Adding upstream version 110.0.1.upstream/110.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

13 files changed, 1931 insertions, 0 deletions

diff --git a/third_party/rust/object/tests/integration.rs b/third_party/rust/object/tests/integration.rs
new file mode 100644
index 0000000000..6ebcb547f8
--- /dev/null
+++ b/third_party/rust/object/tests/integration.rs
@@ -0,0 +1,2 @@
+mod read;
+mod round_trip;
diff --git a/third_party/rust/object/tests/parse_self.rs b/third_party/rust/object/tests/parse_self.rs
new file mode 100644
index 0000000000..1e7df67158
--- /dev/null
+++ b/third_party/rust/object/tests/parse_self.rs
@@ -0,0 +1,25 @@
+#![cfg(feature = "read")]
+use object::{File, Object};
+use std::{env, fs};
+
+#[test]
+fn parse_self() {
+    let exe = env::current_exe().unwrap();
+    let data = fs::read(exe).unwrap();
+    let object = File::parse(&*data).unwrap();
+    assert!(object.entry() != 0);
+    assert!(object.sections().count() != 0);
+}
+
+#[cfg(feature = "std")]
+#[test]
+fn parse_self_cache() {
+    use object::read::{ReadCache, ReadRef};
+    let exe = env::current_exe().unwrap();
+    let file = fs::File::open(exe).unwrap();
+    let cache = ReadCache::new(file);
+    let data = cache.range(0, cache.len().unwrap());
+    let object = File::parse(data).unwrap();
+    assert!(object.entry() != 0);
+    assert!(object.sections().count() != 0);
+}
diff --git a/third_party/rust/object/tests/read/coff.rs b/third_party/rust/object/tests/read/coff.rs
new file mode 100644
index 0000000000..3e61ec284d
--- /dev/null
+++ b/third_party/rust/object/tests/read/coff.rs
@@ -0,0 +1,23 @@
+use object::{pe, read, Object, ObjectSection};
+use std::fs;
+use std::path::PathBuf;
+
+#[cfg(feature = "coff")]
+#[test]
+fn coff_extended_relocations() {
+    let path_to_obj: PathBuf = ["testfiles", "coff", "relocs_overflow.o"].iter().collect();
+    let contents = fs::read(&path_to_obj).expect("Could not read relocs_overflow.o");
+    let file =
+        read::coff::CoffFile::parse(&contents[..]).expect("Could not parse relocs_overflow.o");
+    let code_section = file
+        .section_by_name(".text")
+        .expect("Could not find .text section in relocs_overflow.o");
+    match code_section.flags() {
+        object::SectionFlags::Coff { characteristics } => {
+            assert!(characteristics & pe::IMAGE_SCN_LNK_NRELOC_OVFL != 0)
+        }
+        _ => panic!("Invalid section flags flavour."),
+    };
+    let relocations = code_section.relocations().collect::<Vec<_>>();
+    assert_eq!(relocations.len(), 65536);
+}
diff --git a/third_party/rust/object/tests/read/mod.rs b/third_party/rust/object/tests/read/mod.rs
new file mode 100644
index 0000000000..d60d1933b7
--- /dev/null
+++ b/third_party/rust/object/tests/read/mod.rs
@@ -0,0 +1,3 @@
+#![cfg(feature = "read")]
+
+mod coff;
diff --git a/third_party/rust/object/tests/round_trip/bss.rs b/third_party/rust/object/tests/round_trip/bss.rs
new file mode 100644
index 0000000000..1354fcc781
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/bss.rs
@@ -0,0 +1,255 @@
+#![cfg(all(feature = "read", feature = "write"))]
+
+use object::read::{Object, ObjectSection, ObjectSymbol};
+use object::{read, write};
+use object::{
+    Architecture, BinaryFormat, Endianness, SectionKind, SymbolFlags, SymbolKind, SymbolScope,
+};
+
+#[test]
+fn coff_x86_64_bss() {
+    let mut object =
+        write::Object::new(BinaryFormat::Coff, Architecture::X86_64, Endianness::Little);
+
+    let section = object.section_id(write::StandardSection::UninitializedData);
+
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"v1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 18, 4);
+
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"v2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 34, 8);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"bss.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Coff);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let bss = sections.next().unwrap();
+    println!("{:?}", bss);
+    let bss_index = bss.index();
+    assert_eq!(bss.name(), Ok(".bss"));
+    assert_eq!(bss.kind(), SectionKind::UninitializedData);
+    assert_eq!(bss.size(), 58);
+    assert_eq!(bss.data(), Ok(&[][..]));
+
+    let section = sections.next();
+    assert!(section.is_none(), "unexpected section {:?}", section);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(bss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v2"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(bss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 24);
+
+    let symbol = symbols.next();
+    assert!(symbol.is_none(), "unexpected symbol {:?}", symbol);
+}
+
+#[test]
+fn elf_x86_64_bss() {
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+
+    let section = object.section_id(write::StandardSection::UninitializedData);
+
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"v1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 18, 4);
+
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"v2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 34, 8);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"bss.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    assert_eq!(section.name(), Ok(""));
+    assert_eq!(section.kind(), SectionKind::Metadata);
+    assert_eq!(section.address(), 0);
+    assert_eq!(section.size(), 0);
+
+    let bss = sections.next().unwrap();
+    println!("{:?}", bss);
+    let bss_index = bss.index();
+    assert_eq!(bss.name(), Ok(".bss"));
+    assert_eq!(bss.kind(), SectionKind::UninitializedData);
+    assert_eq!(bss.size(), 58);
+    assert_eq!(bss.data(), Ok(&[][..]));
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok(""));
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(bss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.size(), 18);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v2"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(bss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 24);
+    assert_eq!(symbol.size(), 34);
+
+    let symbol = symbols.next();
+    assert!(symbol.is_none(), "unexpected symbol {:?}", symbol);
+}
+
+#[test]
+fn macho_x86_64_bss() {
+    let mut object = write::Object::new(
+        BinaryFormat::MachO,
+        Architecture::X86_64,
+        Endianness::Little,
+    );
+
+    let section = object.section_id(write::StandardSection::UninitializedData);
+
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"v1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 18, 4);
+
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"v2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 34, 8);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"bss.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::MachO);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let bss = sections.next().unwrap();
+    println!("{:?}", bss);
+    let bss_index = bss.index();
+    assert_eq!(bss.name(), Ok("__bss"));
+    assert_eq!(bss.segment_name(), Ok(Some("__DATA")));
+    assert_eq!(bss.kind(), SectionKind::UninitializedData);
+    assert_eq!(bss.size(), 58);
