steven_wu (Steven Wu)
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User Since
Nov 4 2014, 3:46 PM (189 w, 21 h)

Recent Activity

Wed, Jun 13

steven_wu accepted D48108: Handle an Xcode path with spaces in it.

LGTM.

Wed, Jun 13, 9:59 AM

Mon, Jun 11

steven_wu added a comment to D47994: [Darwin] Do not error on '-lto_library' option.

I am not working on lld but this looks good for me. I like this solution better than the alternative you mentioned.

Mon, Jun 11, 9:37 AM

Wed, May 23

steven_wu committed rL333148: [Sema][ObjC] Do not DiagnoseUseOfDecl in LookupMemberExpr.
[Sema][ObjC] Do not DiagnoseUseOfDecl in LookupMemberExpr
Wed, May 23, 6:06 PM
steven_wu committed rC333148: [Sema][ObjC] Do not DiagnoseUseOfDecl in LookupMemberExpr.
[Sema][ObjC] Do not DiagnoseUseOfDecl in LookupMemberExpr
Wed, May 23, 6:06 PM
steven_wu closed D47280: [Sema][ObjC] Do not DiagnoseUseOfDecl in LookupMemberExpr.
Wed, May 23, 6:05 PM
steven_wu created D47280: [Sema][ObjC] Do not DiagnoseUseOfDecl in LookupMemberExpr.
Wed, May 23, 1:44 PM

May 14 2018

steven_wu added a comment to D46858: Signal handling should be signal-safe.

I think it is easier to unregister all the signal handlers in the beginning of the llvm_shutdown() since you should be done with all the work when you call llvm_shutdown(). This can also allow safe access ManagedStatics in signal handler, which I don't know if we have more of those other than the lock you are trying to fix. The only difference might be that if an interrupt is triggered when freeing ManagedStatics, llvm signal handler will not be used.

May 14 2018, 6:46 PM

May 10 2018

steven_wu accepted D45930: [Support] Upstream anonymization and manipulating of BCSymbolMaps.

Are you planning to upstream the module pass to justify this to be part of Support library?

May 10 2018, 8:27 AM

Apr 23 2018

steven_wu added a comment to D45930: [Support] Upstream anonymization and manipulating of BCSymbolMaps.

Thanks for working on this Jonas. Duncan and Adrian has already covered pretty much all I want to say. A small additional comments.

Apr 23 2018, 9:28 AM

Apr 19 2018

steven_wu committed rL330338: [CXX] Templates specialization visibility can be wrong.
[CXX] Templates specialization visibility can be wrong
Apr 19 2018, 8:52 AM
steven_wu committed rC330338: [CXX] Templates specialization visibility can be wrong.
[CXX] Templates specialization visibility can be wrong
Apr 19 2018, 8:52 AM
steven_wu closed D44670: [CXX] Templates specialization visibility can be wrong.
Apr 19 2018, 8:52 AM
steven_wu closed D44670: [CXX] Templates specialization visibility can be wrong.
Apr 19 2018, 8:52 AM

Apr 18 2018

steven_wu added inline comments to D44670: [CXX] Templates specialization visibility can be wrong.
Apr 18 2018, 10:30 AM
steven_wu added a reviewer for D44670: [CXX] Templates specialization visibility can be wrong: doug.gregor.
Apr 18 2018, 10:29 AM
steven_wu updated the diff for D44670: [CXX] Templates specialization visibility can be wrong.

Address review feedback

Apr 18 2018, 10:29 AM

Apr 16 2018

steven_wu committed rL330166: [Availability] Improve availability to consider functions run at load time.
[Availability] Improve availability to consider functions run at load time
Apr 16 2018, 4:37 PM
steven_wu committed rC330166: [Availability] Improve availability to consider functions run at load time.
[Availability] Improve availability to consider functions run at load time
Apr 16 2018, 4:37 PM
steven_wu closed D45699: [Availability] Improve availability to consider functions run at load time.
Apr 16 2018, 4:37 PM
steven_wu updated the diff for D45699: [Availability] Improve availability to consider functions run at load time.

