Patents by Inventor Sreeranga P. Rajan

Sreeranga P. Rajan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 9501331
    Abstract: A satisfiability checking system may include a single instruction, multiple data (SIMD) machine configured to execute multiple threads in parallel. The multiple threads may be divided among multiple blocks. The SIMD machine may be further configured to perform satisfiability checking of a formula including multiple parts. The satisfiability checking may include assigning one or more of the parts to one or more threads of the multiple threads of a first block of the multiple blocks. The satisfiability checking may further include processing the assigned one or more parts in the first block such that first results are calculated based on a first proposition. The satisfiability checking may further include synchronizing the results among the one or more threads of the first block.
    Type: Grant
    Filed: August 9, 2012
    Date of Patent: November 22, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Guodong Li, Indradeep Ghosh, Sreeranga P. Rajan
  • Patent number: 9477928
    Abstract: In one embodiment, a method may include symbolically executing application code on a first framework. The method may also include creating a first model based on the symbolic execution of the first framework. The method may additionally include symbolically executing the application code on a second framework. The method may further include creating a second model based on the symbolic execution of the first framework. The method may also include determining one or more parameters associated with the first framework based on the first model. The method may additionally include determining one or more parameters associated with the second framework based on the second model. The method may also include selecting one of the first framework and the second framework as a desired framework for execution of the application code based on a comparison of the one or more parameters associated with the first framework and the one or more parameters associated with the second framework.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: October 25, 2016
    Assignee: Fujitsu Limited
    Inventors: Sreeranga P. Rajan, Indradeep Ghosh
  • Patent number: 9104809
    Abstract: In one embodiment, a method includes accessing one or more document object model (DOM) representations of one or more pages of a Web application that comprises one or more instances of a web-application artifact. For each of one or more of the instances, the method also includes identifying a first set of one or more DOM elements in one of the DOM representations of one of the pages that collectively correspond to the instance. The method additionally includes identifying a second set of one or more particular values of one or more particular attributes of one or more particular ones of the DOM elements in the first sets. The second set may then be mapped to the web-application artifact to provide a DOM definition of the web-application artifact.
    Type: Grant
    Filed: March 24, 2010
    Date of Patent: August 11, 2015
    Assignee: Fujitsu Limited
    Inventors: Mukul R. Prasad, Sreeranga P. Rajan
  • Patent number: 9038032
    Abstract: A method includes, by one or more computing devices, determining JavaScript statements to be evaluated, parsing the JavaScript statements, translating the JavaScript statements into Java bytecodes and JavaScript-specific instructions, executing the Java bytecodes in a Java execution engine, calling a JavaScript run-time engine from the Java execution engine, handling one or more semantic operations associated with the JavaScript-specific instructions through use of the JavaScript run-time engine, and providing return values to the Java execution engine. The statements are configured for execution on a computing device. The set of Java bytecodes and JavaScript-specific instructions is configured to conduct symbolic execution of one or more portions of the JavaScript statements. The symbolic execution is configured to evaluate the JavaScript statements.
    Type: Grant
    Filed: May 25, 2012
    Date of Patent: May 19, 2015
    Assignee: Fujitsu Limited
    Inventors: Guodong Li, Praveen K. Murthy, Indradeep Ghosh, Sreeranga P. Rajan
  • Patent number: 8943487
    Abstract: Particular embodiments optimize a C++ function comprising one or more loops for symbolic execution, comprising for each loop, if there is a branching condition within the loop, then rewrite the loop to move the branching condition outside the loop. Particular embodiments may further optimize the C++ function through simplified symbolic expressions and adding constructs forcing delayed interpretation of symbolic expressions during the symbolic execution.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: January 27, 2015
    Assignee: Fujitsu Limited
    Inventors: Guodong Li, Sreeranga P. Rajan, Indradeep Ghosh
  • Patent number: 8869113
    Abstract: Particular embodiment compile a C++ program having one or more input variables to obtain bytecode of the C++ program; compile a C++ library to obtain bytecode of the C++ library; symbolically execute the bytecode of the C++ program and the bytecode of the C++ library, comprising assign a symbolic input to each input variable of the C++ program; determine one or more execution paths in the C++ program; and for each execution path, construct a symbolic expression that if satisfied, causes the C++ program to proceed down the execution path; and generate one or more test cases for the C++ program by solving the symbolic expressions.
