VM: New calling convention for generated code.

runtime/vm/stack_frame.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/stack_frame.h"
 
 #include "platform/memory_sanitizer.h"
 #include "vm/assembler.h"
 #include "vm/deopt_instructions.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/os.h"
 #include "vm/parser.h"
 #include "vm/raw_object.h"
 #include "vm/reusable_handles.h"
 #include "vm/stub_code.h"
 #include "vm/visitor.h"
 
 namespace dart {
 
 
 bool StackFrame::IsStubFrame() const {
   ASSERT(!(IsEntryFrame() || IsExitFrame()));
-  uword saved_pc =
-      *(reinterpret_cast<uword*>(fp() + (kPcMarkerSlotFromFp * kWordSize)));
-  return (saved_pc == 0);
+  return (LookupDartCode() == Code::null());
 }
 
 
 const char* StackFrame::ToCString() const {
   ASSERT(isolate_ == Isolate::Current());
   Zone* zone = Thread::Current()->zone();
   if (IsDartFrame()) {
     const Code& code = Code::Handle(LookupDartCode());
     ASSERT(!code.IsNull());
     const Object& owner = Object::Handle(code.owner());
@@ skipping 130 matching lines @@
 }
 
 
 RawCode* StackFrame::LookupDartCode() const {
   ASSERT(isolate_ == Isolate::Current());
   // We add a no gc scope to ensure that the code below does not trigger
   // a GC as we are handling raw object references here. It is possible
   // that the code is called while a GC is in progress, that is ok.
   NoSafepointScope no_safepoint;
   RawCode* code = GetCodeObject();
-  ASSERT(code == Code::null() || code->ptr()->owner_ != Function::null());
-  return code;
+  if ((code != Code::null()) &&
+      (code->ptr()->owner_->GetClassId() == kFunctionCid)) {
+    return code;
+  }
+  return Code::null();
 }
 
 
 RawCode* StackFrame::GetCodeObject() const {
   // We add a no gc scope to ensure that the code below does not trigger
   // a GC as we are handling raw object references here. It is possible
   // that the code is called while a GC is in progress, that is ok.
   NoSafepointScope no_safepoint;
   const uword pc_marker =
       *(reinterpret_cast<uword*>(fp() + (kPcMarkerSlotFromFp * kWordSize)));
   if (pc_marker != 0) {
-    const uword entry_point =
-        (pc_marker - Assembler::EntryPointToPcMarkerOffset());
-    RawInstructions* instr = Instructions::FromEntryPoint(entry_point);
-    if (instr != Instructions::null()) {
-      return instr->ptr()->code_;
-    }
+    ASSERT(reinterpret_cast<RawObject*>(pc_marker)->GetClassId() == kCodeCid);
+    return reinterpret_cast<RawCode*>(pc_marker);
   }
   return Code::null();
 }
 
 
 bool StackFrame::FindExceptionHandler(Isolate* isolate,
                                       uword* handler_pc,
                                       bool* needs_stacktrace,
                                       bool* has_catch_all) const {
   REUSABLE_CODE_HANDLESCOPE(isolate);
@@ skipping 285 matching lines @@
     if (deopt_instr->kind() == DeoptInstr::kCallerFp) {
       return (index - num_materializations_);
     }
   }
   UNREACHABLE();
   return 0;
 }
 
 
 }  // namespace dart