use std::ffi::{CStr, CString, c_char, c_void};
use std::path::{Path, PathBuf};
use std::{io, mem, ptr, str};
use rustc_codegen_ssa::back::archive::{
ArArchiveBuilder, ArchiveBuildFailure, ArchiveBuilder, ArchiveBuilderBuilder,
DEFAULT_OBJECT_READER, ObjectReader, UnknownArchiveKind, try_extract_macho_fat_archive,
};
use rustc_session::Session;
use crate::llvm::archive_ro::{ArchiveRO, Child};
use crate::llvm::{self, ArchiveKind};
#[must_use = "must call build() to finish building the archive"]
pub(crate) struct LlvmArchiveBuilder<'a> {
sess: &'a Session,
additions: Vec<Addition>,
}
enum Addition {
File { path: PathBuf, name_in_archive: String },
Archive { path: PathBuf, archive: ArchiveRO, skip: Box<dyn FnMut(&str) -> bool> },
}
impl Addition {
fn path(&self) -> &Path {
match self {
Addition::File { path, .. } | Addition::Archive { path, .. } => path,
}
}
}
fn is_relevant_child(c: &Child<'_>) -> bool {
match c.name() {
Some(name) => !name.contains("SYMDEF"),
None => false,
}
}
impl<'a> ArchiveBuilder for LlvmArchiveBuilder<'a> {
fn add_archive(
&mut self,
archive: &Path,
skip: Box<dyn FnMut(&str) -> bool + 'static>,
) -> io::Result<()> {
let mut archive = archive.to_path_buf();
if self.sess.target.llvm_target.contains("-apple-macosx") {
if let Some(new_archive) = try_extract_macho_fat_archive(self.sess, &archive)? {
archive = new_archive
}
}
let archive_ro = match ArchiveRO::open(&archive) {
Ok(ar) => ar,
Err(e) => return Err(io::Error::new(io::ErrorKind::Other, e)),
};
if self.additions.iter().any(|ar| ar.path() == archive) {
return Ok(());
}
self.additions.push(Addition::Archive {
path: archive,
archive: archive_ro,
skip: Box::new(skip),
});
Ok(())
}
fn add_file(&mut self, file: &Path) {
let name = file.file_name().unwrap().to_str().unwrap();
self.additions
.push(Addition::File { path: file.to_path_buf(), name_in_archive: name.to_owned() });
}
fn build(mut self: Box<Self>, output: &Path) -> bool {
match self.build_with_llvm(output) {
Ok(any_members) => any_members,
Err(error) => {
self.sess.dcx().emit_fatal(ArchiveBuildFailure { path: output.to_owned(), error })
}
}
}
}
pub(crate) struct LlvmArchiveBuilderBuilder;
impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
fn new_archive_builder<'a>(&self, sess: &'a Session) -> Box<dyn ArchiveBuilder + 'a> {
if false {
Box::new(LlvmArchiveBuilder { sess, additions: Vec::new() })
} else {
Box::new(ArArchiveBuilder::new(sess, &LLVM_OBJECT_READER))
}
}
}
static LLVM_OBJECT_READER: ObjectReader = ObjectReader {
get_symbols: get_llvm_object_symbols,
is_64_bit_object_file: llvm_is_64_bit_object_file,
is_ec_object_file: llvm_is_ec_object_file,
get_xcoff_member_alignment: DEFAULT_OBJECT_READER.get_xcoff_member_alignment,
};
#[deny(unsafe_op_in_unsafe_fn)]
fn get_llvm_object_symbols(
buf: &[u8],
f: &mut dyn FnMut(&[u8]) -> io::Result<()>,
) -> io::Result<bool> {
let mut state = Box::new(f);
let err = unsafe {
llvm::LLVMRustGetSymbols(
buf.as_ptr(),
buf.len(),
(&raw mut *state) as *mut c_void,
callback,
error_callback,
)
};
if err.is_null() {
return Ok(true);
} else {
return Err(unsafe { *Box::from_raw(err as *mut io::Error) });
}
unsafe extern "C" fn callback(state: *mut c_void, symbol_name: *const c_char) -> *mut c_void {
let f = unsafe { &mut *(state as *mut &mut dyn FnMut(&[u8]) -> io::Result<()>) };
match f(unsafe { CStr::from_ptr(symbol_name) }.to_bytes()) {
Ok(()) => std::ptr::null_mut(),
Err(err) => Box::into_raw(Box::new(err)) as *mut c_void,
}
}
unsafe extern "C" fn error_callback(error: *const c_char) -> *mut c_void {
let error = unsafe { CStr::from_ptr(error) };
Box::into_raw(Box::new(io::Error::new(
io::ErrorKind::Other,
format!("LLVM error: {}", error.to_string_lossy()),
))) as *mut c_void
}
}
fn llvm_is_64_bit_object_file(buf: &[u8]) -> bool {
unsafe { llvm::LLVMRustIs64BitSymbolicFile(buf.as_ptr(), buf.len()) }
}
fn llvm_is_ec_object_file(buf: &[u8]) -> bool {
unsafe { llvm::LLVMRustIsECObject(buf.as_ptr(), buf.len()) }
}
impl<'a> LlvmArchiveBuilder<'a> {
fn build_with_llvm(&mut self, output: &Path) -> io::Result<bool> {
let kind = &*self.sess.target.archive_format;
let kind = kind
.parse::<ArchiveKind>()
.map_err(|_| kind)
.unwrap_or_else(|kind| self.sess.dcx().emit_fatal(UnknownArchiveKind { kind }));
let mut additions = mem::take(&mut self.additions);
let mut strings = Vec::new();
let mut members = Vec::new();
let dst = CString::new(output.to_str().unwrap())?;
unsafe {
for addition in &mut additions {
match addition {
Addition::File { path, name_in_archive } => {
let path = CString::new(path.to_str().unwrap())?;
let name = CString::new(name_in_archive.as_bytes())?;
members.push(llvm::LLVMRustArchiveMemberNew(
path.as_ptr(),
name.as_ptr(),
None,
));
strings.push(path);
strings.push(name);
}
Addition::Archive { archive, skip, .. } => {
for child in archive.iter() {
let child = child.map_err(string_to_io_error)?;
if !is_relevant_child(&child) {
continue;
}
let child_name = child.name().unwrap();
if skip(child_name) {
continue;
}
let child_name =
Path::new(child_name).file_name().unwrap().to_str().unwrap();
let name = CString::new(child_name)?;
let m = llvm::LLVMRustArchiveMemberNew(
ptr::null(),
name.as_ptr(),
Some(child.raw),
);
members.push(m);
strings.push(name);
}
}
}
}
let r = llvm::LLVMRustWriteArchive(
dst.as_ptr(),
members.len() as libc::size_t,
members.as_ptr() as *const &_,
true,
kind,
self.sess.target.arch == "arm64ec",
);
let ret = if r.into_result().is_err() {
let err = llvm::LLVMRustGetLastError();
let msg = if err.is_null() {
"failed to write archive".into()
} else {
String::from_utf8_lossy(CStr::from_ptr(err).to_bytes())
};
Err(io::Error::new(io::ErrorKind::Other, msg))
} else {
Ok(!members.is_empty())
};
for member in members {
llvm::LLVMRustArchiveMemberFree(member);
}
ret
}
}
}
fn string_to_io_error(s: String) -> io::Error {
io::Error::new(io::ErrorKind::Other, format!("bad archive: {s}"))
}