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6d30ada87b
Andrew reported that the previous change to gdb.Inferior.read_memory & friends introducing scoped_restore_current_inferior_for_memory broke gdb.dap/stop-at-main.exp. This is also reported as PR dap/30644. The root of the problem is that all the methods that now use scoped_restore_current_inferior_for_memory cause GDB to crash with a failed assert if they are run on an inferior that is not yet started. E.g.: (gdb) python i = gdb.selected_inferior () (gdb) python i.read_memory (4,4) gdb/thread.c:626: internal-error: any_thread_of_inferior: Assertion `inf->pid != 0' failed. This patch fixes the problem by removing scoped_restore_current_inferior_for_memory's ctor ptid parameter and the any_thread_of_inferior calls completely, and making scoped_restore_current_inferior_for_memory switch inferior_ptid to a pid ptid. I was a little worried that some port might be assuming inferior_ptid points at a thread in the xfer_partial memory access routines. We know that anything that supports forks must not assume that, due to how detach_breakpoints works. I looked at a number of xfer_partial implementations, and didn't see anything that is looking at inferior_ptid in a way that would misbehave. I'm thinking that we could go forward with this and just fix ports if they break. While on some ports like on AMD GPU we have thread-specific address spaces, and so when accessing memory for those address spaces, we must have the right thread context (via inferior_ptid) selected, in Inferior.read_memory, we only have the inferior to work with, so this API as is can't be used to access thread-specific address spaces. IOW, it can only be used to access the global address space that is visible to both the CPU and the GPUs. In proc-service.c:ps_xfer_memory, the other spot using scoped_restore_current_inferior_for_memory, we're always accessing per-inferior memory. If we end up using scoped_restore_current_inferior_for_memory later to set up the context to read memory from a specific thread, then we can add an alternative ctor that takes a thread_info pointer, and make inferior_ptid point to the thread, for example. New test added to gdb.python/py-inferior.exp, exercising Inferior.read_memory without execution. No regressions on native and extended-gdbserver x86_64 GNU/Linux. Reviewed-By: Tom Tromey <tom@tromey.com> Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30644 Change-Id: I11309c5ddbbb51a4594cf63c21b3858bfd9aed19
433 lines
18 KiB
Plaintext
433 lines
18 KiB
Plaintext
# Copyright (C) 2009-2023 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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# This file is part of the GDB testsuite. It tests the mechanism
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# exposing inferiors to Python.
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load_lib gdb-python.exp
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require allow_python_tests
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standard_testfile
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if { [gdb_compile_pthreads ${srcdir}/${subdir}/${srcfile} ${binfile} executable {debug}] != "" } {
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return -1
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}
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# Start with a fresh gdb.
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clean_restart ${testfile}
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switch [get_endianness] {
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little { set python_pack_char "<" }
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big { set python_pack_char ">" }
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}
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# Test memory read operations without execution.
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gdb_py_test_silent_cmd "python addr = gdb.lookup_global_symbol ('int8_global').value().address" \
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"get global variable address" 0
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gdb_test "python \
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int8_global_mv = gdb.selected_inferior().read_memory (addr, 1); \
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print(int.from_bytes(int8_global_mv\[0\], byteorder='little'))" \
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"\r\n42" \
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"read memory without execution"
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# The following tests require execution.
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if {![runto_main]} {
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return 0
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}
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# The most recently added inferior.
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set most_recent_inf 1
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# A helper function that adds a new inferior. It returns the expected
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# number of the new inferior. ARG is a string to pass to
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# add-inferior.
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proc add_inferior {{arg ""}} {
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global most_recent_inf
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incr most_recent_inf
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gdb_test "add-inferior $arg" "Added inferior $most_recent_inf.*" \
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"add inferior $most_recent_inf"
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return $most_recent_inf
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}
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# Test basic gdb.Inferior attributes and methods.
