// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! The Rust compiler.
//!
//! # Note
//!
//! This API is completely unstable and subject to change.
#![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
html_root_url = "https://doc.rust-lang.org/nightly/")]
#![feature(box_syntax)]
#![cfg_attr(unix, feature(libc))]
#![feature(nll)]
#![feature(quote)]
#![feature(rustc_diagnostic_macros)]
#![feature(slice_sort_by_cached_key)]
#![feature(set_stdio)]
#![feature(rustc_stack_internals)]
#![feature(no_debug)]
#![recursion_limit="256"]
extern crate arena;
pub extern crate getopts;
extern crate graphviz;
extern crate env_logger;
#[cfg(unix)]
extern crate libc;
extern crate rustc_rayon as rayon;
extern crate rustc;
extern crate rustc_allocator;
extern crate rustc_target;
extern crate rustc_borrowck;
extern crate rustc_data_structures;
extern crate rustc_errors as errors;
extern crate rustc_passes;
extern crate rustc_lint;
extern crate rustc_plugin;
extern crate rustc_privacy;
extern crate rustc_incremental;
extern crate rustc_metadata;
extern crate rustc_mir;
extern crate rustc_resolve;
extern crate rustc_save_analysis;
extern crate rustc_traits;
extern crate rustc_codegen_utils;
extern crate rustc_typeck;
extern crate scoped_tls;
extern crate serialize;
extern crate smallvec;
#[macro_use]
extern crate log;
extern crate syntax;
extern crate syntax_ext;
extern crate syntax_pos;
// Note that the linkage here should be all that we need, on Linux we're not
// prefixing the symbols here so this should naturally override our default
// allocator. On OSX it should override via the zone allocator. We shouldn't
// enable this by default on other platforms, so other platforms aren't handled
// here yet.
#[cfg(feature = "jemalloc-sys")]
extern crate jemalloc_sys;
use driver::CompileController;
use pretty::{PpMode, UserIdentifiedItem};
use rustc_resolve as resolve;
use rustc_save_analysis as save;
use rustc_save_analysis::DumpHandler;
use rustc_data_structures::sync::{self, Lrc};
use rustc_data_structures::OnDrop;
use rustc::session::{self, config, Session, build_session, CompileResult};
use rustc::session::CompileIncomplete;
use rustc::session::config::{Input, PrintRequest, ErrorOutputType};
use rustc::session::config::nightly_options;
use rustc::session::filesearch;
use rustc::session::{early_error, early_warn};
use rustc::lint::Lint;
use rustc::lint;
use rustc_metadata::locator;
use rustc_metadata::cstore::CStore;
use rustc_metadata::dynamic_lib::DynamicLibrary;
use rustc::util::common::{time, ErrorReported};
use rustc_codegen_utils::codegen_backend::CodegenBackend;
use serialize::json::ToJson;
use std::any::Any;
use std::borrow::Cow;
use std::cmp::max;
use std::default::Default;
use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
use std::env;
use std::error::Error;
use std::ffi::OsString;
use std::fmt::{self, Display};
use std::io::{self, Read, Write};
use std::mem;
use std::panic;
use std::path::{PathBuf, Path};
use std::process::{self, Command, Stdio};
use std::str;
use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
use std::sync::{Once, ONCE_INIT};
use std::thread;
use syntax::ast;
use syntax::source_map::{SourceMap, FileLoader, RealFileLoader};
use syntax::feature_gate::{GatedCfg, UnstableFeatures};
use syntax::parse::{self, PResult};
use syntax_pos::{DUMMY_SP, MultiSpan, FileName};
#[cfg(test)]
mod test;
pub mod profile;
pub mod driver;
pub mod pretty;
mod proc_macro_decls;
pub mod target_features {
use syntax::ast;
use syntax::symbol::Symbol;
use rustc::session::Session;
use rustc_codegen_utils::codegen_backend::CodegenBackend;
/// Add `target_feature = "..."` cfgs for a variety of platform
/// specific features (SSE, NEON etc.).
///
/// This is performed by checking whether a whitelisted set of
/// features is available on the target machine, by querying LLVM.
pub fn add_configuration(cfg: &mut ast::CrateConfig,
sess: &Session,
codegen_backend: &dyn CodegenBackend) {
let tf = Symbol::intern("target_feature");
cfg.extend(codegen_backend.target_features(sess).into_iter().map(|feat| (tf, Some(feat))));
if sess.crt_static_feature() {
cfg.insert((tf, Some(Symbol::intern("crt-static"))));
}
}
}
/// Exit status code used for successful compilation and help output.
pub const EXIT_SUCCESS: isize = 0;
/// Exit status code used for compilation failures and invalid flags.
pub const EXIT_FAILURE: isize = 1;
const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.\
md#bug-reports";
const ICE_REPORT_COMPILER_FLAGS: &[&str] = &["Z", "C", "crate-type"];
const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &[&str] = &["metadata", "extra-filename"];
const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &[&str] = &["incremental"];
pub fn abort_on_err<T>(result: Result<T, CompileIncomplete>, sess: &Session) -> T {
match result {
Err(CompileIncomplete::Errored(ErrorReported)) => {
sess.abort_if_errors();
panic!("error reported but abort_if_errors didn't abort???");
}
Err(CompileIncomplete::Stopped) => {
sess.fatal("compilation terminated");
}
Ok(x) => x,
}
}
pub fn run<F>(run_compiler: F) -> isize
where F: FnOnce() -> (CompileResult, Option<Session>) + Send + 'static
{
let result = monitor(move || {
syntax::with_globals(|| {
let (result, session) = run_compiler();
if let Err(CompileIncomplete::Errored(_)) = result {
match session {
Some(sess) => {
sess.abort_if_errors();
panic!("error reported but abort_if_errors didn't abort???");
}
None => {
let emitter =
errors::emitter::EmitterWriter::stderr(
errors::ColorConfig::Auto,
None,
true,
false
);
let handler = errors::Handler::with_emitter(true, false, Box::new(emitter));
handler.emit(&MultiSpan::new(),
"aborting due to previous error(s)",
errors::Level::Fatal);
panic::resume_unwind(Box::new(errors::FatalErrorMarker));
}
}
}
});
});
match result {
Ok(()) => EXIT_SUCCESS,
Err(_) => EXIT_FAILURE,
}
}
fn load_backend_from_dylib(path: &Path) -> fn() -> Box<dyn CodegenBackend> {
// Note that we're specifically using `open_global_now` here rather than
// `open`, namely we want the behavior on Unix of RTLD_GLOBAL and RTLD_NOW,
// where NOW means "bind everything right now" because we don't want
// surprises later on and RTLD_GLOBAL allows the symbols to be made
// available for future dynamic libraries opened. This is currently used by
// loading LLVM and then making its symbols available for other dynamic
// libraries.
