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Sean Fertile c70d28bff5 Represent runtime preemption in the IR. 
Currently we do not represent runtime preemption in the IR, which has several
drawbacks:

  1) The semantics of GlobalValues differ depending on the object file format
     you are targeting (as well as the relocation-model and -fPIE value).
  2) We have no way of disabling inlining of run time interposable functions,
     since in the IR we only know if a function is link-time interposable.
     Because of this llvm cannot support elf-interposition semantics.
  3) In LTO builds of executables we will have extra knowledge that a symbol
     resolved to a local definition and can't be preemptable, but have no way to
     propagate that knowledge through the compiler.

This patch adds preemptability specifiers to the IR with the following meaning:

dso_local --> means the compiler may assume the symbol will resolve to a
 definition within the current linkage unit and the symbol may be accessed
 directly even if the definition is not within this compilation unit.

dso_preemptable --> means that the compiler must assume the GlobalValue may be
replaced with a definition from outside the current linkage unit at runtime.

To ease transitioning dso_preemptable is treated as a 'default' in that
low-level codegen will still do the same checks it did previously to see if a
symbol should be accessed indirectly. Eventually when IR producers emit the
specifiers on all Globalvalues we can change dso_preemptable to mean 'always
access indirectly', and remove the current logic.

Differential Revision: https://reviews.llvm.org/D20217

llvm-svn: 316668
 		2017-10-26 15:00:26 +00:00
..
Inputs Do not want to use BFI to get profile count for sample pgo 2017-08-03 17:11:41 +00:00
2006-12-11-Cast-ConstExpr.ll
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2009-06-11-FirstClassAggregateConstant.ll
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DICompileUnit-no-DWOId.ll DI: Disallow uniquable DICompileUnits 2015-08-03 17:26:41 +00:00
DICompileUnit-no-DWOId.ll.bc IR / debug info: Add a DWOId field to DICompileUnit, 2015-05-21 20:37:30 +00:00
DIExpression-4.0.ll Fix a bug in a historic bitcode testcase. NFC. 2017-09-21 23:14:52 +00:00
DIExpression-4.0.ll.bc Fix a bug in a historic bitcode testcase. NFC. 2017-09-21 23:14:52 +00:00
DIExpression-aggresult.ll Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
DIExpression-aggresult.ll.bc PR32382: Fix emitting complex DWARF expressions. 2017-04-18 01:21:53 +00:00
DIExpression-deref.ll Fix a bug in a historic bitcode testcase. 2017-09-21 23:14:55 +00:00
DIExpression-deref.ll.bc Fix a bug in a historic bitcode testcase. 2017-09-21 23:14:55 +00:00
DIExpression-minus-upgrade.ll Align definition of DW_OP_plus with DWARF spec [3/3] 2017-06-14 13:14:38 +00:00
DIExpression-minus-upgrade.ll.bc Align definition of DW_OP_plus with DWARF spec [3/3] 2017-06-14 13:14:38 +00:00
DIGlobalVariableExpression.ll Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
DIGlobalVariableExpression.ll.bc Fix the bitcode upgrade for DIGlobalVariable in a DIImportedEntity context. 2017-02-07 17:35:41 +00:00
DIGlobalVariableExpression2.ll Canonicalize the representation of empty an expression in DIGlobalVariableExpression 2017-08-30 18:06:51 +00:00
DIGlobalVariableExpression2.ll.bc Fix bitcode upgrade for DIGlobalVariables with a var: field. 2017-02-08 17:44:43 +00:00
DILocalVariable-explicit-tags.ll [Bitcode] Fix + regenerate old test so that it includes a DICompileUnit. 2016-04-12 15:51:23 +00:00
DILocalVariable-explicit-tags.ll.bc [Bitcode] Fix + regenerate old test so that it includes a DICompileUnit. 2016-04-12 15:51:23 +00:00
DINamespace.ll Remove line and file from DINamespace. 2017-04-28 22:25:46 +00:00
DINamespace.ll.bc Add DWARF debug info support for C++11 inline namespaces. 2016-11-03 19:42:02 +00:00
DISubprogram-distinct-definitions.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
DISubprogram-distinct-definitions.ll.bc [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