+    assert_eq!(bss.data(), Ok(&[][..]));
+
+    let section = sections.next();
+    assert!(section.is_none(), "unexpected section {:?}", section);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("_v1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(bss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("_v2"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(bss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 24);
+
+    let symbol = symbols.next();
+    assert!(symbol.is_none(), "unexpected symbol {:?}", symbol);
+}
diff --git a/third_party/rust/object/tests/round_trip/coff.rs b/third_party/rust/object/tests/round_trip/coff.rs
new file mode 100644
index 0000000000..6785dc367e
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/coff.rs
@@ -0,0 +1,56 @@
+use object::read::{Object, ObjectSection};
+use object::{read, write};
+use object::{
+    Architecture, BinaryFormat, Endianness, RelocationEncoding, RelocationKind, SymbolFlags,
+    SymbolKind, SymbolScope,
+};
+
+#[test]
+fn reloc_overflow() {
+    let mut object =
+        write::Object::new(BinaryFormat::Coff, Architecture::X86_64, Endianness::Little);
+    let text = object.section_id(write::StandardSection::Text);
+    object.append_section_data(text, &[0; 4], 4);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"f".to_vec(),
+        value: 0,
+        size: 4,
+        kind: SymbolKind::Text,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Section(text),
+        flags: SymbolFlags::None,
+    });
+    for i in 0..0x10000 {
+        object
+            .add_relocation(
+                text,
+                write::Relocation {
+                    offset: i,
+                    size: 64,
+                    kind: RelocationKind::Absolute,
+                    encoding: RelocationEncoding::Generic,
+                    symbol,
+                    addend: 0,
+                },
+            )
+            .unwrap();
+    }
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"reloc_overflow.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Coff);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let section = object.sections().next().unwrap();
+    assert_eq!(section.name(), Ok(".text"));
+
+    let mut i = 0;
+    for (offset, _relocation) in section.relocations() {
+        assert_eq!(offset, i);
+        i += 1;
+    }
+    assert_eq!(i, 0x10000);
+}
diff --git a/third_party/rust/object/tests/round_trip/comdat.rs b/third_party/rust/object/tests/round_trip/comdat.rs
new file mode 100644
index 0000000000..7b697a04c0
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/comdat.rs
@@ -0,0 +1,225 @@
+#![cfg(all(feature = "read", feature = "write"))]
+
+use object::pe;
+use object::read::{Object, ObjectComdat, ObjectSection, ObjectSymbol};
+use object::{read, write};
+use object::{
+    Architecture, BinaryFormat, ComdatKind, Endianness, SectionKind, SymbolFlags, SymbolKind,
+    SymbolScope,
+};
+
+#[test]
+fn coff_x86_64_comdat() {
+    let mut object =
+        write::Object::new(BinaryFormat::Coff, Architecture::X86_64, Endianness::Little);
+
+    let (section1, offset) =
+        object.add_subsection(write::StandardSection::Text, b"s1", &[0, 1, 2, 3], 4);
+    object.section_symbol(section1);
+    let (section2, _) =
+        object.add_subsection(write::StandardSection::Data, b"s1", &[0, 1, 2, 3], 4);
+    object.section_symbol(section2);
+
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"s1".to_vec(),
+        value: offset,
+        size: 4,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Section(section1),
+        flags: SymbolFlags::None,
+    });
+
+    object.add_comdat(write::Comdat {
+        kind: ComdatKind::NoDuplicates,
+        symbol,
+        sections: vec![section1, section2],
+    });
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"comdat.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Coff);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let section1 = sections.next().unwrap();
+    println!("{:?}", section1);
+    let section1_index = section1.index();
+    assert_eq!(section1.name(), Ok(".text$s1"));
+    assert_eq!(section1.kind(), SectionKind::Text);
+    assert_eq!(section1.address(), 0);
+    assert_eq!(section1.size(), 4);
+
+    let section2 = sections.next().unwrap();
+    println!("{:?}", section2);
+    let section2_index = section2.index();
+    assert_eq!(section2.name(), Ok(".data$s1"));
+    assert_eq!(section2.kind(), SectionKind::Data);
+    assert_eq!(section2.address(), 0);
+    assert_eq!(section2.size(), 4);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok(".text$s1"));
+    assert_eq!(symbol.kind(), SymbolKind::Section);
+    assert_eq!(
+        symbol.section(),
+        read::SymbolSection::Section(section1.index())
+    );
+    assert_eq!(
+        symbol.flags(),
+        SymbolFlags::CoffSection {
+            selection: pe::IMAGE_COMDAT_SELECT_NODUPLICATES,
+            associative_section: None
+        }
+    );
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok(".data$s1"));
+    assert_eq!(symbol.kind(), SymbolKind::Section);
+    assert_eq!(
+        symbol.section(),
+        read::SymbolSection::Section(section2.index())
+    );
+    assert_eq!(
+        symbol.flags(),
+        SymbolFlags::CoffSection {
+            selection: pe::IMAGE_COMDAT_SELECT_ASSOCIATIVE,
+            associative_section: Some(section1_index)
+        }
+    );
+
+    let symbol = symbols.next().unwrap();
+    let symbol_index = symbol.index();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("s1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(
+        symbol.section(),
+        read::SymbolSection::Section(section1.index())
+    );
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+
+    let symbol = symbols.next();
+    assert!(symbol.is_none(), "unexpected symbol {:?}", symbol);
+
+    let mut comdats = object.comdats();
+
+    let comdat = comdats.next().unwrap();
+    println!("{:?}", comdat);
+    assert_eq!(comdat.kind(), ComdatKind::NoDuplicates);
+    assert_eq!(comdat.symbol(), symbol_index);
+
+    let mut comdat_sections = comdat.sections();
+    assert_eq!(comdat_sections.next(), Some(section1_index));
+    assert_eq!(comdat_sections.next(), Some(section2_index));
+    assert_eq!(comdat_sections.next(), None);
+}
+
+#[test]
+fn elf_x86_64_comdat() {
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+
+    let (section1, offset) =
+        object.add_subsection(write::StandardSection::Text, b"s1", &[0, 1, 2, 3], 4);
+    let (section2, _) =
+        object.add_subsection(write::StandardSection::Data, b"s1", &[0, 1, 2, 3], 4);
+
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"s1".to_vec(),
+        value: offset,
+        size: 4,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Section(section1),
+        flags: SymbolFlags::None,
+    });
+
+    object.add_comdat(write::Comdat {
+        kind: ComdatKind::Any,
+        symbol,
+        sections: vec![section1, section2],
+    });
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"comdat.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    assert_eq!(section.name(), Ok(""));
