Add compilation to NodeJS module

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

@@ -0,0 +1,79 @@
+name: Build revive-wasm
+on:
+  push:
+    branches: ["main"]
+  pull_request:
+    branches: ["main"]
+  workflow_dispatch:
+
+env:
+  CARGO_TERM_COLOR: always
+  REVIVE_WASM_INSTALL_DIR: ${{ github.workspace }}/target/wasm32-unknown-emscripten/release
+  EMSCRIPTEN_VERSION: 3.1.64
+
+jobs:
+  build-revive-wasm:
+    runs-on: ubuntu-latest
+    defaults:
+      run:
+        shell: bash
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Cache LLVM build
+        id: cache-llvm
+        uses: actions/cache@v3
+        with:
+          path: |
+            llvm18.0-emscripten
+          # Use a unique key based on LLVM version or configuration files to avoid cache invalidation
+          key: llvm-build-${{ runner.os }}-${{ hashFiles('clone-llvm.sh', 'emscripten-build-llvm.sh') }}
+
+      - name: Install Dependencies
+        run: |
+          sudo apt-get update && sudo apt-get install -y cmake ninja-build libncurses5
+          rustup target add wasm32-unknown-emscripten
+          # Install LLVM required for the compiler runtime, runtime-api and stdlib
+          curl -sSL --output llvm.tar.xz https://github.com/llvm/llvm-project/releases/download/llvmorg-18.1.4/clang+llvm-18.1.4-x86_64-linux-gnu-ubuntu-18.04.tar.xz
+          tar Jxf llvm.tar.xz
+          mv clang+llvm-18.1.4-x86_64-linux-gnu-ubuntu-18.04 llvm18/
+          echo "$(pwd)/llvm18/bin" >> $GITHUB_PATH
+          # Install Emscripten
+          git clone https://github.com/emscripten-core/emsdk.git
+          cd emsdk
+          ./emsdk install ${{ env.EMSCRIPTEN_VERSION }}
+          ./emsdk activate ${{ env.EMSCRIPTEN_VERSION }}
+
+      - run: |
+          rustup show
+          cargo --version
+          rustup +nightly show
+          cargo +nightly --version
+          cmake --version
+          bash --version
+          llvm-config --version
+
+      - name: Build LLVM
+        if: steps.cache-llvm.outputs.cache-hit != 'true'
+        run: |
+          export EMSDK_ROOT=${PWD}/emsdk
+          ./emscripten-build-llvm.sh
+
+      - name: Use Cached LLVM
+        if: steps.cache-llvm.outputs.cache-hit == 'true'
+        run: |
+          echo "Using cached LLVM"
+
+      - name: Build revive
+        run: |
+          export LLVM_LINK_PREFIX=${PWD}/llvm18.0-emscripten
+          source ./emsdk/emsdk_env.sh
+          make install-wasm
+
+      - uses: actions/upload-artifact@v4
+        with:
+          name: revive-wasm
+          path: |
+            ${{ env.REVIVE_WASM_INSTALL_DIR }}/resolc.js
+            ${{ env.REVIVE_WASM_INSTALL_DIR }}/resolc.wasm
+          retention-days: 1

.gitignore

@@ -8,9 +8,10 @@
 /*.s
 /llvm-project
 /llvm18.0
+/llvm18.0-emscripten
 node_modules
 artifacts
 tmp
 package-lock.json
 /*.html
-/build
+/js/resolc.*

Makefile

@@ -1,10 +1,25 @@
 .PHONY: install format test test-solidity test-cli test-integration test-workspace clean docs docs-build
 
+RUSTFLAGS_EMSCRIPTEN := \
+	-Clink-arg=-sEXPORTED_FUNCTIONS=_main,_free,_malloc \
+	-Clink-arg=-sNO_INVOKE_RUN \
+	-Clink-arg=-sEXIT_RUNTIME \
+	-Clink-arg=-sINITIAL_MEMORY=64MB \
+	-Clink-arg=-sTOTAL_MEMORY=3GB \
+	-Clink-arg=-sALLOW_MEMORY_GROWTH \
+	-Clink-arg=-sEXPORTED_RUNTIME_METHODS=FS,callMain,stringToNewUTF8,cwrap \
+	-Clink-arg=-sMODULARIZE \
+	-Clink-arg=-sEXPORT_ES6 \
+	-Clink-arg=--js-library=js/soljson_interface.js
+
 install: install-bin install-npm
 
 install-bin:
 	cargo install --path crates/solidity
 
+install-wasm:
+	RUSTFLAGS='$(RUSTFLAGS_EMSCRIPTEN)' cargo install --target wasm32-unknown-emscripten --path crates/solidity
+
 install-npm:
 	npm install && npm fund
 

