mirror of
https://git.suyu.dev/suyu/ext-boost.git
synced 2026-01-05 05:58:13 +01:00
externals: Update boost to 1.72 and add Boost Context
This commit is contained in:
Fernando Sahmkow
parent
5e8300b76a
commit
77abe07b3b
618 changed files with 96299 additions and 14263 deletions
373
boost/context/continuation_fcontext.hpp
Normal file
373
boost/context/continuation_fcontext.hpp
Normal file
|
|
@ -0,0 +1,373 @@
|
|||
|
||||
// Copyright Oliver Kowalke 2017.
|
||||
// Distributed under the Boost Software License, Version 1.0.
|
||||
// (See accompanying file LICENSE_1_0.txt or copy at
|
||||
// http://www.boost.org/LICENSE_1_0.txt)
|
||||
|
||||
#ifndef BOOST_CONTEXT_CONTINUATION_H
|
||||
#define BOOST_CONTEXT_CONTINUATION_H
|
||||
|
||||
#include <boost/context/detail/config.hpp>
|
||||
|
||||
#include <algorithm>
|
||||
#include <cstddef>
|
||||
#include <cstdint>
|
||||
#include <cstdlib>
|
||||
#include <exception>
|
||||
#include <functional>
|
||||
#include <memory>
|
||||
#include <ostream>
|
||||
#include <tuple>
|
||||
#include <utility>
|
||||
|
||||
#include <boost/assert.hpp>
|
||||
#include <boost/config.hpp>
|
||||
#include <boost/intrusive_ptr.hpp>
|
||||
|
||||
#if defined(BOOST_NO_CXX14_STD_EXCHANGE)
|
||||
#include <boost/context/detail/exchange.hpp>
|
||||
#endif
|
||||
#if defined(BOOST_NO_CXX17_STD_INVOKE)
|
||||
#include <boost/context/detail/invoke.hpp>
|
||||
#endif
|
||||
#include <boost/context/detail/disable_overload.hpp>
|
||||
#include <boost/context/detail/exception.hpp>
|
||||
#include <boost/context/detail/fcontext.hpp>
|
||||
#include <boost/context/detail/tuple.hpp>
|
||||
#include <boost/context/fixedsize_stack.hpp>
|
||||
#include <boost/context/flags.hpp>
|
||||
#include <boost/context/preallocated.hpp>
|
||||
#include <boost/context/segmented_stack.hpp>
|
||||
#include <boost/context/stack_context.hpp>
|
||||
|
||||
#ifdef BOOST_HAS_ABI_HEADERS
|
||||
# include BOOST_ABI_PREFIX
|
||||
#endif
|
||||
|
||||
#if defined(BOOST_MSVC)
|
||||
# pragma warning(push)
|
||||
# pragma warning(disable: 4702)
|
||||
#endif
|
||||
|
||||
namespace boost {
|
||||
namespace context {
|
||||
namespace detail {
|
||||
|
||||
inline
|
||||
transfer_t context_unwind( transfer_t t) {
|
||||
throw forced_unwind( t.fctx);
|
||||
return { nullptr, nullptr };
|
||||
}
|
||||
|
||||
template< typename Rec >
|
||||
transfer_t context_exit( transfer_t t) noexcept {
|
||||
Rec * rec = static_cast< Rec * >( t.data);
|
||||
// destroy context stack
|
||||
rec->deallocate();
|
||||
return { nullptr, nullptr };
|
||||
}
|
||||
|
||||
template< typename Rec >
|
||||
void context_entry( transfer_t t) noexcept {
|
||||
// transfer control structure to the context-stack
|
||||
Rec * rec = static_cast< Rec * >( t.data);
|
||||
BOOST_ASSERT( nullptr != t.fctx);
|
||||
BOOST_ASSERT( nullptr != rec);
|
||||
try {
|
||||
// jump back to `create_context()`
|
||||
t = jump_fcontext( t.fctx, nullptr);
|
||||
// start executing
|
||||
t.fctx = rec->run( t.fctx);
|
||||
} catch ( forced_unwind const& ex) {
|
||||
t = { ex.fctx, nullptr };
|
||||
#ifndef BOOST_ASSERT_IS_VOID
|
||||
const_cast< forced_unwind & >( ex).caught = true;
|
||||
#endif
|
||||
}
|
||||
BOOST_ASSERT( nullptr != t.fctx);
|
||||
// destroy context-stack of `this`context on next context
|
||||
ontop_fcontext( t.fctx, rec, context_exit< Rec >);
|
