This pointer trap of windbg

This pointer trap of windbg

When you enter the class member function, this pointer does not immediately point to the object address. When you use this to set a memory breakpoint, this is a huge trap. The following class constructor is used as an example to analyze the assembly code in debug.

CPP source code is as follows:

Class node {public: node (); int data ;}; node: node () {int A = 10; A = (INT) This ;} void main () {node N; N. data = 100 ;}

The node n address is passed into the constructor through ECx:

After entering node: node, this value is not equal to ECx, view the address of this, found its address is just esp-0ch (before executing push EBP), and is fixed, in the debug version, this point is universal.

The subsequent code will affect this twice: