watchpoint.exp

这个是LINUX下的GDB调度工具的源码

# Copyright 1992, 1994, 1995, 1996, 1997, 1998, 1999, 2000
# 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 2 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, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  

# Please email any bugs, comments, and/or additions to this file to:
# [e-mail]

# This file was written by Fred Fish. ([e-mail])

if $tracelevel then {
    strace $tracelevel
}

set prms_id 0
set bug_id 0

set testfile "watchpoint"
set srcfile ${testfile}.c
set binfile ${objdir}/${subdir}/${testfile}

set wp_set 1

if [get_compiler_info ${binfile}] {
    return -1
}

if  { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
     gdb_suppress_entire_file "Testcase compile failed, so all tests in this file will automatically fail."
}

# Prepare for watchpoint tests by setting up two breakpoints and one
# watchpoint.
#
# We use breakpoints at marker functions to get past all the startup code,
# so we can get to the watchpoints in a reasonable amount of time from a
# known starting point.
#
# For simplicity, so we always know how to reference specific breakpoints or
# watchpoints by number, we expect a particular ordering and numbering of
# each in the combined breakpoint/watchpoint table, as follows:
#
#	Number		What		Where
#	1		Breakpoint	marker1()
#	2		Breakpoint	marker2()
#	3		Watchpoint	ival3

proc initialize {} {
    global gdb_prompt
    global hex
    global decimal
    global srcfile
    global wp_set

    # Disable hardware watchpoints if necessary.
    if [target_info exists gdb,no_hardware_watchpoints] {
	gdb_test "set can-use-hw-watchpoints 0" "" ""
    }

    if [gdb_test "break marker1" "Breakpoint 1 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker1" ] { 
      return 0; 
    }


    if [gdb_test "break marker2" "Breakpoint 2 at $hex: file .*$srcfile, line $decimal.*" "set breakpoint at marker2" ] { 
      return 0; 
    }


    if [gdb_test "info break" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*" "info break in watchpoint.exp" ] { 
      return 0; 
    }


    # ??rehrauer: To fix DTS #CHFts23014, in which setting a watchpoint
    # before running can cause the inferior to croak on HP-UX 11.0 for
    # reasons yet unknown, we've disabled the ability to set watches
    # without a running inferior.  Verify the restriction. 
    #
    send_gdb "watch ival3\n"
    gdb_expect {
        -re ".*\[Ww\]atchpoint 3: ival3.*$gdb_prompt $" {
            pass "set watchpoint on ival3"
        }
        -re "warning: can't do that without a running program; try \"break main\", \"run\" first.*$gdb_prompt $" {
            pass "set watchpoint on ival3"
            set wp_set 0
            return 1
        }
        timeout {
            fail "(timeout) set watchpoint on ival3"
            return 0
        }
    }

    # "info watch" is the same as "info break"

    if [gdb_test "info watch" "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3" "watchpoint found in watchpoint/breakpoint table" ] { 
      return 0; 
    }


    # After installing the watchpoint, we disable it until we are ready
    # to use it.  This allows the test program to run at full speed until
    # we get to the first marker function.

    if [gdb_test "disable 3" "disable 3\[\r\n\]+" "disable watchpoint" ] { 
      return 0; 
    }


    return 1
}

#
# Test simple watchpoint.
#

proc test_simple_watchpoint {} {
    global gdb_prompt
    global hex
    global decimal
    global wp_set

    # Ensure that the watchpoint is disabled when we startup.

    if { $wp_set } {
        if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_simple_watchpoint" ] { 
	    return 0; 
	}
    }


    # Run until we get to the first marker function.

    gdb_run_cmd
    set timeout 600
    gdb_expect {
	-re "Breakpoint 1, marker1 .*$gdb_prompt $" {
	    pass "run to marker1 in test_simple_watchpoint"
	}
	-re ".*$gdb_prompt $" {
	    fail "run to marker1 in test_simple_watchpoint"
	    return
	}
	timeout {
	    fail "run to marker1 in test_simple_watchpoint (timeout)"
	    return
	}
    }

    if { !$wp_set } {
	# ??rehrauer: To fix DTS #CHFts23014, in which setting a watchpoint
	# before running can cause the inferior to croak on HP-UX 11.0
	# for reasons yet unknown, we've disabled the ability to set 
	# watches without a running inferior.  The following testpoints used
	# to be in [initialize].
	#
	send_gdb "watch ival3\n"
	gdb_expect {
	    -re ".*\[Ww\]atchpoint 3: ival3\r\n$gdb_prompt $" { 
	        pass "set watchpoint on ival3"
	    }
	    -re ".*$gdb_prompt $" { fail "set watchpoint on ival3"  }
	    timeout { fail "set watchpoint on ival3 (timeout)"  }
	}

