what abstract syntax tree

Compilation processWhether it is a physical or virtual machine, most of the program code starts with the compilation to the target code of the physical machine or the instruction set executed by the virtual function, as shown in the various

JVM-program compilation and code early (during compilation) optimization, jvm-CompilationEarly (Compilation) Optimization I. Javac Compiler 1. Javac source code and debugging The source code of Javac is stored in

Reprint Please specify source:http://blog.csdn.net/ns_code/article/details/18009455compilation ProcessWhether it is a physical or virtual machine, most of the program code starts with the compilation to the target code of the physical machine or the

The interpreter pattern (interpreter), given a language, defines a representation of its grammar, and defines an interpreter that uses the representation to interpret a sentence in a language. The interpreter pattern needs to address that if a

In Gof's design model: The basics of reusable object-oriented software, the interpreter pattern is said: Given a language, define a representation of its grammar, and define an interpreter that uses that representation to interpret the sentences in

In-depth understanding of webkit kernel Series 2: Deep parsing of JavaScript Engine, webkitjavascript The article [WebKit] JavaScriptCore parsing-basics (iii) from script code to JIT compiled code implementation written by HorkeyChen is well written

The Java compiler is generally divided into the front-end compiler, the JIT (just in time compiler) compiler, the AOT (Ahead of Time compiler) compiler three. Front-end compilers: compilers that compile Java files into class files,

First, a primer In fact, there is no good example to introduce the interpreter pattern, because it describes how to form a simple language interpreter, the main application in the use of object-oriented language development compiler; In practical

Code compilation is done by the Javac compiler, as shown in Figure 1 below: Figure 1 Javac is a compiler that translates a language specification into another language specification, usually compilers translate language specifications that are

Reprint Please specify source: http://blog.csdn.net/l1028386804/article/details/45599443I. OverviewGiven a language, define a representation of its grammar and define an interpreter that interprets the sentences in the language using that

1.php is an analytic high-level language, Zend kernel using C language implementation, there is a main function, PHP script is input, kernel processing output results, the kernel translates php script into C program to recognize the opcode is PHP

In the execution of hive statements, it is inevitable to be curious about the implementation of hive, through the explain can see the hive transformation of the abstract syntax tree and operation descriptor hive> explain extended select SUM (shopid)

"Digestion of type names" is the digestion of types. The type name is represented by the TypeRef object, and the type is represented by the types object. The digestion of a type name is the conversion of a TypeRef object to a type object.The

Android has launched its new runtime art in 4.4, ready to replace Dalvik for some time. But it was still a beta, and the protagonist was still Dalvik. Until this year's Google I/O Conference, Art formally replaced Dalvik. This news in the scientific

(1) Use C #4 to write dynamic code C #4 adds a dynamic keyword, which can be used to compile "dynamic" code. For example, the following code creates an expandoobject object (which must be defined as dynamic ):   Dynamic dynamicobj = new

What is Javac? Javac is a compiler that can speak a language specification into another language specification. such as c,c++ is the source code directly compiled into the target machine code, the target machine code is directly executed by the

How a virtual machine executes a bytecode directive in a method. The execution engine of many Java virtual machines has the option of interpreting execution (through the interpreter) and compiling (generating local code execution via an instant

How to Understand the scope in JavaScript What are variables and scopes? Variable: Simply put, it is to save a name for a specific value within a specific period of time. Because there is no rule to define a variable that must save a certain data

Explain syntax Hive provides the explain command to display the query execution plan. Syntax: Explain [extended] Query The explain statement uses extended to provide additional information about the operation in the execution plan. This is a

Mode motiveIf a particular type of problem occurs in the system at a very high frequency, consider describing an instance of the problem as a sentence in a language, so you can build an interpreter that solves these problems by interpreting these