Toolchain/binutils-gdb
1
0
Fork 0
forked from Imagelibrary/binutils-gdb
Code Pull Requests Activity

libctf, open: new API for getting the size of CTF/BTF file sections

Browse Source 
I wrote this for BTF type size querying programs, but it might be
of more general use and it's impossible to get this info in any
other way, so we might want to keep it.

New API:
+size_t ctf_sect_size (ctf_dict_t *, ctf_sect_names_t sect);
This commit is contained in:
Nick Alcock
2025-04-25 11:51:04 +01:00
parent 4837852527
commit f7f72bcca6
3 changed files with 49 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
libctf/ctf-open.c
View File

@@ -2505,6 +2505,50 @@ ctf_symsect_endianness (ctf_dict_t *fp, int little_endian)
assert (init_symtab (fp, fp->ctf_header, &fp->ctf_ext_symtab) == 0);
}
/* Return the size in bytes of a given CTF section, or 0 if none. */
size_t
ctf_sect_size (ctf_dict_t *fp, ctf_sect_names_t sect)
{
switch (sect)
{
case CTF_SECT_HEADER:
switch (CTH_VERSION (fp->ctf_header))
{
case CTF_VERSION_1:
case CTF_VERSION_1_UPGRADED_3:
case CTF_VERSION_2:
return sizeof (ctf_header_v2_t);
case CTF_VERSION_3:
return sizeof (ctf_header_v3_t);
case CTF_VERSION_4:
default:
if (fp->ctf_opened_btf)
return sizeof (ctf_btf_header_t);
else
return sizeof (ctf_header_t);
}
case CTF_SECT_OBJT:
return fp->ctf_header->cth_objtidx_len + fp->ctf_header->cth_objt_len;
case CTF_SECT_FUNC:
return fp->ctf_header->cth_funcidx_len + fp->ctf_header->cth_func_len;
case CTF_SECT_VAR:
if (fp->ctf_v3_header)
return fp->ctf_v3_header->cth_typeoff - fp->ctf_v3_header->cth_varoff;
else
return 0;
case CTF_SECT_TYPE:
return fp->ctf_header->btf.bth_type_len;
case CTF_SECT_STR:
return fp->ctf_header->btf.bth_str_len;
default:
ctf_set_errno (fp, ECTF_DUMPSECTUNKNOWN);
return 0;
}
}
/* Return the CTF handle for the parent CTF dict, if one exists. Otherwise
return NULL to indicate this dict has no imported parent. */
ctf_dict_t *