chore: reactivate gates report (#5084)

# Description

## Problem\*

Resolves <!-- Link to GitHub Issue -->

## Summary\*

This PR reactivates the gates report workflow now that we don't have
access to the number of constraints through `nargo info`

## Additional Context



## Documentation\*

Check one:
- [x] No documentation needed.
- [ ] Documentation included in this PR.
- [ ] **[For Experimental Features]** Documentation to be submitted in a
separate PR.

# PR Checklist\*

- [x] I have tested the changes locally.
- [x] I have formatted the changes with [Prettier](https://prettier.io/)
and/or `cargo fmt` on default settings.

.github/workflows/gates_report.yml

@@ -1,88 +1,94 @@
-# name: Report gates diff
-
-# on:
-#   push:
-#     branches:
-#       - master
-#   pull_request:
-
-# jobs:
-#   build-nargo:
-#     runs-on: ubuntu-latest
-#     strategy:
-#       matrix:
-#         target: [x86_64-unknown-linux-gnu]
-
-#     steps:
-#       - name: Checkout Noir repo
-#         uses: actions/checkout@v4
-
-#       - name: Setup toolchain
-#         uses: dtolnay/rust-toolchain@1.74.1
-
-#       - uses: Swatinem/rust-cache@v2
-#         with:
-#           key: ${{ matrix.target }}
-#           cache-on-failure: true
-#           save-if: ${{ github.event_name != 'merge_group' }}
-
-#       - name: Build Nargo
-#         run: cargo build --package nargo_cli --release
-
-#       - name: Package artifacts
-#         run: |
-#           mkdir dist
-#           cp ./target/release/nargo ./dist/nargo
-#           7z a -ttar -so -an ./dist/* | 7z a -si ./nargo-x86_64-unknown-linux-gnu.tar.gz
-
-#       - name: Upload artifact
-#         uses: actions/upload-artifact@v4
-#         with:
-#           name: nargo
-#           path: ./dist/*
-#           retention-days: 3
-
-
-#   compare_gas_reports:
-#     needs: [build-nargo]
-#     runs-on: ubuntu-latest
-#     permissions:
-#       pull-requests: write
-
-#     steps:
-#       - uses: actions/checkout@v4
-
-#       - name: Download nargo binary
-#         uses: actions/download-artifact@v4
-#         with:
-#           name: nargo
-#           path: ./nargo
-
-#       - name: Set nargo on PATH
-#         run: |
-#           nargo_binary="${{ github.workspace }}/nargo/nargo"
-#           chmod +x $nargo_binary
-#           echo "$(dirname $nargo_binary)" >> $GITHUB_PATH
-#           export PATH="$PATH:$(dirname $nargo_binary)"
-#           nargo -V
-
-#       - name: Generate gates report
-#         working-directory: ./test_programs
-#         run: |
-#           ./gates_report.sh
-#           mv gates_report.json ../gates_report.json
+name: Report gates diff
+
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build-nargo:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        target: [x86_64-unknown-linux-gnu]
+
+    steps:
+      - name: Checkout Noir repo
+        uses: actions/checkout@v4
+
+      - name: Setup toolchain
+        uses: dtolnay/rust-toolchain@1.74.1
+
+      - uses: Swatinem/rust-cache@v2
+        with:
+          key: ${{ matrix.target }}
+          cache-on-failure: true
+          save-if: ${{ github.event_name != 'merge_group' }}
+
+      - name: Build Nargo
+        run: cargo build --package nargo_cli --release
+
+      - name: Package artifacts
+        run: |
+          mkdir dist
+          cp ./target/release/nargo ./dist/nargo
+          7z a -ttar -so -an ./dist/* | 7z a -si ./nargo-x86_64-unknown-linux-gnu.tar.gz
+
+      - name: Upload artifact
+        uses: actions/upload-artifact@v4
+        with:
+          name: nargo
+          path: ./dist/*
+          retention-days: 3
+
+
+  compare_gates_reports:
+    needs: [build-nargo]
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install `bb`
+        run: |
+          ./scripts/install_bb.sh
+          echo "$HOME/.bb/" >> $GITHUB_PATH
+
+      - name: Download nargo binary
+        uses: actions/download-artifact@v4
+        with:
+          name: nargo
+          path: ./nargo
+
+      - name: Set nargo on PATH
+        run: |
+          nargo_binary="${{ github.workspace }}/nargo/nargo"
+          chmod +x $nargo_binary
+          echo "$(dirname $nargo_binary)" >> $GITHUB_PATH
+          export PATH="$PATH:$(dirname $nargo_binary)"
+          nargo -V
+
+      - name: Generate gates report
+        working-directory: ./test_programs
+        run: |
+          ./rebuild.sh
+          ./gates_report.sh
+          mv gates_report.json ../gates_report.json
       
