- Update comments on XM45.targets file
- Remove unnecessary AssemblySearchPaths hack causing issues using nugets with same name as Facades
- Note: MSBuild with XM 4.5 is still broken for now
This cuts down another group of conditional compilation sections, paving the
way for an IKVM-based generator.
This makes it required to pass --target-framework for to generator executables
(previously only required for Xamarin.Mac/Unified to distinguish between the
different Xamarin.Mac/Unified variants), but it should be invisible to users
since we'll automatically pass the correct --target-framework argument from
the corresponding scripts (btouch/btv/bwatch/bmac) and the MSBuild targets.
This will only break somebody who is executing the managed executables
directly, but nobody should do that in the first place (it's not a supported
scenario).
Generated diff: https://gist.github.com/rolfbjarne/1674be6625632446dba774a305951981
Besides the obvious reasons, this is also useful when testing warnings, since
by making warnings errors, mtouch/mmp will exit a lot faster (and the tests
will finish faster).
The cached linker results can have multiple identical input assemblies (for
assemblies that show up in both the app and any app extensions), so make sure
we don't load those more than once.
Since the linker can process multiple apps/appex'es at the same time, it also
means it will put together all the required symbols found in _all_ assemblies.
This means that we need to filter out required symbols for other
apps/appex'es.
Change cache invalidation so that if any app extension's cache is invalid,
then invalidate the cache for the container app and all other app extensions.
This is the safest option when we're sharing code.
Don't use the global command line arguments to determine input, because that's
not the input we use for app extensions anymore.
Instead explicitly pass the input arguments when creating the cache.
Since neither mtouch nor mmmp is mkbundled anymore, the installed binary is in
fact a shell script.
This means that it's quite useless to check if the shell script has been
modified; instead check if the executing assembly has been modified (which
works now that we're not mkbundled anymore).
We must build each appex bundle before the container bundle, so that we can
compute the frameworks each appex the needs before bundling the container app.
Also there's no need to store the list of frameworks appex's need in a file,
since everything is now done in the same mtouch process.
Implement support for sharing both code and resources between app extensions
and their container app:
* AOT-compiled code. Each shared assembly is only AOT-compiled once, and if
the assembly is built to a framework or dynamic library, it will also only
be included once in the final app (as a framework or dynamic library in the
container app, referenced directly by the app extension). If the assemblies
are built to static objects there won't be any size improvements in the app,
but the build will be much faster, because the assemblies will only be AOT-
compiled once.
* Any resources related to managed assemblies (debug files, config files,
satellite assemblies) will be put in the container app only.
Since these improvements are significant, code sharing will be enabled by
default.
Test results
============
For an extreme test project with 7 extensions (embedded-frameworks)[1]:
with code sharing cycle 9 difference
build time 1m 47s 3m 33s -1m 46s = ~50% faster
app size 26 MB 131 MB -105 MB = ~80% smaller
For a more normal test project (MyTabbedApplication)[2] - this is a simple application with 1 extension:
with code sharing cycle 9 difference
build time 0m 44s 0m 48s -4s = ~ 8% faster
app size 23 MB 37 MB -15 MB = ~40% smaller
Another tvOS app with one extension also show similar gains (MyTVApp)[3]:
with code sharing cycle 9 difference
build time 0m 22s 0m 48s -26s = ~54% faster
app size 22 MB 62 MB -40 MB = ~65% smaller
[1]: https://github.com/rolfbjarne/embedded-frameworks
[2]: https://github.com/xamarin/xamarin-macios/tree/cycle9/msbuild/tests/MyTabbedApplication
[3]: https://github.com/xamarin/xamarin-macios/tree/cycle9/msbuild/tests/MyTVApp
Warn if mtouch loads an assembly from a different location than requested
(which might be because there are multiple assemblies with the same name).
Also rework the MT0023 check a bit by explicitly loading the root assembly
first, and then detecting if any loaded assemblies matches the root assembly.
This results in code that's a bit more obvious, and it also works correctly
with extensions (previously the entire MT0023 check was skipped for
extensions).
Allow the assembly build target name for frameworks to end with '.framework',
so that the following:
--assembly-build-target=@sdk=framework=Xamarin.Sdk.framework
doesn't end up creating Xamarin.Sdk.framework.framework.
