VM: New calling convention for generated code.

runtime/vm/deopt_instructions.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/deopt_instructions.h"
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/intermediate_language.h"
 #include "vm/locations.h"
 #include "vm/parser.h"
 #include "vm/stack_frame.h"
 #include "vm/thread.h"
 #include "vm/timeline.h"
 
 namespace dart {
 
 DEFINE_FLAG(bool, compress_deopt_info, true,
             "Compress the size of the deoptimization info for optimized code.");
 DECLARE_FLAG(bool, trace_deoptimization);
 DECLARE_FLAG(bool, trace_deoptimization_verbose);
 
 
 DeoptContext::DeoptContext(const StackFrame* frame,
                            const Code& code,
                            DestFrameOptions dest_options,
                            fpu_register_t* fpu_registers,
-                           intptr_t* cpu_registers)
+                           intptr_t* cpu_registers,
+                           bool is_lazy_deopt)
     : code_(code.raw()),
       object_pool_(code.GetObjectPool()),
       deopt_info_(TypedData::null()),
       dest_frame_is_allocated_(false),
       dest_frame_(NULL),
       dest_frame_size_(0),
       source_frame_is_allocated_(false),
       source_frame_(NULL),
       source_frame_size_(0),
       cpu_registers_(cpu_registers),
       fpu_registers_(fpu_registers),
       num_args_(0),
       deopt_reason_(ICData::kDeoptUnknown),
       deopt_flags_(0),
       thread_(Thread::Current()),
       timeline_event_(NULL),
       deferred_slots_(NULL),
       deferred_objects_count_(0),
-      deferred_objects_(NULL) {
+      deferred_objects_(NULL),
+      is_lazy_deopt_(is_lazy_deopt) {
   const TypedData& deopt_info = TypedData::Handle(
       code.GetDeoptInfoAtPc(frame->pc(), &deopt_reason_, &deopt_flags_));
   ASSERT(!deopt_info.IsNull());
   deopt_info_ = deopt_info.raw();
 
   const Function& function = Function::Handle(code.function());
 
   // Do not include incoming arguments if there are optional arguments
   // (they are copied into local space at method entry).
   num_args_ =
@@ skipping 585 matching lines @@
 
   virtual intptr_t source_index() const { return object_table_index_; }
   virtual DeoptInstr::Kind kind() const { return kPcMarker; }
 
   virtual const char* ArgumentsToCString() const {
     return Thread::Current()->zone()->PrintToString(
         "%" Pd "", object_table_index_);
   }
 
   void Execute(DeoptContext* deopt_context, intptr_t* dest_addr) {
-    *dest_addr = Smi::RawValue(0);
+    Function& function = Function::Handle(deopt_context->zone());
+    function ^= deopt_context->ObjectAt(object_table_index_);
+    if (function.IsNull()) {
+      *reinterpret_cast<RawObject**>(dest_addr) = deopt_context->is_lazy_deopt()
+          ? StubCode::DeoptimizeLazy_entry()->code()
+          : StubCode::Deoptimize_entry()->code();
+      return;
+    }
+
+    *dest_addr = reinterpret_cast<intptr_t>(Object::null());
     deopt_context->DeferPcMarkerMaterialization(
         object_table_index_, dest_addr);
   }
 
  private:
   intptr_t object_table_index_;
 
   DISALLOW_COPY_AND_ASSIGN(DeoptPcMarkerInstr);
 };
 
@@ skipping 629 matching lines @@
                           Smi* offset,
                           TypedData* info,
                           Smi* reason) {
   intptr_t i = index * kEntrySize;
   *offset ^= table.At(i);
   *info ^= table.At(i + 1);
   *reason ^= table.At(i + 2);
 }
 
 }  // namespace dart