Deleted vendor folder

1 files changed, 0 insertions, 1095 deletions

diff --git a/vendor/object/src/write/macho.rs b/vendor/object/src/write/macho.rs
deleted file mode 100644
index 1c61523..0000000
--- a/vendor/object/src/write/macho.rs
+++ /dev/null
@@ -1,1095 +0,0 @@
-use core::mem;
-
-use crate::endian::*;
-use crate::macho;
-use crate::write::string::*;
-use crate::write::util::*;
-use crate::write::*;
-use crate::AddressSize;
-
-#[derive(Default, Clone, Copy)]
-struct SectionOffsets {
-    index: usize,
-    offset: usize,
-    address: u64,
-    reloc_offset: usize,
-    reloc_count: usize,
-}
-
-#[derive(Default, Clone, Copy)]
-struct SymbolOffsets {
-    index: usize,
-    str_id: Option<StringId>,
-}
-
-/// The customizable portion of a [`macho::BuildVersionCommand`].
-#[derive(Debug, Default, Clone, Copy)]
-#[non_exhaustive] // May want to add the tool list?
-pub struct MachOBuildVersion {
-    /// One of the `PLATFORM_` constants (for example,
-    /// [`object::macho::PLATFORM_MACOS`](macho::PLATFORM_MACOS)).
-    pub platform: u32,
-    /// The minimum OS version, where `X.Y.Z` is encoded in nibbles as
-    /// `xxxx.yy.zz`.
-    pub minos: u32,
-    /// The SDK version as `X.Y.Z`, where `X.Y.Z` is encoded in nibbles as
-    /// `xxxx.yy.zz`.
-    pub sdk: u32,
-}
-
-impl MachOBuildVersion {
-    fn cmdsize(&self) -> u32 {
-        // Same size for both endianness, and we don't have `ntools`.
-        let sz = mem::size_of::<macho::BuildVersionCommand<Endianness>>();
-        debug_assert!(sz <= u32::MAX as usize);
-        sz as u32
-    }
-}
-
-// Public methods.
-impl<'a> Object<'a> {
-    /// Specify the Mach-O CPU subtype.
-    ///
-    /// Requires `feature = "macho"`.
-    #[inline]
-    pub fn set_macho_cpu_subtype(&mut self, cpu_subtype: u32) {
-        self.macho_cpu_subtype = Some(cpu_subtype);
-    }
-
-    /// Specify information for a Mach-O `LC_BUILD_VERSION` command.
-    ///
-    /// Requires `feature = "macho"`.
-    #[inline]
-    pub fn set_macho_build_version(&mut self, info: MachOBuildVersion) {
-        self.macho_build_version = Some(info);
-    }
-}
-
-// Private methods.
-impl<'a> Object<'a> {
-    pub(crate) fn macho_set_subsections_via_symbols(&mut self) {
-        let flags = match self.flags {
-            FileFlags::MachO { flags } => flags,
-            _ => 0,
-        };
-        self.flags = FileFlags::MachO {
-            flags: flags | macho::MH_SUBSECTIONS_VIA_SYMBOLS,
-        };
-    }
-
-    pub(crate) fn macho_segment_name(&self, segment: StandardSegment) -> &'static [u8] {
-        match segment {
-            StandardSegment::Text => &b"__TEXT"[..],
-            StandardSegment::Data => &b"__DATA"[..],
-            StandardSegment::Debug => &b"__DWARF"[..],
-        }
-    }
-
-    pub(crate) fn macho_section_info(
-        &self,
-        section: StandardSection,
-    ) -> (&'static [u8], &'static [u8], SectionKind, SectionFlags) {
-        match section {
-            StandardSection::Text => (
-                &b"__TEXT"[..],
-                &b"__text"[..],
-                SectionKind::Text,
-                SectionFlags::None,
-            ),
-            StandardSection::Data => (
-                &b"__DATA"[..],
-                &b"__data"[..],
-                SectionKind::Data,
-                SectionFlags::None,
-            ),
-            StandardSection::ReadOnlyData => (
-                &b"__TEXT"[..],
-                &b"__const"[..],
-                SectionKind::ReadOnlyData,
-                SectionFlags::None,
-            ),
-            StandardSection::ReadOnlyDataWithRel => (
-                &b"__DATA"[..],
-                &b"__const"[..],
-                SectionKind::ReadOnlyDataWithRel,
-                SectionFlags::None,
-            ),
-            StandardSection::ReadOnlyString => (
-                &b"__TEXT"[..],
-                &b"__cstring"[..],
-                SectionKind::ReadOnlyString,
-                SectionFlags::None,
-            ),
-            StandardSection::UninitializedData => (
-                &b"__DATA"[..],
-                &b"__bss"[..],
-                SectionKind::UninitializedData,
-                SectionFlags::None,
-            ),
-            StandardSection::Tls => (
-                &b"__DATA"[..],
-                &b"__thread_data"[..],
-                SectionKind::Tls,
-                SectionFlags::None,
-            ),
-            StandardSection::UninitializedTls => (
-                &b"__DATA"[..],
-                &b"__thread_bss"[..],
-                SectionKind::UninitializedTls,
-                SectionFlags::None,
-            ),
-            StandardSection::TlsVariables => (
-                &b"__DATA"[..],
-                &b"__thread_vars"[..],
-                SectionKind::TlsVariables,
-                SectionFlags::None,
-            ),
-            StandardSection::Common => (
-                &b"__DATA"[..],
-                &b"__common"[..],
-                SectionKind::Common,
-                SectionFlags::None,
-            ),
-            StandardSection::GnuProperty => {
-                // Unsupported section.
