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In computing, in particular compiler construction, value range analysis is a type of data flow analysis that tracks the range (interval) of values that a numeric variable can take on at each point of a program's execution. [1]
The Java virtual machine's set of primitive data types consists of: [12] byte, short, int, long, char (integer types with a variety of ranges) float and double, floating-point numbers with single and double precisions; boolean, a Boolean type with logical values true and false; returnAddress, a value referring to an executable memory address ...
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Given a function that accepts an array, a range query (,) on an array = [,..,] takes two indices and and returns the result of when applied to the subarray [, …,].For example, for a function that returns the sum of all values in an array, the range query (,) returns the sum of all values in the range [,].
Java is a high-level, class-based, object-oriented programming language that is designed to have as few implementation dependencies as possible. It is a general-purpose programming language intended to let programmers write once, run anywhere (), [16] meaning that compiled Java code can run on all platforms that support Java without the need to recompile. [17]
In computer programming, bounds checking is any method of detecting whether a variable is within some bounds before it is used. It is usually used to ensure that a number fits into a given type (range checking), or that a variable being used as an array index is within the bounds of the array (index checking).
store int value into variable 1 istore_2 3d 0011 1101 value → store int value into variable 2 istore_3 3e 0011 1110 value → store int value into variable 3 isub 64 0110 0100 value1, value2 → result int subtract iushr 7c 0111 1100 value1, value2 → result int logical shift right ixor 82 1000 0010 value1, value2 → result int xor jsr † a8
Value range propagation [9] – precompute the potential ranges a calculation could be, allowing for the creation of branch predictions in advance; Sparse conditional constant propagation – range-check some values, allowing tests to predict the most likely branch; Dead-code elimination – remove code that will have no effect on the results