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llvm-mirror/test/Feature
Rafael Espindola d15cd32b9f Remove the linker_private and linker_private_weak linkages.
These linkages were introduced some time ago, but it was never very
clear what exactly their semantics were or what they should be used
for. Some investigation found these uses:

* utf-16 strings in clang.
* non-unnamed_addr strings produced by the sanitizers.

It turns out they were just working around a more fundamental problem.
For some sections a MachO linker needs a symbol in order to split the
section into atoms, and llvm had no idea that was the case. I fixed
that in r201700 and it is now safe to use the private linkage. When
the object ends up in a section that requires symbols, llvm will use a
'l' prefix instead of a 'L' prefix and things just work.

With that, these linkages were already dead, but there was a potential
future user in the objc metadata information. I am still looking at
CGObjcMac.cpp, but at this point I am convinced that linker_private
and linker_private_weak are not what they need.

The objc uses are currently split in

* Regular symbols (no '\01' prefix). LLVM already directly provides
whatever semantics they need.
* Uses of a private name (start with "\01L" or "\01l") and private
linkage. We can drop the "\01L" and "\01l" prefixes as soon as llvm
agrees with clang on L being ok or not for a given section. I have two
patches in code review for this.
* Uses of private name and weak linkage.

The last case is the one that one could think would fit one of these
linkages. That is not the case. The semantics are

* the linker will merge these symbol by *name*.
* the linker will hide them in the final DSO.

Given that the merging is done by name, any of the private (or
internal) linkages would be a bad match. They allow llvm to rename the
symbols, and that is really not what we want. From the llvm point of
view, these objects should really be (linkonce|weak)(_odr)?.

For now, just keeping the "\01l" prefix is probably the best for these
symbols. If we one day want to have a more direct support in llvm,
IMHO what we should add is not a linkage, it is just a hidden_symbol
attribute. It would be applicable to multiple linkages. For example,
on weak it would produce the current behavior we have for objc
metadata. On internal, it would be equivalent to private (and we
should then remove private).

llvm-svn: 203866
2014-03-13 23:18:37 +00:00
..
aliases.ll Reject alias to undefined symbols in the verifier. 2014-03-12 20:15:49 +00:00
alignment.ll
attributes.ll Modify the LLVM assembly output so that it uses references to represent function attributes. 2013-02-20 07:21:42 +00:00
basictest.ll
callingconventions.ll
calltest.ll
casttest.ll
cfgstructures.ll
cold.ll Add a new function attribute 'cold' to functions. 2013-05-24 12:26:52 +00:00
const_pv.ll There was a switch fall-through in the parser for textual LLVM that caused 2013-01-07 13:32:38 +00:00
constexpr.ll
constpointer.ll
escaped_label.ll
exception.ll
float.ll The powers that be have decided that LLVM IR should now support 16-bit 2011-12-17 00:04:22 +00:00
fold-fpcast.ll
forwardreftest.ll
global_pv.ll Tests: rewrite 'opt ... %s' to 'opt ... < %s' so that opt does not emit a ModuleID 2012-12-30 02:33:22 +00:00
global_section.ll
globalredefinition3.ll Convert the uses of '|&' to use '2>&1 |' instead, which works on old 2012-07-02 18:37:59 +00:00
globalvars.ll
indirectcall2.ll
indirectcall.ll
inlineasm.ll
instructions.ll
intrinsics.ll Change math intrinsic attributes from readonly to readnone. These 2014-03-06 00:18:15 +00:00
load_module.ll Remove "lto_on_osx" xfails, now that -rdynamic works on Darwin. 2013-08-04 23:55:24 +00:00
md_on_instruction.ll Debug Info: update testing cases to specify the debug info version number. 2013-11-23 01:16:29 +00:00
memorymarkers.ll
metadata.ll
minsize_attr.ll Modify the LLVM assembly output so that it uses references to represent function attributes. 2013-02-20 07:21:42 +00:00
NamedMDNode2.ll
NamedMDNode.ll
newcasts.ll Add addrspacecast instruction. 2013-11-15 01:34:59 +00:00
optnone-opt.ll Disable most IR-level transform passes on functions marked 'optnone'. 2014-02-06 00:07:05 +00:00
optnone.ll The 'optnone' attribute means don't inline anything into this function 2013-11-18 21:44:03 +00:00
packed_struct.ll Convert all tests using TCL-style quoting to use shell-style quoting. 2012-07-02 12:47:22 +00:00
packed.ll
paramattrs.ll
ppcld.ll
prefixdata.ll Implement function prefix data as an IR feature. 2013-09-16 01:08:15 +00:00
properties.ll Remove the dependent libraries feature. 2012-11-27 09:55:56 +00:00
prototype.ll
README.txt
recursivetype.ll
simplecalltest.ll
small.ll
smallest.ll
sparcld.ll
terminators.ll
testalloca.ll
testconstants.ll
testlogical.ll
testtype.ll
testvarargs.ll
undefined.ll
unreachable.ll
varargs_new.ll
varargs.ll
vector-cast-constant-exprs.ll Convert all tests using TCL-style quoting to use shell-style quoting. 2012-07-02 12:47:22 +00:00
weak_constant.ll
weirdnames.ll
x86ld.ll

This directory contains test cases for individual source features of LLVM.
It is designed to make sure that the major components of LLVM support all of the
features of LLVM, for very small examples.  Entire programs should not go here.

Regression tests for individual bug fixes should go into the test/Regression dir.