README.md

@@ -27,7 +27,25 @@ resolc --version
 
 ### LLVM
 
-`revive` requires a build of LLVM 18.1.4 or later including `compiler-rt`. Use the provided [build-llvm.sh](build-llvm.sh) build script to compile a compatible LLVM build locally in `$PWD/llvm18.0` (don't forget to add that to `$PATH` afterwards). 
+`revive` requires a build of LLVM 18.1.4 or later including `compiler-rt`. Use the provided [build-llvm.sh](build-llvm.sh) build script to compile a compatible LLVM build locally in `$PWD/llvm18.0` (don't forget to add that to `$PATH` afterwards).
+
+### Cross-compilation to WASM
+
+Cross-compiles the Revive recompiler to WASM to enable it to run in a Node.js or browser environment.
+
+Install [emscripten](https://emscripten.org/docs/getting_started/downloads.html). Tested on version 3.1.64.
+To build resolc.js execute:
+
+```bash
+bash build-llvm.sh
+export PATH=${PWD}/llvm18.0/bin:$PATH
+export EMSDK_ROOT=<PATH_TO_EMSCRIPTEN_SDK>
+bash emscripten-build-llvm.sh
+source $EMSDK_ROOT/emsdk_env.sh
+export LLVM_LINK_PREFIX=${PWD}/llvm18.0-emscripten
+export PATH=$PATH:$PWD/llvm18.0-emscripten/bin/
+make install-wasm
+```
 
 ### Development
 

build-llvm.sh

@@ -5,17 +5,12 @@ set -euo pipefail
 INSTALL_DIR="${PWD}/llvm18.0"
 mkdir -p ${INSTALL_DIR}
 
-
-# Clone LLVM 18 (any revision after commit bd32aaa is supposed to work)
-if [ ! -d "llvm-project" ]; then
-  git clone --depth 1 --branch release/18.x https://github.com/llvm/llvm-project.git
-fi
-
+./clone-llvm.sh
 
 # Build LLVM, clang
 LLVM_SRC_PREFIX=${PWD}/llvm-project
 LLVM_SRC_DIR=${LLVM_SRC_PREFIX}/llvm
-LLVM_BUILD_DIR=${PWD}/build/llvm
+LLVM_BUILD_DIR=${LLVM_SRC_PREFIX}/build/llvm
 if [ ! -d ${LLVM_BUILD_DIR} ] ; then
 	mkdir -p ${LLVM_BUILD_DIR}
 fi
@@ -38,7 +33,7 @@ cmake --install ${LLVM_BUILD_DIR}
 
 # Build compiler builtins
 COMPILER_RT_SRC_DIR=${LLVM_SRC_PREFIX}/compiler-rt
-COMPILER_RT_BUILD_DIR=${PWD}/build/compiler-rt
+COMPILER_RT_BUILD_DIR=${LLVM_SRC_PREFIX}/build/compiler-rt
 if [ ! -d ${COMPILER_RT_BUILD_DIR} ] ; then
 	mkdir -p ${COMPILER_RT_BUILD_DIR}
 fi

clone-llvm.sh

@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# Clone LLVM 18 (any revision after commit bd32aaa is supposed to work)
+if [ ! -d "llvm-project" ]; then
+  git clone --depth 1 --branch release/18.x https://github.com/llvm/llvm-project.git
+fi

crates/lld-sys/build.rs

@@ -1,5 +1,19 @@
-fn llvm_config(arg: &str) -> String {
-    let output = std::process::Command::new("llvm-config")
+use std::{
+    env,
+    path::{Path, PathBuf},
+};
+
+const LLVM_LINK_PREFIX: &str = "LLVM_LINK_PREFIX";
+
+fn locate_llvm_config() -> PathBuf {
+    let prefix = env::var_os(LLVM_LINK_PREFIX)
+        .map(|p| PathBuf::from(p).join("bin"))
+        .unwrap_or_default();
+    prefix.join("llvm-config")
+}
+
+fn llvm_config(llvm_config_path: &Path, arg: &str) -> String {
+    let output = std::process::Command::new(llvm_config_path)
         .args([arg])
         .output()
         .unwrap_or_else(|_| panic!("`llvm-config {arg}` failed"));
@@ -8,8 +22,11 @@ fn llvm_config(arg: &str) -> String {
         .unwrap_or_else(|_| panic!("output of `llvm-config {arg}` should be utf8"))
 }
 
