|
Dynamic Code Analysis
Dynamic program analysis is the analysis of computer software that is performed by executing programs on a real or virtual processor. For dynamic program analysis to be effective, the target program must be executed with sufficient test inputs to cover almost all possible outputs. Use of software testing measures such as code coverage helps increase the chance that an adequate slice of the program's set of possible behaviors has been observed. Also, care must be taken to minimize the effect that instrumentation has on the execution (including temporal properties) of the target program. Dynamic analysis is in contrast to static program analysis. Unit tests, integration tests, system tests and acceptance tests use dynamic testing. Types of dynamic analysis Code coverage Computing the code coverage according to a test suite or a workload is a standard dynamic analysis technique. * Gcov is the GNU source code coverage program. * VB Watch injects dynamic analysis code i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Program Analysis (computer Science)
In computer science, program analysis is the process of automatically analyzing the behavior of computer programs regarding a property such as correctness, robustness, safety and liveness. Program analysis focuses on two major areas: program optimization and program correctness. The first focuses on improving the program’s performance while reducing the resource usage while the latter focuses on ensuring that the program does what it is supposed to do. Program analysis can be performed without executing the program (static program analysis), during runtime (dynamic program analysis) or in a combination of both. Static program analysis In the context of program correctness, static analysis can discover vulnerabilities during the development phase of the program.Jovanovic, N., Kruegel, C., & Kirda, E. (2006, May). Pixy: A static analysis tool for detecting web application vulnerabilities. In Security and Privacy, 2006 IEEE Symposium on (pp. 6-pp). IEEE. These vulnerabilities a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
AddressSanitizer
AddressSanitizer (or ASan) is an open source programming tool that detects memory corruption bugs such as buffer overflows or accesses to a dangling pointer (use-after-free). AddressSanitizer is based on compiler instrumentation and directly mapped shadow memory. AddressSanitizer is currently implemented in Clang (starting from version 3.1), GCC (starting from version 4.8), Xcode (starting from version 7.0) and MSVC (widely available starting from version 16.9). On average, the instrumentation increases processing time by about 73% and memory usage by 240%. Users Chromium and Firefox developers are active users of AddressSanitizer; the tool has found hundreds of bugs in these web browsers. A number of bugs were found in FFmpeg and FreeType. The Linux kernel has enabled the AddressSanitizer for the x86-64 x86-64 (also known as x64, x86_64, AMD64, and Intel 64) is a 64-bit version of the x86 instruction set, first released in 1999. It introduced two new modes of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Multithreading (software)
In computer science, a thread of execution is the smallest sequence of programmed instructions that can be managed independently by a scheduler, which is typically a part of the operating system. The implementation of threads and processes differs between operating systems. In Modern Operating Systems, Tanenbaum shows that many distinct models of process organization are possible.TANENBAUM, Andrew S. Modern Operating Systems. 1992. Prentice-Hall International Editions, ISBN 0-13-595752-4. In many cases, a thread is a component of a process. The multiple threads of a given process may be executed concurrently (via multithreading capabilities), sharing resources such as memory, while different processes do not share these resources. In particular, the threads of a process share its executable code and the values of its dynamically allocated variables and non- thread-local global variables at any given time. History Threads made an early appearance under the name of "task ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Race Conditions
A race condition or race hazard is the condition of an electronics, software, or other system where the system's substantive behavior is dependent on the sequence or timing of other uncontrollable events. It becomes a bug when one or more of the possible behaviors is undesirable. The term ''race condition'' was already in use by 1954, for example in David A. Huffman's doctoral thesis "The synthesis of sequential switching circuits". Race conditions can occur especially in logic circuits, multithreaded, or distributed software programs. In electronics A typical example of a race condition may occur when a logic gate combines signals that have traveled along different paths from the same source. The inputs to the gate can change at slightly different times in response to a change in the source signal. The output may, for a brief period, change to an unwanted state before settling back to the designed state. Certain systems can tolerate such glitches but if this output funct ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Free (programming)
C dynamic memory allocation refers to performing manual memory management for dynamic memory allocation in the C programming language via a group of functions in the C standard library, namely , , , and . The C++ programming language includes these functions; however, the operators and provide similar functionality and are recommended by that language's authors. Still, there are several situations in which using new/delete is not applicable, such as garbage collection code or performance-sensitive code, and a combination of malloc and placement new may be required instead of the higher-level new operator. Many different implementations of the actual memory allocation mechanism, used by , are available. Their performance varies in both execution time and required memory. Rationale The C programming language manages memory statically, automatically, or dynamically. Static-duration variables are allocated in main memory, usually along with the executable code of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Malloc