-                (&[], &[], SectionKind::Note, SectionFlags::None)
-            }
-        }
-    }
-
-    fn macho_tlv_bootstrap(&mut self) -> SymbolId {
-        match self.tlv_bootstrap {
-            Some(id) => id,
-            None => {
-                let id = self.add_symbol(Symbol {
-                    name: b"_tlv_bootstrap".to_vec(),
-                    value: 0,
-                    size: 0,
-                    kind: SymbolKind::Text,
-                    scope: SymbolScope::Dynamic,
-                    weak: false,
-                    section: SymbolSection::Undefined,
-                    flags: SymbolFlags::None,
-                });
-                self.tlv_bootstrap = Some(id);
-                id
-            }
-        }
-    }
-
-    /// Create the `__thread_vars` entry for a TLS variable.
-    ///
-    /// The symbol given by `symbol_id` will be updated to point to this entry.
-    ///
-    /// A new `SymbolId` will be returned. The caller must update this symbol
-    /// to point to the initializer.
-    ///
-    /// If `symbol_id` is not for a TLS variable, then it is returned unchanged.
-    pub(crate) fn macho_add_thread_var(&mut self, symbol_id: SymbolId) -> SymbolId {
-        let symbol = self.symbol_mut(symbol_id);
-        if symbol.kind != SymbolKind::Tls {
-            return symbol_id;
-        }
-
-        // Create the initializer symbol.
-        let mut name = symbol.name.clone();
-        name.extend_from_slice(b"$tlv$init");
-        let init_symbol_id = self.add_raw_symbol(Symbol {
-            name,
-            value: 0,
-            size: 0,
-            kind: SymbolKind::Tls,
-            scope: SymbolScope::Compilation,
-            weak: false,
-            section: SymbolSection::Undefined,
-            flags: SymbolFlags::None,
-        });
-
-        // Add the tlv entry.
-        // Three pointers in size:
-        //   - __tlv_bootstrap - used to make sure support exists
-        //   - spare pointer - used when mapped by the runtime
-        //   - pointer to symbol initializer
-        let section = self.section_id(StandardSection::TlsVariables);
-        let address_size = self.architecture.address_size().unwrap().bytes();
-        let size = u64::from(address_size) * 3;
-        let data = vec![0; size as usize];
-        let offset = self.append_section_data(section, &data, u64::from(address_size));
-
-        let tlv_bootstrap = self.macho_tlv_bootstrap();
-        self.add_relocation(
-            section,
-            Relocation {
-                offset,
-                size: address_size * 8,
-                kind: RelocationKind::Absolute,
-                encoding: RelocationEncoding::Generic,
-                symbol: tlv_bootstrap,
-                addend: 0,
-            },
-        )
-        .unwrap();
-        self.add_relocation(
-            section,
-            Relocation {
-                offset: offset + u64::from(address_size) * 2,
-                size: address_size * 8,
-                kind: RelocationKind::Absolute,
-                encoding: RelocationEncoding::Generic,
-                symbol: init_symbol_id,
-                addend: 0,
-            },
-        )
-        .unwrap();
-
-        // Update the symbol to point to the tlv.
-        let symbol = self.symbol_mut(symbol_id);
-        symbol.value = offset;
-        symbol.size = size;
-        symbol.section = SymbolSection::Section(section);
-
-        init_symbol_id
-    }
-
-    pub(crate) fn macho_fixup_relocation(&mut self, relocation: &mut Relocation) -> i64 {
-        let relative = match relocation.kind {
-            RelocationKind::Relative
-            | RelocationKind::GotRelative
-            | RelocationKind::PltRelative
-            | RelocationKind::MachO { relative: true, .. } => true,
-            _ => false,
-        };
-        if relative {
-            // For PC relative relocations on some architectures, the
-            // addend does not include the offset required due to the
-            // PC being different from the place of the relocation.
-            // This differs from other file formats, so adjust the
-            // addend here to account for this.
-            let pcrel_offset = match self.architecture {
-                Architecture::I386 => 4,
-                Architecture::X86_64 => match relocation.kind {
-                    RelocationKind::MachO {
-                        value: macho::X86_64_RELOC_SIGNED_1,
-                        ..
-                    } => 5,
-                    RelocationKind::MachO {
-                        value: macho::X86_64_RELOC_SIGNED_2,
-                        ..
-                    } => 6,
-                    RelocationKind::MachO {
-                        value: macho::X86_64_RELOC_SIGNED_4,
-                        ..
