the base fee opcode (#141)

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

Cargo.toml

@@ -68,7 +68,7 @@ git2 = "0.19.0"
 # polkadot-sdk and friends
 codec = { version = "3.6.12", default-features = false, package = "parity-scale-codec" }
 scale-info = { version = "2.11.1", default-features = false }
-polkadot-sdk = { git = "https://github.com/paritytech/polkadot-sdk", rev = "ef8886570ea692133c6b49ecb2f1117c0a366ebd" }
+polkadot-sdk = { git = "https://github.com/paritytech/polkadot-sdk", rev = "2cbb4377d36af0aec9ae29dcabc5f5b1e88ed1db" }
 
 # llvm
 [workspace.dependencies.inkwell]

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

@@ -30,7 +30,15 @@ pub fn gas_price<'ctx, D>(
 where
     D: Dependency + Clone,
 {
-    Ok(context.word_const(1).as_basic_value_enum())
+    let gas_price_value = context
+        .build_runtime_call(revive_runtime_api::polkavm_imports::GAS_PRICE, &[])
+        .expect("the gas_price syscall method should return a value")
+        .into_int_value();
+
+    Ok(context
+        .builder()
+        .build_int_z_extend(gas_price_value, context.word_type(), "gas_price")?
+        .into())
 }
 
 /// Translates the `tx.origin` instruction.

crates/runtime-api/src/polkavm_imports.c

@@ -82,8 +82,6 @@ POLKAVM_IMPORT(uint64_t, call_data_load, uint32_t, uint32_t)
 
 POLKAVM_IMPORT(uint64_t, call_data_size)
 
-POLKAVM_IMPORT(uint64_t, delegate_call, uint32_t)
-
 POLKAVM_IMPORT(void, caller, uint32_t)
 
 POLKAVM_IMPORT(void, chain_id, uint32_t)
@@ -92,10 +90,14 @@ POLKAVM_IMPORT(uint64_t, code_size, uint32_t)
 
 POLKAVM_IMPORT(void, code_hash, uint32_t, uint32_t)
 
+POLKAVM_IMPORT(uint64_t, delegate_call, uint32_t)
+
 POLKAVM_IMPORT(void, deposit_event, uint32_t, uint32_t, uint32_t, uint32_t)
 
 POLKAVM_IMPORT(uint64_t, gas_limit);
 
+POLKAVM_IMPORT(uint64_t, gas_price);
+
 POLKAVM_IMPORT(void, get_immutable_data, uint32_t, uint32_t);
 
 POLKAVM_IMPORT(uint64_t, get_storage, uint32_t, uint32_t, uint32_t, uint32_t, uint32_t)

crates/runtime-api/src/polkavm_imports.rs

@@ -32,8 +32,6 @@ pub static CALL_DATA_LOAD: &str = "call_data_load";
 
 pub static CALL_DATA_SIZE: &str = "call_data_size";
 
-pub static DELEGATE_CALL: &str = "delegate_call";
-
 pub static CALLER: &str = "caller";
 
 pub static CHAIN_ID: &str = "chain_id";
@@ -42,10 +40,14 @@ pub static CODE_SIZE: &str = "code_size";
 
 pub static CODE_HASH: &str = "code_hash";
 
+pub static DELEGATE_CALL: &str = "delegate_call";
+
 pub static DEPOSIT_EVENT: &str = "deposit_event";
 
 pub static GAS_LIMIT: &str = "gas_limit";
 
+pub static GAS_PRICE: &str = "gas_price";
+
 pub static GET_IMMUTABLE_DATA: &str = "get_immutable_data";
 
 pub static GET_STORAGE: &str = "get_storage";
@@ -76,7 +78,7 @@ pub static WEIGHT_TO_FEE: &str = "weight_to_fee";
 
 /// All imported runtime API symbols.
 /// Useful for configuring common attributes and linkage.
-pub static IMPORTS: [&str; 32] = [
+pub static IMPORTS: [&str; 33] = [
     SBRK,
     MEMORY_SIZE,
     ADDRESS,
@@ -88,13 +90,14 @@ pub static IMPORTS: [&str; 32] = [
     CALL_DATA_COPY,
     CALL_DATA_LOAD,
     CALL_DATA_SIZE,
-    DELEGATE_CALL,
     CALLER,
     CHAIN_ID,
     CODE_SIZE,
     CODE_HASH,
+    DELEGATE_CALL,
     DEPOSIT_EVENT,
     GAS_LIMIT,
+    GAS_PRICE,
     GET_IMMUTABLE_DATA,
     GET_STORAGE,
     HASH_KECCAK_256,