On Mon, Jul 31, 2017 at 7:41 AM, Jeff Law <[email protected]> wrote:
> This patch introduces some routines for logging of stack clash
> protection actions.
>
> I don't think this patch changed at all relative to V2.
Ok.
Richard.
>
> Jeff
>
>
> * function.c (dump_stack_clash_frame_info): New function.
> * function.h (dump_stack_clash_frame_info): Prototype.
> (enum stack_clash_probes): New enum.
>
> diff --git a/gcc/function.c b/gcc/function.c
> index f625489..ca48b3f 100644
> --- a/gcc/function.c
> +++ b/gcc/function.c
> @@ -5695,6 +5695,58 @@ get_arg_pointer_save_area (void)
> return ret;
> }
>
> +
> +/* If debugging dumps are requested, dump information about how the
> + target handled -fstack-check=clash for the prologue.
> +
> + PROBES describes what if any probes were emitted.
> +
> + RESIDUALS indicates if the prologue had any residual allocation
> + (i.e. total allocation was not a multiple of PROBE_INTERVAL). */
> +
> +void
> +dump_stack_clash_frame_info (enum stack_clash_probes probes, bool residuals)
> +{
> + if (!dump_file)
> + return;
> +
> + switch (probes)
> + {
> + case NO_PROBE_NO_FRAME:
> + fprintf (dump_file,
> + "Stack clash no probe no stack adjustment in prologue.\n");
> + break;
> + case NO_PROBE_SMALL_FRAME:
> + fprintf (dump_file,
> + "Stack clash no probe small stack adjustment in prologue.\n");
> + break;
> + case PROBE_INLINE:
> + fprintf (dump_file, "Stack clash inline probes in prologue.\n");
> + break;
> + case PROBE_LOOP:
> + fprintf (dump_file, "Stack clash probe loop in prologue.\n");
> + break;
> + }
> +
> + if (residuals)
> + fprintf (dump_file, "Stack clash residual allocation in prologue.\n");
> + else
> + fprintf (dump_file, "Stack clash no residual allocation in prologue.\n");
> +
> + if (frame_pointer_needed)
> + fprintf (dump_file, "Stack clash frame pointer needed.\n");
> + else
> + fprintf (dump_file, "Stack clash no frame pointer needed.\n");
> +
> + if (TREE_THIS_VOLATILE (cfun->decl))
> + fprintf (dump_file,
> + "Stack clash noreturn prologue, assuming no implicit"
> + " probes in caller.\n");
> + else
> + fprintf (dump_file,
> + "Stack clash not noreturn prologue.\n");
> +}
> +
> /* Add a list of INSNS to the hash HASHP, possibly allocating HASHP
> for the first time. */
>
> diff --git a/gcc/function.h b/gcc/function.h
> index 0f34bcd..87dac80 100644
> --- a/gcc/function.h
> +++ b/gcc/function.h
> @@ -553,6 +553,14 @@ do {
> \
> ((TARGET_PTRMEMFUNC_VBIT_LOCATION == ptrmemfunc_vbit_in_pfn) \
> ? MAX (FUNCTION_BOUNDARY, 2 * BITS_PER_UNIT) : FUNCTION_BOUNDARY)
>
> +enum stack_clash_probes {
> + NO_PROBE_NO_FRAME,
> + NO_PROBE_SMALL_FRAME,
> + PROBE_INLINE,
> + PROBE_LOOP
> +};
> +
> +extern void dump_stack_clash_frame_info (enum stack_clash_probes, bool);
>
>
> extern void push_function_context (void);
>