-#       - name: Compare gates reports
-#         id: gates_diff
-#         uses: vezenovm/noir-gates-diff@acf12797860f237117e15c0d6e08d64253af52b6
-#         with:
-#           report: gates_report.json
-#           summaryQuantile: 0.9 # only display the 10% most significant circuit size diffs in the summary (defaults to 20%)
-
-#       - name: Add gates diff to sticky comment
-#         if: github.event_name == 'pull_request' || github.event_name == 'pull_request_target'
-#         uses: marocchino/sticky-pull-request-comment@v2
-#         with:
-#           # delete the comment in case changes no longer impact circuit sizes
-#           delete: ${{ !steps.gates_diff.outputs.markdown }}
-#           message: ${{ steps.gates_diff.outputs.markdown }}
+      - name: Compare gates reports
+        id: gates_diff
+        uses: vezenovm/noir-gates-diff@acf12797860f237117e15c0d6e08d64253af52b6
+        with:
+          report: gates_report.json
+          summaryQuantile: 0.9 # only display the 10% most significant circuit size diffs in the summary (defaults to 20%)
+
+      - name: Add gates diff to sticky comment
+        if: github.event_name == 'pull_request' || github.event_name == 'pull_request_target'
+        uses: marocchino/sticky-pull-request-comment@v2
+        with:
+          # delete the comment in case changes no longer impact circuit sizes
+          delete: ${{ !steps.gates_diff.outputs.markdown }}
+          message: ${{ steps.gates_diff.outputs.markdown }}

test_programs/gates_report.sh

@@ -1,36 +1,37 @@
 #!/usr/bin/env bash
 set -e
 
+BACKEND=${BACKEND:-bb}
+
 # These tests are incompatible with gas reporting
 excluded_dirs=("workspace" "workspace_default_member" "double_verify_nested_proof")
 
-# These tests cause failures in CI with a stack overflow for some reason.
-ci_excluded_dirs=("eddsa")
-
 current_dir=$(pwd)
-base_path="$current_dir/execution_success"
-test_dirs=$(ls $base_path)
+artifacts_path="$current_dir/acir_artifacts"
+test_dirs=$(ls $artifacts_path)
 
-# We generate a Noir workspace which contains all of the test cases
-# This allows us to generate a gates report using `nargo info` for all of them at once.
+echo "{\"programs\": [" > gates_report.json
 
-echo "[workspace]" > Nargo.toml
-echo "members = [" >> Nargo.toml
+# Bound for checking where to place last parentheses 
+NUM_ARTIFACTS=$(ls -1q "$artifacts_path" | wc -l)
 
-for dir in $test_dirs; do
-    if [[ " ${excluded_dirs[@]} " =~ " ${dir} " ]]; then
-      continue
-    fi
+ITER="1"
+for pathname in $test_dirs; do    
+    ARTIFACT_NAME=$(basename "$pathname")
+
+    GATES_INFO=$($BACKEND gates -b "$artifacts_path/$ARTIFACT_NAME/target/program.json")
+    MAIN_FUNCTION_INFO=$(echo $GATES_INFO | jq -r '.functions[0] | .name = "main"')
+    echo "{\"package_name\": \"$ARTIFACT_NAME\", \"functions\": [$MAIN_FUNCTION_INFO]" >> gates_report.json
 
-    if [[ ${CI-false} = "true" ]] && [[ " ${ci_excluded_dirs[@]} " =~ " ${dir} " ]]; then
-      continue
+    if (($ITER == $NUM_ARTIFACTS)); then
+        echo "}" >> gates_report.json
+    else 
+        echo "}, " >> gates_report.json
     fi
 
-    echo "  \"execution_success/$dir\"," >> Nargo.toml
+    ITER=$(( $ITER + 1 ))
 done
 
-echo "]" >> Nargo.toml
+echo "]}" >> gates_report.json 
 
-nargo info --json > gates_report.json
 
-rm Nargo.toml