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2019-12-11[WebAssembly] Add new `export_name` clang attribute for controlling wasm ↵Sam Clegg1-0/+10
export names This is equivalent to the existing `import_name` and `import_module` attributes which control the import names in the final wasm binary produced by lld. This maps the existing This attribute currently requires a string rather than using the symbol name for a couple of reasons: 1. Avoid confusion with static and dynamic linking which is based on symbol name. Exporting a function from a wasm module using this directive is orthogonal to both static and dynamic linking. 2. Avoids name mangling. Differential Revision: https://reviews.llvm.org/D70520
2019-12-06[WebAssebmly][MC] Support .import_name/.import_field asm directivesSam Clegg1-1/+1
Convert the MC test to use asm rather than bitcode. This is a precursor to https://reviews.llvm.org/D70520. Differential Revision: https://reviews.llvm.org/D70877
2019-09-25[MC][WebAssembly] Error on data symbols in the text section.Sam Clegg1-1/+3
Previously we had an assert but this can actually occur in valid user code so we need to handle this in release builds too. Differential Revision: https://reviews.llvm.org/D67997 llvm-svn: 372934
2019-08-29[WebAssembly] Make __attribute__((used)) not imply export.Dan Gohman1-2/+7
Add an WASM_SYMBOL_NO_STRIP flag, so that __attribute__((used)) doesn't need to imply exporting. When targeting Emscripten, have WASM_SYMBOL_NO_STRIP imply exporting. Differential Revision: https://reviews.llvm.org/D62542 llvm-svn: 370415
2019-08-20[WebAssembly][MC] Fix -Wunused-variable in -DLLVM_ENABLE_ASSERTIONS=off ↵Fangrui Song1-3/+1
builds after r369317 llvm-svn: 369318
2019-08-20[WebAssembly][MC] Simplify WasmObjectWriter::recordRelocation. NFC.Sam Clegg1-43/+15
WebAssembly doesn't support PC relative relocation or relocation expressions that can't be reduced to single symbol. The only support for we have for fixups involving two symbols are when both symbols are defined and withing the same section. In this case evaluateFixup will already have evaluated to the expression before calling recordRelocation. llvm-svn: 369317
2019-08-15[llvm] Migrate llvm::make_unique to std::make_uniqueJonas Devlieghere1-3/+3
Now that we've moved to C++14, we no longer need the llvm::make_unique implementation from STLExtras.h. This patch is a mechanical replacement of (hopefully) all the llvm::make_unique instances across the monorepo. llvm-svn: 369013
2019-07-12Delete dead storesFangrui Song1-1/+0
llvm-svn: 365903
2019-06-26[WebAssembly] Fix list of relocations with addends in lldKeno Fischer1-13/+1
Summary: The list of relocations with addend in lld was missing `R_WASM_MEMORY_ADDR_REL_SLEB`, causing `wasm-ld` to generate corrupted output. This fixes that problem and while we're at it pulls the list of such relocations into the Wasm.h header, to avoid duplicating it in multiple places. Reviewers: sbc100 Differential Revision: https://reviews.llvm.org/D63696 llvm-svn: 364367
2019-04-23Use llvm::stable_sortFangrui Song1-3/+2
While touching the code, simplify if feasible. llvm-svn: 358996
2019-04-12[WebAssembly] Add DataCount section to object filesThomas Lively1-0/+12
Summary: This ensures that object files will continue to validate as WebAssembly modules in the presence of bulk memory operations. Engines that don't support bulk memory operations will not recognize the DataCount section and will report validation errors, but that's ok because object files aren't supposed to be run directly anyway. Reviewers: aheejin, dschuff, sbc100 Subscribers: jgravelle-google, hiraditya, sunfish, rupprecht, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D60623 llvm-svn: 358315
2019-04-04[WebAssembly] Add new explicit relocation types for PIC relocationsSam Clegg1-0/+5
See https://github.com/WebAssembly/tool-conventions/pull/106 Differential Revision: https://reviews.llvm.org/D59907 llvm-svn: 357710
2019-03-28[WebAssembly] Rename wasm fixup kindsSam Clegg1-4/+1
These fixup kinds are not explicitly related to the code section. They are there to signal how to apply the fixup. Also, a couple of other minor wasm cleanups. Differential Revision: https://reviews.llvm.org/D59908 llvm-svn: 357145
2019-03-26[WebAssembly] Initial implementation of PIC code generationSam Clegg1-28/+36
