TotalView Users Guide - CI Wiki

Using the Evaluate Window
Using the Evaluate Window
TotalView lets you open a window to evaluate expressions in the context of
a particular process and evaluate them in C, Fortran, or assembler.
Not all platforms let you use assembler constructs. See “Architectures” in the TotalView
Reference Guide for details.
You can use the Tools > Evaluate Dialog Box in many different ways. The
following are two examples:
� Expressions can contain loops, so you can use a for loop to search an
array of structures for an element set to a certain value. In this case, you
use the loop index at which the value is found as the last expression in
the expression field.
� Because you can call subroutines, you can test and debug a single routine
in your program without building a test program to call it.
Although the CLI does not have an evaluate command, the information in the following
sections does apply to the expression argument of the dbreak, dbarrier, dprint, and
dwatch commands.
To evaluate an expression: Display the Evaluate Dialog Box by selecting the
Tools > Evaluate command.
An Evaluate Dialog Box appears. If your program hasn’t yet been created,
you won’t be able to use any of the program’s variables or call any of its
functions.
1 Select a button for the programming language you’re writing the expression
in (if it isn’t already selected).
2 Move to the Expression field and enter a code fragment. For a description
of the supported language constructs, see “Using Built-in Variables and
Statements” on page 394.
The following figure shows a sample expression. The last statement in this
example assigns the value of my_var1-3 back to my_var1. Because this is
the last statement in the code fragment, the value placed in the Result
field is the same as if you had just typed my_var1-3. (See Figure 242 on
page 390.)
3 Click the Evaluate button.
If TotalView finds an error, it places the cursor on the incorrect line and
displays an error message. Otherwise, it interprets (or on some platforms,
compiles and executes) the code, and displays the value of the last
expression in the Result field.
While the code is being executed, you can’t modify anything in the dialog
box. TotalView might also display a message box that tells you that it is
waiting for the command to complete. (See Figure 243 on page 390.)
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