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dwarf_attrlist(3) [freebsd man page]

DWARF_ATTRLIST(3)					   BSD Library Functions Manual 					 DWARF_ATTRLIST(3)

dwarf_attrlist -- retrieve DWARF attribute descriptors LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> int dwarf_attrlist(Dwarf_Die die, Dwarf_Attribute **attrbuf, Dwarf_Signed *attrcount, Dwarf_Error *err); DESCRIPTION
Function dwarf_attrlist() retrieves the DWARF attribute descriptors associated with a debugging information entry descriptor in argument die. The descriptors are returned as an array of values of the opaque type Dwarf_Attribute. The data associated with each returned attribute descriptor may be queried using the form query functions in the dwarf(3) API set. Argument attrbuf points to a location that will hold a pointer to the returned array of DWARF attribute descriptors. Argument attrcount points to a location that will hold the number of descriptors in the returned array. If argument err is non-NULL, it is used to return an error descriptor in case of an error. Memory Management In the current implementation, the memory allocated for each DWARF attribute descriptor and for the returned array of descriptors is managed by the library and the application does not need to explicitly free the returned pointers. However, for compatibility with other implementa- tions of the dwarf(3) API, the application is permitted to pass the pointers returned by to the dwarf_dealloc() function. RETURN VALUES
Function dwarf_attrlist() returns DW_DLV_OK on success. If the debugging information entry descriptor denoted by argument die does not contain any attribute, the function returns DW_DLV_NO_ENTRY and sets argument err. For other errors, it returns DW_DLV_ERROR and sets argument err. EXAMPLES
To retrieve the attribute list for a DWARF debugging information entry use: Dwarf_Die dw_die; Dwarf_Error dw_e; Dwarf_Unsigned dw_count; Dwarf_Attribute *dw_attributes; int error, i; ... variable dw_die contains a reference to the DIE of interest ... /* Retrieve the attribute list from the DIE. */ if ((error = dwarf_attrlist(dw_die, &dw_attributes, &dw_count, &dw_e)) != DW_DLV_OK) errx(EXIT_FAILURE, "dwarf_attrlist: %s", dwarf_errmsg(dw_e)); /* Process the attribute list. */ for (i = 0; i < dw_count; ++i) { /* Use the returned pointers in dw_attributes[i] here. */ } ERRORS
Function dwarf_diename() can fail with the following errors: [DW_DLE_ARGUMENT] Arguments die, attrbuf, or attrcount were NULL. [DW_DLE_NO_ENTRY] Argument die had no attributes. [DW_DLE_MEMORY] An out of memory condition was encountered during the execution of the function. SEE ALSO
dwarf(3), dwarf_attr(3), dwarf_dealloc(3), dwarf_hasattr(3), dwarf_hasform(3), dwarf_whatattr(3), dwarf_whatform(3) BSD
November 9, 2011 BSD

Check Out this Related Man Page

DWARF_HIGHPC(3) 					   BSD Library Functions Manual 					   DWARF_HIGHPC(3)

dwarf_arrayorder, dwarf_bitoffset, dwarf_bitsize, dwarf_bytesize, dwarf_highpc, dwarf_highpc_b, dwarf_lowpc, dwarf_srclang -- retrieve the value of a DWARF attribute LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> int dwarf_arrayorder(Dwarf_Die die, Dwarf_Unsigned *ret_order, Dwarf_Error *err); int dwarf_bitoffset(Dwarf_Die die, Dwarf_Unsigned *ret_size, Dwarf_Error *err); int dwarf_bitsize(Dwarf_Die die, Dwarf_Unsigned *ret_size, Dwarf_Error *err); int dwarf_bytesize(Dwarf_Die die, Dwarf_Unsigned *ret_size, Dwarf_Error *err); int dwarf_highpc(Dwarf_Die die, Dwarf_Addr *ret_highpc, Dwarf_Error *err); int dwarf_highpc_b(Dwarf_Die die, Dwarf_Addr *ret_highpc, Dwarf_Half *ret_form, enum Dwarf_Form_Class *ret_class, Dwarf_Error *err); int dwarf_lowpc(Dwarf_Die die, Dwarf_Addr *ret_lowpc, Dwarf_Error *err); int dwarf_srclang(Dwarf_Die die, Dwarf_Unsigned *ret_lang, Dwarf_Error *err); DESCRIPTION
These convenience functions are used to retrieve DWARF attribute values associated with a Debugging Information Entry (DIE) descriptor denoted by argument die. These functions store the value of the requested attribute into the location pointed to by their second argument, provided that the requested attribute exists in the debugging information entry. The list of functions and the DWARF attribute that they retrieve are: dwarf_arrayorder() Retrieve the DW_AT_ordering attribute value. dwarf_bitoffset() Retrieve the DW_AT_bit_offset attribute value. dwarf_bitsize() Retrieve the DW_AT_bit_size attribute value. dwarf_bytesize() Retrieve the DW_AT_byte_size attribute value. dwarf_highpc() Retrieve the DW_AT_high_pc attribute value. dwarf_highpc_b() Retrieve the DW_AT_high_pc attribute value. dwarf_lowpc() Retrieve the DW_AT_low_pc attribute value. dwarf_srclang() Retrieve the DW_AT_language attribute value. Function dwarf_highpc_b() is an enhanced version of function dwarf_highpc(). It sets the location specified by argument ret_form to the form code of the attribute DW_AT_high_pc, and sets the location specified by argument ret_class to the class of that form. A value of NULL may be used for either of the arguments ret_form or ret_class if the caller is not interested in the respective value. RETURN VALUES
These functions return DW_DLV_OK on success. If the debugging information entry descriptor denoted by argument die does not contain the requested attribute, these functions return DW_DLV_NO_ENTRY and set argument err. For other errors, they return DW_DLV_ERROR and set argument err. ERRORS
These functions can fail with the following errors: [DW_DLE_ARGUMENT] Arguments die, ret_highpc, ret_lowpc, ret_size, ret_lang or ret_order were NULL. [DW_DLE_NO_ENTRY] Argument die had no requested attribute. SEE ALSO
dwarf(3), dwarf_attr(3), dwarf_attrlist(3), dwarf_hasattr(3), dwarf_get_form_class(3) BSD
July 22, 2014 BSD
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