This change implements lowering of references global symbols in PIC mode. This change implements lowering of global references in PIC mode using a new @GOT reference type. @GOT references can be used with function or data symbol names combined with the get_global instruction. In this case the linker will insert the wasm global that stores the address of the symbol (either in memory for data symbols or in the wasm table for function symbols). For now I'm continuing to use the R_WASM_GLOBAL_INDEX_LEB relocation type for this type of reference which means that this relocation type can refer to either a global or a function or data symbol. We could choose to introduce specific relocation types for GOT entries in the future. See the current dynamic linking proposal: https://github.com/WebAssembly/tool-conventions/blob/master/DynamicLinking.md Differential Revision: https://reviews.llvm.org/D54647 llvm-svn: 357022
2019-03-20[WebAssembly] Target features sectionThomas Lively1-1/+10
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
2019-03-04[WebAssembly] Add support for data sections in the assembler.Wouter van Oortmerssen1-1/+1
Summary: This is quite minimal so far, introduce them with .section, fill them with .int8 or .asciz, end with .size Reviewers: dschuff, sbc100, aheejin Subscribers: jgravelle-google, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D58660 llvm-svn: 355321
2019-02-24Fix "enumeral and non-enumeral type in conditional expression" gcc7 warning. ↵Simon Pilgrim1-1/+2
NFCI. llvm-svn: 354745
2019-02-22[WebAssembly] Remove unneeded MCSymbolRefExpr variantsSam Clegg1-6/+7
We record the type of the symbol (event/function/data/global) in the MCWasmSymbol and so it should always be clear how to handle a relocation based on the symbol itself. The exception is a function which still needs the special @TYPEINDEX then the relocation contains the signature rather than the address of the functions. Differential Revision: https://reviews.llvm.org/D58472 llvm-svn: 354697
2019-02-22[WebAssembly] MC: Handle aliases of aliasesSam Clegg1-6/+7
Differential Revision: https://reviews.llvm.org/D58417 llvm-svn: 354694
2019-02-21[WebAssembly] Don't create MSSymbolWasm object for non-symbolsSam Clegg1-9/+4
`__linear_memory` and `__indirect_function_table` are both generated as imports in wasm object files but are actually symbols and don't appear in any symbols table or relocation entry. Indeed we don't have any symbol type to meaningfully represent either of them. Differential Revision: https://reviews.llvm.org/D58487 llvm-svn: 354599
2019-02-19[WebAssembly] Update MC for bulk memoryThomas Lively1-7/+13
Summary: Rename MemoryIndex to InitFlags and implement logic for determining data segment layout in ObjectYAML and MC. Also adds a "passive" flag for the .section assembler directive although this cannot be assembled yet because the assembler does not support data sections. Reviewers: sbc100, aardappel, aheejin, dschuff Subscribers: jgravelle-google, hiraditya, sunfish, rupprecht, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D57938 llvm-svn: 354397
2019-02-07[WebAssembly] Fix imported function symbol names that differ from their ↵Dan Gohman1-1/+4
import names in the .o format Add a flag to allow symbols to have a wasm import name which differs from the linker symbol name, allowing the linker to link code using the import_module attribute. This is the MC/Object portion of the patch. Differential Revision: https://reviews.llvm.org/D57632 llvm-svn: 353474
2019-02-07[WebAssembly] Add symbol flag to the binary format llvm.usedSam Clegg1-0/+2
Summary: Rather than add a new attribute See https://github.com/WebAssembly/tool-conventions/issues/64 Subscribers: dschuff, jgravelle-google, aheejin, sunfish, rupprecht, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D57864 llvm-svn: 353360
2019-02-04[WebAssembly] clang-tidy (NFC)Heejin Ahn1-34/+28
Summary: This patch fixes clang-tidy warnings on wasm-only files. The list of checks used is: `-*,clang-diagnostic-*,llvm-*,misc-*,-misc-unused-parameters,readability-identifier-naming,modernize-*` (LLVM's default .clang-tidy list is the same except it does not have `modernize-*`. But I've seen in multiple CLs in LLVM the modernize style was recommended and code was fixed based on the style, so I added it as well.) The common fixes are: - Variable names start with an uppercase letter - Function names start with a lowercase letter - Use `auto` when you use casts so the type is evident - Use inline initialization for class member variables - Use `= default` for empty constructors / destructors - Use `using` in place of `typedef` Reviewers: sbc100, tlively, aardappel Subscribers: dschuff, sunfish, jgravelle-google, yurydelendik, kripken, MatzeB, mgorny, rupprecht, llvm-commits Differential Revision: https://reviews.llvm.org/D57500 llvm-svn: 353075
2019-02-04[WebAssembly] Rename relocations from R_WEBASSEMBLY_ to R_WASM_Sam Clegg1-34/+34
See https://github.com/WebAssembly/tool-conventions/pull/95. This is less typing and IMHO more readable, and it also fits with our naming around the binary format which tends to use the short name. e.g. include/llvm/BinaryFormat/Wasm.h tools/llvm-objdump/WasmDump.cpp etc.. Differential Revision: https://reviews.llvm.org/D57611 llvm-svn: 353062
