1 files changed, 101 insertions, 0 deletions
diff --git a/build/wasm.js b/build/wasm.js
new file mode 100644
index 0000000..fd90ac2
--- /dev/null
+++ b/build/wasm.js
@@ -0,0 +1,101 @@
+'use strict'
+
+const { execSync } = require('child_process')
+const { writeFileSync, readFileSync } = require('fs')
+const { join, resolve } = require('path')
+
+const ROOT = resolve(__dirname, '../')
+const WASM_SRC = resolve(__dirname, '../deps/llhttp')
+const WASM_OUT = resolve(__dirname, '../lib/llhttp')
+const DOCKERFILE = resolve(__dirname, './Dockerfile')
+
+let platform = process.env.WASM_PLATFORM
+if (!platform && process.argv[2]) {
+  platform = execSync('docker info -f "{{.OSType}}/{{.Architecture}}"').toString().trim()
+}
+
+if (process.argv[2] === '--prebuild') {
+  const cmd = `docker build --platform=${platform.toString().trim()} -t llhttp_wasm_builder -f ${DOCKERFILE} ${ROOT}`
+
+  console.log(`> ${cmd}\n\n`)
+  execSync(cmd, { stdio: 'inherit' })
+
+  process.exit(0)
+}
+
+if (process.argv[2] === '--docker') {
+  let cmd = `docker run --rm -it --platform=${platform.toString().trim()}`
+  if (process.platform === 'linux') {
+    cmd += ` --user ${process.getuid()}:${process.getegid()}`
+  }
+
+  cmd += ` --mount type=bind,source=${ROOT}/lib/llhttp,target=/home/node/undici/lib/llhttp llhttp_wasm_builder node build/wasm.js`
+  console.log(`> ${cmd}\n\n`)
+  execSync(cmd, { stdio: 'inherit' })
+  process.exit(0)
+}
+
+// Gather information about the tools used for the build
+const buildInfo = execSync('apk info -v').toString()
+if (!buildInfo.includes('wasi-sdk')) {
+  console.log('Failed to generate build environment information')
+  process.exit(-1)
+}
+writeFileSync(join(WASM_OUT, 'wasm_build_env.txt'), buildInfo)
+
+// Build wasm binary
+execSync(`clang \
+ --sysroot=/usr/share/wasi-sysroot \
+ -target wasm32-unknown-wasi \
+ -Ofast \
+ -fno-exceptions \
+ -fvisibility=hidden \
+ -mexec-model=reactor \
+ -Wl,-error-limit=0 \
+ -Wl,-O3 \
+ -Wl,--lto-O3 \
+ -Wl,--strip-all \
+ -Wl,--allow-undefined \
+ -Wl,--export-dynamic \
+ -Wl,--export-table \
+ -Wl,--export=malloc \
+ -Wl,--export=free \
+ -Wl,--no-entry \
+ ${join(WASM_SRC, 'src')}/*.c \
+ -I${join(WASM_SRC, 'include')} \
+ -o ${join(WASM_OUT, 'llhttp.wasm')}`, { stdio: 'inherit' })
+
+const base64Wasm = readFileSync(join(WASM_OUT, 'llhttp.wasm')).toString('base64')
+writeFileSync(
+  join(WASM_OUT, 'llhttp-wasm.js'),
+  `module.exports = '${base64Wasm}'\n`
+)
+
+// Build wasm simd binary
+execSync(`clang \
+ --sysroot=/usr/share/wasi-sysroot \
+ -target wasm32-unknown-wasi \
+ -msimd128 \
+ -Ofast \
+ -fno-exceptions \
+ -fvisibility=hidden \
+ -mexec-model=reactor \
+ -Wl,-error-limit=0 \
+ -Wl,-O3 \
+ -Wl,--lto-O3 \
+ -Wl,--strip-all \
+ -Wl,--allow-undefined \
+ -Wl,--export-dynamic \
+ -Wl,--export-table \
+ -Wl,--export=malloc \
+ -Wl,--export=free \
+ -Wl,--no-entry \
+ ${join(WASM_SRC, 'src')}/*.c \
+ -I${join(WASM_SRC, 'include')} \
+ -o ${join(WASM_OUT, 'llhttp_simd.wasm')}`, { stdio: 'inherit' })
+
+const base64WasmSimd = readFileSync(join(WASM_OUT, 'llhttp_simd.wasm')).toString('base64')
+writeFileSync(
+  join(WASM_OUT, 'llhttp_simd-wasm.js'),
+  `module.exports = '${base64WasmSimd}'\n`
+)