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gdb_py_test_silent_cmd "python inferiors = gdb.inferiors ()" "get inferiors list" 1
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gdb_test "python print (inferiors)" \
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"\\(<gdb.Inferior num=1, pid=$decimal>,\\)" "verify inferiors list"
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gdb_py_test_silent_cmd "python i0 = inferiors\[0\]" "get first inferior" 0
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gdb_test "python print ('result = %s' % (i0 == inferiors\[0\]))" " = True" "test equality comparison (true)"
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gdb_test "python print ('result = %s' % i0.num)" " = \[0-9\]+" "test Inferior.num"
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gdb_test "python print ('result = %s' % i0.connection_num)" " = \[0-9\]+" "test Inferior.connection_num"
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gdb_test "python print ('result = %s' % (i0.connection_num == i0.connection.num))" " = True" \
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"Inferior.connection_num equals Inferior.connection.num"
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gdb_test "python print ('result = %s' % i0.pid)" " = \[0-9\]+" "test Inferior.pid"
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gdb_test "python print ('result = %s' % i0.was_attached)" " = False" "test Inferior.was_attached"
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gdb_test "python print (i0.threads ())" "\\(<gdb.InferiorThread object at 0x\[\[:xdigit:\]\]+>,\\)" "test Inferior.threads"
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gdb_test "python print (i0.progspace)" "<gdb.Progspace object at $hex>"
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gdb_test "python print (i0.progspace == gdb.progspaces()\[0\])" "True"
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# Test the number of inferior threads.
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gdb_breakpoint check_threads
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gdb_continue_to_breakpoint "cont to check_threads" ".*pthread_barrier_wait.*"
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gdb_test "python print (len (i0.threads ()))" "\r\n9" "test Inferior.threads 2"
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# Proceed to the next test.
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gdb_breakpoint [gdb_get_line_number "Break here."]
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gdb_continue_to_breakpoint "cont to Break here." ".*Break here\..*"
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# Test memory read and write operations.
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gdb_py_test_silent_cmd "python addr = gdb.selected_frame ().read_var ('str')" \
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"read str address" 0
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gdb_test "python astr = gdb.inferiors()\[0\].read_memory (addr, 5); print(astr)" \
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"<memory at $hex>" \
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"read str contents"
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gdb_test "python print(astr\[0\])" "b'h'"
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gdb_py_test_silent_cmd "python a = bytes('a', 'ascii')" "" 0
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gdb_py_test_silent_cmd "python astr\[1\] = a" "change str" 0
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gdb_py_test_silent_cmd "python gdb.inferiors()\[0\].write_memory (addr, astr)" \
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"write str" 1
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gdb_test "print str" " = \"hallo, testsuite\"" \
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"ensure str was changed in the inferior"
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# Add a new inferior here, so we can test that operations work on the
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# correct inferior.
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set num [add_inferior]
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# Test memory search.
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set hex_number {0x[0-9a-fA-F][0-9a-fA-F]*}
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set dec_number {[0-9]+}
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set history_prefix {[$][0-9]* = }
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set newline {[\r\n]+}
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set pattern_not_found "${newline}.None"
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set one_pattern_found "${newline}.${dec_number}"
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# Test string pattern.
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with_test_prefix "string" {
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gdb_test "set *(int32_t*) &int8_search_buf\[10\] = 0x61616161"
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gdb_test "py search_buf = gdb.selected_frame ().read_var ('int8_search_buf')"
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gdb_test_no_output "py start_addr = search_buf.address"
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gdb_test_no_output "py length = search_buf.type.sizeof"
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# Switch to the new inferior before testing.
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gdb_test "inferior $num" "Switching to inferior $num.*" \
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"switch to inferior $num"
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, length, 'aaa'))" \
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"${one_pattern_found}" "find string pattern"
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# Test not finding pattern because search range too small, with
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# potential find at the edge of the range.
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, 10+3, 'aaaa'))" \
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"${pattern_not_found}" "pattern not found at end of range"
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# Increase the search range by 1 and we should find the pattern.
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, 10+3+1, 'aaa'))" \
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"${one_pattern_found}" "pattern found at end of range"
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}
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# While still in the new inferior, test reading and writing memory
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# again.
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gdb_test "python astr = gdb.inferiors()\[0\].read_memory (addr, 5); print(astr)" \
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"<memory at $hex>" \
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"read str while other inferior selected"
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gdb_test "python print(astr\[1\])" "b'a'" \
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"print a character from the string"
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gdb_py_test_silent_cmd "python astr\[1\] = b'X'" "change str again" 0
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gdb_py_test_silent_cmd "python gdb.inferiors()\[0\].write_memory (addr, astr)" \
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"write str while other inferior selected" 1
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gdb_test "inferior 1" "Switching to inferior 1.*" "switch back to inferior 1"
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gdb_test "print str" " = \"hXllo, testsuite\"" \
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"ensure str was changed while other inferior selected"
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gdb_test_no_output "remove-inferiors $num" "remove-inferiors $num"
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# Import struct to pack the following patterns.
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gdb_test_no_output "py from struct import *"
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# Test 16-bit pattern.