    Type: Grant
    Filed: January 20, 2011
    Date of Patent: October 21, 2014
    Assignee: Fujitsu Limited
    Inventors: Guodong Li, Sreeranga P. Rajan, Indradeep Ghosh
  • Patent number: 8683316
    Abstract: A method and apparatus is provided for populating and submitting electronic forms by proxy over a data-packet-network. The apparatus comprises software running on a system of network-connected servers that enables a user, connected to one of the servers, to navigate to a site containing an electronic form and obtain data about the site and the form. The data obtained is used in conjunction with data about the user to construct a machine readable job order upon user request that may be executed for the purpose of automatic form population and submission to a host sponsoring the site. Upon acceptance of the submitted form, data used for log-in is stored where it is entered along with site data as a new registered site item for a user such that future navigation to the site, auto log-in and data return is performed automatically on behalf of the user.
    Type: Grant
    Filed: August 6, 2010
    Date of Patent: March 25, 2014
    Assignee: Yodlee.com
    Inventors: Anand Rangarajan, Ji Hoon Lee, Suman Kumar Inala, Ramakrishna Satyavolu, Sreeranga P. Rajan
  • Patent number: 8656370
    Abstract: In one embodiment, accessing a control flow graph (CFG) of a software program written in JavaScript; identifying one or more paths in the CFG; and performing symbolic execution on the software program using the CFG.
    Type: Grant
    Filed: August 26, 2011
    Date of Patent: February 18, 2014
    Assignee: Fujitsu Limited
    Inventors: Praveen K. Murthy, Sreeranga P. Rajan
  • Publication number: 20140047217
    Abstract: A satisfiability checking system may include a single instruction, multiple data (SIMD) machine configured to execute multiple threads in parallel. The multiple threads may be divided among multiple blocks. The SIMD machine may be further configured to perform satisfiability checking of a formula including multiple parts. The satisfiability checking may include assigning one or more of the parts to one or more threads of the multiple threads of a first block of the multiple blocks. The satisfiability checking may further include processing the assigned one or more parts in the first block such that first results are calculated based on a first proposition. The satisfiability checking may further include synchronizing the results among the one or more threads of the first block.
    Type: Application
    Filed: August 9, 2012
    Publication date: February 13, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Guodong LI, Indradeep GHOSH, Sreeranga P. RAJAN
  • Patent number: 8645924
    Abstract: In one embodiment, symbolically executing a software module having a number of execution paths; and losslessly reducing the number of execution paths during the symbolic execution of the software module.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: February 4, 2014
    Assignee: Fujitsu Limited
    Inventors: Guodong Li, Sreeranga P. Rajan, Indradeep Ghosh
  • Patent number: 8595701
    Abstract: In particular embodiments, a method includes accessing bytecode generated by a compiler from a software program for execution by a particular processing unit; accessing configuration information describing one or more aspects of the particular processing unit; symbolically executing the bytecode with the configuration information; and, based on the symbolic execution, generating one or more results conveying a functional correctness of the software program with respect to the particular processing unit for communication to a user and generating one or more test cases for the software program for communication to a user.
    Type: Grant
    Filed: February 4, 2011
    Date of Patent: November 26, 2013
    Assignee: Fujitsu Limited
    Inventors: Guodong Li, Sreeranga P. Rajan, Indradeep Ghosh
  • Patent number: 8543986
    Abstract: A method includes accessing a page of Web application that includes an interactive form having at least one field for entry of data, the interactive form rendered by the Web application based on code for the interactive form. The method also includes extracting input validation code from the code, the input validation code including at least one constraint on data entered into the at least one field. The method additionally includes extracting the at least one constraint based on an analysis of the input validation code and solving, for the at least one field, for a string value based at least on the at least one constraint for the at least one field. The also includes automatically entering, into the at least one field, the string value. The method additionally includes automatically submitting the interactive form, including the string value entered into the at least one field.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: September 24, 2013
    Assignee: Fujitsu Limited
    Inventors: Praveen K. Murthy, Fangqi Sun, Mukul Ranjan Prasad, Sreeranga P. Rajan
  • Patent number: 8504997
    Abstract: In particular embodiments, an environment for modular software analysis is generated for a software module under analysis. Irrelevancy analysis is performed on the software module to determine that, for each input datum to the software module, whether the input datum is relevant or irrelevant with respect to branch coverage of the module code. A default concrete value is assigned to each irrelevant input datum. A set of concrete values is calculated for each relevant input datum using symbolic execution. The environment is enhanced such that default concrete values are passed to the software module for the irrelevant input data and sets of concrete values generated using symbolic execution are passed to the software module for the relevant input data. The enhanced environment enables module analysis with as much as 100% branch coverage of the module code.
