[oilpan]: Add SafePointAwareMutexLocker to allow GC when waiting for lock.

Source/modules/webdatabase/sqlite/SQLiteStatement.cpp

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 41 matching lines @@
 
 SQLiteStatement::~SQLiteStatement()
 {
     finalize();
 }
 
 int SQLiteStatement::prepare()
 {
     ASSERT(!m_isPrepared);
 
+    CString query = m_query.stripWhiteSpace().utf8();
+
+    ThreadState::SafePointScope scope(ThreadState::HeapPointersOnStack);
     MutexLocker databaseLock(m_database.databaseMutex());
     if (m_database.isInterrupted())
         return SQLITE_INTERRUPT;
 
-    CString query = m_query.stripWhiteSpace().utf8();
-
     WTF_LOG(SQLDatabase, "SQL - prepare - %s", query.data());
 
     // Pass the length of the string including the null character to sqlite3_prepare_v2;
     // this lets SQLite avoid an extra string copy.
     size_t lengthIncludingNullCharacter = query.length() + 1;
 
     const char* tail = 0;
     int error = sqlite3_prepare_v2(m_database.sqlite3Handle(), query.data(), lengthIncludingNullCharacter, &m_statement, &tail);
 
     if (error != SQLITE_OK)
         WTF_LOG(SQLDatabase, "sqlite3_prepare16 failed (%i)\n%s\n%s", error, query.data(), sqlite3_errmsg(m_database.sqlite3Handle()));
     else if (tail && *tail)
         error = SQLITE_ERROR;
 
 #ifndef NDEBUG
     m_isPrepared = error == SQLITE_OK;
 #endif
     return error;
 }
 
 int SQLiteStatement::step()
 {
+    ThreadState::SafePointScope scope(ThreadState::HeapPointersOnStack);
     MutexLocker databaseLock(m_database.databaseMutex());
     if (m_database.isInterrupted())
         return SQLITE_INTERRUPT;
     //ASSERT(m_isPrepared);
 
     if (!m_statement)
         return SQLITE_OK;
 
     // The database needs to update its last changes count before each statement
     // in order to compute properly the lastChanges() return value.
@@ skipping 165 matching lines @@
     ASSERT(col >= 0);
     if (!m_statement)
         if (prepareAndStep() != SQLITE_ROW)
             return 0;
     if (columnCount() <= col)
         return 0;
     return sqlite3_column_int64(m_statement, col);
 }
 
 } // namespace WebCore