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Author SHA1 Message Date
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
Richard Smith a271686ce2 PR30937: don't devirtualize if we find that the callee is a pure virtual 
function. In that case, there is no requirement that the callee is actually
defined, and the code may in fact be valid and have defined behavior if the
virtual call is unreachable.

llvm-svn: 286534
 2016-11-11 01:01:31 +00:00
Richard Smith 018ac39f94 Improve obvious-most-derived-type devirtualization: 
* if the base is produced by a series of derived-to-base conversions, check
    the expression inside them when looking for an expression with a known
    dynamic type
  * step past MaterializeTemporaryExprs when checking for a known dynamic type
  * when checking for a known dynamic type, treat all class prvalues as having
    a known dynamic type after skipping all relevant rvalue subobject
    adjustments
  * treat callees formed by pointer-to-member access for a non-reference member
    type like callees formed by member access.

llvm-svn: 285954
 2016-11-03 18:55:18 +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
David Blaikie 60761490f2 Provide fixed target triples to make test results consistent across ARM hosts. 
Patch by David Tweed, review by myself and John McCall.

llvm-svn: 163564
 2012-09-10 23:06:08 +00:00
Richard Smith 48c15319f7 Devirtualize calls on glvalues produced by class member access expressions. 
Based on a patch by Yin Ma!

llvm-svn: 161998
 2012-08-15 22:59:28 +00:00
Rafael Espindola a245edc82f Fix a crash I introduced in r159212. 
llvm-svn: 159279
 2012-06-27 17:44:39 +00:00
Rafael Espindola 727a771a5f Fix a bug in my previous patch: If we are not doing a virtual call because 
the member expression is qualified, call the method specified in the code,
not the most derived one we can find.

llvm-svn: 159219
 2012-06-26 19:18:25 +00:00
Anders Carlsson c53d9e8350 Strip off parens and no-op casts when deciding if an expr can be devirtualized. Fixes the second half of PR9660. 
llvm-svn: 129253
 2011-04-10 18:20:53 +00:00
Daniel Dunbar 8fbe78f6fc Update tests to use %clang_cc1 instead of 'clang-cc' or 'clang -cc1'. 
- This is designed to make it obvious that %clang_cc1 is a "test variable"
   which is substituted. It is '%clang_cc1' instead of '%clang -cc1' because it
   can be useful to redefine what gets run as 'clang -cc1' (for example, to set
   a default target).

llvm-svn: 91446
 2009-12-15 20:14:24 +00:00
Anders Carlsson a1b54fdbe1 Even more devirtualization cleverness. 
llvm-svn: 83886
 2009-10-12 19:59:15 +00:00
Anders Carlsson 2a01709204 More devirtualization improvements. 
llvm-svn: 83883
 2009-10-12 19:51:33 +00:00
Anders Carlsson b61301f353 Devirtualize calls on temporaries. A().f() for example. 
llvm-svn: 83882
 2009-10-12 19:45:47 +00:00
Anders Carlsson d7432dfb0a Factor out devirtualization checking into a separate function and make it handle references correctly. 
llvm-svn: 83880
 2009-10-12 19:41:04 +00:00