[turbofan] Introduce prediction for exception handlers.

src/compiler/common-operator.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_COMMON_OPERATOR_H_
 #define V8_COMPILER_COMMON_OPERATOR_H_
 
 #include "src/compiler/frame-states.h"
 #include "src/compiler/machine-type.h"
 #include "src/unique.h"
@@ skipping 16 matching lines @@
 // Prediction hint for branches.
 enum class BranchHint : uint8_t { kNone, kTrue, kFalse };
 
 inline size_t hash_value(BranchHint hint) { return static_cast<size_t>(hint); }
 
 std::ostream& operator<<(std::ostream&, BranchHint);
 
 BranchHint BranchHintOf(const Operator* const);
 
 
+// Prediction whether throw-site is surrounded by any local catch-scope.
+enum class IfExceptionHint { kLocallyUncaught, kLocallyCaught };
+
+size_t hash_value(IfExceptionHint hint);
+
+std::ostream& operator<<(std::ostream&, IfExceptionHint);
+
+
 class SelectParameters final {
  public:
   explicit SelectParameters(MachineType type,
                             BranchHint hint = BranchHint::kNone)
       : type_(type), hint_(hint) {}
 
   MachineType type() const { return type_; }
   BranchHint hint() const { return hint_; }
 
  private:
@@ skipping 40 matching lines @@
 class CommonOperatorBuilder final : public ZoneObject {
  public:
   explicit CommonOperatorBuilder(Zone* zone);
 
   const Operator* Dead();
   const Operator* End(size_t control_input_count);
   const Operator* Branch(BranchHint = BranchHint::kNone);
   const Operator* IfTrue();
   const Operator* IfFalse();
   const Operator* IfSuccess();
-  const Operator* IfException();
+  const Operator* IfException(IfExceptionHint hint);
   const Operator* Switch(size_t control_output_count);
   const Operator* IfValue(int32_t value);
   const Operator* IfDefault();
   const Operator* Throw();
   const Operator* Deoptimize();
   const Operator* Return();
   const Operator* Terminate();
 
   const Operator* Start(int num_formal_parameters);
   const Operator* Loop(int control_input_count);
@@ skipping 37 matching lines @@
   Zone* const zone_;
 
   DISALLOW_COPY_AND_ASSIGN(CommonOperatorBuilder);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_COMMON_OPERATOR_H_