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1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef RUNTIME_VM_ATOMIC_H_ | 5 #ifndef RUNTIME_VM_ATOMIC_H_ |
6 #define RUNTIME_VM_ATOMIC_H_ | 6 #define RUNTIME_VM_ATOMIC_H_ |
7 | 7 |
8 #include "platform/globals.h" | 8 #include "platform/globals.h" |
9 | 9 |
10 #include "vm/allocation.h" | 10 #include "vm/allocation.h" |
11 #include "vm/simulator.h" | |
12 | 11 |
13 namespace dart { | 12 namespace dart { |
14 | 13 |
15 class AtomicOperations : public AllStatic { | 14 class AtomicOperations : public AllStatic { |
16 public: | 15 public: |
17 // Atomically fetch the value at p and increment the value at p. | 16 // Atomically fetch the value at p and increment the value at p. |
18 // Returns the original value at p. | 17 // Returns the original value at p. |
19 // | |
20 // NOTE: Not to be used for any atomic operations involving memory locations | |
21 // that are accessed by generated code. | |
22 static uintptr_t FetchAndIncrement(uintptr_t* p); | 18 static uintptr_t FetchAndIncrement(uintptr_t* p); |
23 static intptr_t FetchAndIncrement(intptr_t* p); | 19 static intptr_t FetchAndIncrement(intptr_t* p); |
24 | 20 |
25 // Atomically increment the value at p by 'value'. | 21 // Atomically increment the value at p by 'value'. |
26 // | |
27 // NOTE: Not to be used for any atomic operations involving memory locations | |
28 // that are accessed by generated code. | |
29 static void IncrementBy(intptr_t* p, intptr_t value); | 22 static void IncrementBy(intptr_t* p, intptr_t value); |
30 static void IncrementInt64By(int64_t* p, int64_t value); | 23 static void IncrementInt64By(int64_t* p, int64_t value); |
31 | 24 |
32 // Atomically fetch the value at p and decrement the value at p. | 25 // Atomically fetch the value at p and decrement the value at p. |
33 // Returns the original value at p. | 26 // Returns the original value at p. |
34 // | |
35 // NOTE: Not to be used for any atomic operations involving memory locations | |
36 // that are accessed by generated code. | |
37 static uintptr_t FetchAndDecrement(uintptr_t* p); | 27 static uintptr_t FetchAndDecrement(uintptr_t* p); |
38 static intptr_t FetchAndDecrement(intptr_t* p); | 28 static intptr_t FetchAndDecrement(intptr_t* p); |
39 | 29 |
40 // Atomically decrement the value at p by 'value'. | 30 // Atomically decrement the value at p by 'value'. |
41 // | |
42 // NOTE: Not to be used for any atomic operations involving memory locations | |
43 // that are accessed by generated code. | |
44 static void DecrementBy(intptr_t* p, intptr_t value); | 31 static void DecrementBy(intptr_t* p, intptr_t value); |
45 | 32 |
46 // Atomically compare *ptr to old_value, and if equal, store new_value. | 33 // Atomically compare *ptr to old_value, and if equal, store new_value. |
47 // Returns the original value at ptr. | 34 // Returns the original value at ptr. |
48 // | |
49 // NOTE: OK to use with memory locations that are accessed by generated code | |
50 static uword CompareAndSwapWord(uword* ptr, uword old_value, uword new_value); | 35 static uword CompareAndSwapWord(uword* ptr, uword old_value, uword new_value); |
51 static uint32_t CompareAndSwapUint32(uint32_t* ptr, | 36 static uint32_t CompareAndSwapUint32(uint32_t* ptr, |
52 uint32_t old_value, | 37 uint32_t old_value, |
53 uint32_t new_value); | 38 uint32_t new_value); |
54 | 39 |
55 // Performs a load of a word from 'ptr', but without any guarantees about | 40 // Performs a load of a word from 'ptr', but without any guarantees about |
56 // memory order (i.e., no load barriers/fences). | 41 // memory order (i.e., no load barriers/fences). |
57 template <typename T> | 42 template <typename T> |
58 static T LoadRelaxed(T* ptr) { | 43 static T LoadRelaxed(T* ptr) { |
59 return *static_cast<volatile T*>(ptr); | 44 return *static_cast<volatile T*>(ptr); |
60 } | 45 } |
61 }; | 46 }; |
62 | 47 |
63 } // namespace dart | 48 } // namespace dart |
64 | 49 |
65 #if defined(USING_SIMULATOR) && !defined(TARGET_ARCH_DBC) | |
66 #define USING_SIMULATOR_ATOMICS | |
67 #endif | |
68 | |
69 #if defined(USING_SIMULATOR_ATOMICS) | |
70 // We need to use the simulator to ensure that atomic operations are observed | |
71 // both in C++ and in generated code if the simulator is active. | |
72 #include "vm/atomic_simulator.h" | |
73 #endif | |
74 | |
75 #if defined(HOST_OS_ANDROID) | 50 #if defined(HOST_OS_ANDROID) |
76 #include "vm/atomic_android.h" | 51 #include "vm/atomic_android.h" |
77 #elif defined(HOST_OS_FUCHSIA) | 52 #elif defined(HOST_OS_FUCHSIA) |
78 #include "vm/atomic_fuchsia.h" | 53 #include "vm/atomic_fuchsia.h" |
79 #elif defined(HOST_OS_LINUX) | 54 #elif defined(HOST_OS_LINUX) |
80 #include "vm/atomic_linux.h" | 55 #include "vm/atomic_linux.h" |
81 #elif defined(HOST_OS_MACOS) | 56 #elif defined(HOST_OS_MACOS) |
82 #include "vm/atomic_macos.h" | 57 #include "vm/atomic_macos.h" |
83 #elif defined(HOST_OS_WINDOWS) | 58 #elif defined(HOST_OS_WINDOWS) |
84 #include "vm/atomic_win.h" | 59 #include "vm/atomic_win.h" |
85 #else | 60 #else |
86 #error Unknown target os. | 61 #error Unknown target os. |
87 #endif | 62 #endif |
88 | 63 |
89 #endif // RUNTIME_VM_ATOMIC_H_ | 64 #endif // RUNTIME_VM_ATOMIC_H_ |
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