[WebAssembly] Add WasmEHFuncInfo for unwind destination information

Summary:
Add WasmEHFuncInfo and routines to calculate and fill in this struct to
keep track of unwind destination information. This will be used in
other EH related passes.

Reviewers: dschuff

Subscribers: sbc100, jgravelle-google, sunfish, chrib, llvm-commits

Differential Revision: https://reviews.llvm.org/D48263

llvm-svn: 335005

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/MachineFunction.cpp b/llvm/lib/CodeGen/MachineFunction.cpp
index e47aeb64910..a376614ade9 100644
--- a/llvm/lib/CodeGen/MachineFunction.cpp
+++ b/llvm/lib/CodeGen/MachineFunction.cpp
@@ -37,6 +37,7 @@
 #include "llvm/CodeGen/TargetLowering.h"
 #include "llvm/CodeGen/TargetRegisterInfo.h"
 #include "llvm/CodeGen/TargetSubtargetInfo.h"
+#include "llvm/CodeGen/WasmEHFuncInfo.h"
 #include "llvm/CodeGen/WinEHFuncInfo.h"
 #include "llvm/Config/llvm-config.h"
 #include "llvm/IR/Attributes.h"
@@ -175,6 +176,11 @@ void MachineFunction::init() {
     WinEHInfo = new (Allocator) WinEHFuncInfo();
   }
 
+  if (isScopedEHPersonality(classifyEHPersonality(
+          F.hasPersonalityFn() ? F.getPersonalityFn() : nullptr))) {
+    WasmEHInfo = new (Allocator) WasmEHFuncInfo();
+  }
+
   assert(Target.isCompatibleDataLayout(getDataLayout()) &&
          "Can't create a MachineFunction using a Module with a "
          "Target-incompatible DataLayout attached\n");