PR23310.test Fix for PR23310: llvm-dis crashes when trying to upgrade an intrinsic. 2015-07-02 16:22:40 +00:00
aggregateInstructions.3.2.ll
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aggregateInstructions.3.2.ll.bc
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anon-functions.ll Fix PR25101 - Handle anonymous functions without VST entries 2015-10-10 14:18:36 +00:00
arm32_neon_vcnt_upgrade.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
atomic-no-syncscope.ll Enhance synchscope representation 2017-07-11 22:23:00 +00:00
atomic-no-syncscope.ll.bc Enhance synchscope representation 2017-07-11 22:23:00 +00:00
atomic.ll Enhance synchscope representation 2017-07-11 22:23:00 +00:00
attributes-3.3.ll
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attributes-3.3.ll.bc
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attributes.ll Add speculatable function attribute 2017-04-28 20:25:27 +00:00
auto_upgrade_intrinsics.bc Upgrade TBAA *before* upgrading intrinsics 2016-03-16 23:17:54 +00:00
avr-calling-conventions.ll [AVR] Add calling convention parser tokens 2016-03-03 10:08:02 +00:00
avr-calling-conventions.ll.bc [AVR] Add calling convention parser tokens 2016-03-03 10:08:02 +00:00
binaryFloatInstructions.3.2.ll
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binaryFloatInstructions.3.2.ll.bc
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binaryIntInstructions.3.2.ll
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binaryIntInstructions.3.2.ll.bc
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bitcode-wrapper-header-armv7m.ll [llvm-bcanalyzer] Dump bitcode wrapper header 2016-01-29 05:55:09 +00:00
bitcode-wrapper-header-x86_64.ll [llvm-bcanalyzer] Dump bitcode wrapper header 2016-01-29 05:55:09 +00:00
bitwiseInstructions.3.2.ll
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bitwiseInstructions.3.2.ll.bc
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blockaddress.ll
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calling-conventions.3.2.ll
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calling-conventions.3.2.ll.bc
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case-ranges-3.3.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
case-ranges-3.3.ll.bc
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cmpxchg-upgrade.ll
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cmpxchg-upgrade.ll.bc
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cmpxchg.3.6.ll [opaque pointer type] Encode the pointee type in the bitcode for 'cmpxchg' 2015-04-28 04:30:29 +00:00
cmpxchg.3.6.ll.bc [opaque pointer type] Encode the pointee type in the bitcode for 'cmpxchg' 2015-04-28 04:30:29 +00:00
compatibility-3.6.ll [AArch64] Extend CallingConv::X86_64_Win64 to AArch64 as well 2017-07-17 20:05:19 +00:00
compatibility-3.6.ll.bc [IR] Limit bits used for CallingConv::ID, update tests 2015-10-27 21:17:06 +00:00
compatibility-3.7.ll [AArch64] Extend CallingConv::X86_64_Win64 to AArch64 as well 2017-07-17 20:05:19 +00:00
compatibility-3.7.ll.bc [IR] Limit bits used for CallingConv::ID, update tests 2015-10-27 21:17:06 +00:00
compatibility-3.8.ll [AArch64] Extend CallingConv::X86_64_Win64 to AArch64 as well 2017-07-17 20:05:19 +00:00
compatibility-3.8.ll.bc [Bitcode] Add compatibility test for the 3.8 release 2016-03-16 05:43:03 +00:00
compatibility-3.9.ll [AArch64] Extend CallingConv::X86_64_Win64 to AArch64 as well 2017-07-17 20:05:19 +00:00
compatibility-3.9.ll.bc [Bitcode] Add compatibility test for the 3.9 release 2016-09-09 17:24:31 +00:00
compatibility-4.0.ll [AArch64] Extend CallingConv::X86_64_Win64 to AArch64 as well 2017-07-17 20:05:19 +00:00
compatibility-4.0.ll.bc [Bitcode] Add compatibility test for the 4.0 release 2017-03-17 17:53:26 +00:00
compatibility-5.0.ll [Bitcode] Add a compatibility test for 5.0.0 bitcode 2017-09-13 21:40:59 +00:00
compatibility-5.0.ll.bc [Bitcode] Add a compatibility test for 5.0.0 bitcode 2017-09-13 21:40:59 +00:00
compatibility.ll [AMDGPU] calling conventions for AMDPAL OS type 2017-09-29 09:51:22 +00:00
