[PATCH] gcc: pass-manager: Fix memory leak. [PR jit/63854]

[Jeff Law]

On 1/31/2022 4:42 AM, Marc Nieper-Wißkirchen wrote:
> Before the patch, compiling the hello world example of libgccjit with
> the external driver under Valgrind shows a loss of 12,611 (48 direct)
> bytes.  After the patch, no memory leaks are reported anymore.
> (Memory leaks occurring when using the internal driver are mostly in
> the driver code in gcc/gcc.c and have to be fixed separately.)
>
> The patch has been tested by fully bootstrapping the compiler with the
> frontends C, C++, Fortran, LTO, ObjC, JIT and running the test suite
> under a x86_64-pc-linux-gnu host.
>
> gcc/ChangeLog:
>
> 	PR jit/63854
> 	* hash-traits.h (struct typed_const_free_remove): New.
> 	(struct free_string_hash): New.
> 	* pass_manager.h: Use free_string_hash.
> 	* passes.cc (pass_manager::register_pass_name): Use free_string_hash.
>          (pass_manager::~pass_manager): Delete allocated m_name_to_pass_map
I'd hoped David would handle this and I've been insanely busy. 
Regardless, I've pushed this to the trunk.  Thanks and sorry for the 
long delays.

jeff