From 537b7695c26b9ad83ccc13b68c78a2fb27545d7e Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Tue, 24 Jun 2014 16:21:58 -0400
Subject: Fix some warnings found by clang.

---
 libdimension/compiler-internal.h | 45 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 42 insertions(+), 3 deletions(-)

(limited to 'libdimension/compiler-internal.h')

diff --git a/libdimension/compiler-internal.h b/libdimension/compiler-internal.h
index ffe8de3..8b35b4a 100644
--- a/libdimension/compiler-internal.h
+++ b/libdimension/compiler-internal.h
@@ -23,14 +23,26 @@
  * Internally-used compiler abstractions.
  */
 
-#include <stdbool.h>
+#include <stdalign.h>
 
+/**
+ * @def dmnsn_likely
+ * Indicate that a test is likely to succeed.
+ * @param test  The test to perform.
+ * @return The truth value of \p test.
+ */
+/**
+ * @def dmnsn_unlikely
+ * Indicate that a test is unlikely to succeed.
+ * @param test  The test to perform.
+ * @return The truth value of \p test.
+ */
 #ifdef DMNSN_PROFILE
   #define dmnsn_likely(test)                                      \
     dmnsn_expect(!!(test), true, DMNSN_FUNC, __FILE__, __LINE__)
   #define dmnsn_unlikely(test)                                    \
     dmnsn_expect(!!(test), false, DMNSN_FUNC, __FILE__, __LINE__)
-#elif defined(__GNUC__)
+#elif DMNSN_GNUC
   #define dmnsn_likely(test)   __builtin_expect(!!(test), true)
   #define dmnsn_unlikely(test) __builtin_expect(!!(test), false)
 #else
@@ -38,7 +50,24 @@
   #define dmnsn_unlikely(test) (!!(test))
 #endif
 
-#ifdef __GNUC__
+/**
+ * @def DMNSN_HOT
+ * Mark a function as a hot path.
+ */
+/**
+ * @def DMNSN_INTERNAL
+ * Mark a function as internal linkage.
+ */
+/**
+ * @def DMNSN_DESTRUCTOR
+ * Queue a function to run at program termination.
+ */
+/**
+ * @def DMNSN_LATE_DESTRUCTOR
+ * Queue a function to run at program termination, after those labeled
+ * DMNSN_DESTRUCTOR.
+ */
+#if DMNSN_GNUC
   #define DMNSN_HOT             __attribute__((hot))
   #define DMNSN_INTERNAL        __attribute__((visibility("hidden")))
   #define DMNSN_DESTRUCTOR      __attribute__((destructor(102)))
@@ -50,4 +79,14 @@
   #define DMNSN_LATE_DESTRUCTOR
 #endif
 
+/// Synonym for _Atomic that stdatomic.h doesn't define for some reason
 #define atomic _Atomic
+
+/// C11-compliant alloca variant
+#define DMNSN_ALLOCA(var, size) DMNSN_ALLOCA_IMPL(var, size, __LINE__)
+
+#define DMNSN_ALLOCA_IMPL(var, size, ctr) DMNSN_ALLOCA_IMPL2(var, size, ctr)
+
+#define DMNSN_ALLOCA_IMPL2(var, size, ctr)      \
+  alignas(max_align_t) char dmnsn_alloca##ctr[size];    \
+  var = (void *)dmnsn_alloca##ctr
-- 
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