[turbofan] Introduce prediction for exception handlers.

src/objects.cc

 // Copyright 2013 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.
 
 #include <iomanip>
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 8620 matching lines @@
       innermost_handler = handler_offset;
       innermost_start = start_offset;
       *stack_depth_out = stack_depth;
     }
   }
   return innermost_handler;
 }
 
 
 // TODO(turbofan): Make sure table is sorted and use binary search.
-int HandlerTable::LookupReturn(int pc_offset) {
+int HandlerTable::LookupReturn(int pc_offset, CatchPrediction* prediction) {
   for (int i = 0; i < length(); i += kReturnEntrySize) {
     int return_offset = Smi::cast(get(i + kReturnOffsetIndex))->value();
-    int handler_offset = Smi::cast(get(i + kReturnHandlerIndex))->value();
-    if (pc_offset == return_offset) return handler_offset;
+    int handler_field = Smi::cast(get(i + kReturnHandlerIndex))->value();
+    if (pc_offset == return_offset) {
+      *prediction = HandlerPredictionField::decode(handler_field);
+      return HandlerOffsetField::decode(handler_field);
+    }
   }
   return -1;
 }
 
 
 #ifdef DEBUG
 bool DescriptorArray::IsEqualTo(DescriptorArray* other) {
   if (IsEmpty()) return other->IsEmpty();
   if (other->IsEmpty()) return false;
   if (length() != other->length()) return false;
@@ skipping 3171 matching lines @@
     int pc_end = Smi::cast(get(i + kRangeEndIndex))->value();
     int handler = Smi::cast(get(i + kRangeHandlerIndex))->value();
     int depth = Smi::cast(get(i + kRangeDepthIndex))->value();
     os << "  (" << std::setw(4) << pc_start << "," << std::setw(4) << pc_end
        << ")  ->  " << std::setw(4) << handler << " (depth=" << depth << ")\n";
   }
 }
 
 
 void HandlerTable::HandlerTableReturnPrint(std::ostream& os) {
-  os << "   off      hdlr\n";
+  os << "   off      hdlr (c)\n";
   for (int i = 0; i < length(); i += kReturnEntrySize) {
     int pc_offset = Smi::cast(get(i + kReturnOffsetIndex))->value();
-    int handler = Smi::cast(get(i + kReturnHandlerIndex))->value();
+    int handler_field = Smi::cast(get(i + kReturnHandlerIndex))->value();
+    int handler_offset = HandlerOffsetField::decode(handler_field);
+    CatchPrediction prediction = HandlerPredictionField::decode(handler_field);
     os << "  " << std::setw(4) << pc_offset << "  ->  " << std::setw(4)
-       << handler << "\n";
+       << handler_offset << " (" << prediction << ")\n";
   }
 }
 
 
 const char* Code::ICState2String(InlineCacheState state) {
   switch (state) {
     case UNINITIALIZED: return "UNINITIALIZED";
     case PREMONOMORPHIC: return "PREMONOMORPHIC";
     case MONOMORPHIC: return "MONOMORPHIC";
     case PROTOTYPE_FAILURE:
@@ skipping 5511 matching lines @@
 void PropertyCell::SetValueWithInvalidation(Handle<PropertyCell> cell,
                                             Handle<Object> new_value) {
   if (cell->value() != *new_value) {
     cell->set_value(*new_value);
     Isolate* isolate = cell->GetIsolate();
     cell->dependent_code()->DeoptimizeDependentCodeGroup(
         isolate, DependentCode::kPropertyCellChangedGroup);
   }
 }
 } }  // namespace v8::internal