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4b67cc371e
nasm/nasmlib.h
Cyrill Gorcunov 4b67cc371e introduce "overflow" helpers 
Suggested-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
2009-10-13 19:41:53 +04:00

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/* ----------------------------------------------------------------------- *
*
* Copyright 1996-2009 The NASM Authors - All Rights Reserved
* See the file AUTHORS included with the NASM distribution for
* the specific copyright holders.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ----------------------------------------------------------------------- */
/*
* nasmlib.h header file for nasmlib.c
*/
#ifndef NASM_NASMLIB_H
#define NASM_NASMLIB_H
#include "compiler.h"
#include <inttypes.h>
#include <stdio.h>
#include <string.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
/*
* tolower table -- avoids a function call on some platforms.
* NOTE: unlike the tolower() function in ctype, EOF is *NOT*
* a permitted value, for obvious reasons.
*/
void tolower_init(void);
extern unsigned char nasm_tolower_tab[256];
#define nasm_tolower(x) nasm_tolower_tab[(unsigned char)(x)]
/* Wrappers around <ctype.h> functions */
/* These are only valid for values that cannot include EOF */
#define nasm_isspace(x) isspace((unsigned char)(x))
#define nasm_isalpha(x) isalpha((unsigned char)(x))
#define nasm_isdigit(x) isdigit((unsigned char)(x))
#define nasm_isalnum(x) isalnum((unsigned char)(x))
#define nasm_isxdigit(x) isxdigit((unsigned char)(x))
/*
* If this is defined, the wrappers around malloc et al will
* transform into logging variants, which will cause NASM to create
* a file called `malloc.log' when run, and spew details of all its
* memory management into that. That can then be analysed to detect
* memory leaks and potentially other problems too.
*/
/* #define LOGALLOC */
/*
* -------------------------
* Error reporting functions
* -------------------------
*/
/*
* An error reporting function should look like this.
*/
typedef void (*efunc) (int severity, const char *fmt, ...);
typedef void (*vefunc) (int severity, const char *fmt, va_list ap);
#ifdef __GNUC__
void nasm_error(int severity, const char *fmt, ...) __attribute__((format(printf, 2, 3)));
#else
void nasm_error(int severity, const char *fmt, ...);
#endif
void nasm_set_verror(vefunc);
/*
* These are the error severity codes which get passed as the first
* argument to an efunc.
*/
#define ERR_DEBUG 0x00000008 /* put out debugging message */
#define ERR_WARNING 0x00000000 /* warn only: no further action */
#define ERR_NONFATAL 0x00000001 /* terminate assembly after phase */
#define ERR_FATAL 0x00000002 /* instantly fatal: exit with error */
#define ERR_PANIC 0x00000003 /* internal error: panic instantly
* and dump core for reference */
#define ERR_MASK 0x0000000F /* mask off the above codes */
#define ERR_NOFILE 0x00000010 /* don't give source file name/line */
#define ERR_USAGE 0x00000020 /* print a usage message */
#define ERR_PASS1 0x00000040 /* only print this error on pass one */
#define ERR_PASS2 0x00000080
#define ERR_NO_SEVERITY 0x00000100 /* suppress printing severity */
/*
* These codes define specific types of suppressible warning.
*/
#define ERR_WARN_MASK 0xFFFFF000 /* the mask for this feature */
#define ERR_WARN_SHR 12 /* how far to shift right */
#define WARN(x) ((x) << ERR_WARN_SHR)
#define ERR_WARN_MNP WARN( 1) /* macro-num-parameters warning */
#define ERR_WARN_MSR WARN( 2) /* macro self-reference */
#define ERR_WARN_MDP WARN( 3) /* macro default parameters check */
#define ERR_WARN_OL WARN( 4) /* orphan label (no colon, and
* alone on line) */
#define ERR_WARN_NOV WARN( 5) /* numeric overflow */
#define ERR_WARN_GNUELF WARN( 6) /* using GNU ELF extensions */
#define ERR_WARN_FL_OVERFLOW WARN( 7) /* FP overflow */
#define ERR_WARN_FL_DENORM WARN( 8) /* FP denormal */
#define ERR_WARN_FL_UNDERFLOW WARN( 9) /* FP underflow */
#define ERR_WARN_FL_TOOLONG WARN(10) /* FP too many digits */
#define ERR_WARN_USER WARN(11) /* %warning directives */
#define ERR_WARN_MAX 11 /* the highest numbered one */
/*
* Wrappers around malloc, realloc and free. nasm_malloc will
* fatal-error and die rather than return NULL; nasm_realloc will
* do likewise, and will also guarantee to work right on being
* passed a NULL pointer; nasm_free will do nothing if it is passed
* a NULL pointer.
