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/* Data structure definitions for a generic GCC target.
Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
2011
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-modes.h"
#ifdef ENABLE_CHECKING
typedef struct { void *magic; void *p; } cumulative_args_t;
#else /* !ENABLE_CHECKING */
/* 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 !ENABLE_CHECKING compilation. */
typedef union { void *p; } cumulative_args_t;
#endif /* !ENABLE_CHECKING */
/* Types used by the record_gcc_switches() target function. */
typedef enum
{
SWITCH_TYPE_PASSED, /* A switch passed on the command line. */
SWITCH_TYPE_ENABLED, /* An option that is currently enabled. */
SWITCH_TYPE_DESCRIPTIVE, /* Descriptive text, not a switch or option. */
SWITCH_TYPE_LINE_START, /* Please emit any necessary text at the start of a line. */
SWITCH_TYPE_LINE_END /* Please emit a line terminator. */
}
print_switch_type;
typedef int (* print_switch_fn_type) (print_switch_type, const char *);
/* An example implementation for ELF targets. Defined in varasm.c */
extern int elf_record_gcc_switches (print_switch_type type, 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);
struct stdarg_info;
struct spec_info_def;
/* The struct used by the secondary_reload target hook. */
typedef 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. */
} secondary_reload_info;
/* This is defined in sched-int.h . */
struct _dep;
/* This is defined in ddg.h . */
struct ddg;
/* This is defined in cfgloop.h . */
struct loop;
/* This is defined in tree-ssa-alias.h. */
struct ao_ref_s;
/* Assembler instructions for creating various kinds of integer object. */
struct asm_int_op
{
const char *hi;
const char *si;
const char *di;
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,
unaligned_load,
unaligned_store,
vector_store,
vec_to_scalar,
scalar_to_vec,
cond_branch_not_taken,
cond_branch_taken,
vec_perm
};
/* 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;
#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)
{
#ifdef ENABLE_CHECKING
gcc_assert (arg.magic == CUMULATIVE_ARGS_MAGIC);
#endif /* ENABLE_CHECKING */
return (CUMULATIVE_ARGS *) arg.p;
}
static inline cumulative_args_t
pack_cumulative_args (CUMULATIVE_ARGS *arg)
{
cumulative_args_t ret;
#ifdef ENABLE_CHECKING
ret.magic = CUMULATIVE_ARGS_MAGIC;
#endif /* ENABLE_CHECKING */
ret.p = (void *) arg;
return ret;
}
#endif /* GCC_TM_H */
#endif /* GCC_TARGET_H */
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