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| <h4 class="subsection">9.2.3 Address Locations</h4> |
| |
| <p><a name="index-address-locations-566"></a> |
| <dfn>Address locations</dfn> indicate a specific program address. They have |
| the generalized form *<var>address</var>. |
| |
| <p>For line-oriented commands, such as <code>list</code> and <code>edit</code>, this |
| specifies a source line that contains <var>address</var>. For <code>break</code> and |
| other breakpoint-oriented commands, this can be used to set breakpoints in |
| parts of your program which do not have debugging information or |
| source files. |
| |
| <p>Here <var>address</var> may be any expression valid in the current working |
| language (see <a href="Languages.html#Languages">working language</a>) that specifies a code |
| address. In addition, as a convenience, <span class="sc">gdb</span> extends the |
| semantics of expressions used in locations to cover several situations |
| that frequently occur during debugging. Here are the various forms |
| of <var>address</var>: |
| |
| <dl> |
| <dt><var>expression</var><dd>Any expression valid in the current working language. |
| |
| <br><dt><var>funcaddr</var><dd>An address of a function or procedure derived from its name. In C, |
| C<tt>++</tt>, Objective-C, Fortran, minimal, and assembly, this is |
| simply the function's name <var>function</var> (and actually a special case |
| of a valid expression). In Pascal and Modula-2, this is |
| <code>&</code><var>function</var>. In Ada, this is <var>function</var><code>'Address</code> |
| (although the Pascal form also works). |
| |
| <p>This form specifies the address of the function's first instruction, |
| before the stack frame and arguments have been set up. |
| |
| <br><dt><code>'</code><var>filename</var><code>':</code><var>funcaddr</var><dd>Like <var>funcaddr</var> above, but also specifies the name of the source |
| file explicitly. This is useful if the name of the function does not |
| specify the function unambiguously, e.g., if there are several |
| functions with identical names in different source files. |
| </dl> |
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