*/
void nasm_init_malloc_error(void);
#ifndef LOGALLOC
void *nasm_malloc(size_t);
void *nasm_zalloc(size_t);
void *nasm_realloc(void *, size_t);
void nasm_free(void *);
char *nasm_strdup(const char *);
char *nasm_strndup(const char *, size_t);
#else
void *nasm_malloc_log(const char *, int, size_t);
void *nasm_zalloc_log(const char *, int, size_t);
void *nasm_realloc_log(const char *, int, void *, size_t);
void nasm_free_log(const char *, int, void *);
char *nasm_strdup_log(const char *, int, const char *);
char *nasm_strndup_log(const char *, int, const char *, size_t);
#define nasm_malloc(x) nasm_malloc_log(__FILE__,__LINE__,x)
#define nasm_zalloc(x) nasm_zalloc_log(__FILE__,__LINE__,x)
#define nasm_realloc(x,y) nasm_realloc_log(__FILE__,__LINE__,x,y)
#define nasm_free(x) nasm_free_log(__FILE__,__LINE__,x)
#define nasm_strdup(x) nasm_strdup_log(__FILE__,__LINE__,x)
#define nasm_strndup(x,y) nasm_strndup_log(__FILE__,__LINE__,x,y)
#endif
/*
* NASM assert failure
*/
no_return nasm_assert_failed(const char *, int, const char *);
#define nasm_assert(x) \
do { \
if (unlikely(!(x))) \
nasm_assert_failed(__FILE__,__LINE__,#x); \
} while (0)
/*
* ANSI doesn't guarantee the presence of `stricmp' or
* `strcasecmp'.
*/
#if defined(HAVE_STRCASECMP)
#define nasm_stricmp strcasecmp
#elif defined(HAVE_STRICMP)
#define nasm_stricmp stricmp
#else
int nasm_stricmp(const char *, const char *);
#endif
#if defined(HAVE_STRNCASECMP)
#define nasm_strnicmp strncasecmp
#elif defined(HAVE_STRNICMP)
#define nasm_strnicmp strnicmp
#else
int nasm_strnicmp(const char *, const char *, size_t);
#endif
int nasm_memicmp(const char *, const char *, size_t);
#if defined(HAVE_STRSEP)
#define nasm_strsep strsep
#else
char *nasm_strsep(char **stringp, const char *delim);
#endif
/*
* Convert a string into a number, using NASM number rules. Sets
* `*error' to true if an error occurs, and false otherwise.
*/
int64_t readnum(char *str, bool *error);
/*
* Convert a character constant into a number. Sets
* `*warn' to true if an overflow occurs, and false otherwise.
* str points to and length covers the middle of the string,
* without the quotes.
*/
int64_t readstrnum(char *str, int length, bool *warn);
/*
* seg_init: Initialise the segment-number allocator.
* seg_alloc: allocate a hitherto unused segment number.
*/
void seg_init(void);
int32_t seg_alloc(void);
/*
* many output formats will be able to make use of this: a standard
* function to add an extension to the name of the input file
*/
void standard_extension(char *inname, char *outname, char *extension);
/*
* Utility macros...
*
* This is a useful #define which I keep meaning to use more often:
* the number of elements of a statically defined array.