        set wp_set 1

	# "info watch" is the same as "info break"

	send_gdb "info watch\n"
	gdb_expect {
	    -re "1\[ \]*breakpoint.*marker1.*\r\n2\[ \]*breakpoint.*marker2.*\r\n3\[ \]*.*watchpoint.*ival3\r\n$gdb_prompt $" {
	        pass "watchpoint found in watchpoint/breakpoint table"
	    }
	    -re ".*$gdb_prompt $" {
	        fail "watchpoint found in watchpoint/breakpoint table"
	    }
	    timeout {
	       fail "watchpoint found in watchpoint/breakpoint table"
	    }
	}

	# After installing the watchpoint, we disable it until we are ready
	# to use it.  This allows the test program to run at full speed until
	# we get to the first marker function.

	send_gdb "disable 3\n"
	gdb_expect {
	    -re "disable 3\[\r\n\]+$gdb_prompt $" { pass "disable watchpoint" }
	    -re ".*$gdb_prompt $" { fail "disable watchpoint"  }
	    timeout { fail "disable watchpoint (timeout)"  }
	}
    }

    # After reaching the marker function, enable the watchpoint.

    if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "enable watchpoint" ] { 
      return ; 
    }


    gdb_test "break func1" "Breakpoint.*at.*"
    gdb_test "set \$func1_breakpoint_number = \$bpnum" ""

    gdb_test "continue" "Continuing.*Breakpoint \[0-9\]*, func1.*" \
	"continue to breakpoint at func1"

    # Continue until the first change, from -1 to 0

    send_gdb "cont\n"
    gdb_expect {
	-re "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count; ival4 = count;.*$gdb_prompt $" {
	    pass "watchpoint hit, first time"
	}
	-re "Continuing.*Breakpoint.*func1.*$gdb_prompt $" {
	    setup_xfail "m68*-*-*" 2597
	    fail "thought it hit breakpoint at func1 twice"
	    gdb_test "delete \$func1_breakpoint_number" ""
	    gdb_test "continue" "\
Continuing.*\[Ww\]atchpoint.*ival3.*Old value = -1.*New value = 0.*ival3 = count;" \
		"watchpoint hit, first time"
	}
	-re ".*$gdb_prompt $" { fail "watchpoint hit, first time" ; return }
	timeout { fail "watchpoint hit, first time (timeout)" ; return }
	eof { fail "watchpoint hit, first time (eof)" ; return }
    }

    # Check that the hit count is reported correctly
    gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 1 time.*" "Watchpoint hit count is 1"

    gdb_test "delete \$func1_breakpoint_number" ""

    # Continue until the next change, from 0 to 1.
    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit, second time"

    # Check that the hit count is reported correctly
    gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 2 times.*" "Watchpoint hit count is 2"

    # Continue until the next change, from 1 to 2.
    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 1.*New value = 2.*ival3 = count; ival4 = count;.*" "watchpoint hit, third time"

    # Check that the hit count is reported correctly
    gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 3 times.*" "Watchpoint hit count is 3"
    
    # Continue until the next change, from 2 to 3.
    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 2.*New value = 3.*ival3 = count; ival4 = count;.*" "watchpoint hit, fourth time"

    # Check that the hit count is reported correctly
    gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 4 times.*" "Watchpoint hit count is 4"

    # Continue until the next change, from 3 to 4.
    # Note that this one is outside the loop.

    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 3.*New value = 4.*ival3 = count; ival4 = count;.*" "watchpoint hit, fifth time"

    # Check that the hit count is reported correctly
    gdb_test "info break" ".*watchpoint\[ \t\]+keep\[ \t\]+y\[ \t\]+ival3\r\n\[ \t]+breakpoint already hit 5 times.*" "Watchpoint hit count is 5"

    # Continue until we hit the finishing marker function.
    # Make sure we hit no more watchpoints.

    gdb_test "cont" "Continuing.*Breakpoint.*marker2 \(\).*" \
	"continue to marker2"

    # Disable the watchpoint so we run at full speed until we exit.

    if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "watchpoint disabled" ] { 
      return ; 
    }