-fn set_rustc_link_flags() {
-    println!("cargo:rustc-link-search=native={}", llvm_config("--libdir"));
+fn set_rustc_link_flags(llvm_config_path: &Path) {
+    println!(
+        "cargo:rustc-link-search=native={}",
+        llvm_config(llvm_config_path, "--libdir")
+    );
 
     for lib in [
         "lldELF",
@@ -22,27 +39,74 @@ fn set_rustc_link_flags() {
         "LLVMTargetParser",
         "LLVMBinaryFormat",
         "LLVMDemangle",
+        // Required by `llvm-sys`
+        "LLVMRISCVDisassembler",
+        "LLVMRISCVAsmParser",
+        "LLVMRISCVCodeGen",
+        "LLVMRISCVDesc",
+        "LLVMRISCVInfo",
+        "LLVMExecutionEngine",
+        "LLVMOption",
+        "LLVMMCDisassembler",
+        "LLVMPasses",
+        "LLVMHipStdPar",
+        "LLVMCFGuard",
+        "LLVMCoroutines",
+        "LLVMipo",
+        "LLVMVectorize",
+        "LLVMInstrumentation",
+        "LLVMFrontendOpenMP",
+        "LLVMFrontendOffloading",
+        "LLVMGlobalISel",
+        "LLVMAsmPrinter",
+        "LLVMSelectionDAG",
+        "LLVMCodeGen",
+        "LLVMTarget",
+        "LLVMObjCARCOpts",
+        "LLVMCodeGenTypes",
+        "LLVMIRPrinter",
+        "LLVMScalarOpts",
+        "LLVMInstCombine",
+        "LLVMAggressiveInstCombine",
+        "LLVMTransformUtils",
+        "LLVMBitWriter",
+        "LLVMAnalysis",
+        "LLVMProfileData",
+        "LLVMDebugInfoDWARF",
+        "LLVMObject",
+        "LLVMMCParser",
+        "LLVMIRReader",
+        "LLVMAsmParser",
+        "LLVMMC",
+        "LLVMDebugInfoCodeView",
+        "LLVMBitReader",
+        "LLVMRemarks",
+        "LLVMBitstreamReader",
     ] {
         println!("cargo:rustc-link-lib=static={lib}");
     }
 
-    #[cfg(target_os = "linux")]
-    {
+    let target_os = std::env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
+    if target_os == "linux" {
         println!("cargo:rustc-link-lib=dylib=stdc++");
         println!("cargo:rustc-link-lib=tinfo");
     }
 }
 
 fn main() {
-    llvm_config("--cxxflags")
+    println!("cargo:rerun-if-env-changed={}", LLVM_LINK_PREFIX);
+
+    let llvm_config_path = locate_llvm_config();
+
+    llvm_config(&llvm_config_path, "--cxxflags")
         .split_whitespace()
         .fold(&mut cc::Build::new(), |builder, flag| builder.flag(flag))
         .flag("-Wno-unused-parameter")
         .cpp(true)
         .file("src/linker.cpp")
         .compile("liblinker.a");
 
-    set_rustc_link_flags();
+    set_rustc_link_flags(&llvm_config_path);
 
     println!("cargo:rerun-if-changed=build.rs");
 }

crates/solidity/Cargo.toml

@@ -24,7 +24,7 @@ thiserror = { workspace = true }
 anyhow = { workspace = true }
 which = { workspace = true }
 path-slash = { workspace = true }
-rayon = { workspace = true }
+rayon = { workspace = true, optional = true }
 
 serde = { workspace = true }
 serde_json = { workspace = true }
@@ -41,6 +41,17 @@ inkwell = { workspace = true }
 revive-common = { workspace = true }
 revive-llvm-context = { workspace = true }
 
-
 [target.'cfg(target_env = "musl")'.dependencies]
 mimalloc = { version = "*", default-features = false }
+
+[target.'cfg(target_os = "emscripten")'.dependencies]
+libc = { workspace = true }
+inkwell = { workspace = true, features = ["target-riscv", "llvm18-0-no-llvm-linking"]}
+
+[features]
+default = []
+parallel = ["rayon"]
+
+# Enable parallel by default only for non-emscripten targets
+[target.'cfg(not(target_os = "emscripten"))'.features]
+default = ["parallel"]