C dynamic memory allocation refers to performing manual memory management for dynamic memory allocation in the C programming language via a group of functions in the C standard library, namely , , , and . The C++ programming language includes these functions; however, the operators and provide similar functionality and are recommended by that language's authors. Still, there are several situations in which using new/delete is not applicable, such as garbage collection code or performance-sensitive code, and a combination of malloc and placement new may be required instead of the higher-level new operator. Many different implementations of the actual memory allocation mechanism, used by , are available. Their performance varies in both execution time and required memory. Rationale The C programming language manages memory statically, automatically, or dynamically. Static-duration variables are allocated in main memory, usually along with the executable code of the pro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Valgrind
Valgrind () is a programming tool for memory debugging, memory leak detection, and profiling. Valgrind was originally designed to be a free memory debugging tool for Linux on x86, but has since evolved to become a generic framework for creating dynamic analysis tools such as checkers and profilers. Overview Valgrind is in essence a virtual machine using just-in-time compilation techniques, including dynamic recompilation. Nothing from the original program ever gets run directly on the host processor. Instead, Valgrind first translates the program into a temporary, simpler form called intermediate representation (IR), which is a processor-neutral, static single assignment form-based form. After the conversion, a tool (see below) is free to do whatever transformations it would like on the IR, before Valgrind translates the IR back into machine code and lets the host processor run it. Valgrind recompiles binary code to run on host and target (or simulated) CPUs of the same a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Storage Violation
In computing a storage violation is a hardware or software fault that occurs when a task attempts to access an area of computer storage which it is not permitted to access. Types of storage violation Storage violation can, for instance, consist of reading from, writing to, or freeing storage not owned by the task. A common type of storage violation is known as a stack buffer overflow where a program attempts to exceed the limits set for its call stack. It can also refer to attempted modification of memory "owned" by another thread where there is incomplete (or no) memory protection. Avoidance of storage violations Storage violations can occur in transaction systems such as CICS in circumstances where it is possible to write to storage not owned by the transaction; such violations can be reduced by enabling features such as storage protection and transaction isolation. Detection of storage violations Storage violations can be difficult to detect as a program can often run fo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
IBM Rational Purify
PurifyPlus is a memory debugger program used by software developers to detect memory access errors in programs, especially those written in C or C++. It was originally written by Reed Hastings of Pure Software. by Reed Hastings and Bob Joyce, Usenix Winter 1992 technical conference. Pure Software later merged with Atria Software to form Pure Atria Software, which in turn was later acquired by , which in turn was acquired by IBM, and then divested to [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dmalloc
Dmalloc is a C memory debugger library written by Gray Watson to assist programmers in finding a variety of dynamic memory allocation mistakes. It replaces parts (such as malloc) of the C standard library provided by the operating system or compiler with its own versions, which produce information intended to help the programmer detect problematic code. Dmalloc can find memory leaks, off-by-one error An off-by-one error or off-by-one bug (known by acronyms OBOE, OBO, OB1 and OBOB) is a logic error involving the discrete equivalent of a boundary condition. It often occurs in computer programming when an iterative loop iterates one time too m ...s, and usage of invalid addresses in some library functions calls. See also * Memory debugger External links Dmalloc Official web siteDmalloc Github web siteMemory Leak Detection in Embedded Systems Memory management software Free memory debuggers {{unix-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DevPartner
DevPartner is a set of software development and testing tools developed by NuMega, acquired by Compuware in 1997, which on June 1, 2009 sold it to Micro Focus. There are two versions: one for native and .NET Windows applications, and another for Java applications. It is currently sold by Micro Focus. ''DevPartner Studio (DPS)'' is a suite of tools allowing a developer to analyze native (unmanaged) and .NET (managed) code for: * Code quality and complexity * Memory leak detection * Memory optimization * Performance analysis (timing) * Performance expert (CPU, disk and network resource usage) * Code coverage analysis * Fault simulation (both .NET and environmental) * Error detection and interop monitoring for C/C++ using BoundsChecker technology. Each analysis can be configured to show detail at the method or line level. DevPartner Studio integrates with all versions of Microsoft Visual Studio from 2005 through 2019, providing toolbar buttons and menu options to access all of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Micro Focus
Micro Focus International plc is a British multinational software and information technology business based in Newbury, Berkshire, England. The firm provides software and consultancy. The company is listed on the London Stock Exchange and is a constituent of the FTSE 250 Index. History Micro Focus was founded in 1976. In 1981, it became the first company to win the Queen's Award for Industry purely for developing a software product. The product was CIS COBOL, a standard-compliant COBOL implementation for microcomputers. In 1998, the company acquired Intersolv Inc, an applications enablement business, for and the combined business was renamed Merant. The same year the company acquired XDB Systems with their XDB Enterprise Server relational database management system. In 2001 the business was demerged from Merant with help from Golden Gate Capital Partners and once again became Micro Focus. It was listed on the London Stock Exchange in 2005. In May 2007, San Diego-based ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
