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README.md

TL;DR

  • How does the C++ function stack work?
  • What are %rbp and %rsp?

Video Overview

  • %rbp - register base pointer (starting point of stack for current fn)
  • %rsp - register stack pointer (end point of stack for current fn)
  • clang++ -g -mno-red-zone main.cpp -o main
    • -mno-red-zone to prevent %rsp compiler optimization

Helpful LLDB Commands

(lldb) p/x $rbp
# (unsigned long) 0x00007ff7bfefec40

(lldb) x/x $rbp-0x8
# 0x7ff7bfefec38: 0x00000001

(lldb) x/4xd $rbp-0x14
# 0x7ff7bfefec2c: 4
# 0x7ff7bfefec30: 3
# 0x7ff7bfefec34: 2
# 0x7ff7bfefec38: 1

Titles

  • How do C++ stack frames work anyway?

  • C++ Internals: How %rbp and %rsp Manage the Function Stack Frame

  • C++ Stack Frame Setup and Teardown Explained

  • How do stack frames work in C++?

  • How does the Stack Frame work in C++?

  • How is the stack frame initialized for fn calls in C++?

  • What is the C++ Stack Frame and how does it work?

  • C++ Deep Dive: Function Stack Frames

  • What is a Stack Frame in C++?

  • C++ Stack Frames Explained (rbp vs rsp in x86 assembly)

References

  • ChatGPT and Gemini
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