1 .\" Copyright (c) 2011 Kai Wang
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25 .\" $Id: dwarf_get_fde_list.3 2122 2011-11-09 15:35:14Z jkoshy $
29 .Dt DWARF_GET_FDE_LIST 3
31 .Nm dwarf_get_fde_list
32 .Nd retrieve frame information
38 .Fo dwarf_get_fde_list
40 .Fa "Dwarf_Cie **cie_list"
41 .Fa "Dwarf_Signed *cie_count"
42 .Fa "Dwarf_Fde **fde_list"
43 .Fa "Dwarf_Signed *fde_count"
44 .Fa "Dwarf_Error *err"
47 .Fo dwarf_get_fde_list_eh
49 .Fa "Dwarf_Cie **cie_list"
50 .Fa "Dwarf_Signed *cie_count"
51 .Fa "Dwarf_Fde **fde_list"
52 .Fa "Dwarf_Signed *fde_count"
53 .Fa "Dwarf_Error *err"
56 These functions retrieve frame related information for the specified
60 .Fn dwarf_get_fde_list
61 retrieves frame information from the DWARF section named
63 For objects containing GNU style C++ exception handling
64 information, the function
65 .Fn dwarf_get_fde_list_eh
66 retrieves frame information from the section named
69 Frame information is returned using opaque descriptors
74 Applications need to use the other frame related functions in the
75 DWARF(3) API set to retrieve the information contained in these
80 should reference a DWARF debug context allocated using
85 should point to a location that will be set to a pointer to an array
92 should point to a location that will be set to the number of
98 should point to a location that will be set to a pointer to an array
105 should point to a location that will be set to the number of
107 descriptors returned.
111 is not NULL, it will be used to store error information in case of an
113 .Ss Memory Management
114 The memory areas used for the arrays returned in arguments
120 Application code should not attempt to directly free these areas.
121 Portable applications should instead use the
122 .Xr dwarf_fde_cie_list_dealloc 3
123 function to indicate that these memory areas may be freed.
125 On success, these functions returns
129 if there is no frame information associated with the given DWARF
131 In case of an error, they return
136 These functions may fail with the following errors:
137 .Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
138 .It Bq Er DW_DLE_ARGUMENT
147 .It Bq Er DW_DLE_NO_ENTRY
148 There is no frame information associated with the giving DWARF debug
152 To obtain frame information from the
155 .Bd -literal -offset indent
157 Dwarf_Cie *cie_list, cie;
158 Dwarf_Fde *fde_list, fde;
159 Dwarf_Off fde_offset, cie_offset;
160 Dwarf_Unsigned func_len, fde_length, fde_instlen;
161 Dwarf_Signed cie_count, fde_count, cie_index;
163 Dwarf_Ptr fde_addr, fde_inst, cie_inst;
167 if (dwarf_get_fde_list(dbg, &cie_list, &cie_count,
168 &fde_list, &fde_count, &de) != DW_DLV_OK) {
169 errx(EXIT_FAILURE, "dwarf_get_fde_list failed: %s",
173 for (i = 0; i < fde_count; i++) {
174 if (dwarf_get_fde_n(fde_list, i, &fde, &de) != DW_DLV_OK) {
175 warnx("dwarf_get_fde_n failed: %s",
179 if (dwarf_get_cie_of_fde(fde, &cie, &de) != DW_DLV_OK) {
180 warnx("dwarf_get_fde_n failed: %s",
184 if (dwarf_get_fde_range(fde, &low_pc, &func_len, &fde_addr,
185 &fde_length, &cie_offset, &cie_index, &fde_offset,
187 warnx("dwarf_get_fde_range failed: %s",
191 if (dwarf_get_fde_instr_bytes(fde, &fde_inst, &fde_instlen,
193 warnx("dwarf_get_fde_instr_bytes failed: %s",
198 /* ... Use the retrieved frame information ... */
201 /* Indicate that the returned arrays may be freed. */
202 dwarf_fde_cie_list_dealloc(dbg, cie_list, cie_count, fde_list,
207 .Xr dwarf_get_cie_index 3 ,
208 .Xr dwarf_get_cie_of_fde 3 ,
209 .Xr dwarf_get_fde_at_pc 3 ,
210 .Xr dwarf_get_fde_instr_bytes 3 ,
211 .Xr dwarf_get_fde_n 3 ,
212 .Xr dwarf_get_fde_range 3 ,
213 .Xr dwarf_fde_cie_list_dealloc 3 ,
214 .Xr dwarf_set_frame_cfa_value 3 ,
215 .Xr dwarf_set_frame_rule_table_size 3 ,
216 .Xr dwarf_set_frame_rule_initial_value 3 ,
217 .Xr dwarf_set_frame_same_value 3 ,
218 .Xr dwarf_set_frame_undefined_value 3