SuboptimalEng · SuboptimalEng · Oct 14, 2025 · Oct 14, 2025 · Oct 14, 2025 · Oct 14, 2025
diff --git a/000-template/Makefile b/000-template/Makefile
@@ -0,0 +1,5 @@
+all:
+	clang++ -std=c++17 -g main.cpp -o main
+
+clean:
+	rm -rf main *.dSYM
diff --git a/000-template/README.md b/000-template/README.md
@@ -0,0 +1,33 @@
+# UB - Uninitialized Local Variable
+
+## TL;DR
+
+- In the C++ on Sea keynote, Herb Sutter showed some code with undefined behavior in C++
+- Turns out that C++ can have UB when reading a local variable that is uninitalized
+- I was confused by this and decided to investigate further by looking into the assembly code
+- The point of this investigation is to learn what's happening under the hood in the compiler
+- (Note that this issue will be fixed by default in C++ 26 which is great!)
+
+## Video Overview
+
+- Start by recreating the C++ code from Herb's slide
+- Go over the C++ code and explain what we expect to happen vs what actually happens
+- Run the code to ensure the undefined behavior (as expected :P)
+- Turn on `ftrivial-auto-var-init=zero` flag and confirm that UB is NOT there anymore
+  - This flag basically ensures that
+  - These flags are default to true in C++ 26
+  - So we can expect them to be gone with no code changes in the future
+- Investigate the assembly for UB code
+- Investigate the assembly diff for non-UB code
+
+## Helpful LLDB Commands
+
+## Sample Assembly Code
+
+## Titles
+
+## References
+
+- Herb Sutter's Keynote at C++ on Sea - https://www.youtube.com/watch?v=kKbT0Vg3ISw
+- Herb Sutter's Website - https://herbsutter.com/
+- ChatGPT and Gemini
diff --git a/000-template/main.cpp b/000-template/main.cpp
@@ -0,0 +1,9 @@
+#include <iostream>
+
+int main() {
+  int a = 1;
+  int b = 2;
+  int c = 5;
+  std::cout << "sum -> " << a + b + c << std::endl;
+  return 0;
+}
diff --git a/010-ub-for-uninitialized-var/README.md b/010-ub-for-uninitialized-var/README.md
@@ -73,13 +73,13 @@ main`f1:
 # Process 4758 stopped
 ```
 
+## Titles
+
+- How C++ 26 Fixes Undefined Behavior for Unintialized Local Variables
+- How C++ Prevents Undefined Behavior for Uninitialized Local Variables
+
 ## References
 
 - Herb Sutter's Keynote at C++ on Sea - https://www.youtube.com/watch?v=kKbT0Vg3ISw
 - Herb Sutter's Website - https://herbsutter.com/
 - ChatGPT and Gemini (if these count)
-
-## Title
-
-- How C++ 26 Fixes Undefined Behavior for Unintialized Local Variables
-- How C++ Prevents Undefined Behavior for Uninitialized Local Variables
diff --git a/010-ub-for-uninitialized-var/main b/010-ub-for-uninitialized-var/main
diff --git a/010-ub-for-uninitialized-var/main.dSYM/Contents/Info.plist b/010-ub-for-uninitialized-var/main.dSYM/Contents/Info.plist
diff --git a/010-ub-for-uninitialized-var/main.dSYM/Contents/Resources/DWARF/main b/010-ub-for-uninitialized-var/main.dSYM/Contents/Resources/DWARF/main
diff --git a/010-ub-for-uninitialized-var/main.dSYM/Contents/Resources/Relocations/x86_64/main.yml b/010-ub-for-uninitialized-var/main.dSYM/Contents/Resources/Relocations/x86_64/main.yml
diff --git a/011-lldb-init-settings/Makefile b/011-lldb-init-settings/Makefile
@@ -0,0 +1,5 @@
+all:
+	clang++ -std=c++17 -g main.cpp -o main
+
+clean:
+	rm -rf main *.dSYM
diff --git a/011-lldb-init-settings/README.md b/011-lldb-init-settings/README.md
@@ -0,0 +1,44 @@
+# LLDB Init Settings
+
+## TL;DR
+
+- It is tedious to set up LLDB commands every time you compile C++ code (or re-open LLDB)
+- For example, you may need to run these 2 commands on restart (every time)
+  - `b main` (break point at main)
+  - `target stop-hook add -o "disassemble"` (show assembly)
+- You can avoid this repetitive process by adding creating the `~/.lldbinit` file
+
+## Video Overview
+
+- Go over sample C++ code
+- Show how to run LLDB by using `-g` compiler flag
+- Show the need for using `b main` and `target stop-hook add -o "disassemble"`
+- Change code, recompile, re-run LLDB, and notice that the settings are lost
+- Show how setting up the `~/.lldbinit` file solves this problem
+
+## LLDB Init Settings
+
+- Add this to `~/.lldbinit` file
+
+```bash
+# file -> ~/.lldbinit
+
+# break point at main
+breakpoint set --name main
+
+# show assembly by default
+target stop-hook add -o "disassemble"
+
+# use this instead if you want to see 10 lines of assembly at program counter
+# target stop-hook add -o "disassemble --pc --count 10"
+```
+
+## Titles
+
+- How to Improve LLDB Debugger Developer Experience?
+- How to Improve LLDB (gdb) Developer Experience for Debugging?
+- How to Improve LLDB (GDB) Developer Experience with Custom Settings
+
+## References
+
+- ChatGPT
diff --git a/011-lldb-init-settings/main.cpp b/011-lldb-init-settings/main.cpp
@@ -0,0 +1,9 @@
+#include <cstdio>
+
+int main() {
+  int a = 1;
+  int b = 5;
+  int c = 6;
+  printf("sum -> %d\n", a + b);
+  return 0;
+}