Questions concerning low-level aspects of a system: programming close to the underlying details and hardware.

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2
votes
6answers
413 views

What are memory addresses? [closed]

I have more or less 0 knowledge in low-level topics, so forgive my possible ignorance. I know that in languages such as C, pointers hold 'memory addresses', i.e. strings (or binary data?) written in ...
12
votes
4answers
2k views

Is there any danger in writing raw bytes to a file? [closed]

I'm working through a problem in Programming Pearls -- specifically, the implementation of a program which sorts a file containing, at most, 10,000,000 integers (Column 1, Problem 3). Since the book ...
0
votes
1answer
102 views

Is my 'variable-storing area' basically a 'heap'?

I'm planning to implement a simple VM/interpreter kind of thing for a simple language I'm making. The compiler of the language emits mostly stack-oriented instructions to be executed by the VM. The ...
0
votes
1answer
65 views

How does a stack VM manage with only one stack?

Lately I've been asking a lot of questions here about VMs. Here's another one: I understand that often stack based VMs use only one stack - the call stack - for everything. E.g. it is also used for ...
5
votes
3answers
246 views

What would the register-machine bytecode for this code look like?

I hope this kind of question isn't off-topic on this site. I'm finally getting the hang of what a stack based machine is, and how to compile code for it. For example, the following code: 2 * 5 + 1 ...
1
vote
2answers
135 views

Do VMs use one stack for everything? [duplicate]

Most VMs have a "call stack" to keep track of where to return from each function that was called. This is often simply regarded as "the stack". However often a stack is needed for operations that ...
2
votes
1answer
106 views

How do VMs implement function calling?

I'm reading a compiler textbook that compiles to some form of assembly. Since I don't know this assembly language I decided to invent my own simple "assembly language" and implement a basic "virtual ...
0
votes
3answers
180 views

Why do executables depend on the OS but not on the CPU?

If I write a C program and compile it to an .exe file, the .exe file contains raw machine instructions to the CPU. (I think). If so, how is it possible for me to run the compiled file on any computer ...
2
votes
7answers
3k views

Is a degree needed for low-level/embedded programming jobs? [closed]

I know that it is possible to get into software development without a degree in computer science, but is it possible (or rather, common) to be able to get an embedded programming job without the ...
-1
votes
2answers
94 views

What interface does python use to implement sockets?

When I programmed in python, I believe I interfaced with the transport layer using sockets. If python was programmed by humans, they must have used an interface that was "lower" than sockets, to ...
3
votes
4answers
413 views

I might be starting to do Arduino development and I would like some advice [closed]

So, today I looked at Arduino; seems very interesting. I still don't want to shell out the money just yet, as I have some questions, namely: Should I learn something about electronics? What and with ...
1
vote
0answers
38 views

Is a language that provides more abstractions to use it's own API, considered higher-level than a language that doesn't? [duplicate]

Consider two programming languages: Both run on a VM, have the same amount of abstraction levels between the programmer and the OS and CPU, etc. The only difference is inside the languages themselves ...
12
votes
5answers
2k views

Which languages are used today for low-level programming? [closed]

When I hear low-level programming, such as for drivers, embedded systems, operating systems, etc., I immediately think about C and perhaps C++. But mainly C. But what other languages are also used ...
8
votes
4answers
2k views

A good interpreted language for a small embedded project [closed]

I have an mbed microcontroller which has a small ARM Cortex M3 on it. Basically, my effective resources for the project are ~25 KB of RAM and ~400 KB of Flash. For I/O I'll have a PS/2 ...
0
votes
3answers
179 views

What is the absolute minimum set of instructions required to build a Turing complete processor

I have a general idea of how the processor handles instructions but spend my time working in mostly high level languages. Maybe somebody who works closer to the iron can provide some valuable insight. ...
0
votes
2answers
1k views

Are there any languages that have both high- and low-level facilities? [closed]

Are there any languages that have both high- and low-level facilities? If not, is it feasible to create one? Why or why not? In theory, it would be very helpful to have a programming language that ...
-1
votes
2answers
155 views

