| /* Routines for saving various data types to a file stream. This deals |
| with various data types like strings, integers, enums, etc. |
| |
| Copyright (C) 2011-2019 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 "cgraph.h" |
| #include "data-streamer.h" |
| |
| |
| /* Adds a new block to output stream OBS. */ |
| |
| void |
| lto_append_block (struct lto_output_stream *obs) |
| { |
| struct lto_char_ptr_base *new_block; |
| |
| gcc_assert (obs->left_in_block == 0); |
| |
| if (obs->first_block == NULL) |
| { |
| /* This is the first time the stream has been written |
| into. */ |
| obs->block_size = 1024; |
| new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size); |
| obs->first_block = new_block; |
| } |
| else |
| { |
| struct lto_char_ptr_base *tptr; |
| /* Get a new block that is twice as big as the last block |
| and link it into the list. */ |
| obs->block_size *= 2; |
| new_block = (struct lto_char_ptr_base*) xmalloc (obs->block_size); |
| /* The first bytes of the block are reserved as a pointer to |
| the next block. Set the chain of the full block to the |
| pointer to the new block. */ |
| tptr = obs->current_block; |
| tptr->ptr = (char *) new_block; |
| } |
| |
| /* Set the place for the next char at the first position after the |
| chain to the next block. */ |
| obs->current_pointer |
| = ((char *) new_block) + sizeof (struct lto_char_ptr_base); |
| obs->current_block = new_block; |
| /* Null out the newly allocated block's pointer to the next block. */ |
| new_block->ptr = NULL; |
| obs->left_in_block = obs->block_size - sizeof (struct lto_char_ptr_base); |
| } |
| |
| |
| /* Return index used to reference STRING of LEN characters in the string table |
| in OB. The string might or might not include a trailing '\0'. |
| Then put the index onto the INDEX_STREAM. |
| When PERSISTENT is set, the string S is supposed to not change during |
| duration of the OB and thus OB can keep pointer into it. */ |
| |
| static unsigned |
| streamer_string_index (struct output_block *ob, const char *s, unsigned int len, |
| bool persistent) |
| { |
| struct string_slot **slot; |
| struct string_slot s_slot; |
| |
| s_slot.s = s; |
| s_slot.len = len; |
| s_slot.slot_num = 0; |
| |
| slot = ob->string_hash_table->find_slot (&s_slot, INSERT); |
| if (*slot == NULL) |
| { |
| struct lto_output_stream *string_stream = ob->string_stream; |
| unsigned int start = string_stream->total_size; |
| struct string_slot *new_slot = XOBNEW (&ob->obstack, struct string_slot); |
| const char *string; |
| |
| if (!persistent) |
| { |
| char *tmp; |
| string = tmp = XOBNEWVEC (&ob->obstack, char, len); |
| memcpy (tmp, s, len); |
| } |
| else |
| string = s; |
| |
| new_slot->s = string; |
| new_slot->len = len; |
| new_slot->slot_num = start; |
| *slot = new_slot; |
| streamer_write_uhwi_stream (string_stream, len); |
| streamer_write_data_stream (string_stream, string, len); |
| return start + 1; |
| } |
| else |
| { |
| struct string_slot *old_slot = *slot; |
| return old_slot->slot_num + 1; |
| } |
| } |
| |
| |
| /* Output STRING of LEN characters to the string table in OB. The |
| string might or might not include a trailing '\0'. Then put the |
| index onto the INDEX_STREAM. |
| When PERSISTENT is set, the string S is supposed to not change during |
| duration of the OB and thus OB can keep pointer into it. */ |
| |
| void |
| streamer_write_string_with_length (struct output_block *ob, |
| struct lto_output_stream *index_stream, |
| const char *s, unsigned int len, |
| bool persistent) |
| { |
| if (s) |
| streamer_write_uhwi_stream (index_stream, |
| streamer_string_index (ob, s, len, persistent)); |
| else |
| streamer_write_char_stream (index_stream, 0); |
| } |
| |
| |
| /* Output the '\0' terminated STRING to the string |
| table in OB. Then put the index onto the INDEX_STREAM. |
| When PERSISTENT is set, the string S is supposed to not change during |
| duration of the OB and thus OB can keep pointer into it. */ |
| |
| void |
| streamer_write_string (struct output_block *ob, |
| struct lto_output_stream *index_stream, |
| const char *string, bool persistent) |
| { |
| if (string) |
| streamer_write_string_with_length (ob, index_stream, string, |
| strlen (string) + 1, |
| persistent); |
| else |
