add compiler helpers to solidity test utils

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

crates/solidity/src/test_utils.rs

@@ -1,8 +1,12 @@
 //! Common utility used for in frontend and integration tests.
 use std::collections::BTreeMap;
 use std::collections::BTreeSet;
+use std::collections::HashMap;
 use std::path::PathBuf;
 use std::str::FromStr;
+use std::sync::Mutex;
+
+use once_cell::sync::Lazy;
 
 use crate::project::Project;
 use crate::solc::pipeline::Pipeline as SolcPipeline;
@@ -14,6 +18,16 @@ use crate::solc::standard_json::output::Output as SolcStandardJsonOutput;
 use crate::solc::Compiler as SolcCompiler;
 use crate::warning::Warning;
 
+static PVM_BLOB_CACHE: Lazy<Mutex<HashMap<CachedBlob, Vec<u8>>>> = Lazy::new(Default::default);
+static EVM_BLOB_CACHE: Lazy<Mutex<HashMap<CachedBlob, Vec<u8>>>> = Lazy::new(Default::default);
+
+#[derive(Hash, PartialEq, Eq)]
+struct CachedBlob {
+    contract_name: String,
+    solc_optimizer_enabled: bool,
+    pipeline: SolcPipeline,
+}
+
 /// Checks if the required executables are present in `${PATH}`.
 fn check_dependencies() {
     for executable in [
@@ -260,3 +274,91 @@ pub fn check_solidity_warning(
 
     Ok(contains_warning)
 }
+
+/// Compile the blob of `contract_name` found in given `source_code`.
+/// The `solc` optimizer will be enabled
+pub fn compile_blob(contract_name: &str, source_code: &str) -> Vec<u8> {
+    compile_blob_with_options(contract_name, source_code, true, SolcPipeline::Yul)
+}
+
+/// Compile the EVM bin-runtime of `contract_name` found in given `source_code`.
+/// The `solc` optimizer will be enabled
+pub fn compile_evm_bin_runtime(contract_name: &str, source_code: &str) -> Vec<u8> {
+    let pipeline = SolcPipeline::Yul;
+    let solc_optimizer_enabled = true;
+    let id = CachedBlob {
+        contract_name: contract_name.to_owned(),
+        pipeline,
+        solc_optimizer_enabled,
+    };
+
+    if let Some(blob) = EVM_BLOB_CACHE.lock().unwrap().get(&id) {
+        return blob.clone();
+    }
+
+    let file_name = "contract.sol";
+    let contracts = build_solidity_with_options_evm(
+        [(file_name.into(), source_code.into())].into(),
+        Default::default(),
+        None,
+        pipeline,
+        solc_optimizer_enabled,
+    )
+    .expect("source should compile");
+    let bin_runtime = &contracts
+        .get(contract_name)
+        .unwrap_or_else(|| panic!("contract '{}' didn't produce bin-runtime", contract_name))
+        .object;
+
+    let blob = hex::decode(bin_runtime).expect("bin-runtime shold be hex encoded");
+
+    EVM_BLOB_CACHE.lock().unwrap().insert(id, blob.clone());
+
+    blob
+}
+
+/// Compile the blob of `contract_name` found in given `source_code`.
+pub fn compile_blob_with_options(
+    contract_name: &str,
+    source_code: &str,
+    solc_optimizer_enabled: bool,
+    pipeline: SolcPipeline,
+) -> Vec<u8> {
+    let id = CachedBlob {
+        contract_name: contract_name.to_owned(),
+        solc_optimizer_enabled,
+        pipeline,
+    };
+
+    if let Some(blob) = PVM_BLOB_CACHE.lock().unwrap().get(&id) {
+        return blob.clone();
+    }
+
+    let file_name = "contract.sol";
+    let contracts = build_solidity_with_options(
+        [(file_name.into(), source_code.into())].into(),
+        Default::default(),
+        None,
+        pipeline,
+        revive_llvm_context::OptimizerSettings::cycles(),
+        solc_optimizer_enabled,
+    )
+    .expect("source should compile")
+    .contracts
+    .expect("source should contain at least one contract");
+
+    let bytecode = contracts[file_name][contract_name]
+        .evm
+        .as_ref()
+        .expect("source should produce EVM output")
+        .bytecode
+        .as_ref()
+        .expect("source should produce assembly text")
+        .object
+        .as_str();
+    let blob = hex::decode(bytecode).expect("hex encoding should always be valid");
+
+    PVM_BLOB_CACHE.lock().unwrap().insert(id, blob.clone());
+
+    blob
+}