* Skip test on windows

* Delay file existence check

* Check file existence if there are additional probbing paths

* PR feedback

* Add needs_file_existence_checks

* Clean symlinks causing CI problems with stat

* Switch back to libc

* Ignore symlink deletion in osx

* Remove IFileStreamCompletionStrategy. This makes FileStreamCompletionSource only needed by Net5CompatFileStreamStrategy.

* Use AwaitableProvider for AsyncWindowsFileStreamStrategy.

* No need for ManualResetValueTaskSource class. Remove it to get rid of one allocation and get the actual profiling improvement.
Rename FileStreamAwaitableProvider.

* Bring back ReadAsync/WriteAsync code to the strategy for simpler code review. Shorter filename for awaitable provider.

* FileStreamCompletionSource can now be nested in Net5CompatFileStreamStrategy, and its _fileHandle can now be private.

* Remove duplicate error definitions, use centralized Interop.Errors.

* Move shared mask values to FileStreamHelpers to avoid duplication.

* Use Interop.Errors also in SyncWindowsFileStreamStrategy.

* Move misplaced comment, move method location.

* Slightly better comment.

* Rename FileStreamAwaitableProvider to FileStreamValueTaskSource to keep in sync with the name of FileStreamCompletionSource.

* Bring back the raw pointer intOverlapped.

* Rename MemoryAwaitableProvider to MemoryFileStreamValueTaskSource.

* Remove numBufferedBytes and avoid unnecessary allocation in Read(byte[],int,int).

* Rename files of nested types.

* Nested async result codes in static class.

* Address feedback.

* Address suggestions

* Bring back RunContinuationAsynchronously=true
Co-authored-by: Ncarlossanlop <carlossanlop@users.noreply.github.com>

* Add MachO dump writer to createdump

Instead of the hacky ELF core dumps on MacOS now createdump generates true MachO dumps.

Setting the COMPlus_DbgEnableElfDumpOnMacOS environment variable is no longer needed.

Add special thread info memory region containing the OS thread ids missing from macho core dumps. This allows SOS to map the thread indexes to thread ids. The address (0x7fffffff00000000) of this special memory region is above the highest user address (0x0007FFFFFFFFF000) and below a kernel reserved address (0xffffff8000xxxxxx) which is kind of moot because dumps don't include any kernel regions. lldb seems just fine with this memory region.

The changes include ARM64 support also, but since I don't have a M1 device I can't build/test them. I'm hoping Steve can at least review them.

Add --verbose/TRACE_VERBOSE support to tone down all the macho dump generation spew.

Issue: #48664

* Fix build problem

* Update docs

* Code review feedback
Co-authored-by: NJuan Sebastian Hoyos Ayala <juhoyosa@microsoft.com>

* Include condition for forward jump loops

* Remove IGF_FINALLY_TARGET and surrounding code

Pass DEBUG_ARG(bbnum) to `emitAddLabel()` to print the BB->IG mapping.

* Revert "Remove IGF_FINALLY_TARGET and surrounding code"

This reverts commit 284c0abc202cca2de22787bf18081076200e5272.

* Pass bbNum to emitAddLabel

* fix Release build break

Apple Silicon requires a different distribution template

Set options.hostArchitectures to stop requiring Rosetta

Adjust minimum required version to 11.0

* Update Alpine ARM docker image

The Alpine ARM docker image is used for cross compilation. There was a
breaking change in Alpine 3.13 - it uses a new MUSL that has 64 bit
time_t even on 32 bit platforms. Since the official support for Alpine
ARM was not announced yet, it was decided that we will support it only
on Alpine >= 3.13 instead of having to build and distribute two different
versions of runtime.

This change updates the docker image used to build Alpine ARM runtime to
a new version that uses Alpine 3.13 rootfs. It is also using Ubuntu
16.04 instead of 18.04 as a host to unify it with the one we use to
build for Alpine ARM64.

* Update helix queue for Alpine ARM to use Alpine 3.13

* Added a missing license header

* Added a test verifying that checked arithmetic is correct

* Added a test verifying that checked casts are correct

* Refactored VNEvalShouldFold

* Refactored gtFoldExprConst to use helpers and follow the common code style

* Fixed the comment stating TYP_BYREF has no zero value

* Moved checking of overflow for arithmetic operations from gtFoldExprConst into a separate namespace

* Implemented folding of overflow arithmetic in value numbering

* Fixed some typos in valuenum.cpp/h

* Added identity-based evaluation for overflow arithmetic

* Refactored gtFoldExpr some more, moved the overflow checking logic to CheckedOps, implemented overflow checking for floating point -> integer casts

* Implemented folding of checked casts in value numbering, started value numbering casts via helpers like normal casts