-                    } => 8,
-                    _ => 4,
-                },
-                // TODO: maybe missing support for some architectures and relocations
-                _ => 0,
-            };
-            relocation.addend += pcrel_offset;
-        }
-        // Aarch64 relocs of these sizes act as if they are double-word length
-        if self.architecture == Architecture::Aarch64 && matches!(relocation.size, 12 | 21 | 26) {
-            relocation.size = 32;
-        }
-        // Check for relocations that use an explicit addend.
-        if self.architecture == Architecture::Aarch64 {
-            if relocation.encoding == RelocationEncoding::AArch64Call {
-                return 0;
-            }
-            if let RelocationKind::MachO { value, .. } = relocation.kind {
-                match value {
-                    macho::ARM64_RELOC_BRANCH26
-                    | macho::ARM64_RELOC_PAGE21
-                    | macho::ARM64_RELOC_PAGEOFF12 => return 0,
-                    _ => {}
-                }
-            }
-        }
-        // Signify implicit addend.
-        let constant = relocation.addend;
-        relocation.addend = 0;
-        constant
-    }
-
-    pub(crate) fn macho_write(&self, buffer: &mut dyn WritableBuffer) -> Result<()> {
-        let address_size = self.architecture.address_size().unwrap();
-        let endian = self.endian;
-        let macho32 = MachO32 { endian };
-        let macho64 = MachO64 { endian };
-        let macho: &dyn MachO = match address_size {
-            AddressSize::U8 | AddressSize::U16 | AddressSize::U32 => &macho32,
-            AddressSize::U64 => &macho64,
-        };
-        let pointer_align = address_size.bytes() as usize;
-
-        // Calculate offsets of everything, and build strtab.
-        let mut offset = 0;
-
-        // Calculate size of Mach-O header.
-        offset += macho.mach_header_size();
-
-        // Calculate size of commands.
-        let mut ncmds = 0;
-        let command_offset = offset;
-
-        // Calculate size of segment command and section headers.
-        let segment_command_offset = offset;
-        let segment_command_len =
-            macho.segment_command_size() + self.sections.len() * macho.section_header_size();
-        offset += segment_command_len;
-        ncmds += 1;
-
-        // Calculate size of build version.
-        let build_version_offset = offset;
-        if let Some(version) = &self.macho_build_version {
-            offset += version.cmdsize() as usize;
-            ncmds += 1;
-        }
-
-        // Calculate size of symtab command.
-        let symtab_command_offset = offset;
-        let symtab_command_len = mem::size_of::<macho::SymtabCommand<Endianness>>();
-        offset += symtab_command_len;
-        ncmds += 1;
-
-        // Calculate size of dysymtab command.
-        let dysymtab_command_offset = offset;
-        let dysymtab_command_len = mem::size_of::<macho::DysymtabCommand<Endianness>>();
-        offset += dysymtab_command_len;
-        ncmds += 1;
-
-        let sizeofcmds = offset - command_offset;
-
-        // Calculate size of section data.
-        // Section data can immediately follow the load commands without any alignment padding.
-        let segment_file_offset = offset;
-        let mut section_offsets = vec![SectionOffsets::default(); self.sections.len()];
-        let mut address = 0;
-        for (index, section) in self.sections.iter().enumerate() {
-            section_offsets[index].index = 1 + index;
-            if !section.is_bss() {
-                address = align_u64(address, section.align);
-                section_offsets[index].address = address;
-                section_offsets[index].offset = segment_file_offset + address as usize;
-                address += section.size;
-            }
-        }
-        let segment_file_size = address as usize;
-        offset += address as usize;
-        for (index, section) in self.sections.iter().enumerate() {
-            if section.is_bss() {
-                debug_assert!(section.data.is_empty());
-                address = align_u64(address, section.align);
-                section_offsets[index].address = address;
-                address += section.size;
-            }
-        }
-
-        // Partition symbols and add symbol strings to strtab.
-        let mut strtab = StringTable::default();
-        let mut symbol_offsets = vec![SymbolOffsets::default(); self.symbols.len()];
-        let mut local_symbols = vec![];
-        let mut external_symbols = vec![];
-        let mut undefined_symbols = vec![];
-        for (index, symbol) in self.symbols.iter().enumerate() {
-            // The unified API allows creating symbols that we don't emit, so filter
-            // them out here.
-            //
-            // Since we don't actually emit the symbol kind, we validate it here too.
-            match symbol.kind {
-                SymbolKind::Text | SymbolKind::Data | SymbolKind::Tls | SymbolKind::Unknown => {}
-                SymbolKind::File | SymbolKind::Section => continue,
-                SymbolKind::Null | SymbolKind::Label => {
-                    return Err(Error(format!(
-                        "unimplemented symbol `{}` kind {:?}",
-                        symbol.name().unwrap_or(""),
-                        symbol.kind
-                    )));
-                }
-            }
-            if !symbol.name.is_empty() {
-                symbol_offsets[index].str_id = Some(strtab.add(&symbol.name));
-            }
-            if symbol.is_undefined() {
-                undefined_symbols.push(index);
-            } else if symbol.is_local() {
-                local_symbols.push(index);
-            } else {
-                external_symbols.push(index);
-            }
-        }
-
-        external_symbols.sort_by_key(|index| &*self.symbols[*index].name);
-        undefined_symbols.sort_by_key(|index| &*self.symbols[*index].name);
-
-        // Count symbols.
