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Add warn_unused_result attribute for memory-related functions in libiberty.

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2019-06-10  Martin Liska  <mliska@suse.cz>

	* ansidecl.h (ATTRIBUTE_WARN_UNUSED_RESULT): New macro.
	* libiberty.h (xmalloc): Use it.
	(xrealloc): Likewise.
	(xcalloc): Likewise.
	(xstrdup): Likewise.
	(xstrndup): Likewise.
	(xmemdup): Likewise.

From-SVN: r272110
This commit is contained in:
Martin Liska 2019-06-10 09:42:43 +02:00 committed by Martin Liska
parent 3bb0dcb6c0
commit de1ee900b0
3 changed files with 25 additions and 6 deletions
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10
include/ChangeLog
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@ -1,3 +1,13 @@
2019-06-10 Martin Liska <mliska@suse.cz>
* ansidecl.h (ATTRIBUTE_WARN_UNUSED_RESULT): New macro.
* libiberty.h (xmalloc): Use it.
(xrealloc): Likewise.
(xcalloc): Likewise.
(xstrdup): Likewise.
(xstrndup): Likewise.
(xmemdup): Likewise.
2019-06-10 Martin Liska <mliska@suse.cz>
* ansidecl.h:

9
include/ansidecl.h
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@ -317,6 +317,15 @@ So instead we use the macro below and test it against specific values. */
#endif
#endif
/* Attribute `warn_unused_result' was valid as of gcc 3.3. */
#ifndef ATTRIBUTE_WARN_UNUSED_RESULT
# if GCC_VERSION >= 3003
# define ATTRIBUTE_WARN_UNUSED_RESULT __attribute__ ((warn_unused_result))
# else
# define ATTRIBUTE_WARN_UNUSED_RESULT
# endif
#endif
/* We use __extension__ in some places to suppress -pedantic warnings
about GCC extensions. This feature didn't work properly before
gcc 2.8. */

12
include/libiberty.h
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@ -310,30 +310,30 @@ extern void xmalloc_failed (size_t) ATTRIBUTE_NORETURN;
message to stderr (using the name set by xmalloc_set_program_name,
if any) and then call xexit. */
extern void *xmalloc (size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_1;
extern void *xmalloc (size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_1 ATTRIBUTE_WARN_UNUSED_RESULT;
/* Reallocate memory without fail. This works like xmalloc. Note,
realloc type functions are not suitable for attribute malloc since
they may return the same address across multiple calls. */
extern void *xrealloc (void *, size_t) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_2;
extern void *xrealloc (void *, size_t) ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_2 ATTRIBUTE_WARN_UNUSED_RESULT;
/* Allocate memory without fail and set it to zero. This works like
xmalloc. */
extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_1_2;
extern void *xcalloc (size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_RESULT_SIZE_1_2 ATTRIBUTE_WARN_UNUSED_RESULT;
/* Copy a string into a memory buffer without fail. */
extern char *xstrdup (const char *) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
extern char *xstrdup (const char *) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_WARN_UNUSED_RESULT;
/* Copy at most N characters from string into a buffer without fail. */
extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
extern char *xstrndup (const char *, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_WARN_UNUSED_RESULT;
/* Copy an existing memory buffer to a new memory buffer without fail. */
extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL;
extern void *xmemdup (const void *, size_t, size_t) ATTRIBUTE_MALLOC ATTRIBUTE_RETURNS_NONNULL ATTRIBUTE_WARN_UNUSED_RESULT;
/* Physical memory routines. Return values are in BYTES. */
extern double physmem_total (void);