| 1 |
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| 2 | |
| 3 | * Macros and attributes for compiler-based static context analysis.
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| 4 |
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| 5 |
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| 6 | #ifndef _LINUX_COMPILER_CONTEXT_ANALYSIS_H
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| 7 | #define _LINUX_COMPILER_CONTEXT_ANALYSIS_H
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| 8 |
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| 9 | #if defined(WARN_CONTEXT_ANALYSIS) && !defined(__CHECKER__) && !defined(__GENKSYMS__)
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| 10 |
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| 11 | |
| 12 | * These attributes define new context lock (Clang: capability) types.
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| 13 | * Internal only.
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| 14 |
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| 15 | # define __ctx_lock_type(name) __attribute__((capability(#name)))
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| 16 | # define __reentrant_ctx_lock __attribute__((reentrant_capability))
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| 17 | # define __acquires_ctx_lock(...) __attribute__((acquire_capability(__VA_ARGS__)))
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| 18 | # define __acquires_shared_ctx_lock(...) __attribute__((acquire_shared_capability(__VA_ARGS__)))
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| 19 | # define __try_acquires_ctx_lock(ret, var) __attribute__((try_acquire_capability(ret, var)))
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| 20 | # define __try_acquires_shared_ctx_lock(ret, var) __attribute__((try_acquire_shared_capability(ret, var)))
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| 21 | # define __releases_ctx_lock(...) __attribute__((release_capability(__VA_ARGS__)))
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| 22 | # define __releases_shared_ctx_lock(...) __attribute__((release_shared_capability(__VA_ARGS__)))
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| 23 | # define __returns_ctx_lock(var) __attribute__((lock_returned(var)))
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| 24 |
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| 25 | |
| 26 | * The below are used to annotate code being checked. Internal only.
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| 27 |
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| 28 | # define __excludes_ctx_lock(...) __attribute__((locks_excluded(__VA_ARGS__)))
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| 29 | # define __requires_ctx_lock(...) __attribute__((requires_capability(__VA_ARGS__)))
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| 30 | # define __requires_shared_ctx_lock(...) __attribute__((requires_shared_capability(__VA_ARGS__)))
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| 31 |
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| 32 | |
| 33 | * The "assert_capability" attribute is a bit confusingly named. It does not
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| 34 | * generate a check. Instead, it tells the analysis to *assume* the capability
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| 35 | * is held. This is used for augmenting runtime assertions, that can then help
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| 36 | * with patterns beyond the compiler's static reasoning abilities.
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| 37 |
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| 38 | # define __assumes_ctx_lock(...) __attribute__((assert_capability(__VA_ARGS__)))
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| 39 | # define __assumes_shared_ctx_lock(...) __attribute__((assert_shared_capability(__VA_ARGS__)))
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| 40 |
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| 41 | |
| 42 | * __guarded_by() - struct member and globals attribute, declares variable
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| 43 | * only accessible within active context
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| 44 | * @...: context lock instance pointer(s)
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| 45 | *
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| 46 | * Declares that the struct member or global variable is only accessible within
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| 47 | * the context entered by the given context lock(s). Read operations on the data
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| 48 | * require shared access to at least one of the context locks, while write
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| 49 | * operations require exclusive access to all listed context locks.
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| 50 | *
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| 51 | * .. code-block:: c
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| 52 | *
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| 53 | * struct some_state {
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| 54 | * spinlock_t lock;
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| 55 | * long counter __guarded_by(&lock);
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| 56 | * };
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| 57 | *
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| 58 | * struct some_state {
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| 59 | * spinlock_t lock1, lock2;
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| 60 | * long counter __guarded_by(&lock1, &lock2);
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| 61 | * };
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| 62 |
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| 63 | # define __guarded_by(...) __attribute__((guarded_by(__VA_ARGS__)))
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| 64 |
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| 65 | |
| 66 | * __pt_guarded_by() - struct member and globals attribute, declares pointed-to
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| 67 | * data only accessible within active context
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| 68 | * @...: context lock instance pointer(s)
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| 69 | *
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| 70 | * Declares that the data pointed to by the struct member pointer or global
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| 71 | * pointer is only accessible within the context entered by the given context
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| 72 | * lock(s). Read operations on the data require shared access to at least one
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| 73 | * of the context locks, while write operations require exclusive access to all
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| 74 | * listed context locks.
