mirror of
https://github.com/pezkuwichain/revive.git
synced 2026-04-22 21:58:01 +00:00
Cyrill Leutwiler
cec283986f
We only need LLD for cross compilation. This significantly reduces the LLVM build times in a cross compilation scenario. Update the README as a drive-by.
86 lines
4.0 KiB
Markdown
86 lines
4.0 KiB
Markdown
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[](https://contracts.polkadot.io)
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# revive
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YUL and EVM assembly recompiler to LLVM, targetting RISC-V on [PolkaVM](https://github.com/koute/polkavm).
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Visit [contracts.polkadot.io](https://contracts.polkadot.io) to learn more about contracts on Polkadot!
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## Status
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This is experimental software in active development and not ready just yet for production usage. Please do report any compiler related issues or missing features that are [not yet known to us](https://contracts.polkadot.io/known_issues/) here.
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Discussion around the development is hosted on the [Polkadot Forum](https://forum.polkadot.network/t/contracts-update-solidity-on-polkavm/6949#a-new-solidity-compiler-1).
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## Installation
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`resolc` depends on the [solc](https://github.com/ethereum/solidity) binary installed on your system.
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Download and install the `resolc` frontend executable for your platform from our [releases](https://github.com/paritytech/revive/releases).
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## Building from source
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Building revive requires a [stable Rust installation](https://rustup.rs/) and a C++ toolchain for building [LLVM](https://github.com/llvm/llvm-project) on your system.
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### LLVM
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`revive` depends on a custom build of LLVM `v18.1.8` with the RISC-V _embedded_ target, including the `compiler-rt` builtins. Use the provided [revive-llvm](crates/llvm-builder/README.md) utility to compile a compatible LLVM build locally and point `$LLVM_SYS_181_PREFIX` to the installation afterwards.
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The `Makefile` provides a shortcut target to obtain a compatible LLVM build:
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```bash
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make install-llvm
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export LLVM_SYS_181_PREFIX=${PWD}/target-llvm/gnu/target-final
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```
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### The `resolc` Solidity frontend
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To build the `resolc` Solidity frontend executable, make sure you have obtained a compatible LLVM build using [revive-llvm](crates/llvm-builder/README.md) and did export the `LLVM_SYS_181_PREFIX` environment variable pointing to it (see [above](#LLVM)).
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To install the `resolc` Solidity frontend executable:
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```bash
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make install-bin
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resolc --version
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```
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### Cross-compilation to Wasm
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Cross-compile the `resolc.js` frontend executable to Wasm for running it in a Node.js or browser environment. The `REVIVE_LLVM_TARGET_PREFIX` environment variable is used to control the target environment LLVM dependency.
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```bash
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# Build the host LLVM dependency with PolkaVM target support
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make install-llvm
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export LLVM_SYS_181_PREFIX=${PWD}/target-llvm/gnu/target-final
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# Build the target LLVM dependency with PolkaVM target support
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revive-llvm --target-env emscripten clone
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source emsdk/emsdk_env.sh
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revive-llvm --target-env emscripten build --llvm-projects lld
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export REVIVE_LLVM_TARGET_PREFIX=${PWD}/target-llvm/emscripten/target-final
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# Build the resolc frontend executable
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make install-wasm
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make test-wasm
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```
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### Development
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Please consult the [Makefile](Makefile) targets to learn how to run tests and benchmarks.
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Ensure that your branch passes `make test` locally when submitting a pull request.
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## Design overview
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`revive` uses [solc](https://github.com/ethereum/solidity/), the Ethereum Solidity compiler, as the [Solidity frontend](crates/solidity/src/lib.rs) to process smart contracts written in Solidity. The YUL IR code (or legacy EVM assembly as a fallback for older `solc` versions) emitted by `solc` is then translated to LLVM IR, targetting [Polkadots `revive` pallet](https://docs.rs/pallet-revive/latest/pallet_revive/trait.SyscallDoc.html).
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[Frontend](https://github.com/matter-labs/era-compiler-solidity) and [code generator](https://github.com/matter-labs/era-compiler-llvm-context) are based of ZKSync `zksolc`.
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## Tests
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Before running the tests, ensure that Geth (Go Ethereum) is installed on your system. Follow the installation guide here: [Installing Geth](https://geth.ethereum.org/docs/getting-started/installing-geth).
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Once Geth is installed, you can run the tests using the following command:
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```bash
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make test
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```
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