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Commercial version will get a different brand name ("sold") and maintained in a separate repository than this repo.
157 lines
4.1 KiB
C++
157 lines
4.1 KiB
C++
#include "mold.h"
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#include "config.h"
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#include <cstring>
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#include <filesystem>
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#include <signal.h>
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#include <tbb/global_control.h>
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#ifdef USE_SYSTEM_MIMALLOC
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#include <mimalloc-new-delete.h>
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#endif
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#ifdef __FreeBSD__
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# include <sys/sysctl.h>
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# include <unistd.h>
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#endif
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namespace mold {
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std::string mold_version_string = MOLD_VERSION;
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namespace elf {
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int main(int argc, char **argv);
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}
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namespace macho {
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int main(int argc, char **argv);
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}
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static std::string get_mold_version() {
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if (mold_git_hash.empty())
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return MOLD_PRODUCT_NAME " " MOLD_VERSION " (compatible with GNU ld)";
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return MOLD_PRODUCT_NAME " " MOLD_VERSION " (" + mold_git_hash +
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"; compatible with GNU ld)";
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}
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void cleanup() {
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if (output_tmpfile)
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unlink(output_tmpfile);
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}
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std::string errno_string() {
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// strerror is not thread-safe, so guard it with a lock.
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static std::mutex mu;
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std::scoped_lock lock(mu);
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return strerror(errno);
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}
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// Returns the path of the mold executable itself
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std::string get_self_path() {
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#ifdef __FreeBSD__
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// /proc may not be mounted on FreeBSD. The proper way to get the
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// current executable's path is to use sysctl(2).
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int mib[4];
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mib[0] = CTL_KERN;
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mib[1] = KERN_PROC;
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mib[2] = KERN_PROC_PATHNAME;
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mib[3] = -1;
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size_t size;
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sysctl(mib, 4, NULL, &size, NULL, 0);
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std::string path;
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path.resize(size);
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sysctl(mib, 4, path.data(), &size, NULL, 0);
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return path;
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#else
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return std::filesystem::read_symlink("/proc/self/exe").string();
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#endif
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}
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// mold mmap's an output file, and the mmap succeeds even if there's
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// no enough space left on the filesystem. The actual disk blocks are
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// not allocated on the mmap call but when the program writes to it
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// for the first time.
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//
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// If a disk becomes full as a result of a write to an mmap'ed memory
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// region, the failure of the write is reported as a SIGBUS or structured
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// exeption with code EXCEPTION_IN_PAGE_ERROR on Windows. This
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// signal handler catches that signal and prints out a user-friendly
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// error message. Without this, it is very hard to realize that the
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// disk might be full.
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#ifdef _WIN32
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static LONG WINAPI vectored_handler(_EXCEPTION_POINTERS *exception_info) {
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static std::mutex mu;
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std::scoped_lock lock{mu};
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PEXCEPTION_RECORD exception_record = exception_info->ExceptionRecord;
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ULONG_PTR *exception_information = exception_record->ExceptionInformation;
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if (exception_record->ExceptionCode == EXCEPTION_IN_PAGE_ERROR &&
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(ULONG_PTR)output_buffer_start <= exception_information[1] &&
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exception_information[1] < (ULONG_PTR)output_buffer_end) {
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const char msg[] =
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MOLD_PRODUCT_NAME ": failed to write to an output file. Disk full?\n";
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(void)!write(_fileno(stderr), msg, sizeof(msg) - 1);
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}
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cleanup();
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_exit(1);
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}
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void install_signal_handler() {
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AddVectoredExceptionHandler(0, vectored_handler);
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}
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#else
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static void sighandler(int signo, siginfo_t *info, void *ucontext) {
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static std::mutex mu;
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std::scoped_lock lock{mu};
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if ((signo == SIGSEGV || signo == SIGBUS) &&
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output_buffer_start <= info->si_addr &&
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info->si_addr < output_buffer_end) {
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const char msg[] =
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MOLD_PRODUCT_NAME ": failed to write to an output file. Disk full?\n";
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(void)!write(STDERR_FILENO, msg, sizeof(msg) - 1);
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}
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cleanup();
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_exit(1);
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}
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void install_signal_handler() {
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struct sigaction action;
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action.sa_sigaction = sighandler;
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sigemptyset(&action.sa_mask);
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action.sa_flags = SA_SIGINFO;
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sigaction(SIGINT, &action, NULL);
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sigaction(SIGTERM, &action, NULL);
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sigaction(SIGBUS, &action, NULL);
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}
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#endif
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i64 get_default_thread_count() {
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// mold doesn't scale well above 32 threads.
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int n = tbb::global_control::active_value(
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tbb::global_control::max_allowed_parallelism);
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return std::min(n, 32);
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}
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} // namespace mold
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int main(int argc, char **argv) {
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mold::mold_version = mold::get_mold_version();
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mold::mold_product_name = MOLD_PRODUCT_NAME;
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std::string cmd = mold::filepath(argv[0]).filename().string();
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if (cmd == "ld64" || cmd == "ld64.mold")
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return mold::macho::main(argc, argv);
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return mold::elf::main(argc, argv);
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}
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