DWARF_HASFORM(3) | Library Functions Manual | DWARF_HASFORM(3)

# NAME

`dwarf_hasform`, `dwarf_whatform`, `dwarf_whatform_direct` —
query attribute forms

# LIBRARY

DWARF Access Library (libdwarf, -ldwarf)

# SYNOPSIS

`#include <libdwarf.h>`

int
`dwarf_hasform`(Dwarf_Attribute attr, Dwarf_Half form, Dwarf_Bool *ret, Dwarf_Error *err);

int
`dwarf_whatform`(Dwarf_Attribute attr, Dwarf_Half *retform, Dwarf_Error *err);

int
`dwarf_whatform_direct`(Dwarf_Attribute attr, Dwarf_Half *retform, Dwarf_Error *err);

# DESCRIPTION

Function `dwarf_hasform`() indicates whether the DWARF attribute denoted by argument attr has the attribute form specified by argument form. If the attribute has the specified form, then argument ret is set to a non-zero value, otherwise it is set to zero. If argument err is non-NULL, it will be used to return an error descriptor in case of an error.

Function `dwarf_whatform`() sets the location specified by argument retform to the attribute form code for the DWARF attribute referenced by argument attr. If the attribute referenced by argument attr has an indirect form attribute, this function will return the final form for the attribute. If argument err is non-NULL, it will be used to return an error descriptor in case of an error.

Function `dwarf_whatform_direct`() sets the location specified by argument retform to the attribute form code for the DWARF attribute referenced by argument attr. If the form is an indirect form, the function sets the location specified by argument retform to `DW_FORM_indirect`. If argument err is non-NULL, it will be used to return an error descriptor in case of an error.

# RETURN VALUES

These functions return `DW_DLV_OK` on success. In case of an error, these functions return `DW_DLV_ERR` and set argument err.

# ERRORS

These functions may fail with the following errors:

[`DW_DLE_ARGUMENT`]
  Any of the arguments attr, ret, or retform was NULL.

# SEE ALSO

dwarf(3), dwarf_attr(3), dwarf_hasattr(3)

May 22, 2010 | NetBSD 9.5