mirror of
https://github.com/servo/servo.git
synced 2025-06-19 14:48:59 +01:00
640 lines
24 KiB
Rust
640 lines
24 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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mod common {
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use std::env;
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use std::path::PathBuf;
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lazy_static! {
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pub static ref OUTDIR_PATH: PathBuf =
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PathBuf::from(env::var_os("OUT_DIR").unwrap()).join("gecko");
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}
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}
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#[cfg(feature = "bindgen")]
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mod bindings {
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use bindgen::{Builder, CodegenConfig};
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use regex::Regex;
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use std::cmp;
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use std::collections::{HashMap, HashSet};
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use std::env;
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use std::fs::{self, File};
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use std::io::{Read, Write};
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use std::path::{Path, PathBuf};
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use std::process::{exit, Command};
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use std::slice;
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use std::sync::Mutex;
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use std::time::SystemTime;
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use super::common::*;
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use super::super::PYTHON;
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use toml;
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use toml::value::Table;
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const STRUCTS_FILE: &'static str = "structs.rs";
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const BINDINGS_FILE: &'static str = "bindings.rs";
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fn read_config(path: &PathBuf) -> Table {
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println!("cargo:rerun-if-changed={}", path.to_str().unwrap());
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update_last_modified(&path);
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let mut contents = String::new();
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File::open(path)
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.expect("Failed to open config file")
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.read_to_string(&mut contents)
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.expect("Failed to read config file");
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match toml::from_str::<toml::value::Table>(&contents) {
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Ok(result) => result,
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Err(e) => panic!("Failed to parse config file: {}", e),
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}
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}
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lazy_static! {
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static ref CONFIG: Table = {
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// Load Gecko's binding generator config from the source tree.
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let path = PathBuf::from(env::var_os("MOZ_SRC").unwrap())
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.join("layout/style/ServoBindings.toml");
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read_config(&path)
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};
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static ref BUILD_CONFIG: Table = {
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// Load build-specific config overrides.
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// FIXME: We should merge with CONFIG above instead of
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// forcing callers to do it.
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let path = PathBuf::from(env::var_os("MOZ_TOPOBJDIR").unwrap())
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.join("layout/style/bindgen.toml");
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read_config(&path)
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};
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static ref TARGET_INFO: HashMap<String, String> = {
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const TARGET_PREFIX: &'static str = "CARGO_CFG_TARGET_";
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let mut result = HashMap::new();
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for (k, v) in env::vars() {
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if k.starts_with(TARGET_PREFIX) {
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result.insert(k[TARGET_PREFIX.len()..].to_lowercase(), v);
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}
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}
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result
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};
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static ref INCLUDE_RE: Regex = Regex::new(r#"#include\s*"(.+?)""#).unwrap();
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static ref DISTDIR_PATH: PathBuf = {
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let path = PathBuf::from(env::var_os("MOZ_DIST").unwrap());
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if !path.is_absolute() || !path.is_dir() {
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panic!("MOZ_DIST must be an absolute directory, was: {}", path.display());
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}
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path
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};
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static ref SEARCH_PATHS: Vec<PathBuf> = vec![
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DISTDIR_PATH.join("include"),
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DISTDIR_PATH.join("include/nspr"),
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];
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static ref ADDED_PATHS: Mutex<HashSet<PathBuf>> = Mutex::new(HashSet::new());
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static ref LAST_MODIFIED: Mutex<SystemTime> =
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Mutex::new(get_modified_time(&env::current_exe().unwrap())
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.expect("Failed to get modified time of executable"));
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}
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fn get_modified_time(file: &Path) -> Option<SystemTime> {
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file.metadata().and_then(|m| m.modified()).ok()
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}
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fn update_last_modified(file: &Path) {
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let modified = get_modified_time(file).expect("Couldn't get file modification time");
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let mut last_modified = LAST_MODIFIED.lock().unwrap();
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*last_modified = cmp::max(modified, *last_modified);
