/* Default target hook functions.
- Copyright (C) 2003, 2004 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
This file is part of GCC.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301, USA. */
/* The migration of target macros to target hooks works as follows:
#include "target.h"
#include "tm_p.h"
#include "target-def.h"
+#include "ggc.h"
+
void
default_external_libcall (rtx fun ATTRIBUTE_UNUSED)
!= default_setup_incoming_varargs);
}
+enum machine_mode
+default_eh_return_filter_mode (void)
+{
+ return word_mode;
+}
+
+/* The default implementation of TARGET_SHIFT_TRUNCATION_MASK. */
+
+unsigned HOST_WIDE_INT
+default_shift_truncation_mask (enum machine_mode mode)
+{
+ return SHIFT_COUNT_TRUNCATED ? GET_MODE_BITSIZE (mode) - 1 : 0;
+}
+
/* Generic hook that takes a CUMULATIVE_ARGS pointer and returns true. */
bool
{
return long_long_integer_type_node;
}
+
+
+/* Returns the size of the cookie to use when allocating an array
+ whose elements have the indicated TYPE. Assumes that it is already
+ known that a cookie is needed. */
+
+tree
+default_cxx_get_cookie_size (tree type)
+{
+ tree cookie_size;
+
+ /* We need to allocate an additional max (sizeof (size_t), alignof
+ (true_type)) bytes. */
+ tree sizetype_size;
+ tree type_align;
+
+ sizetype_size = size_in_bytes (sizetype);
+ type_align = size_int (TYPE_ALIGN_UNIT (type));
+ if (INT_CST_LT_UNSIGNED (type_align, sizetype_size))
+ cookie_size = sizetype_size;
+ else
+ cookie_size = type_align;
+
+ return cookie_size;
+}
+
+/* Return true if a parameter must be passed by reference. This version
+ of the TARGET_PASS_BY_REFERENCE hook uses just MUST_PASS_IN_STACK. */
+
+bool
+hook_pass_by_reference_must_pass_in_stack (CUMULATIVE_ARGS *c ATTRIBUTE_UNUSED,
+ enum machine_mode mode ATTRIBUTE_UNUSED, tree type ATTRIBUTE_UNUSED,
+ bool named_arg ATTRIBUTE_UNUSED)
+{
+ return targetm.calls.must_pass_in_stack (mode, type);
+}
+
+/* Return true if a parameter follows callee copies conventions. This
+ version of the hook is true for all named arguments. */
+
+bool
+hook_callee_copies_named (CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
+ enum machine_mode mode ATTRIBUTE_UNUSED,
+ tree type ATTRIBUTE_UNUSED, bool named)
+{
+ return named;
+}
+
+/* Emit any directives required to unwind this instruction. */
+
+void
+default_unwind_emit (FILE * stream ATTRIBUTE_UNUSED,
+ rtx insn ATTRIBUTE_UNUSED)
+{
+ /* Should never happen. */
+ gcc_unreachable ();
+}
+
+/* True if MODE is valid for the target. By "valid", we mean able to
+ be manipulated in non-trivial ways. In particular, this means all
+ the arithmetic is supported.
+
+ By default we guess this means that any C type is supported. If
+ we can't map the mode back to a type that would be available in C,
+ then reject it. Special case, here, is the double-word arithmetic
+ supported by optabs.c. */
+
+bool
+default_scalar_mode_supported_p (enum machine_mode mode)
+{
+ int precision = GET_MODE_PRECISION (mode);
+
+ switch (GET_MODE_CLASS (mode))
+ {
+ case MODE_PARTIAL_INT:
+ case MODE_INT:
+ if (precision == CHAR_TYPE_SIZE)
+ return true;
+ if (precision == SHORT_TYPE_SIZE)
+ return true;
+ if (precision == INT_TYPE_SIZE)
+ return true;
+ if (precision == LONG_TYPE_SIZE)
+ return true;
+ if (precision == LONG_LONG_TYPE_SIZE)
+ return true;
+ if (precision == 2 * BITS_PER_WORD)
+ return true;
+ return false;
+
+ case MODE_FLOAT:
+ if (precision == FLOAT_TYPE_SIZE)
+ return true;
+ if (precision == DOUBLE_TYPE_SIZE)
+ return true;
+ if (precision == LONG_DOUBLE_TYPE_SIZE)
+ return true;
+ return false;
+
+ default:
+ gcc_unreachable ();
+ }
+}
+
+/* NULL if INSN insn is valid within a low-overhead loop, otherwise returns
+ an error message.
