According to Wikipedia, Machine code or machine language is a set of instructions executed directly by a computer's central processing unit (CPU). Each instruction performs a very specific task, such as a load, a jump, or an ALU operation on a unit of data in a CPU register or memory. Every program ...
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5answers
562 views
Compilation to bytecode vs machine code
Does compilation that produces an interim bytecode (like with Java), rather than going "all the way" to machine code, generally involve less complexity (and thus likely take less time)?
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votes
1answer
80 views
How can I learn microcoding? [closed]
I am interested in learning microcode because I want to know exactly how the components of a computer,especially the CPU,works...So I need to learn microcoding and assembly.
There are a few assembly ...
0
votes
2answers
61 views
comparison of computer processing language vs protocol
how can explain the diference between programming languge and protocol?,
can protocol have extension?
we know that machines communicate with protocol, but they can also do so with expressive ...
10
votes
1answer
202 views
Machine code JITs and the Execution Disable bit
How is runtime-generated machine-code (such as the output of a JIT), actually executed by the CPU if the CPU/OS has an Execution Disable bit?
As far as I know, many modern processors and Operating ...
3
votes
3answers
465 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 ...
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1answer
243 views
How does an optimizing compiler react to a program with nested loops?
Say you have a bunch of nested loops.
public void testMethod() {
for(int i = 0; i<1203; i++){
//some computation
for(int k=2; k<123; k++){
...
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votes
2answers
200 views
Is it possible to implement a native compiler for a 'managed language' such as Java?
In most cases, it is possible to create both a native compiler and an interpreter for a programming language. The compiler would simply convert the source code to machine code, and the interpreter ...
18
votes
6answers
4k views
Is machine language always binary? [duplicate]
I know absolutely nothing in low-level stuff, so this will be a very newbie question. Please excuse my ignorance.
Is machine language - the series of numbers to that tell the physical computer ...
9
votes
5answers
2k views
Do compiler-writers actually need to 'understand' machine code? [closed]
Might be kind of an odd question.
A guy writing a C++ compiler (or whatever non-VM language): Does he need to be able to read/write raw machine language? How does that work?
EDIT: I am specifically ...
0
votes
1answer
352 views
Creating a very basic compiler using Java
I want to try and create my own very basic language, with it's very basic compiler. All using Java.
For now, it will only need to enable to 'programmer' to print things to the screen.
I had an idea ...
10
votes
4answers
3k views
Why can't native machine code be easily decompiled?
With bytecode-based virtual machine languages like Java, VB.NET, C#, ActionScript 3.0, etc., you hear sometimes about how easy it is to just go download some decompiler off the Internet, run the ...
0
votes
4answers
800 views
How does assembly relate to machine/binary code
How does assembly relate to machine/binary code.
For example here is how to print to the screen in mikeOS(a small pure assembly OS), mikeOS it uses NASM to assemble.
BITS 16
ORG 32768
...
0
votes
1answer
259 views
Fetching instructions from memory
So, I am a noob in assembly language and machine instructions.
When the discussion came up as to how funtion calls are implemented at the processor level, someone said that the CALL instruction ...
1
vote
1answer
177 views
What did machine code for 4-bit architecture look like?
I don't know how a 4-bit instruction could be enough to do something so I read about the Intel 4004 and it says that it used 8-bit instructions and then I can understand how opcode and numbers has ...
3
votes
3answers
299 views
Is it possible to use GNU GPL for application that has no source?
I mean, it is possible to create application without source code - for example using HEX editor or some debugger that can assembly instructions (actually every decent debugger can).
Creating programs ...
2
votes
1answer
846 views
Do compilers have to be written for each model of CPU?
Do you need to take account of the different processors and their instructions when writing a compiler? Have instructions been standardised? Or what tools and techniques are available to assist with ...
13
votes
4answers
3k views
How is software for machines such as ATMs or TVs built?
As a beginner programmer I've only worked with programming computer based applications, but a question has been coming to my head very often since I started programming and I can't get it answered ...
18
votes
9answers
17k views
Resources on learning to program in machine code? [closed]
I'm a student, fresh into programming and loving it, from Java to C++ and down to C. I moved backwards to the barebones and thought to go further down to Assembly.
But, to my surprise, a lot of ...
1
vote
1answer
368 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 ...