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}
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fn search_include(name: &str) -> Option<PathBuf> {
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for path in SEARCH_PATHS.iter() {
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let file = path.join(name);
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if file.is_file() {
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update_last_modified(&file);
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return Some(file);
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}
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}
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None
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}
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fn add_headers_recursively(path: PathBuf, added_paths: &mut HashSet<PathBuf>) {
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if added_paths.contains(&path) {
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return;
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}
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let mut file = File::open(&path).unwrap();
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let mut content = String::new();
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file.read_to_string(&mut content).unwrap();
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added_paths.insert(path);
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// Find all includes and add them recursively
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for cap in INCLUDE_RE.captures_iter(&content) {
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if let Some(path) = search_include(cap.get(1).unwrap().as_str()) {
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add_headers_recursively(path, added_paths);
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}
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}
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}
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fn add_include(name: &str) -> String {
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let mut added_paths = ADDED_PATHS.lock().unwrap();
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let file = search_include(name).expect("Include not found!");
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let result = String::from(file.to_str().unwrap());
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add_headers_recursively(file, &mut *added_paths);
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result
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}
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trait BuilderExt {
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fn get_initial_builder() -> Builder;
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fn include<T: Into<String>>(self, file: T) -> Builder;
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fn zero_size_type(self, ty: &str, structs_list: &HashSet<&str>) -> Builder;
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fn borrowed_type(self, ty: &str) -> Builder;
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fn mutable_borrowed_type(self, ty: &str) -> Builder;
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}
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fn add_clang_args(mut builder: Builder, config: &Table, matched_os: &mut bool) -> Builder {
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fn add_args(mut builder: Builder, values: &[toml::Value]) -> Builder {
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for item in values.iter() {
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builder = builder.clang_arg(item.as_str().expect("Expect string in list"));
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}
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builder
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}
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for (k, v) in config.iter() {
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if k == "args" {
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builder = add_args(builder, v.as_array().unwrap().as_slice());
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continue;
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}
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let equal_idx = k.find('=').expect(&format!("Invalid key: {}", k));
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let (target_type, target_value) = k.split_at(equal_idx);
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if TARGET_INFO[target_type] != target_value[1..] {
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continue;
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}
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if target_type == "os" {
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*matched_os = true;
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}
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builder = match *v {
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toml::Value::Table(ref table) => add_clang_args(builder, table, matched_os),
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toml::Value::Array(ref array) => add_args(builder, array),
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_ => panic!("Unknown type"),
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};
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}
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builder
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}
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impl BuilderExt for Builder {
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fn get_initial_builder() -> Builder {
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use bindgen::RustTarget;
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// Disable rust unions, because we replace some types inside of
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// them.
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let mut builder = Builder::default().rust_target(RustTarget::Stable_1_0);
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let rustfmt_path = env::var_os("RUSTFMT")
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// This can be replaced with
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// > .filter(|p| !p.is_empty()).map(PathBuf::from)
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// once we can use 1.27+.
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.and_then(|p| {
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if p.is_empty() {
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None
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} else {
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Some(PathBuf::from(p))
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}
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});
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if let Some(path) = rustfmt_path {
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builder = builder.with_rustfmt(path);
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}
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for dir in SEARCH_PATHS.iter() {
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builder = builder.clang_arg("-I").clang_arg(dir.to_str().unwrap());
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}
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builder = builder.include(add_include("mozilla-config.h"));
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if env::var("CARGO_FEATURE_GECKO_DEBUG").is_ok() {
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builder = builder.clang_arg("-DDEBUG=1").clang_arg("-DJS_DEBUG=1");
