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ocaml/runtime/caml/misc.h

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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy and Damien Doligez, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
/* Miscellaneous macros and variables. */
#ifndef CAML_MISC_H
#define CAML_MISC_H
#ifndef CAML_NAME_SPACE
#include "compatibility.h"
#endif
#include "config.h"
/* Standard definitions */
#include <stddef.h>
#include <stdlib.h>
/* Basic types and constants */
typedef size_t asize_t;
#ifndef NULL
#define NULL 0
#endif
#ifdef CAML_INTERNALS
typedef char * addr;
#endif /* CAML_INTERNALS */
/* Noreturn is preserved for compatibility reasons.
Instead of the legacy GCC/Clang-only
foo Noreturn;
you should prefer
CAMLnoreturn_start foo CAMLnoreturn_end;
which supports both GCC/Clang and MSVC.
Note: CAMLnoreturn is a different macro defined in memory.h,
to be used in function bodies rather than as a prototype attribute.
*/
#ifdef __GNUC__
/* Works only in GCC 2.5 and later */
#define CAMLnoreturn_start
#define CAMLnoreturn_end __attribute__ ((noreturn))
#define Noreturn __attribute__ ((noreturn))
#elif _MSC_VER >= 1500
#define CAMLnoreturn_start __declspec(noreturn)
#define CAMLnoreturn_end
#define Noreturn
#else
#define CAMLnoreturn_start
#define CAMLnoreturn_end
#define Noreturn
#endif
/* Export control (to mark primitives and to handle Windows DLL) */
#define CAMLexport
#define CAMLprim
#define CAMLextern extern
/* Weak function definitions that can be overridden by external libs */
/* Conservatively restricted to ELF and MacOSX platforms */
#if defined(__GNUC__) && (defined (__ELF__) || defined(__APPLE__))
#define CAMLweakdef __attribute__((weak))
#else
#define CAMLweakdef
#endif
#ifdef __cplusplus
extern "C" {
#endif
/* GC timing hooks. These can be assigned by the user.
[caml_minor_gc_begin_hook] must not allocate nor change any heap value.
The others can allocate and even call back to OCaml code.
*/
typedef void (*caml_timing_hook) (void);
extern caml_timing_hook caml_major_slice_begin_hook, caml_major_slice_end_hook;
extern caml_timing_hook caml_minor_gc_begin_hook, caml_minor_gc_end_hook;
extern caml_timing_hook caml_finalise_begin_hook, caml_finalise_end_hook;
/* Windows Unicode support (rest below - char_os is needed earlier) */
#ifdef _WIN32
typedef wchar_t char_os;
#else
typedef char char_os;
#endif
/* Assertions */
#ifdef DEBUG
#ifdef UNICODE
/* See https://msdn.microsoft.com/ja-jp/library/b0084kay(v=vs.71).aspx
It's not clear why this isn't so obviously documented, as it doesn't
seem to have been superseded by a more sensible mechanism! */
#define CAML_WIDEN_STRING_LITERAL2(x) L##x
#define CAML_WIDEN_STRING_LITERAL(x) CAML_WIDEN_STRING_LITERAL2(x)
#define __OSFILE__ CAML_WIDEN_STRING_LITERAL(__FILE__)
#else
#define __OSFILE__ __FILE__
#endif
#define CAMLassert(x) \
((x) ? (void) 0 : caml_failed_assert ( #x , __OSFILE__, __LINE__))
CAMLnoreturn_start
CAMLextern void caml_failed_assert (char *, char_os *, int)
CAMLnoreturn_end;
#else
#define CAMLassert(x) ((void) 0)
#endif
CAMLnoreturn_start
CAMLextern void caml_fatal_error (char *, ...)
#ifdef __GNUC__
__attribute__ ((format (printf, 1, 2)))
#endif
CAMLnoreturn_end;
/* Detection of available C built-in functions, the Clang way. */
#ifdef __has_builtin
#define Caml_has_builtin(x) __has_builtin(x)
#else
#define Caml_has_builtin(x) 0
#endif
/* Integer arithmetic with overflow detection.
