src/third_party/protobuf/src/google/protobuf/stubs/atomicops_internals_arm64_gcc.h - cobalt - Git at Google

 // Protocol Buffers - Google's data interchange format
 // Copyright 2012 Google Inc.  All rights reserved.
 // https://developers.google.com/protocol-buffers/
 //
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
 // in the documentation and/or other materials provided with the
 // distribution.
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 // This file is an internal atomic implementation, use atomicops.h instead.

 #ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
 #define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_

 namespace google {
 namespace protobuf {
 namespace internal {

 inline void MemoryBarrier() {
   __asm__ __volatile__ ("dmb ish" ::: "memory");  // NOLINT
 }

 // NoBarrier versions of the operation include "memory" in the clobber list.
 // This is not required for direct usage of the NoBarrier versions of the
 // operations. However this is required for correctness when they are used as
 // part of the Acquire or Release versions, to ensure that nothing from outside
 // the call is reordered between the operation and the memory barrier. This does
 // not change the code generated, so has no or minimal impact on the
 // NoBarrier operations.

 inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
                                          Atomic32 old_value,
                                          Atomic32 new_value) {
   Atomic32 prev;
   int32_t temp;

   __asm__ __volatile__ (  // NOLINT
     "0:                                    \n\t"
     "ldxr %w[prev], %[ptr]                 \n\t"  // Load the previous value.
     "cmp %w[prev], %w[old_value]           \n\t"
     "bne 1f                                \n\t"
     "stxr %w[temp], %w[new_value], %[ptr]  \n\t"  // Try to store the new value.
     "cbnz %w[temp], 0b                     \n\t"  // Retry if it did not work.
     "1:                                    \n\t"
     : [prev]"=&r" (prev),
       [temp]"=&r" (temp),
       [ptr]"+Q" (*ptr)
     : [old_value]"IJr" (old_value),
       [new_value]"r" (new_value)
     : "cc", "memory"
   );  // NOLINT

   return prev;
 }

 inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
                                          Atomic32 new_value) {
   Atomic32 result;
   int32_t temp;

   __asm__ __volatile__ (  // NOLINT
     "0:                                    \n\t"
     "ldxr %w[result], %[ptr]               \n\t"  // Load the previous value.
     "stxr %w[temp], %w[new_value], %[ptr]  \n\t"  // Try to store the new value.
     "cbnz %w[temp], 0b                     \n\t"  // Retry if it did not work.
     : [result]"=&r" (result),
       [temp]"=&r" (temp),
       [ptr]"+Q" (*ptr)
     : [new_value]"r" (new_value)
     : "memory"
   );  // NOLINT

   return result;
 }

 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
                                           Atomic32 increment) {
   Atomic32 result;
   int32_t temp;

   __asm__ __volatile__ (  // NOLINT
     "0:                                       \n\t"
     "ldxr %w[result], %[ptr]                  \n\t"  // Load the previous value.
     "add %w[result], %w[result], %w[increment]\n\t"
     "stxr %w[temp], %w[result], %[ptr]        \n\t"  // Try to store the result.
     "cbnz %w[temp], 0b                        \n\t"  // Retry on failure.
     : [result]"=&r" (result),
       [temp]"=&r" (temp),
       [ptr]"+Q" (*ptr)
     : [increment]"IJr" (increment)
     : "memory"
   );  // NOLINT

   return result;
 }

 inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
                                         Atomic32 increment) {
   MemoryBarrier();
   Atomic32 result = NoBarrier_AtomicIncrement(ptr, increment);
   MemoryBarrier();

   return result;
 }

 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
                                        Atomic32 old_value,
                                        Atomic32 new_value) {
   Atomic32 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
   MemoryBarrier();

   return prev;
 }

 inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
                                        Atomic32 old_value,
                                        Atomic32 new_value) {
   MemoryBarrier();
   Atomic32 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);

   return prev;
 }

 inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
   *ptr = value;
 }

 inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
   *ptr = value;
   MemoryBarrier();
 }

 inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
   __asm__ __volatile__ (  // NOLINT
     "stlr %w[value], %[ptr]  \n\t"
     : [ptr]"=Q" (*ptr)
     : [value]"r" (value)
     : "memory"
   );  // NOLINT
 }

 inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
   return *ptr;
 }

 inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
   Atomic32 value;

   __asm__ __volatile__ (  // NOLINT
     "ldar %w[value], %[ptr]  \n\t"
     : [value]"=r" (value)
     : [ptr]"Q" (*ptr)
     : "memory"
   );  // NOLINT

   return value;
 }

 inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
   MemoryBarrier();
   return *ptr;
 }

