[thirdparty/gcc.git] / gcc / gimple-streamer-out.c

/* Routines for emitting GIMPLE to a file stream.

   Copyright 2011 Free Software Foundation, Inc.
   Contributed by Diego Novillo <dnovillo@google.com>

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/>.  */

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tree.h"
#include "tree-flow.h"
#include "data-streamer.h"
#include "gimple-streamer.h"
#include "lto-streamer.h"
#include "tree-streamer.h"

/* Output PHI function PHI to the main stream in OB.  */

static void
output_phi (struct output_block *ob, gimple phi)
{
  unsigned i, len = gimple_phi_num_args (phi);

  output_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
  output_uleb128 (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));

  for (i = 0; i < len; i++)
    {
      stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
      output_uleb128 (ob, gimple_phi_arg_edge (phi, i)->src->index);
      lto_output_location (ob, gimple_phi_arg_location (phi, i));
    }
}


/* Emit statement STMT on the main stream of output block OB.  */

static void
output_gimple_stmt (struct output_block *ob, gimple stmt)
{
  unsigned i;
  enum gimple_code code;
  enum LTO_tags tag;
  struct bitpack_d bp;

  /* Emit identifying tag.  */
  code = gimple_code (stmt);
  tag = lto_gimple_code_to_tag (code);
  output_record_start (ob, tag);

  /* Emit the tuple header.  */
  bp = bitpack_create (ob->main_stream);
  bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
  bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
  if (is_gimple_assign (stmt))
    bp_pack_value (&bp, gimple_assign_nontemporal_move_p (stmt), 1);
  bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
  bp_pack_var_len_unsigned (&bp, stmt->gsbase.subcode);
  lto_output_bitpack (&bp);

  /* Emit location information for the statement.  */
  lto_output_location (ob, gimple_location (stmt));

  /* Emit the lexical block holding STMT.  */
  stream_write_tree (ob, gimple_block (stmt), true);

  /* Emit the operands.  */
  switch (gimple_code (stmt))
    {
    case GIMPLE_RESX:
      output_sleb128 (ob, gimple_resx_region (stmt));
      break;

    case GIMPLE_EH_MUST_NOT_THROW:
      stream_write_tree (ob, gimple_eh_must_not_throw_fndecl (stmt), true);
      break;

    case GIMPLE_EH_DISPATCH:
      output_sleb128 (ob, gimple_eh_dispatch_region (stmt));
      break;

    case GIMPLE_ASM:
      lto_output_uleb128_stream (ob->main_stream, gimple_asm_ninputs (stmt));
      lto_output_uleb128_stream (ob->main_stream, gimple_asm_noutputs (stmt));
      lto_output_uleb128_stream (ob->main_stream, gimple_asm_nclobbers (stmt));
      lto_output_uleb128_stream (ob->main_stream, gimple_asm_nlabels (stmt));
      lto_output_string (ob, ob->main_stream, gimple_asm_string (stmt), true);
      /* Fallthru  */

    case GIMPLE_ASSIGN:
    case GIMPLE_CALL:
    case GIMPLE_RETURN:
    case GIMPLE_SWITCH:
    case GIMPLE_LABEL:
    case GIMPLE_COND:
    case GIMPLE_GOTO:
    case GIMPLE_DEBUG:
      for (i = 0; i < gimple_num_ops (stmt); i++)
	{
	  tree op = gimple_op (stmt, i);
	  /* Wrap all uses of non-automatic variables inside MEM_REFs
	     so that we do not have to deal with type mismatches on
	     merged symbols during IL read in.  The first operand
	     of GIMPLE_DEBUG must be a decl, not MEM_REF, though.  */
	  if (op && (i || !is_gimple_debug (stmt)))
	    {
	      tree *basep = &op;
	      while (handled_component_p (*basep))
		basep = &TREE_OPERAND (*basep, 0);
	      if (TREE_CODE (*basep) == VAR_DECL
		  && !auto_var_in_fn_p (*basep, current_function_decl)
		  && !DECL_REGISTER (*basep))
		{
		  bool volatilep = TREE_THIS_VOLATILE (*basep);
		  *basep = build2 (MEM_REF, TREE_TYPE (*basep),
				   build_fold_addr_expr (*basep),
				   build_int_cst (build_pointer_type
						  (TREE_TYPE (*basep)), 0));
		  TREE_THIS_VOLATILE (*basep) = volatilep;
		}
	    }
	  stream_write_tree (ob, op, true);
	}
      if (is_gimple_call (stmt))
	{
	  if (gimple_call_internal_p (stmt))
	    lto_output_enum (ob->main_stream, internal_fn,
			     IFN_LAST, gimple_call_internal_fn (stmt));
	  else
	    stream_write_tree (ob, gimple_call_fntype (stmt), true);
	}
      break;

    case GIMPLE_NOP:
    case GIMPLE_PREDICT:
      break;

    default:
      gcc_unreachable ();
    }
}


/* Output a basic block BB to the main stream in OB for this FN.  */

void
output_bb (struct output_block *ob, basic_block bb, struct function *fn)
{
  gimple_stmt_iterator bsi = gsi_start_bb (bb);