let lib = DynamicLibrary::open_global_now(path).unwrap_or_else(|err| {
let err = format!("couldn't load codegen backend {:?}: {:?}", path, err);
early_error(ErrorOutputType::default(), &err);
});
unsafe {
match lib.symbol("__rustc_codegen_backend") {
Ok(f) => {
mem::forget(lib);
mem::transmute::<*mut u8, _>(f)
}
Err(e) => {
let err = format!("couldn't load codegen backend as it \
doesn't export the `__rustc_codegen_backend` \
symbol: {:?}", e);
early_error(ErrorOutputType::default(), &err);
}
}
}
}
pub fn get_codegen_backend(sess: &Session) -> Box<dyn CodegenBackend> {
static INIT: Once = ONCE_INIT;
#[allow(deprecated)]
#[no_debug]
static mut LOAD: fn() -> Box<dyn CodegenBackend> = || unreachable!();
INIT.call_once(|| {
let codegen_name = sess.opts.debugging_opts.codegen_backend.as_ref()
.unwrap_or(&sess.target.target.options.codegen_backend);
let backend = match &codegen_name[..] {
"metadata_only" => {
rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::boxed
}
filename if filename.contains(".") => {
load_backend_from_dylib(filename.as_ref())
}
codegen_name => get_codegen_sysroot(codegen_name),
};
unsafe {
LOAD = backend;
}
});
let backend = unsafe { LOAD() };
backend.init(sess);
backend
}
fn get_codegen_sysroot(backend_name: &str) -> fn() -> Box<dyn CodegenBackend> {
// For now we only allow this function to be called once as it'll dlopen a
// few things, which seems to work best if we only do that once. In
// general this assertion never trips due to the once guard in `get_codegen_backend`,
// but there's a few manual calls to this function in this file we protect
// against.
static LOADED: AtomicBool = ATOMIC_BOOL_INIT;
assert!(!LOADED.fetch_or(true, Ordering::SeqCst),
"cannot load the default codegen backend twice");
// When we're compiling this library with `--test` it'll run as a binary but
// not actually exercise much functionality. As a result most of the logic
// here is defunkt (it assumes we're a dynamic library in a sysroot) so
// let's just return a dummy creation function which won't be used in
// general anyway.
if cfg!(test) {
return rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::boxed
}
let target = session::config::host_triple();
let mut sysroot_candidates = vec![filesearch::get_or_default_sysroot()];
let path = current_dll_path()
.and_then(|s| s.canonicalize().ok());
if let Some(dll) = path {
// use `parent` twice to chop off the file name and then also the
// directory containing the dll which should be either `lib` or `bin`.
if let Some(path) = dll.parent().and_then(|p| p.parent()) {
// The original `path` pointed at the `rustc_driver` crate's dll.
// Now that dll should only be in one of two locations. The first is
// in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
// other is the target's libdir, for example
// `$sysroot/lib/rustlib/$target/lib/*.dll`.
//
// We don't know which, so let's assume that if our `path` above
// ends in `$target` we *could* be in the target libdir, and always
// assume that we may be in the main libdir.
sysroot_candidates.push(path.to_owned());
if path.ends_with(target) {
sysroot_candidates.extend(path.parent() // chop off `$target`
.and_then(|p| p.parent()) // chop off `rustlib`
.and_then(|p| p.parent()) // chop off `lib`
.map(|s| s.to_owned()));
}
}
}
let sysroot = sysroot_candidates.iter()
.map(|sysroot| {
let libdir = filesearch::relative_target_lib_path(&sysroot, &target);
sysroot.join(libdir).with_file_name(
option_env!("CFG_CODEGEN_BACKENDS_DIR").unwrap_or("codegen-backends"))
})
.filter(|f| {
info!("codegen backend candidate: {}", f.display());
f.exists()
})
.next();
let sysroot = sysroot.unwrap_or_else(|| {
let candidates = sysroot_candidates.iter()
.map(|p| p.display().to_string())
.collect::<Vec<_>>()
.join("\n* ");
let err = format!("failed to find a `codegen-backends` folder \
in the sysroot candidates:\n* {}", candidates);
early_error(ErrorOutputType::default(), &err);
});
info!("probing {} for a codegen backend", sysroot.display());
let d = sysroot.read_dir().unwrap_or_else(|e| {
let err = format!("failed to load default codegen backend, couldn't \
read `{}`: {}", sysroot.display(), e);
early_error(ErrorOutputType::default(), &err);
});
let mut file: Option<PathBuf> = None;
let expected_name = format!("rustc_codegen_llvm-{}", backend_name);
for entry in d.filter_map(|e| e.ok()) {
let path = entry.path();
let filename = match path.file_name().and_then(|s| s.to_str()) {
Some(s) => s,
None => continue,
};
if !(filename.starts_with(DLL_PREFIX) && filename.ends_with(DLL_SUFFIX)) {
continue
}
let name = &filename[DLL_PREFIX.len() .. filename.len() - DLL_SUFFIX.len()];
if name != expected_name {
continue
}
if let Some(ref prev) = file {
let err = format!("duplicate codegen backends found\n\
first: {}\n\
second: {}\n\
", prev.display(), path.display());
early_error(ErrorOutputType::default(), &err);
}
file = Some(path.clone());
}
match file {
Some(ref s) => return load_backend_from_dylib(s),
None => {
let err = format!("failed to load default codegen backend for `{}`, \
no appropriate codegen dylib found in `{}`",
backend_name, sysroot.display());
early_error(ErrorOutputType::default(), &err);
}
}
#[cfg(unix)]
fn current_dll_path() -> Option<PathBuf> {
use std::ffi::{OsStr, CStr};
use std::os::unix::prelude::*;
unsafe {
let addr = current_dll_path as usize as *mut _;
let mut info = mem::zeroed();
if libc::dladdr(addr, &mut info) == 0 {
info!("dladdr failed");
return None
}
if info.dli_fname.is_null() {
info!("dladdr returned null pointer");
return None
}
let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
let os = OsStr::from_bytes(bytes);
Some(PathBuf::from(os))
}
}
#[cfg(windows)]
fn current_dll_path() -> Option<PathBuf> {
use std::ffi::OsString;
use std::os::windows::prelude::*;
extern "system" {
fn GetModuleHandleExW(dwFlags: u32,
lpModuleName: usize,
phModule: *mut usize) -> i32;
fn GetModuleFileNameW(hModule: usize,
lpFilename: *mut u16,
nSize: u32) -> u32;
}
const GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS: u32 = 0x00000004;
unsafe {
let mut module = 0;
let r = GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
current_dll_path as usize,
&mut module);
if r == 0 {
info!("GetModuleHandleExW failed: {}", io::Error::last_os_error());
return None
}
let mut space = Vec::with_capacity(1024);
let r = GetModuleFileNameW(module,
space.as_mut_ptr(),
space.capacity() as u32);
if r == 0 {
info!("GetModuleFileNameW failed: {}", io::Error::last_os_error());
return None
}
let r = r as usize;
if r >= space.capacity() {
info!("our buffer was too small? {}",
io::Error::last_os_error());
return None
}
space.set_len(r);
let os = OsString::from_wide(&space);
Some(PathBuf::from(os))
}
}
}
// Parse args and run the compiler. This is the primary entry point for rustc.
