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abg-ir: elf_symbol: add is_in_ksymtab field

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Being exported through a ksymtab (in case of Linux Kernel binaries) is
actually a property of the Elf symbol itself and we can therefore track
it along with the symbol that we collect from symtab. While tracking is
currently done by keeping separate symbol lists and maps for symtab and
ksymtab symbols, they can be consolidated having a property to indicate
whether this symbol also appeared as a ksymtab entry.

Hence, and for future changes in this area, add this property and update
all references. The flag is false initially unless otherwise specified.

	* include/abg-ir.h (elf_symbol::elf_symbol): Add is_in_ksymtab
	parameter.
	(elf_symbol::create): Likewise.
	(elf_symbol::is_in_ksymtab): New getter declaration.
	(elf_symbol::set_is_in_ksymtab): New setter declaration.
	* src/abg-ir.cc (elf_symbol::priv::priv): Add is_in_ksymtab
	parameter.
	(elf_symbol::priv::is_in_ksymtab_): New field.
	(elf_symbol::elf_symbol): Add is_in_ksymtab parameter.
	(elf_symbol::create): Likewise.
	(elf_symbol::is_in_ksymtab): New getter implementation.
	(elf_symbol::set_is_in_ksymtab): New setter implementation.

Reviewed-by: Giuliano Procida <gprocida@google.com>
Signed-off-by: Matthias Maennich <maennich@google.com>
Signed-off-by: Dodji Seketeli <dodji@redhat.com>
This commit is contained in:
Matthias Maennich 2021-01-27 12:58:35 +00:00 committed by Dodji Seketeli
parent c92d724e01
commit 573c4cad5a
2 changed files with 93 additions and 52 deletions
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12
include/abg-ir.h
View File

@ -842,7 +842,8 @@ private:
bool c,
const version& ve,
visibility vi,
bool is_linux_string_cst = false);
bool is_linux_string_cst = false,
bool is_in_ksymtab = false);
elf_symbol(const elf_symbol&);
@ -865,7 +866,8 @@ public:
bool c,
const version& ve,
visibility vi,
bool is_linux_string_cst = false);
bool is_linux_string_cst = false,
bool is_in_ksymtab = false);
const environment*
get_environment() const;
@ -933,6 +935,12 @@ public:
bool
is_variable() const;
bool
is_in_ksymtab() const;
void
set_is_in_ksymtab(bool is_in_ksymtab);
const elf_symbol_sptr
get_main_symbol() const;

51
src/abg-ir.cc
View File

@ -1316,6 +1316,7 @@ struct elf_symbol::priv
// STT_COMMON definition of that name that has the largest size.
bool is_common_;
bool is_linux_string_cst_;
bool is_in_ksymtab_;
elf_symbol_wptr main_symbol_;
elf_symbol_wptr next_alias_;
elf_symbol_wptr next_common_instance_;
@ -1330,7 +1331,8 @@ struct elf_symbol::priv
visibility_(elf_symbol::DEFAULT_VISIBILITY),
is_defined_(false),
is_common_(false),
is_linux_string_cst_(false)
is_linux_string_cst_(false),
is_in_ksymtab_(false)
{}
priv(const environment* e,
@ -1343,7 +1345,8 @@ struct elf_symbol::priv
bool c,
const elf_symbol::version& ve,
elf_symbol::visibility vi,
bool is_linux_string_cst)
bool is_linux_string_cst,
bool is_in_ksymtab)
: env_(e),
index_(i),
size_(s),
@ -1354,7 +1357,8 @@ struct elf_symbol::priv
visibility_(vi),
is_defined_(d),
is_common_(c),
is_linux_string_cst_(is_linux_string_cst)
is_linux_string_cst_(is_linux_string_cst),
is_in_ksymtab_(is_in_ksymtab)
{
if (!is_common_)
is_common_ = type_ == COMMON_TYPE;
@ -1410,9 +1414,20 @@ elf_symbol::elf_symbol(const environment* e,
bool c,
const version& ve,
visibility vi,
bool is_linux_string_cst)
: priv_(new priv(e, i, s, n, t, b, d,
c, ve, vi, is_linux_string_cst))
bool is_linux_string_cst,
bool is_in_ksymtab)
: priv_(new priv(e,
i,
s,
n,
t,
b,
d,
c,
ve,
vi,
is_linux_string_cst,
is_in_ksymtab))
{}
/// Factory of instances of @ref elf_symbol.
@ -1469,10 +1484,12 @@ elf_symbol::create(const environment* e,
bool c,
const version& ve,
visibility vi,
bool is_linux_string_cst)
bool is_linux_string_cst,
bool is_in_ksymtab)
{
elf_symbol_sptr sym(new elf_symbol(e, i, s, n, t, b, d, c, ve,
vi, is_linux_string_cst));
elf_symbol_sptr sym(new elf_symbol(e, i, s, n, t, b, d, c, ve, vi,
is_linux_string_cst,
is_in_ksymtab));
sym->priv_->main_symbol_ = sym;
return sym;
}
@ -1692,6 +1709,22 @@ bool
elf_symbol::is_variable() const
{return get_type() == OBJECT_TYPE || get_type() == TLS_TYPE;}
/// Getter of the 'is-in-ksymtab' property.
///
/// @return true iff the current symbol is in the Linux Kernel
/// specific 'ksymtab' symbol table.
bool
elf_symbol::is_in_ksymtab() const
{return priv_->is_in_ksymtab_;}
/// Setter of the 'is-in-ksymtab' property.
///
/// @p is_in_ksymtab this is true iff the current symbol is in the
/// Linux Kernel specific 'ksymtab' symbol table.
void
elf_symbol::set_is_in_ksymtab(bool is_in_ksymtab)
{priv_->is_in_ksymtab_ = is_in_ksymtab;}
/// @name Elf symbol aliases
///
/// An alias A for an elf symbol S is a symbol that is defined at the