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with_test_prefix "16-bit" {
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gdb_test_no_output "set int16_search_buf\[10\] = 0x1234"
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gdb_test_no_output "py search_buf = gdb.selected_frame ().read_var ('int16_search_buf')"
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gdb_test_no_output "py start_addr = search_buf.address"
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gdb_test_no_output "py length = search_buf.type.sizeof"
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gdb_test_no_output "py pattern = pack('${python_pack_char}H',0x1234)"
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, length, pattern))" \
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"${one_pattern_found}" "find 16-bit pattern, with value pattern"
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}
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# Test 32-bit pattern.
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with_test_prefix "32-bit" {
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gdb_test_no_output "set int32_search_buf\[10\] = 0x12345678"
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gdb_test_no_output "py search_buf = gdb.selected_frame ().read_var ('int32_search_buf')"
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gdb_test_no_output "py start_addr = search_buf.address"
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gdb_test_no_output "py length = search_buf.type.sizeof"
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gdb_test_no_output "py pattern = pack('${python_pack_char}I',0x12345678)"
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, length, pattern))" \
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"${one_pattern_found}" "find 32-bit pattern, with python pattern"
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}
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# Test 64-bit pattern.
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with_test_prefix "64-bit" {
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gdb_test_no_output "set int64_search_buf\[10\] = 0xfedcba9876543210LL"
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gdb_test_no_output "py search_buf = gdb.selected_frame ().read_var ('int64_search_buf')"
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gdb_test_no_output "py start_addr = search_buf.address"
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gdb_test_no_output "py length = search_buf.type.sizeof"
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gdb_test_no_output "py pattern = pack('${python_pack_char}Q', 0xfedcba9876543210)"
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, length, pattern))" \
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"${one_pattern_found}" "find 64-bit pattern, with value pattern"
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}
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# Test mixed-sized patterns.
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with_test_prefix "mixed-sized" {
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gdb_test_no_output "set *(int8_t*) &search_buf\[10\] = 0x62"
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gdb_test_no_output "set *(int16_t*) &search_buf\[11\] = 0x6363"
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gdb_test_no_output "set *(int32_t*) &search_buf\[13\] = 0x64646464"
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gdb_test_no_output "py search_buf = gdb.selected_frame ().read_var ('search_buf')"
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gdb_test_no_output "py start_addr = search_buf\[0\].address"
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gdb_test_no_output "py pattern1 = pack('B', 0x62)"
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gdb_test_no_output "py pattern2 = pack('${python_pack_char}H', 0x6363)"
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gdb_test_no_output "py pattern3 = pack('${python_pack_char}I', 0x64646464)"
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, 100, pattern1))" \
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"${one_pattern_found}" "find mixed-sized pattern 1"
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, 100, pattern2))" \
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"${one_pattern_found}" "find mixed-sized pattern 2"
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, 100, pattern3))" \
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"${one_pattern_found}" "find mixed-sized pattern 3"
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}
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# Test search spanning a large range, in the particular case of native
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# targets, test the search spanning multiple chunks.
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# Remote targets may implement the search differently.
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set CHUNK_SIZE 16000
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with_test_prefix "large range" {
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gdb_test_no_output "set *(int32_t*) &search_buf\[0*${CHUNK_SIZE}+100\] = 0x12345678"
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gdb_test_no_output "set *(int32_t*) &search_buf\[1*${CHUNK_SIZE}+100\] = 0x12345678"
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gdb_test_no_output "py start_addr = gdb.selected_frame ().read_var ('search_buf')"
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gdb_test_no_output "py end_addr = start_addr + gdb.selected_frame ().read_var ('search_buf_size')"
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gdb_test_no_output "py pattern = pack('${python_pack_char}I', 0x12345678)"
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gdb_test_no_output "py first = gdb.inferiors()\[0\].search_memory (start_addr,end_addr - start_addr, pattern)"
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gdb_test "py print (first)" "${one_pattern_found}" "search spanning large range 1st result"
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gdb_test_no_output "py start_addr = first + 1"
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gdb_test_no_output "py second = gdb.inferiors()\[0\].search_memory (start_addr, end_addr - start_addr, pattern)"
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gdb_test "py print (second)" "${one_pattern_found}" "search spanning large range 2nd result"
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gdb_test_no_output "py start_addr = second + 1"
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gdb_test_no_output "py third = gdb.inferiors()\[0\].search_memory (start_addr, end_addr - start_addr, pattern)"
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gdb_test "py print (third)" "${pattern_not_found}" "search spanning large range 3rd result"
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}
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# For native targets, test a pattern straddling a chunk boundary.
