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Add ConstThreadState to mach_extensions.h and use it everywhere.

Browse Source 
TEST=everything
R=rsesek@chromium.org

Review URL: https://codereview.chromium.org/1058523002
This commit is contained in:
Mark Mentovai 2015-04-02 15:28:28 -04:00
parent 71b8efef96
commit 40b1d7cb1d
21 changed files with 77 additions and 67 deletions
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3
client/simulate_crash_mac.cc
View File

@ -70,9 +70,6 @@ bool DeliverException(thread_t thread,
set_state = false;
}
// A const version of thread_state_t.
using ConstThreadState = const natural_t*;
// old_state is only used if the context already captured doesn’t match (or
// can’t be converted to) what’s registered for the handler.
thread_state_data_t old_state;

2
client/simulate_crash_mac_test.cc
View File

@ -88,7 +88,7 @@ class TestSimulateCrashMac final : public MachMultiprocess,
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

2
handler/mac/crash_report_exception_handler.cc
View File

@ -88,7 +88,7 @@ kern_return_t CrashReportExceptionHandler::CatchMachException(
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

2
handler/mac/crash_report_exception_handler.h
View File

@ -66,7 +66,7 @@ class CrashReportExceptionHandler : public UniversalMachExcServer::Interface {
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

2
handler/mac/exception_handler_server.cc
View File

@ -117,7 +117,7 @@ class ExceptionHandlerServerRun : public UniversalMachExcServer::Interface,
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

20
snapshot/mac/cpu_context_mac.cc
View File

@ -83,7 +83,7 @@ void InitializeCPUContextX86Debug(
thread_state_flavor_t InitializeCPUContextX86Flavor(
CPUContextX86* context,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count) {
mach_msg_type_number_t expected_state_count;
switch (flavor) {
@ -131,7 +131,7 @@ thread_state_flavor_t InitializeCPUContextX86Flavor(
return InitializeCPUContextX86Flavor(
context,
x86_thread_state->tsh.flavor,
reinterpret_cast<const natural_t*>(&x86_thread_state->uts.ts32),
reinterpret_cast<ConstThreadState>(&x86_thread_state->uts.ts32),
x86_thread_state->tsh.count);
}
@ -146,7 +146,7 @@ thread_state_flavor_t InitializeCPUContextX86Flavor(
return InitializeCPUContextX86Flavor(
context,
x86_float_state->fsh.flavor,
reinterpret_cast<const natural_t*>(&x86_float_state->ufs.fs32),
reinterpret_cast<ConstThreadState>(&x86_float_state->ufs.fs32),
x86_float_state->fsh.count);
}
@ -161,7 +161,7 @@ thread_state_flavor_t InitializeCPUContextX86Flavor(
return InitializeCPUContextX86Flavor(
context,
x86_debug_state->dsh.flavor,
reinterpret_cast<const natural_t*>(&x86_debug_state->uds.ds32),
reinterpret_cast<ConstThreadState>(&x86_debug_state->uds.ds32),
x86_debug_state->dsh.count);
}
@ -264,7 +264,7 @@ void InitializeCPUContextX86_64Debug(
thread_state_flavor_t InitializeCPUContextX86_64Flavor(
CPUContextX86_64* context,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count) {
mach_msg_type_number_t expected_state_count;
switch (flavor) {
@ -312,7 +312,7 @@ thread_state_flavor_t InitializeCPUContextX86_64Flavor(
return InitializeCPUContextX86_64Flavor(
context,
x86_thread_state->tsh.flavor,
reinterpret_cast<const natural_t*>(&x86_thread_state->uts.ts64),
reinterpret_cast<ConstThreadState>(&x86_thread_state->uts.ts64),
x86_thread_state->tsh.count);
}
@ -327,7 +327,7 @@ thread_state_flavor_t InitializeCPUContextX86_64Flavor(
return InitializeCPUContextX86_64Flavor(
context,
x86_float_state->fsh.flavor,
reinterpret_cast<const natural_t*>(&x86_float_state->ufs.fs64),
reinterpret_cast<ConstThreadState>(&x86_float_state->ufs.fs64),
x86_float_state->fsh.count);
}
@ -342,7 +342,7 @@ thread_state_flavor_t InitializeCPUContextX86_64Flavor(
return InitializeCPUContextX86_64Flavor(
context,
x86_debug_state->dsh.flavor,
reinterpret_cast<const natural_t*>(&x86_debug_state->uds.ds64),
reinterpret_cast<ConstThreadState>(&x86_debug_state->uds.ds64),
x86_debug_state->dsh.count);
}
@ -387,7 +387,7 @@ namespace internal {
void InitializeCPUContextX86(CPUContextX86* context,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count,
const x86_thread_state32_t* x86_thread_state32,
const x86_float_state32_t* x86_float_state32,
@ -411,7 +411,7 @@ void InitializeCPUContextX86(CPUContextX86* context,
void InitializeCPUContextX86_64(CPUContextX86_64* context,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count,
const x86_thread_state64_t* x86_thread_state64,
const x86_float_state64_t* x86_float_state64,