    # Run until process exits.

    if [target_info exists gdb,noresults] { return }

    gdb_continue_to_end "continue to exit in test_simple_watchpoint"
}

# Test disabling watchpoints.

proc test_disabling_watchpoints {} {
    global gdb_prompt
    global binfile
    global srcfile
    global decimal
    global hex

    # "info watch" is the same as "info break"
    gdb_test "info watch" "\[0-9\]+\[ \]*breakpoint.*marker1.*\r\n\[0-9\]+\[ \]*breakpoint.*marker2.*\r\n\[0-9]+\[ \]*.*watchpoint.*ival3\r\n\.*\[0-9\]+ times.*" "watchpoints found in watchpoint/breakpoint table"

    # Ensure that the watchpoint is disabled when we startup.

    if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint in test_disabling_watchpoints" ] { 
      return 0; 
    }


    # Run until we get to the first marker function.

    gdb_run_cmd
    set timeout 600
    gdb_expect {
	-re "Breakpoint 1, marker1 .*$gdb_prompt $" {
	    pass "run to marker1 in test_disabling_watchpoints"
	}
	-re ".*$gdb_prompt $" {
	    fail "run to marker1 in test_disabling_watchpoints"
	    return
	}
	timeout {
	    fail "run to marker1 in test_disabling_watchpoints (timeout)"
	    return
	}
    }

    # After reaching the marker function, enable the watchpoint.

    if [gdb_test "enable 3" "^enable 3\[\r\n\]+" "watchpoint enabled" ] { 
      return ; 
    }


    # Continue until the first change, from -1 to 0
    # Don't check the old value, because on VxWorks the variable value
    # will not have been reinitialized.
    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = .*New value = 0.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, first time"
    
    # Continue until the next change, from 0 to 1.
    gdb_test "cont" "Continuing.*\[Ww\]atchpoint.*ival3.*Old value = 0.*New value = 1.*ival3 = count; ival4 = count;.*" "watchpoint hit in test_disabling_watchpoints, second time"
    
    # Disable the watchpoint but leave breakpoints

    if [gdb_test "disable 3" "^disable 3\[\r\n\]+" "disable watchpoint #2 in test_disabling_watchpoints" ] { 
      return 0; 
    }


    # Check watchpoint list, looking for the entry that confirms the
    # watchpoint is disabled.
    gdb_test "info watchpoints" "\[0-9]+\[ \]*.*watchpoint\[ \]*keep\[ \]*n\[ \]*ival3\r\n.*" "watchpoint disabled in table"

    # Continue until we hit the finishing marker function.
    # Make sure we hit no more watchpoints.
    gdb_test "cont" "Continuing.*Breakpoint.*marker2 \\(\\).*" \
	"disabled watchpoint skipped"
    
    if [target_info exists gdb,noresults] { return }

    gdb_continue_to_end "continue to exit in test_disabling_watchpoints"
}

# Test stepping and other mundane operations with watchpoints enabled
proc test_stepping {} {
    global gdb_prompt

    if [runto marker1] then {
	gdb_test "watch ival2" ".*\[Ww\]atchpoint \[0-9\]*: ival2"

	# Well, let's not be too mundane.  It should be a *bit* of a challenge
	gdb_test "break func2 if 0" "Breakpoint.*at.*"
	gdb_test "p \$func2_breakpoint_number = \$bpnum" " = .*"

	gdb_test "p func1 ()" "= 73" \
	    "calling function with watchpoint enabled"

	# 
	# "finish" brings us back to main.
	# On some targets (e.g. alpha) gdb will stop from the finish in midline
	# of the marker1 call. This is due to register restoring code on
	# the alpha and might be caused by stack adjustment instructions
	# on other targets. In this case we will step once more.
	#

	send_gdb "finish\n"
	gdb_expect {
	    -re "Run.*exit from.*marker1.* at" {
		pass "finish from marker1"
	    }
	    default { fail "finish from marker1 (timeout)" ; return }
	}

	gdb_expect {
	    -re "marker1 \\(\\);.*$gdb_prompt $" {
		send_gdb "step\n"
		exp_continue
	    }
	    -re "func1 \\(\\);.*$gdb_prompt $" {
		pass "back at main from marker1"
	    }
	    -re ".*$gdb_prompt $" {
		fail "back at main from marker1"
	    }
	    default { fail "back at main from marker1 (timeout)" ; return }
	}