[PATCH, Pointer Bounds Checker 3/x] Target hooks for Pointer Bounds Checker
Ilya Enkovich
enkovich.gnu@gmail.com
Tue May 6 12:11:00 GMT 2014
PING
2014-04-16 15:52 GMT+04:00 Ilya Enkovich <enkovich.gnu@gmail.com>:
> Hi,
>
> This patch introduces target hooks to be used by Pointer Bounds Checker. Hooks set is different from what was approved for 4.9 (and later reverted). I added hooks to work with returned bounds and to prepare incoming bounds for vararg functions. It allowed to remove some target assumptions from expand code.
>
> Bootstrapped and tested on linux-x86_64.
>
> OK for trunk?
>
> Thanks,
> Ilya
> --
> gcc/
>
> 2014-04-16 Ilya Enkovich <ilya.enkovich@intel.com>
>
> * target.def (builtin_chkp_function): New.
> (chkp_bound_type): New.
> (chkp_bound_mode): New.
> (chkp_make_bounds_constant): New.
> (chkp_initialize_bounds): New.
> (fn_abi_va_list_bounds_size): New.
> (load_bounds_for_arg): New.
> (store_bounds_for_arg): New.
> (load_returned_bounds): New.
> (store_returned_bounds): New.
> (chkp_function_value_bounds): New.
> (setup_incoming_vararg_bounds): New.
> * targhooks.h (default_load_bounds_for_arg): New.
> (default_store_bounds_for_arg): New.
> (default_load_returned_bounds): New.
> (default_store_returned_bounds): New.
> (default_fn_abi_va_list_bounds_size): New.
> (default_chkp_bound_type): New.
> (default_chkp_bound_mode): New.
> (default_builtin_chkp_function): New.
> (default_chkp_function_value_bounds): New.
> (default_chkp_make_bounds_constant): New.
> (default_chkp_initialize_bounds): New.
> (default_setup_incoming_vararg_bounds): New.
> * targhooks.c (default_load_bounds_for_arg): New.
> (default_store_bounds_for_arg): New.
> (default_load_returned_bounds): New.
> (default_store_returned_bounds): New.
> (default_fn_abi_va_list_bounds_size): New.
> (default_chkp_bound_type): New.
> (default_chkp_bound_mode); New.
> (default_builtin_chkp_function): New.
> (default_chkp_function_value_bounds): New.
> (default_chkp_make_bounds_constant): New.
> (default_chkp_initialize_bounds): New.
> (default_setup_incoming_vararg_bounds): New.
> * doc/tm.texi.in (TARGET_FN_ABI_VA_LIST_BOUNDS_SIZE): New.
> (TARGET_LOAD_BOUNDS_FOR_ARG): New.
> (TARGET_STORE_BOUNDS_FOR_ARG): New.
> (TARGET_LOAD_RETURNED_BOUNDS): New.
> (TARGET_STORE_RETURNED_BOUNDS): New.
> (TARGET_CHKP_FUNCTION_VALUE_BOUNDS): New.
> (TARGET_SETUP_INCOMING_VARARG_BOUNDS): New.
> (TARGET_BUILTIN_CHKP_FUNCTION): New.
> (TARGET_CHKP_BOUND_TYPE): New.
> (TARGET_CHKP_BOUND_MODE): New.
> (TARGET_CHKP_MAKE_BOUNDS_CONSTANT): New.
> (TARGET_CHKP_INITIALIZE_BOUNDS): New.
> * doc/tm.texi: Regenerated.
>
> diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
> index b8ca17e..d868129 100644
> --- a/gcc/doc/tm.texi
> +++ b/gcc/doc/tm.texi
> @@ -4333,6 +4333,13 @@ This hook returns the va_list type of the calling convention specified by
> The default version of this hook returns @code{va_list_type_node}.