5
snapshot/mac/cpu_context_mac.h
View File

@ -19,6 +19,7 @@
#include "build/build_config.h"
#include "snapshot/cpu_context.h"
#include "util/mach/mach_extensions.h"
namespace crashpad {
namespace internal {
@ -60,7 +61,7 @@ namespace internal {
//! \param[in] x86_debug_state32 The state of the thread’s debug registers.
void InitializeCPUContextX86(CPUContextX86* context,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count,
const x86_thread_state32_t* x86_thread_state32,
const x86_float_state32_t* x86_float_state32,
@ -101,7 +102,7 @@ void InitializeCPUContextX86(CPUContextX86* context,
//! \param[in] x86_debug_state64 The state of the thread’s debug registers.
void InitializeCPUContextX86_64(CPUContextX86_64* context,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count,
const x86_thread_state64_t* x86_thread_state64,
const x86_float_state64_t* x86_float_state64,

2
snapshot/mac/exception_snapshot_mac.cc
View File

@ -45,7 +45,7 @@ bool ExceptionSnapshotMac::Initialize(ProcessReader* process_reader,
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count) {
INITIALIZATION_STATE_SET_INITIALIZING(initialized_);

3
snapshot/mac/exception_snapshot_mac.h
View File

@ -24,6 +24,7 @@
#include "build/build_config.h"
#include "snapshot/cpu_context.h"
#include "snapshot/exception_snapshot.h"
#include "util/mach/mach_extensions.h"
#include "util/misc/initialization_state_dcheck.h"
namespace crashpad {
@ -55,7 +56,7 @@ class ExceptionSnapshotMac final : public ExceptionSnapshot {
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count);
// ExceptionSnapshot:

3
snapshot/mac/mach_o_image_annotations_reader_test.cc
View File

@ -37,6 +37,7 @@
#include "util/mac/mac_util.h"
#include "util/mach/exc_server_variants.h"
#include "util/mach/exception_ports.h"
#include "util/mach/mach_extensions.h"
#include "util/mach/mach_message.h"
#include "util/mach/mach_message_server.h"
@ -79,7 +80,7 @@ class TestMachOImageAnnotationsReader final
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

2
snapshot/mac/process_snapshot_mac.cc
View File

@ -62,7 +62,7 @@ bool ProcessSnapshotMac::InitializeException(
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count) {
INITIALIZATION_STATE_DCHECK_VALID(initialized_);
DCHECK(!exception_);

3
snapshot/mac/process_snapshot_mac.h
View File

@ -37,6 +37,7 @@
#include "snapshot/process_snapshot.h"
#include "snapshot/system_snapshot.h"
#include "snapshot/thread_snapshot.h"
#include "util/mach/mach_extensions.h"
#include "util/misc/initialization_state_dcheck.h"
#include "util/misc/uuid.h"
#include "util/stdlib/pointer_container.h"
@ -74,7 +75,7 @@ class ProcessSnapshotMac final : public ProcessSnapshot {
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t flavor,
const natural_t* state,
ConstThreadState state,
mach_msg_type_number_t state_count);
//! \brief Sets the value to be returned by ReportID().

2
tools/mac/catch_exception_tool.cc
View File

@ -68,7 +68,7 @@ class ExceptionServer : public UniversalMachExcServer::Interface {
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

3
util/mach/exc_client_variants.cc
View File

@ -19,7 +19,6 @@
#include "base/logging.h"
#include "util/mach/exc.h"
#include "util/mach/mach_exc.h"
#include "util/mach/mach_extensions.h"
namespace crashpad {
@ -31,7 +30,7 @@ kern_return_t UniversalExceptionRaise(exception_behavior_t behavior,
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count) {

4
util/mach/exc_client_variants.h
View File

@ -17,6 +17,8 @@
#include <mach/mach.h>
#include "util/mach/mach_extensions.h"
namespace crashpad {
//! \brief Calls the appropriate `*exception_raise*()` function for the
@ -73,7 +75,7 @@ kern_return_t UniversalExceptionRaise(exception_behavior_t behavior,
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count);

2
util/mach/exc_client_variants_test.cc
View File

@ -58,7 +58,7 @@ class TestExcClientVariants : public MachMultiprocess,
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

