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May 10, 2009 · An assembler is direct mapping of machine code and therefore assembly language it produces is always machine dependent. On the contrary, we can write more than one versions of a compiler for different machines. So to run our code independently of machine, we must compile same code but on the compiler version written for that machine.
Notice that some compilers are indeed generating directly machine code, and some of them are even generating machine code in the same process that is running the compiler (a typical example of that last case is the SBCL implementation of Common Lisp: every time you interactively type some expression in its REPL, it is getting translated to machine code then executed).
- Introduction
- Compilation Phases
- Compiler vs. Interpreter
- Compiler Examples
- Conclusion
Programming languages were created to allow developers to write human-readable source code. However, computers work with machine code, which people can hardly write or read. Thus, compilers translate the programming language’s source code to machine code dedicated to a specific machine. In this article, we’ll analyze the compilation process phases....
As we already mentioned, the compilation process converts high-level source code to a low-level machine code that can be executed by the target machine. Moreover, an essential role of compilers is to inform the developer about errors committed, especially syntax-related ones. The compilation process consists of several phases: 1. Lexical analysis 2...
As we already know, the compiler converts high-level source code to low-level code. Then, the target machine executes low-level code. On the other hand, the interpreter analyzes and executes source code directly.An interpreter usually uses one of several techniques: 1. Analyzes (parses) the source code and executes it directly. 2. Converts high-lev...
4.1. Javac
In Java, source code is first compiled to the bytecode by the javaccompiler. Then, a Java Virtual Machine (JVM) interprets and executes bytecode. So, javac is an excellent example of a compiler that belongs to an interpreter system. Such a system makes Java portable and multiplatform. Moreover, there are other languages like Kotlin or Scala that are also compiled to bytecode, but these use unique compilers. Thus, the JVM can execute code that was originally written using different technologies.
4.2. Mono
Monois a toolset, including a C# programming language compiler, for executing software dedicated to the .NET Platform. It was created to allow .NET applications to run on different platforms. Moreover, an important goal was to give developers working on Linux a better environment and tools for working with the .NET platform. A compiler converts C# source code into an intermediate bytecode. After that, the virtual machine executes it. Both the C# compiler and virtual machine belong to the Mono...
4.3. GNU Compiler Collection
The GNU Compiler Collection (GCC) is a set of open-source compilers that belong to the GNU Project. These compilers could run on different hardware and software platforms. Therefore, they can generate machine code for various architectures and operating systems. During compilation, GCC is responsible for processing arguments, calling the compiler for the specific programming language, running the assembler program, and eventually, running a linker to produce an executable binary. GCC consists...
In this article, we described a compiler’s role. Further, we went through all phases of the compilation process. Then we discussed differences between a compiler and interpreter. Finally, we mentioned some real-world compiler examples.
Jun 10, 2018 · We compile to assembly because a single assembler can produce machine code for either one, or a few different CPU architectures. ... Our variable stayed in because we did not compile with ...
Jan 20, 2023 · A compiler is a computer program that translates from one format to another, most often from a high-level computer language to byte code and machine code. Compilers come in a number of variations ...
See [Section 5.2.1] for some examples of machine code translated directly from intermediate language. This code is an example of a flow dependence. I describe dependencies in detail in [Section 3.1.1]. If a compiler does sufficient interprocedural analysis, it can even optimize variables across routine boundaries.
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Sep 12, 2018 · Here, we see that the preprocessor stripped main.c of its comments while replacing the macro variable MESSAGE with its defined value.. 2. Compiler. After preprocessing, the newly-filtered file is ...