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| 75 | *
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| 76 | * .. code-block:: c
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| 77 | *
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| 78 | * struct some_state {
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| 79 | * spinlock_t lock;
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| 80 | * long *counter __pt_guarded_by(&lock);
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| 81 | * };
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| 82 | *
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| 83 | * struct some_state {
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| 84 | * spinlock_t lock1, lock2;
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| 85 | * long *counter __pt_guarded_by(&lock1, &lock2);
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| 86 | * };
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| 87 |
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| 88 | # define __pt_guarded_by(...) __attribute__((pt_guarded_by(__VA_ARGS__)))
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| 89 |
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| 90 | |
| 91 | * context_lock_struct() - declare or define a context lock struct
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| 92 | * @name: struct name
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| 93 | *
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| 94 | * Helper to declare or define a struct type that is also a context lock.
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| 95 | *
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| 96 | * .. code-block:: c
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| 97 | *
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| 98 | * context_lock_struct(my_handle) {
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| 99 | * int foo;
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| 100 | * long bar;
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| 101 | * };
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| 102 | *
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| 103 | * struct some_state {
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| 104 | * ...
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| 105 | * };
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| 106 | * // ... declared elsewhere ...
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| 107 | * context_lock_struct(some_state);
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| 108 | *
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| 109 | * Note: The implementation defines several helper functions that can acquire
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| 110 | * and release the context lock.
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| 111 |
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| 112 | # define context_lock_struct(name, ...) \
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| 113 | struct __ctx_lock_type(name) __VA_ARGS__ name; \
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| 114 | static __always_inline void __acquire_ctx_lock(const struct name *var) \
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| 115 | __attribute__((overloadable)) __no_context_analysis __acquires_ctx_lock(var) { } \
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| 116 | static __always_inline void __acquire_shared_ctx_lock(const struct name *var) \
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| 117 | __attribute__((overloadable)) __no_context_analysis __acquires_shared_ctx_lock(var) { } \
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| 118 | static __always_inline bool __try_acquire_ctx_lock(const struct name *var, bool ret) \
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| 119 | __attribute__((overloadable)) __no_context_analysis __try_acquires_ctx_lock(1, var) \
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| 120 | { return ret; } \
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| 121 | static __always_inline bool __try_acquire_shared_ctx_lock(const struct name *var, bool ret) \
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| 122 | __attribute__((overloadable)) __no_context_analysis __try_acquires_shared_ctx_lock(1, var) \
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| 123 | { return ret; } \
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| 124 | static __always_inline void __release_ctx_lock(const struct name *var) \
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| 125 | __attribute__((overloadable)) __no_context_analysis __releases_ctx_lock(var) { } \
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| 126 | static __always_inline void __release_shared_ctx_lock(const struct name *var) \
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| 127 | __attribute__((overloadable)) __no_context_analysis __releases_shared_ctx_lock(var) { } \
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| 128 | static __always_inline void __assume_ctx_lock(const struct name *var) \
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| 129 | __attribute__((overloadable)) __assumes_ctx_lock(var) { } \
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| 130 | static __always_inline void __assume_shared_ctx_lock(const struct name *var) \
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| 131 | __attribute__((overloadable)) __assumes_shared_ctx_lock(var) { } \
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| 132 | struct name
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| 133 |
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| 134 | |
| 135 | * disable_context_analysis() - disables context analysis
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| 136 | *
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| 137 | * Disables context analysis. Must be paired with a later
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| 138 | * enable_context_analysis().
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| 139 |
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| 140 | # define disable_context_analysis() \
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| 141 | __diag_push(); \
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| 142 | __diag_ignore_all("-Wunknown-warning-option", "") \
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| 143 | __diag_ignore_all("-Wthread-safety", "") \
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| 144 | __diag_ignore_all("-Wthread-safety-pointer", "")
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| 145 |
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| 146 | |
| 147 | * enable_context_analysis() - re-enables context analysis
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| 148 | *
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| 149 | * Re-enables context analysis. Must be paired with a prior
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| 150 | * disable_context_analysis().
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| 151 |
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| 152 | # define enable_context_analysis() __diag_pop()
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| 153 |
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| 154 | |
| 155 | * __no_context_analysis - function attribute, disables context analysis
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| 156 | *
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| 157 | * Function attribute denoting that context analysis is disabled for the
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| 158 | * whole function. Prefer use of `context_unsafe()` where possible.
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| 159 |
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| 160 | # define __no_context_analysis __attribute__((no_thread_safety_analysis))
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| 161 |
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| 162 | #else
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| 163 |
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| 164 | # define __ctx_lock_type(name)
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| 165 | # define __reentrant_ctx_lock
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| 166 | # define __acquires_ctx_lock(...)
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| 167 | # define __acquires_shared_ctx_lock(...)
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| 168 | # define __try_acquires_ctx_lock(ret, var)
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| 169 | # define __try_acquires_shared_ctx_lock(ret, var)
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| 170 | # define __releases_ctx_lock(...)
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| 171 | # define __releases_shared_ctx_lock(...)
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| 172 | # define __assumes_ctx_lock(...)
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| 173 | # define __assumes_shared_ctx_lock(...)
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| 174 | # define __returns_ctx_lock(var)
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| 175 | # define __guarded_by(...)
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| 176 | # define __pt_guarded_by(...)
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| 177 | # define __excludes_ctx_lock(...)
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| 178 | # define __requires_ctx_lock(...)
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| 179 | # define __requires_shared_ctx_lock(...)
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| 180 | # define __acquire_ctx_lock(var) do { } while (0)
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| 181 | # define __acquire_shared_ctx_lock(var) do { } while (0)
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| 182 | # define __try_acquire_ctx_lock(var, ret) (ret)
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| 183 | # define __try_acquire_shared_ctx_lock(var, ret) (ret)
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| 184 | # define __release_ctx_lock(var) do { } while (0)
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| 185 | # define __release_shared_ctx_lock(var) do { } while (0)
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| 186 | # define __assume_ctx_lock(var) do { (void)(var); } while (0)
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| 187 | # define __assume_shared_ctx_lock(var) do { (void)(var); } while (0)
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| 188 | # define context_lock_struct(name, ...) struct __VA_ARGS__ name
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| 189 | # define disable_context_analysis()
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| 190 | # define enable_context_analysis()
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| 191 | # define __no_context_analysis
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| 192 |
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| 193 | #endif
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| 194 |
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| 195 | |
| 196 | * context_unsafe() - disable context checking for contained code
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| 197 | *
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| 198 | * Disables context checking for contained statements or expression.
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| 199 | *
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| 200 | * .. code-block:: c
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| 201 | *
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| 202 | * struct some_data {
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| 203 | * spinlock_t lock;
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| 204 | * int counter __guarded_by(&lock);
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| 205 | * };
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| 206 | *
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| 207 | * int foo(struct some_data *d)
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| 208 | * {
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| 209 | * // ...
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| 210 | * // other code that is still checked ...
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| 211 | * // ...
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| 212 | * return context_unsafe(d->counter);
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| 213 | * }
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| 214 |
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| 215 | #define context_unsafe(...) \
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| 216 | ({ \
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| 217 | disable_context_analysis(); \
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| 218 | __VA_ARGS__; \
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| 219 | enable_context_analysis() \
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| 220 | })
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| 221 |
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| 222 | |
| 223 | * __context_unsafe() - function attribute, disable context checking
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| 224 | * @comment: comment explaining why opt-out is safe
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| 225 | *
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| 226 | * Function attribute denoting that context analysis is disabled for the
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| 227 | * whole function. Forces adding an inline comment as argument.
