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llvm-mirror/test/Object
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Rui Ueyama 18bbb959e4 Allow unaligned access to ELF file data structures. 
The ELF specification says that all ELF data structures are aligned to
their natural alignments both in memory and file. That means when we
access mmap'ed ELF files, we could assume that all data structures are
aligned properly.

However, in reality, we assume that the data structures are aligned only
to two bytes because .a files only guarantee that their member files are
aligned to two bytes in archive files. So the data access is already
unaligned.

This patch relaxes the alignment requirement even more, so that we
accept unaligned access to all ELF data structures.

This patch in particular makes lld bug-compatible with icc. Intel C
compiler doesn't seem to care about data alignment and generates unaligned
relocation sections (https://bugs.llvm.org/show_bug.cgi?id=35854).
I also saw another instance of compatibility issues with our internal tool
which creates unaligned section headers.

Because GNU linkers are not picky about alignment, looks like it is
not uncommon that ELF-generating tools create unaligned files.

There is a performance penalty with this patch on host machines on which
unaligned access is expensive. x86 and AArch64 are fine. ARMv6 is a
problem, but I don't think using ARMv6 machines as hosts is common, so I
believe it's not a real problem.

Differential Revision: https://reviews.llvm.org/D41978

llvm-svn: 322407
2018-01-12 22:09:19 +00:00
..
AArch64 [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
AMDGPU [AMDGPU][MC][GFX8][GFX9] Corrected names of integer v_{add/addc/sub/subrev/subb/subbrev} 2017-11-20 18:24:21 +00:00
ARM Reland r298901 with modifications (reverted in r298932) 2017-04-03 21:50:04 +00:00
Inputs Allow unaligned access to ELF file data structures. 2018-01-12 22:09:19 +00:00
Lanai [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
Mips llvm-dwarfdump: Make -brief the default and add a -verbose option instead. 2017-09-11 23:05:20 +00:00
RISCV [llvm-readobj][RISCV] Pretty-print RISCV e_flags 2017-10-03 08:41:59 +00:00
X86 Use the section name if a STT_SECTION symbol has empty name. 2017-09-06 00:57:53 +00:00
ar-create.test
ar-error.test
archive-delete.test Remove uses of "%T" from test/Object/archive-* tests. 2017-08-20 18:18:44 +00:00
archive-error-tmp.txt
archive-extract-dir.test
archive-extract.test Remove uses of "%T" from test/Object/archive-* tests. 2017-08-20 18:18:44 +00:00
archive-format.test Archives require a symbol table on Solaris, even if empty. 2017-03-14 19:57:13 +00:00
archive-GNU64-write.test Add flag to ArchiveWriter to test GNU64 format more efficiently 2017-12-01 00:54:28 +00:00
archive-long-index.test
archive-move.test Remove uses of "%T" from test/Object/archive-* tests. 2017-08-20 18:18:44 +00:00
archive-pad.test Write to a temporary file in test instead of random file in the test directory. 2017-02-22 09:02:27 +00:00
archive-replace-pos.test
archive-symtab.test llvm-ar: align the first archive member consistently. 2017-09-22 18:36:00 +00:00
archive-thin-create.test llvm/test/Object/archive-thin-create.test: Make sure that %t is empty to stabilize the test. 2016-12-09 11:44:57 +00:00
archive-thin-paths.test Remove uses of "%T" from test/Object/archive-* tests. 2017-08-20 18:18:44 +00:00
archive-thin-read.test Create thin archive in GNU format to fix test on OS X. 2016-03-31 23:07:50 +00:00
archive-toc.test Prefix path when displaying thin archives. 2016-12-04 06:52:30 +00:00
archive-update.test Fix archive-update.test after r311296. 2017-08-20 18:31:30 +00:00
check_binary_output.ll
coff-archive-short.test
coff-archive.test llvm-nm: treat weak undefined as undefined. 2015-07-06 21:36:23 +00:00
coff-empty-drectve.test [COFF] Gracefully handle empty .drectve sections 2017-05-14 18:34:56 +00:00
coff-invalid.test Check that COFF .obj files have sections with zero virtual address spaces. 2015-07-06 14:26:07 +00:00
coff-weak-externals.test llvm-objdump: support dumping AUX records for weak externals 2016-05-26 01:45:12 +00:00
corrupt.test [ELF] Convert ELF.h to Expected<T>. 2016-11-16 05:10:28 +00:00
directory.ll [llvm] Get rid of "%T" expansions 2017-08-15 20:29:24 +00:00
dllimport-globalref.ll Object: Add XFAILed test case for r239560. 2015-06-24 18:03:39 +00:00
dllimport.ll Object: Prepend __imp_ when mangling a dllimport symbol in IRObjectFile. 2015-06-11 21:42:18 +00:00
dyn-rel-relocation.test [llvm-readobj][ELF] Teach llvm-readobj to show dynamic relocation in REL format 2016-01-16 22:40:09 +00:00
dynamic-reloc.test Add a testcase that would have found the bug in r263971. 2016-03-21 21:09:38 +00:00
elf-invalid-phdr.test Added phdr upper bound checks to ElfObject. 2017-10-05 20:01:32 +00:00
elf-reloc-no-sym.test
elf-unknown-type.test [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
invalid-alignment.test Allow unaligned access to ELF file data structures. 2018-01-12 22:09:19 +00:00
