[all-commits] [llvm/llvm-project] 296861: [WebAssembly] Fix delegate's argument computation

[Heejin Ahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 2968611fdaff215ff1e0064a3c147229211edf9c
      https://github.com/llvm/llvm-project/commit/2968611fdaff215ff1e0064a3c147229211edf9c
  Author: Heejin Ahn <aheejin at gmail.com>
  Date:   2021-02-11 (Thu, 11 Feb 2021)

  Changed paths:
    M llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp
    M llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.h
    M llvm/lib/Target/WebAssembly/WebAssemblyCFGStackify.cpp
    M llvm/test/CodeGen/WebAssembly/cfg-stackify-eh.ll

  Log Message:
  -----------
  [WebAssembly] Fix delegate's argument computation

I previously assumed `delegate`'s immediate argument computation
followed a different rule than that of branches, but we agreed to make
it the same
(https://github.com/WebAssembly/exception-handling/issues/146). This
removes the need for a separate `DelegateStack` in both CFGStackify and
InstPrinter.

When computing the immediate argument, we use a different function for
`delegate` computation because in MIR `DELEGATE`'s instruction's
destination is the destination catch BB or delegate BB, and when it is a
catch BB, we need an additional step of getting its corresponding `end`
marker.

Reviewed By: tlively, dschuff

Differential Revision: https://reviews.llvm.org/D96525