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|
# This testcase is part of GDB, the GNU debugger.
# Copyright 1997-2019 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/>. */
# step-test.exp -- Expect script to test stepping in gdb
standard_testfile .c
remote_exec build "rm -f ${binfile}"
if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
untested "failed to compile"
return -1
}
clean_restart ${binfile}
if ![runto_main] then {
fail "can't run to main"
return 0
}
# Set a breakpoint at line 45, if stepi then finish fails, we would
# run to the end of the program, which would mess up the rest of the tests.
# Vanilla step/next
#
gdb_test "next" ".*${decimal}.*x = 1;.*" "next 1"
gdb_test "step" ".*${decimal}.*y = 2;.*" "step 1"
# With count
#
gdb_test "next 2" ".*${decimal}.*w = w.*2;.*" "next 2"
gdb_test "step 3" ".*${decimal}.*z = z.*5;.*" "step 3"
gdb_test "next" ".*${decimal}.*callee.*OVER.*" "next 3"
# Step over call
#
gdb_test "next" ".*${decimal}.*callee.*INTO.*" "next over"
# Step into call
#
gdb_test "step" ".*${decimal}.*myglob.*" "step into"
# Step out of call
#
# I wonder if this is really portable. Are there any caller-saves
# platforms, on which `finish' will return you to some kind of pop
# instruction, which is attributed to the line containing the function
# call?
# On PA64, we end up at a different instruction than PA32.
# On IA-64, we also end up on callee instead of on the next line due
# to the restoration of the global pointer (which is a caller-save).
# Similarly on MIPS PIC targets.
set test "step out"
if { [istarget "ia64-*-*"] || [istarget "mips*-*-*"]} {
gdb_test_multiple "finish" "$test" {
-re ".*${decimal}.*a.*5.*= a.*3.*$gdb_prompt $" {
pass "$test"
}
-re ".*${decimal}.*callee.*INTO.*$gdb_prompt $" {
pass "$test"
}
}
} else {
gdb_test "finish" ".*${decimal}.*a.*5.*= a.*3.*" "step out"
}
### Testing nexti and stepi.
###
### test_i NAME COMMAND HERE THERE
###
### Send COMMAND to gdb over and over, while the output matches the
### regexp HERE, followed by the gdb prompt. Pass if the output
### eventually matches the regexp THERE, followed by the gdb prompt;
### fail if we have to iterate more than a hundred times, we time out
### talking to gdb, or we get output which is neither HERE nor THERE. :)
###
### Use NAME as the name of the test.
###
### The exact regexps used are "$HERE.*$gdb_prompt $"
### and "$THERE.*$gdb_prompt $"
###
proc test_i {name command here there} {
global gdb_prompt
set i 0
gdb_test_multiple "$command" "$name" {
-re "$here.*$gdb_prompt $" {
# Have we gone for too many steps without seeing any progress?
if {[incr i] >= 100} {
fail "$name (no progress after 100 steps)"
return
}
send_gdb "$command\n"
exp_continue
}
-re "$there.*$gdb_prompt $" {
# We've reached the next line. Rah.
pass "$name"
return
}
}
}
test_i "stepi to next line" "stepi" \
".*${decimal}.*a.*5.* = a.*3" \
".*${decimal}.*callee.*STEPI"
# Continue to step until we enter the function. Also keep stepping
# if this passes through a (useless) PLT entry.
test_i "stepi into function" "stepi" \
"(.*${decimal}.*callee.*STEPI|.* in callee@plt)" \
".*callee \\(\\) at .*step-test\\.c"
# Continue to step until we reach the function's body. This makes it
# more likely that we've actually completed the prologue, so "finish"
# will work.
test_i "stepi into function's first source line" "stepi" \
".*${decimal}.*int callee" \
".*${decimal}.*myglob.*; return 0;"
# Have to be careful here, if the finish does not work,
# then we may run to the end of the program, which
# will cause erroneous failures in the rest of the tests
set test "stepi: finish call"
gdb_test_multiple "finish" "$test" {
-re ".*${decimal}.*callee.*NEXTI.*$gdb_prompt $" {
pass "$test"
}
-re ".*(Program received|$inferior_exited_re).*$gdb_prompt $" {
# Oops... We ran to the end of the program... Better reset
if {![runto_main]} then {
fail "$test (Can't run to main)"
return 0
}
if {![runto step-test.c:45]} {
fail "$test (Can't run to line 45)"
return 0
}
fail "$test"
}
-re ".*${decimal}.*callee.*STEPI.*$gdb_prompt $" {
# On PA64, we end up at a different instruction than PA32.
# On IA-64, we end up on callee instead of on the following line due
# to the restoration of the global pointer.
# Similarly on MIPS PIC targets.
if { [istarget "ia64-*-*"] || [istarget "mips*-*-*"] } {
test_i "$test" "stepi" \
".*${decimal}.*callee.*STEPI" ".*${decimal}.*callee.*NEXTI"
} else {
fail "$test"
}
}
}
test_i "nexti over function" "nexti" \
".*${decimal}.*callee.*NEXTI" \
".*${decimal}.*y = w \\+ z;"
# On some platforms, if we try to step into a function call that
# passes a large structure by value, then we actually end up stepping
# into memcpy, bcopy, or some such --- GCC emits the call to pass the
# argument. Opinion is bitterly divided about whether this is the
# right behavior for GDB or not, but we'll catch it here, so folks
# won't forget about it.
# Update 4/4/2002 - Regardless of which opinion you have, you would
# probably have to agree that gdb is currently behaving as designed,
# in the absence of additional code to not stop in functions used
# internally by the compiler. Since the testsuite should be checking
# for conformance to the design, the correct behavior is to accept the
# cases where gdb stops in memcpy/bcopy.
gdb_test \
"break [gdb_get_line_number "step-test.exp: large struct by value"]" \
".*Breakpoint.* at .*" \
"set breakpoint at call to large_struct_by_value"
gdb_test "continue" \
".*Breakpoint ${decimal},.*large_struct_by_value.*" \
"run to pass large struct"
set test "large struct by value"
gdb_test_multiple "step" "$test" {
-re ".*step-test.exp: arrive here 1.*$gdb_prompt $" {
pass "$test"
}
-re ".*(memcpy|bcopy).*$gdb_prompt $" {
send_gdb "finish\n" ; gdb_expect -re "$gdb_prompt $"
send_gdb "step\n"
exp_continue
}
}
gdb_continue_to_end "step-test.exp"
return 0
|