// See comments on CompilerCalls below for details about the callbacks argument.
// The FileLoader provides a way to load files from sources other than the file system.
pub fn run_compiler<'a>(args: &[String],
callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
emitter_dest: Option<Box<dyn Write + Send>>)
-> (CompileResult, Option<Session>)
{
let matches = match handle_options(args) {
Some(matches) => matches,
None => return (Ok(()), None),
};
let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
driver::spawn_thread_pool(sopts, |sopts| {
run_compiler_with_pool(matches, sopts, cfg, callbacks, file_loader, emitter_dest)
})
}
fn run_compiler_with_pool<'a>(
matches: getopts::Matches,
sopts: config::Options,
cfg: ast::CrateConfig,
mut callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
emitter_dest: Option<Box<dyn Write + Send>>
) -> (CompileResult, Option<Session>) {
macro_rules! do_or_return {($expr: expr, $sess: expr) => {
match $expr {
Compilation::Stop => return (Ok(()), $sess),
Compilation::Continue => {}
}
}}
let descriptions = diagnostics_registry();
do_or_return!(callbacks.early_callback(&matches,
&sopts,
&cfg,
&descriptions,
sopts.error_format),
None);
let (odir, ofile) = make_output(&matches);
let (input, input_file_path, input_err) = match make_input(&matches.free) {
Some((input, input_file_path, input_err)) => {
let (input, input_file_path) = callbacks.some_input(input, input_file_path);
(input, input_file_path, input_err)
},
None => match callbacks.no_input(&matches, &sopts, &cfg, &odir, &ofile, &descriptions) {
Some((input, input_file_path)) => (input, input_file_path, None),
None => return (Ok(()), None),
},
};
let loader = file_loader.unwrap_or(box RealFileLoader);
let source_map = Lrc::new(SourceMap::with_file_loader(loader, sopts.file_path_mapping()));
let mut sess = session::build_session_with_source_map(
sopts, input_file_path.clone(), descriptions, source_map, emitter_dest,
);
if let Some(err) = input_err {
// Immediately stop compilation if there was an issue reading
// the input (for example if the input stream is not UTF-8).
sess.err(&err.to_string());
return (Err(CompileIncomplete::Stopped), Some(sess));
}
let codegen_backend = get_codegen_backend(&sess);
rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
let mut cfg = config::build_configuration(&sess, cfg);
target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
sess.parse_sess.config = cfg;
let result = {
let plugins = sess.opts.debugging_opts.extra_plugins.clone();
let cstore = CStore::new(codegen_backend.metadata_loader());
do_or_return!(callbacks.late_callback(&*codegen_backend,
&matches,
&sess,
&cstore,
&input,
&odir,
&ofile), Some(sess));
let _sess_abort_error = OnDrop(|| sess.diagnostic().print_error_count());
let control = callbacks.build_controller(&sess, &matches);
driver::compile_input(codegen_backend,
&sess,
&cstore,
&input_file_path,
&input,
&odir,
&ofile,
Some(plugins),
&control)
};
(result, Some(sess))
}
#[cfg(unix)]
pub fn set_sigpipe_handler() {
unsafe {
// Set the SIGPIPE signal handler, so that an EPIPE
// will cause rustc to terminate, as expected.
assert_ne!(libc::signal(libc::SIGPIPE, libc::SIG_DFL), libc::SIG_ERR);
}
}
#[cfg(windows)]
pub fn set_sigpipe_handler() {}
// Extract output directory and file from matches.
fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
(odir, ofile)
}
// Extract input (string or file and optional path) from matches.
fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
if free_matches.len() == 1 {
let ifile = &free_matches[0];
if ifile == "-" {
let mut src = String::new();
let err = if io::stdin().read_to_string(&mut src).is_err() {
Some(io::Error::new(io::ErrorKind::InvalidData,
"couldn't read from stdin, as it did not contain valid UTF-8"))
} else {
None
};
Some((Input::Str { name: FileName::anon_source_code(&src), input: src },
None, err))
} else {
Some((Input::File(PathBuf::from(ifile)),
Some(PathBuf::from(ifile)), None))
}
} else {
None
}
}
fn parse_pretty(sess: &Session,
matches: &getopts::Matches)
-> Option<(PpMode, Option<UserIdentifiedItem>)> {
let pretty = if sess.opts.debugging_opts.unstable_options {
matches.opt_default("pretty", "normal").map(|a| {
// stable pretty-print variants only
pretty::parse_pretty(sess, &a, false)
})
} else {
None
};
if pretty.is_none() {
sess.opts.debugging_opts.unpretty.as_ref().map(|a| {
// extended with unstable pretty-print variants
pretty::parse_pretty(sess, &a, true)
})
} else {
pretty
}
}
// Whether to stop or continue compilation.
