Introduce gr_exec_settings sys-call

core-backend/src/env.rs

@@ -277,6 +277,7 @@ where
 {
     #[rustfmt::skip]
     fn bind_funcs(builder: &mut EnvBuilder<Ext>) {
+        builder.add_func(ExecSettings, wrap_common_func!(FuncsHandler::exec_settings, (3) -> ()));
         builder.add_func(BlockHeight, wrap_common_func!(FuncsHandler::block_height, (2) -> ()));
         builder.add_func(BlockTimestamp,wrap_common_func!(FuncsHandler::block_timestamp, (2) -> ()));
         builder.add_func(CreateProgram, wrap_common_func!(FuncsHandler::create_program, (8) -> ()));

core-backend/src/error.rs

@@ -127,6 +127,8 @@ pub enum UnrecoverableExecutionError {
     TooBigReadLen,
     #[display(fmt = "Cannot take data in payload range from message with size")]
     ReadWrongRange,
+    #[display(fmt = "Unexpected version of execution settings encountered ")]
+    UnexpectedExecSettingsVersion,
 }
 
 /// Memory error in infallible sys-call.

core-backend/src/funcs.rs

@@ -354,6 +354,22 @@ where
         Ok(res.is_err() as i32)
     }
 
+    #[host(cost = RuntimeCosts::ExecSettings)]
+    pub fn exec_settings(
+        ctx: &mut CallerWrap<'_, '_, Ext>,
+        gas: u64,
+        settings_ptr: u32,
+        settings_ver: u32,
+    ) -> Result<(u64, ()), HostError> {
+        let settings = ctx.ext_mut().exec_settings(settings_ver)?;
+        let settings_bytes = settings.to_bytes();
+        let settings_write = ctx
+            .manager
+            .register_write(settings_ptr, settings_bytes.len() as u32);
+        ctx.write(settings_write, settings_bytes)
+            .map_err(Into::into)
+    }
+
     #[host(cost = RuntimeCosts::BlockHeight)]
     pub fn block_height(
         ctx: &mut CallerWrap<'_, '_, Ext>,

core-backend/src/mock.rs

@@ -28,12 +28,12 @@ use core::{cell::Cell, fmt, fmt::Debug};
 use gear_core::{
     costs::RuntimeCosts,
     env::{Externalities, PayloadSliceLock, UnlockPayloadBound},
+    exec_settings::{ExecSettings, ExecSettingsV1},
     gas::{ChargeError, CounterType, CountersOwner, GasAmount, GasCounter, GasLeft},
     ids::{MessageId, ProgramId, ReservationId},
     memory::{Memory, MemoryError, MemoryInterval},
     message::{HandlePacket, InitPacket, ReplyPacket},
     pages::{PageNumber, PageU32Size, WasmPage, WASM_PAGE_SIZE},
-    percent::Percent,
 };
 use gear_core_errors::{ReplyCode, SignalCode};
 use gear_lazy_pages_common::ProcessAccessError;
@@ -115,15 +115,23 @@ impl Externalities for MockExt {
     fn free(&mut self, _page: WasmPage) -> Result<(), Self::AllocError> {
         Err(Error)
     }
+    fn exec_settings(&self, version: u32) -> Result<ExecSettings, Self::FallibleError> {
+        match version {
+            1 => Ok(ExecSettings::V1(ExecSettingsV1 {
+                performance_multiplier_percent: 100,
+                existential_deposit: 10,
+                mailbox_threshold: 20,
+                gas_to_value_multiplier: 30,
+            })),
+            _ => unreachable!("Unexpected version of execution settings"),
+        }
+    }
     fn block_height(&self) -> Result<u32, Self::UnrecoverableError> {
         Ok(0)
     }
     fn block_timestamp(&self) -> Result<u64, Self::UnrecoverableError> {
         Ok(0)
     }
-    fn performance_multiplier(&self) -> Result<Percent, Self::UnrecoverableError> {
-        Ok(Percent::new(100))
-    }
     fn send_init(&mut self) -> Result<u32, Self::UnrecoverableError> {
         Ok(0)
     }

core-processor/src/configs.rs

@@ -172,6 +172,8 @@ pub struct ExecutionSettings {
     pub random_data: (Vec<u8>, u32),
     /// Rent cost per block.
     pub rent_cost: u128,
+    /// Value per gas multiplier.
+    pub gas_to_value_multiplier: u128,
 }
 
