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binutils-gdb/gdb/testsuite/gdb.base/ctf-cvexpr.exp
Weimin Pan 30d1f01849 gdb: CTF support 
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.
+
2019-10-07 02:26:27 +00:00

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# Copyright (C) 2019 Free Software Foundation, Inc.
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# This file is a subset of cvexpr.exp written by
# Michael Snyder, Red Hat, Inc., 9/20/2001
# This file is part of the gdb testsuite
# Tests for type expressions using const and volatile keywords.
#
# test running programs
#
# -gt generates full-fledged CTF.
standard_testfile cvexpr.c
set opts "additional_flags=-gt"
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
untested "failed to compile"
return -1
}
clean_restart ${binfile}
gdb_test_no_output "set print sevenbit-strings"
gdb_test_no_output "set print address off"
gdb_test_no_output "set width 0"
set ws "\[ \t\]*"
#
# Test casting a scalar to const
#
gdb_test "whatis (const char) v_char" \
"type = const char" \
"(const char)"
gdb_test "whatis (const signed char) v_signed_char" \
"type = const signed char" \
"(const signed char)"
gdb_test "whatis (const unsigned char) v_unsigned_char" \
"type = const (unsigned char|char)" \
"(const unsigned char)"
gdb_test "whatis (const short) v_short" \
"type = const (short|short int)" \
"(const short)"
gdb_test "whatis (const signed short) v_signed_short" \
"type = const (short|short int|signed short|signed short int)" \
"(const signed short)"
gdb_test "whatis (const unsigned short) v_unsigned_short" \
"type = const (unsigned short|short unsigned int)" \
"(const unsigned short)"
gdb_test "whatis (const int) v_int" \
"type = const int" \
"(const int)"
gdb_test "whatis (const signed int) v_signed_int" \
"type = const (signed int|int)" \
"(const signed int)"
gdb_test "whatis (const unsigned int) v_unsigned_int" \
"type = const unsigned int" \
"(const unsigned int)"
gdb_test "whatis (const long) v_long" \
"type = const (long|long int)" \
"(const long)"
gdb_test "whatis (const signed long) v_signed_long" \
"type = const (signed |)long( int|)" \
"(const signed long)"
gdb_test "whatis (const unsigned long) v_unsigned_long" \
"type = const (unsigned long|long unsigned int)" \
"(const unsigned long)"
gdb_test "whatis (const long long) v_long_long" \
"type = const long long( int|)" \
"(const long long)"
gdb_test "whatis (const signed long long) v_signed_long_long" \
"type = const (signed |)long long( int|)" \
"(const signed long long)"
gdb_test "whatis (const unsigned long long) v_unsigned_long_long" \
"type = const (unsigned long long|long long unsigned int)" \
"(const unsigned long long)"
gdb_test "whatis (const float) v_float" \
"type = const float" \
"(const float)"
gdb_test "whatis (const double) v_double" \
"type = const double" \
"(const double)"
#
# Test casting a scalar to volatile
#
gdb_test "whatis (volatile char) v_char" \
"type = volatile char" \
"(volatile char)"
gdb_test "whatis (volatile signed char) v_signed_char" \
"type = volatile signed char" \
"(volatile signed char)"
gdb_test "whatis (volatile unsigned char) v_unsigned_char" \
"type = volatile (unsigned char|char)" \
"(volatile unsigned char)"
gdb_test "whatis (volatile short) v_short" \
"type = volatile (short|short int)" \
"(volatile short)"
gdb_test "whatis (volatile signed short) v_signed_short" \
"type = volatile (short|short int|signed short|signed short int)" \
"(volatile signed short)"
gdb_test "whatis (volatile unsigned short) v_unsigned_short" \
"type = volatile (unsigned short|short unsigned int)" \
"(volatile unsigned short)"
gdb_test "whatis (volatile int) v_int" \
"type = volatile int" \
"(volatile int)"
gdb_test "whatis (volatile signed int) v_signed_int" \
"type = volatile (signed int|int)" \
"(volatile signed int)"
gdb_test "whatis (volatile unsigned int) v_unsigned_int" \
"type = volatile unsigned int" \
"(volatile unsigned int)"
gdb_test "whatis (volatile long) v_long" \
"type = volatile (long|long int)" \
"(volatile long)"
gdb_test "whatis (volatile signed long) v_signed_long" \
"type = volatile (signed |)long( int|)" \
"(volatile signed long)"
gdb_test "whatis (volatile unsigned long) v_unsigned_long" \
"type = volatile (unsigned long|long unsigned int)" \
"(volatile unsigned long)"
gdb_test "whatis (volatile long long) v_long_long" \
"type = volatile long long( int|)" \
"(volatile long long)"
gdb_test "whatis (volatile signed long long) v_signed_long_long" \
"type = volatile (signed |)long long( int|)" \
"(volatile signed long long)"
gdb_test "whatis (volatile unsigned long long) v_unsigned_long_long" \
"type = volatile (unsigned long long|long long unsigned int)" \
"(volatile unsigned long long)"
gdb_test "whatis (volatile float) v_float" \
"type = volatile float" \
"(volatile float)"
gdb_test "whatis (volatile double) v_double" \
"type = volatile double" \
"(volatile double)"
#
# Combine const and volatile
#
gdb_test "whatis (const volatile int) v_int" \
"type = const volatile int" \
"(const volatile int)"
gdb_test "whatis (volatile const int) v_int" \
"type = const volatile int" \
"(volatile const int)"
gdb_test "whatis (const int volatile) v_int" \
"type = const volatile int" \
"(const int volatile)"
gdb_test "whatis (volatile int const) v_int" \
"type = const volatile int" \
"(volatile int const)"
gdb_test "whatis (int const volatile) v_int" \
"type = const volatile int" \
"(int const volatile)"
gdb_test "whatis (int volatile const) v_int" \
"type = const volatile int" \
"(int volatile const)"
gdb_test "whatis (const volatile int *) v_int_pointer" \
"type = const volatile int${ws}\\*" \
"(const volatile int *)"
gdb_test "whatis (volatile const int *) v_int_pointer" \
"type = const volatile int${ws}\\*" \
"(volatile const int *)"
gdb_test "whatis (const int volatile *) v_int_pointer" \
"type = const volatile int${ws}\\*" \
"(const int volatile)"
gdb_test "whatis (volatile int const *) v_int_pointer" \
"type = const volatile int${ws}\\*" \
"(volatile int const *)"
gdb_test "whatis (int const volatile *) v_int_pointer" \
"type = const volatile int${ws}\\*" \
"(int const volatile *)"
gdb_test "whatis (int volatile const *) v_int_pointer" \
"type = const volatile int${ws}\\*" \
"(int volatile const *)"
gdb_test "whatis (int * const volatile) v_int_pointer" \
"type = int${ws}\\*${ws}const volatile" \
"(int * const volatile)"
gdb_test "whatis (int * volatile const) v_int_pointer" \
"type = int${ws}\\*${ws}const volatile" \
"(int * volatile const)"
