| 1 | use core::fmt::Debug; |
| 2 | use core::{iter, slice, str}; |
| 3 | |
| 4 | use crate::elf; |
| 5 | use crate::endian::{Endianness, U32Bytes}; |
| 6 | use crate::read::{self, ComdatKind, ObjectComdat, ReadError, ReadRef, SectionIndex, SymbolIndex}; |
| 7 | |
| 8 | use super::{ElfFile, FileHeader, SectionHeader, Sym}; |
| 9 | |
| 10 | /// An iterator for the COMDAT section groups in an [`ElfFile32`](super::ElfFile32). |
| 11 | pub type ElfComdatIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 12 | ElfComdatIterator<'data, 'file, elf::FileHeader32<Endian>, R>; |
| 13 | /// An iterator for the COMDAT section groups in an [`ElfFile64`](super::ElfFile64). |
| 14 | pub type ElfComdatIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 15 | ElfComdatIterator<'data, 'file, elf::FileHeader64<Endian>, R>; |
| 16 | |
| 17 | /// An iterator for the COMDAT section groups in an [`ElfFile`]. |
| 18 | #[derive (Debug)] |
| 19 | pub struct ElfComdatIterator<'data, 'file, Elf, R = &'data [u8]> |
| 20 | where |
| 21 | Elf: FileHeader, |
| 22 | R: ReadRef<'data>, |
| 23 | { |
| 24 | file: &'file ElfFile<'data, Elf, R>, |
| 25 | iter: iter::Enumerate<slice::Iter<'data, Elf::SectionHeader>>, |
| 26 | } |
| 27 | |
| 28 | impl<'data, 'file, Elf, R> ElfComdatIterator<'data, 'file, Elf, R> |
| 29 | where |
| 30 | Elf: FileHeader, |
| 31 | R: ReadRef<'data>, |
| 32 | { |
| 33 | pub(super) fn new( |
| 34 | file: &'file ElfFile<'data, Elf, R>, |
| 35 | ) -> ElfComdatIterator<'data, 'file, Elf, R> { |
| 36 | let mut iter: impl Iterator = file.sections.iter().enumerate(); |
| 37 | iter.next(); // Skip null section. |
| 38 | ElfComdatIterator { file, iter } |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | impl<'data, 'file, Elf, R> Iterator for ElfComdatIterator<'data, 'file, Elf, R> |
| 43 | where |
| 44 | Elf: FileHeader, |
| 45 | R: ReadRef<'data>, |
| 46 | { |
| 47 | type Item = ElfComdat<'data, 'file, Elf, R>; |
| 48 | |
| 49 | fn next(&mut self) -> Option<Self::Item> { |
| 50 | for (_index: usize, section: &'data ::SectionHeader) in self.iter.by_ref() { |
| 51 | if let Some(comdat: ElfComdat<'_, '_, Elf, R>) = ElfComdat::parse(self.file, section) { |
| 52 | return Some(comdat); |
| 53 | } |
| 54 | } |
| 55 | None |
| 56 | } |
| 57 | } |
| 58 | |
| 59 | /// A COMDAT section group in an [`ElfFile32`](super::ElfFile32). |
| 60 | pub type ElfComdat32<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 61 | ElfComdat<'data, 'file, elf::FileHeader32<Endian>, R>; |
| 62 | /// A COMDAT section group in an [`ElfFile64`](super::ElfFile64). |
| 63 | pub type ElfComdat64<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 64 | ElfComdat<'data, 'file, elf::FileHeader64<Endian>, R>; |
| 65 | |
| 66 | /// A COMDAT section group in an [`ElfFile`]. |
| 67 | /// |
| 68 | /// Most functionality is provided by the [`ObjectComdat`] trait implementation. |
| 69 | #[derive (Debug)] |
| 70 | pub struct ElfComdat<'data, 'file, Elf, R = &'data [u8]> |
| 71 | where |
| 72 | Elf: FileHeader, |
| 73 | R: ReadRef<'data>, |
| 74 | { |
| 75 | file: &'file ElfFile<'data, Elf, R>, |
| 76 | section: &'data Elf::SectionHeader, |
| 77 | sections: &'data [U32Bytes<Elf::Endian>], |
| 78 | } |
| 79 | |
| 80 | impl<'data, 'file, Elf, R> ElfComdat<'data, 'file, Elf, R> |
| 81 | where |
| 82 | Elf: FileHeader, |
| 83 | R: ReadRef<'data>, |
| 84 | { |
| 85 | fn parse( |
| 86 | file: &'file ElfFile<'data, Elf, R>, |
| 87 | section: &'data Elf::SectionHeader, |
| 88 | ) -> Option<ElfComdat<'data, 'file, Elf, R>> { |
