Peter Collingbourne 93adc422a8 hwasan: Add a tag_offset DWARF attribute to instrumented stack variables. ... The goal is to improve hwasan's error reporting for stack use-after-return by recording enough information to allow the specific variable that was accessed to be identified based on the pointer's tag. Currently we record the PC and lower bits of SP for each stack frame we create (which will eventually be enough to derive the base tag used by the stack frame) but that's not enough to determine the specific tag for each variable, which is the stack frame's base tag XOR a value (the "tag offset") that is unique for each variable in a function. In IR, the tag offset is most naturally represented as part of a location expression on the llvm.dbg.declare instruction. However, the presence of the tag offset in the variable's actual location expression is likely to confuse debuggers which won't know about tag offsets, and moreover the tag offset is not required for a debugger to determine the location of the variable on the stack, so at the DWARF level it is represented as an attribute so that it will be ignored by debuggers that don't know about it. Differential Revision: https://reviews.llvm.org/D63119 llvm-svn: 363635		2019-06-17 23:39:41 +00:00
..
AccelTable.cpp	Reapply: "DebugInfo: Emit only one kind of accelerated access/name table""	2019-04-23 19:00:45 +00:00
AddressPool.cpp	DebugInfo: Use assembly label arithmetic for address pool size for easier reading/editing	2019-01-24 03:27:57 +00:00
AddressPool.h	DebugInfo: Use assembly label arithmetic for address pool size for easier reading/editing	2019-01-24 03:27:57 +00:00
ARMException.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
AsmPrinter.cpp	[Remarks][NFC] Move the serialization to lib/Remarks	2019-05-30 21:45:59 +00:00
AsmPrinterDwarf.cpp	Add explicit dependencies on MCSection.h and MCDwarf.h to the .cpp	2019-04-12 07:40:01 +00:00
AsmPrinterInlineAsm.cpp	[AsmPrinter] refactor to support %c w/ GlobalAddress'	2019-04-26 18:45:04 +00:00
ByteStreamer.h	[DebugInfo] Introduce DW_OP_LLVM_convert	2019-03-19 13:16:28 +00:00
CMakeLists.txt	Revert "[BTF] Add BTF DebugInfo"	2018-11-30 16:54:43 +00:00
CodeViewDebug.cpp	Use fully qualified name when printing S_CONSTANT records	2019-06-13 22:53:43 +00:00
CodeViewDebug.h	Emit global variables as S_CONSTANT records for codeview debug info.	2019-05-16 22:28:52 +00:00
DbgEntityHistoryCalculator.cpp	[DebugInfo] Use FrameDestroy to extend stack locations to end-of-function	2019-06-13 10:03:17 +00:00
DebugHandlerBase.cpp	Stop undef fragments from closing non-overlapping fragments	2019-05-28 13:23:25 +00:00
DebugLocEntry.h	[DebugInfo] Move Value struct out of DebugLocEntry as DbgValueLoc (NFC)	2019-06-13 10:23:26 +00:00
DebugLocStream.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
DebugLocStream.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
DIE.cpp	[DebugInfo] Introduce DW_OP_LLVM_convert	2019-03-19 13:16:28 +00:00
DIEHash.cpp	[DebugInfo] Introduce DW_OP_LLVM_convert	2019-03-19 13:16:28 +00:00
DIEHash.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
DIEHashAttributes.def
DwarfCFIException.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
DwarfCompileUnit.cpp	hwasan: Add a tag_offset DWARF attribute to instrumented stack variables.	2019-06-17 23:39:41 +00:00
DwarfCompileUnit.h	DebugInfo: Emit only declarations (not whole definitions) of non-unit user defined types into type units	2019-04-24 18:09:44 +00:00
DwarfDebug.cpp	[DebugInfo] Move Value struct out of DebugLocEntry as DbgValueLoc (NFC)	2019-06-13 10:23:26 +00:00
DwarfDebug.h	[DebugInfo] Move Value struct out of DebugLocEntry as DbgValueLoc (NFC)	2019-06-13 10:23:26 +00:00
DwarfException.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
DwarfExpression.cpp	hwasan: Add a tag_offset DWARF attribute to instrumented stack variables.	2019-06-17 23:39:41 +00:00
DwarfExpression.h	hwasan: Add a tag_offset DWARF attribute to instrumented stack variables.	2019-06-17 23:39:41 +00:00
DwarfFile.cpp	DebugInfo: Split DWARF + gmlt + no-split-dwarf-inlining shouldn't emit anything to the .dwo file	2019-02-12 00:00:38 +00:00
DwarfFile.h	[AsmPrinter] Delete unused RangeSpanList::addRange	2019-04-10 10:35:10 +00:00
DwarfStringPool.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
DwarfStringPool.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
DwarfUnit.cpp	DebugInfo: Include enumerators in pubnames	2019-06-14 01:58:56 +00:00
DwarfUnit.h	[DebugInfo] More strict debug range for stack variables	2019-06-10 08:41:06 +00:00
EHStreamer.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
EHStreamer.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
ErlangGCPrinter.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
LLVMBuild.txt	[Remarks] Add string deduplication using a string table	2019-04-24 00:06:24 +00:00
OcamlGCPrinter.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
WasmException.cpp	[WebAssembly] Exception handling: Switch to the new proposal	2019-01-30 03:21:57 +00:00
WasmException.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
WinCFGuard.cpp	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
WinCFGuard.h	Update the file headers across all of the LLVM projects in the monorepo	2019-01-19 08:50:56 +00:00
WinException.cpp	[AArch64][Windows] Compute function length correctly in unwind tables.	2019-05-03 00:10:45 +00:00
WinException.h	[AArch64][Windows] Compute function length correctly in unwind tables.	2019-05-03 00:10:45 +00:00