Store the location of every assembly that can't be deduced at runtime (i.e.
all assemblies that are build to frameworks, since there can be multiple
assemblies in each framework, and the framework name can be customized).
Detect when assemblies have native dependencies between them (which can happen
when there are multiple binding projects, and the native libraries in those
binding projects have dependencies between them), and add the proper link
arguments (this is only required when building to dynamic libraries or
frameworks, since otherwise everything is linked to one big binary and there
are no dependency problems).
https://bugzilla.xamarin.com/show_bug.cgi?id=43689
The previous build system kept a forward-pointing single linked list of tasks
to execute: task X had a list of subsequent tasks to execute. If task X was
up-to-date, it was not created (and the next tasks were directly added to the
list of tasks to execute).
In this world it became complicated to merge output from tasks (for instance
if the output of task X and task Y should be a consumed by a single task
producing a single output, since the corresponding task would end up in both
X's and Y's list of subsequent tasks).
Example: creating a single framework from the aot-compiled output of multiple
assemblies.
So I've reversed the logic: now we keep track of the final output, and then
each task has a list of dependencies that must be built.
This makes it trivial to create merging tasks (for the previous example, there
could for instance be a CreateFrameworkTask, where its dependencies would be
all the corresponding AotTasks).
We also always create every task, and then each task decides when its executed
whether it should do anything or not. This makes it unnecessary to 'forward-
delete' files when creating tasks (say you have three tasks, A, B, C; B
depends on A, and C depends on B; if A's output isn't up-to-date, it has to
delete its own output if it exists, otherwise B would not detect that it would
have to re-execute, because at task *creation* time, B's input hadn't
changed).
Additionally make it based on async/await, since much of the work happens in
externel processes (and we don't need to spin up additional threads just to
run external processes). This makes us have less code run on background
threads, which makes any issues with thread-safety less likely.
The AOT-compilation occurs in the AOT-task now, and then we compile the result
using CompileTask.
This means that the error message in CompileTask was slightly incorrect, so
rectify it.
This makes dylibs automatically have the correct dylib id, which means no
fixups are required.
For instance: we'd build libpinvokes.armv7.dylib from libpinvokes.armv7.m,
which by default ends up with a dylib id of "libpinvokes.armv7.dylib". With
this fix no change is required, since we now build armv7/libpinvokes.dylib
from armv7/libpinvokes.m.
Compute the dependency map for assemblies earlier, and store the results.
In a later commit we'll need to know if a dependency map was successfully
computed when determining if a task is up-to-date or not.
Rework the code that copies assemblies and their related files to the app
bundle to take into account that we might be building to frameworks now.
Also strip the assemblies when they're copied (if they must be stripped),
which removes the need for custom logic to copy files related to stripped
assemblies.
Additionally change how we handle duplicated assemblies by checking for
duplication before copying them to the app bundle. This allows us to copy
assemblies to the root directory (not the .monotouch-[32|64] subdirectory) if
the 32-bit and 64-bit versions are identical, which also means we won't need
symlinks anymore.
Make the architecture a suffix instead of infix for aotdata filenames so that
it's easier to compute the filename from the assembly name without passing
printf-style format strings around.
Create a custom AssemblyCollection class that contains a dictionary with
assembly identity (name) -> Assembly mapping.
This also means that we can detect if we end up loading multiple assemblies
with the same identity, and show an error in that case (even if that case
should never happen since we cache assemblies based on the identity, it's nice
to have code that ensures it).
Cecil cannot save an assembly more than once without reloading its
debugging symbols. There was code for this, in the special case where
an assembly could be saved more than once. However the order of the
operations changed and the code to reload symbols was now located too
late.
https://bugzilla.xamarin.com/show_bug.cgi?id=51667
* [XM] Seperate parsing from compilation in AOT code
- Parsing command line options was too entangled with actually compiling
- Refactor test code to centralize Compile, reducing some complexity of tests
- Groundwork for hybrid vs non-hybrid AOT work
* Add hybrid/standard AOT support
* Add xammac_tests to makefile/jenkins
* Add flag to force AOT
* Disable MonoTouchFixtures.Contacts.ContactStoreTest.GetUnifiedContacts on XM due to prompts on Jenkins
Fixes: https://bugzilla.xamarin.com/show_bug.cgi?id=52238
If you give mtouch/mmp a linker xml file with bad input for
example a Xamarin.iOS app and the linker.xml has a reference
to Xamarin.Mac instead of X.I.dll i.e.
