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-rw-r--r--boost/context/all.hpp14
-rw-r--r--boost/context/detail/config.hpp42
-rw-r--r--boost/context/detail/fcontext_arm.hpp66
-rw-r--r--boost/context/detail/fcontext_i386.hpp68
-rw-r--r--boost/context/detail/fcontext_i386_win.hpp83
-rw-r--r--boost/context/detail/fcontext_mips.hpp68
-rw-r--r--boost/context/detail/fcontext_ppc.hpp70
-rw-r--r--boost/context/detail/fcontext_x86_64.hpp66
-rw-r--r--boost/context/detail/fcontext_x86_64_win.hpp90
-rw-r--r--boost/context/fcontext.hpp82
-rw-r--r--boost/context/stack_allocator.hpp37
-rw-r--r--boost/context/stack_utils.hpp41
12 files changed, 727 insertions, 0 deletions
diff --git a/boost/context/all.hpp b/boost/context/all.hpp
new file mode 100644
index 0000000000..f9a4c71dbf
--- /dev/null
+++ b/boost/context/all.hpp
@@ -0,0 +1,14 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_ALL_H
+#define BOOST_CTX_ALL_H
+
+#include <boost/context/fcontext.hpp>
+#include <boost/context/stack_allocator.hpp>
+#include <boost/context/stack_utils.hpp>
+
+#endif // BOOST_CTX_ALL_H
diff --git a/boost/context/detail/config.hpp b/boost/context/detail/config.hpp
new file mode 100644
index 0000000000..50ada3c507
--- /dev/null
+++ b/boost/context/detail/config.hpp
@@ -0,0 +1,42 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_DETAIL_CONFIG_H
+#define BOOST_CTX_DETAIL_CONFIG_H
+
+#include <boost/config.hpp>
+#include <boost/detail/workaround.hpp>
+
+#ifdef BOOST_CONTEXT_DECL
+# undef BOOST_CONTEXT_DECL
+#endif
+
+#if defined(BOOST_HAS_DECLSPEC)
+# if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_CONTEXT_DYN_LINK)
+# if ! defined(BOOST_DYN_LINK)
+# define BOOST_DYN_LINK
+# endif
+# if defined(BOOST_CONTEXT_SOURCE)
+# define BOOST_CONTEXT_DECL BOOST_SYMBOL_EXPORT
+# else
+# define BOOST_CONTEXT_DECL BOOST_SYMBOL_IMPORT
+# endif
+# endif
+#endif
+
+#if ! defined(BOOST_CONTEXT_DECL)
+# define BOOST_CONTEXT_DECL
+#endif
+
+#if ! defined(BOOST_CONTEXT_SOURCE) && ! defined(BOOST_ALL_NO_LIB) && ! defined(BOOST_CONTEXT_NO_LIB)
+# define BOOST_LIB_NAME boost_context
+# if defined(BOOST_ALL_DYN_LINK) || defined(BOOST_CONTEXT_DYN_LINK)
+# define BOOST_DYN_LINK
+# endif
+# include <boost/config/auto_link.hpp>
+#endif
+
+#endif // BOOST_CTX_DETAIL_CONFIG_H
diff --git a/boost/context/detail/fcontext_arm.hpp b/boost/context/detail/fcontext_arm.hpp
new file mode 100644
index 0000000000..b4ed2fa264
--- /dev/null
+++ b/boost/context/detail/fcontext_arm.hpp
@@ -0,0 +1,66 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_DETAIL_FCONTEXT_ARM_H
+#define BOOST_CTX_DETAIL_FCONTEXT_ARM_H
+
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+extern "C" {
+
+#define BOOST_CONTEXT_CALLDECL
+
+struct stack_t
+{
+ void * base;
+ void * limit;
+
+ stack_t() :
+ base( 0), limit( 0)
+ {}
+};
+
+struct fp_t
+{
+ boost::uint32_t fc_freg[16];
+
+ fp_t() :
+ fc_freg()
+ {}
+};
+
+struct fcontext_t
+{
+ boost::uint32_t fc_greg[11];
+ stack_t fc_stack;
+ fp_t fc_fp;
+
+ fcontext_t() :
+ fc_greg(),
+ fc_stack(),
+ fc_fp()
+ {}
+};
+
+}
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CTX_DETAIL_FCONTEXT_ARM_H
diff --git a/boost/context/detail/fcontext_i386.hpp b/boost/context/detail/fcontext_i386.hpp
new file mode 100644
index 0000000000..573a22caf3
--- /dev/null
+++ b/boost/context/detail/fcontext_i386.hpp
