Dbx 1024 User's Guide download pdf (Page 33)

Chapter 4

4. Controlling dbx

This chapter describes features of dbx that affect its operation while

debugging a program. Speciﬁcally, this chapter covers:

• “Creating and Removing dbx Variables”

• “Using the History Feature and the History Editor”

• “Creating and Removing dbx Aliases”

• “Recording and Playing Back dbx Input and Output”

• “Executing dbx Scripts”

Creating and Removing

dbx

Variables

dbx allows you to deﬁne variables that you can use within dbx to store values.

These variables exist entirely in dbx; they are not part of your program. You

can use dbx variables for a variety of purposes while debugging. For

example, you can use dbx variables as temporary storage, counters, or

pointers that you use to step through arrays.

dbx also provides many predeﬁned variables that control how various dbx

commands function. Appendix C, “Predeﬁned dbx Variables” provides a

complete list of predeﬁned dbx variables and their purposes.

A dbx variable does not have a ﬁxed type. You can assign a dbx variable any

type of value, even if it already has a value of a different type. However, a

variable predeﬁned by dbx does have a ﬁxed predeﬁned type.

You can use almost any name for dbx variables. A good practice to follow is

to use a dollar sign ($) as the ﬁrst character of all dbx variables to prevent

conﬂicts with most program variable names. All of dbx’s predeﬁned

variables begin with a dollar sign.

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Dbx 1024 User's Guide Page 33