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The way to fix errors is to load the ASM file back into your text editor and start hunting up the error This loopback is shown in Figure 45 The error message will almost always contain a line number Move the cursor to that line number and start looking for the false and the fanciful If you find the error immediately, fix it and start looking for the next Here's a little logistical snag: How do you make a list of the error messages on paper so that you don't have to memorize them or scribble them down on paper with a pencil You may or may not be aware that you can redirect the assembler's error message displays to a DOS text file on disk It works like this: You invoke the assembler just as you normally would, but add the redirection operator ">" and the name of the text file to which you want the error messages sent If you were assembling FOOASM with NASM and wanted your error messages written out to a disk file named ERRORSTXT, you would invoke NASM this way: C:\ASM>NASM FOO > ERRORSTXT (I've omitted certain command-line parameters for simplicity's sake) Here, error messages will be sent to ERRORSTXT in the current DOS directory C:\ASM When you use redirection, the output does not display on the screen The stream of text from NASM that you would ordinarily see is quite literally steered in its entirety to another place, the file ERRORSTXT Once the assembly process is done, the DOS prompt will appear again You can then print the ERRORSTXT file on your printer and have a handy summary of all that the assembler discovered was wrong with your source code file Note well that if you're using an interactive development environment like NASM-IDE (which is provided on this book's CD-ROM and described in detail in the next chapter), you won't have to bother with redirection to a file or to the printer NASM-IDE and other development environments accumulate error messages in a separate window that you can keep on display while you go back and edit your ASM file This is a much more convenient way to work, and I powerfully recommend it
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As taciturn a creature as an assembler may appear to be, it genuinely tries to help you any way it can One way it tries to help is by displaying warning messages during the assembly process These warning messages are a monumental puzzle to beginning assembly language programmers: Are they
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errors or aren't they Can I ignore them or should I fool with the source code until they go away Alas, there's no clean answer Sorry about that Warnings are the assembler acting as experienced consultant, and hinting that something in your source code is a little dicey Now, in the nature of assembly language, you may fully intend that the source code be dicey In an 86-family CPU, dicey code may be the only way to do something fast enough, or just to do it at all The critical factor is that you had better know what you're doing (And if you're reading this book, my guess is that you probably don't) The most common generator of warning messages is doing something that goes against the assembler's default conditions and assumptions If you're a beginner doing ordinary, 100-percent-bythe-book sorts of things, you should crack your assembler reference manual and figure out why the assembler is tut-tutting you Ignoring a warning may cause peculiar bugs to occur later on during program testing Or, ignoring a warning message may have no undesirable consequences at all I feel, however, that it's always better to know what's going on Follow this rule: Ignore an assembler warning message only if you know exactly what it means In other words, until you understand why you're getting a warning message, treat it as though it were an error message Only once you fully understand why it's there and what it means should you try to make the decision whether to ignore it or not In summary: The first part of the assembly language development process (as shown in Figure 45) is a loop You must edit your source code file, assemble it, and return to the editor to fix errors until the assembler spots no further errors You cannot continue until the assembler gives your source code file a clean bill of health When no further errors are found, the assembler will write an OBJ file to disk, and you will be ready to go on to the next step
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