0a07b6ba8e
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). |
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|---|---|---|
| .. | ||
| xamarin | ||
| .gitignore | ||
| COOP.md | ||
| Delegates.cs.t4 | ||
| EXCEPTIONS.md | ||
| Makefile | ||
| README.md | ||
| bindings-generator.cs | ||
| bindings-generator.csproj | ||
| bindings.h | ||
| bindings.m | ||
| delegates.h.t4 | ||
| delegates.inc.t4 | ||
| delegates.t4 | ||
| exports.t4 | ||
| extension-main.m | ||
| launcher.h | ||
| launcher.m | ||
| libmonotouch.csproj | ||
| libxammac.csproj | ||
| main-internal.h | ||
| mono-runtime.h.t4 | ||
| mono-runtime.m.t4 | ||
| monotouch-debug.h | ||
| monotouch-debug.m | ||
| monotouch-main.m | ||
| monotouch-support.h | ||
| nsstring-localization.m | ||
| product.h | ||
| runtime-internal.h | ||
| runtime.m | ||
| shared.h | ||
| shared.m | ||
| slinked-list.h | ||
| trampolines-i386-asm.s | ||
| trampolines-i386-objc_msgSend-copyframe.inc | ||
| trampolines-i386-objc_msgSend-post.inc | ||
| trampolines-i386-objc_msgSend-pre.inc | ||
| trampolines-i386-objc_msgSend.s | ||
| trampolines-i386-objc_msgSendSuper.s | ||
| trampolines-i386-objc_msgSendSuper_stret.s | ||
| trampolines-i386-objc_msgSend_stret.s | ||
| trampolines-i386.h | ||
| trampolines-i386.m | ||
| trampolines-internal.h | ||
| trampolines-invoke.m | ||
| trampolines-varargs.h | ||
| trampolines-varargs.m | ||
| trampolines-x86_64-asm.s | ||
| trampolines-x86_64-objc_msgSend-copyframe.inc | ||
| trampolines-x86_64-objc_msgSend-post.inc | ||
| trampolines-x86_64-objc_msgSend-pre.inc | ||
| trampolines-x86_64-objc_msgSend.s | ||
| trampolines-x86_64-objc_msgSendSuper.s | ||
| trampolines-x86_64-objc_msgSendSuper_stret.s | ||
| trampolines-x86_64-objc_msgSend_stret.s | ||
| trampolines-x86_64.h | ||
| trampolines-x86_64.m | ||
| trampolines.m | ||
| xamarin-support.m | ||
README.md
Native runtime
This directory contains the native runtime for Xamarin.iOS and Xamarin.Mac.
Cooperative GC
See COOP.md
Generated code
A few files are generated automatically:
delegates.h|inc, Delegates.cs
These files contain the code required to glue the native runtime and the managed runtime.
mono-runtime.m, xamarin/mono-runtime.h
These files contain code that makes other code, consumers of the mono runtime, oblivious to whether the mono runtime is linked statically, dynamically, or using dlopen at runtime.
If you need to use a new function from the Mono headers, add it to exports.t4.
If you need a new enum / constant / typedef / etc, add it to mono-runtime.h.t4.
Shipped headers
These are the headers shipped with XI/XM (they're not for public consumption, but we need them to build generated code on customers machine, in particular main.m and registrar.m)
xamarin/runtime.h xamarin/trampolines.h xamarin/main.h xamarin/xamarin.h