<?xml version="1.0" encoding="UTF-8" ?>
<linker>
<assembly fullname="Xamarin.Mac">
<type fullname="ObjCRuntime.Constants"/>
</assembly>
</linker>
You will get a not so helpful generic error
MT2001 Could not link assemblies. Reason: Failed to process XML description: <unspecified>
It seems that when you use a xml file for linker you get a
`XmlResolutionException` from cecil when it fails to resolve
and the better error comes from the inner exception so we use
that instead.
New error output for XmlResolutionException:
MT2017: Could not process XML description: Failed to resolve assembly: 'Xamarin.Mac, Culture=neutral, PublicKeyToken=null'
Resource files for mac should be copied to the app bundle
* Move the Satellite code used by mac to tools/common/Assembly.cs
* Add EmbeddedResources test to xammac_tests
a. System.Net.Http.Primitives.dll is user code *and* contains type
forwarders (it's like a facade) to another facade assembly,
System.Net.Primitives.dll, that ships with the SDK;
b. The former, System.Net.Http.Primitives.dll, is not processed by
the linker, e.g. no code is removed and the assembly cannot be deleted.
However we save back (as much as we can [1]) the result of any type
being resolved;
c. It also means the later, System.Net.Primitives.dll, is fully linked
and (in many cases) can be removed from the final application (as it's
mostly forwarders).
d. This means the final, re-saved, System.Net.Http.Primitives.dll binary
could point to non-existing metadata, i.e. the removed
System.Net.Primitives.dll, because of [1].
Because we resolve (and save) the forwarders *and* because we do not
allow code downloads or generation (Apple restriction) it is possible to
remove the forwarders, which will fix the issue for XI.
[1] The scope of exported types cannot be updated
abb4e902da/Mono.Cecil/ExportedType.cs (L41)
There is also a enhancement bug, #11165, about this but it predated our
PCL support and the resolve-n-save that we now do for forwarders. This
is now _fully_ fixed.
References:
* https://bugzilla.xamarin.com/show_bug.cgi?id=11165 (enhancement)
* https://bugzilla.xamarin.com/show_bug.cgi?id=51805
Most projects building to bitcode (any kind of bitcode, this includes the
marker-only version as well), will fail to link when linking with third-party
libraries and incremental builds are enabled.
So automatically disable incremental builds when we detect this scenario.
This is only a workaround until we can make this scenario build correctly.
https://bugzilla.xamarin.com/show_bug.cgi?id=51710
Use @rpath instead of @executable_path in dylibs, since it allows us to be
more flexible when placing dylibs in the app.
In particular with this change it's trivial to put libmonosgen-2.0.dylib in
the container app, and reference it from extensions.
According to Vlad it's not necessary to set MONO_GC_PARAMS during AOT-
compilation, since all MONO_GC_PARAMS options can be changed at runtime:
Rolf Kvinge [16:35] @vlad.brezae is this true for all the different options MONO_GC_PARAMS take: https://github.com/xamarin/xamarin-macios/pull/1546#discussion_r97318092?
Rolf Kvinge [16:36] I remember this: https://bugzilla.xamarin.com/show_bug.cgi?id=35414#c14
Rofl Kvinge [16:36] which apparently you changed here, so that it can be changed at runtime: https://bugzilla.xamarin.com/show_bug.cgi?id=35414#c27
Rolf Kvinge [16:36] but I don't know if this is true for all the options you can pass using MONO_GC_PARAMS
Vlad Brezae [16:41] yes, it should be true for all of them, that was a bug
Rolf Kvinge [16:41] ok, that's great news 😄
Performance tests
-----------------
This is for a new watchOS extension project, built for release.
