Adds debug prints to HDP modules

Cargo.toml

@@ -31,7 +31,10 @@ futures = "0.3.31"
 hex = "0.4.3"
 http-body-util = "=0.1.0"
 indicatif = "0.17.9"
+keccak = "0.1.5"
+lazy_static = "1.5.0"
 num-bigint = "0.4.6"
+num-integer = "0.1.46"
 num-traits = "0.2.19"
 rand = "0.8"
 reqwest = "0.12.9"
@@ -53,8 +56,6 @@ tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 utoipa = { version = "5.3.1", features = ["axum_extras"] }
 utoipa-swagger-ui = { version = "9", features = ["axum"] }
 version-compare = "=0.0.11"
-num-integer = "0.1.46"
-keccak = "0.1.5"
 
 dry_hint_processor = { path = "crates/dry_hint_processor" }
 eth_essentials_cairo_vm_hints = { path = "packages/eth_essentials/cairo_vm_hints" }

crates/dry_hint_processor/src/syscall_handler/mod.rs

@@ -14,7 +14,8 @@ use hints::vars;
 use serde::{Deserialize, Serialize};
 use starknet::CallContractHandler as StarknetCallContractHandler;
 use syscall_handler::{
-    felt_from_ptr, keccak::KeccakHandler, run_handler, traits, SyscallExecutionError, SyscallResult, SyscallSelector, WriteResponseResult,
+    call_contract, call_contract::debug::DebugCallContractHandler, felt_from_ptr, keccak::KeccakHandler, run_handler, traits,
+    SyscallExecutionError, SyscallResult, SyscallSelector, WriteResponseResult,
 };
 use tokio::{sync::RwLock, task};
 use types::{
@@ -80,6 +81,8 @@ impl SyscallHandlerWrapper {
 pub struct CallContractHandlerRelay {
     pub evm_call_contract_handler: EvmCallContractHandler,
     pub starknet_call_contract_handler: StarknetCallContractHandler,
+    #[serde(skip)]
+    pub debug_call_contract_handler: DebugCallContractHandler,
 }
 
 impl traits::SyscallHandler for CallContractHandlerRelay {
@@ -93,13 +96,18 @@ impl traits::SyscallHandler for CallContractHandlerRelay {
     }
 
     async fn execute(&mut self, request: Self::Request, vm: &mut VirtualMachine) -> SyscallResult<Self::Response> {
-        let chain_id = <Felt252 as TryInto<u128>>::try_into(*vm.get_integer((request.calldata_start + 2)?)?)
-            .map_err(|e| SyscallExecutionError::InternalError(e.to_string().into()))?;
-
-        match chain_id {
-            ETHEREUM_MAINNET_CHAIN_ID | ETHEREUM_TESTNET_CHAIN_ID => self.evm_call_contract_handler.execute(request, vm).await,
-            STARKNET_MAINNET_CHAIN_ID | STARKNET_TESTNET_CHAIN_ID => self.starknet_call_contract_handler.execute(request, vm).await,
-            _ => Err(SyscallExecutionError::InternalError(Box::from("Unknown chain id"))),
+        match request.contract_address {
+            v if v == call_contract::debug::CONTRACT_ADDRESS => self.debug_call_contract_handler.execute(request, vm).await,
+            _ => {
+                let chain_id = <Felt252 as TryInto<u128>>::try_into(*vm.get_integer((request.calldata_start + 2)?)?)
+                    .map_err(|e| SyscallExecutionError::InternalError(e.to_string().into()))?;
+
+                match chain_id {
+                    ETHEREUM_MAINNET_CHAIN_ID | ETHEREUM_TESTNET_CHAIN_ID => self.evm_call_contract_handler.execute(request, vm).await,
+                    STARKNET_MAINNET_CHAIN_ID | STARKNET_TESTNET_CHAIN_ID => self.starknet_call_contract_handler.execute(request, vm).await,
+                    _ => Err(SyscallExecutionError::InternalError(Box::from("Unknown chain id"))),
+                }
+            }
         }
     }
 

