[NativeAOT-LLVM] Merge to Sep 24

.config/dotnet-tools.json

@@ -15,7 +15,7 @@
       ]
     },
     "microsoft.dotnet.xharness.cli": {
-      "version": "9.0.0-prerelease.24405.1",
+      "version": "10.0.0-prerelease.24466.1",
       "commands": [
         "xharness"
       ]

.github/workflows/inter-branch-merge-flow.yml

@@ -0,0 +1,13 @@
+name: Inter-branch merge workflow
+on:
+  push:
+    branches:
+      - release/**
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  Merge:
+    uses: dotnet/arcade/.github/workflows/inter-branch-merge-base.yml@main

.github/workflows/jit-format.yml

@@ -15,7 +15,7 @@ jobs:
         os:
           - name: linux
             image: ubuntu-latest
-            container: mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-cross-amd64-net9.0
+            container: mcr.microsoft.com/dotnet-buildtools/prereqs:azurelinux-3.0-net9.0-cross-amd64
             extension: '.sh'
             cross: '--cross'
             rootfs: '/crossrootfs/x64'

Directory.Build.props

@@ -485,6 +485,8 @@
   <PropertyGroup Condition="'$(IsTestProject)' == 'true' or '$(IsTestSupportProject)' == 'true' or '$(IsTrimmingTestProject)' == 'true'">
     <!-- we need to re-enable BinaryFormatter within test projects since some tests exercise these code paths to ensure compat -->
     <EnableUnsafeBinaryFormatterSerialization>true</EnableUnsafeBinaryFormatterSerialization>
+    <!-- For DotNetBuildSourceOnly, only the bundled BinaryFormatter is built which does not support serialization. -->
+    <EnableUnsafeBinaryFormatterSerialization Condition="'$(DotNetBuildSourceOnly)' == 'true'">false</EnableUnsafeBinaryFormatterSerialization>
     <!-- don't warn on usage of BinaryFormatter or legacy serialization infrastructure from test projects -->
     <NoWarn>$(NoWarn);SYSLIB0011;SYSLIB0050;SYSLIB0051</NoWarn>
     <!-- don't warn about unnecessary trim warning suppressions. can be removed with preview 6. -->

Directory.Build.targets

@@ -162,7 +162,7 @@
           AfterTargets="ResolveTargetingPackAssets">
     <ItemGroup>
       <_targetingPackReferenceExclusion Include="$(TargetName)" />
-      <_targetingPackReferenceExclusion Include="@(_ResolvedProjectReferencePaths->Metadata('Filename'))" />
+      <_targetingPackReferenceExclusionProjects Include="@(_ResolvedProjectReferencePaths->Metadata('Filename'))" />
       <_targetingPackReferenceExclusion Include="@(DefaultReferenceExclusion)" />
     </ItemGroup>
 
@@ -177,7 +177,7 @@
       <_targetingPackReferenceWithProjectName Include="@(Reference->WithMetadataValue('ExternallyResolved', 'true')->Metadata('Filename'))"
                                               OriginalIdentity="%(Identity)" />
       <_targetingPackIncludedReferenceWithProjectName Include="@(_targetingPackReferenceWithProjectName)"
-                                                      Exclude="@(_targetingPackReferenceExclusion)" />
+                                                      Exclude="@(_targetingPackReferenceExclusion);@(_targetingPackReferenceExclusionProjects->WithMetadataValue('ReferenceOutputAssembly', 'true'))" />
       <_targetingPackExcludedReferenceWithProjectName Include="@(_targetingPackReferenceWithProjectName)"
                                                       Exclude="@(_targetingPackIncludedReferenceWithProjectName)" />
       <Reference Remove="@(_targetingPackExcludedReferenceWithProjectName->Metadata('OriginalIdentity'))" />
@@ -187,7 +187,7 @@
       <_targetingPackAnalyzerReferenceWithProjectName Include="@(Analyzer->WithMetadataValue('ExternallyResolved', 'true')->Metadata('Filename'))"
                                                       OriginalIdentity="%(Identity)" />
       <_targetingPackIncludedAnalyzerReferenceWithProjectName Include="@(_targetingPackAnalyzerReferenceWithProjectName)"
-                                                              Exclude="@(_targetingPackReferenceExclusion)" />
+                                                              Exclude="@(_targetingPackReferenceExclusion);@(_targetingPackReferenceExclusionProjects->WithMetadataValue('OutputItemType', 'Analyzer'))" />
       <_targetingPackExcludedAnalyzerReferenceWithProjectName Include="@(_targetingPackAnalyzerReferenceWithProjectName)"
                                                               Exclude="@(_targetingPackIncludedAnalyzerReferenceWithProjectName)" />
       <Analyzer Remove="@(_targetingPackExcludedAnalyzerReferenceWithProjectName->Metadata('OriginalIdentity'))" />

