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Peter Collingbourne 5dcb77e9fb IR: Introduce local_unnamed_addr attribute. 
If a local_unnamed_addr attribute is attached to a global, the address
is known to be insignificant within the module. It is distinct from the
existing unnamed_addr attribute in that it only describes a local property
of the module rather than a global property of the symbol.

This attribute is intended to be used by the code generator and LTO to allow
the linker to decide whether the global needs to be in the symbol table. It is
possible to exclude a global from the symbol table if three things are true:
- This attribute is present on every instance of the global (which means that
  the normal rule that the global must have a unique address can be broken without
  being observable by the program by performing comparisons against the global's
  address)
- The global has linkonce_odr linkage (which means that each linkage unit must have
  its own copy of the global if it requires one, and the copy in each linkage unit
  must be the same)
- It is a constant or a function (which means that the program cannot observe that
  the unique-address rule has been broken by writing to the global)

Although this attribute could in principle be computed from the module
contents, LTO clients (i.e. linkers) will normally need to be able to compute
this property as part of symbol resolution, and it would be inefficient to
materialize every module just to compute it.

See:
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160509/356401.html
http://lists.llvm.org/pipermail/llvm-commits/Week-of-Mon-20160516/356738.html
for earlier discussion.

Part of the fix for PR27553.

Differential Revision: http://reviews.llvm.org/D20348

llvm-svn: 272709
2016-06-14 21:01:22 +00:00
..
2002-03-08-NameCollision2.ll
2002-03-08-NameCollision.ll
2002-04-07-HexFloatConstants.ll
2002-04-07-InfConstant.ll
2002-04-29-NameBinding.ll
2002-05-02-InvalidForwardRef.ll
2002-07-14-OpaqueType.ll
2002-07-25-QuoteInString.ll
2002-07-25-ReturnPtrFunction.ll
2002-07-31-SlashInString.ll
2002-08-15-CastAmbiguity.ll
2002-08-15-ConstantExprProblem.ll
2002-08-15-UnresolvedGlobalReference.ll
2002-08-16-ConstExprInlined.ll
2002-08-19-BytecodeReader.ll
2002-08-22-DominanceProblem.ll
2002-10-08-LargeArrayPerformance.ll
2002-10-13-ConstantEncodingProblem.ll
2002-12-15-GlobalResolve.ll
2003-01-30-UnsignedString.ll
2003-04-15-ConstantInitAssertion.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2003-04-25-UnresolvedGlobalReference.ll
2003-05-03-BytecodeReaderProblem.ll
2003-05-12-MinIntProblem.ll
2003-05-15-AssemblerProblem.ll
2003-05-15-SwitchBug.ll
2003-05-21-ConstantShiftExpr.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2003-05-21-EmptyStructTest.ll
2003-05-21-MalformedShiftCrash.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2003-05-21-MalformedStructCrash.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2003-08-20-ConstantExprGEP-Fold.ll
2003-08-21-ConstantExprCast-Fold.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2003-11-05-ConstantExprShift.ll
2003-11-11-ImplicitRename.ll
2003-11-12-ConstantExprCast.ll
2003-11-24-SymbolTableCrash.ll
2004-01-11-getelementptrfolding.ll
2004-01-20-MaxLongLong.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2004-02-01-NegativeZero.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2004-02-27-SelfUseAssertError.ll
