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| author | Nick Mathewson <nickm@torproject.org> | 2017-12-04 15:18:13 -0500 |
|---|---|---|
| committer | Nick Mathewson <nickm@torproject.org> | 2017-12-08 14:47:19 -0500 |
| commit | 1d348989b08a3d3c50dfa2600a5e5e2f61fb2b4a (patch) | |
| tree | 45ad3b679f2265aebcdd6569be0b904fc5fe0de7 /src/common/util.h | |
| parent | db024adc90069ce9961f3993aba1b7372f09d77a (diff) | |
| download | tor-1d348989b08a3d3c50dfa2600a5e5e2f61fb2b4a.tar.gz tor-1d348989b08a3d3c50dfa2600a5e5e2f61fb2b4a.zip | |
Make tor_free only evaluate its input once (at least on gcc and clang)
Diffstat (limited to 'src/common/util.h')
| -rw-r--r-- | src/common/util.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/common/util.h b/src/common/util.h index 9ed11260dc..e85be57c07 100644 --- a/src/common/util.h +++ b/src/common/util.h @@ -80,12 +80,22 @@ extern int dmalloc_free(const char *file, const int line, void *pnt, * This is a macro. If you need a function pointer to release memory from * tor_malloc(), use tor_free_(). */ +#ifdef __GNUC__ +#define tor_free(p) STMT_BEGIN \ + typeof(&(p)) tor_free__tmpvar = &(p); \ + if (PREDICT_LIKELY((*tor_free__tmpvar)!=NULL)) { \ + raw_free(*tor_free__tmpvar); \ + *tor_free__tmpvar=NULL; \ + } \ + STMT_END +#else #define tor_free(p) STMT_BEGIN \ if (PREDICT_LIKELY((p)!=NULL)) { \ raw_free(p); \ (p)=NULL; \ } \ STMT_END +#endif #endif /* defined(USE_DMALLOC) */ #define tor_malloc(size) tor_malloc_(size DMALLOC_ARGS) |