/* Copyright (C) 2021 Free Software Foundation, Inc.
   Contributed by Oracle.

   This file is part of GNU Binutils.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#ifndef _COLLECTOR_MODULE_H
#define _COLLECTOR_MODULE_H

#include <sys/types.h>
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
#include <dirent.h>

#include "gp-defs.h"

struct stat;
struct tm;

#define COLLECTOR_MODULE_ERR    ((CollectorModule)-1)

/* -------  libc interface ----------------- */
/* the fields in this structure are in alphabetical order.
 * If you add any, please put it in the right place */
typedef struct CollectorUtilFuncs
{
  int (*access)();
  int (*atoi)(const char *nptr);
  void *(*calloc)(size_t nelem, size_t elsize);
  int (*clearenv)(void);
  int (*close)(int);
  int (*closedir)();
  int (*execv)(const char *path, char *const argv[]);
  void (*exit)(int status);
  int (*fclose)(FILE *stream);
  int (*fcntl)(int fd, int cmd, ...);
  char *(*fgets)(char *s, int n, FILE *stream);
  FILE *(*fopen)(const char *filename, const char *mode);
  pid_t (*vfork)();
  int (*fprintf)(FILE *stream, const char *format, ...);
  void (*free)(void *ptr);
  int (*fstat)(int fd, struct stat *buf);
  int (*getcpuid)();
  char *(*getcwd)(char *buf, size_t size);
  char *(*getenv)(const char *name);
  struct tm *(*gmtime_r)(const time_t *clock, struct tm *res);
  int (*ioctl)(int d, int request, ...);
  off_t (*lseek)(int fd, off_t offset, int whence);
  void *(*malloc)(size_t size);
  void *(*memset)(void *s1, int c, size_t n);
  int (*mkdir)();
  time_t (*mktime)(struct tm *timeptr);
  void *(*mmap)(void *, size_t, int, int, int, off_t);
  void *(*mmap64)();
  int (*munmap)();
  int (*open)(const char *, int, ...);
  int (*open_bare)(const char *, int, ...);
  DIR *(*opendir)();
  int (*pclose)(FILE *stream);
  FILE *(*popen)(const char *command, const char *mode);
  int (*putenv)(char *string);
  ssize_t (*pwrite)();
  ssize_t (*pwrite64)();
  ssize_t (*read)();
  int (*setenv)(const char *name, const char *value, int overwrite);
  int (*sigfillset)(sigset_t *set);
  int (*sigprocmask)(int how, const sigset_t *set, sigset_t *oldset);
  int (*snprintf)(char *str, size_t size, const char *format, ...);
  int (*stack_getbounds)();
  char *(*strchr)(const char *name, int c);
  int (*strcmp)(const char *s1, const char *s2);
  int (*strcpy)(const char *s1, const char *s2);
  char *(*libc_strdup)(const char *s1); // Don't use "strdup" because it is a macro in gcc
  char *(*strerror)(int errnum);
  int (*strerror_r)(int errnum, char *strerrbuf, size_t buflen);
  size_t (*strlcat)(char *dest, const char *src, size_t dstsize);
  size_t (*strlcpy)(char *dest, const char *src, size_t dstsize);
  size_t (*strlen)(const char *string);
  int (*strncmp)(const char *s1, const char *s2, size_t n);
  size_t (*strncpy)(char *dst, const char *src, size_t dstsize);
  size_t (*strspn)(const char *s1, const char *s2);
  char *(*strrchr)(const char *name, int c);
  char *(*strstr)(const char *s1, const char *s2);
  long int (*strtol)(const char *nptr, char **endptr, int base);
  long long int (*strtoll)(const char *nptr, char **endptr, int base);
  unsigned long int (*strtoul)(const char *nptr, char **endptr, int base);
  unsigned long long int (*strtoull)(const char *nptr, char **endptr, int base);
  int (*symlink)(const char *s1, const char *s2);
  int (*syscall)(int number, ...);
  long (*sysconf)(int name);
  long (*sysinfo)(int command, char *buf, long count);
  time_t (*time)(time_t *tloc);
  int (*unsetenv)(const char *name);
  int (*vsnprintf)(char *str, size_t size, const char *format, va_list ap);
  pid_t (*waitpid)(pid_t pid, int *stat_loc, int options);
  ssize_t (*write)();
  double (*atof)();
  void *n_a;
} CollectorUtilFuncs;

extern CollectorUtilFuncs __collector_util_funcs;
extern int __collector_dlsym_guard;

