Have you ever been interested in how breakpoints are implemented in a debugger?

Breakpoints in the debugger are implemented through debugging mechanisms that interact with the executable code at the level of machine instructions or bytecode. When a breakpoint is set, the debugger modifies the code or uses hardware capabilities of the processor to interrupt the program upon reaching a certain point of execution.

In Go, for example, the Delve debugger sets breakpoints by replacing an instruction at the desired location with a special interrupt command (int3 on x86). When the process reaches this instruction, control is transferred to the debugger, which stops execution and allows inspecting the program's state.

Thus, breakpoints are stop points implemented through instruction replacement or hardware triggers, enabling interactive analysis of program execution.