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| 228 |
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| 229 | #define __context_unsafe(comment) __no_context_analysis
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| 230 |
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| 231 | |
| 232 | * context_unsafe_alias() - helper to insert a context lock "alias barrier"
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| 233 | * @p: pointer aliasing a context lock or object containing context locks
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| 234 | *
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| 235 | * No-op function that acts as a "context lock alias barrier", where the
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| 236 | * analysis rightfully detects that we're switching aliases, but the switch is
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| 237 | * considered safe but beyond the analysis reasoning abilities.
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| 238 | *
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| 239 | * This should be inserted before the first use of such an alias.
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| 240 | *
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| 241 | * Implementation Note: The compiler ignores aliases that may be reassigned but
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| 242 | * their value cannot be determined (e.g. when passing a non-const pointer to an
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| 243 | * alias as a function argument).
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| 244 |
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| 245 | #define context_unsafe_alias(p) _context_unsafe_alias((void **)&(p))
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| 246 | static inline void _context_unsafe_alias(void **p) { }
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| 247 |
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| 248 | |
| 249 | * token_context_lock() - declare an abstract global context lock instance
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| 250 | * @name: token context lock name
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| 251 | *
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| 252 | * Helper that declares an abstract global context lock instance @name, but not
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| 253 | * backed by a real data structure (linker error if accidentally referenced).
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| 254 | * The type name is `__ctx_lock_@name`.
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| 255 |
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| 256 | #define token_context_lock(name, ...) \
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| 257 | context_lock_struct(__ctx_lock_##name, ##__VA_ARGS__) {}; \
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| 258 | extern const struct __ctx_lock_##name *name
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| 259 |
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| 260 | |
| 261 | * token_context_lock_instance() - declare another instance of a global context lock
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| 262 | * @ctx: token context lock previously declared with token_context_lock()
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| 263 | * @name: name of additional global context lock instance
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| 264 | *
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| 265 | * Helper that declares an additional instance @name of the same token context
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| 266 | * lock class @ctx. This is helpful where multiple related token contexts are
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| 267 | * declared, to allow using the same underlying type (`__ctx_lock_@ctx`) as
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| 268 | * function arguments.
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| 269 |
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| 270 | #define token_context_lock_instance(ctx, name) \
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| 271 | extern const struct __ctx_lock_##ctx *name
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| 272 |
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| 273 | |
| 274 | * Common keywords for static context analysis.
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| 275 |
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| 276 |
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| 277 | |
| 278 | * __must_hold() - function attribute, caller must hold exclusive context lock
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| 279 | *
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| 280 | * Function attribute declaring that the caller must hold the given context
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| 281 | * lock instance(s) exclusively.
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| 282 |
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| 283 | #define __must_hold(...) __requires_ctx_lock(__VA_ARGS__)
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| 284 |
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| 285 | |
| 286 | * __must_not_hold() - function attribute, caller must not hold context lock
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| 287 | *
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| 288 | * Function attribute declaring that the caller must not hold the given context
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| 289 | * lock instance(s).
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| 290 |
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| 291 | #define __must_not_hold(...) __excludes_ctx_lock(__VA_ARGS__)
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| 292 |
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| 293 | |
| 294 | * __acquires() - function attribute, function acquires context lock exclusively
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| 295 | *
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| 296 | * Function attribute declaring that the function acquires the given context
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| 297 | * lock instance(s) exclusively, but does not release them.
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| 298 |
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| 299 | #define __acquires(...) __acquires_ctx_lock(__VA_ARGS__)
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| 300 |
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| 301 | |
| 302 | * Clang's analysis does not care precisely about the value, only that it is
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| 303 | * either zero or non-zero. So the __cond_acquires() interface might be
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| 304 | * misleading if we say that @ret is the value returned if acquired. Instead,
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| 305 | * provide symbolic variants which we translate.
