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Alex Coplan b46584d783 driver: Fix several memory leaks [PR63854]
This patch fixes several memory leaks in the driver, all of which relate
to the handling of static specs. We introduce functions
set_static_spec_{shared,owned}() which are used to enforce proper memory
management when updating the strings in the static_specs table.

This is achieved by making use of the alloc_p field in the table
entries. Similarly to set_spec(), each time we update an entry, we check
whether alloc_p is set, and free the old value if so. We then set
alloc_p correctly based on whether we "own" this memory or whether we're
just taking a pointer to a shared string which we shouldn't free.

The following table shows the number of leaks found by AddressSanitizer
when running a minimal libgccjit program on AArch64. The test program
does the whole libgccjit compilation cycle in a loop (including acquiring
and releasing the context), and the table below shows the number of leaks
for different iterations of that loop.

+--------------+-----+-----+------+---------------+
| # of runs >  | 1   | 2   | 3    | Leaks per run |
+--------------+-----+-----+------+---------------+
| Before patch | 463 | 940 | 1417 | 477           |
+--------------+-----+-----+------+---------------+
| After patch  | 416 | 846 | 1276 | 430           |
+--------------+-----+-----+------+---------------+

gcc/ChangeLog:

	PR jit/63854
	* gcc.c (set_static_spec): New.
	(set_static_spec_owned): New.
	(set_static_spec_shared): New.
	(driver::maybe_putenv_COLLECT_LTO_WRAPPER): Use
	set_static_spec_owned() to take ownership of lto_wrapper_file
	such that it gets freed in driver::finalize.
	(driver::maybe_run_linker): Use set_static_spec_shared() to
	ensure that we don't try and free() the static string "ld",
	also ensuring that any previously-allocated string in
	linker_name_spec is freed. Likewise with argv0.
	(driver::finalize): Use set_static_spec_shared() when resetting
	specs that previously had allocated strings; remove if(0)
	around call to free().
2020-08-21 14:26:11 +01:00
config Daily bump. 2020-08-21 00:16:23 +00:00
contrib
fixincludes
gcc driver: Fix several memory leaks [PR63854] 2020-08-21 14:26:11 +01:00
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libgo libgo: correctly handle AIX FAT library creation 2020-08-12 11:33:54 -07:00
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libstdc++-v3 libstdc++: Skip PSTL tests when installed TBB is too old [PR 96718] 2020-08-21 12:01:05 +01:00
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ChangeLog Daily bump. 2020-08-21 00:16:23 +00:00
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configure configure: Also check C++11 (flags) for ${build} compiler not only for ${host} 2020-08-20 21:59:00 +02:00
configure.ac configure: Also check C++11 (flags) for ${build} compiler not only for ${host} 2020-08-20 21:59:00 +02:00
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MAINTAINERS MAINTAINERS: Add myself for write after approval 2020-08-16 09:28:10 +01:00
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