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399 lines
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399 lines
16 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Copyright (C) 1988-2019 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Free Software" and "Free Software Needs
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Free Documentation", with the Front-Cover Texts being "A GNU Manual,"
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and with the Back-Cover Texts as in (a) below.
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(a) The FSF's Back-Cover Text is: "You are free to copy and modify
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Symbols In Python (Debugging with GDB)</title>
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<meta name="description" content="Symbols In Python (Debugging with GDB)">
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<meta name="keywords" content="Symbols In Python (Debugging with GDB)">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Python-API.html#Python-API" rel="up" title="Python API">
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<link href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python" rel="next" title="Symbol Tables In Python">
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<link href="Blocks-In-Python.html#Blocks-In-Python" rel="prev" title="Blocks In Python">
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</head>
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<body lang="en">
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<a name="Symbols-In-Python"></a>
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<div class="header">
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<p>
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Next: <a href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python" accesskey="n" rel="next">Symbol Tables In Python</a>, Previous: <a href="Blocks-In-Python.html#Blocks-In-Python" accesskey="p" rel="prev">Blocks In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Python-representation-of-Symbols"></a>
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<h4 class="subsubsection">23.2.2.27 Python representation of Symbols</h4>
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<a name="index-symbols-in-python"></a>
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<a name="index-gdb_002eSymbol"></a>
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<p><small>GDB</small> represents every variable, function and type as an
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entry in a symbol table. See <a href="Symbols.html#Symbols">Examining the Symbol Table</a>.
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Similarly, Python represents these symbols in <small>GDB</small> with the
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<code>gdb.Symbol</code> object.
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</p>
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<p>The following symbol-related functions are available in the <code>gdb</code>
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module:
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</p>
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<a name="index-gdb_002elookup_005fsymbol"></a>
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<dl>
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<dt><a name="index-gdb_002elookup_005fsymbol-1"></a>Function: <strong>gdb.lookup_symbol</strong> <em>(name <span class="roman">[</span>, block <span class="roman">[</span>, domain<span class="roman">]]</span>)</em></dt>
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<dd><p>This function searches for a symbol by name. The search scope can be
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restricted to the parameters defined in the optional domain and block
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arguments.
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</p>
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<p><var>name</var> is the name of the symbol. It must be a string. The
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optional <var>block</var> argument restricts the search to symbols visible
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in that <var>block</var>. The <var>block</var> argument must be a
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<code>gdb.Block</code> object. If omitted, the block for the current frame
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is used. The optional <var>domain</var> argument restricts
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the search to the domain type. The <var>domain</var> argument must be a
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domain constant defined in the <code>gdb</code> module and described later
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in this chapter.
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</p>
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<p>The result is a tuple of two elements.
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The first element is a <code>gdb.Symbol</code> object or <code>None</code> if the symbol
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is not found.
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If the symbol is found, the second element is <code>True</code> if the symbol
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is a field of a method’s object (e.g., <code>this</code> in C<tt>++</tt>),
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otherwise it is <code>False</code>.
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If the symbol is not found, the second element is <code>False</code>.
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</p></dd></dl>
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<a name="index-gdb_002elookup_005fglobal_005fsymbol"></a>
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<dl>
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<dt><a name="index-gdb_002elookup_005fglobal_005fsymbol-1"></a>Function: <strong>gdb.lookup_global_symbol</strong> <em>(name <span class="roman">[</span>, domain<span class="roman">]</span>)</em></dt>
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<dd><p>This function searches for a global symbol by name.
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The search scope can be restricted to by the domain argument.
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</p>
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<p><var>name</var> is the name of the symbol. It must be a string.
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The optional <var>domain</var> argument restricts the search to the domain type.
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The <var>domain</var> argument must be a domain constant defined in the <code>gdb</code>
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module and described later in this chapter.
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</p>
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<p>The result is a <code>gdb.Symbol</code> object or <code>None</code> if the symbol
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is not found.
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</p></dd></dl>
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<p>A <code>gdb.Symbol</code> object has the following attributes:
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</p>
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<dl>
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<dt><a name="index-Symbol_002etype"></a>Variable: <strong>Symbol.type</strong></dt>
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<dd><p>The type of the symbol or <code>None</code> if no type is recorded.
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This attribute is represented as a <code>gdb.Type</code> object.
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See <a href="Types-In-Python.html#Types-In-Python">Types In Python</a>. This attribute is not writable.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002esymtab"></a>Variable: <strong>Symbol.symtab</strong></dt>
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<dd><p>The symbol table in which the symbol appears. This attribute is
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represented as a <code>gdb.Symtab</code> object. See <a href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python">Symbol Tables In Python</a>. This attribute is not writable.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002eline"></a>Variable: <strong>Symbol.line</strong></dt>
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<dd><p>The line number in the source code at which the symbol was defined.
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This is an integer.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002ename"></a>Variable: <strong>Symbol.name</strong></dt>
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<dd><p>The name of the symbol as a string. This attribute is not writable.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002elinkage_005fname"></a>Variable: <strong>Symbol.linkage_name</strong></dt>
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<dd><p>The name of the symbol, as used by the linker (i.e., may be mangled).
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This attribute is not writable.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002eprint_005fname"></a>Variable: <strong>Symbol.print_name</strong></dt>
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<dd><p>The name of the symbol in a form suitable for output. This is either
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<code>name</code> or <code>linkage_name</code>, depending on whether the user
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asked <small>GDB</small> to display demangled or mangled names.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002eaddr_005fclass"></a>Variable: <strong>Symbol.addr_class</strong></dt>
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<dd><p>The address class of the symbol. This classifies how to find the value
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of a symbol. Each address class is a constant defined in the
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<code>gdb</code> module and described later in this chapter.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002eneeds_005fframe"></a>Variable: <strong>Symbol.needs_frame</strong></dt>
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<dd><p>This is <code>True</code> if evaluating this symbol’s value requires a frame
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(see <a href="Frames-In-Python.html#Frames-In-Python">Frames In Python</a>) and <code>False</code> otherwise. Typically,
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local variables will require a frame, but other symbols will not.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002eis_005fargument"></a>Variable: <strong>Symbol.is_argument</strong></dt>
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<dd><p><code>True</code> if the symbol is an argument of a function.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002eis_005fconstant"></a>Variable: <strong>Symbol.is_constant</strong></dt>
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<dd><p><code>True</code> if the symbol is a constant.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002eis_005ffunction"></a>Variable: <strong>Symbol.is_function</strong></dt>
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<dd><p><code>True</code> if the symbol is a function or a method.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002eis_005fvariable"></a>Variable: <strong>Symbol.is_variable</strong></dt>
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<dd><p><code>True</code> if the symbol is a variable.
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</p></dd></dl>
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<p>A <code>gdb.Symbol</code> object has the following methods:
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</p>
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<dl>
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<dt><a name="index-Symbol_002eis_005fvalid"></a>Function: <strong>Symbol.is_valid</strong> <em>()</em></dt>
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<dd><p>Returns <code>True</code> if the <code>gdb.Symbol</code> object is valid,
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<code>False</code> if not. A <code>gdb.Symbol</code> object can become invalid if
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the symbol it refers to does not exist in <small>GDB</small> any longer.
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All other <code>gdb.Symbol</code> methods will throw an exception if it is
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invalid at the time the method is called.
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</p></dd></dl>
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<dl>
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<dt><a name="index-Symbol_002evalue"></a>Function: <strong>Symbol.value</strong> <em>(<span class="roman">[</span>frame<span class="roman">]</span>)</em></dt>
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<dd><p>Compute the value of the symbol, as a <code>gdb.Value</code>. For
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functions, this computes the address of the function, cast to the
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appropriate type. If the symbol requires a frame in order to compute
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its value, then <var>frame</var> must be given. If <var>frame</var> is not
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given, or if <var>frame</var> is invalid, then this method will throw an
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exception.
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</p></dd></dl>
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<p>The available domain categories in <code>gdb.Symbol</code> are represented
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as constants in the <code>gdb</code> module:
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</p>
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<dl compact="compact">
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<dd><a name="index-SYMBOL_005fUNDEF_005fDOMAIN"></a>
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</dd>
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<dt><code>gdb.SYMBOL_UNDEF_DOMAIN</code>
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<a name="index-gdb_002eSYMBOL_005fUNDEF_005fDOMAIN"></a>
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</dt>
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<dd><p>This is used when a domain has not been discovered or none of the
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following domains apply. This usually indicates an error either
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in the symbol information or in <small>GDB</small>’s handling of symbols.
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</p>
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<a name="index-SYMBOL_005fVAR_005fDOMAIN"></a>
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</dd>
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<dt><code>gdb.SYMBOL_VAR_DOMAIN</code>
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<a name="index-gdb_002eSYMBOL_005fVAR_005fDOMAIN"></a>
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</dt>
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<dd><p>This domain contains variables, function names, typedef names and enum
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type values.
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</p>
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<a name="index-SYMBOL_005fSTRUCT_005fDOMAIN"></a>
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</dd>
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<dt><code>gdb.SYMBOL_STRUCT_DOMAIN</code>
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<a name="index-gdb_002eSYMBOL_005fSTRUCT_005fDOMAIN"></a>
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</dt>
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<dd><p>This domain holds struct, union and enum type names.
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</p>
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<a name="index-SYMBOL_005fLABEL_005fDOMAIN"></a>
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</dd>
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<dt><code>gdb.SYMBOL_LABEL_DOMAIN</code>
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<a name="index-gdb_002eSYMBOL_005fLABEL_005fDOMAIN"></a>
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</dt>
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<dd><p>This domain contains names of labels (for gotos).
