Switch full-codegen from StackHandlers to handler table.

src/objects.h

 // Copyright 2012 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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 920 matching lines @@
   V(JSGeneratorObject)             \
   V(JSModule)                      \
   V(LayoutDescriptor)              \
   V(Map)                           \
   V(DescriptorArray)               \
   V(TransitionArray)               \
   V(TypeFeedbackVector)            \
   V(DeoptimizationInputData)       \
   V(DeoptimizationOutputData)      \
   V(DependentCode)                 \
+  V(HandlerTable)                  \
   V(FixedArray)                    \
   V(FixedDoubleArray)              \
   V(WeakFixedArray)                \
   V(ArrayList)                     \
   V(ConstantPoolArray)             \
   V(Context)                       \
   V(ScriptContextTable)            \
   V(NativeContext)                 \
   V(ScopeInfo)                     \
   V(JSFunction)                    \
@@ skipping 4040 matching lines @@
                                               PretenureFlag pretenure);
 
   DECLARE_CAST(DeoptimizationOutputData)
 
 #if defined(OBJECT_PRINT) || defined(ENABLE_DISASSEMBLER)
   void DeoptimizationOutputDataPrint(std::ostream& os);  // NOLINT
 #endif
 };
 
 
+// HandlerTable is a fixed array containing entries for exception handlers in
+// the code object it is associated with. The tables comes in two flavors:
+// 1) Based on ranges: Used for unoptimized code. Contains one entry per
+//    exception handler and a range representing the try-block covered by that
+//    handler. Layout looks as follows:
+//      [ range-start , range-end , handler-offset , stack-depth ]
+// 2) Based on return addresses: Used for turbofanned code. Contains one entry
+//    per call-site that could throw an exception. Layout looks as follows:
+//      [ return-address-offset , handler-offset ]
+class HandlerTable : public FixedArray {
+ public:
+  // Accessors for handler table based on ranges.
+  void SetRangeStart(int index, int value) {
+    set(index * kRangeEntrySize + kRangeStartIndex, Smi::FromInt(value));
+  }
+  void SetRangeEnd(int index, int value) {
+    set(index * kRangeEntrySize + kRangeEndIndex, Smi::FromInt(value));
+  }
+  void SetRangeHandler(int index, int value) {
+    set(index * kRangeEntrySize + kRangeHandlerIndex, Smi::FromInt(value));
+  }
+  void SetRangeDepth(int index, int value) {
+    set(index * kRangeEntrySize + kRangeDepthIndex, Smi::FromInt(value));
+  }
+
+  // Accessors for handler table based on return addresses.
+  void SetReturnOffset(int index, int value) {
+    set(index * kReturnEntrySize + kReturnOffsetIndex, Smi::FromInt(value));
+  }
+  void SetReturnHandler(int index, int value) {
+    set(index * kReturnEntrySize + kReturnHandlerIndex, Smi::FromInt(value));
+  }
+
+  // Lookup handler in a table based on ranges.
+  int LookupRange(int pc_offset, int* stack_depth);
+
+  // Lookup handler in a table based on return addresses.
+  int LookupReturn(int pc_offset);
+
+  // Returns the required length of the underlying fixed array.
+  static int LengthForRange(int entries) { return entries * kRangeEntrySize; }
+  static int LengthForReturn(int entries) { return entries * kReturnEntrySize; }
+
+  DECLARE_CAST(HandlerTable)
+
+#if defined(OBJECT_PRINT) || defined(ENABLE_DISASSEMBLER)
+  void HandlerTableRangePrint(std::ostream& os);   // NOLINT
+  void HandlerTableReturnPrint(std::ostream& os);  // NOLINT
+#endif
+
+ private:
+  // Layout description for handler table based on ranges.
+  static const int kRangeStartIndex = 0;
+  static const int kRangeEndIndex = 1;
+  static const int kRangeHandlerIndex = 2;
+  static const int kRangeDepthIndex = 3;
+  static const int kRangeEntrySize = 4;
+
+  // Layout description for handler table based on return addresses.
+  static const int kReturnOffsetIndex = 0;
+  static const int kReturnHandlerIndex = 1;
+  static const int kReturnEntrySize = 2;
+};
+
+
 // Forward declaration.
 class Cell;
 class PropertyCell;
 class SafepointEntry;
 class TypeFeedbackInfo;
 
 // Code describes objects with on-the-fly generated machine code.
 class Code: public HeapObject {
  public:
   // Opaque data type for encapsulating code flags like kind, inline
@@ skipping 2262 matching lines @@
   // cannot be resumed.
   inline int continuation() const;
   inline void set_continuation(int continuation);
   inline bool is_closed();
   inline bool is_executing();
   inline bool is_suspended();
 
   // [operand_stack]: Saved operand stack.
   DECL_ACCESSORS(operand_stack, FixedArray)
 
-  // [stack_handler_index]: Index of first stack handler in operand_stack, or -1
-  // if the captured activation had no stack handler.
-  inline int stack_handler_index() const;
-  inline void set_stack_handler_index(int stack_handler_index);
-
   DECLARE_CAST(JSGeneratorObject)
 
   // Dispatched behavior.
   DECLARE_PRINTER(JSGeneratorObject)
   DECLARE_VERIFIER(JSGeneratorObject)
 
   // Magic sentinel values for the continuation.
   static const int kGeneratorExecuting = -1;
   static const int kGeneratorClosed = 0;
 
   // Layout description.
   static const int kFunctionOffset = JSObject::kHeaderSize;
   static const int kContextOffset = kFunctionOffset + kPointerSize;
   static const int kReceiverOffset = kContextOffset + kPointerSize;
   static const int kContinuationOffset = kReceiverOffset + kPointerSize;
   static const int kOperandStackOffset = kContinuationOffset + kPointerSize;
-  static const int kStackHandlerIndexOffset =
-      kOperandStackOffset + kPointerSize;
-  static const int kSize = kStackHandlerIndexOffset + kPointerSize;
+  static const int kSize = kOperandStackOffset + kPointerSize;
 
   // Resume mode, for use by runtime functions.
   enum ResumeMode { NEXT, THROW };
 
   // Yielding from a generator returns an object with the following inobject
   // properties.  See Context::iterator_result_map() for the map.
   static const int kResultValuePropertyIndex = 0;
   static const int kResultDonePropertyIndex = 1;
   static const int kResultPropertyCount = 2;
 
@@ skipping 3614 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_