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    assert_eq!(section.name(), Ok(".group"));
+
+    let section1 = sections.next().unwrap();
+    println!("{:?}", section1);
+    let section1_index = section1.index();
+    assert_eq!(section1.name(), Ok(".text.s1"));
+    assert_eq!(section1.kind(), SectionKind::Text);
+    assert_eq!(section1.address(), 0);
+    assert_eq!(section1.size(), 4);
+
+    let section2 = sections.next().unwrap();
+    println!("{:?}", section2);
+    let section2_index = section2.index();
+    assert_eq!(section2.name(), Ok(".data.s1"));
+    assert_eq!(section2.kind(), SectionKind::Data);
+    assert_eq!(section2.address(), 0);
+    assert_eq!(section2.size(), 4);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok(""));
+
+    let symbol = symbols.next().unwrap();
+    let symbol_index = symbol.index();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("s1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(
+        symbol.section(),
+        read::SymbolSection::Section(section1.index())
+    );
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+
+    let symbol = symbols.next();
+    assert!(symbol.is_none(), "unexpected symbol {:?}", symbol);
+
+    let mut comdats = object.comdats();
+
+    let comdat = comdats.next().unwrap();
+    println!("{:?}", comdat);
+    assert_eq!(comdat.kind(), ComdatKind::Any);
+    assert_eq!(comdat.symbol(), symbol_index);
+
+    let mut comdat_sections = comdat.sections();
+    assert_eq!(comdat_sections.next(), Some(section1_index));
+    assert_eq!(comdat_sections.next(), Some(section2_index));
+    assert_eq!(comdat_sections.next(), None);
+}
diff --git a/third_party/rust/object/tests/round_trip/common.rs b/third_party/rust/object/tests/round_trip/common.rs
new file mode 100644
index 0000000000..74d443830f
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/common.rs
@@ -0,0 +1,245 @@
+#![cfg(all(feature = "read", feature = "write"))]
+
+use object::read::{Object, ObjectSection, ObjectSymbol};
+use object::{read, write};
+use object::{
+    Architecture, BinaryFormat, Endianness, SectionKind, SymbolFlags, SymbolKind, SymbolScope,
+};
+
+#[test]
+fn coff_x86_64_common() {
+    let mut object =
+        write::Object::new(BinaryFormat::Coff, Architecture::X86_64, Endianness::Little);
+
+    let symbol = write::Symbol {
+        name: b"v1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    };
+    object.add_common_symbol(symbol, 4, 4);
+
+    let symbol = write::Symbol {
+        name: b"v2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    };
+    object.add_common_symbol(symbol, 8, 8);
+
+    // Also check undefined symbols, which are very similar.
+    let symbol = write::Symbol {
+        name: b"v3".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    };
+    object.add_symbol(symbol);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"common.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Coff);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section(), read::SymbolSection::Common);
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.size(), 4);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v2"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section(), read::SymbolSection::Common);
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.size(), 8);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v3"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section(), read::SymbolSection::Undefined);
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), true);
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.size(), 0);
+
+    let symbol = symbols.next();
+    assert!(symbol.is_none(), "unexpected symbol {:?}", symbol);
+}
+
+#[test]
+fn elf_x86_64_common() {
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+
+    let symbol = write::Symbol {
+        name: b"v1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    };
+    object.add_common_symbol(symbol, 4, 4);
+
+    let symbol = write::Symbol {
+        name: b"v2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    };
+    object.add_common_symbol(symbol, 8, 8);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"common.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok(""));
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section(), read::SymbolSection::Common);
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.size(), 4);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("v2"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section(), read::SymbolSection::Common);
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.size(), 8);
+
+    let symbol = symbols.next();
+    assert!(symbol.is_none(), "unexpected symbol {:?}", symbol);
+}
+
+#[test]
+fn macho_x86_64_common() {
+    let mut object = write::Object::new(
+        BinaryFormat::MachO,
+        Architecture::X86_64,
+        Endianness::Little,
+    );
+
+    let symbol = write::Symbol {
+        name: b"v1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    };
+    object.add_common_symbol(symbol, 4, 4);
+
+    let symbol = write::Symbol {
+        name: b"v2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Data,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    };
+    object.add_common_symbol(symbol, 8, 8);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"common.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::MachO);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let common = sections.next().unwrap();
+    println!("{:?}", common);
+    let common_index = common.index();
+    assert_eq!(common.name(), Ok("__common"));
+    assert_eq!(common.segment_name(), Ok(Some("__DATA")));
+    assert_eq!(common.kind(), SectionKind::Common);
+    assert_eq!(common.size(), 16);
+    assert_eq!(common.data(), Ok(&[][..]));
+
+    let section = sections.next();
+    assert!(section.is_none(), "unexpected section {:?}", section);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("_v1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(common_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 0);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("_v2"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(common_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.address(), 8);
+
+    let symbol = symbols.next();
+    assert!(symbol.is_none(), "unexpected symbol {:?}", symbol);
+}
diff --git a/third_party/rust/object/tests/round_trip/elf.rs b/third_party/rust/object/tests/round_trip/elf.rs
new file mode 100644
index 0000000000..048db5795a
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/elf.rs
@@ -0,0 +1,218 @@
+use object::read::elf::{FileHeader, SectionHeader};
+use object::read::{Object, ObjectSymbol};
+use object::{
+    elf, read, write, Architecture, BinaryFormat, Endianness, LittleEndian, SectionIndex,
+    SectionKind, SymbolFlags, SymbolKind, SymbolScope, SymbolSection, U32,
+};
+use std::io::Write;
+
+#[test]
+fn symtab_shndx() {
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+
+    for i in 0..0x10000 {
+        let name = format!("func{}", i).into_bytes();
+        let (section, offset) =
+            object.add_subsection(write::StandardSection::Text, &name, &[0xcc], 1);
+        object.add_symbol(write::Symbol {
+            name,
+            value: offset,
+            size: 1,
+            kind: SymbolKind::Text,
+            scope: SymbolScope::Linkage,
+            weak: false,
+            section: write::SymbolSection::Section(section),
+            flags: SymbolFlags::None,
+        });
+    }
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"symtab_shndx.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    for symbol in object.symbols().skip(1) {
+        assert_eq!(
+            symbol.section(),
+            SymbolSection::Section(SectionIndex(symbol.index().0))
+        );
+    }
+}
+
+#[cfg(feature = "compression")]
+#[test]
+fn compression_zlib() {
+    use object::read::ObjectSection;
+    use object::LittleEndian as LE;
+
+    let data = b"test data data data";
+    let len = data.len() as u64;
+
+    let mut ch = object::elf::CompressionHeader64::<LE>::default();
+    ch.ch_type.set(LE, object::elf::ELFCOMPRESS_ZLIB);
+    ch.ch_size.set(LE, len);
+    ch.ch_addralign.set(LE, 1);
+
+    let mut buf = Vec::new();
+    buf.write(object::bytes_of(&ch)).unwrap();
+    let mut encoder = flate2::write::ZlibEncoder::new(buf, flate2::Compression::default());
+    encoder.write_all(data).unwrap();
+    let compressed = encoder.finish().unwrap();
+
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+    let section = object.add_section(
+        Vec::new(),
+        b".debug_info".to_vec(),
+        object::SectionKind::Other,
+    );
+    object.section_mut(section).set_data(compressed, 1);
+    object.section_mut(section).flags = object::SectionFlags::Elf {
+        sh_flags: object::elf::SHF_COMPRESSED.into(),
+    };
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"compression.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let section = object.section_by_name(".debug_info").unwrap();
+    let uncompressed = section.uncompressed_data().unwrap();
+    assert_eq!(data, &*uncompressed);
+}
+
+#[cfg(feature = "compression")]
+#[test]
+fn compression_gnu() {
+    use object::read::ObjectSection;
+    use std::io::Write;
+
+    let data = b"test data data data";
+    let len = data.len() as u32;
+
+    let mut buf = Vec::new();
+    buf.write_all(b"ZLIB\0\0\0\0").unwrap();
+    buf.write_all(&len.to_be_bytes()).unwrap();
+    let mut encoder = flate2::write::ZlibEncoder::new(buf, flate2::Compression::default());
+    encoder.write_all(data).unwrap();
+    let compressed = encoder.finish().unwrap();
+
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+    let section = object.add_section(
+        Vec::new(),
+        b".zdebug_info".to_vec(),
+        object::SectionKind::Other,
+    );
+    object.section_mut(section).set_data(compressed, 1);
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"compression.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let section = object.section_by_name(".zdebug_info").unwrap();
+    let uncompressed = section.uncompressed_data().unwrap();
+    assert_eq!(data, &*uncompressed);
+}
+
+#[test]
+fn note() {
+    let endian = Endianness::Little;
+    let mut object = write::Object::new(BinaryFormat::Elf, Architecture::X86_64, endian);
+
+    // Add note section with align = 4.
+    let mut buffer = Vec::new();
+
+    buffer
+        .write(object::bytes_of(&elf::NoteHeader32 {
+            n_namesz: U32::new(endian, 6),
+            n_descsz: U32::new(endian, 11),
+            n_type: U32::new(endian, 1),
+        }))
+        .unwrap();
+    buffer.write(b"name1\0\0\0").unwrap();
+    buffer.write(b"descriptor\0\0").unwrap();
+
+    buffer
+        .write(object::bytes_of(&elf::NoteHeader32 {
+            n_namesz: U32::new(endian, 6),
+            n_descsz: U32::new(endian, 11),
+            n_type: U32::new(endian, 2),
+        }))
+        .unwrap();
+    buffer.write(b"name2\0\0\0").unwrap();
+    buffer.write(b"descriptor\0\0").unwrap();
+
+    let section = object.add_section(Vec::new(), b".note4".to_vec(), SectionKind::Note);
+    object.section_mut(section).set_data(buffer, 4);
+
+    // Add note section with align = 8.
+    let mut buffer = Vec::new();
+
+    buffer
+        .write(object::bytes_of(&elf::NoteHeader32 {
+            n_namesz: U32::new(endian, 6),
+            n_descsz: U32::new(endian, 11),
+            n_type: U32::new(endian, 1),
+        }))
+        .unwrap();
+    buffer.write(b"name1\0\0\0\0\0\0\0").unwrap();
+    buffer.write(b"descriptor\0\0\0\0\0\0").unwrap();
+
+    buffer
+        .write(object::bytes_of(&elf::NoteHeader32 {
+            n_namesz: U32::new(endian, 4),
+            n_descsz: U32::new(endian, 11),
+            n_type: U32::new(endian, 2),
+        }))
+        .unwrap();
+    buffer.write(b"abc\0").unwrap();
+    buffer.write(b"descriptor\0\0\0\0\0\0").unwrap();
+
+    let section = object.add_section(Vec::new(), b".note8".to_vec(), SectionKind::Note);
+    object.section_mut(section).set_data(buffer, 8);
+
+    let bytes = &*object.write().unwrap();
+
+    //std::fs::write(&"note.o", &bytes).unwrap();
+
+    let header = elf::FileHeader64::parse(bytes).unwrap();
+    let endian: LittleEndian = header.endian().unwrap();
+    let sections = header.sections(endian, bytes).unwrap();
+
+    let section = sections.section(SectionIndex(1)).unwrap();
+    assert_eq!(sections.section_name(endian, section).unwrap(), b".note4");
+    assert_eq!(section.sh_addralign(endian), 4);
+    let mut notes = section.notes(endian, bytes).unwrap().unwrap();
+    let note = notes.next().unwrap().unwrap();
+    assert_eq!(note.name(), b"name1");
+    assert_eq!(note.desc(), b"descriptor\0");
+    assert_eq!(note.n_type(endian), 1);
+    let note = notes.next().unwrap().unwrap();
+    assert_eq!(note.name(), b"name2");
+    assert_eq!(note.desc(), b"descriptor\0");
+    assert_eq!(note.n_type(endian), 2);
+    assert!(notes.next().unwrap().is_none());
+
+    let section = sections.section(SectionIndex(2)).unwrap();
+    assert_eq!(sections.section_name(endian, section).unwrap(), b".note8");
+    assert_eq!(section.sh_addralign(endian), 8);
+    let mut notes = section.notes(endian, bytes).unwrap().unwrap();
+    let note = notes.next().unwrap().unwrap();
+    assert_eq!(note.name(), b"name1");
+    assert_eq!(note.desc(), b"descriptor\0");
+    assert_eq!(note.n_type(endian), 1);
+    let note = notes.next().unwrap().unwrap();
+    assert_eq!(note.name(), b"abc");
+    assert_eq!(note.desc(), b"descriptor\0");
+    assert_eq!(note.n_type(endian), 2);
+    assert!(notes.next().unwrap().is_none());
+}
diff --git a/third_party/rust/object/tests/round_trip/macho.rs b/third_party/rust/object/tests/round_trip/macho.rs
new file mode 100644
index 0000000000..ca3ad5ca2e
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/macho.rs
@@ -0,0 +1,24 @@
+use object::read::macho::MachHeader;
+use object::{macho, write, Architecture, BinaryFormat, Endianness};
+
+#[test]
+// Test that segment size is valid when the first section needs alignment.
