From b65b566cdcb577edb57616c5b49a2f245b56325c Mon Sep 17 00:00:00 2001 From: Philippe Waroquiers Date: Sun, 23 Jun 2019 15:34:15 +0200 Subject: [PATCH] Fix alias command not detecting non matching prefix & sometimes asserting. alias_command does not detect that the prefixes of the alias command and the aliased command are not matching: it is comparing the alias prefix with itself, instead of comparing it with the aliased command prefix. This causes either the alias command to silently do nothing, or to have GDB asserting: (gdb) alias assigne imprime limite-elements = set print elements ../../binutils-gdb/gdb/cli/cli-cmds.c:1552: internal-error: void alias_command(const char*, int): Assertion `c_command != NULL && c_command != (struct cmd_list_element *) -1' failed. A problem internal to GDB has been detected, Fix the logic, and update gdb.base/alias.exp to test these cases. gdb/ChangeLog 2019-06-25 Philippe Waroquiers * cli/cli-cmds.c (alias_command): Compare the alias prefix with the command prefix. gdb/testsuite/ChangeLog 2019-06-25 Philippe Waroquiers * gdb.base/alias.exp: Test non matching/non existing prefixes. --- gdb/ChangeLog | 5 ++++ gdb/cli/cli-cmds.c | 9 +++--- gdb/testsuite/ChangeLog | 4 +++ gdb/testsuite/gdb.base/alias.exp | 50 ++++++++++++++++++++++++++++++++ 4 files changed, 64 insertions(+), 4 deletions(-) diff --git a/gdb/ChangeLog b/gdb/ChangeLog index ff05c1ccbe7..64656d6fc30 100644 --- a/gdb/ChangeLog +++ b/gdb/ChangeLog @@ -1,3 +1,8 @@ +2019-06-25 Philippe Waroquiers + + * cli/cli-cmds.c (alias_command): Compare the alias prefix + with the command prefix. + 2019-06-25 Tom Tromey * tui/tui-wingeneral.c (tui_delete_win): Remove "return". diff --git a/gdb/cli/cli-cmds.c b/gdb/cli/cli-cmds.c index 62f4d7f0c5e..5124ab3f1b2 100644 --- a/gdb/cli/cli-cmds.c +++ b/gdb/cli/cli-cmds.c @@ -1518,8 +1518,8 @@ alias_command (const char *args, int from_tty) Example: alias spe = set print elements Otherwise ALIAS and COMMAND must have the same number of words, - and every word except the last must match; and the last word of - ALIAS is made an alias of the last word of COMMAND. + and every word except the last must identify the same prefix command; + and the last word of ALIAS is made an alias of the last word of COMMAND. Example: alias set print elms = set pr elem Note that unambiguous abbreviations are allowed. */ @@ -1538,10 +1538,11 @@ alias_command (const char *args, int from_tty) error (_("Mismatched command length between ALIAS and COMMAND.")); /* Create copies of ALIAS and COMMAND without the last word, - and use that to verify the leading elements match. */ + and use that to verify the leading elements give the same + prefix command. */ std::string alias_prefix_string (argv_to_string (alias_argv, alias_argc - 1)); - std::string command_prefix_string (argv_to_string (alias_argv, + std::string command_prefix_string (argv_to_string (command_argv.get (), command_argc - 1)); alias_prefix = alias_prefix_string.c_str (); command_prefix = command_prefix_string.c_str (); diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog index f0e05d3a3c5..8410a090d71 100644 --- a/gdb/testsuite/ChangeLog +++ b/gdb/testsuite/ChangeLog @@ -1,3 +1,7 @@ +2019-06-23 Philippe Waroquiers + + * gdb.base/alias.exp: Test non matching/non existing prefixes. + 2019-06-25 Tom de Vries PR testsuite/24727 diff --git a/gdb/testsuite/gdb.base/alias.exp b/gdb/testsuite/gdb.base/alias.exp index fe4eb44cd0a..20722e5dea0 100644 --- a/gdb/testsuite/gdb.base/alias.exp +++ b/gdb/testsuite/gdb.base/alias.exp @@ -66,3 +66,53 @@ gdb_test_no_output "alias set pr elms = set p elem" gdb_test_no_output "set pr elms 51" gdb_test "show print elements" "Limit .* is 51\[.\]" "verify set pr elms" gdb_test "help set print" "set print elms .*" + +# Verify alias command detects a non existing prefix. +gdb_test "alias assigne imprime limite-elements = set print elements" \ + "ALIAS and COMMAND prefixes do not match\." \ + "assigne imprime prefix not defined" + +gdb_test "alias set imprime limite-elements = set print elements" \ + "ALIAS and COMMAND prefixes do not match\." \ + "set imprime prefix not defined" + +# Verify alias command detects a non matching prefix. +gdb_test "alias set ada limite-elements = set print elements" \ + "ALIAS and COMMAND prefixes do not match\." \ + "mismatched prefix" + +# Verify alias command detects a non matching prefix due to length. +gdb_test "alias set imprime-limite-elements = set print elements" \ + "Mismatched command length between ALIAS and COMMAND\." \ + "mismatched length" + + +# Gradually define the prefixes and the limite-elements command. +gdb_test_no_output "alias assigne = set" "alias assigne" +gdb_test_no_output "alias assigne imprime = set print" "alias assigne imprime" +gdb_test_no_output "alias assigne imprime limite-elements = set print elements" \ + "alias assigne imprime limite-elements" + +# Define an alias using the command prefix with a command using an alias prefix. +gdb_test_no_output "alias set print max-elements = assigne imprime elements" \ + "alias set print max-elements using assigne imprime" + + +# Tests the resulting prefixes and commands. +gdb_test_no_output "assigne print elements 52" +gdb_test "show print elements" "Limit .* is 52\[.\]" "verify 52" + +gdb_test_no_output "assigne imprime elements 53" +gdb_test "show print elements" "Limit .* is 53\[.\]" "verify 53" + +gdb_test_no_output "assigne imprime limite-elements 54" +gdb_test "show print elements" "Limit .* is 54\[.\]" "verify 54" + +gdb_test_no_output "set imprime elements 55" +gdb_test "show print elements" "Limit .* is 55\[.\]" "verify 55" + +gdb_test_no_output "set print limite-elements 56" +gdb_test "show print elements" "Limit .* is 56\[.\]" "verify 56" + +gdb_test_no_output "set print max-elements 57" +gdb_test "show print elements" "Limit .* is 57\[.\]" "verify 57" -- 2.30.2