* The default (currently -O2) optimizations: 41s ( baseline ) 30.027.060 bytes ( baseline )
* All optimizations disabled (`--llvm-opt=all=`): 17s (-24s = -59%) 32.978.312 bytes (+2.951.252 = +10%)
* Optimized for size (`--llvm-opt=all=-Os`): 36s ( -5s = -12%) 28.617.408 bytes (-1.409.652 = -5%)
* Optimized for more size (`--llvm-opt=all=-Oz`): 35s ( -6s = -15%) 28.601.016 bytes (-1.426.044 = -5%)
* Optimized slightly (`--llvm-opt=all=-O1`): 35s ( -6s = -15%) 28.666.556 bytes (-1.360.504 = -5%)
* Optimized a lot (`--llvm-opt=all=-O3`): 41s ( 0s = 0%) 30.403.996 bytes (+ 376.936 = +1%)
Conclusions
-----------
* The fastest build by far (less than twice as fast) is if optimizations are
disabled, but this adds a 10% size penalty (~3 MB in this test case),
compared to the baseline, and 15% size penalty (4.3 MB) compared to -Oz.
* -Oz seems to have the best overall results: at least as fast as any other
optimized build, and the smallest app as well.
Caveats
-------
Some optimizations might not work the AOT compiled code. The resulting
binaries have not been tested.
Event sequence:
* mtouch is executed with the linker disabled.
* The linker pipeline copies all input assemblies (since the linker is
disabled the assemblies don't change) into the PreBuild directory. This will
keep the original timestamps of the input assemblies.
* mtouch is executed again, when none of the input assemblies changed.
* The linker pipeline will re-execute, because it will see that at least one
of the input assemblies (at least the .exe) is newer than at least one of
the assemblies in the PreBuild directory (usually a framework assembly,
because those have the original timestamp from their install location).
Fix:
Touch all the assemblies in the PreBuild directory after the linker pipeline
executes the first time. This way the second time mtouch is executed, it will
find that all assemblies in the PreBuild directory have timestamps later than
all the input assemblies, so it will load the cached linked assemblies,
instead of re-executing the linker pipeline.
Switch to a new API introduced in Cecil added new API to get all the
attributes in an assembly, without having to traverse (and load) every type
and member.
This makes mtouch significantly faster when computing the list of referenced
assemblies, which is noticable when mtouch later determines nothing else needs
to be done (because nothing changed).
A few tests show that mtouch is now approximately twice as fast:
* A customer test project goes from 2s to 1s.
* A simple test app goes from 1.3s to 0.6.
https://bugzilla.xamarin.com/show_bug.cgi?id=49087
The native linker treats object files (.o) and static libraries (.a files,
which are archives of .o files) differently.
The native linker will always include object files into the executable:
$ echo "void xxx () {}" > foo.m
$ clang -c foo.m -o foo.o -arch x86_64
$ ld foo.o -dylib -o foo.dylib -macosx_version_min 10.12 -arch x86_64
$ nm foo.dylib
0000000000000fe0 T _xxx
However, if the object file is inside a static library:
$ echo "void xxx () {}" > foo.m
$ clang -c foo.m -o foo.o -arch x86_64
$ ar cru foo.a foo.o
$ ld foo.a -dylib -o foo.dylib -macosx_version_min 10.12 -arch x86_64
$ nm foo.dylib
<no output>
This means that our testing library (libtest.a) which is a fat library of
_object files_, do not show the problems reported in bug #51548.
So:
a) I've fixed the creation of libtest.a to be a fat library of _static
libraries_. This causes the `FastDev_LinkWithTest` test to fail exactly
like in bug #51548.
b) I've made mtouch pass `-u <native symbol>` to the native linker, for every
native symbol referenced in a managed assembly, when creating a dylib.
Amazingly this seems to work fine even with symbols to Objective-C classes
(`_OBJC_CLASS_$_<class name>`).
c) This also required adding support for collecting the Objective-C names of
all managed types registered with Objective-C to the linker. The
information is already available in the static registrar, but that would
require us to make sure the static registrar is executed before compiling
dylibs, which means those two tasks won't be able to run in parallel (also
there's no guarantee we'll even run the static registrar).
https://bugzilla.xamarin.com/show_bug.cgi?id=51548
TL&DR: This is *how* it should be done and tested, it's not complete
(single, simple case) nor the most interesting case ;-)
The trick is to make sure each case is covered by tests so a mono
_bump_ won't give us a BCL that does not conform to what the linker
expect.
What's the impact ?
1. There is the expected reduction of metadata in mscorlib. Since both
methods don't call other API there's no indirect effect (removal).