> @end deftypefn
>
> +@deftypefn {Target Hook} tree TARGET_FN_ABI_VA_LIST_BOUNDS_SIZE (tree @var{fndecl})
> +This hook returns size for @code{va_list} object in function specified
> +by @var{fndecl}. This hook is used by Pointer Bounds Checker to build bounds
> +for @code{va_list} object. Return @code{integer_zero_node} if no bounds
> +should be used (e.g. @code{va_list} is a scalar pointer to the stack).
> +@end deftypefn
> +
> @deftypefn {Target Hook} tree TARGET_CANONICAL_VA_LIST_TYPE (tree @var{type})
> This hook returns the va_list type of the calling convention specified by the
> type of @var{type}. If @var{type} is not a valid va_list type, it returns
> @@ -5150,6 +5157,49 @@ defined, then define this hook to return @code{true} if
> Otherwise, you should not define this hook.
> @end deftypefn
>
> +@deftypefn {Target Hook} rtx TARGET_LOAD_BOUNDS_FOR_ARG (rtx @var{slot}, rtx @var{arg}, rtx @var{slot_no})
> +This hook is used by expand pass to emit insn to load bounds of
> +@var{arg} passed in @var{slot}. Expand pass uses this hook in case
> +bounds of @var{arg} are not passed in register. If @var{slot} is a
> +memory, then bounds are loaded as for regular pointer loaded from
> +memory. If @var{slot} is not a memory then @var{slot_no} is an integer
> +constant holding number of the target dependent special slot which
> +should be used to obtain bounds. Hook returns RTX holding loaded bounds.
> +@end deftypefn
> +
> +@deftypefn {Target Hook} void TARGET_STORE_BOUNDS_FOR_ARG (rtx @var{arg}, rtx @var{slot}, rtx @var{bounds}, rtx @var{slot_no})
> +This hook is used by expand pass to emit insns to store @var{bounds} of
> +@var{arg} passed in @var{slot}. Expand pass uses this hook in case
> +@var{bounds} of @var{arg} are not passed in register. If @var{slot} is a
> +memory, then @var{bounds} are stored as for regular pointer stored in
> +memory. If @var{slot} is not a memory then @var{slot_no} is an integer
> +constant holding number of the target dependent special slot which
> +should be used to store @var{bounds}.
> +@end deftypefn
> +
> +@deftypefn {Target Hook} rtx TARGET_LOAD_RETURNED_BOUNDS (rtx @var{slot})
> +This hook is used by expand pass to emit insn to load bounds
> +returned by function call in @var{slot}. Hook returns RTX holding
> +loaded bounds.
> +@end deftypefn
> +
> +@deftypefn {Target Hook} void TARGET_STORE_RETURNED_BOUNDS (rtx @var{slot}, rtx @var{bounds})
> +This hook is used by expand pass to emit insn to store @var{bounds}
> +returned by function call into @var{slot}.
> +@end deftypefn
> +
> +@deftypefn {Target Hook} rtx TARGET_CHKP_FUNCTION_VALUE_BOUNDS (const_tree @var{ret_type}, const_tree @var{fn_decl_or_type}, bool @var{outgoing})
> +Define this to return an RTX representing the place where a function
> +returns bounds for returned pointers. Arguments meaning is similar to
> +@code{TARGET_FUNCTION_VALUE}.
> +@end deftypefn
> +
> +@deftypefn {Target Hook} void TARGET_SETUP_INCOMING_VARARG_BOUNDS (cumulative_args_t @var{args_so_far}, enum machine_mode @var{mode}, tree @var{type}, int *@var{pretend_args_size}, int @var{second_time})
> +Use it to store bounds for anonymous register arguments stored
> +into the stack. Arguments meaning is similar to
> +@code{TARGET_SETUP_INCOMING_VARARGS}.
> +@end deftypefn
> +
> @node Trampolines
> @section Trampolines for Nested Functions
> @cindex trampolines for nested functions
> @@ -10952,6 +11002,93 @@ ignored. This function should return the result of the call to the
> built-in function.