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if [isnative] {
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with_test_prefix "straddling" {
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gdb_test_no_output "set *(int32_t*) &search_buf\[${CHUNK_SIZE}-1\] = 0xfdb97531"
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gdb_test_no_output "py pattern = pack('${python_pack_char}I', 0xfdb97531)"
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gdb_test_no_output "py start_addr = gdb.selected_frame ().read_var ('search_buf')"
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gdb_test "py print (gdb.inferiors()\[0\].search_memory (start_addr, end_addr - start_addr, pattern))" \
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"${one_pattern_found}" "find pattern straddling chunk boundary"
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}
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}
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# Test Inferior is_valid.
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with_test_prefix "is_valid" {
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gdb_py_test_silent_cmd "python inf_list = gdb.inferiors()" "get initial list" 1
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gdb_test "python print (len(inf_list))" "1" "get inferior list length 1"
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gdb_test "python print (inf_list\[0\].is_valid())" "True" \
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"check inferior validity 1"
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# The "dummy" line below used to cause a gdb crash.
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gdb_test_multiline "install new inferior event handler" \
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"python" "" \
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"my_inferior_count = 1" "" \
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"def new_inf_handler(evt):" "" \
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" global my_inferior_count" "" \
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" if evt.inferior is not None:" "" \
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" my_inferior_count = my_inferior_count + 1" "" \
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" dummy = gdb.Value(True)" "" \
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"gdb.events.new_inferior.connect(new_inf_handler)" "" \
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"end" ""
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gdb_test_multiline "install inferior deleted event handler" \
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"python" "" \
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"def del_inf_handler(evt):" "" \
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" global my_inferior_count" "" \
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" if evt.inferior is not None:" "" \
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" my_inferior_count = my_inferior_count - 1" "" \
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"gdb.events.inferior_deleted.connect(del_inf_handler)" "" \
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"end" ""
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set num [add_inferior]
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gdb_py_test_silent_cmd "python inf_list = gdb.inferiors()" "get new list" 1
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gdb_test "python print (len(inf_list))" "2" "get inferior list length 2"
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gdb_test "python print (inf_list\[0\].is_valid())" "True" \
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"check inferior validity 2"
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gdb_test "python print (my_inferior_count)" "2" \
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"test new-inferior event handler"
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gdb_test "python print (inf_list\[1\].is_valid())" "True" \
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"check inferior validity 3"
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gdb_test_no_output "remove-inferiors $num"
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gdb_test "python print (inf_list\[0\].is_valid())" "True" \
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"check inferior validity 4"
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gdb_test "python print (inf_list\[1\].is_valid())" "False" \
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"check inferior validity 5"
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gdb_test "python print (my_inferior_count)" "1" \
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"test inferior-deleted event handler"
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# Test that other properties and methods handle the removed inferior
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# correctly.
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gdb_test "python print (inf_list\[1\].num)" \
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"RuntimeError: Inferior no longer exists.*"
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gdb_test "python print (inf_list\[1\].connection_num)" \
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"RuntimeError: Inferior no longer exists.*"
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gdb_test "python print (inf_list\[1\].connection)" \
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"RuntimeError: Inferior no longer exists.*"
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gdb_test "python print (inf_list\[1\].pid)" \
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"RuntimeError: Inferior no longer exists.*"
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gdb_test "python print (inf_list\[1\].was_attached)" \
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"RuntimeError: Inferior no longer exists.*"
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gdb_test "python print (inf_list\[1\].progspace)" \
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"RuntimeError: Inferior no longer exists.*"
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gdb_test "python print (inf_list\[1\].threads ())" \
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"RuntimeError: Inferior no longer exists.*"
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gdb_test "python print (inf_list\[1\].thread_from_thread_handle (1))" \
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"RuntimeError: Inferior no longer exists.*"
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}
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# Test gdb.selected_inferior()
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with_test_prefix "selected_inferior" {
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gdb_test "inferior 1" ".*" "switch to first inferior"
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gdb_test "py print (gdb.selected_inferior().num)" "1" "first inferior selected"
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gdb_test "py print (gdb.selected_inferior().connection_num)" "1" \
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"first inferior's connection number"
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gdb_test "py print (gdb.selected_inferior().connection.num)" "1" \
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"first inferior's connection number, though connection object"
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# Figure out if inf 1 has a native target.