--- before 2017-01-15 11:12:44.000000000 -0500
+++ after 2017-01-15 11:12:56.000000000 -0500
@@ -13166,9 +13166,6 @@
System.Void System.Security.SecurityException::.ctor(System.Runtime.Serialization.SerializationInfo,System.Runtime.Serialization.StreamingContext)
System.Void System.Security.SecurityException::.ctor(System.String)
System.Void System.Security.SecurityException::GetObjectData(System.Runtime.Serialization.SerializationInfo,System.Runtime.Serialization.StreamingContext)
-System.Boolean System.Security.SecurityManager::CheckElevatedPermissions()
-System.Security.SecurityManager
-System.Void System.Security.SecurityManager::EnsureElevatedPermissions()
System.Security.SecurityRulesAttribute
System.Security.SecurityRuleSet System.Security.SecurityRulesAttribute::m_ruleSet
System.Void System.Security.SecurityRulesAttribute::.ctor(System.Security.SecurityRuleSet)
2. There is no visible size change (even with #1) in mscorlib.dll due to
padding (compiler /filealign)
mscorlib.dll 793,600 793,600 0 0.00 %
3. there's a *very* small reduction of mscorlib.*.aotdata size
mscorlib.armv7.aotdata 717,264 717,216 -48 -0.01 %
mscorlib.arm64.aotdata 712,840 712,704 -136 -0.02 %
AOT data *.aotdata 6,460,064 6,459,880 -184 0.00 %
4. there's no change in executable size - normal as the AOT compiler has
_likely_ already doing the same optimization (before this commit)
Executable 29,270,272 29,270,272 0 0.00 %
Full comparison: https://gist.github.com/spouliot/0464c8fa3a92b6486dfd90595d9eb718
We're not storing selectors in fields anymore so this step does nothing
expect iterating over the code.
The step is still needed for `mmp` (for Xamarin.Mac.dll)
Simplify code a bit to avoid constant null checking and also take advantage of
the fact that HashSet.Add returns if the value was added or not (to avoid a
Contains check).
This allows mtouch to give better error message when something unexpected
occurs in the linker pipeline (at least for the sub-steps).
Practically it means fewer, contextless MT2001 errors. The replacements
error code are more precise, e.g.
* what was being done;
* what was being processed
and helps both diagnosing and, possibly, gives clues for workarounds
Build extensions and the container app in the same mtouch process, by storing
all the mtouch arguments when called to build extensions in a text file, and
then reloading those arguments when called to build the main app.
This is required if we want to share code between extensions and the
container.
This is a series of fixes to the dynamic libraries we build / create to remove
any unnecessary bloat (unused architectures, bitcode).
A brand new watchOS app with no changes goes from 35MB to 11MB with these
fixes (with incremental builds disabled, the app size is 10MB).
--------------------------------------------------------------------------------
* [runtime] Split list of architectures into simulator and device-specific lists.
* [runtime] Build separate dylibs for device and simulator.
Build separate dylibs for device and simulator, since we already install these
into different locations.
This makes both the simulator and device builds slightly faster (since the
respective dylibs are smaller, and less data to copy around).
For watchOS apps, this saves ~430kb.
* [runtime] Strip bitcode from dylibs. Fixes#51352.
We know that dylibs will never be shipped to the App Store, so we'll never
need them to have bitcode.
So just strip the bitcode from all our dylibs, since this makes apps with
fastdev significantly smaller (and thus much faster to upload to watch
devices).
For watchOS apps this is a very significant improvement: a branch new watchOS
app without any changes goes from 35MB to 17MB.
https://bugzilla.xamarin.com/show_bug.cgi?id=51352
* [mtouch] Fix dylib compilation to not embed full bitcode.
Facts
=====
a. The output from the AOT compiler is an assembly (.s) file.
b. Clang's assembler does not support -fembed-bitcode-marker (only -fembed-
bitcode), so when we ask clang to -fembed-bitcode-marker, the assembler
receives a -fembed-bitcode argument.
c. This means that the assembled object file does not contain the
__LLVM/__bitcode and __LLVM/__cmdline sections (it does however contain an
__LLVM/__asm section).
d. The native linker will create a bitcode assembly section if none of the
object files passed to the linker contain a __LLVM/__bitcode section and
there's an __LLVM/__asm section present.
e. The end result is that when we build to a dylib, we end up (unexpectedly,
because we ask Clang to -fembed-bitcode-marker) including both armv7k and
bitcode in the dylib, thus bloating the dylib size significantly.
