[debugger] use handler table on unoptimized code for exception prediction.

src/frames.cc

Index: src/frames.cc
diff --git a/src/frames.cc b/src/frames.cc
index 161d3ecfaf36af29175c77fc2735f8f965207a7f..fee8e51e4659c64bcba7b79229be7c5b34417d6b 100644
--- a/src/frames.cc
+++ b/src/frames.cc
@@ -982,12 +982,10 @@ int JavaScriptFrame::LookupExceptionHandlerInTable(
     int* stack_depth, HandlerTable::CatchPrediction* prediction) {
   Code* code = LookupCode();
   DCHECK(!code->is_optimized_code());
-  HandlerTable* table = HandlerTable::cast(code->handler_table());
   int pc_offset = static_cast<int>(pc() - code->entry());
-  return table->LookupRange(pc_offset, stack_depth, prediction);
+  return code->LookupRangeInHandlerTable(pc_offset, stack_depth, prediction);
 }
 
-
 void JavaScriptFrame::PrintFunctionAndOffset(JSFunction* function, Code* code,
                                              Address pc, FILE* file,
                                              bool print_line_number) {
@@ -1236,11 +1234,12 @@ void OptimizedFrame::Summarize(List<FrameSummary>* frames,
 
 int OptimizedFrame::LookupExceptionHandlerInTable(
     int* stack_slots, HandlerTable::CatchPrediction* prediction) {
+  DCHECK_NULL(prediction);

[Michael Starzinger, 2016/08/02 11:04:05]

nit: Can we add a comment saying that predictions are unsupported by optimized
code and must be retrieved via a {FrameSummary} instead. Just for posterity.

   Code* code = LookupCode();
   HandlerTable* table = HandlerTable::cast(code->handler_table());
   int pc_offset = static_cast<int>(pc() - code->entry());
   if (stack_slots) *stack_slots = code->stack_slots();
-  return table->LookupReturn(pc_offset, prediction);
+  return table->LookupReturn(pc_offset);
 }
 
 
@@ -1337,9 +1336,8 @@ Object* OptimizedFrame::StackSlotAt(int index) const {
 int InterpretedFrame::LookupExceptionHandlerInTable(
     int* context_register, HandlerTable::CatchPrediction* prediction) {
   BytecodeArray* bytecode = function()->shared()->bytecode_array();
-  HandlerTable* table = HandlerTable::cast(bytecode->handler_table());
-  int pc_offset = GetBytecodeOffset() + 1;  // Point after current bytecode.
-  return table->LookupRange(pc_offset, context_register, prediction);
+  return bytecode->LookupRangeInHandlerTable(GetBytecodeOffset(),
+                                             context_register, prediction);
 }
 
 int InterpretedFrame::GetBytecodeOffset() const {