Calendar

Below is a preview of the week-by-week plan for the quarter. There may be adjustments and rearrangements as we go.

Lecture Code

Any code examples worked in class will be posted after lecture into `/afs/ir/class/cs107/lecture-code/lect[N]` where you replace `[N]` with the lecture number. You can make a copy to compile or modify by doing the following, which will make a folder in the current location called `lect[N]` that is a copy of the `lect[N]` code.

``````cp -r /afs/ir/class/cs107/lecture-code/lect[N] lect[N]
``````

Week 1
Lecture 1 (Mon 4/1): Welcome to CS107!
We'll go through course logistics, learning goals, and a tour of Unix and the command line.
Lecture 1 Slides
Handouts: Syllabus, Honor Code
Lecture Video
B&O Ch 1 - skim this chapter for a quick overview of what is meant by systems, and for a preview of topics to come.
Out: assign0
Lecture 2 (Wed 4/3): Unix and C We'll get started with the command line and introduce the C programming language. Lecture 2 Slides
Lecture 2 Code
Lecture Video
No labs this week.
Lecture 3 (Fri 4/5): Integers, Bits and Bytes

Topic 1: How can a computer represent integer numbers?
We'll learn about the representation of the integer types: `char`, `short`, `int`, and `long`, in both unsigned and two's complement signed. We'll discuss binary, hexadecimal, integer arithmetic and overflow.
Lecture 3 Slides
Lecture 3 Code
Lecture Video
Lecture Quiz
B&O Ch 2.2-2.3 - skim the formal proofs, but it's important to take away a solid working knowledge of two's complement and behaviors of integer operations.
Week 2
Lecture 4 (Mon 4/8): Bitwise Operators
We'll wrap up integer representations by discussing truncation, sign extension and how mixed signed and unsigned comparison operations work. Then we'll see how to manipulate bits and bytes using bitwise operators.
Lecture 4 Slides
Lecture Video
Lecture Quiz
B&O Ch 2.1
In: assign0
Out: assign1
Lecture 5 (Wed 4/10): More Bitwise Operators
We'll learn about the `<<` `>>` shift operators and how to use GDB to examine the execution of our programs.
Lecture 5 Slides
Lecture 5 Code
Lecture Video
Lecture Quiz
Lab 1: Bits and `ints` Be sure to check out our guide to gdb.
Lecture 6 (Fri 4/12): Chars and C-Strings
Topic 2: How can a computer represent and manipulate more complex data like text?
We'll explore how strings and characters are manipulated in C using the `char` and `char *` types, discuss null termination, and become familiar with the `string.h` functions.
Lecture 6 Slides
Lecture 6 Code
Lecture Video
Lecture Quiz
K&R (1.9, 5.5, Appendix B3) or Essential C section 3 for C-strings and `string.h` library functions. C-strings are primitive compared to Java/C++ strings, so take note of the manual efforts required for correct use and pitfalls to avoid.
Week 3
Lecture 7 (Mon 4/15): C-Strings, Buffer Overflows and Security
Lecture 7 Slides
Lecture 7 Code
Lecture Video
Lecture Quiz
Lecture 8 (Wed 4/17): C-Strings, Valgrind and Pointers
We'll introduce the Valgrind memory analysis tool for spotting memory errors. Then we'll dig deeper into C strings and learn more about how C strings are examples of arrays and pointers.
Lecture 8 Slides
Lecture 8 Code
Lecture Video
Lecture Quiz
K&R Ch 1.6, 5.5 or Essential C section 3 on the mechanics of pointers and arrays. Pay special attention to the relationship between arrays and pointers and how pointers/arrays are passed as parameters.
In: assign1
Out: assign2
Lab 2: C-Strings Be sure to check out our guide to Valgrind.
Lecture 9 (Fri 4/19): Arrays and Pointers
Topic 3: How can we effectively manage all types of memory in our programs?
We'll answer questions like: how are arrays and pointers the same? How are they different? How is an array/pointer passed/returned in a function call? After this lecture, you'll understand how arrays and pointers allow two syntaxes for accessing sequential memory locations, but the underlying reality of the memory is the same.
Lecture 9 Slides
Lecture 9 Code
Lecture Video
Lecture Quiz
K&R 5.2-5.5 or Essential C section 6 on advanced pointers
Week 4
Lecture 10 (Mon 4/22): Stack and Heap
We'll introduce dynamic allocation on the heap with `malloc`, compare the stack and the heap, and get practice using dynamic allocation.
Lecture 10 Slides
Lecture Video
Lecture Quiz
K&R 5.6-5.9 or Essential C section 6 on the heap. The key concept is comparing and contrasting stack and heap allocation.
Lecture 11 (Wed 4/24): Stack and Heap, Continued
We'll continue discussing heap allocation, learn how to free memory with `free`, and talk about resizing heap allocations with `realloc`.
Lecture 11 Slides
Lecture 11 Code
Lecture Video
Lecture Quiz
In: assign2
Out: assign3
Lab 3: Arrays/Pointers
Lecture 12 (Fri 4/26): Disclosure, Partiality, Generics and `void *`
Topic 4: How can we use our knowledge of memory and data representation to write code that works with any data type?
We'll introduce untyped `void *` pointers and motivate C generics. We'll also discuss vulnerability disclosure, use-after-free bugs and partiality.
Lecture 12 Slides
Lecture 12 Code
Lecture Video
Lecture Quiz
Week 5
Lecture 13 (Mon 4/29): More Generics and Function Pointers
We'll continue discussing generics and introduce function pointers, which allow us to pass functions as parameters and store them in variables.
