259 lines
7.6 KiB
Rust
259 lines
7.6 KiB
Rust
#![allow(unreachable_code)]
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use std::env;
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use std::io::{Error, ErrorKind, Result};
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use std::path::{Path, PathBuf};
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use std::process::Command;
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#[cfg_attr(
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all(
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feature = "vendored",
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any(
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feature = "lua54",
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feature = "lua53",
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feature = "lua52",
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feature = "lua51",
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feature = "luajit"
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)
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),
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path = "find_vendored.rs"
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)]
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#[cfg_attr(
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all(
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not(feature = "vendored"),
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any(
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feature = "lua54",
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feature = "lua53",
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feature = "lua52",
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feature = "lua51",
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feature = "luajit"
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)
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),
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path = "find_normal.rs"
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)]
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#[cfg_attr(
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not(any(
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feature = "lua54",
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feature = "lua53",
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feature = "lua52",
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feature = "lua51",
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feature = "luajit"
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)),
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path = "find_dummy.rs"
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)]
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mod find;
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trait CommandExt {
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fn execute(&mut self) -> Result<()>;
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}
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impl CommandExt for Command {
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/// Execute the command and return an error if it exited with a failure status.
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fn execute(&mut self) -> Result<()> {
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self.status()
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.and_then(|status| {
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if status.success() {
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Ok(())
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} else {
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Err(Error::new(ErrorKind::Other, "non-zero exit code"))
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}
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})
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.map_err(|_| {
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Error::new(
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ErrorKind::Other,
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format!("The command {:?} did not run successfully.", self),
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)
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})
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}
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}
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fn build_glue<P: AsRef<Path> + std::fmt::Debug>(include_path: &P) {
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let build_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
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let mut config = cc::Build::new();
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config.include(include_path);
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// Compile and run glue.c
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let glue = build_dir.join("glue");
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config
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.get_compiler()
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.to_command()
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.arg("src/ffi/glue/glue.c")
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.arg("-o")
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.arg(&glue)
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.execute()
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.unwrap();
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Command::new(glue)
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.arg(build_dir.join("glue.rs"))
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.execute()
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.unwrap();
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}
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// When cross-compiling, we cannot use `build_glue` as we cannot run the generated
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// executable. Instead, let's take a stab at synthesizing the likely values.
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// If you're cross-compiling and using a non-vendored library then there is a chance
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// that the values selected here may be incorrect, but we have no way to determine
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// that here.
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fn generate_glue() -> std::io::Result<()> {
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use std::io::Write;
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let build_dir = PathBuf::from(env::var_os("OUT_DIR").unwrap());
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let mut glue = std::fs::File::create(build_dir.join("glue.rs"))?;
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write!(
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glue,
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"/* This file was generated by build/main.rs; do not modify by hand */\n"
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)?;
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write!(glue, "use std::os::raw::*;\n")?;
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// We can't statically determine the default paths.
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// It is possible though to use something like lazy_static! to create a new
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// lua context and extract that information.
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// For my (@wez) purposes, I actually don't want there to be a default path,
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// so I'm just leaving this blank for the moment.