> @end deftypefn
>
> +@deftypefn {Target Hook} tree TARGET_BUILTIN_CHKP_FUNCTION (unsigned @var{fcode})
> +This hook allows target to redefine built-in functions used by
> +Pointer Bounds Checker for code instrumentation. Hook should return
> +fndecl of function implementing generic builtin whose code is
> +passed in @var{fcode}. Currently following built-in functions are
> +obtained using this hook:
> +@deftypefn {Built-in Function} __bounds_type __chkp_bndmk (const void *@var{lb}, size_t @var{size})
> +Function code - BUILT_IN_CHKP_BNDMK. This built-in function is used
> +by Pointer Bounds Checker to create bound values. @var{lb} holds low
> +bound of the resulting bounds. @var{size} holds size of created bounds.
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} void __chkp_bndstx (const void *@var{ptr}, __bounds_type @var{b}, const void **@var{loc})
> +Function code - @code{BUILT_IN_CHKP_BNDSTX}. This built-in function is used
> +by Pointer Bounds Checker to store bounds @var{b} for pointer @var{ptr}
> +when @var{ptr} is stored by address @var{loc}.
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} __bounds_type __chkp_bndldx (const void **@var{loc}, const void *@var{ptr})
> +Function code - @code{BUILT_IN_CHKP_BNDLDX}. This built-in function is used
> +by Pointer Bounds Checker to get bounds of pointer @var{ptr} loaded by
> +address @var{loc}.
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} void __chkp_bndcl (const void *@var{ptr}, __bounds_type @var{b})
> +Function code - @code{BUILT_IN_CHKP_BNDCL}. This built-in function is used
> +by Pointer Bounds Checker to perform check for pointer @var{ptr} against
> +lower bound of bounds @var{b}.
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} void __chkp_bndcu (const void *@var{ptr}, __bounds_type @var{b})
> +Function code - @code{BUILT_IN_CHKP_BNDCU}. This built-in function is used
> +by Pointer Bounds Checker to perform check for pointer @var{ptr} against
> +upper bound of bounds @var{b}.
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} __bounds_type __chkp_bndret (void *@var{ptr})
> +Function code - @code{BUILT_IN_CHKP_BNDRET}. This built-in function is used
> +by Pointer Bounds Checker to obtain bounds returned by a call statement.
> +@var{ptr} passed to built-in is @code{SSA_NAME} returned by the call.
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} __bounds_type __chkp_intersect (__bounds_type @var{b1}, __bounds_type @var{b2})
> +Function code - @code{BUILT_IN_CHKP_INTERSECT}. This built-in function
> +returns intersection of bounds @var{b1} and @var{b2}.
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} __bounds_type __chkp_narrow (const void *@var{ptr}, __bounds_type @var{b}, size_t @var{s})
> +Function code - @code{BUILT_IN_CHKP_NARROW}. This built-in function
> +returns intersection of bounds @var{b} and
> +[@var{ptr}, @var{ptr} + @var{s} - @code{1}].
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} size_t __chkp_sizeof (const void *@var{ptr})
> +Function code - @code{BUILT_IN_CHKP_SIZEOF}. This built-in function
> +returns size of object referenced by @var{ptr}. @var{ptr} is always
> +@code{ADDR_EXPR} of @code{VAR_DECL}. This built-in is used by
> +Pointer Boudns Checker when bounds of object cannot be computed statically
> +(e.g. object has incomplete type).
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} const void *__chkp_extract_lower (__bounds_type @var{b})
> +Function code - @code{BUILT_IN_CHKP_EXTRACT_LOWER}. This built-in function
> +returns lower bound of bounds @var{b}.
> +@end deftypefn
> +
> +@deftypefn {Built-in Function} const void *__chkp_extract_upper (__bounds_type @var{b})
> +Function code - @code{BUILT_IN_CHKP_EXTRACT_UPPER}. This built-in function
> +returns upper bound of bounds @var{b}.