The functions return 0 if no overflow, 1 if overflow.
The result of the operation is always stored at [*res].
If no overflow is reported, this is the exact result.
If overflow is reported, this is the exact result modulo 2 to the word size.
*/
static inline int caml_uadd_overflow(uintnat a, uintnat b, uintnat * res)
{
#if __GNUC__ >= 5 || Caml_has_builtin(__builtin_add_overflow)
return __builtin_add_overflow(a, b, res);
#else
uintnat c = a + b;
*res = c;
return c < a;
#endif
}
static inline int caml_usub_overflow(uintnat a, uintnat b, uintnat * res)
{
#if __GNUC__ >= 5 || Caml_has_builtin(__builtin_sub_overflow)
return __builtin_sub_overflow(a, b, res);
#else
uintnat c = a - b;
*res = c;
return a < b;
#endif
}
#if __GNUC__ >= 5 || Caml_has_builtin(__builtin_mul_overflow)
static inline int caml_umul_overflow(uintnat a, uintnat b, uintnat * res)
{
return __builtin_mul_overflow(a, b, res);
}
#else
extern int caml_umul_overflow(uintnat a, uintnat b, uintnat * res);
#endif
/* Windows Unicode support */
#ifdef _WIN32
#define _T(x) L ## x
#define access_os _waccess
#define open_os _wopen
#define stat_os _wstati64
#define unlink_os _wunlink
#define rename_os caml_win32_rename
#define chdir_os _wchdir
#define getcwd_os _wgetcwd
#define system_os _wsystem
#define rmdir_os _wrmdir
#define putenv_os _wputenv
#define chmod_os _wchmod
#define execv_os _wexecv
#define execve_os _wexecve
#define execvp_os _wexecvp
#define execvpe_os _wexecvpe
#define strcmp_os wcscmp
#define strlen_os wcslen
#define sscanf_os swscanf
#define caml_stat_strdup_os caml_stat_wcsdup
#define caml_stat_strconcat_os caml_stat_wcsconcat
#define caml_stat_strdup_to_os caml_stat_strdup_to_utf16
#define caml_stat_strdup_of_os caml_stat_strdup_of_utf16
#define caml_copy_string_of_os caml_copy_string_of_utf16
#else /* _WIN32 */
#define _T(x) x
#define access_os access
#define open_os open
#define stat_os stat
#define unlink_os unlink
#define rename_os rename
#define chdir_os chdir
#define getcwd_os getcwd
#define system_os system
#define rmdir_os rmdir
#define putenv_os putenv
#define chmod_os chmod
#define execv_os execv
#define execve_os execve
#define execvp_os execvp
#define execvpe_os execvpe
#define strcmp_os strcmp
#define strlen_os strlen
#define sscanf_os sscanf
#define caml_stat_strdup_os caml_stat_strdup
#define caml_stat_strconcat_os caml_stat_strconcat
#define caml_stat_strdup_to_os caml_stat_strdup
#define caml_stat_strdup_of_os caml_stat_strdup
#define caml_copy_string_of_os caml_copy_string
#endif /* _WIN32 */
/* Use macros for some system calls being called from OCaml itself.