Address review feedback

Apr 16 2018, 4:35 PM
steven_wu added a reviewer for D45699: [Availability] Improve availability to consider functions run at load time: erik.pilkington.
Apr 16 2018, 4:05 PM
steven_wu updated the diff for D45699: [Availability] Improve availability to consider functions run at load time.

Address review feedback. Fix typos and comments.

Apr 16 2018, 3:59 PM
steven_wu added a comment to D45699: [Availability] Improve availability to consider functions run at load time.

Thanks for reviewing Erik!

Apr 16 2018, 3:54 PM
steven_wu created D45699: [Availability] Improve availability to consider functions run at load time.
Apr 16 2018, 2:10 PM

Apr 10 2018

steven_wu committed rL329752: [MachO] Emit Weak ReadOnlyWithRel to ConstDataSection.
[MachO] Emit Weak ReadOnlyWithRel to ConstDataSection
Apr 10 2018, 1:19 PM
This revision was not accepted when it landed; it landed in state Needs Review.
Apr 10 2018, 1:19 PM

Apr 9 2018

steven_wu created D45472: [MachO] Emit Weak ReadOnlyWithRel to ConstDataSection.
Apr 9 2018, 6:41 PM

Mar 30 2018

steven_wu accepted D45076: Prevent data races in concurrent ThinLTO processes.

LGTM. Thanks!

Mar 30 2018, 1:52 PM
steven_wu added a comment to D45076: Prevent data races in concurrent ThinLTO processes.

LGTM with some feedback inline.

Mar 30 2018, 10:31 AM

Mar 21 2018

steven_wu added a comment to D44753: [Preprocessor] Rename __is_{target -> host}_* function-like builtin macros.

I am not trying to discuss which english word is best here. My point is simply:

  1. macros are evaluated during compile time
  2. "host"means either the platform you compiled on during compile time or the platform you run on during the runtime
  3. __is_host_* is not a good name, because it is misleading as it either implies "runtime" as a compile-time constant, or indicates the wrong platform.
Mar 21 2018, 3:40 PM
steven_wu added a comment to D44753: [Preprocessor] Rename __is_{target -> host}_* function-like builtin macros.

It is not about matching command line name to builtin marco name. "target" is the platform we are compiling for, whether it is host or device or something else. It is a different concept when you talking about cross-compiling, which "target" is strictly not host and "build" or "host" doesn't matter to compiler at all.

Mar 21 2018, 2:55 PM
steven_wu added a comment to D44753: [Preprocessor] Rename __is_{target -> host}_* function-like builtin macros.

I disagree. I think "target" is the correct name, even for cross compiling. For something compiled with -target foo, we are consistent calling it "target" during compile time. It only becomes appropriate to call it "host" during the runtime of the executable. There is no such concept as "host" when you are doing cross compiling.

Mar 21 2018, 2:34 PM

Mar 19 2018

steven_wu abandoned D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.
Mar 19 2018, 7:16 PM
steven_wu created D44670: [CXX] Templates specialization visibility can be wrong.
Mar 19 2018, 7:08 PM

Mar 15 2018

steven_wu added a comment to D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.

If we all agree that dropping local_unnamed_addr is invalid, I can abandon this. Thanks for the feedback!

Mar 15 2018, 6:29 PM
steven_wu added a comment to D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.

I might have missed something. Can you be more specific about how it is going to work?

Mar 15 2018, 5:02 PM
steven_wu added a comment to D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.

The solution is to use canBeOmittedFromSymbolTable from include/llvm/Object/IRSymtab.h.

The symbol table is computed earlier and so the above predicate still returns 1. Your examples work with lld and ThinLTO if you want to check the implementation details.

Mar 15 2018, 4:39 PM
steven_wu added a comment to D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.

So the original of this patch is thinLTO is promoting linkonce_odr to weak_odr. Think the following two situations:

Mar 15 2018, 4:01 PM

Mar 13 2018

steven_wu added a comment to D44373: Fix reading objects created with -fembed-bitcode-marker..

Additional comment, I didn't realize llvm-nm now prioritize to print bitcode symbol table, rather than the symbol table from the object file. There should be an option to choose which one to see and maybe also an option to see both.

