rusefi/firmware/controllers/global_shared.h

/*
 * @file global_shared.h
 *
 * part of global.h which is shared between firmware and simulator
 * See also common_headers.h
 *
 * Dec 25, 2018
 * @author Andrey Belomutskiy, (c) 2012-2019
 */

#pragma once

/**
 * The following obscurantism is a hack to reduce stack usage, maybe even a questionable performance
 * optimization.
 * 
 * Of note is that interrupts are NOT serviced on the stack of the thread that was running when the
 * interrupt occurred. The only thing that happens on that thread's stack is that its registers are
 * pushed (by hardware) when an interrupt occurs, just before swapping the stack pointer out for the
 * main stack (currently 0x400=1024 bytes), where the ISR actually runs.
 * see also __main_stack_size__
 * see also __process_stack_size__
 * 
 * see also http://www.chibios.org/dokuwiki/doku.php?id=chibios:kb:stacks
 *
 * In the firmware we are using 'extern *Engine' - in the firmware Engine is a signleton
 *
 * On the other hand, in order to have a meaningful unit test we are passing Engine * engine as a parameter
 */

#include "global.h"

#define EXTERN_CONFIG \
		extern engine_configuration_s *engineConfiguration; \
		extern engine_configuration_s *engineConfiguration; \
		extern engine_configuration_s & activeConfiguration; \
		extern persistent_config_container_s persistentState; \
		extern persistent_config_s *config; \

#define EXTERN_ENGINE \
		extern Engine ___engine; \
		extern Engine *engine; \
		EXTERN_CONFIG \
		extern EnginePins enginePins \


// Use this macro to declare a function which only takes magic references
#define DECLARE_ENGINE_PARAMETER_SIGNATURE void
// Use this version of the macro as the suffix if method has other parameters
#define DECLARE_ENGINE_PARAMETER_SUFFIX
// Pass this if only magic references are needed
#define PASS_ENGINE_PARAMETER_SIGNATURE
// Pass this after some other parameters are passed
#define PASS_ENGINE_PARAMETER_SUFFIX

// these macro are used when we should not have visibility to 'engine'
#define DECLARE_CONFIG_PARAMETER_SIGNATURE void
#define DECLARE_CONFIG_PARAMETER_SUFFIX
#define PASS_CONFIG_PARAMETER_SIGNATURE
#define PASS_CONFIG_PARAMETER_SUFFIX

/**
 * this macro allows the compiled to figure out the complete static address, that's a performance
 * optimization which is hopefully useful at least for anything trigger-related
 *
 * this is related to the fact that for unit tests we prefer to explicitly pass references in method signature thus code covered by
 * unit tests would need to use by-reference access. These macro allow us to have faster by-address access in real firmware and by-reference
 * access in unit tests
 */
#define CONFIG(x) persistentState.persistentConfiguration.engineConfiguration.x
#define ENGINE(x) ___engine.x

#define DEFINE_CONFIG_PARAM(x, y)
#define CONFIG_PARAM(x) CONFIG(x)
#define PASS_CONFIG_PARAM(x)

#define EXPECTED_REMAINING_STACK 128