+fn issue_286_segment_file_size() {
+    let mut object = write::Object::new(
+        BinaryFormat::MachO,
+        Architecture::X86_64,
+        Endianness::Little,
+    );
+
+    let text = object.section_id(write::StandardSection::Text);
+    object.append_section_data(text, &[1; 30], 0x1000);
+
+    let bytes = &*object.write().unwrap();
+    let header = macho::MachHeader64::parse(bytes, 0).unwrap();
+    let endian: Endianness = header.endian().unwrap();
+    let mut commands = header.load_commands(endian, bytes, 0).unwrap();
+    let command = commands.next().unwrap().unwrap();
+    let (segment, _) = command.segment_64().unwrap().unwrap();
+    assert_eq!(segment.vmsize.get(endian), 30);
+    assert_eq!(segment.filesize.get(endian), 30);
+}
diff --git a/third_party/rust/object/tests/round_trip/mod.rs b/third_party/rust/object/tests/round_trip/mod.rs
new file mode 100644
index 0000000000..31f7fd787f
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/mod.rs
@@ -0,0 +1,449 @@
+#![cfg(all(feature = "read", feature = "write"))]
+
+use object::read::{Object, ObjectSection, ObjectSymbol};
+use object::{read, write};
+use object::{
+    Architecture, BinaryFormat, Endianness, RelocationEncoding, RelocationKind, SectionKind,
+    SymbolFlags, SymbolKind, SymbolScope, SymbolSection,
+};
+
+mod bss;
+mod coff;
+mod comdat;
+mod common;
+mod elf;
+mod macho;
+mod section_flags;
+mod tls;
+
+#[test]
+fn coff_x86_64() {
+    let mut object =
+        write::Object::new(BinaryFormat::Coff, Architecture::X86_64, Endianness::Little);
+
+    object.add_file_symbol(b"file.c".to_vec());
+
+    let text = object.section_id(write::StandardSection::Text);
+    object.append_section_data(text, &[1; 30], 4);
+
+    let func1_offset = object.append_section_data(text, &[1; 30], 4);
+    assert_eq!(func1_offset, 32);
+    let func1_symbol = object.add_symbol(write::Symbol {
+        name: b"func1".to_vec(),
+        value: func1_offset,
+        size: 32,
+        kind: SymbolKind::Text,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Section(text),
+        flags: SymbolFlags::None,
+    });
+    object
+        .add_relocation(
+            text,
+            write::Relocation {
+                offset: 8,
+                size: 64,
+                kind: RelocationKind::Absolute,
+                encoding: RelocationEncoding::Generic,
+                symbol: func1_symbol,
+                addend: 0,
+            },
+        )
+        .unwrap();
+
+    let bytes = object.write().unwrap();
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Coff);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+    assert_eq!(object.endianness(), Endianness::Little);
+
+    let mut sections = object.sections();
+
+    let text = sections.next().unwrap();
+    println!("{:?}", text);
+    let text_index = text.index();
+    assert_eq!(text.name(), Ok(".text"));
+    assert_eq!(text.kind(), SectionKind::Text);
+    assert_eq!(text.address(), 0);
+    assert_eq!(text.size(), 62);
+    assert_eq!(&text.data().unwrap()[..30], &[1; 30]);
+    assert_eq!(&text.data().unwrap()[32..62], &[1; 30]);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("file.c"));
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.kind(), SymbolKind::File);
+    assert_eq!(symbol.section(), SymbolSection::None);
+    assert_eq!(symbol.scope(), SymbolScope::Compilation);
+    assert_eq!(symbol.is_weak(), false);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let func1_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("func1"));
+    assert_eq!(symbol.address(), func1_offset);
+    assert_eq!(symbol.kind(), SymbolKind::Text);
+    assert_eq!(symbol.section_index(), Some(text_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+
+    let mut relocations = text.relocations();
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 8);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(func1_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let map = object.symbol_map();
+    let symbol = map.get(func1_offset + 1).unwrap();
+    assert_eq!(symbol.address(), func1_offset);
+    assert_eq!(symbol.name(), "func1");
+    assert_eq!(map.get(func1_offset - 1), None);
+}
+
+#[test]
+fn elf_x86_64() {
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+
+    object.add_file_symbol(b"file.c".to_vec());
+
+    let text = object.section_id(write::StandardSection::Text);
+    object.append_section_data(text, &[1; 30], 4);
+
+    let func1_offset = object.append_section_data(text, &[1; 30], 4);
+    assert_eq!(func1_offset, 32);
+    let func1_symbol = object.add_symbol(write::Symbol {
+        name: b"func1".to_vec(),
+        value: func1_offset,
+        size: 32,
+        kind: SymbolKind::Text,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Section(text),
+        flags: SymbolFlags::None,
+    });
+    object
+        .add_relocation(
+            text,
+            write::Relocation {
+                offset: 8,
+                size: 64,
+                kind: RelocationKind::Absolute,
+                encoding: RelocationEncoding::Generic,
+                symbol: func1_symbol,
+                addend: 0,
+            },
+        )
+        .unwrap();
+
+    let bytes = object.write().unwrap();
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+    assert_eq!(object.endianness(), Endianness::Little);
+
+    let mut sections = object.sections();
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    assert_eq!(section.name(), Ok(""));
+    assert_eq!(section.kind(), SectionKind::Metadata);
+    assert_eq!(section.address(), 0);
+    assert_eq!(section.size(), 0);
+
+    let text = sections.next().unwrap();
+    println!("{:?}", text);
+    let text_index = text.index();
+    assert_eq!(text.name(), Ok(".text"));
+    assert_eq!(text.kind(), SectionKind::Text);
+    assert_eq!(text.address(), 0);
+    assert_eq!(text.size(), 62);
+    assert_eq!(&text.data().unwrap()[..30], &[1; 30]);
+    assert_eq!(&text.data().unwrap()[32..62], &[1; 30]);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok(""));
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.kind(), SymbolKind::Null);
+    assert_eq!(symbol.section_index(), None);
+    assert_eq!(symbol.scope(), SymbolScope::Unknown);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), true);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("file.c"));