| 89 | let (flag, sections) = section.group(file.endian, file.data).ok()??; |
| 90 | if flag != elf::GRP_COMDAT { |
| 91 | return None; |
| 92 | } |
| 93 | Some(ElfComdat { |
| 94 | file, |
| 95 | section, |
| 96 | sections, |
| 97 | }) |
| 98 | } |
| 99 | |
| 100 | /// Get the ELF file containing this COMDAT section group. |
| 101 | pub fn elf_file(&self) -> &'file ElfFile<'data, Elf, R> { |
| 102 | self.file |
| 103 | } |
| 104 | |
| 105 | /// Get the raw ELF section header for the COMDAT section group. |
| 106 | pub fn elf_section_header(&self) -> &'data Elf::SectionHeader { |
| 107 | self.section |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | impl<'data, 'file, Elf, R> read::private::Sealed for ElfComdat<'data, 'file, Elf, R> |
| 112 | where |
| 113 | Elf: FileHeader, |
| 114 | R: ReadRef<'data>, |
| 115 | { |
| 116 | } |
| 117 | |
| 118 | impl<'data, 'file, Elf, R> ObjectComdat<'data> for ElfComdat<'data, 'file, Elf, R> |
| 119 | where |
| 120 | Elf: FileHeader, |
| 121 | R: ReadRef<'data>, |
| 122 | { |
| 123 | type SectionIterator = ElfComdatSectionIterator<'data, 'file, Elf, R>; |
| 124 | |
| 125 | #[inline ] |
| 126 | fn kind(&self) -> ComdatKind { |
| 127 | ComdatKind::Any |
| 128 | } |
| 129 | |
| 130 | #[inline ] |
| 131 | fn symbol(&self) -> SymbolIndex { |
| 132 | SymbolIndex(self.section.sh_info(self.file.endian) as usize) |
| 133 | } |
| 134 | |
| 135 | fn name_bytes(&self) -> read::Result<&'data [u8]> { |
| 136 | // FIXME: check sh_link |
| 137 | let index = self.symbol(); |
| 138 | let symbol = self.file.symbols.symbol(index)?; |
| 139 | symbol.name(self.file.endian, self.file.symbols.strings()) |
| 140 | } |
| 141 | |
| 142 | fn name(&self) -> read::Result<&'data str> { |
| 143 | let name = self.name_bytes()?; |
| 144 | str::from_utf8(name) |
| 145 | .ok() |
| 146 | .read_error("Non UTF-8 ELF COMDAT name" ) |
| 147 | } |
| 148 | |
| 149 | fn sections(&self) -> Self::SectionIterator { |
| 150 | ElfComdatSectionIterator { |
| 151 | file: self.file, |
| 152 | sections: self.sections.iter(), |
| 153 | } |
| 154 | } |
| 155 | } |
| 156 | |
| 157 | /// An iterator for the sections in a COMDAT section group in an [`ElfFile32`](super::ElfFile32). |
| 158 | pub type ElfComdatSectionIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 159 | ElfComdatSectionIterator<'data, 'file, elf::FileHeader32<Endian>, R>; |
| 160 | /// An iterator for the sections in a COMDAT section group in an [`ElfFile64`](super::ElfFile64). |
| 161 | pub type ElfComdatSectionIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> = |
| 162 | ElfComdatSectionIterator<'data, 'file, elf::FileHeader64<Endian>, R>; |
| 163 | |
| 164 | /// An iterator for the sections in a COMDAT section group in an [`ElfFile`]. |
| 165 | #[derive (Debug)] |
| 166 | pub struct ElfComdatSectionIterator<'data, 'file, Elf, R = &'data [u8]> |
| 167 | where |
| 168 | Elf: FileHeader, |
| 169 | R: ReadRef<'data>, |
| 170 | { |
| 171 | file: &'file ElfFile<'data, Elf, R>, |
| 172 | sections: slice::Iter<'data, U32Bytes<Elf::Endian>>, |
| 173 | } |
| 174 | |
| 175 | impl<'data, 'file, Elf, R> Iterator for ElfComdatSectionIterator<'data, 'file, Elf, R> |
| 176 | where |
| 177 | Elf: FileHeader, |
| 178 | R: ReadRef<'data>, |
| 179 | { |
| 180 | type Item = SectionIndex; |
| 181 | |
| 182 | fn next(&mut self) -> Option<Self::Item> { |
| 183 | let index: &'data U32Bytes<{unknown}> = self.sections.next()?; |
| 184 | Some(SectionIndex(index.get(self.file.endian) as usize)) |
| 185 | } |
| 186 | } |
| 187 | |