Switch profiler from isolates to threads [second landing]

runtime/vm/stub_code.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/stub_code.h"
 
 #include "platform/assert.h"
 #include "platform/globals.h"
 #include "vm/assembler.h"
 #include "vm/disassembler.h"
@@ skipping 61 matching lines @@
 }
 
 
 void StubCode::Init(Isolate* isolate) { }
 
 
 void StubCode::VisitObjectPointers(ObjectPointerVisitor* visitor) {
 }
 
 
+bool StubCode::HasBeenInitialized() {
+  // Use JumpToExceptionHandler and InvokeDart as canaries.
+  const StubEntry* entry_1 = StubCode::JumpToExceptionHandler_entry();
+  const StubEntry* entry_2 = StubCode::InvokeDartCode_entry();
+  return (entry_1 != NULL) && (entry_2 != NULL);
+}
+
+
 bool StubCode::InInvocationStub(uword pc) {
+  ASSERT(HasBeenInitialized());
   uword entry = StubCode::InvokeDartCode_entry()->EntryPoint();
   uword size = StubCode::InvokeDartCodeSize();
   return (pc >= entry) && (pc < (entry + size));
 }
 
 
 bool StubCode::InJumpToExceptionHandlerStub(uword pc) {
+  ASSERT(HasBeenInitialized());
   uword entry = StubCode::JumpToExceptionHandler_entry()->EntryPoint();
   uword size = StubCode::JumpToExceptionHandlerSize();
   return (pc >= entry) && (pc < (entry + size));
 }
 
 
 RawCode* StubCode::GetAllocationStubForClass(const Class& cls) {
   Thread* thread = Thread::Current();
   Zone* zone = thread->zone();
   const Error& error = Error::Handle(zone, cls.EnsureIsFinalized(thread));
@@ skipping 62 matching lines @@
   if ((name##_entry() != NULL) &&                                              \
       (entry_point == name##_entry()->EntryPoint())) {                         \
     return ""#name;                                                            \
   }
   VM_STUB_CODE_LIST(VM_STUB_CODE_TESTER);
 #undef VM_STUB_CODE_TESTER
   return NULL;
 }
 
 }  // namespace dart