> +@end deftypefn
> +@end deftypefn
> +@deftypefn {Target Hook} tree TARGET_CHKP_BOUND_TYPE (void)
> +Return type to be used for bounds
> +@end deftypefn
> +@deftypefn {Target Hook} {enum machine_mode} TARGET_CHKP_BOUND_MODE (void)
> +Return mode to be used for bounds.
> +@end deftypefn
> +@deftypefn {Target Hook} tree TARGET_CHKP_MAKE_BOUNDS_CONSTANT (HOST_WIDE_INT @var{lb}, HOST_WIDE_INT @var{ub})
> +Return constant used to statically initialize constant bounds
> +with specified lower bound @var{lb} and upper bounds @var{ub}.
> +@end deftypefn
> +@deftypefn {Target Hook} int TARGET_CHKP_INITIALIZE_BOUNDS (tree @var{var}, tree @var{lb}, tree @var{ub}, tree *@var{stmts})
> +Generate a list of statements @var{stmts} to initialize pointer
> +bounds variable @var{var} with bounds @var{lb} and @var{ub}. Return
> +the number of generated statements.
> +@end deftypefn
> +
> @deftypefn {Target Hook} tree TARGET_RESOLVE_OVERLOADED_BUILTIN (unsigned int @var{loc}, tree @var{fndecl}, void *@var{arglist})
> Select a replacement for a machine specific built-in function that
> was set up by @samp{TARGET_INIT_BUILTINS}. This is done
> diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
> index d793d26..5c12180 100644
> --- a/gcc/doc/tm.texi.in
> +++ b/gcc/doc/tm.texi.in
> @@ -3691,6 +3691,8 @@ stack.
>
> @hook TARGET_FN_ABI_VA_LIST
>
> +@hook TARGET_FN_ABI_VA_LIST_BOUNDS_SIZE
> +
> @hook TARGET_CANONICAL_VA_LIST_TYPE
>
> @hook TARGET_GIMPLIFY_VA_ARG_EXPR
> @@ -4061,6 +4063,18 @@ These machine description macros help implement varargs:
>
> @hook TARGET_PRETEND_OUTGOING_VARARGS_NAMED
>
> +@hook TARGET_LOAD_BOUNDS_FOR_ARG
> +
> +@hook TARGET_STORE_BOUNDS_FOR_ARG
> +
> +@hook TARGET_LOAD_RETURNED_BOUNDS
> +
> +@hook TARGET_STORE_RETURNED_BOUNDS
> +
> +@hook TARGET_CHKP_FUNCTION_VALUE_BOUNDS
> +
> +@hook TARGET_SETUP_INCOMING_VARARG_BOUNDS
> +
> @node Trampolines
> @section Trampolines for Nested Functions
> @cindex trampolines for nested functions
> @@ -8206,6 +8220,12 @@ to by @var{ce_info}.