#define CALL_UTIL(x) __collector_util_funcs.x

/* The following constants define the meaning of the "void *arg"
 * argument of getFrameInfo().
 */
/* arg is a pointer to ucontext_t, walk the stack described by it */
#define FRINFO_FROM_UC          1
/* walk the current stack starting from the frame containing arg */
#define FRINFO_FROM_STACK       2
/* walk the current stack starting from the caller of the frame containing arg */
#define FRINFO_FROM_STACK_ARG   3
/* arg is a pc, process a stack containing just that pc */
#define FRINFO_FROM_PC          4
/* arg is of type CM_Array describing a stack image */
#define FRINFO_FROM_ARRAY       5
#define FRINFO_NO_OMP_INFO      0x80000000
#define FRINFO_NO_WALK          0x40000000

typedef struct CM_Array
{
  unsigned int length;          /* in bytes, not including length */
  void *bytes;
} CM_Array;

// Interface with libcollector.so:
typedef enum
{
  SP_ORIGIN_FORK        = -1,
  SP_ORIGIN_LIBCOL_INIT = 0,
  SP_ORIGIN_DBX_ATTACH  = 1,
  SP_ORIGIN_GENEXP      = 2,
  SP_ORIGIN_KERNEL      = 3,
  SP_ORIGIN_DTRACE      = 4,
  SP_ORIGIN_COLLECT     = 5
} sp_origin_t;

struct Heap;
struct Common_packet;
struct CM_Packet;
struct ModuleInterface;

typedef long long HiResTime;
typedef int CollectorModule;
typedef unsigned long long FrameInfo;
typedef struct CollectorInterface
{
  /* General services */
  CollectorModule (*registerModule)(struct ModuleInterface*);
  const char *(*getParams)();
  const char *(*getExpDir)();
  int (*writeLog)(char *format, ...);
  FrameInfo (*getFrameInfo)(CollectorModule modl, HiResTime ts, int mode, void *arg);
  FrameInfo (*getUID)(CM_Array *arg);
  FrameInfo (*getUID2)(CM_Array *arg, FrameInfo uid);
  int (*getStackTrace)(void *buf, int size, void *bptr, void *eptr, void *arg);
  int (*writeMetaData)(CollectorModule modl, char *format, ...);

  /* writeDataRecord ensures that the header is filled in, and then calls writeDataPacket */
  int (*writeDataRecord)(CollectorModule modl, struct Common_packet *pckt);
  int (*writeDataPacket)(CollectorModule modl, struct CM_Packet *pckt);
  void (*write_sample)(char *name);
  void (*get_progspec)(char *retstr, int tmp_sz, char *namestr, int name_sz);
  int (*open_experiment)(const char *exp, const char *params, sp_origin_t origin);
  HiResTime (*getHiResTime)();

  /* Dynamic memory allocation service */
  struct Heap *(*newHeap)();
  void (*deleteHeap)(struct Heap *heap);
  void *(*allocCSize)(struct Heap *heap, unsigned sz, int log);
  void (*freeCSize)(struct Heap *heap, void *ptr, unsigned sz);
  void *(*allocVSize)(struct Heap *heap, unsigned sz);
  void *(*reallocVSize)(struct Heap *heap, void *ptr, unsigned newsz);

  /* Thread specific data service */
  unsigned (*createKey)(size_t sz, void (*init)(void*), void (*fini)(void*));
  void *(*getKey)(unsigned key);

  /* Debugging services */
  void (*writeDebugInfo)(int, int, char *, ...) __attribute__ ((format (printf, 3, 4)));
} CollectorInterface;

typedef struct ModuleInterface
{
  char *description;
  int (*initInterface)(CollectorInterface*);
  int (*openExperiment)(const char *);
  int (*startDataCollection)();
  int (*stopDataCollection)();
  int (*closeExperiment)();
  int (*detachExperiment)(); /* called from fork-child before openExperiment() */
} ModuleInterface;

typedef CollectorModule (*RegModuleFunc)(ModuleInterface*);
typedef void (*ModuleInitFunc)(CollectorInterface*);

#ifdef __cplusplus
extern "C"
{
#endif
  CollectorModule __collector_register_module (ModuleInterface *modint);
#ifdef __cplusplus
}
#endif

#ifdef __has_attribute
# if __has_attribute (__symver__)
#  define SYMVER_ATTRIBUTE(sym, symver) \
    __attribute__ ((__symver__ (#symver)))
# endif
#endif
#ifndef SYMVER_ATTRIBUTE
# define SYMVER_ATTRIBUTE(sym, symver) \
  __asm__(".symver " #sym "," #symver);
#endif

#endif /* _COLLECTOR_MODULE_H */