constantsTest.3.2.ll [opaque pointer type] Add textual IR support for explicit type parameter to getelementptr instruction 2015-02-27 19:29:02 +00:00
constantsTest.3.2.ll.bc
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conversionInstructions.3.2.ll
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conversionInstructions.3.2.ll.bc
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debug-loc-again.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
dicompileunit-gnu-pubnames.ll IR: Represent -ggnu-pubnames with a flag on the DICompileUnit. 2017-09-12 21:50:41 +00:00
diglobalvariable-3.8.ll Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
diglobalvariable-3.8.ll.bc [IR] Remove the DIExpression field from DIGlobalVariable. 2016-12-20 02:09:43 +00:00
dilocalvariable-3.9.ll DebugInfo: add bitcode upgrade test for alignment 2016-10-26 08:34:19 +00:00
dilocalvariable-3.9.ll.bc DebugInfo: add bitcode upgrade test for alignment 2016-10-26 08:34:19 +00:00
dityperefs-3.8.ll Fix the bitcode upgrade for DIGlobalVariable in a DIImportedEntity context. 2017-02-07 17:35:41 +00:00
dityperefs-3.8.ll.bc BitcodeReader: Fix some holes in upgrade from r267296 2016-04-24 06:52:01 +00:00
drop-debug-info.3.5.ll llvm-dis: Stop crashing when dropping debug info 2015-02-25 01:10:03 +00:00
drop-debug-info.3.5.ll.bc llvm-dis: Stop crashing when dropping debug info 2015-02-25 01:10:03 +00:00
dso_location.ll Represent runtime preemption in the IR. 2017-10-26 15:00:26 +00:00
extractelement.ll
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fcmp-fast.ll Add support for fast-math flags to the FCmp instruction. 2015-07-10 12:52:00 +00:00
flags.ll
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function-encoding-rel-operands.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
function-local-metadata.3.5.ll
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function-local-metadata.3.5.ll.bc
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global-variables.3.2.ll
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global-variables.3.2.ll.bc
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globalvariable-attributes.ll [IR] Allow attributes with global variables 2017-05-11 12:28:08 +00:00
highLevelStructure.3.2.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
highLevelStructure.3.2.ll.bc
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identification.ll Add an (optional) identification block in the bitcode 2015-10-26 18:37:00 +00:00
inalloca.ll
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invalid-weak-external.ll Object: Downgrade invalid weak externals from an assert fail to an llvm::Error when creating an irsymtab. 2017-09-07 01:33:52 +00:00
invalid.ll Add writeonly IR attribute 2016-07-04 08:01:29 +00:00
invalid.ll.bc Add writeonly IR attribute 2016-07-04 08:01:29 +00:00
invalid.test Bitcode: Introduce initial multi-module reader API. 2016-11-16 21:44:45 +00:00
linkage-types-3.2.ll Bring r226038 back. 2015-01-19 15:16:06 +00:00
linkage-types-3.2.ll.bc
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local-linkage-default-visibility.3.4.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
local-linkage-default-visibility.3.4.ll.bc
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mdnodes-distinct-in-post-order.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
mdnodes-distinct-nodes-break-cycles.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
mdnodes-distinct-nodes-first.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
mdnodes-in-post-order.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
mdstring-high-bits.ll
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memInstructions.3.2.ll Enhance synchscope representation 2017-07-11 22:23:00 +00:00
memInstructions.3.2.ll.bc
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metadata-2.ll [opaque pointer type] Add textual IR support for explicit type parameter to gep operator 2015-03-13 18:20:45 +00:00
metadata-function-blocks.ll Add an index for Module Metadata record in the bitcode 2016-12-28 22:30:28 +00:00
metadata-only-empty-string.ll BitcodeReader: Allow METADATA_STRINGS to only have !"" 2016-03-29 05:25:17 +00:00