Lecture 13 Slides
Lecture 13 Code
Lecture Video
Lecture Quiz
K&R 5.11, review man pages or your C reference to be introduced to generic functions in the C library (`qsort`, `lfind`, `bsearch`)
Lecture 14 (Wed 5/1): Function Pointers, Continued
We'll continue discussing generic function pointers and do examples of how to write and call functions with function parameters.
Lecture 14 Slides
Lecture 14 Code
Lecture Video
Lecture Quiz
In: assign3
Out: assign4
Lab 4: `void *`/Function Pointers
Lecture 15 (Fri 5/3): Intro to x86-64, Data Movement
Topic 5: How does a computer interpret and execute C programs?
We'll introduce assembly/machine language and find out what's happening underneath the hood of the C compiler, including a discussion of the x86-64 instruction set architecture and its powerful `mov` instruction, along with addressing modes, data layout, and access to variables of various types.
Lecture 15 Slides
Lecture 15 Code
Lecture Video
Lecture Quiz
B&O 3.1-3.3 for background info on x86-64 assembly. Very carefully read B&O 3.4 on addressing modes and data transfer. The multitude of addressing modes is one of the things that puts the first "C" in CISC.
Be sure to check out our x86-64 guide.
Week 6
Lecture 16 (Mon 5/6): x86-64 ALU
We'll talk about arithmetic and logical instructions.
Lecture 16 Slides
Lecture Video
Lecture Quiz
B&O 3.5-3.6
Be sure to check out our x86-64 guide.
(Tues) Midterm Exam
Lecture 17 (Wed 5/8): More x86-64 ALU
We'll continue talking about arithmetic and logical instructions and do practice reverse engineering examples.
Lecture 17 Slides
Lecture 17 Code
Lecture Video
Lecture Quiz
B&O 3.5-3.6
Be sure to check out our x86-64 guide.
Lab 5: Assembly
x86-64 in all its glory
Be sure to check out our x86-64 guide.
Lecture 18 (Fri 5/10): x86-64 Condition Codes and Control Flow
We'll see how to implement C `if`/`else` in assembly.
Lecture 18 Slides
Lecture 18 Code
Lecture Video
Lecture Quiz
B&O 3.6
Be sure to check out our x86-64 guide.
Week 7
Lecture 19 (Mon 5/13): x86-64 Control Flow, Continued
We'll continue exploring loops and conditions in assembly and discuss other uses of condition codes (`setx`/`cmov`).
Lecture 19 Slides
Lecture 19 Code
Lecture Video
Lecture Quiz
B&O 3.7, 5.1-5.6
Be sure to check out our x86-64 guide.
Lecture 20 (Wed 5/15): x86-64 Runtime Stack
We'll talk about procedures and the runtime stack along with instructions for call/return, parameter passing, local stack storage, and register use.
Lecture 20 Slides
Lecture 20 Code
Lecture Video
Lecture Quiz
In: assign4
Out: assign5
Lab 6: Runtime Stack
Fun explorations with the stack!
Lecture 21 (Fri 5/17): Reverse Engineering
We'll discuss assign5's focus on reverse engineering executables. We'll do lots of reverse engineering practice to get you up to speed on assign5!
Lecture 21 Slides
Lecture 21 Code
Lecture Video
Lecture Quiz
Be sure to check out our x86-64 guide.
Week 8
Lecture 22 (Mon 5/20): Privacy, Trust and Managing the Heap
Topic 6: How do core memory-allocation operations like `malloc` and `free` work?
We'll have larger discussions of privacy and trust, and then move on to our final main topic. We'll see how the heap fits into the address space and introduce design decisions for implementing `malloc`/`realloc`/`free`, as well as performance tradeoffs (throughput, utilization).
Lecture 22 Slides
Lecture Video
Lecture Quiz
B&O Ch. 9.9 and 9.11 cover heap allocation implementation and memory misuses. There's lots of very useful detail in 9.9 for your heap allocator!
Lecture 23 (Wed 5/22): Managing the Heap, Continued
We'll learn about 3 different heap allocator designs: the bump allocator, the implicit free list allocator, and the explicit free list allocator, and compare them and discuss performance tradeoffs (throughput, utilization).
Lecture 23 Slides
Lecture Video
Lecture Quiz
Optimally skim B&O Ch. 5
No labs this week.
Lecture 24 (Fri 5/24): Explicit Free List Allocator
We'll learn more about the explicit free list allocator design, and other techniques employed by allocators including coalescing and in-place realloc. We'll also talk more about the requirements for assign6.
Lecture 24 Slides
Lecture Video
Lecture Quiz
In (Sat): assign5
Out: assign6
Week 9
Mon 5/27 - No Lecture - MEMORIAL DAY HOLIDAY
Lecture 25 (Wed 5/29): Optimization
We'll explore the compilation process and the various optimizations GCC does on our behalf. We'll also learn of some tools we can use to profile our own code so we know where to optimize ourselves. This could be helpful for final tuning of your heap allocator!
Lecture 25 Slides
Lecture 25 Code
Lecture Video
Lecture Quiz
Lab 7: Code and Memory Optimization
Experiments in optimization and profiling
Be sure to check out our CS107 guide to callgrind.
Fri 5/31 - No Lecture In: assign6 checkpoint
Week 10
Lecture 26 (Mon 6/3): Wrap-up and Q&A
We'll wrap up the course themes, preview courses and opportunities post-107, and say some final words. Bring questions if you have them!
Lecture 26 Slides
Lecture 26 Code
CS107 Recap Page
Lecture Video
Lecture Quiz
Wed 6/5 - No Lecture In (Wed): assign6
No labs this week.
Final Exam Week
Final Exam: Monday June 10 3:30PM-6:30PM