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Optimize for size on buffers_cat preconditions:

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When BOOST_BEAST_TESTS is not defined, violations of
buffers_cat preconditions will assert instead of throwing
exceptions. This reduces the size of the emitted code
and improves performance.
This commit is contained in:
Vinnie Falco
2018-12-15 12:51:34 -08:00
parent fa14af2696
commit 9d27f2659f
6 changed files with 63 additions and 31 deletions
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include/boost/beast/core/impl/buffers_cat.hpp
+51 -23
View File
@@ -14,7 +14,6 @@
#include <boost/beast/core/detail/type_traits.hpp>
#include <boost/beast/core/detail/variant.hpp>
#include <boost/asio/buffer.hpp>
#include <boost/throw_exception.hpp>
#include <cstdint>
#include <iterator>
#include <new>
@@ -24,6 +23,45 @@
namespace boost {
namespace beast {
#if defined(_MSC_VER) && ! defined(__clang__)
# define BOOST_BEAST_UNREACHABLE() __assume(false)
# define BOOST_BEAST_UNREACHABLE_RETURN(v) __assume(false)
#else
# define BOOST_BEAST_UNREACHABLE() __builtin_unreachable()
# define BOOST_BEAST_UNREACHABLE_RETURN(v) \
do { __builtin_unreachable(); return v; } while(false)
#endif
#ifdef BOOST_BEAST_TESTS
#define BOOST_BEAST_LOGIC_ERROR(s) \
do { \
BOOST_THROW_EXCEPTION(std::logic_error((s))); \
BOOST_BEAST_UNREACHABLE(); \
} while(false)
#define BOOST_BEAST_LOGIC_ERROR_RETURN(v, s) \
do { \
BOOST_THROW_EXCEPTION(std::logic_error(s)); \
BOOST_BEAST_UNREACHABLE_RETURN(v); \
} while(false)
#else
#define BOOST_BEAST_LOGIC_ERROR(s) \
do { \
BOOST_ASSERT_MSG(false, s); \
BOOST_BEAST_UNREACHABLE(); \
} while(false)
#define BOOST_BEAST_LOGIC_ERROR_RETURN(v, s) \
do { \
BOOST_ASSERT_MSG(false, (s)); \
BOOST_BEAST_UNREACHABLE_RETURN(v); \
} while(false)
#endif
namespace detail {
struct buffers_cat_view_iterator_base
@@ -35,9 +73,8 @@ struct buffers_cat_view_iterator_base
net::mutable_buffer
operator*() const
{
// Dereferencing a one-past-the-end iterator
BOOST_THROW_EXCEPTION(std::logic_error{
"invalid iterator"});
BOOST_BEAST_LOGIC_ERROR_RETURN({},
"Dereferencing a one-past-the-end iterator");
}
operator bool() const noexcept
@@ -115,13 +152,11 @@ private:
{
const_iterator const& self;
[[noreturn]]
reference
operator()(mp11::mp_size_t<0>)
{
// Dereferencing a default-constructed iterator
BOOST_THROW_EXCEPTION(std::logic_error{
"invalid iterator"});
BOOST_BEAST_LOGIC_ERROR_RETURN({},
"Dereferencing a default-constructed iterator");
}
template<class I>
@@ -135,13 +170,11 @@ private:
{
const_iterator& self;
[[noreturn]]
void
operator()(mp11::mp_size_t<0>)
{
// Incrementing a default-constructed iterator
BOOST_THROW_EXCEPTION(std::logic_error{
"invalid iterator"});
BOOST_BEAST_LOGIC_ERROR(
"Incrementing a default-constructed iterator");
}
template<std::size_t I>
@@ -198,13 +231,11 @@ private:
self.it_.template emplace<I+1>();
}
[[noreturn]]
void
operator()(mp11::mp_size_t<sizeof...(Bn)+1>)
{
// Incrementing a one-past-the-end iterator
BOOST_THROW_EXCEPTION(std::logic_error{
"invalid iterator"});
BOOST_BEAST_LOGIC_ERROR(
"Incrementing a one-past-the-end iterator");
}
};
@@ -212,13 +243,11 @@ private:
{
const_iterator& self;
[[noreturn]]
void
operator()(mp11::mp_size_t<0>)
{
// Decrementing a default-constructed iterator
BOOST_THROW_EXCEPTION(std::logic_error{
"invalid iterator"});
BOOST_BEAST_LOGIC_ERROR(
"Decrementing a default-constructed iterator");
}
void
@@ -232,9 +261,8 @@ private:
if(it == net::buffer_sequence_begin(
detail::get<I-1>(*self.bn_)))
{
// Decrementing an iterator to the beginning
BOOST_THROW_EXCEPTION(std::logic_error{
"invalid iterator"});
BOOST_BEAST_LOGIC_ERROR(
"Decrementing an iterator to the beginning");
}
--it;
if(net::const_buffer(*it).size() > 0)