 /// Stable parameters for the whole block across processing runs.
@@ -221,4 +223,6 @@ pub struct BlockConfig {
     pub code_instrumentation_byte_cost: u64,
     /// Rent cost per block.
     pub rent_cost: u128,
+    /// Value per gas multiplier.
+    pub gas_to_value_multiplier: u128,
 }

core-processor/src/executor.rs

@@ -222,6 +222,7 @@ where
         reservation: settings.reservation,
         random_data: settings.random_data,
         rent_cost: settings.rent_cost,
+        gas_to_value_multiplier: settings.gas_to_value_multiplier,
     };
 
     let lazy_pages_weights = context.page_costs.lazy_pages_weights();
@@ -418,6 +419,7 @@ where
         random_data: Default::default(),
         system_reservation: Default::default(),
         rent_cost: Default::default(),
+        gas_to_value_multiplier: Default::default(),
     };
 
     let lazy_pages_weights = context.page_costs.lazy_pages_weights();

core-processor/src/ext.rs

@@ -27,6 +27,7 @@ use alloc::{
 use gear_core::{
     costs::{HostFnWeights, RuntimeCosts},
     env::{Externalities, PayloadSliceLock, UnlockPayloadBound},
+    exec_settings::{ExecSettings, ExecSettingsV1},
     gas::{
         ChargeError, ChargeResult, CounterType, CountersOwner, GasAllowanceCounter, GasAmount,
         GasCounter, GasLeft, Token, ValueCounter,
@@ -109,6 +110,8 @@ pub struct ProcessorContext {
     pub random_data: (Vec<u8>, u32),
     /// Rent cost per block.
     pub rent_cost: u128,
+    /// Gas to value multiplier.
+    pub gas_to_value_multiplier: u128,
 }
 
 #[cfg(any(feature = "mock", test))]
@@ -154,6 +157,7 @@ impl ProcessorContext {
             reservation: 0,
             random_data: ([0u8; 32].to_vec(), 0),
             rent_cost: 0,
+            gas_to_value_multiplier: Default::default(),
         }
     }
 }
@@ -721,6 +725,18 @@ impl Externalities for Ext {
             .map_err(Into::into)
     }
 
+    fn exec_settings(&self, version: u32) -> Result<ExecSettings, Self::UnrecoverableError> {
+        match version {
+            1 => Ok(ExecSettings::V1(ExecSettingsV1 {
+                performance_multiplier_percent: self.context.performance_multiplier.value(),
+                existential_deposit: self.context.existential_deposit,
+                mailbox_threshold: self.context.mailbox_threshold,
+                gas_to_value_multiplier: self.context.gas_to_value_multiplier,
+            })),
+            _ => Err(UnrecoverableExecutionError::UnexpectedExecSettingsVersion.into()),
+        }
+    }
+
     fn block_height(&self) -> Result<u32, Self::UnrecoverableError> {
         Ok(self.context.block_info.height)
     }
@@ -729,10 +745,6 @@ impl Externalities for Ext {
         Ok(self.context.block_info.timestamp)
     }
 
-    fn performance_multiplier(&self) -> Result<Percent, Self::UnrecoverableError> {
-        Ok(self.context.performance_multiplier)
-    }
-
     fn send_init(&mut self) -> Result<u32, Self::FallibleError> {
         let handle = self.context.message_context.send_init()?;
         Ok(handle)

core-processor/src/processing.rs

@@ -71,6 +71,7 @@ where
         reservation,
         write_cost,
         rent_cost,
+        gas_to_value_multiplier,
         ..
     } = block_config.clone();
 
@@ -89,6 +90,7 @@ where
         reservation,
         random_data,
         rent_cost,
+        gas_to_value_multiplier,
     };
 
     let dispatch = execution_context.dispatch;

core/src/costs.rs

@@ -136,6 +136,9 @@ pub struct HostFnWeights {
     /// Weight per payload byte by `gr_read`.
     pub gr_read_per_byte: u64,
 
+    /// Weight of calling `gr_exec_settings`.
+    pub gr_exec_settings: u64,
+
     /// Weight of calling `gr_block_height`.
     pub gr_block_height: u64,
 
@@ -349,6 +352,8 @@ pub enum RuntimeCosts {
     Read,
     /// Weight of calling `gr_read` per read buffer bytes number.
     ReadPerByte(u32),
+    /// Weight of calling `gr_exec_settings`.
+    ExecSettings,
     /// Weight of calling `gr_block_height`.
     BlockHeight,
     /// Weight of calling `gr_block_timestamp`.
@@ -475,6 +480,7 @@ impl RuntimeCosts {
             Size => s.gr_size,
             Read => s.gr_read,
             ReadPerByte(len) => cost_per_byte(s.gr_read_per_byte, len),
+            ExecSettings => s.gr_exec_settings,
             BlockHeight => s.gr_block_height,
             BlockTimestamp => s.gr_block_timestamp,
             Random => s.gr_random,

core/src/env.rs

@@ -19,11 +19,11 @@
 //! Environment for running a module.
 
 use crate::{
+    exec_settings::ExecSettings,
     ids::{MessageId, ProgramId, ReservationId},
     memory::Memory,
     message::{HandlePacket, InitPacket, MessageContext, Payload, ReplyPacket},
     pages::WasmPage,
-    percent::Percent,
 };
 use alloc::collections::BTreeSet;
 use core::{fmt::Display, mem};
@@ -198,15 +198,16 @@ pub trait Externalities {
     /// should be `free`-d separately.
     fn free(&mut self, page: WasmPage) -> Result<(), Self::AllocError>;
 
