207 lines
9 KiB
C++
207 lines
9 KiB
C++
/*
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Copyright (c) 2014-2015 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura, Gabriel Ebner, Sebastian Ullrich
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*/
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#include <unordered_map>
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#include <vector>
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#include <utility>
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#include <string>
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#include <sstream>
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#include <fstream>
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#include <algorithm>
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#include <sys/stat.h>
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#include "runtime/thread.h"
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#include "runtime/interrupt.h"
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#include "runtime/sstream.h"
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#include "runtime/hash.h"
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#include "runtime/io.h"
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#include "runtime/compact.h"
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#include "runtime/buffer.h"
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#include "util/io.h"
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#include "util/name_map.h"
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#include "library/module.h"
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#include "library/constants.h"
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#include "library/time_task.h"
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#include "library/util.h"
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#ifdef LEAN_WINDOWS
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#include <windows.h>
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#else
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#include <sys/mman.h>
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#include <unistd.h>
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#include <fcntl.h>
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#endif
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#if defined(__has_feature)
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#if __has_feature(address_sanitizer)
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#include <sanitizer/lsan_interface.h>
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#endif
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#endif
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namespace lean {
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// manually padded to multiple of word size, see `initialize_module`
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static char const * g_olean_header = "oleanfile!!!!!!!";
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extern "C" LEAN_EXPORT object * lean_save_module_data(b_obj_arg fname, b_obj_arg mod, b_obj_arg mdata, object *) {
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std::string olean_fn(string_cstr(fname));
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// we first write to a temp file and then move it to the correct path (possibly deleting an older file)
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// so that we neither expose partially-written files nor modify possibly memory-mapped files
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std::string olean_tmp_fn = olean_fn + ".tmp";
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try {
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std::ofstream out(olean_tmp_fn, std::ios_base::binary);
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if (out.fail()) {
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return io_result_mk_error((sstream() << "failed to create file '" << olean_fn << "'").str());
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}
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// Derive a base address that is uniformly distributed by deterministic, and should most likely
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// work for `mmap` on all interesting platforms
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// NOTE: an overlapping/non-compatible base address does not prevent the module from being imported,
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// merely from using `mmap` for that
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// Let's start with a hash of the module name. Note that while our string hash is a dubious 32-bit
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// algorithm, the mixing of multiple `Name` parts seems to result in a nicely distributed 64-bit
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// output
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size_t base_addr = name(mod, true).hash();
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// x86-64 user space is currently limited to the lower 47 bits
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// https://en.wikipedia.org/wiki/X86-64#Virtual_address_space_details
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// On Linux at least, the stack grows down from ~0x7fff... followed by shared libraries, so reserve
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// a bit of space for them (0x7fff...-0x7f00... = 1TB)
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base_addr = base_addr % 0x7f0000000000;
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// `mmap` addresses must be page-aligned. The default (non-huge) page size on x86-64 is 4KB.
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// `MapViewOfFileEx` addresses must be aligned to the "memory allocation granularity", which is 64KB.
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base_addr = base_addr & ~((1LL<<16) - 1);
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object_compactor compactor(reinterpret_cast<void *>(base_addr + strlen(g_olean_header) + sizeof(base_addr)));
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compactor(mdata);
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out.write(g_olean_header, strlen(g_olean_header));
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out.write(reinterpret_cast<char *>(&base_addr), sizeof(base_addr));
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out.write(static_cast<char const *>(compactor.data()), compactor.size());
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out.close();
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while (std::rename(olean_tmp_fn.c_str(), olean_fn.c_str()) != 0) {
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#ifdef LEAN_WINDOWS
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if (errno == EEXIST) {
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// Memory-mapped files can be deleted starting with Windows 10 using "POSIX semantics"
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HANDLE h_olean_fn = CreateFile(olean_fn.c_str(), GENERIC_READ | DELETE, FILE_SHARE_READ | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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if (h_olean_fn == INVALID_HANDLE_VALUE) {
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return io_result_mk_error((sstream() << "failed to open '" << olean_fn << "': " << GetLastError()).str());
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}
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FILE_DISPOSITION_INFO_EX fdi = { FILE_DISPOSITION_FLAG_DELETE | FILE_DISPOSITION_FLAG_POSIX_SEMANTICS };
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if (SetFileInformationByHandle(h_olean_fn, static_cast<FILE_INFO_BY_HANDLE_CLASS>(21) /* FileDispositionInfoEx */, &fdi, sizeof(fdi)) != 0) {
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lean_always_assert(CloseHandle(h_olean_fn));
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continue;
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} else {
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return io_result_mk_error((sstream() << "failed to delete '" << olean_fn << "': " << GetLastError()).str());
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}
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}
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#endif
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return io_result_mk_error((sstream() << "failed to write '" << olean_fn << "': " << errno << " " << strerror(errno)).str());
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}
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return io_result_mk_ok(box(0));
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} catch (exception & ex) {