#[derive(Copy, Clone, Debug, Eq, PartialEq)]
pub enum Compilation {
Stop,
Continue,
}
impl Compilation {
pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
match self {
Compilation::Stop => Compilation::Stop,
Compilation::Continue => next(),
}
}
}
/// A trait for customizing the compilation process. Offers a number of hooks for
/// executing custom code or customizing input.
pub trait CompilerCalls<'a> {
/// Hook for a callback early in the process of handling arguments. This will
/// be called straight after options have been parsed but before anything
/// else (e.g., selecting input and output).
fn early_callback(&mut self,
_: &getopts::Matches,
_: &config::Options,
_: &ast::CrateConfig,
_: &errors::registry::Registry,
_: ErrorOutputType)
-> Compilation {
Compilation::Continue
}
/// Hook for a callback late in the process of handling arguments. This will
/// be called just before actual compilation starts (and before build_controller
/// is called), after all arguments etc. have been completely handled.
fn late_callback(&mut self,
_: &dyn CodegenBackend,
_: &getopts::Matches,
_: &Session,
_: &CStore,
_: &Input,
_: &Option<PathBuf>,
_: &Option<PathBuf>)
-> Compilation {
Compilation::Continue
}
/// Called after we extract the input from the arguments. Gives the implementer
/// an opportunity to change the inputs or to add some custom input handling.
/// The default behaviour is to simply pass through the inputs.
fn some_input(&mut self,
input: Input,
input_path: Option<PathBuf>)
-> (Input, Option<PathBuf>) {
(input, input_path)
}
/// Called after we extract the input from the arguments if there is no valid
/// input. Gives the implementer an opportunity to supply alternate input (by
/// returning a Some value) or to add custom behaviour for this error such as
/// emitting error messages. Returning None will cause compilation to stop
/// at this point.
fn no_input(&mut self,
_: &getopts::Matches,
_: &config::Options,
_: &ast::CrateConfig,
_: &Option<PathBuf>,
_: &Option<PathBuf>,
_: &errors::registry::Registry)
-> Option<(Input, Option<PathBuf>)> {
None
}
// Create a CompilController struct for controlling the behaviour of
// compilation.
fn build_controller(
self: Box<Self>,
_: &Session,
_: &getopts::Matches
) -> CompileController<'a>;
}
/// CompilerCalls instance for a regular rustc build.
#[derive(Copy, Clone)]
pub struct RustcDefaultCalls;
// FIXME remove these and use winapi 0.3 instead
// Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs
#[cfg(unix)]
fn stdout_isatty() -> bool {
unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
}
#[cfg(windows)]
fn stdout_isatty() -> bool {
type DWORD = u32;
type BOOL = i32;
type HANDLE = *mut u8;
type LPDWORD = *mut u32;
const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
extern "system" {
fn GetStdHandle(which: DWORD) -> HANDLE;
fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: LPDWORD) -> BOOL;
}
unsafe {
let handle = GetStdHandle(STD_OUTPUT_HANDLE);
let mut out = 0;
GetConsoleMode(handle, &mut out) != 0
}
}
fn handle_explain(code: &str,
descriptions: &errors::registry::Registry,
output: ErrorOutputType) {
let normalised = if code.starts_with("E") {
code.to_string()
} else {
format!("E{0:0>4}", code)
};
match descriptions.find_description(&normalised) {
Some(ref description) => {
let mut is_in_code_block = false;
let mut text = String::new();
// Slice off the leading newline and print.
for line in description[1..].lines() {
let indent_level = line.find(|c: char| !c.is_whitespace())
.unwrap_or_else(|| line.len());
let dedented_line = &line[indent_level..];
if dedented_line.starts_with("```") {
is_in_code_block = !is_in_code_block;
text.push_str(&line[..(indent_level+3)]);
} else if is_in_code_block && dedented_line.starts_with("# ") {
continue;
} else {
text.push_str(line);
}
text.push('\n');
}
if stdout_isatty() {
show_content_with_pager(&text);
} else {
print!("{}", text);
}
}
None => {
early_error(output, &format!("no extended information for {}", code));
}
}
}
fn show_content_with_pager(content: &String) {
let pager_name = env::var_os("PAGER").unwrap_or_else(|| if cfg!(windows) {
OsString::from("more.com")
} else {
OsString::from("less")
});
let mut fallback_to_println = false;
match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
Ok(mut pager) => {
if let Some(pipe) = pager.stdin.as_mut() {
if pipe.write_all(content.as_bytes()).is_err() {
fallback_to_println = true;
}
}
if pager.wait().is_err() {
fallback_to_println = true;
}
}
Err(_) => {
fallback_to_println = true;
}
}
// If pager fails for whatever reason, we should still print the content
// to standard output
if fallback_to_println {
print!("{}", content);
}
}
impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
fn early_callback(&mut self,
matches: &getopts::Matches,
_: &config::Options,
_: &ast::CrateConfig,
descriptions: &errors::registry::Registry,
output: ErrorOutputType)
-> Compilation {
if let Some(ref code) = matches.opt_str("explain") {
handle_explain(code, descriptions, output);
return Compilation::Stop;
}
Compilation::Continue
}
fn no_input(&mut self,
matches: &getopts::Matches,
sopts: &config::Options,
cfg: &ast::CrateConfig,
odir: &Option<PathBuf>,
ofile: &Option<PathBuf>,
descriptions: &errors::registry::Registry)
-> Option<(Input, Option<PathBuf>)> {
match matches.free.len() {
0 => {
let mut sess = build_session(sopts.clone(),
None,
descriptions.clone());
if sopts.describe_lints {
let mut ls = lint::LintStore::new();
rustc_lint::register_builtins(&mut ls, Some(&sess));
describe_lints(&sess, &ls, false);
return None;
}
rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
let mut cfg = config::build_configuration(&sess, cfg.clone());
let codegen_backend = get_codegen_backend(&sess);
target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
sess.parse_sess.config = cfg;
let should_stop = RustcDefaultCalls::print_crate_info(
&*codegen_backend,
&sess,
None,
odir,
ofile
);
if should_stop == Compilation::Stop {
