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9.2 Displaying the language
The following commands help you find out which language is the working language,
and also what language source files were written in.
show language
Display the current working language. This is the language you
can use with commands such as print to build and compute
expressions that may involve variables in your program.
info frame
Display the source language for this frame. This language becomes
the working language if you use an identifier from this frame.
See “Information about a frame” (page 74), to identify the other
information listed here.
info source
Display the source language of this source file. Refer to See
Chapter 10 (page 115), to identify the other information listed here.
In unusual circumstances, you may have source files with extensions not in the standard
list. You can then set the extension associated with a language explicitly:
set extension-language .ext
language
Set source files with extension .ext to be
assumed to be in the source language language.
However, this is not valid on Unix systems.
info extensions
List all the filename extensions and the associated
languages. Not valid on Unix systems.
9.3 Type and range checking
Some languages are designed to guard you against making seemingly common errors
through a series of compile and run-time checks. These include checking the type of
arguments to functions and operators, and making sure mathematical overflows are
caught at run time. Checks such as these help to ensure the correctness of the program
once it has been compiled by eliminating type mismatches, and providing active checks
for range errors when your program is running.
GDB can check for conditions like the above if you wish. Although GDB does not check
the statements in your program, it can check expressions entered directly into GDB for
evaluation via the print command, for example. As with the working language, GDB
can also decide whether or not to check automatically based on your source language.
See “Supported languages” (page 105), for the default settings of supported languages.
9.3.1 An overview of type checking
Some languages are strongly typed, meaning that the arguments to operators and
functions have to be of the correct type, otherwise an error occurs. These checks prevent
type mismatch errors from causing run-time problems. For example,
1 + 2 3
but
9.2 Displaying the language 103