16
util/mach/exc_server_variants.cc
View File

@ -276,7 +276,7 @@ class ExcServer : public MachMessageServer::Interface {
const typename Traits::ExceptionCode* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -302,7 +302,7 @@ class ExcServer : public MachMessageServer::Interface {
const typename Traits::ExceptionCode* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -523,7 +523,7 @@ class SimplifiedExcServer final : public ExcServer<Traits>,
const typename Traits::ExceptionCode* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -577,7 +577,7 @@ class SimplifiedExcServer final : public ExcServer<Traits>,
const typename Traits::ExceptionCode* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -608,7 +608,7 @@ class SimplifiedExcServer final : public ExcServer<Traits>,
const typename Traits::ExceptionCode* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -669,7 +669,7 @@ class UniversalMachExcServerImpl final
const exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -706,7 +706,7 @@ class UniversalMachExcServerImpl final
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -804,7 +804,7 @@ kern_return_t ExcServerSuccessfulReturnValue(exception_behavior_t behavior,
}
void ExcServerCopyState(exception_behavior_t behavior,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count) {

5
util/mach/exc_server_variants.h
View File

@ -21,6 +21,7 @@
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "util/mach/mach_extensions.h"
#include "util/mach/mach_message_server.h"
namespace crashpad {
@ -83,7 +84,7 @@ class UniversalMachExcServer final : public MachMessageServer::Interface {
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -231,7 +232,7 @@ kern_return_t ExcServerSuccessfulReturnValue(exception_behavior_t behavior,
//! \a behavior is state-carrying, this parameter should be at least as
//! large as \a old_state_count.
void ExcServerCopyState(exception_behavior_t behavior,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count);

