opcode

简明释义

英[ˈɒpkəʊd]美[ˈɑːpkoʊd]

n. 操作码；作业码

英英释义

单词用法

同义词

反义词

例句

1.Without a doubt, an opcode cache is the first step in speeding up PHP by removing the need to parse and compile a script on every request.

毫无疑问，一个操作码缓存是通过在每次请求后消除解析和编译脚本的需要来加速PHP 的第一步。

2.Alternative PHP cache (APC) is probably the most popular opcode cache for PHP (see Resources).

替代php缓存(APC)可能是PHP最流行的操作码缓存(参见参考资料)。

3.It failed because the compreg opcode assumes a hash to initialized.

因为胶压木操作码假定要初始化的哈希值，所以它失败了。

4.MonoBook.deps.php - a fix for a bug in the APC opcode cache of PHP v5.

php—对phpV5的APC op code缓存内的bug的修复。

5.Alternative PHP cache, is probably the most popular opcode cache for PHP.

替代PHP缓存大概是PHP最流行的操作码缓存。

6.The makers of Zend also have a commercial opcode cache that includes an optimizer to further increase efficiency.

Zend的厂商也提供了一种商业操作码缓存，包括一个进一步提高效率的优化器。

7.When a PHP script is requested, PHP reads the script and compiles it into what's called Zend opcode, a binary representation of the code to be executed.

请求一个php脚本时，php会读取该脚本，并将其编译为Zend操作码，这是要执行的代码的一种二进制表示形式。

8.To enable the opcode optimizer, add — enable-xcache-optimizer.

要启用操作码优化，添加——enable - xcache - optimizer。

9.The CPU interprets each opcode as a specific instruction to execute.

CPU将每个操作码解释为要执行的特定指令。

10.In assembly language, an opcode defines the operation to be performed.

在汇编语言中，操作码定义了要执行的操作。

11.Debugging often requires understanding the opcode generated by the compiler.

调试通常需要理解编译器生成的操作码。

12.Each opcode is represented by a unique binary code.

每个操作码由唯一的二进制代码表示。

13.Programmers can optimize performance by using efficient opcodes.

程序员可以通过使用高效的操作码来优化性能。

作文

In the world of computing and programming, understanding the fundamental components that make up a machine's instruction set is crucial for any aspiring developer or computer scientist. One such component is the opcode, which stands for 'operation code'. The term opcode refers to the part of a machine language instruction that specifies the operation to be performed. Essentially, it tells the computer what action it needs to execute, whether it's adding two numbers, storing data in memory, or jumping to a different part of the program. Without opcodes, computers would not be able to understand the instructions given by programmers, as these codes serve as the bridge between human-readable code and machine-executable actions. When we write programs in high-level languages like Python or Java, these languages are eventually translated into machine code, which consists of opcodes and operands. The opcode defines the operation, while the operands represent the data involved in that operation. For instance, in an assembly language instruction like 'ADD R1, R2', 'ADD' is the opcode indicating that the values in registers R1 and R2 should be added together. This simple example highlights the importance of opcodes in the realm of programming and how they form the backbone of machine instructions. Different processors have different sets of opcodes, which means that the same high-level programming language can produce different machine codes depending on the architecture of the underlying hardware. This is why understanding opcodes is essential for low-level programming and systems design. It allows developers to optimize their code for specific hardware and improve performance by leveraging the unique features of a particular processor. Moreover, opcodes play a vital role in debugging and reverse engineering software. When analyzing compiled binaries, security researchers often look at the opcodes to understand how a program operates. By examining the sequence of opcodes, they can identify vulnerabilities or malicious behavior within the software. Thus, knowledge of opcodes is not only beneficial for creating software but also for ensuring its security and integrity. In conclusion, the concept of opcode is integral to the field of computer science and programming. It serves as the foundation for how instructions are executed on a machine level. Understanding opcodes enhances a programmer's ability to write efficient code, debug applications, and optimize performance for various hardware architectures. As technology continues to advance, the significance of opcodes will only grow, making it a vital topic for anyone interested in the inner workings of computers and programming languages. Therefore, mastering the concept of opcode is essential for anyone looking to excel in the tech industry.

在计算机和编程的世界中，理解构成机器指令集的基本组成部分对于任何有抱负的开发者或计算机科学家来说都是至关重要的。其中一个组成部分是opcode，即“操作码”的缩写。术语opcode指的是机器语言指令中的一部分，它指定要执行的操作。基本上，它告诉计算机需要执行什么操作，无论是将两个数字相加、将数据存储到内存中，还是跳转到程序的不同部分。没有opcode，计算机将无法理解程序员给出的指令，因为这些代码充当了人类可读代码与机器可执行操作之间的桥梁。 当我们用像Python或Java这样的高级语言编写程序时，这些语言最终会被翻译成机器代码，机器代码由opcode和操作数组成。opcode定义操作，而操作数表示涉及该操作的数据。例如，在汇编语言指令'ADD R1, R2'中，'ADD'是opcode，表示应该将寄存器R1和R2中的值相加。这个简单的例子突显了opcode在编程领域的重要性，以及它们如何构成机器指令的基础。 不同的处理器有不同的opcode集，这意味着同样的高级编程语言可以根据底层硬件的架构生成不同的机器代码。这就是为什么理解opcode对于低级编程和系统设计至关重要。它使开发人员能够针对特定硬件优化他们的代码，并通过利用特定处理器的独特功能来提高性能。 此外，opcode在调试和逆向工程软件中也发挥着重要作用。当分析已编译的二进制文件时，安全研究人员通常查看opcode以了解程序的操作方式。通过检查opcode的序列，他们可以识别软件中的漏洞或恶意行为。因此，掌握opcode不仅对创建软件有益，而且对确保其安全性和完整性也至关重要。 总之，opcode的概念是计算机科学和编程领域不可或缺的一部分。它作为机器级指令执行的基础。理解opcode增强了程序员编写高效代码、调试应用程序以及为各种硬件架构优化性能的能力。随着技术的不断进步，opcode的重要性只会增加，使其成为任何对计算机和编程语言内部工作原理感兴趣的人必须掌握的主题。因此，掌握opcode的概念对于希望在科技行业中脱颖而出的人来说至关重要。