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30d1f01849
This patch adds the CTF (Compact Ansi-C Type Format) support in gdb. Two submissions on which this gdb work depends were posted earlier in May: * On the binutils mailing list - adding libctf which creates, updates, reads, and manipulates the CTF data. * On the gcc mailing list - expanding gcc to directly emit the CFT data with a new command line option -gt. CTF is a reduced form of debugging information whose main purpose is to describe the type of C entities such as structures, unions, typedefs and function arguments at the global scope only. It does not contain debug information about source lines, location expressions, or local variables. For more information on CTF, see the documentation in the libdtrace-ctf source tree, available here: <https://raw.githubusercontent.com/oracle/libdtrace-ctf/master/doc/ctf-format>. This patch expands struct elfinfo by adding the .ctf section, which contains CTF debugging info, and modifies elf_symfile_read() to read it. If both DWARF and CTF exist in a program, only DWARF will be read. CTF data will be read only when there is no DWARF. The two-stage symbolic reading and setting strategy, partial and full, was used. File ctfread.c contains functions to transform CTF data into gdb's internal symbol table structures by iterately reading entries from CTF sections of "data objects", "function info", "variable info", and "data types" when setting up either partial or full symbol table. If the ELF symbol table is available, e.g. not stripped, the CTF reader will associate the found type information with these symbol entries. Due to the proximity between DWARF and CTF (CTF being a much simplified subset of DWARF), some DWARF implementation was reused to support CTF. Test cases ctf-constvars.exp, ctf-cvexpr.exp, ctf-ptype.exp, and ctf-whatis.exp have been added to verify the correctness of this support. This patch has missing features and limitations which we will add and address in the future patches. gdb/ChangeLog +2019-10-07 Weimin Pan <weimin.pan@oracle.com> + + * gdb/ctfread.c: New file. + * gdb/ctfread.h: New file. + * gdb/elfread.c: Include ctfread.h. + (struct elfinfo text_p): New member ctfsect. + (elf_locate_sections): Mark CTF section. + (elf_symfile_read): Call elfctf_build_psymtabs. + * gdb/Makefile.in (LIBCTF): Add. + (CLIBS): Use it. + (CDEPS): Likewise. + (DIST): Add ctfread.c. + * Makefile.def (dependencies): Add all-libctf to all-gdb + * Makefile.in: Add "all-gdb: maybe-all-libctf" + gdb/testsuite/ChangeLog +2019-10-07 Weimin Pan <weimin.pan@oracle.com> + + * gdb.base/ctf-whatis.exp: New file. + * gdb.base/ctf-whatis.c: New file. + * gdb.base/ctf-ptype.exp: New file. + * gdb.base/ctf-ptype.c: New file. + * gdb.base/ctf-constvars.exp: New file. + * gdb.base/ctf-constvars.c: New file. + * gdb.base/ctf-cvexpr.exp: New file. +
26 lines
895 B
C
26 lines
895 B
C
/* CTF debugging format support for GDB.
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Copyright (C) 2019 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef CTFREAD_H
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#define CTFREAD_H
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extern void elfctf_build_psymtabs (struct objfile *objfile);
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#endif /* CTFREAD_H */
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