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kern: tweak KAutoObject::Open/Close codegen

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This commit is contained in:
Michael Scire 2021-04-19 18:03:27 -07:00
parent 5bb790e4a7
commit fbc526d163
3 changed files with 35 additions and 30 deletions
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2
libraries/libmesosphere/Makefile
View file

@ -140,6 +140,8 @@ $(OFILES_SRC) : $(HFILES_BIN)
kern_libc_generic.o: CFLAGS += -fno-builtin
kern_k_auto_object.o: CXXFLAGS += -fno-lto
#---------------------------------------------------------------------------------
%_bin.h %.bin.o : %.bin
#---------------------------------------------------------------------------------

32
libraries/libmesosphere/include/mesosphere/kern_k_auto_object.hpp
View file

@ -121,36 +121,8 @@ namespace ams::kern {
}
}
NOINLINE bool Open() {
MESOSPHERE_ASSERT_THIS();
/* Atomically increment the reference count, only if it's positive. */
u32 cur_ref_count = m_ref_count.load(std::memory_order_acquire);
do {
if (AMS_UNLIKELY(cur_ref_count == 0)) {
MESOSPHERE_AUDIT(cur_ref_count != 0);
return false;
}
MESOSPHERE_ABORT_UNLESS(cur_ref_count < cur_ref_count + 1);
} while (!m_ref_count.compare_exchange_weak(cur_ref_count, cur_ref_count + 1, std::memory_order_relaxed));
return true;
}
NOINLINE void Close() {
MESOSPHERE_ASSERT_THIS();
/* Atomically decrement the reference count, not allowing it to become negative. */
u32 cur_ref_count = m_ref_count.load(std::memory_order_acquire);
do {
MESOSPHERE_ABORT_UNLESS(cur_ref_count > 0);
} while (!m_ref_count.compare_exchange_weak(cur_ref_count, cur_ref_count - 1, std::memory_order_relaxed));
/* If ref count hits zero, schedule the object for destruction. */
if (cur_ref_count - 1 == 0) {
this->ScheduleDestruction();
}
}
bool Open();
void Close();
private:
/* NOTE: This has to be defined *after* KThread is defined. */
/* Nintendo seems to handle this by defining Open/Close() in a cpp, but we'd like them to remain in headers. */

31
libraries/libmesosphere/source/kern_k_auto_object.cpp
View file

@ -22,4 +22,35 @@ namespace ams::kern {
return obj;
}
NOINLINE bool KAutoObject::Open() {
MESOSPHERE_ASSERT_THIS();
/* Atomically increment the reference count, only if it's positive. */
u32 cur_ref_count = m_ref_count.load(std::memory_order_relaxed);
do {
if (AMS_UNLIKELY(cur_ref_count == 0)) {
MESOSPHERE_AUDIT(cur_ref_count != 0);
return false;
}
MESOSPHERE_ABORT_UNLESS(cur_ref_count < cur_ref_count + 1);
} while (!m_ref_count.compare_exchange_weak(cur_ref_count, cur_ref_count + 1, std::memory_order_relaxed));
return true;
}
NOINLINE void KAutoObject::Close() {
MESOSPHERE_ASSERT_THIS();
/* Atomically decrement the reference count, not allowing it to become negative. */
u32 cur_ref_count = m_ref_count.load(std::memory_order_relaxed);
do {
MESOSPHERE_ABORT_UNLESS(cur_ref_count > 0);
} while (!m_ref_count.compare_exchange_weak(cur_ref_count, cur_ref_count - 1, std::memory_order_relaxed));
/* If ref count hits zero, schedule the object for destruction. */
if (cur_ref_count - 1 == 0) {
this->ScheduleDestruction();
}
}
}