>
> @hook TARGET_EXPAND_BUILTIN
>
> +@hook TARGET_BUILTIN_CHKP_FUNCTION
> +@hook TARGET_CHKP_BOUND_TYPE
> +@hook TARGET_CHKP_BOUND_MODE
> +@hook TARGET_CHKP_MAKE_BOUNDS_CONSTANT
> +@hook TARGET_CHKP_INITIALIZE_BOUNDS
> +
> @hook TARGET_RESOLVE_OVERLOADED_BUILTIN
>
> @hook TARGET_FOLD_BUILTIN
> diff --git a/gcc/target.def b/gcc/target.def
> index 3a64cd1..53505b5 100644
> --- a/gcc/target.def
> +++ b/gcc/target.def
> @@ -2078,6 +2078,107 @@ built-in function.",
> (tree exp, rtx target, rtx subtarget, enum machine_mode mode, int ignore),
> default_expand_builtin)
>
> +DEFHOOK
> +(builtin_chkp_function,
> + "This hook allows target to redefine built-in functions used by\n\
> +Pointer Bounds Checker for code instrumentation. Hook should return\n\
> +fndecl of function implementing generic builtin whose code is\n\
> +passed in @var{fcode}. Currently following built-in functions are\n\
> +obtained using this hook:\n\
> +@deftypefn {Built-in Function} __bounds_type __chkp_bndmk (const void *@var{lb}, size_t @var{size})\n\
> +Function code - BUILT_IN_CHKP_BNDMK. This built-in function is used\n\
> +by Pointer Bounds Checker to create bound values. @var{lb} holds low\n\
> +bound of the resulting bounds. @var{size} holds size of created bounds.\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} void __chkp_bndstx (const void *@var{ptr}, __bounds_type @var{b}, const void **@var{loc})\n\
> +Function code - @code{BUILT_IN_CHKP_BNDSTX}. This built-in function is used\n\
> +by Pointer Bounds Checker to store bounds @var{b} for pointer @var{ptr}\n\
> +when @var{ptr} is stored by address @var{loc}.\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} __bounds_type __chkp_bndldx (const void **@var{loc}, const void *@var{ptr})\n\
> +Function code - @code{BUILT_IN_CHKP_BNDLDX}. This built-in function is used\n\
> +by Pointer Bounds Checker to get bounds of pointer @var{ptr} loaded by\n\
> +address @var{loc}.\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} void __chkp_bndcl (const void *@var{ptr}, __bounds_type @var{b})\n\
> +Function code - @code{BUILT_IN_CHKP_BNDCL}. This built-in function is used\n\
> +by Pointer Bounds Checker to perform check for pointer @var{ptr} against\n\
> +lower bound of bounds @var{b}.\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} void __chkp_bndcu (const void *@var{ptr}, __bounds_type @var{b})\n\
> +Function code - @code{BUILT_IN_CHKP_BNDCU}. This built-in function is used\n\
> +by Pointer Bounds Checker to perform check for pointer @var{ptr} against\n\
> +upper bound of bounds @var{b}.\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} __bounds_type __chkp_bndret (void *@var{ptr})\n\
> +Function code - @code{BUILT_IN_CHKP_BNDRET}. This built-in function is used\n\
> +by Pointer Bounds Checker to obtain bounds returned by a call statement.\n\
> +@var{ptr} passed to built-in is @code{SSA_NAME} returned by the call.\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} __bounds_type __chkp_intersect (__bounds_type @var{b1}, __bounds_type @var{b2})\n\
> +Function code - @code{BUILT_IN_CHKP_INTERSECT}. This built-in function\n\
> +returns intersection of bounds @var{b1} and @var{b2}.\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} __bounds_type __chkp_narrow (const void *@var{ptr}, __bounds_type @var{b}, size_t @var{s})\n\
> +Function code - @code{BUILT_IN_CHKP_NARROW}. This built-in function\n\
