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Code Editor : generate_rust_target.rs
// SPDX-License-Identifier: GPL-2.0 //! The custom target specification file generator for `rustc`. //! //! To configure a target from scratch, a JSON-encoded file has to be passed //! to `rustc` (introduced in [RFC 131]). These options and the file itself are //! unstable. Eventually, `rustc` should provide a way to do this in a stable //! manner. For instance, via command-line arguments. Therefore, this file //! should avoid using keys which can be set via `-C` or `-Z` options. //! //! [RFC 131]: https://rust-lang.github.io/rfcs/0131-target-specification.html use std::{ collections::HashMap, fmt::{Display, Formatter, Result}, io::BufRead, }; enum Value { Boolean(bool), Number(i32), String(String), Object(Object), } type Object = Vec<(String, Value)>; /// Minimal "almost JSON" generator (e.g. no `null`s, no arrays, no escaping), /// enough for this purpose. impl Display for Value { fn fmt(&self, formatter: &mut Formatter<'_>) -> Result { match self { Value::Boolean(boolean) => write!(formatter, "{}", boolean), Value::Number(number) => write!(formatter, "{}", number), Value::String(string) => write!(formatter, "\"{}\"", string), Value::Object(object) => { formatter.write_str("{")?; if let [ref rest @ .., ref last] = object[..] { for (key, value) in rest { write!(formatter, "\"{}\": {},", key, value)?; } write!(formatter, "\"{}\": {}", last.0, last.1)?; } formatter.write_str("}") } } } } struct TargetSpec(Object); impl TargetSpec { fn new() -> TargetSpec { TargetSpec(Vec::new()) } } trait Push<T> { fn push(&mut self, key: &str, value: T); } impl Push<bool> for TargetSpec { fn push(&mut self, key: &str, value: bool) { self.0.push((key.to_string(), Value::Boolean(value))); } } impl Push<i32> for TargetSpec { fn push(&mut self, key: &str, value: i32) { self.0.push((key.to_string(), Value::Number(value))); } } impl Push<String> for TargetSpec { fn push(&mut self, key: &str, value: String) { self.0.push((key.to_string(), Value::String(value))); } } impl Push<&str> for TargetSpec { fn push(&mut self, key: &str, value: &str) { self.push(key, value.to_string()); } } impl Push<Object> for TargetSpec { fn push(&mut self, key: &str, value: Object) { self.0.push((key.to_string(), Value::Object(value))); } } impl Display for TargetSpec { fn fmt(&self, formatter: &mut Formatter<'_>) -> Result { // We add some newlines for clarity. formatter.write_str("{\n")?; if let [ref rest @ .., ref last] = self.0[..] { for (key, value) in rest { write!(formatter, " \"{}\": {},\n", key, value)?; } write!(formatter, " \"{}\": {}\n", last.0, last.1)?; } formatter.write_str("}") } } struct KernelConfig(HashMap<String, String>); impl KernelConfig { /// Parses `include/config/auto.conf` from `stdin`. fn from_stdin() -> KernelConfig { let mut result = HashMap::new(); let stdin = std::io::stdin(); let mut handle = stdin.lock(); let mut line = String::new(); loop { line.clear(); if handle.read_line(&mut line).unwrap() == 0 { break; } if line.starts_with('#') { continue; } let (key, value) = line.split_once('=').expect("Missing `=` in line."); result.insert(key.to_string(), value.trim_end_matches('\n').to_string()); } KernelConfig(result) } /// Does the option exist in the configuration (any value)? /// /// The argument must be passed without the `CONFIG_` prefix. /// This avoids repetition and it also avoids `fixdep` making us /// depend on it. fn has(&self, option: &str) -> bool { let option = "CONFIG_".to_owned() + option; self.0.contains_key(&option) } } fn main() { let cfg = KernelConfig::from_stdin(); let mut ts = TargetSpec::new(); // `llvm-target`s are taken from `scripts/Makefile.clang`. if cfg.has("X86_64") { ts.push("arch", "x86_64"); ts.push( "data-layout", "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128", ); let mut features = "-3dnow,-3dnowa,-mmx,+soft-float".to_string(); if cfg.has("RETPOLINE") { features += ",+retpoline-external-thunk"; } ts.push("features", features); ts.push("llvm-target", "x86_64-linux-gnu"); ts.push("target-pointer-width", "64"); } else if cfg.has("LOONGARCH") { ts.push("arch", "loongarch64"); ts.push("data-layout", "e-m:e-p:64:64-i64:64-i128:128-n64-S128"); ts.push("features", "-f,-d"); ts.push("llvm-target", "loongarch64-linux-gnusf"); ts.push("llvm-abiname", "lp64s"); ts.push("target-pointer-width", "64"); } else { panic!("Unsupported architecture"); } ts.push("emit-debug-gdb-scripts", false); ts.push("frame-pointer", "may-omit"); ts.push( "stack-probes", vec![("kind".to_string(), Value::String("none".to_string()))], ); // Everything else is LE, whether `CPU_LITTLE_ENDIAN` is declared or not // (e.g. x86). It is also `rustc`'s default. if cfg.has("CPU_BIG_ENDIAN") { ts.push("target-endian", "big"); } println!("{}", ts); }
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