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set inf_1_is_native [gdb_is_target_native]
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set num [add_inferior "-no-connection"]
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gdb_test "inferior $num" ".*" "switch to inferior $num"
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gdb_test "py print (gdb.selected_inferior().num)" "$num" \
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"inferior $num selected"
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gdb_test "py print (gdb.selected_inferior().connection_num)" "None" \
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"inferior $num's None connection number"
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gdb_test "py print (gdb.selected_inferior().connection)" "None" \
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|
"inferior $num's None connection"
|
|
gdb_test "target native" "Done. Use the \"run\" command to start a process." \
|
|
"target for inferior $num"
|
|
|
|
# If inf 1 has a native target, inf 3's target is shared with 1's.
|
|
# Otherwise, it must have created a new target with a new number.
|
|
if {$inf_1_is_native} {
|
|
set expected_connection_num 1
|
|
} else {
|
|
set expected_connection_num 2
|
|
}
|
|
gdb_test "py print (gdb.selected_inferior().connection_num)" \
|
|
"$expected_connection_num" \
|
|
"inferior $num's native connection number"
|
|
gdb_test "py print (gdb.selected_inferior().connection.num)" \
|
|
"$expected_connection_num" \
|
|
"inferior $num's native connection number, though connection object"
|
|
|
|
# Test printing of gdb.TargetConnection object.
|
|
gdb_test "py print (gdb.selected_inferior().connection)" \
|
|
"<gdb.TargetConnection num=${expected_connection_num}, what=\"\[^\"\]+\">" \
|
|
"print a connection object"
|
|
|
|
gdb_test "inferior 1" ".*" "switch back to first inferior"
|
|
gdb_test_no_output "remove-inferiors $num"
|
|
}
|
|
|
|
# Test repr()/str()
|
|
with_test_prefix "__repr__" {
|
|
set num [add_inferior]
|
|
gdb_py_test_silent_cmd "python infs = gdb.inferiors()" "get inferior list" 1
|
|
gdb_test "python print (infs\[0\])" "<gdb.Inferior num=1, pid=$decimal>"
|
|
gdb_test "python print (infs)" \
|
|
"\\\(<gdb.Inferior num=1, pid=$decimal>, <gdb.Inferior num=$num, pid=$decimal>\\\)" \
|
|
"print all inferiors 1"
|
|
gdb_test_no_output "remove-inferiors $num"
|
|
gdb_test "python print (infs)" \
|
|
"\\\(<gdb.Inferior num=1, pid=$decimal>, <gdb.Inferior \\\(invalid\\\)>\\\)" \
|
|
"print all inferiors 2"
|
|
}
|
|
|
|
# Test architecture.
|
|
with_test_prefix "architecture" {
|
|
gdb_test "inferior 1" ".*" "switch to first inferior"
|
|
gdb_test "python print(gdb.selected_frame().architecture() is gdb.selected_inferior().architecture())" \
|
|
"True" \
|
|
"inferior architecture matches frame architecture"
|
|
}
|
|
|
|
gdb_test "python print(gdb.selected_inferior().main_name)" \
|
|
"main" \
|
|
"print main name"
|
|
|
|
gdb_test_no_output "set args x y z"
|
|
gdb_test "python print(gdb.selected_inferior().arguments)" \
|
|
"x y z" \
|
|
"print arguments"
|
|
|
|
gdb_test_no_output "python gdb.selected_inferior().arguments = 'a b c'" \
|
|
"set arguments from string"
|
|
gdb_test "show args" \
|
|
[string_to_regexp "Argument list to give program being debugged when it is started is \"a b c\"."] \
|
|
"show args from string"
|
|
|
|
gdb_test_no_output "python gdb.selected_inferior().arguments = \['a', 'b c'\]" \
|
|
"set arguments from list"
|
|
gdb_test "show args" \
|
|
[string_to_regexp "Argument list to give program being debugged when it is started is \"a b\\ c\"."] \
|
|
"show args from list"
|
|
|
|
gdb_test_no_output "python gdb.selected_inferior().clear_env()" \
|
|
"clear environment"
|
|
gdb_test_no_output "show environment"
|
|
|
|
gdb_test_no_output "python gdb.selected_inferior().set_env('DEI', 'value')" \
|
|
"set environment variable"
|
|
gdb_test "show environment" \
|
|
"DEI=value" \
|
|
"examine environment variable"
|
|
|
|
gdb_test_no_output "python gdb.selected_inferior().unset_env('DEI')" \
|
|
"unset environment variable"
|
|
gdb_test_no_output "show environment" \
|
|
"environment is empty again"
|