-        let mut nsyms = 0;
-        for index in local_symbols
-            .iter()
-            .copied()
-            .chain(external_symbols.iter().copied())
-            .chain(undefined_symbols.iter().copied())
-        {
-            symbol_offsets[index].index = nsyms;
-            nsyms += 1;
-        }
-
-        // Calculate size of relocations.
-        for (index, section) in self.sections.iter().enumerate() {
-            let count: usize = section
-                .relocations
-                .iter()
-                .map(|reloc| 1 + usize::from(reloc.addend != 0))
-                .sum();
-            if count != 0 {
-                offset = align(offset, pointer_align);
-                section_offsets[index].reloc_offset = offset;
-                section_offsets[index].reloc_count = count;
-                let len = count * mem::size_of::<macho::Relocation<Endianness>>();
-                offset += len;
-            }
-        }
-
-        // Calculate size of symtab.
-        offset = align(offset, pointer_align);
-        let symtab_offset = offset;
-        let symtab_len = nsyms * macho.nlist_size();
-        offset += symtab_len;
-
-        // Calculate size of strtab.
-        let strtab_offset = offset;
-        // Start with null name.
-        let mut strtab_data = vec![0];
-        strtab.write(1, &mut strtab_data);
-        write_align(&mut strtab_data, pointer_align);
-        offset += strtab_data.len();
-
-        // Start writing.
-        buffer
-            .reserve(offset)
-            .map_err(|_| Error(String::from("Cannot allocate buffer")))?;
-
-        // Write file header.
-        let (cputype, mut cpusubtype) = match (self.architecture, self.sub_architecture) {
-            (Architecture::Arm, None) => (macho::CPU_TYPE_ARM, macho::CPU_SUBTYPE_ARM_ALL),
-            (Architecture::Aarch64, None) => (macho::CPU_TYPE_ARM64, macho::CPU_SUBTYPE_ARM64_ALL),
-            (Architecture::Aarch64, Some(SubArchitecture::Arm64E)) => {
-                (macho::CPU_TYPE_ARM64, macho::CPU_SUBTYPE_ARM64E)
-            }
-            (Architecture::Aarch64_Ilp32, None) => {
-                (macho::CPU_TYPE_ARM64_32, macho::CPU_SUBTYPE_ARM64_32_V8)
-            }
-            (Architecture::I386, None) => (macho::CPU_TYPE_X86, macho::CPU_SUBTYPE_I386_ALL),
-            (Architecture::X86_64, None) => (macho::CPU_TYPE_X86_64, macho::CPU_SUBTYPE_X86_64_ALL),
-            (Architecture::PowerPc, None) => {
-                (macho::CPU_TYPE_POWERPC, macho::CPU_SUBTYPE_POWERPC_ALL)
-            }
-            (Architecture::PowerPc64, None) => {
-                (macho::CPU_TYPE_POWERPC64, macho::CPU_SUBTYPE_POWERPC_ALL)
-            }
-            _ => {
-                return Err(Error(format!(
-                    "unimplemented architecture {:?} with sub-architecture {:?}",
-                    self.architecture, self.sub_architecture
-                )));
-            }
-        };
-
-        if let Some(cpu_subtype) = self.macho_cpu_subtype {
-            cpusubtype = cpu_subtype;
-        }
-
-        let flags = match self.flags {
-            FileFlags::MachO { flags } => flags,
-            _ => 0,
-        };
-        macho.write_mach_header(
-            buffer,
-            MachHeader {
-                cputype,
-                cpusubtype,
-                filetype: macho::MH_OBJECT,
-                ncmds,
-                sizeofcmds: sizeofcmds as u32,
-                flags,
-            },
-        );
-
-        // Write segment command.
-        debug_assert_eq!(segment_command_offset, buffer.len());
-        macho.write_segment_command(
-            buffer,
-            SegmentCommand {
-                cmdsize: segment_command_len as u32,
-                segname: [0; 16],
-                vmaddr: 0,
-                vmsize: address,
-                fileoff: segment_file_offset as u64,
-                filesize: segment_file_size as u64,
-                maxprot: macho::VM_PROT_READ | macho::VM_PROT_WRITE | macho::VM_PROT_EXECUTE,
-                initprot: macho::VM_PROT_READ | macho::VM_PROT_WRITE | macho::VM_PROT_EXECUTE,
-                nsects: self.sections.len() as u32,
-                flags: 0,
-            },
-        );
-
-        // Write section headers.
-        for (index, section) in self.sections.iter().enumerate() {
-            let mut sectname = [0; 16];
-            sectname
-                .get_mut(..section.name.len())
-                .ok_or_else(|| {
-                    Error(format!(
-                        "section name `{}` is too long",
-                        section.name().unwrap_or(""),
-                    ))
-                })?
-                .copy_from_slice(&section.name);
-            let mut segname = [0; 16];
-            segname
-                .get_mut(..section.segment.len())
-                .ok_or_else(|| {
-                    Error(format!(
-                        "segment name `{}` is too long",
-                        section.segment().unwrap_or(""),
-                    ))
-                })?
