Compiler Intrinsics
The Sway compiler supports a list of intrinsics that perform various low level operations that are useful for building libraries. Compiler intrinsics should rarely be used but are preferred over asm blocks because they are type-checked and are safer overall. Below is a list of all available compiler intrinsics:
__size_of_val<T>(val: T) -> u64
Description: Return the size of type T in bytes.
Constraints: None.
__size_of<T>() -> u64
Description: Return the size of type T in bytes.
Constraints: None.
__is_reference_type<T>() -> bool
Description: Returns true if T is a reference type and false otherwise.
Constraints: None.
__eq<T>(lhs: T, rhs: T) -> bool
Description: Returns whether lhs and rhs are equal.
Constraints: T is bool, u8, u16, u32, u64, or raw_ptr.
__gtf<T>(index: u64, tx_field_id: u64) -> T
Description: Returns transaction field with ID tx_field_id at index index, if applicable. This is a wrapper around FuelVM's gtf instruction. The resuting field is cast to T.
Constraints: None.
__addr_of<T>(val: T) -> raw_ptr
Description: Returns the address in memory where val is stored.
Constraints: T is a reference type.
__state_load_word(key: b256) -> u64
Description: Reads and returns a single word from storage at key key.
Constraints: None.
__state_load_quad(key: b256, ptr: raw_ptr, slots: u64)
Description: Reads slots number of slots (b256 each) from storage starting at key key and stores them in memory starting at address ptr
Constraints: None.
__state_store_word(key: b256, val: u64)
Description: Stores a single word val into storage at key key.
Constraints: None.
__state_store_quad(key: b256, ptr: raw_ptr, slots: u64)
Description: Stores slots number of slots (b256 each) starting at address ptr in memory into storage starting at key key.
Constraints: None.
__log<T>(val: T)
Description: Logs value val.
Constraints: None.
__add<T>(lhs: T, rhs: T) -> T
Description: Adds lhs and rhs and returns the result.
Constraints: T is an integer type, i.e. u8, u16, u32, u64.
__sub<T>(lhs: T, rhs: T) -> T
Description: Subtracts rhs from lhs.
Constraints: T is an integer type, i.e. u8, u16, u32, u64.
__mul<T>(lhs: T, rhs: T) -> T
Description: Multiplies lhs by rhs.
Constraints: T is an integer type, i.e. u8, u16, u32, u64.
__div<T>(lhs: T, rhs: T) -> T
Description: Divides lhs by rhs.
Constraints: T is an integer type, i.e. u8, u16, u32, u64.
__revert(code: u64)
Description: Reverts with error code code.
Constraints: None.
__ptr_add(ptr: raw_ptr, offset: u64)
Description: Adds offset to the raw value of pointer ptr.
Constraints: None.
__ptr_sub(ptr: raw_ptr, offset: u64)
Description: Subtracts offset to the raw value of pointer ptr.
Constraints: None.
__smo<T>(recipient: b256, data: T, output_index: u64, coins: u64)
Description: Sends a message data of arbitrary type T and coins amount of the base asset to address recipient. This intrinsic assumes that an OutputMessage is available at index output_index.
Constraints: None.