feat: Memory only brillig (AztecProtocol#4215)

This PR adds: - Memory only brillig noir-lang/noir#4158 - Calldata and returndata noir-lang/noir#4159 We reserve some memory slots at the start of the memory space. We reserve 1024 items for the stack frame, the calldata size and the returndata size.
Swoir · Jan 30, 2024 · 6dc0ff9 · 6dc0ff9
1 parent d288059
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diff --git a/barretenberg/cpp/src/barretenberg/dsl/acir_format/serde/acir.hpp b/barretenberg/cpp/src/barretenberg/dsl/acir_format/serde/acir.hpp
diff --git a/noir/acvm-repo/acir/codegen/acir.cpp b/noir/acvm-repo/acir/codegen/acir.cpp
diff --git a/noir/acvm-repo/acir/src/lib.rs b/noir/acvm-repo/acir/src/lib.rs
@@ -31,9 +31,7 @@ mod reflection {
         path::{Path, PathBuf},
     };
 
-    use brillig::{
-        BinaryFieldOp, BinaryIntOp, BlackBoxOp, Opcode as BrilligOpcode, RegisterOrMemory,
-    };
+    use brillig::{BinaryFieldOp, BinaryIntOp, BlackBoxOp, Opcode as BrilligOpcode, ValueOrArray};
     use serde_reflection::{Tracer, TracerConfig};
 
     use crate::{
@@ -69,7 +67,7 @@ mod reflection {
         tracer.trace_simple_type::<BinaryIntOp>().unwrap();
         tracer.trace_simple_type::<BlackBoxOp>().unwrap();
         tracer.trace_simple_type::<Directive>().unwrap();
-        tracer.trace_simple_type::<RegisterOrMemory>().unwrap();
+        tracer.trace_simple_type::<ValueOrArray>().unwrap();
 
         let registry = tracer.registry().unwrap();
 

diff --git a/noir/acvm-repo/acir/tests/test_program_serialization.rs b/noir/acvm-repo/acir/tests/test_program_serialization.rs
@@ -20,7 +20,7 @@ use acir::{
     native_types::{Expression, Witness},
 };
 use acir_field::FieldElement;
-use brillig::{HeapArray, RegisterIndex, RegisterOrMemory};
+use brillig::{HeapArray, MemoryAddress, ValueOrArray};
 
 #[test]
 fn addition_circuit() {
@@ -173,15 +173,23 @@ fn simple_brillig_foreign_call() {
         inputs: vec![
             BrilligInputs::Single(w_input.into()), // Input Register 0,
         ],
-        // This tells the BrilligSolver which witnesses its output registers correspond to
+        // This tells the BrilligSolver which witnesses its output values correspond to
         outputs: vec![
             BrilligOutputs::Simple(w_inverted), // Output Register 1
         ],
-        bytecode: vec![brillig::Opcode::ForeignCall {
-            function: "invert".into(),
-            destinations: vec![RegisterOrMemory::RegisterIndex(RegisterIndex::from(0))],
-            inputs: vec![RegisterOrMemory::RegisterIndex(RegisterIndex::from(0))],
-        }],
+        bytecode: vec![
+            brillig::Opcode::CalldataCopy {
+                destination_address: MemoryAddress(0),
+                size: 1,
+                offset: 0,
+            },
+            brillig::Opcode::ForeignCall {
+                function: "invert".into(),
+                destinations: vec![ValueOrArray::MemoryAddress(MemoryAddress::from(0))],
+                inputs: vec![ValueOrArray::MemoryAddress(MemoryAddress::from(0))],
+            },
+            brillig::Opcode::Stop { return_data_offset: 0, return_data_size: 1 },
+        ],
         predicate: None,
     };
 
@@ -196,10 +204,11 @@ fn simple_brillig_foreign_call() {
     let bytes = Circuit::serialize_circuit(&circuit);
 