crates/sound_hint_processor/src/syscall_handler/mod.rs

@@ -17,7 +17,8 @@ use cairo_vm::{
 use hints::vars;
 use serde::{Deserialize, Serialize};
 use syscall_handler::{
-    felt_from_ptr, keccak::KeccakHandler, run_handler, traits, SyscallExecutionError, SyscallResult, SyscallSelector, WriteResponseResult,
+    call_contract, call_contract::debug::DebugCallContractHandler, felt_from_ptr, keccak::KeccakHandler, run_handler, traits,
+    SyscallExecutionError, SyscallResult, SyscallSelector, WriteResponseResult,
 };
 use tokio::{sync::RwLock, task};
 use types::{
@@ -85,13 +86,15 @@ impl CairoType for Memorizer {
 pub struct CallContractHandlerRelay {
     pub evm_call_contract_handler: EvmCallContractHandler,
     pub starknet_call_contract_handler: StarknetCallContractHandler,
+    pub debug_call_contract_handler: DebugCallContractHandler,
 }
 
 impl CallContractHandlerRelay {
     pub fn new(dict_manager: Rc<RefCell<DictManager>>) -> Self {
         Self {
             evm_call_contract_handler: EvmCallContractHandler::new(dict_manager.clone()),
             starknet_call_contract_handler: StarknetCallContractHandler::new(dict_manager),
+            debug_call_contract_handler: DebugCallContractHandler,
         }
     }
 }
@@ -107,13 +110,18 @@ impl traits::SyscallHandler for CallContractHandlerRelay {
     }
 
     async fn execute(&mut self, request: Self::Request, vm: &mut VirtualMachine) -> SyscallResult<Self::Response> {
-        let chain_id = <Felt252 as TryInto<u128>>::try_into(*vm.get_integer((request.calldata_start + 2)?)?)
-            .map_err(|e| SyscallExecutionError::InternalError(e.to_string().into()))?;
-
-        match chain_id {
-            ETHEREUM_MAINNET_CHAIN_ID | ETHEREUM_TESTNET_CHAIN_ID => self.evm_call_contract_handler.execute(request, vm).await,
-            STARKNET_MAINNET_CHAIN_ID | STARKNET_TESTNET_CHAIN_ID => self.starknet_call_contract_handler.execute(request, vm).await,
-            _ => Err(SyscallExecutionError::InternalError(Box::from("Unknown chain id"))),
+        match request.contract_address {
+            v if v == call_contract::debug::CONTRACT_ADDRESS => self.debug_call_contract_handler.execute(request, vm).await,
+            _ => {
+                let chain_id = <Felt252 as TryInto<u128>>::try_into(*vm.get_integer((request.calldata_start + 2)?)?)
+                    .map_err(|e| SyscallExecutionError::InternalError(e.to_string().into()))?;
+
+                match chain_id {
+                    ETHEREUM_MAINNET_CHAIN_ID | ETHEREUM_TESTNET_CHAIN_ID => self.evm_call_contract_handler.execute(request, vm).await,
+                    STARKNET_MAINNET_CHAIN_ID | STARKNET_TESTNET_CHAIN_ID => self.starknet_call_contract_handler.execute(request, vm).await,
+                    _ => Err(SyscallExecutionError::InternalError(Box::from("Unknown chain id"))),
+                }
+            }
         }
     }
 
@@ -129,6 +137,7 @@ pub struct SyscallHandler {
     #[serde(skip)]
     pub syscall_ptr: Option<Relocatable>,
     pub call_contract_handler: CallContractHandlerRelay,
+    // pub debug_handler: DebugHandler,
     #[serde(skip)]
     pub keccak_handler: KeccakHandler,
 }

crates/syscall_handler/Cargo.toml

@@ -5,10 +5,11 @@ edition = "2021"
 