These calls can be either traced for security reasons, or changed to
virtualize the program. */
#ifndef CAML_WITH_CPLUGINS
#define CAML_SYS_EXIT(retcode) exit(retcode)
#define CAML_SYS_OPEN(filename,flags,perm) open_os(filename,flags,perm)
#define CAML_SYS_CLOSE(fd) close(fd)
#define CAML_SYS_STAT(filename,st) stat_os(filename,st)
#define CAML_SYS_UNLINK(filename) unlink_os(filename)
#define CAML_SYS_RENAME(old_name,new_name) rename_os(old_name, new_name)
#define CAML_SYS_CHDIR(dirname) chdir_os(dirname)
#define CAML_SYS_GETENV(varname) getenv(varname)
#define CAML_SYS_SYSTEM(command) system_os(command)
#define CAML_SYS_READ_DIRECTORY(dirname,tbl) caml_read_directory(dirname,tbl)
#else
#define CAML_CPLUGINS_EXIT 0
#define CAML_CPLUGINS_OPEN 1
#define CAML_CPLUGINS_CLOSE 2
#define CAML_CPLUGINS_STAT 3
#define CAML_CPLUGINS_UNLINK 4
#define CAML_CPLUGINS_RENAME 5
#define CAML_CPLUGINS_CHDIR 6
#define CAML_CPLUGINS_GETENV 7
#define CAML_CPLUGINS_SYSTEM 8
#define CAML_CPLUGINS_READ_DIRECTORY 9
#define CAML_CPLUGINS_PRIMS_MAX 9
#define CAML_CPLUGINS_PRIMS_BITMAP ((1 << CAML_CPLUGINS_PRIMS_MAX)-1)
extern intnat (*caml_cplugins_prim)(int,intnat,intnat,intnat);
#define CAML_SYS_PRIM_1(code,prim,arg1) \
(caml_cplugins_prim == NULL) ? prim(arg1) : \
caml_cplugins_prim(code,(intnat) (arg1),0,0)
#define CAML_SYS_STRING_PRIM_1(code,prim,arg1) \
(caml_cplugins_prim == NULL) ? prim(arg1) : \
(char_os*)caml_cplugins_prim(code,(intnat) (arg1),0,0)
#define CAML_SYS_VOID_PRIM_1(code,prim,arg1) \
(caml_cplugins_prim == NULL) ? prim(arg1) : \
(void)caml_cplugins_prim(code,(intnat) (arg1),0,0)
#define CAML_SYS_PRIM_2(code,prim,arg1,arg2) \
(caml_cplugins_prim == NULL) ? prim(arg1,arg2) : \
caml_cplugins_prim(code,(intnat) (arg1), (intnat) (arg2),0)
#define CAML_SYS_PRIM_3(code,prim,arg1,arg2,arg3) \
(caml_cplugins_prim == NULL) ? prim(arg1,arg2,arg3) : \
caml_cplugins_prim(code,(intnat) (arg1), (intnat) (arg2),(intnat) (arg3))
#define CAML_SYS_EXIT(retcode) \
CAML_SYS_VOID_PRIM_1(CAML_CPLUGINS_EXIT,exit,retcode)
#define CAML_SYS_OPEN(filename,flags,perm) \
CAML_SYS_PRIM_3(CAML_CPLUGINS_OPEN,open_os,filename,flags,perm)
#define CAML_SYS_CLOSE(fd) \
CAML_SYS_PRIM_1(CAML_CPLUGINS_CLOSE,close,fd)
#define CAML_SYS_STAT(filename,st) \
CAML_SYS_PRIM_2(CAML_CPLUGINS_STAT,stat_os,filename,st)
#define CAML_SYS_UNLINK(filename) \
CAML_SYS_PRIM_1(CAML_CPLUGINS_UNLINK,unlink_os,filename)
#define CAML_SYS_RENAME(old_name,new_name) \
CAML_SYS_PRIM_2(CAML_CPLUGINS_RENAME,rename_os,old_name,new_name)
#define CAML_SYS_CHDIR(dirname) \
CAML_SYS_PRIM_1(CAML_CPLUGINS_CHDIR,chdir_os,dirname)
#define CAML_SYS_GETENV(varname) \
CAML_SYS_STRING_PRIM_1(CAML_CPLUGINS_GETENV,getenv,varname)
#define CAML_SYS_SYSTEM(command) \
CAML_SYS_PRIM_1(CAML_CPLUGINS_SYSTEM,system_os,command)
#define CAML_SYS_READ_DIRECTORY(dirname,tbl) \
CAML_SYS_PRIM_2(CAML_CPLUGINS_READ_DIRECTORY,caml_read_directory, \
dirname,tbl)