Difference between a pointer and a reference? [duplicate]

In Java and other high-level languages, a reference leads to an object. In C++, as far as I know, a pointer can also lead to an object. So what's the difference between a reference leading to an ...
1
vote
1answer
242 views

Next power of 2 for a number (in search for better “bit-twiddling” way)

I just wonder if there exists better (i.e. faster?) way to get the next power of 2 for a given number than the following one (maybe some better sort of "bit-twiddling" hack is possible?) ... static ...
1
vote
3answers
189 views

Question about moving to embedded systems [closed]

I currently work as a .net developer and have coming up to 3 years experience in the industry as well as a degree in computer science specifically software engineering (I know that means nothing but ...
-2
votes
2answers
401 views

Timeline of a programmer in terms of languages? [closed]

Alan Perlis once said: "A language that doesn't affect the way you think about programming, is not worth knowing". I am not proud of the fact that I started programming with scripting languages ...
36
votes
9answers
3k views

Why not have a High Level Language based OS? Are Low Level Languages more efficient?

Without being presumptuous, I would like you to consider the possibility of this. Most OS today are based on pretty low level languages (mainly C/C++) Even the new ones such as Android uses JNI & ...
9
votes
4answers
869 views

Why do some programmers categorize C, Python, C++ differently? - regarding level [duplicate]

I am taking an introductory course on python and the instructor says that python is a high level language and C and C++ are low level languages. It's just damn confusing. I thought that C, C++, ...
3
votes
1answer
155 views

Books/sources on inner workings of JavaScript [duplicate]

When I started studying C++ a couple of years ago, a lot of the books and texts I read did a very thorough job of explaining, how the code written would translate into concrete operations in the ...
37
votes
11answers
3k views

Why are cryptic short identifiers still so common in low-level programming?

There used to be very good reasons for keeping instruction / register names short. Those reasons no longer apply, but short cryptic names are still very common in low-level programming. Why is this? ...
3
votes
2answers
744 views

Memory management for fast message passing between threads in C++

Suppose there are two threads, which communicate by asynchronously sending data messages to each other. Each thread has some kind of message queue. My question is very low level: What can be expected ...
5
votes
3answers
1k views

How would one go about reading memory from a process? Is it different by OS?

As an experienced web-developer, but a novice "low level" programmer, this stuff is sort of voodoo to me still. I'm curious about how one would even begin to go about finding a memory block, and then ...
0
votes
1answer
768 views

Where can I find a punched card simulator? [duplicate]

Possible Duplicate: Learning to program on punchcards I wasn't born in the era, but I'd like to experience writing a program with punch cards. Does anyone know of a program or an online ...
24
votes
12answers
6k views

Were the first assemblers written in machine code?

I am reading the book The Elements of Computing Systems: Building a Modern Computer from First Principles, which contains projects encompassing the build of a computer from boolean gates all the way ...
6
votes
4answers
587 views

Low Level Exercises [closed]

I'm pretty comfortable with high-level languages and application development. However, although I have learned about low level topics such as the ones listed below, I have never done anything with ...
15
votes
8answers
2k views

Reverse engineering: what is it really good for? [closed]

I have some innocent/beginner questions: What is reverse engineering good for? As a programmer, should I learn the art of reverse engineering? What are the benefits to a programmer who is ...
16
votes
10answers
2k views

As a programmer, should I know low and high-level programming languages? [closed]

I been contacted to do some work remote controlling LEDs displays over TCP/IP, but my experience and preparation is mostly about high-level programming language. I said that to the person who contact ...
2
votes
1answer
521 views

How to start embedded development for developing a handheld game console?

I work as a iPhone app developer now, so I know a bit of c, c++ and objective c. Also have fiddled with Java and many other. All of them have been just high level application/games development. My ...
29
votes
11answers
1k views

Is it wise for a high level developer to spend time studying assembly? [closed]

It is clear that the knowledge of low level stuff is very important in our work. But in a situation where you're already developing commercial software on a high level, and when you already have a ...
1
vote
5answers
607 views

What kinds of low level knowledge matter? [closed]

I realize that this question is similar to Low level programming - what's in it for me, but the answers didn't really address my question well. Part from just an understanding, how exactly does your ...
10
votes
5answers
11k views

What Are Some Advantages/Disadvantages of Using C over Assembly?

