This is an abstraction layer around the wasmer VM to expose just what we need to run cosmwasm contracts in a high-level manner. This is intended both for efficient writing of unit tests, as well as a public API to run contracts in eg. go-cosmwasm. As such it includes all glue code needed for typical actions, like fs caching.
A VM can support one or more contract-VM interface versions. The interface version is communicated by the contract via a Wasm import. This is the current compatibility list:
| cosmwasm-vm | Supported interface versions | cosmwasm-std |
| ----------- | ---------------------------- | ------------ |
| 0.14 | interface_version_5 | 0.14 |
| 0.13 | cosmwasm_vm_version_4 | 0.11-0.13 |
| 0.12 | cosmwasm_vm_version_4 | 0.11-0.13 |
| 0.11 | cosmwasm_vm_version_4 | 0.11-0.13 |
| 0.10 | cosmwasm_vm_version_3 | 0.10 |
| 0.9 | cosmwasm_vm_version_2 | 0.9 |
| 0.8 | cosmwasm_vm_version_1 | 0.8 |
There are demo files in testdata/*.wasm. Those are compiled and optimized
versions of
contracts/hackatom
and
contracts/staking
run through rust-optimizer.
To rebuild the test contracts, go to the repo root and do
```sh docker run --rm -v "$(pwd)":/code \ --mount type=volume,source="devcontractcachehackatom",target=/code/contracts/hackatom/target \ --mount type=volume,source=registrycache,target=/usr/local/cargo/registry \ cosmwasm/rust-optimizer:0.10.7 ./contracts/hackatom \ && cp artifacts/hackatom.wasm packages/vm/testdata/hackatom0.14.wasm
docker run --rm -v "$(pwd)":/code \ --mount type=volume,source="devcontractcacheibcreflect",target=/code/contracts/ibc-reflect/target \ --mount type=volume,source=registrycache,target=/usr/local/cargo/registry \ cosmwasm/rust-optimizer:0.10.7 ./contracts/ibc-reflect \ && cp artifacts/ibcreflect.wasm packages/vm/testdata/ibcreflect_0.14.wasm ```
By default, this repository is built and tested with the singlepass backend. You
can enable the cranelift feature to override the default backend with
Cranelift
sh
cd packages/vm
cargo test --features iterator
cargo test --features cranelift,iterator
Using Singlepass:
cd packages/vm
cargo bench --no-default-features
Using Cranelift:
cd packages/vm
cargo bench --no-default-features --features cranelift
module_size and module_size.sh
Memory profiling of compiled modules. module_size.sh executes module_size,
and uses valgrind's memory profiling tool (massif) to compute the amount of heap
memory used by a compiled module.
cd packages/vm
RUSTFLAGS="-g" cargo build --release --example module_size
./examples/module_size.sh ./testdata/hackatom.wasm
This package is part of the cosmwasm repository, licensed under the Apache License 2.0 (see NOTICE and LICENSE).