124 lines
5.4 KiB
C++
124 lines
5.4 KiB
C++
// Copyright 2014 The Crashpad Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef CRASHPAD_UTIL_MACH_MACH_EXTENSIONS_H_
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#define CRASHPAD_UTIL_MACH_MACH_EXTENSIONS_H_
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#include <mach/mach.h>
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namespace crashpad {
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//! \brief `MACH_PORT_NULL` with the correct type for a Mach port,
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//! `mach_port_t`.
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//!
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//! For situations where implicit conversions between signed and unsigned types
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//! are not performed, use kMachPortNull instead of an explicit `implicit_cast`
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//! of `MACH_PORT_NULL` to `mach_port_t`. This is useful for logging and testing
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//! assertions.
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constexpr mach_port_t kMachPortNull = MACH_PORT_NULL;
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//! \brief `MACH_EXCEPTION_CODES` with the correct type for a Mach exception
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//! behavior, `exception_behavior_t`.
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//!
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//! Signedness problems can occur when ORing `MACH_EXCEPTION_CODES` as a signed
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//! integer, because a signed integer overflow results. This constant can be
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//! used instead of `MACH_EXCEPTION_CODES` in such cases.
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constexpr exception_behavior_t kMachExceptionCodes = MACH_EXCEPTION_CODES;
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// Because exception_mask_t is an int and has one bit for each defined
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// exception_type_t, it’s reasonable to assume that there cannot be any
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// officially-defined exception_type_t values higher than 31.
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// kMachExceptionSimulated uses a value well outside this range because it does
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// not require a corresponding mask value. Simulated exceptions are delivered to
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// the exception handler registered for EXC_CRASH exceptions using
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// EXC_MASK_CRASH.
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//! \brief An exception type to use for simulated exceptions.
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constexpr exception_type_t kMachExceptionSimulated = 'CPsx';
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//! \brief An exception type to use for uncaught NSExceptions.
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constexpr exception_type_t kMachExceptionFromNSException = 'CPnx';
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//! \brief A const version of `thread_state_t`.
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//!
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//! This is useful as the \a old_state parameter to exception handler functions.
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//! Normally, these parameters are of type `thread_state_t`, but this allows
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//! modification of the state, which is conceptually `const`.
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using ConstThreadState = const natural_t*;
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//! \brief Like `mach_thread_self()`, but without the obligation to release the
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//! send right.
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//!
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//! `mach_thread_self()` returns a send right to the current thread port,
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//! incrementing its reference count. This burdens the caller with maintaining
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//! this send right, and calling `mach_port_deallocate()` when it is no longer
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//! needed. This is burdensome, and is at odds with the normal operation of
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//! `mach_task_self()`, which does not increment the task port’s reference count
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//! whose result must not be deallocated.
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//!
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//! Callers can use this function in preference to `mach_thread_self()`. This
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//! function returns an extant reference to the current thread’s port without
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//! incrementing its reference count.
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//!
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//! \return The value of `mach_thread_self()` without incrementing its reference
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//! count. The returned port must not be deallocated by
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//! `mach_port_deallocate()`. The returned value is valid as long as the
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//! thread continues to exist as a `pthread_t`.
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thread_t MachThreadSelf();
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//! \brief Creates a new Mach port in the current task.
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//!
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//! This function wraps the `mach_port_allocate()` providing a simpler
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//! interface.
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//!
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//! \param[in] right The type of right to create.
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//!
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//! \return The new Mach port. On failure, `MACH_PORT_NULL` with a message
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//! logged.
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mach_port_t NewMachPort(mach_port_right_t right);
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//! \brief The value for `EXC_MASK_ALL` appropriate for the operating system at
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//! run time.
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//!
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//! The SDK’s definition of `EXC_MASK_ALL` has changed over time, with later
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//! versions containing more bits set than earlier versions. However, older
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//! kernels will reject exception masks that contain bits set that they don’t
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//! recognize. Calling this function will return a value for `EXC_MASK_ALL`
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//! appropriate for the system at run time.
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//!
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//! \note `EXC_MASK_ALL` does not include the value of `EXC_MASK_CRASH` or
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//! `EXC_MASK_CORPSE_NOTIFY`. Consumers that want `EXC_MASK_ALL` along with
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//! `EXC_MASK_CRASH` may use ExcMaskAll() `| EXC_MASK_CRASH`. Consumers may
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//! use ExcMaskValid() for `EXC_MASK_ALL` along with `EXC_MASK_CRASH`,
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//! `EXC_MASK_CORPSE_NOTIFY`, and any values that come into existence in the
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//! future.
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exception_mask_t ExcMaskAll();
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//! \brief An exception mask containing every possible exception understood by
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//! the operating system at run time.
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//!
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//! `EXC_MASK_ALL`, and thus ExcMaskAll(), never includes the value of
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//! `EXC_MASK_CRASH` or `EXC_MASK_CORPSE_NOTIFY`. For situations where an
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//! exception mask corresponding to every possible exception understood by the
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//! running kernel is desired, use this function instead.
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//!
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//! Should new exception types be introduced in the future, this function will
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//! be updated to include their bits in the returned mask value when run time
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//! support is present.
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exception_mask_t ExcMaskValid();
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} // namespace crashpad
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#endif // CRASHPAD_UTIL_MACH_MACH_EXTENSIONS_H_
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