVersion();
+
+        // revert with NotActivated for istanbul
+        vm.expectRevert();
+        compute();
+
+        evm.setEvmVersion("shanghai");
+        evm.getEvmVersion();
+        compute();
+
+        // switch to Paris, expect revert with NotActivated
+        evm.setEvmVersion("paris");
+        vm.expectRevert();
+        compute();
+    }
+
+    function compute() internal view {
+        ICreate2Deployer(0x35Da41c476fA5c6De066f20556069096A1F39364).computeAddress(bytes32(0), bytes32(0));
+    }
+}
+   "#.replace("<rpc>", &endpoint),
+    );
+    // Tests should fail and record counterexample with value 2.
+    cmd.args(["test", "--mc", "TestEvmVersion", "-vvvv"]).assert_success().stdout_eq(str![[r#"
+[COMPILING_FILES] with [SOLC_VERSION]
+[SOLC_VERSION] [ELAPSED]
+Compiler run successful!
+
+Ran 1 test for test/TestEvmVersion.t.sol:TestEvmVersion
+[PASS] test_evm_version() ([GAS])
+Traces:
+  [..] TestEvmVersion::test_evm_version()
+    ├─ [0] VM::createSelectFork("<rpc url>")
+    │   └─ ← [Return] 0
+    ├─ [0] VM::setEvmVersion("istanbul")
+    │   └─ ← [Return]
+    ├─ [0] VM::getEvmVersion() [staticcall]
+    │   └─ ← [Return] "istanbul"
+    ├─ [0] VM::expectRevert(custom error 0xf4844814)
+    │   └─ ← [Return]
+    ├─ [..] 0x35Da41c476fA5c6De066f20556069096A1F39364::computeAddress(0x0000000000000000000000000000000000000000000000000000000000000000, 0x0000000000000000000000000000000000000000000000000000000000000000) [staticcall]
+    │   └─ ← [NotActivated] EvmError: NotActivated
+    ├─ [0] VM::setEvmVersion("shanghai")
+    │   └─ ← [Return]
+    ├─ [0] VM::getEvmVersion() [staticcall]
+    │   └─ ← [Return] "shanghai"
+    ├─ [..] 0x35Da41c476fA5c6De066f20556069096A1F39364::computeAddress(0x0000000000000000000000000000000000000000000000000000000000000000, 0x0000000000000000000000000000000000000000000000000000000000000000) [staticcall]
+    │   └─ ← [Return] 0x0f40d7B7669e3a6683EaB25358318fd42a9F2342
+    ├─ [0] VM::setEvmVersion("paris")
+    │   └─ ← [Return]
+    ├─ [0] VM::expectRevert(custom error 0xf4844814)
+    │   └─ ← [Return]
+    ├─ [..] 0x35Da41c476fA5c6De066f20556069096A1F39364::computeAddress(0x0000000000000000000000000000000000000000000000000000000000000000, 0x0000000000000000000000000000000000000000000000000000000000000000) [staticcall]
+    │   └─ ← [NotActivated] EvmError: NotActivated
+    └─ ← [Stop]
+
+Suite result: ok. 1 passed; 0 failed; 0 skipped; [ELAPSED]
+
+Ran 1 test suite [ELAPSED]: 1 tests passed, 0 failed, 0 skipped (1 total tests)
+
+"#]]);
+});