This library contains several modules that help you write CKB contract with Rust.

Documentation

• syscalls module: defines CKB syscalls
• high_level module: defines high level APIs
• dynamic_loading module: dynamic loading primitives
• debug! macro: a println! like macro helps debugging
• entry! macro: defines contract entry point
• default_alloc! macro: defines global allocator for no-std rust

Default allocator uses a mixed allocation strategy:

• Fixed block heap, only allocate fixed size(64B) memory block
• Dynamic memory heap, allocate any size memory block

User can invoke macro with arguments to customize the heap size. The default heap size arguments are:

(fixed heap size 4KB, dynamic heap size 516KB, dynamic heap min memory block 64B)

Use the macro with arguments to change it:

default_alloc!(4 * 1024, 516 * 1024, 64)

Beware, use difference heap size or memory block size may affect the verification result of the contract, some runtime errors such as out of memory may occur; you should always test the contract after customizing.

Check examples and tests to learn how to use.

See also ckb-tool which helps you write tests.