 // 64-bit versions of the operations.
 // See the 32-bit versions for comments.

 inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
                                          Atomic64 old_value,
                                          Atomic64 new_value) {
   Atomic64 prev;
   int32_t temp;

   __asm__ __volatile__ (  // NOLINT
     "0:                                    \n\t"
     "ldxr %[prev], %[ptr]                  \n\t"
     "cmp %[prev], %[old_value]             \n\t"
     "bne 1f                                \n\t"
     "stxr %w[temp], %[new_value], %[ptr]   \n\t"
     "cbnz %w[temp], 0b                     \n\t"
     "1:                                    \n\t"
     : [prev]"=&r" (prev),
       [temp]"=&r" (temp),
       [ptr]"+Q" (*ptr)
     : [old_value]"IJr" (old_value),
       [new_value]"r" (new_value)
     : "cc", "memory"
   );  // NOLINT

   return prev;
 }

 inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
                                          Atomic64 new_value) {
   Atomic64 result;
   int32_t temp;

   __asm__ __volatile__ (  // NOLINT
     "0:                                    \n\t"
     "ldxr %[result], %[ptr]                \n\t"
     "stxr %w[temp], %[new_value], %[ptr]   \n\t"
     "cbnz %w[temp], 0b                     \n\t"
     : [result]"=&r" (result),
       [temp]"=&r" (temp),
       [ptr]"+Q" (*ptr)
     : [new_value]"r" (new_value)
     : "memory"
   );  // NOLINT

   return result;
 }

 inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
                                           Atomic64 increment) {
   Atomic64 result;
   int32_t temp;

   __asm__ __volatile__ (  // NOLINT
     "0:                                     \n\t"
     "ldxr %[result], %[ptr]                 \n\t"
     "add %[result], %[result], %[increment] \n\t"
     "stxr %w[temp], %[result], %[ptr]       \n\t"
     "cbnz %w[temp], 0b                      \n\t"
     : [result]"=&r" (result),
       [temp]"=&r" (temp),
       [ptr]"+Q" (*ptr)
     : [increment]"IJr" (increment)
     : "memory"
   );  // NOLINT

   return result;
 }

 inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
                                         Atomic64 increment) {
   MemoryBarrier();
   Atomic64 result = NoBarrier_AtomicIncrement(ptr, increment);
   MemoryBarrier();

   return result;
 }

 inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
                                        Atomic64 old_value,
                                        Atomic64 new_value) {
   Atomic64 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
   MemoryBarrier();

   return prev;
 }

 inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
                                        Atomic64 old_value,
                                        Atomic64 new_value) {
   MemoryBarrier();
   Atomic64 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);

   return prev;
 }

 inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
   *ptr = value;
 }

 inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
   *ptr = value;
   MemoryBarrier();
 }

 inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
   __asm__ __volatile__ (  // NOLINT
     "stlr %x[value], %[ptr]  \n\t"
     : [ptr]"=Q" (*ptr)
     : [value]"r" (value)
     : "memory"
   );  // NOLINT
 }

 inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
   return *ptr;
 }

 inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
   Atomic64 value;

   __asm__ __volatile__ (  // NOLINT
     "ldar %x[value], %[ptr]  \n\t"
     : [value]"=r" (value)
     : [ptr]"Q" (*ptr)
     : "memory"
   );  // NOLINT

   return value;
 }

 inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
   MemoryBarrier();
   return *ptr;
 }

 }  // namespace internal
 }  // namespace protobuf
 }  // namespace google

 #endif  // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
	// Protocol Buffers - Google's data interchange format
	// Copyright 2012 Google Inc. All rights reserved.
	// https://developers.google.com/protocol-buffers/
	//
	// Redistribution and use in source and binary forms, with or without
	// modification, are permitted provided that the following conditions are
	// met:
	//
	// * Redistributions of source code must retain the above copyright
	// notice, this list of conditions and the following disclaimer.
	// * Redistributions in binary form must reproduce the above
	// copyright notice, this list of conditions and the following disclaimer
	// in the documentation and/or other materials provided with the
	// distribution.
	// * Neither the name of Google Inc. nor the names of its
	// contributors may be used to endorse or promote products derived from
	// this software without specific prior written permission.
	//
	// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
	// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
	// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
	// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
	// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
	// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
	// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
	// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
	// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

	// This file is an internal atomic implementation, use atomicops.h instead.