2004-03-07-FunctionAddressAlignment.ll
2004-03-30-UnclosedFunctionCrash.ll
2004-04-04-GetElementPtrIndexTypes.ll
2004-06-07-VerifierBug.ll
2004-10-22-BCWriterUndefBug.ll
2004-11-28-InvalidTypeCrash.ll
2005-01-03-FPConstantDisassembly.ll
2005-01-31-CallingAggregateFunction.ll
2005-05-05-OpaqueUndefValues.ll
2005-12-21-ZeroInitVector.ll
2006-09-28-CrashOnInvalid.ll
2006-12-09-Cast-To-Bool.ll
2007-01-02-Undefined-Arg-Type.ll
2007-01-05-Cmp-ConstExpr.ll
2007-01-16-CrashOnBadCast2.ll
2007-01-16-CrashOnBadCast.ll
2007-03-18-InvalidNumberedVar.ll
2007-03-19-NegValue.ll
2007-04-20-AlignedLoad.ll
2007-04-20-AlignedStore.ll
2007-04-25-AssemblerFoldExternWeak.ll
2007-05-21-Escape.ll
2007-07-19-ParamAttrAmbiguity.ll
2007-08-06-AliasInvalid.ll
2007-09-10-AliasFwdRef.ll
2007-09-29-GC.ll
2007-11-26-AttributeOverload.ll
2007-12-11-AddressSpaces.ll
2008-01-11-VarargAttrs.ll
2008-02-18-IntPointerCrash.ll
2008-07-10-APInt.ll
2008-09-02-FunctionNotes2.ll
2008-09-02-FunctionNotes.ll
2008-09-29-RetAttr.ll
2008-10-14-QuoteInName.ll
2009-02-01-UnnamedForwardRef.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
2009-02-28-CastOpc.ll
2009-02-28-StripOpaqueName.ll
2009-03-24-ZextConstantExpr.ll
2009-07-24-ZeroArgGEP.ll
2010-02-05-FunctionLocalMetadataBecomesNull.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
addrspacecast-alias.ll
aggregate-constant-values.ll
aggregate-return-single-value.ll
alias-redefinition.ll AsmParser: Make the code for parsing unnamed aliases more closely resemble that for unnamed globals. 2015-11-25 02:54:07 +00:00
alias-use-list-order.ll
align-inst-alloca.ll
align-inst-load.ll
align-inst-store.ll
align-inst.ll
alignstack.ll
alloca-invalid-type-2.ll
alloca-invalid-type.ll
alloca-size-one.ll
anon-functions.ll
atomic.ll
attribute-builtin.ll
auto_upgrade_intrinsics.ll Revert "Support arbitrary addrspace pointers in masked load/store intrinsics" 2016-04-14 08:47:17 +00:00
autoupgrade-thread-pointer.ll [AArch64] [ARM] Make a target-independent llvm.thread.pointer intrinsic. 2016-04-19 20:51:05 +00:00
bcwrap.ll
call-invalid-1.ll
comment.ll
ConstantExprFold.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
ConstantExprFoldCast.ll Fix constant folding of addrspacecast of null 2016-05-21 00:14:04 +00:00
ConstantExprFoldSelect.ll
ConstantExprNoFold.ll
debug-info.ll Macro debug info support in LLVM IR 2015-12-10 12:56:35 +00:00
dicompileunit.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
dicompositetype-members.ll DebugInfo: Remove MDString-based type references 2016-04-23 21:08:00 +00:00
diexpression.ll
difile-escaped-chars.ll
diglobalvariable.ll
diimportedentity.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
dilexicalblock.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
dilocalvariable-arg-large.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
dilocalvariable.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
dilocation.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
dimodule.ll
dinamespace.ll
diobjcproperty.ll
distinct-mdnode.ll
disubprogram.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
disubrange-empty-array.ll
disubroutinetype.ll [DebugInfo] Add calling convention support for DWARF and CodeView 2016-06-08 20:34:29 +00:00
ditemplateparameter.ll
ditype-large-values.ll
drop-debug-info.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
externally-initialized.ll
extractvalue-invalid-idx.ll
extractvalue-no-idx.ll
