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Rui Ueyama 6371180cd4 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
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ar-error.test
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archive-GNU64-write.test Add flag to ArchiveWriter to test GNU64 format more efficiently 2017-12-01 00:54:28 +00:00
archive-delete.test Remove uses of "%T" from test/Object/archive-* tests. 2017-08-20 18:18:44 +00:00
archive-error-tmp.txt
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archive-extract-dir.test
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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-long-index.test
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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
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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
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coff-archive-short.test
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coff-archive.test
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coff-empty-drectve.test [COFF] Gracefully handle empty .drectve sections 2017-05-14 18:34:56 +00:00
coff-invalid.test
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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
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dllimport.ll
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dyn-rel-relocation.test
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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
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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
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lit.local.cfg
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macho-invalid.test [MachO] Prevent heap overflow when load command extends past EOF 2017-09-13 13:43:01 +00:00
mangle-ir.ll
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mri-addlib.test
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mri-addmod.test
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mri-crlf.test
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mri1.test
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mri2.test
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mri3.test
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mri4.test
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mri5.test
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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
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nm-error.test
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nm-irix6.test
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nm-pe-image.test
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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
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no-section-header-string-table.test
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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
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obj2yaml-coff-long-section-name.test
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obj2yaml-coff-section-aux-symbol.test
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obj2yaml-coff-weak-external.test
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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
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objdump-file-header.test
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objdump-no-sectionheaders.test
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objdump-private-headers.test
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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
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objdump-sectionheaders.test
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objdump-shndx.test
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objdump-symbol-table.test
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pr25877.test
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readobj-absent.test
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readobj-elf-versioning.test
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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
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relocation-executable.test
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simple-archive.test
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size-trivial-macho.test
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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-LocalGlobalWeak.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-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
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