Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
Programming Languages Articles
Page 9 of 18
What is Stack Allocation?
The stack allocation is a runtime storage management technique. The activation records are pushed and popped as activations begin and end respectively.Storage for the locals in each call of the procedure is contained in the activation record for that call. Thus, locals are bound to fresh storage in each activation, because a new activation record is pushed onto the stack when the call is made.It can be determined the size of the variables at a run time & hence local variables can have different storage locations & different values during various activations. Suppose that the registered top marks the top ...
Read MoreWhat is Static Allocation?
It is the simplest allocation scheme in which allocation of data objects is done at compile time because the size of every data item can be determined by the compiler. The main function of static allocation is to bind data items to a particular memory location. The static memory allocation procedure consists of determining the size of the instruction and data space.Recursive Subprogram and Arrays of adjustable length are not permitted in a language. In static allocation, the compiler can decide the amount of storage needed by each data object. Thus, it becomes easy for a compiler to find the ...
Read MoreDescribe the issues in a programming language design that affects storage management?
There are various issues in programming language design that affect the utilization of storage by a running program. There are several elements to which storage must be allocated to execute the object program. Storage space is majorly required for object programs and user-defined data structures, variables, and constants. There is also a need for storage space for procedure linkage information, temporaries required for expression evaluation, and parameter passing.There are the different ways in which various programming languages arrange space for object program are −Static storage allocation− It is the simplest allocation scheme in which allocation of data objects is done ...
Read MoreWhat is factors which affect the implementation of programming language?
Some factors affect the implementation of programming languages which are as follows −Scope − The scope of a declaration is that portion of a program where that declaration is applied. The implementation mechanism may be different for different languages. Scope rules for each language determine how to go from the declaration of the name. The usage of a name in a procedure is local if it is within the scope of a declaration within that procedure otherwise the usage is non-local. According to the scope of variables in a particular language, storage management is implemented.Lifetime of variable− The lifetime of ...
Read MoreWhat is role of Run-time Storage Management in compiler design?
The compiler demands a block of memory for the operating system. The compiler utilizes this block of memory executing the compiled program. This block of memory is called storage management. One of the important tasks that a compiler must perform is to allocate the resources of the target machine to represent the data objects that are being manipulated by the source program.A compiler must decide the runtime representation of the data objects in the source program. In the source program, runtime representations of the data objects, such as integers and real variables, usually take the form of equivalent data objects ...
Read MoreWhat is two array representations in the symbol table?
Symbol Table is a data structure that supports an effective and efficient way of storing information about various names appearing in the source program. These names are used in the source code to identify the different program elements, like a variable, constants, procedures, and the labels of statements.The symbol table is searched each time a name is encountered in the source text. When a new name or new data about an existing name is found, the content of the symbol table modifies.Therefore, the symbol table must have an efficient mechanism for accessing the data held in the table also for ...
Read MoreVerifying whether the string id * id + id is accepted by a given grammar using SLR parsing\\nConsider the SLR parsing table for the Grammar\\nE → E + T\\nE → T\\nT → T ∗ F\\nT → F\\nF → (E)\\nF → id\\nCheck whether the string id * id + id is accepted or not by using the SLR parsing table constructed in the example.
Problem Statement Verifying whether the string id * id + id is accepted by a given grammar using SLR parsingConsider the SLR parsing table for the GrammarE → E + TE → TT → T ∗ FT → FF → (E)F → idCheck whether the string id * id + id is accepted or not by using the SLR parsing table constructed in the example. SolutionInitially, LR Parser in state 0.Put $ at the end of the string, i.e., id * id + id $.StackInput StringReason0id ∗ ...
Read MoreWhat is an Activation Record?
An Activation Record is a data structure that is activated/ created when a procedure/function is invoked, and it includes the following data about the function.Activation Record in 'C' language consist ofActual ParametersNumber of ArgumentsReturn AddressReturn ValueOld Stack Pointer (SP)Local Data in a function or procedureHere, Old SP stores the value of stack pointer of Activation Record of procedure which has called this procedure which leads to the generation of this Activation Record, i.e., It is a pointer to the activation record of the caller.In Stack Allocation Scheme, when procedure A calls Procedure B, the activation record for B will be ...
Read MoreWhat are Lists and Self-Organizing lists in compiler design?
ListsIt is conceptually simplest and easy to implement a data structure for the symbol table in a linear list of records, as shown below −It can use an individual array to store the name and its associated information. New Names are inserted to the list in the order in which they are encountered. It can retrieve data about a name we search from the starting of the array up to the position marked by the pointer AVAILABLE which indicates the beginning of the empty portion of the array.When the name is placed, the associated data can be discovered in the ...
Read MoreWhat is Search Tree and Hash Tables in compiler design?
Search TreeA more effective technique to symbol table organization is to add two link fields, LEFT and RIGHT, to every record. We use these fields to link the records into a binary search tree.This tree has the property that all names NAME (j) accessible from NAME (i) by following the link LEFT (i) and then following any sequence of links will precede NAME (i) in alphabetical order (symbolically, NAME (j) < NAME (i))Similarly, all names NAME (k) accessible starting with RIGHT (i) will have the property that NAME (i) < NAME (k). Thus, if we are searching for NAME and ...
Read More