> +returns intersection of bounds @var{b} and\n\
> +[@var{ptr}, @var{ptr} + @var{s} - @code{1}].\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} size_t __chkp_sizeof (const void *@var{ptr})\n\
> +Function code - @code{BUILT_IN_CHKP_SIZEOF}. This built-in function\n\
> +returns size of object referenced by @var{ptr}. @var{ptr} is always\n\
> +@code{ADDR_EXPR} of @code{VAR_DECL}. This built-in is used by\n\
> +Pointer Boudns Checker when bounds of object cannot be computed statically\n\
> +(e.g. object has incomplete type).\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} const void *__chkp_extract_lower (__bounds_type @var{b})\n\
> +Function code - @code{BUILT_IN_CHKP_EXTRACT_LOWER}. This built-in function\n\
> +returns lower bound of bounds @var{b}.\n\
> +@end deftypefn\n\
> +\n\
> +@deftypefn {Built-in Function} const void *__chkp_extract_upper (__bounds_type @var{b})\n\
> +Function code - @code{BUILT_IN_CHKP_EXTRACT_UPPER}. This built-in function\n\
> +returns upper bound of bounds @var{b}.\n\
> +@end deftypefn",
> + tree, (unsigned fcode),
> + default_builtin_chkp_function)
> +
> +DEFHOOK
> +(chkp_bound_type,
> + "Return type to be used for bounds",
> + tree, (void),
> + default_chkp_bound_type)
> +
> +DEFHOOK
> +(chkp_bound_mode,
> + "Return mode to be used for bounds.",
> + enum machine_mode, (void),
> + default_chkp_bound_mode)
> +
> +DEFHOOK
> +(chkp_make_bounds_constant,
> + "Return constant used to statically initialize constant bounds\n\
> +with specified lower bound @var{lb} and upper bounds @var{ub}.",
> + tree, (HOST_WIDE_INT lb, HOST_WIDE_INT ub),
> + default_chkp_make_bounds_constant)
> +
> +DEFHOOK
> +(chkp_initialize_bounds,
> + "Generate a list of statements @var{stmts} to initialize pointer\n\
> +bounds variable @var{var} with bounds @var{lb} and @var{ub}. Return\n\
> +the number of generated statements.",
> + int, (tree var, tree lb, tree ub, tree *stmts),
> + default_chkp_initialize_bounds)
> +
> /* Select a replacement for a target-specific builtin. This is done
> *before* regular type checking, and so allows the target to
> implement a crude form of function overloading. The result is a
> @@ -3328,6 +3429,15 @@ The default version of this hook returns @code{va_list_type_node}.",
> tree, (tree fndecl),
> std_fn_abi_va_list)
>
> +DEFHOOK
> +(fn_abi_va_list_bounds_size,
> + "This hook returns size for @code{va_list} object in function specified\n\
> +by @var{fndecl}. This hook is used by Pointer Bounds Checker to build bounds\n\
> +for @code{va_list} object. Return @code{integer_zero_node} if no bounds\n\
> +should be used (e.g. @code{va_list} is a scalar pointer to the stack).",
> + tree, (tree fndecl),
> + default_fn_abi_va_list_bounds_size)
> +
> /* Get the __builtin_va_list type dependent on input type. */
> DEFHOOK
> (canonical_va_list_type,
> @@ -3776,6 +3886,54 @@ not generate any instructions in this case.",
> default_setup_incoming_varargs)
>
> DEFHOOK
> +(load_bounds_for_arg,
> + "This hook is used by expand pass to emit insn to load bounds of\n\
> +@var{arg} passed in @var{slot}. Expand pass uses this hook in case\n\
> +bounds of @var{arg} are not passed in register. If @var{slot} is a\n\
> +memory, then bounds are loaded as for regular pointer loaded from\n\
> +memory. If @var{slot} is not a memory then @var{slot_no} is an integer\n\
