commit 8ca996d94f0bfb7fe70f98b018e6a7dc77901099 Author: Yuriy Glukhov Date: Thu Jul 5 11:39:04 2018 +0300 Initial commit diff --git a/LICENSE-APACHEv2 b/LICENSE-APACHEv2 new file mode 100644 index 0000000..782d1bf --- /dev/null +++ b/LICENSE-APACHEv2 @@ -0,0 +1,201 @@ + Apache License + Version 2.0, January 2004 + http://www.apache.org/licenses/ + + TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION + + 1. Definitions. + + "License" shall mean the terms and conditions for use, reproduction, + and distribution as defined by Sections 1 through 9 of this document. + + "Licensor" shall mean the copyright owner or entity authorized by + the copyright owner that is granting the License. + + "Legal Entity" shall mean the union of the acting entity and all + other entities that control, are controlled by, or are under common + control with that entity. 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IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/README.md b/README.md new file mode 100644 index 0000000..c457bcf --- /dev/null +++ b/README.md @@ -0,0 +1,22 @@ +# Ethereum smart contracts in Nim + +Disclaimer: WIP + +This is a sample of how building eWASM contracts in Nim is possible. +Requirements: +* clang 6.0 or later with WebAssembly support. Most likely has to be built manually. +* `wasm2wat` and `wat2wasm` from [wabt (WebAssembly binary toolkit)](https://github.com/WebAssembly/wabt) +* [optional] [wasm-gc](https://github.com/alexcrichton/wasm-gc) optimizer + +## Compiling examples +``` +export WASM_LLVM_BIN=/path/to/llvm/bin/folder +nimble examples +``` + +## License + +Licensed under one of the following: + + * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or http://www.apache.org/licenses/LICENSE-2.0) + * MIT license: [LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT diff --git a/eth_contracts.nim b/eth_contracts.nim new file mode 100644 index 0000000..90e2b27 --- /dev/null +++ b/eth_contracts.nim @@ -0,0 +1,11 @@ +import macros + +{.pragma: importwasm, importc, cdecl.} + +proc getCallDataSize*(): uint32 {.importwasm.} + +macro exportwasm*(p: untyped): untyped = + expectKind(p, nnkProcDef) + result = p + result.addPragma(newIdentNode("exportc")) + result.addPragma(newColonExpr(newIdentNode("codegenDecl"), newLit("__attribute__ ((visibility (\"default\"))) $# $#$#"))) diff --git a/eth_contracts.nimble b/eth_contracts.nimble new file mode 100644 index 0000000..2ecd876 --- /dev/null +++ b/eth_contracts.nimble @@ -0,0 +1,16 @@ +version = "0.1.0" +author = "Status Research & Development GmbH" +description = "Ethereum smart contracts in Nim" +license = "Apache License 2.0" +skipDirs = @["examples"] + +# Dependencies + +requires "nim >= 0.18.1" + +proc buildExample(name: string) = + exec "nim c --out:examples/" & name & ".wasm examples/" & name + exec "./postprocess.sh examples/" & name & ".wasm" + +task examples, "Build examples": + buildExample("test") diff --git a/examples/panicoverride.nim b/examples/panicoverride.nim new file mode 100644 index 0000000..f6b46ca --- /dev/null +++ b/examples/panicoverride.nim @@ -0,0 +1,4 @@ +{.push stack_trace: off, profiler:off.} +proc rawoutput(s: string) = discard +proc panic(s: string) = rawoutput(s) +{.pop.} diff --git a/examples/test.nim b/examples/test.nim new file mode 100644 index 0000000..83aa025 --- /dev/null +++ b/examples/test.nim @@ -0,0 +1,4 @@ +import ../eth_contracts + +proc test(): int32 {.exportwasm.} = + let sz = getCallDataSize().int32 diff --git a/examples/test.nims b/examples/test.nims new file mode 100644 index 0000000..52bc564 --- /dev/null +++ b/examples/test.nims @@ -0,0 +1,20 @@ +--os:standalone +--cpu:i386 +--cc:clang +--gc:none +--d:release +--nomain +--opt:speed + +let llBin = getEnv("WASM_LLVM_BIN") +if llBin.len == 0: + raise newException(Exception, "WASM_LLVM_BIN env var is not set") + +let llTarget = "wasm32-unknown-unknown-wasm" + +switch("passC", "--target=" & llTarget) +switch("passL", "--target=" & llTarget) + +switch("clang.exe", llBin & "/clang") +switch("clang.linkerexe", llBin & "/clang") +switch("clang.options.linker", "-nostdlib -Wl,--no-entry,--allow-undefined,--strip-all") diff --git a/postprocess.sh b/postprocess.sh new file mode 100755 index 0000000..0e7db9e --- /dev/null +++ b/postprocess.sh @@ -0,0 +1,15 @@ + +WASM_FILE=$1 +set -ex + +if which wasm-gc > /dev/null +then + wasm-gc "$WASM_FILE" # Optimize +else + echo wasm-gc not found. The resulting wasm files will not be optimized +fi + +# Replace "env" with "ethereum" +wasm2wat "$WASM_FILE" | sed 's/(import "env" /(import "ethereum" /g' > /tmp/wasm.tmp +wat2wasm -o "$WASM_FILE" /tmp/wasm.tmp +rm /tmp/wasm.tmp