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| <title>Debugging with GDB: Symbol Errors</title> |
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| <a name="Symbol-Errors"></a> |
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| <a name="Errors-Reading-Symbol-Files"></a> |
| <h3 class="section">18.5 Errors Reading Symbol Files</h3> |
| |
| <p>While reading a symbol file, <small>GDB</small> occasionally encounters problems, |
| such as symbol types it does not recognize, or known bugs in compiler |
| output. By default, <small>GDB</small> does not notify you of such problems, since |
| they are relatively common and primarily of interest to people |
| debugging compilers. If you are interested in seeing information |
| about ill-constructed symbol tables, you can either ask <small>GDB</small> to print |
| only one message about each such type of problem, no matter how many |
| times the problem occurs; or you can ask <small>GDB</small> to print more messages, |
| to see how many times the problems occur, with the <code>set |
| complaints</code> command (see <a href="Messages_002fWarnings.html#Messages_002fWarnings">Optional Warnings and |
| Messages</a>). |
| </p> |
| <p>The messages currently printed, and their meanings, include: |
| </p> |
| <dl compact="compact"> |
| <dt><code>inner block not inside outer block in <var>symbol</var></code></dt> |
| <dd> |
| <p>The symbol information shows where symbol scopes begin and end |
| (such as at the start of a function or a block of statements). This |
| error indicates that an inner scope block is not fully contained |
| in its outer scope blocks. |
| </p> |
| <p><small>GDB</small> circumvents the problem by treating the inner block as if it had |
| the same scope as the outer block. In the error message, <var>symbol</var> |
| may be shown as “<code>(don't know)</code>” if the outer block is not a |
| function. |
| </p> |
| </dd> |
| <dt><code>block at <var>address</var> out of order</code></dt> |
| <dd> |
| <p>The symbol information for symbol scope blocks should occur in |
| order of increasing addresses. This error indicates that it does not |
| do so. |
| </p> |
| <p><small>GDB</small> does not circumvent this problem, and has trouble |
| locating symbols in the source file whose symbols it is reading. (You |
| can often determine what source file is affected by specifying |
| <code>set verbose on</code>. See <a href="Messages_002fWarnings.html#Messages_002fWarnings">Optional Warnings and |
| Messages</a>.) |
| </p> |
| </dd> |
| <dt><code>bad block start address patched</code></dt> |
| <dd> |
| <p>The symbol information for a symbol scope block has a start address |
| smaller than the address of the preceding source line. This is known |
| to occur in the SunOS 4.1.1 (and earlier) C compiler. |
| </p> |
| <p><small>GDB</small> circumvents the problem by treating the symbol scope block as |
| starting on the previous source line. |
| </p> |
| </dd> |
| <dt><code>bad string table offset in symbol <var>n</var></code></dt> |
| <dd> |
| <a name="index-foo"></a> |
| <p>Symbol number <var>n</var> contains a pointer into the string table which is |
| larger than the size of the string table. |
| </p> |
| <p><small>GDB</small> circumvents the problem by considering the symbol to have the |
| name <code>foo</code>, which may cause other problems if many symbols end up |
| with this name. |
| </p> |
| </dd> |
| <dt><code>unknown symbol type <code>0x<var>nn</var></code></code></dt> |
| <dd> |
| <p>The symbol information contains new data types that <small>GDB</small> does |
| not yet know how to read. <code>0x<var>nn</var></code> is the symbol type of the |
| uncomprehended information, in hexadecimal. |
| </p> |
| <p><small>GDB</small> circumvents the error by ignoring this symbol information. |
| This usually allows you to debug your program, though certain symbols |
| are not accessible. If you encounter such a problem and feel like |
| debugging it, you can debug <code>gdb</code> with itself, breakpoint |
| on <code>complain</code>, then go up to the function <code>read_dbx_symtab</code> |
| and examine <code>*bufp</code> to see the symbol. |
| </p> |
| </dd> |
| <dt><code>stub type has NULL name</code></dt> |
| <dd> |
| <p><small>GDB</small> could not find the full definition for a struct or class. |
| </p> |
| </dd> |
| <dt><code>const/volatile indicator missing (ok if using g++ v1.x), got…</code></dt> |
| <dd><p>The symbol information for a C<tt>++</tt> member function is missing some |
| information that recent versions of the compiler should have output for |
| it. |
| </p> |
| </dd> |
| <dt><code>info mismatch between compiler and debugger</code></dt> |
| <dd> |
| <p><small>GDB</small> could not parse a type specification output by the compiler. |
| </p> |
| </dd> |
| </dl> |
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