Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application #80907

Closed
Closed
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application#80907
Assignees
ivanpovazan
Labels
area-NativeAOT-coreclros-iosApple iOS
Milestone
8.0.0

Description

@ivanpovazan
ivanpovazan
opened on Jan 20, 2023

Description

Investigate potential issues and limitations of NativeAOT with .NET MAUI iOS applications:

  1. .NET MAUI template app
  2. .NET MAUI Podcast app

Goals

  • Document discovered findings and limitations
  • Based on the results propose the follow-up work
  • Measure performance of NativeAOT targeting iOS platforms, and compare results against MonoAOT, the measurements should include: the application size: disk size (SOD) and bundle size (.ipa), build and startup time

Preview 6

Our main focus for the initial releases is the application size.
Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview6 release

.NET MAUI template app

Building a .NET MAUI iOS sample application dotnet new maui gives the following results:

.NET MAUI ios appMono-p6NAOT-p6diff (%)
SOD (Mb)40,2450,1325%
.ipa (Mb)14,6816,5913%

Mono-p6 in the table represents results obtained with Mono .NET8 preview6, while NAOT-p6 represents results obtained with NativeAOT .NET8 preview6

Identified issues that contribute to the size regression with NativeAOT are:

Estimated savings

  • Estimated savings in app sizes by applying optimizations for NativeAOT from Step1 to Step4

    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    SOD (Mb)40,2450,1341,9340,527,58TBD
    .ipa (Mb)14,6816,5913,4312,8510,23TBD

    NOTE: Results for StepN mean that all the previous steps Step1..N have been implemented

  • Estimated difference (%) in app sizes compared to Mono-p6 by applying optimizations for NativeAOT from Step1 to Step4

    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    diff SOD (%)NaN24,56%4,20%0,64%-31,46%TBD
    diff .ipa (%)NaN13,00%-8,53%-12,48%-30,32%TBD

    NOTE: Diffs in the table mean that if for example we implement Step1 and Step2, the .ipa size with NativeAOT will be 12,48% smaller compared to Mono

.NET MAUI Podcast app

Estimated savings

  • Preliminary data (only estimated for Step3 improvements with NativeAOT):

    .NET MAUI ios appMono-p6Step3diff (%)
    SOD (Mb)62,6743,59-30,45%
    .ipa (Mb)24,3717,43-28,47%

Preview 7

Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview7 release. The results show that NativeAOT generates ~30% smaller applications compared to Mono (as it has been estimated above).

.NET MAUI template app

MAUI ios appMono-p7NAOT-p7diff (%)
SOD (Mb)40,5227,41-32,37%
.ipa (Mb)14,8210,14-31,56%

.NET MAUI Podcast app

MAUI podcast appMono-p7NAOT-p7diff (%)
SOD (Mb)62,8142,18-32,84%
.ipa (Mb)24,4616,85-31,10%

Other findings

  • Fix Infinite recursion when generated code wrongly dispatches explicit interface calls
  • Objective-C interop and GC API support:
  • Support static registrar with NativeAOT:
  • Dynamic registrar with NativeAOT - [NOT A PROBLEM]
    • We did not detect any need to support dynamic registrar with NativeAOT so far - especially because NativeAOT does not seem to be required for inner-dev loop experience. Nevertheless, bellow are listed findings when dynamic registrar is enabled for NativeAOT:
      • When building the application with dynamic registrar, the application crashes when ObjC runtime tries to register UIKit.UIGestureRecognizer+Callback`1 type while it is fetching its interface map against Foundation.INSObjectProtocol:
      default 12:06:26.833235+0200 HelloMauiiOS *** Terminating app due to uncaught exception 'System.ArgumentException', reason: 'Interface not found. (System.ArgumentException)
at Internal.Reflection.Execution.ExecutionEnvironmentImplementation.VerifyInterfaceIsImplemented(RuntimeTypeHandle, RuntimeTypeHandle) + 0x78
at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.GetInterfaceMap(Type) + 0xa8
at Registrar.SharedDynamic.PrepareInterfaceMethodMapping(Type) + 0x114
at Registrar.Registrar.RegisterTypeUnsafe(Type, List`1&) + 0x1fbc
at Registrar.Registrar.RegisterType(Type, List`1&) + 0x44
at Registrar.DynamicRegistrar.Register(Type) + 0x18
at ObjCRuntime.Class.GetClassHandle(Type, Boolean, Boolean&) + 0x168
at Foundation.NSObject.AllocIfNeeded() + 0x40
at UIKit.UIPanGestureRecognizer..ctor(Action`1) + 0x40
at Microsoft.Maui.Controls.Platform.Compatibility.ShellFlyoutRenderer.Microsoft.Maui.Controls.Platform.Compatibility.IShellFlyoutRenderer.AttachFlyout(IShellContext context, UIViewController content) + 0xf8

Metadata

Metadata

Assignees

Labels

area-NativeAOT-coreclros-iosApple iOS

Type

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  • AppModel
    Status
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Issue actions

, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application #80907
Closed
Closed
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application#80907
Assignees
ivanpovazan
Labels
area-NativeAOT-coreclros-iosApple iOS
Milestone
8.0.0
Description
@ivanpovazan
ivanpovazan
opened on Jan 20, 2023
Description
Investigate potential issues and limitations of NativeAOT with .NET MAUI iOS applications:
  1. .NET MAUI template app
  2. .NET MAUI Podcast app
Goals
  • Document discovered findings and limitations
  • Based on the results propose the follow-up work
  • Measure performance of NativeAOT targeting iOS platforms, and compare results against MonoAOT, the measurements should include: the application size: disk size (SOD) and bundle size (.ipa), build and startup time
Preview 6
Our main focus for the initial releases is the application size.

Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview6 release
.NET MAUI template app
Building a .NET MAUI iOS sample application dotnet new maui gives the following results:
.NET MAUI ios appMono-p6NAOT-p6diff (%)
SOD (Mb)40,2450,1325%
.ipa (Mb)14,6816,5913%
Mono-p6 in the table represents results obtained with Mono .NET8 preview6, while NAOT-p6 represents results obtained with NativeAOT .NET8 preview6
Identified issues that contribute to the size regression with NativeAOT are:
Estimated savings
  • Estimated savings in app sizes by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    SOD (Mb)40,2450,1341,9340,527,58TBD
    .ipa (Mb)14,6816,5913,4312,8510,23TBD
    NOTE: Results for StepN mean that all the previous steps Step1..N have been implemented
  • Estimated difference (%) in app sizes compared to Mono-p6 by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    diff SOD (%)NaN24,56%4,20%0,64%-31,46%TBD
    diff .ipa (%)NaN13,00%-8,53%-12,48%-30,32%TBD
    NOTE: Diffs in the table mean that if for example we implement Step1 and Step2, the .ipa size with NativeAOT will be 12,48% smaller compared to Mono
.NET MAUI Podcast app
Estimated savings
  • Preliminary data (only estimated for Step3 improvements with NativeAOT):
    .NET MAUI ios appMono-p6Step3diff (%)
    SOD (Mb)62,6743,59-30,45%
    .ipa (Mb)24,3717,43-28,47%
Preview 7
Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview7 release. The results show that NativeAOT generates ~30% smaller applications compared to Mono (as it has been estimated above).
.NET MAUI template app
MAUI ios appMono-p7NAOT-p7diff (%)
SOD (Mb)40,5227,41-32,37%
.ipa (Mb)14,8210,14-31,56%
.NET MAUI Podcast app
MAUI podcast appMono-p7NAOT-p7diff (%)
SOD (Mb)62,8142,18-32,84%
.ipa (Mb)24,4616,85-31,10%
Other findings
  • Fix Infinite recursion when generated code wrongly dispatches explicit interface calls
  • Objective-C interop and GC API support:

  • Support static registrar with NativeAOT:

  • Dynamic registrar with NativeAOT - [NOT A PROBLEM]

    •  We did not detect any need to support dynamic registrar with NativeAOT so far - especially because NativeAOT does not seem to be required for inner-dev loop experience. Nevertheless, bellow are listed findings when dynamic registrar is enabled for NativeAOT:

      • When building the application with dynamic registrar, the application crashes when ObjC runtime tries to register UIKit.UIGestureRecognizer+Callback`1 type while it is fetching its interface map against Foundation.INSObjectProtocol:
      default 12:06:26.833235+0200 HelloMauiiOS *** Terminating app due to uncaught exception 'System.ArgumentException', reason: 'Interface not found. (System.ArgumentException)
at Internal.Reflection.Execution.ExecutionEnvironmentImplementation.VerifyInterfaceIsImplemented(RuntimeTypeHandle, RuntimeTypeHandle) + 0x78
at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.GetInterfaceMap(Type) + 0xa8
at Registrar.SharedDynamic.PrepareInterfaceMethodMapping(Type) + 0x114
at Registrar.Registrar.RegisterTypeUnsafe(Type, List`1&) + 0x1fbc
at Registrar.Registrar.RegisterType(Type, List`1&) + 0x44
at Registrar.DynamicRegistrar.Register(Type) + 0x18
at ObjCRuntime.Class.GetClassHandle(Type, Boolean, Boolean&) + 0x168
at Foundation.NSObject.AllocIfNeeded() + 0x40
at UIKit.UIPanGestureRecognizer..ctor(Action`1) + 0x40
at Microsoft.Maui.Controls.Platform.Compatibility.ShellFlyoutRenderer.Microsoft.Maui.Controls.Platform.Compatibility.IShellFlyoutRenderer.AttachFlyout(IShellContext context, UIViewController content) + 0xf8

