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* breakpoint.c (bpstat_do_actions): To ensure that

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clear_proceed_status doesn't free the command tree we're
evaluating out from under us, zero the bpstat's pointer to it, and
take care of freeing it ourselves.
* cli/cli-script.c (make_cleanup_free_command_lines): Make this
function externally visible.
* cli/cli-script.h (make_cleanup_free_command_lines): New
declaration.
This commit is contained in:
Jim Blandy
2003-12-22 03:43:19 +00:00
parent c196818164
commit 6c50ab1c7f
4 changed files with 34 additions and 7 deletions
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23
gdb/breakpoint.c
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@@ -1992,7 +1992,6 @@ bpstat_do_actions (bpstat *bsp)
{
bpstat bs;
struct cleanup *old_chain;
struct command_line *cmd;
/* Avoid endless recursion if a `source' command is contained
in bs->commands. */
@@ -2017,7 +2016,23 @@ top:
breakpoint_proceeded = 0;
for (; bs != NULL; bs = bs->next)
{
struct command_line *cmd;
struct cleanup *this_cmd_tree_chain;
/* Take ownership of the BSP's command tree, if it has one.
The command tree could legitimately contain commands like
'step' and 'next', which call clear_proceed_status, which
frees stop_bpstat's command tree. To make sure this doesn't
free the tree we're executing out from under us, we need to
take ownership of the tree ourselves. Since a given bpstat's
commands are only executed once, we don't need to copy it; we
can clear the pointer in the bpstat, and make sure we free
the tree when we're done. */
cmd = bs->commands;
bs->commands = 0;
this_cmd_tree_chain = make_cleanup_free_command_lines (&cmd);
while (cmd != NULL)
{
execute_control_command (cmd);
@@ -2027,14 +2042,16 @@ top:
else
cmd = cmd->next;
}
/* We can free this command tree now. */
do_cleanups (this_cmd_tree_chain);
if (breakpoint_proceeded)
/* The inferior is proceeded by the command; bomb out now.
The bpstat chain has been blown away by wait_for_inferior.
But since execution has stopped again, there is a new bpstat
to look at, so start over. */
goto top;
else
free_command_lines (&bs->commands);
}
do_cleanups (old_chain);
}