@@ -0,0 +1,68 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_DETAIL_FCONTEXT_I386H
+#define BOOST_CTX_DETAIL_FCONTEXT_I386H
+
+#include <cstddef>
+
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+extern "C" {
+
+#define BOOST_CONTEXT_CALLDECL __attribute__((cdecl))
+
+struct stack_t
+{
+ void * base;
+ void * limit;
+
+ stack_t() :
+ base( 0), limit( 0)
+ {}
+};
+
+struct fp_t
+{
+ boost::uint32_t fc_freg[2];
+
+ fp_t() :
+ fc_freg()
+ {}
+};
+
+struct fcontext_t
+{
+ boost::uint32_t fc_greg[6];
+ stack_t fc_stack;
+ fp_t fc_fp;
+
+ fcontext_t() :
+ fc_greg(),
+ fc_stack(),
+ fc_fp()
+ {}
+};
+
+}
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CTX_DETAIL_FCONTEXT_I386_H
diff --git a/boost/context/detail/fcontext_i386_win.hpp b/boost/context/detail/fcontext_i386_win.hpp
new file mode 100644
index 0000000000..e250ec5e3b
--- /dev/null
+++ b/boost/context/detail/fcontext_i386_win.hpp
@@ -0,0 +1,83 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_DETAIL_FCONTEXT_I386H
+#define BOOST_CTX_DETAIL_FCONTEXT_I386H
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable:4351)
+#endif
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+extern "C" {
+
+#define BOOST_CONTEXT_CALLDECL __cdecl
+
+struct stack_t
+{
+ void * base;
+ void * limit;
+
+ stack_t() :
+ base( 0), limit( 0)
+ {}
+};
+
+struct fp_t
+{
+ boost::uint32_t fc_freg[2];
+
+ fp_t() :
+ fc_freg()
+ {}
+};
+
+struct fcontext_t
+{
+ boost::uint32_t fc_greg[6];
+ stack_t fc_stack;
+ void * fc_excpt_lst;
+ void * fc_local_storage;
+ fp_t fc_fp;
+
+ fcontext_t() :
+ fc_greg(),
+ fc_stack(),
+ fc_excpt_lst( 0),
+ fc_local_storage( 0),
+ fc_fp()
+ {}
+};
+
+}
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop)
+#endif
+
+#endif // BOOST_CTX_DETAIL_FCONTEXT_I386_H
diff --git a/boost/context/detail/fcontext_mips.hpp b/boost/context/detail/fcontext_mips.hpp
new file mode 100644
index 0000000000..1645adfb8b
--- /dev/null
+++ b/boost/context/detail/fcontext_mips.hpp
@@ -0,0 +1,68 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_DETAIL_FCONTEXT_MIPS_H
+#define BOOST_CTX_DETAIL_FCONTEXT_MIPS_H
+
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+extern "C" {
+
+#define BOOST_CONTEXT_CALLDECL
+
+// on MIPS we assume 64bit regsiters - even for 32bit ABIs
+
+struct stack_t
+{
+ void * base;
+ void * limit;
+
+ stack_t() :
+ base( 0), limit( 0)
+ {}
+};
+
+struct fp_t
+{
+ boost::uint64_t fc_freg[6];
+
+ fp_t() :
+ fc_freg()
+ {}
+};
+
+struct fcontext_t
+{
+ boost::uint64_t fc_greg[13];
+ stack_t fc_stack;
+ fp_t fc_fp;
+
+ fcontext_t() :
+ fc_greg(),
+ fc_stack(),
+ fc_fp()
+ {}
+};
+
+}
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CTX_DETAIL_FCONTEXT_MIPS_H
diff --git a/boost/context/detail/fcontext_ppc.hpp b/boost/context/detail/fcontext_ppc.hpp
new file mode 100644
index 0000000000..5e6c64c555
--- /dev/null
+++ b/boost/context/detail/fcontext_ppc.hpp
@@ -0,0 +1,70 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_DETAIL_FCONTEXT_PPC_H
+#define BOOST_CTX_DETAIL_FCONTEXT_PPC_H
+
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+extern "C" {
+
+#define BOOST_CONTEXT_CALLDECL
+
+struct stack_t
+{
+ void * base;
+ void * limit;
+
+ stack_t() :
+ base( 0), limit( 0)
+ {}
+};
+
+struct fp_t
+{
+ boost::uint64_t fc_freg[19];
+
+ fp_t() :
+ fc_freg()
+ {}
+};
+
+struct fcontext_t