	#ifndef GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_
	#define GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_

	namespace google {
	namespace protobuf {
	namespace internal {

	inline void MemoryBarrier() {
	__asm__ __volatile__ ("dmb ish" ::: "memory"); // NOLINT
	}

	// NoBarrier versions of the operation include "memory" in the clobber list.
	// This is not required for direct usage of the NoBarrier versions of the
	// operations. However this is required for correctness when they are used as
	// part of the Acquire or Release versions, to ensure that nothing from outside
	// the call is reordered between the operation and the memory barrier. This does
	// not change the code generated, so has no or minimal impact on the
	// NoBarrier operations.

	inline Atomic32 NoBarrier_CompareAndSwap(volatile Atomic32* ptr,
	Atomic32 old_value,
	Atomic32 new_value) {
	Atomic32 prev;
	int32_t temp;

	__asm__ __volatile__ ( // NOLINT
	"0: \n\t"
	"ldxr %w[prev], %[ptr] \n\t" // Load the previous value.
	"cmp %w[prev], %w[old_value] \n\t"
	"bne 1f \n\t"
	"stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value.
	"cbnz %w[temp], 0b \n\t" // Retry if it did not work.
	"1: \n\t"
	: [prev]"=&r" (prev),
	[temp]"=&r" (temp),
	[ptr]"+Q" (*ptr)
	: [old_value]"IJr" (old_value),
	[new_value]"r" (new_value)
	: "cc", "memory"
	); // NOLINT

	return prev;
	}

	inline Atomic32 NoBarrier_AtomicExchange(volatile Atomic32* ptr,
	Atomic32 new_value) {
	Atomic32 result;
	int32_t temp;

	__asm__ __volatile__ ( // NOLINT
	"0: \n\t"
	"ldxr %w[result], %[ptr] \n\t" // Load the previous value.
	"stxr %w[temp], %w[new_value], %[ptr] \n\t" // Try to store the new value.
	"cbnz %w[temp], 0b \n\t" // Retry if it did not work.
	: [result]"=&r" (result),
	[temp]"=&r" (temp),
	[ptr]"+Q" (*ptr)
	: [new_value]"r" (new_value)
	: "memory"
	); // NOLINT

	return result;
	}

	inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
	Atomic32 increment) {
	Atomic32 result;
	int32_t temp;

	__asm__ __volatile__ ( // NOLINT
	"0: \n\t"
	"ldxr %w[result], %[ptr] \n\t" // Load the previous value.
	"add %w[result], %w[result], %w[increment]\n\t"
	"stxr %w[temp], %w[result], %[ptr] \n\t" // Try to store the result.
	"cbnz %w[temp], 0b \n\t" // Retry on failure.
	: [result]"=&r" (result),
	[temp]"=&r" (temp),
	[ptr]"+Q" (*ptr)
	: [increment]"IJr" (increment)
	: "memory"
	); // NOLINT

	return result;
	}

	inline Atomic32 Barrier_AtomicIncrement(volatile Atomic32* ptr,
	Atomic32 increment) {
	MemoryBarrier();
	Atomic32 result = NoBarrier_AtomicIncrement(ptr, increment);
	MemoryBarrier();

	return result;
	}

	inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
	Atomic32 old_value,
	Atomic32 new_value) {
	Atomic32 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
	MemoryBarrier();

	return prev;
	}

	inline Atomic32 Release_CompareAndSwap(volatile Atomic32* ptr,
	Atomic32 old_value,
	Atomic32 new_value) {
	MemoryBarrier();
	Atomic32 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);

	return prev;
	}

	inline void NoBarrier_Store(volatile Atomic32* ptr, Atomic32 value) {
	*ptr = value;
	}

	inline void Acquire_Store(volatile Atomic32* ptr, Atomic32 value) {
	*ptr = value;
	MemoryBarrier();
	}

	inline void Release_Store(volatile Atomic32* ptr, Atomic32 value) {
	__asm__ __volatile__ ( // NOLINT
	"stlr %w[value], %[ptr] \n\t"
	: [ptr]"=Q" (*ptr)
	: [value]"r" (value)
	: "memory"
	); // NOLINT
	}

	inline Atomic32 NoBarrier_Load(volatile const Atomic32* ptr) {
	return *ptr;
	}

	inline Atomic32 Acquire_Load(volatile const Atomic32* ptr) {
	Atomic32 value;

	__asm__ __volatile__ ( // NOLINT
	"ldar %w[value], %[ptr] \n\t"
	: [value]"=r" (value)
	: [ptr]"Q" (*ptr)
	: "memory"
	); // NOLINT

	return value;
	}

	inline Atomic32 Release_Load(volatile const Atomic32* ptr) {
	MemoryBarrier();
	return *ptr;
	}

