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/* Write and read the cgraph to the memory mapped representation of a

   .o file.

   Copyright 2009 Free Software Foundation, Inc.

   Contributed by Kenneth Zadeck <zadeck@naturalbridge.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 "tm.h"

#include "toplev.h"

#include "tree.h"

#include "expr.h"

#include "flags.h"

#include "params.h"

#include "input.h"

#include "varray.h"

#include "hashtab.h"

#include "langhooks.h"

#include "basic-block.h"

#include "tree-flow.h"

#include "cgraph.h"

#include "function.h"

#include "ggc.h"

#include "diagnostic.h"

#include "except.h"

#include "vec.h"

#include "timevar.h"

#include "output.h"

#include "pointer-set.h"

#include "lto-streamer.h"

#include "gcov-io.h"

/* Create a new cgraph encoder.  */

lto_cgraph_encoder_t

lto_cgraph_encoder_new (void)

{

  lto_cgraph_encoder_t encoder = XCNEW (struct lto_cgraph_encoder_d);

  encoder->map = pointer_map_create ();

  encoder->nodes = NULL;

  return encoder;

}

/* Delete ENCODER and its components.  */

void

lto_cgraph_encoder_delete (lto_cgraph_encoder_t encoder)

{

   VEC_free (cgraph_node_ptr, heap, encoder->nodes);

   pointer_map_destroy (encoder->map);

   free (encoder);

}

/* Return the existing reference number of NODE in the cgraph encoder in

   output block OB.  Assign a new reference if this is the first time

   NODE is encoded.  */

int

lto_cgraph_encoder_encode (lto_cgraph_encoder_t encoder,

                           struct cgraph_node *node)

{

  int ref;

  void **slot;

  slot = pointer_map_contains (encoder->map, node);

  if (!slot)

    {

      ref = VEC_length (cgraph_node_ptr, encoder->nodes);

      slot = pointer_map_insert (encoder->map, node);

      *slot = (void *) (intptr_t) ref;

      VEC_safe_push (cgraph_node_ptr, heap, encoder->nodes, node);

    }

  else

    ref = (int) (intptr_t) *slot;

  return ref;

}

/* Look up NODE in encoder.  Return NODE's reference if it has been encoded

   or LCC_NOT_FOUND if it is not there.  */

int

lto_cgraph_encoder_lookup (lto_cgraph_encoder_t encoder,

                           struct cgraph_node *node)

{

  void **slot = pointer_map_contains (encoder->map, node);

  return (slot ? (int) (intptr_t) *slot : LCC_NOT_FOUND);

}

/* Return the cgraph node corresponding to REF using ENCODER.  */

struct cgraph_node *

lto_cgraph_encoder_deref (lto_cgraph_encoder_t encoder, int ref)

{

  if (ref == LCC_NOT_FOUND)

    return NULL;

  return VEC_index (cgraph_node_ptr, encoder->nodes, ref);

}

/* Return number of encoded nodes in ENCODER.  */

static int

lto_cgraph_encoder_size (lto_cgraph_encoder_t encoder)

{

  return VEC_length (cgraph_node_ptr, encoder->nodes);

}

/* Output the cgraph EDGE to OB using ENCODER.  */

static void

lto_output_edge (struct lto_simple_output_block *ob, struct cgraph_edge *edge,

                 lto_cgraph_encoder_t encoder)

{

  unsigned int uid;

  intptr_t ref;

  struct bitpack_d *bp;

  lto_output_uleb128_stream (ob->main_stream, LTO_cgraph_edge);

  ref = lto_cgraph_encoder_lookup (encoder, edge->caller);

  gcc_assert (ref != LCC_NOT_FOUND);

  lto_output_sleb128_stream (ob->main_stream, ref);

  ref = lto_cgraph_encoder_lookup (encoder, edge->callee);

  gcc_assert (ref != LCC_NOT_FOUND);

  lto_output_sleb128_stream (ob->main_stream, ref);

  lto_output_sleb128_stream (ob->main_stream, edge->count);