+{
+# if defined(__powerpc64__)
+ boost::uint64_t fc_greg[23];
+# else
+ boost::uint32_t fc_greg[23];
+# endif
+ stack_t fc_stack;
+ fp_t fc_fp;
+
+ fcontext_t() :
+ fc_greg(),
+ fc_stack(),
+ fc_fp()
+ {}
+};
+
+}
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CTX_DETAIL_FCONTEXT_PPC_H
diff --git a/boost/context/detail/fcontext_x86_64.hpp b/boost/context/detail/fcontext_x86_64.hpp
new file mode 100644
index 0000000000..106ee74065
--- /dev/null
+++ b/boost/context/detail/fcontext_x86_64.hpp
@@ -0,0 +1,66 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_DETAIL_FCONTEXT_X86_64_H
+#define BOOST_CTX_DETAIL_FCONTEXT_X86_64_H
+
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+extern "C" {
+
+#define BOOST_CONTEXT_CALLDECL
+
+struct stack_t
+{
+ void * base;
+ void * limit;
+
+ stack_t() :
+ base( 0), limit( 0)
+ {}
+};
+
+struct fp_t
+{
+ boost::uint32_t fc_freg[2];
+
+ fp_t() :
+ fc_freg()
+ {}
+};
+
+struct fcontext_t
+{
+ boost::uint64_t fc_greg[8];
+ stack_t fc_stack;
+ fp_t fc_fp;
+
+ fcontext_t() :
+ fc_greg(),
+ fc_stack(),
+ fc_fp()
+ {}
+};
+
+}
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CTX_DETAIL_FCONTEXT_X86_64_H
diff --git a/boost/context/detail/fcontext_x86_64_win.hpp b/boost/context/detail/fcontext_x86_64_win.hpp
new file mode 100644
index 0000000000..96f153b8e2
--- /dev/null
+++ b/boost/context/detail/fcontext_x86_64_win.hpp
@@ -0,0 +1,90 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_DETAIL_FCONTEXT_X86_64_H
+#define BOOST_CTX_DETAIL_FCONTEXT_X86_64_H
+
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+
+#include <boost/assert.hpp>
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#if defined(BOOST_MSVC)
+#pragma warning(push)
+#pragma warning(disable:4351)
+#endif
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+extern "C" {
+
+#define BOOST_CONTEXT_CALLDECL
+
+struct stack_t
+{
+ void * base;
+ void * limit;
+
+ stack_t() :
+ base( 0), limit( 0)
+ {}
+};
+
+struct fp_t
+{
+ boost::uint32_t fc_freg[2];
+ void * fc_xmm;
+ char fc_buffer[175];
+
+ fp_t() :
+ fc_freg(),
+ fc_xmm( 0),
+ fc_buffer()
+ {
+ fc_xmm = fc_buffer;
+ if ( 0 != ( ( ( uintptr_t) fc_xmm) & 15) )
+ fc_xmm = ( char *) ( ( ( ( uintptr_t) fc_xmm) + 15) & ~0x0F);
+ }
+};
+
+struct fcontext_t
+{
+ boost::uint64_t fc_greg[10];
+ stack_t fc_stack;
+ void * fc_local_storage;
+ fp_t fc_fp;
+
+ fcontext_t() :
+ fc_greg(),
+ fc_stack(),
+ fc_local_storage( 0),
+ fc_fp()
+ {}
+};
+
+}
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#if defined(BOOST_MSVC)
+#pragma warning(pop)
+#endif
+
+#endif // BOOST_CTX_DETAIL_FCONTEXT_X86_64_H
diff --git a/boost/context/fcontext.hpp b/boost/context/fcontext.hpp
new file mode 100644
index 0000000000..d2cc030a1e
--- /dev/null
+++ b/boost/context/fcontext.hpp
@@ -0,0 +1,82 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_FCONTEXT_H
+#define BOOST_CTX_FCONTEXT_H
+
+#if defined(__PGI)
+#include <stdint.h>
+#endif
+
+#include <boost/config.hpp>
+#include <boost/cstdint.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+// x86_64
+// test x86_64 before i386 because icc might
+// define __i686__ for x86_64 too
+#if defined(__x86_64__) || defined(__x86_64) \
+ || defined(__amd64__) || defined(__amd64) \
+ || defined(_M_X64) || defined(_M_AMD64)
+# if defined(BOOST_WINDOWS)