> +constant holding number of the target dependent special slot which\n\
> +should be used to obtain bounds. Hook returns RTX holding loaded bounds.",
> + rtx, (rtx slot, rtx arg, rtx slot_no),
> + default_load_bounds_for_arg)
> +
> +DEFHOOK
> +(store_bounds_for_arg,
> + "This hook is used by expand pass to emit insns to store @var{bounds} of\n\
> +@var{arg} passed in @var{slot}. Expand pass uses this hook in case\n\
> +@var{bounds} of @var{arg} are not passed in register. If @var{slot} is a\n\
> +memory, then @var{bounds} are stored as for regular pointer stored in\n\
> +memory. If @var{slot} is not a memory then @var{slot_no} is an integer\n\
> +constant holding number of the target dependent special slot which\n\
> +should be used to store @var{bounds}.",
> + void, (rtx arg, rtx slot, rtx bounds, rtx slot_no),
> + default_store_bounds_for_arg)
> +
> +DEFHOOK
> +(load_returned_bounds,
> + "This hook is used by expand pass to emit insn to load bounds\n\
> +returned by function call in @var{slot}. Hook returns RTX holding\n\
> +loaded bounds.",
> + rtx, (rtx slot),
> + default_load_returned_bounds)
> +
> +DEFHOOK
> +(store_returned_bounds,
> + "This hook is used by expand pass to emit insn to store @var{bounds}\n\
> +returned by function call into @var{slot}.",
> + void, (rtx slot, rtx bounds),
> + default_store_returned_bounds)
> +
> +DEFHOOK
> +(setup_incoming_vararg_bounds,
> + "Use it to store bounds for anonymous register arguments stored\n\
> +into the stack. Arguments meaning is similar to\n\
> +@code{TARGET_SETUP_INCOMING_VARARGS}.",
> + void, (cumulative_args_t args_so_far, enum machine_mode mode, tree type,
> + int *pretend_args_size, int second_time),
> + default_setup_incoming_vararg_bounds)
> +
> +DEFHOOK
> (strict_argument_naming,
> "Define this hook to return @code{true} if the location where a function\n\
> argument is passed depends on whether or not it is a named argument.\n\
> @@ -4052,6 +4210,15 @@ aggregate data types, because these are returned in another way. See\n\
> rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
> default_function_value)
>
> +/* Return the rtx for bounds of returned pointer. */
> +DEFHOOK
> +(chkp_function_value_bounds,
> + "Define this to return an RTX representing the place where a function\n\
> +returns bounds for returned pointers. Arguments meaning is similar to\n\
> +@code{TARGET_FUNCTION_VALUE}.",
> + rtx, (const_tree ret_type, const_tree fn_decl_or_type, bool outgoing),
> + default_chkp_function_value_bounds)
> +
> /* Return the rtx for the result of a libcall of mode MODE,
> calling the function FN_NAME. */
> DEFHOOK
> diff --git a/gcc/targhooks.c b/gcc/targhooks.c
> index 79491c7..28e200e 100644
> --- a/gcc/targhooks.c
> +++ b/gcc/targhooks.c
> @@ -1574,6 +1574,42 @@ default_member_type_forces_blk (const_tree, enum machine_mode)
> return false;
> }
>
> +rtx
> +default_load_bounds_for_arg (rtx addr ATTRIBUTE_UNUSED,
> + rtx ptr ATTRIBUTE_UNUSED,
> + rtx bnd ATTRIBUTE_UNUSED)
> +{
> + gcc_unreachable ();
> +}
> +
> +void
> +default_store_bounds_for_arg (rtx val ATTRIBUTE_UNUSED,
> + rtx addr ATTRIBUTE_UNUSED,
> + rtx bounds ATTRIBUTE_UNUSED,
> + rtx to ATTRIBUTE_UNUSED)
> +{
> + gcc_unreachable ();
> +}
> +
> +rtx
> +default_load_returned_bounds (rtx slot ATTRIBUTE_UNUSED)
> +{
> + gcc_unreachable ();
> +}
> +
> +void
> +default_store_returned_bounds (rtx slot ATTRIBUTE_UNUSED,