NuGet.config

@@ -20,6 +20,8 @@
     <add key="dotnet-libraries-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet-libraries-transport/nuget/v3/index.json" />
     <add key="dotnet9" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9/nuget/v3/index.json" />
     <add key="dotnet9-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet9-transport/nuget/v3/index.json" />
+    <add key="dotnet10" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10/nuget/v3/index.json" />
+    <add key="dotnet10-transport" value="https://pkgs.dev.azure.com/dnceng/public/_packaging/dotnet10-transport/nuget/v3/index.json" />
   </packageSources>
   <disabledPackageSources>
     <clear />

THIRD-PARTY-NOTICES.TXT

@@ -69,19 +69,27 @@ written authorization of the copyright holder.
 License notice for zlib-ng
 -----------------------
 
-https://github.com/zlib-ng/zlib-ng/blob/develop/LICENSE.md
+https://github.com/zlib-ng/zlib-ng/blob/d54e3769be0c522015b784eca2af258b1c026107/LICENSE.md
 
 (C) 1995-2024 Jean-loup Gailly and Mark Adler
 
-This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software.
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
 
-Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions:
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
 
-The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
 
-Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
 
-This notice may not be removed or altered from any source distribution.
+3. This notice may not be removed or altered from any source distribution.
 
 License notice for LinuxTracepoints
 -----------------------------------

docs/area-owners.md

@@ -65,6 +65,7 @@ Note: Editing this file doesn't update the mapping used by `@msftbot` for area-s
 | area-Single-File                               | @agocke              | @vitek-karas @vsadov                                |                                                                                                                                                                                                                                                                                           |
 | area-Snap                                      | @MichaelSimons       | @NikolaMilosavljevic @leecow @MichaelSimons         |                                                                                                                                                                                                                                                                                           |
 | area-System.Buffers                            | @jeffhandley         | @dotnet/area-system-buffers                         |                                                                                                                                                                                                                                                                                           |
+| area-System.ClientModel                        | @terrajobst          | @dotnet/fxdc                                        | Bugs and feature requests should go to https://github.com/Azure/azure-sdk-for-net/issues. We don't own the code, but FXDC reviews changes to determine overlap with other `System` concepts. The Azure SDK team will post API updates in this repo for us to review.                      |
 | area-System.CodeDom                            | @ericstj             | @dotnet/area-system-codedom                         |                                                                                                                                                                                                                                                                                           |
 | area-System.Collections                        | @jeffhandley         | @dotnet/area-system-collections                     | Excluded:<ul><li>System.Array -> System.Runtime</li></ul>                                                                                                                                                                                                                                 |
 | area-System.ComponentModel                     | @ericstj             | @dotnet/area-system-componentmodel                  | Consultants: @dotnet/dotnet-winforms                                                                                                                                                                                                                                                      |

docs/coding-guidelines/libraries-packaging.md

@@ -18,6 +18,14 @@ Source generators and analyzers can be included in the shared framework by addin
 
 Removing a library from the shared framework is a breaking change and should be avoided.
 
+### References to libraries in the shared framework that produce packages
+
+It's beneficial to avoid project references to libraries that are in the shared framework because it makes the package graph smaller which reduces the number of packages that require servicing and the number of libraries that end up being copied into the application directory.
+
+If a dependency is part of the shared framework a project/package reference is never required on the latest version (`NetCoreAppCurrent`).  A reference is required for previous .NET versions even if the dependency is part of the shared framework if the project you are building targets .NETStandard and references the project there.  You may completely avoid a package dependency on .NETStandard and .NET if it's not needed for .NETStandard (for example - if it is an implementation only dependency and you're building a PNSE assembly for .NETStandard).
+
+Warning NETPKG0001 is emitted when you have an unnecessary reference to a library that is part of the shared framework.  To avoid this warning, make sure your ProjectReference is conditioned so that it doesn't apply on `NetCoreAppCurrent`.
+
 ## Transport package
 
 Transport packages are non-shipping packages that dotnet/runtime produces in order to share binaries with other repositories.

docs/deep-dive-blog-posts.md

@@ -10,6 +10,7 @@
 - [Performance Improvements in .NET 6](https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-6/)
 - [Performance Improvements in .NET 7](https://devblogs.microsoft.com/dotnet/performance_improvements_in_net_7/)
 - [Performance Improvements in .NET 8](https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-8/)
+- [Performance Improvements in .NET 9](https://devblogs.microsoft.com/dotnet/performance-improvements-in-net-9/)
 