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}
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let mut matched_os = false;
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let build_config = CONFIG["build"].as_table().expect("Malformed config file");
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builder = add_clang_args(builder, build_config, &mut matched_os);
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let build_config = BUILD_CONFIG["build"]
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.as_table()
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.expect("Malformed config file");
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builder = add_clang_args(builder, build_config, &mut matched_os);
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if !matched_os {
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panic!("Unknown platform");
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}
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builder
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}
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fn include<T: Into<String>>(self, file: T) -> Builder {
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self.clang_arg("-include").clang_arg(file)
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}
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// This makes an FFI-safe void type that can't be matched on
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// &VoidType is UB to have, because you can match on it
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// to produce a reachable unreachable. If it's wrapped in
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// a struct as a private field it becomes okay again
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//
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// Not 100% sure of how safe this is, but it's what we're using
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// in the XPCOM ffi too
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// https://github.com/nikomatsakis/rust-memory-model/issues/2
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fn zero_size_type(self, ty: &str, structs_list: &HashSet<&str>) -> Builder {
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if !structs_list.contains(ty) {
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self.blacklist_type(ty)
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.raw_line(format!("enum {}Void {{ }}", ty))
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.raw_line(format!("pub struct {0}({0}Void);", ty))
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} else {
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self
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}
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}
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fn borrowed_type(self, ty: &str) -> Builder {
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self.blacklist_type(format!("{}Borrowed", ty))
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.raw_line(format!("pub type {0}Borrowed<'a> = &'a {0};", ty))
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.blacklist_type(format!("{}BorrowedOrNull", ty))
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.raw_line(format!(
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"pub type {0}BorrowedOrNull<'a> = Option<&'a {0}>;",
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ty
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))
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}
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fn mutable_borrowed_type(self, ty: &str) -> Builder {
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self.borrowed_type(ty)
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.blacklist_type(format!("{}BorrowedMut", ty))
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.raw_line(format!("pub type {0}BorrowedMut<'a> = &'a mut {0};", ty))
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.blacklist_type(format!("{}BorrowedMutOrNull", ty))
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.raw_line(format!(
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"pub type {0}BorrowedMutOrNull<'a> = Option<&'a mut {0}>;",
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ty
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))
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}
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}
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struct Fixup {
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pat: String,
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rep: String,
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}
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fn write_binding_file(builder: Builder, file: &str, fixups: &[Fixup]) {
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let out_file = OUTDIR_PATH.join(file);
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if let Some(modified) = get_modified_time(&out_file) {
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// Don't generate the file if nothing it depends on was modified.
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let last_modified = LAST_MODIFIED.lock().unwrap();
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if *last_modified <= modified {
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return;
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}
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}
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let command_line_opts = builder.command_line_flags();
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let result = builder.generate();
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let mut result = match result {
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Ok(bindings) => bindings.to_string(),
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Err(_) => {
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panic!(
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"Failed to generate bindings, flags: {:?}",
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command_line_opts
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);
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},
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};
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for fixup in fixups.iter() {
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result = Regex::new(&fixup.pat)
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.unwrap()
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.replace_all(&result, &*fixup.rep)
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.into_owned()
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.into();
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}
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let bytes = result.into_bytes();
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File::create(&out_file)
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.unwrap()
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.write_all(&bytes)
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.expect("Unable to write output");
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}
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fn get_arc_types() -> Vec<String> {
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// Read the file
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let mut list_file = File::open(DISTDIR_PATH.join("include/mozilla/ServoArcTypeList.h"))
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.expect("Unable to open ServoArcTypeList.h");