 [dependencies]
 cairo-vm.workspace = true
-thiserror.workspace = true
-types.workspace = true
-num-integer.workspace = true
 keccak.workspace = true
 num-bigint.workspace = true
+num-integer.workspace = true
 num-traits.workspace = true
-serde.workspace = true
+serde.workspace = true
+strum_macros.workspace = true
+thiserror.workspace = true
+types.workspace = true

crates/syscall_handler/src/call_contract/debug.rs

@@ -0,0 +1,141 @@
+use cairo_vm::{types::relocatable::Relocatable, vm::vm_core::VirtualMachine, Felt252};
+use serde::{Deserialize, Serialize};
+use strum_macros::FromRepr;
+use types::cairo::{
+    new_syscalls::{CallContractRequest, CallContractResponse},
+    traits::CairoType,
+};
+
+use crate::{traits, SyscallExecutionError, SyscallResult, WriteResponseResult};
+
+pub const CONTRACT_ADDRESS: Felt252 = Felt252::from_hex_unchecked("0x6465627567"); // 'debug' in hex
+
+#[derive(FromRepr)]
+pub enum CallHandlerId {
+    Print = 0,
+    PrintArray = 1,
+}
+
+#[derive(Debug, Default, Serialize, Deserialize, Clone)]
+pub struct DebugCallContractHandler;
+
+impl traits::SyscallHandler for DebugCallContractHandler {
+    type Request = CallContractRequest;
+    type Response = CallContractResponse;
+
+    fn read_request(&mut self, vm: &VirtualMachine, ptr: &mut Relocatable) -> SyscallResult<Self::Request> {
+        let ret = Self::Request::from_memory(vm, *ptr)?;
+        *ptr = (*ptr + Self::Request::cairo_size())?;
+        Ok(ret)
+    }
+
+    async fn execute(&mut self, request: Self::Request, vm: &mut VirtualMachine) -> SyscallResult<Self::Response> {
+        let call_handler_id = CallHandlerId::try_from(request.selector)?;
+        match call_handler_id {
+            CallHandlerId::Print => {
+                let field_len = (request.calldata_end - request.calldata_start)?;
+                let fields = vm
+                    .get_integer_range(request.calldata_start, field_len)?
+                    .into_iter()
+                    .map(|f| (*f.as_ref()))
+                    .collect::<Vec<Felt252>>();
+
+                let str = decode_byte_array_felts(fields);
+                println!("{}", str);
+                Ok(Self::Response {
+                    retdata_start: request.calldata_end,
+                    retdata_end: request.calldata_end,
+                })
+            }
+            CallHandlerId::PrintArray => {
+                let field_len = (request.calldata_end - request.calldata_start)?;
+                let fields = vm
+                    .get_integer_range(request.calldata_start, field_len)?
+                    .into_iter()
+                    .map(|f| (*f.as_ref()))
+                    .collect::<Vec<Felt252>>();
+
+                println!("{:?}", fields);
+
+                Ok(Self::Response {
+                    retdata_start: request.calldata_end,
+                    retdata_end: request.calldata_end,
+                })
+            }
+        }
+    }
+
+    fn write_response(&mut self, _response: Self::Response, _vm: &mut VirtualMachine, _ptr: &mut Relocatable) -> WriteResponseResult {
+        Ok(())
+    }
+}
+
+// Decodes a serialized byte array of felts into a ascii string
+fn decode_byte_array_felts(felts: Vec<Felt252>) -> String {
+    // 1) Parse how many full 31-byte chunks we have.
+    let n_full: usize = felts[0].try_into().expect("n_full not convertible");
+
+    // 2) Read each 31-byte chunk in big-endian order.
+    let mut bytes = Vec::new();
+    for i in 0..n_full {
+        let chunk = &felts[1 + i];
+        let chunk_be: Vec<u8> = chunk.to_bytes_be().to_vec();
+
+        // Convert if chain to match
+        match chunk_be.len().cmp(&31) {
+            std::cmp::Ordering::Less => {
+                // Prepend leading zeros if needed
+                let mut padded = vec![0u8; 31 - chunk_be.len()];
+                padded.extend_from_slice(&chunk_be);
+                bytes.extend_from_slice(&padded);
+            }
+            std::cmp::Ordering::Greater => {
+                // If somehow bigger, take the last 31 bytes
+                bytes.extend_from_slice(&chunk_be[chunk_be.len() - 31..]);
+            }
+            std::cmp::Ordering::Equal => {
+                bytes.extend_from_slice(&chunk_be);
+            }
+        }
+    }
+
+    // 3) The next felt is the pending word, followed by the pending length.
+    let pending_word = &felts[1 + n_full];
+    let pending_len: usize = felts[1 + n_full + 1].try_into().unwrap();
+
+    if pending_len > 0 {
+        let pending_be: Vec<u8> = pending_word.to_bytes_be().to_vec();
+        // Convert if chain to match
+        match pending_be.len().cmp(&pending_len) {
+            std::cmp::Ordering::Less => {
+                // Again pad if needed
+                let mut padded = vec![0u8; pending_len - pending_be.len()];
+                padded.extend_from_slice(&pending_be);
+                bytes.extend_from_slice(&padded);
+            }
+            std::cmp::Ordering::Greater => {
+                bytes.extend_from_slice(&pending_be[pending_be.len() - pending_len..]);
+            }
+            std::cmp::Ordering::Equal => {
+                bytes.extend_from_slice(&pending_be);
+            }
+        }
+    }
+
+    // 4) Convert raw bytes to a UTF-8 string (or ASCII if you know it is ASCII).
+    String::from_utf8(bytes).expect("Invalid UTF-8")
+}
+
+impl TryFrom<Felt252> for CallHandlerId {
+    type Error = SyscallExecutionError;
+    fn try_from(value: Felt252) -> Result<Self, Self::Error> {
+        Self::from_repr(value.try_into().map_err(|e| Self::Error::InvalidSyscallInput {
+            input: value,
+            info: format!("{}", e),
+        })?)
+        .ok_or(Self::Error::InvalidSyscallInput {
+            input: value,
+            info: "Invalid function identifier".to_string(),
+        })
+    }
+}