||||
BOOST_ASSERT_MSG( false, "context already terminated");
|
||||
}
|
||||
|
||||
template< typename Ctx, typename Fn >
|
||||
transfer_t context_ontop( transfer_t t) {
|
||||
auto p = static_cast< std::tuple< Fn > * >( t.data);
|
||||
BOOST_ASSERT( nullptr != p);
|
||||
typename std::decay< Fn >::type fn = std::get< 0 >( * p);
|
||||
t.data = nullptr;
|
||||
Ctx c{ t.fctx };
|
||||
// execute function, pass continuation via reference
|
||||
c = fn( std::move( c) );
|
||||
#if defined(BOOST_NO_CXX14_STD_EXCHANGE)
|
||||
return { exchange( c.fctx_, nullptr), nullptr };
|
||||
#else
|
||||
return { std::exchange( c.fctx_, nullptr), nullptr };
|
||||
#endif
|
||||
}
|
||||
|
||||
template< typename Ctx, typename StackAlloc, typename Fn >
|
||||
class record {
|
||||
private:
|
||||
stack_context sctx_;
|
||||
typename std::decay< StackAlloc >::type salloc_;
|
||||
typename std::decay< Fn >::type fn_;
|
||||
|
||||
static void destroy( record * p) noexcept {
|
||||
typename std::decay< StackAlloc >::type salloc = std::move( p->salloc_);
|
||||
stack_context sctx = p->sctx_;
|
||||
// deallocate record
|
||||
p->~record();
|
||||
// destroy stack with stack allocator
|
||||
salloc.deallocate( sctx);
|
||||
}
|
||||
|
||||
public:
|
||||
record( stack_context sctx, StackAlloc && salloc,
|
||||
Fn && fn) noexcept :
|
||||
sctx_( sctx),
|
||||
salloc_( std::forward< StackAlloc >( salloc)),
|
||||
fn_( std::forward< Fn >( fn) ) {
|
||||
}
|
||||
|
||||
record( record const&) = delete;
|
||||
record & operator=( record const&) = delete;
|
||||
|
||||
void deallocate() noexcept {
|
||||
destroy( this);
|
||||
}
|
||||
|
||||
fcontext_t run( fcontext_t fctx) {
|
||||
Ctx c{ fctx };
|
||||
// invoke context-function
|
||||
#if defined(BOOST_NO_CXX17_STD_INVOKE)
|
||||
c = boost::context::detail::invoke( fn_, std::move( c) );
|
||||
#else
|
||||
c = std::invoke( fn_, std::move( c) );
|
||||
#endif
|
||||
#if defined(BOOST_NO_CXX14_STD_EXCHANGE)
|
||||
return exchange( c.fctx_, nullptr);
|
||||
#else
|
||||
return std::exchange( c.fctx_, nullptr);
|
||||
#endif
|
||||
}
|
||||
};
|
||||
|
||||
template< typename Record, typename StackAlloc, typename Fn >
|
||||
fcontext_t create_context1( StackAlloc && salloc, Fn && fn) {
|
||||
auto sctx = salloc.allocate();
|
||||
// reserve space for control structure
|
||||
void * storage = reinterpret_cast< void * >(
|
||||
( reinterpret_cast< uintptr_t >( sctx.sp) - static_cast< uintptr_t >( sizeof( Record) ) )
|
||||
& ~static_cast< uintptr_t >( 0xff) );
|
||||
// placment new for control structure on context stack
|
||||
Record * record = new ( storage) Record{
|
||||
sctx, std::forward< StackAlloc >( salloc), std::forward< Fn >( fn) };
|
||||
// 64byte gab between control structure and stack top
|
||||
// should be 16byte aligned
|
||||
void * stack_top = reinterpret_cast< void * >(
|
||||
reinterpret_cast< uintptr_t >( storage) - static_cast< uintptr_t >( 64) );
|
||||
void * stack_bottom = reinterpret_cast< void * >(
|
||||
reinterpret_cast< uintptr_t >( sctx.sp) - static_cast< uintptr_t >( sctx.size) );
|
||||
// create fast-context
|
||||
const std::size_t size = reinterpret_cast< uintptr_t >( stack_top) - reinterpret_cast< uintptr_t >( stack_bottom);
|
||||
const fcontext_t fctx = make_fcontext( stack_top, size, & context_entry< Record >);
|
||||
BOOST_ASSERT( nullptr != fctx);
