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<title>Untitled Document: typedef asymbol</title>
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<a name="typedef-asymbol"></a>
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<div class="header">
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<p>
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Next: <a href="symbol-handling-functions.html#symbol-handling-functions" accesskey="n" rel="next">symbol handling functions</a>, Previous: <a href="Mini-Symbols.html#Mini-Symbols" accesskey="p" rel="prev">Mini Symbols</a>, Up: <a href="Symbols.html#Symbols" accesskey="u" rel="up">Symbols</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="typedef-asymbol-1"></a>
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<h4 class="subsection">2.7.4 typedef asymbol</h4>
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<p>An <code>asymbol</code> has the form:
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</p>
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<div class="example">
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<pre class="example">
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typedef struct bfd_symbol
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{
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/* A pointer to the BFD which owns the symbol. This information
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is necessary so that a back end can work out what additional
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information (invisible to the application writer) is carried
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with the symbol.
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This field is *almost* redundant, since you can use section->owner
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instead, except that some symbols point to the global sections
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bfd_{abs,com,und}_section. This could be fixed by making
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these globals be per-bfd (or per-target-flavor). FIXME. */
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struct bfd *the_bfd; /* Use bfd_asymbol_bfd(sym) to access this field. */
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/* The text of the symbol. The name is left alone, and not copied; the
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application may not alter it. */
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const char *name;
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/* The value of the symbol. This really should be a union of a
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numeric value with a pointer, since some flags indicate that
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a pointer to another symbol is stored here. */
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symvalue value;
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/* Attributes of a symbol. */
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#define BSF_NO_FLAGS 0x00
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/* The symbol has local scope; <code>static</code> in <code>C</code>. The value
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is the offset into the section of the data. */
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#define BSF_LOCAL (1 << 0)
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/* The symbol has global scope; initialized data in <code>C</code>. The
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value is the offset into the section of the data. */
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#define BSF_GLOBAL (1 << 1)
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/* The symbol has global scope and is exported. The value is
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the offset into the section of the data. */
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#define BSF_EXPORT BSF_GLOBAL /* No real difference. */
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/* A normal C symbol would be one of:
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<code>BSF_LOCAL</code>, <code>BSF_UNDEFINED</code> or <code>BSF_GLOBAL</code>. */
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/* The symbol is a debugging record. The value has an arbitrary
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meaning, unless BSF_DEBUGGING_RELOC is also set. */
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#define BSF_DEBUGGING (1 << 2)
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/* The symbol denotes a function entry point. Used in ELF,
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perhaps others someday. */
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#define BSF_FUNCTION (1 << 3)
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/* Used by the linker. */
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#define BSF_KEEP (1 << 5)
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/* An ELF common symbol. */
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#define BSF_ELF_COMMON (1 << 6)
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/* A weak global symbol, overridable without warnings by
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a regular global symbol of the same name. */
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#define BSF_WEAK (1 << 7)
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/* This symbol was created to point to a section, e.g. ELF's
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STT_SECTION symbols. */
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#define BSF_SECTION_SYM (1 << 8)
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/* The symbol used to be a common symbol, but now it is
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allocated. */
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#define BSF_OLD_COMMON (1 << 9)
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/* In some files the type of a symbol sometimes alters its
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location in an output file - ie in coff a <code>ISFCN</code> symbol
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which is also <code>C_EXT</code> symbol appears where it was
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declared and not at the end of a section. This bit is set
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by the target BFD part to convey this information. */
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#define BSF_NOT_AT_END (1 << 10)
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/* Signal that the symbol is the label of constructor section. */
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#define BSF_CONSTRUCTOR (1 << 11)
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/* Signal that the symbol is a warning symbol. The name is a
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warning. The name of the next symbol is the one to warn about;
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if a reference is made to a symbol with the same name as the next
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symbol, a warning is issued by the linker. */
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#define BSF_WARNING (1 << 12)
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/* Signal that the symbol is indirect. This symbol is an indirect
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pointer to the symbol with the same name as the next symbol. */
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#define BSF_INDIRECT (1 << 13)
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/* BSF_FILE marks symbols that contain a file name. This is used
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for ELF STT_FILE symbols. */
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#define BSF_FILE (1 << 14)
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/* Symbol is from dynamic linking information. */
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#define BSF_DYNAMIC (1 << 15)
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/* The symbol denotes a data object. Used in ELF, and perhaps
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others someday. */
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#define BSF_OBJECT (1 << 16)
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/* This symbol is a debugging symbol. The value is the offset
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into the section of the data. BSF_DEBUGGING should be set
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as well. */
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#define BSF_DEBUGGING_RELOC (1 << 17)
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/* This symbol is thread local. Used in ELF. */
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#define BSF_THREAD_LOCAL (1 << 18)
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/* This symbol represents a complex relocation expression,
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with the expression tree serialized in the symbol name. */
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#define BSF_RELC (1 << 19)
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/* This symbol represents a signed complex relocation expression,
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with the expression tree serialized in the symbol name. */
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#define BSF_SRELC (1 << 20)
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/* This symbol was created by bfd_get_synthetic_symtab. */
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#define BSF_SYNTHETIC (1 << 21)
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/* This symbol is an indirect code object. Unrelated to BSF_INDIRECT.
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The dynamic linker will compute the value of this symbol by
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calling the function that it points to. BSF_FUNCTION must
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also be also set. */
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#define BSF_GNU_INDIRECT_FUNCTION (1 << 22)
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/* This symbol is a globally unique data object. The dynamic linker
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will make sure that in the entire process there is just one symbol
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with this name and type in use. BSF_OBJECT must also be set. */
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#define BSF_GNU_UNIQUE (1 << 23)
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flagword flags;
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/* A pointer to the section to which this symbol is
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relative. This will always be non NULL, there are special
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sections for undefined and absolute symbols. */
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struct bfd_section *section;
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/* Back end special data. */
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union
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{
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void *p;
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bfd_vma i;
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}
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udata;
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}
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asymbol;
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</pre></div>
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<p>
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Next: <a href="symbol-handling-functions.html#symbol-handling-functions" accesskey="n" rel="next">symbol handling functions</a>, Previous: <a href="Mini-Symbols.html#Mini-Symbols" accesskey="p" rel="prev">Mini Symbols</a>, Up: <a href="Symbols.html#Symbols" accesskey="u" rel="up">Symbols</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="BFD-Index.html#BFD-Index" title="Index" rel="index">Index</a>]</p>
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