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util: Add ATTRIBUTE_RETURNS_NONNULL.

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Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
This commit is contained in:
Matt Turner
2016-05-13 13:17:02 -07:00
parent 40c6d54e76
commit 377ab2f2d7
3 changed files with 14 additions and 0 deletions
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1
configure.ac
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@@ -224,6 +224,7 @@ AX_GCC_FUNC_ATTRIBUTE([format])
AX_GCC_FUNC_ATTRIBUTE([malloc]) AX_GCC_FUNC_ATTRIBUTE([malloc])
AX_GCC_FUNC_ATTRIBUTE([packed]) AX_GCC_FUNC_ATTRIBUTE([packed])
AX_GCC_FUNC_ATTRIBUTE([pure]) AX_GCC_FUNC_ATTRIBUTE([pure])
AX_GCC_FUNC_ATTRIBUTE([returns_nonnull])
AX_GCC_FUNC_ATTRIBUTE([unused]) AX_GCC_FUNC_ATTRIBUTE([unused])
AX_GCC_FUNC_ATTRIBUTE([warn_unused_result]) AX_GCC_FUNC_ATTRIBUTE([warn_unused_result])

7
m4/ax_gcc_func_attribute.m4
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@@ -53,6 +53,7 @@
# optimize # optimize
# packed # packed
# pure # pure
# returns_nonnull
# unused # unused
# used # used
# visibility # visibility
@@ -76,6 +77,9 @@
#serial 2 #serial 2
# mattst88:
# Added support for returns_nonnull attribute
AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1]) AS_VAR_PUSHDEF([ac_var], [ax_cv_have_func_attribute_$1])
@@ -175,6 +179,9 @@ AC_DEFUN([AX_GCC_FUNC_ATTRIBUTE], [
[pure], [ [pure], [
int foo( void ) __attribute__(($1)); int foo( void ) __attribute__(($1));
], ],
[returns_nonnull], [
int *foo( void ) __attribute__(($1));
],
[unused], [ [unused], [
int foo( void ) __attribute__(($1)); int foo( void ) __attribute__(($1));
], ],

6
src/util/macros.h
View File

@@ -154,6 +154,12 @@ do { \
#define ATTRIBUTE_PURE #define ATTRIBUTE_PURE
#endif #endif
#ifdef HAVE_FUNC_ATTRIBUTE_RETURNS_NONNULL
#define ATTRIBUTE_RETURNS_NONNULL __attribute__((__returns_nonnull__))
#else
#define ATTRIBUTE_RETURNS_NONNULL
#endif
#ifdef __cplusplus #ifdef __cplusplus
/** /**
* Macro function that evaluates to true if T is a trivially * Macro function that evaluates to true if T is a trivially