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5ff5907996
llvm/lib/IR
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Sanjoy Das 5ff5907996 [IR] Introduce a dereferenceable_or_null(N) attribute. 
Summary:
If a pointer is marked as dereferenceable_or_null(N), LLVM assumes it
is either `null` or `dereferenceable(N)` or both.  This change only
introduces the attribute and adds a token test case for the `llvm-as`
/ `llvm-dis`.  It does not hook up other parts of the optimizer to
actually exploit the attribute -- those changes will come later.

For pointers in address space 0, `dereferenceable(N)` is now exactly
equivalent to `dereferenceable_or_null(N)` && `nonnull`.  For other
address spaces, `dereferenceable(N)` is potentially weaker than
`dereferenceable_or_null(N)` && `nonnull` (since we could have a null
`dereferenceable(N)` pointer).

The motivating case for this change is Java (and other managed
languages), where pointers are either `null` or dereferenceable up to
some usually known-at-compile-time constant offset.

Reviewers: rafael, hfinkel

Reviewed By: hfinkel

Subscribers: nicholas, llvm-commits

Differential Revision: http://reviews.llvm.org/D8650

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235132 91177308-0d34-0410-b5e6-96231b3b80d8
2015-04-16 20:29:50 +00:00
..
AsmWriter.cpp DebugInfo: Remove 'inlinedAt:' field from MDLocalVariable 2015-04-15 22:29:27 +00:00
AttributeImpl.h [IR] Introduce a dereferenceable_or_null(N) attribute. 2015-04-16 20:29:50 +00:00
Attributes.cpp [IR] Introduce a dereferenceable_or_null(N) attribute. 2015-04-16 20:29:50 +00:00
AutoUpgrade.cpp AutoUpgrade: Remove obsolete dbg.declare/value upgrade 2015-04-06 17:17:47 +00:00
BasicBlock.cpp Return iterator from BasicBlock::eraseFromParent 2015-04-03 01:20:33 +00:00
CMakeLists.txt uselistorder: Remove the global bits 2015-04-15 03:14:06 +00:00
Comdat.cpp IR: Add COMDATs to the IR 2014-06-27 18:19:56 +00:00
ConstantFold.cpp [opaque pointer type] API migration for GEP constant factories 2015-04-02 18:55:32 +00:00
ConstantFold.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
ConstantRange.cpp [ConstantRange] Split makeICmpRegion in two. 2015-03-18 00:41:24 +00:00
Constants.cpp [opaque pointer type] API migration for GEP constant factories 2015-04-02 18:55:32 +00:00
ConstantsContext.h Removing LLVM_DELETED_FUNCTION, as MSVC 2012 was the last reason for requiring the macro. NFC; LLVM edition. 2015-02-15 22:54:22 +00:00
Core.cpp [opaque pointer type] The last of the GEP IRBuilder API migrations 2015-04-05 22:41:44 +00:00
DataLayout.cpp COFF: Let globals with private linkage reside in their own section 2015-03-17 23:54:51 +00:00
DebugInfo.cpp DebugInfo: DIRef<> => TypedDebugNodeRef<> 2015-04-16 02:24:01 +00:00
DebugInfoMetadata.cpp DebugInfo: Remove 'inlinedAt:' field from MDLocalVariable 2015-04-15 22:29:27 +00:00
DebugLoc.cpp DebugInfo: Allow DebugLocs to be constructed from const 2015-04-16 16:56:29 +00:00
DiagnosticInfo.cpp DebugInfo: Gut DILocation 2015-04-14 01:35:55 +00:00
DiagnosticPrinter.cpp Fix typos in comments, NFC 2014-08-29 21:53:01 +00:00
DIBuilder.cpp DebugInfo: Remove DIDescriptor from the DIBuilder API 2015-04-16 16:36:23 +00:00
Dominators.cpp [PM] Port domtree to the new pass manager (at last). 2015-01-14 10:19:28 +00:00
