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. 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. A pythonbased macro processing tool to extend clike languages with dsls. Psu cs status 1152012 introductory notes cs 200 has been eliminated. The macro processor replaces each macro instruction with the corresponding group of source language statement, this is called expanding macros. The macro processor replaces each macro instruction with the corresponding group of source language statements. 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.
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. The mapping process that instantiates transforms a macro use into a specific. 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. A macro is a unit of specification for program generation through expansion. A directory of objective type questions covering all the computer science subjects. All macro invocation statements are expanded during the second pass. Macro processor desiggpn options recursive macro expansion applying al ith f fi 4 5algorithm of fig. The use of a macro name with a set of actual parameters is replaced by some code generated. 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.
The macro processor operates as a sort of input routine for the assembler or. Macro is that the section of code that the programmer writes defines once, and then can use or invokes many times. Note, because the csie students will have to take a mandatory compiler course next semester, the construction of compilers will not be presented in this course. When used, a macro expands from its compressed form into its actual instruction details.
Read, highlight, and take notes, across web, tablet, and phone. 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. Macros and macro processors macro computer science. Multiple choice questions on systems programming topic macro processor. Net macro processor nmp is a general purpose text macro processor for. It calculates the size of a program instructions and data and create memory space for it. From the time the word scanner triggers the macro processor until that macro processor action is complete, the macro processor controls all activity. Some concepts related to operating system such as virtual memory will also be covered to make this course a selfcontained course. A macro represents a commonly used group of statements in the source programming language. Define compiler, interpreter, assembler, linker, loader. A macro consists of a name, a set of formal parameters and a body of code. It is the basic unit that takes inputs and produces an output after processing the data. It initializes various registers to initiate execution. Macro calling in high level programming languages c programming.
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. The programmer wants to write a macro to process each series of variables. Twopass macro processor would not allow the body of one macro instruction to contain definitions of other macros. A macro instruction is a group of programming instructions that have been compressed into a simpler form and appear as a single instruction. Macro processors can also be used with highlevel programming. Macro processor replace each macro instruction with the corresponding group of source language statements. Macro processor a macro represents a commonly used group of statements in the source programming language. I wrote these introductory notes, and the program notes below. 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. During macro compilation, the macro processor does the following. System software an introduction to systems programming, 3rd ed. The programmer specifies the series of variables to be operated on a, b. Both the name of the macro definition and other variable parameter attributes are included. A macro instruction macro is a notational convenience for the programmer o it allows the programmer to write shorthand version of a program module programming the macro processor replaces each macro instruction with.
Macro represents a group of commonly used statements in the source programming language. Basically a processor emulates an older one so programs designed for that processor will. System software vtu notes pdf ss pdf vtu smartzworld. While the macro processor is active, no activity occurs in the word scanner or the data step compiler.
Editors and its types in system programming geeksforgeeks. Macro is that the section of code that the programmer writes defines once, and then can use or. 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. Twopass 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. For an embedded system designer, it is necessary to have the knowledge of both microprocessors and microcontrollers.
It was ported to mini6 systems and was the main component involved in the system generation for this family of computers. So the resultant of the macro code is shown on the right most side of the figure. When the sas system option nocmdmac option is in effect, the macro processor treats only the words following the % symbols as potential macro. System programming download free lecture notes slides. 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. Macro processor b macro pre processor c micro pre processor d assembler ans. Many computer gives use macro instructions to automate the writing of tailored operating systems in a process called as system generation. 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.
The macro processor construct the symbols by concatenating x, a, b, and 1,2,3, in the macro expansion. For every occurrence of macro the whole macro body or macro block of statements gets expanded in the main source. Using a macro, programmer can define a single instruction to represent block of code. Macro instructions are single line abbreviations for group of instructions. Text items are underlined in the illustrations in this section. Macro processor involves definition, invocation and expansion. Generally it doesnt come as a separate program but as a bundle to either assembler or compiler. Ppt chapter 4 macro processors powerpoint presentation. Practice these mcq questions and answers for preparation of various competitive and entrance exams. Using macro instructions programmer can leave the mechanical details to be handled by the macro processor. A macro represemts a commonly used group of statements in the source programming language 1.
Macro processor notes parameter computer programming. Macros and macro processors free download as powerpoint presentation. Every macro begins with macro keyword at the beginning and ends with the endm end macro. 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. This document is highly rated by computer science engineering cse students and has been viewed 30846 times. Basic macro processor functions macro definition and. Macro processor designs are not directly related to the computer architecture on which it runs.
Loader is a part of operating system and is responsible for loading executable files into memory and execute them. Unix systems have a generalpurpose macro processor called m4. 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. Two pass macro processor would not allow the body of one macro instruction to. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. In modern 32 and 64 bit heres the so called real mode which supports also 16, and even 8, bit register, for backward compatibility.
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