Jeff Epler
55b0f157c7
Surprisingly this leads to some code size savings on itsybitsym4, even though LTO optimization should have let the compiler deduce (almost) all of this. When a compiler knows a call can never return, it is possibly able to avoid emitting code, such as saving caller-saved registers to the stack, or doing _ANYTHING_ affter the function returns, explaining why code size savings is possible with this attribute. With the exception of raise_deinited_error, these were found by checking the functions found by `-Wmissing-noreturn` and making a case by case decision. However, this dignostic can't be enabled unconditionally as it has false positives, functions we do NOT want to mark as noreturn. Testing performed: built itsybitsy m4, flash size savings 128 bytes. didn't test on hardware as none came on this trip with me.
45 lines
1.3 KiB
C
45 lines
1.3 KiB
C
// This file is part of the CircuitPython project: https://circuitpython.org
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//
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// SPDX-FileCopyrightText: Copyright (c) 2016 Scott Shawcroft
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//
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// SPDX-License-Identifier: MIT
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#pragma once
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#include "py/obj.h"
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#include "py/mpconfig.h"
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#include "py/objtuple.h"
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#include "common-hal/microcontroller/Processor.h"
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#include "shared-bindings/microcontroller/ResetReason.h"
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#include "shared-bindings/microcontroller/RunMode.h"
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extern void common_hal_mcu_delay_us(uint32_t);
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extern void common_hal_mcu_disable_interrupts(void);
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extern void common_hal_mcu_enable_interrupts(void);
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extern void common_hal_mcu_on_next_reset(mcu_runmode_t runmode);
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NORETURN extern void common_hal_mcu_reset(void);
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extern const mp_obj_dict_t mcu_pin_globals;
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#if CIRCUITPY_PROCESSOR_COUNT == 1
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extern const mcu_processor_obj_t common_hal_mcu_processor_obj;
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#elif CIRCUITPY_PROCESSOR_COUNT > 1
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extern const mcu_processor_obj_t common_hal_mcu_processor_obj;
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extern const mp_rom_obj_tuple_t common_hal_multi_processor_obj;
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#else
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#error "Invalid processor count"
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#endif
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#if CIRCUITPY_NVM && CIRCUITPY_INTERNAL_NVM_SIZE > 0
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#include "common-hal/nvm/ByteArray.h"
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extern const nvm_bytearray_obj_t common_hal_mcu_nvm_obj;
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#endif
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#if CIRCUITPY_WATCHDOG
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#include "common-hal/watchdog/WatchDogTimer.h"
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extern watchdog_watchdogtimer_obj_t common_hal_mcu_watchdogtimer_obj;
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#endif
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