path: root/gcc/expr.h

/* Definitions for code generation pass of GNU compiler.
   Copyright (C) 1987-2014 Free Software Foundation, Inc.

This file is part of GCC.

GCC 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.

GCC 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 GCC; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  */

#ifndef GCC_EXPR_H
#define GCC_EXPR_H

/* For inhibit_defer_pop */
#include "hashtab.h"
#include "hash-set.h"
#include "vec.h"
#include "machmode.h"
#include "tm.h"
#include "hard-reg-set.h"
#include "input.h"
#include "function.h"
/* For XEXP, GEN_INT, rtx_code */
#include "rtl.h"
/* For optimize_size */
#include "flags.h"
/* For tree_fits_[su]hwi_p, tree_to_[su]hwi, fold_convert, size_binop,
   ssize_int, TREE_CODE, TYPE_SIZE, int_size_in_bytes,    */
#include "tree-core.h"
/* For GET_MODE_BITSIZE, word_mode */
#include "insn-config.h"

/* This is the 4th arg to `expand_expr'.
   EXPAND_STACK_PARM means we are possibly expanding a call param onto
   the stack.
   EXPAND_SUM means it is ok to return a PLUS rtx or MULT rtx.
   EXPAND_INITIALIZER is similar but also record any labels on forced_labels.
   EXPAND_CONST_ADDRESS means it is ok to return a MEM whose address
    is a constant that is not a legitimate address.
   EXPAND_WRITE means we are only going to write to the resulting rtx.
   EXPAND_MEMORY means we are interested in a memory result, even if
    the memory is constant and we could have propagated a constant value,
    or the memory is unaligned on a STRICT_ALIGNMENT target.  */
enum expand_modifier {EXPAND_NORMAL = 0, EXPAND_STACK_PARM, EXPAND_SUM,
		      EXPAND_CONST_ADDRESS, EXPAND_INITIALIZER, EXPAND_WRITE,
		      EXPAND_MEMORY};

/* Prevent the compiler from deferring stack pops.  See
   inhibit_defer_pop for more information.  */
#define NO_DEFER_POP (inhibit_defer_pop += 1)

/* Allow the compiler to defer stack pops.  See inhibit_defer_pop for
   more information.  */
#define OK_DEFER_POP (inhibit_defer_pop -= 1)

/* This structure is used to pass around information about exploded
   unary, binary and trinary expressions between expand_expr_real_1 and
   friends.  */
typedef struct separate_ops
{
  enum tree_code code;
  location_t location;
  tree type;
  tree op0, op1, op2;
} *sepops;

/* Functions from expmed.c:  */

/* Arguments MODE, RTX: return an rtx for the negation of that value.
   May emit insns.  */
extern rtx negate_rtx (machine_mode, rtx);

/* Expand a logical AND operation.  */
extern rtx expand_and (machine_mode, rtx, rtx, rtx);

/* Emit a store-flag operation.  */
extern rtx emit_store_flag (rtx, enum rtx_code, rtx, rtx, machine_mode,
			    int, int);

/* Like emit_store_flag, but always succeeds.  */
extern rtx emit_store_flag_force (rtx, enum rtx_code, rtx, rtx,
				  machine_mode, int, int);

/* Choose a minimal N + 1 bit approximation to 1/D that can be used to
   replace division by D, and put the least significant N bits of the result
   in *MULTIPLIER_PTR and return the most significant bit.  */
extern unsigned HOST_WIDE_INT choose_multiplier (unsigned HOST_WIDE_INT, int,
						 int, unsigned HOST_WIDE_INT *,
						 int *, int *);

/* Functions from expr.c:  */

/* This is run during target initialization to set up which modes can be
   used directly in memory and to initialize the block move optab.  */
extern void init_expr_target (void);

/* This is run at the start of compiling a function.  */
extern void init_expr (void);

/* Emit some rtl insns to move data between rtx's, converting machine modes.
   Both modes must be floating or both fixed.  */
extern void convert_move (rtx, rtx, int);

/* Convert an rtx to specified machine mode and return the result.  */
extern rtx convert_to_mode (machine_mode, rtx, int);

/* Convert an rtx to MODE from OLDMODE and return the result.  */
extern rtx convert_modes (machine_mode, machine_mode, rtx, int);