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| 306 |
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| 307 | #define __cond_acquires_impl_true(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(1, x)
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| 308 | #define __cond_acquires_impl_false(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(0, x)
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| 309 | #define __cond_acquires_impl_nonzero(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(1, x)
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| 310 | #define __cond_acquires_impl_0(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(0, x)
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| 311 | #define __cond_acquires_impl_nonnull(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(1, x)
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| 312 | #define __cond_acquires_impl_NULL(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(0, x)
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| 313 |
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| 314 | |
| 315 | * __cond_acquires() - function attribute, function conditionally
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| 316 | * acquires a context lock exclusively
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| 317 | * @ret: abstract value returned by function if context lock acquired
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| 318 | * @x: context lock instance pointer
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| 319 | *
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| 320 | * Function attribute declaring that the function conditionally acquires the
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| 321 | * given context lock instance @x exclusively, but does not release it. The
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| 322 | * function return value @ret denotes when the context lock is acquired.
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| 323 | *
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| 324 | * @ret may be one of: true, false, nonzero, 0, nonnull, NULL.
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| 325 |
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| 326 | #define __cond_acquires(ret, x) __cond_acquires_impl_##ret(x)
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| 327 |
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| 328 | |
| 329 | * __releases() - function attribute, function releases a context lock exclusively
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| 330 | *
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| 331 | * Function attribute declaring that the function releases the given context
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| 332 | * lock instance(s) exclusively. The associated context(s) must be active on
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| 333 | * entry.
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| 334 |
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| 335 | #define __releases(...) __releases_ctx_lock(__VA_ARGS__)
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| 336 |
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| 337 | |
| 338 | * Clang's analysis does not care precisely about the value, only that it is
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| 339 | * either zero or non-zero. So the __cond_acquires() interface might be
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| 340 | * misleading if we say that @ret is the value returned if acquired. Instead,
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| 341 | * provide symbolic variants which we translate.
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| 342 |
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| 343 | #define __cond_acquires_impl_not_true(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(0, x)
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| 344 | #define __cond_acquires_impl_not_false(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(1, x)
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| 345 | #define __cond_acquires_impl_not_nonzero(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(0, x)
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| 346 | #define __cond_acquires_impl_not_0(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(1, x)
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| 347 | #define __cond_acquires_impl_not_nonnull(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(0, x)
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| 348 | #define __cond_acquires_impl_not_NULL(x, ...) __try_acquires##__VA_ARGS__##_ctx_lock(1, x)
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| 349 |
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| 350 | |
| 351 | * __cond_releases() - function attribute, function conditionally
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| 352 | * releases a context lock exclusively
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| 353 | * @ret: abstract value returned by function if context lock releases
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| 354 | * @x: context lock instance pointer
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| 355 | *
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| 356 | * Function attribute declaring that the function conditionally releases the
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| 357 | * given context lock instance @x exclusively. The associated context(s) must
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| 358 | * be active on entry. The function return value @ret denotes when the context
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| 359 | * lock is released.
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| 360 | *
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| 361 | * @ret may be one of: true, false, nonzero, 0, nonnull, NULL.
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| 362 | *
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| 363 | * NOTE: clang does not have a native attribute for this; instead implement
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| 364 | * it as an unconditional release and a conditional acquire for the
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| 365 | * inverted condition -- which is semantically equivalent.
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| 366 |
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| 367 | #define __cond_releases(ret, x) __releases(x) __cond_acquires_impl_not_##ret(x)
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| 368 |
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| 369 | |
| 370 | * __acquire() - function to acquire context lock exclusively
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| 371 | * @x: context lock instance pointer
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| 372 | *
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| 373 | * No-op function that acquires the given context lock instance @x exclusively.
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| 374 |
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| 375 | #define __acquire(x) __acquire_ctx_lock(x)
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| 376 |
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| 377 | |
| 378 | * __release() - function to release context lock exclusively
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| 379 | * @x: context lock instance pointer
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| 380 | *
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| 381 | * No-op function that releases the given context lock instance @x.
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| 382 |
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| 383 | #define __release(x) __release_ctx_lock(x)
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| 384 |
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| 385 | |
| 386 | * __must_hold_shared() - function attribute, caller must hold shared context lock
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| 387 | *
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| 388 | * Function attribute declaring that the caller must hold the given context
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| 389 | * lock instance(s) with shared access.