+    assert_eq!(symbol.address(), 0);
+    assert_eq!(symbol.kind(), SymbolKind::File);
+    assert_eq!(symbol.section(), SymbolSection::None);
+    assert_eq!(symbol.scope(), SymbolScope::Compilation);
+    assert_eq!(symbol.is_weak(), false);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let func1_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("func1"));
+    assert_eq!(symbol.address(), func1_offset);
+    assert_eq!(symbol.kind(), SymbolKind::Text);
+    assert_eq!(symbol.section_index(), Some(text_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+
+    let mut relocations = text.relocations();
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 8);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(func1_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let map = object.symbol_map();
+    let symbol = map.get(func1_offset + 1).unwrap();
+    assert_eq!(symbol.address(), func1_offset);
+    assert_eq!(symbol.name(), "func1");
+    assert_eq!(map.get(func1_offset - 1), None);
+}
+
+#[test]
+fn elf_any() {
+    for (arch, endian) in [
+        (Architecture::Aarch64, Endianness::Little),
+        (Architecture::Arm, Endianness::Little),
+        (Architecture::Avr, Endianness::Little),
+        (Architecture::Bpf, Endianness::Little),
+        (Architecture::I386, Endianness::Little),
+        (Architecture::X86_64, Endianness::Little),
+        (Architecture::X86_64_X32, Endianness::Little),
+        (Architecture::Hexagon, Endianness::Little),
+        (Architecture::LoongArch64, Endianness::Little),
+        (Architecture::Mips, Endianness::Little),
+        (Architecture::Mips64, Endianness::Little),
+        (Architecture::Msp430, Endianness::Little),
+        (Architecture::PowerPc, Endianness::Big),
+        (Architecture::PowerPc64, Endianness::Big),
+        (Architecture::Riscv32, Endianness::Little),
+        (Architecture::Riscv64, Endianness::Little),
+        (Architecture::S390x, Endianness::Big),
+        (Architecture::Sparc64, Endianness::Big),
+        (Architecture::Xtensa, Endianness::Little),
+    ]
+    .iter()
+    .copied()
+    {
+        let mut object = write::Object::new(BinaryFormat::Elf, arch, endian);
+
+        let section = object.section_id(write::StandardSection::Data);
+        object.append_section_data(section, &[1; 30], 4);
+        let symbol = object.section_symbol(section);
+
+        object
+            .add_relocation(
+                section,
+                write::Relocation {
+                    offset: 8,
+                    size: 32,
+                    kind: RelocationKind::Absolute,
+                    encoding: RelocationEncoding::Generic,
+                    symbol,
+                    addend: 0,
+                },
+            )
+            .unwrap();
+        if arch.address_size().unwrap().bytes() >= 8 {
+            object
+                .add_relocation(
+                    section,
+                    write::Relocation {
+                        offset: 16,
+                        size: 64,
+                        kind: RelocationKind::Absolute,
+                        encoding: RelocationEncoding::Generic,
+                        symbol,
+                        addend: 0,
+                    },
+                )
+                .unwrap();
+        }
+
+        let bytes = object.write().unwrap();
+        let object = read::File::parse(&*bytes).unwrap();
+        println!("{:?}", object.architecture());
+        assert_eq!(object.format(), BinaryFormat::Elf);
+        assert_eq!(object.architecture(), arch);
+        assert_eq!(object.endianness(), endian);
+
+        let mut sections = object.sections();
+
+        let section = sections.next().unwrap();
+        println!("{:?}", section);
+        assert_eq!(section.name(), Ok(""));
+        assert_eq!(section.kind(), SectionKind::Metadata);
+        assert_eq!(section.address(), 0);
+        assert_eq!(section.size(), 0);
+
+        let data = sections.next().unwrap();
+        println!("{:?}", data);
+        assert_eq!(data.name(), Ok(".data"));
+        assert_eq!(data.kind(), SectionKind::Data);
+
+        let mut relocations = data.relocations();
+
+        let (offset, relocation) = relocations.next().unwrap();
+        println!("{:?}", relocation);
+        assert_eq!(offset, 8);
+        assert_eq!(relocation.kind(), RelocationKind::Absolute);
+        assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+        assert_eq!(relocation.size(), 32);
+        assert_eq!(relocation.addend(), 0);
+
+        if arch.address_size().unwrap().bytes() >= 8 {
+            let (offset, relocation) = relocations.next().unwrap();
+            println!("{:?}", relocation);
+            assert_eq!(offset, 16);
+            assert_eq!(relocation.kind(), RelocationKind::Absolute);
+            assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+            assert_eq!(relocation.size(), 64);
+            assert_eq!(relocation.addend(), 0);
+        }
+    }
+}
+
+#[test]
+fn macho_x86_64() {
+    let mut object = write::Object::new(
+        BinaryFormat::MachO,
+        Architecture::X86_64,
+        Endianness::Little,
+    );
+
+    object.add_file_symbol(b"file.c".to_vec());
+
+    let text = object.section_id(write::StandardSection::Text);
+    object.append_section_data(text, &[1; 30], 4);
+
+    let func1_offset = object.append_section_data(text, &[1; 30], 4);
+    assert_eq!(func1_offset, 32);
+    let func1_symbol = object.add_symbol(write::Symbol {
+        name: b"func1".to_vec(),
+        value: func1_offset,
+        size: 32,
+        kind: SymbolKind::Text,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Section(text),
+        flags: SymbolFlags::None,
+    });
+    object
+        .add_relocation(
+            text,
+            write::Relocation {
+                offset: 8,
+                size: 64,
+                kind: RelocationKind::Absolute,
+                encoding: RelocationEncoding::Generic,
+                symbol: func1_symbol,
+                addend: 0,
+            },
+        )
+        .unwrap();
+    object
+        .add_relocation(
+            text,
+            write::Relocation {
+                offset: 16,
+                size: 32,
+                kind: RelocationKind::Relative,
+                encoding: RelocationEncoding::Generic,
