Changes to support dprof and Observatory profiler UIs

runtime/vm/native_symbol_win.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/globals.h"
 #if defined(TARGET_OS_WINDOWS)
 
 #include "vm/native_symbol.h"
 #include "vm/thread.h"
 
@@ skipping 29 matching lines @@
 #if 0
   HANDLE hProcess = GetCurrentProcess();
   if (!SymCleanup(hProcess)) {
     DWORD error = GetLastError();
     printf("Failed to shutdown NativeSymbolResolver (SymCleanup  %d)\n", error);
   }
 #endif
 }
 
 
-char* NativeSymbolResolver::LookupSymbolName(uintptr_t pc) {
+char* NativeSymbolResolver::LookupSymbolName(uintptr_t pc, uintptr_t* start) {
   static const intptr_t kMaxNameLength = 2048;
   static const intptr_t kSymbolInfoSize = sizeof(SYMBOL_INFO);  // NOLINT.
   static char buffer[kSymbolInfoSize + kMaxNameLength];
   static char name_buffer[kMaxNameLength];
   MutexLocker lock(lock_);
   if (!running_) {
     return NULL;
   }
+  if (start != NULL) {
+    *start = NULL;
+  }
 #if 0
   memset(&buffer[0], 0, sizeof(buffer));
   HANDLE hProcess = GetCurrentProcess();
   DWORD64 address = static_cast<DWORD64>(pc);
   PSYMBOL_INFO pSymbol = reinterpret_cast<PSYMBOL_INFO>(&buffer[0]);
   pSymbol->SizeOfStruct = kSymbolInfoSize;
   pSymbol->MaxNameLen = kMaxNameLength;
   BOOL r = SymFromAddr(hProcess, address, NULL, pSymbol);
   if (r == FALSE) {
     return NULL;
   }
   return strdup(pSymbol->Name);
 #endif
   return NULL;
 }
 
 
 void NativeSymbolResolver::FreeSymbolName(char* name) {
   free(name);
 }
 
 
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_WINDOWS)