memory experiment with wasm gpa

main.md

const std = @import("std");
const wasm_api = @import("node_modules/@thi.ng/wasm-api/zig/lib.zig");

var gpa = std.heap.GeneralPurposeAllocator(.{}){};
pub const WASM_ALLOCATOR = gpa.allocator();

pub export fn start() i32 {
    const allocator = wasm_api.allocator().?;
    const page_size = 65_536;
    const n_pages = 1024 * 64;
    for (0..n_pages) |i| {
        _ = allocator.alloc(u8, page_size) catch {
            wasm_api.printStr("page_size");
            wasm_api.printU32(page_size);
            wasm_api.printStr("i");
            wasm_api.printU32(i);
            wasm_api.printStr("n_pages");
            wasm_api.printU32(n_pages);
            wasm_api.panic("out of memory - 6351a5fe", null, 0);
        };
    }
    return 0;
}

[DEBUG] wasm: page_size console.js:6:12
[DEBUG] wasm: 65536 console.js:6:12
[DEBUG] wasm: i console.js:6:12
[DEBUG] wasm: 65491 console.js:6:12
[DEBUG] wasm: n_pages console.js:6:12
[DEBUG] wasm: 65536 console.js:6:12
Sourcegraph browser extension is running contentPage.main.bundle.js:78945:11
Uncaught (in promise) Error: Panic: out of memory - 6351a5fe
    <anonymous> deferror.js:3
    _panic bridge.js:68
    <anonymous> todo.ts:12
    async* todo.ts:13

Wasm is allowed to allocate have up to 4GiB in the browser. We allocated 65491 pages (3.997253417969 GiB), meaning that the leftover memory is used for other stack operations.