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Use gdbarch obstack to allocate types in alloc_type_arch 

For the command "gdb gdb" valgrind currently reports 100s of individual
memory leaks, 500 of which originate solely out of the function
alloc_type_arch.  This function allocates a "struct type" associated
with the given gdbarch using malloc but apparently the types allocated
by this function are never freed.

This patch fixes these leaks by making the function alloc_type_arch
allocate these gdbarch-associated types on the gdbarch obstack instead
of on the general heap.  Since, from what I can tell, the types
allocated by this function are all fundamental "wired-in" types, such
types would not benefit from more granular memory management anyway.
They would likely live as long as the gdbarch is alive so allocating
them on the gdbarch obstack makes sense.

With this patch, the number of individual vargrind warnings emitted for
the command "gdb gdb" drops from ~800 to ~300.

Tested on x86_64-unknown-linux-gnu.

gdb/ChangeLog:

	* gdbtypes.c (alloc_type_arch): Allocate the type on the given
	gdbarch obstack instead of on the heap.  Update commentary
	accordingly.
This commit is contained in:
Patrick Palka 2015-06-29 10:39:26 -04:00
parent 4df0419386
commit 8f57eec2fb
2 changed files with 9 additions and 3 deletions
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6
gdb/ChangeLog
View File

@ -1,3 +1,9 @@
2015-08-29 Patrick Palka <patrick@parcs.ath.cx>
* gdbtypes.c (alloc_type_arch): Allocate the type on the given
gdbarch obstack instead of on the heap. Update commentary
accordingly.
2015-08-28 Joel Brobecker <brobecker@adacore.com>
GDB 7.10 released.

6
gdb/gdbtypes.c
View File

@ -187,7 +187,7 @@ alloc_type (struct objfile *objfile)
/* Allocate a new GDBARCH-associated type structure and fill it
with some defaults. Space for the type structure is allocated
on the heap. */
on the obstack associated with GDBARCH. */
struct type *
alloc_type_arch (struct gdbarch *gdbarch)
@ -198,8 +198,8 @@ alloc_type_arch (struct gdbarch *gdbarch)
/* Alloc the structure and start off with all fields zeroed. */
type = XCNEW (struct type);
TYPE_MAIN_TYPE (type) = XCNEW (struct main_type);
type = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct type);
TYPE_MAIN_TYPE (type) = GDBARCH_OBSTACK_ZALLOC (gdbarch, struct main_type);
TYPE_OBJFILE_OWNED (type) = 0;
TYPE_OWNER (type).gdbarch = gdbarch;