2019-02-01[WebAssembly] Add codegen support for the import_field attributeDan Gohman1-10/+10
This adds the LLVM side of https://reviews.llvm.org/D57602 -- the import_field attribute. See that patch for details. Differential Revision: https://reviews.llvm.org/D57603 llvm-svn: 352931
2019-01-31[WebAssembly] MC: Fix for outputing wasm object to /dev/nullSam Clegg1-1/+7
Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D57479 llvm-svn: 352806
2019-01-30[WebAssembly] MC: Use WritePatchableLEB helper function. NFC.Sam Clegg1-33/+30
Subscribers: dschuff, jgravelle-google, aheejin, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D57477 llvm-svn: 352683
2019-01-19Update the file headers across all of the LLVM projects in the monorepoChandler Carruth1-4/+3
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
2019-01-17[WebAssembly] Parse llvm.ident into producers sectionThomas Lively1-17/+30
llvm-svn: 351413
2019-01-17Revert "[WebAssembly] Parse llvm.ident into producers section"Thomas Lively1-30/+17
This reverts commit eccdbba3a02a33e13b5262e92200a33e2ead873d. llvm-svn: 351410
2019-01-16[WebAssembly] Parse llvm.ident into producers sectionThomas Lively1-17/+30
Summary: Everything before the word "version" is the tool, and everything after the word "version" is the version. Reviewers: aheejin, dschuff Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D56742 llvm-svn: 351399
2019-01-16[WebAssembly] Store section alignment as a power of 2Sam Clegg1-1/+1
This change bumps for version number of the wasm object file metadata. See https://github.com/WebAssembly/tool-conventions/pull/92 Differential Revision: https://reviews.llvm.org/D56758 llvm-svn: 351285
2019-01-08[WebAssembly] Massive instruction renamingThomas Lively1-1/+1
Summary: An automated renaming of all the instructions listed at https://github.com/WebAssembly/spec/issues/884#issuecomment-426433329 as well as some similarly-named identifiers. Reviewers: aheejin, dschuff, aardappel Subscribers: sbc100, jgravelle-google, eraman, sunfish, jfb, llvm-commits Differential Revision: https://reviews.llvm.org/D56338 llvm-svn: 350609
2018-11-20[WebAssembly] Remove unused function return types (NFC)Heejin Ahn1-6/+4
Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D54734 llvm-svn: 347277
2018-11-14[WebAssembly] Add support for the event sectionHeejin Ahn1-51/+140
Summary: This adds support for the 'event section' specified in the exception handling proposal. (This was named 'exception section' first, but later renamed to 'event section' to take possibilities of other kinds of events into consideration. But currently we only store exception info in this section.) The event section is added between the global section and the export section. This is for ease of validation per request of the V8 team. This patch: - Creates the event symbol type, which is a weak symbol - Makes 'throw' instruction take the event symbol '__cpp_exception' - Adds relocation support for events - Adds WasmObjectWriter / WasmObjectFile (Reader) support - Adds obj2yaml / yaml2obj support - Adds '.eventtype' printing support Reviewers: dschuff, sbc100, aardappel Subscribers: jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D54096 llvm-svn: 346825
2018-11-02[WebAssembly] Change indices types to unsined int (NFC)Heejin Ahn1-4/+4
Summary: This changes int types to unsigned int in a few places: function indices and `wasm::Valtype` (which is unsigend int enum). Currently these values cannot have negative values anyway, so this should not be a functional change for now. Reviewers: sbc100 Subscribers: dschuff, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D54044 llvm-svn: 346031
2018-10-25Reland "[WebAssembly] LSDA info generation"Heejin Ahn1-1/+3
Summary: This adds support for LSDA (exception table) generation for wasm EH. Wasm EH mostly follows the structure of Itanium-style exception tables, with one exception: a call site table entry in wasm EH corresponds to not a call site but a landing pad. In wasm EH, the VM is responsible for stack unwinding. After an exception occurs and the stack is unwound, the control flow is transferred to wasm 'catch' instruction by the VM, after which the personality function is called from the compiler-generated code. (Refer to WasmEHPrepare pass for more information on this part.) This patch: - Changes wasm.landingpad.index intrinsic to take a token argument, to make this 1:1 match with a catchpad instruction - Stores landingpad index info and catch type info MachineFunction in before instruction selection - Lowers wasm.lsda intrinsic to an MCSymbol pointing to the start of an exception table - Adds WasmException class with overridden methods for table generation - Adds support for LSDA section in Wasm object writer Reviewers: dschuff, sbc100, rnk Subscribers: mgorny, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D52748 llvm-svn: 345345
