Understanding of Op_pushdataas in the Ethereum scripts
When working with Ethereum scripts, one of the main features that allows an effective and compact coding is the use of
op_pushdatas . In this article, we will deepen the way these codified values are structured and what they are.
What is op Pushdata?
The OPUSHDATA VALUE (OPCODE FOR PUSH DATA) is a type of operating code indicating the Ethereum virtual machine (EVM) to press the data in the stack. These values are used in various characteristics of the scripts, including “push”, Call e delegatedcall.
How are PushdataS OP coded?
Pushdataas op coding follows a specific structure:
- The first byte indicates whether the value is signed or not signed.
- The following two bytes contain the data that must be driven on the stack.
Here is an example:
0x1 0x00 0x01
In this case,0x1indicates that the codified value is signed (i.e. negative number), a '0x00 is 0x01represent the data that must be pressed on the stack.
Presentation of unwanted whole numbers
When you use PushdataS OP as unlikely integral numbers, you can treat them as 32 -bit -free -unparalleled numbers. This allows an effective memory and a comparison of these values.
For example:
0x12345678
In this case,0x12345678is a single unscathed whole value.
Presentation of signed integers
When using Op_pushdatas as signed inner numbers, it is necessary to take into account the possibility of overflowing and underestimating. To mitigate these risks, EVM uses a technique called
Package
, in which more data values are stored in a Byte or word.
For example:
`
0x12345678
| --- (full signed)
In this case,` 0x12345678 ’it is both unscathed and signed.
Conclusion
Op_pushdatas provides a flexible and effective way to codify data values in Ethereum scripts. By understanding how these coded values are structured and what they are, developers can write a more efficient and legible code. Whether you are working with signed or unsigned integers, the EVM packaging technique guarantees that your code is safe and reliable.