.\" Copyright (c) 2011 Kai Wang
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.\" $Id: dwarf_expr_into_block.3 3640 2018-10-14 14:09:13Z jkoshy $
.\"
.Dd September 13, 2011
.Dt DWARF_EXPR_INTO_BLOCK 3
.Os
.Sh NAME
.Nm dwarf_expr_into_block
.Nd retrieve the byte stream for a location expression
.Sh LIBRARY
.Lb libdwarf
.Sh SYNOPSIS
.In libdwarf.h
.Ft "Dwarf_Addr"
.Fo dwarf_expr_into_block
.Fa "Dwarf_P_Expr expr"
.Fa "Dwarf_Unsigned *length"
.Fa "Dwarf_Error *err"
.Fc
.Sh DESCRIPTION
Function
.Fn dwarf_expr_into_block
retrieves the byte stream representation of a location expression.
.Pp
Argument
.Ar expr
should reference a location expression descriptor allocated using
.Xr dwarf_new_expr 3 .
.Pp
Argument
.Ar length
should point to a location which will hold the size in bytes of
the retrieved byte stream.
.Pp
If argument
.Ar err
is not NULL, it will be used to store error information in case
of an error.
.Sh RETURN VALUES
On success, function
.Fn dwarf_expr_into_block
returns the address of the first byte of the generated byte stream.
In case of an error, function
.Fn dwarf_expr_into_block
returns
.Dv DW_DLV_BADADDR
and sets the argument
.Ar err .
.Sh ERRORS
Function
.Fn dwarf_expr_into_block
can fail with:
.Bl -tag -width ".Bq Er DW_DLE_ARGUMENT"
.It Bq Er DW_DLE_ARGUMENT
One of the arguments
.Ar expr
or
.Ar length
was NULL.
.It Bq Er DW_DLE_MEMORY
An out of memory condition was encountered during the execution of
the function.
.El
.Sh SEE ALSO
.Xr dwarf 3 ,
.Xr dwarf_add_AT_location_expr 3 ,
.Xr dwarf_add_expr_addr 3 ,
.Xr dwarf_add_expr_addr_b 3 ,
.Xr dwarf_add_expr_gen 3 ,
.Xr dwarf_expr_current_offset 3 ,
.Xr dwarf_new_expr 3