+
+ This function checks whether a given INSN is valid within a low-overhead
+ loop. If INSN is invalid it returns the reason for that, otherwise it
+ returns NULL. A called function may clobber any special registers required
+ for low-overhead looping. Additionally, some targets (eg, PPC) use the count
+ register for branch on table instructions. We reject the doloop pattern in
+ these cases. */
+
+const char *
+default_invalid_within_doloop (rtx insn)
+{
+ if (CALL_P (insn))
+ return "Function call in loop.";
+
+ if (JUMP_P (insn)
+ && (GET_CODE (PATTERN (insn)) == ADDR_DIFF_VEC
+ || GET_CODE (PATTERN (insn)) == ADDR_VEC))
+ return "Computed branch in the loop.";
+
+ return NULL;
+}
+
+bool
+hook_bool_CUMULATIVE_ARGS_mode_tree_bool_false (
+ CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
+ enum machine_mode mode ATTRIBUTE_UNUSED,
+ tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
+{
+ return false;
+}
+
+bool
+hook_bool_CUMULATIVE_ARGS_mode_tree_bool_true (
+ CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
+ enum machine_mode mode ATTRIBUTE_UNUSED,
+ tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
+{
+ return true;
+}
+
+int
+hook_int_CUMULATIVE_ARGS_mode_tree_bool_0 (
+ CUMULATIVE_ARGS *ca ATTRIBUTE_UNUSED,
+ enum machine_mode mode ATTRIBUTE_UNUSED,
+ tree type ATTRIBUTE_UNUSED, bool named ATTRIBUTE_UNUSED)
+{
+ return 0;
+}
+
+const char *
+hook_invalid_arg_for_unprototyped_fn (
+ tree typelist ATTRIBUTE_UNUSED,
+ tree funcdecl ATTRIBUTE_UNUSED,
+ tree val ATTRIBUTE_UNUSED)
+{
+ return NULL;
+}
+
+/* Initialize the stack protection decls. */
+
+/* Stack protection related decls living in libgcc. */
+static GTY(()) tree stack_chk_guard_decl;
+
+tree
+default_stack_protect_guard (void)
+{
+ tree t = stack_chk_guard_decl;
+
+ if (t == NULL)
+ {
+ t = build_decl (VAR_DECL, get_identifier ("__stack_chk_guard"),
+ ptr_type_node);
+ TREE_STATIC (t) = 1;
+ TREE_PUBLIC (t) = 1;
+ DECL_EXTERNAL (t) = 1;
+ TREE_USED (t) = 1;
+ TREE_THIS_VOLATILE (t) = 1;
+ DECL_ARTIFICIAL (t) = 1;
+ DECL_IGNORED_P (t) = 1;
+
+ stack_chk_guard_decl = t;
+ }
+
+ return t;
+}
+
+static GTY(()) tree stack_chk_fail_decl;
+
+tree
+default_external_stack_protect_fail (void)
+{
+ tree t = stack_chk_fail_decl;
+
+ if (t == NULL_TREE)
+ {
+ t = build_function_type_list (void_type_node, NULL_TREE);
+ t = build_decl (FUNCTION_DECL, get_identifier ("__stack_chk_fail"), t);
+ TREE_STATIC (t) = 1;
+ TREE_PUBLIC (t) = 1;
+ DECL_EXTERNAL (t) = 1;
+ TREE_USED (t) = 1;
+ TREE_THIS_VOLATILE (t) = 1;
+ TREE_NOTHROW (t) = 1;
+ DECL_ARTIFICIAL (t) = 1;
+ DECL_IGNORED_P (t) = 1;
+
+ stack_chk_fail_decl = t;
+ }
+
+ return build_function_call_expr (t, NULL_TREE);
+}
+
+tree
+default_hidden_stack_protect_fail (void)
+{
+#ifndef HAVE_GAS_HIDDEN
+ return default_external_stack_protect_fail ();
+#else
+ tree t = stack_chk_fail_decl;
+
+ if (!flag_pic)
+ return default_external_stack_protect_fail ();
+
+ if (t == NULL_TREE)
+ {
+ t = build_function_type_list (void_type_node, NULL_TREE);
+ t = build_decl (FUNCTION_DECL,
+ get_identifier ("__stack_chk_fail_local"), t);
+ TREE_STATIC (t) = 1;
+ TREE_PUBLIC (t) = 1;
+ DECL_EXTERNAL (t) = 1;
+ TREE_USED (t) = 1;
+ TREE_THIS_VOLATILE (t) = 1;
+ TREE_NOTHROW (t) = 1;
+ DECL_ARTIFICIAL (t) = 1;
+ DECL_IGNORED_P (t) = 1;
+ DECL_VISIBILITY_SPECIFIED (t) = 1;
+ DECL_VISIBILITY (t) = VISIBILITY_HIDDEN;
+
+ stack_chk_fail_decl = t;
+ }
+
+ return build_function_call_expr (t, NULL_TREE);
+#endif
+}
+
+bool
+hook_bool_rtx_commutative_p (rtx x, int outer_code ATTRIBUTE_UNUSED)
+{
+ return COMMUTATIVE_P (x);
+}
+
+rtx
+default_function_value (tree ret_type ATTRIBUTE_UNUSED,
+ tree fn_decl_or_type,
+ bool outgoing ATTRIBUTE_UNUSED)
+{
+ /* The old interface doesn't handle receiving the function type. */
+ if (fn_decl_or_type
+ && !DECL_P (fn_decl_or_type))
+ fn_decl_or_type = NULL;
+
+#ifdef FUNCTION_OUTGOING_VALUE
+ if (outgoing)
+ return FUNCTION_OUTGOING_VALUE (ret_type, fn_decl_or_type);
+#endif
+
+#ifdef FUNCTION_VALUE
+ return FUNCTION_VALUE (ret_type, fn_decl_or_type);
+#else
+ return NULL_RTX;
+#endif
+}
+
+#include "gt-targhooks.h"
OSDN Git Service
