//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is dual licensed under the MIT and the University of Illinois Open
// Source Licenses. See LICENSE.txt for details.
//
//===----------------------------------------------------------------------===//


#ifndef OFFLOAD_UTIL_H_INCLUDED
#define OFFLOAD_UTIL_H_INCLUDED

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>

#ifdef TARGET_WINNT
#include <windows.h>
#include <process.h>
#else // TARGET_WINNT
#include <dlfcn.h>
#include <pthread.h>
#endif // TARGET_WINNT

#ifdef TARGET_WINNT
typedef unsigned pthread_key_t;
typedef int pid_t;

#define __func__ __FUNCTION__
#define strtok_r(s,d,p) strtok_s(s,d,p)
#define strcasecmp(a,b) stricmp(a,b)

#define thread_key_create(key, destructor) \
    (((*key = TlsAlloc()) > 0) ? 0 : GetLastError())
#define thread_key_delete(key) TlsFree(key)

#ifndef S_ISREG
#define S_ISREG(mode)  (((mode) & S_IFMT) == S_IFREG)
#endif

void*   thread_getspecific(pthread_key_t key);
int     thread_setspecific(pthread_key_t key, const void *value);
#else
#define thread_key_create(key, destructor) \
            pthread_key_create((key), (destructor))
#define thread_key_delete(key)  pthread_key_delete(key)
#define thread_getspecific(key) pthread_getspecific(key)
#define thread_setspecific(key, value) pthread_setspecific(key, value)
#endif // TARGET_WINNT

// Mutex implementation
struct mutex_t {
    mutex_t() {
#ifdef TARGET_WINNT
        InitializeCriticalSection(&m_lock);
#else // TARGET_WINNT
        pthread_mutex_init(&m_lock, 0);
#endif // TARGET_WINNT
    }

    ~mutex_t() {
#ifdef TARGET_WINNT
        DeleteCriticalSection(&m_lock);
#else // TARGET_WINNT
        pthread_mutex_destroy(&m_lock);
#endif // TARGET_WINNT
    }

    void lock() {
#ifdef TARGET_WINNT
        EnterCriticalSection(&m_lock);
#else // TARGET_WINNT
        pthread_mutex_lock(&m_lock);
#endif // TARGET_WINNT
    }

    void unlock() {
#ifdef TARGET_WINNT
        LeaveCriticalSection(&m_lock);
#else // TARGET_WINNT
        pthread_mutex_unlock(&m_lock);
#endif // TARGET_WINNT
    }

private:
#ifdef TARGET_WINNT
    CRITICAL_SECTION    m_lock;
#else
    pthread_mutex_t     m_lock;
#endif
};

struct mutex_locker_t {
    mutex_locker_t(mutex_t &mutex) : m_mutex(mutex) {
        m_mutex.lock();
    }

    ~mutex_locker_t() {
        m_mutex.unlock();
    }

private:
    mutex_t &m_mutex;
};

// Dynamic loader interface
#ifdef TARGET_WINNT
struct Dl_info
{
    char        dli_fname[MAX_PATH];
    void       *dli_fbase;
    char        dli_sname[MAX_PATH];
    const void *dli_saddr;
};

void*   DL_open(const char *path);
#define DL_close(handle)        FreeLibrary((HMODULE) (handle))
int     DL_addr(const void *addr, Dl_info *info);
#else
#define DL_open(path)           dlopen((path), RTLD_NOW)
#define DL_close(handle)        dlclose(handle)
#define DL_addr(addr, info)     dladdr((addr), (info))
#endif // TARGET_WINNT

extern void* DL_sym(void *handle, const char *name, const char *version);

// One-time initialization API
#ifdef TARGET_WINNT
typedef INIT_ONCE                   OffloadOnceControl;
#define OFFLOAD_ONCE_CONTROL_INIT   INIT_ONCE_STATIC_INIT

extern void __offload_run_once(OffloadOnceControl *ctrl, void (*func)(void));
#else
typedef pthread_once_t              OffloadOnceControl;
#define OFFLOAD_ONCE_CONTROL_INIT   PTHREAD_ONCE_INIT

#define __offload_run_once(ctrl, func) pthread_once(ctrl, func)
#endif // TARGET_WINNT

// Parses size specification string.
extern bool __offload_parse_size_string(const char *str, uint64_t &new_size);

// Parses string with integer value
extern bool __offload_parse_int_string(const char *str, int64_t &value);

// get value by its base, offset and size
int64_t get_el_value(
    char   *base,
    int64_t offset,
    int64_t size
);
#endif // OFFLOAD_UTIL_H_INCLUDED