mirror of
https://github.com/rui314/mold.git
synced 2024-12-26 18:02:30 +03:00
107 lines
2.9 KiB
C++
107 lines
2.9 KiB
C++
#include "mold.h"
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#include <fcntl.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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template <typename E>
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MemoryMappedFile<E> *
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MemoryMappedFile<E>::open(Context<E> &ctx, std::string path) {
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if (path.starts_with('/') && !ctx.arg.chroot.empty())
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path = ctx.arg.chroot + "/" + path_clean(path);
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struct stat st;
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if (stat(path.c_str(), &st) == -1)
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return nullptr;
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u64 mtime = (u64)st.st_mtim.tv_sec * 1000000000 + st.st_mtim.tv_nsec;
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MemoryMappedFile *mb = new MemoryMappedFile(path, nullptr, st.st_size, mtime);
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ctx.owning_mbs.push_back(std::unique_ptr<MemoryMappedFile>(mb));
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return mb;
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}
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template <typename E>
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MemoryMappedFile<E> *
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MemoryMappedFile<E>::must_open(Context<E> &ctx, std::string path) {
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if (MemoryMappedFile *mb = MemoryMappedFile::open(ctx, path))
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return mb;
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Fatal(ctx) << "cannot open " << path;
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}
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template <typename E>
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u8 *MemoryMappedFile<E>::data(Context<E> &ctx) {
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if (data_)
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return data_;
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std::lock_guard lock(mu);
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if (data_)
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return data_;
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i64 fd = ::open(name.c_str(), O_RDONLY);
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if (fd == -1)
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Fatal(ctx) << name << ": cannot open: " << strerror(errno);
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data_ = (u8 *)mmap(nullptr, size_, PROT_READ, MAP_PRIVATE, fd, 0);
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if (data_ == MAP_FAILED)
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Fatal(ctx) << name << ": mmap failed: " << strerror(errno);
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close(fd);
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return data_;
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}
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template <typename E>
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MemoryMappedFile<E> *
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MemoryMappedFile<E>::slice(Context<E> &ctx, std::string name, u64 start,
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u64 size) {
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MemoryMappedFile *mb = new MemoryMappedFile<E>(name, data_ + start, size);
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ctx.owning_mbs.push_back(std::unique_ptr<MemoryMappedFile>(mb));
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mb->parent = this;
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return mb;
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}
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template <typename E>
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MemoryMappedFile<E>::~MemoryMappedFile() {
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if (data_ && !parent)
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munmap(data_, size_);
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}
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template <typename E>
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static bool is_text_file(Context<E> &ctx, MemoryMappedFile<E> *mb) {
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u8 *data = mb->data(ctx);
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return mb->size() >= 4 &&
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isprint(data[0]) &&
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isprint(data[1]) &&
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isprint(data[2]) &&
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isprint(data[3]);
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}
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template <typename E>
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FileType get_file_type(Context<E> &ctx, MemoryMappedFile<E> *mb) {
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u8 *data = mb->data(ctx);
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if (mb->size() >= 20 && memcmp(data, "\177ELF", 4) == 0) {
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ElfEhdr<E> &ehdr = *(ElfEhdr<E> *)data;
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if (ehdr.e_type == ET_REL)
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return FileType::OBJ;
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if (ehdr.e_type == ET_DYN)
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return FileType::DSO;
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return FileType::UNKNOWN;
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}
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if (mb->size() >= 8 && memcmp(data, "!<arch>\n", 8) == 0)
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return FileType::AR;
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if (mb->size() >= 8 && memcmp(data, "!<thin>\n", 8) == 0)
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return FileType::THIN_AR;
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if (is_text_file(ctx, mb))
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return FileType::TEXT;
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return FileType::UNKNOWN;
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}
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#define INSTANTIATE(E) \
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template class MemoryMappedFile<E>; \
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template FileType get_file_type(Context<E> &, MemoryMappedFile<E> *)
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INSTANTIATE(X86_64);
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INSTANTIATE(I386);
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