[PATCH] D62542: [WebAssembly] Make Emscripten-specific behavior specific to the Emscripten target

[Dan Gohman via Phabricator via llvm-commits]

sunfish created this revision.
sunfish added reviewers: sbc100, dschuff, aheejin.
Herald added subscribers: rupprecht, jgravelle-google.
Herald added a project: LLVM.

Make some behaviors added for Emscripten compatibility conditional on the target being Emscripten.

- Add an WASM_SYMBOL_IMPLICITLY_USED flag, so that __attribute__((used)) doesn't need to imply exporting. When targeting Emscripten, have WASM_SYMBOL_IMPLICITLY_USED imply exporting.
- Limit PIC support to the Emscripten target, since the current PIC support is Emscripten-specific.


Repository:
  rL LLVM

https://reviews.llvm.org/D62542

Files:
  include/llvm/BinaryFormat/Wasm.h
  include/llvm/MC/MCSymbolWasm.h
  include/llvm/MC/MCWasmObjectWriter.h
  lib/MC/MCWasmObjectTargetWriter.cpp
  lib/MC/MCWasmStreamer.cpp
  lib/MC/WasmObjectWriter.cpp
  lib/ObjectYAML/WasmYAML.cpp
  lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
  lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
  lib/Target/WebAssembly/MCTargetDesc/WebAssemblyWasmObjectWriter.cpp
  lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
  test/CodeGen/WebAssembly/address-offsets.ll
  test/CodeGen/WebAssembly/call-pic.ll
  test/CodeGen/WebAssembly/load-store-pic.ll
  test/MC/WebAssembly/no-dead-strip.ll
  tools/llvm-readobj/WasmDumper.cpp

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