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Top Forums Programming Parameter passing to function with void * as Argument Post 302902990 by Corona688 on Friday 23rd of May 2014 11:05:51 AM
Old 05-23-2014
Quote:
Originally Posted by rupeshkp728
I guess(may be I am wrong) the func call is incorrect.
Did you try the code or just consider it to look wrong...?
Quote:
We need to pass object of type S.
Why?

The whole point of using a union, and the whole point of adding type to the beginning of your CS and DS structures, was that they'd all have the same memory layout.

The compiler warns you since it doesn't know you built with these assumptions in mind. You can avoid the warning with a typecast if you want:

Code:
myfunc((S *)&obj);

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DWARF_GET_FDE_RANGE(3)					   BSD Library Functions Manual 				    DWARF_GET_FDE_RANGE(3)

NAME
dwarf_get_fde_range -- retrieve range information from an FDE descriptor LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> int dwarf_get_fde_range(Dwarf_Fde fde, Dwarf_Addr *low_pc, Dwarf_Unsigned *func_len, Dwarf_Ptr *fde_bytes, Dwarf_Unsigned *fde_byte_len, Dwarf_Off *cie_offset, Dwarf_Signed *cie_index, Dwarf_Off *fde_offset, Dwarf_Error *err); DESCRIPTION
Function dwarf_get_fde_range() retrieves range and offset information from a given FDE descriptor. Argument fde should reference a valid DWARF FDE descriptor. Argument low_pc should point to a location that will be set to the lowest program counter address covered by the FDE descriptor. Argument func_len should point to a location that will hold the length in bytes of the address range covered by the FDE descriptor. Argument fde_bytes should point to a location that will be set to a pointer to the content of the FDE descriptor itself. Argument fde_byte_len should point to a location that will hold the length in bytes of the FDE descriptor itself. Argument cie_offset should point to a location that will be set to the offset, relative to the DWARF ``.debug_frame'' section, of the CIE descriptor associated with the given FDE descriptor. Argument cie_index should point to a location that will hold the index of the CIE descriptor associated with the FDE descriptor. The returned value is a zero-based index into the array of CIE descriptors returned by a prior call to functions dwarf_get_fde_list(3) or dwarf_get_fde_list_eh(3). Argument fde_offset should point to a location that will be set to the offset, relative to the DWARF ``.debug_frame'' section, of the FDE descriptor. If argument err is not NULL, it will be used to store error information in case of an error. RETURN VALUES
Function dwarf_get_fde_range() returns DW_DLV_OK when it succeeds. In case of an error, it returns DW_DLV_ERROR and sets the argument err. ERRORS
Function dwarf_get_fde_range() can fail with: [DW_DLE_ARGUMENT] One of the arguments fde, low_pc, func_len, fde_bytes, fde_byte_len, cie_offset, cie_index or fde_offset was NULL. SEE ALSO
dwarf(3), dwarf_get_cie_info(3), dwarf_get_cie_index(3), dwarf_get_cie_of_fde, dwarf_get_fde_at_pc(3), dwarf_get_fde_info_for_all_regs(3), dwarf_get_fde_info_for_all_regs3(3), dwarf_get_fde_info_for_cfa_reg3(3), dwarf_get_fde_info_for_reg(3), dwarf_get_fde_info_for_reg3(3), dwarf_get_fde_instr_bytes(3), dwarf_get_fde_list(3), dwarf_get_fde_list_eh(3), dwarf_get_fde_n(3) BSD
May 22, 2011 BSD
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