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[gdb/testsuite] Fix psymtab expansion postponement in c-linkage-name.exp 

The test-case gdb.base/c-linkage-name.exp starts with the following test:
...
gdb_test "print symada__cS" \
         " = {a = 100829103}" \
         "print symada__cS before partial symtab expansion"
...

However, printing the state of the partial symtabs using maint info psymtabs
shows that in fact the symtab has already been expanded:
...
  { psymtab c-linkage-name.c ((struct partial_symtab *) 0x1e27b40)^M
    readin yes^M
...

This is due to set_initial_language, which looks up the main symbol, which
expands the psymtab containing main.

Fix this by moving all but main into a separate source file c-linkage-name-2.c.

Tested on x86_64-linux.

gdb/testsuite/ChangeLog:

2020-02-28  Tom de Vries  <tdevries@suse.de>

	* gdb.base/c-linkage-name.c (main): Call do_something_other_cu.
	(struct wrapper, do_something, mundane/symada__cS): Move ...
	* gdb.base/c-linkage-name-2.c: ... here.  New source file.
	* gdb.base/c-linkage-name.exp: Add verification of psymtab expansion.
	Update "print symada__cS before partial symtab expansion" regexp.
	Update breakpoint location.  Flush symbol cache after expansion.
This commit is contained in:
Tom de Vries 2020-02-28 16:05:50 +01:00
parent 85d2d5bbee
commit 13c3a74afb
4 changed files with 89 additions and 26 deletions
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9
gdb/testsuite/ChangeLog
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@ -1,3 +1,12 @@
2020-02-28 Tom de Vries <tdevries@suse.de>
* gdb.base/c-linkage-name.c (main): Call do_something_other_cu.
(struct wrapper, do_something, mundane/symada__cS): Move ...
* gdb.base/c-linkage-name-2.c: ... here. New source file.
* gdb.base/c-linkage-name.exp: Add verification of psymtab expansion.
Update "print symada__cS before partial symtab expansion" regexp.
Update breakpoint location. Flush symbol cache after expansion.
2020-02-28 Luis Machado <luis.machado@linaro.org>
* gdb.arch/aarch64-pauth.exp: Recognize optional PAC output.

45
gdb/testsuite/gdb.base/c-linkage-name-2.c Normal file
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@ -0,0 +1,45 @@
/* This testcase is part of GDB, the GNU debugger.
Copyright 2018-2020 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/>. */
struct wrapper
{
int a;
};
/* Create a global variable whose name in the assembly code
(aka the "linkage name") is different from the name in
the source code. The goal is to create a symbol described
in DWARF using a DW_AT_linkage_name attribute, with a name
which follows the C++ mangling.
In this particular case, we chose "symada__cS" which, if it were
demangled, would translate to "symada (char, signed)". */
struct wrapper mundane asm ("symada__cS") = {0x060287af};
void
do_something (struct wrapper *w)
{
w->a++;
}
extern void do_something_other_cu (void);
void
do_something_other_cu (void)
{
do_something (&mundane);
}

23
gdb/testsuite/gdb.base/c-linkage-name.c
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@ -15,30 +15,11 @@
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
struct wrapper
{
int a;
};
/* Create a global variable whose name in the assembly code
(aka the "linkage name") is different from the name in
the source code. The goal is to create a symbol described
in DWARF using a DW_AT_linkage_name attribute, with a name
which follows the C++ mangling.
In this particular case, we chose "symada__cS" which, if it were
demangled, would translate to "symada (char, signed)". */
struct wrapper mundane asm ("symada__cS") = {0x060287af};
void
do_something (struct wrapper *w)
{
w->a++;
}
extern void do_something_other_cu (void);
int
main (void)
{
do_something (&mundane);
do_something_other_cu ();
return 0;
}

38
gdb/testsuite/gdb.base/c-linkage-name.exp
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@ -17,27 +17,55 @@
# gdb can correctly print arrays with indexes for each element of the
# array.
standard_testfile .c
standard_testfile c-linkage-name.c c-linkage-name-2.c
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
set sources "${srcdir}/${subdir}/${srcfile} ${srcdir}/${subdir}/${srcfile2}"
if { [gdb_compile "${sources}" "${binfile}" executable {debug}] != "" } {
untested "failed to compile"
return -1
}
clean_restart ${binfile}
# Verify that partial symtab expansion for $filename has state $readin
proc verify_psymtab_expanded { filename readin } {
set cmd "maint info psymtab"
set test "$cmd: $filename: $readin"
set re [multi_line \
" \{ psymtab \[^\r\n\]*$filename\[^\r\n\]*" \
" readin $readin" \
".*"]
gdb_test $cmd $re $test
}
# Verify that partial symtab expansion has not taken place for
# c-linkage-name-2.c.
verify_psymtab_expanded c-linkage-name-2.c no
# Try to print MUNDANE, but using its linkage name.
gdb_test "print symada__cS" \
" = {a = 100829103}" \
"'symada__cS' has unknown type; cast it to its declared type" \
"print symada__cS before partial symtab expansion"
# Force the symbols to be expanded for the unit that contains
# our symada__cS symbol by, e.g. inserting a breakpoint on one
# of the founction also provided by the same using.
gdb_test "break main" \
"Breakpoint $decimal at $hex: file .*$srcfile, line $decimal\\."
gdb_test "break do_something_other_cu" \
"Breakpoint $decimal at $hex: file .*$srcfile2, line $decimal\\."
# Verify that partial symtab expansion has taken place for
# c-linkage-name-2.c.
verify_psymtab_expanded c-linkage-name-2.c yes
# Flush the symbol cache to prevent the lookup to return the same as before.
gdb_test "maint flush-symbol-cache"
# Try to print MUNDANE using its linkage name again, after partial
# symtab expansion.