return None;
}
early_error(sopts.error_format, "no input filename given");
}
1 => panic!("make_input should have provided valid inputs"),
_ => early_error(sopts.error_format, "multiple input filenames provided"),
}
}
fn late_callback(&mut self,
codegen_backend: &dyn CodegenBackend,
matches: &getopts::Matches,
sess: &Session,
cstore: &CStore,
input: &Input,
odir: &Option<PathBuf>,
ofile: &Option<PathBuf>)
-> Compilation {
RustcDefaultCalls::print_crate_info(codegen_backend, sess, Some(input), odir, ofile)
.and_then(|| RustcDefaultCalls::list_metadata(sess, cstore, matches, input))
}
fn build_controller(self: Box<Self>,
sess: &Session,
matches: &getopts::Matches)
-> CompileController<'a> {
let mut control = CompileController::basic();
control.keep_ast = sess.opts.debugging_opts.keep_ast;
control.continue_parse_after_error = sess.opts.debugging_opts.continue_parse_after_error;
if let Some((ppm, opt_uii)) = parse_pretty(sess, matches) {
if ppm.needs_ast_map(&opt_uii) {
control.after_hir_lowering.stop = Compilation::Stop;
control.after_parse.callback = box move |state| {
state.krate = Some(pretty::fold_crate(state.session,
state.krate.take().unwrap(),
ppm));
};
control.after_hir_lowering.callback = box move |state| {
pretty::print_after_hir_lowering(state.session,
state.cstore.unwrap(),
state.hir_map.unwrap(),
state.analysis.unwrap(),
state.resolutions.unwrap(),
state.input,
&state.expanded_crate.take().unwrap(),
state.crate_name.unwrap(),
ppm,
state.arenas.unwrap(),
state.output_filenames.unwrap(),
opt_uii.clone(),
state.out_file);
};
} else {
control.after_parse.stop = Compilation::Stop;
control.after_parse.callback = box move |state| {
let krate = pretty::fold_crate(state.session, state.krate.take().unwrap(), ppm);
pretty::print_after_parsing(state.session,
state.input,
&krate,
ppm,
state.out_file);
};
}
return control;
}
if sess.opts.debugging_opts.parse_only ||
sess.opts.debugging_opts.show_span.is_some() ||
sess.opts.debugging_opts.ast_json_noexpand {
control.after_parse.stop = Compilation::Stop;
}
if sess.opts.debugging_opts.no_analysis ||
sess.opts.debugging_opts.ast_json {
control.after_hir_lowering.stop = Compilation::Stop;
}
if sess.opts.debugging_opts.save_analysis {
enable_save_analysis(&mut control);
}
if sess.print_fuel_crate.is_some() {
let old_callback = control.compilation_done.callback;
control.compilation_done.callback = box move |state| {
old_callback(state);
let sess = state.session;
eprintln!("Fuel used by {}: {}",
sess.print_fuel_crate.as_ref().unwrap(),
sess.print_fuel.get());
}
}
control
}
}
pub fn enable_save_analysis(control: &mut CompileController) {
control.keep_ast = true;
control.after_analysis.callback = box |state| {
time(state.session, "save analysis", || {
save::process_crate(state.tcx.unwrap(),
state.expanded_crate.unwrap(),
state.analysis.unwrap(),
state.crate_name.unwrap(),
state.input,
None,
DumpHandler::new(state.out_dir,
state.crate_name.unwrap()))
});
};
control.after_analysis.run_callback_on_error = true;
control.make_glob_map = resolve::MakeGlobMap::Yes;
}
impl RustcDefaultCalls {
pub fn list_metadata(sess: &Session,
cstore: &CStore,
matches: &getopts::Matches,
input: &Input)
-> Compilation {
let r = matches.opt_strs("Z");
if r.iter().any(|s| *s == "ls") {
match input {
&Input::File(ref ifile) => {
let path = &(*ifile);
let mut v = Vec::new();
locator::list_file_metadata(&sess.target.target,
path,
&*cstore.metadata_loader,
&mut v)
.unwrap();
println!("{}", String::from_utf8(v).unwrap());
}
&Input::Str { .. } => {
early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
}
}
return Compilation::Stop;
}
Compilation::Continue
}
fn print_crate_info(codegen_backend: &dyn CodegenBackend,
sess: &Session,
input: Option<&Input>,
odir: &Option<PathBuf>,
ofile: &Option<PathBuf>)
-> Compilation {
use rustc::session::config::PrintRequest::*;
// PrintRequest::NativeStaticLibs is special - printed during linking
// (empty iterator returns true)
if sess.opts.prints.iter().all(|&p| p == PrintRequest::NativeStaticLibs) {
return Compilation::Continue;
}
let attrs = match input {
None => None,
Some(input) => {
let result = parse_crate_attrs(sess, input);
match result {
Ok(attrs) => Some(attrs),
Err(mut parse_error) => {
parse_error.emit();
return Compilation::Stop;
}
}
}
};
for req in &sess.opts.prints {
match *req {
TargetList => {
let mut targets = rustc_target::spec::get_targets().collect::<Vec<String>>();
targets.sort();
println!("{}", targets.join("\n"));
},
Sysroot => println!("{}", sess.sysroot.display()),
TargetSpec => println!("{}", sess.target.target.to_json().pretty()),
FileNames | CrateName => {
let input = input.unwrap_or_else(||
early_error(ErrorOutputType::default(), "no input file provided"));
let attrs = attrs.as_ref().unwrap();
let t_outputs = driver::build_output_filenames(input, odir, ofile, attrs, sess);
let id = rustc_codegen_utils::link::find_crate_name(Some(sess), attrs, input);
if *req == PrintRequest::CrateName {
println!("{}", id);
continue;
}
let crate_types = driver::collect_crate_types(sess, attrs);
for &style in &crate_types {
let fname = rustc_codegen_utils::link::filename_for_input(
sess,
style,
&id,
&t_outputs
);
println!("{}", fname.file_name().unwrap().to_string_lossy());
}
}
Cfg => {
let allow_unstable_cfg = UnstableFeatures::from_environment()
.is_nightly_build();
let mut cfgs = sess.parse_sess.config.iter().filter_map(|&(name, ref value)| {
let gated_cfg = GatedCfg::gate(&ast::MetaItem {
ident: ast::Path::from_ident(ast::Ident::with_empty_ctxt(name)),
node: ast::MetaItemKind::Word,
span: DUMMY_SP,
});
// Note that crt-static is a specially recognized cfg
// directive that's printed out here as part of
// rust-lang/rust#37406, but in general the
// `target_feature` cfg is gated under
// rust-lang/rust#29717. For now this is just
// specifically allowing the crt-static cfg and that's
// it, this is intended to get into Cargo and then go
// through to build scripts.
