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compile: Use also inferior munmap

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Currently inferior memory is allocated by inferior mmap() but it is never
deallocated; despite the injected objfile incl. its symbols is freed.  This was
intentional so that one can do for example:
inferior:
	char *str = "foo";
GDB:
	(gdb) compile code str = "bar";

I believe later patches will be needed to introduce full control over keeping
vs. discarding the injected module as being discussed in:
	compile: objfiles lifetime UI
	https://sourceware.org/ml/gdb/2015-04/msg00051.html
	Message-ID: <20150429135735.GA16974@host1.jankratochvil.net>
	https://sourceware.org/ml/gdb/2015-05/msg00007.html

As decided by Phil it is better not to leak inferior pages as users can
workaround the issue above for example by:
	(gdb) compile code str = strdup ("bar");

I have checked that in fact gdb/doc/ (written by Phil) already expects the
injected code will be unmapped so that does not need to be changed:
	compile code int ff = 5; p = &ff;
	In this example, @code{p} would point to @code{ff} when the
	@code{compile} command is executing the source code provided to it.
	However, as variables in the (example) program persist with their
	assigned values, the variable @code{p} would point to an invalid
	location when the command exists.

gdb/ChangeLog
2015-04-28  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* arch-utils.c (default_infcall_munmap): New.
	* arch-utils.h (default_infcall_munmap): New declaration.
	* compile/compile-object-load.c (struct munmap_list, munmap_list_add)
	(munmap_list_free, munmap_listp_free_cleanup): New.
	(struct setup_sections_data): Add field munmap_list_headp.
	(setup_sections): Call munmap_list_add.
	(compile_object_load): New variable munmap_list_head, initialize
	setup_sections_data.munmap_list_headp, return munmap_list_head.
	* compile/compile-object-load.h (struct munmap_list): New declaration.
	(struct compile_module): Add field munmap_list_head.
	(munmap_list_free): New declaration.
	* compile/compile-object-run.c (struct do_module_cleanup): Add field
	munmap_list_head.
	(do_module_cleanup): Call munmap_list_free.
	(compile_object_run): Pass munmap_list_head to do_module_cleanup.
	* gdbarch.c: Regenerate.
	* gdbarch.h: Regenerate.
	* gdbarch.sh (infcall_munmap): New.
	* linux-tdep.c (linux_infcall_munmap): New.
	(linux_init_abi): Install it.

gdb/testsuite/ChangeLog
2015-04-28  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* gdb.compile/compile.exp (keep jit in memory): Rename to ...
	(do not keep jit in memory): ... this.
	(expect 5): Change it to ...
	(expect no 5): ... this.
This commit is contained in:
Jan Kratochvil 2015-06-03 21:22:56 +02:00
parent f277626b45
commit 7f36105668
12 changed files with 185 additions and 3 deletions
Download patch file Download diff file Expand all files Collapse all files

6
gdb/compile/compile-object-run.c
View file

@ -47,6 +47,9 @@ struct do_module_cleanup
struct type *out_value_type;
CORE_ADDR out_value_addr;
/* Copy from struct compile_module. */
struct munmap_list *munmap_list_head;
/* objfile_name of our objfile. */
char objfile_name_string[1];
};
@ -96,6 +99,8 @@ do_module_cleanup (void *arg, int registers_valid)
unlink (data->source_file);
xfree (data->source_file);
munmap_list_free (data->munmap_list_head);
/* Delete the .o file. */
unlink (data->objfile_name_string);
xfree (data);
@ -128,6 +133,7 @@ compile_object_run (struct compile_module *module)
data->scope_data = module->scope_data;
data->out_value_type = module->out_value_type;
data->out_value_addr = module->out_value_addr;
data->munmap_list_head = module->munmap_list_head;
xfree (module->source_file);
xfree (module);