#define CAML_CPLUGIN_CONTEXT_API 0
struct cplugin_context {
int api_version;
int prims_bitmap;
char_os *exe_name;
char_os** argv;
char_os *plugin; /* absolute filename of plugin, do a copy if you need it ! */
char *ocaml_version;
/* end of CAML_CPLUGIN_CONTEXT_API version 0 */
};
extern void caml_cplugins_init(char_os * exe_name, char_os **argv);
/* A plugin MUST define a symbol "caml_cplugin_init" with the prototype:
void caml_cplugin_init(struct cplugin_context *ctx)
*/
/* to write plugins for CAML_SYS_READ_DIRECTORY, we will need the
definition of struct ext_table to be public. */
#endif /* CAML_WITH_CPLUGINS */
/* Data structures */
struct ext_table {
int size;
int capacity;
void ** contents;
};
extern void caml_ext_table_init(struct ext_table * tbl, int init_capa);
extern int caml_ext_table_add(struct ext_table * tbl, void * data);
extern void caml_ext_table_remove(struct ext_table * tbl, void * data);
extern void caml_ext_table_free(struct ext_table * tbl, int free_entries);
extern void caml_ext_table_clear(struct ext_table * tbl, int free_entries);
CAMLextern int caml_read_directory(char_os * dirname,
struct ext_table * contents);
/* Deprecated aliases */
#define caml_aligned_malloc caml_stat_alloc_aligned_noexc
#define caml_strdup caml_stat_strdup
#define caml_strconcat caml_stat_strconcat
#ifdef CAML_INTERNALS
/* GC flags and messages */
extern uintnat caml_verb_gc;
void caml_gc_message (int, char *, ...)
#ifdef __GNUC__
__attribute__ ((format (printf, 2, 3)))
#endif
;
/* Runtime warnings */
extern uintnat caml_runtime_warnings;
int caml_runtime_warnings_active(void);
#ifdef DEBUG
#ifdef ARCH_SIXTYFOUR
#define Debug_tag(x) (INT64_LITERAL(0xD700D7D7D700D6D7u) \
| ((uintnat) (x) << 16) \
| ((uintnat) (x) << 48))
#else
#define Debug_tag(x) (0xD700D6D7ul | ((uintnat) (x) << 16))
#endif /* ARCH_SIXTYFOUR */
/*
00 -> free words in minor heap
01 -> fields of free list blocks in major heap
03 -> heap chunks deallocated by heap shrinking
04 -> fields deallocated by [caml_obj_truncate]
10 -> uninitialised fields of minor objects
11 -> uninitialised fields of major objects
15 -> uninitialised words of [caml_stat_alloc_aligned] blocks
85 -> filler bytes of [caml_stat_alloc_aligned]
99 -> the magic prefix of a memory block allocated by [caml_stat_alloc]
special case (byte by byte):
D7 -> uninitialised words of [caml_stat_alloc] blocks
*/
#define Debug_free_minor Debug_tag (0x00)
#define Debug_free_major Debug_tag (0x01)
#define Debug_free_shrink Debug_tag (0x03)
#define Debug_free_truncate Debug_tag (0x04)
#define Debug_uninit_minor Debug_tag (0x10)
#define Debug_uninit_major Debug_tag (0x11)
#define Debug_uninit_align Debug_tag (0x15)
#define Debug_filler_align Debug_tag (0x85)
#define Debug_pool_magic Debug_tag (0x99)
#define Debug_uninit_stat 0xD7
/* Note: the first argument is in fact a [value] but we don't have this
type available yet because we can't include [mlvalues.h] in this file.
