| /* Data structure definitions for a generic GCC target. |
| Copyright (C) 2001-2021 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.c. */ |
| |
| 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.c */ |
| 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.c. */ |
| 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 |
| }; |
| |
| 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. */ |
| |
| static 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 |
| |
| static 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; |
| } |
| |
| static 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 */ |