+# include <boost/context/detail/fcontext_x86_64_win.hpp>
+# else
+# include <boost/context/detail/fcontext_x86_64.hpp>
+# endif
+// i386
+#elif defined(i386) || defined(__i386__) || defined(__i386) \
+ || defined(__i486__) || defined(__i586__) || defined(__i686__) \
+ || defined(__X86__) || defined(_X86_) || defined(__THW_INTEL__) \
+ || defined(__I86__) || defined(__INTEL__) || defined(__IA32__) \
+ || defined(_M_IX86) || defined(_I86_)
+# if defined(BOOST_WINDOWS)
+# include <boost/context/detail/fcontext_i386_win.hpp>
+# else
+# include <boost/context/detail/fcontext_i386.hpp>
+# endif
+// arm
+#elif defined(__arm__) || defined(__thumb__) || defined(__TARGET_ARCH_ARM) \
+ || defined(__TARGET_ARCH_THUMB) || defined(_ARM)
+# include <boost/context/detail/fcontext_arm.hpp>
+// mips
+#elif (defined(__mips) && __mips == 1) || defined(_MIPS_ISA_MIPS1) \
+ || defined(_R3000)
+# include <boost/context/detail/fcontext_mips.hpp>
+// powerpc
+#elif defined(__powerpc) || defined(__powerpc__) || defined(__ppc) \
+ || defined(__ppc__) || defined(_ARCH_PPC) || defined(__POWERPC__) \
+ || defined(__PPCGECKO__) || defined(__PPCBROADWAY) || defined(_XENON)
+# include <boost/context/detail/fcontext_ppc.hpp>
+#else
+# error "platform not supported"
+#endif
+
+namespace boost {
+namespace ctx {
+namespace detail {
+
+extern "C" BOOST_CONTEXT_DECL void * BOOST_CONTEXT_CALLDECL align_stack( void * vp);
+
+}
+
+extern "C" BOOST_CONTEXT_DECL
+intptr_t BOOST_CONTEXT_CALLDECL jump_fcontext( fcontext_t * ofc, fcontext_t const* nfc, intptr_t vp, bool preserve_fpu = true);
+extern "C" BOOST_CONTEXT_DECL
+void BOOST_CONTEXT_CALLDECL make_fcontext( fcontext_t * fc, void (* fn)( intptr_t) );
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CTX_FCONTEXT_H
+
diff --git a/boost/context/stack_allocator.hpp b/boost/context/stack_allocator.hpp
new file mode 100644
index 0000000000..0db50157d1
--- /dev/null
+++ b/boost/context/stack_allocator.hpp
@@ -0,0 +1,37 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_STACK_ALLOCATOR_H
+#define BOOST_CTX_STACK_ALLOCATOR_H
+
+#include <cstddef>
+
+#include <boost/config.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+class BOOST_CONTEXT_DECL stack_allocator
+{
+public:
+ void * allocate( std::size_t) const;
+
+ void deallocate( void *, std::size_t) const;
+};
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CTX_STACK_ALLOCATOR_H
diff --git a/boost/context/stack_utils.hpp b/boost/context/stack_utils.hpp
new file mode 100644
index 0000000000..ca3ed2135f
--- /dev/null
+++ b/boost/context/stack_utils.hpp
@@ -0,0 +1,41 @@
+
+// Copyright Oliver Kowalke 2009.
+// 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_CTX_STACK_UTILS_H
+#define BOOST_CTX_STACK_UTILS_H
+
+#include <cstddef>
+
+#include <boost/config.hpp>
+
+#include <boost/context/detail/config.hpp>
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+
+namespace boost {
+namespace ctx {
+
+BOOST_CONTEXT_DECL std::size_t default_stacksize();
+
+BOOST_CONTEXT_DECL std::size_t minimum_stacksize();
+
+BOOST_CONTEXT_DECL std::size_t maximum_stacksize();
+
+BOOST_CONTEXT_DECL std::size_t pagesize();
+
+BOOST_CONTEXT_DECL std::size_t page_count( std::size_t stacksize);
+
+BOOST_CONTEXT_DECL bool is_stack_unbound();
+
+}}
+
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+
+#endif // BOOST_CTX_STACK_UTILS_H