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Sam Clegg 3b8d2be527 Reland: "[lld][WebAssembly] Initial support merging string data" 
This change was originally landed in: 5000a1b4b9
It was reverted in: 061e071d8c

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
 		2021-05-10 16:03:38 -07:00
..
ArchiveEmitter.cpp [yaml2obj][obj2yaml] - Teach tools to work with regular archives. 2020-10-28 15:27:11 +03:00
ArchiveYAML.cpp [yaml2obj][obj2yaml] - Teach tools to work with regular archives. 2020-10-28 15:27:11 +03:00
CMakeLists.txt llvmbuildectomy - replace llvm-build by plain cmake 2020-11-13 10:35:24 +01:00
COFFEmitter.cpp [llvm] Don't include StringSwitch.h where unnecessary (NFC) 2021-01-21 19:59:48 -08:00
COFFYAML.cpp
…
CodeViewYAMLDebugSections.cpp
…
CodeViewYAMLSymbols.cpp [COFF][ARM] Fix CodeView for Windows on 32bit ARM targets. 2020-10-19 22:16:16 -07:00
CodeViewYAMLTypeHashing.cpp
…
CodeViewYAMLTypes.cpp [lld] Fixed CodeView GuidAdapter::format to handle GUID bytes in the right order. 2021-04-09 05:29:14 +04:00
DWARFEmitter.cpp [llvm] Populate std::vector at construction time (NFC) 2021-01-18 10:16:33 -08:00
DWARFYAML.cpp Reland "[yaml2obj][ELF] - Simplify the code that performs sections validation." 2020-10-20 16:25:33 +03:00
ELFEmitter.cpp Read NumBlocks as uint64_t. 2021-03-08 16:46:13 -08:00
ELFYAML.cpp Reland "AMDGPU/llvm-readobj: Add missing tests for note parsing/displaying" 2021-05-02 22:56:17 -04:00
MachOEmitter.cpp [llvm] Populate std::vector at construction time (NFC) 2021-01-18 10:16:33 -08:00
MachOYAML.cpp Reland "[yaml2obj][ELF] - Simplify the code that performs sections validation." 2020-10-20 16:25:33 +03:00
MinidumpEmitter.cpp
…
MinidumpYAML.cpp Reland "[yaml2obj][ELF] - Simplify the code that performs sections validation." 2020-10-20 16:25:33 +03:00
ObjectYAML.cpp [yaml2obj][obj2yaml] - Teach tools to work with regular archives. 2020-10-28 15:27:11 +03:00
WasmEmitter.cpp [WebAssembly] Rename WasmLimits::Initial to ::Minimum. NFC. 2021-03-24 09:10:11 +01:00
WasmYAML.cpp Reland: "[lld][WebAssembly] Initial support merging string data" 2021-05-10 16:03:38 -07:00
XCOFFYAML.cpp
…
YAML.cpp
…
yaml2obj.cpp [yaml2obj][obj2yaml] - Teach tools to work with regular archives. 2020-10-28 15:27:11 +03:00