-                .copy_from_slice(&section.segment);
-            let flags = if let SectionFlags::MachO { flags } = section.flags {
-                flags
-            } else {
-                match section.kind {
-                    SectionKind::Text => {
-                        macho::S_ATTR_PURE_INSTRUCTIONS | macho::S_ATTR_SOME_INSTRUCTIONS
-                    }
-                    SectionKind::Data => 0,
-                    SectionKind::ReadOnlyData | SectionKind::ReadOnlyDataWithRel => 0,
-                    SectionKind::ReadOnlyString => macho::S_CSTRING_LITERALS,
-                    SectionKind::UninitializedData | SectionKind::Common => macho::S_ZEROFILL,
-                    SectionKind::Tls => macho::S_THREAD_LOCAL_REGULAR,
-                    SectionKind::UninitializedTls => macho::S_THREAD_LOCAL_ZEROFILL,
-                    SectionKind::TlsVariables => macho::S_THREAD_LOCAL_VARIABLES,
-                    SectionKind::Debug => macho::S_ATTR_DEBUG,
-                    SectionKind::OtherString => macho::S_CSTRING_LITERALS,
-                    SectionKind::Other | SectionKind::Linker | SectionKind::Metadata => 0,
-                    SectionKind::Note | SectionKind::Unknown | SectionKind::Elf(_) => {
-                        return Err(Error(format!(
-                            "unimplemented section `{}` kind {:?}",
-                            section.name().unwrap_or(""),
-                            section.kind
-                        )));
-                    }
-                }
-            };
-            macho.write_section(
-                buffer,
-                SectionHeader {
-                    sectname,
-                    segname,
-                    addr: section_offsets[index].address,
-                    size: section.size,
-                    offset: section_offsets[index].offset as u32,
-                    align: section.align.trailing_zeros(),
-                    reloff: section_offsets[index].reloc_offset as u32,
-                    nreloc: section_offsets[index].reloc_count as u32,
-                    flags,
-                },
-            );
-        }
-
-        // Write build version.
-        if let Some(version) = &self.macho_build_version {
-            debug_assert_eq!(build_version_offset, buffer.len());
-            buffer.write(&macho::BuildVersionCommand {
-                cmd: U32::new(endian, macho::LC_BUILD_VERSION),
-                cmdsize: U32::new(endian, version.cmdsize()),
-                platform: U32::new(endian, version.platform),
-                minos: U32::new(endian, version.minos),
-                sdk: U32::new(endian, version.sdk),
-                ntools: U32::new(endian, 0),
-            });
-        }
-
-        // Write symtab command.
-        debug_assert_eq!(symtab_command_offset, buffer.len());
-        let symtab_command = macho::SymtabCommand {
-            cmd: U32::new(endian, macho::LC_SYMTAB),
-            cmdsize: U32::new(endian, symtab_command_len as u32),
-            symoff: U32::new(endian, symtab_offset as u32),
-            nsyms: U32::new(endian, nsyms as u32),
-            stroff: U32::new(endian, strtab_offset as u32),
-            strsize: U32::new(endian, strtab_data.len() as u32),
-        };
-        buffer.write(&symtab_command);
-
-        // Write dysymtab command.
-        debug_assert_eq!(dysymtab_command_offset, buffer.len());
-        let dysymtab_command = macho::DysymtabCommand {
-            cmd: U32::new(endian, macho::LC_DYSYMTAB),
-            cmdsize: U32::new(endian, dysymtab_command_len as u32),
-            ilocalsym: U32::new(endian, 0),
-            nlocalsym: U32::new(endian, local_symbols.len() as u32),
-            iextdefsym: U32::new(endian, local_symbols.len() as u32),
-            nextdefsym: U32::new(endian, external_symbols.len() as u32),
-            iundefsym: U32::new(
-                endian,
-                local_symbols.len() as u32 + external_symbols.len() as u32,
-            ),
-            nundefsym: U32::new(endian, undefined_symbols.len() as u32),
-            tocoff: U32::default(),
-            ntoc: U32::default(),
-            modtaboff: U32::default(),
-            nmodtab: U32::default(),
-            extrefsymoff: U32::default(),
-            nextrefsyms: U32::default(),
-            indirectsymoff: U32::default(),
-            nindirectsyms: U32::default(),
-            extreloff: U32::default(),
-            nextrel: U32::default(),
-            locreloff: U32::default(),
-            nlocrel: U32::default(),
-        };
-        buffer.write(&dysymtab_command);
-
-        // Write section data.
-        for (index, section) in self.sections.iter().enumerate() {
-            if !section.is_bss() {
-                buffer.resize(section_offsets[index].offset);
-                buffer.write_bytes(&section.data);
-            }
-        }
-        debug_assert_eq!(segment_file_offset + segment_file_size, buffer.len());
-
-        // Write relocations.
-        for (index, section) in self.sections.iter().enumerate() {
-            if !section.relocations.is_empty() {
-                write_align(buffer, pointer_align);
-                debug_assert_eq!(section_offsets[index].reloc_offset, buffer.len());
-                for reloc in &section.relocations {
-                    let r_length = match reloc.size {
-                        8 => 0,
-                        16 => 1,
-                        32 => 2,
-                        64 => 3,
-                        _ => return Err(Error(format!("unimplemented reloc size {:?}", reloc))),
-                    };
-
-                    // Write explicit addend.