#
# Put 'signed' and 'unsigned' before const/volatile (FIXME)
#
#gdb_test "whatis (signed const char) v_signed_char" \
# "type = const char" \
# "(signed const char)"
#gdb_test "whatis (unsigned const char) v_unsigned_char" \
# "type = const (unsigned char|char)" \
# "(unsigned const char)"
#gdb_test "whatis (signed const short) v_signed_short" \
# "type = const (short|short int|signed short|signed short int)" \
# "(signed const short)"
#gdb_test "whatis (unsigned const short) v_unsigned_short" \
# "type = const (unsigned short|short unsigned int)" \
# "(unsigned const short)"
#gdb_test "whatis (signed const int) v_signed_int" \
# "type = const (signed int|int)" \
# "(signed const int)"
#gdb_test "whatis (unsigned const int) v_unsigned_int" \
# "type = const unsigned int" \
# "(unsigned const int)"
#gdb_test "whatis (signed const long) v_signed_long" \
# "type = const (signed |)long( int|)" \
# "(signed const long)"
#gdb_test "whatis (unsigned const long) v_unsigned_long" \
# "type = const (unsigned long|long unsigned int)" \
# "(unsigned const long)"
#gdb_test "whatis (signed const long long) v_signed_long_long" \
# "type = const (signed |)long long( int|)" \
# "(signed const long long)"
#gdb_test "whatis (unsigned const long long) v_unsigned_long_long" \
# "type = const (unsigned long long|long long unsigned int)" \
# "(const unsigned long long)"
#gdb_test "whatis (signed volatile char) v_signed_char" \
# "type = volatile char" \
# "(signed volatile char)"
#gdb_test "whatis (unsigned volatile char) v_unsigned_char" \
# "type = volatile (unsigned char|char)" \
# "(unsigned volatile char)"
#gdb_test "whatis (signed volatile short) v_signed_short" \
# "type = volatile (short|short int|signed short|signed short int)" \
# "(signed volatile short)"
#gdb_test "whatis (unsigned volatile short) v_unsigned_short" \
# "type = volatile (unsigned short|short unsigned int)" \
# "(unsigned volatile short)"
#gdb_test "whatis (signed volatile int) v_signed_int" \
# "type = volatile (signed int|int)" \
# "(signed volatile int)"
#gdb_test "whatis (unsigned volatile int) v_unsigned_int" \
# "type = volatile unsigned int" \
# "(unsigned volatile int)"
#gdb_test "whatis (signed volatile long) v_signed_long" \
# "type = volatile (signed |)long( int|)" \
# "(signed volatile long)"
#gdb_test "whatis (unsigned volatile long) v_unsigned_long" \
# "type = volatile (unsigned long|long unsigned int)" \
# "(unsigned volatile long)"
#gdb_test "whatis (signed volatile long long) v_signed_long_long" \
# "type = volatile (signed |)long long( int|)" \
# "(signed volatile long long)"
#gdb_test "whatis (unsigned volatile long long) v_unsigned_long_long" \
# "type = volatile (unsigned long long|long long unsigned int)" \
# "(unsigned volatile long long)"
#
# Now put the 'const' and 'volatile' keywords after the base type.
#
gdb_test "whatis (char const) v_char" \
"type = const char" \
"(char const)"
gdb_test "whatis (signed char const) v_signed_char" \
"type = const signed char" \
"(signed char const)"
gdb_test "whatis (unsigned char const) v_unsigned_char" \
"type = const (unsigned char|char)" \
"(unsigned char const)"
gdb_test "whatis (short const) v_short" \
"type = const (short|short int)" \
"(short const)"
gdb_test "whatis (signed short const) v_signed_short" \
"type = const (short|short int|signed short|signed short int)" \
"(signed short const)"
gdb_test "whatis (unsigned short const) v_unsigned_short" \
"type = const (unsigned short|short unsigned int)" \
"(unsigned short const)"