  bp = bitpack_create ();

  uid = flag_wpa ? edge->lto_stmt_uid : gimple_uid (edge->call_stmt);

  bp_pack_value (bp, uid, HOST_BITS_PER_INT);

  bp_pack_value (bp, edge->inline_failed, HOST_BITS_PER_INT);

  bp_pack_value (bp, edge->frequency, HOST_BITS_PER_INT);

  bp_pack_value (bp, edge->loop_nest, 30);

  bp_pack_value (bp, edge->indirect_call, 1);

  bp_pack_value (bp, edge->call_stmt_cannot_inline_p, 1);

  bp_pack_value (bp, edge->can_throw_external, 1);

  lto_output_bitpack (ob->main_stream, bp);

  bitpack_delete (bp);

}

/* Output the cgraph NODE to OB.  ENCODER is used to find the

   reference number of NODE->inlined_to.  SET is the set of nodes we

   are writing to the current file.  If NODE is not in SET, then NODE

   is a boundary of a cgraph_node_set and we pretend NODE just has a

   decl and no callees.  WRITTEN_DECLS is the set of FUNCTION_DECLs

   that have had their callgraph node written so far.  This is used to

   determine if NODE is a clone of a previously written node.  */

static void

lto_output_node (struct lto_simple_output_block *ob, struct cgraph_node *node,

                 lto_cgraph_encoder_t encoder, cgraph_node_set set,

                 bitmap written_decls)

{

  unsigned int tag;

  struct bitpack_d *bp;

  unsigned local, externally_visible, inlinable, analyzed;

  bool boundary_p, wrote_decl_p;

  intptr_t ref;

  boundary_p = !cgraph_node_in_set_p (node, set);

  wrote_decl_p = bitmap_bit_p (written_decls, DECL_UID (node->decl));

  switch (cgraph_function_body_availability (node))

    {

    case AVAIL_NOT_AVAILABLE:

      tag = LTO_cgraph_unavail_node;

      break;

    case AVAIL_AVAILABLE:

    case AVAIL_LOCAL:

      tag = LTO_cgraph_avail_node;

      break;

    case AVAIL_OVERWRITABLE:

      tag = LTO_cgraph_overwritable_node;

      break;

    default:

      gcc_unreachable ();

    }

  if (boundary_p)

    tag = LTO_cgraph_unavail_node;

  lto_output_uleb128_stream (ob->main_stream, tag);

  local = node->local.local;

  externally_visible = node->local.externally_visible;

  inlinable = node->local.inlinable;

  analyzed = node->analyzed;

  /* In WPA mode, we only output part of the call-graph.  Also, we

     fake cgraph node attributes.  There are two cases that we care.

     Boundary nodes: There are nodes that are not part of SET but are

     called from within SET.  We artificially make them look like

     externally visible nodes with no function body.

     Cherry-picked nodes:  These are nodes we pulled from other

     translation units into SET during IPA-inlining.  We make them as

     local static nodes to prevent clashes with other local statics.  */

  if (boundary_p)

    {

      /* Inline clones can not be part of boundary.  */

      gcc_assert (!node->global.inlined_to);

      local = 0;

      externally_visible = 1;

      inlinable = 0;

      analyzed = 0;

    }

  else if (lto_forced_extern_inline_p (node->decl))

    {

      local = 1;

      externally_visible = 0;

      inlinable = 1;

