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/* Print RTL functions for GCC.
Copyright (C) 2016-2021 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/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "rtl.h"
#include "alias.h"
#include "tree.h"
#include "flags.h"
#include "predict.h"
#include "function.h"
#include "basic-block.h"
#include "print-rtl.h"
#include "langhooks.h"
#include "memmodel.h"
#include "emit-rtl.h"
#include "varasm.h"
/* Print an "(edge-from)" or "(edge-to)" directive describing E
to OUTFILE. */
static void
print_edge (FILE *outfile, edge e, bool from)
{
fprintf (outfile, " (%s ", from ? "edge-from" : "edge-to");
basic_block bb = from ? e->src : e->dest;
gcc_assert (bb);
switch (bb->index)
{
case ENTRY_BLOCK:
fprintf (outfile, "entry");
break;
case EXIT_BLOCK:
fprintf (outfile, "exit");
break;
default:
fprintf (outfile, "%i", bb->index);
break;
}
/* Express edge flags as a string with " | " separator.
e.g. (flags "FALLTHRU | DFS_BACK"). */
if (e->flags)
{
fprintf (outfile, " (flags \"");
bool seen_flag = false;
#define DEF_EDGE_FLAG(NAME,IDX) \
do { \
if (e->flags & EDGE_##NAME) \
{ \
if (seen_flag) \
fprintf (outfile, " | "); \
fprintf (outfile, "%s", (#NAME)); \
seen_flag = true; \
} \
} while (0);
#include "cfg-flags.def"
#undef DEF_EDGE_FLAG
fprintf (outfile, "\")");
}
fprintf (outfile, ")\n");
}
/* If BB is non-NULL, print the start of a "(block)" directive for it
to OUTFILE, otherwise do nothing. */
static void
begin_any_block (FILE *outfile, basic_block bb)
{
if (!bb)
return;
edge e;
edge_iterator ei;
fprintf (outfile, " (block %i\n", bb->index);
FOR_EACH_EDGE (e, ei, bb->preds)
print_edge (outfile, e, true);
}
/* If BB is non-NULL, print the end of a "(block)" directive for it
to OUTFILE, otherwise do nothing. */
static void
end_any_block (FILE *outfile, basic_block bb)
{
if (!bb)
return;
edge e;
edge_iterator ei;
FOR_EACH_EDGE (e, ei, bb->succs)
print_edge (outfile, e, false);
fprintf (outfile, " ) ;; block %i\n", bb->index);
}
/* Determine if INSN is of a kind that can have a basic block. */
static bool
can_have_basic_block_p (const rtx_insn *insn)
{
rtx_code code = GET_CODE (insn);
if (code == BARRIER)
return false;
gcc_assert (GET_RTX_FORMAT (code)[2] == 'B');
return true;
}
/* Subroutine of print_param. Write the name of ARG, if any, to OUTFILE. */
static void
print_any_param_name (FILE *outfile, tree arg)
{
if (DECL_NAME (arg))
fprintf (outfile, " \"%s\"", IDENTIFIER_POINTER (DECL_NAME (arg)));
}
/* Print a "(param)" directive for ARG to OUTFILE. */
static void
print_param (FILE *outfile, rtx_writer &w, tree arg)
{
fprintf (outfile, " (param");
print_any_param_name (outfile, arg);
fprintf (outfile, "\n");
/* Print the value of DECL_RTL (without lazy-evaluation). */
fprintf (outfile, " (DECL_RTL ");
w.print_rtx (DECL_RTL_IF_SET (arg));
w.finish_directive ();
/* Print DECL_INCOMING_RTL. */
fprintf (outfile, " (DECL_RTL_INCOMING ");
w.print_rtx (DECL_INCOMING_RTL (arg));
fprintf (outfile, ")");
w.finish_directive ();
}
/* Write FN to OUTFILE in a form suitable for parsing, with indentation
and comments to make the structure easy for a human to grok. Track
the basic blocks of insns in the chain, wrapping those that are within
blocks within "(block)" directives.