fast-math-flags.ll
flags.ll
generic-debug-node.ll
getelementptr_invalid_ptr.ll
getelementptr_struct.ll
getelementptr_vec_idx1.ll
getelementptr_vec_idx2.ll
getelementptr_vec_idx3.ll
getelementptr_vec_idx4.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
getelementptr_vec_struct.ll
getelementptr.ll
getInt.ll
global-addrspace-forwardref.ll
gv-invalid-type.ll
half-constprop.ll
half-conv.ll
half.ll
huge-array.ll
ifunc-asm.ll [IFUNC] Fix ifunc-asm.ll test 2016-04-08 06:45:19 +00:00
ifunc-use-list-order.ll [GCC] Attribute ifunc support in llvm 2016-04-07 12:32:19 +00:00
inalloca.ll
incorrect-tdep-attrs-parsing.ll
inline-asm-clobber.ll
insertextractvalue.ll
insertvalue-invalid-idx.ll
insertvalue-invalid-type-1.ll
insertvalue-invalid-type.ll
internal-hidden-alias.ll
internal-hidden-function.ll
internal-hidden-variable.ll
internal-protected-alias.ll
internal-protected-function.ll
internal-protected-variable.ll
invalid_cast2.ll
invalid_cast3.ll
invalid_cast4.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
invalid_cast.ll
invalid-alias-mismatched-explicit-type.ll
invalid-attrgrp.ll
invalid-comdat2.ll
invalid-comdat.ll
invalid-datalayout1.ll
invalid-datalayout2.ll
invalid-datalayout3.ll
invalid-datalayout4.ll
invalid-datalayout5.ll
invalid-datalayout6.ll
invalid-datalayout7.ll
invalid-datalayout8.ll
invalid-datalayout9.ll
invalid-datalayout10.ll
invalid-datalayout11.ll
invalid-datalayout12.ll
invalid-datalayout13.ll
invalid-datalayout14.ll
invalid-datalayout15.ll
invalid-datalayout16.ll
invalid-datalayout17.ll
invalid-datalayout18.ll
invalid-datalayout19.ll
invalid-datalayout20.ll
invalid-datalayout21.ll
invalid-datalayout22.ll
invalid-datalayout23.ll
invalid-datalayout24.ll
invalid-debug-info-version.ll
invalid-dicompileunit-emissionkind-bad.ll Move the DebugEmissionKind enum from DIBuilder into DICompileUnit. 2016-03-31 23:56:58 +00:00
invalid-dicompileunit-language-bad.ll
invalid-dicompileunit-language-overflow.ll
invalid-dicompileunit-missing-language.ll
invalid-dicompileunit-null-file.ll
invalid-dicompileunit-uniqued.ll
invalid-dicompositetype-missing-tag.ll
invalid-diderivedtype-missing-basetype.ll
invalid-diderivedtype-missing-tag.ll
invalid-dienumerator-missing-name.ll
invalid-dienumerator-missing-value.ll
invalid-diexpression-large.ll
invalid-diexpression-verify.ll
invalid-difile-missing-directory.ll
invalid-difile-missing-filename.ll
invalid-diglobalvariable-empty-name.ll
invalid-diglobalvariable-missing-name.ll
invalid-diimportedentity-missing-scope.ll
invalid-diimportedentity-missing-tag.ll
invalid-dilexicalblock-missing-scope.ll
invalid-dilexicalblock-null-scope.ll
invalid-dilexicalblockfile-missing-discriminator.ll
invalid-dilexicalblockfile-missing-scope.ll
invalid-dilexicalblockfile-null-scope.ll
invalid-dilocalvariable-arg-large.ll
invalid-dilocalvariable-arg-negative.ll
invalid-dilocalvariable-missing-scope.ll
invalid-dilocalvariable-null-scope.ll
invalid-dilocation-field-bad.ll
invalid-dilocation-field-twice.ll
invalid-dilocation-missing-scope-2.ll
invalid-dilocation-missing-scope.ll
invalid-dilocation-null-scope.ll
invalid-dilocation-overflow-column.ll
invalid-dilocation-overflow-line.ll
invalid-dinamespace-missing-namespace.ll
invalid-disubprogram-uniqued-definition.ll
invalid-disubrange-count-large.ll
invalid-disubrange-count-missing.ll
invalid-disubrange-count-negative.ll
invalid-disubrange-lowerBound-max.ll
