# L1X VM Cross-Contract Calls

eBPF runtime allows a smart-contract to call another smart-contract's function. The smart-contract is halted until the called smart-contract finishes execution.

When Smart-Contract A calls Smart-Contract B, the  is Smart-Contract B is executed in the following context:

1. The `caller_address()` API function will return the Smart-Contract A **contract instance address**  
2. `transfer_from_caller()` API function will transfer tokens from Smart-Contract A balance to Smart-Contract B balance
3. `contract_instance_address` API function will return Smart-Contract B contract instance address
4. `contract_owner_address` API function will return Smart-Contract B contract owner address
5. If Smart-Contract A has been called in *read-only* context then Smart-Contract B will be called in the same context. It means Smart-Contract B will not be able to modify its own persistent storage.

**Diagram**

<figure><img src="https://879140870-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FeTLmER6Ab8VaxeOI6Vla%2Fuploads%2FSXPukql9TlvrvrbbY8Kv%2FGitbook%20Cross-Contract%20calls%20-%20L1XVM%20-%26gt%3B%20L1XVM.jpg?alt=media&#x26;token=5c46cabf-184e-487c-850b-eab036fff64d" alt=""><figcaption></figcaption></figure>

<figure><img src="https://879140870-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FeTLmER6Ab8VaxeOI6Vla%2Fuploads%2FrWA11xWPk7bxnLnRozgn%2FGitbook%20Cross-Contract%20calls%20-%20L1XVM%20-%26gt%3B%20L1XEVM.jpg?alt=media&#x26;token=9b6491f6-26e9-406c-b755-ae1cb8e9212c" alt=""><figcaption></figcaption></figure>


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