Mar 13 2018, 11:31 AM
steven_wu accepted D44373: Fix reading objects created with -fembed-bitcode-marker..
Mar 13 2018, 10:39 AM
steven_wu added a comment to D44373: Fix reading objects created with -fembed-bitcode-marker..

Thanks for fixing this. LGTM.

Mar 13 2018, 10:39 AM

Mar 1 2018

steven_wu added a comment to D43959: [asan] Fix a false positive ODR violation due to LTO ConstantMerge pass.

Thanks, yes, AFAIK, ld64 is fine and I don't really know how to test lld on Darwin (is it even supposed to work?).

Mar 1 2018, 11:13 AM · Restricted Project
steven_wu accepted D43959: [asan] Fix a false positive ODR violation due to LTO ConstantMerge pass.

The idea is to prevent LTO (ConstMerge pass) from merging global constants that has the same value, which has the same side-effect as linker merging two weak symbols that has ODR violation.

Mar 1 2018, 10:54 AM · Restricted Project

Feb 28 2018

steven_wu accepted D42446: [ThinLTO] Add a couple of more knobs to C API to control cache size..

LGTM. And yes, order doesn't matter.

Feb 28 2018, 4:22 PM

Feb 26 2018

steven_wu added a comment to D42446: [ThinLTO] Add a couple of more knobs to C API to control cache size..

The API change is fine for ld64. But you need to do the following when you update LTO C API:

  • You need to declare the interface in include/llvm-c/lto.h
  • You need to bump LTO_API_VERSION in that header and document the new API is available since the new LTO_API_VERSION.
  • You need to update tools/lto/lto.exports. This is the export list used by ld64 and only the interface listed in that file will be exported on darwin platform.
Feb 26 2018, 5:11 PM

Feb 19 2018

steven_wu committed rL325525: bitcode support change for fast flags compatibility.
bitcode support change for fast flags compatibility
Feb 19 2018, 11:24 AM
steven_wu closed D43253: bitcode support change for fast flags compatibility.
Feb 19 2018, 11:24 AM
steven_wu accepted D43253: bitcode support change for fast flags compatibility.

Michael doesn't have commit right yet so I will commit this for him.

Feb 19 2018, 11:17 AM

Feb 16 2018

steven_wu added a comment to D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.

I am using local_unnamed_addr as an example. Maybe you are right but I think my point is still valid. That is, LTO optimization and code generation can modify the symbol table from the bitcode file. It is already the case that symbols can be internalized, removed, backend can also insert new symbols. Unless there is a rule saying LTO passes cannot modify the linkage or visibility or any other attributes to the symbols, linker cannot trust whatever the bitcode symbol table says and firmly it will not be changed for some good reason.

Feb 16 2018, 12:07 PM
steven_wu added a comment to D43253: bitcode support change for fast flags compatibility.

I think this approach is much better. Can you update the title because it is not really a version bump anymore? From my understanding, this is good enough for backwards-compatibility. Thanks!

Feb 16 2018, 10:20 AM
steven_wu added a comment to D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.
In D43361#1009616, @pcc wrote:

There is an alternative which is to teach linker to deduct auto hide property from the bitcode file and overwrite the linkage type afterwards. For C API, there is a new scope LTO_SYMBOL_SCOPE_DEFAULT_CAN_BE_HIDDEN can be used to do that but that will be forced the work onto all the linker which is probably not desirable but it solves the same problem.

This seems better to me. Ideally the linker should be reading and resolving symbols from bitcode files in the same way as regular object files, including the auto-hide bit. Linkers would need something similar for any other properties that are contained only in bitcode files but not in object files (such as a general address-taken bit).

Feb 16 2018, 9:46 AM

Feb 15 2018

steven_wu added a comment to D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.
In D43361#1009486, @pcc wrote:

The last time this was attempted (D28978) we established that the linker can do this itself. I don't think the situation has changed since then.