-                    if reloc.addend != 0 {
-                        let r_type = match self.architecture {
-                            Architecture::Aarch64 | Architecture::Aarch64_Ilp32 => {
-                                macho::ARM64_RELOC_ADDEND
-                            }
-                            _ => {
-                                return Err(Error(format!("unimplemented relocation {:?}", reloc)))
-                            }
-                        };
-
-                        let reloc_info = macho::RelocationInfo {
-                            r_address: reloc.offset as u32,
-                            r_symbolnum: reloc.addend as u32,
-                            r_pcrel: false,
-                            r_length,
-                            r_extern: false,
-                            r_type,
-                        };
-                        buffer.write(&reloc_info.relocation(endian));
-                    }
-
-                    let r_extern;
-                    let r_symbolnum;
-                    let symbol = &self.symbols[reloc.symbol.0];
-                    if symbol.kind == SymbolKind::Section {
-                        r_symbolnum = section_offsets[symbol.section.id().unwrap().0].index as u32;
-                        r_extern = false;
-                    } else {
-                        r_symbolnum = symbol_offsets[reloc.symbol.0].index as u32;
-                        r_extern = true;
-                    }
-                    let (r_pcrel, r_type) = match self.architecture {
-                        Architecture::I386 => match reloc.kind {
-                            RelocationKind::Absolute => (false, macho::GENERIC_RELOC_VANILLA),
-                            _ => {
-                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
-                            }
-                        },
-                        Architecture::X86_64 => match (reloc.kind, reloc.encoding) {
-                            (RelocationKind::Absolute, RelocationEncoding::Generic) => {
-                                (false, macho::X86_64_RELOC_UNSIGNED)
-                            }
-                            (RelocationKind::Relative, RelocationEncoding::Generic) => {
-                                (true, macho::X86_64_RELOC_SIGNED)
-                            }
-                            (RelocationKind::Relative, RelocationEncoding::X86RipRelative) => {
-                                (true, macho::X86_64_RELOC_SIGNED)
-                            }
-                            (RelocationKind::Relative, RelocationEncoding::X86Branch) => {
-                                (true, macho::X86_64_RELOC_BRANCH)
-                            }
-                            (RelocationKind::PltRelative, RelocationEncoding::X86Branch) => {
-                                (true, macho::X86_64_RELOC_BRANCH)
-                            }
-                            (RelocationKind::GotRelative, RelocationEncoding::Generic) => {
-                                (true, macho::X86_64_RELOC_GOT)
-                            }
-                            (
-                                RelocationKind::GotRelative,
-                                RelocationEncoding::X86RipRelativeMovq,
-                            ) => (true, macho::X86_64_RELOC_GOT_LOAD),
-                            (RelocationKind::MachO { value, relative }, _) => (relative, value),
-                            _ => {
-                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
-                            }
-                        },
-                        Architecture::Aarch64 | Architecture::Aarch64_Ilp32 => {
-                            match (reloc.kind, reloc.encoding) {
-                                (RelocationKind::Absolute, RelocationEncoding::Generic) => {
-                                    (false, macho::ARM64_RELOC_UNSIGNED)
-                                }
-                                (RelocationKind::Relative, RelocationEncoding::AArch64Call) => {
-                                    (true, macho::ARM64_RELOC_BRANCH26)
-                                }
-                                (
-                                    RelocationKind::MachO { value, relative },
-                                    RelocationEncoding::Generic,
-                                ) => (relative, value),
-                                _ => {
-                                    return Err(Error(format!(
-                                        "unimplemented relocation {:?}",
-                                        reloc
-                                    )));
-                                }
-                            }
-                        }
-                        _ => {
-                            if let RelocationKind::MachO { value, relative } = reloc.kind {
-                                (relative, value)
-                            } else {
-                                return Err(Error(format!("unimplemented relocation {:?}", reloc)));
-                            }
-                        }
-                    };
-                    let reloc_info = macho::RelocationInfo {
-                        r_address: reloc.offset as u32,
-                        r_symbolnum,
-                        r_pcrel,
-                        r_length,
-                        r_extern,
-                        r_type,
-                    };
-                    buffer.write(&reloc_info.relocation(endian));
-                }
-            }
-        }
-
-        // Write symtab.
