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//! Writing of the rustc metadata for dylibs
use object::write::{Object, StandardSegment, Symbol, SymbolSection};
use object::{SectionKind, SymbolFlags, SymbolKind, SymbolScope};
use rustc_metadata::EncodedMetadata;
use rustc_middle::ty::TyCtxt;
// Adapted from https://github.com/rust-lang/rust/blob/da573206f87b5510de4b0ee1a9c044127e409bd3/src/librustc_codegen_llvm/base.rs#L47-L112
pub(crate) fn new_metadata_object(
tcx: TyCtxt<'_>,
cgu_name: &str,
metadata: &EncodedMetadata,
) -> Vec<u8> {
use snap::write::FrameEncoder;
use std::io::Write;
let mut compressed = rustc_metadata::METADATA_HEADER.to_vec();
FrameEncoder::new(&mut compressed).write_all(metadata.raw_data()).unwrap();
let triple = crate::target_triple(tcx.sess);
let binary_format = match triple.binary_format {
target_lexicon::BinaryFormat::Elf => object::BinaryFormat::Elf,
target_lexicon::BinaryFormat::Coff => object::BinaryFormat::Coff,
target_lexicon::BinaryFormat::Macho => object::BinaryFormat::MachO,
binary_format => tcx.sess.fatal(&format!("binary format {} is unsupported", binary_format)),
};
let architecture = match triple.architecture {
target_lexicon::Architecture::Aarch64(_) => object::Architecture::Aarch64,
target_lexicon::Architecture::Arm(_) => object::Architecture::Arm,
target_lexicon::Architecture::Avr => object::Architecture::Avr,
target_lexicon::Architecture::Hexagon => object::Architecture::Hexagon,
target_lexicon::Architecture::Mips32(_) => object::Architecture::Mips,
target_lexicon::Architecture::Mips64(_) => object::Architecture::Mips64,
target_lexicon::Architecture::Msp430 => object::Architecture::Msp430,
target_lexicon::Architecture::Powerpc => object::Architecture::PowerPc,
target_lexicon::Architecture::Powerpc64 => object::Architecture::PowerPc64,
target_lexicon::Architecture::Powerpc64le => todo!(),
target_lexicon::Architecture::Riscv32(_) => object::Architecture::Riscv32,
target_lexicon::Architecture::Riscv64(_) => object::Architecture::Riscv64,
target_lexicon::Architecture::S390x => object::Architecture::S390x,
target_lexicon::Architecture::Sparc64 => object::Architecture::Sparc64,
target_lexicon::Architecture::Sparcv9 => object::Architecture::Sparc64,
target_lexicon::Architecture::X86_32(_) => object::Architecture::I386,
target_lexicon::Architecture::X86_64 => object::Architecture::X86_64,
architecture => {
tcx.sess.fatal(&format!("target architecture {:?} is unsupported", architecture,))
}
};
let endian = match triple.endianness().unwrap() {
target_lexicon::Endianness::Little => object::Endianness::Little,
target_lexicon::Endianness::Big => object::Endianness::Big,
};
let mut object = Object::new(binary_format, architecture, endian);
object.add_file_symbol(cgu_name.as_bytes().to_vec());
let segment = object.segment_name(StandardSegment::Data).to_vec();
let section_id = object.add_section(segment, b".rustc".to_vec(), SectionKind::Data);
let offset = object.append_section_data(section_id, &compressed, 1);
// For MachO and probably PE this is necessary to prevent the linker from throwing away the
// .rustc section. For ELF this isn't necessary, but it also doesn't harm.
object.add_symbol(Symbol {
name: rustc_middle::middle::exported_symbols::metadata_symbol_name(tcx).into_bytes(),
value: offset,
size: compressed.len() as u64,
kind: SymbolKind::Data,
scope: SymbolScope::Dynamic,
weak: false,
section: SymbolSection::Section(section_id),
flags: SymbolFlags::None,
});
object.write().unwrap()
}
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