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cs61c intro

约 133 个字 10 行代码 6 张图片 预计阅读时间 1 分钟 共被读过 次

#cs61c #RISC-V

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  • Concurrent Thread
  • Parallel Thread
  • Parallel Instruction
  • Parallel Data

5 Great Ideas in Computer Architecture

  1. Abstraction (Layers of Representation/Interpretation)
  2. Moore’s Law (Designing through trends)
  3. Principle of Locality (Memory Hierarchy)
  4. Parallelism & Amdahl's law (which limits it)
  5. Dependability via Redundancy

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Sumery:

  • Binary, Decimal, Hex
  • Sign and Magnitude
  • One’s Complement
  • Two’s Complement
  • Bias
  • IEC Prefixes
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C
int *fn(void *, void *); // 这是一个返回 int* 类型的函数，不是函数指针
int (*fn)(void *, void *); // 这是一个指向返回 int 类型并接受两个 void* 参数的函数的指针
C
Bar* b = (Bar*) malloc(sizeof(Bar));
Bar* b = new Bar
C
int strlen(char*s){
    char*p= s;
    while(*p++)
        ;/* Null body of while*/
    return(p – s – 1);
}

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  • If you forget to deallocate memory: “Memory Leak””
    • Your program will eventually run out of memory
  • If you call free twice on the same memory: “Double Free”
    • Possible crash or exploitable vulnerabilityy
  • If you use data after calling free: “Use after free”
    • Possible crash or exploitable vulnerability