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/* Routines for emitting GIMPLE to a file stream.
Copyright (C) 2011-2024 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 "backend.h"
#include "tree.h"
#include "gimple.h"
#include "gimple-ssa.h"
#include "gimple-streamer.h"
#include "tree-eh.h"
#include "gimple-iterator.h"
#include "cgraph.h"
#include "value-prof.h"
#include "gimple-pretty-print.h"
/* Output PHI function PHI to the main stream in OB. */
static void
output_phi (struct output_block *ob, gphi *phi)
{
unsigned i, len = gimple_phi_num_args (phi);
streamer_write_record_start (ob, lto_gimple_code_to_tag (GIMPLE_PHI));
streamer_write_uhwi (ob, SSA_NAME_VERSION (PHI_RESULT (phi)));
for (i = 0; i < len; i++)
{
stream_write_tree (ob, gimple_phi_arg_def (phi, i), true);
streamer_write_uhwi (ob, gimple_phi_arg_edge (phi, i)->src->index);
bitpack_d bp = bitpack_create (ob->main_stream);
location_t loc = gimple_phi_arg_location (phi, i);
stream_output_location_and_block (ob, &bp, loc);
}
}
/* Emit statement STMT on the main stream of output block OB. */
static void
output_gimple_stmt (struct output_block *ob, struct function *fn, gimple *stmt)
{
unsigned i;
enum gimple_code code;
enum LTO_tags tag;
struct bitpack_d bp;
histogram_value hist;
/* Emit identifying tag. */
code = gimple_code (stmt);
tag = lto_gimple_code_to_tag (code);
streamer_write_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 (
as_a <gassign *> (stmt)),
1);
bp_pack_value (&bp, gimple_has_volatile_ops (stmt), 1);
hist = gimple_histogram_value (fn, stmt);
bp_pack_value (&bp, hist != NULL, 1);
bp_pack_var_len_unsigned (&bp, stmt->subcode);
/* Emit location information for the statement, including gimple_block. */
stream_output_location_and_block (ob, &bp, gimple_location (stmt));
/* Emit the operands. */
switch (gimple_code (stmt))
{
case GIMPLE_RESX:
streamer_write_hwi (ob, gimple_resx_region (as_a <gresx *> (stmt)));
break;
case GIMPLE_EH_MUST_NOT_THROW:
stream_write_tree (ob,
gimple_eh_must_not_throw_fndecl (
as_a <geh_mnt *> (stmt)),
true);
break;
case GIMPLE_EH_DISPATCH:
streamer_write_hwi (ob,
gimple_eh_dispatch_region (
as_a <geh_dispatch *> (stmt)));
break;
case GIMPLE_ASM:
{
gasm *asm_stmt = as_a <gasm *> (stmt);
streamer_write_uhwi (ob, gimple_asm_ninputs (asm_stmt));
streamer_write_uhwi (ob, gimple_asm_noutputs (asm_stmt));
streamer_write_uhwi (ob, gimple_asm_nclobbers (asm_stmt));
streamer_write_uhwi (ob, gimple_asm_nlabels (asm_stmt));
streamer_write_string (ob, ob->main_stream,
gimple_asm_string (asm_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);
tree *basep = NULL;
/* 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 (!flag_wpa && op && (i || !is_gimple_debug (stmt)))
{
basep = &op;
if (TREE_CODE (*basep) == ADDR_EXPR)
basep = &TREE_OPERAND (*basep, 0);
while (handled_component_p (*basep))
basep = &TREE_OPERAND (*basep, 0);
if (VAR_P (*basep)
&& !auto_var_in_fn_p (*basep, fn->decl)
&& !DECL_REGISTER (*basep))
{
bool volatilep = TREE_THIS_VOLATILE (*basep);
tree ptrtype = build_pointer_type (TREE_TYPE (*basep));
*basep = build2 (MEM_REF, TREE_TYPE (*basep),
build1 (ADDR_EXPR, ptrtype, *basep),
build_int_cst (ptrtype, 0));
TREE_THIS_VOLATILE (*basep) = volatilep;
}
else
basep = NULL;
}
stream_write_tree (ob, op, true);
/* Restore the original base if we wrapped it inside a MEM_REF. */
if (basep)
*basep = TREE_OPERAND (TREE_OPERAND (*basep, 0), 0);
}
if (is_gimple_call (stmt))
{
if (gimple_call_internal_p (stmt))
streamer_write_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;
case GIMPLE_TRANSACTION:
{
gtransaction *txn = as_a <gtransaction *> (stmt);
gcc_assert (gimple_transaction_body (txn) == NULL);
stream_write_tree (ob, gimple_transaction_label_norm (txn), true);
stream_write_tree (ob, gimple_transaction_label_uninst (txn), true);
stream_write_tree (ob, gimple_transaction_label_over (txn), true);
}
break;
default:
gcc_unreachable ();
}
if (hist)
stream_out_histogram_value (ob, hist);
}
/* 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);
streamer_write_record_start (ob,
(!gsi_end_p (bsi)) || phi_nodes (bb)
? LTO_bb1
: LTO_bb0);
streamer_write_uhwi (ob, bb->index);
bb->count.stream_out (ob);
streamer_write_hwi (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);
if (streamer_dump_file)
{
fprintf (streamer_dump_file, " Streaming gimple stmt ");
print_gimple_stmt (streamer_dump_file, stmt, 0, TDF_SLIM);
}
output_gimple_stmt (ob, fn, stmt);
/* Emit the EH region holding STMT. */
region = lookup_stmt_eh_lp_fn (fn, stmt);
if (region != 0)
{
streamer_write_record_start (ob, LTO_eh_region);
streamer_write_hwi (ob, region);
}
else
streamer_write_record_start (ob, LTO_null);
}
streamer_write_record_start (ob, LTO_null);
for (gphi_iterator psi = gsi_start_phis (bb);
!gsi_end_p (psi);
gsi_next (&psi))
{
gphi *phi = psi.phi ();
/* Only emit PHIs for gimple registers. PHI nodes for .MEM
will be filled in on reading when the SSA form is
updated. */
if (!virtual_operand_p (gimple_phi_result (phi)))
output_phi (ob, phi);
}
streamer_write_record_start (ob, LTO_null);
}
}
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