Function.cpp [IR] Introduce a dereferenceable_or_null(N) attribute. 2015-04-16 20:29:50 +00:00
GCOV.cpp Remove more superfluous .str() and replace std::string concatenation with Twine. 2015-03-30 15:42:36 +00:00
Globals.cpp Remove getDataLayout() from Instruction/GlobalValue/BasicBlock/Function 2015-03-03 22:01:13 +00:00
GVMaterializer.cpp [Layering] Move GVMaterializer.h into the IR library where its 2014-03-06 03:50:29 +00:00
InlineAsm.cpp Silence sign compare warning. NFC. 2015-03-29 20:49:03 +00:00
Instruction.cpp Return iterator from Instruction::eraseFromParent. 2015-04-02 00:03:07 +00:00
Instructions.cpp [IR] Introduce a dereferenceable_or_null(N) attribute. 2015-04-16 20:29:50 +00:00
IntrinsicInst.cpp IR: Split Metadata from Value 2014-12-09 18:38:53 +00:00
IRBuilder.cpp [opaque pointer type] More GEP IRBuilder API migrations... 2015-04-03 21:33:42 +00:00
IRPrintingPasses.cpp uselistorder: Pull the bit through PrintModulePass 2015-04-15 02:38:06 +00:00
LegacyPassManager.cpp Use 'override/final' instead of 'virtual' for overridden methods 2015-04-11 02:11:45 +00:00
LLVMBuild.txt
LLVMContext.cpp Fix LLVMContext to match what MDKind names that the LL parser permits. Fixes PR21799! 2014-12-11 02:10:28 +00:00
LLVMContextImpl.cpp Revert GCStrategy ownership changes 2015-01-26 18:26:35 +00:00
LLVMContextImpl.h DebugInfo: Remove 'inlinedAt:' field from MDLocalVariable 2015-04-15 22:29:27 +00:00
Makefile
Mangler.cpp Revert "Address review comments" 2015-03-17 20:40:21 +00:00
MDBuilder.cpp [IC] Turn non-null MD on pointer loads to range MD on integer loads. 2015-02-25 05:10:25 +00:00
Metadata.cpp IR: Enable uniquing callbacks during MDNode::replaceWithUniqued() 2015-03-31 20:50:50 +00:00
MetadataImpl.h Added missing header for the explicit dependency on MDNode. 2015-02-04 00:20:52 +00:00
MetadataTracking.cpp IR: Store RAUW support and Context in the same pointer, NFC 2015-01-19 19:02:06 +00:00
Module.cpp Be lazy about loading metadata in IRObjectFile. 2015-03-13 21:54:20 +00:00
module.modulemap [modules] Add module maps for LLVM. These are not quite ready for prime-time 2014-05-21 02:46:14 +00:00
Pass.cpp Refactoring cl::parser construction and initialization. 2015-01-22 21:01:12 +00:00
PassManager.cpp [PM] Push the debug option for the new pass manager into the opt tool 2015-01-13 22:42:38 +00:00
PassRegistry.cpp Revert r231276 (including r231277): Add a lock() function in PassRegistry to speed up multi-thread synchronization. 2015-03-05 17:53:00 +00:00
Statepoint.cpp Add invoke related functionality into StatepointSite classes. 2015-02-19 11:02:11 +00:00
SymbolTableListTraitsImpl.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
Type.cpp [slp] Fix a nasty bug in the SLP vectorizer that Joerg pointed out. 2015-02-12 02:30:56 +00:00
TypeFinder.cpp Fix Value dangling reference debug output 2015-03-10 23:55:38 +00:00
Use.cpp Fix a URL (NFC) 2014-08-21 21:09:24 +00:00
User.cpp IR: Cleanup comments for Value, User, and MDNode 2014-10-15 20:28:31 +00:00
Value.cpp [CallSite] Make construction from Value* (or Instruction*) explicit. 2015-04-10 14:50:08 +00:00
ValueSymbolTable.cpp IR: Split Metadata from Value 2014-12-09 18:38:53 +00:00
ValueTypes.cpp
Verifier.cpp DebugInfo: Remove 'inlinedAt:' field from MDLocalVariable 2015-04-15 22:29:27 +00:00