let value = value.as_ref().map(|s| s.as_str());
let value = value.as_ref().map(|s| s.as_ref());
if name != "target_feature" || value != Some("crt-static") {
if !allow_unstable_cfg && gated_cfg.is_some() {
return None
}
}
if let Some(value) = value {
Some(format!("{}=\"{}\"", name, value))
} else {
Some(name.to_string())
}
}).collect::<Vec<String>>();
cfgs.sort();
for cfg in cfgs {
println!("{}", cfg);
}
}
RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
codegen_backend.print(*req, sess);
}
// Any output here interferes with Cargo's parsing of other printed output
PrintRequest::NativeStaticLibs => {}
}
}
return Compilation::Stop;
}
}
/// Returns a version string such as "0.12.0-dev".
fn release_str() -> Option<&'static str> {
option_env!("CFG_RELEASE")
}
/// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
fn commit_hash_str() -> Option<&'static str> {
option_env!("CFG_VER_HASH")
}
/// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
fn commit_date_str() -> Option<&'static str> {
option_env!("CFG_VER_DATE")
}
/// Prints version information
pub fn version(binary: &str, matches: &getopts::Matches) {
let verbose = matches.opt_present("verbose");
println!("{} {}", binary, option_env!("CFG_VERSION").unwrap_or("unknown version"));
if verbose {
fn unw(x: Option<&str>) -> &str {
x.unwrap_or("unknown")
}
println!("binary: {}", binary);
println!("commit-hash: {}", unw(commit_hash_str()));
println!("commit-date: {}", unw(commit_date_str()));
println!("host: {}", config::host_triple());
println!("release: {}", unw(release_str()));
get_codegen_sysroot("llvm")().print_version();
}
}
fn usage(verbose: bool, include_unstable_options: bool) {
let groups = if verbose {
config::rustc_optgroups()
} else {
config::rustc_short_optgroups()
};
let mut options = getopts::Options::new();
for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) {
(option.apply)(&mut options);
}
let message = "Usage: rustc [OPTIONS] INPUT";
let nightly_help = if nightly_options::is_nightly_build() {
"\n -Z help Print internal options for debugging rustc"
} else {
""
};
let verbose_help = if verbose {
""
} else {
"\n --help -v Print the full set of options rustc accepts"
};
println!("{}\nAdditional help:
-C help Print codegen options
-W help \
Print 'lint' options and default settings{}{}\n",
options.usage(message),
nightly_help,
verbose_help);
}
fn print_wall_help() {
println!("
The flag `-Wall` does not exist in `rustc`. Most useful lints are enabled by
default. Use `rustc -W help` to see all available lints. It's more common to put
warning settings in the crate root using `#![warn(LINT_NAME)]` instead of using
the command line flag directly.
");
}
fn describe_lints(sess: &Session, lint_store: &lint::LintStore, loaded_plugins: bool) {
println!("
Available lint options:
-W <foo> Warn about <foo>
-A <foo> \
Allow <foo>
-D <foo> Deny <foo>
-F <foo> Forbid <foo> \
(deny <foo> and all attempts to override)
");
fn sort_lints(sess: &Session, lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
// The sort doesn't case-fold but it's doubtful we care.
lints.sort_by_cached_key(|x: &&Lint| (x.default_level(sess), x.name));
lints
}
fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
-> Vec<(&'static str, Vec<lint::LintId>)> {
let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
lints.sort_by_key(|l| l.0);
lints
}
let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
.iter()
.cloned()
.partition(|&(_, p)| p);
let plugin = sort_lints(sess, plugin);
let builtin = sort_lints(sess, builtin);
let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
.iter()
.cloned()
.partition(|&(.., p)| p);
let plugin_groups = sort_lint_groups(plugin_groups);
let builtin_groups = sort_lint_groups(builtin_groups);
let max_name_len = plugin.iter()
.chain(&builtin)
.map(|&s| s.name.chars().count())
.max()
.unwrap_or(0);
let padded = |x: &str| {
let mut s = " ".repeat(max_name_len - x.chars().count());
s.push_str(x);
s
};
println!("Lint checks provided by rustc:\n");
println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
let print_lints = |lints: Vec<&Lint>| {
for lint in lints {
let name = lint.name_lower().replace("_", "-");
println!(" {} {:7.7} {}",
padded(&name),
lint.default_level.as_str(),
lint.desc);
}
println!("\n");
};
print_lints(builtin);
let max_name_len = max("warnings".len(),
plugin_groups.iter()
.chain(&builtin_groups)
.map(|&(s, _)| s.chars().count())
.max()
.unwrap_or(0));
let padded = |x: &str| {
let mut s = " ".repeat(max_name_len - x.chars().count());
s.push_str(x);
s
};
println!("Lint groups provided by rustc:\n");
println!(" {} {}", padded("name"), "sub-lints");
println!(" {} {}", padded("----"), "---------");
println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
let print_lint_groups = |lints: Vec<(&'static str, Vec<lint::LintId>)>| {
for (name, to) in lints {
let name = name.to_lowercase().replace("_", "-");
let desc = to.into_iter()
.map(|x| x.to_string().replace("_", "-"))
.collect::<Vec<String>>()
.join(", ");
println!(" {} {}", padded(&name), desc);
}
println!("\n");
};
print_lint_groups(builtin_groups);
match (loaded_plugins, plugin.len(), plugin_groups.len()) {
(false, 0, _) | (false, _, 0) => {
println!("Compiler plugins can provide additional lints and lint groups. To see a \
listing of these, re-run `rustc -W help` with a crate filename.");
}
(false, ..) => panic!("didn't load lint plugins but got them anyway!"),
(true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
(true, l, g) => {
if l > 0 {
println!("Lint checks provided by plugins loaded by this crate:\n");
print_lints(plugin);
}
if g > 0 {
println!("Lint groups provided by plugins loaded by this crate:\n");
print_lint_groups(plugin_groups);
}
}
}
}
fn describe_debug_flags() {
println!("\nAvailable debug options:\n");
print_flag_list("-Z", config::DB_OPTIONS);
}
fn describe_codegen_flags() {
println!("\nAvailable codegen options:\n");
print_flag_list("-C", config::CG_OPTIONS);
}
fn print_flag_list<T>(cmdline_opt: &str,
flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
let max_len = flag_list.iter()
.map(|&(name, _, opt_type_desc, _)| {
let extra_len = match opt_type_desc {
Some(..) => 4,
None => 0,
};
name.chars().count() + extra_len
})
.max()
.unwrap_or(0);
for &(name, _, opt_type_desc, desc) in flag_list {
let (width, extra) = match opt_type_desc {
Some(..) => (max_len - 4, "=val"),
None => (max_len, ""),
};
println!(" {} {:>width$}{} -- {}",
cmdline_opt,
name.replace("_", "-"),
extra,
desc,
width = width);
}
}
/// Process command line options. Emits messages as appropriate. If compilation
/// should continue, returns a getopts::Matches object parsed from args,
/// otherwise returns None.
