revive/.github/workflows/reusable-build-wasm.yml

name: Reusable Build — Wasm

on:
  workflow_call:
    inputs:
      is_release:
        description: "Whether this is a release build"
        required: true
        type: boolean
      retention_days:
        description: "Artifact retention days"
        required: false
        type: number
        default: 1
    outputs:
      resolc_web_js_url:
        value: ${{ jobs.build.outputs.resolc_web_js_url }}
      resolc_web_js_sha:
        value: ${{ jobs.build.outputs.resolc_web_js_sha }}

env:
  CARGO_TERM_COLOR: always
  EMSCRIPTEN_TARGET: wasm32-unknown-emscripten
  HOST_TARGET: x86_64-unknown-linux-gnu

jobs:
  build:
    name: Build Wasm
    runs-on: ubuntu-24.04
    outputs:
      resolc_web_js_url: ${{ steps.upload-web-js.outputs.artifact-url }}
      resolc_web_js_sha: ${{ steps.upload-web-js.outputs.artifact-digest }}
    concurrency:
      # Use `reusable-build` and not `${{ github.workflow }}` here so that callers share the same concurrency group.
      group: reusable-build-wasm32-unknown-emscripten-${{ github.sha }}
      cancel-in-progress: false
    steps:
      - name: Checkout revive
        uses: actions/checkout@v6

      - name: Check Build Cache
        id: cache
        uses: actions/cache@v5
        with:
          path: resolc-${{ env.EMSCRIPTEN_TARGET }}
          key: build-${{ env.EMSCRIPTEN_TARGET }}-${{ github.sha }}

      - name: Set Up Rust Toolchain
        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          # Pin to 1.92.0 until LLVM Wasm libraries are rebuilt with -fwasm-exceptions
          # See: https://github.com/paritytech/revive/pull/463
          toolchain: "1.92.0"
          target: ${{ env.EMSCRIPTEN_TARGET }}
          rustflags: ""

      - name: Download Host LLVM
        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
        uses: ./.github/actions/get-llvm
        with:
          target: ${{ env.HOST_TARGET }}

      - name: Download Wasm LLVM
        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
        uses: ./.github/actions/get-llvm
        with:
          target: ${{ env.EMSCRIPTEN_TARGET }}

      - name: Download EMSDK
        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
        uses: ./.github/actions/get-emsdk

      - name: Build
        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
        env:
          # Consumed by js/emscripten/build.js.
          # For nightly Wasm releases, this URI is currently broken (see https://github.com/paritytech/revive/issues/542).
          RELEASE_RESOLC_WASM_URI: ${{ inputs.is_release && format('https://github.com/paritytech/revive/releases/download/{0}/resolc.wasm', github.ref_name) || '' }}
        run: |
          export LLVM_SYS_221_PREFIX=$PWD/llvm-${{ env.HOST_TARGET }}
          export REVIVE_LLVM_TARGET_PREFIX=$PWD/llvm-${{ env.EMSCRIPTEN_TARGET }}
          source emsdk/emsdk_env.sh
          make install-wasm
          chmod -x ./target/${{ env.EMSCRIPTEN_TARGET }}/release/resolc.wasm

      - name: Move Artifacts
        if: ${{ steps.cache.outputs.cache-hit != 'true' }}
        run: |
          mkdir -p resolc-${{ env.EMSCRIPTEN_TARGET }}
          mv ./target/${{ env.EMSCRIPTEN_TARGET }}/release/resolc.js ./resolc-${{ env.EMSCRIPTEN_TARGET }}/
          mv ./target/${{ env.EMSCRIPTEN_TARGET }}/release/resolc.wasm ./resolc-${{ env.EMSCRIPTEN_TARGET }}/
          mv ./target/${{ env.EMSCRIPTEN_TARGET }}/release/resolc_web.js ./resolc-${{ env.EMSCRIPTEN_TARGET }}/

      - name: Set Up Node.js
        uses: actions/setup-node@v6
        with:
          node-version: "24"

      - name: Basic Sanity Check
        run: |
          mkdir -p solc
          curl -sSLo solc/soljson.js https://github.com/argotorg/solidity/releases/download/v0.8.35/soljson.js
          node -e "
          // Make sure to require './solc/soljson' and not 'solc/soljson' in order to use
          // the explicitly downloaded solc, rather than resolving an npm package potentially
          // installed in prior workflow steps.
          const soljson = require('./solc/soljson');
          const createRevive = require('./resolc-${{ env.EMSCRIPTEN_TARGET }}/resolc.js');

          const compiler = createRevive();
          compiler.soljson = soljson;

          const standardJsonInput =
          {
            language: 'Solidity',
            sources: {
              'MyContract.sol': {
                content: 'pragma solidity ^0.8.0; contract MyContract { function greet() public pure returns (string memory) { return \'Hello\'; } }',
              },
            },
            settings: {
              optimizer: { enabled: false },
              outputSelection: {
                '*': {
                  '*': ['evm.bytecode']
                }
              }
            }
          };

          compiler.writeToStdin(JSON.stringify(standardJsonInput));
          compiler.callMain(['--standard-json']);

          const stdout = compiler.readFromStdout();
          const stderr = compiler.readFromStderr();

          if (stderr) { console.error(stderr); process.exit(1); }

          let out = JSON.parse(stdout);
          let bytecode = out.contracts['MyContract.sol']['MyContract'].evm.bytecode.object
          console.log(bytecode);

          if(!bytecode.startsWith('50564d')) { process.exit(1); }
          "

      - name: Upload Bundle Artifact (Release)
        if: ${{ inputs.is_release }}
        uses: actions/upload-artifact@v6
        with:
          name: resolc-${{ env.EMSCRIPTEN_TARGET }}
          path: resolc-${{ env.EMSCRIPTEN_TARGET }}/*
          retention-days: ${{ inputs.retention_days }}

      # There is no way to upload several files as several artifacts with a single upload-artifact step.
      # It's needed to have resolc_web.js separately for nightly builds for resolc-bin repo.
      # https://github.com/actions/upload-artifact/issues/331
      - name: Upload resolc.js (Nightly)
        if: ${{ !inputs.is_release }}
        uses: actions/upload-artifact@v6
        with:
          name: resolc.js
          path: resolc-${{ env.EMSCRIPTEN_TARGET }}/resolc.js
          retention-days: ${{ inputs.retention_days }}

      - name: Upload resolc.wasm (Nightly)
        if: ${{ !inputs.is_release }}
        uses: actions/upload-artifact@v6
        with:
          name: resolc.wasm
          path: resolc-${{ env.EMSCRIPTEN_TARGET }}/resolc.wasm
          retention-days: ${{ inputs.retention_days }}

      - name: Upload resolc_web.js (Nightly)
        if: ${{ !inputs.is_release }}
        id: upload-web-js
        uses: actions/upload-artifact@v6
        with:
          name: resolc_web.js
          path: resolc-${{ env.EMSCRIPTEN_TARGET }}/resolc_web.js
          retention-days: ${{ inputs.retention_days }}