metadata-strings.ll Reapply ~"Bitcode: Collect all MDString records into a single blob" 2016-03-27 23:17:54 +00:00
metadata.3.5.ll
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metadata.3.5.ll.bc
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metadata.ll
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miscInstructions.3.2.ll Move the personality function from LandingPadInst to Function 2015-06-17 20:52:32 +00:00
miscInstructions.3.2.ll.bc
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module-hash-strtab.ll Bitcode: Include any strings added to the string table in the module hash. 2017-07-06 17:56:01 +00:00
module_hash.ll Bitcode: Include any strings added to the string table in the module hash. 2017-07-06 17:56:01 +00:00
multi-module.ll Bitcode: Add a more comprehensive multi-module test now that we have both llvm-cat and llvm-modextract. 2016-11-29 21:55:09 +00:00
null-type.ll Bitcode: Introduce initial multi-module reader API. 2016-11-16 21:44:45 +00:00
null-type.ll.bc
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old-aliases.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
old-aliases.ll.bc
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operand-bundles-bc-analyzer.ll Symbolize operand bundle blocks for bcanalyzer 2016-04-26 05:59:08 +00:00
operand-bundles.ll [Bitcode][Asm] Teach LLVM to read and write operand bundles. 2015-09-24 23:34:52 +00:00
padding.test Improve handling of end of file in the bitcode reader. 2015-06-16 20:03:39 +00:00
pr18704.ll llvm-dis: Stop crashing when dropping debug info 2015-02-25 01:10:03 +00:00
pr18704.ll.bc
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ptest-new.ll
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ptest-old.ll [X86] Replace 'REQUIRES: x86' in tests with 'REQUIRES: x86-registered-target' which seems to be the correct way to make them run on an x86 build. 2017-06-04 08:21:58 +00:00
select.ll [BitcodeReader] Ensure we can read constant vector selects with an i1 condition 2015-08-31 18:00:30 +00:00
shuffle.ll
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source-filename.test Restore "[ThinLTO] Use MD5 hash in function index." with fix 2016-02-10 21:55:02 +00:00
ssse3_palignr.ll
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standardCIntrinsic.3.2.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
standardCIntrinsic.3.2.ll.bc
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summary_version.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
tailcall.ll [IR] Limit bits used for CallingConv::ID, update tests 2015-10-27 21:17:06 +00:00
terminatorInstructions.3.2.ll
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terminatorInstructions.3.2.ll.bc
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thinlto-alias.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
thinlto-alias2.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
thinlto-asm-noimport.ll ModuleSummaryAnalysis: Correctly handle refs from function inline asm to module inline asm. 2017-09-01 16:24:02 +00:00
thinlto-empty-summary-section.ll [ThinLTO] Always emit a summary when compiling in ThinLTO mode 2016-09-20 23:07:17 +00:00
thinlto-function-summary-callgraph-pgo.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
thinlto-function-summary-callgraph-profile-summary.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
thinlto-function-summary-callgraph-sample-profile-summary.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
thinlto-function-summary-callgraph.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
thinlto-function-summary-functionattrs.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
thinlto-function-summary-originalnames.ll Bitcode: Add a string table to the bitcode format. 2017-04-17 17:51:36 +00:00
thinlto-function-summary-refgraph.ll [ThinLTO] Add FunctionAttrs to ThinLTO index 2017-08-04 16:00:58 +00:00
thinlto-function-summary.ll Bitcode: Write the irsymtab to disk. 2017-06-27 23:50:11 +00:00
thinlto-summary-globalvar.ll [PM] Port ModuleSummaryIndex analysis to new pass manager 2016-08-12 13:53:02 +00:00
