[wasm] Trap handling: ProtectedLoad instruction

src/compiler/machine-operator.cc

Index: src/compiler/machine-operator.cc
diff --git a/src/compiler/machine-operator.cc b/src/compiler/machine-operator.cc
index 81805d7b36296ec517e2ef1ec8bff73d764dba4c..32d2c4974120bd66c44c3f76f54f4808a4b90e78 100644
--- a/src/compiler/machine-operator.cc
+++ b/src/compiler/machine-operator.cc
@@ -36,6 +36,7 @@ std::ostream& operator<<(std::ostream& os, StoreRepresentation rep) {
 
 LoadRepresentation LoadRepresentationOf(Operator const* op) {
   DCHECK(IrOpcode::kLoad == op->opcode() ||
+         IrOpcode::kProtectedLoad == op->opcode() ||
          IrOpcode::kAtomicLoad == op->opcode());
   return OpParameter<LoadRepresentation>(op);
 }
@@ -500,9 +501,18 @@ struct MachineOperatorGlobalCache {
               Operator::kNoDeopt | Operator::kNoThrow | Operator::kNoWrite,  \
               "CheckedLoad", 3, 1, 1, 1, 1, 0, MachineType::Type()) {}       \
   };                                                                         \
+  struct ProtectedLoad##Type##Operator final                                 \
+      : public Operator1<ProtectedLoadRepresentation> {                      \
+    ProtectedLoad##Type##Operator()                                          \
+        : Operator1<ProtectedLoadRepresentation>(                            \
+              IrOpcode::kProtectedLoad,                                      \
+              Operator::kNoDeopt | Operator::kNoThrow | Operator::kNoWrite,  \
+              "ProtectedLoad", 4, 1, 1, 1, 1, 0, MachineType::Type()) {}     \
+  };                                                                         \
   Load##Type##Operator kLoad##Type;                                          \
   UnalignedLoad##Type##Operator kUnalignedLoad##Type;                        \
-  CheckedLoad##Type##Operator kCheckedLoad##Type;
+  CheckedLoad##Type##Operator kCheckedLoad##Type;                            \
+  ProtectedLoad##Type##Operator kProtectedLoad##Type;
   MACHINE_TYPE_LIST(LOAD)
 #undef LOAD
 
@@ -697,6 +707,17 @@ const Operator* MachineOperatorBuilder::Load(LoadRepresentation rep) {
   return nullptr;
 }
 
+const Operator* MachineOperatorBuilder::ProtectedLoad(LoadRepresentation rep) {
+#define LOAD(Type)                       \
+  if (rep == MachineType::Type()) {      \
+    return &cache_.kProtectedLoad##Type; \
+  }
+  MACHINE_TYPE_LIST(LOAD)
+#undef LOAD
+  UNREACHABLE();
+  return nullptr;
+}
+
 const Operator* MachineOperatorBuilder::StackSlot(MachineRepresentation rep) {
 #define STACKSLOT(Type)                              \
   if (rep == MachineType::Type().representation()) { \