+    /// Get execution settings currently set in the system and in the form
+    /// corresponded to the requested version.
+    fn exec_settings(&self, version: u32) -> Result<ExecSettings, Self::UnrecoverableError>;
+
     /// Get the current block height.
     fn block_height(&self) -> Result<u32, Self::UnrecoverableError>;
 
     /// Get the current block timestamp.
     fn block_timestamp(&self) -> Result<u64, Self::UnrecoverableError>;
 
-    /// Get current performance multiplier.
-    fn performance_multiplier(&self) -> Result<Percent, Self::UnrecoverableError>;
-
     /// Initialize a new incomplete message for another program and return its handle.
     fn send_init(&mut self) -> Result<u32, Self::FallibleError>;
 

core/src/exec_settings.rs

@@ -0,0 +1,53 @@
+// This file is part of Gear.
+
+// Copyright (C) 2021-2023 Gear Technologies Inc.
+// SPDX-License-Identifier: GPL-3.0-or-later WITH Classpath-exception-2.0
+
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+//! Execution settings
+
+use core::{mem, slice};
+
+/// All supported versions of execution settings
+pub enum ExecSettings {
+    /// Values of execution settings V1
+    V1(ExecSettingsV1),
+}
+
+impl ExecSettings {
+    /// Returns byte representation of execution settings
+    pub fn to_bytes(&self) -> &[u8] {
+        match self {
+            ExecSettings::V1(v1) => {
+                let ptr = v1 as *const ExecSettingsV1 as *const u8;
+                unsafe { slice::from_raw_parts(ptr, mem::size_of::<ExecSettingsV1>()) }
+            }
+        }
+    }
+}
+
+/// Values of execution settings V1
+#[repr(C, packed)]
+#[derive(Debug, Clone, Copy)]
+pub struct ExecSettingsV1 {
+    /// Performance multiplier percentage
+    pub performance_multiplier_percent: u32,
+    /// Existential deposit
+    pub existential_deposit: u128,
+    /// Mailbox threshold
+    pub mailbox_threshold: u64,
+    /// Multiplier for converting gas into value
+    pub gas_to_value_multiplier: u128,
+}

core/src/lib.rs

@@ -30,6 +30,7 @@ extern crate alloc;
 pub mod code;
 pub mod costs;
 pub mod env;
+pub mod exec_settings;
 pub mod gas;
 pub mod ids;
 pub mod memory;

core/src/percent.rs

@@ -34,7 +34,7 @@ impl Percent {
         Self(value)
     }
 
-    /// Returns the inner `u16` value.
+    /// Returns the inner `u32` value.
     pub fn value(self) -> u32 {
         self.0
     }

examples/sys-calls/src/lib.rs

@@ -76,6 +76,13 @@ pub enum Kind {
     ReplyDetails(MessageId, [u8; 4]),
     SignalDetails,
     SignalDetailsWake,
+    // Expected values
+    ExecSettings {
+        performance_multiplier: u32,
+        existential_deposit: u128,
+        mailbox_threshold: u64,
+        gas_to_value_multiplier: u128,
+    },
     // Expected(block height)
     BlockHeight(u32),
     // Expected(block timestamp)

examples/sys-calls/src/wasm.rs

@@ -264,6 +264,34 @@ fn process(syscall_kind: Kind) {
         Kind::SignalDetailsWake => {
             panic!("must be called in handle_reply");
         }
+        Kind::ExecSettings {
+            performance_multiplier: expected_performance_multiplier_percent,
+            existential_deposit: expected_existential_deposit,
+            mailbox_threshold: expected_mailbox_threshold,
+            gas_to_value_multiplier: expected_gas_to_value_multiplier,
+        } => {
+            let settings = exec::settings();
+            let actual_performance_multiplier_percent = settings.performance_multiplier_percent;
+            assert_eq!(
+                actual_performance_multiplier_percent, expected_performance_multiplier_percent,
+                "Kind::ExecSettings: performance_multiplier test failed"
+            );
+            let actual_existential_deposit = settings.existential_deposit;
+            assert_eq!(
+                actual_existential_deposit, expected_existential_deposit,
+                "Kind::ExecSettings: existential_deposit test failed"
+            );
+            let actual_mailbox_threshold = settings.mailbox_threshold;
+            assert_eq!(
+                actual_mailbox_threshold, expected_mailbox_threshold,
+                "Kind::ExecSettings: mailbox_threshold test failed"
+            );
+            let actual_gas_to_value_multiplier = settings.gas_to_value_multiplier;
+            assert_eq!(
+                actual_gas_to_value_multiplier, expected_gas_to_value_multiplier,
+                "Kind::ExecSettings: gas_to_value_multiplier test failed"
+            );
+        }
         Kind::BlockHeight(expected_height) => {
             let actual_height = exec::block_height();
             assert_eq!(