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25 .\" $Id: dwarf_loclist_from_expr.3 2074 2011-10-27 03:34:33Z jkoshy $
29 .Dt DWARF_LOCLIST_FROM_EXPR 3
31 .Nm dwarf_loclist_from_expr ,
32 .Nm dwarf_loclist_from_expr_a
33 .Nd translate DWARF location expression bytes
39 .Fo dwarf_loclist_from_expr
41 .Fa "Dwarf_Ptr bytes_in"
42 .Fa "Dwarf_Unsigned bytes_len"
43 .Fa "Dwarf_Locdesc **llbuf"
44 .Fa "Dwarf_Signed *listlen"
45 .Fa "Dwarf_Error *err"
48 .Fo dwarf_loclist_from_expr_a
50 .Fa "Dwarf_Ptr bytes_in"
51 .Fa "Dwarf_Unsigned bytes_len"
52 .Fa "Dwarf_Half addr_size"
53 .Fa "Dwarf_Locdesc **llbuf"
54 .Fa "Dwarf_Signed *listlen"
55 .Fa "Dwarf_Error *err"
59 .Fn dwarf_loclist_from_expr
60 translates DWARF location expression bytes into a
63 The size for address related data is taken to be the default address
64 size for the object being read.
68 should reference a DWARF debug context allocated using
73 should point to an array of DWARF location expression bytes.
77 should specify the number of the location expression bytes to be
82 should point to a location which will be set to a pointer
89 should point to a location which will hold the number of the
92 In this case it is always set to 1.
96 is not NULL, it will be used to store error information in case of an
100 .Fn dwarf_loclist_from_expr_a
101 is identical to function
102 .Fn dwarf_loclist_from_expr ,
103 except that it requires one additional argument
105 which specifies the address size to use when translating the location
107 .Ss Memory Management
108 The memory area used for the descriptor returned in argument
112 When the descriptor is no longer needed, application code should use
115 to free the memory area in two steps:
120 descriptors pointed to by the
124 descriptor should be deallocated using the allocation type
125 .Dv DW_DLA_LOC_BLOCK .
127 Next, the application should free the
129 pointer using the allocation type
133 On success, these functions returns
135 In case of an error, they return
140 These functions may fail with the following errors:
141 .Bl -tag -width ".Bq Er DW_DLE_LOC_EXPR_BAD"
142 .It Bq Er DW_DLE_ARGUMENT
150 .It Bq Er DW_DLE_ARGUMENT
154 .It Bq Er DW_DLE_ARGUMENT
155 The value of argument
158 .It Bq Er DW_DLE_LOC_EXPR_BAD
159 An unknown or invalid operation was found in the location expression
160 bytes provided in argument
162 .It Bq Er DW_DLE_MEMORY
163 An out of memory condition was encountered during the execution of
168 .Xr dwarf_dealloc 3 ,
169 .Xr dwarf_loclist_n 3 ,
170 .Xr dwarf_get_fde_info_for_all_regs3 3 ,
171 .Xr dwarf_get_fde_info_for_cfa_reg3 3 ,
172 .Xr dwarf_get_fde_info_for_reg3 3 ,
173 .Xr dwarf_get_loclist_entry 3