	// 64-bit versions of the operations.
	// See the 32-bit versions for comments.

	inline Atomic64 NoBarrier_CompareAndSwap(volatile Atomic64* ptr,
	Atomic64 old_value,
	Atomic64 new_value) {
	Atomic64 prev;
	int32_t temp;

	__asm__ __volatile__ ( // NOLINT
	"0: \n\t"
	"ldxr %[prev], %[ptr] \n\t"
	"cmp %[prev], %[old_value] \n\t"
	"bne 1f \n\t"
	"stxr %w[temp], %[new_value], %[ptr] \n\t"
	"cbnz %w[temp], 0b \n\t"
	"1: \n\t"
	: [prev]"=&r" (prev),
	[temp]"=&r" (temp),
	[ptr]"+Q" (*ptr)
	: [old_value]"IJr" (old_value),
	[new_value]"r" (new_value)
	: "cc", "memory"
	); // NOLINT

	return prev;
	}

	inline Atomic64 NoBarrier_AtomicExchange(volatile Atomic64* ptr,
	Atomic64 new_value) {
	Atomic64 result;
	int32_t temp;

	__asm__ __volatile__ ( // NOLINT
	"0: \n\t"
	"ldxr %[result], %[ptr] \n\t"
	"stxr %w[temp], %[new_value], %[ptr] \n\t"
	"cbnz %w[temp], 0b \n\t"
	: [result]"=&r" (result),
	[temp]"=&r" (temp),
	[ptr]"+Q" (*ptr)
	: [new_value]"r" (new_value)
	: "memory"
	); // NOLINT

	return result;
	}

	inline Atomic64 NoBarrier_AtomicIncrement(volatile Atomic64* ptr,
	Atomic64 increment) {
	Atomic64 result;
	int32_t temp;

	__asm__ __volatile__ ( // NOLINT
	"0: \n\t"
	"ldxr %[result], %[ptr] \n\t"
	"add %[result], %[result], %[increment] \n\t"
	"stxr %w[temp], %[result], %[ptr] \n\t"
	"cbnz %w[temp], 0b \n\t"
	: [result]"=&r" (result),
	[temp]"=&r" (temp),
	[ptr]"+Q" (*ptr)
	: [increment]"IJr" (increment)
	: "memory"
	); // NOLINT

	return result;
	}

	inline Atomic64 Barrier_AtomicIncrement(volatile Atomic64* ptr,
	Atomic64 increment) {
	MemoryBarrier();
	Atomic64 result = NoBarrier_AtomicIncrement(ptr, increment);
	MemoryBarrier();

	return result;
	}

	inline Atomic64 Acquire_CompareAndSwap(volatile Atomic64* ptr,
	Atomic64 old_value,
	Atomic64 new_value) {
	Atomic64 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);
	MemoryBarrier();

	return prev;
	}

	inline Atomic64 Release_CompareAndSwap(volatile Atomic64* ptr,
	Atomic64 old_value,
	Atomic64 new_value) {
	MemoryBarrier();
	Atomic64 prev = NoBarrier_CompareAndSwap(ptr, old_value, new_value);

	return prev;
	}

	inline void NoBarrier_Store(volatile Atomic64* ptr, Atomic64 value) {
	*ptr = value;
	}

	inline void Acquire_Store(volatile Atomic64* ptr, Atomic64 value) {
	*ptr = value;
	MemoryBarrier();
	}

	inline void Release_Store(volatile Atomic64* ptr, Atomic64 value) {
	__asm__ __volatile__ ( // NOLINT
	"stlr %x[value], %[ptr] \n\t"
	: [ptr]"=Q" (*ptr)
	: [value]"r" (value)
	: "memory"
	); // NOLINT
	}

	inline Atomic64 NoBarrier_Load(volatile const Atomic64* ptr) {
	return *ptr;
	}

	inline Atomic64 Acquire_Load(volatile const Atomic64* ptr) {
	Atomic64 value;

	__asm__ __volatile__ ( // NOLINT
	"ldar %x[value], %[ptr] \n\t"
	: [value]"=r" (value)
	: [ptr]"Q" (*ptr)
	: "memory"
	); // NOLINT

	return value;
	}

	inline Atomic64 Release_Load(volatile const Atomic64* ptr) {
	MemoryBarrier();
	return *ptr;
	}

	} // namespace internal
	} // namespace protobuf
	} // namespace google

	#endif // GOOGLE_PROTOBUF_ATOMICOPS_INTERNALS_ARM64_GCC_H_