|
||||
// transfer control structure to context-stack
|
||||
return jump_fcontext( fctx, record).fctx;
|
||||
}
|
||||
|
||||
template< typename Record, typename StackAlloc, typename Fn >
|
||||
fcontext_t create_context2( preallocated palloc, StackAlloc && salloc, Fn && fn) {
|
||||
// reserve space for control structure
|
||||
void * storage = reinterpret_cast< void * >(
|
||||
( reinterpret_cast< uintptr_t >( palloc.sp) - static_cast< uintptr_t >( sizeof( Record) ) )
|
||||
& ~ static_cast< uintptr_t >( 0xff) );
|
||||
// placment new for control structure on context-stack
|
||||
Record * record = new ( storage) Record{
|
||||
palloc.sctx, std::forward< StackAlloc >( salloc), std::forward< Fn >( fn) };
|
||||
// 64byte gab between control structure and stack top
|
||||
void * stack_top = reinterpret_cast< void * >(
|
||||
reinterpret_cast< uintptr_t >( storage) - static_cast< uintptr_t >( 64) );
|
||||
void * stack_bottom = reinterpret_cast< void * >(
|
||||
reinterpret_cast< uintptr_t >( palloc.sctx.sp) - static_cast< uintptr_t >( palloc.sctx.size) );
|
||||
// create fast-context
|
||||
const std::size_t size = reinterpret_cast< uintptr_t >( stack_top) - reinterpret_cast< uintptr_t >( stack_bottom);
|
||||
const fcontext_t fctx = make_fcontext( stack_top, size, & context_entry< Record >);
|
||||
BOOST_ASSERT( nullptr != fctx);
|
||||
// transfer control structure to context-stack
|
||||
return jump_fcontext( fctx, record).fctx;
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
class continuation {
|
||||
private:
|
||||
template< typename Ctx, typename StackAlloc, typename Fn >
|
||||
friend class detail::record;
|
||||
|
||||
template< typename Ctx, typename Fn >
|
||||
friend detail::transfer_t
|
||||
detail::context_ontop( detail::transfer_t);
|
||||
|
||||
template< typename StackAlloc, typename Fn >
|
||||
friend continuation
|
||||
callcc( std::allocator_arg_t, StackAlloc &&, Fn &&);
|
||||
|
||||
template< typename StackAlloc, typename Fn >
|
||||
friend continuation
|
||||
callcc( std::allocator_arg_t, preallocated, StackAlloc &&, Fn &&);
|
||||
|
||||
detail::fcontext_t fctx_{ nullptr };
|
||||
|
||||
continuation( detail::fcontext_t fctx) noexcept :
|
||||
fctx_{ fctx } {
|
||||
}
|
||||
|
||||
public:
|
||||
continuation() noexcept = default;
|
||||
|
||||
~continuation() {
|
||||
if ( BOOST_UNLIKELY( nullptr != fctx_) ) {
|
||||
detail::ontop_fcontext(
|
||||
#if defined(BOOST_NO_CXX14_STD_EXCHANGE)
|
||||
detail::exchange( fctx_, nullptr),
|
||||
#else
|
||||
std::exchange( fctx_, nullptr),
|
||||
#endif
|
||||
nullptr,
|
||||
detail::context_unwind);
|
||||
}
|
||||
}
|
||||
|
||||
continuation( continuation && other) noexcept {
|
||||
swap( other);
|
||||
}
|
||||
|
||||
continuation & operator=( continuation && other) noexcept {
|
||||
if ( BOOST_LIKELY( this != & other) ) {
|
||||
continuation tmp = std::move( other);
|
||||
swap( tmp);
|
||||
}
|
||||
return * this;
|
||||
}
|
||||
|
||||
continuation( continuation const& other) noexcept = delete;
|
||||
continuation & operator=( continuation const& other) noexcept = delete;
|
||||
|
||||
continuation resume() & {
|
||||
return std::move( * this).resume();
|
||||
}
|
||||
|
||||
continuation resume() && {
|
||||
BOOST_ASSERT( nullptr != fctx_);
|
||||
return { detail::jump_fcontext(
|
||||
#if defined(BOOST_NO_CXX14_STD_EXCHANGE)