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</p>
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<a name="index-SYMBOL_005fMODULE_005fDOMAIN"></a>
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</dd>
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<dt><code>gdb.SYMBOL_MODULE_DOMAIN</code>
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<a name="index-gdb_002eSYMBOL_005fMODULE_005fDOMAIN"></a>
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</dt>
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<dd><p>This domain contains names of Fortran module types.
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</p>
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<a name="index-SYMBOL_005fCOMMON_005fBLOCK_005fDOMAIN"></a>
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</dd>
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<dt><code>gdb.SYMBOL_COMMON_BLOCK_DOMAIN</code>
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<a name="index-gdb_002eSYMBOL_005fCOMMON_005fBLOCK_005fDOMAIN"></a>
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</dt>
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<dd><p>This domain contains names of Fortran common blocks.
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</p></dd>
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</dl>
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<p>The available address class categories in <code>gdb.Symbol</code> are represented
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as constants in the <code>gdb</code> module:
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</p>
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<dl compact="compact">
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<dd><a name="index-SYMBOL_005fLOC_005fUNDEF"></a>
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</dd>
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<dt><code>gdb.SYMBOL_LOC_UNDEF</code>
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<a name="index-gdb_002eSYMBOL_005fLOC_005fUNDEF"></a>
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</dt>
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<dd><p>If this is returned by address class, it indicates an error either in
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the symbol information or in <small>GDB</small>’s handling of symbols.
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</p>
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<a name="index-SYMBOL_005fLOC_005fCONST"></a>
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</dd>
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<dt><code>gdb.SYMBOL_LOC_CONST</code>
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<a name="index-gdb_002eSYMBOL_005fLOC_005fCONST"></a>
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</dt>
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<dd><p>Value is constant int.
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</p>
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<a name="index-SYMBOL_005fLOC_005fSTATIC"></a>
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</dd>
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<dt><code>gdb.SYMBOL_LOC_STATIC</code>
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<a name="index-gdb_002eSYMBOL_005fLOC_005fSTATIC"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value is at a fixed address.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fREGISTER"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_REGISTER</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fREGISTER"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value is in a register.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fARG"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_ARG</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fARG"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value is an argument. This value is at the offset stored within the
|
||
|
|
symbol inside the frame’s argument list.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fREF_005fARG"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_REF_ARG</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fREF_005fARG"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value address is stored in the frame’s argument list. Just like
|
||
|
|
<code>LOC_ARG</code> except that the value’s address is stored at the
|
||
|
|
offset, not the value itself.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fREGPARM_005fADDR"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_REGPARM_ADDR</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fREGPARM_005fADDR"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value is a specified register. Just like <code>LOC_REGISTER</code> except
|
||
|
|
the register holds the address of the argument instead of the argument
|
||
|
|
itself.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fLOCAL"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_LOCAL</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fLOCAL"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value is a local variable.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fTYPEDEF"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_TYPEDEF</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fTYPEDEF"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value not used. Symbols in the domain <code>SYMBOL_STRUCT_DOMAIN</code> all
|
||
|
|
have this class.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fBLOCK"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_BLOCK</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fBLOCK"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value is a block.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fCONST_005fBYTES"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_CONST_BYTES</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fCONST_005fBYTES"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value is a byte-sequence.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fUNRESOLVED"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_UNRESOLVED</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fUNRESOLVED"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>Value is at a fixed address, but the address of the variable has to be
|
||
|
|
determined from the minimal symbol table whenever the variable is
|
||
|
|
referenced.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fOPTIMIZED_005fOUT"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_OPTIMIZED_OUT</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fOPTIMIZED_005fOUT"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>The value does not actually exist in the program.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fCOMPUTED"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_COMPUTED</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fCOMPUTED"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>The value’s address is a computed location.
|
||
|
|
</p>
|
||
|
|
<a name="index-SYMBOL_005fLOC_005fCOMPUTED-1"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><code>gdb.SYMBOL_LOC_COMPUTED</code>
|
||
|
|
<a name="index-gdb_002eSYMBOL_005fLOC_005fCOMPUTED-1"></a>
|
||
|
|
</dt>
|
||
|
|
<dd><p>The value’s address is a symbol. This is only used for Fortran common
|
||
|
|
blocks.
|
||
|
|
</p></dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Symbol-Tables-In-Python.html#Symbol-Tables-In-Python" accesskey="n" rel="next">Symbol Tables In Python</a>, Previous: <a href="Blocks-In-Python.html#Blocks-In-Python" accesskey="p" rel="prev">Blocks In Python</a>, Up: <a href="Python-API.html#Python-API" accesskey="u" rel="up">Python API</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|