Delta encode pc descriptors, and combine pc kind and try index into single field.

runtime/vm/raw_object.cc

 // 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.
 
 #include "vm/raw_object.h"
 
 #include "vm/class_table.h"
 #include "vm/dart.h"
 #include "vm/freelist.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/visitor.h"
 
 
 namespace dart {
 
 #if defined(DEBUG)
 DEFINE_FLAG(bool, validate_overwrite, true, "Verify overwritten fields.");
 #endif  // DEBUG
 
-const intptr_t RawPcDescriptors::kFullRecSize =
-    sizeof(RawPcDescriptors::PcDescriptorRec);
-const intptr_t RawPcDescriptors::kCompressedRecSize =
-    sizeof(RawPcDescriptors::CompressedPcDescriptorRec);
-
 bool RawObject::IsVMHeapObject() const {
   return Dart::vm_isolate()->heap()->Contains(ToAddr(this));
 }
 
 
 void RawObject::Validate(Isolate* isolate) const {
   if (Object::void_class_ == reinterpret_cast<RawClass*>(kHeapObjectTag)) {
     // Validation relies on properly initialized class classes. Skip if the
     // VM is still being initialized.
     return;
@@ skipping 99 matching lines @@
     case kTypeArgumentsCid: {
       const RawTypeArguments* raw_array =
           reinterpret_cast<const RawTypeArguments*>(this);
       intptr_t array_length = Smi::Value(raw_array->ptr()->length_);
       instance_size = TypeArguments::InstanceSize(array_length);
       break;
     }
     case kPcDescriptorsCid: {
       const RawPcDescriptors* raw_descriptors =
           reinterpret_cast<const RawPcDescriptors*>(this);
-      const intptr_t num_descriptors = raw_descriptors->ptr()->length_;
-      const intptr_t rec_size_in_bytes =
-          raw_descriptors->ptr()->record_size_in_bytes_;
-      instance_size = PcDescriptors::InstanceSize(num_descriptors,
-                                                  rec_size_in_bytes);
+      intptr_t length = raw_descriptors->ptr()->length_;
+      instance_size = PcDescriptors::InstanceSize(length);
       break;
     }
     case kStackmapCid: {
       const RawStackmap* map = reinterpret_cast<const RawStackmap*>(this);
       intptr_t length = map->ptr()->length_;
       instance_size = Stackmap::InstanceSize(length);
       break;
     }
     case kLocalVarDescriptorsCid: {
       const RawLocalVarDescriptors* raw_descriptors =
@@ skipping 388 matching lines @@
     uword end_pc = start_pc + raw_instr->ptr()->size_;
     ASSERT(end_pc > start_pc);
     if ((pc >= start_pc) && (pc < end_pc)) {
       return true;
     }
   }
   return false;
 }
 
 
-intptr_t RawPcDescriptors::RecordSize(bool has_try_index) {
-  return has_try_index ? RawPcDescriptors::kFullRecSize
-                       : RawPcDescriptors::kCompressedRecSize;
-}
-
-
 intptr_t RawPcDescriptors::VisitPcDescriptorsPointers(
     RawPcDescriptors* raw_obj, ObjectPointerVisitor* visitor) {
-  return PcDescriptors::InstanceSize(raw_obj->ptr()->length_,
-                                     raw_obj->ptr()->record_size_in_bytes_);
+  return PcDescriptors::InstanceSize(raw_obj->ptr()->length_);
 }
 
 
 intptr_t RawStackmap::VisitStackmapPointers(RawStackmap* raw_obj,
                                             ObjectPointerVisitor* visitor) {
   return Stackmap::InstanceSize(raw_obj->ptr()->length_);
 }
 
 
 intptr_t RawLocalVarDescriptors::VisitLocalVarDescriptorsPointers(
@@ skipping 349 matching lines @@
 intptr_t RawUserTag::VisitUserTagPointers(
     RawUserTag* raw_obj, ObjectPointerVisitor* visitor) {
   // Make sure that we got here with the tagged pointer as this.
   ASSERT(raw_obj->IsHeapObject());
   visitor->VisitPointers(raw_obj->from(), raw_obj->to());
   return UserTag::InstanceSize();
 }
 
 
 }  // namespace dart