thinlto-summary-linkage-types.ll [ThinLTO] Use valueid instead of bitcode offsets in combined index file 2016-04-27 13:28:35 +00:00
thinlto-summary-section.ll [ThinLTO] Subsume all importing checks into a single flag 2017-01-05 14:32:16 +00:00
thinlto-type-tests.ll IR: Function summary representation for type tests. 2016-12-21 23:03:45 +00:00
thinlto-type-vcalls.ll IR: Function summary extensions for whole-program devirtualization pass. 2017-02-10 22:29:38 +00:00
thinlto-unused-type-tests.ll IR: Function summary representation for type tests. 2016-12-21 23:03:45 +00:00
upgrade-dbg-value.ll Parse and print DIExpressions inline to ease IR and MIR testing 2017-08-23 20:31:27 +00:00
upgrade-dbg-value.ll.bc Remove the obsolete offset parameter from @llvm.dbg.value 2017-07-28 20:21:02 +00:00
upgrade-debug-info-for-profiling.ll Change debug-info-for-profiling from a TargetOption to a function attribute. 2017-02-01 22:45:09 +00:00
upgrade-debug-info-for-profiling.ll.bc Change debug-info-for-profiling from a TargetOption to a function attribute. 2017-02-01 22:45:09 +00:00
upgrade-global-ctors.ll
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upgrade-global-ctors.ll.bc
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upgrade-importedentity.ll Debug Info: Add a file: field to DIImportedEntity. 2017-07-19 00:09:54 +00:00
upgrade-importedentity.ll.bc Debug Info: Add a file: field to DIImportedEntity. 2017-07-19 00:09:54 +00:00
upgrade-linker-options.ll IR: Replace the "Linker Options" module flag with "llvm.linker.options" named metadata. 2017-06-12 20:10:48 +00:00
upgrade-loop-metadata.ll [opaque pointer type] Add textual IR support for explicit type parameter to load instruction 2015-02-27 21:17:42 +00:00
upgrade-loop-metadata.ll.bc
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upgrade-module-flag.ll [AutoUpgrade] Fix a compatibility issue with module flag 2017-09-15 21:12:14 +00:00
upgrade-pointer-address-space.ll [DebugInfo] Emit address space with DW_AT_address_class attribute for pointer and reference types 2017-03-08 23:55:44 +00:00
upgrade-pointer-address-space.ll.bc [DebugInfo] Emit address space with DW_AT_address_class attribute for pointer and reference types 2017-03-08 23:55:44 +00:00
upgrade-section-name.ll Bitcode: add an auto-upgrade for LTO section name 2017-10-06 18:06:59 +00:00
upgrade-subprogram-this.ll [codeview] Add DISubprogram::ThisAdjustment 2016-07-01 02:41:21 +00:00
upgrade-subprogram-this.ll.bc [codeview] Add DISubprogram::ThisAdjustment 2016-07-01 02:41:21 +00:00
upgrade-subprogram.ll [PR27284] Reverse the ownership between DICompileUnit and DISubprogram. 2016-04-15 15:57:41 +00:00
upgrade-subprogram.ll.bc DI: Reverse direction of subprogram -> function edge. 2015-11-05 22:03:56 +00:00
upgrade-tbaa.ll
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use-list-order.ll [opaque pointer type] Add textual IR support for explicit type parameter for global aliases 2015-09-11 03:22:04 +00:00
use-list-order2.ll [Bitcode] Add xfail test for PR24755 (uselistorder) 2015-09-10 16:02:24 +00:00
variableArgumentIntrinsic.3.2.ll
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variableArgumentIntrinsic.3.2.ll.bc
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vectorInstructions.3.2.ll
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vectorInstructions.3.2.ll.bc
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visibility-styles.3.2.ll
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visibility-styles.3.2.ll.bc
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vst-forward-declaration.ll Restore "Function bitcode index in Value Symbol Table and lazy reading support" 2015-09-17 20:12:00 +00:00
weak-cmpxchg-upgrade.ll
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weak-cmpxchg-upgrade.ll.bc
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weak-macho-3.5.ll Bitcode: Don't create comdats when autoupgrading macho bitcode 2015-01-20 05:58:07 +00:00
weak-macho-3.5.ll.bc Bitcode: Don't create comdats when autoupgrading macho bitcode 2015-01-20 05:58:07 +00:00