> + rtx bounds ATTRIBUTE_UNUSED)
> +{
> + gcc_unreachable ();
> +}
> +
> +tree
> +default_fn_abi_va_list_bounds_size (tree fndecl ATTRIBUTE_UNUSED)
> +{
> + return integer_zero_node;
> +}
> +
> /* Default version of canonicalize_comparison. */
>
> void
> @@ -1698,6 +1734,62 @@ std_gimplify_va_arg_expr (tree valist, tree type, gimple_seq *pre_p,
> return build_va_arg_indirect_ref (addr);
> }
>
> +tree
> +default_chkp_bound_type (void)
> +{
> + tree res = make_node (POINTER_BOUNDS_TYPE);
> + TYPE_PRECISION (res) = TYPE_PRECISION (size_type_node) * 2;
> + TYPE_NAME (res) = get_identifier ("__bounds_type");
> + SET_TYPE_MODE (res, targetm.chkp_bound_mode ());
> + layout_type (res);
> + return res;
> +}
> +
> +enum machine_mode
> +default_chkp_bound_mode (void)
> +{
> + return VOIDmode;
> +}
> +
> +tree
> +default_builtin_chkp_function (unsigned int fcode ATTRIBUTE_UNUSED)
> +{
> + return NULL_TREE;
> +}
> +
> +rtx
> +default_chkp_function_value_bounds (const_tree ret_type ATTRIBUTE_UNUSED,
> + const_tree fn_decl_or_type ATTRIBUTE_UNUSED,
> + bool outgoing ATTRIBUTE_UNUSED)
> +{
> + gcc_unreachable ();
> +}
> +
> +tree
> +default_chkp_make_bounds_constant (HOST_WIDE_INT lb ATTRIBUTE_UNUSED,
> + HOST_WIDE_INT ub ATTRIBUTE_UNUSED)
> +{
> + return NULL_TREE;
> +}
> +
> +int
> +default_chkp_initialize_bounds (tree var ATTRIBUTE_UNUSED,
> + tree lb ATTRIBUTE_UNUSED,
> + tree ub ATTRIBUTE_UNUSED,
> + tree *stmts ATTRIBUTE_UNUSED)
> +{
> + return 0;
> +}
> +
> +void
> +default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
> + enum machine_mode mode ATTRIBUTE_UNUSED,
> + tree type ATTRIBUTE_UNUSED,
> + int *pretend_arg_size ATTRIBUTE_UNUSED,
> + int second_time ATTRIBUTE_UNUSED)
> +{
> +}
> +
> /* An implementation of TARGET_CAN_USE_DOLOOP_P for targets that do
> not support nested low-overhead loops. */
>
> diff --git a/gcc/targhooks.h b/gcc/targhooks.h
> index 9dd4c83..4eaf88b 100644
> --- a/gcc/targhooks.h
> +++ b/gcc/targhooks.h
> @@ -206,5 +206,23 @@ extern bool default_member_type_forces_blk (const_tree, enum machine_mode);
> extern void default_atomic_assign_expand_fenv (tree *, tree *, tree *);
> extern tree build_va_arg_indirect_ref (tree);
> extern tree std_gimplify_va_arg_expr (tree, tree, gimple_seq *, gimple_seq *);
> +
> +extern rtx default_load_bounds_for_arg (rtx, rtx, rtx);
> +extern void default_store_bounds_for_arg (rtx, rtx, rtx, rtx);
> +extern rtx default_load_returned_bounds (rtx);
> +extern void default_store_returned_bounds (rtx,rtx);
> +extern tree default_fn_abi_va_list_bounds_size (tree);
> +extern tree default_chkp_bound_type (void);
> +extern enum machine_mode default_chkp_bound_mode (void);
> +extern tree default_builtin_chkp_function (unsigned int);
> +extern rtx default_chkp_function_value_bounds (const_tree, const_tree, bool);
> +extern tree default_chkp_make_bounds_constant (HOST_WIDE_INT lb, HOST_WIDE_INT ub);
> +extern int default_chkp_initialize_bounds (tree var, tree lb, tree ub,
> + tree *stmts);
> +extern void default_setup_incoming_vararg_bounds (cumulative_args_t ca ATTRIBUTE_UNUSED,
> + enum machine_mode mode ATTRIBUTE_UNUSED,
> + tree type ATTRIBUTE_UNUSED,
> + int *pretend_arg_size ATTRIBUTE_UNUSED,
> + int second_time ATTRIBUTE_UNUSED);
> extern bool can_use_doloop_if_innermost (double_int, double_int,
> unsigned int, bool);
More information about the Gcc-patches
mailing list