C Memory

memory alignment（内存对齐）

  • Memory alignment: a system-dependent rule that tells us where data
    can be stored (usually not at every byte)

  • Can be accomplished with the “aligned” attribute
    __attribute__((aligned(n)));

Strings

  • Example: The string “Hi” is stored in memory as an array of characters. This array would look like: {‘H’, ‘i’, ‘\0’}

  • If the null terminator is missing, C will continue to read memory as if
    it was part of the string until it comes across a byte that happens to have value 0.

  • This is a very common source of bugs.