switch to pallet_revive runtime (#40)

Signed-off-by: xermicus <cyrill@parity.io>

crates/runtime-api/src/polkavm_imports.rs

@@ -0,0 +1,34 @@
+//! This crate vendors the [PolkaVM][0] C API and provides a LLVM module for interacting
+//! with the `pallet-revive` runtime API.
+//! At present, the revive pallet requires blobs to export `call` and `deploy`,
+//! and offers a bunch of [runtime API methods][1]. The provided [module] implements
+//! those exports and imports.
+//! [0]: [https://crates.io/crates/polkavm]
+//! [1]: [https://docs.rs/pallet-contracts/26.0.0/pallet_contracts/api_doc/index.html]
+
+use inkwell::{context::Context, memory_buffer::MemoryBuffer, module::Module, support::LLVMString};
+
+include!(concat!(env!("OUT_DIR"), "/polkavm_imports.rs"));
+
+/// Creates a LLVM module from the [BITCODE].
+/// The module imports `pallet-revive` runtime API functions.
+/// Returns `Error` if the bitcode fails to parse, which should never happen.
+pub fn module<'context>(
+    context: &'context Context,
+    module_name: &str,
+) -> Result<Module<'context>, LLVMString> {
+    let buf = MemoryBuffer::create_from_memory_range(BITCODE, module_name);
+    Module::parse_bitcode_from_buffer(&buf, context)
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::polkavm_imports;
+
+    #[test]
+    fn it_works() {
+        inkwell::targets::Target::initialize_riscv(&Default::default());
+        let context = inkwell::context::Context::create();
+        let _ = polkavm_imports::module(&context, "polkavm_imports").unwrap();
+    }
+}