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return io_result_mk_error((sstream() << "failed to write '" << olean_fn << "': " << ex.what()).str());
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}
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}
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extern "C" LEAN_EXPORT object * lean_read_module_data(object * fname, object *) {
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std::string olean_fn(string_cstr(fname));
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try {
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std::ifstream in(olean_fn, std::ios_base::binary);
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if (in.fail()) {
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return io_result_mk_error((sstream() << "failed to open file '" << olean_fn << "'").str());
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}
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/* Get file size */
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in.seekg(0, in.end);
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size_t size = in.tellg();
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in.seekg(0);
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size_t header_size = strlen(g_olean_header);
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if (size < header_size) {
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return io_result_mk_error((sstream() << "failed to read file '" << olean_fn << "', invalid header").str());
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}
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char * header = new char[header_size];
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in.read(header, header_size);
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if (strncmp(header, g_olean_header, header_size) != 0) {
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return io_result_mk_error((sstream() << "failed to read file '" << olean_fn << "', invalid header").str());
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}
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delete[] header;
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char * base_addr;
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in.read(reinterpret_cast<char *>(&base_addr), sizeof(base_addr));
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header_size += sizeof(base_addr);
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char * buffer = nullptr;
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bool is_mmap = false;
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std::function<void()> free_data;
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#ifdef LEAN_WINDOWS
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// `FILE_SHARE_DELETE` is necessary to allow the file to (be marked to) be deleted while in use
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HANDLE h_olean_fn = CreateFile(olean_fn.c_str(), GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_DELETE, NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
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if (h_olean_fn == INVALID_HANDLE_VALUE) {
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return io_result_mk_error((sstream() << "failed to open '" << olean_fn << "': " << GetLastError()).str());
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}
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HANDLE h_map = CreateFileMapping(h_olean_fn, NULL, PAGE_READONLY, 0, 0, NULL);
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if (h_olean_fn == NULL) {
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return io_result_mk_error((sstream() << "failed to map '" << olean_fn << "': " << GetLastError()).str());
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}
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buffer = static_cast<char *>(MapViewOfFileEx(h_map, FILE_MAP_READ, 0, 0, 0, base_addr));
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free_data = [=]() {
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if (buffer) {
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lean_always_assert(UnmapViewOfFile(base_addr));
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}
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lean_always_assert(CloseHandle(h_map));
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lean_always_assert(CloseHandle(h_olean_fn));
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};
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#else
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int fd = open(olean_fn.c_str(), O_RDONLY);
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if (fd == -1) {
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return io_result_mk_error((sstream() << "failed to open '" << olean_fn << "': " << strerror(errno)).str());
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}
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buffer = static_cast<char *>(mmap(base_addr, size, PROT_READ, MAP_PRIVATE, fd, 0));
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close(fd);
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free_data = [=]() {
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if (buffer != MAP_FAILED) {
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lean_always_assert(munmap(buffer, size) == 0);
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}
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};
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#endif
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if (buffer == base_addr) {
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buffer += header_size;
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is_mmap = true;
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} else {
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free_data();
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buffer = static_cast<char *>(malloc(size - header_size));
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free_data = [=]() {
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free(buffer);
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};
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in.read(buffer, size - header_size);
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if (!in) {
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return io_result_mk_error((sstream() << "failed to read file '" << olean_fn << "'").str());
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}
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}
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in.close();
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compacted_region * region = new compacted_region(size - header_size, buffer, base_addr + header_size, is_mmap, free_data);
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#if defined(__has_feature)
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#if __has_feature(address_sanitizer)
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// do not report as leak
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__lsan_ignore_object(region);
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#endif
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#endif
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object * mod = region->read();
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object * mod_region = alloc_cnstr(0, 2, 0);
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cnstr_set(mod_region, 0, mod);
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cnstr_set(mod_region, 1, box_size_t(reinterpret_cast<size_t>(region)));
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return io_result_mk_ok(mod_region);
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} catch (exception & ex) {
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return io_result_mk_error((sstream() << "failed to read '" << olean_fn << "': " << ex.what()).str());
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}
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}
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/*
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@[export lean.write_module_core]
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def writeModule (env : Environment) (fname : String) : IO Unit := */
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extern "C" object * lean_write_module(object * env, object * fname, object *);
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void write_module(environment const & env, std::string const & olean_fn) {
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consume_io_result(lean_write_module(env.to_obj_arg(), mk_string(olean_fn), io_mk_world()));
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}
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}
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