     let expected_serialization: Vec<u8> = vec![
-        31, 139, 8, 0, 0, 0, 0, 0, 0, 255, 173, 143, 49, 10, 64, 33, 12, 67, 99, 63, 124, 60, 142,
-        222, 192, 203, 56, 184, 56, 136, 120, 126, 5, 21, 226, 160, 139, 62, 40, 13, 45, 132, 68,
-        3, 80, 232, 124, 164, 153, 121, 115, 99, 155, 59, 172, 122, 231, 101, 56, 175, 80, 86, 221,
-        230, 31, 58, 196, 226, 83, 62, 53, 91, 16, 122, 10, 246, 84, 99, 243, 0, 30, 59, 1, 0, 0,
+        31, 139, 8, 0, 0, 0, 0, 0, 0, 255, 173, 143, 177, 10, 192, 32, 12, 68, 207, 148, 150, 118,
+        234, 175, 216, 63, 232, 207, 116, 232, 210, 161, 136, 223, 175, 98, 132, 27, 212, 69, 31,
+        132, 28, 23, 8, 119, 59, 0, 131, 204, 66, 154, 41, 222, 173, 219, 142, 113, 153, 121, 191,
+        44, 231, 21, 237, 144, 88, 43, 249, 11, 71, 156, 77, 245, 251, 249, 231, 119, 189, 214,
+        204, 89, 187, 11, 25, 130, 54, 1, 36, 1, 124, 242, 107, 1, 0, 0,
     ];
 
     assert_eq!(bytes, expected_serialization)
@@ -221,39 +230,54 @@ fn complex_brillig_foreign_call() {
 
     let brillig_data = Brillig {
         inputs: vec![
-            // Input Register 0
+            // Input 0,1,2
             BrilligInputs::Array(vec![
                 Expression::from(a),
                 Expression::from(b),
                 Expression::from(c),
             ]),
-            // Input Register 1
+            // Input 3
             BrilligInputs::Single(Expression {
                 mul_terms: vec![],
                 linear_combinations: vec![(fe_1, a), (fe_1, b), (fe_1, c)],
                 q_c: fe_0,
             }),
         ],
-        // This tells the BrilligSolver which witnesses its output registers correspond to
+        // This tells the BrilligSolver which witnesses its output values correspond to
         outputs: vec![
-            BrilligOutputs::Array(vec![a_times_2, b_times_3, c_times_4]), // Output Register 0
-            BrilligOutputs::Simple(a_plus_b_plus_c),                      // Output Register 1
-            BrilligOutputs::Simple(a_plus_b_plus_c_times_2),              // Output Register 2
+            BrilligOutputs::Array(vec![a_times_2, b_times_3, c_times_4]), // Output 0,1,2
+            BrilligOutputs::Simple(a_plus_b_plus_c),                      // Output 3
+            BrilligOutputs::Simple(a_plus_b_plus_c_times_2),              // Output 4
         ],
         bytecode: vec![
+            brillig::Opcode::CalldataCopy {
+                destination_address: MemoryAddress(32),
+                size: 3,
+                offset: 0,
+            },
+            brillig::Opcode::Const {
+                destination: MemoryAddress(0),
+                value: brillig::Value::from(32_usize),
+            },
+            brillig::Opcode::CalldataCopy {
+                destination_address: MemoryAddress(1),
+                size: 1,
+                offset: 3,
+            },
             // Oracles are named 'foreign calls' in brillig
             brillig::Opcode::ForeignCall {
                 function: "complex".into(),
                 inputs: vec![
-                    RegisterOrMemory::HeapArray(HeapArray { pointer: 0.into(), size: 3 }),
-                    RegisterOrMemory::RegisterIndex(RegisterIndex::from(1)),
+                    ValueOrArray::HeapArray(HeapArray { pointer: 0.into(), size: 3 }),
+                    ValueOrArray::MemoryAddress(MemoryAddress::from(1)),
                 ],
                 destinations: vec![
-                    RegisterOrMemory::HeapArray(HeapArray { pointer: 0.into(), size: 3 }),
-                    RegisterOrMemory::RegisterIndex(RegisterIndex::from(1)),
-                    RegisterOrMemory::RegisterIndex(RegisterIndex::from(2)),
+                    ValueOrArray::HeapArray(HeapArray { pointer: 0.into(), size: 3 }),
+                    ValueOrArray::MemoryAddress(MemoryAddress::from(35)),
+                    ValueOrArray::MemoryAddress(MemoryAddress::from(36)),
                 ],
             },
+            brillig::Opcode::Stop { return_data_offset: 32, return_data_size: 5 },
         ],
         predicate: None,
     };
@@ -269,13 +293,14 @@ fn complex_brillig_foreign_call() {
     let bytes = Circuit::serialize_circuit(&circuit);
 
