esp-idf/components/cxx/cxx_init.cpp

51 lines
1.4 KiB
C++

/*
* SPDX-FileCopyrightText: 2024 Espressif Systems (Shanghai) CO LTD
*
* SPDX-License-Identifier: Apache-2.0
*/
#include "sdkconfig.h"
#include "esp_log.h"
#include "esp_private/startup_internal.h"
namespace {
const char *TAG = "C++ init";
}
#ifdef CONFIG_COMPILER_CXX_EXCEPTIONS
// workaround for C++ exception large memory allocation
extern "C" void _Unwind_SetEnableExceptionFdeSorting(unsigned char enable);
ESP_SYSTEM_INIT_FN(init_cxx_exceptions, SECONDARY, BIT(0), 205)
{
ESP_EARLY_LOGD(TAG, "Setting C++ exception workarounds.");
_Unwind_SetEnableExceptionFdeSorting(0);
return ESP_OK;
}
#endif // CONFIG_COMPILER_CXX_EXCEPTIONS
/**
* This function overwrites the same function of libsupc++ (part of libstdc++).
* Consequently, libsupc++ will then follow our configured exception emergency pool size.
*
* It will be called even with -fno-exception for user code since the stdlib still uses exceptions.
*/
extern "C" size_t __cxx_eh_arena_size_get(void)
{
#ifdef CONFIG_COMPILER_CXX_EXCEPTIONS
ESP_EARLY_LOGD(TAG, "Setting C++ exception emergency pool to %u.", CONFIG_COMPILER_CXX_EXCEPTIONS_EMG_POOL_SIZE);
return CONFIG_COMPILER_CXX_EXCEPTIONS_EMG_POOL_SIZE;
#else
ESP_EARLY_LOGD(TAG, "Setting C++ exception emergency pool to 0.");
return 0;
#endif
}
/**
* Dummy function used to force linking this file.
* This works via -u __cxx_init_dummy flag in CMakeLists.txt
*/
extern "C" void __cxx_init_dummy(void)
{
}