+                symbol: func1_symbol,
+                addend: -4,
+            },
+        )
+        .unwrap();
+
+    let bytes = object.write().unwrap();
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::MachO);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+    assert_eq!(object.endianness(), Endianness::Little);
+
+    let mut sections = object.sections();
+
+    let text = sections.next().unwrap();
+    println!("{:?}", text);
+    let text_index = text.index();
+    assert_eq!(text.name(), Ok("__text"));
+    assert_eq!(text.segment_name(), Ok(Some("__TEXT")));
+    assert_eq!(text.kind(), SectionKind::Text);
+    assert_eq!(text.address(), 0);
+    assert_eq!(text.size(), 62);
+    assert_eq!(&text.data().unwrap()[..30], &[1; 30]);
+    assert_eq!(&text.data().unwrap()[32..62], &[1; 30]);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let func1_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("_func1"));
+    assert_eq!(symbol.address(), func1_offset);
+    assert_eq!(symbol.kind(), SymbolKind::Text);
+    assert_eq!(symbol.section_index(), Some(text_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+
+    let mut relocations = text.relocations();
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 8);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(func1_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 16);
+    assert_eq!(relocation.kind(), RelocationKind::Relative);
+    assert_eq!(relocation.encoding(), RelocationEncoding::X86RipRelative);
+    assert_eq!(relocation.size(), 32);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(func1_symbol)
+    );
+    assert_eq!(relocation.addend(), -4);
+
+    let map = object.symbol_map();
+    let symbol = map.get(func1_offset + 1).unwrap();
+    assert_eq!(symbol.address(), func1_offset);
+    assert_eq!(symbol.name(), "_func1");
+    assert_eq!(map.get(func1_offset - 1), None);
+}
diff --git a/third_party/rust/object/tests/round_trip/section_flags.rs b/third_party/rust/object/tests/round_trip/section_flags.rs
new file mode 100644
index 0000000000..b1ca398b4c
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/section_flags.rs
@@ -0,0 +1,90 @@
+#![cfg(all(feature = "read", feature = "write"))]
+
+use object::read::{Object, ObjectSection};
+use object::{read, write};
+use object::{Architecture, BinaryFormat, Endianness, SectionFlags, SectionKind};
+
+#[test]
+fn coff_x86_64_section_flags() {
+    let mut object =
+        write::Object::new(BinaryFormat::Coff, Architecture::X86_64, Endianness::Little);
+
+    let section = object.add_section(Vec::new(), b".text".to_vec(), SectionKind::Text);
+    object.section_mut(section).flags = SectionFlags::Coff {
+        characteristics: object::pe::IMAGE_SCN_MEM_WRITE,
+    };
+
+    let bytes = object.write().unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Coff);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+    let section = sections.next().unwrap();
+    assert_eq!(section.name(), Ok(".text"));
+    assert_eq!(
+        section.flags(),
+        SectionFlags::Coff {
+            characteristics: object::pe::IMAGE_SCN_MEM_WRITE | object::pe::IMAGE_SCN_ALIGN_1BYTES,
+        }
+    );
+}
+
+#[test]
+fn elf_x86_64_section_flags() {
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+
+    let section = object.add_section(Vec::new(), b".text".to_vec(), SectionKind::Text);
+    object.section_mut(section).flags = SectionFlags::Elf {
+        sh_flags: object::elf::SHF_WRITE.into(),
+    };
+
+    let bytes = object.write().unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+    sections.next().unwrap();
+    let section = sections.next().unwrap();
+    assert_eq!(section.name(), Ok(".text"));
+    assert_eq!(
+        section.flags(),
+        SectionFlags::Elf {
+            sh_flags: object::elf::SHF_WRITE.into(),
+        }
+    );
+}
+
+#[test]
+fn macho_x86_64_section_flags() {
+    let mut object = write::Object::new(
+        BinaryFormat::MachO,
+        Architecture::X86_64,
+        Endianness::Little,
+    );
+
+    let section = object.add_section(Vec::new(), b".text".to_vec(), SectionKind::Text);
+    object.section_mut(section).flags = SectionFlags::MachO {
+        flags: object::macho::S_ATTR_SELF_MODIFYING_CODE,
+    };
+
+    let bytes = object.write().unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::MachO);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+    let section = sections.next().unwrap();
+    assert_eq!(section.name(), Ok(".text"));
+    assert_eq!(
+        section.flags(),
+        SectionFlags::MachO {
+            flags: object::macho::S_ATTR_SELF_MODIFYING_CODE,
+        }
+    );
+}
diff --git a/third_party/rust/object/tests/round_trip/tls.rs b/third_party/rust/object/tests/round_trip/tls.rs
new file mode 100644
index 0000000000..999e2f1815
--- /dev/null
+++ b/third_party/rust/object/tests/round_trip/tls.rs
@@ -0,0 +1,316 @@
+#![cfg(all(feature = "read", feature = "write"))]
+
+use object::read::{Object, ObjectSection, ObjectSymbol};
+use object::{read, write};
+use object::{
+    Architecture, BinaryFormat, Endianness, RelocationEncoding, RelocationKind, SectionKind,
+    SymbolFlags, SymbolKind, SymbolScope,
+};
+
+#[test]
+fn coff_x86_64_tls() {
+    let mut object =
+        write::Object::new(BinaryFormat::Coff, Architecture::X86_64, Endianness::Little);
+
+    let section = object.section_id(write::StandardSection::Tls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_data(symbol, section, &[1; 30], 4);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"tls.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Coff);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    let tls_index = section.index();
+    assert_eq!(section.name(), Ok(".tls$"));
+    assert_eq!(section.kind(), SectionKind::Data);
+    assert_eq!(section.size(), 30);
+    assert_eq!(&section.data().unwrap()[..], &[1; 30]);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("tls1"));
+    assert_eq!(symbol.kind(), SymbolKind::Data);
+    assert_eq!(symbol.section_index(), Some(tls_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+}
+
+#[test]
+fn elf_x86_64_tls() {
+    let mut object =
+        write::Object::new(BinaryFormat::Elf, Architecture::X86_64, Endianness::Little);
+
