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#pragma once
#include "align.h"
#include "defaults.h"
#include "compiler.h"
#include "sanitizers.h"
#include <util/generic/array_ref.h>
#include <util/generic/utility.h>
#include <util/generic/yexception.h>
#define STACK_ALIGN (8 * PLATFORM_DATA_ALIGN)
#if defined(_x86_64_) || defined(_i386_) || defined(_arm_) || defined(_ppc64_)
#define STACK_GROW_DOWN 1
#else
#error todo
#endif
/*
* switch method
*/
#if defined(_bionic_) || defined(__IOS__)
#define USE_GENERIC_CONT
#elif defined(_cygwin_)
#define USE_UCONTEXT_CONT
#elif defined(_win_)
#define USE_FIBER_CONT
#elif (defined(_i386_) || defined(_x86_64_) || defined(_arm64_)) && !defined(_k1om_)
#define USE_JUMP_CONT
#else
#define USE_UCONTEXT_CONT
#endif
#if defined(USE_JUMP_CONT)
#if defined(_arm64_)
#include "context_aarch64.h"
#else
#include "context_x86.h"
#endif
#endif
#if defined(USE_UCONTEXT_CONT)
#include <ucontext.h>
#endif
struct ITrampoLine {
virtual ~ITrampoLine() = default;
virtual void DoRun();
virtual void DoRunNaked();
};
struct TContClosure {
ITrampoLine* TrampoLine;
TArrayRef<char> Stack;
const char* ContName = nullptr;
};
#if defined(USE_UCONTEXT_CONT)
class TContMachineContext {
typedef void (*ucontext_func_t)(void);
public:
inline TContMachineContext() {
getcontext(&Ctx_);
}
inline TContMachineContext(const TContClosure& c) {
getcontext(&Ctx_);
Ctx_.uc_link = 0;
Ctx_.uc_stack.ss_sp = (void*)c.Stack.data();
Ctx_.uc_stack.ss_size = c.Stack.size();
Ctx_.uc_stack.ss_flags = 0;
extern void ContextTrampoLine(void* arg);
makecontext(&Ctx_, (ucontext_func_t)ContextTrampoLine, 1, c.TrampoLine);
}
inline ~TContMachineContext() {
}
inline void SwitchTo(TContMachineContext* next) noexcept {
swapcontext(&Ctx_, &next->Ctx_);
}
private:
ucontext_t Ctx_;
};
#endif
#if defined(USE_GENERIC_CONT)
class TContMachineContext {
struct TImpl;
public:
TContMachineContext();
TContMachineContext(const TContClosure& c);
~TContMachineContext();
void SwitchTo(TContMachineContext* next) noexcept;
private:
THolder<TImpl> Impl_;
};
#endif
#if defined(USE_FIBER_CONT)
class TContMachineContext {
public:
TContMachineContext();
TContMachineContext(const TContClosure& c);
~TContMachineContext();
void SwitchTo(TContMachineContext* next) noexcept;
private:
void* Fiber_;
bool MainFiber_;
};
#endif
#if defined(USE_JUMP_CONT)
class TContMachineContext {
public:
inline TContMachineContext() {
Zero(Buf_);
}
TContMachineContext(const TContClosure& c);
inline ~TContMachineContext() = default;
void SwitchTo(TContMachineContext* next) noexcept;
private:
__myjmp_buf Buf_;
struct TSan: public ITrampoLine, public ::NSan::TFiberContext {
TSan() noexcept;
TSan(const TContClosure& c) noexcept;
void DoRunNaked() override;
ITrampoLine* TL;
};
#if defined(_asan_enabled_) || defined(_tsan_enabled_)
TSan San_;
#endif
};
#endif
static inline size_t MachineContextSize() noexcept {
return sizeof(TContMachineContext);
}
/*
* be polite
*/
#if !defined(FROM_CONTEXT_IMPL)
#undef USE_JUMP_CONT
#undef USE_FIBER_CONT
#undef USE_GENERIC_CONT
#undef USE_UCONTEXT_CONT
#undef PROGR_CNT
#undef STACK_CNT
#undef EXTRA_PUSH_ARGS
#endif
struct TExceptionSafeContext: public TContMachineContext {
using TContMachineContext::TContMachineContext;
void SwitchTo(TExceptionSafeContext* to) noexcept;
#if defined(_unix_)
void* Buf_[2] = {nullptr, nullptr};
#endif
};
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