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let mut content = String::new();
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list_file
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.read_to_string(&mut content)
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.expect("Fail to read ServoArcTypeList.h");
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// Remove comments
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let block_comment_re = Regex::new(r#"(?s)/\*.*?\*/"#).unwrap();
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let content = block_comment_re.replace_all(&content, "");
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// Extract the list
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let re = Regex::new(r#"^SERVO_ARC_TYPE\(\w+,\s*(\w+)\)$"#).unwrap();
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content
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.lines()
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.map(|line| line.trim())
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.filter(|line| !line.is_empty())
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.map(|line| {
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re.captures(&line)
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.expect(&format!(
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"Unrecognized line in ServoArcTypeList.h: '{}'",
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line
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)).get(1)
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.unwrap()
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.as_str()
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.to_string()
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}).collect()
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}
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struct BuilderWithConfig<'a> {
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builder: Builder,
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config: &'a Table,
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used_keys: HashSet<&'static str>,
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}
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impl<'a> BuilderWithConfig<'a> {
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fn new(builder: Builder, config: &'a Table) -> Self {
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BuilderWithConfig {
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builder,
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config,
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used_keys: HashSet::new(),
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}
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}
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fn handle_list<F>(self, key: &'static str, func: F) -> BuilderWithConfig<'a>
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where
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F: FnOnce(Builder, slice::Iter<'a, toml::Value>) -> Builder,
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{
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let mut builder = self.builder;
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let config = self.config;
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let mut used_keys = self.used_keys;
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if let Some(list) = config.get(key) {
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used_keys.insert(key);
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builder = func(builder, list.as_array().unwrap().as_slice().iter());
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}
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BuilderWithConfig {
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builder,
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config,
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used_keys,
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}
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}
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fn handle_items<F>(self, key: &'static str, mut func: F) -> BuilderWithConfig<'a>
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where
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F: FnMut(Builder, &'a toml::Value) -> Builder,
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{
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self.handle_list(key, |b, iter| iter.fold(b, |b, item| func(b, item)))
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}
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fn handle_str_items<F>(self, key: &'static str, mut func: F) -> BuilderWithConfig<'a>
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where
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F: FnMut(Builder, &'a str) -> Builder,
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{
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self.handle_items(key, |b, item| func(b, item.as_str().unwrap()))
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}
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fn handle_table_items<F>(self, key: &'static str, mut func: F) -> BuilderWithConfig<'a>
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where
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F: FnMut(Builder, &'a Table) -> Builder,
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{
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self.handle_items(key, |b, item| func(b, item.as_table().unwrap()))
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}
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fn handle_common(self, fixups: &mut Vec<Fixup>) -> BuilderWithConfig<'a> {
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self.handle_str_items("headers", |b, item| b.header(add_include(item)))
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.handle_str_items("raw-lines", |b, item| b.raw_line(item))
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.handle_str_items("hide-types", |b, item| b.blacklist_type(item))
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.handle_table_items("fixups", |builder, item| {
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fixups.push(Fixup {
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pat: item["pat"].as_str().unwrap().into(),
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rep: item["rep"].as_str().unwrap().into(),
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});
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builder
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})
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}
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fn get_builder(self) -> Builder {
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for key in self.config.keys() {
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if !self.used_keys.contains(key.as_str()) {
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panic!(format!("Unknown key: {}", key));
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}
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}
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self.builder
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}
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}
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fn generate_structs() {
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let builder = Builder::get_initial_builder()
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.enable_cxx_namespaces()
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.with_codegen_config(CodegenConfig::TYPES | CodegenConfig::VARS);
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let mut fixups = vec![];
