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dwarf_get_fde_range(3) [freebsd man page]

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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DWARF_GET_FDE_LIST(3)					   BSD Library Functions Manual 				     DWARF_GET_FDE_LIST(3)

NAME
dwarf_get_fde_list -- retrieve frame information LIBRARY
DWARF Access Library (libdwarf, -ldwarf) SYNOPSIS
#include <libdwarf.h> int dwarf_get_fde_list(Dwarf_Debug dbg, Dwarf_Cie **cie_list, Dwarf_Signed *cie_count, Dwarf_Fde **fde_list, Dwarf_Signed *fde_count, Dwarf_Error *err); int dwarf_get_fde_list_eh(Dwarf_Debug dbg, Dwarf_Cie **cie_list, Dwarf_Signed *cie_count, Dwarf_Fde **fde_list, Dwarf_Signed *fde_count, Dwarf_Error *err); DESCRIPTION
These functions retrieve frame related information for the specified DWARF debug context. Function dwarf_get_fde_list() retrieves frame information from the DWARF section named ``.debug_frame''. For objects containing GNU style C++ exception handling information, the function dwarf_get_fde_list_eh() retrieves frame information from the section named ``.eh_frame''. Frame information is returned using opaque descriptors of type Dwarf_Cie and Dwarf_Fde. Applications need to use the other frame related functions in the DWARF(3) API set to retrieve the information contained in these descriptors. Argument dbg should reference a DWARF debug context allocated using dwarf_init(3). Argument cie_list should point to a location that will be set to a pointer to an array of Dwarf_Cie descriptors. Argument cie_count should point to a location that will be set to the number of Dwarf_Cie descriptors returned. Argument fde_list should point to a location that will be set to a pointer to an array of Dwarf_Fde descriptors. Argument fde_count should point to a location that will be set to the number of Dwarf_Fde descriptors returned. If argument err is not NULL, it will be used to store error information in case of an error. Memory Management The memory areas used for the arrays returned in arguments cie_list and fde_list are owned by the DWARF Access Library (libdwarf, -ldwarf). Application code should not attempt to directly free these areas. Portable applications should instead use the dwarf_fde_cie_list_dealloc(3) function to indicate that these memory areas may be freed. RETURN VALUES
On success, these functions returns DW_DLV_OK. They return DW_DLV_NO_ENTRY if there is no frame information associated with the given DWARF debug context. 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 dbg, cie_list, cie_count, fde_list or fde_count was NULL. [DW_DLE_NO_ENTRY] There is no frame information associated with the giving DWARF debug context. EXAMPLE
To obtain frame information from the ``.debug_frame'' section, use: Dwarf_Debug dbg; Dwarf_Cie *cie_list, cie; Dwarf_Fde *fde_list, fde; Dwarf_Off fde_offset, cie_offset; Dwarf_Unsigned func_len, fde_length, fde_instlen; Dwarf_Signed cie_count, fde_count, cie_index; Dwarf_Addr low_pc; Dwarf_Ptr fde_addr, fde_inst, cie_inst; Dwarf_Error de; int i; if (dwarf_get_fde_list(dbg, &cie_list, &cie_count, &fde_list, &fde_count, &de) != DW_DLV_OK) { errx(EXIT_FAILURE, "dwarf_get_fde_list failed: %s", dwarf_errmsg(de)); } for (i = 0; i < fde_count; i++) { if (dwarf_get_fde_n(fde_list, i, &fde, &de) != DW_DLV_OK) { warnx("dwarf_get_fde_n failed: %s", dwarf_errmsg(de)); continue; } if (dwarf_get_cie_of_fde(fde, &cie, &de) != DW_DLV_OK) { warnx("dwarf_get_fde_n failed: %s", dwarf_errmsg(de)); continue; } if (dwarf_get_fde_range(fde, &low_pc, &func_len, &fde_addr, &fde_length, &cie_offset, &cie_index, &fde_offset, &de) != DW_DLV_OK) { warnx("dwarf_get_fde_range failed: %s", dwarf_errmsg(de)); continue; } if (dwarf_get_fde_instr_bytes(fde, &fde_inst, &fde_instlen, &de) != DW_DLV_OK) { warnx("dwarf_get_fde_instr_bytes failed: %s", dwarf_errmsg(de)); continue; } /* ... Use the retrieved frame information ... */ } /* Indicate that the returned arrays may be freed. */ dwarf_fde_cie_list_dealloc(dbg, cie_list, cie_count, fde_list, fde_count); SEE ALSO
dwarf(3), dwarf_get_cie_index(3), dwarf_get_cie_of_fde(3), dwarf_get_fde_at_pc(3), dwarf_get_fde_instr_bytes(3), dwarf_get_fde_n(3), dwarf_get_fde_range(3), dwarf_fde_cie_list_dealloc(3), dwarf_set_frame_cfa_value(3), dwarf_set_frame_rule_table_size(3), dwarf_set_frame_rule_initial_value(3), dwarf_set_frame_same_value(3), dwarf_set_frame_undefined_value(3) BSD
November 9, 2011 BSD

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