2018-10-16Revert "[WebAssembly] LSDA info generation"Krasimir Georgiev1-3/+1
This reverts commit r344575. Newly introduced test eh-lsda.ll.test fails with use-after-free under ASAN build. llvm-svn: 344639
2018-10-16[WebAssembly] LSDA info generationHeejin Ahn1-1/+3
Summary: This adds support for LSDA (exception table) generation for wasm EH. Wasm EH mostly follows the structure of Itanium-style exception tables, with one exception: a call site table entry in wasm EH corresponds to not a call site but a landing pad. In wasm EH, the VM is responsible for stack unwinding. After an exception occurs and the stack is unwound, the control flow is transferred to wasm 'catch' instruction by the VM, after which the personality function is called from the compiler-generated code. (Refer to WasmEHPrepare pass for more information on this part.) This patch: - Changes wasm.landingpad.index intrinsic to take a token argument, to make this 1:1 match with a catchpad instruction - Stores landingpad index info and catch type info MachineFunction in before instruction selection - Lowers wasm.lsda intrinsic to an MCSymbol pointing to the start of an exception table - Adds WasmException class with overridden methods for table generation - Adds support for LSDA section in Wasm object writer Reviewers: dschuff, sbc100, rnk Subscribers: mgorny, jgravelle-google, sunfish, llvm-commits Differential Revision: https://reviews.llvm.org/D52748 llvm-svn: 344575
2018-10-03[WebAssembly] Refactor WasmSignature and use it for MCSymbolWasmDerek Schuff1-2/+5
MCContext does not destroy MCSymbols on shutdown. So, rather than putting SmallVectors (which may heap-allocate) inside MCSymbolWasm, use unowned pointer to a WasmSignature instead. The signatures are now owned by the AsmPrinter. Also uses WasmSignature instead of param and result vectors in TargetStreamer, and leaves some TODOs for further simplification. Differential Revision: https://reviews.llvm.org/D52580 llvm-svn: 343733
2018-09-05[WebAssembly] clang-format (NFC)Heejin Ahn1-35/+35
Summary: This patch runs clang-format on all wasm-only files. Reviewers: aardappel, dschuff, sunfish, tlively Subscribers: MatzeB, sbc100, jgravelle-google, llvm-commits Differential Revision: https://reviews.llvm.org/D51447 llvm-svn: 341439
2018-08-22[WebAssembly] Ensure relocation entries are ordered by offsetSam Clegg1-5/+17
wasm-lld expects relocation entries to be sorted by offset. In most cases llvm produces them in order, but the CODE section (which combines many MCSections) is an exception because we order the functions in Symbol order, not in section order. What is more, its not clear weather `recordRelocation` is guaranteed to be called in offset order so this sort of most likely needed in the general case too. Differential Revision: https://reviews.llvm.org/D51065 llvm-svn: 340423
2018-05-30[WebAssembly] MC: Add compile-twice test and fix corresponding bugSam Clegg1-1/+1
Differential Revision: https://reviews.llvm.org/D47398 llvm-svn: 333494
2018-05-21MC: Remove stream and output functions from MCObjectWriter. NFCI.Peter Collingbourne1-2/+1
Part of PR37466. Differential Revision: https://reviews.llvm.org/D47043 llvm-svn: 332864
2018-05-21MC: Have the object writers return the number of bytes written. NFCI.Peter Collingbourne1-3/+6
This removes the last external use of the stream. Part of PR37466. Differential Revision: https://reviews.llvm.org/D47042 llvm-svn: 332863
2018-05-21MC: Change object writers to use endian::Writer. NFCI.Peter Collingbourne1-89/+90
Part of PR37466. Differential Revision: https://reviews.llvm.org/D47040 llvm-svn: 332861
2018-05-21MC: Change MCAssembler::writeSectionData and writeFragmentPadding to take a ↵Peter Collingbourne1-2/+2
raw_ostream. NFCI. Also clean up a couple of hacks where we were writing the section contents to another stream by setting the object writer's stream, writing and setting it back. Part of PR37466. Differential Revision: https://reviews.llvm.org/D47038 llvm-svn: 332858
2018-05-18[MC] Relax .fill size requirementsNirav Dave1-3/+4
Avoid requirement that number of values must be known at assembler time. Fixes PR33586. Reviewers: rnk, peter.smith, echristo, jyknight Subscribers: hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D46703 llvm-svn: 332741
2018-05-17[WebAssembly] MC: Fix typo in commentSam Clegg1-1/+1
llvm-svn: 332632
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