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/*
* The MIT License (MIT)
*
* Copyright (c) 2019 Ha Thach (tinyusb.org)
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* This file is part of the TinyUSB stack.
*/
#ifndef TUSB_VERIFY_H_
#define TUSB_VERIFY_H_
#include <stdbool.h>
#include <stdint.h>
#include "tusb_option.h"
#include "tusb_compiler.h"
/*------------------------------------------------------------------*/
/* This file use an advanced macro technique to mimic the default parameter
* as C++ for the sake of code simplicity. Beware of a headache macro
* manipulation that you are told to stay away.
*
* This contains macros for both VERIFY and ASSERT:
*
* VERIFY: Used when there is an error condition which is not the
* fault of the MCU. For example, bounds checking on data
* sent to the micro over USB should use this function.
* Another example is checking for buffer overflows, where
* returning from the active function causes a NAK.
*
* ASSERT: Used for error conditions that are caused by MCU firmware
* bugs. This is used to discover bugs in the code more
* quickly. One example would be adding assertions in library
* function calls to confirm a function's (untainted)
* parameters are valid.
*
* The difference in behavior is that ASSERT triggers a breakpoint while
* verify does not.
*
* #define TU_VERIFY(cond) if(cond) return false;
* #define TU_VERIFY(cond,ret) if(cond) return ret;
*
* #define TU_ASSERT(cond) if(cond) {TU_MESS_FAILED(); TU_BREAKPOINT(), return false;}
* #define TU_ASSERT(cond,ret) if(cond) {TU_MESS_FAILED(); TU_BREAKPOINT(), return ret;}
*------------------------------------------------------------------*/
#ifdef __cplusplus
extern "C" {
#endif
//--------------------------------------------------------------------+
// TU_VERIFY Helper
//--------------------------------------------------------------------+
#if CFG_TUSB_DEBUG
#include <stdio.h>
#define TU_MESS_FAILED() tu_printf("%s %d: ASSERT FAILED\r\n", __func__, __LINE__)
#else
#define TU_MESS_FAILED() do {} while (0)
#endif
// Halt CPU (breakpoint) when hitting error, only apply for Cortex M3, M4, M7, M33. M55
#if defined(__ARM_ARCH_7M__) || defined (__ARM_ARCH_7EM__) || defined(__ARM_ARCH_8M_MAIN__) || defined(__ARM_ARCH_8_1M_MAIN__) || \
defined(__ARM7M__) || defined (__ARM7EM__) || defined(__ARM8M_MAINLINE__) || defined(__ARM8EM_MAINLINE__)
#define TU_BREAKPOINT() do { \
volatile uint32_t* ARM_CM_DHCSR = ((volatile uint32_t*) 0xE000EDF0UL); /* Cortex M CoreDebug->DHCSR */ \
if ( (*ARM_CM_DHCSR) & 1UL ) __asm("BKPT #0\n"); /* Only halt mcu if debugger is attached */ \
} while(0)
#elif defined(__riscv) && !TUP_MCU_ESPRESSIF
#define TU_BREAKPOINT() do { __asm("ebreak\n"); } while(0)
#elif defined(_mips)
#define TU_BREAKPOINT() do { __asm("sdbbp 0"); } while (0)
#else
#define TU_BREAKPOINT() do {} while (0)
#endif
// Helper to implement optional parameter for TU_VERIFY Macro family
#define _GET_3RD_ARG(arg1, arg2, arg3, ...) arg3
/*------------------------------------------------------------------*/
/* TU_VERIFY
* - TU_VERIFY_1ARGS : return false if failed
* - TU_VERIFY_2ARGS : return provided value if failed
*------------------------------------------------------------------*/
#define TU_VERIFY_DEFINE(_cond, _ret) \
do { \
if ( !(_cond) ) { return _ret; } \
} while(0)
#define TU_VERIFY_1ARGS(_cond) TU_VERIFY_DEFINE(_cond, false)
#define TU_VERIFY_2ARGS(_cond, _ret) TU_VERIFY_DEFINE(_cond, _ret)
#define TU_VERIFY(...) _GET_3RD_ARG(__VA_ARGS__, TU_VERIFY_2ARGS, TU_VERIFY_1ARGS, _dummy)(__VA_ARGS__)
/*------------------------------------------------------------------*/
/* ASSERT
* basically TU_VERIFY with TU_BREAKPOINT() as handler
* - 1 arg : return false if failed
* - 2 arg : return error if failed
*------------------------------------------------------------------*/
#define TU_ASSERT_DEFINE(_cond, _ret) \
do { \
if ( !(_cond) ) { TU_MESS_FAILED(); TU_BREAKPOINT(); return _ret; } \
} while(0)
#define TU_ASSERT_1ARGS(_cond) TU_ASSERT_DEFINE(_cond, false)
#define TU_ASSERT_2ARGS(_cond, _ret) TU_ASSERT_DEFINE(_cond, _ret)
#ifndef TU_ASSERT
#define TU_ASSERT(...) _GET_3RD_ARG(__VA_ARGS__, TU_ASSERT_2ARGS, TU_ASSERT_1ARGS, _dummy)(__VA_ARGS__)
#endif
#ifdef __cplusplus
}
#endif
#endif
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