TotalView Users Guide - CI Wiki

Changing a Variable’s Data Type
Viewing Pointers to Arrays
Suppose you declared a variable vbl as a pointer to an array of 23 pointers
to an array of 12 objects of type mytype_t. The C language declaration for
this is:
mytype_t (*(*vbl)[23]) [12];
Here is how you would cast the vbl variable to this type:
(mytype_t (*(*)[23])[12])vbl
The TotalView cast for vbl is:
mytype_t[12]*[23]*
Viewing Arrays
When you specify an array, you can include a lower and upper bound separated
by a colon (:).
See Chapter 15, “Examining Arrays,” on page 333 for more information on arrays.
By default, the lower bound for a C or C++ array is 0, and the lower bound
for a Fortran array is 1. In the following example, an array of ten integers is
declared in C and then in Fortran:
int a[10];
integer a(10)
The elements of the array range from a[0] to a[9] in C, while the elements of
the equivalent Fortran array range from a(1) to a(10).
TotalView also lets you cast a variable to an array. In the GUI, just add an
array specifier to the Type declaration. For example, adding (3) to a variable
declared as an integer changes it to an array of three integers.
When the lower bound for an array dimension is the default for the language,
TotalView displays only the extent (that is, the number of elements
in the dimension). Consider the following Fortran array declaration:
integer a(1:7,1:8)
Since both dimensions of this Fortran array use the default lower bound,
which is 1, TotalView displays the data type of the array by using only the
extent of each dimension, as follows:
integer(7,8)
If an array declaration doesn’t use the default lower bound, TotalView displays
both the lower bound and upper bound for each dimension of the
array. For example, in Fortran, you declare an array of integers with the first
dimension ranging from –1 to 5 and the second dimension ranging from 2
to 10, as follows:
integer a(-1:5,2:10)
TotalView displays this the same way.
314 Chapter 14: Examining and Changing Data