Introduction
Computer programs are usually written in high-level languages, and programmers need tools to convert these languages into machine–readable code. Compilers and Interpreters are fundamental tools that help translate programming languages into code that a machine can read and understand. Based on this, programming languages can be broadly categorized into Compiled and Interpreted. In this blog, we’ll understand what compilers and interpreters are and know the difference between the two.
Compiled and Interpreted Programming Languages
Compiled programming languages are those where the source code is compiled into machine code before it is executed through a compiler. These languages offer optimized performance. Here are a few well-known compiled programming languages:
- C++
- C
- C#
- Java
- Fortran
- Visual Basic
- Objective-C
On the other hand, interpreted programming languages are the ones that execute the source code directly. Interpreted languages are executed line by line through an interpreter, allowing for greater flexibility and ease of debugging.
Here are a few interpreted programming languages:
- Python
- Ruby
- JavaScript
- Perl
- Lisp
- REXX
- BASIC
What is a Compiler?
A compiler converts the entire program into object code, which is then stored in a file. The object code, also called binary code, can be directly executed by the machine after linking. The source code of a compiled language is not useful for running the code once a program is compiled.
Here is an example of a code compiled in C language.
What is an Interpreter?
Instructions written in a programming or scripting language are directly executed by an interpreter without the need to convert them into an object code or machine code. For programs that use interpreted languages, the source code is required to run the program every time.
Here is an example of an interpreted Python code.
Compilers and interpreters are two fundamental tools that play an important role in translating and executing code. You can think of them as tools that help translate high-level languages into low-level codes that computers can understand.
Compilers vs. Interpreters: Types
Single-Pass and Multi-Pass Compilers
Single-pass compilers generate code in a single pass, processing source code sequentially. On the other hand, multi-pass compilers need multiple phases that allow advanced optimizations but consume more memory time.
Source-to-Source Compilers
The code is translated from one high-level programming language to another. It helps with cross-platform compatibility and language migration.
Cross Compilers
These compilers allow code generation for a target architecture or platform different than the one on which the compilation is done.
Dynamic Translators
These convert code from one architecture into another and are used in emulators and virtual machines. Dynamic translators make it possible to run software on different hardware.
Native Compilers
These help in optimal performance. Here, the machine code produced can be directly executed by the host system’s hardware.
Ahead-of-Time (AOT) Compilers
These compilers help in converting the whole program into machine code before execution. It results in consistent performance owing to faster startup times.
Just-In-Time (JIT) Compilers
These are used by machines with Java or .NET. These compilers translate code at runtime into machine code for immediate execution. JIT compilers offer the benefits of interpretation and compilation.
Optimizing Compilers
Optimizers analyze the code so that different optimization techniques, such as loop unrolling, constant folding, and inline expansion, can be applied. This helps in enhancing the speed and efficiency of the compiled program.
Incremental Compilers
These are only used to recompile portions of the revised codebase. It reduces compilation time during development.
Types of Interpreters
Interactive Interpreters
Interactive interpreters make it possible to feed and execute code interactively and receive immediate feedback.
Sequential Interpreters
These interpreters execute source code in the order it’s written, line by line.
Batch Interpreters
These are used for running scripts or automating tasks, and they execute the instructions or a program all at once.
Concurrent Interpreters
Multiple parts of a program are executed at the same time by these interpreters. This allows for improved parallelism and better utilization of multi-core processors.
Bytecode Interpreters
Source code is translated into an intermediate bytecode representation before execution using these interpreters.
Just-In-Time (JIT) Interpreters
JIT interpreters translate parts of the code into machine code dynamically. JIT interpreters have the features of interpreters and compilers.
Tree-Walk Interpreters
These interpreters use the source code to create an abstract syntax tree from the source code. The source tree is then traversed to execute the p
Compiler vs Interpreter in Programming
Compilers and Interpreters are software tools that help machines read and understand high-level programming languages.
PublishedFebruary 9, 2024
CategoryCompiler vs Interpreter
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