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