The c_ewasm_contracts from s1na

c_ewasm_contracts's Introduction

This repository has some Ewasm contracts written in C.

Get dependencies.

# hopefully you have llvm 8+, check:
clang --version
# if not
make llvm-install	# should do this manually since it may need a restart. Copy the Makefile recipe or see LLVM getting started website.
# Note: LLVM version 8+ support Wasm by default. Earlier versions must be compiled with experimental wasm flag, and have different linker. We use the linker from LLVM 8+.

# install everything else
make install
# or install things individually
make wabt-install
make binaryen-install
make pywebassembly-install

# you can also install things anywhere in your system, and update paths in the Makefile or as arguments

Compile stuff.

# compile contracts in src/
make all

# compile individual project with a recipe in the Makefile
make blake2b_ref

# compile arbitrary my_contract.c
make PROJECT=my_contract SRC_DIR=path/to/my_contract/src/dir

# compile with custom tool directories
make WABT_DIR=path/to/wabt/build/ LLVM_DIR=path/to/llvm/binaries PROJECT=mul256

# clean up
make clean

WARNING: Ewasm is not yet finalized. This toolchain is changing. There are experiments in the src directory.

NOTE ABOUT C++: Basic things like std::vector require memory managment, which most standard C++ libraries implement as system calls. Ewasm doesn't support system calls, so memory management must be done in Wasm. So far, a custom malloc() is in ewasm.h, but other things are still needed before we can try to compile against C++ standard library without requiring system calls.

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