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use std::env;
use std::ffi::{CStr, CString, OsString};
use std::io;
use std::mem;
use std::path::{Path, PathBuf};
use std::ptr;
use std::str;
use crate::common;
use crate::llvm::archive_ro::{ArchiveRO, Child};
use crate::llvm::{self, ArchiveKind, LLVMMachineType, LLVMRustCOFFShortExport};
use rustc_codegen_ssa::back::archive::{ArchiveBuilder, ArchiveBuilderBuilder};
use rustc_session::cstore::DllImport;
use rustc_session::Session;
#[must_use = "must call build() to finish building the archive"]
pub 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,
}
}
fn llvm_machine_type(cpu: &str) -> LLVMMachineType {
match cpu {
"x86_64" => LLVMMachineType::AMD64,
"x86" => LLVMMachineType::I386,
"aarch64" => LLVMMachineType::ARM64,
"arm" => LLVMMachineType::ARM,
_ => panic!("unsupported cpu type {}", cpu),
}
}
impl<'a> ArchiveBuilder<'a> for LlvmArchiveBuilder<'a> {
fn add_archive(
&mut self,
archive: &Path,
skip: Box<dyn FnMut(&str) -> bool + 'static>,
) -> io::Result<()> {
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.to_path_buf(),
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(e) => self.sess.fatal(&format!("failed to build archive: {}", e)),
}
}
}
pub struct LlvmArchiveBuilderBuilder;
impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
fn new_archive_builder<'a>(&self, sess: &'a Session) -> Box<dyn ArchiveBuilder<'a> + 'a> {
Box::new(LlvmArchiveBuilder { sess, additions: Vec::new() })
}
fn create_dll_import_lib(
&self,
sess: &Session,
lib_name: &str,
dll_imports: &[DllImport],
tmpdir: &Path,
) -> PathBuf {
let output_path = {
let mut output_path: PathBuf = tmpdir.to_path_buf();
output_path.push(format!("{}_imports", lib_name));
output_path.with_extension("lib")
};
let target = &sess.target;
let mingw_gnu_toolchain = common::is_mingw_gnu_toolchain(target);
let import_name_and_ordinal_vector: Vec<(String, Option<u16>)> = dll_imports
.iter()
.map(|import: &DllImport| {
if sess.target.arch == "x86" {
(
common::i686_decorated_name(import, mingw_gnu_toolchain, false),
import.ordinal(),
)
} else {
(import.name.to_string(), import.ordinal())
}
})
.collect();
if mingw_gnu_toolchain {
let def_file_path = tmpdir.join(format!("{}_imports", lib_name)).with_extension("def");
let def_file_content = format!(
"EXPORTS\n{}",
import_name_and_ordinal_vector
.into_iter()
.map(|(name, ordinal)| {
match ordinal {
Some(n) => format!("{} @{} NONAME", name, n),
None => name,
}
})
.collect::<Vec<String>>()
.join("\n")
);
match std::fs::write(&def_file_path, def_file_content) {
Ok(_) => {}
Err(e) => {
sess.fatal(&format!("Error writing .DEF file: {}", e));
}
};
let dlltool = find_binutils_dlltool(sess);
let result = std::process::Command::new(dlltool)
.args([
"-d",
def_file_path.to_str().unwrap(),
"-D",
lib_name,
"-l",
output_path.to_str().unwrap(),
"--no-leading-underscore",
])
.output();
match result {
Err(e) => {
sess.fatal(&format!("Error calling dlltool: {}", e));
}
Ok(output) if !output.status.success() => sess.fatal(&format!(
"Dlltool could not create import library: {}\n{}",
String::from_utf8_lossy(&output.stdout),
String::from_utf8_lossy(&output.stderr)
)),
_ => {}
}
} else {
let dll_name_z = CString::new(lib_name).unwrap();
let output_path_z = rustc_fs_util::path_to_c_string(&output_path);
trace!("invoking LLVMRustWriteImportLibrary");
trace!(" dll_name {:#?}", dll_name_z);
trace!(" output_path {}", output_path.display());
trace!(
" import names: {}",
dll_imports
.iter()
.map(|import| import.name.to_string())
.collect::<Vec<_>>()
.join(", "),
);
let cstring_import_name_and_ordinal_vector: Vec<(CString, Option<u16>)> =
import_name_and_ordinal_vector
.into_iter()
.map(|(name, ordinal)| (CString::new(name).unwrap(), ordinal))
.collect();
let ffi_exports: Vec<LLVMRustCOFFShortExport> = cstring_import_name_and_ordinal_vector
.iter()
.map(|(name_z, ordinal)| LLVMRustCOFFShortExport::new(name_z.as_ptr(), *ordinal))
.collect();
let result = unsafe {
crate::llvm::LLVMRustWriteImportLibrary(
dll_name_z.as_ptr(),
output_path_z.as_ptr(),
ffi_exports.as_ptr(),
ffi_exports.len(),
llvm_machine_type(&sess.target.arch) as u16,
!sess.target.is_like_msvc,
)
};
if result == crate::llvm::LLVMRustResult::Failure {
sess.fatal(&format!(
"Error creating import library for {}: {}",
lib_name,
llvm::last_error().unwrap_or("unknown LLVM error".to_string())
));
}
};
output_path
}
}
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.fatal(&format!("Don't know how to build archive of type: {}", 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.clone())?;
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,
);
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))
}
fn find_binutils_dlltool(sess: &Session) -> OsString {
assert!(sess.target.options.is_like_windows && !sess.target.options.is_like_msvc);
if let Some(dlltool_path) = &sess.opts.unstable_opts.dlltool {
return dlltool_path.clone().into_os_string();
}
let mut tool_name: OsString = if sess.host.arch != sess.target.arch {
if sess.target.arch == "x86" {
"i686-w64-mingw32-dlltool"
} else {
"x86_64-w64-mingw32-dlltool"
}
} else {
"dlltool"
}
.into();
if sess.host.options.is_like_windows {
tool_name.push(".exe");
}
for dir in env::split_paths(&env::var_os("PATH").unwrap_or_default()) {
let full_path = dir.join(&tool_name);
if full_path.is_file() {
return full_path.into_os_string();
}
}
tool_name
}