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let builder = BuilderWithConfig::new(builder, CONFIG["structs"].as_table().unwrap())
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.handle_common(&mut fixups)
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.handle_str_items("bitfield-enums", |b, item| b.bitfield_enum(item))
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.handle_str_items("rusty-enums", |b, item| b.rustified_enum(item))
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.handle_str_items("whitelist-vars", |b, item| b.whitelist_var(item))
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.handle_str_items("whitelist-types", |b, item| b.whitelist_type(item))
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.handle_str_items("opaque-types", |b, item| b.opaque_type(item))
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.handle_table_items("mapped-generic-types", |builder, item| {
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let generic = item["generic"].as_bool().unwrap();
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let gecko = item["gecko"].as_str().unwrap();
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let servo = item["servo"].as_str().unwrap();
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let gecko_name = gecko.rsplit("::").next().unwrap();
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let gecko = gecko
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.split("::")
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.map(|s| format!("\\s*{}\\s*", s))
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.collect::<Vec<_>>()
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.join("::");
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fixups.push(Fixup {
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pat: format!("\\broot\\s*::\\s*{}\\b", gecko),
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rep: format!("::gecko_bindings::structs::{}", gecko_name),
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});
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builder.blacklist_type(gecko).raw_line(format!(
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"pub type {0}{2} = {1}{2};",
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gecko_name,
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servo,
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if generic { "<T>" } else { "" }
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))
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}).get_builder();
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write_binding_file(builder, STRUCTS_FILE, &fixups);
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}
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fn setup_logging() -> bool {
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use log;
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|
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struct BuildLogger {
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file: Option<Mutex<fs::File>>,
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filter: String,
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}
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impl log::Log for BuildLogger {
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fn enabled(&self, meta: &log::Metadata) -> bool {
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self.file.is_some() && meta.target().contains(&self.filter)
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}
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fn log(&self, record: &log::Record) {
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if !self.enabled(record.metadata()) {
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return;
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}
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let mut file = self.file.as_ref().unwrap().lock().unwrap();
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let _ = writeln!(
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file,
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"{} - {} - {} @ {}:{}",
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record.level(),
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record.target(),
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record.args(),
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record.file().unwrap_or("<unknown>"),
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record.line().unwrap_or(0)
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);
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}
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|
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fn flush(&self) {
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if let Some(ref file) = self.file {
|
|
file.lock().unwrap().flush().unwrap();
|
|
}
|
|
}
|
|
}
|
|
|
|
if let Some(path) = env::var_os("STYLO_BUILD_LOG") {
|
|
log::set_max_level(log::LevelFilter::Debug);
|
|
log::set_boxed_logger(Box::new(BuildLogger {
|
|
file: fs::File::create(path).ok().map(Mutex::new),
|
|
filter: env::var("STYLO_BUILD_FILTER")
|
|
.ok()
|
|
.unwrap_or_else(|| "bindgen".to_owned()),
|
|
})).expect("Failed to set logger.");
|
|
|
|
true
|
|
} else {
|
|
false
|
|
}
|
|
}
|
|
|
|
fn generate_bindings() {
|
|
let builder = Builder::get_initial_builder()
|
|
.disable_name_namespacing()
|
|
.with_codegen_config(CodegenConfig::FUNCTIONS);
|
|
let config = CONFIG["bindings"].as_table().unwrap();
|
|
let mut structs_types = HashSet::new();
|
|
let mut fixups = vec![];
|
|
let mut builder = BuilderWithConfig::new(builder, config)
|
|
.handle_common(&mut fixups)
|
|
.handle_str_items("whitelist-functions", |b, item| b.whitelist_function(item))
|
|
.handle_str_items("structs-types", |mut builder, ty| {
|
|
builder = builder.blacklist_type(ty)
|
|
.raw_line(format!("use gecko_bindings::structs::{};", ty));
|
|
structs_types.insert(ty);
|
|
// TODO this is hacky, figure out a better way to do it without
|
|
// hardcoding everything...
|
|
if ty.starts_with("nsStyle") {
|
|
builder = builder
|
|
.raw_line(format!("unsafe impl Send for {} {{}}", ty))
|
|
.raw_line(format!("unsafe impl Sync for {} {{}}", ty));
|
|
}
|
|
builder
|
|
})
|
|
// TODO This was added due to servo/rust-bindgen#75, but
|
|
// that has been fixed in clang 4.0+. When we switch people
|
|
// to libclang 4.0, we can remove this.
|
|
.handle_table_items("array-types", |builder, item| {
|
|
let cpp_type = item["cpp-type"].as_str().unwrap();
|
|
let rust_type = item["rust-type"].as_str().unwrap();
|
|
builder
|
|
.raw_line(format!(concat!("pub type nsTArrayBorrowed_{}<'a> = ",
|
|
"&'a mut ::gecko_bindings::structs::nsTArray<{}>;"),
|
|
cpp_type, rust_type))
|
|
})
|
|
.handle_table_items("servo-owned-types", |mut builder, item| {
|
|
let name = item["name"].as_str().unwrap();
|
|
builder = builder.blacklist_type(format!("{}Owned", name))
|
|
.raw_line(format!("pub type {0}Owned = ::gecko_bindings::sugar::ownership::Owned<{0}>;", name))
|
|
.blacklist_type(format!("{}OwnedOrNull", name))
|
|
.raw_line(format!(concat!("pub type {0}OwnedOrNull = ",
|
|
"::gecko_bindings::sugar::ownership::OwnedOrNull<{0}>;"), name))
|
|
.mutable_borrowed_type(name);
|
|
if item["opaque"].as_bool().unwrap() {
|
|
builder = builder.zero_size_type(name, &structs_types);
|
|
}
|
|
builder
|
|
})
|
|
.handle_str_items("servo-immutable-borrow-types", |b, ty| b.borrowed_type(ty))
|
|
// Right now the only immutable borrow types are ones which we import
|
|
// from the |structs| module. As such, we don't need to create an opaque
|
|
// type with zero_size_type. If we ever introduce immutable borrow types
|
|
// which _do_ need to be opaque, we'll need a separate mode.