gdb_test "whatis (int const) v_int" \
"type = const int" \
"(int const)"
gdb_test "whatis (signed int const) v_signed_int" \
"type = const (signed int|int)" \
"(signed int const)"
gdb_test "whatis (unsigned int const) v_unsigned_int" \
"type = const unsigned int" \
"(unsigned int const)"
gdb_test "whatis (long const) v_long" \
"type = const (long|long int)" \
"(long const)"
gdb_test "whatis (signed long const) v_signed_long" \
"type = const (signed |)long( int|)" \
"(signed long const)"
gdb_test "whatis (unsigned long const) v_unsigned_long" \
"type = const (unsigned long|long unsigned int)" \
"(unsigned long const)"
gdb_test "whatis (long long const) v_long_long" \
"type = const long long( int|)" \
"(long long const)"
gdb_test "whatis (signed long long const) v_signed_long_long" \
"type = const (signed |)long long( int|)" \
"(signed long long const)"
gdb_test "whatis (unsigned long long const) v_unsigned_long_long" \
"type = const (unsigned long long|long long unsigned int)" \
"(unsigned long long const)"
gdb_test "whatis (float const) v_float" \
"type = const float" \
"(float const)"
gdb_test "whatis (double const) v_double" \
"type = const double" \
"(double const)"
gdb_test "whatis (char volatile) v_char" \
"type = volatile char" \
"(char volatile)"
gdb_test "whatis (signed char volatile) v_signed_char" \
"type = volatile signed char" \
"(signed char volatile)"
gdb_test "whatis (unsigned char volatile) v_unsigned_char" \
"type = volatile (unsigned char|char)" \
"(unsigned char volatile)"
gdb_test "whatis (short volatile) v_short" \
"type = volatile (short|short int)" \
"(short volatile)"
gdb_test "whatis (signed short volatile) v_signed_short" \
"type = volatile (short|short int|signed short|signed short int)" \
"(signed short volatile)"
gdb_test "whatis (unsigned short volatile) v_unsigned_short" \
"type = volatile (unsigned short|short unsigned int)" \
"(unsigned short volatile)"
gdb_test "whatis (int volatile) v_int" \
"type = volatile int" \
"(int volatile)"
gdb_test "whatis (signed int volatile) v_signed_int" \
"type = volatile (signed int|int)" \
"(signed int volatile)"
gdb_test "whatis (unsigned int volatile) v_unsigned_int" \
"type = volatile unsigned int" \
"(unsigned int volatile)"
gdb_test "whatis (long volatile) v_long" \
"type = volatile (long|long int)" \
"(long volatile)"
gdb_test "whatis (signed long volatile) v_signed_long" \
"type = volatile (signed |)long( int|)" \
"(signed long volatile)"
gdb_test "whatis (unsigned long volatile) v_unsigned_long" \
"type = volatile (unsigned long|long unsigned int)" \
"(unsigned long volatile)"
gdb_test "whatis (long long volatile) v_long_long" \
"type = volatile long long( int|)" \
"(long long volatile)"
gdb_test "whatis (signed long long volatile) v_signed_long_long" \
"type = volatile (signed |)long long( int|)" \
"(signed long long volatile)"
gdb_test "whatis (unsigned long long volatile) v_unsigned_long_long" \
"type = volatile (unsigned long long|long long unsigned int)" \
"(unsigned long long volatile)"
gdb_test "whatis (float volatile) v_float" \
"type = volatile float" \
"(float volatile)"
gdb_test "whatis (double volatile) v_double" \
"type = volatile double" \
"(double volatile)"
#
# enums
#
gdb_test "whatis (const enum misordered) v_misordered" \
"type = const enum misordered" \
"(const enum misordered)"
gdb_test "whatis (enum misordered const) v_misordered" \
"type = const enum misordered" \
"(enum misordered const)"
gdb_test "whatis (volatile enum misordered) v_misordered" \
"type = volatile enum misordered" \
