From ae0e8bf749558df0baae17db929175bec734ea7c Mon Sep 17 00:00:00 2001
From: Carl Woffenden <cwoffenden@gmail.com>
Date: Thu, 31 Oct 2024 16:52:38 +0100
Subject: [PATCH] Explicitly assert any changes to the stack address

---
 src/audio_worklet.js | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/audio_worklet.js b/src/audio_worklet.js
index 5367cd75dda23..b9223ab6a9ee3 100644
--- a/src/audio_worklet.js
+++ b/src/audio_worklet.js
@@ -64,6 +64,11 @@ function createWasmAudioWorkletProcessor(audioParams) {
         );
       }
       stackRestore(oldStackPtr);
+  
+#if ASSERTIONS
+      // Explicitly verify this later in process()
+      this.ctorOldStackPtr = oldStackPtr;
+#endif
     }
 
     static get parameterDescriptors() {
@@ -92,6 +97,7 @@ function createWasmAudioWorkletProcessor(audioParams) {
       for (i in parameters) stackMemoryNeeded += parameters[i].byteLength + {{{ C_STRUCTS.AudioParamFrame.__size__ }}}, ++numParams;
 
 #if ASSERTIONS
+      console.assert(oldStackPtr == this.ctorOldStackPtr, 'AudioWorklet stack address has unexpectedly moved');
       console.assert(outputViewsNeeded <= this.outputViews.length, `Too many AudioWorklet outputs (need ${outputViewsNeeded} but have stack space for ${this.outputViews.length})`);
 #endif