-        write_align(buffer, pointer_align);
-        debug_assert_eq!(symtab_offset, buffer.len());
-        for index in local_symbols
-            .iter()
-            .copied()
-            .chain(external_symbols.iter().copied())
-            .chain(undefined_symbols.iter().copied())
-        {
-            let symbol = &self.symbols[index];
-            // TODO: N_STAB
-            let (mut n_type, n_sect) = match symbol.section {
-                SymbolSection::Undefined => (macho::N_UNDF | macho::N_EXT, 0),
-                SymbolSection::Absolute => (macho::N_ABS, 0),
-                SymbolSection::Section(id) => (macho::N_SECT, id.0 + 1),
-                SymbolSection::None | SymbolSection::Common => {
-                    return Err(Error(format!(
-                        "unimplemented symbol `{}` section {:?}",
-                        symbol.name().unwrap_or(""),
-                        symbol.section
-                    )));
-                }
-            };
-            match symbol.scope {
-                SymbolScope::Unknown | SymbolScope::Compilation => {}
-                SymbolScope::Linkage => {
-                    n_type |= macho::N_EXT | macho::N_PEXT;
-                }
-                SymbolScope::Dynamic => {
-                    n_type |= macho::N_EXT;
-                }
-            }
-
-            let n_desc = if let SymbolFlags::MachO { n_desc } = symbol.flags {
-                n_desc
-            } else {
-                let mut n_desc = 0;
-                if symbol.weak {
-                    if symbol.is_undefined() {
-                        n_desc |= macho::N_WEAK_REF;
-                    } else {
-                        n_desc |= macho::N_WEAK_DEF;
-                    }
-                }
-                n_desc
-            };
-
-            let n_value = match symbol.section.id() {
-                Some(section) => section_offsets[section.0].address + symbol.value,
-                None => symbol.value,
-            };
-
-            let n_strx = symbol_offsets[index]
-                .str_id
-                .map(|id| strtab.get_offset(id))
-                .unwrap_or(0);
-
-            macho.write_nlist(
-                buffer,
-                Nlist {
-                    n_strx: n_strx as u32,
-                    n_type,
-                    n_sect: n_sect as u8,
-                    n_desc,
-                    n_value,
-                },
-            );
-        }
-
-        // Write strtab.
-        debug_assert_eq!(strtab_offset, buffer.len());
-        buffer.write_bytes(&strtab_data);
-
-        debug_assert_eq!(offset, buffer.len());
-
-        Ok(())
-    }
-}
-
-struct MachHeader {
-    cputype: u32,
-    cpusubtype: u32,
-    filetype: u32,
-    ncmds: u32,
-    sizeofcmds: u32,
-    flags: u32,
-}
-
-struct SegmentCommand {
-    cmdsize: u32,
-    segname: [u8; 16],
-    vmaddr: u64,
-    vmsize: u64,
-    fileoff: u64,
-    filesize: u64,
-    maxprot: u32,
-    initprot: u32,
-    nsects: u32,
-    flags: u32,
-}
-
-pub struct SectionHeader {
-    sectname: [u8; 16],
-    segname: [u8; 16],
-    addr: u64,
-    size: u64,
-    offset: u32,
-    align: u32,
-    reloff: u32,
-    nreloc: u32,
-    flags: u32,
-}
-
-struct Nlist {
-    n_strx: u32,
-    n_type: u8,
-    n_sect: u8,
-    n_desc: u16,
-    n_value: u64,
-}
-
-trait MachO {
-    fn mach_header_size(&self) -> usize;
-    fn segment_command_size(&self) -> usize;
-    fn section_header_size(&self) -> usize;
-    fn nlist_size(&self) -> usize;
-    fn write_mach_header(&self, buffer: &mut dyn WritableBuffer, section: MachHeader);
-    fn write_segment_command(&self, buffer: &mut dyn WritableBuffer, segment: SegmentCommand);
-    fn write_section(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader);
-    fn write_nlist(&self, buffer: &mut dyn WritableBuffer, nlist: Nlist);
-}
-
-struct MachO32<E> {
-    endian: E,
-}
-
-impl<E: Endian> MachO for MachO32<E> {
-    fn mach_header_size(&self) -> usize {
-        mem::size_of::<macho::MachHeader32<E>>()
-    }
-
-    fn segment_command_size(&self) -> usize {
-        mem::size_of::<macho::SegmentCommand32<E>>()
-    }
-
-    fn section_header_size(&self) -> usize {
-        mem::size_of::<macho::Section32<E>>()
-    }
-
-    fn nlist_size(&self) -> usize {
-        mem::size_of::<macho::Nlist32<E>>()
-    }
-
-    fn write_mach_header(&self, buffer: &mut dyn WritableBuffer, header: MachHeader) {
-        let endian = self.endian;
-        let magic = if endian.is_big_endian() {
-            macho::MH_MAGIC
-        } else {
-            macho::MH_CIGAM
-        };
-        let header = macho::MachHeader32 {
-            magic: U32::new(BigEndian, magic),
-            cputype: U32::new(endian, header.cputype),
-            cpusubtype: U32::new(endian, header.cpusubtype),
-            filetype: U32::new(endian, header.filetype),
-            ncmds: U32::new(endian, header.ncmds),
-            sizeofcmds: U32::new(endian, header.sizeofcmds),
-            flags: U32::new(endian, header.flags),
-        };
-        buffer.write(&header);
-    }
-
-    fn write_segment_command(&self, buffer: &mut dyn WritableBuffer, segment: SegmentCommand) {
-        let endian = self.endian;