    }

  lto_output_uleb128_stream (ob->main_stream, wrote_decl_p);

  if (!wrote_decl_p)

    bitmap_set_bit (written_decls, DECL_UID (node->decl));

  lto_output_fn_decl_index (ob->decl_state, ob->main_stream, node->decl);

  lto_output_sleb128_stream (ob->main_stream, node->count);

  bp = bitpack_create ();

  bp_pack_value (bp, local, 1);

  bp_pack_value (bp, externally_visible, 1);

  bp_pack_value (bp, node->local.finalized, 1);

  bp_pack_value (bp, inlinable, 1);

  bp_pack_value (bp, node->local.disregard_inline_limits, 1);

  bp_pack_value (bp, node->local.redefined_extern_inline, 1);

  bp_pack_value (bp, node->local.for_functions_valid, 1);

  bp_pack_value (bp, node->local.vtable_method, 1);

  bp_pack_value (bp, node->needed, 1);

  bp_pack_value (bp, node->address_taken, 1);

  bp_pack_value (bp, node->abstract_and_needed, 1);

  bp_pack_value (bp, node->reachable, 1);

  bp_pack_value (bp, node->lowered, 1);

  bp_pack_value (bp, analyzed, 1);

  bp_pack_value (bp, node->process, 1);

  bp_pack_value (bp, node->alias, 1);

  bp_pack_value (bp, node->finalized_by_frontend, 1);

  lto_output_bitpack (ob->main_stream, bp);

  bitpack_delete (bp);

  if (tag != LTO_cgraph_unavail_node)

    {

      lto_output_sleb128_stream (ob->main_stream,

                                 node->local.inline_summary.estimated_self_stack_size);

      lto_output_sleb128_stream (ob->main_stream,

                                 node->local.inline_summary.self_size);

      lto_output_sleb128_stream (ob->main_stream,

                                 node->local.inline_summary.size_inlining_benefit);

      lto_output_sleb128_stream (ob->main_stream,

                                 node->local.inline_summary.self_time);

      lto_output_sleb128_stream (ob->main_stream,

                                 node->local.inline_summary.time_inlining_benefit);

    }

  /* FIXME lto: Outputting global info is not neccesary until after

     inliner was run.  Global structure holds results of propagation

     done by inliner.  */

  lto_output_sleb128_stream (ob->main_stream,

                             node->global.estimated_stack_size);

  lto_output_sleb128_stream (ob->main_stream,

                             node->global.stack_frame_offset);

  if (node->global.inlined_to && !boundary_p)

    {

      ref = lto_cgraph_encoder_lookup (encoder, node->global.inlined_to);

      gcc_assert (ref != LCC_NOT_FOUND);

    }

  else

    ref = LCC_NOT_FOUND;

  lto_output_sleb128_stream (ob->main_stream, ref);

  lto_output_sleb128_stream (ob->main_stream, node->global.time);

  lto_output_sleb128_stream (ob->main_stream, node->global.size);

  lto_output_sleb128_stream (ob->main_stream,

                             node->global.estimated_growth);

  lto_output_uleb128_stream (ob->main_stream, node->global.inlined);

  if (node->same_comdat_group)

    {

      ref = lto_cgraph_encoder_lookup (encoder, node->same_comdat_group);

      gcc_assert (ref != LCC_NOT_FOUND);

    }

  else

    ref = LCC_NOT_FOUND;

  lto_output_sleb128_stream (ob->main_stream, ref);

  if (node->same_body)

    {

      struct cgraph_node *alias;

      unsigned long alias_count = 1;

      for (alias = node->same_body; alias->next; alias = alias->next)

        alias_count++;

      lto_output_uleb128_stream (ob->main_stream, alias_count);

      do

        {

          lto_output_fn_decl_index (ob->decl_state, ob->main_stream,

                                    alias->decl);

          if (alias->thunk.thunk_p)

            {

              lto_output_uleb128_stream

                 (ob->main_stream,

                  1 + (alias->thunk.this_adjusting != 0) * 2

                  + (alias->thunk.virtual_offset_p != 0) * 4);

              lto_output_uleb128_stream (ob->main_stream,

                                         alias->thunk.fixed_offset);

              lto_output_uleb128_stream (ob->main_stream,

                                         alias->thunk.virtual_value);

              lto_output_fn_decl_index (ob->decl_state, ob->main_stream,

                                        alias->thunk.alias);

            }

          else

            {

              lto_output_uleb128_stream (ob->main_stream, 0);

              lto_output_fn_decl_index (ob->decl_state, ob->main_stream,

                                        alias->thunk.alias);