     let expected_serialization: Vec<u8> = vec![
-        31, 139, 8, 0, 0, 0, 0, 0, 0, 255, 213, 83, 219, 10, 128, 48, 8, 117, 174, 139, 159, 179,
-        254, 160, 127, 137, 222, 138, 122, 236, 243, 19, 114, 32, 22, 244, 144, 131, 118, 64, 156,
-        178, 29, 14, 59, 74, 0, 16, 224, 66, 228, 64, 57, 7, 169, 53, 242, 189, 81, 114, 250, 134,
-        33, 248, 113, 165, 82, 26, 177, 2, 141, 177, 128, 198, 60, 15, 63, 245, 219, 211, 23, 215,
-        255, 139, 15, 251, 211, 112, 180, 28, 157, 212, 189, 100, 82, 179, 64, 170, 63, 109, 235,
-        190, 204, 135, 166, 178, 150, 216, 62, 154, 252, 250, 70, 147, 35, 220, 119, 93, 227, 4,
-        182, 131, 81, 25, 36, 4, 0, 0,
+        31, 139, 8, 0, 0, 0, 0, 0, 0, 255, 213, 83, 65, 10, 132, 48, 12, 76, 218, 237, 174, 123,
+        242, 11, 130, 62, 160, 250, 2, 255, 34, 222, 20, 61, 250, 124, 11, 78, 49, 4, 193, 131, 21,
+        52, 16, 210, 132, 105, 50, 77, 210, 140, 136, 152, 54, 177, 65, 13, 206, 12, 95, 74, 196,
+        181, 176, 254, 154, 212, 156, 46, 151, 191, 139, 163, 121, 1, 71, 123, 3, 199, 184, 15, 15,
+        157, 119, 202, 185, 36, 237, 159, 61, 248, 63, 159, 160, 46, 232, 23, 254, 15, 54, 67, 156,
+        96, 11, 213, 119, 82, 248, 116, 179, 104, 188, 163, 125, 15, 89, 213, 253, 139, 154, 221,
+        52, 206, 67, 191, 88, 5, 213, 52, 75, 113, 174, 96, 205, 201, 157, 24, 207, 197, 211, 157,
+        6, 50, 18, 233, 158, 72, 89, 1, 53, 215, 75, 175, 196, 4, 0, 0,
     ];
 
     assert_eq!(bytes, expected_serialization)

diff --git a/noir/acvm-repo/acvm/src/pwg/brillig.rs b/noir/acvm-repo/acvm/src/pwg/brillig.rs
@@ -1,5 +1,5 @@
 use acir::{
-    brillig::{ForeignCallParam, ForeignCallResult, RegisterIndex, Value},
+    brillig::{ForeignCallParam, ForeignCallResult, Value},
     circuit::{
         brillig::{Brillig, BrilligInputs, BrilligOutputs},
         OpcodeLocation,
@@ -8,7 +8,7 @@ use acir::{
     FieldElement,
 };
 use acvm_blackbox_solver::BlackBoxFunctionSolver;
-use brillig_vm::{Registers, VMStatus, VM};
+use brillig_vm::{VMStatus, VM};
 
 use crate::{pwg::OpcodeNotSolvable, OpcodeResolutionError};
 
@@ -69,16 +69,15 @@ impl<'b, B: BlackBoxFunctionSolver> BrilligSolver<'b, B> {
         acir_index: usize,
     ) -> Result<Self, OpcodeResolutionError> {
         // Set input values
-        let mut input_register_values: Vec<Value> = Vec::new();
-        let mut input_memory: Vec<Value> = Vec::new();
+        let mut calldata: Vec<Value> = Vec::new();
         // Each input represents an expression or array of expressions to evaluate.
         // Iterate over each input and evaluate the expression(s) associated with it.
-        // Push the results into registers and/or memory.
+        // Push the results into memory.
         // If a certain expression is not solvable, we stall the ACVM and do not proceed with Brillig VM execution.
         for input in &brillig.inputs {
             match input {
                 BrilligInputs::Single(expr) => match get_value(expr, initial_witness) {
-                    Ok(value) => input_register_values.push(value.into()),
+                    Ok(value) => calldata.push(value.into()),
                     Err(_) => {
                         return Err(OpcodeResolutionError::OpcodeNotSolvable(
                             OpcodeNotSolvable::ExpressionHasTooManyUnknowns(expr.clone()),
@@ -87,39 +86,26 @@ impl<'b, B: BlackBoxFunctionSolver> BrilligSolver<'b, B> {
                 },
                 BrilligInputs::Array(expr_arr) => {
                     // Attempt to fetch all array input values
-                    let memory_pointer = input_memory.len();
                     for expr in expr_arr.iter() {
                         match get_value(expr, initial_witness) {
-                            Ok(value) => input_memory.push(value.into()),
+                            Ok(value) => calldata.push(value.into()),
                             Err(_) => {
                                 return Err(OpcodeResolutionError::OpcodeNotSolvable(
                                     OpcodeNotSolvable::ExpressionHasTooManyUnknowns(expr.clone()),
                                 ))
                             }
                         }
                     }
-
-                    // Push value of the array pointer as a register
-                    input_register_values.push(Value::from(memory_pointer));
                 }
             }
         }
 
