Store pc offset instead of absolute pc in the pc descriptors.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 3164 matching lines @@
  private:
   FINAL_HEAP_OBJECT_IMPLEMENTATION(LocalVarDescriptors, Object);
   friend class Class;
   friend class Object;
 };
 
 
 class PcDescriptors : public Object {
  public:
   void AddDescriptor(intptr_t index,
-                     uword pc,
+                     uword pc_offset,
                      RawPcDescriptors::Kind kind,
                      int64_t deopt_id,
                      int64_t token_pos,  // Or deopt reason.
                      intptr_t try_index) const {  // Or deopt index.
     NoGCScope no_gc;
     RawPcDescriptors::PcDescriptorRec* rec = recAt(index);
-    rec->set_pc(pc);
+    rec->set_pc_offset(pc_offset);
     rec->set_kind(kind);
     ASSERT(Utils::IsInt(32, deopt_id));
     rec->set_deopt_id(static_cast<int32_t>(deopt_id));
     ASSERT(Utils::IsInt(32, token_pos));
     rec->set_token_pos(static_cast<int32_t>(token_pos),
         RecordSizeInBytes() == RawPcDescriptors::kCompressedRecSize);
     ASSERT(Utils::IsInt(16, try_index));
     rec->set_try_index(try_index);
     ASSERT(rec->try_index() == try_index);
     ASSERT(rec->token_pos() == token_pos);
   }
 
   static const intptr_t kMaxBytesPerElement =
       sizeof(RawPcDescriptors::PcDescriptorRec);
   static const intptr_t kMaxElements = kMaxInt32 / kMaxBytesPerElement;
 
   static intptr_t InstanceSize() {
     ASSERT(sizeof(RawPcDescriptors) ==
            OFFSET_OF_RETURNED_VALUE(RawPcDescriptors, data));
     return 0;
   }
   static intptr_t InstanceSize(intptr_t len, intptr_t record_size_in_bytes) {
     ASSERT(0 <= len && len <= kMaxElements);
     return RoundedAllocationSize(
         sizeof(RawPcDescriptors) + (len * record_size_in_bytes));
   }
 
   static RawPcDescriptors* New(intptr_t num_descriptors, bool has_try_index);
 
-  // Returns 0 if not found.
-  uword GetPcForKind(RawPcDescriptors::Kind kind) const;
-
   // Verify (assert) assumptions about pc descriptors in debug mode.
   void Verify(const Function& function) const;
 
   static void PrintHeaderString();
 
   void PrintToJSONObject(JSONObject* jsobj, bool ref) const;
 
   // We would have a VisitPointers function here to traverse the
   // pc descriptors table to visit objects if any in the table.
   // Note: never return a reference to a RawPcDescriptors::PcDescriptorRec
@@ skipping 11 matching lines @@
     bool MoveNext() {
       if (HasNext()) {
         current_ix_ = next_ix_++;
         MoveToMatching();
         return true;
       } else {
         return false;
       }
     }
 
-    uword Pc() const {
+    uword PcOffset() const {
       NoGCScope no_gc;
-      return descriptors_.recAt(current_ix_)->pc();
+      return descriptors_.recAt(current_ix_)->pc_offset();
     }
     intptr_t DeoptId() const {
       NoGCScope no_gc;
       return descriptors_.recAt(current_ix_)->deopt_id();
     }
     intptr_t TokenPos() const {
       NoGCScope no_gc;
       return descriptors_.recAt(current_ix_)->token_pos();
     }
     intptr_t TryIndex() const {
@@ skipping 4431 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_