[all-commits] [llvm/llvm-project] 9e4ead: [WebAssembly] Update basic EH instructions for the...

[Heejin Ahn via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 9e4eadeb135d140b3a9e499354472170017cbe58
      https://github.com/llvm/llvm-project/commit/9e4eadeb135d140b3a9e499354472170017cbe58
  Author: Heejin Ahn <aheejin at gmail.com>
  Date:   2021-01-09 (Sat, 09 Jan 2021)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
    M llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyISD.def
    M llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyInstrControl.td
    M llvm/lib/Target/WebAssembly/WebAssemblyInstrInfo.td
    M llvm/lib/Target/WebAssembly/WebAssemblyLateEHPrepare.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyRegStackify.cpp
    M llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
    M llvm/test/CodeGen/WebAssembly/cfg-stackify-eh.ll
    M llvm/test/CodeGen/WebAssembly/eh-labels.mir
    M llvm/test/CodeGen/WebAssembly/eh-lsda.ll
    M llvm/test/CodeGen/WebAssembly/exception.ll
    M llvm/test/MC/WebAssembly/annotations.s
    M llvm/test/MC/WebAssembly/basic-assembly.s
    M llvm/unittests/Target/WebAssembly/WebAssemblyExceptionInfoTest.cpp

  Log Message:
  -----------
  [WebAssembly] Update basic EH instructions for the new spec

This implements basic instructions for the new spec.

- Adds new versions of instructions: `catch`, `catch_all`, and `rethrow`
- Adds support for instruction selection for the new instructions
 - `catch` needs a custom routine for the same reason `throw` needs one,
   to encode `__cpp_exception` tag symbol.
- Updates `WebAssembly::isCatch` utility function to include `catch_all`
  and Change code that compares an instruction's opcode with `catch` to
  use that function.
- LateEHPrepare
  - Previously in LateEHPrepare we added `catch` instruction to both
    `catchpad`s (for user catches) and `cleanuppad`s (for destructors).
    In the new version `catch` is generated from `llvm.catch` intrinsic
    in instruction selection phase, so we only need to add `catch_all`
    to the beginning of cleanup pads.
  - `catch` is generated from instruction selection, but we need to
    hoist the `catch` instruction to the beginning of every EH pad,
    because `catch` can be in the middle of the EH pad or even in a
    split BB from it after various code transformations.
  - Removes `addExceptionExtraction` function, which was used to
    generate `br_on_exn` before.
- CFGStackfiy: Deletes `fixUnwindMismatches` function. Running this
  function on the new instruction causes crashes, and the new version
  will be added in a later CL, whose contents will be completely
  different. So deleting the whole function will make the diff easier to
  read.
- Reenables all disabled tests in exception.ll and eh-lsda.ll and a
  single basic test in cfg-stackify-eh.ll.
- Updates existing tests to use the new assembly format. And deletes
  `br_on_exn` instructions from the tests and FileCheck lines.

Reviewed By: dschuff, tlively

Differential Revision: https://reviews.llvm.org/D94040