Update checkouts and report generation.

.github/workflows/benchmark.yml

@@ -1,3 +1,5 @@
+# This workflow will run on the default branch when triggered by a `workflow_run` event.
+
 name: Benchmark
 
 on:
@@ -8,13 +10,14 @@ on:
 jobs:
   benchmark:
     runs-on: ubuntu-24.04
-    # TODO: Add condition that the base branch in the PR is main.
     if: ${{ github.event.workflow_run.conclusion == 'success' && github.event.workflow_run.event == 'pull_request' }}
     permissions:
       pull-requests: write
     steps:
-      - name: Checkout
+      - name: Checkout PR Branch
         uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.workflow_run.head_sha }}
 
       - name: Set Up Rust Toolchain
         uses: actions-rust-lang/setup-rust-toolchain@v1
@@ -36,76 +39,81 @@ jobs:
 
       - name: Install Benchmarking Tools
         run: |
-          cargo install cargo-criterion critcmp
+          cargo install critcmp
 
       - name: Checkout and Compile Main Branch
         run: |
-          git fetch origin "$GITHUB_DEFAULT_BRANCH":"$GITHUB_DEFAULT_BRANCH"
-          git checkout -f "$GITHUB_DEFAULT_BRANCH"
+          git fetch origin main
+          git checkout -f main
           make install
 
       - name: Run Benchmarks on Main Branch
         run: |
-          cargo bench --package resolc --bench compile -- --save-baseline main-resolc
-          cargo bench --package revive-yul --bench parse -- --save-baseline main-yul-parse
-          cargo bench --package revive-yul --bench lower -- --save-baseline main-yul-lower
+          cargo bench --package resolc --bench compile -- --save-baseline main_branch_resolc
+          cargo bench --package revive-yul --bench parse -- --save-baseline main_branch_yul_parse
+          cargo bench --package revive-yul --bench lower -- --save-baseline main_branch_yul_lower
         timeout-minutes: 20
 
       - name: Checkout and Compile PR Branch
         run: |
-          git checkout -f ${{ github.sha }}
+          git checkout -f ${{ github.event.workflow_run.head_sha }}
           make install
 
       - name: Run Benchmarks on PR Branch
         run: |
-          cargo bench --package resolc --bench compile -- --save-baseline pr-resolc
-          cargo bench --package revive-yul --bench parse -- --save-baseline pr-yul-parse
-          cargo bench --package revive-yul --bench lower -- --save-baseline pr-yul-lower
+          cargo bench --package resolc --bench compile -- --save-baseline pr_branch_resolc
+          cargo bench --package revive-yul --bench parse -- --save-baseline pr_branch_yul_parse
+          cargo bench --package revive-yul --bench lower -- --save-baseline pr_branch_yul_lower
         timeout-minutes: 20
 
       - name: Compare Benchmarks
         run: |
-          critcmp main-resolc pr-resolc > benchmarks-resolc
-          critcmp main-yul-parse pr-yul-parse > benchmarks-yul-parse
-          critcmp main-yul-lower pr-yul-lower > benchmarks-yul-lower
+          critcmp main_branch_resolc pr_branch_resolc > benchmarks_resolc
+          critcmp main_branch_yul_parse pr_branch_yul_parse > benchmarks_yul_parse
+          critcmp main_branch_yul_lower pr_branch_yul_lower > benchmarks_yul_lower
 
-      - name: Post PR Comment with Benchmark Results
+      - name: Create Report
+        run: |
+          cat > BENCHMARK_REPORT.md << EOF
+          # Benchmarks
+
+          ## Compile E2E
+
+          <details>
+              <summary>Details</summary>
+
+          \`\`\`
+          $(cat benchmarks_resolc)
+          \`\`\`
+
+          </details>
+
+          ## Parse Yul
+
+          <details>
+              <summary>Details</summary>
+
+          \`\`\`
+          $(cat benchmarks_yul_parse)
+          \`\`\`
+
+          </details>
+
+          ## Lower Yul
+
+          <details>
+              <summary>Details</summary>
+
+          \`\`\`
+          $(cat benchmarks_yul_lower)
+          \`\`\`
+
+          </details>
+          EOF
+
+      - name: Post PR Comment with Benchmark Report
         uses: marocchino/sticky-pull-request-comment@v2
         with:
           header: benchmark
           number: ${{ github.event.workflow_run.pull_requests[0].number }}
-          message: |
-            # Benchmarks
-
-            ## Compile E2E
-
-            <details>
-                <summary>Details</summary>
-
-            ```
-            $(cat benchmarks-resolc)
-            ```
-
-            </details>
-
-            ## Parse Yul
-
-            <details>
-                <summary>Details</summary>
-
-            ```
-            $(cat benchmarks-yul-parse)
-            ```
-
-            </details>
-
-            ## Lower Yul
-
-            <details>
-                <summary>Details</summary>
-
-            ```
-            $(cat benchmarks-yul-lower)
-            ```
-
-            </details>
+          path: BENCHMARK_REPORT.md