|
||||
detail::exchange( fctx_, nullptr),
|
||||
#else
|
||||
std::exchange( fctx_, nullptr),
|
||||
#endif
|
||||
nullptr).fctx };
|
||||
}
|
||||
|
||||
template< typename Fn >
|
||||
continuation resume_with( Fn && fn) & {
|
||||
return std::move( * this).resume_with( std::forward< Fn >( fn) );
|
||||
}
|
||||
|
||||
template< typename Fn >
|
||||
continuation resume_with( Fn && fn) && {
|
||||
BOOST_ASSERT( nullptr != fctx_);
|
||||
auto p = std::make_tuple( std::forward< Fn >( fn) );
|
||||
return { detail::ontop_fcontext(
|
||||
#if defined(BOOST_NO_CXX14_STD_EXCHANGE)
|
||||
detail::exchange( fctx_, nullptr),
|
||||
#else
|
||||
std::exchange( fctx_, nullptr),
|
||||
#endif
|
||||
& p,
|
||||
detail::context_ontop< continuation, Fn >).fctx };
|
||||
}
|
||||
|
||||
explicit operator bool() const noexcept {
|
||||
return nullptr != fctx_;
|
||||
}
|
||||
|
||||
bool operator!() const noexcept {
|
||||
return nullptr == fctx_;
|
||||
}
|
||||
|
||||
bool operator<( continuation const& other) const noexcept {
|
||||
return fctx_ < other.fctx_;
|
||||
}
|
||||
|
||||
template< typename charT, class traitsT >
|
||||
friend std::basic_ostream< charT, traitsT > &
|
||||
operator<<( std::basic_ostream< charT, traitsT > & os, continuation const& other) {
|
||||
if ( nullptr != other.fctx_) {
|
||||
return os << other.fctx_;
|
||||
} else {
|
||||
return os << "{not-a-context}";
|
||||
}
|
||||
}
|
||||
|
||||
void swap( continuation & other) noexcept {
|
||||
std::swap( fctx_, other.fctx_);
|
||||
}
|
||||
};
|
||||
|
||||
template<
|
||||
typename Fn,
|
||||
typename = detail::disable_overload< continuation, Fn >
|
||||
>
|
||||
continuation
|
||||
callcc( Fn && fn) {
|
||||
return callcc(
|
||||
std::allocator_arg, fixedsize_stack(),
|
||||
std::forward< Fn >( fn) );
|
||||
}
|
||||
|
||||
template< typename StackAlloc, typename Fn >
|
||||
continuation
|
||||
callcc( std::allocator_arg_t, StackAlloc && salloc, Fn && fn) {
|
||||
using Record = detail::record< continuation, StackAlloc, Fn >;
|
||||
return continuation{
|
||||
detail::create_context1< Record >(
|
||||
std::forward< StackAlloc >( salloc), std::forward< Fn >( fn) ) }.resume();
|
||||
}
|
||||
|
||||
template< typename StackAlloc, typename Fn >
|
||||
continuation
|
||||
callcc( std::allocator_arg_t, preallocated palloc, StackAlloc && salloc, Fn && fn) {
|
||||
using Record = detail::record< continuation, StackAlloc, Fn >;
|
||||
return continuation{
|
||||
detail::create_context2< Record >(
|
||||
palloc, std::forward< StackAlloc >( salloc), std::forward< Fn >( fn) ) }.resume();
|
||||
}
|
||||
|
||||
#if defined(BOOST_USE_SEGMENTED_STACKS)
|
||||
template< typename Fn >
|
||||
continuation
|
||||
callcc( std::allocator_arg_t, segmented_stack, Fn &&);
|
||||
|
||||
template< typename StackAlloc, typename Fn >
|
||||
continuation
|
||||
callcc( std::allocator_arg_t, preallocated, segmented_stack, Fn &&);
|
||||
#endif
|
||||
|
||||
inline
|
||||
void swap( continuation & l, continuation & r) noexcept {
|
||||
l.swap( r);
|
||||
}
|
||||
|
||||
}}
|
||||
|
||||
#if defined(BOOST_MSVC)
|
||||
# pragma warning(pop)
|
||||
#endif
|
||||
|
||||
#ifdef BOOST_HAS_ABI_HEADERS
|
||||
# include BOOST_ABI_SUFFIX
|
||||
#endif
|
||||
|
||||
#endif // BOOST_CONTEXT_CONTINUATION_H
|
||||
Loading…
Add table
Add a link
Reference in a new issue