/* Emit code to move a block Y to a block X.  */

enum block_op_methods
{
  BLOCK_OP_NORMAL,
  BLOCK_OP_NO_LIBCALL,
  BLOCK_OP_CALL_PARM,
  /* Like BLOCK_OP_NORMAL, but the libcall can be tail call optimized.  */
  BLOCK_OP_TAILCALL
};

extern GTY(()) tree block_clear_fn;
extern void init_block_move_fn (const char *);
extern void init_block_clear_fn (const char *);

extern rtx emit_block_move (rtx, rtx, rtx, enum block_op_methods);
extern rtx emit_block_move_via_libcall (rtx, rtx, rtx, bool);
extern rtx emit_block_move_hints (rtx, rtx, rtx, enum block_op_methods,
			          unsigned int, HOST_WIDE_INT,
				  unsigned HOST_WIDE_INT,
				  unsigned HOST_WIDE_INT,
				  unsigned HOST_WIDE_INT);
extern bool emit_storent_insn (rtx to, rtx from);

/* Copy all or part of a value X into registers starting at REGNO.
   The number of registers to be filled is NREGS.  */
extern void move_block_to_reg (int, rtx, int, machine_mode);

/* Copy all or part of a BLKmode value X out of registers starting at REGNO.
   The number of registers to be filled is NREGS.  */
extern void move_block_from_reg (int, rtx, int);

/* Generate a non-consecutive group of registers represented by a PARALLEL.  */
extern rtx gen_group_rtx (rtx);

/* Load a BLKmode value into non-consecutive registers represented by a
   PARALLEL.  */
extern void emit_group_load (rtx, rtx, tree, int);

/* Similarly, but load into new temporaries.  */
extern rtx emit_group_load_into_temps (rtx, rtx, tree, int);

/* Move a non-consecutive group of registers represented by a PARALLEL into
   a non-consecutive group of registers represented by a PARALLEL.  */
extern void emit_group_move (rtx, rtx);

/* Move a group of registers represented by a PARALLEL into pseudos.  */
extern rtx emit_group_move_into_temps (rtx);

/* Store a BLKmode value from non-consecutive registers represented by a
   PARALLEL.  */
extern void emit_group_store (rtx, rtx, tree, int);

extern rtx maybe_emit_group_store (rtx, tree);

/* Copy BLKmode object from a set of registers.  */
extern void copy_blkmode_from_reg (rtx, rtx, tree);

/* Mark REG as holding a parameter for the next CALL_INSN.
   Mode is TYPE_MODE of the non-promoted parameter, or VOIDmode.  */
extern void use_reg_mode (rtx *, rtx, machine_mode);
extern void clobber_reg_mode (rtx *, rtx, machine_mode);

extern rtx copy_blkmode_to_reg (machine_mode, tree);

/* Mark REG as holding a parameter for the next CALL_INSN.  */
static inline void
use_reg (rtx *fusage, rtx reg)
{
  use_reg_mode (fusage, reg, VOIDmode);
}

/* Mark REG as clobbered by the call with FUSAGE as CALL_INSN_FUNCTION_USAGE.  */
static inline void
clobber_reg (rtx *fusage, rtx reg)
{
  clobber_reg_mode (fusage, reg, VOIDmode);
}

/* Mark NREGS consecutive regs, starting at REGNO, as holding parameters
   for the next CALL_INSN.  */
extern void use_regs (rtx *, int, int);

/* Mark a PARALLEL as holding a parameter for the next CALL_INSN.  */
extern void use_group_regs (rtx *, rtx);

/* Write zeros through the storage of OBJECT.
   If OBJECT has BLKmode, SIZE is its length in bytes.  */
extern rtx clear_storage (rtx, rtx, enum block_op_methods);
extern rtx clear_storage_hints (rtx, rtx, enum block_op_methods,
			        unsigned int, HOST_WIDE_INT,
				unsigned HOST_WIDE_INT,
				unsigned HOST_WIDE_INT,
				unsigned HOST_WIDE_INT);
/* The same, but always output an library call.  */
rtx set_storage_via_libcall (rtx, rtx, rtx, bool);

/* Expand a setmem pattern; return true if successful.  */
extern bool set_storage_via_setmem (rtx, rtx, rtx, unsigned int,
				    unsigned int, HOST_WIDE_INT,
				    unsigned HOST_WIDE_INT,
				    unsigned HOST_WIDE_INT,
				    unsigned HOST_WIDE_INT);

extern unsigned HOST_WIDE_INT move_by_pieces_ninsns (unsigned HOST_WIDE_INT,
						     unsigned int,
						     unsigned int);