I'm currently studying engineering in Telecommunications and Electronics and we have migrated from assembler to C in microprocessor programming. I have doubts that this is a good idea. What are some ...
12
votes
5answers
2k views

High level vs. low level programming. Do I really have to choose? [closed]

Every once in a while I'm asked in interviews which I like the best- low level or high level. It seems to me that the implicit message is that they are both a specialty and they want to know which ...
4
votes
4answers
1k views

Is it possible to automatically convert code from a low level language to a high level language?

I have seen several applications that claim to convert Java code to valid C or even C++. Converting from a high level language to a low level language is possible, no doubt about it. At least in ...
12
votes
8answers
928 views

What are the complexities of memory-unmanaged programming?

Or in other words, what specific problems did automated garbage collection solve? I've never done low-level programming, so I don't know how complicated can freeing resources get. Update - apologies ...
1
vote
1answer
294 views

Is there any example or resource explaining/showing code from High-level to Low-level to deep down Machine code?

I have been searching for an example over the internet that shows any operation like saving a file or drawing anything in UI or any other sort that shows the implementation from High-leve language ...
3
votes
2answers
403 views

Functional Low-Level language that can use a webkit view

TL;DR: I need to develop an app which should look kind of the same on desktop and as a website incarnation. Since I am a web dev and have never developed for desktop, I want to use a language that ...
29
votes
13answers
2k views

How good does a well-rounded programmer need to be with bit-wise operations? [closed]

I have been browsing some OpenJDK code recently and have found some intriguing pieces of code there that has to do with bit-wise operations. I even asked a question about it on StackOverflow. ...
6
votes
8answers
1k views

Will taking a job in web development prevent a low-level programming career? [duplicate]

I'm a computer science student in my last year, and I want to get a job, but have difficulties finding one in my city where I can use what I already know pretty well. There is a company which does ...
10
votes
6answers
4k views

Where can I learn more about Low Level Programming [closed]

So First of all, I did Graduate from a University with a B.S. in Computer Science, and while I feel I got a multitude of programming experience.....I really missed out on the SUPER low level stuff. I ...
12
votes
5answers
890 views

How can I get more experience with lower level programming?

I'm about 3 years experience as .NET developer, but I'm sad I haven't gotten to create anything that excites me because I'm just using puzzle pieces someone else has already created. I learned most ...
12
votes
4answers
947 views

What are the algorithms behind low pause GC?

Some languages, for exemple java, introduced a low pause GC. Those GC can do most of the work without pausing the whole world. This is obviously a quite hard problem because it require to analyze the ...
22
votes
13answers
3k views

Low level programming - what's in it for me?

For years I have considered digging into what I consider "low level" languages. For me this means C and assembly. However I had no time for this yet, nor has it EVER been neccessary. Now because I ...
9
votes
8answers
4k views

Learning computer architecture as a programmer [closed]

I typically run across gurus at SO and other places (instructors, book authors etc.) that would say something along the lines "This will cause alignment issues" or other low level tidbits. I want to ...
12
votes
8answers
1k views

How to deal with low level guys?

Recently I have started working for company which is developing mainly low level stuff (like device drivers, system level apps etc.). I was hired as high level programmer to develop a machine learning ...
1
vote
1answer
330 views

FPGA device + networking + software kit

Sorry for the very abstract and uncertain question, but I guess if I could ask it better I would have answered it myself. Here is the thing. I am getting more and more interested in FPGA. However, it ...
5
votes
3answers
1k views

What are the security risks/vulnerabilities every C programmer must be aware of?

There are many security risks coming from having close contact to the hardware as opposed to using well-tested and proved APIs from high level programming languages. It is much easier to cause a ...