Get C++ stack pointer in an ASAN-compatible fashion when jumping to exception handler.

runtime/vm/exceptions.cc

 // Copyright (c) 2011, 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/exceptions.h"
 
 #include "platform/address_sanitizer.h"
 
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 213 matching lines @@
 
   // Call a stub to set up the exception object in kExceptionObjectReg,
   // to set up the stacktrace object in kStackTraceObjectReg, and to
   // continue execution at the given pc in the given frame.
   typedef void (*ExcpHandler)(uword, uword, uword, RawObject*, RawObject*,
                               Isolate*);
   ExcpHandler func = reinterpret_cast<ExcpHandler>(
       StubCode::JumpToExceptionHandlerEntryPoint());
 
   // Unpoison the stack before we tear it down in the generated stub code.
-  uword current_sp = reinterpret_cast<uword>(&program_counter) - 1024;
+  uword current_sp = Isolate::GetCurrentStackPointer() - 1024;
   ASAN_UNPOISON(reinterpret_cast<void*>(current_sp),
                 stack_pointer - current_sp);
 
   func(program_counter, stack_pointer, frame_pointer,
        raw_exception, raw_stacktrace, isolate);
 #endif
   UNREACHABLE();
 }
 
 
@@ skipping 419 matching lines @@
 
 // Throw JavascriptCompatibilityError exception.
 void Exceptions::ThrowJavascriptCompatibilityError(const char* msg) {
   const Array& exc_args = Array::Handle(Array::New(1));
   const String& msg_str = String::Handle(String::New(msg));
   exc_args.SetAt(0, msg_str);
   Exceptions::ThrowByType(Exceptions::kJavascriptCompatibilityError, exc_args);
 }
 
 }  // namespace dart