They are provided so that you can understand what is going on behind the. When a keyword is found, it is replaced by some text. Higher version of processor family also provide such facility. A macro processor is a program that copies a stream of text from one place to another, making a systematic set of replacements as it does so. Question bank unitiii macro processors unit iv macro processors 9 basic macro processor functions macro definition and expansion macro processor algorithm and data structures machineindependent macro processor features concatenation of macro parameters generation of unique labels conditional macro expansion keyword macro parameters macro. Usually a part of a compiler or an assembler, used to program a computer. System software an introduction to systems programming, 3 rd ed. The macro processor replaces each macro instruction with the corresponding group of source language statement, this is called expanding macros. The macro name table mnt, used to store the names of defined macros. This chapter describes a typical pattern that the sas system follows to process a program. Many programming language provide built in facilities for writing macros.
The macro begins with the %macro directive and ends with the %endmacro directive. To write a c program for the implementation of a macro processor in cs1207 system software lab. Write the advantage and disadvantages of general purpose macro processor. Macro definition and macro expansion insystem software. A macro consists of a name, a set of formal parameters and a body of code. Compiler a compiler is a computer program or a set of programs that transforms source code written in a programming language the source language into another computer language the target language. Macro are used to provide a program generation facility through macro expansion. A macro is a unit of specification for program generation through expansion. The following parameters of the sip config processor configuration macro relate to processor support. A pythonbased macro processing tool to extend clike languages with dsls. Macro processor pass two in c language projectsgeek.
Using a macro, programmer can define a single instruction to represent block of code. All macro invocation statements are expanded during the second pass. Define compiler, interpreter, assembler, linker, loader. Macro definition and call macro expansion,design of macro processor definition and expansion processing. Restriction the definition of a macro must appear in the source program before any statements that invoke that macro. Macro processor pass two in c language is the simulation of basic macro processor. 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. Question bank unitiii macro processors unit iv macro processors 9 basic macro processor functions macro definition and expansion macro processor algorithm and data structures machineindependent macro processor features concatenation of macro parameters generation of unique labels conditional macro. General purpose macro processor are not dependent on any particular programming language but can be used with a variety of different language 12. The example in this section shows you how the macro processor creates and resolves a.
This topic provides information about the m4 macro processor, which is a frontend processor for any programming language being used in the operating system environment at the beginning of a program, you can define a symbolic name or symbolic constant as a. The macro definition table mbt, used to store the body of the macro definitions. Tinnr the tinnr is an open source gnu general public license and free project. Writing a macro is another way of ensuring modular programming in assembly language. Ppt chapter 4 macro processors powerpoint presentation. Sometimes they are standalone programs that can be used to process any kind of text. Twopass macro processor would not allow the body of one macro instruction to contain definitions of other macros. A macro instruction is a notational convenience for the programmer.
These concepts are helpful in understanding how the macro processor works with other parts of the sas system. Each use of a macro generates new program instructions, the macro has the effect of automating writing. The following basic functions are discussed macro definition macro invocation macro call macro expansion parameter. 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. Features of macros facilities, macros and different types of parameters. Learn how to write a c code for macro processor using c language. This not only pushes the performance of the hardware, but also provides further connectivity and allows support for many addon peripherals. Macro instructions are single line abbreviations for group of instructions. System software and machine architecture the simplified instructional computer sic machine architecture data and instruction formats addressing modes instruction sets io and programming.
Define compiler, interpreter, assembler, linker, loader, macro. In modern 32 and 64 bit heres the so called real mode which supports also 16, and even 8, bit register, for backward compatibility. 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. It allows the programmer to write shorthand version of a program module programming the macro processor replaces each. A microprocessor is hardware, one type of computer implementation. This video discusses the basic functions of a macro processor with an example. Macro processor replace each macro instruction with the corresponding group of source language statements. A macro is a sequence of instructions, assigned by a name and could be used anywhere in the program. System software an introduction to systems programming, 3rd ed. Here you will need to provide assembly program containing macro as input in macin. 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 of replacements as it does so. For more information about the config macro, see config. Assemblersbasic assembler functions a simple sic assembler assembler algorithm and data structures machine dependent assembler features instruction formats. Beck written by wwf 1 chapter 4 macro processors z a macro represents a commonly used group of statements in the source programming language.
Macro is that the section of code that the programmer writes defines once, and then can use or invokes many times. In a program with macro activity, the macro processor can generate text that is placed on the input stack to be tokenized by the word scanner. This document is highly rated by computer science engineering cse students and has been viewed 30488 times. Onepass macro processor a onepass macro processor that alternate between macro definition and macro expansion in a recursive way is able to handle recursive macro definition.
Provides updated architecture and software examples, including the intel x86 family pentium, p6, etc. C program for the implementation of a macro processor. He then discusses both machinedependent and independent extensions to the basic concepts, and gives examples of the actual system software. A macro name is an abbreviation, which stands for some related lines of code. Chapter 4 macro processors 1 chapter 4 macro processors. Ppt macro processors powerpoint presentation free to. Aprntaddress of the system printer for use during the ipl sequence. The output macro source deck copy for use by pass 2 3.
The core of this new system software is the widely known linux operating system. The use of a macro name with a set of actual parameters is replaced by some code generated. In nasm, macros are defined with %macro and %endmacro directives. A macro processor is a program that reads a file or files and scans them for certain keywords. The macro processor replaces each macro instruction with the corresponding group of source language statements. Using macro instructions programmer can leave the mechanical details to be handled by the macro processor. A macro represents a commonly used group of statements in the source programming language. The following are the data bases used by the two passes of the macro processor. Generally it doesnt come as a separate program but as a bundle to either assembler or compiler. However, they are not required for most macro programming. Basically a processor emulates an older one so programs designed for that processor will run even on newer ones. Macro processors are often embedded in other programs, such as assemblers and compilers. Macros and macro processors free download as powerpoint presentation.
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