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https://github.com/isar/libmdbx.git
synced 2025-10-31 03:29:01 +08:00
mdbx++: Add support for C++17 polymorphic allocators.
Change-Id: I76054829551c247a4d8f81288fc47db47ead0288
This commit is contained in:
Leonid Yuriev
223
src/mdbx.c++
223
src/mdbx.c++
@@ -25,7 +25,6 @@
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#include "internals.h"
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#include <atomic>
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#include <sstream>
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#include <system_error>
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#if defined(__has_include) && __has_include(<version>)
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@@ -150,10 +149,11 @@ __cold std::string format_va(const char *fmt, va_list ap) {
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#endif
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assert(needed >= 0);
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std::string result;
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result.reserve((size_t)needed + 1);
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result.resize((size_t)needed, '\0');
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assert((int)result.capacity() > needed);
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int actual = vsnprintf((char *)result.data(), result.capacity(), fmt, ones);
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result.reserve(size_t(needed + 1));
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result.resize(size_t(needed), '\0');
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assert(int(result.capacity()) > needed);
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int actual = vsnprintf(const_cast<char *>(result.data()), result.capacity(),
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fmt, ones);
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assert(actual == needed);
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(void)actual;
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va_end(ones);
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@@ -275,6 +275,10 @@ namespace mdbx {
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"mdbx:: exceeded the maximal length of data/slice/buffer");
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}
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[[noreturn]] __cold void throw_too_small_target_buffer() {
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throw std::length_error("mdbx:: the target buffer is too small");
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}
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__cold exception::exception(const error &error) noexcept
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: base(error.what()), error_(error) {}
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@@ -430,6 +434,61 @@ __cold void error::throw_exception() const {
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//------------------------------------------------------------------------------
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char *slice::to_hex(char *dst, size_t dst_size, bool uppercase) const {
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if (mdbx_unlikely((dst_size >> 1) < length()))
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throw_too_small_target_buffer();
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auto src = byte_ptr();
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const auto end = src + length();
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const char x0A = (uppercase ? 'A' : 'a') - 10;
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while (src != end) {
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const char high = *src >> 4;
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const char low = *src & 15;
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dst[0] = (high < 10) ? high + '0' : high + x0A;
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dst[1] = (low < 10) ? low + '0' : low + x0A;
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src += 1;
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dst += 2;
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}
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return dst;
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}
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char *slice::from_hex(char *dest, size_t dest_size) const {
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if (length() % 2)
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throw std::invalid_argument(
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"mdbx::from_hex:: odd length of hexadecimal string");
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(void)dest;
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(void)dest_size;
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NOT_IMPLEMENTED();
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return nullptr;
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}
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char *slice::to_base58(char *dest, size_t dest_size) const {
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(void)dest;
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(void)dest_size;
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NOT_IMPLEMENTED();
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return nullptr;
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}
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char *slice::from_base58(char *dest, size_t dest_size) const {
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(void)dest;
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(void)dest_size;
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NOT_IMPLEMENTED();
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return nullptr;
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}
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char *slice::to_base64(char *dest, size_t dest_size) const {
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(void)dest;
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(void)dest_size;
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NOT_IMPLEMENTED();
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return nullptr;
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}
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char *slice::from_base64(char *dest, size_t dest_size) const {
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(void)dest;
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(void)dest_size;
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NOT_IMPLEMENTED();
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return nullptr;
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}
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bool slice::is_base64() const noexcept {
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NOT_IMPLEMENTED();
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return true;
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@@ -445,149 +504,13 @@ bool slice::is_printable(bool allow_utf8) const noexcept {
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return allow_utf8;
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}
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std::string slice::hex_string(bool uppercase) const {
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std::string result;
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if (length() > 0) {
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result.reserve(length() * 2);
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const uint8_t *ptr = static_cast<const uint8_t *>(data());
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const uint8_t *const end = ptr + length();
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const char x0A = (uppercase ? 'A' : 'a') - 10;
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do {
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char high = *ptr >> 4;
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char low = *ptr & 15;
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result.push_back((high < 10) ? high + '0' : high + x0A);
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result.push_back((low < 10) ? low + '0' : low + x0A);
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} while (++ptr < end);
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}
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return result;
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}
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std::string slice::base64_string() const {
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std::string result;
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NOT_IMPLEMENTED();
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return result;
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}
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//------------------------------------------------------------------------------
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void buffer::reserve(size_t head_room, size_t tail_room) {
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if (unlikely(head_room > max_length || tail_room > max_length ||
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head_room + tail_room > max_length - slice_.length()))
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throw_max_length_exceeded();
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template class LIBMDBX_API_TYPE buffer<default_allocator>;
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const size_t whole = head_room + slice_.length() + tail_room;
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if (whole == 0)
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silo_.clear();
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else if (is_reference() || slice_.empty()) {