/* Return nonzero if it is desirable to store LEN bytes generated by
   CONSTFUN with several move instructions by store_by_pieces
   function.  CONSTFUNDATA is a pointer which will be passed as argument
   in every CONSTFUN call.
   ALIGN is maximum alignment we can assume.
   MEMSETP is true if this is a real memset/bzero, not a copy
   of a const string.  */
extern int can_store_by_pieces (unsigned HOST_WIDE_INT,
				rtx (*) (void *, HOST_WIDE_INT,
					 machine_mode),
				void *, unsigned int, bool);

/* Generate several move instructions to store LEN bytes generated by
   CONSTFUN to block TO.  (A MEM rtx with BLKmode).  CONSTFUNDATA is a
   pointer which will be passed as argument in every CONSTFUN call.
   ALIGN is maximum alignment we can assume.
   MEMSETP is true if this is a real memset/bzero, not a copy.
   Returns TO + LEN.  */
extern rtx store_by_pieces (rtx, unsigned HOST_WIDE_INT,
			    rtx (*) (void *, HOST_WIDE_INT, machine_mode),
			    void *, unsigned int, bool, int);

/* Emit insns to set X from Y.  */
extern rtx_insn *emit_move_insn (rtx, rtx);
extern rtx gen_move_insn (rtx, rtx);

/* Emit insns to set X from Y, with no frills.  */
extern rtx_insn *emit_move_insn_1 (rtx, rtx);

extern rtx_insn *emit_move_complex_push (machine_mode, rtx, rtx);
extern rtx_insn *emit_move_complex_parts (rtx, rtx);
extern void write_complex_part (rtx, rtx, bool);
extern rtx emit_move_resolve_push (machine_mode, rtx);

/* Push a block of length SIZE (perhaps variable)
   and return an rtx to address the beginning of the block.  */
extern rtx push_block (rtx, int, int);

/* Generate code to push something onto the stack, given its mode and type.  */
extern void emit_push_insn (rtx, machine_mode, tree, rtx, unsigned int,
			    int, rtx, int, rtx, rtx, int, rtx);

/* Expand an assignment that stores the value of FROM into TO.  */
extern void expand_assignment (tree, tree, bool);

/* Generate code for computing expression EXP,
   and storing the value into TARGET.
   If SUGGEST_REG is nonzero, copy the value through a register
   and return that register, if that is possible.  */
extern rtx store_expr_with_bounds (tree, rtx, int, bool, tree);
extern rtx store_expr (tree, rtx, int, bool);

/* Given an rtx that may include add and multiply operations,
   generate them as insns and return a pseudo-reg containing the value.
   Useful after calling expand_expr with 1 as sum_ok.  */
extern rtx force_operand (rtx, rtx);

/* Work horses for expand_expr.  */
extern rtx expand_expr_real (tree, rtx, machine_mode,
			     enum expand_modifier, rtx *, bool);
extern rtx expand_expr_real_1 (tree, rtx, machine_mode,
			       enum expand_modifier, rtx *, bool);
extern rtx expand_expr_real_2 (sepops, rtx, machine_mode,
			       enum expand_modifier);

/* Generate code for computing expression EXP.
   An rtx for the computed value is returned.  The value is never null.
   In the case of a void EXP, const0_rtx is returned.  */
static inline rtx
expand_expr (tree exp, rtx target, machine_mode mode,
	     enum expand_modifier modifier)
{
  return expand_expr_real (exp, target, mode, modifier, NULL, false);
}

static inline rtx
expand_normal (tree exp)
{
  return expand_expr_real (exp, NULL_RTX, VOIDmode, EXPAND_NORMAL, NULL, false);
}

/* At the start of a function, record that we have no previously-pushed
   arguments waiting to be popped.  */
extern void init_pending_stack_adjust (void);

/* Discard any pending stack adjustment.  */
extern void discard_pending_stack_adjust (void);

/* When exiting from function, if safe, clear out any pending stack adjust
   so the adjustment won't get done.  */
extern void clear_pending_stack_adjust (void);

/* Pop any previously-pushed arguments that have not been popped yet.  */
extern void do_pending_stack_adjust (void);

/* Struct for saving/restoring of pending_stack_adjust/stack_pointer_delta
   values.  */

struct saved_pending_stack_adjust
{
  /* Saved value of pending_stack_adjust.  */
  int x_pending_stack_adjust;