+    let section = object.section_id(write::StandardSection::Tls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_data(symbol, section, &[1; 30], 4);
+
+    let section = object.section_id(write::StandardSection::UninitializedTls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 31, 4);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"tls.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::Elf);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    assert_eq!(section.name(), Ok(""));
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    let tdata_index = section.index();
+    assert_eq!(section.name(), Ok(".tdata"));
+    assert_eq!(section.kind(), SectionKind::Tls);
+    assert_eq!(section.size(), 30);
+    assert_eq!(&section.data().unwrap()[..], &[1; 30]);
+
+    let section = sections.next().unwrap();
+    println!("{:?}", section);
+    let tbss_index = section.index();
+    assert_eq!(section.name(), Ok(".tbss"));
+    assert_eq!(section.kind(), SectionKind::UninitializedTls);
+    assert_eq!(section.size(), 31);
+    assert_eq!(&section.data().unwrap()[..], &[]);
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok(""));
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("tls1"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(tdata_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.size(), 30);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("tls2"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(tbss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+    assert_eq!(symbol.size(), 31);
+}
+
+#[test]
+fn macho_x86_64_tls() {
+    let mut object = write::Object::new(
+        BinaryFormat::MachO,
+        Architecture::X86_64,
+        Endianness::Little,
+    );
+
+    let section = object.section_id(write::StandardSection::Tls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls1".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_data(symbol, section, &[1; 30], 4);
+
+    let section = object.section_id(write::StandardSection::UninitializedTls);
+    let symbol = object.add_symbol(write::Symbol {
+        name: b"tls2".to_vec(),
+        value: 0,
+        size: 0,
+        kind: SymbolKind::Tls,
+        scope: SymbolScope::Linkage,
+        weak: false,
+        section: write::SymbolSection::Undefined,
+        flags: SymbolFlags::None,
+    });
+    object.add_symbol_bss(symbol, section, 31, 4);
+
+    let bytes = object.write().unwrap();
+
+    //std::fs::write(&"tls.o", &bytes).unwrap();
+
+    let object = read::File::parse(&*bytes).unwrap();
+    assert_eq!(object.format(), BinaryFormat::MachO);
+    assert_eq!(object.architecture(), Architecture::X86_64);
+
+    let mut sections = object.sections();
+
+    let thread_data = sections.next().unwrap();
+    println!("{:?}", thread_data);
+    let thread_data_index = thread_data.index();
+    assert_eq!(thread_data.name(), Ok("__thread_data"));
+    assert_eq!(thread_data.segment_name(), Ok(Some("__DATA")));
+    assert_eq!(thread_data.kind(), SectionKind::Tls);
+    assert_eq!(thread_data.size(), 30);
+    assert_eq!(&thread_data.data().unwrap()[..], &[1; 30]);
+
+    let thread_vars = sections.next().unwrap();
+    println!("{:?}", thread_vars);
+    let thread_vars_index = thread_vars.index();
+    assert_eq!(thread_vars.name(), Ok("__thread_vars"));
+    assert_eq!(thread_vars.segment_name(), Ok(Some("__DATA")));
+    assert_eq!(thread_vars.kind(), SectionKind::TlsVariables);
+    assert_eq!(thread_vars.size(), 2 * 3 * 8);
+    assert_eq!(&thread_vars.data().unwrap()[..], &[0; 48][..]);
+
+    let thread_bss = sections.next().unwrap();
+    println!("{:?}", thread_bss);
+    let thread_bss_index = thread_bss.index();
+    assert_eq!(thread_bss.name(), Ok("__thread_bss"));
+    assert_eq!(thread_bss.segment_name(), Ok(Some("__DATA")));
+    assert_eq!(thread_bss.kind(), SectionKind::UninitializedTls);
+    assert_eq!(thread_bss.size(), 31);
+    assert_eq!(thread_bss.data(), Ok(&[][..]));
+
+    let mut symbols = object.symbols();
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("_tls1"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(thread_vars_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let tls1_init_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("_tls1$tlv$init"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(thread_data_index));
+    assert_eq!(symbol.scope(), SymbolScope::Compilation);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let tlv_bootstrap_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("__tlv_bootstrap"));
+    assert_eq!(symbol.kind(), SymbolKind::Unknown);
+    assert_eq!(symbol.section_index(), None);
+    assert_eq!(symbol.scope(), SymbolScope::Unknown);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), true);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    assert_eq!(symbol.name(), Ok("_tls2"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(thread_vars_index));
+    assert_eq!(symbol.scope(), SymbolScope::Linkage);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+
+    let symbol = symbols.next().unwrap();
+    println!("{:?}", symbol);
+    let tls2_init_symbol = symbol.index();
+    assert_eq!(symbol.name(), Ok("_tls2$tlv$init"));
+    assert_eq!(symbol.kind(), SymbolKind::Tls);
+    assert_eq!(symbol.section_index(), Some(thread_bss_index));
+    assert_eq!(symbol.scope(), SymbolScope::Compilation);
+    assert_eq!(symbol.is_weak(), false);
+    assert_eq!(symbol.is_undefined(), false);
+
+    let mut relocations = thread_vars.relocations();
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 0);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(tlv_bootstrap_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 16);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(tls1_init_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 24);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(tlv_bootstrap_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+
+    let (offset, relocation) = relocations.next().unwrap();
+    println!("{:?}", relocation);
+    assert_eq!(offset, 40);
+    assert_eq!(relocation.kind(), RelocationKind::Absolute);
+    assert_eq!(relocation.encoding(), RelocationEncoding::Generic);
+    assert_eq!(relocation.size(), 64);
+    assert_eq!(
+        relocation.target(),
+        read::RelocationTarget::Symbol(tls2_init_symbol)
+    );
+    assert_eq!(relocation.addend(), 0);
+}