Solution
========
We manually add the __LLVM/__bitcode and __LLVM/__cmdline sections to the .s
file Mono's AOT compiler generated. This way the .o file will have the magic
sections, and the linker will not include bitcode (only the bitcode marker) in
the final library.
An empty watchOS extension with incremental builds is now 6MB smaller (down
to 11MB from 17MB).
Auto-install locally after building in the IDE, so that running mtouch tests
after running the mtouch project doesn't require switching to the command
line.
The `generic_icollection_class` condition (in class.c) does not match the mscorlib.xml descriptor file.
+ IEnumerator`1
+ IReadOnlyList`1
+ IReadOnlyCollection`1
reference:
https://bugzilla.xamarin.com/show_bug.cgi?id=50290
So that there can be multiple caches in the same process (which we'll have
once mtouch can compile extensions and the container app in the same process).
Fixes this test failure:
Xamarin.Registrar.MT4161 : Unexpected error/warning with --registrar:static:
error MT0000: Unexpected error - Please file a bug report at http://bugzilla.xamarin.com
* [mtouch] Remove most static state and put it on an instance.
Remove most static state, and put it on an instance (of Application) instead.
Soon we'll build multiple apps (app extensions) in the same process, and we
need to make sure we're not inadvertedly (and incorrectly) sharing state
between apps, so remove as much static state as possible to avoid any
problems.
* [mtouch] Rename GetIsUsingClang -> IsUsingClang.
* [mtouch] Always require a SDK version when building.
Technically it was required before too, but the error messages were non-optimal:
it could for instance complain that the user is using an iOS framework that
was introduced in iOS 2.0.
* [mtouch tests] Rewrite MT0060 and MT0061 tests to use MTouchTool.
This makes sure we pass --sdk to mtouch (which MTouchTool does by default), so
that we don't run into MT0025 before the errors we're testing for.
Add support for specifying the profile with the target framework,
and support using "Version=" before the version:
Xamarin.Mac,Version=v2.0,Profile=Mobile.
The BundleId property is used by the code that generates the mSYM directory,
but its value was always the default value 'com.yourcompany.sample' instead of
looked up in the app's Info.plist.
So fix the BundleId property to do the expected.
Also fix the mSYM test (SymbolicationData) to actually test mSYM stuff (it was
partially disabled when we disabled automatic mSYM generation for C8, and
never re-enabled), and port it to the new and better test syntax, and add a
few more asserts to check the manifest.xml generation.
-lsqlite3 is a linker flag, not a file to be linked with, so when
automatically determining that we need to pass -lsqlite3 we need to put it in
the right list of linker information.
Otherwise we may end up passing `-force_load -lsqlite3` to the linker (if the
assembly's ForceLoad flag is set), which won't compile.
https://bugzilla.xamarin.com/show_bug.cgi?id=49220
* [XM] Change mmp defaults to static registrar and disable lldb attach in release mode
- Static registrar is now proven and can be flipped on for default on release
- LLDB attach isn't very helpful in release mode and pops up the install xcode dialog
- Relax Unified_HelloWorld_ShouldHaveNoWarnings to exclude static registrar warnings due to https://bugzilla.xamarin.com/show_bug.cgi?id=48311
- `LoggingExtensions` has a new `MTError` extension method that helps generate
an msbuild error with the proper MTxxx format.
- Added error codes for 44 msbuild errors.
- Updated `docs/website/mtouch-errors.md` and `tools/mtouch/error.cs` accordingly.
- MT7001 contains some extra documentation (troubleshooting steps).
* [mtouch] Bring back PreBuildDirectory
Some mtouch unit tests failed because of timestamp checks. It's not clear
it's always a win (it's not in my original test case) not to copy (to
target) as it means we have to copy earlier (PreBuild + Build).
More investigation needed, there's probably a better way to achieve both.
In the mean time this should fix the failing tests cases.
* Fix up / simplify logic and avoid duplicate calls to IsUpdate
The old `legacy` option will now be reported as a warning.
That's by design an warning would require manually editing the .csproj
file (when the UI gets removed, as planned, from the IDE).