-        let segment = macho::SegmentCommand32 {
-            cmd: U32::new(endian, macho::LC_SEGMENT),
-            cmdsize: U32::new(endian, segment.cmdsize),
-            segname: segment.segname,
-            vmaddr: U32::new(endian, segment.vmaddr as u32),
-            vmsize: U32::new(endian, segment.vmsize as u32),
-            fileoff: U32::new(endian, segment.fileoff as u32),
-            filesize: U32::new(endian, segment.filesize as u32),
-            maxprot: U32::new(endian, segment.maxprot),
-            initprot: U32::new(endian, segment.initprot),
-            nsects: U32::new(endian, segment.nsects),
-            flags: U32::new(endian, segment.flags),
-        };
-        buffer.write(&segment);
-    }
-
-    fn write_section(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader) {
-        let endian = self.endian;
-        let section = macho::Section32 {
-            sectname: section.sectname,
-            segname: section.segname,
-            addr: U32::new(endian, section.addr as u32),
-            size: U32::new(endian, section.size as u32),
-            offset: U32::new(endian, section.offset),
-            align: U32::new(endian, section.align),
-            reloff: U32::new(endian, section.reloff),
-            nreloc: U32::new(endian, section.nreloc),
-            flags: U32::new(endian, section.flags),
-            reserved1: U32::default(),
-            reserved2: U32::default(),
-        };
-        buffer.write(&section);
-    }
-
-    fn write_nlist(&self, buffer: &mut dyn WritableBuffer, nlist: Nlist) {
-        let endian = self.endian;
-        let nlist = macho::Nlist32 {
-            n_strx: U32::new(endian, nlist.n_strx),
-            n_type: nlist.n_type,
-            n_sect: nlist.n_sect,
-            n_desc: U16::new(endian, nlist.n_desc),
-            n_value: U32::new(endian, nlist.n_value as u32),
-        };
-        buffer.write(&nlist);
-    }
-}
-
-struct MachO64<E> {
-    endian: E,
-}
-
-impl<E: Endian> MachO for MachO64<E> {
-    fn mach_header_size(&self) -> usize {
-        mem::size_of::<macho::MachHeader64<E>>()
-    }
-
-    fn segment_command_size(&self) -> usize {
-        mem::size_of::<macho::SegmentCommand64<E>>()
-    }
-
-    fn section_header_size(&self) -> usize {
-        mem::size_of::<macho::Section64<E>>()
-    }
-
-    fn nlist_size(&self) -> usize {
-        mem::size_of::<macho::Nlist64<E>>()
-    }
-
-    fn write_mach_header(&self, buffer: &mut dyn WritableBuffer, header: MachHeader) {
-        let endian = self.endian;
-        let magic = if endian.is_big_endian() {
-            macho::MH_MAGIC_64
-        } else {
-            macho::MH_CIGAM_64
-        };
-        let header = macho::MachHeader64 {
-            magic: U32::new(BigEndian, magic),
-            cputype: U32::new(endian, header.cputype),
-            cpusubtype: U32::new(endian, header.cpusubtype),
-            filetype: U32::new(endian, header.filetype),
-            ncmds: U32::new(endian, header.ncmds),
-            sizeofcmds: U32::new(endian, header.sizeofcmds),
-            flags: U32::new(endian, header.flags),
-            reserved: U32::default(),
-        };
-        buffer.write(&header);
-    }
-
-    fn write_segment_command(&self, buffer: &mut dyn WritableBuffer, segment: SegmentCommand) {
-        let endian = self.endian;
-        let segment = macho::SegmentCommand64 {
-            cmd: U32::new(endian, macho::LC_SEGMENT_64),
-            cmdsize: U32::new(endian, segment.cmdsize),
-            segname: segment.segname,
-            vmaddr: U64::new(endian, segment.vmaddr),
-            vmsize: U64::new(endian, segment.vmsize),
-            fileoff: U64::new(endian, segment.fileoff),
-            filesize: U64::new(endian, segment.filesize),
-            maxprot: U32::new(endian, segment.maxprot),
-            initprot: U32::new(endian, segment.initprot),
-            nsects: U32::new(endian, segment.nsects),
-            flags: U32::new(endian, segment.flags),
-        };
-        buffer.write(&segment);
-    }
-
-    fn write_section(&self, buffer: &mut dyn WritableBuffer, section: SectionHeader) {
-        let endian = self.endian;
-        let section = macho::Section64 {
-            sectname: section.sectname,
-            segname: section.segname,
-            addr: U64::new(endian, section.addr),
-            size: U64::new(endian, section.size),
-            offset: U32::new(endian, section.offset),
-            align: U32::new(endian, section.align),
-            reloff: U32::new(endian, section.reloff),
-            nreloc: U32::new(endian, section.nreloc),
-            flags: U32::new(endian, section.flags),
-            reserved1: U32::default(),
-            reserved2: U32::default(),
-            reserved3: U32::default(),
-        };
-        buffer.write(&section);
-    }
-
-    fn write_nlist(&self, buffer: &mut dyn WritableBuffer, nlist: Nlist) {
-        let endian = self.endian;
-        let nlist = macho::Nlist64 {
-            n_strx: U32::new(endian, nlist.n_strx),
-            n_type: nlist.n_type,
-            n_sect: nlist.n_sect,
-            n_desc: U16::new(endian, nlist.n_desc),
-            n_value: U64Bytes::new(endian, nlist.n_value),
-        };
-        buffer.write(&nlist);
-    }
-}