            }

          alias = alias->previous;

        }

      while (alias);

    }

  else

    lto_output_uleb128_stream (ob->main_stream, 0);

}

/* Stream out profile_summary to OB.  */

static void

output_profile_summary (struct lto_simple_output_block *ob)

{

  if (profile_info)

    {

      /* We do not output num, it is not terribly useful.  */

      gcc_assert (profile_info->runs);

      lto_output_uleb128_stream (ob->main_stream, profile_info->runs);

      lto_output_sleb128_stream (ob->main_stream, profile_info->sum_all);

      lto_output_sleb128_stream (ob->main_stream, profile_info->run_max);

      lto_output_sleb128_stream (ob->main_stream, profile_info->sum_max);

    }

  else

    lto_output_uleb128_stream (ob->main_stream, 0);

}

/* Output the part of the cgraph in SET.  */

void

output_cgraph (cgraph_node_set set)

{

  struct cgraph_node *node;

  struct lto_simple_output_block *ob;

  cgraph_node_set_iterator csi;

  struct cgraph_edge *edge;

  int i, n_nodes;

  bitmap written_decls;

  lto_cgraph_encoder_t encoder;

  struct cgraph_asm_node *can;

  ob = lto_create_simple_output_block (LTO_section_cgraph);

  output_profile_summary (ob);

  /* An encoder for cgraph nodes should have been created by

     ipa_write_summaries_1.  */

  gcc_assert (ob->decl_state->cgraph_node_encoder);

  encoder = ob->decl_state->cgraph_node_encoder;

  /* The FUNCTION_DECLs for which we have written a node.  The first

     node found is written as the "original" node, the remaining nodes

     are considered its clones.  */

  written_decls = lto_bitmap_alloc ();

  /* Go over all the nodes in SET and assign references.  */

  for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi))

    {

      node = csi_node (csi);

      lto_cgraph_encoder_encode (encoder, node);

    }

  /* Go over all the nodes again to include callees that are not in

     SET.  */

  for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi))

    {

      node = csi_node (csi);

      for (edge = node->callees; edge; edge = edge->next_callee)

        {

          struct cgraph_node *callee = edge->callee;

          if (!cgraph_node_in_set_p (callee, set))

            {

              /* We should have moved all the inlines.  */

              gcc_assert (!callee->global.inlined_to);

              lto_cgraph_encoder_encode (encoder, callee);

              /* Also with each included function include all other functions

                 in the same comdat group.  */

              if (callee->same_comdat_group)

                {

                  struct cgraph_node *next;

                  for (next = callee->same_comdat_group;

                       next != callee;

                       next = next->same_comdat_group)

                    if (!cgraph_node_in_set_p (next, set))

                      lto_cgraph_encoder_encode (encoder, next);

                }

            }

        }

      /* Also with each included function include all other functions

         in the same comdat group.  */

      if (node->same_comdat_group)

        {

          struct cgraph_node *next;

          for (next = node->same_comdat_group;

               next != node;

               next = next->same_comdat_group)

            if (!cgraph_node_in_set_p (next, set))

              lto_cgraph_encoder_encode (encoder, next);

        }

    }

  /* Write out the nodes.  */

  n_nodes = lto_cgraph_encoder_size (encoder);

  for (i = 0; i < n_nodes; i++)

    {

      node = lto_cgraph_encoder_deref (encoder, i);

      lto_output_node (ob, node, encoder, set, written_decls);

    }

  lto_bitmap_free (written_decls);

  /* Go over the nodes in SET again to write edges.  */

  for (csi = csi_start (set); !csi_end_p (csi); csi_next (&csi))

    {

      node = csi_node (csi);

      if (node->callees)

        {

          /* Output edges in backward direction, so the reconstructed callgraph

             match and it is easy to associate call sites in the IPA pass summaries.  */

          edge = node->callees;

          while (edge->next_callee)

            edge = edge->next_callee;

          for (; edge; edge = edge->prev_callee)

            lto_output_edge (ob, edge, encoder);

