feat: adding option to set initial and max memory (AztecProtocol#3265)

This PR adds an object with type `BackendOptions`, allowing to set
number of threads and the memory to be allocated.

The initial motivation was to allow for `bb.js` to generate proofs on
phones, as some would immediately kill the worker if the default value
for `maximum` was used (`2 ** 16`, about 4gb).

Turned it into an object so it closely matches the implementation in
`@noir-lang/backend_barretenberg`

# Checklist:
Remove the checklist to signal you've completed it. Enable auto-merge if
the PR is ready to merge.
- [ ] If the pull request requires a cryptography review (e.g.
cryptographic algorithm implementations) I have added the 'crypto' tag.
- [ ] I have reviewed my diff in github, line by line and removed
unexpected formatting changes, testing logs, or commented-out code.
- [ ] Every change is related to the PR description.
- [ ] I have
[linked](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue)
this pull request to relevant issues (if any exist).

barretenberg/acir_tests/browser-test-app/src/index.ts

@@ -13,7 +13,7 @@ async function runTest(
   const CIRCUIT_SIZE = 2 ** 19;
 
   debug("starting test...");
-  const api = await Barretenberg.new(threads);
+  const api = await Barretenberg.new({ threads });
 
   // Important to init slab allocator as first thing, to ensure maximum memory efficiency.
   await api.commonInitSlabAllocator(CIRCUIT_SIZE);

barretenberg/ts/README.md

@@ -89,7 +89,7 @@ To create the API and do a blake2s hash:
 ```typescript
 import { Crs, Barretenberg, RawBuffer } from './index.js';
 
-const api = await Barretenberg.new(/* num_threads */ 1);
+const api = await Barretenberg.new(/* num_threads */ { threads: 1 });
 const input = Buffer.from('hello world!');
 const result = await api.blake2s(input);
 await api.destroy();

barretenberg/ts/src/barretenberg/blake2s.test.ts

@@ -5,7 +5,7 @@ describe('blake2s async', () => {
   let api: Barretenberg;
 
   beforeAll(async () => {
-    api = await Barretenberg.new(1);
+    api = await Barretenberg.new({ threads: 1 });
   });
 
   afterAll(async () => {

barretenberg/ts/src/barretenberg/common.test.ts

@@ -4,7 +4,7 @@ describe('env', () => {
   let api: Barretenberg;
 
   beforeAll(async () => {
-    api = await Barretenberg.new(3);
+    api = await Barretenberg.new({ threads: 3 });
   }, 15000);
 
   afterAll(async () => {

barretenberg/ts/src/barretenberg/index.ts

@@ -8,6 +8,11 @@ import createDebug from 'debug';
 
 const debug = createDebug('bb.js:wasm');
 
+export type BackendOptions = {
+  threads?: number;
+  memory?: { initial?: number; maximum?: number };
+};
+
 /**
  * The main class library consumers interact with.
  * It extends the generated api, and provides a static constructor "new" to compose components.
@@ -23,11 +28,11 @@ export class Barretenberg extends BarretenbergApi {
    * and blocking the main thread in the browser is not allowed.
    * It threads > 1 (defaults to hardware availability), child threads will be created on their own workers.
    */
-  static async new(desiredThreads?: number) {
+  static async new({ threads: desiredThreads, memory }: BackendOptions = {}) {
     const worker = createMainWorker();
     const wasm = getRemoteBarretenbergWasm<BarretenbergWasmMainWorker>(worker);
     const { module, threads } = await fetchModuleAndThreads(desiredThreads);
-    await wasm.init(module, threads, proxy(debug));
+    await wasm.init(module, threads, proxy(debug), memory?.initial, memory?.maximum);
     return new Barretenberg(worker, wasm);
   }
 

barretenberg/ts/src/barretenberg/schnorr.test.ts

@@ -8,7 +8,7 @@ describe('schnorr', () => {
   let api: Barretenberg;
 
   beforeAll(async () => {
-    api = await Barretenberg.new(1);
+    api = await Barretenberg.new({ threads: 1 });
   }, 30000);
 
   afterAll(async () => {

barretenberg/ts/src/main.ts

@@ -44,7 +44,7 @@ async function computeCircuitSize(bytecodePath: string, api: Barretenberg) {
 }
 
 async function init(bytecodePath: string, crsPath: string) {
-  const api = await Barretenberg.new(threads);
+  const api = await Barretenberg.new({ threads });
 
   const circuitSize = await getGates(bytecodePath, api);
   const subgroupSize = Math.pow(2, Math.ceil(Math.log2(circuitSize)));
@@ -70,7 +70,7 @@ async function init(bytecodePath: string, crsPath: string) {
 }
 
 async function initLite() {
-  const api = await Barretenberg.new(1);
+  const api = await Barretenberg.new({ threads: 1 });
 
   // Plus 1 needed! (Move +1 into Crs?)
   const crs = await Crs.new(1);
@@ -140,7 +140,7 @@ export async function prove(
 }
 
 export async function gateCount(bytecodePath: string) {
-  const api = await Barretenberg.new(1);
+  const api = await Barretenberg.new({ threads: 1 });
   try {
     const numberOfGates = await getGates(bytecodePath, api);