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1 | # This testcase is part of GDB, the GNU debugger. |
2 | ||
3 | # Copyright 2010 Free Software Foundation, Inc. | |
4 | ||
5 | # This program is free software; you can redistribute it and/or modify | |
6 | # it under the terms of the GNU General Public License as published by | |
7 | # the Free Software Foundation; either version 3 of the License, or | |
8 | # (at your option) any later version. | |
9 | # | |
10 | # This program is distributed in the hope that it will be useful, | |
11 | # but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | # GNU General Public License for more details. | |
14 | # | |
15 | # You should have received a copy of the GNU General Public License | |
16 | # along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | ||
18 | # This file was written by Pedro Alves <pedro@codesourcery.com> | |
19 | ||
20 | # This file is part of the gdb testsuite. | |
21 | ||
22 | # | |
23 | # Tests involving read watchpoints, and other kinds of watchpoints | |
24 | # watching the same memory as read watchpoints. | |
25 | # | |
26 | ||
27 | set testfile "watch-read" | |
28 | set srcfile ${testfile}.c | |
29 | ||
30 | if { [target_info exists gdb,no_hardware_watchpoints] } { | |
31 | untested ${testfile}.exp | |
32 | return -1 | |
33 | } | |
34 | ||
35 | if { [prepare_for_testing ${testfile}.exp ${testfile} ${srcfile}] } { | |
36 | untested ${testfile}.exp | |
37 | return -1 | |
38 | } | |
39 | ||
40 | if { ![runto main] } then { | |
41 | fail "run to main" | |
42 | return | |
43 | } | |
44 | ||
45 | set read_line [gdb_get_line_number "read line" $srcfile] | |
46 | ||
47 | # Test running to a read of `global', with a read watchpoint set | |
48 | # watching it. | |
49 | ||
50 | gdb_test "rwatch global" \ | |
51 | "Hardware read watchpoint .*: global" \ | |
52 | "set hardware read watchpoint on global variable" | |
53 | ||
54 | # The first read is on entry to the loop. | |
55 | ||
56 | gdb_test "continue" \ | |
57 | "read watchpoint .*: global.*.*Value = 0.*in main.*$srcfile:$read_line.*" \ | |
58 | "read watchpoint triggers on first read" | |
59 | ||
60 | # The second read happens on second loop iteration, after `global' | |
61 | # having been incremented. On architectures where gdb has to emulate | |
62 | # read watchpoints with access watchpoints, this tests the | |
63 | # only-report-if-value-changed logic. On targets that support real | |
64 | # read watchpoints, this tests that GDB ignores the watchpoint's old | |
65 | # value, knowing that some untrapped write could have changed it, and | |
66 | # so reports the read watchpoint unconditionally. | |
67 | ||
68 | gdb_test "continue" \ | |
69 | "read watchpoint .*: global.*.*Value = 1.*in main.*$srcfile:$read_line.*" \ | |
70 | "read watchpoint triggers on read after value changed" | |
71 | ||
72 | # The following tests check that when the user sets a write or access | |
73 | # watchpoint watching the same memory as a read watchpoint, GDB also | |
74 | # applies the only-report-if-value-changed logic even on targets that | |
75 | # support real read watchpoints. | |
76 | ||
77 | # The program should be stopped at the read line. Set a write | |
78 | # watchpoint (leaving the read watchpoint) and continue. Only the | |
79 | # write watchpoint should be reported as triggering. | |
80 | ||
81 | gdb_test "watch global" \ | |
82 | "atchpoint .*: global" \ | |
83 | "set write watchpoint on global variable" | |
84 | ||
85 | gdb_test "continue" \ | |
86 | "atchpoint .*: global.*Old value = 1.*New value = 2.*" \ | |
87 | "write watchpoint triggers" | |
88 | ||
89 | set exp "" | |
90 | set exp "${exp}2.*read watchpoint.*keep y.*global.*breakpoint already hit 2 times.*" | |
91 | set exp "${exp}3.*watchpoint.*keep y.*global.*breakpoint already hit 1 time.*" | |
92 | gdb_test "info watchpoints" \ | |
93 | "$exp" \ | |
94 | "only write watchpoint triggers when value changes" | |
95 | ||
96 | # The program is now stopped at the write line. Continuing should | |
97 | # stop at the read line, and only the read watchpoint should be | |
98 | # reported as triggering. | |
99 | ||
100 | gdb_test "continue" \ | |
101 | "read watchpoint .*: global.*Value = 2.*in main.*$srcfile:$read_line.*" \ | |
102 | "read watchpoint triggers when value doesn't change, trapping reads and writes" | |
103 | ||
104 | set exp "" | |
105 | set exp "${exp}2.*read watchpoint.*keep y.*global.*breakpoint already hit 3 times.*" | |
106 | set exp "${exp}3.*watchpoint.*keep y.*global.*breakpoint already hit 1 time.*" | |
107 | gdb_test "info watchpoints" \ | |
108 | "$exp" \ | |
109 | "only read watchpoint triggers when value doesn't change" |