 ### Posts that take a high-level look at the entire source:
 

docs/design/coreclr/botr/clr-abi.md

@@ -23,11 +23,14 @@ ARM64: See [Overview of ARM64 ABI conventions](https://learn.microsoft.com/cpp/b
 ## Non-Windows ABI documentation
 
 Arm corporation ABI documentation (for ARM32 and ARM64) is [here](https://developer.arm.com/architectures/system-architectures/software-standards/abi) and [here](https://github.com/ARM-software/abi-aa).
+Apple's ARM64 calling convention differences can be found [here](https://developer.apple.com/documentation/xcode/writing-arm64-code-for-apple-platforms).
 
 The Linux System V x86_64 ABI is documented in [System V Application Binary Interface / AMD64 Architecture Processor Supplement](https://github.com/hjl-tools/x86-psABI/wiki/x86-64-psABI-1.0.pdf), with document source material [here](https://gitlab.com/x86-psABIs/x86-64-ABI).
 
 The LoongArch64 ABI documentation is [here](https://github.com/loongson/LoongArch-Documentation/blob/main/docs/LoongArch-ELF-ABI-EN.adoc)
 
+The RISC-V ABIs Specification: [latest release](https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases/latest), [latest draft](https://github.com/riscv-non-isa/riscv-elf-psabi-doc/releases), [document source repo](https://github.com/riscv-non-isa/riscv-elf-psabi-doc).
+
 # General Unwind/Frame Layout
 
 For all non-x86 platforms, all methods must have unwind information so the garbage collector (GC) can unwind them (unlike native code in which a leaf method may be omitted).
@@ -76,7 +79,9 @@ On ARM and ARM64, just like native, nothing is put in the floating point registe
 
 However, unlike native varargs, all floating point arguments are not promoted to double (`R8`), and instead retain their original type (`R4` or `R8`) (although this does not preclude an IL generator like managed C++ from explicitly injecting an upcast at the call-site and adjusting the call-site-sig appropriately). This leads to unexpected behavior when native C++ is ported to C# or even just managed via the different flavors of managed C++.
 
-Managed varargs are not supported in .NET Core.
+Managed varargs are supported on Windows only.
+
+Managed/native varargs are supported on Windows only. Support for managed/native varargs on non-Windows platforms is tracked by [this issue](https://github.com/dotnet/runtime/issues/82081).
 
 ## Generics
 
@@ -97,6 +102,10 @@ Just like native, AMD64 has implicit-byrefs. Any structure (value type in IL par
 
 The AMD64 native calling conventions (Windows 64 and System V) require return buffer address to be returned by callee in RAX. JIT also follows this rule.
 
+## RISC-V only: structs passed/returned according to hardware floating-point calling convention
+
+Passing/returning structs according to hardware floating-point calling convention like native is currently [supported only up to 16 bytes](https://github.com/dotnet/runtime/issues/107386), ones larger than that differ from the standard ABI and are passed/returned according to integer calling convention (by implicit reference).
+
 ## Return buffers
 
 The same applies to some return buffers. See `MethodTable::IsStructRequiringStackAllocRetBuf()`. When that returns `false`, the return buffer might be on the heap, either due to reflection/remoting code paths mentioned previously or due to a JIT optimization where a call with a return buffer that then assigns to a field (on the GC heap) are changed into passing the field reference as the return buffer. Conversely, when it returns true, the JIT does not need to use a write barrier when storing to the return buffer, but it is still not guaranteed to be a compiler temp, and as such the JIT should not introduce spurious writes to the return buffer.
@@ -117,6 +126,12 @@ ARM64-only: When a method returns a structure that is larger than 16 bytes the c
 
 Primitive value types smaller than 32-bits are widened to 32-bits: signed small types are sign extended and unsigned small types are zero extended. This can be different from the standard calling conventions that may leave the state of unused bits in the return register undefined.
 
+## Small primitive arguments
+
+Small primitive arguments have undefined upper bits. This can be different from the standard calling conventions that may require normalization (e.g. on ARM32 and Apple ARM64).
+
+On RISC-V small primitive arguments are extended according to standard calling conventions.
+
 # PInvokes
 
 The convention is that any method with an InlinedCallFrame (either an IL stub or a normal method with an inlined PInvoke) saves/restores all non-volatile integer registers in its prolog/epilog respectively. This is done so that the InlinedCallFrame can just contain a return address, a stack pointer and a frame pointer. Then using just those three it can start a full stack walk using the normal RtlVirtualUnwind.