        }

    }

  lto_output_uleb128_stream (ob->main_stream, 0);

  /* Emit toplevel asms.  */

  for (can = cgraph_asm_nodes; can; can = can->next)

    {

      int len = TREE_STRING_LENGTH (can->asm_str);

      lto_output_uleb128_stream (ob->main_stream, len);

      for (i = 0; i < len; ++i)

        lto_output_1_stream (ob->main_stream,

                             TREE_STRING_POINTER (can->asm_str)[i]);

    }

  lto_output_uleb128_stream (ob->main_stream, 0);

  lto_destroy_simple_output_block (ob);

}

/* Overwrite the information in NODE based on FILE_DATA, TAG, FLAGS,

   STACK_SIZE, SELF_TIME and SELF_SIZE.  This is called either to initialize

   NODE or to replace the values in it, for instance because the first

   time we saw it, the function body was not available but now it

   is.  BP is a bitpack with all the bitflags for NODE read from the

   stream.  */

static void

input_overwrite_node (struct lto_file_decl_data *file_data,

                      struct cgraph_node *node,

                      enum LTO_cgraph_tags tag,

                      struct bitpack_d *bp,

                      unsigned int stack_size,

                      unsigned int self_time,

                      unsigned int time_inlining_benefit,

                      unsigned int self_size,

                      unsigned int size_inlining_benefit)

{

  node->aux = (void *) tag;

  node->local.inline_summary.estimated_self_stack_size = stack_size;

  node->local.inline_summary.self_time = self_time;

  node->local.inline_summary.time_inlining_benefit = time_inlining_benefit;

  node->local.inline_summary.self_size = self_size;

  node->local.inline_summary.size_inlining_benefit = size_inlining_benefit;

  node->global.time = self_time;

  node->global.size = self_size;

  node->local.lto_file_data = file_data;

  node->local.local = bp_unpack_value (bp, 1);

  node->local.externally_visible = bp_unpack_value (bp, 1);

  node->local.finalized = bp_unpack_value (bp, 1);

  node->local.inlinable = bp_unpack_value (bp, 1);

  node->local.disregard_inline_limits = bp_unpack_value (bp, 1);

  node->local.redefined_extern_inline = bp_unpack_value (bp, 1);

  node->local.for_functions_valid = bp_unpack_value (bp, 1);

  node->local.vtable_method = bp_unpack_value (bp, 1);

  node->needed = bp_unpack_value (bp, 1);

  node->address_taken = bp_unpack_value (bp, 1);

  node->abstract_and_needed = bp_unpack_value (bp, 1);

  node->reachable = bp_unpack_value (bp, 1);

  node->lowered = bp_unpack_value (bp, 1);

  node->analyzed = bp_unpack_value (bp, 1);

  node->process = bp_unpack_value (bp, 1);

  node->alias = bp_unpack_value (bp, 1);

  node->finalized_by_frontend = bp_unpack_value (bp, 1);

}

/* Read a node from input_block IB.  TAG is the node's tag just read.

   Return the node read or overwriten.  */

static struct cgraph_node *

input_node (struct lto_file_decl_data *file_data,

            struct lto_input_block *ib,

            enum LTO_cgraph_tags tag)

{

  tree fn_decl;

  struct cgraph_node *node;

  struct bitpack_d *bp;

  int stack_size = 0;

  unsigned decl_index;

  bool clone_p;

  int estimated_stack_size = 0;

  int stack_frame_offset = 0;

  int ref = LCC_NOT_FOUND, ref2 = LCC_NOT_FOUND;

  int estimated_growth = 0;

  int time = 0;

  int size = 0;

  int self_time = 0;

  int self_size = 0;

  int time_inlining_benefit = 0;

  int size_inlining_benefit = 0;

  unsigned long same_body_count = 0;

  bool inlined = false;

  clone_p = (lto_input_uleb128 (ib) != 0);

  decl_index = lto_input_uleb128 (ib);

  fn_decl = lto_file_decl_data_get_fn_decl (file_data, decl_index);

  if (clone_p)

    node = cgraph_clone_node (cgraph_node (fn_decl), 0,

                              CGRAPH_FREQ_BASE, 0, false, NULL);

  else

    node = cgraph_node (fn_decl);

  node->count = lto_input_sleb128 (ib);

  bp = lto_input_bitpack (ib);

  if (tag != LTO_cgraph_unavail_node)

