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14 Commits

Author SHA1 Message Date
Eli Friedman 62f3ef2b53 [CGCall] Annotate references with "align" attribute. 
If we're going to assume references are dereferenceable, we should also
assume they're aligned: otherwise, we can't actually dereference them.

See also D80072.

Differential Revision: https://reviews.llvm.org/D80166
 2020-05-19 20:21:30 -07:00
Fangrui Song dbc96b518b Revert "[CodeGenModule] Assume dso_local for -fpic -fno-semantic-interposition" 
This reverts commit 789a46f2d7.

Accidentally committed.
 2020-02-03 10:09:39 -08:00
Fangrui Song 789a46f2d7 [CodeGenModule] Assume dso_local for -fpic -fno-semantic-interposition 
Summary:
Clang -fpic defaults to -fno-semantic-interposition (GCC -fpic defaults
to -fsemantic-interposition).
Users need to specify -fsemantic-interposition to get semantic
interposition behavior.

Semantic interposition is currently a best-effort feature. There may
still be some cases where it is not handled well.

Reviewers: peter.smith, rnk, serge-sans-paille, sfertile, jfb, jdoerfert

Subscribers: dschuff, jyknight, dylanmckay, nemanjai, jvesely, kbarton, fedor.sergeev, asb, rbar, johnrusso, simoncook, sabuasal, niosHD, jrtc27, zzheng, edward-jones, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, arphaman, PkmX, jocewei, jsji, Jim, lenary, s.egerton, pzheng, sameer.abuasal, apazos, luismarques, cfe-commits

Tags: #clang

Differential Revision: https://reviews.llvm.org/D73865
 2020-02-03 09:52:48 -08:00
Martin Storsjö 810b28edb3 [ItaniumCXXABI] Make tls wrappers properly comdat 
Just marking a symbol as weak_odr/linkonce_odr isn't enough for
actually tolerating multiple copies of it at linking on windows,
it has to be made a proper comdat; make it comdat for all platforms
for consistency.

This should hopefully fix
https://bugzilla.mozilla.org/show_bug.cgi?id=1566288.

Differential Revision: https://reviews.llvm.org/D71572
 2020-01-13 23:36:26 +02:00
Manman Ren 5e5d046a4f [TLS on Darwin] use CXX_FAST_TLS calling convention for tls_init. 
This makes sure we don't generate a lot of code to spill/reload
CSRs when calling tls_init from the access functions.

This helps performance when tls_init is not inlined into the access
functions.

llvm-svn: 263854
 2016-03-18 23:35:21 +00:00
Akira Hatanaka 26907f9236 [CodeGen] Attach attributes to thread local wrapper function. 
This commit is a follow-up to r251734, r251476, and r249735, which fixes
a bug where function attributes were not attached to thread local
wrapper functions.

rdar://problem/20828324

llvm-svn: 257865
 2016-01-15 03:34:06 +00:00
Manman Ren b0b3af7dd8 [TLS on Darwin] use CXX_FAST_TLS calling convention for access functions. 
Also set nounwind attribute.

rdar://problem/9001553

llvm-svn: 255860
 2015-12-17 00:42:36 +00:00
Manman Ren 6815026991 [TLS on Darwin] change how we handle globals with linkonce or weak linkage. 
This is about how we handle static member of a template. Before this commit,
we use internal linkage for the IR thread-local variable, which is inefficient.
With this commit, we will start to follow Itanium C++ ABI.

rdar://problem/23415206

Reviewed by John McCall.

llvm-svn: 252814
 2015-11-11 22:42:31 +00:00
David Blaikie fc473554a6 [opaque pointer type] update test cases for explicit pointee types on global aliases 
llvm-svn: 247380
 2015-09-11 03:22:18 +00:00
David Blaikie a953f2825b Update Clang tests to handle explicitly typed load changes in LLVM. 
llvm-svn: 230795
 2015-02-27 21:19:58 +00:00
Hal Finkel a2347baaec Mark C++ reference parameters as dereferenceable 
Because references must be initialized using some evaluated expression, they
must point to something, and a callee can assume the reference parameter is
dereferenceable. Taking advantage of a new attribute just added to LLVM, mark
them as such.

Because dereferenceability in addrspace(0) implies nonnull in the backend, we
don't need both attributes. However, we need to know the size of the object to
use the dereferenceable attribute, so for incomplete types we still emit only
nonnull.

llvm-svn: 213386
 2014-07-18 15:52:10 +00:00
Nick Lewycky 9b46eb8112 Add 'nonnull' parameter or return attribute when producing an llvm pointer type in a function type where the C++ type is a reference. Update the tests. 
llvm-svn: 209723
 2014-05-28 09:56:42 +00:00
Stephen Lin 4362261b00 CHECK-LABEL-ify some code gen tests to improve diagnostic experience when tests fail. 
llvm-svn: 188447
 2013-08-15 06:47:53 +00:00
Richard Smith 2fd1d7aee3 Implement CodeGen for C++11 thread_local, following the Itanium ABI specification as discussed on cxx-abi-dev. 
llvm-svn: 179858
 2013-04-19 16:42:07 +00:00