If COMPACT, then instructions are printed in a compact form:
- INSN_UIDs are omitted, except for jumps and CODE_LABELs,
- INSN_CODEs are omitted,
- register numbers are omitted for hard and virtual regs, and
non-virtual pseudos are offset relative to the first such reg, and
printed with a '%' sigil e.g. "%0" for (LAST_VIRTUAL_REGISTER + 1),
- insn names are prefixed with "c" (e.g. "cinsn", "cnote", etc)
Example output (with COMPACT==true):
(function "times_two"
(param "i"
(DECL_RTL (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
(const_int -4)) [1 i+0 S4 A32]))
(DECL_RTL_INCOMING (reg:SI di [ i ])))
(insn-chain
(cnote 1 NOTE_INSN_DELETED)
(block 2
(edge-from entry (flags "FALLTHRU"))
(cnote 4 [bb 2] NOTE_INSN_BASIC_BLOCK)
(cinsn 2 (set (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
(const_int -4)) [1 i+0 S4 A32])
(reg:SI di [ i ])) "t.c":2)
(cnote 3 NOTE_INSN_FUNCTION_BEG)
(cinsn 6 (set (reg:SI <2>)
(mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
(const_int -4)) [1 i+0 S4 A32])) "t.c":3)
(cinsn 7 (parallel [
(set (reg:SI <0> [ _2 ])
(ashift:SI (reg:SI <2>)
(const_int 1)))
(clobber (reg:CC flags))
]) "t.c":3
(expr_list:REG_EQUAL (ashift:SI (mem/c:SI (plus:DI (reg/f:DI virtual-stack-vars)
(const_int -4)) [1 i+0 S4 A32])
(const_int 1))))
(cinsn 10 (set (reg:SI <1> [ <retval> ])
(reg:SI <0> [ _2 ])) "t.c":3)
(cinsn 14 (set (reg/i:SI ax)
(reg:SI <1> [ <retval> ])) "t.c":4)
(cinsn 15 (use (reg/i:SI ax)) "t.c":4)
(edge-to exit (flags "FALLTHRU"))
) ;; block 2
) ;; insn-chain
(crtl
(return_rtx
(reg/i:SI ax)
) ;; return_rtx
) ;; crtl
) ;; function "times_two"
*/
DEBUG_FUNCTION void
print_rtx_function (FILE *outfile, function *fn, bool compact)
{
rtx_reuse_manager r;
rtx_writer w (outfile, 0, false, compact, &r);
/* Support "reuse_rtx" in the dump. */
for (rtx_insn *insn = get_insns (); insn; insn = NEXT_INSN (insn))
r.preprocess (insn);
tree fdecl = fn->decl;
const char *dname = lang_hooks.decl_printable_name (fdecl, 1);
fprintf (outfile, "(function \"%s\"\n", dname);
/* Params. */
for (tree arg = DECL_ARGUMENTS (fdecl); arg; arg = DECL_CHAIN (arg))
print_param (outfile, w, arg);
/* The instruction chain. */
fprintf (outfile, " (insn-chain\n");
basic_block curr_bb = NULL;
for (rtx_insn *insn = get_insns (); insn; insn = NEXT_INSN (insn))
{
basic_block insn_bb;
if (can_have_basic_block_p (insn))
insn_bb = BLOCK_FOR_INSN (insn);
else
insn_bb = NULL;
if (curr_bb != insn_bb)
{
end_any_block (outfile, curr_bb);
curr_bb = insn_bb;
begin_any_block (outfile, curr_bb);
}
w.print_rtl_single_with_indent (insn, curr_bb ? 6 : 4);
}
end_any_block (outfile, curr_bb);
fprintf (outfile, " ) ;; insn-chain\n");
/* Additional RTL state. */
fprintf (outfile, " (crtl\n");
fprintf (outfile, " (return_rtx \n");
w.print_rtl_single_with_indent (crtl->return_rtx, 6);
fprintf (outfile, " ) ;; return_rtx\n");
fprintf (outfile, " ) ;; crtl\n");
fprintf (outfile, ") ;; function \"%s\"\n", dname);
}
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