  /* Saved value of stack_pointer_delta.  */
  int x_stack_pointer_delta;
};

/* Remember pending_stack_adjust/stack_pointer_delta.
   To be used around code that may call do_pending_stack_adjust (),
   but the generated code could be discarded e.g. using delete_insns_since.  */

extern void save_pending_stack_adjust (saved_pending_stack_adjust *);

/* Restore the saved pending_stack_adjust/stack_pointer_delta.  */

extern void restore_pending_stack_adjust (saved_pending_stack_adjust *);

/* Return the tree node and offset if a given argument corresponds to
   a string constant.  */
extern tree string_constant (tree, tree *);

/* Generate code to evaluate EXP and jump to LABEL if the value is zero.  */
extern void jumpifnot (tree, rtx, int);
extern void jumpifnot_1 (enum tree_code, tree, tree, rtx, int);

/* Generate code to evaluate EXP and jump to LABEL if the value is nonzero.  */
extern void jumpif (tree, rtx, int);
extern void jumpif_1 (enum tree_code, tree, tree, rtx, int);

/* Generate code to evaluate EXP and jump to IF_FALSE_LABEL if
   the result is zero, or IF_TRUE_LABEL if the result is one.  */
extern void do_jump (tree, rtx, rtx, int);
extern void do_jump_1 (enum tree_code, tree, tree, rtx, rtx, int);

extern void do_compare_rtx_and_jump (rtx, rtx, enum rtx_code, int,
				     machine_mode, rtx, rtx, rtx, int);

/* Two different ways of generating switch statements.  */
extern int try_casesi (tree, tree, tree, tree, rtx, rtx, rtx, int);
extern int try_tablejump (tree, tree, tree, tree, rtx, rtx, int);

/* Functions from alias.c */
#include "alias.h"


/* rtl.h and tree.h were included.  */
/* Return an rtx for the size in bytes of the value of an expr.  */
extern rtx expr_size (tree);

/* Return a wide integer for the size in bytes of the value of EXP, or -1
   if the size can vary or is larger than an integer.  */
extern HOST_WIDE_INT int_expr_size (tree);

/* Return an rtx that refers to the value returned by a function
   in its original home.  This becomes invalid if any more code is emitted.  */
extern rtx hard_function_value (const_tree, const_tree, const_tree, int);

extern rtx prepare_call_address (tree, rtx, rtx, rtx *, int, int);

extern bool shift_return_value (machine_mode, bool, rtx);

extern rtx expand_call (tree, rtx, int);

extern void fixup_tail_calls (void);

#ifdef TREE_CODE
extern rtx expand_variable_shift (enum tree_code, machine_mode,
				  rtx, tree, rtx, int);
extern rtx expand_shift (enum tree_code, machine_mode, rtx, int, rtx,
			     int);
extern rtx expand_divmod (int, enum tree_code, machine_mode, rtx, rtx,
			  rtx, int);
#endif

/* Return the CODE_LABEL rtx for a LABEL_DECL, creating it if necessary.  */
extern rtx label_rtx (tree);

/* As label_rtx, but additionally the label is placed on the forced label
   list of its containing function (i.e. it is treated as reachable even
   if how is not obvious).  */
extern rtx force_label_rtx (tree);

/* Return an rtx like arg but sans any constant terms.
   Returns the original rtx if it has no constant terms.
   The constant terms are added and stored via a second arg.  */
extern rtx eliminate_constant_term (rtx, rtx *);

/* Convert arg to a valid memory address for specified machine mode that points
   to a specific named address space, by emitting insns to perform arithmetic
   if necessary.  */
extern rtx memory_address_addr_space (machine_mode, rtx, addr_space_t);

/* Like memory_address_addr_space, except assume the memory address points to
   the generic named address space.  */
#define memory_address(MODE,RTX) \
	memory_address_addr_space ((MODE), (RTX), ADDR_SPACE_GENERIC)

/* Return a memory reference like MEMREF, but with its mode changed
   to MODE and its address changed to ADDR.
   (VOIDmode means don't change the mode.
   NULL for ADDR means don't change the address.)  */
extern rtx change_address (rtx, machine_mode, rtx);

/* Return a memory reference like MEMREF, but with its mode changed
   to MODE and its address offset by OFFSET bytes.  */
#define adjust_address(MEMREF, MODE, OFFSET) \
  adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 0, 0)

