1.\" Copyright (c) 2011 Kai Wang
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25.\" $Id: dwarf_add_expr_addr.3 2072 2011-10-27 03:26:49Z jkoshy $
26.\"
27.Dd September 9, 2011
28.Os
29.Dt DWARF_ADD_EXPR_ADDR 3
30.Sh NAME
31.Nm dwarf_add_expr_addr ,
32.Nm dwarf_add_expr_addr_b
33.Nd add a DW_OP_addr location expression
34.Sh LIBRARY
35.Lb libdwarf
36.Sh SYNOPSIS
37.In libdwarf.h
38.Ft "Dwarf_Unsigned"
39.Fo dwarf_add_expr_addr
40.Fa "Dwarf_P_Expr expr"
41.Fa "Dwarf_Unsigned address"
42.Fa "Dwarf_Signed sym_index"
43.Fa "Dwarf_Error *err"
44.Fc
45.Ft "Dwarf_Unsigned"
46.Fo dwarf_add_expr_addr_b
47.Fa "Dwarf_P_Expr expr"
48.Fa "Dwarf_Unsigned address"
49.Fa "Dwarf_Unsigned sym_index"
50.Fa "Dwarf_Error *err"
51.Fc
52.Sh DESCRIPTION
53Function
54.Fn dwarf_add_expr_addr_b
55adds a
56.Dv DW_OP_addr
57location expression to the location expression descriptor referenced
58by argument
59.Ar expr .
60.Pp
61Argument
62.Ar expr
63should reference a location expression descriptor allocated using
64the function
65.Xr dwarf_new_expr 3 .
66.Pp
67Argument
68.Ar address
69specifies the operand, a relocatable address value.
70.Pp
71Argument
72.Ar sym_index
73specifies the ELF symbol index of the symbol to be used for
74relocation.
75.Pp
76If argument
77.Ar err
78is not NULL, it will be used to store error information in case
79of an error.
80.Pp
81Function
82.Fn dwarf_add_expr_addr
83is deprecated.
84It is similar to function
85.Fn dwarf_add_expr_addr_b
86except that it cannot handle all possible symbol index values.
87.Sh RETURN VALUES
88On success, these functions return the size in bytes of the location
89expression byte stream generated.
90In case of an error, these functions return
91.Dv DW_DLV_NOCOUNT
92and set the argument
93.Ar err .
94.Sh ERRORS
95These functions can fail with:
96.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
97.It Bq Er DW_DLE_ARGUMENT
98Argument
99.Ar expr
100was NULL.
101.It Bq Er DW_DLE_MEMORY
102An out of memory condition was encountered during the execution of
103the function.
104.El
105.Sh SEE ALSO
106.Xr dwarf 3 ,
107.Xr dwarf_add_AT_location_expr 3 ,
108.Xr dwarf_add_expr_gen 3 ,
109.Xr dwarf_expr_current_offset 3 ,
110.Xr dwarf_expr_into_block 3 ,
111.Xr dwarf_new_expr 3
112