C语言写个简单的虚拟机

伪代码:
寄存器用变量表示内存用数组表示
定义宏定义为操作码功能
1.数据定义
2.打印功能
3.错误判断

1.数据定义
{
定义寄存器
定义计数器
定义指针寄存器(指向下一条将要执行的指令EIP)
定义操作码
定义操作数

}

2.打印函数
{
打印信息

}
3.错误判断
{
判断是否溢出
判断除数
}

main函数
{
do
{
do{

 }whlie
}whlie
输入do{
SWITCH语句执行操作}(操作码不等于43)

}

#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <stdbool.h>#define NUMBER 100
#define FLAG -9999/*操作码*/
#define READ 10
#define WRITHE 11#define LOAD 20
#define STORE 21/*算术操作*/
#define ADD 30
#define SUBTRACT 31
#define DIVIDE 32
#define MULTIPLY 33/*控制操作*/
#define BRANCH 40
#define BRANCHNEG 41
#define BRANCHZERO 42
#define HALT 43 //打印函数
void printfmycomputer(int memory[], int accumulator, int instructionCounter,int instructionRegister, int operationCode, int operand);bool errZero(int operand);//除0错误判断
bool errAccumulator(int accumulator);//累加器溢出错误
bool errorOperandCode(int operationCode);//操作码错误int main() {printf("*** Hi there!***\n""*** 请每次输入一条指令或一条数据 ***\n""*** 在指令或数据前将会打上位置编号和‘？’ ***\n""*** 然后在该位置输入对应的一个‘word’ ***\n""*** 当输入哨兵值 - 9999 时，停止输入 ***\n""*** your program. ***\n\n");int memory[NUMBER] = { 0 }; //内存初始化/*寄存器值初始化*/int accumulator = 0;          //累积器int instructionCounter = 0;   //内存编号int instructionRegister = 0;  //‘word'int operationCode = 0;        //操作码int operand = 0;              //位置编号 /*打印内存*/printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);printf("\n\n");do {do {printf("%02d ? +", instructionCounter);scanf("%d", &memory[instructionCounter]);if (memory[instructionCounter] > 9999 || memory[instructionCounter] < -9999)printf("输入错误，请重新输入！\n");} while (memory[instructionCounter] > 9999 || memory[instructionCounter] < -9999);++instructionCounter;} while (memory[instructionCounter-1]!=FLAG);//内存结束printf("\n*****程序开始执行****\n");instructionCounter = 0;do {instructionRegister = memory[instructionCounter];operationCode = instructionRegister / 100; //取操作码if (errorOperandCode(operationCode)== false){operationCode = 43;//结束程序printf("\n***操作码错误***\n");}operand = instructionRegister % 100;switch (operationCode){case 10:printf("?");scanf("%d", &memory[operand]);printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);++instructionCounter;break;case 11:printf("%d\n", memory[operand]);printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);++instructionCounter;break;case 20:accumulator = memory[operand];printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand); ++instructionCounter;break;case 21:memory[operand] = accumulator;accumulator = memory[operand];printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);++instructionCounter;break;case 30:accumulator += memory[operand];if (errAccumulator(accumulator)== true){operationCode = 43;printf("\n***累加器满了***\n");break;}else{printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);++instructionCounter;break;}case  31:accumulator -= memory[operand];if (errAccumulator(accumulator) == true){operationCode = 43;printf("\n***累加器满了***\n");break;}else{printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);++instructionCounter;break;}case 32:if (errZero(operand) == true){operationCode = 43;printf("\n***除数为0***\n");break;}accumulator /= memory[operand];if (errAccumulator(accumulator) == 0){operationCode = 43;printf("\n***累加器溢出错误***\n***程序将终止执行!\n");break;}else{printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);++instructionCounter;break;}case 33:accumulator *= memory[operand];if (errAccumulator(accumulator) == 0){operationCode = 43;printf("\n***累加器溢出错误***\n***程序将终止执行!\n");break;}else{printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);++instructionCounter;break;}case 40:instructionCounter = operand;printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);break;case 41:if (accumulator < 0){instructionCounter = operand;}else {++instructionCounter;printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand); break;}case 42:if (accumulator == 0){instructionCounter = operand;}else{++instructionCounter;printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);break;}case 43:instructionCounter = operand;printf("done\n");printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand);break;default:printf("输入错误，请重新输入！\n");printfmycomputer(memory, accumulator, instructionCounter,instructionRegister, operationCode, operand); break;}} while (operationCode != 43);return 0;
}void printfmycomputer(int memory[], int accumulator, int instructionCounter,int instructionRegister, int operationCode, int operand) {printf("REGISTERS:\n");printf("accumulator          %+05d\n", accumulator);printf("instructionCounter      %02d\n", instructionCounter);printf("instructionRegister  %+05d\n", instructionRegister);printf("operationCode           %02d\n", operationCode);printf("operand                 %02d\n\n", operand);printf("MEMORY:\n");printf("\t0     1     2     3     4     5     6     7     8     9\t");for (int i = 0; i < 100; i++){if (i % 10 == 0){printf("\n");printf("%2d  ", i);}printf("%+05d ", memory[i]);}printf("\n\n");}//判断操作码
bool errorOperandCode(int operationCode)
{if (operationCode == 10 || operationCode == 11 || operationCode == 20|| operationCode == 21 || operationCode == 30 || operationCode == 31|| operationCode == 32 || operationCode == 33 || operationCode == 40|| operationCode == 41 || operationCode == 42 || operationCode == 43){return true;}return false;}bool errAccumulator(int accumulator)
{if (accumulator > 9999 || accumulator < -9999){return true;}return false;
}//判断0
bool errZero(int operand) {if (operand == 0){return true;}return false;}

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