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write!(glue, "pub const LUA_PATH_DEFAULT: &str = \"\";\n")?;
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write!(glue, "pub const LUA_CPATH_DEFAULT: &str = \"\";\n")?;
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write!(
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glue,
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"#[cfg(windows)] pub const LUA_DIRSEP: &str = \"\\\\\";\n"
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)?;
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write!(glue, "#[cfg(unix)] pub const LUA_DIRSEP: &str = \"/\";\n")?;
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let pointer_bit_width: usize = env::var("CARGO_CFG_TARGET_POINTER_WIDTH")
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.unwrap()
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.parse()
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.unwrap();
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write!(
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glue,
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"pub const LUA_EXTRASPACE: c_int = {} / 8;\n",
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pointer_bit_width
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)?;
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// This is generally hardcoded to this size
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write!(glue, "pub const LUA_IDSIZE: c_int = 60;\n")?;
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write!(glue, "pub const LUAL_BUFFERSIZE: c_int = 16 * ({} / 8) * std::mem::size_of::<LUA_NUMBER>() as c_int;\n", pointer_bit_width)?;
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// Unless the target is restricted, the defaults are 64 bit
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write!(glue, "pub type LUA_NUMBER = c_double;\n")?;
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write!(glue, "pub type LUA_INTEGER = i64;\n")?;
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write!(glue, "pub type LUA_UNSIGNED = u64;\n")?;
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let version = if cfg!(feature = "luajit") || cfg!(feature = "lua51") {
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// Note: luajit is ~lua 5.1, but it doesn't itself cross compile
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(5, 1, 0)
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} else if cfg!(feature = "lua52") {
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(5, 2, 0)
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} else if cfg!(feature = "lua53") {
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(5, 3, 0)
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} else if cfg!(feature = "lua54") {
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(5, 4, 0)
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} else {
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unreachable!();
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};
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write!(
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glue,
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"pub const LUA_VERSION_NUM: c_int = {};\n",
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(version.0 * 100) + version.1
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)?;
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write!(
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glue,
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"pub const LUA_VERSION: &str = \"Lua {}.{}\";\n",
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version.0, version.1
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)?;
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write!(
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glue,
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"pub const LUA_RELEASE: &str = \"Lua {}.{}.{}\";\n",
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version.0, version.1, version.2
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)?;
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let max_stack = if pointer_bit_width >= 32 {
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1_000_000
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} else {
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15_000
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};
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write!(
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glue,
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"pub const LUA_REGISTRYINDEX: c_int = -{} - 1000;\n",
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max_stack
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)?;
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// These two are only defined in lua 5.1
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write!(glue, "pub const LUA_ENVIRONINDEX: c_int = -10001;\n")?;
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write!(glue, "pub const LUA_GLOBALSINDEX: c_int = -10002;\n")?;
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// This is only defined in lua 5.3 and up, but we can always generate its value here,
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// even if we don't use it.
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// This matches the default definition in lauxlib.h
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write!(glue, "pub const LUAL_NUMSIZES: c_int = std::mem::size_of::<LUA_INTEGER>() as c_int * 16 + std::mem::size_of::<LUA_NUMBER>() as c_int;\n")?;
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write!(
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glue,
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r#"
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pub const LUA_BITLIBNAME: &str = "bit32";
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pub const LUA_COLIBNAME: &str = "coroutine";
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pub const LUA_DBLIBNAME: &str = "debug";
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pub const LUA_IOLIBNAME: &str = "io";
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pub const LUA_LOADLIBNAME: &str = "package";
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pub const LUA_MATHLIBNAME: &str = "math";
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pub const LUA_OSLIBNAME: &str = "os";
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pub const LUA_STRLIBNAME: &str = "string";
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pub const LUA_TABLIBNAME: &str = "table";
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pub const LUA_UTF8LIBNAME: &str = "utf8";
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"#
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)?;
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Ok(())
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}
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fn main() {
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#[cfg(not(any(
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feature = "lua54",
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feature = "lua53",
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feature = "lua52",
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feature = "lua51",
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feature = "luajit"
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)))]
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compile_error!("You must enable one of the features: lua54, lua53, lua52, lua51, luajit");
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#[cfg(all(
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feature = "lua54",
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any(
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feature = "lua53",
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feature = "lua52",
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feature = "lua51",
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feature = "luajit"
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)
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))]
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compile_error!("You can enable only one of the features: lua54, lua53, lua52, lua51, luajit");
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#[cfg(all(
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feature = "lua53",
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any(feature = "lua52", feature = "lua51", feature = "luajit")
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))]
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compile_error!("You can enable only one of the features: lua54, lua53, lua52, lua51, luajit");
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#[cfg(all(feature = "lua52", any(feature = "lua51", feature = "luajit")))]
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compile_error!("You can enable only one of the features: lua54, lua53, lua52, lua51, luajit");
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#[cfg(all(feature = "lua51", feature = "luajit"))]
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compile_error!("You can enable only one of the features: lua54, lua53, lua52, lua51, luajit");
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// We don't support "vendored module" mode on windows
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#[cfg(all(feature = "vendored", feature = "module", target_os = "windows"))]
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compile_error!(
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"Vendored (static) builds are not supported for modules on Windows.\n"
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+ "Please, use `pkg-config` or custom mode to link to a Lua dll."
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);
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let include_dir = find::probe_lua();
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if env::var("TARGET").unwrap() != env::var("HOST").unwrap() {
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generate_glue().unwrap();
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} else {
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build_glue(&include_dir);
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}
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}
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