chore(ci): print protocol circuits gate counts

.github/scripts/merge-gates-reports.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+set -eu
+
+combined_reports='{"programs": []}'
+
+# Iterate over each report and merge them
+for report in ./reports/*; do
+  # The report is saved under ./$REPORT_NAME_{ matrix_report }/$REPORT_NAME_{ matrix_report }.json
+  FILE_PATH=$(echo $(ls $report)) 
+
+  # Extract the $NAME_PLURAL array from each report and merge it
+  combined_reports=$(jq --argjson COMBINED_REPORTS "$combined_reports" '.programs += $COMBINED_REPORTS.programs' <<< "$(cat "$report/$FILE_PATH")")
+done
+
+echo "$combined_reports"
+

.github/scripts/single_artifact_gates_report.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+set -e
+
+BACKEND=${BACKEND:-bb}
+
+ARTIFACT_PATH=$1
+ARTIFACT_NAME=$(basename "$ARTIFACT_PATH")
+
+GATES_INFO=$($BACKEND gates -b $ARTIFACT_PATH)
+MAIN_FUNCTION_INFO=$(echo $GATES_INFO | jq -r '.functions[0] | .name = "main" | del(.gates_per_opcode)')
+echo "{\"programs\": [ {\"package_name\": \"$ARTIFACT_NAME\", \"functions\": [$MAIN_FUNCTION_INFO]} ]}"
+

.github/workflows/reports.yml

@@ -330,6 +330,8 @@ jobs:
         with:
           path: scripts
           sparse-checkout: |
+            scripts/install_bb.sh
+            .github/scripts/single_artifact_gates_report.sh
             test_programs/compilation_report.sh
           sparse-checkout-cone-mode: false
 
@@ -352,7 +354,6 @@ jobs:
         if: ${{ !matrix.project.take_average }}
         run: |
           mv /home/runner/work/noir/noir/scripts/test_programs/compilation_report.sh ./compilation_report.sh
-          chmod +x ./compilation_report.sh
           ./compilation_report.sh 1
 
       - name: Generate compilation report with averages
@@ -412,6 +413,33 @@ jobs:
           retention-days: 3
           overwrite: true
 
+      # While we've got the compiled artifacts, we measure the number of gates in the circuits.
+
+      - name: Install `bb`
+        if: ${{ !matrix.project.is_library }}
+        run: |
+          ./scripts/scripts/install_bb.sh
+          echo "$HOME/.bb/" >> $GITHUB_PATH
+
+      - name: Generate gates report
+        if: ${{ !matrix.project.is_library }}  
+        id: gates_report
+        run: |
+          PACKAGE_NAME=${{ matrix.project.path }}
+          PACKAGE_NAME=$(basename $PACKAGE_NAME)
+          ./scripts/.github/scripts/single_artifact_gates_report.sh ./test-repo/${{ matrix.project.path }}/target/*.json > gates_report_$PACKAGE_NAME.json
+          cat gates_report_$PACKAGE_NAME.json
+          echo "gates_report_name=$PACKAGE_NAME" >> $GITHUB_OUTPUT
+
+      - name: Upload gates report
+        if: ${{ !matrix.project.is_library }}
+        uses: actions/upload-artifact@v4
+        with:
+          name: gates_report_${{ steps.gates_report.outputs.gates_report_name }}
+          path: gates_report_${{ steps.gates_report.outputs.gates_report_name }}.json
+          retention-days: 3
+          overwrite: true
+
   upload_compilation_report:
     name: Upload compilation report 
     needs: [generate_compilation_and_execution_report, external_repo_compilation_and_execution_report]
@@ -456,6 +484,44 @@ jobs:
           header: compilation
           message: ${{ steps.compilation_report.outputs.markdown }}
 
+  upload_gates_report:
+    name: Upload gates report 
+    needs: [external_repo_compilation_report]
+    # We want this job to run even if one variation of the matrix in `external_repo_compilation_report` fails
+    if: always() 
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Download matrix gates reports
+        uses: actions/download-artifact@v4
+        with:
+          pattern: gates_report_*
+          path: ./reports
+
+      - name: Merge gates reports using jq
+        run: |
+          mv ./.github/scripts/merge-gates-reports.sh merge-gates-reports.sh
+          ./merge-gates-reports.sh > protocol_circuits_gates_report.json
+          cat protocol_circuits_gates_report.json
+
+      - name: Compare gates reports
+        id: gates_diff
+        uses: noir-lang/noir-gates-diff@10f066ecad44098afef183327a13b4a7c4189ae6
+        with:
+          report: protocol_circuits_gates_report.json
+          summaryQuantile: 0.9 # only display the 10% most significant circuit size diffs in the summary (defaults to 20%)
+
+      - name: Add memory report to sticky comment
+        if: github.event_name == 'pull_request' || github.event_name == 'pull_request_target'
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          header: protocol_gates
+          message: ${{ steps.gates_diff.outputs.markdown }}
+
   external_repo_memory_report:
     needs: [build-nargo]
     runs-on: ubuntu-latest