Keep track of stack base whenever Dart code is invoked.

runtime/vm/profiler.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 "platform/utils.h"
 
 #include "vm/allocation.h"
 #include "vm/atomic.h"
 #include "vm/code_patcher.h"
 #include "vm/isolate.h"
@@ skipping 1982 matching lines @@
 
   if (StubCode::InJumpToExceptionHandlerStub(state.pc)) {
     // The JumpToExceptionHandler stub manually adjusts the stack pointer,
     // frame pointer, and some isolate state before jumping to a catch entry.
     // It is not safe to walk the stack when executing this stub.
     return;
   }
 
   uword stack_lower = 0;
   uword stack_upper = 0;
-  isolate->GetStackBounds(&stack_lower, &stack_upper);
+  isolate->GetProfilerStackBounds(&stack_lower, &stack_upper);
   if ((stack_lower == 0) || (stack_upper == 0)) {
     // Could not get stack boundary.
     return;
   }
 
   if (state.sp > stack_lower) {
     // The stack pointer gives us a tighter lower bound.
     stack_lower = state.sp;
   }
 
@@ skipping 77 matching lines @@
                                             state.pc,
                                             state.fp,
                                             state.sp);
       stackWalker.walk();
 #endif
     }
   }
 }
 
 }  // namespace dart