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2021-05-12[WebAssembly] Add TLS data segment flag: WASM_SEG_FLAG_TLSSam Clegg1-0/+2
Previously the linker was relying solely on the name of the segment to imply TLS. Differential Revision: https://reviews.llvm.org/D102202
2021-05-10Reland: "[lld][WebAssembly] Initial support merging string data"Sam Clegg1-2/+4
This change was originally landed in: 5000a1b4b9edeb9e994f2a5b36da8d48599bea49 It was reverted in: 061e071d8c9b98526f35cad55a918a4f1615afd4 This change adds support for a new WASM_SEG_FLAG_STRINGS flag in the object format which works in a similar fashion to SHF_STRINGS in the ELF world. Unlike the ELF linker this support is currently limited: - No support for SHF_MERGE (non-string merging) - Always do full tail merging ("lo" can be merged with "hello") - Only support single byte strings (p2align 0) Like the ELF linker merging is only performed at `-O1` and above. This fixes part of https://bugs.llvm.org/show_bug.cgi?id=48828, although crucially it doesn't not currently support debug sections because they are not represented by data segments (they are custom sections) Differential Revision: https://reviews.llvm.org/D97657
2021-05-10Revert "[lld][WebAssembly] Initial support merging string data"Nico Weber1-4/+2
This reverts commit 5000a1b4b9edeb9e994f2a5b36da8d48599bea49. Breaks tests, see https://reviews.llvm.org/D97657#2749151 Easily repros locally with `ninja check-llvm-mc-webassembly`.
2021-05-10[lld][WebAssembly] Initial support merging string dataSam Clegg1-2/+4
This change adds support for a new WASM_SEG_FLAG_STRINGS flag in the object format which works in a similar fashion to SHF_STRINGS in the ELF world. Unlike the ELF linker this support is currently limited: - No support for SHF_MERGE (non-string merging) - Always do full tail merging ("lo" can be merged with "hello") - Only support single byte strings (p2align 0) Like the ELF linker merging is only performed at `-O1` and above. This fixes part of https://bugs.llvm.org/show_bug.cgi?id=48828, although crucially it doesn't not currently support debug sections because they are not represented by data segments (they are custom sections) Differential Revision: https://reviews.llvm.org/D97657
2020-12-10[WebAssembly] Support COMDAT sections in assembly syntaxDerek Schuff1-1/+9
This CL changes the asm syntax for section flags, making them more like ELF (previously "passive" was the only option). Now we also allow "G" to designate COMDAT group sections. In these sections we set the appropriate comdat flag on function symbols, and also avoid auto-creating a new section for them. This also adds asm-based tests for the changes D92691 to go along with the direct-to-object tests. Differential Revision: https://reviews.llvm.org/D92952 This is a reland of rG4564553b8d8a with a fix to the lit pipeline in llvm/test/MC/WebAssembly/comdat.ll
2020-12-10Revert "[WebAssembly] Support COMDAT sections in assembly syntax"Derek Schuff1-9/+1
This reverts commit 4564553b8d8ab81dc21431a35275581cb42329c8. It broke several buildbots.
2020-12-10[WebAssembly] Support COMDAT sections in assembly syntaxDerek Schuff1-1/+9
This CL changes the asm syntax for section flags, making them more like ELF (previously "passive" was the only option). Now we also allow "G" to designate COMDAT group sections. In these sections we set the appropriate comdat flag on function symbols, and also avoid auto-creating a new section for them. This also adds asm-based tests for the changes D92691 to go along with the direct-to-object tests. Differential Revision: https://reviews.llvm.org/D92952
2020-06-27MCSectionWasm.h - reduce includes to forward declarations. NFC.Simon Pilgrim1-0/+1
2020-04-15[MC] Replace MCSection*::getName() with MCSection::getName(). NFCFangrui Song1-1/+1
I plan to use MCSection::getName() in D78138. Having the function in the base class is also convenient for debugging. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D78251
2020-04-15[MC] Rename MCSection*::getSectionName() to getName(). NFCFangrui Song1-2/+2
A pending change will merge MCSection*::getName() to MCSection::getName().
2019-02-19[WebAssembly] Update MC for bulk memoryThomas Lively1-1/+2
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
2019-02-09[MC] Clean up unused inline function and non-anchor defaulted destructors; NFCIHubert Tong1-2/+0
Summary: Take care of some missing clean-ups that belong with r249548 and some other copy/paste that had happened. In particular, the destructors are no longer vtable anchors after r249548; and `setSectionName` in `MCSectionWasm` is private and unused since r313058 culled its only caller. The destructors are now implicitly defined, and the unused function is removed. Reviewers: nemanjai, jasonliu, grosbach Reviewed By: nemanjai Subscribers: sbc100, aheejin, sunfish, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D57182 llvm-svn: 353597
2019-02-04[WebAssembly] clang-tidy (NFC)Heejin Ahn1-3/+3
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
2019-01-19Update 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
2017-12-13Remove redundant includes from lib/MC.Michael Zolotukhin1-1/+0
llvm-svn: 320624
2017-02-22[WebAssembly] Add skeleton MC support for the Wasm container formatDan Gohman1-0/+97
This just adds the basic skeleton for supporting a new object file format. All of the actual encoding will be implemented in followup patches. Differential Revision: https://reviews.llvm.org/D26722 llvm-svn: 295803
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