    {

      stack_size = lto_input_sleb128 (ib);

      self_size = lto_input_sleb128 (ib);

      size_inlining_benefit = lto_input_sleb128 (ib);

      self_time = lto_input_sleb128 (ib);

      time_inlining_benefit = lto_input_sleb128 (ib);

    }

  estimated_stack_size = lto_input_sleb128 (ib);

  stack_frame_offset = lto_input_sleb128 (ib);

  ref = lto_input_sleb128 (ib);

  time = lto_input_sleb128 (ib);

  size = lto_input_sleb128 (ib);

  estimated_growth = lto_input_sleb128 (ib);

  inlined = lto_input_uleb128 (ib);

  ref2 = lto_input_sleb128 (ib);

  same_body_count = lto_input_uleb128 (ib);

  /* Make sure that we have not read this node before.  Nodes that

     have already been read will have their tag stored in the 'aux'

     field.  Since built-in functions can be referenced in multiple

     functions, they are expected to be read more than once.  */

  if (node->aux && !DECL_IS_BUILTIN (node->decl))

    internal_error ("bytecode stream: found multiple instances of cgraph "

                    "node %d", node->uid);

  input_overwrite_node (file_data, node, tag, bp, stack_size, self_time,

                        time_inlining_benefit, self_size,

                        size_inlining_benefit);

  bitpack_delete (bp);

  node->global.estimated_stack_size = estimated_stack_size;

  node->global.stack_frame_offset = stack_frame_offset;

  node->global.time = time;

  node->global.size = size;

  /* Store a reference for now, and fix up later to be a pointer.  */

  node->global.inlined_to = (cgraph_node_ptr) (intptr_t) ref;

  node->global.estimated_growth = estimated_growth;

  node->global.inlined = inlined;

  /* Store a reference for now, and fix up later to be a pointer.  */

  node->same_comdat_group = (cgraph_node_ptr) (intptr_t) ref2;

  while (same_body_count-- > 0)

    {

      tree alias_decl;

      int type;

      decl_index = lto_input_uleb128 (ib);

      alias_decl = lto_file_decl_data_get_fn_decl (file_data, decl_index);

      type = lto_input_uleb128 (ib);

      if (!type)

        {

          tree real_alias;

          decl_index = lto_input_uleb128 (ib);

          real_alias = lto_file_decl_data_get_fn_decl (file_data, decl_index);

          cgraph_same_body_alias (alias_decl, real_alias);

        }

      else

        {

          HOST_WIDE_INT fixed_offset = lto_input_uleb128 (ib);

          HOST_WIDE_INT virtual_value = lto_input_uleb128 (ib);

          tree real_alias;

          decl_index = lto_input_uleb128 (ib);

          real_alias = lto_file_decl_data_get_fn_decl (file_data, decl_index);

          cgraph_add_thunk (alias_decl, fn_decl, type & 2, fixed_offset,

                            virtual_value,

                            (type & 4) ? size_int (virtual_value) : NULL_TREE,

                            real_alias);

        }

    }

  return node;

}

/* Read an edge from IB.  NODES points to a vector of previously read

   nodes for decoding caller and callee of the edge to be read.  */

static void

input_edge (struct lto_input_block *ib, VEC(cgraph_node_ptr, heap) *nodes)

{

  struct cgraph_node *caller, *callee;

  struct cgraph_edge *edge;

  unsigned int stmt_id;

  gcov_type count;

  int freq;

  unsigned int nest;

  cgraph_inline_failed_t inline_failed;

  struct bitpack_d *bp;