*/
#define elements(x) ( sizeof(x) / sizeof(*(x)) )
/*
* List handling
*
* list_for_each - regular iterator over list
* list_for_each_safe - the same but safe against list items removal
*/
#define list_for_each(pos, head) \
for (pos = head; pos; pos = pos->next)
#define list_for_each_safe(pos, n, head) \
for (pos = head, n = (pos ? pos->next : NULL); pos; \
pos = n, n = (n ? n->next : NULL))
/*
* some handy macros that will probably be of use in more than one
* output format: convert integers into little-endian byte packed
* format in memory
*/
#if X86_MEMORY
#define WRITECHAR(p,v) \
do { \
*(uint8_t *)(p) = (v); \
(p) += 1; \
} while (0)
#define WRITESHORT(p,v) \
do { \
*(uint16_t *)(p) = (v); \
(p) += 2; \
} while (0)
#define WRITELONG(p,v) \
do { \
*(uint32_t *)(p) = (v); \
(p) += 4; \
} while (0)
#define WRITEDLONG(p,v) \
do { \
*(uint64_t *)(p) = (v); \
(p) += 8; \
} while (0)
#define WRITEADDR(p,v,s) \
do { \
uint64_t _wa_v = (v); \
memcpy((p), &_wa_v, (s)); \
(p) += (s); \
} while (0)
#else /* !X86_MEMORY */
#define WRITECHAR(p,v) \
do { \
uint8_t *_wc_p = (uint8_t *)(p); \
uint8_t _wc_v = (v); \
_wc_p[0] = _wc_v; \
(p) = (void *)(_wc_p + 1); \
} while (0)
#define WRITESHORT(p,v) \
do { \
uint8_t *_ws_p = (uint8_t *)(p); \
uint16_t _ws_v = (v); \
_ws_p[0] = _ws_v; \
_ws_p[1] = _ws_v >> 8; \
(p) = (void *)(_ws_p + 2); \
} while (0)
#define WRITELONG(p,v) \
do { \
uint8_t *_wl_p = (uint8_t *)(p); \
uint32_t _wl_v = (v); \
_wl_p[0] = _wl_v; \
_wl_p[1] = _wl_v >> 8; \
_wl_p[2] = _wl_v >> 16; \
_wl_p[3] = _wl_v >> 24; \
(p) = (void *)(_wl_p + 4); \
} while (0)
#define WRITEDLONG(p,v) \
do { \
uint8_t *_wq_p = (uint8_t *)(p); \
uint64_t _wq_v = (v); \
_wq_p[0] = _wq_v; \
_wq_p[1] = _wq_v >> 8; \
_wq_p[2] = _wq_v >> 16; \
_wq_p[3] = _wq_v >> 24; \
_wq_p[4] = _wq_v >> 32; \
_wq_p[5] = _wq_v >> 40; \
_wq_p[6] = _wq_v >> 48; \
_wq_p[7] = _wq_v >> 56; \
(p) = (void *)(_wq_p + 8); \
} while (0)
#define WRITEADDR(p,v,s) \
do { \
int _wa_s = (s); \
uint64_t _wa_v = (v); \
while (_wa_s--) { \
WRITECHAR(p,_wa_v); \
_wa_v >>= 8; \
} \
} while(0)
#endif
/*
* and routines to do the same thing to a file
*/
#define fwriteint8_t(d,f) putc(d,f)
void fwriteint16_t(uint16_t data, FILE * fp);
void fwriteint32_t(uint32_t data, FILE * fp);
void fwriteint64_t(uint64_t data, FILE * fp);
void fwriteaddr(uint64_t data, int size, FILE * fp);
/*
* Binary search routine. Returns index into `array' of an entry
* matching `string', or <0 if no match. `array' is taken to
* contain `size' elements.
*
* bsi() is case sensitive, bsii() is case insensitive.
*/
int bsi(const char *string, const char **array, int size);
int bsii(const char *string, const char **array, int size);
char *src_set_fname(char *newname);
int32_t src_set_linnum(int32_t newline);
int32_t src_get_linnum(void);
/*
* src_get may be used if you simply want to know the source file and line.
* It is also used if you maintain private status about the source location
* It return 0 if the information was the same as the last time you
* checked, -1 if the name changed and (new-old) if just the line changed.
*/
int src_get(int32_t *xline, char **xname);
char *nasm_strcat(const char *one, const char *two);
const char *prefix_name(int);
#define ZERO_BUF_SIZE 4096
extern const uint8_t zero_buffer[ZERO_BUF_SIZE];
size_t fwritezero(size_t bytes, FILE *fp);
static inline bool overflow_general(int64_t value, int bytes)
{
int sbit = (bytes << 3) - 1;
int64_t vmax = ((int64_t)2 << sbit) - 1;
int64_t vmin = -((int64_t)1 << sbit);
return value < vmin || value > vmax;
}
static inline bool overflow_signed(int64_t value, int bytes)
{
int sbit = (bytes << 3) - 1;
int64_t vmax = ((int64_t)1 << sbit) - 1;
int64_t vmin = -((int64_t)1 << sbit);
return value < vmin || value > vmax;
}
static inline bool overflow_unsigned(int64_t value, int bytes)
{
int sbit = (bytes << 3) - 1;
int64_t vmax = ((int64_t)2 << sbit) - 1;
int64_t vmin = 0;
return value < vmin || value > vmax;
}
#endif
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