st/glsl_to_tgsi: reduce stack explosion in recursive expression visitor

[mesa.git] / src / util / macros.h

diff --git a/src/util/macros.h b/src/util/macros.h
index ff37a7d63e6dce4ab660524d114703f5cd4965ff..c0bfb15a47aa239b2621f7dc90c87b65bb51dd51 100644 (file)
--- a/src/util/macros.h
+++ b/src/util/macros.h
@@ -24,11 +24,19 @@
 #ifndef UTIL_MACROS_H
 #define UTIL_MACROS_H
 
+#include <assert.h>
+
+#include "c99_compat.h"
+
 /* Compute the size of an array */
 #ifndef ARRAY_SIZE
 #  define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
 #endif
 
+/* For compatibility with Clang's __has_builtin() */
+#ifndef __has_builtin
+#  define __has_builtin(x) 0
+#endif
 
 /**
  * __builtin_expect macros
@@ -69,26 +77,47 @@ do {                        \
    assert(!str);            \
    __builtin_unreachable(); \
 } while (0)
-#endif
-
-#ifndef unreachable
-#define unreachable(str)
+#elif defined (_MSC_VER)
+#define unreachable(str)    \
+do {                        \
+   assert(!str);            \
+   __assume(0);             \
+} while (0)
+#else
+#define unreachable(str) assert(!str)
 #endif
 
 /**
  * Assume macro. Useful for expressing our assumptions to the compiler,
  * typically for purposes of silencing warnings.
  */
-#ifdef HAVE___BUILTIN_UNREACHABLE
+#if __has_builtin(__builtin_assume)
+#define assume(expr)       \
+do {                       \
+   assert(expr);           \
+   __builtin_assume(expr); \
+} while (0)
+#elif defined HAVE___BUILTIN_UNREACHABLE
 #define assume(expr) ((expr) ? ((void) 0) \
                              : (assert(!"assumption failed"), \
                                 __builtin_unreachable()))
-#elif _MSC_VER >= 1200
+#elif defined (_MSC_VER)
 #define assume(expr) __assume(expr)
 #else
 #define assume(expr) assert(expr)
 #endif
 
+/* Attribute const is used for functions that have no effects other than their
+ * return value, and only rely on the argument values to compute the return
+ * value.  As a result, calls to it can be CSEed.  Note that using memory
+ * pointed to by the arguments is not allowed for const functions.
+ */
+#ifdef HAVE_FUNC_ATTRIBUTE_CONST
+#define ATTRIBUTE_CONST __attribute__((__const__))
+#else
+#define ATTRIBUTE_CONST
+#endif
+
 #ifdef HAVE_FUNC_ATTRIBUTE_FLATTEN
 #define FLATTEN __attribute__((__flatten__))
 #else
@@ -116,6 +145,15 @@ do {                        \
 #define PACKED
 #endif
 
+/* Attribute pure is used for functions that have no effects other than their
+ * return value.  As a result, calls to it can be dead code eliminated.
+ */
+#ifdef HAVE_FUNC_ATTRIBUTE_PURE
+#define ATTRIBUTE_PURE __attribute__((__pure__))
+#else
+#define ATTRIBUTE_PURE
+#endif
+
 #ifdef __cplusplus
 /**
  * Macro function that evaluates to true if T is a trivially
@@ -140,4 +178,49 @@ do {                        \
 #   endif
 #endif
 
+/**
+ * PUBLIC/USED macros
+ *
+ * If we build the library with gcc's -fvisibility=hidden flag, we'll
+ * use the PUBLIC macro to mark functions that are to be exported.
+ *
+ * We also need to define a USED attribute, so the optimizer doesn't
+ * inline a static function that we later use in an alias. - ajax
+ */
+#ifndef PUBLIC
+#  if defined(__GNUC__)
+#    define PUBLIC __attribute__((visibility("default")))
+#    define USED __attribute__((used))
+#  elif defined(_MSC_VER)
+#    define PUBLIC __declspec(dllexport)
+#    define USED
+#  else
+#    define PUBLIC
+#    define USED
+#  endif
+#endif
+
+#ifdef HAVE_FUNC_ATTRIBUTE_UNUSED
+#define UNUSED __attribute__((unused))
+#else
+#define UNUSED
+#endif
+
+#define MAYBE_UNUSED UNUSED
+
+#ifdef HAVE_FUNC_ATTRIBUTE_WARN_UNUSED_RESULT
+#define MUST_CHECK __attribute__((warn_unused_result))
+#else
+#define MUST_CHECK
+#endif
+
+#if defined(__GNUC__) || (defined(__SUNPRO_C) && (__SUNPRO_C >= 0x590))
+#define ATTRIBUTE_NOINLINE __attribute__((noinline))
+#else
+#define ATTRIBUTE_NOINLINE
+#endif
+
+/** Compute ceiling of integer quotient of A divided by B. */
+#define DIV_ROUND_UP( A, B )  ( (A) % (B) == 0 ? (A)/(B) : (A)/(B)+1 )
+
 #endif /* UTIL_MACROS_H */