Teresa Johnson a63ab3c9ea [LTO] Prevent dead stripping and internalization of symbols with sections ...

Summary:
ELF linkers generate __start_<secname> and __stop_<secname> symbols
when there is a value in a section <secname> where the name is a valid
C identifier.  If dead stripping determines that the values declared
in section <secname> are dead, and we then internalize (and delete)
such a symbol, programs that reference the corresponding start and end
section symbols will get undefined reference linking errors.

To fix this, add the section name to the IRSymtab entry when a symbol is
defined in a specific section. Then use this in the gold-plugin to mark
the symbol as external and visible from outside the summary when the
section name is a valid C identifier.

Reviewers: pcc

Subscribers: mehdi_amini, inglorion, eraman, llvm-commits

Differential Revision: https://reviews.llvm.org/D35639

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@309009 91177308-0d34-0410-b5e6-96231b3b80d8

2017-07-25 19:42:32 +00:00

..

Archive.cpp

Sort the remaining #include lines in include/... and lib/....

2017-06-06 11:49:48 +00:00

ArchiveWriter.cpp

llvm: add llvm-dlltool support to the archiver

2017-07-18 21:26:38 +00:00

Binary.cpp

Move Object format code to lib/BinaryFormat.

2017-06-07 03:48:56 +00:00

CMakeLists.txt

Bitcode: Write the irsymtab to disk.

2017-06-27 23:50:11 +00:00

COFFImportFile.cpp

[COFF] ARM64 support for COFFImportFile

2017-07-25 06:05:49 +00:00

COFFModuleDefinition.cpp

Object: preserve more information about DEF file

2017-07-19 02:01:22 +00:00

COFFObjectFile.cpp

llvm: add llvm-dlltool support to the archiver

2017-07-18 21:26:38 +00:00

Decompressor.cpp

Move Object format code to lib/BinaryFormat.

2017-06-07 03:48:56 +00:00

ELF.cpp

MC, Object: Reserve a section type, SHT_LLVM_ODRTAB, for the ODR table.

2017-06-14 18:52:12 +00:00

ELFObjectFile.cpp

Move Object format code to lib/BinaryFormat.

2017-06-07 03:48:56 +00:00

Error.cpp

Make the Error class constructor protected

2016-11-11 04:28:40 +00:00

IRObjectFile.cpp

Bitcode: Introduce a BitcodeFileContents data type. NFCI.

2017-06-08 22:00:24 +00:00

IRSymtab.cpp

[LTO] Prevent dead stripping and internalization of symbols with sections

2017-07-25 19:42:32 +00:00

LLVMBuild.txt

Move Object format code to lib/BinaryFormat.

2017-06-07 03:48:56 +00:00

MachOObjectFile.cpp

Small tweak to one check in error handling to the dyld compact export

2017-07-24 20:33:41 +00:00

MachOUniversal.cpp

Fix a bugs with using some Mach-O command line flags like "-arch armv7m".

2016-12-16 22:54:02 +00:00

ModuleSymbolTable.cpp

Sort the remaining #include lines in include/... and lib/....

2017-06-06 11:49:48 +00:00

Object.cpp

Sort the remaining #include lines in include/... and lib/....

2017-06-06 11:49:48 +00:00

ObjectFile.cpp

Move Object format code to lib/BinaryFormat.

2017-06-07 03:48:56 +00:00

RecordStreamer.cpp

[Object] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC).

2017-04-24 23:21:38 +00:00

RecordStreamer.h

[Object] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC).

2017-04-24 23:21:38 +00:00

SymbolicFile.cpp

Move Object format code to lib/BinaryFormat.

2017-06-07 03:48:56 +00:00

SymbolSize.cpp

Fix llvm-symbolizer to correctly sort a symbol array and calculate symbol sizes

2016-11-15 21:07:03 +00:00

WasmObjectFile.cpp

[WebAssembly] Expose the offset of each data segment

2017-07-12 00:24:54 +00:00

WindowsResource.cpp

Revert "Revert "Revert "Revert "Switch external cvtres.exe for llvm's own resource library.""""

2017-07-08 03:06:10 +00:00