perf: clear from test suite result

crates/common/src/contracts.rs

@@ -69,6 +69,11 @@ impl ContractsByArtifact {
         Self(Arc::new(map))
     }
 
+    /// Clears all contracts.
+    pub fn clear(&mut self) {
+        *self = Self::default();
+    }
+
     /// Finds a contract which has a similar bytecode as `code`.
     pub fn find_by_creation_code(&self, code: &[u8]) -> Option<ArtifactWithContractRef> {
         self.iter().find(|(_, contract)| {

crates/forge/bin/cmd/test/mod.rs

@@ -392,12 +392,12 @@ impl TestArgs {
         let mut outcome = TestOutcome::empty(self.allow_failure);
 
         let mut any_test_failed = false;
-        for (contract_name, suite_result) in rx {
+        for (contract_name, mut suite_result) in rx {
             let tests = &suite_result.test_results;
 
             // Set up trace identifiers.
-            let known_contracts = suite_result.known_contracts.clone();
-            let mut identifier = TraceIdentifiers::new().with_local(&known_contracts);
+            let known_contracts = &suite_result.known_contracts;
+            let mut identifier = TraceIdentifiers::new().with_local(known_contracts);
 
             // Avoid using etherscan for gas report as we decode more traces and this will be
             // expensive.
@@ -407,7 +407,7 @@ impl TestArgs {
 
             // Build the trace decoder.
             let mut builder = CallTraceDecoderBuilder::new()
-                .with_known_contracts(&known_contracts)
+                .with_known_contracts(known_contracts)
                 .with_verbosity(verbosity);
             // Signatures are of no value for gas reports.
             if !self.gas_report {
@@ -524,6 +524,9 @@ impl TestArgs {
             // Print suite summary.
             shell::println(suite_result.summary())?;
 
+            // Free memory.
+            suite_result.keep_only_results();
+
             // Add the suite result to the outcome.
             outcome.results.insert(contract_name, suite_result);
             outcome.last_run_decoder = Some(decoder);

crates/forge/src/result.rs

@@ -214,6 +214,11 @@ impl SuiteResult {
         Self { duration, test_results, warnings, libraries, known_contracts }
     }
 
+    /// Frees memory that is not used for the final output.
+    pub fn keep_only_results(&mut self) {
+        ContractsByArtifact::clear(&mut self.known_contracts);
+    }
+
     /// Returns an iterator over all individual succeeding tests and their names.
     pub fn successes(&self) -> impl Iterator<Item = (&String, &TestResult)> {
         self.tests().filter(|(_, t)| t.status == TestStatus::Success)