implement EXTCODESIZE

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

crates/llvm-context/src/polkavm/const/runtime_api.rs

@@ -16,6 +16,8 @@ pub static BLOCK_NUMBER: &str = "block_number";
 
 pub static CALLER: &str = "caller";
 
+pub static CODE_SIZE: &str = "code_size";
+
 pub static DEPOSIT_EVENT: &str = "deposit_event";
 
 pub static GET_STORAGE: &str = "get_storage";
@@ -36,7 +38,7 @@ pub static VALUE_TRANSFERRED: &str = "value_transferred";
 
 /// All imported runtime API symbols..
 /// Useful for configuring common attributes and linkage.
-pub static IMPORTS: [&str; 11] = [
+pub static IMPORTS: [&str; 12] = [
     ADDRESS,
     BLOCK_NUMBER,
     CALLER,
@@ -44,6 +46,7 @@ pub static IMPORTS: [&str; 11] = [
     GET_STORAGE,
     HASH_KECCAK_256,
     INPUT,
+    INSTANTIATE,
     NOW,
     RETURN,
     SET_STORAGE,

crates/llvm-context/src/polkavm/evm/ext_code.rs

@@ -1,17 +1,36 @@
 //! Translates the external code operations.
 
+use inkwell::values::BasicValue;
+
 use crate::polkavm::context::Context;
 use crate::polkavm::Dependency;
+use crate::polkavm_const::runtime_api;
 
 /// Translates the `extcodesize` instruction.
 pub fn size<'ctx, D>(
-    _context: &mut Context<'ctx, D>,
-    _address: inkwell::values::IntValue<'ctx>,
+    context: &mut Context<'ctx, D>,
+    address: inkwell::values::IntValue<'ctx>,
 ) -> anyhow::Result<inkwell::values::BasicValueEnum<'ctx>>
 where
     D: Dependency + Clone,
 {
-    todo!()
+    let address_pointer = context.build_alloca(context.word_type(), "value");
+    context.build_store(address_pointer, address)?;
+
+    let address_pointer_casted = context.builder().build_ptr_to_int(
+        address_pointer.value,
+        context.xlen_type(),
+        "address_pointer",
+    )?;
+    let value = context
+        .build_runtime_call(runtime_api::CODE_SIZE, &[address_pointer_casted.into()])
+        .unwrap_or_else(|| panic!("{} should return a value", runtime_api::CODE_SIZE))
+        .into_int_value();
+
+    Ok(context
+        .builder()
+        .build_int_z_extend(value, context.word_type(), "extcodesize")?
+        .as_basic_value_enum())
 }
 
 /// Translates the `extcodehash` instruction.