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#ifndef _FIU_CODEGEN
#define _FIU_CODEGEN
#include <fiu.h> /* fiu_* */
#include <stdlib.h> /* NULL, random() */
/* Recursion counter, per-thread */
extern int __thread _fiu_called;
/* Get a symbol from libc */
void *libc_symbol(const char *symbol);
/* Record internally an error for a stream */
void set_ferror(void * stream);
/* Some compilers support constructor priorities. Since we don't rely on them,
* but use them for clarity purposes, use a macro so libfiu builds on systems
* where they're not supported.
* Compilers that are known to support constructor priorities:
* - GCC >= 4.3 on Linux
* - clang as of 2010-03-14
*/
#define _GCC_VERSION (__GNUC__ * 1000 + __GNUC_MINOR__ * 10)
#if \
( (defined __GNUC__) && _GCC_VERSION >= 4030 ) \
|| (defined __clang__)
#define constructor_attr(prio) __attribute__((constructor(prio)))
#else
#define NO_CONSTRUCTOR_PRIORITIES 1
#define constructor_attr(prio) __attribute__((constructor))
#endif
/* Useful macros for recursion and debugging */
#ifndef FIU_POSIX_TRACE
#define rec_inc() do { _fiu_called++; } while(0)
#define rec_dec() do { _fiu_called--; } while(0)
#define printd(...) do { } while(0)
#else
/* debug variants */
#include <stdio.h>
#include <unistd.h>
#define rec_inc() \
do { \
_fiu_called++; \
fprintf(stderr, "I: %d %s\n", _fiu_called, \
__FUNCTION__); \
fflush(stderr); \
} while (0)
#define rec_dec() \
do { \
_fiu_called--; \
fprintf(stderr, "D: %d %s\n", _fiu_called, \
__FUNCTION__); \
fflush(stderr); \
} while (0)
#define printd(...) \
do { \
if (_fiu_called) \
fprintf(stderr, "\t"); \
_fiu_called++; \
fprintf(stderr, "%6.6d ", getpid()); \
fprintf(stderr, "%s(): ", __FUNCTION__ ); \
fprintf(stderr, __VA_ARGS__); \
fflush(stderr); \
_fiu_called--; \
} while(0)
#endif
/*
* Wrapper generator macros
*/
/* Generates the init part of the wrapped function */
#define mkwrap_init(RTYPE, NAME, PARAMS, PARAMST) \
static __thread RTYPE (*_fiu_orig_##NAME) PARAMS = NULL; \
\
static __thread int _fiu_in_init_##NAME = 0; \
\
static void constructor_attr(201) _fiu_init_##NAME(void) \
{ \
rec_inc(); \
_fiu_in_init_##NAME++; \
\
_fiu_orig_##NAME = (RTYPE (*) PARAMST) \
libc_symbol(#NAME); \
\
_fiu_in_init_##NAME--; \
rec_dec(); \
}
/* Generates the definition part of the wrapped function. */
#define mkwrap_def(RTYPE, NAME, PARAMS) \
RTYPE NAME PARAMS \
{ \
RTYPE r; \
int fstatus;
/* Generate the first part of the body, which checks the recursion status */
#define mkwrap_body_called(NAME, PARAMSN, ON_ERR) \
if (_fiu_called) { \
if (_fiu_orig_##NAME == NULL) { \
if (_fiu_in_init_##NAME) { \
printd("fail on init\n"); \
return ON_ERR; \
} else { \
printd("get orig\n"); \
_fiu_init_##NAME(); \
} \
} \
printd("orig\n"); \
return (*_fiu_orig_##NAME) PARAMSN; \
} \
\
printd("fiu\n"); \
\
/* fiu_fail() may call anything */ \
rec_inc();
/* Generates the common top for most functions (init + def + body called) */
#define mkwrap_top(RTYPE, NAME, PARAMS, PARAMSN, PARAMST, ON_ERR) \
mkwrap_init(RTYPE, NAME, PARAMS, PARAMST) \
mkwrap_def(RTYPE, NAME, PARAMS) \
mkwrap_body_called(NAME, PARAMSN, ON_ERR)
/* Generates the body of the function for normal, non-errno usage. The return
* value is taken from failinfo. */
#define mkwrap_body_failinfo(FIU_NAME, RTYPE) \
\
fstatus = fiu_fail(FIU_NAME); \
if (fstatus != 0) { \
r = (RTYPE) fiu_failinfo(); \
printd("failing\n"); \
goto exit; \
}
/* Generates the body of the function for normal, non-errno usage. The return
* value is hardcoded. */
#define mkwrap_body_hardcoded(FIU_NAME, FAIL_RET) \
\
fstatus = fiu_fail(FIU_NAME); \
if (fstatus != 0) { \
r = FAIL_RET; \
printd("failing\n"); \
goto exit; \
}
/* Generates the body of the function for functions that affect errno. The
* return value is hardcoded. Assumes int valid_errnos[] exist was properly
* defined. */
#define mkwrap_body_errno(FIU_NAME, FAIL_RET) \
\
fstatus = fiu_fail(FIU_NAME); \
if (fstatus != 0) { \
void *finfo = fiu_failinfo(); \
if (finfo == NULL) { \
errno = valid_errnos[random() % \
sizeof(valid_errnos) / sizeof(int)]; \
} else { \
errno = (long) finfo; \
} \
r = FAIL_RET; \
printd("failing\n"); \
goto exit; \
}
/* As mkwrap_body_errno, but calls set_ferror for the given stream. */
#define mkwrap_body_errno_ferror(FIU_NAME, FAIL_RET, STREAM) \
\
fstatus = fiu_fail(FIU_NAME); \
if (fstatus != 0) { \
void *finfo = fiu_failinfo(); \
if (finfo == NULL) { \
errno = valid_errnos[random() % \
sizeof(valid_errnos) / sizeof(int)]; \
} else { \
errno = (long) finfo; \
} \
r = FAIL_RET; \
printd("failing\n"); \
set_ferror(STREAM); \
goto exit; \
}
/* Generates a body part that will reduce the CNT parameter in a random
* amount when the given point of failure is enabled. Can be combined with the
* other body generators. */
#define mkwrap_body_reduce(FIU_NAME, CNT) \
\
fstatus = fiu_fail(FIU_NAME); \
if (fstatus != 0) { \
printd("reducing\n"); \
CNT -= random() % CNT; \
}
#define mkwrap_bottom(NAME, PARAMSN) \
\
if (_fiu_orig_##NAME == NULL) \
_fiu_init_##NAME(); \
\
printd("calling orig\n"); \
r = (*_fiu_orig_##NAME) PARAMSN; \
\
exit: \
rec_dec(); \
return r; \
}
#endif /* _FIU_CODEGEN */
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