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//===-- xray_log_interface.cc ---------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of XRay, a function call tracing system.
//
//===----------------------------------------------------------------------===//
#include "xray/xray_log_interface.h"
#include "sanitizer_common/sanitizer_allocator_internal.h"
#include "sanitizer_common/sanitizer_atomic.h"
#include "sanitizer_common/sanitizer_mutex.h"
#include "xray/xray_interface.h"
#include "xray_defs.h"
__sanitizer::SpinMutex XRayImplMutex;
XRayLogImpl CurrentXRayImpl{nullptr, nullptr, nullptr, nullptr};
XRayLogImpl *GlobalXRayImpl = nullptr;
// We use a linked list of Mode to XRayLogImpl mappings. This is a linked list
// when it should be a map because we're avoiding having to depend on C++
// standard library data structures at this level of the implementation.
struct ModeImpl {
ModeImpl *Next;
const char *Mode;
XRayLogImpl Impl;
};
ModeImpl SentinelModeImpl{
nullptr, nullptr, {nullptr, nullptr, nullptr, nullptr}};
ModeImpl *ModeImpls = &SentinelModeImpl;
XRayLogRegisterStatus
__xray_log_register_mode(const char *Mode,
XRayLogImpl Impl) XRAY_NEVER_INSTRUMENT {
if (Impl.flush_log == nullptr || Impl.handle_arg0 == nullptr ||
Impl.log_finalize == nullptr || Impl.log_init == nullptr)
return XRayLogRegisterStatus::XRAY_INCOMPLETE_IMPL;
__sanitizer::SpinMutexLock Guard(&XRayImplMutex);
// First, look for whether the mode already has a registered implementation.
for (ModeImpl *it = ModeImpls; it != &SentinelModeImpl; it = it->Next) {
if (!__sanitizer::internal_strcmp(Mode, it->Mode))
return XRayLogRegisterStatus::XRAY_DUPLICATE_MODE;
}
auto *NewModeImpl =
static_cast<ModeImpl *>(__sanitizer::InternalAlloc(sizeof(ModeImpl)));
NewModeImpl->Next = ModeImpls;
NewModeImpl->Mode = __sanitizer::internal_strdup(Mode);
NewModeImpl->Impl = Impl;
ModeImpls = NewModeImpl;
return XRayLogRegisterStatus::XRAY_REGISTRATION_OK;
}
XRayLogRegisterStatus
__xray_log_select_mode(const char *Mode) XRAY_NEVER_INSTRUMENT {
__sanitizer::SpinMutexLock Guard(&XRayImplMutex);
for (ModeImpl *it = ModeImpls; it != &SentinelModeImpl; it = it->Next) {
if (!__sanitizer::internal_strcmp(Mode, it->Mode)) {
CurrentXRayImpl = it->Impl;
GlobalXRayImpl = &CurrentXRayImpl;
__xray_set_handler(it->Impl.handle_arg0);
return XRayLogRegisterStatus::XRAY_REGISTRATION_OK;
}
}
return XRayLogRegisterStatus::XRAY_MODE_NOT_FOUND;
}
void __xray_set_log_impl(XRayLogImpl Impl) XRAY_NEVER_INSTRUMENT {
if (Impl.log_init == nullptr || Impl.log_finalize == nullptr ||
Impl.handle_arg0 == nullptr || Impl.flush_log == nullptr) {
__sanitizer::SpinMutexLock Guard(&XRayImplMutex);
GlobalXRayImpl = nullptr;
__xray_remove_handler();
__xray_remove_handler_arg1();
return;
}
__sanitizer::SpinMutexLock Guard(&XRayImplMutex);
CurrentXRayImpl = Impl;
GlobalXRayImpl = &CurrentXRayImpl;
__xray_set_handler(Impl.handle_arg0);
}
void __xray_remove_log_impl() XRAY_NEVER_INSTRUMENT {
__sanitizer::SpinMutexLock Guard(&XRayImplMutex);
GlobalXRayImpl = nullptr;
__xray_remove_handler();
__xray_remove_handler_arg1();
}
XRayLogInitStatus __xray_log_init(size_t BufferSize, size_t MaxBuffers,
void *Args,
size_t ArgsSize) XRAY_NEVER_INSTRUMENT {
__sanitizer::SpinMutexLock Guard(&XRayImplMutex);
if (!GlobalXRayImpl)
return XRayLogInitStatus::XRAY_LOG_UNINITIALIZED;
return GlobalXRayImpl->log_init(BufferSize, MaxBuffers, Args, ArgsSize);
}
XRayLogInitStatus __xray_log_finalize() XRAY_NEVER_INSTRUMENT {
__sanitizer::SpinMutexLock Guard(&XRayImplMutex);
if (!GlobalXRayImpl)
return XRayLogInitStatus::XRAY_LOG_UNINITIALIZED;
return GlobalXRayImpl->log_finalize();
}
XRayLogFlushStatus __xray_log_flushLog() XRAY_NEVER_INSTRUMENT {
__sanitizer::SpinMutexLock Guard(&XRayImplMutex);
if (!GlobalXRayImpl)
return XRayLogFlushStatus::XRAY_LOG_NOT_FLUSHING;
return GlobalXRayImpl->flush_log();
}
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