Add EIP1962 precompile

Cargo.toml

@@ -8,6 +8,7 @@ members = [
     "ecpairing",
     "ecrecover",
     "ed25519",
+    "eip1962",
     "identity",
     "keccak256",
     "modexp",

chisel.yml

@@ -89,6 +89,19 @@ ed25519:
   repack:
     preset: "ewasm"
 
+eip1962:
+  file: "target/wasm32-unknown-unknown/release/ewasm_precompile_eip1962.wasm"
+  remapimports:
+    preset: "ewasm"
+  trimexports:
+    preset: "ewasm"
+  verifyimports:
+    preset: "ewasm"
+  verifyexports:
+    preset: "ewasm"
+  repack:
+    preset: "ewasm"
+
 identity:
   file: "target/wasm32-unknown-unknown/release/ewasm_precompile_identity.wasm"
   remapimports:

eip1962/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "ewasm-precompile-eip1962"
+version = "0.2.0"
+authors = ["Alex Beregszaszi <[email protected]>"]
+license = "Apache-2.0"
+repository = "https://github.com/ewasm/ewasm-precompiles"
+description = "Ethereum EIP1962 precompile in Rust"
+publish = false
+edition = "2018"
+
+[dependencies]
+ewasm_api = "0.9"
+# 0.2.0
+eth_pairings = { git = "https://github.com/matter-labs/eip1962", rev = "6a06b44cd8d5dd9265480312a08b4a7c69fbbbe0" }
+
+[lib]
+crate-type = ["cdylib"]

eip1962/src/lib.rs

@@ -0,0 +1,25 @@
+extern crate ewasm_api;
+
+#[cfg(not(test))]
+#[no_mangle]
+pub extern "C" fn main() {
+    let input = ewasm_api::calldata_acquire();
+
+    let gas_cost = eth_pairings::gas_meter::GasMeter::meter(&input);
+    let gas_cost = if gas_cost.is_err() {
+        ewasm_api::abort();
+    } else {
+        gas_cost.unwrap()
+    };
+
+    ewasm_api::consume_gas(gas_cost);
+
+    let result = eth_pairings::public_interface::API::run(&input);
+    let result = if result.is_err() {
+        ewasm_api::abort();
+    } else {
+        result.unwrap()
+    };
+
+    ewasm_api::finish_data(&result);
+}