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+/* Data structure definitions for a generic GCC target.
+ Copyright (C) 2001-2023 Free Software Foundation, Inc.
+
+ This program is free software; you can redistribute it and/or modify it
+ under the terms of the GNU General Public License as published by the
+ Free Software Foundation; either version 3, or (at your option) any
+ later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; see the file COPYING3. If not see
+ <http://www.gnu.org/licenses/>.
+
+ In other words, you are welcome to use, share and improve this program.
+ You are forbidden to forbid anyone else to use, share and improve
+ what you give them. Help stamp out software-hoarding! */
+
+
+/* This file contains a data structure that describes a GCC target.
+ At present it is incomplete, but in future it should grow to
+ contain most or all target machine and target O/S specific
+ information.
+
+ This structure has its initializer declared in target-def.h in the
+ form of large macro TARGET_INITIALIZER that expands to many smaller
+ macros.
+
+ The smaller macros each initialize one component of the structure,
+ and each has a default. Each target should have a file that
+ includes target.h and target-def.h, and overrides any inappropriate
+ defaults by undefining the relevant macro and defining a suitable
+ replacement. That file should then contain the definition of
+ "targetm" like so:
+
+ struct gcc_target targetm = TARGET_INITIALIZER;
+
+ Doing things this way allows us to bring together everything that
+ defines a GCC target. By supplying a default that is appropriate
+ to most targets, we can easily add new items without needing to
+ edit dozens of target configuration files. It should also allow us
+ to gradually reduce the amount of conditional compilation that is
+ scattered throughout GCC. */
+
+#ifndef GCC_TARGET_H
+#define GCC_TARGET_H
+
+#include "insn-codes.h"
+#include "tm.h"
+#include "hard-reg-set.h"
+
+#if CHECKING_P
+
+struct cumulative_args_t { void *magic; void *p; };
+
+#else /* !CHECKING_P */
+
+/* When using a GCC build compiler, we could use
+ __attribute__((transparent_union)) to get cumulative_args_t function
+ arguments passed like scalars where the ABI would mandate a less
+ efficient way of argument passing otherwise. However, that would come
+ at the cost of less type-safe !CHECKING_P compilation. */
+
+union cumulative_args_t { void *p; };
+
+#endif /* !CHECKING_P */
+
+/* Types of memory operation understood by the "by_pieces" infrastructure.
+ Used by the TARGET_USE_BY_PIECES_INFRASTRUCTURE_P target hook and
+ internally by the functions in expr.cc. */
+
+enum by_pieces_operation
+{
+ CLEAR_BY_PIECES,
+ MOVE_BY_PIECES,
+ SET_BY_PIECES,
+ STORE_BY_PIECES,
+ COMPARE_BY_PIECES
+};
+
+extern unsigned HOST_WIDE_INT by_pieces_ninsns (unsigned HOST_WIDE_INT,
+ unsigned int,
+ unsigned int,
+ by_pieces_operation);
+
+/* An example implementation for ELF targets. Defined in varasm.cc */
+extern void elf_record_gcc_switches (const char *);
+
+/* Some places still assume that all pointer or address modes are the
+ standard Pmode and ptr_mode. These optimizations become invalid if
+ the target actually supports multiple different modes. For now,
+ we disable such optimizations on such targets, using this function. */
+extern bool target_default_pointer_address_modes_p (void);
+
+/* For hooks which use the MOVE_RATIO macro, this gives the legacy default
+ behavior. */
+extern unsigned int get_move_ratio (bool);
+
+struct stdarg_info;
+struct spec_info_def;
+struct hard_reg_set_container;
+struct cgraph_node;
+struct cgraph_simd_clone;
+
+/* The struct used by the secondary_reload target hook. */
+struct secondary_reload_info
+{
+ /* icode is actually an enum insn_code, but we don't want to force every
+ file that includes target.h to include optabs.h . */
+ int icode;
+ int extra_cost; /* Cost for using (a) scratch register(s) to be taken
+ into account by copy_cost. */
+ /* The next two members are for the use of the backward
+ compatibility hook. */
+ struct secondary_reload_info *prev_sri;
+ int t_icode; /* Actually an enum insn_code - see above. */
+};
+
+/* This is defined in sched-int.h . */
+struct _dep;
+
+/* This is defined in ddg.h . */
+struct ddg;
+
+/* This is defined in cfgloop.h . */
+class loop;
+
+/* This is defined in ifcvt.h. */
+struct noce_if_info;
+
+/* This is defined in tree-ssa-alias.h. */
+class ao_ref;
+
+/* This is defined in tree-vectorizer.h. */
+class _stmt_vec_info;
+
+/* This is defined in calls.h. */