|
|
.handle_str_items("servo-borrow-types", |b, ty| b.mutable_borrowed_type(ty))
|
|
.get_builder();
|
|
for ty in get_arc_types().iter() {
|
|
builder = builder
|
|
.blacklist_type(format!("{}Strong", ty))
|
|
.raw_line(format!(
|
|
"pub type {0}Strong = ::gecko_bindings::sugar::ownership::Strong<{0}>;",
|
|
ty
|
|
)).borrowed_type(ty)
|
|
.zero_size_type(ty, &structs_types);
|
|
}
|
|
write_binding_file(builder, BINDINGS_FILE, &fixups);
|
|
}
|
|
|
|
fn generate_atoms() {
|
|
let script = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap())
|
|
.join("gecko")
|
|
.join("regen_atoms.py");
|
|
println!("cargo:rerun-if-changed={}", script.display());
|
|
let status = Command::new(&*PYTHON)
|
|
.arg(&script)
|
|
.arg(DISTDIR_PATH.as_os_str())
|
|
.arg(OUTDIR_PATH.as_os_str())
|
|
.status()
|
|
.unwrap();
|
|
if !status.success() {
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
pub fn generate() {
|
|
use std::thread;
|
|
macro_rules! run_tasks {
|
|
($($task:expr,)+) => {
|
|
if setup_logging() {
|
|
$($task;)+
|
|
} else {
|
|
let threads = vec![$( thread::spawn(|| $task) ),+];
|
|
for thread in threads.into_iter() {
|
|
thread.join().unwrap();
|
|
}
|
|
}
|
|
}
|
|
}
|
|
run_tasks! {
|
|
generate_structs(),
|
|
generate_bindings(),
|
|
generate_atoms(),
|
|
}
|
|
|
|
for path in ADDED_PATHS.lock().unwrap().iter() {
|
|
println!("cargo:rerun-if-changed={}", path.to_str().unwrap());
|
|
}
|
|
}
|
|
}
|
|
|
|
#[cfg(not(feature = "bindgen"))]
|
|
mod bindings {
|
|
use std::{env, fs, io};
|
|
use std::path::{Path, PathBuf};
|
|
use super::common::*;
|
|
|
|
/// Copy contents of one directory into another.
|
|
/// It currently only does a shallow copy.
|
|
fn copy_dir<P, Q, F>(from: P, to: Q, callback: F) -> io::Result<()>
|
|
where
|
|
P: AsRef<Path>,
|
|
Q: AsRef<Path>,
|
|
F: Fn(&Path),
|
|
{
|
|
let to = to.as_ref();
|
|
for entry in from.as_ref().read_dir()? {
|
|
let entry = entry?;
|
|
let path = entry.path();
|
|
callback(&path);
|
|
fs::copy(&path, to.join(entry.file_name()))?;
|
|
}
|
|
Ok(())
|
|
}
|
|
|
|
pub fn generate() {
|
|
let dir = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").unwrap()).join("gecko/generated");
|
|
println!("cargo:rerun-if-changed={}", dir.display());
|
|
copy_dir(&dir, &*OUTDIR_PATH, |path| {
|
|
println!("cargo:rerun-if-changed={}", path.display());
|
|
}).expect("Fail to copy generated files to out dir");
|
|
}
|
|
}
|
|
|
|
pub fn generate() {
|
|
use self::common::*;
|
|
use std::fs;
|
|
println!("cargo:rerun-if-changed=build_gecko.rs");
|
|
fs::create_dir_all(&*OUTDIR_PATH).unwrap();
|
|
bindings::generate();
|
|
}
|