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| 390 |
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| 391 | #define __must_hold_shared(...) __requires_shared_ctx_lock(__VA_ARGS__)
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| 392 |
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| 393 | |
| 394 | * __acquires_shared() - function attribute, function acquires context lock shared
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| 395 | *
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| 396 | * Function attribute declaring that the function acquires the given
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| 397 | * context lock instance(s) with shared access, but does not release them.
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| 398 |
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| 399 | #define __acquires_shared(...) __acquires_shared_ctx_lock(__VA_ARGS__)
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| 400 |
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| 401 | |
| 402 | * __cond_acquires_shared() - function attribute, function conditionally
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| 403 | * acquires a context lock shared
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| 404 | * @ret: abstract value returned by function if context lock acquired
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| 405 | * @x: context lock instance pointer
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| 406 | *
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| 407 | * Function attribute declaring that the function conditionally acquires the
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| 408 | * given context lock instance @x with shared access, but does not release it.
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| 409 | * The function return value @ret denotes when the context lock is acquired.
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| 410 | *
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| 411 | * @ret may be one of: true, false, nonzero, 0, nonnull, NULL.
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| 412 |
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| 413 | #define __cond_acquires_shared(ret, x) __cond_acquires_impl_##ret(x, _shared)
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| 414 |
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| 415 | |
| 416 | * __releases_shared() - function attribute, function releases a
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| 417 | * context lock shared
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| 418 | *
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| 419 | * Function attribute declaring that the function releases the given context
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| 420 | * lock instance(s) with shared access. The associated context(s) must be
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| 421 | * active on entry.
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| 422 |
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| 423 | #define __releases_shared(...) __releases_shared_ctx_lock(__VA_ARGS__)
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| 424 |
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| 425 | |
| 426 | * __acquire_shared() - function to acquire context lock shared
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| 427 | * @x: context lock instance pointer
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| 428 | *
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| 429 | * No-op function that acquires the given context lock instance @x with shared
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| 430 | * access.
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| 431 |
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| 432 | #define __acquire_shared(x) __acquire_shared_ctx_lock(x)
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| 433 |
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| 434 | |
| 435 | * __release_shared() - function to release context lock shared
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| 436 | * @x: context lock instance pointer
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| 437 | *
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| 438 | * No-op function that releases the given context lock instance @x with shared
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| 439 | * access.
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| 440 |
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| 441 | #define __release_shared(x) __release_shared_ctx_lock(x)
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| 442 |
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| 443 | |
| 444 | * __acquire_ret() - helper to acquire context lock of return value
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| 445 | * @call: call expression
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| 446 | * @ret_expr: acquire expression that uses __ret
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| 447 |
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| 448 | #define __acquire_ret(call, ret_expr) \
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| 449 | ({ \
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| 450 | __auto_type __ret = call; \
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| 451 | __acquire(ret_expr); \
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| 452 | __ret; \
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| 453 | })
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| 454 |
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| 455 | |
| 456 | * __acquire_shared_ret() - helper to acquire context lock shared of return value
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| 457 | * @call: call expression
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| 458 | * @ret_expr: acquire shared expression that uses __ret
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| 459 |
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| 460 | #define __acquire_shared_ret(call, ret_expr) \
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| 461 | ({ \
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| 462 | __auto_type __ret = call; \
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| 463 | __acquire_shared(ret_expr); \
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| 464 | __ret; \
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| 465 | })
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| 466 |
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| 467 | |
| 468 | * Attributes to mark functions returning acquired context locks.
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| 469 | *
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| 470 | * This is purely cosmetic to help readability, and should be used with the
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| 471 | * above macros as follows:
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| 472 | *
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| 473 | * struct foo { spinlock_t lock; ... };
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| 474 | * ...
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| 475 | * #define myfunc(...) __acquire_ret(_myfunc(__VA_ARGS__), &__ret->lock)
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| 476 | * struct foo *_myfunc(int bar) __acquires_ret;
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| 477 | * ...
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| 478 |
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| 479 | #define __acquires_ret __no_context_analysis
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| 480 | #define __acquires_shared_ret __no_context_analysis
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| 481 |
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| 482 | #endif
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