* Fixed the formatting

* Made the definition of var_types a standalone header so that it can be safely #included'ed in utils.h

* Replaced uses of GTF_CALL_M_SPECIAL_INTRINSIC with the equivalent helpers

* Fold cast via helpers in morph

* Disable the test for checked casts on Mono

GitHub Actions started doing shallow checkouts so we often ran into the case where applying the patch would fail with an error due to the commit blobs not being available:

```
error: sha1 information is lacking or useless (eng/pipelines/common/xplat-setup.yml).
error: could not build fake ancestor
```

Fix this by always checking out the whole history. Since this makes checkout quite slow (~2mins), refactor the action so we post the "Started backporting" comment before doing the checkout so the user isn't confused why nothing happens.

* Fix issue with Win32 resource placement

Windows has a bug in its resource processing logic that occurs when
1. A PE file is loaded as a data file
2. The resource data found in the resources has an RVA which has a magnitude greater than the size of the section which holds the resources
3. The offset of the start of the resource data from the start of the section is not zero.

As it is impossible to effect condition 1 in the compiler, and changing condition 2 would require bloating the virtual size of the sections, instead require that the resource data is located at offset 0 within its section, by sorting the Win32ResourceNode to be the first node.

* Update src/coreclr/tools/aot/ILCompiler.ReadyToRun/ObjectWriter/SectionBuilder.cs
Co-authored-by: NMichal Strehovský <MichalStrehovsky@users.noreply.github.com>
Co-authored-by: NMichal Strehovský <MichalStrehovsky@users.noreply.github.com>

* Modify TC to compare strings before ':'

In order to avoid failure due to modification of #44013,
the TC has been modified so that the content after':' is not compared.

* Enable OOMException01

Failed TC is fixed at #51280

* Simplify JIT label handling

Remove the BBF_JMP_TARGET flag that was set early and attempted
to be maintained all through compilation. Instead, use
BBF_USE_LABEL to indicate to the emitter where we need labels.

Also, stop setting and maintaining BBF_USE_LABEL early.

Add a pass over the blocks when preparing for codegen that sets
most of the necessary BBF_USE_LABEL flags. This flag will never
be set before codegen. A few places set the flag after codegen starts,
namely `genCreateTempLabel` and BBJ_COND handling for alignment.
Note that this flag must be set before the block is processed for
codegen (and an insGroup is created).

Together, these changes make it easier to work with the flow graph
without worrying about maintaining these bits of information through
various optimizations.

Add a few more details about alignment processing to the dump.

There are a few code asm diffs due to alignment processing not previously
creating a label to help compute how large a loop is.

There are a lot of textual asm diffs due to there being (mostly)
fewer labels, plus some additional insGroup output. This can happen if
a block was labeled with `BBF_JMP_TARGET` or `BBF_USE_LABEL` before,
but didn't need to be, perhaps after some optimizations. Now, the flag is
never added in the first place.

There are a large number of GC info diffs. Labels are where GC info state
changes are recorded between codegen and the emitter. If we eliminate an
unnecessary emitter label, then we also eliminate a capture of the current
codegen GC state. Since the emitter is lazy at marking GC deaths, this
means that we see a lot of lengthened GC lifetimes -- until the next
label, or some other cause of GC kill. Often, you see a register kill
followed by register birth just disappear, and the register is maintained
alive across the interim.

* Remove loop align flag if we decide a loop is no longer a loop

I found out that the crash was caused by an incompletely handled
corner case in generic lookup - incomplete comparison of
GenericLookupKey matched two generic lookups which in reality
involved two different constrained types.

While fixing this I added a new variant to
RuntimeDeterminedTypeHelpers for comparing MethodWithToken and
I fixed null handling that was inconsistent among the individual
type variants of the Equals and GetHashCode methods.

Thanks

Tomas

Add stub definitions of inject debug resources targets to fix runtimeinfo build dependency issues. (#51254)

[MONO][WASM] Fix System.ComponentModel.TypeConverter tests by  adding missing ILLink dependencies (#50645)

Added missing ILLink descriptors for TypeConverter tests.

Co-authored-by: NGeoffrey Kizer <geoffrek@windows.microsoft.com>

* Don't call into unsupported APIs on build targets which don't support quic

The code could be extracted to HttpConnectionPool.quick.cs but not sure
it's worth the split as that would move the majority of the code.

Fixes #49201
Fixes #49187

* if-def less version

* Quic IsSupported working and not throwing for AnyOS.

* Fix for running the newly added UnitTest.

* Add missing unsupported targets

* Reverted Quic changes.

* Unsupported to Supported

* Guarded unsupported calls with OperationgSystem.Is...()

* Addressed comments.

* Analyzer fixed, macOS fixed.

