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ckb-std

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

Usage

Documentation

Modules

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
dummy_atomic module: dummy atomic operations
logger module: colored logger implementation
type_id module: Type ID implementation (feature type-id)

Memory allocator

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.

Examples

Check examples and tests to learn how to use.

See also ckb-tool which helps you write tests.

Upgrading Issues

Starting from ckb-std 0.16.0, RISC-V atomic instructions are generated by default. However, ckb-vm doesn't directly support atomic instructions. To address this, ckb-std provides the following solutions:

Use the "dummy-atomic" feature (enabled by default)
Adjust Rust compilation flags by adding -C target-feature=-a to RUSTFLAGS