binutils-gdb

Tree: 203bfa2f6b

History

Nick Alcock 203bfa2f6b include, libctf, ld: extend variable section to contain functions too The CTF variable section is an optional (usually-not-present) section in the CTF dict which contains name -> type mappings corresponding to data symbols that are present in the linker input but not in the output symbol table: the idea is that programs that use their own symbol- resolution mechanisms can use this section to look up the types of symbols they have found using their own mechanism. Because these removed symbols (mostly static variables, functions, etc) all have names that are unlikely to appear in the ELF symtab and because very few programs have their own symbol-resolution mechanisms, a special linker flag (--ctf-variables) is needed to emit this section. Historically, we emitted only removed data symbols into the variable section. This seemed to make sense at the time, but in hindsight it really doesn't: functions are symbols too, and a C program can look them up just like any other type. So extend the variable section so that it contains all static function symbols too (if it is emitted at all), with types of kind CTF_K_FUNCTION. This is a little fiddly. We relied on compiler assistance for data symbols: the compiler simply emits all data symbols twice, once into the symtypetab as an indexed symbol and once into the variable section. Rather than wait for a suitably adjusted compiler that does the same for function symbols, we can pluck unreported function symbols out of the symtab and add them to the variable section ourselves. While we're at it, we do the same with data symbols: this is redundant right now because the compiler does it, but it costs very little time and lets the compiler drop this kludge and save a little space in .o files. include/ * ctf.h: Mention the new things we can see in the variable section. ld/ * testsuite/ld-ctf/data-func-conflicted-vars.d: New test. libctf/ * ctf-link.c (ctf_link_deduplicating_variables): Duplicate symbols into the variable section too. * ctf-serialize.c (symtypetab_delete_nonstatic_vars): Rename to... (symtypetab_delete_nonstatics): ... this. Check the funchash when pruning redundant variables. (ctf_symtypetab_sect_sizes): Adjust accordingly. * NEWS: Describe this change.		4 years ago
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doc	libctf: delete unused libctf_TEXINFOS	4 years ago
testsuite	Update year range in copyright notice of binutils files	4 years ago
.gitignore	libctf: restructure error handling to reduce relocations	6 years ago
ChangeLog	Add markers for 2.38 branch	4 years ago
ChangeLog-2020	libctf: fix old ChangeLog typo	5 years ago
Makefile.am	Update year range in copyright notice of binutils files	4 years ago
Makefile.in	libctf: delete unused libctf_TEXINFOS	4 years ago
NEWS	include, libctf, ld: extend variable section to contain functions too	4 years ago
aclocal.m4	Implement a workaround for GNU mak jobserver	5 years ago
config.h.in	libctf, dedup: add deduplicator	6 years ago
configure	libctf: re-generate configure	4 years ago
configure.ac	Update year range in copyright notice of binutils files	4 years ago
ctf-archive.c	Update year range in copyright notice of binutils files	4 years ago
ctf-create.c	Update year range in copyright notice of binutils files	4 years ago
ctf-decl.c	Update year range in copyright notice of binutils files	4 years ago
ctf-decls.h	Update year range in copyright notice of binutils files	4 years ago
ctf-dedup.c	Update year range in copyright notice of binutils files	4 years ago
ctf-dump.c	Update year range in copyright notice of binutils files	4 years ago
ctf-endian.h	Update year range in copyright notice of binutils files	4 years ago
ctf-error.c	Update year range in copyright notice of binutils files	4 years ago
ctf-hash.c	Update year range in copyright notice of binutils files	4 years ago
ctf-impl.h	Update year range in copyright notice of binutils files	4 years ago
ctf-inlines.h	Update year range in copyright notice of binutils files	4 years ago
ctf-intl.h	Update year range in copyright notice of binutils files	4 years ago
ctf-labels.c	Update year range in copyright notice of binutils files	4 years ago
ctf-link.c	include, libctf, ld: extend variable section to contain functions too	4 years ago
ctf-lookup.c	Update year range in copyright notice of binutils files	4 years ago
ctf-open-bfd.c	Update year range in copyright notice of binutils files	4 years ago
ctf-open.c	Update year range in copyright notice of binutils files	4 years ago
ctf-qsort_r.c	Update year range in copyright notice of binutils files	4 years ago
ctf-serialize.c	include, libctf, ld: extend variable section to contain functions too	4 years ago
ctf-sha1.c	Update year range in copyright notice of binutils files	4 years ago
ctf-sha1.h	Update year range in copyright notice of binutils files	4 years ago
ctf-string.c	Update year range in copyright notice of binutils files	4 years ago
ctf-subr.c	Update year range in copyright notice of binutils files	4 years ago
ctf-types.c	Update year range in copyright notice of binutils files	4 years ago
ctf-util.c	Update year range in copyright notice of binutils files	4 years ago
elf.h	Update year range in copyright notice of binutils files	4 years ago
libctf.ver	Update year range in copyright notice of binutils files	4 years ago
swap.h	Update year range in copyright notice of binutils files	4 years ago