"(volatile enum misordered)"
gdb_test "whatis (enum misordered volatile) v_misordered" \
"type = volatile enum misordered" \
"(enum misordered volatile)"
#
# Pointers
#
gdb_test "whatis (const int *) v_int_pointer" \
"type = const int${ws}\\*" \
"(const int *)"
gdb_test "whatis (int const *) v_int_pointer" \
"type = const int${ws}\\*" \
"(int const *)"
gdb_test "whatis (int * const) v_int_pointer" \
"type = int \\*${ws}const" \
"(int * const)"
gdb_test "whatis (const int * const) v_int_pointer" \
"type = const int${ws}\\*${ws}const" \
"(const int * const)"
gdb_test "whatis (int const * const) v_int_pointer" \
"type = const int${ws}\\*${ws}const" \
"(int const * const)"
gdb_test "whatis (const int **) v_int_pointer_pointer" \
"type = const int${ws}\\*${ws}\\*" \
"(const int **)"
gdb_test "whatis (int const **) v_int_pointer_pointer" \
"type = const int${ws}\\*${ws}\\*" \
"(int const **)"
gdb_test "whatis (int ** const) v_int_pointer_pointer" \
"type = int \\*${ws}\\*${ws}const" \
"(int ** const)"
gdb_test "whatis (const int * const *) v_int_pointer_pointer" \
"type = const int${ws}\\*${ws}const${ws}\\*" \
"(const int * const *)"
gdb_test "whatis (int const * const *) v_int_pointer_pointer" \
"type = const int${ws}\\*${ws}const${ws}\\*" \
"(int const * const *)"
gdb_test "whatis (const int * const * const) v_int_pointer_pointer" \
"type = const int${ws}\\*${ws}const${ws}\\*${ws}const" \
"(const int * const * const)"
gdb_test "whatis (int const * const * const) v_int_pointer_pointer" \
"type = const int${ws}\\*${ws}const${ws}\\*${ws}const" \
"(int const * const * const)"
#
# Arrays TODO
#
#
# Pointers to arrays, arrays of pointers TODO
#
#
# Structs and Unions
#
gdb_test "whatis (const struct t_struct) v_struct1" \
"type = const struct t_struct" \
"(const struct t_struct)"
gdb_test "whatis (const union t_union) v_union" \
"type = const union t_union" \
"(const union t_union)"
gdb_test "whatis (struct t_struct const) v_struct1" \
"type = const struct t_struct" \
"(struct t_struct const)"
gdb_test "whatis (union t_union const) v_union" \
"type = const union t_union" \
"(union t_union const)"
gdb_test "whatis (const struct t_struct *) &v_struct1" \
"type = const struct t_struct${ws}\\*" \
"(const struct t_struct *)"
gdb_test "whatis (const union t_union *) &v_union" \
"type = const union t_union${ws}\\*" \
"(const union t_union *)"
gdb_test "whatis (struct t_struct const *) &v_struct1" \
"type = const struct t_struct${ws}\\*" \
"(struct t_struct const *)"
gdb_test "whatis (union t_union const *) &v_union" \
"type = const union t_union${ws}\\*" \
"(union t_union const *)"
gdb_test "whatis (struct t_struct * const) &v_struct1" \
"type = struct t_struct${ws}\\*${ws}const" \
"(struct t_struct * const)"
gdb_test "whatis (union t_union * const) &v_union" \
"type = union t_union${ws}\\*${ws}const" \
"(union t_union * const)"
gdb_test "whatis (const struct t_struct * const) &v_struct1" \
"type = const struct t_struct${ws}\\*${ws}const" \
"(const struct t_struct * const)"
gdb_test "whatis (const union t_union * const) &v_union" \
"type = const union t_union${ws}\\*${ws}const" \
"(const union t_union * const)"
gdb_test "whatis (struct t_struct const * const) &v_struct1" \
"type = const struct t_struct${ws}\\*${ws}const" \
"(struct t_struct const * const)"
gdb_test "whatis (union t_union const * const) &v_union" \
"type = const union t_union${ws}\\*${ws}const" \
"(union t_union const * const)"
#
# Function pointers TODO
#
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