[WebAssembly] Add WebAssemblyException information analysis

Summary:
A WebAssemblyException object contains BBs that belong to a 'catch' part
of the try-catch-end structure. Because CFGSort requires all the BBs
within a catch part to be sorted together as it does for loops, this
pass calculates the nesting structure of catch part of exceptions in a
function. Now this assumes the use of Windows EH instructions.

Reviewers: dschuff, majnemer

Subscribers: jfb, mgorny, sbc100, jgravelle-google, sunfish, llvm-commits

Differential Revision: https://reviews.llvm.org/D44134

llvm-svn: 335439

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
index b44eb5b..02810d7 100644
--- a/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
+++ b/llvm/lib/Target/WebAssembly/WebAssemblyTargetMachine.cpp
@@ -66,6 +66,7 @@ extern "C" void LLVMInitializeWebAssemblyTarget() {
   initializeWebAssemblyExplicitLocalsPass(PR);
   initializeWebAssemblyFixIrreducibleControlFlowPass(PR);
   initializeWebAssemblyLateEHPreparePass(PR);
+  initializeWebAssemblyExceptionInfoPass(PR);
   initializeWebAssemblyCFGSortPass(PR);
   initializeWebAssemblyCFGStackifyPass(PR);
   initializeWebAssemblyLowerBrUnlessPass(PR);