  output_record_start (ob,
		       (!gsi_end_p (bsi)) || phi_nodes (bb)
		        ? LTO_bb1
			: LTO_bb0);

  output_uleb128 (ob, bb->index);
  output_sleb128 (ob, bb->count);
  output_sleb128 (ob, bb->loop_depth);
  output_sleb128 (ob, bb->frequency);
  output_sleb128 (ob, bb->flags);

  if (!gsi_end_p (bsi) || phi_nodes (bb))
    {
      /* Output the statements.  The list of statements is terminated
	 with a zero.  */
      for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
	{
	  int region;
	  gimple stmt = gsi_stmt (bsi);

	  output_gimple_stmt (ob, stmt);

	  /* Emit the EH region holding STMT.  */
	  region = lookup_stmt_eh_lp_fn (fn, stmt);
	  if (region != 0)
	    {
	      output_record_start (ob, LTO_eh_region);
	      output_sleb128 (ob, region);
	    }
	  else
	    output_record_start (ob, LTO_null);
	}

      output_record_start (ob, LTO_null);

      for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi))
	{
	  gimple phi = gsi_stmt (bsi);

	  /* Only emit PHIs for gimple registers.  PHI nodes for .MEM
	     will be filled in on reading when the SSA form is
	     updated.  */
	  if (is_gimple_reg (gimple_phi_result (phi)))
	    output_phi (ob, phi);
	}

