function invocation principle--Stack frames

Function call procedure------ Stack frames

Example: anatomy The principle of "comparing the size relationship between two numbers and returning a larger number":

Int max (int x, int y) {                  int z = 0;                  if  (x > y)                                   z = x;                  else                                  z = y;                  return z;} Int main () {                 int a = 10;                  int b = 20;                  int c  = 0;                 c = max (a, b);                 printf (  "%d\n",  c);                 system (  "pause");                  return 0;}

Analysis:

Figure One:

The main function is called by mainCRTStartup, so the ebp+1 of the main function stack frame is the mainCRTStartup stack frame EBP:

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Observe the esp=0018ff4c of mainCRTStartup ebp=0018ff88

Figure II:

The following figure is the process of mainCRTStartup calling main and the creation of the main function stack frame:

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Figure II:

This diagram is the creation of the Max function stack frame:

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Might

This image is the destruction process of the max stack frame after the Max function call is completed:

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Throughout the execution of the program, the function of the stack frame can be abstracted as, notice that the stack is from the high address to the low address walk:

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Because the stack is aligned, the compiler allocates more memory, which is wasted.

This article is from the "11132019" blog, please be sure to keep this source http://11142019.blog.51cto.com/11132019/1764882

function invocation principle--Stack frames