invalid.test Allow unaligned access to ELF file data structures. 2018-01-12 22:09:19 +00:00
kext.test
lit.local.cfg Change how symbol sizes are handled in lib/Object. 2015-06-24 10:20:30 +00:00
macho-invalid.test [MachO] Prevent heap overflow when load command extends past EOF 2017-09-13 13:43:01 +00:00
mangle-ir.ll Revert "Change memcpy/memset/memmove to have dest and source alignments." 2015-11-19 05:56:52 +00:00
mri1.test
mri2.test
mri3.test
mri4.test
mri5.test
mri-addlib.test
mri-addmod.test
mri-crlf.test
multi-module.ll Object: Make IRObjectFile own multiple modules and enumerate symbols from all modules. 2016-12-13 20:20:17 +00:00
nm-archive.test Convert two uses of ErrorOr to Expected. 2017-10-10 20:00:07 +00:00
nm-darwin-m.test
nm-error.test
nm-irix6.test
nm-pe-image.test Update comments. 2015-08-06 20:05:27 +00:00
nm-shared-object.test Object: Handle files without a dynamic symbol table. 2017-02-03 16:53:55 +00:00
nm-trivial-object.test [WebAssembly] Fix getSymbolValue() for data symbols 2017-08-31 23:22:44 +00:00
nm-universal-binary.test Add support for Darwin’s 64-bit universal files with 64-bit offsets and sizes for the objects. 2016-06-20 22:16:18 +00:00
nm-weak-global-macho.test
no-section-header-string-table.test [Object][ELF] Handle files with no section header string table. 2015-07-21 21:40:33 +00:00
no-section-table.test [llvm-readobj] - Teach readobj to print DT_FILTER dynamic tag in human readable form. 2017-07-14 16:00:16 +00:00
obj2yaml-coff-long-file-symbol.test
obj2yaml-coff-long-section-name.test
obj2yaml-coff-section-aux-symbol.test
obj2yaml-coff-weak-external.test
obj2yaml-invalid-reloc.test [obj2yaml] Produce correct output for invalid relocations. 2017-01-26 23:12:53 +00:00
obj2yaml-sectiongroup.test [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
obj2yaml.test [ObjectYAML] Map relocation types for COFF ARMNT and ARM64 2017-11-06 07:20:58 +00:00
objc-imageinfo-coff.ll test: fix hexagon build 2017-06-05 21:45:25 +00:00
objc-imageinfo-elf.ll test: fix hexagon build 2017-06-05 21:45:25 +00:00
objc-imageinfo-macho.ll test: fix hexagon build 2017-06-05 21:45:25 +00:00
objdump-export-list.test
objdump-file-header.test
objdump-no-sectionheaders.test
objdump-private-headers.test
objdump-reloc-shared.test Revert "[llvm-objdump] Printing relocations in executable and shared object files. This partially reverts r215844 by removing test objdump-reloc-shared.test which stated GNU objdump doesn't print relocations, it does." 2016-03-21 20:59:15 +00:00
objdump-relocations.test [WebAssembly] Update relocation names to match spec 2017-09-01 17:32:01 +00:00
objdump-section-content.test
objdump-sectionheaders.test
objdump-shndx.test Add a test showing that objdump (and so ObjectFIle) can handle shndx. 2015-08-10 21:00:15 +00:00
objdump-symbol-table.test objdump: Don't print a (always 0) size for MachO symbols. 2015-06-23 15:45:38 +00:00
pr25877.test Handle archives with paths in the names. 2015-12-18 16:07:17 +00:00
readobj-absent.test Avoid SEGFAULT if a requested symbol section is absent. 2015-09-21 19:17:18 +00:00
readobj-elf-versioning.test
readobj-shared-object.test [llvm-readobj] - Teach readobj to print DT_FILTER dynamic tag in human readable form. 2017-07-14 16:00:16 +00:00
readobj.test
relocation-executable.test Reapply r260489. 2016-02-16 15:16:00 +00:00
simple-archive.test
size-trivial-macho.test
stackmap-dump.test [Stackmap] Added callsite counts to emitted function information. 2016-09-14 20:22:03 +00:00
wasm-duplicate-name.test [WebAssembly] Don't allow functions to be named twice 2018-01-12 02:11:31 +00:00
wasm-invalid-start.test [WebAssembly] Fix validation of start function 2017-05-09 17:51:38 +00:00
wasm-missing-version.test [WebAssembly] Fix overflow for input with missing version 2017-08-23 21:36:04 +00:00
yaml2obj-coff-invalid-alignment.test [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-coff-multi-doc.test [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-alignment.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-bits-endian.test [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-file-headers-with-e_flags.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-file-headers.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-multi-doc.test [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-rel-noref.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-rel.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-section-basic.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-section-invalid-size.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-symbol-basic.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-symbol-LocalGlobalWeak.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-elf-symbol-visibility.yaml [yaml2obj] Remove --format option in favor of YAML tags 2016-06-27 19:53:53 +00:00
yaml2obj-invalid.yaml [yaml2obj] - Don't crash on one more invalid document. 2017-09-21 08:25:59 +00:00
yaml2obj-readobj.test