This is part of
https://trello.com/c/SrgU38DN/647-only-ship-support-appletls
Note: The BCL changes will happen in later stages.
Earlier versions of Xamarin Studio stored an invalid http message handler in
watchOS project files, which would cause a build error. In addition Xamarin
Studio removed the UI to set the http message handler (since only one value is
valid), which meant that the user had to edit the project file by hand to get
around this build error.
So make it a warning instead (and document what the user has to do to fix the
warning).
https://bugzilla.xamarin.com/show_bug.cgi?id=46552
Use metadata tokens instead of strings to find types and methods.
This makes the code to find methods more compact (a lot less strings in the
executable, and additionally in most cases a compact representation (32-bit
integer) of the corresponding metadata token and additional information can be
used, which results in less executable code (fewer parameters to methods,
etc)), resulting in smaller executables.
Size savings are around 200kb for dont link apps, and 20-60kb for linked apps
(this obviously varies a lot depending on how much has to registered by the
registrar).
| | Before | After | Diff |
|----------------|--------------:|--------------:|------------------:|
| dontlink/32bit | 102.810.144 | 102.609.456 | -200.688 = -0,20% |
| dontlink/64bit | 107.420.576 | 107.221.792 | -198.784 = -0,19% |
| linksdk/32bit | 40.957.296 | 40.936.864 | -20.432 = -0,05% |
| linksdk/64bit | 43.113.136 | 43.093.936 | -19.200 = -0,04% |
| linkall/32bit | 38.410.032 | 38.348.288 | -61.744 = -0,16% |
| linkall/64bit | 40.315.200 | 40.267.344 | -47.856 = -0,12% |
Additionally I've removed the `lazy_map` dictionary, which we populated at
startup and was used to map between Class instances and the corresponding
managed type's FullName, and instead iterate over a native array of Class ->
metadata token mappings whenever we need to look up the managed type for a
certain Class instance.
This is slightly slower for each type we need to look up (for a non-linked app
there might be a 2000-3000 entries in the native array, which would be
iterated instead of using a hashtable lookup), but it's only done once per
type and there's a significant startup memory improvement.
For a non-linked test app I get the following using the Xamarin profiler:
| | Before | After | Diff |
|-------------------|--------:|--------:|----------------:|
| Memory allocated | 2,8 MB | 2,4 MB | -0,4 MB = -14 % |
| Objects allocated | 43678 | 38463 | -5215 = -12 % |
| Private bytes | 26,6 MB | 24,4 MB | -2,2 MB = -8,3% |
| Working set | 26,6 MB | 24,4 MB | -2,2 MB = -8,3% |
Right now the logic exists in a few places, both in and outside the
linker. We recently began to use part of the linker pipeline in normal /
all builds so it's easier to share (and unify) the code now.
The real gain is to avoid copying assemblies, in particular large ones,
more than strictly needed while building.
E.g. a build including a very large 1.3GB assembly, with several
native libraries embedded, save a lot of time avoiding the rewrites
mtouch (before)
Total time: 64202 ms
mtouch (after)
Total time: 34840 ms
* Add XM support for RemoveUserResourcesSubStep
* Tests supplied by @chamons
Run the partial static registrar separately for 32-bit and 64-bit, since this
is required with the upcoming changes to embed metadata tokens inside the
generated output, because the metadata tokens are different between the 32-bit
and 64-bit versions of Xamarin.iOS.dll.
Also make sure to properly resolve the 32-bit and 64-bit assemblies correctly
(by setting the ArchDirectory on the assembly resolver), so that we don't pick
up the reference assembly (which does not have the right metadata tokens).
Additionally stop running the partial static registrar for MonoTouch.Dialog-1,
since with the upcoming changes to use metadata tokens in the generated
output, we won't support registering anything more than once. This shouldn't
make much of an impact, because MonoTouch.Dialog-1 is fairly small, and
doesn't take long to register in the dynamic registrar. For device builds (or
when the static registrar is selected) this has no effect, since in that case
we're registering everythinga anyway.
Rolf Bjarne Kvinge
Chris Hamons
Sebastien Pouliot
Zoltan Varga
Alex Soto
Timothy Risi
Vlad Brezae
Marek Safar
Vincent Dondain
Vincent Dondain