1 .\" Copyright (c) 2011 Kai Wang
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25 .\" $Id: dwarf_expand_frame_instructions.3 3644 2018-10-15 19:55:01Z jkoshy $
28 .Dt DWARF_EXPAND_FRAME_INSTRUCTIONS 3
31 .Nm dwarf_expand_frame_instructions
32 .Nd expand frame instructions
38 .Fo dwarf_expand_frame_instructions
40 .Fa "Dwarf_Ptr instructions"
41 .Fa "Dwarf_Unsigned len"
42 .Fa "Dwarf_Frame_Op **ret_ops"
43 .Fa "Dwarf_Signed *ret_opcnt"
44 .Fa "Dwarf_Error *error"
48 .Fn dwarf_expand_frame_instructions
49 translates DWARF frame instruction bytes into an array of
55 should reference the CIE descriptor associated with the instructions
60 should point to an array of frame instruction bytes, as
61 returned by the functions
62 .Xr dwarf_get_cie_info 3
64 .Xr dwarf_get_fde_instr_bytes 3 .
68 should specify the number of the frame instruction bytes to be
73 should point to a location that will be set to a pointer to
74 an array of translated
80 should point to a location that will hold the total number of the
85 is not NULL, it will be used to store error information in case of an
88 The memory area used for the descriptor array returned in argument
92 Application code should use function
95 .Dv DW_DLA_FRAME_BLOCK
96 to free the memory area when the descriptor array is no longer needed.
99 .Fn dwarf_expand_frame_instructions
103 In case of an error, it returns
105 and sets the argument
108 To retrieve and expand the frame instructions for a given FDE
110 .Bd -literal -offset indent
115 Dwarf_Unsigned fde_instlen;
120 /* ... assuming `dbg` references a valid DWARF debugging context,
121 `fde` references a valid FDE descriptor and `cie` holds the CIE
122 descriptor associated with the FDE descriptor ... */
124 if (dwarf_get_fde_instr_bytes(fde, &fde_inst, &fde_instlen,
126 errx(EXIT_FAILURE, "dwarf_get_fde_instr_bytes failed: %s",
129 if (dwarf_expand_frame_instructions(cie, fde_inst, fde_instlen,
130 &ops, &opcnt, &de) != DW_DLV_OK)
132 "dwarf_expand_frame_instructions failed: %s",
135 for (i = 0; i < opcnt; i++) {
136 /* ... use ops[i] ... */
139 /* Free the memory area when no longer needed. */
140 dwarf_dealloc(dbg, ops, DW_DLA_FRAME_BLOCK);
144 .Fn dwarf_expand_frame_instructions
146 .Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
147 .It Bq Er DW_DLE_ARGUMENT
155 .It Bq Er DW_DLE_ARGUMENT
159 .It Bq Er DW_DLE_MEMORY
160 An out of memory condition was encountered during the execution of
162 .It Bq Er DW_DLE_FRAME_INSTR_EXEC_ERROR
163 An unknown instruction was found in the instruction bytes provided
169 .Xr dwarf_frame_instructions_dealloc 3 ,
170 .Xr dwarf_get_cie_index 3 ,
171 .Xr dwarf_get_cie_info 3 ,
172 .Xr dwarf_get_cie_of_fde 3 ,
173 .Xr dwarf_get_fde_at_pc 3 ,
174 .Xr dwarf_get_fde_info_for_all_regs 3 ,
175 .Xr dwarf_get_fde_info_for_all_regs3 3 ,
176 .Xr dwarf_get_fde_info_for_cfa_reg3 3 ,
177 .Xr dwarf_get_fde_info_for_reg 3 ,
178 .Xr dwarf_get_fde_info_for_reg3 3 ,
179 .Xr dwarf_get_fde_instr_bytes 3 ,
180 .Xr dwarf_get_fde_list 3 ,
181 .Xr dwarf_get_fde_list_eh 3 ,
182 .Xr dwarf_get_fde_n 3