Feb 15 2018, 4:22 PM
steven_wu created D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.
Feb 15 2018, 3:28 PM
steven_wu added a dependent revision for D43360: [Bitcode] Add UnnamedAddr attributes to GlobalValueSummary: D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.
Feb 15 2018, 3:28 PM
steven_wu added a dependency for D43361: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr: D43360: [Bitcode] Add UnnamedAddr attributes to GlobalValueSummary.
Feb 15 2018, 3:28 PM
steven_wu created D43360: [Bitcode] Add UnnamedAddr attributes to GlobalValueSummary.
Feb 15 2018, 3:25 PM
steven_wu abandoned D43358: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.

Generated by mistake. Abandon and I will reformat the patch.

Feb 15 2018, 3:24 PM
steven_wu created D43358: [ThinLTO] Enable AutoHide on symbols with local_unnamed_addr.
Feb 15 2018, 3:21 PM

Feb 9 2018

steven_wu created D43139: [GlobalOpts] mark linkonce_odr unnamed_addr GV as hidden.
Feb 9 2018, 12:37 PM
steven_wu committed rL324757: [ThinLTO] Teach ThinLTO about auto hide symbols.
[ThinLTO] Teach ThinLTO about auto hide symbols
Feb 9 2018, 10:36 AM
steven_wu closed D43130: [ThinLTO] Teach ThinLTO about auto hide symbols.
Feb 9 2018, 10:36 AM
steven_wu updated the diff for D43130: [ThinLTO] Teach ThinLTO about auto hide symbols.

Move the check later so it is only check when needed.

Feb 9 2018, 10:31 AM
steven_wu created D43130: [ThinLTO] Teach ThinLTO about auto hide symbols.
Feb 9 2018, 10:12 AM

Feb 6 2018

steven_wu added a comment to D42267: [ThinLTO] Allow 0 to be a valid value for pruning interval for C LTO API..

I am definitely not against the change. It would be good to have the number means the same thing in C/C++ API. I think ld64 can be updated in advance before we release 7.0 so we can have a larger compatibility window so I don't think this should be a blocker.

So, can I assume that I got an "OK" from the other main stakeholder who is using C LTO API? BTW, I CC-ed you to another small patch https://reviews.llvm.org/D42446, where I added a couple of missing APIs for controlling cache policy. You might want to expose it to ld64 users.

Feb 6 2018, 4:22 PM
steven_wu added a comment to D42267: [ThinLTO] Allow 0 to be a valid value for pruning interval for C LTO API..

This indeed affects how ld64 interact with libLTO. If user didn't specify a value, ld64 will always call thinlto_codegen_set_cache_pruning_interval with interval 0. This is currently a no-op so it will use whatever the default value in libLTO. With this change, it will be force pruning.

It is possible for us to make change to future ld64 to use different value but it is not going work very well for compatibility. If old ld64 loaded a new libLTO, it is going to lose incremental build.

Well, the main reason for this change was:

(a) compatibility with C++ API. A lot of code in libLTO is common for C API and C++ API. Having the same semantics for the same options in two different APIs will make code simpler and prevents from someone who only cares about C+ API to unintentionally break the C API functionality. The latter is particularly important, since incremental linking is not thoroughly tested.

(b) giving a possibility to a user to run a pruner immediately, vs. "no-op" which could get achieved simply by not passing "pruning-interval" option to the linker, making option value 0 useless.

I understand your compatibility issue, but I don't think it's very serious.

  • I doubt it's common for a user to pass a option to the linker, if the same effect could be achieved by not passing any option at all (why would user do extra work?).
  • This option will cause the pruner to run, which not necessarily means that the cache files will get removed and incremental build won't happen. Cache files will get removed only if at the same time the files are stale, or their sizes are larger then certain thresholds, which are passed as parameters.
  • The pruner runs just 20 minutes earlier than it would have run by default. So, only the builds that are done more frequent than 20 minutes might be affected.
  • Only the users who pick up the linker and libLTO from different packages will get affected.

    Let me know what you decide. If you want to keep things the old way, I could modify this patch for PS4 only.

    So, to summarize, we could add a meaningful value for pruning_interval option, which currently can't get achieved otherwise, and additionally we will offer compatibility with C++API. The only users that will be affected are the ones who because of whatever reason decided to explicitly specify a default option on the command line rather than skipping it, whose builds are happening more frequently than 20 minutes and who had mixed and matched different releases of ld64 and libLTO.
Feb 6 2018, 3:39 PM
steven_wu added a comment to D42267: [ThinLTO] Allow 0 to be a valid value for pruning interval for C LTO API..

