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/*
* Copyright 2018 Mozilla Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
//! Build script for the Baldr <-> Cranelift bindings.
//!
//! This file is executed by cargo when this crate is built. It generates the
//! `$OUT_DIR/bindings.rs` file which is then included by `src/bindings/low_level.rs`.
extern crate bindgen;
use std::env;
use std::fs::File;
use std::io::prelude::*;
use std::path::PathBuf;
fn main() {
// Tell Cargo to regenerate the bindings if the header file changes.
println!("cargo:rerun-if-changed=baldrapi.h");
let mut generator = bindgen::builder()
.parse_callbacks(Box::new(bindgen::CargoCallbacks))
.disable_name_namespacing()
.size_t_is_usize(true)
// We whitelist the Baldr C functions and get the associated types for free.
.whitelist_function("env_.*")
.whitelist_function("global_.*")
.whitelist_function("table_.*")
.whitelist_function("funcType_.*")
.whitelist_function("stackmaps_.*")
.whitelist_type("Cranelift.*")
// The enum classes defined in baldrapi.h and WasmBinaryConstants are all Rust-safe.
.rustified_enum("BD_.*|Trap|TypeCode|TypeIdDescKind")
.whitelist_type("BD_.*|Trap|TypeCode|TypeIdDescKind")
.header("baldrapi.h")
.clang_args(&[
"-x",
"c++",
"-std=gnu++14",
"-fno-sized-deallocation",
"-fno-aligned-new",
"-DRUST_BINDGEN",
])
.clang_arg("-I../..");
match env::var_os("MOZ_TOPOBJDIR") {
Some(path) => {
let path = PathBuf::from(path).join("js/src/rust/extra-bindgen-flags");
let mut extra_flags = String::new();
File::open(&path)
.expect("Failed to open extra-bindgen-flags file")
.read_to_string(&mut extra_flags)
.expect("Failed to read extra-bindgen-flags file");
let display_path = path.to_str().expect("path is utf8 encoded");
println!("cargo:rerun-if-changed={}", display_path);
let extra_flags: Vec<String> = extra_flags
.split_whitespace()
.map(|s| s.to_owned())
.collect();
for flag in extra_flags {
generator = generator.clang_arg(flag);
}
}
None => {
println!("cargo:warning=MOZ_TOPOBJDIR should be set by default, otherwise the build is not guaranted to finish.");
}
}
let command_line_opts = generator.command_line_flags();
// In case of error, bindgen prints to stderr, and the yielded error is the empty type ().
let bindings = generator.generate().unwrap_or_else(|_err| {
panic!(
r#"Unable to generate baldrapi.h bindings:
- flags: {}
"#,
command_line_opts.join(" "),
);
});
// Write the bindings to the $OUT_DIR/bindings.rs file.
let out_path = PathBuf::from(env::var("OUT_DIR").unwrap());
bindings
.write_to_file(out_path.join("bindings.rs"))
.expect("Couldn't write bindings!");
}
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