      output_record_start (ob, LTO_null);
    }
}
Commit	Line	Data
2541503d	1	/* Routines for emitting GIMPLE to a file stream.
	2
	3	Copyright 2011 Free Software Foundation, Inc.
	4	Contributed by Diego Novillo <dnovillo@google.com>
	5
	6	This file is part of GCC.
	7
	8	GCC is free software; you can redistribute it and/or modify it under
	9	the terms of the GNU General Public License as published by the Free
	10	Software Foundation; either version 3, or (at your option) any later
	11	version.
	12
	13	GCC is distributed in the hope that it will be useful, but WITHOUT ANY
	14	WARRANTY; without even the implied warranty of MERCHANTABILITY or
	15	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	16	for more details.
	17
	18	You should have received a copy of the GNU General Public License
	19	along with GCC; see the file COPYING3. If not see
	20	<http://www.gnu.org/licenses/>. */
	21
	22	#include "config.h"
	23	#include "system.h"
	24	#include "coretypes.h"
	25	#include "tree.h"
	26	#include "tree-flow.h"
	27	#include "data-streamer.h"
	28	#include "gimple-streamer.h"
	29	#include "lto-streamer.h"
515cf651	30	#include "tree-streamer.h"
2541503d	31
	32	/* Output PHI function PHI to the main stream in OB. */
	33
	34	static void
	35	output_phi (struct output_block *ob, gimple phi)
	36	{
	37	unsigned i, len = gimple_phi_num_args (phi);
	38
	39	output_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
	40	output_uleb128 (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
	41
	42	for (i = 0; i < len; i++)
	43	{
515cf651	44	stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
2541503d	45	output_uleb128 (ob, gimple_phi_arg_edge (phi, i)->src->index);
	46	lto_output_location (ob, gimple_phi_arg_location (phi, i));
	47	}
	48	}
	49
	50
	51	/* Emit statement STMT on the main stream of output block OB. */
	52
	53	static void
	54	output_gimple_stmt (struct output_block *ob, gimple stmt)
	55	{
	56	unsigned i;
	57	enum gimple_code code;
	58	enum LTO_tags tag;
	59	struct bitpack_d bp;
	60
	61	/* Emit identifying tag. */
	62	code = gimple_code (stmt);
	63	tag = lto_gimple_code_to_tag (code);
	64	output_record_start (ob, tag);
	65
	66	/* Emit the tuple header. */
	67	bp = bitpack_create (ob->main_stream);
	68	bp_pack_var_len_unsigned (&bp, gimple_num_ops (stmt));
	69	bp_pack_value (&bp, gimple_no_warning_p (stmt), 1);
	70	if (is_gimple_assign (stmt))
	71	bp_pack_value (&bp, gimple_assign_nontemporal_move_p (stmt), 1);
	72	bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
	73	bp_pack_var_len_unsigned (&bp, stmt->gsbase.subcode);
	74	lto_output_bitpack (&bp);
	75
	76	/* Emit location information for the statement. */
	77	lto_output_location (ob, gimple_location (stmt));
	78
	79	/* Emit the lexical block holding STMT. */
515cf651	80	stream_write_tree (ob, gimple_block (stmt), true);
2541503d	81
	82	/* Emit the operands. */
	83	switch (gimple_code (stmt))
	84	{
	85	case GIMPLE_RESX:
	86	output_sleb128 (ob, gimple_resx_region (stmt));
	87	break;
	88
	89	case GIMPLE_EH_MUST_NOT_THROW:
515cf651	90	stream_write_tree (ob, gimple_eh_must_not_throw_fndecl (stmt), true);
2541503d	91	break;
	92
	93	case GIMPLE_EH_DISPATCH:
	94	output_sleb128 (ob, gimple_eh_dispatch_region (stmt));
	95	break;
	96
	97	case GIMPLE_ASM:
	98	lto_output_uleb128_stream (ob->main_stream, gimple_asm_ninputs (stmt));
	99	lto_output_uleb128_stream (ob->main_stream, gimple_asm_noutputs (stmt));
	100	lto_output_uleb128_stream (ob->main_stream, gimple_asm_nclobbers (stmt));
	101	lto_output_uleb128_stream (ob->main_stream, gimple_asm_nlabels (stmt));
	102	lto_output_string (ob, ob->main_stream, gimple_asm_string (stmt), true);
	103	/* Fallthru */
	104
	105	case GIMPLE_ASSIGN:
	106	case GIMPLE_CALL:
	107	case GIMPLE_RETURN:
	108	case GIMPLE_SWITCH:
	109	case GIMPLE_LABEL:
	110	case GIMPLE_COND:
	111	case GIMPLE_GOTO:
	112	case GIMPLE_DEBUG:
	113	for (i = 0; i < gimple_num_ops (stmt); i++)
	114	{
	115	tree op = gimple_op (stmt, i);
	116	/* Wrap all uses of non-automatic variables inside MEM_REFs
	117	so that we do not have to deal with type mismatches on
	118	merged symbols during IL read in. The first operand
	119	of GIMPLE_DEBUG must be a decl, not MEM_REF, though. */
	120	if (op && (i \|\| !is_gimple_debug (stmt)))
	121	{
	122	tree *basep = &op;
	123	while (handled_component_p (*basep))
	124	basep = &TREE_OPERAND (*basep, 0);
	125	if (TREE_CODE (*basep) == VAR_DECL
	126	&& !auto_var_in_fn_p (*basep, current_function_decl)
	127	&& !DECL_REGISTER (*basep))
	128	{
	129	bool volatilep = TREE_THIS_VOLATILE (*basep);
	130	basep = build2 (MEM_REF, TREE_TYPE (basep),
	131	build_fold_addr_expr (*basep),
	132	build_int_cst (build_pointer_type
	133	(TREE_TYPE (*basep)), 0));
	134	TREE_THIS_VOLATILE (*basep) = volatilep;
	135	}
	136	}
515cf651	137	stream_write_tree (ob, op, true);
2541503d	138	}
	139	if (is_gimple_call (stmt))
	140	{
	141	if (gimple_call_internal_p (stmt))
	142	lto_output_enum (ob->main_stream, internal_fn,
	143	IFN_LAST, gimple_call_internal_fn (stmt));
	144	else
515cf651	145	stream_write_tree (ob, gimple_call_fntype (stmt), true);
2541503d	146	}
	147	break;
	148
	149	case GIMPLE_NOP:
	150	case GIMPLE_PREDICT:
	151	break;
	152
	153	default:
	154	gcc_unreachable ();
	155	}
	156	}
	157
	158
	159	/* Output a basic block BB to the main stream in OB for this FN. */
	160
	161	void
	162	output_bb (struct output_block ob, basic_block bb, struct function fn)
	163	{
	164	gimple_stmt_iterator bsi = gsi_start_bb (bb);
	165
	166	output_record_start (ob,
	167	(!gsi_end_p (bsi)) \|\| phi_nodes (bb)
	168	? LTO_bb1
	169	: LTO_bb0);
	170
	171	output_uleb128 (ob, bb->index);
	172	output_sleb128 (ob, bb->count);
	173	output_sleb128 (ob, bb->loop_depth);
	174	output_sleb128 (ob, bb->frequency);
	175	output_sleb128 (ob, bb->flags);
	176
	177	if (!gsi_end_p (bsi) \|\| phi_nodes (bb))
	178	{
	179	/* Output the statements. The list of statements is terminated
	180	with a zero. */
	181	for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
	182	{
	183	int region;
	184	gimple stmt = gsi_stmt (bsi);
	185
	186	output_gimple_stmt (ob, stmt);
	187
	188	/* Emit the EH region holding STMT. */
	189	region = lookup_stmt_eh_lp_fn (fn, stmt);
	190	if (region != 0)
	191	{
	192	output_record_start (ob, LTO_eh_region);
	193	output_sleb128 (ob, region);
	194	}
	195	else
	196	output_record_start (ob, LTO_null);
	197	}
	198
	199	output_record_start (ob, LTO_null);
	200
	201	for (bsi = gsi_start_phis (bb); !gsi_end_p (bsi); gsi_next (&bsi))
	202	{
	203	gimple phi = gsi_stmt (bsi);
	204
	205	/* Only emit PHIs for gimple registers. PHI nodes for .MEM
	206	will be filled in on reading when the SSA form is
	207	updated. */
	208	if (is_gimple_reg (gimple_phi_result (phi)))
	209	output_phi (ob, phi);
210	}
211
212	output_record_start (ob, LTO_null);
213	}
214	}