-        // Instantiate a Brillig VM given the solved input registers and memory
+        // Instantiate a Brillig VM given the solved calldata
         // along with the Brillig bytecode.
-        let input_registers = Registers::load(input_register_values);
-        let vm = VM::new(input_registers, input_memory, &brillig.bytecode, vec![], bb_solver);
+        let vm = VM::new(calldata, &brillig.bytecode, vec![], bb_solver);
         Ok(Self { vm, acir_index })
     }
 
-    pub fn get_registers(&self) -> &Registers {
-        self.vm.get_registers()
-    }
-
-    pub fn set_register(&mut self, register_index: usize, value: Value) {
-        self.vm.set_register(RegisterIndex(register_index), value);
-    }
-
     pub fn get_memory(&self) -> &[Value] {
         self.vm.get_memory()
     }
@@ -151,7 +137,7 @@ impl<'b, B: BlackBoxFunctionSolver> BrilligSolver<'b, B> {
         // Return the "resolution" to the caller who may choose to make subsequent calls
         // (when it gets foreign call results for example).
         match vm_status {
-            VMStatus::Finished => Ok(BrilligSolverStatus::Finished),
+            VMStatus::Finished { .. } => Ok(BrilligSolverStatus::Finished),
             VMStatus::InProgress => Ok(BrilligSolverStatus::InProgress),
             VMStatus::Failure { message, call_stack } => {
                 Err(OpcodeResolutionError::BrilligFunctionFailed {
@@ -179,8 +165,8 @@ impl<'b, B: BlackBoxFunctionSolver> BrilligSolver<'b, B> {
         // Finish the Brillig execution by writing the outputs to the witness map
         let vm_status = self.vm.get_status();
         match vm_status {
-            VMStatus::Finished => {
-                self.write_brillig_outputs(witness, brillig)?;
+            VMStatus::Finished { return_data_offset, return_data_size } => {
+                self.write_brillig_outputs(witness, return_data_offset, return_data_size, brillig)?;
                 Ok(())
             }
             _ => panic!("Brillig VM has not completed execution"),
@@ -190,24 +176,32 @@ impl<'b, B: BlackBoxFunctionSolver> BrilligSolver<'b, B> {
     fn write_brillig_outputs(
         &self,
         witness_map: &mut WitnessMap,
+        return_data_offset: usize,
+        return_data_size: usize,
         brillig: &Brillig,
     ) -> Result<(), OpcodeResolutionError> {
         // Write VM execution results into the witness map
-        for (i, output) in brillig.outputs.iter().enumerate() {
-            let register_value = self.vm.get_registers().get(RegisterIndex::from(i));
+        let memory = self.vm.get_memory();
+        let mut current_ret_data_idx = return_data_offset;
+        for output in brillig.outputs.iter() {
             match output {
                 BrilligOutputs::Simple(witness) => {
-                    insert_value(witness, register_value.to_field(), witness_map)?;
+                    insert_value(witness, memory[current_ret_data_idx].to_field(), witness_map)?;
+                    current_ret_data_idx += 1;
                 }
                 BrilligOutputs::Array(witness_arr) => {
-                    // Treat the register value as a pointer to memory
-                    for (i, witness) in witness_arr.iter().enumerate() {
-                        let value = &self.vm.get_memory()[register_value.to_usize() + i];
+                    for witness in witness_arr.iter() {
+                        let value = memory[current_ret_data_idx];
                         insert_value(witness, value.to_field(), witness_map)?;
+                        current_ret_data_idx += 1;
                     }
                 }
             }
         }
+        assert!(
+            current_ret_data_idx == return_data_offset + return_data_size,
+            "Brillig VM did not write the expected number of return values"
+        );
         Ok(())
     }