/* Likewise, but the reference is not required to be valid.  */
#define adjust_address_nv(MEMREF, MODE, OFFSET) \
  adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 0, 0)

/* Return a memory reference like MEMREF, but with its mode changed
   to MODE and its address offset by OFFSET bytes.  Assume that it's
   for a bitfield and conservatively drop the underlying object if we
   cannot be sure to stay within its bounds.  */
#define adjust_bitfield_address(MEMREF, MODE, OFFSET) \
  adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, 0)

/* As for adjust_bitfield_address, but specify that the width of
   BLKmode accesses is SIZE bytes.  */
#define adjust_bitfield_address_size(MEMREF, MODE, OFFSET, SIZE) \
  adjust_address_1 (MEMREF, MODE, OFFSET, 1, 1, 1, SIZE)

/* Likewise, but the reference is not required to be valid.  */
#define adjust_bitfield_address_nv(MEMREF, MODE, OFFSET) \
  adjust_address_1 (MEMREF, MODE, OFFSET, 0, 1, 1, 0)

/* Return a memory reference like MEMREF, but with its mode changed
   to MODE and its address changed to ADDR, which is assumed to be
   increased by OFFSET bytes from MEMREF.  */
#define adjust_automodify_address(MEMREF, MODE, ADDR, OFFSET) \
  adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 1)

/* Likewise, but the reference is not required to be valid.  */
#define adjust_automodify_address_nv(MEMREF, MODE, ADDR, OFFSET) \
  adjust_automodify_address_1 (MEMREF, MODE, ADDR, OFFSET, 0)

extern rtx adjust_address_1 (rtx, machine_mode, HOST_WIDE_INT, int, int,
			     int, HOST_WIDE_INT);
extern rtx adjust_automodify_address_1 (rtx, machine_mode, rtx,
					HOST_WIDE_INT, int);

/* Return a memory reference like MEMREF, but whose address is changed by
   adding OFFSET, an RTX, to it.  POW2 is the highest power of two factor
   known to be in OFFSET (possibly 1).  */
extern rtx offset_address (rtx, rtx, unsigned HOST_WIDE_INT);

/* Definitions from emit-rtl.c */
#include "emit-rtl.h"

/* Return a memory reference like MEMREF, but with its mode widened to
   MODE and adjusted by OFFSET.  */
extern rtx widen_memory_access (rtx, machine_mode, HOST_WIDE_INT);

/* Return a memory reference like MEMREF, but which is known to have a
   valid address.  */
extern rtx validize_mem (rtx);

extern rtx use_anchored_address (rtx);

/* Given REF, a MEM, and T, either the type of X or the expression
   corresponding to REF, set the memory attributes.  OBJECTP is nonzero
   if we are making a new object of this type.  */
extern void set_mem_attributes (rtx, tree, int);

/* Similar, except that BITPOS has not yet been applied to REF, so if
   we alter MEM_OFFSET according to T then we should subtract BITPOS
   expecting that it'll be added back in later.  */
extern void set_mem_attributes_minus_bitpos (rtx, tree, int, HOST_WIDE_INT);

/* Return OFFSET if XEXP (MEM, 0) - OFFSET is known to be ALIGN
   bits aligned for 0 <= OFFSET < ALIGN / BITS_PER_UNIT, or
   -1 if not known.  */
extern int get_mem_align_offset (rtx, unsigned int);

/* Assemble the static constant template for function entry trampolines.  */
extern rtx assemble_trampoline_template (void);

/* Copy given rtx to a new temp reg and return that.  */
extern rtx copy_to_reg (rtx);

/* Like copy_to_reg but always make the reg Pmode.  */
extern rtx copy_addr_to_reg (rtx);

/* Like copy_to_reg but always make the reg the specified mode MODE.  */
extern rtx copy_to_mode_reg (machine_mode, rtx);

/* Copy given rtx to given temp reg and return that.  */
extern rtx copy_to_suggested_reg (rtx, rtx, machine_mode);

/* Copy a value to a register if it isn't already a register.
   Args are mode (in case value is a constant) and the value.  */
extern rtx force_reg (machine_mode, rtx);

/* Return given rtx, copied into a new temp reg if it was in memory.  */
extern rtx force_not_mem (rtx);