+class function_arg_info;
+
+/* This is defined in function-abi.h. */
+class predefined_function_abi;
+
+/* These are defined in tree-vect-stmts.cc. */
+extern tree stmt_vectype (class _stmt_vec_info *);
+extern bool stmt_in_inner_loop_p (class vec_info *, class _stmt_vec_info *);
+
+/* Assembler instructions for creating various kinds of integer object. */
+
+struct asm_int_op
+{
+ const char *hi;
+ const char *psi;
+ const char *si;
+ const char *pdi;
+ const char *di;
+ const char *pti;
+ const char *ti;
+};
+
+/* Types of costs for vectorizer cost model. */
+enum vect_cost_for_stmt
+{
+ scalar_stmt,
+ scalar_load,
+ scalar_store,
+ vector_stmt,
+ vector_load,
+ vector_gather_load,
+ unaligned_load,
+ unaligned_store,
+ vector_store,
+ vector_scatter_store,
+ vec_to_scalar,
+ scalar_to_vec,
+ cond_branch_not_taken,
+ cond_branch_taken,
+ vec_perm,
+ vec_promote_demote,
+ vec_construct
+};
+
+/* Separate locations for which the vectorizer cost model should
+ track costs. */
+enum vect_cost_model_location {
+ vect_prologue = 0,
+ vect_body = 1,
+ vect_epilogue = 2
+};
+
+class vec_perm_indices;
+
+/* The type to use for lists of vector sizes. */
+typedef vec<machine_mode> vector_modes;
+
+/* Same, but can be used to construct local lists that are
+ automatically freed. */
+typedef auto_vec<machine_mode, 8> auto_vector_modes;
+
+/* First argument of targetm.omp.device_kind_arch_isa. */
+enum omp_device_kind_arch_isa {
+ omp_device_kind,
+ omp_device_arch,
+ omp_device_isa
+};
+
+/* Flags returned by TARGET_VECTORIZE_AUTOVECTORIZE_VECTOR_MODES:
+
+ VECT_COMPARE_COSTS
+ Tells the loop vectorizer to try all the provided modes and
+ pick the one with the lowest cost. By default the vectorizer
+ will choose the first mode that works. */
+const unsigned int VECT_COMPARE_COSTS = 1U << 0;
+
+/* The contexts in which the use of a type T can be checked by
+ TARGET_VERIFY_TYPE_CONTEXT. */
+enum type_context_kind {
+ /* Directly measuring the size of T. */
+ TCTX_SIZEOF,
+
+ /* Directly measuring the alignment of T. */
+ TCTX_ALIGNOF,
+
+ /* Creating objects of type T with static storage duration. */
+ TCTX_STATIC_STORAGE,
+
+ /* Creating objects of type T with thread-local storage duration. */
+ TCTX_THREAD_STORAGE,
+
+ /* Creating a field of type T. */
+ TCTX_FIELD,
+
+ /* Creating an array with elements of type T. */
+ TCTX_ARRAY_ELEMENT,
+
+ /* Adding to or subtracting from a pointer to T, or computing the
+ difference between two pointers when one of them is a pointer to T. */
+ TCTX_POINTER_ARITH,
+
+ /* Dynamically allocating objects of type T. */
+ TCTX_ALLOCATION,
+
+ /* Dynamically deallocating objects of type T. */
+ TCTX_DEALLOCATION,
+
+ /* Throwing or catching an object of type T. */
+ TCTX_EXCEPTIONS,
+
+ /* Capturing objects of type T by value in a closure. */
+ TCTX_CAPTURE_BY_COPY
+};
+
+enum poly_value_estimate_kind
+{
+ POLY_VALUE_MIN,
+ POLY_VALUE_MAX,
+ POLY_VALUE_LIKELY
+};
+
+typedef void (*emit_support_tinfos_callback) (tree);
+
+extern bool verify_type_context (location_t, type_context_kind, const_tree,
+ bool = false);
+
+/* The target structure. This holds all the backend hooks. */
+#define DEFHOOKPOD(NAME, DOC, TYPE, INIT) TYPE NAME;
+#define DEFHOOK(NAME, DOC, TYPE, PARAMS, INIT) TYPE (* NAME) PARAMS;
+#define DEFHOOK_UNDOC DEFHOOK
+#define HOOKSTRUCT(FRAGMENT) FRAGMENT
+
+#include "target.def"
+
+extern struct gcc_target targetm;
+
+/* Return an estimate of the runtime value of X, for use in things
+ like cost calculations or profiling frequencies. Note that this
+ function should never be used in situations where the actual
+ runtime value is needed for correctness, since the function only
+ provides a rough guess. */
+
+inline HOST_WIDE_INT
+estimated_poly_value (poly_int64 x,
+ poly_value_estimate_kind kind = POLY_VALUE_LIKELY)
+{
+ if (NUM_POLY_INT_COEFFS == 1)
+ return x.coeffs[0];
+ else
+ return targetm.estimated_poly_value (x, kind);
+}
+
+#ifdef GCC_TM_H
+
+#ifndef CUMULATIVE_ARGS_MAGIC
+#define CUMULATIVE_ARGS_MAGIC ((void *) &targetm.calls)
+#endif
+
+inline CUMULATIVE_ARGS *
+get_cumulative_args (cumulative_args_t arg)
+{
+#if CHECKING_P
+ gcc_assert (arg.magic == CUMULATIVE_ARGS_MAGIC);
+#endif /* CHECKING_P */
+ return (CUMULATIVE_ARGS *) arg.p;
+}
+
+inline cumulative_args_t
+pack_cumulative_args (CUMULATIVE_ARGS *arg)
+{
+ cumulative_args_t ret;
+
+#if CHECKING_P
+ ret.magic = CUMULATIVE_ARGS_MAGIC;
+#endif /* CHECKING_P */
+ ret.p = (void *) arg;
+ return ret;
+}
+#endif /* GCC_TM_H */
+
+#endif /* GCC_TARGET_H */