Macro processor in system software notes

In modern 32 and 64 bit heres the so called real mode which supports also 16, and even 8, bit register, for backward compatibility. Macro processor designs are not directly related to the computer architecture on which it runs. Macro processor b macro pre processor c micro pre processor d assembler ans. Macro instructions are single line abbreviations for group of instructions. Many computer gives use macro instructions to automate the writing of tailored operating systems in a process called as system generation. It is the basic unit that takes inputs and produces an output after processing the data. I wrote these introductory notes, and the program notes below. Mp reduces the amount of work necessary to extend c by extracting the relevant blocks to process and calling usersupplied python functions to handle the macro. Both the name of the macro definition and other variable parameter attributes are included. Using a macro, programmer can define a single instruction to represent block of code. From the time the word scanner triggers the macro processor until that macro processor action is complete, the macro processor controls all activity. Systems programming multiple choice questions and answers. Macro processors can also be used with highlevel programming.

Generally it doesnt come as a separate program but as a bundle to either assembler or compiler. The macro processor replaces each macro instruction with the corresponding group of source language statement, this is called expanding macros. Macro processor involves definition, invocation and expansion. For every occurrence of macro the whole macro body or macro block of statements gets expanded in the main source.

Basic macro processor functions macro definition and. Net macro processor nmp is a general purpose text macro processor for. It initializes various registers to initiate execution. This document is highly rated by computer science engineering cse students and has been viewed 30846 times. A directory of objective type questions covering all the computer science subjects. The macro processor reads the source statements and performs all of its functions, the output lines are passed to the language translator as they are generated. The processing would proceed normally until line 50, which contains a statement invoking rdchar in addaddto,t eagu e t o t eo g a acoition, the argument from the original macro. A generalpurpose macro processor or general purpose preprocessor is a macro processor that is not tied to or integrated with a particular language or piece of software a macro processor is a program that copies a stream of text from one place to another, making a systematic set. Macro processor replace each macro instruction with the corresponding group of source language statements. When the sas system option nocmdmac option is in effect, the macro processor treats only the words following the % symbols as potential macro. For an embedded system designer, it is necessary to have the knowledge of both microprocessors and microcontrollers. Two pass macro processor would not allow the body of one macro instruction to. Presentation of the construction of several system software such as assembler, linker, loader, macro processor, and other software. It calculates the size of a program instructions and data and create memory space for it.

Macro processor a macro represents a commonly used group of statements in the source programming language. Macro processor is a program that lets you define the code that is reused many times giving it a specific macro name and reuse the code by just writing the macro name only. All macro invocation statements are expanded during the second pass. System programming download free lecture notes slides. Psu cs status 1152012 introductory notes cs 200 has been eliminated.

Using macro instructions programmer can leave the mechanical details to be handled by the macro processor. Page 1 chapter 04 macro language and the macro processor macro instructions in assembly language programming it is often that some set or block of statements get repeated every now. In its simplest form, a macro is an abbreviation for a sequence of operations. The use of a macro name with a set of actual parameters is replaced by some code generated. Be they simple or complex input is read from a source text file, processed by one of the nmp hosts and then output to one.

Macro processor desiggpn options recursive macro expansion applying al ith f fi 4 5algorithm of fig. A macro is a unit of specification for program generation through expansion. A macro consists of a name, a set of formal parameters and a body of code. Macros and macro processors free download as powerpoint presentation.

During macro compilation, the macro processor does the following. Define compiler, interpreter, assembler, linker, loader. Practice these mcq questions and answers for preparation of various competitive and entrance exams. So the resultant of the macro code is shown on the right most side of the figure. The mapping process that instantiates transforms a macro use into a specific. The programmer specifies the series of variables to be operated on a, b. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Macro processor notes parameter computer programming. If cmdmac is in effect and you have defined a commandstyle macro in your program, the macro processor scans the first word of every sas command to see whether it is a commandstyle macro invocation. A macro short for macroinstruction, from greek long in computer science is a rule or pattern that specifies how a certain input sequence often a sequence of characters should be mapped to a replacement output sequence also often a sequence of characters according to a defined procedure. A macro represemts a commonly used group of statements in the source programming language 1.

Macro is that the section of code that the programmer writes defines once, and then can use or invokes many times. Multiple choice questions on systems programming topic macro processor. A macro represents a commonly used group of statements in the source programming language. Some concepts related to operating system such as virtual memory will also be covered to make this course a selfcontained course. When used, a macro expands from its compressed form into its actual instruction details. Every macro begins with macro keyword at the beginning and ends with the endm end macro. It is easy to design a twopass macro processor in which all macro definitions are processed during the first pass, and all macro invocation statements are expanded during the second pass. Loader is a part of operating system and is responsible for loading executable files into memory and execute them. The macro processor construct the symbols by concatenating x, a, b, and 1,2,3, in the macro expansion. Macros and macro processors macro computer science.

Macro represents a group of commonly used statements in the source programming language. Macro calling in high level programming languages c programming. A generalpurpose macro processor or general purpose preprocessor is a macro processor that is not tied to or integrated with a particular language or piece of software. A macro facility is an addon piece of system software, a convenience for the programmer, to facilitate production of multiple lines of commonly occurring code via single macro calls embedded in the programmers assembly program. Editors and its types in system programming geeksforgeeks. Twopass macro processor would not allow the body of one macro instruction to contain definitions of other macros. While the macro processor is active, no activity occurs in the word scanner or the data step compiler. System software vtu notes pdf ss pdf vtu smartzworld. A macro instruction macro is a notational convenience for the programmer it allows the programmer to write shorthand version of a program module programming the macro processor replaces each macro instruction with the corresponding group of source language statements expanding normally, it performs no analysis of the text it handles. A pythonbased macro processing tool to extend clike languages with dsls. Macro is that the section of code that the programmer writes defines once, and then can use or. The programmer wants to write a macro to process each series of variables. Basically a processor emulates an older one so programs designed for that processor will. Basic macro processor functions macro invocation oft f d toften referred to as a macro call need the name of the macro instruction begin invoked and the arguments to be used in expanding the macro expanded program figure 4.

Read, highlight, and take notes, across web, tablet, and phone. Ppt chapter 4 macro processors powerpoint presentation. It was ported to mini6 systems and was the main component involved in the system generation for this family of computers. The macro processor replaces each macro instruction with the corresponding group of source language statements. System software an introduction to systems programming, 3rd ed.