54
util/mach/exc_server_variants_test.cc
View File

@ -24,7 +24,6 @@
#include "test/mac/mach_errors.h"
#include "test/mac/mach_multiprocess.h"
#include "util/mach/exception_behaviors.h"
#include "util/mach/mach_extensions.h"
#include "util/mach/mach_message.h"
namespace crashpad {
@ -455,12 +454,12 @@ class MockUniversalMachExcServer : public UniversalMachExcServer::Interface {
const mach_exception_data_type_t* code;
mach_msg_type_number_t code_count;
};
struct ThreadState {
struct ThreadStateAndCount {
thread_state_t state;
mach_msg_type_number_t* state_count;
};
struct ConstThreadState {
const natural_t* state;
struct ConstThreadStateAndCount {
ConstThreadState state;
mach_msg_type_number_t* state_count;
};
@ -478,7 +477,7 @@ class MockUniversalMachExcServer : public UniversalMachExcServer::Interface {
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,
@ -486,8 +485,9 @@ class MockUniversalMachExcServer : public UniversalMachExcServer::Interface {
bool* destroy_complex_request) override {
*destroy_complex_request = true;
const ConstExceptionCodes exception_codes = {code, code_count};
const ConstThreadState old_thread_state = {old_state, &old_state_count};
ThreadState new_thread_state = {new_state, new_state_count};
const ConstThreadStateAndCount old_thread_state = {old_state,
&old_state_count};
ThreadStateAndCount new_thread_state = {new_state, new_state_count};
return MockCatchMachException(behavior,
exception_port,
thread,
@ -508,8 +508,8 @@ class MockUniversalMachExcServer : public UniversalMachExcServer::Interface {
exception_type_t exception,
const ConstExceptionCodes* exception_codes,
thread_state_flavor_t* flavor,
const ConstThreadState* old_thread_state,
ThreadState* new_thread_state,
const ConstThreadStateAndCount* old_thread_state,
ThreadStateAndCount* new_thread_state,
const mach_msg_trailer_t* trailer));
};
@ -537,11 +537,11 @@ MATCHER_P2(AreExceptionCodes, code_0, code_1, "") {
return false;
}
// Matcher for ThreadState and ConstThreadState, testing that *state_count is
// present and matches the specified value. If 0 is specified for the count,
// |state| must be nullptr (not present), otherwise |state| must not be nullptr
// (present).
MATCHER_P(IsThreadStateCount, state_count, "") {
// Matcher for ThreadStateAndCount and ConstThreadStateAndCount, testing that
// *state_count is present and matches the specified value. If 0 is specified
// for the count, |state| must be nullptr (not present), otherwise |state| must
// not be nullptr (present).
MATCHER_P(IsThreadStateAndCount, state_count, "") {
if (!arg) {
return false;
}
@ -607,8 +607,8 @@ TEST(ExcServerVariants, MockExceptionRaise) {
AreExceptionCodes(kTestExceptonCodes[0],
kTestExceptonCodes[1]),
Pointee(Eq(THREAD_STATE_NONE)),
IsThreadStateCount(0u),
IsThreadStateCount(0u),
IsThreadStateAndCount(0u),
IsThreadStateAndCount(0u),
Eq(&request.trailer)))
.WillOnce(Return(KERN_SUCCESS))
.RetiresOnSaturation();
@ -653,8 +653,8 @@ TEST(ExcServerVariants, MockExceptionRaiseState) {
kExceptionType,
AreExceptionCodes(kTestExceptonCodes[0], kTestExceptonCodes[1]),
Pointee(Eq(kThreadStateFlavor)),
IsThreadStateCount(kThreadStateFlavorCount),
IsThreadStateCount(arraysize(reply.new_state)),
IsThreadStateAndCount(kThreadStateFlavorCount),
IsThreadStateAndCount(arraysize(reply.new_state)),
Eq(request.Trailer())))
.WillOnce(Return(KERN_SUCCESS))
.RetiresOnSaturation();
@ -702,8 +702,8 @@ TEST(ExcServerVariants, MockExceptionRaiseStateIdentity) {
kExceptionType,
AreExceptionCodes(kTestExceptonCodes[0], kTestExceptonCodes[1]),
Pointee(Eq(kThreadStateFlavor)),
IsThreadStateCount(kThreadStateFlavorCount),
IsThreadStateCount(arraysize(reply.new_state)),
IsThreadStateAndCount(kThreadStateFlavorCount),
IsThreadStateAndCount(arraysize(reply.new_state)),
Eq(request.Trailer())))
.WillOnce(Return(KERN_SUCCESS))
.RetiresOnSaturation();
@ -749,8 +749,8 @@ TEST(ExcServerVariants, MockMachExceptionRaise) {
AreExceptionCodes(kTestMachExceptionCodes[0],
kTestMachExceptionCodes[1]),
Pointee(Eq(THREAD_STATE_NONE)),
IsThreadStateCount(0u),
IsThreadStateCount(0u),
IsThreadStateAndCount(0u),
IsThreadStateAndCount(0u),
Eq(&request.trailer)))
.WillOnce(Return(KERN_SUCCESS))
.RetiresOnSaturation();
@ -796,8 +796,8 @@ TEST(ExcServerVariants, MockMachExceptionRaiseState) {
AreExceptionCodes(kTestMachExceptionCodes[0],
kTestMachExceptionCodes[1]),
Pointee(Eq(kThreadStateFlavor)),
IsThreadStateCount(kThreadStateFlavorCount),
IsThreadStateCount(arraysize(reply.new_state)),
IsThreadStateAndCount(kThreadStateFlavorCount),
IsThreadStateAndCount(arraysize(reply.new_state)),
Eq(request.Trailer())))
.WillOnce(Return(KERN_SUCCESS))
.RetiresOnSaturation();
@ -846,8 +846,8 @@ TEST(ExcServerVariants, MockMachExceptionRaiseStateIdentity) {
AreExceptionCodes(kTestMachExceptionCodes[0],
kTestMachExceptionCodes[1]),
Pointee(Eq(kThreadStateFlavor)),
IsThreadStateCount(kThreadStateFlavorCount),
IsThreadStateCount(arraysize(reply.new_state)),
IsThreadStateAndCount(kThreadStateFlavorCount),
IsThreadStateAndCount(arraysize(reply.new_state)),
Eq(request.Trailer())))
.WillOnce(Return(KERN_SUCCESS))
.RetiresOnSaturation();
@ -976,7 +976,7 @@ class TestExcServerVariants : public MachMultiprocess,
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

2
util/mach/exception_ports_test.cc
View File

@ -152,7 +152,7 @@ class TestExceptionPorts : public MachMultiprocess,
const mach_exception_data_type_t* code,
mach_msg_type_number_t code_count,
thread_state_flavor_t* flavor,
const natural_t* old_state,
ConstThreadState old_state,
mach_msg_type_number_t old_state_count,
thread_state_t new_state,
mach_msg_type_number_t* new_state_count,

7
util/mach/mach_extensions.h
View File

@ -47,6 +47,13 @@ const exception_behavior_t kMachExceptionCodes = MACH_EXCEPTION_CODES;
//! \brief An exception type to use for simulated exceptions.
const exception_type_t kMachExceptionSimulated = 'CPsx';
//! \brief A const version of `thread_state_t`.
//!
//! This is useful as the \a old_state parameter to exception handler functions.
//! Normally, these parameters are of type `thread_state_t`, but this allows
//! modification of the state, which is conceptually `const`.
using ConstThreadState = const natural_t*;
//! \brief Like `mach_thread_self()`, but without the obligation to release the
//! send right.
//!