Notes on assembly language macros university of north. The definition of a macro must appear in the source program before any statements that invoke that macro. Pass 2 processing macro calls and expansion macro name found. All macro invocation statements are expanded hthowever, a twopass macro processor would tld not allow the body of one macro instruction to contain dfiiti f thdefinitions of other macros see figure 4. However, such a macro processor cannot allow the body of one macro instruction to contain definitions of other macros. A macro is called by writing the macro name in the mnemonic field. Because of the onepass structure, the definition of a macro must appear in the source program before any. Pass1 of two pass macro processor prashant kulkarni. Pass 1 pass 1 processing macro definitions mdtc pdf is in addition to one of the windows to reach and way in. At the beginning of a program, you can define a symbolic name or symbolic constant as a particular string of characters. 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. Example from book systems programming and operating systems by.
The advantages of incorporating the macro processor into pass 1 is are. All macro invocation statements are expanded during the second pass. A onepass macro processor that alternate between macro definition and macro expansion in a recursive way is able to handle recursive macro definition. The example in this section shows you how the macro processor creates and resolves a macro variable. How sas processes statements with macro activity 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. Read pdf system software leland l beck 3rd edition free system software leland l beck 3rd. Twopass macro processor like an assembler or a loader, we can design a twopass macro processor in which. Expand all macro invocation statements however, onepass may be enough because all macros would have to be defined during the first pass before any. Macro processor b macro preprocessor c micro preprocessor d assembler ans. The example in this section shows you how the macro processor creates and resolves a. However, such a twopass macro processor would not allow the body of one macro instruction to contain definitions of other macros because all macros would have to be defined during the first pass before any macro invocations were expanded.
Learn how to write a c code for macro processor using c language. Macro definitions are typically located at the start of a program. March 21, 2015 in system programming compiler construction tags. Macro definition consist of a macro prototype statement one or more model statement macro preprocessor statement. For these functions the entire call to the function and its text is passed to the macro processor where it is resolved. Because of the onepass structure, the definition of a macro must appear in the source program before any statements that invoke that macro. Twopass macro processor you may design a twopass macro processor o pass 1. Apply microsoft excel macros to a lot of documents with this automation tool.
Handson sas macro programming essentials for new users. It is easy to design a twopass macro processor pass 1. Two pass macro processor would not allow the body of one macro instruction to contain definitions of other macros. H however, a ttwopass macro processor would ld nott allow the body of one macro instruction to contain d fi iti definitions off other th macros see figure 4.
Elements of assembly language programming, design of the assembler, assembler design. Macro processor parameter computer programming scribd. Because of the one pass structure, the definition of a macro must appear in the source program before any statements that invoke that macro. Nmp allows you to implement one macro, several macros or whole libraries of macros that allow you to transform the input. Macro processors flowchartspass 1processing macro definitionspass 2processing macro calls and expansion 2. Pass 2 supply expanded source file to assembler processing write into expanded source card file read next source card copied by pass 1 mdtp one pass macro preprocessor preprocessor. Net macro processor nmp is a general purpose text macro processor for. A macro prototype statement one or more model statements macro preprocessor statements the macro prototype statement declares the name of a macro and the names and kinds of its parameters. Here you will need to provide assembly program containing macro as input in macin. Feb 21, 20 macro processors flowchartspass 1processing macro definitionspass 2processing macro calls and expansion 2. May 22, 2016 for the love of physics walter lewin may 16, 2011 duration.
Implementation of a twopass assembler using python sic. The advantages of incorporating the macro processor into. The single quotation marks are used to prevent the macro processor from resolving the argument before or while the data step is compiled. Restriction the definition of a macro must appear in the source program before any statements that invoke that macro. May 04, 2011 macro processor pass two in c language is the simulation of basic macro processor. However, because of the one pass structure, the definition of a macro must appear in the source program before any statements that invoke that macro. Oct 24, 2011 enter your email address to follow this blog and receive notifications of new posts by email. Storing and using a list of values in a macro variable. A onepass macro processor that can alternate between macro definition and macro expansion is able to handle macros like those in fig 4. Expand all macro invocation statements however, one pass may be enough because all macros would have to be defined during the first pass before any. It is called a macro processor because it allows you to define macros, which are brief abbreviations for longer constructs the c preprocessor provides four separate facilities that you can use as you see fit. 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.
The microprocessor you are using might be a pentium, a k6, a powerpc, a sparc or any of the many other brands and types of microprocessors, but they all do approximately the. Pass 1 pass 1 processing macro definitions mdtc one pass macro processor a one pass macro processor that alternate between macro definition and macro expansion is able to handle macro in macro. The macro name table mnt, used to store the names of defined macros. Macro processor pass two in c language is the simulation of basic macro processor.
A onepass macro processor th tthat can alternate between macro definition and macro expansions able to handle macros like those in figure 4. Excel macro processor allows you to apply macros to a lot of excel documents. Suppose that the processor encountered a line, %change. The word scanner reads the generated text from the input stack, and tokenizes it. Expand all macro invocation statements however, onepass may be enough o because all macros would have to be defined during the first pass before any macro invocations were expanded. Unit 2 macro processor and assembler 7 hours macroprocessor. When you define a macro, you provide text usually assembly code that you want to associate with a macro name. Single pass every macro must be defined before it is called onepass processor can alternate between macro definition and macro expansion nested macro definitions may be allowed but nested calls are not two pass algorithm pass1. Macro processor overview basic functions features machine independent design. Introduction, macro definition and call, macro expansion, nested macro calls, design of macro processor, design issues of macro processors, two pass macro processors, one pass macro processors.
Macro quoting is needed because the macro processor must know whether to interpret a particular special character as text or as a symbol in the macro language. However, because of the onepass structure, the definition of a macro must appear in the source program before any statements that invoke that macro. However, such a two pass macro processor would not allow the body of one macro instruction to contain definitions of other macros because all macros would have to be defined during the first pass before any macro invocations were expanded. Macro processor and assembler 7 hours macroprocessor. Macro processor parameter computer programming macro. The result of this execution is the production of character information, macro variables, or sas statements, which are then be passed to the data or proc step. Onepass macro processor a onepass macro processor that alternate between macro definition and macro expansion is able to handle macro in macro. The way of avoiding such errorprone method will be discussed in section 4. A onepass macro processor that can alternate between macro definition and macro expansion. Cse system software leland beck one pass macro processor algorithm explanation part 2. Two pass macro processor o two pass macro processor n pass1. Qlikview open existing excel macro in titlesummary. A one pass macro processor that can alternate between macro definition and macro expansion.
Feb 21, 2018 twopass macro processor like an assembler or a loader, we can design a twopass macro processor in which. It needs to know if it is a call to a macro named change, or just a text string, possibly a shortcut of, percent change. The macro processor executes the compiled %do instructin and recognizes that the next item is text. Some functions of the sas macro processor are to pass symbolic values between sas statements and steps, to establish default symbolic values, to conditionally execute sas steps, and to invoke very long, complex code in a quick, short way. The macro definition table mbt, used to store the body of the macro definitions. Introduction, macro definition and call, macro expansion, nested macro calls, design of macro processor, design issues of macro processors, twopass macro processors, onepass macro processors. The c preprocessor is a macro processor that is used automatically by the c compiler to transform your program before actual compilation. One pass macro processor every macro must be defined before it is called onepass. Macro processor free download as powerpoint presentation. The other quoting functions are resolved during the execution of the macro.
It should be noted that the macro processor is the sas. Assembly language macros an assembly language macro is a template whose format represents a pattern of 0 or more assembly language statements that might be common to multiple programs. Automatic variables are global except syspbuff, which is local. The output macro source deck copy for use by pass 2 3. Writing cleaner and more powerful sas code using macros. Macro parameters the ability to pass parameters to macros make them much more useful. Macro processor, macros, macros vs functions, two pass macro processor, two pass macro processor program in java. Because you are writing a program that writes a program, this is sometimes called meta programming. The following are the data bases used by the two passes of the macro processor. Expand all macro invocation statements however, one pass may be enough because all macros would have to be defined during the first pass before any macro invocations were expanded. The macro processor places the text on top of the input stack and waits for the word scanner to begin tokenization. The macro prototype statement declares the name of a macro and the names and kinds of its parameters. However, a two pass macro processor would not allow the body of one macro.
Macros1 chapter 4 macro processors basic macro processor. A macro definition is enclosed between a macro header statement and macro end statement. One or more model statements c macro preprocessor statements d all of the above. The video describes how to implement a twopass assembler using python programming language, for an sic machine hypothetical machine. Macro processor algorithm andmacro processor algorithm and data structuresdata structures. The microprocessor is the heart of any normal computer, whether it is a desktop machine, a server or a laptop. Macro preprocessor is a software which accepts an assembly language program that consist of macro definition and macro calls and converts it into an assembly language program with out macro calls and macro expansion assembly lang.
Two pass macro processor program in java alka tanks. Enter your email address to follow this blog and receive notifications of new posts by email. Aug 11, 2015 here is implementation of macro processor in c. Semantic processing by macro processors by eric ray.
Two pass macro processor you may design a two pass macro processor pass 1. A macro processor enables you to define and to use macros in your assembly programs. In a two pass assembler, the task of the pass ii is to a separate the symbol, mnemonic opcode and operand fields. Chapter 4 macro processors basic macro processor functions. When you invoke sas, the macro processor creates automatic macro variables that supply information related to the sas session. Download as ppt, pdf, txt or read online from scribd. Macro processor pass two in c language projectsgeek.
This paper explains details of two macro masking functions. Functions are combined and it is not necessary to create intermediate files as output from the macro processor and input to the assembler c. Writing cleaner and more powerful sas code using macros patrick breheny. This restriction does not create any real inconvenience.