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|
use std::collections::HashMap;
use std::{env, fs, process};
use object::{
write, Object, ObjectComdat, ObjectSection, ObjectSymbol, RelocationTarget, SectionKind,
SymbolFlags, SymbolKind, SymbolSection,
};
fn main() {
let mut args = env::args();
if args.len() != 3 {
eprintln!("Usage: {} <infile> <outfile>", args.next().unwrap());
process::exit(1);
}
args.next();
let in_file_path = args.next().unwrap();
let out_file_path = args.next().unwrap();
let in_file = match fs::File::open(&in_file_path) {
Ok(file) => file,
Err(err) => {
eprintln!("Failed to open file '{}': {}", in_file_path, err,);
process::exit(1);
}
};
let in_file = match unsafe { memmap2::Mmap::map(&in_file) } {
Ok(mmap) => mmap,
Err(err) => {
eprintln!("Failed to map file '{}': {}", in_file_path, err,);
process::exit(1);
}
};
let in_object = match object::File::parse(&*in_file) {
Ok(object) => object,
Err(err) => {
eprintln!("Failed to parse file '{}': {}", in_file_path, err);
process::exit(1);
}
};
let mut out_object = write::Object::new(
in_object.format(),
in_object.architecture(),
in_object.endianness(),
);
out_object.mangling = write::Mangling::None;
out_object.flags = in_object.flags();
let mut out_sections = HashMap::new();
for in_section in in_object.sections() {
if in_section.kind() == SectionKind::Metadata {
continue;
}
let section_id = out_object.add_section(
in_section
.segment_name()
.unwrap()
.unwrap_or("")
.as_bytes()
.to_vec(),
in_section.name().unwrap().as_bytes().to_vec(),
in_section.kind(),
);
let out_section = out_object.section_mut(section_id);
if out_section.is_bss() {
out_section.append_bss(in_section.size(), in_section.align());
} else {
out_section.set_data(in_section.data().unwrap().into(), in_section.align());
}
out_section.flags = in_section.flags();
out_sections.insert(in_section.index(), section_id);
}
let mut out_symbols = HashMap::new();
for in_symbol in in_object.symbols() {
if in_symbol.kind() == SymbolKind::Null {
continue;
}
let (section, value) = match in_symbol.section() {
SymbolSection::None => (write::SymbolSection::None, in_symbol.address()),
SymbolSection::Undefined => (write::SymbolSection::Undefined, in_symbol.address()),
SymbolSection::Absolute => (write::SymbolSection::Absolute, in_symbol.address()),
SymbolSection::Common => (write::SymbolSection::Common, in_symbol.address()),
SymbolSection::Section(index) => {
if let Some(out_section) = out_sections.get(&index) {
(
write::SymbolSection::Section(*out_section),
in_symbol.address() - in_object.section_by_index(index).unwrap().address(),
)
} else {
// Ignore symbols for sections that we have skipped.
assert_eq!(in_symbol.kind(), SymbolKind::Section);
continue;
}
}
_ => panic!("unknown symbol section for {:?}", in_symbol),
};
let flags = match in_symbol.flags() {
SymbolFlags::None => SymbolFlags::None,
SymbolFlags::Elf { st_info, st_other } => SymbolFlags::Elf { st_info, st_other },
SymbolFlags::MachO { n_desc } => SymbolFlags::MachO { n_desc },
SymbolFlags::CoffSection {
selection,
associative_section,
} => {
let associative_section =
associative_section.map(|index| *out_sections.get(&index).unwrap());
SymbolFlags::CoffSection {
selection,
associative_section,
}
}
_ => panic!("unknown symbol flags for {:?}", in_symbol),
};
let out_symbol = write::Symbol {
name: in_symbol.name().unwrap_or("").as_bytes().to_vec(),
value,
size: in_symbol.size(),
kind: in_symbol.kind(),
scope: in_symbol.scope(),
weak: in_symbol.is_weak(),
section,
flags,
};
let symbol_id = out_object.add_symbol(out_symbol);
out_symbols.insert(in_symbol.index(), symbol_id);
}
for in_section in in_object.sections() {
if in_section.kind() == SectionKind::Metadata {
continue;
}
let out_section = *out_sections.get(&in_section.index()).unwrap();
for (offset, in_relocation) in in_section.relocations() {
let symbol = match in_relocation.target() {
RelocationTarget::Symbol(symbol) => *out_symbols.get(&symbol).unwrap(),
RelocationTarget::Section(section) => {
out_object.section_symbol(*out_sections.get(§ion).unwrap())
}
_ => panic!("unknown relocation target for {:?}", in_relocation),
};
let out_relocation = write::Relocation {
offset,
size: in_relocation.size(),
kind: in_relocation.kind(),
encoding: in_relocation.encoding(),
symbol,
addend: in_relocation.addend(),
};
out_object
.add_relocation(out_section, out_relocation)
.unwrap();
}
}
for in_comdat in in_object.comdats() {
let mut sections = Vec::new();
for in_section in in_comdat.sections() {
sections.push(*out_sections.get(&in_section).unwrap());
}
out_object.add_comdat(write::Comdat {
kind: in_comdat.kind(),
symbol: *out_symbols.get(&in_comdat.symbol()).unwrap(),
sections,
});
}
let out_data = out_object.write().unwrap();
if let Err(err) = fs::write(&out_file_path, out_data) {
eprintln!("Failed to write file '{}': {}", out_file_path, err);
process::exit(1);
}
}
|