Metadata
Metadata
Assignees
Labels
area-NativeAOT-coreclros-iosApple iOS
Type
No type
Projects
  • AppModel
    Status
    No status
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Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application #80907
Closed
Closed
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application#80907
Assignees
ivanpovazan
Labels
area-NativeAOT-coreclros-iosApple iOS
Milestone
8.0.0
Description
@ivanpovazan
ivanpovazan
opened on Jan 20, 2023
Description
Investigate potential issues and limitations of NativeAOT with .NET MAUI iOS applications:
  1. .NET MAUI template app
  2. .NET MAUI Podcast app
Goals
  • Document discovered findings and limitations
  • Based on the results propose the follow-up work
  • Measure performance of NativeAOT targeting iOS platforms, and compare results against MonoAOT, the measurements should include: the application size: disk size (SOD) and bundle size (.ipa), build and startup time
Preview 6
Our main focus for the initial releases is the application size.

Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview6 release
.NET MAUI template app
Building a .NET MAUI iOS sample application dotnet new maui gives the following results:
.NET MAUI ios appMono-p6NAOT-p6diff (%)
SOD (Mb)40,2450,1325%
.ipa (Mb)14,6816,5913%
Mono-p6 in the table represents results obtained with Mono .NET8 preview6, while NAOT-p6 represents results obtained with NativeAOT .NET8 preview6
Identified issues that contribute to the size regression with NativeAOT are:
Estimated savings
  • Estimated savings in app sizes by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    SOD (Mb)40,2450,1341,9340,527,58TBD
    .ipa (Mb)14,6816,5913,4312,8510,23TBD
    NOTE: Results for StepN mean that all the previous steps Step1..N have been implemented
  • Estimated difference (%) in app sizes compared to Mono-p6 by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    diff SOD (%)NaN24,56%4,20%0,64%-31,46%TBD
    diff .ipa (%)NaN13,00%-8,53%-12,48%-30,32%TBD
    NOTE: Diffs in the table mean that if for example we implement Step1 and Step2, the .ipa size with NativeAOT will be 12,48% smaller compared to Mono
.NET MAUI Podcast app
Estimated savings
  • Preliminary data (only estimated for Step3 improvements with NativeAOT):
    .NET MAUI ios appMono-p6Step3diff (%)
    SOD (Mb)62,6743,59-30,45%
    .ipa (Mb)24,3717,43-28,47%
Preview 7
Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview7 release. The results show that NativeAOT generates ~30% smaller applications compared to Mono (as it has been estimated above).
.NET MAUI template app
MAUI ios appMono-p7NAOT-p7diff (%)
SOD (Mb)40,5227,41-32,37%
.ipa (Mb)14,8210,14-31,56%
.NET MAUI Podcast app
MAUI podcast appMono-p7NAOT-p7diff (%)
SOD (Mb)62,8142,18-32,84%
.ipa (Mb)24,4616,85-31,10%
Other findings
  • Fix Infinite recursion when generated code wrongly dispatches explicit interface calls
  • Objective-C interop and GC API support:

  • Support static registrar with NativeAOT:

  • Dynamic registrar with NativeAOT - [NOT A PROBLEM]

    •  We did not detect any need to support dynamic registrar with NativeAOT so far - especially because NativeAOT does not seem to be required for inner-dev loop experience. Nevertheless, bellow are listed findings when dynamic registrar is enabled for NativeAOT:

      • When building the application with dynamic registrar, the application crashes when ObjC runtime tries to register UIKit.UIGestureRecognizer+Callback`1 type while it is fetching its interface map against Foundation.INSObjectProtocol:
      default 12:06:26.833235+0200 HelloMauiiOS *** Terminating app due to uncaught exception 'System.ArgumentException', reason: 'Interface not found. (System.ArgumentException)
at Internal.Reflection.Execution.ExecutionEnvironmentImplementation.VerifyInterfaceIsImplemented(RuntimeTypeHandle, RuntimeTypeHandle) + 0x78
at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.GetInterfaceMap(Type) + 0xa8
at Registrar.SharedDynamic.PrepareInterfaceMethodMapping(Type) + 0x114
at Registrar.Registrar.RegisterTypeUnsafe(Type, List`1&) + 0x1fbc
at Registrar.Registrar.RegisterType(Type, List`1&) + 0x44
at Registrar.DynamicRegistrar.Register(Type) + 0x18
at ObjCRuntime.Class.GetClassHandle(Type, Boolean, Boolean&) + 0x168
at Foundation.NSObject.AllocIfNeeded() + 0x40
at UIKit.UIPanGestureRecognizer..ctor(Action`1) + 0x40
at Microsoft.Maui.Controls.Platform.Compatibility.ShellFlyoutRenderer.Microsoft.Maui.Controls.Platform.Compatibility.IShellFlyoutRenderer.AttachFlyout(IShellContext context, UIViewController content) + 0xf8

Metadata
Metadata
Assignees
Labels
area-NativeAOT-coreclros-iosApple iOS
Type
No type
Projects
  • AppModel
    Status
    No status
Milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application #80907
Closed
Closed
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application#80907
Assignees
ivanpovazan
Labels
area-NativeAOT-coreclros-iosApple iOS
Milestone
8.0.0
Description
@ivanpovazan
ivanpovazan
opened on Jan 20, 2023
Description
Investigate potential issues and limitations of NativeAOT with .NET MAUI iOS applications:
  1. .NET MAUI template app
  2. .NET MAUI Podcast app
Goals
  • Document discovered findings and limitations
  • Based on the results propose the follow-up work
  • Measure performance of NativeAOT targeting iOS platforms, and compare results against MonoAOT, the measurements should include: the application size: disk size (SOD) and bundle size (.ipa), build and startup time
Preview 6
Our main focus for the initial releases is the application size.

Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview6 release
.NET MAUI template app
Building a .NET MAUI iOS sample application dotnet new maui gives the following results:
.NET MAUI ios appMono-p6NAOT-p6diff (%)
SOD (Mb)40,2450,1325%
.ipa (Mb)14,6816,5913%
Mono-p6 in the table represents results obtained with Mono .NET8 preview6, while NAOT-p6 represents results obtained with NativeAOT .NET8 preview6
Identified issues that contribute to the size regression with NativeAOT are:
Estimated savings
  • Estimated savings in app sizes by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    SOD (Mb)40,2450,1341,9340,527,58TBD
    .ipa (Mb)14,6816,5913,4312,8510,23TBD
    NOTE: Results for StepN mean that all the previous steps Step1..N have been implemented
  • Estimated difference (%) in app sizes compared to Mono-p6 by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    diff SOD (%)NaN24,56%4,20%0,64%-31,46%TBD
    diff .ipa (%)NaN13,00%-8,53%-12,48%-30,32%TBD
    NOTE: Diffs in the table mean that if for example we implement Step1 and Step2, the .ipa size with NativeAOT will be 12,48% smaller compared to Mono
.NET MAUI Podcast app
Estimated savings
  • Preliminary data (only estimated for Step3 improvements with NativeAOT):
    .NET MAUI ios appMono-p6Step3diff (%)
    SOD (Mb)62,6743,59-30,45%
    .ipa (Mb)24,3717,43-28,47%
Preview 7
Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview7 release. The results show that NativeAOT generates ~30% smaller applications compared to Mono (as it has been estimated above).
.NET MAUI template app
MAUI ios appMono-p7NAOT-p7diff (%)
SOD (Mb)40,5227,41-32,37%
.ipa (Mb)14,8210,14-31,56%
.NET MAUI Podcast app
MAUI podcast appMono-p7NAOT-p7diff (%)
SOD (Mb)62,8142,18-32,84%
.ipa (Mb)24,4616,85-31,10%
Other findings
  • Fix Infinite recursion when generated code wrongly dispatches explicit interface calls
  • Objective-C interop and GC API support:

  • Support static registrar with NativeAOT:

  • Dynamic registrar with NativeAOT - [NOT A PROBLEM]

    •  We did not detect any need to support dynamic registrar with NativeAOT so far - especially because NativeAOT does not seem to be required for inner-dev loop experience. Nevertheless, bellow are listed findings when dynamic registrar is enabled for NativeAOT:

      • When building the application with dynamic registrar, the application crashes when ObjC runtime tries to register UIKit.UIGestureRecognizer+Callback`1 type while it is fetching its interface map against Foundation.INSObjectProtocol:
      default 12:06:26.833235+0200 HelloMauiiOS *** Terminating app due to uncaught exception 'System.ArgumentException', reason: 'Interface not found. (System.ArgumentException)
at Internal.Reflection.Execution.ExecutionEnvironmentImplementation.VerifyInterfaceIsImplemented(RuntimeTypeHandle, RuntimeTypeHandle) + 0x78
at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.GetInterfaceMap(Type) + 0xa8
at Registrar.SharedDynamic.PrepareInterfaceMethodMapping(Type) + 0x114
at Registrar.Registrar.RegisterTypeUnsafe(Type, List`1&) + 0x1fbc
at Registrar.Registrar.RegisterType(Type, List`1&) + 0x44
at Registrar.DynamicRegistrar.Register(Type) + 0x18
at ObjCRuntime.Class.GetClassHandle(Type, Boolean, Boolean&) + 0x168
at Foundation.NSObject.AllocIfNeeded() + 0x40
at UIKit.UIPanGestureRecognizer..ctor(Action`1) + 0x40
at Microsoft.Maui.Controls.Platform.Compatibility.ShellFlyoutRenderer.Microsoft.Maui.Controls.Platform.Compatibility.IShellFlyoutRenderer.AttachFlyout(IShellContext context, UIViewController content) + 0xf8

Metadata
Metadata
Assignees
Labels
area-NativeAOT-coreclros-iosApple iOS
Type
No type
Projects
  • AppModel
    Status
    No status
Milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application #80907
Closed
Closed
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application#80907
Assignees
ivanpovazan
Labels
area-NativeAOT-coreclros-iosApple iOS
Milestone
8.0.0
Description
@ivanpovazan
ivanpovazan
opened on Jan 20, 2023
Description
Investigate potential issues and limitations of NativeAOT with .NET MAUI iOS applications:
  1. .NET MAUI template app
  2. .NET MAUI Podcast app
Goals
  • Document discovered findings and limitations
  • Based on the results propose the follow-up work
  • Measure performance of NativeAOT targeting iOS platforms, and compare results against MonoAOT, the measurements should include: the application size: disk size (SOD) and bundle size (.ipa), build and startup time
Preview 6
Our main focus for the initial releases is the application size.

Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview6 release
.NET MAUI template app
Building a .NET MAUI iOS sample application dotnet new maui gives the following results:
.NET MAUI ios appMono-p6NAOT-p6diff (%)
SOD (Mb)40,2450,1325%
.ipa (Mb)14,6816,5913%
Mono-p6 in the table represents results obtained with Mono .NET8 preview6, while NAOT-p6 represents results obtained with NativeAOT .NET8 preview6
Identified issues that contribute to the size regression with NativeAOT are:
Estimated savings
  • Estimated savings in app sizes by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    SOD (Mb)40,2450,1341,9340,527,58TBD
    .ipa (Mb)14,6816,5913,4312,8510,23TBD
    NOTE: Results for StepN mean that all the previous steps Step1..N have been implemented
  • Estimated difference (%) in app sizes compared to Mono-p6 by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    diff SOD (%)NaN24,56%4,20%0,64%-31,46%TBD
    diff .ipa (%)NaN13,00%-8,53%-12,48%-30,32%TBD
    NOTE: Diffs in the table mean that if for example we implement Step1 and Step2, the .ipa size with NativeAOT will be 12,48% smaller compared to Mono
.NET MAUI Podcast app
Estimated savings
  • Preliminary data (only estimated for Step3 improvements with NativeAOT):
    .NET MAUI ios appMono-p6Step3diff (%)
    SOD (Mb)62,6743,59-30,45%
    .ipa (Mb)24,3717,43-28,47%
Preview 7
Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview7 release. The results show that NativeAOT generates ~30% smaller applications compared to Mono (as it has been estimated above).
.NET MAUI template app
MAUI ios appMono-p7NAOT-p7diff (%)
SOD (Mb)40,5227,41-32,37%
.ipa (Mb)14,8210,14-31,56%
.NET MAUI Podcast app
MAUI podcast appMono-p7NAOT-p7diff (%)
SOD (Mb)62,8142,18-32,84%
.ipa (Mb)24,4616,85-31,10%
Other findings
  • Fix Infinite recursion when generated code wrongly dispatches explicit interface calls
  • Objective-C interop and GC API support:

  • Support static registrar with NativeAOT:

  • Dynamic registrar with NativeAOT - [NOT A PROBLEM]

    •  We did not detect any need to support dynamic registrar with NativeAOT so far - especially because NativeAOT does not seem to be required for inner-dev loop experience. Nevertheless, bellow are listed findings when dynamic registrar is enabled for NativeAOT:

      • When building the application with dynamic registrar, the application crashes when ObjC runtime tries to register UIKit.UIGestureRecognizer+Callback`1 type while it is fetching its interface map against Foundation.INSObjectProtocol:
      default 12:06:26.833235+0200 HelloMauiiOS *** Terminating app due to uncaught exception 'System.ArgumentException', reason: 'Interface not found. (System.ArgumentException)
at Internal.Reflection.Execution.ExecutionEnvironmentImplementation.VerifyInterfaceIsImplemented(RuntimeTypeHandle, RuntimeTypeHandle) + 0x78
at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.GetInterfaceMap(Type) + 0xa8
at Registrar.SharedDynamic.PrepareInterfaceMethodMapping(Type) + 0x114
at Registrar.Registrar.RegisterTypeUnsafe(Type, List`1&) + 0x1fbc
at Registrar.Registrar.RegisterType(Type, List`1&) + 0x44
at Registrar.DynamicRegistrar.Register(Type) + 0x18
at ObjCRuntime.Class.GetClassHandle(Type, Boolean, Boolean&) + 0x168
at Foundation.NSObject.AllocIfNeeded() + 0x40
at UIKit.UIPanGestureRecognizer..ctor(Action`1) + 0x40
at Microsoft.Maui.Controls.Platform.Compatibility.ShellFlyoutRenderer.Microsoft.Maui.Controls.Platform.Compatibility.IShellFlyoutRenderer.AttachFlyout(IShellContext context, UIViewController content) + 0xf8

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area-NativeAOT-coreclros-iosApple iOS
Type
No type
Projects
  • AppModel
    Status
    No status
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Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application #80907
Closed
Closed
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application#80907
Assignees
ivanpovazan
Labels
area-NativeAOT-coreclros-iosApple iOS
Milestone
8.0.0
Description
@ivanpovazan
ivanpovazan
opened on Jan 20, 2023
Description
Investigate potential issues and limitations of NativeAOT with .NET MAUI iOS applications:
  1. .NET MAUI template app
  2. .NET MAUI Podcast app
Goals
  • Document discovered findings and limitations
  • Based on the results propose the follow-up work
  • Measure performance of NativeAOT targeting iOS platforms, and compare results against MonoAOT, the measurements should include: the application size: disk size (SOD) and bundle size (.ipa), build and startup time
Preview 6
Our main focus for the initial releases is the application size.

Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview6 release
.NET MAUI template app
Building a .NET MAUI iOS sample application dotnet new maui gives the following results:
.NET MAUI ios appMono-p6NAOT-p6diff (%)
SOD (Mb)40,2450,1325%
.ipa (Mb)14,6816,5913%
Mono-p6 in the table represents results obtained with Mono .NET8 preview6, while NAOT-p6 represents results obtained with NativeAOT .NET8 preview6
Identified issues that contribute to the size regression with NativeAOT are:
Estimated savings
  • Estimated savings in app sizes by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    SOD (Mb)40,2450,1341,9340,527,58TBD
    .ipa (Mb)14,6816,5913,4312,8510,23TBD
    NOTE: Results for StepN mean that all the previous steps Step1..N have been implemented
  • Estimated difference (%) in app sizes compared to Mono-p6 by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    diff SOD (%)NaN24,56%4,20%0,64%-31,46%TBD
    diff .ipa (%)NaN13,00%-8,53%-12,48%-30,32%TBD
    NOTE: Diffs in the table mean that if for example we implement Step1 and Step2, the .ipa size with NativeAOT will be 12,48% smaller compared to Mono
.NET MAUI Podcast app
Estimated savings
  • Preliminary data (only estimated for Step3 improvements with NativeAOT):
    .NET MAUI ios appMono-p6Step3diff (%)
    SOD (Mb)62,6743,59-30,45%
    .ipa (Mb)24,3717,43-28,47%
Preview 7
Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview7 release. The results show that NativeAOT generates ~30% smaller applications compared to Mono (as it has been estimated above).
.NET MAUI template app
MAUI ios appMono-p7NAOT-p7diff (%)
SOD (Mb)40,5227,41-32,37%
.ipa (Mb)14,8210,14-31,56%
.NET MAUI Podcast app
MAUI podcast appMono-p7NAOT-p7diff (%)
SOD (Mb)62,8142,18-32,84%
.ipa (Mb)24,4616,85-31,10%
Other findings
  • Fix Infinite recursion when generated code wrongly dispatches explicit interface calls
  • Objective-C interop and GC API support:

  • Support static registrar with NativeAOT:

  • Dynamic registrar with NativeAOT - [NOT A PROBLEM]

    •  We did not detect any need to support dynamic registrar with NativeAOT so far - especially because NativeAOT does not seem to be required for inner-dev loop experience. Nevertheless, bellow are listed findings when dynamic registrar is enabled for NativeAOT:

      • When building the application with dynamic registrar, the application crashes when ObjC runtime tries to register UIKit.UIGestureRecognizer+Callback`1 type while it is fetching its interface map against Foundation.INSObjectProtocol:
      default 12:06:26.833235+0200 HelloMauiiOS *** Terminating app due to uncaught exception 'System.ArgumentException', reason: 'Interface not found. (System.ArgumentException)
at Internal.Reflection.Execution.ExecutionEnvironmentImplementation.VerifyInterfaceIsImplemented(RuntimeTypeHandle, RuntimeTypeHandle) + 0x78
at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.GetInterfaceMap(Type) + 0xa8
at Registrar.SharedDynamic.PrepareInterfaceMethodMapping(Type) + 0x114
at Registrar.Registrar.RegisterTypeUnsafe(Type, List`1&) + 0x1fbc
at Registrar.Registrar.RegisterType(Type, List`1&) + 0x44
at Registrar.DynamicRegistrar.Register(Type) + 0x18
at ObjCRuntime.Class.GetClassHandle(Type, Boolean, Boolean&) + 0x168
at Foundation.NSObject.AllocIfNeeded() + 0x40
at UIKit.UIPanGestureRecognizer..ctor(Action`1) + 0x40
at Microsoft.Maui.Controls.Platform.Compatibility.ShellFlyoutRenderer.Microsoft.Maui.Controls.Platform.Compatibility.IShellFlyoutRenderer.AttachFlyout(IShellContext context, UIViewController content) + 0xf8

Metadata
Metadata
Assignees
Labels
area-NativeAOT-coreclros-iosApple iOS
Type
No type
Projects
  • AppModel
    Status
    No status
Milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application #80907
Closed
Closed
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application#80907
Assignees
ivanpovazan
Labels
area-NativeAOT-coreclros-iosApple iOS
Milestone
8.0.0
Description
@ivanpovazan
ivanpovazan
opened on Jan 20, 2023
Description
Investigate potential issues and limitations of NativeAOT with .NET MAUI iOS applications:
  1. .NET MAUI template app
  2. .NET MAUI Podcast app
Goals
  • Document discovered findings and limitations
  • Based on the results propose the follow-up work
  • Measure performance of NativeAOT targeting iOS platforms, and compare results against MonoAOT, the measurements should include: the application size: disk size (SOD) and bundle size (.ipa), build and startup time
Preview 6
Our main focus for the initial releases is the application size.

Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview6 release
.NET MAUI template app
Building a .NET MAUI iOS sample application dotnet new maui gives the following results:
.NET MAUI ios appMono-p6NAOT-p6diff (%)
SOD (Mb)40,2450,1325%
.ipa (Mb)14,6816,5913%
Mono-p6 in the table represents results obtained with Mono .NET8 preview6, while NAOT-p6 represents results obtained with NativeAOT .NET8 preview6
Identified issues that contribute to the size regression with NativeAOT are:
Estimated savings
  • Estimated savings in app sizes by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    SOD (Mb)40,2450,1341,9340,527,58TBD
    .ipa (Mb)14,6816,5913,4312,8510,23TBD
    NOTE: Results for StepN mean that all the previous steps Step1..N have been implemented
  • Estimated difference (%) in app sizes compared to Mono-p6 by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    diff SOD (%)NaN24,56%4,20%0,64%-31,46%TBD
    diff .ipa (%)NaN13,00%-8,53%-12,48%-30,32%TBD
    NOTE: Diffs in the table mean that if for example we implement Step1 and Step2, the .ipa size with NativeAOT will be 12,48% smaller compared to Mono
.NET MAUI Podcast app
Estimated savings
  • Preliminary data (only estimated for Step3 improvements with NativeAOT):
    .NET MAUI ios appMono-p6Step3diff (%)
    SOD (Mb)62,6743,59-30,45%
    .ipa (Mb)24,3717,43-28,47%
Preview 7
Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview7 release. The results show that NativeAOT generates ~30% smaller applications compared to Mono (as it has been estimated above).
.NET MAUI template app
MAUI ios appMono-p7NAOT-p7diff (%)
SOD (Mb)40,5227,41-32,37%
.ipa (Mb)14,8210,14-31,56%
.NET MAUI Podcast app
MAUI podcast appMono-p7NAOT-p7diff (%)
SOD (Mb)62,8142,18-32,84%
.ipa (Mb)24,4616,85-31,10%
Other findings
  • Fix Infinite recursion when generated code wrongly dispatches explicit interface calls
  • Objective-C interop and GC API support:

  • Support static registrar with NativeAOT:

  • Dynamic registrar with NativeAOT - [NOT A PROBLEM]

    •  We did not detect any need to support dynamic registrar with NativeAOT so far - especially because NativeAOT does not seem to be required for inner-dev loop experience. Nevertheless, bellow are listed findings when dynamic registrar is enabled for NativeAOT:

      • When building the application with dynamic registrar, the application crashes when ObjC runtime tries to register UIKit.UIGestureRecognizer+Callback`1 type while it is fetching its interface map against Foundation.INSObjectProtocol:
      default 12:06:26.833235+0200 HelloMauiiOS *** Terminating app due to uncaught exception 'System.ArgumentException', reason: 'Interface not found. (System.ArgumentException)
at Internal.Reflection.Execution.ExecutionEnvironmentImplementation.VerifyInterfaceIsImplemented(RuntimeTypeHandle, RuntimeTypeHandle) + 0x78
at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.GetInterfaceMap(Type) + 0xa8
at Registrar.SharedDynamic.PrepareInterfaceMethodMapping(Type) + 0x114
at Registrar.Registrar.RegisterTypeUnsafe(Type, List`1&) + 0x1fbc
at Registrar.Registrar.RegisterType(Type, List`1&) + 0x44
at Registrar.DynamicRegistrar.Register(Type) + 0x18
at ObjCRuntime.Class.GetClassHandle(Type, Boolean, Boolean&) + 0x168
at Foundation.NSObject.AllocIfNeeded() + 0x40
at UIKit.UIPanGestureRecognizer..ctor(Action`1) + 0x40
at Microsoft.Maui.Controls.Platform.Compatibility.ShellFlyoutRenderer.Microsoft.Maui.Controls.Platform.Compatibility.IShellFlyoutRenderer.AttachFlyout(IShellContext context, UIViewController content) + 0xf8

Metadata
Metadata
Assignees
Labels
area-NativeAOT-coreclros-iosApple iOS
Type
No type
Projects
  • AppModel
    Status
    No status
Milestone
Relationships
None yet
Development
No branches or pull requests
Issue actions

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application #80907
Closed
Closed
Investigate limitations and document findings of enabling NativeAOT for MAUI iOS application#80907
Assignees
ivanpovazan
Labels
area-NativeAOT-coreclros-iosApple iOS
Milestone
8.0.0
Description
@ivanpovazan
ivanpovazan
opened on Jan 20, 2023
Description
Investigate potential issues and limitations of NativeAOT with .NET MAUI iOS applications:
  1. .NET MAUI template app
  2. .NET MAUI Podcast app
Goals
  • Document discovered findings and limitations
  • Based on the results propose the follow-up work
  • Measure performance of NativeAOT targeting iOS platforms, and compare results against MonoAOT, the measurements should include: the application size: disk size (SOD) and bundle size (.ipa), build and startup time
Preview 6
Our main focus for the initial releases is the application size.

Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview6 release
.NET MAUI template app
Building a .NET MAUI iOS sample application dotnet new maui gives the following results:
.NET MAUI ios appMono-p6NAOT-p6diff (%)
SOD (Mb)40,2450,1325%
.ipa (Mb)14,6816,5913%
Mono-p6 in the table represents results obtained with Mono .NET8 preview6, while NAOT-p6 represents results obtained with NativeAOT .NET8 preview6
Identified issues that contribute to the size regression with NativeAOT are:
Estimated savings
  • Estimated savings in app sizes by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    SOD (Mb)40,2450,1341,9340,527,58TBD
    .ipa (Mb)14,6816,5913,4312,8510,23TBD
    NOTE: Results for StepN mean that all the previous steps Step1..N have been implemented
  • Estimated difference (%) in app sizes compared to Mono-p6 by applying optimizations for NativeAOT from Step1 to Step4
    .NET MAUI ios appMono-p6NAOT-p6Step1Step2Step3Step4
    diff SOD (%)NaN24,56%4,20%0,64%-31,46%TBD
    diff .ipa (%)NaN13,00%-8,53%-12,48%-30,32%TBD
    NOTE: Diffs in the table mean that if for example we implement Step1 and Step2, the .ipa size with NativeAOT will be 12,48% smaller compared to Mono
.NET MAUI Podcast app
Estimated savings
  • Preliminary data (only estimated for Step3 improvements with NativeAOT):
    .NET MAUI ios appMono-p6Step3diff (%)
    SOD (Mb)62,6743,59-30,45%
    .ipa (Mb)24,3717,43-28,47%
Preview 7
Apps were built and measured using: https://github.com/xamarin/xamarin-macios/tree/release/8.0.1xx-preview7 release. The results show that NativeAOT generates ~30% smaller applications compared to Mono (as it has been estimated above).
.NET MAUI template app
MAUI ios appMono-p7NAOT-p7diff (%)
SOD (Mb)40,5227,41-32,37%
.ipa (Mb)14,8210,14-31,56%
.NET MAUI Podcast app
MAUI podcast appMono-p7NAOT-p7diff (%)
SOD (Mb)62,8142,18-32,84%
.ipa (Mb)24,4616,85-31,10%
Other findings
  • Fix Infinite recursion when generated code wrongly dispatches explicit interface calls
  • Objective-C interop and GC API support:

  • Support static registrar with NativeAOT:

  • Dynamic registrar with NativeAOT - [NOT A PROBLEM]

    •  We did not detect any need to support dynamic registrar with NativeAOT so far - especially because NativeAOT does not seem to be required for inner-dev loop experience. Nevertheless, bellow are listed findings when dynamic registrar is enabled for NativeAOT:

      • When building the application with dynamic registrar, the application crashes when ObjC runtime tries to register UIKit.UIGestureRecognizer+Callback`1 type while it is fetching its interface map against Foundation.INSObjectProtocol:
      default 12:06:26.833235+0200 HelloMauiiOS *** Terminating app due to uncaught exception 'System.ArgumentException', reason: 'Interface not found. (System.ArgumentException)
at Internal.Reflection.Execution.ExecutionEnvironmentImplementation.VerifyInterfaceIsImplemented(RuntimeTypeHandle, RuntimeTypeHandle) + 0x78
at System.Reflection.Runtime.TypeInfos.RuntimeTypeInfo.GetInterfaceMap(Type) + 0xa8
at Registrar.SharedDynamic.PrepareInterfaceMethodMapping(Type) + 0x114
at Registrar.Registrar.RegisterTypeUnsafe(Type, List`1&) + 0x1fbc
at Registrar.Registrar.RegisterType(Type, List`1&) + 0x44
at Registrar.DynamicRegistrar.Register(Type) + 0x18
at ObjCRuntime.Class.GetClassHandle(Type, Boolean, Boolean&) + 0x168
at Foundation.NSObject.AllocIfNeeded() + 0x40
at UIKit.UIPanGestureRecognizer..ctor(Action`1) + 0x40
at Microsoft.Maui.Controls.Platform.Compatibility.ShellFlyoutRenderer.Microsoft.Maui.Controls.Platform.Compatibility.IShellFlyoutRenderer.AttachFlyout(IShellContext context, UIViewController content) + 0xf8

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