Updated call semantics (#56)

- Update pallet-revive dependency
- Implement calls according to pallet-revive call semantics
- Switch to the new return data API in pallet revive and get rid of return data buffer
- Remove a bunch of resulting dead code

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

@@ -21,12 +21,6 @@ pub static GLOBAL_CALLDATA_POINTER: &str = "ptr_calldata";
 /// The calldata size global variable name.
 pub static GLOBAL_CALLDATA_SIZE: &str = "calldatasize";
 
-/// The return data pointer global variable name.
-pub static GLOBAL_RETURN_DATA_POINTER: &str = "ptr_return_data";
-
-/// The return data size pointer global variable name.
-pub static GLOBAL_RETURN_DATA_SIZE: &str = "returndatasize";
-
 /// The call flags global variable name.
 pub static GLOBAL_CALL_FLAGS: &str = "call_flags";
 
@@ -36,15 +30,6 @@ pub static GLOBAL_CONST_ARRAY_PREFIX: &str = "const_array_";
 /// The global verbatim getter identifier prefix.
 pub static GLOBAL_VERBATIM_GETTER_PREFIX: &str = "get_global::";
 
-/// The static word size.
-pub static GLOBAL_I256_SIZE: &str = "i256_size";
-
-/// The static value size.
-pub static GLOBAL_I160_SIZE: &str = "i160_size";
-
-/// The static i64 size.
-pub static GLOBAL_I64_SIZE: &str = "i64_size";
-
 /// The external call data offset in the auxiliary heap.
 pub const HEAP_AUX_OFFSET_EXTERNAL_CALL: u64 = 0;
 

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

@@ -41,7 +41,9 @@ pub mod imports {
 
     pub static RETURN: &str = "seal_return";
 
-    pub static RETURNDATACOPY: &str = "returndatacopy";
+    pub static RETURNDATACOPY: &str = "return_data_copy";
+
+    pub static RETURNDATASIZE: &str = "return_data_size";
 
     pub static SET_STORAGE: &str = "set_storage";
 
@@ -49,7 +51,7 @@ pub mod imports {
 
     /// All imported runtime API symbols.
     /// Useful for configuring common attributes and linkage.
-    pub static IMPORTS: [&str; 17] = [
+    pub static IMPORTS: [&str; 18] = [
         ADDRESS,
         BALANCE,
         BLOCK_NUMBER,
@@ -65,6 +67,7 @@ pub mod imports {
         NOW,
         RETURN,
         RETURNDATACOPY,
+        RETURNDATASIZE,
         SET_STORAGE,
         VALUE_TRANSFERRED,
     ];