/* Return mode and signedness to use when an argument or result in the
   given mode is promoted.  */
extern machine_mode promote_function_mode (const_tree, machine_mode, int *,
					        const_tree, int);

/* Return mode and signedness to use when an object in the given mode
   is promoted.  */
extern machine_mode promote_mode (const_tree, machine_mode, int *);

/* Return mode and signedness to use when object is promoted.  */
machine_mode promote_decl_mode (const_tree, int *);

/* Remove some bytes from the stack.  An rtx says how many.  */
extern void adjust_stack (rtx);

/* Add some bytes to the stack.  An rtx says how many.  */
extern void anti_adjust_stack (rtx);

/* Add some bytes to the stack while probing it.  An rtx says how many. */
extern void anti_adjust_stack_and_probe (rtx, bool);

/* This enum is used for the following two functions.  */
enum save_level {SAVE_BLOCK, SAVE_FUNCTION, SAVE_NONLOCAL};

/* Save the stack pointer at the specified level.  */
extern void emit_stack_save (enum save_level, rtx *);

/* Restore the stack pointer from a save area of the specified level.  */
extern void emit_stack_restore (enum save_level, rtx);

/* Invoke emit_stack_save for the nonlocal_goto_save_area.  */
extern void update_nonlocal_goto_save_area (void);

/* Allocate some space on the stack dynamically and return its address.  */
extern rtx allocate_dynamic_stack_space (rtx, unsigned, unsigned, bool);

/* Emit one stack probe at ADDRESS, an address within the stack.  */
extern void emit_stack_probe (rtx);

/* Probe a range of stack addresses from FIRST to FIRST+SIZE, inclusive.
   FIRST is a constant and size is a Pmode RTX.  These are offsets from
   the current stack pointer.  STACK_GROWS_DOWNWARD says whether to add
   or subtract them from the stack pointer.  */
extern void probe_stack_range (HOST_WIDE_INT, rtx);

/* Return an rtx that refers to the value returned by a library call
   in its original home.  This becomes invalid if any more code is emitted.  */
extern rtx hard_libcall_value (machine_mode, rtx);

extern void store_bit_field (rtx, unsigned HOST_WIDE_INT,
			     unsigned HOST_WIDE_INT,
			     unsigned HOST_WIDE_INT,
			     unsigned HOST_WIDE_INT,
			     machine_mode, rtx);
extern rtx extract_bit_field (rtx, unsigned HOST_WIDE_INT,
			      unsigned HOST_WIDE_INT, int, rtx,
			      machine_mode, machine_mode);
extern rtx extract_low_bits (machine_mode, machine_mode, rtx);
extern rtx expand_mult (machine_mode, rtx, rtx, rtx, int);
extern rtx expand_mult_highpart_adjust (machine_mode, rtx, rtx, rtx, rtx, int);

extern rtx assemble_static_space (unsigned HOST_WIDE_INT);
extern int safe_from_p (const_rtx, tree, int);
extern bool split_comparison (enum rtx_code, machine_mode,
			      enum rtx_code *, enum rtx_code *);

/* Get the personality libfunc for a function decl.  */
rtx get_personality_function (tree);


/* In stmt.c */

/* Expand a GIMPLE_SWITCH statement.  */
extern void expand_case (gswitch *);

/* Like expand_case but special-case for SJLJ exception dispatching.  */
extern void expand_sjlj_dispatch_table (rtx, vec<tree> );

/* Determine whether the LEN bytes can be moved by using several move
   instructions.  Return nonzero if a call to move_by_pieces should
   succeed.  */
extern int can_move_by_pieces (unsigned HOST_WIDE_INT, unsigned int);

extern unsigned HOST_WIDE_INT highest_pow2_factor (const_tree);
bool array_at_struct_end_p (tree);

/* Return a tree of sizetype representing the size, in bytes, of the element
   of EXP, an ARRAY_REF or an ARRAY_RANGE_REF.  */
extern tree array_ref_element_size (tree);

extern bool categorize_ctor_elements (const_tree, HOST_WIDE_INT *,
				      HOST_WIDE_INT *, bool *);

/* Return a tree representing the offset, in bytes, of the field referenced
   by EXP.  This does not include any offset in DECL_FIELD_BIT_OFFSET.  */
extern tree component_ref_field_offset (tree);

extern void expand_operands (tree, tree, rtx, rtx*, rtx*,
			     enum expand_modifier);
#endif /* GCC_EXPR_H */