Build MSVC safe_refcount in a separate compilation unit

Including windows.h in a globally included header gives all kinds of
issues. Move the MSVC implementation for safe_refcount back into a .cpp
file to prevent this from happening.

1 files changed, 169 insertions, 0 deletions

diff --git a/core/safe_refcount.cpp b/core/safe_refcount.cpp
new file mode 100644
index 0000000000..c9acdb7970
--- /dev/null
+++ b/core/safe_refcount.cpp
@@ -0,0 +1,169 @@
+/*************************************************************************/
+/*  safe_refcount.cpp                                                    */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2017 Godot Engine contributors (cf. AUTHORS.md)    */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#include "safe_refcount.h"
+
+#if defined(_MSC_VER)
+
+/* Implementation for MSVC-Windows */
+
+// don't pollute my namespace!
+#include <windows.h>
+
+#define ATOMIC_CONDITIONAL_INCREMENT_BODY(m_pw, m_win_type, m_win_cmpxchg, m_cpp_type) \
+	/* try to increment until it actually works */                                     \
+	/* taken from boost */                                                             \
+	while (true) {                                                                     \
+		m_cpp_type tmp = static_cast<m_cpp_type const volatile &>(*(m_pw));            \
+		if (tmp == 0)                                                                  \
+			return 0; /* if zero, can't add to it anymore */                           \
+		if (m_win_cmpxchg((m_win_type volatile *)(m_pw), tmp + 1, tmp) == tmp)         \
+			return tmp + 1;                                                            \
+	}
+
+#define ATOMIC_EXCHANGE_IF_GREATER_BODY(m_pw, m_val, m_win_type, m_win_cmpxchg, m_cpp_type) \
+	while (true) {                                                                          \
+		m_cpp_type tmp = static_cast<m_cpp_type const volatile &>(*(m_pw));                 \
+		if (tmp >= m_val)                                                                   \
+			return tmp; /* already greater, or equal */                                     \
+		if (m_win_cmpxchg((m_win_type volatile *)(m_pw), m_val, tmp) == tmp)                \
+			return m_val;                                                                   \
+	}
+
+_ALWAYS_INLINE_ uint32_t _atomic_conditional_increment_impl(register uint32_t *pw) {
+
+	ATOMIC_CONDITIONAL_INCREMENT_BODY(pw, LONG, InterlockedCompareExchange, uint32_t)
+}
+
+_ALWAYS_INLINE_ uint32_t _atomic_decrement_impl(register uint32_t *pw) {
+
+	return InterlockedDecrement((LONG volatile *)pw);
+}
+
+_ALWAYS_INLINE_ uint32_t _atomic_increment_impl(register uint32_t *pw) {
+
+	return InterlockedIncrement((LONG volatile *)pw);
+}
+
+_ALWAYS_INLINE_ uint32_t _atomic_sub_impl(register uint32_t *pw, register uint32_t val) {
+
+	return InterlockedExchangeAdd((LONG volatile *)pw, -(int32_t)val) - val;
+}
+
+_ALWAYS_INLINE_ uint32_t _atomic_add_impl(register uint32_t *pw, register uint32_t val) {
+
+	return InterlockedAdd((LONG volatile *)pw, val);
+}
+
+_ALWAYS_INLINE_ uint32_t _atomic_exchange_if_greater_impl(register uint32_t *pw, register uint32_t val) {
+
+	ATOMIC_EXCHANGE_IF_GREATER_BODY(pw, val, LONG, InterlockedCompareExchange, uint32_t)
+}
+
+_ALWAYS_INLINE_ uint64_t _atomic_conditional_increment_impl(register uint64_t *pw) {
+
+	ATOMIC_CONDITIONAL_INCREMENT_BODY(pw, LONGLONG, InterlockedCompareExchange64, uint64_t)
+}
+
+_ALWAYS_INLINE_ uint64_t _atomic_decrement_impl(register uint64_t *pw) {
+
+	return InterlockedDecrement64((LONGLONG volatile *)pw);
+}
+
+_ALWAYS_INLINE_ uint64_t _atomic_increment_impl(register uint64_t *pw) {
+
+	return InterlockedIncrement64((LONGLONG volatile *)pw);
+}
+
+_ALWAYS_INLINE_ uint64_t _atomic_sub_impl(register uint64_t *pw, register uint64_t val) {
+
+	return InterlockedExchangeAdd64((LONGLONG volatile *)pw, -(int64_t)val) - val;
+}
+
+_ALWAYS_INLINE_ uint64_t _atomic_add_impl(register uint64_t *pw, register uint64_t val) {
+
+	return InterlockedAdd64((LONGLONG volatile *)pw, val);
+}
+
+_ALWAYS_INLINE_ uint64_t _atomic_exchange_if_greater_impl(register uint64_t *pw, register uint64_t val) {
+
+	ATOMIC_EXCHANGE_IF_GREATER_BODY(pw, val, LONGLONG, InterlockedCompareExchange64, uint64_t)
+}
+
+// The actual advertised functions; they'll call the right implementation
+
+uint32_t atomic_conditional_increment(register uint32_t *counter) {
+	return _atomic_conditional_increment_impl(counter);
+}
+
+uint32_t atomic_decrement(register uint32_t *pw) {
+	return _atomic_decrement_impl(pw);
+}
+
+uint32_t atomic_increment(register uint32_t *pw) {
+	return _atomic_increment_impl(pw);
+}
+
+uint32_t atomic_sub(register uint32_t *pw, register uint32_t val) {
+	return _atomic_sub_impl(pw, val);
+}
+
+uint32_t atomic_add(register uint32_t *pw, register uint32_t val) {
+	return _atomic_add_impl(pw, val);
+}
+
+uint32_t atomic_exchange_if_greater(register uint32_t *pw, register uint32_t val) {
+	return _atomic_exchange_if_greater_impl(pw, val);
+}
+
+uint64_t atomic_conditional_increment(register uint64_t *counter) {
+	return _atomic_conditional_increment_impl(counter);
+}
+
+uint64_t atomic_decrement(register uint64_t *pw) {
+	return _atomic_decrement_impl(pw);
+}
+
+uint64_t atomic_increment(register uint64_t *pw) {
+	return _atomic_increment_impl(pw);
+}
+
+uint64_t atomic_sub(register uint64_t *pw, register uint64_t val) {
+	return _atomic_sub_impl(pw, val);
+}
+
+uint64_t atomic_add(register uint64_t *pw, register uint64_t val) {
+	return _atomic_add_impl(pw, val);
+}
+
+uint64_t atomic_exchange_if_greater(register uint64_t *pw, register uint64_t val) {
+	return _atomic_exchange_if_greater_impl(pw, val);
+}
+#endif