Ethereum: Script – OP_PUSHDATAs
understanding OP_PUSHDATES in Ethereum Scriptures
When working with Ethereum script language, one of the key features that allows efficient and compact coding is the use
OP_PUSHDATAS
. In this article, we will deepen how these coded and what represents are structured.
What is an ophdata op?
An OP_pushdata (opcodes for data) value is a type of opcode opcode that instructs the Ethereum (EVM) virtual machine to push the data on the stack. These values are used in different script functions, including Pusha,calll and DelegatedCall '.
How are OP Pushdatas coded?
OP PUSHDATES coding follows a specific structure:
- The first byte specific if the value is signed or unsigned.
- The next two bytes contain the data to be pushed on the stack.
Here's an example:
0x1 0x00 0x01
In this case,0x1indicates that the coded value is signed (ie a negative number), and 0x00 and0x01 represent the data to be pushed on the stack.
representing unsigned integers
When you use Pushdatas OP as unsigned integers, you can treat them as 32 -bit unpublished numbers. This allows effective storage and comparison of these values.
For example:
`
0x12345678
In this case,0x12345678 ‘represents a single whole value.
representing whole numbers signed
When using OP_pushdatas as signed integers, you must consider the possibility of flows and flows. To alleviate these risks, EVM uses a technique called
packing , where several data values are stored in a single byte or word.
For example:
`
0x12345678
| --- (signed integer)
In this case,0x12345678` represent both an unmoved and signed value.
Conclusion
OP_pushdatas provides a flexible and effective way to encode data values in Ethereum Scriptures. Understanding how these coded values are structured and what they represent, developers can write more efficient and legible code. Whether you work with signed or unsigned integers, the EVM packing technique assures you that your code is safe and reliable.