DWARF_GET_FUNCS(3)

DWARF_GET_FUNCS(3) | Library Functions Manual | DWARF_GET_FUNCS(3)

# NAME

`dwarf_get_funcs`, `dwarf_func_cu_offset`, `dwarf_func_die_offset`, `dwarf_func_name_offsets`, `dwarf_funcname` —
retrieve information about static functions

# LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

# SYNOPSIS

`#include <libdwarf.h>`

int
`dwarf_get_funcs`(Dwarf_Debug dbg, Dwarf_Func **funcs, Dwarf_Signed *nfuncs, Dwarf_Error *err);

int
`dwarf_func_cu_offset`(Dwarf_Func func, Dwarf_Off *cu_offset, Dwarf_Error *err);

int
`dwarf_func_die_offset`(Dwarf_Func func, Dwarf_Off *die_offset, Dwarf_Error *err);

int
`dwarf_func_name_offsets`(Dwarf_Func func, char **name, Dwarf_Off *die_offset, Dwarf_Off *cu_die_offset, Dwarf_Error *err);

int
`dwarf_funcname`(Dwarf_Func func, char **name, Dwarf_Error *err);

# DESCRIPTION

These functions retrieve information about static functions from the lookup tables in the (SGI-specific) “.debug_funcnames” section. Information about these functions is returned using opaque descriptors of type Dwarf_Func. Applications need to use the functions described below to retrieve the name and offset information contained in these descriptors.

Function `dwarf_get_funcs`() retrieves descriptors for all the static functions associated with the DWARF debug context specified by argument dbg. The argument funcs should point to a location that will be set to a pointer to an array of Dwarf_Func descriptors. The argument nfuncs should point to a location that will be set to the number of descriptors returned.

Function `dwarf_func_cu_offset`() returns the offset, relative to the “.debug_info” section, of the compilation unit that contains the debugging information entry associated with the argument func. Argument cu_offset should point to a location that will hold the returned offset.

Function `dwarf_func_die_offset`() retrieves the offset, relative to the “.debug_info” section, of the debugging information entry associated with the argument func, and stores it into the location pointed to by the argument die_offset.

Function `dwarf_func_name_offsets`() retrieves the name and offsets for the debugging information entry for argument func. Argument name should point to a location which will be set to a pointer to a NUL-terminated string containing the name of the associated debugging information entry. Argument die_offset should point to a location which will be set to the offset, relative to the “.debug_info” section, of the associated debugging information entry. Argument cu_die_offset should point to a location which will be set to the offset, relative to the “.debug_info” section, of the first debugging information entry in the compilation unit associated with argument func.

Function `dwarf_funcname`() sets the location pointed to by argument name to a pointer to a NUL-terminated string holding the name of the debugging information entry associated with the argument func.

## Memory Management

The memory area used for the array of Dwarf_Func descriptors returned in argument funcs by function `dwarf_get_funcs`() is owned by the DWARF Access Library (libdwarf, -ldwarf). Application code should not attempt to directly free this pointer. Portable code should instead use the function dwarf_funcs_dealloc(3) to indicate that the memory area may be freed.

The memory area used for the string returned in the name argument to functions `dwarf_func_name_offsets`() and `dwarf_funcname`() is owned by the DWARF Access Library (libdwarf, -ldwarf). Portable code should indicate that the memory area can be freed using the dwarf_dealloc(3) function.

## Error Returns

If argument err is not NULL, these functions will use it to store error information, in case of an error.

# RETURN VALUES

On success, these functions returns `DW_DLV_OK`. In case of an error, they return `DW_DLV_ERROR` and set the argument err.

# ERRORS

These functions may fail with the following errors:

[`DW_DLE_ARGUMENT`]
  One of the arguments cu_die_offset, cu_offset, dbg, die_offset, func, funcs, name, or nfuncs was NULL.
[`DW_DLE_NO_ENTRY`]
  The DWARF debugging context referenced by argument dbg did not contain information about static functions.

# SEE ALSO

dwarf(3), dwarf_get_cu_die_offset_given_cu_header_offset(3), dwarf_funcs_dealloc(3)

April 10, 2011 | NetBSD 9.5