invalid-disubrange-lowerBound-min.ll
invalid-disubroutinetype-missing-types.ll
invalid-ditemplatetypeparameter-missing-type.ll
invalid-ditemplatevalueparameter-missing-value.ll
invalid-fp80hex.ll
invalid-fwdref1.ll
invalid-fwdref2.ll
invalid-generic-debug-node-tag-bad.ll
invalid-generic-debug-node-tag-missing.ll
invalid-generic-debug-node-tag-overflow.ll
invalid-generic-debug-node-tag-wrong-type.ll
invalid-gep-mismatched-explicit-type.ll
invalid-gep-missing-explicit-type.ll
invalid-hexint.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
invalid-inline-constraint.ll
invalid-label.ll
invalid-landingpad.ll
invalid-load-mismatched-explicit-type.ll
invalid-load-missing-explicit-type.ll
invalid-mdnode-badref.ll AsmParser: Don't crash on unresolved !tbaa 2016-04-06 02:06:40 +00:00
invalid-mdnode-vector2.ll
invalid-mdnode-vector.ll
invalid-metadata-attachment-has-type.ll
invalid-metadata-function-local-attachments.ll
invalid-metadata-function-local-complex-1.ll
invalid-metadata-function-local-complex-2.ll
invalid-metadata-function-local-complex-3.ll
invalid-metadata-has-type.ll
invalid-name2.ll
invalid-name.ll
invalid-safestack-param.ll
invalid-safestack-return.ll
invalid-specialized-mdnode.ll
invalid-untyped-metadata.ll
invalid-uselistorder_bb-missing-bb.ll
invalid-uselistorder_bb-missing-body.ll
invalid-uselistorder_bb-missing-func.ll
invalid-uselistorder_bb-not-bb.ll
invalid-uselistorder_bb-not-func.ll
invalid-uselistorder_bb-numbered.ll
invalid-uselistorder-function-between-blocks.ll
invalid-uselistorder-function-missing-named.ll
invalid-uselistorder-function-missing-numbered.ll
invalid-uselistorder-global-missing.ll
invalid-uselistorder-indexes-duplicated.ll
invalid-uselistorder-indexes-empty.ll
invalid-uselistorder-indexes-one.ll
invalid-uselistorder-indexes-ordered.ll
invalid-uselistorder-indexes-range.ll
invalid-uselistorder-indexes-toofew.ll
invalid-uselistorder-indexes-toomany.ll
invalid-uselistorder-type.ll
large-comdat.ll
local-unnamed-addr.ll IR: Introduce local_unnamed_addr attribute. 2016-06-14 21:01:22 +00:00
metadata-function-local.ll
metadata-null-operands.ll
metadata.ll IR: Allow multiple global metadata attachments with the same type. 2016-06-01 01:17:57 +00:00
missing-tbaa.ll AsmParser: Don't crash on unresolved !tbaa 2016-04-06 02:06:40 +00:00
MultipleReturnValueType.ll
musttail-invalid-1.ll
musttail-invalid-2.ll
musttail.ll
named-metadata.ll
no-mdstring-upgrades.ll IR: Stop upgrading !llvm.loop attachments via MDString 2016-03-25 00:56:13 +00:00
numbered-values.ll
private-hidden-alias.ll
private-hidden-function.ll
private-hidden-variable.ll
private-protected-alias.ll
private-protected-function.ll
private-protected-variable.ll
select.ll
short-hexpair.ll
source-filename-backslash.ll Use existing PrintEscapedString in AssemblyWriter 2016-03-30 22:17:28 +00:00
source-filename.ll Restore "[ThinLTO] Serialize the Module SourceFileName to/from LLVM assembly" 2016-03-30 18:15:08 +00:00
tls-models.ll
token.ll [IR] Add support for empty tokens 2015-11-11 21:57:16 +00:00
unnamed-addr.ll
unnamed-alias.ll AsmParser: Make the code for parsing unnamed aliases more closely resemble that for unnamed globals. 2015-11-25 02:54:07 +00:00
unnamed-comdat.ll
unnamed.ll
unsized-recursive-type.ll
uselistorder_bb.ll
uselistorder.ll
vbool-cmp.ll
vector-cmp.ll Make "@name =" mandatory for globals in .ll files. 2016-05-10 18:22:45 +00:00
vector-select.ll
vector-shift.ll
x86mmx.ll