First step in reducing the size of PC descriptors.

runtime/vm/flow_graph_compiler.cc

 // Copyright (c) 2013, 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/globals.h"  // Needed here to get TARGET_ARCH_XXX.
 
 #include "vm/flow_graph_compiler.h"
 
 #include "vm/cha.h"
 #include "vm/dart_entry.h"
@@ skipping 85 matching lines @@
       float32x4_class_(Class::ZoneHandle(
           isolate_->object_store()->float32x4_class())),
       float64x2_class_(Class::ZoneHandle(
           isolate_->object_store()->float64x2_class())),
       int32x4_class_(Class::ZoneHandle(
           isolate_->object_store()->int32x4_class())),
       list_class_(Class::ZoneHandle(
           Library::Handle(Library::CoreLibrary()).
               LookupClass(Symbols::List()))),
       parallel_move_resolver_(this),
-      pending_deoptimization_env_(NULL) {
+      pending_deoptimization_env_(NULL),
+      entry_patch_pc_offset_(Code::kInvalidPc),
+      patch_code_pc_offset_(Code::kInvalidPc),
+      lazy_deopt_pc_offset_(Code::kInvalidPc) {
   ASSERT(assembler != NULL);
   ASSERT(!list_class_.IsNull());
 }
 
 
 void FlowGraphCompiler::InitCompiler() {
   pc_descriptors_list_ = new DescriptorList(64);
   exception_handlers_list_ = new ExceptionHandlerList();
   block_info_.Clear();
   // Conservative detection of leaf routines used to remove the stack check
@@ skipping 576 matching lines @@
   code.set_exception_handlers(handlers);
 }
 
 
 void FlowGraphCompiler::FinalizePcDescriptors(const Code& code) {
   ASSERT(pc_descriptors_list_ != NULL);
   const PcDescriptors& descriptors = PcDescriptors::Handle(
       pc_descriptors_list_->FinalizePcDescriptors(code.EntryPoint()));
   if (!is_optimizing_) descriptors.Verify(parsed_function_.function());
   code.set_pc_descriptors(descriptors);
+  code.set_entry_patch_pc_offset(entry_patch_pc_offset_);
+  code.set_patch_code_pc_offset(patch_code_pc_offset_);
+  code.set_lazy_deopt_pc_offset(lazy_deopt_pc_offset_);
 }
 
 
 void FlowGraphCompiler::FinalizeDeoptInfo(const Code& code) {
   // For functions with optional arguments, all incoming arguments are copied
   // to spill slots. The deoptimization environment does not track them.
   const Function& function = parsed_function().function();
   const intptr_t incoming_arg_count =
       function.HasOptionalParameters() ? 0 : function.num_fixed_parameters();
   DeoptInfoBuilder builder(isolate(), incoming_arg_count);
@@ skipping 584 matching lines @@
 
   for (int i = 0; i < len; i++) {
     sorted->Add(CidTarget(ic_data.GetReceiverClassIdAt(i),
                           &Function::ZoneHandle(ic_data.GetTargetAt(i)),
                           ic_data.GetCountAt(i)));
   }
   sorted->Sort(HighestCountFirst);
 }
 
 }  // namespace dart