    Type: Grant
    Filed: March 19, 2009
    Date of Patent: August 6, 2013
    Assignee: Fujitsu Limited
    Inventors: Oksana Tkachuk, Indradeep Ghosh, Sreeranga P. Rajan
  • Patent number: 8479170
    Abstract: In one embodiment, analyze client-tier source code of a client-server software application to extract one or more software modules that handle user-input data of the software application. For each one of the software modules, extract from the software module one or more user-input constraints placed on the user-input data, comprising: analyze source code of the software module to determine one or more failure points in the source code; perform symbolic execution on the software module to extract one or more first expressions that cause the software module to reach the failure points, respectively; obtain a second expression as the disjunction of all the first expressions; obtain a third expression as the negation of the second expression; and extract the user-input constraints from the third expression. Determine one or more user-input data that satisfy all the user-input constraints.
    Type: Grant
    Filed: May 12, 2010
    Date of Patent: July 2, 2013
    Assignee: Fujitsu Limited
    Inventors: Mukul R. Prasad, Sreeranga P. Rajan
  • Patent number: 8468537
    Abstract: In one embodiment, a method includes statically analyzing a validation toolkit environment. The method may also include, identifying a plurality of computational threads that do not share data structures with each other based on analysis of the validation toolkit environment. The method may additionally include calculating computational requirements of the computational threads. The method may further include distributing the threads among a plurality of resources such that the aggregate computational requirements of the computational threads are approximately evenly balanced among the plurality of resources.
    Type: Grant
    Filed: July 14, 2010
    Date of Patent: June 18, 2013
    Assignee: Fujitsu Limited
    Inventors: Sreeranga P. Rajan, Praveen K. Murthy, Indradeep Ghosh, Mukul Ranjan Prasad, Oksana I. Tkachuk
  • Patent number: 8453117
    Abstract: In one embodiment, a method includes accessing an event-driven application input by a user, the event-driven application comprising source code, one or more use cases input by the user for the event-driven application, and one or more functional requirements input by the user for the event-driven application; parsing the use cases and the functional requirements according to the predefined syntax to construct one or more validation modules for validating the event-driven application without any modification to the source code of the event-driven application for validation purposes; formally validating the event-driven application using the validation modules without relying on assertions inserted into the source code of the event-driven application for validation purposes; and if the formal validation finds one or more defects in the event-driven application, generating output for communication to the user identifying the defects.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: May 28, 2013
    Assignee: Fujitsu Limited
    Inventors: Sreeranga P. Rajan, Mukul Prasad, Oksana Tkachuk, Indradeep Ghosh
  • Patent number: 8402319
    Abstract: In one embodiment, a method includes automated extraction of the Page Transition Graph (PTG) model for model-based analysis of web applications.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: March 19, 2013
    Assignee: Fujitsu Limited
    Inventors: Oksana Tkachuk, Sreeranga P. Rajan
  • Publication number: 20130055210
    Abstract: In one embodiment, accessing a control flow graph (CFG) of a software program written in JavaScript; identifying one or more paths in the CFG; and performing symbolic execution on the software program using the CFG.
    Type: Application
    Filed: August 26, 2011
    Publication date: February 28, 2013
    Applicant: FUJITSU LIMITED
    Inventors: Praveen K. Murthy, Sreeranga P. Rajan
  • Publication number: 20130055221
    Abstract: In one embodiment, accessing a control flow graph (CFG) of a software program written in JavaScript; accessing a set of specification requirements of the software program; and determining if there is any portion of the CFG that violates any specification requirement of the software program.
    Type: Application
    Filed: August 26, 2011
    Publication date: February 28, 2013
    Applicant: FUJITSU LIMITED
    Inventors: Praveen K. Murthy, Sreeranga P. Rajan
  • Patent number: 8359576
    Abstract: In one embodiment, a method include accessing one or more global temporal requirements of an application specified using one or more requirement templates from a library of requirement templates, accessing a model of the application, generating one or more symbolic expressions of one or more of the global temporal requirements of the application, searching a state space of the application model with a model checker, monitoring the search of the state space for events in the state space encompassed by the symbolic expressions and modifying construction of a graph of the state space in response to occurrence of one or more events encompassed by the symbolic expressions, evaluating the symbolic expressions based on the graph of the state space to determine whether one or more of the global temporal requirements are valid, and communicating one or more results of the evaluation of the symbolic expressions for presentation to a user.
    Type: Grant
    Filed: November 14, 2008
    Date of Patent: January 22, 2013
    Assignee: Fujitsu Limited
    Inventors: Mukul R. Prasad, Indradeep Ghosh, Sreeranga P. Rajan