DWARF_ADD_AT_LOCATION_EXPR(3)

DWARF_ADD_AT_LOCATION_EXPR(3) | Library Functions Manual | DWARF_ADD_AT_LOCATION_EXPR(3)

# NAME

`dwarf_add_AT_location_expr` —
create an attribute descriptor for a location expression

# LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

# SYNOPSIS

`#include <libdwarf.h>`

Dwarf_P_Attribute
`dwarf_add_AT_location_expr`(Dwarf_P_Debug dbg, Dwarf_P_Die die, Dwarf_Half attr, Dwarf_P_Expr loc_expr, Dwarf_Error *err);

# DESCRIPTION

Function `dwarf_add_AT_location_expr`() creates an attribute descriptor for a location expression and attaches it to the debugging information entry referenced by argument die.

Argument dbg should reference a DWARF producer instance allocated using dwarf_producer_init(3) or dwarf_producer_init_b(3).

Argument die should reference a debugging information entry allocated using dwarf_new_die(3).

Argument attr specifies the attribute code of the created attribute descriptor.

Argument loc_expr should reference a location expression descriptor allocated using dwarf_new_expr(3).

The attribute created by function `dwarf_add_AT_location_expr`() will have one of the DWARF forms `DW_FORM_block`, `DW_FORM_block1`, `DW_FORM_block2` or `DW_FORM_block4`, depending on the size of the byte stream generated by the location expression descriptor referenced by argument loc_expr.

If argument err is not `NULL`, it will be used by to store error information in case of an error.

# RETURN VALUES

On success, function `dwarf_add_AT_location_expr`() returns the created attribute descriptor. In case of an error, function `dwarf_add_AT_location_expr`() returns `DW_DLV_BADADDR` and sets the argument err.

# ERRORS

Function `dwarf_add_AT_location_expr`() can fail with:

[`DW_DLE_ARGUMENT`]
  One of the arguments dbg, die or loc_expr was `NULL`.
[`DW_DLE_MEMORY`]
  An out of memory condition was encountered during the execution of the function.

# SEE ALSO

dwarf(3), dwarf_new_die(3), dwarf_new_expr(3), dwarf_producer_init(3), dwarf_producer_init_b(3)

September 5, 2011 | NetBSD 10.0