///
/// The compiler's handling of options is a little complicated as it ties into
/// our stability story, and it's even *more* complicated by historical
/// accidents. The current intention of each compiler option is to have one of
/// three modes:
///
/// 1. An option is stable and can be used everywhere.
/// 2. An option is unstable, but was historically allowed on the stable
/// channel.
/// 3. An option is unstable, and can only be used on nightly.
///
/// Like unstable library and language features, however, unstable options have
/// always required a form of "opt in" to indicate that you're using them. This
/// provides the easy ability to scan a code base to check to see if anything
/// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag.
///
/// All options behind `-Z` are considered unstable by default. Other top-level
/// options can also be considered unstable, and they were unlocked through the
/// `-Z unstable-options` flag. Note that `-Z` remains to be the root of
/// instability in both cases, though.
///
/// So with all that in mind, the comments below have some more detail about the
/// contortions done here to get things to work out correctly.
pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
// Throw away the first argument, the name of the binary
let args = &args[1..];
if args.is_empty() {
// user did not write `-v` nor `-Z unstable-options`, so do not
// include that extra information.
usage(false, false);
return None;
}
// Parse with *all* options defined in the compiler, we don't worry about
// option stability here we just want to parse as much as possible.
let mut options = getopts::Options::new();
for option in config::rustc_optgroups() {
(option.apply)(&mut options);
}
let matches = options.parse(args).unwrap_or_else(|f|
early_error(ErrorOutputType::default(), &f.to_string()));
// For all options we just parsed, we check a few aspects:
//
// * If the option is stable, we're all good
// * If the option wasn't passed, we're all good
// * If `-Z unstable-options` wasn't passed (and we're not a -Z option
// ourselves), then we require the `-Z unstable-options` flag to unlock
// this option that was passed.
// * If we're a nightly compiler, then unstable options are now unlocked, so
// we're good to go.
// * Otherwise, if we're a truly unstable option then we generate an error
// (unstable option being used on stable)
// * If we're a historically stable-but-should-be-unstable option then we
// emit a warning that we're going to turn this into an error soon.
nightly_options::check_nightly_options(&matches, &config::rustc_optgroups());
if matches.opt_present("h") || matches.opt_present("help") {
// Only show unstable options in --help if we *really* accept unstable
// options, which catches the case where we got `-Z unstable-options` on
// the stable channel of Rust which was accidentally allowed
// historically.
usage(matches.opt_present("verbose"),
nightly_options::is_unstable_enabled(&matches));
return None;
}
// Handle the special case of -Wall.
let wall = matches.opt_strs("W");
if wall.iter().any(|x| *x == "all") {
print_wall_help();
return None;
}
// Don't handle -W help here, because we might first load plugins.
let r = matches.opt_strs("Z");
if r.iter().any(|x| *x == "help") {
describe_debug_flags();
return None;
}
let cg_flags = matches.opt_strs("C");
if cg_flags.iter().any(|x| *x == "help") {
describe_codegen_flags();
return None;
}
if cg_flags.iter().any(|x| *x == "no-stack-check") {
early_warn(ErrorOutputType::default(),
"the --no-stack-check flag is deprecated and does nothing");
}
if cg_flags.iter().any(|x| *x == "passes=list") {
get_codegen_sysroot("llvm")().print_passes();
return None;
}
if matches.opt_present("version") {
version("rustc", &matches);
return None;
}
Some(matches)
}
fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
match *input {
Input::File(ref ifile) => {
parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess)
}
Input::Str { ref name, ref input } => {
parse::parse_crate_attrs_from_source_str(name.clone(),
input.clone(),
&sess.parse_sess)
}
}
}
// Temporarily have stack size set to 32MB to deal with various crates with long method
// chains or deep syntax trees.
// FIXME(oli-obk): get https://github.com/rust-lang/rust/pull/55617 the finish line
const STACK_SIZE: usize = 32 * 1024 * 1024; // 32MB
/// Runs `f` in a suitable thread for running `rustc`; returns a `Result` with either the return
/// value of `f` or -- if a panic occurs -- the panic value.
///
/// This version applies the given name to the thread. This is used by rustdoc to ensure consistent
/// doctest output across platforms and executions.
pub fn in_named_rustc_thread<F, R>(name: String, f: F) -> Result<R, Box<dyn Any + Send>>
where F: FnOnce() -> R + Send + 'static,
R: Send + 'static,
{
#[cfg(all(unix, not(target_os = "haiku")))]
let spawn_thread = unsafe {
// Fetch the current resource limits
let mut rlim = libc::rlimit {
rlim_cur: 0,
rlim_max: 0,
};
if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
let err = io::Error::last_os_error();
error!("in_rustc_thread: error calling getrlimit: {}", err);
true
} else if rlim.rlim_max < STACK_SIZE as libc::rlim_t {
true
} else if rlim.rlim_cur < STACK_SIZE as libc::rlim_t {
std::rt::deinit_stack_guard();
rlim.rlim_cur = STACK_SIZE as libc::rlim_t;
if libc::setrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
let err = io::Error::last_os_error();
error!("in_rustc_thread: error calling setrlimit: {}", err);
std::rt::update_stack_guard();
true
} else {
std::rt::update_stack_guard();
false
}
} else {
false
}
};
// We set the stack size at link time. See src/rustc/rustc.rs.