This indeed affects how ld64 interact with libLTO. If user didn't specify a value, ld64 will always call thinlto_codegen_set_cache_pruning_interval with interval 0. This is currently a no-op so it will use whatever the default value in libLTO. With this change, it will be force pruning.

Feb 6 2018, 1:46 PM

Jan 5 2018

steven_wu committed rL321909: Preserve unknown STDC pragma through preprocessor.
Preserve unknown STDC pragma through preprocessor
Jan 5 2018, 2:46 PM
steven_wu committed rC321909: Preserve unknown STDC pragma through preprocessor.
Preserve unknown STDC pragma through preprocessor
Jan 5 2018, 2:46 PM
steven_wu closed D41780: Preserve unknown STDC pragma through preprocessor.
Jan 5 2018, 2:46 PM
steven_wu updated the diff for D41780: Preserve unknown STDC pragma through preprocessor.

Move STDC pragma handler to parser.

Jan 5 2018, 2:02 PM
steven_wu added a comment to D41780: Preserve unknown STDC pragma through preprocessor.

If you move all the #pragma STDC handlers from the lexer to the parser, you might be able to avoid adding an explicit STDC handler in PrintPreprocessedOutput.cpp.

Jan 5 2018, 11:46 AM
steven_wu updated the summary of D41780: Preserve unknown STDC pragma through preprocessor.
Jan 5 2018, 11:19 AM
steven_wu created D41780: Preserve unknown STDC pragma through preprocessor.
Jan 5 2018, 11:17 AM

Dec 19 2017

steven_wu added inline comments to D41425: [darwin][driver] Warn about mismatching -<os>-version-min rather than superfluous -<os>-version-min compiler option.
Dec 19 2017, 6:13 PM
steven_wu accepted D41425: [darwin][driver] Warn about mismatching -<os>-version-min rather than superfluous -<os>-version-min compiler option.

Just a small suggestion. Looks good otherwise.

Dec 19 2017, 6:07 PM

Dec 15 2017

steven_wu accepted D41076: [driver][darwin] Set the 'simulator' environment when it's specified in '-target'.
Dec 15 2017, 4:12 PM
steven_wu added a comment to D41076: [driver][darwin] Set the 'simulator' environment when it's specified in '-target'.

Other than the comment inline, LGTM.

Dec 15 2017, 4:11 PM

Dec 13 2017

steven_wu accepted D41087: [Preprocessor] Implement __is_target_{arch|vendor|os|environment} function-like builtin macros.

LGTM

Dec 13 2017, 3:46 PM

Dec 8 2017

steven_wu added a comment to D41035: [driver][darwin] Refactor the target selection code, NFC.

LGTM.

Dec 8 2017, 5:30 PM

Nov 9 2017

steven_wu committed rL317860: [Driver] Make clang/cc conforms to UNIX standard.
[Driver] Make clang/cc conforms to UNIX standard
Nov 9 2017, 5:33 PM
steven_wu closed D39502: [Driver] Make clang/cc conforms to UNIX standard by committing rL317860: [Driver] Make clang/cc conforms to UNIX standard.
Nov 9 2017, 5:32 PM
steven_wu updated the diff for D39502: [Driver] Make clang/cc conforms to UNIX standard.

Add more tests! The new tests can trigger two errors during the compilation
but only one should be emitted.

Nov 9 2017, 5:05 PM
steven_wu updated the diff for D39502: [Driver] Make clang/cc conforms to UNIX standard.

I think I understand what you mean now. You want some cases when the
compilation doesn't failed on the first source it process.

Nov 9 2017, 4:49 PM
steven_wu added inline comments to D39502: [Driver] Make clang/cc conforms to UNIX standard.
Nov 9 2017, 4:35 PM

Nov 6 2017

steven_wu updated the diff for D39502: [Driver] Make clang/cc conforms to UNIX standard.

