newlib,clang: implement __sync_* atomics for clang/llvm toolchain.
@@ -75,6 +75,24 @@ static portMUX_TYPE s_atomic_lock = portMUX_INITIALIZER_UNLOCKED;
#endif // SOC_CPU_CORES_NUM
+#ifdef __clang__
+// Clang doesn't allow to define "__sync_*" atomics. The workaround is to define function with name "__sync_*_builtin",
+// which implements "__sync_*" atomic functionality and use asm directive to set the value of symbol "__sync_*" to the name
+// of defined function.
+
+#define CLANG_ATOMIC_SUFFIX(name_) name_ ## _builtin
+#define CLANG_DECLARE_ALIAS(name_) \
+__asm__(".type " # name_ ", @function\n" \
+ ".global " #name_ "\n" \
+ ".equ " #name_ ", " #name_ "_builtin");
+
+#else // __clang__
+
+#define CLANG_ATOMIC_SUFFIX(name_) name_
+#define CLANG_DECLARE_ALIAS(name_)
+
+#endif // __clang__
+
#define ATOMIC_LOAD(n, type) type __atomic_load_ ## n (const type* mem, int memorder) \
{ \
unsigned state = _ATOMIC_ENTER_CRITICAL(); \
@@ -158,12 +176,14 @@ static portMUX_TYPE s_atomic_lock = portMUX_INITIALIZER_UNLOCKED;
return ret; \
}
-#define SYNC_FETCH_OP(op, n, type) type __sync_fetch_and_ ## op ##_ ## n (type* ptr, type value) \
+
+#define SYNC_FETCH_OP(op, n, type) type CLANG_ATOMIC_SUFFIX(__sync_fetch_and_ ## op ##_ ## n) (type* ptr, type value) \
{ \
return __atomic_fetch_ ## op ##_ ## n (ptr, value, __ATOMIC_SEQ_CST); \
-}
+} \
+CLANG_DECLARE_ALIAS( __sync_fetch_and_ ## op ##_ ## n )
-#define SYNC_BOOL_CMP_EXCHANGE(n, type) bool __sync_bool_compare_and_swap_ ## n (type *ptr, type oldval, type newval) \
+#define SYNC_BOOL_CMP_EXCHANGE(n, type) bool CLANG_ATOMIC_SUFFIX(__sync_bool_compare_and_swap_ ## n) (type *ptr, type oldval, type newval) \
{ \
bool ret = false; \
unsigned state = _ATOMIC_ENTER_CRITICAL(); \
@@ -173,9 +193,10 @@ static portMUX_TYPE s_atomic_lock = portMUX_INITIALIZER_UNLOCKED;
} \
_ATOMIC_EXIT_CRITICAL(state); \
return ret; \
-}
+} \
+CLANG_DECLARE_ALIAS( __sync_bool_compare_and_swap_ ## n )
-#define SYNC_VAL_CMP_EXCHANGE(n, type) type __sync_val_compare_and_swap_ ## n (type *ptr, type oldval, type newval) \
+#define SYNC_VAL_CMP_EXCHANGE(n, type) type CLANG_ATOMIC_SUFFIX(__sync_val_compare_and_swap_ ## n) (type *ptr, type oldval, type newval) \
{ \
unsigned state = _ATOMIC_ENTER_CRITICAL(); \
type ret = *ptr; \
@@ -184,7 +205,9 @@ static portMUX_TYPE s_atomic_lock = portMUX_INITIALIZER_UNLOCKED;
} \
_ATOMIC_EXIT_CRITICAL(state); \
return ret; \
-}
+} \
+CLANG_DECLARE_ALIAS( __sync_val_compare_and_swap_ ## n )
+
#if !HAS_ATOMICS_32