#[cfg(windows)]
let spawn_thread = false;
#[cfg(target_os = "haiku")]
let spawn_thread = unsafe {
// Haiku does not have setrlimit implemented for the stack size.
// By default it does have the 16 MB stack limit, but we check this in
// case the minimum STACK_SIZE changes or Haiku's defaults change.
let mut rlim = libc::rlimit {
rlim_cur: 0,
rlim_max: 0,
};
if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
let err = io::Error::last_os_error();
error!("in_rustc_thread: error calling getrlimit: {}", err);
true
} else if rlim.rlim_cur >= STACK_SIZE {
false
} else {
true
}
};
#[cfg(not(any(windows, unix)))]
let spawn_thread = true;
// The or condition is added from backward compatibility.
if spawn_thread || env::var_os("RUST_MIN_STACK").is_some() {
let mut cfg = thread::Builder::new().name(name);
// FIXME: Hacks on hacks. If the env is trying to override the stack size
// then *don't* set it explicitly.
if env::var_os("RUST_MIN_STACK").is_none() {
cfg = cfg.stack_size(STACK_SIZE);
}
let thread = cfg.spawn(f);
thread.unwrap().join()
} else {
let f = panic::AssertUnwindSafe(f);
panic::catch_unwind(f)
}
}
/// Runs `f` in a suitable thread for running `rustc`; returns a
/// `Result` with either the return value of `f` or -- if a panic
/// occurs -- the panic value.
pub fn in_rustc_thread<F, R>(f: F) -> Result<R, Box<dyn Any + Send>>
where F: FnOnce() -> R + Send + 'static,
R: Send + 'static,
{
in_named_rustc_thread("rustc".to_string(), f)
}
/// Get a list of extra command-line flags provided by the user, as strings.
///
/// This function is used during ICEs to show more information useful for
/// debugging, since some ICEs only happens with non-default compiler flags
/// (and the users don't always report them).
fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
let args = env::args_os().map(|arg| arg.to_string_lossy().to_string()).collect::<Vec<_>>();
// Avoid printing help because of empty args. This can suggest the compiler
// itself is not the program root (consider RLS).
if args.len() < 2 {
return None;
}
let matches = if let Some(matches) = handle_options(&args) {
matches
} else {
return None;
};
let mut result = Vec::new();
let mut excluded_cargo_defaults = false;
for flag in ICE_REPORT_COMPILER_FLAGS {
let prefix = if flag.len() == 1 { "-" } else { "--" };
for content in &matches.opt_strs(flag) {
// Split always returns the first element
let name = if let Some(first) = content.split('=').next() {
first
} else {
&content
};
let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
name
} else {
content
};
if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
result.push(format!("{}{} {}", prefix, flag, content));
} else {
excluded_cargo_defaults = true;
}
}
}
if !result.is_empty() {
Some((result, excluded_cargo_defaults))
} else {
None
}
}
#[derive(Debug)]
pub struct CompilationFailure;
impl Error for CompilationFailure {}
impl Display for CompilationFailure {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "compilation had errors")
}
}
/// Run a procedure which will detect panics in the compiler and print nicer
/// error messages rather than just failing the test.
///
/// The diagnostic emitter yielded to the procedure should be used for reporting
/// errors of the compiler.
pub fn monitor<F: FnOnce() + Send + 'static>(f: F) -> Result<(), CompilationFailure> {
in_rustc_thread(move || {
f()
}).map_err(|value| {
if value.is::<errors::FatalErrorMarker>() {
CompilationFailure
} else {
// Thread panicked without emitting a fatal diagnostic
eprintln!("");
let emitter =
Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
None,
false,
false));
let handler = errors::Handler::with_emitter(true, false, emitter);
// a .span_bug or .bug call has already printed what
// it wants to print.
if !value.is::<errors::ExplicitBug>() {
handler.emit(&MultiSpan::new(),
"unexpected panic",
errors::Level::Bug);
}
let mut xs: Vec<Cow<'static, str>> = vec![
"the compiler unexpectedly panicked. this is a bug.".into(),
format!("we would appreciate a bug report: {}", BUG_REPORT_URL).into(),
format!("rustc {} running on {}",
option_env!("CFG_VERSION").unwrap_or("unknown_version"),
config::host_triple()).into(),
];
if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
xs.push(format!("compiler flags: {}", flags.join(" ")).into());
if excluded_cargo_defaults {
xs.push("some of the compiler flags provided by cargo are hidden".into());
}
}
for note in &xs {
handler.emit(&MultiSpan::new(),
note,
errors::Level::Note);
}
panic::resume_unwind(Box::new(errors::FatalErrorMarker));
}
})
}
pub fn diagnostics_registry() -> errors::registry::Registry {
use errors::registry::Registry;
let mut all_errors = Vec::new();
all_errors.extend_from_slice(&rustc::DIAGNOSTICS);
all_errors.extend_from_slice(&rustc_typeck::DIAGNOSTICS);
all_errors.extend_from_slice(&rustc_resolve::DIAGNOSTICS);
all_errors.extend_from_slice(&rustc_privacy::DIAGNOSTICS);
// FIXME: need to figure out a way to get these back in here
// all_errors.extend_from_slice(get_codegen_backend(sess).diagnostics());
all_errors.extend_from_slice(&rustc_metadata::DIAGNOSTICS);
all_errors.extend_from_slice(&rustc_passes::DIAGNOSTICS);
all_errors.extend_from_slice(&rustc_plugin::DIAGNOSTICS);
all_errors.extend_from_slice(&rustc_mir::DIAGNOSTICS);
all_errors.extend_from_slice(&syntax::DIAGNOSTICS);
Registry::new(&all_errors)
}
/// This allows tools to enable rust logging without having to magically match rustc's
/// log crate version
pub fn init_rustc_env_logger() {
env_logger::init();
}
pub fn main() {
init_rustc_env_logger();
let result = run(|| {
let args = env::args_os().enumerate()
.map(|(i, arg)| arg.into_string().unwrap_or_else(|arg| {
early_error(ErrorOutputType::default(),
&format!("Argument {} is not valid Unicode: {:?}", i, arg))
}))
.collect::<Vec<_>>();
run_compiler(&args,
Box::new(RustcDefaultCalls),
None,
None)
});
process::exit(result as i32);
}