* Trimming test.

* Removed test.

* Guard more unsupported platform calls

* Some more analyzer attributes.

* Fix for Android, which returns true for IsLinux().

* Skip failing trimming test on wasm

* Removed additional UnsupportedOS attributes, referenced issue.
Co-authored-by: NMarie Píchová <mapichov@microsoft.com>

We had those in the original mono/mono build.

* [sdb][coop] Switch to GC Safe before calling debugger transport callbacks

Fixes https://github.com/dotnet/runtime/issues/50966

Under hybrid suspend, if we call the debugger callbacks like `transport_recv`
in GC Unsafe (cooperative) mode, we could get a GC suspend deadlock: the
suspend initiator will be waiting for the debugger thread to self-suspend, but
the debugger thread will be blocked in `recv` until it receives a debugger
command (which probably will not come since from the debugger's point of view
nothing is happening in the debuggee, so there's no event to respond to).

The socket transport already had GC safe transitions, but since the runtime
allows external embedders to register their own protocols, we need the GC state
transitions around the calls to the callbacks, not around the I/O operations.

The tricky bit is `transport_connect` - as far as I can tell it's always called
after the MonoThreadInfo has been initialized and the current thread has been
attached to the runtime - so thread state transitions should work. (The tricky
one is `transport_connect` which happens early in startup in some
configurations.  But in that case `finish_agent_init` is called by
`debugger_agent_init` which also calls `mono_gc_base_init` which sets up the
thread state and attaches the thread)

As followup work, we will need to adjust net7+ watchOS in
https://github.com/xamarin/xamarin-macios _not_ to do a transition to GC Safe
in its `sdb_send` and `sdb_recv` functions.  This is https://github.com/xamarin/xamarin-macios/issues/11220

* add transitions to unsafe in calls back into mono

SocketAddressTest.ToString_UnsupportedFamily_Throws test fails on Android in case of AddressFamily.Packet and AddressFamily.ControllerAreaNetwork because it expects PNSE for both address family types but there is no any exception thrown.  

This change disables the mentioned test on Android due to different behavior. Also, I'm not sure whether the test has right name.  

#47911 (comment) 

* Update msquic revision in docs after certificate work.

* New ActiveIssue and a type in comment.

Mark PNSE-throwing methods in System.Net.NetworkInformation.IPGlobalProperties as unsupported on Android (#50855)

Part of #47911.  

This is to annotate the following methods in System.Net.NetworkInformation.IPGlobalProperties as unsupported on Android since they throw PNSE:  

- GetActiveTcpConnections();
- GetActiveTcpListeners();
- GetActiveUdpListeners();

* Add InterpolatedStringBuilder

* Address PR feedback

* Revise based on API review

* Address PR feedback

* Fix DateOnly/TimeOnly

* Currently the CMAKE_BUILD_TYPE is not being passed in when
  creating the native library intermediates.
* Before the change to Ninja for CMake generation (8c2158f9)
  the default uninitialized cmake build type was set to Release so the
  bug was not visible.
* After the Ninja change, the default uninitialized cmake build type
  is set to Debug so it becomes more apparent.
* This improves performance of native libs like System.IO.Compression
  by a considerable amount as they are currently being built in Debug,
  even when the Release configuration is specified.

`LibSystemCommonCrypto` and `LibSystemKernel` are unused by any code so removing them as dead code.

In
https://github.com/dotnet/runtime/pull/49738/files#diff-9bd9d0e46241d07dc62110246c89c9f056333eff4b0b089551780a625c871d0dL1982

When the code changed from acessing ca->rows directly, to using
table_info_get_rows, the "then" branch here was changed incorrectly.

The old code was

```c
if (method_index == ca->rows) {
		ca = &image->tables [MONO_TABLE_PARAM];
		param_last = ca->rows + 1;
```

So `param_last` should be set to one past the last row of
MONO_TABLE_PARAM, not one past the number of rows in MONO_TABLE_METHOD (ca)

* Rename JsonClassInfo to JsonTypeInfo

* Move existing metadata types to new Metadata sub-folder/sub-namespace

* Add JsonMetadataServices and APIs needed by source generator

* Add tests and address feedback

* Rename ClassType to ConverterStrategy and clean up usage

* Move JsonSerializerContext to S.T.J.Serialization namespace and address doc feedback

* enable compression of assemblies

* fix Unix build

* map should use converted layout for compressed

* enable execution for R2R

* fixes for OSX

* PR feedback (comments)

* more PR feedback

* shorter include path to pal_zlib.h

* Apply suggestions from code review
Co-authored-by: NVitek Karas <vitek.karas@microsoft.com>
Co-authored-by: NVitek Karas <vitek.karas@microsoft.com>