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UID2108106
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蝴蝶豆24
注册时间2015-2-4
论坛元老
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- 2020-9-4
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a0a.1 32b0c
看上去工作的挺好!
OStream & operator<<(OStream& stream,char c)
{
stream.Putc(c);
return stream;
}
//;OStream 基类名.
O0 下编译
; operator<<(OStream &, char)
EXPORT _ZlsR7OStreamc
_ZlsR7OStreamc
PUSH {R4-R6,LR}
MOV R4, R0
MOV R5, R1
LDR R0, [R4]
MOV R1, R5
LDR R2, [R0]
MOV R0, R4
BLX R2
MOV R0, R4
POP {R4-R6,PC}
O3 下编译
; operator<<(OStream &, char)
EXPORT _ZlsR7OStreamc
_ZlsR7OStreamc
PUSH {R4,LR}
MOV R4, R0
LDR R0, [R0]
LDR R2, [R0]
MOV R0, R4
BLX R2
MOV R0, R4
POP {R4,PC}
=====================================
LDR R2, [R0]
BLX R2
是获取成员函数地址(这具体与调用那个函数有关),并跳转。
R0,R1什么传个参数就不讲了
可以看出优化明显把
MOV R5, R1; MOV R1, R5;
给优化了。
另外,如预计的那样:main在返回之前调用了析构函数
。。。。
BL _ZlsR7OStreamPc ; operator<<(OStream &,char *)
ADD R0, SP, #0x170+var_90
BL _ZN11UartOStreamD2Ev ; UartOStream::~UartOStream()
MOVS R0, #1
ADD SP, SP, #0x154
POP.W {R4-R9,PC}
; End of function main
感觉好水。。。
代码:
myio.cpp:
- #include "myio.hpp"
- OStream & operator<<(OStream& stream,char c)
- {
- stream.Putc(c);
- return stream;
- }
- OStream & operator<<(OStream& stream,char* s)
- {
- stream.Puts(s);
- return stream;
- }
- UartOStream uartout;
- LedOStream led;
复制代码 myio.hpp
- #ifndef _MY_IO_HPP
- #define _MY_IO_HPP
- #include "stm32l4xx_hal.h"
- class OStream
- {
- public:
- OStream()
- {
- }
- virtual void Putc(char c) = 0;
- virtual void Puts(char* s) = 0;
- };
- class UartOStream: public OStream
- {
- private:
- UART_HandleTypeDef UARTHandle;
- public:
- UartOStream()
- {
- UARTHandle.Instance = USART2;
- UARTHandle.Init.BaudRate = 9600;
- UARTHandle.Init.WordLength = UART_WORDLENGTH_8B;
- UARTHandle.Init.StopBits = UART_STOPBITS_1;
- UARTHandle.Init.Parity = UART_PARITY_NONE;
- UARTHandle.Init.HwFlowCtl = UART_HWCONTROL_NONE;
- UARTHandle.Init.Mode = UART_MODE_TX_RX;
- UARTHandle.Init.OverSampling = UART_OVERSAMPLING_16;
- UARTHandle.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
-
- GPIO_InitTypeDef GPIO_InitStruct;
- /* Enable UART2 GPIO TX/RX clock */
- __HAL_RCC_GPIOA_CLK_ENABLE();
- /* Enable USART2 clock */
- __HAL_RCC_USART2_CLK_ENABLE();
- /* Configure USART2 Rx and Tx as alternate function */
- GPIO_InitStruct.Pin = GPIO_PIN_2 | GPIO_PIN_3;
- GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
- GPIO_InitStruct.Pull = GPIO_PULLUP;
- GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_MEDIUM; // GPIO_SPEED_FREQ_VERY_HIGH;
- GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
- HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
-
- /* Enable and set USART2 Interrupt to the highest priority */
- HAL_NVIC_SetPriority(USART2_IRQn, 1, 0);
- HAL_NVIC_EnableIRQ(USART2_IRQn);
-
- if(HAL_UART_Init(&UARTHandle) != HAL_OK)
- {
- //throw;
- while(1);
- }
- }
- virtual void Putc(char c)
- {
- HAL_UART_Transmit(&UARTHandle, (uint8_t *)&c, 1, 0xFFFF);
- }
- virtual void Puts(char *s)
- {
- while(*s)
- {
- Putc(*(s++));
- }
- }
- ~UartOStream()
- {
- char ADDR[18];
- sprintf(ADDR,"0x%08x\n",this);
- Puts("I AM BEING KILLED , I AM AT ");
- Puts(ADDR);
- }
- };
- class LedOStream :public OStream
- {
- private:
- int m_Interval;
- public:
- void SetInterval(int n){m_Interval = n;}
- ~LedOStream()
- {
- HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
- }
- LedOStream()
- {
- m_Interval = 0;
-
- GPIO_InitTypeDef gpioinitstruct;
- __HAL_RCC_GPIOA_CLK_ENABLE();
- /* Configure the GPIO_LED pin */
- gpioinitstruct.Pin = GPIO_PIN_5;
- gpioinitstruct.Mode = GPIO_MODE_OUTPUT_PP;
- gpioinitstruct.Pull = GPIO_NOPULL;
- gpioinitstruct.Speed = GPIO_SPEED_FREQ_HIGH;
- HAL_GPIO_Init(GPIOA, &gpioinitstruct);
- HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET);
- }
- virtual void Putc(char c)
- {
- if(c=='1')
- HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_SET);
- else if(c=='0')
- HAL_GPIO_WritePin(GPIOA,GPIO_PIN_5,GPIO_PIN_RESET);
-
- }
- virtual void Puts(char *s)
- {
- while(*s)
- {
- Putc(*(s++));
- int t = m_Interval;
- while(t--);
- }
- }
-
- };
- OStream & operator<<(OStream& stream,char c);
- OStream & operator<<(OStream& stream,char*s);
- extern UartOStream uartout;
- extern LedOStream led;
- #endif
复制代码 main.cpp
- #include "myio.hpp"
- #include "stm32l4xx_hal.h"
- char ADDR1[18];
- char ADDR2[18];
- char ADDR3[18];
- char ADDR4[18];
- static UartOStream uartouttest4;
- int main(void)
- {
- UartOStream uartouttest2;
- UartOStream *uartouttest3 = new(UartOStream);
- HAL_Init();
-
- sprintf(ADDR1,"0x%08x",&uartout);
- sprintf(ADDR2,"0x%08x",&uartouttest2);
- sprintf(ADDR3,"0x%08x",uartouttest3);
- sprintf(ADDR4,"0x%08x",uartouttest4);
-
- uartout << "uartout" << "ADDR = " << ADDR1 <<'\r' <<'\n';
- uartouttest2 << "uartouttest2" << "ADDR = " << ADDR2 << "\r\n";
- *uartouttest3 << "uartouttest3" << "ADDR = " << ADDR3 << "\r\n";
- uartouttest4 << "uartouttest4" << "ADDR = " << ADDR4 << "\r\n";
-
- led.SetInterval(200000);
- led<<"101010101010101010101";
- //while(1);
- return 1;
- }
复制代码
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