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chore(avm-simulator): add U128 overflow tests to AVM simulator #6281

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May 9, 2024
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chore(avm-simulator): add U128 overflow tests to AVM simulator #6281

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13 changes: 13 additions & 0 deletions noir-projects/noir-contracts/contracts/avm_test_contract/src/main.nr
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Original file line number Diff line number Diff line change
Expand Up @@ -140,6 +140,19 @@ contract AvmTest {
a + b
}

#[aztec(public-vm)]
fn u128_addition_overflow() -> U128 {
let max_u128: U128 = U128::from_hex("0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
let one: U128 = U128::from_integer(1);
max_u128 + one
}

#[aztec(public-vm)]
fn u128_from_integer_overflow() -> U128 {
let should_overflow: Field = 2.pow_32(128); // U128::max() + 1;
U128::from_integer(should_overflow)
}

/************************************************************************
* Hashing functions
************************************************************************/
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46 changes: 32 additions & 14 deletions yarn-project/simulator/src/avm/avm_simulator.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -85,22 +85,40 @@ describe('AVM simulator: transpiled Noir contracts', () => {
expect(isAvmBytecode(bytecode));
});

it('U128 addition', async () => {
const calldata: Fr[] = [
// First U128
new Fr(1),
new Fr(2),
// Second U128
new Fr(3),
new Fr(4),
];
const context = initContext({ env: initExecutionEnvironment({ calldata }) });
describe('U128 addition and overflows', () => {
it('U128 addition', async () => {
const calldata: Fr[] = [
// First U128
new Fr(1),
new Fr(2),
// Second U128
new Fr(3),
new Fr(4),
];
const context = initContext({ env: initExecutionEnvironment({ calldata }) });

const bytecode = getAvmTestContractBytecode('add_u128');
const results = await new AvmSimulator(context).executeBytecode(bytecode);
const bytecode = getAvmTestContractBytecode('add_u128');
const results = await new AvmSimulator(context).executeBytecode(bytecode);

expect(results.reverted).toBe(false);
expect(results.output).toEqual([new Fr(4), new Fr(6)]);
expect(results.reverted).toBe(false);
expect(results.output).toEqual([new Fr(4), new Fr(6)]);
});

it('Expect failure on U128::add() overflow', async () => {
const bytecode = getAvmTestContractBytecode('u128_addition_overflow');
const results = await new AvmSimulator(initContext()).executeBytecode(bytecode);
expect(results.reverted).toBe(true);
expect(results.revertReason?.message).toEqual('Reverted with output: attempt to add with overflow');
});

it('Expect failure on U128::from_integer() overflow', async () => {
const bytecode = getAvmTestContractBytecode('u128_from_integer_overflow');
const results = await new AvmSimulator(initContext()).executeBytecode(bytecode);
expect(results.reverted).toBe(true);
expect(results.revertReason?.message).toEqual(undefined);
// Note: compiler intrinsic messages (like below) are not known to the AVM
//expect(results.revertReason?.message).toEqual("Reverted with output: call to assert_max_bit_size 'self.__assert_max_bit_size(bit_size)'");
});
});

it('Assertion message', async () => {
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