c56e7c4390
This patch adjusts the testing strategy used in a couple of testcases
where we are trying to print the value of a global variable defined
at multiple locations. The problem is that the actual value depends
on the platform. So instead of hard-coding the expected value in
the testcase script, we use local variables (in the inferior) holding
the correct value, and we compare the global variable's value with
the local variable's value.
gdb/testsuite/ChangeLog:
* gdb.base/ctxobj-f.c (GET_VERSION): Introduce local variable
and add comment.
* gdb.base/ctxobj-m.c (main): Rewrite, and add comment.
* gdb.base/ctxobj.exp: Insert breakpoint in ctxobj-f.c using
"STOP" marker. Adjust testing strategy to make it work on
all targets.
* gdb.base/print-file-var-main.c (main): Rewrite using local
variables and adjust get_version_2's return value check.
Add small comment.
* gdb.base/print-file-var.exp: Insert breakpoint using "STOP"
marker. Adjust testing strategy to make it work on all targets.
109 lines
4.1 KiB
Text
109 lines
4.1 KiB
Text
# Copyright 2012 Free Software Foundation, Inc.
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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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#
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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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#
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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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set executable ctxobj-m
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# The sources used to build two shared libraries (SO). We use the exact
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# same sources to build both SOs, but differentiate them through the use
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# of macros defined when calling the compiler.
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#
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# We need two source files per SO, because we need to test the situation
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# where we are trying to print the value of a global variable defined
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# in that SO while the variable's associated symtab has not been created
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# yet.
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set libsrc [list "${srcdir}/${subdir}/ctxobj-v.c" \
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"${srcdir}/${subdir}/ctxobj-f.c"]
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set libobj1 "${objdir}/${subdir}/libctxobj1.so"
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set libobj2 "${objdir}/${subdir}/libctxobj2.so"
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set libobj1_opts { debug additional_flags=-fPIC
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additional_flags=-DVERSION=104
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additional_flags=-DGET_VERSION=get_version_1 }
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set libobj2_opts { debug additional_flags=-fPIC
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additional_flags=-DVERSION=203
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additional_flags=-DGET_VERSION=get_version_2 }
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if { [gdb_compile_shlib $libsrc $libobj1 $libobj1_opts ] != "" } {
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return -1
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}
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if { [gdb_compile_shlib $libsrc $libobj2 $libobj2_opts ] != "" } {
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return -1
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}
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if { [gdb_compile "${srcdir}/${subdir}/${executable}.c" \
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"${objdir}/${subdir}/${executable}" \
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executable \
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[list debug shlib=${libobj1} shlib=${libobj2}]]
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!= ""} {
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return -1
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}
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clean_restart $executable
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if ![runto_main] {
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untested "could not run to main"
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return -1
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}
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set bp_location [gdb_get_line_number "STOP" "ctxobj-f.c"]
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gdb_test "break ctxobj-f.c:$bp_location" \
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"Breakpoint \[0-9\]+ at 0x\[0-9a-fA-F\]+: .*" \
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"break in get_version functions"
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gdb_test "continue" \
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"Breakpoint $decimal, get_version_1 \\(\\).*" \
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"continue to get_version_1"
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# Try printing "this_version_num". There are two global variables
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# with that name, and some systems such as GNU/Linux merge them
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# into one single entity, while some other systems such as Windows
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# keep them separate. In the first situation, we have to verify
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# that GDB does not randomly select the wrong instance. And in
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# the second case, we have to verify that GDB prints the value
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# of the instance from the current debugging context (the shared
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# library currently being debugged).
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#
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# We perform two tests: The first print test verifies that we are
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# doing things right when the partial symtab hasn't been expanded.
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# And the second print test will do the same, but after the partial
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# symtab has been expanded.
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#
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# To avoid adding target-specific code in this testcase, the program
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# sets a local variable named 'v' with the value of the global
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# variable 'this_version_number'. This allows us to compare the value
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# that GDB thinks 'this_version_num' has, against the actual value
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# seen by the program itself.
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gdb_test "print this_version_num == v" \
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" = 1" \
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"print libctxobj1's this_version_num from partial symtab"
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gdb_test "print this_version_num == v" \
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" = 1" \
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"print libctxobj1's this_version_num from symtab"
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# Do the same, but from get_version_2.
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gdb_test "continue" \
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"Breakpoint $decimal, get_version_2 \\(\\).*" \
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"continue to get_version_2"
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gdb_test "print this_version_num == v" \
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" = 1" \
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"print libctxobj2's this_version_num from partial symtab"
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gdb_test "print this_version_num == v" \
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" = 1" \
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"print libctxobj2's this_version_num from symtab"
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