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Semantic Analysis As the AST is being built, the tool builds a symbol table alongside it For each identi er in the program, the symbol table associates the identi er with its type and a pointer to its declaration or de nition With the AST and the symbol table, the tool is now equipped to perform type checking A static analysis tool might not be required to report typechecking errors the way a compiler does, but type information is critically important for the analysis of an object-oriented language because the type of an object determines the set of methods that the object can invoke Furthermore, it is usually desirable to at least convert implicit type conversions in the source text into explicit type conversions in the AST For these reasons, an advanced static analysis tool has to do just as much work related to type checking as a compiler does In the compiler world, symbol resolution and type checking are referred to as semantic analysis because the compiler is attributing meaning to the symbols found in the program Static analysis tools that use these data structures have a distinct advantage over tools that do not For example, they can correctly interpret the meaning of overloaded operators in C++ or determine that a Java method named doPost() is, in fact, part of an implementation of HttpServlet These capabilities enable a tool to perform useful checks on the structure of the program We use the term structural analysis for these kinds of checks For more, see the sidebar Checking Structural Rules After semantic analysis, compilers and more advanced static analysis tools part ways A modern compiler uses the AST and the symbol and type information to generate an intermediate representation, a generic version of machine code that is suitable for optimization and then conversion into platform-speci c object code The path for static analysis tools is less clear cut Depending on the type of analysis to be performed, a static analysis tool might perform additional transformations on the AST or might generate its own variety of intermediate representation suitable to its needs If a static analysis tool uses its own intermediate representation, it generally allows for at least assignment, branching, looping, and function calls (although it is possible to handle function calls in a variety of ways we discuss function calls in the context of interprocedural analysis in Section 44) The intermediate representation that a static analysis tool uses is usually a higher-level view of the program than the intermediate representation that a compiler uses For example, a C language compiler likely will convert all references to structure elds into byte offsets into the structure for its intermediate representation, while a static analysis tool more likely will continue to refer to structure elds by their names.

benchmark(message = "Benchmarking", options = {})

with a persistence context and placed in the managed state After the component has nished operating on LoanApplication and the unit of work has completed, the persistence context is closed and LoanApplication is placed in the detached state The component may still access and manipulate the LoanApplication object, but its data is not guaranteed to be synchronized with the database Later, the LoanApplication object may become associated with a new persistence context using the EntityManager merge() operation When changes tracked by the new persistence context are sent to the database, updates made to the

Wrap this block around expensive operations or possible bottlenecks to get a time reading for the operation For example, let s say you thought your file processing method was taking too long; you could wrap it in a benchmark block

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That would add an entry like Process data files (3452ms) to the log, which can then be used to compare timings when optimizing your code You may give an optional logger level as the :level option Valid options are :debug, :info, :warn, and :error The default level is :info

While he was an intern at Fortify, Aaron Siegel created a language for describing structural program properties In the language, a property is de ned by a target AST node type and a predicate that must be true for an instance of that node type to match Two examples follow In Java, database connections should not be shared between threads; therefore, database connections should not be stored in static elds To nd static elds that hold database connections, we write

Finally, you can pass true as the third argument to silence all log activity inside the block This is great for boiling down a noisy block to just a single statement:

benchmark "Process data files", :level => :info, :silence => true do expensive_and_chatty_files_operation end

Field: static and typename == "javasqlConnection"

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