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silo_.reserve(whole);
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silo_.append(head_room, '\0');
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silo_.append(slice_.char_ptr(), slice_.length());
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} else {
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std::string buffer;
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buffer.reserve(whole);
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buffer.append(head_room, '\0');
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buffer.append(slice_.char_ptr(), slice_.length());
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silo_.assign(std::move(buffer));
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}
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slice_.iov_base = const_cast<char *>(silo_.data());
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}
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void buffer::insulate() {
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assert(is_reference());
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silo_.assign(slice_.char_ptr(), slice_.length());
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slice_.iov_base = const_cast<char *>(silo_.data());
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}
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buffer &buffer::assign_reference(const void *ptr, size_t bytes) noexcept {
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silo_.clear();
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slice_.assign(ptr, bytes);
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return *this;
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}
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buffer &buffer::assign_freestanding(const void *ptr, size_t bytes) {
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silo_.assign(static_cast<const char *>(ptr), check_length(bytes));
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slice_.assign(silo_);
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return *this;
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}
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void buffer::clear() noexcept {
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slice_.reset();
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silo_.clear();
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}
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void buffer::shrink_to_fit() {
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if (silo_.capacity() != length()) {
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if (silo_.length() != length())
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silo_.assign(char_ptr(), length());
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silo_.shrink_to_fit();
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slice_.assign(silo_);
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}
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}
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void buffer::shrink() {
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if (silo_.length() != length()) {
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silo_.assign(char_ptr(), length());
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slice_.assign(silo_);
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}
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}
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int buffer::thunk::cb_copy(void *context, MDBX_val *target, const void *src,
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size_t bytes) noexcept {
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thunk *self = static_cast<thunk *>(context);
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assert(self->is_clean());
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try {
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owner_of(static_cast<slice *>(target), &buffer::slice_)
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->assign(src, bytes, false);
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return MDBX_RESULT_FALSE;
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} catch (... /* capture any exception to rethrow it over C code */) {
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self->capture();
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return MDBX_RESULT_TRUE;
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}
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}
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buffer::buffer(size_t head_room, size_t tail_room) {
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if (unlikely(head_room > max_length || tail_room > max_length ||
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head_room + tail_room > max_length))
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throw_max_length_exceeded();
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silo_.reserve(head_room + tail_room);
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silo_.append(head_room, '\0');
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slice_.iov_base = const_cast<char *>(silo_.data());
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assert(slice_.iov_len == 0);
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}
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buffer::buffer(size_t head_room, const slice &src, size_t tail_room) {
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if (unlikely(head_room > max_length || tail_room > max_length ||
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head_room + tail_room > max_length - slice_.length()))
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throw_max_length_exceeded();
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silo_.reserve(head_room + src.length() + tail_room);
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silo_.append(head_room, '\0');
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silo_.append(src.char_ptr(), src.length());
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slice_.iov_base = const_cast<char *>(silo_.data());
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slice_.iov_len = src.length();
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}
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buffer::buffer(size_t capacity) {
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silo_.reserve(check_length(capacity));
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slice_.iov_base = const_cast<char *>(silo_.data());
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assert(slice_.iov_len == 0);
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}
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buffer::buffer(const txn_ref &txn, const slice &src)
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: buffer(src, !txn.is_dirty(src.data())) {}
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buffer buffer::decode_hex(const slice &hex) {
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if (hex.length() % 2)
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throw std::invalid_argument("odd length of hexadecimal string");
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buffer result(hex.length() / 2);
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NOT_IMPLEMENTED();
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return result;
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}
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buffer buffer::decode_base64(const slice &base64) {
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buffer result(base64.length() * 4 / 3);
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NOT_IMPLEMENTED();
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return result;
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}
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#if defined(__cpp_lib_memory_resource) && __cpp_lib_memory_resource >= 201603L
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template class LIBMDBX_API_TYPE buffer<polymorphic_allocator>;
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#endif /* __cpp_lib_memory_resource >= 201603L */
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//------------------------------------------------------------------------------
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@@ -858,10 +781,6 @@ __cold ::std::ostream &operator<<(::std::ostream &, const pair &) {
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NOT_IMPLEMENTED();
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}
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__cold ::std::ostream &operator<<(::std::ostream &, const buffer &) {
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NOT_IMPLEMENTED();
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}
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__cold ::std::ostream &operator<<(::std::ostream &, const env_ref::geometry &) {
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NOT_IMPLEMENTED();
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}
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@@ -954,12 +873,6 @@ __cold string to_string(const ::mdbx::pair &value) {
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return out.str();
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}
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__cold string to_string(const ::mdbx::buffer &value) {
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ostringstream out;
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out << value;
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return out.str();
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}
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__cold string to_string(const ::mdbx::env_ref::geometry &value) {
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ostringstream out;
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out << value;
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