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Thomas Lively f6f4f84378 [WebAssembly] Target features section 
Summary:
Implements a new target features section in assembly and object files
that records what features are used, required, and disallowed in
WebAssembly objects. The linker uses this information to ensure that
all objects participating in a link are feature-compatible and records
the set of used features in the output binary for use by optimizers
and other tools later in the toolchain.

The "atomics" feature is always required or disallowed to prevent
linking code with stripped atomics into multithreaded binaries. Other
features are marked used if they are enabled globally or on any
function in a module.

Future CLs will add linker flags for ignoring feature compatibility
checks and for specifying the set of allowed features, implement using
the presence of the "atomics" feature to control the type of memory
and segments in the linked binary, and add front-end flags for
relaxing the linkage policy for atomics.

Reviewers: aheejin, sbc100, dschuff

Subscribers: jgravelle-google, hiraditya, sunfish, mgrang, jfb, jdoerfert, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D59173

llvm-svn: 356610
 		2019-03-20 20:26:45 +00:00
..
bugpoint [opaque pointer types] Pass value type to LoadInst creation. 2019-02-01 20:44:24 +00:00
bugpoint-passes Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
dsymutil Revert "[DWARFFormValue] Cleanup DWARFFormValue interface. (2/2) (NFC)" 2019-03-02 01:10:00 +00:00
gold Reland "[Remarks] Add -foptimization-record-passes to filter remark emission" 2019-03-12 21:22:27 +00:00
llc Reland "[Remarks] Add -foptimization-record-passes to filter remark emission" 2019-03-12 21:22:27 +00:00
lli [opaque pointer types] Add a FunctionCallee wrapper type, and use it. 2019-02-01 02:28:03 +00:00
llvm-ar [llvm-ar] Support N [count] modifier 2019-03-19 16:09:54 +00:00
llvm-as Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-as-fuzzer Fix some include order and file headers issues. NFC 2019-02-21 07:42:31 +00:00
llvm-bcanalyzer Implementation of asm-goto support in LLVM 2019-02-08 20:48:56 +00:00
llvm-c-test [LLVM-C] Add Bindings to GlobalIFunc 2019-02-05 18:05:44 +00:00
llvm-cat Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-cfi-verify [DebugInfo] add SectionedAddress to DebugInfo interfaces. 2019-02-27 13:17:36 +00:00
llvm-config llvm-config: Include -stdlib= in --cxxflags 2019-02-28 17:31:59 +00:00
llvm-cov Speeding up llvm-cov export with multithreaded renderFiles implementation. 2019-03-14 17:49:27 +00:00
llvm-cvtres Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-cxxdump Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-cxxfilt [llvm-cxxfilt] Re-enable split and demangle stdin input on certain non-alphanumerics. 2019-02-27 21:39:11 +00:00
llvm-cxxmap Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-diff Fix some include order and file headers issues. NFC 2019-02-21 07:42:31 +00:00
llvm-dis Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-dwarfdump llvm-dwarfdump: Add new variable, parameter and inlining statistics; also function source location statistics. 2019-03-01 23:51:54 +00:00
llvm-dwp [llvm-dwp] Use color-formatted error reporting 2019-02-12 20:37:33 +00:00
llvm-elfabi Fix some include order and file headers issues. NFC 2019-02-21 07:42:31 +00:00
llvm-exegesis [llvm-exegesis] Separate tool options into three categories. 2019-03-18 11:32:37 +00:00
llvm-extract Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-go Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-isel-fuzzer Fix file header issues in fuzzers. NFC 2019-02-21 07:57:14 +00:00
llvm-itanium-demangle-fuzzer Fix file header issues in fuzzers. NFC 2019-02-21 07:57:14 +00:00
llvm-jitlistener Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-link Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-lto Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-lto2 Reland "[Remarks] Add -foptimization-record-passes to filter remark emission" 2019-03-12 21:22:27 +00:00
llvm-mc [DWARF] Make -g with empty assembler source work better. 2019-03-01 20:58:04 +00:00
llvm-mc-assemble-fuzzer Fix some include order and file headers issues. NFC 2019-02-21 07:42:31 +00:00
llvm-mc-disassemble-fuzzer Fix file header issues in fuzzers. NFC 2019-02-21 07:57:14 +00:00
llvm-mca [llvm-mca] Emit a message when no bottlenecks are identified. 2019-03-07 19:34:44 +00:00
llvm-microsoft-demangle-fuzzer Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-modextract Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-mt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-nm Improve "llvm-nm -f sysv" output for Elf files 2019-03-08 22:00:50 +00:00
llvm-objcopy [llvm-objcopy] - Use replaceSectionReferences to update the sections for symbols in symbol table. 2019-03-20 13:57:47 +00:00
llvm-objdump [llvm-objdump] Should print unknown d_tag in hex format 2019-03-02 04:20:28 +00:00
llvm-opt-fuzzer Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-opt-report Reland "[Remarks] Add a new Remark / RemarkParser abstraction" 2019-03-19 21:11:07 +00:00
llvm-pdbutil Add Swift enumerator value for CodeView::SourceLanguage 2019-03-11 23:27:59 +00:00
llvm-profdata [llvm-profdata] Deleted unused Cutoffs added by D16005 2019-03-15 10:43:51 +00:00
llvm-rc Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-readobj [AMDGPU] Factored PAL metadata handling out into its own class 2019-03-20 17:42:00 +00:00
llvm-rtdyld [DebugInfo] add SectionedAddress to DebugInfo interfaces. 2019-02-27 13:17:36 +00:00
llvm-shlib Use response file when generating LLVM-C.dll 2019-03-19 09:14:09 +00:00
llvm-size Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-special-case-list-fuzzer Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-split Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-stress Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-strings Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-symbolizer Attempt to fix buildbot after r354972 [#2]. NFCI. 2019-03-01 10:15:18 +00:00
llvm-undname Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
llvm-xray [DebugInfo] add SectionedAddress to DebugInfo interfaces. 2019-02-27 13:17:36 +00:00
llvm-yaml-numeric-parser-fuzzer Fix file header issues in fuzzers. NFC 2019-02-21 07:57:14 +00:00
lto Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
msbuild Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
obj2yaml [WebAssembly] Target features section 2019-03-20 20:26:45 +00:00
opt Reland "[Remarks] Add -foptimization-record-passes to filter remark emission" 2019-03-12 21:22:27 +00:00
opt-viewer [opt-viewer] Add --filter option to select remarks for displaying. 2019-02-06 18:43:37 +00:00
remarks-shlib Reland "[Remarks] Add a new Remark / RemarkParser abstraction" 2019-03-19 21:11:07 +00:00
sancov [DebugInfo] add SectionedAddress to DebugInfo interfaces. 2019-02-27 13:17:36 +00:00
sanstats [DebugInfo] add SectionedAddress to DebugInfo interfaces. 2019-02-27 13:17:36 +00:00
verify-uselistorder Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00
xcode-toolchain [CMake] Use LLVM_ENABLE_IDE instead of CMAKE_CONFIGURATION_TYPES 2018-10-15 21:20:02 +00:00
yaml2obj [WebAssembly] Target features section 2019-03-20 20:26:45 +00:00
CMakeLists.txt Fix most of LLVM's tests with LLVM_ENABLE_PIC=OFF 2019-01-16 20:44:36 +00:00
LLVMBuild.txt Update the file headers across all of the LLVM projects in the monorepo 2019-01-19 08:50:56 +00:00