Update testcase for CUDA driver

Nov 6 2017, 5:26 PM
steven_wu added inline comments to D39502: [Driver] Make clang/cc conforms to UNIX standard.
Nov 6 2017, 5:16 PM
steven_wu added inline comments to D39502: [Driver] Make clang/cc conforms to UNIX standard.
Nov 6 2017, 4:52 PM
steven_wu updated the diff for D39502: [Driver] Make clang/cc conforms to UNIX standard.

Improve testcase according to review feedback.

Nov 6 2017, 3:45 PM
steven_wu added a comment to D39502: [Driver] Make clang/cc conforms to UNIX standard.
In D39502#917132, @tra wrote:

Also, the reason I don't know how to craft a testcase is not because I have
trouble with CUDA driver, but how to write a test to check when did the driver
bailed out. Let me know if you have any suggestions.

Here's one way to do it: Run 'cc -v', positively match cc1 invocations that worked and CHECK-NOT for cc1 invocations that would happen after bail-out point.
Use preprocessor to induce the failure during particular compilation phase:

# if __CUDA_ARCH__ == 350
#error Error during compilation for sm_35
#endif

#ifndef __CUDA_ARCH__
#error Error during host compilation
#endif
Nov 6 2017, 2:50 PM
steven_wu updated the diff for D39502: [Driver] Make clang/cc conforms to UNIX standard.

Add testcase for CUDA driver

Nov 6 2017, 2:49 PM
steven_wu updated the diff for D39502: [Driver] Make clang/cc conforms to UNIX standard.

This seems to be the cleanest solution I can find for CUDA without
touching the job configuration for CUDA. My proposed fix is to bail
out of the jobs that are parts of CUDA offload if some command failed
before that. Now if you hit failures when compiling multiple GPU
architectures, you will error out only once. This is pretty much the exact
same behavior of current driver.

Nov 6 2017, 1:40 PM
steven_wu added a comment to D39502: [Driver] Make clang/cc conforms to UNIX standard.

Note the host clang side has the inputs "test.cu" and "test-c3378c.fatbin". Which means if the device side compilation failed, the host side will not compile because InputOk will return false in this case

The patch handles this case correctly, thank you.

Unfortunately it's a bit more complicated than this. You can pass --cuda-gpu-arch=XXX multiple times when invoking clang, and that will result in multiple compilations for different GPU architectures. In this case we want to fail when the first one fails, on the theory that (most of the time) all compilations will have the same errors.

You can test this with e.g.

$ clang -x cuda test.cu -nocudalib -nocudainc --cuda-gpu-arch=sm_35 --cuda-gpu-arch=sm_60

With this patch, clang prints the errors twice, once for sm_35 and once for sm_60. Without the patch, it only prints one set of errors, which is the expected behavior.

Nov 6 2017, 8:42 AM

Nov 2 2017

steven_wu added a comment to D39356: [ThinLTO] Fix missing call graph edges for calls with bitcasts..
Nov 2 2017, 4:58 PM
steven_wu updated the diff for D39502: [Driver] Make clang/cc conforms to UNIX standard.

Fix testcase. My test was passing because files left over from previous run.
Now it should work with a clean build.

Nov 2 2017, 4:41 PM
steven_wu added a reviewer for D39502: [Driver] Make clang/cc conforms to UNIX standard: tra.
Nov 2 2017, 4:13 PM
steven_wu updated the diff for D39502: [Driver] Make clang/cc conforms to UNIX standard.

Address review feedback.

Nov 2 2017, 4:01 PM

Nov 1 2017

steven_wu committed rL317153: [X86] Fix fast-isel-int-float-conversion test.
[X86] Fix fast-isel-int-float-conversion test
Nov 1 2017, 6:34 PM
steven_wu added a comment to D39502: [Driver] Make clang/cc conforms to UNIX standard.

More background here that doesn't fit in the commit message.

Nov 1 2017, 1:07 PM
steven_wu created D39502: [Driver] Make clang/cc conforms to UNIX standard.
Nov 1 2017, 12:57 PM

Sep 15 2017

steven_wu added a comment to D37909: [AutoUpgrade] Fix a compatibility issue with module flag.

Thanks Hans. Yes, it will be good to pick this up for 5.0.1

Sep 15 2017, 2:38 PM