Add AMSC macro to RenderWidgetHostNSViewBridge
Minor
Commit Hash:
8b4415fa123afb8de47420ce4b7caa32b91e83b5
Commit Time: 2026-03-26 13:46:37
Impact Level: Minor
Generated By: webview2-upstream-sentry
Upstream Review:
View Upstream Review 🔗
📋 Summary
This commit adds the ADVANCED_MEMORY_SAFETY_CHECKS() macro to the RenderWidgetHostNSViewBridge class for enhanced memory safety checking. This is a Chromium security infrastructure macro that enables additional memory safety detection (such as use-after-free detection) to help identify potential memory safety issues. The change only adds one include and one macro invocation, with a TODO comment indicating the macro will be removed after the issue is fixed.
🎯 Impact Analysis
The impact of this change on WebView2Mac is minimal. Key analysis:
1. **RenderWidgetHostNSViewBridge is a key class for WebView2Mac**: This class is the bridge in the Remote Cocoa architecture connecting RenderWidgetHostViewCocoa (app shim process) and RenderWidgetHostViewMac (browser process), responsible for forwarding rendering-related mojo calls. WebView2Mac's embedded WebView uses this class to manage render views.
2. **Only adds a debug/safety check macro**: ADVANCED_MEMORY_SAFETY_CHECKS() is a compile-time macro that typically has no runtime overhead in Release builds (or only minimal performance impact). It does not change any functional logic, interface, or behavior of the class.
3. **Risk-free integration**: The change is extremely simple, adding only one include and one macro declaration, and will not conflict with any Edge-specific modifications.
4. **Indicates potential upstream memory safety issue**: The macro addition accompanies bug 496217775, suggesting upstream developers are investigating a potential use-after-free or similar memory safety issue in RenderWidgetHostNSViewBridge. This has indirect reference value for WebView2Mac — if this class has a memory safety defect, WebView2Mac could be equally affected.
1. **RenderWidgetHostNSViewBridge is a key class for WebView2Mac**: This class is the bridge in the Remote Cocoa architecture connecting RenderWidgetHostViewCocoa (app shim process) and RenderWidgetHostViewMac (browser process), responsible for forwarding rendering-related mojo calls. WebView2Mac's embedded WebView uses this class to manage render views.
2. **Only adds a debug/safety check macro**: ADVANCED_MEMORY_SAFETY_CHECKS() is a compile-time macro that typically has no runtime overhead in Release builds (or only minimal performance impact). It does not change any functional logic, interface, or behavior of the class.
3. **Risk-free integration**: The change is extremely simple, adding only one include and one macro declaration, and will not conflict with any Edge-specific modifications.
4. **Indicates potential upstream memory safety issue**: The macro addition accompanies bug 496217775, suggesting upstream developers are investigating a potential use-after-free or similar memory safety issue in RenderWidgetHostNSViewBridge. This has indirect reference value for WebView2Mac — if this class has a memory safety defect, WebView2Mac could be equally affected.
Impacted Classes:
remote_cocoa::RenderWidgetHostNSViewBridge