"PHP is compiled or limited to using 32-bit integers"

[mglaman]

Running Drupal 10.3, I get the following warning

You are running on a system where PHP is compiled or limited to using 32-bit integers. This will limit the range of dates and timestamps to the years 1901-2038. Read about the limitations of 32-bit PHP.

[mglaman]

Looks like it has nothing to do with php-wasm: emscripten-core/emscripten#12087

But there is an experimental flag: emscripten-core/emscripten#17708

https://emscripten.org/docs/tools_reference/settings_reference.html?highlight=memory64#memory64

-sMEMORY64

It's tied to the larger WebAssembly spec: https://github.com/WebAssembly/memory64

[mglaman]

In Makefile we can do something like:

MEMORY64       ?=0

This way it defaults to 32bit, but someone can pass 1 for 64bit or 2 for the mix.

		-s MODULARIZE=1                          \
		-s ASYNCIFY=1                            \
		-s MEMORY64=${MEMORY64}                  \

[mglaman]

Announcement of support as well: https://v8.dev/features/wasm-bigint

[mglaman]

Actually this shows Memory64 support: https://webassembly.org/features/. It looks like it's all behind feature flags.

I wonder if the -sWASM_BIGINT flag would be enough? That has wide spread support.

[mglaman]

I tried a build with -sWASM_BIGINT and it crashed: Cannot convert 0 to a BigInt.

500: Internal Server Error.
================================================================================

Stacktrace:
TypeError: Cannot convert 0 to a BigInt
    at ret.<computed> (http://localhost/php-cgi-worker.mjs:9:380235)
    at wasm://wasm/0058e82e:wasm-function[1787]:0x150853
    at wasm://wasm/0058e82e:wasm-function[175]:0x19ff0
    at wasm://wasm/0058e82e:wasm-function[924]:0xad5ea
    at wasm://wasm/0058e82e:wasm-function[387]:0x39bdc
    at wasm://wasm/0058e82e:wasm-function[463]:0x4e5b1
    at ret.<computed> (http://localhost/php-cgi-worker.mjs:9:380235)
    at wasm://wasm/d3b27a3e:wasm-function[117]:0x1faf
    at http://localhost/php-cgi-worker.mjs.wasm:wasm-function[1739]:0x2cf170
    at http://localhost/php-cgi-worker.mjs.wasm:wasm-function[6296]:0x825491
================================================================================

STDERR:

================================================================================

STDOUT:

================================================================================

Looking at the stack trace: d3b27a3e:0x1faf was a call to call $env.sqlite3_open_v2

[mglaman]

Also, even with the flag this test failed:

test('PHP_INT_SIZE', async () => {
	const php = new PhpNode();

	let stdOut = '', stdErr = '';

	php.addEventListener('output', (event) => event.detail.forEach(line => void (stdOut += line)));
	php.addEventListener('error',  (event) => event.detail.forEach(line => void (stdErr += line)));

	await php.binary;

	const exitCode = await php.run(`<?php var_dump(PHP_INT_SIZE);`);

	assert.equal(exitCode, 0);
	assert.equal(stdOut, `int(4)\n`);
	assert.equal(stdErr, '');
})

[mglaman]

-s MEMORY64 assumes -sWASM_BIGINT which was crashing. Maybe this cannot be done quite yet