crates/syscall_handler/src/call_contract/mod.rs

@@ -0,0 +1 @@
+pub mod debug;

crates/syscall_handler/src/lib.rs

@@ -3,6 +3,7 @@
 #![warn(unused_crate_dependencies)]
 #![forbid(unsafe_code)]
 
+pub mod call_contract;
 pub mod keccak;
 pub mod traits;
 

hdp_cairo/src/debug.cairo

@@ -0,0 +1,2 @@
+mod printer;
+pub use printer::{print, print_array}; 

hdp_cairo/src/debug/printer.cairo

@@ -0,0 +1,25 @@
+use starknet::syscalls::call_contract_syscall;
+use starknet::SyscallResultTrait;
+use core::fmt::Display;
+
+
+const DEBUG_CONTRACT_ADDRESS: felt252 = 'debug';
+const PRINT: felt252 = 0;
+const PRINT_ARRAY: felt252 = 1;
+
+pub fn print<T, +Display<T>, +Drop<T>>(value: T) {
+    let msg: ByteArray = format!("{}", value);
+    let mut output_array = array![];
+    msg.serialize(ref output_array);
+    call_contract_syscall(DEBUG_CONTRACT_ADDRESS.try_into().unwrap(), PRINT, output_array.span())
+        .unwrap_syscall();
+}
+
+pub fn print_array(array: Array<felt252>) {
+    call_contract_syscall(
+        DEBUG_CONTRACT_ADDRESS.try_into().unwrap(),
+        PRINT_ARRAY,
+        array.span()
+    )
+        .unwrap_syscall();
+}

hdp_cairo/src/lib.cairo

@@ -1,5 +1,6 @@
 pub mod evm;
 pub mod starknet;
+pub mod debug;
 
 #[derive(Serde, Drop)]
 pub struct HDP {

src/contract_bootloader/execute_syscalls.cairo

@@ -126,6 +126,11 @@ func execute_call_contract{
     let state_access_type = request.contract_address;
     let field = request.selector;
 
+    // Debug Contract does not need to be executed
+    if (request.contract_address == 'debug') {
+        return ();
+    }
+
     let layout = chain_id_to_layout(request.calldata_start[2]);
     let output_ptr = response.retdata_start;
 

tests/src/lib.cairo

@@ -1,2 +1,3 @@
 pub mod evm;
 pub mod starknet;
+pub mod utils;

tests/src/lib.rs

@@ -7,6 +7,9 @@ pub mod evm;
 #[cfg(test)]
 pub mod starknet;
 
+#[cfg(test)]
+pub mod utils;
+
 #[cfg(test)]
 mod test_utils {
     use std::{env, path::PathBuf};

tests/src/utils.cairo

@@ -0,0 +1 @@
+pub mod debug;