*/
extern void caml_set_fields (intnat v, uintnat, uintnat);
#endif /* DEBUG */
/* snprintf emulation for Win32 */
#if defined(_WIN32) && !defined(_UCRT)
extern int caml_snprintf(char * buf, size_t size, const char * format, ...);
#define snprintf caml_snprintf
#endif
#ifdef CAML_INSTR
/* Timers and counters for GC latency profiling (Linux-only) */
#include <time.h>
#include <stdio.h>
extern intnat caml_stat_minor_collections;
extern intnat CAML_INSTR_STARTTIME, CAML_INSTR_STOPTIME;
struct CAML_INSTR_BLOCK {
struct timespec ts[10];
char *tag[10];
int index;
struct CAML_INSTR_BLOCK *next;
};
extern struct CAML_INSTR_BLOCK *CAML_INSTR_LOG;
/* Declare a timer/counter name. [t] must be a new variable name. */
#define CAML_INSTR_DECLARE(t) \
struct CAML_INSTR_BLOCK *t = NULL
/* Allocate the data block for a given name.
[t] must have been declared with [CAML_INSTR_DECLARE]. */
#define CAML_INSTR_ALLOC(t) do{ \
if (caml_stat_minor_collections >= CAML_INSTR_STARTTIME \
&& caml_stat_minor_collections < CAML_INSTR_STOPTIME){ \
t = caml_stat_alloc_noexc (sizeof (struct CAML_INSTR_BLOCK)); \
t->index = 0; \
t->tag[0] = ""; \
t->next = CAML_INSTR_LOG; \
CAML_INSTR_LOG = t; \
} \
}while(0)
/* Allocate the data block and start the timer.
[t] must have been declared with [CAML_INSTR_DECLARE]
and allocated with [CAML_INSTR_ALLOC]. */
#define CAML_INSTR_START(t, msg) do{ \
if (t != NULL){ \
t->tag[0] = msg; \
clock_gettime (CLOCK_REALTIME, &(t->ts[0])); \
} \
}while(0)
/* Declare a timer, allocate its data, and start it.
[t] must be a new variable name. */
#define CAML_INSTR_SETUP(t, msg) \
CAML_INSTR_DECLARE (t); \
CAML_INSTR_ALLOC (t); \
CAML_INSTR_START (t, msg)
/* Record an intermediate time within a given timer.
[t] must have been declared, allocated, and started. */
#define CAML_INSTR_TIME(t, msg) do{ \
if (t != NULL){ \
++ t->index; \
t->tag[t->index] = (msg); \
clock_gettime (CLOCK_REALTIME, &(t->ts[t->index])); \
} \
}while(0)
/* Record an integer data point.
If [msg] ends with # it will be interpreted as an integer-valued event.
If it ends with @ it will be interpreted as an event counter.
*/
#define CAML_INSTR_INT(msg, data) do{ \
CAML_INSTR_SETUP (__caml_tmp, ""); \
if (__caml_tmp != NULL){ \
__caml_tmp->index = 1; \
__caml_tmp->tag[1] = msg; \
__caml_tmp->ts[1].tv_sec = 0; \
__caml_tmp->ts[1].tv_nsec = (data); \
} \
}while(0)
/* This function is called at the start of the program to set up
the data for the above macros.
*/
extern void CAML_INSTR_INIT (void);
/* This function is automatically called by the runtime to output
the collected data to the dump file. */
extern void CAML_INSTR_ATEXIT (void);
#else /* CAML_INSTR */
#define CAML_INSTR_DECLARE(t) /**/
#define CAML_INSTR_ALLOC(t) /**/
#define CAML_INSTR_START(t, name) /**/
#define CAML_INSTR_SETUP(t, name) /**/
#define CAML_INSTR_TIME(t, msg) /**/
#define CAML_INSTR_INT(msg, c) /**/
#define CAML_INSTR_INIT() /**/
#define CAML_INSTR_ATEXIT() /**/
#endif /* CAML_INSTR */
#endif /* CAML_INTERNALS */
#ifdef __cplusplus
}
#endif
#endif /* CAML_MISC_H */
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