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Solving the “unresolved symbol” error in Solana’s program placement
As the developer is depressed to encounter errors during your project placement process. In this article, we will go into the details of the details you will experience and give action to solve it.
What does the error mean?
The error message indicates that your ELF (executable and tied) file has an unresolved symbol. The “Sol_alloc_free_function is a critical part of the Solana memory management system, but has no declared implementation in your program.
Understanding context
In the context of Solana programming,Sol_alloc_free _ ()is used to release the resources allocated to a certain memory pool. It is important to ensure that this feature is implemented and properly linked to your program.
The relevant code passage
Here is an example of how your code might look like:
Rust
// Solana.rs
Pub Fn Main () {
Allow mut aloc = std :: alloc :: alloc (1024, 0);
// …
}
`
In this case, STD :: Alloc is not the correct assignment function. Instead, you should use STD :: Mem and ‘Sol :: Alloc.
Solution
To solve the error, you must provide the introduction ofsol_alloc_free _ () for function. This can be done by adding a new feature to your code that corresponds to sol_alloc_free _ () signature. Here is an example:
`Rust
// Solana.rs (Updated)
Pub Fn Main () {
Allow mut aloc = std :: alloc :: alloc (1024, 0);
// …
}
Impl std :: Mem :: Alloc :: Memorypool {
Pub Fn Supply (& Mut Self) -> *CONST U8 {
// implement the assignment logic here …
Unclaimed! ();
}
PUB FN FREE (& Mut Self, PTR: *CONST U8) {
// implement Dallocation logic here …
Unclaimed! ();
}
}
Impl STD :: Alloc :: Alloc for Memorypool {
Fn Alloc (& Mut Self, Len: Usize) -> *Mut U8 {
// implement the assignment logic here …
Unclaimed! ();
}
Fn Darchloc (& mut Self, PTR: *Mut U8, Size: Usize) {
// implement Dallocation logic here …
Unclaimed! ();
}
}
`
Example of implementation
Here is an example of “Alloc” and free" features:
Rust
// Solana.rs (Updated)
Impl Memorypool {
Pub FN Gives (& Mut Self, Len: Usize) -> *Mut U8 {
Let PTR = insecure {STD :: MEM :: Align_OF :: () How USIZE};
STD :: PTR :: Write (PTR, [0u8; Len]);
blistering
}
PUB FN FREE (& Mut Self, PTR: *CONST U8, Size: Usize) {
Let Len = Size / 2;
insecure {STD :: MEM :: Miymaina (PTR, [0u8; Len]); }
}
}
Impic all for memorypool {}
Impl STD :: Alloc :: Memorypool for Memorypool {
Fn Alloc (& Mut Self, Len: Usize) -> *Mut U8 {
Self. Allocation (LEN)
}
Fn Darchloc (& mut Self, PTR: *Mut U8, Size: Usize) {
Self.free (PTR, Size);
}
}
`
Conclusion
In order to solve the “non -resolution of the symbol” error in the placement of the Solana program, you must provide the implementation of the sol_alloc_free _ (). In this example, we have created a simple “memory coil” structure that provides “Alloc” and “free” with the correct signature.
When doing these steps, you should be able to solve the error and successfully place your program.