| streamer_write_char_stream (index_stream, 0); |
| } |
| |
| |
| /* Output STRING of LEN characters to the string table in OB. Then |
| put the index into BP. |
| When PERSISTENT is set, the string S is supposed to not change during |
| duration of the OB and thus OB can keep pointer into it. */ |
| |
| void |
| bp_pack_string_with_length (struct output_block *ob, struct bitpack_d *bp, |
| const char *s, unsigned int len, bool persistent) |
| { |
| unsigned index = 0; |
| if (s) |
| index = streamer_string_index (ob, s, len, persistent); |
| bp_pack_var_len_unsigned (bp, index); |
| } |
| |
| |
| /* Output the '\0' terminated STRING to the string |
| table in OB. Then put the index onto the bitpack BP. |
| When PERSISTENT is set, the string S is supposed to not change during |
| duration of the OB and thus OB can keep pointer into it. */ |
| |
| void |
| bp_pack_string (struct output_block *ob, struct bitpack_d *bp, |
| const char *s, bool persistent) |
| { |
| unsigned index = 0; |
| if (s) |
| index = streamer_string_index (ob, s, strlen (s) + 1, persistent); |
| bp_pack_var_len_unsigned (bp, index); |
| } |
| |
| |
| |
| /* Write a zero to the output stream. */ |
| |
| void |
| streamer_write_zero (struct output_block *ob) |
| { |
| streamer_write_char_stream (ob->main_stream, 0); |
| } |
| |
| |
| /* Write an unsigned HOST_WIDE_INT value WORK to OB->main_stream. */ |
| |
| void |
| streamer_write_uhwi (struct output_block *ob, unsigned HOST_WIDE_INT work) |
| { |
| streamer_write_uhwi_stream (ob->main_stream, work); |
| } |
| |
| |
| /* Write a HOST_WIDE_INT value WORK to OB->main_stream. */ |
| |
| void |
| streamer_write_hwi (struct output_block *ob, HOST_WIDE_INT work) |
| { |
| streamer_write_hwi_stream (ob->main_stream, work); |
| } |
| |
| /* Write a gcov counter value WORK to OB->main_stream. */ |
| |
| void |
| streamer_write_gcov_count (struct output_block *ob, gcov_type work) |
| { |
| streamer_write_gcov_count_stream (ob->main_stream, work); |
| } |
| |
| /* Write an unsigned HOST_WIDE_INT value WORK to OBS. */ |
| |
| void |
| streamer_write_uhwi_stream (struct lto_output_stream *obs, |
| unsigned HOST_WIDE_INT work) |
| { |
| if (obs->left_in_block == 0) |
| lto_append_block (obs); |
| char *current_pointer = obs->current_pointer; |
| unsigned int left_in_block = obs->left_in_block; |
| unsigned int size = 0; |
| do |
| { |
| unsigned int byte = (work & 0x7f); |
| work >>= 7; |
| if (work != 0) |
| /* More bytes to follow. */ |
| byte |= 0x80; |
| |
| *(current_pointer++) = byte; |
| left_in_block--; |
| size++; |
| } |
| while (work != 0 && left_in_block > 0); |
| if (work != 0) |
| { |
| obs->left_in_block = 0; |
| lto_append_block (obs); |
| current_pointer = obs->current_pointer; |
| left_in_block = obs->left_in_block; |
| do |
| { |
| unsigned int byte = (work & 0x7f); |
| work >>= 7; |
| if (work != 0) |
| /* More bytes to follow. */ |
| byte |= 0x80; |
| |
| *(current_pointer++) = byte; |
| left_in_block--; |
| size++; |
| } |
| while (work != 0); |
| } |
| obs->current_pointer = current_pointer; |
| obs->left_in_block = left_in_block; |
| obs->total_size += size; |
| } |
| |
| |
| /* Write a HOST_WIDE_INT value WORK to OBS. */ |
| |
| void |
| streamer_write_hwi_stream (struct lto_output_stream *obs, HOST_WIDE_INT work) |
| { |
| if (obs->left_in_block == 0) |
| lto_append_block (obs); |
| char *current_pointer = obs->current_pointer; |
| unsigned int left_in_block = obs->left_in_block; |
| unsigned int size = 0; |
| bool more; |
| do |
| { |
| unsigned int byte = (work & 0x7f); |
| /* If the lower 7-bits are sign-extended 0 or -1 we are finished. */ |
| work >>= 6; |
| more = !(work == 0 || work == -1); |
| if (more) |
| { |
| /* More bits to follow. */ |
| work >>= 1; |
| byte |= 0x80; |
| } |
| |
| *(current_pointer++) = byte; |
| left_in_block--; |
| size++; |
| } |
| while (more && left_in_block > 0); |
| if (more) |
| { |
| obs->left_in_block = 0; |
| lto_append_block (obs); |
| current_pointer = obs->current_pointer; |
| left_in_block = obs->left_in_block; |
| do |
| { |
| unsigned int byte = (work & 0x7f); |
| work >>= 6; |
| more = !(work == 0 || work == -1); |
| if (more) |
| { |
| work >>= 1; |
| byte |= 0x80; |
| } |
| |
| *(current_pointer++) = byte; |
| left_in_block--; |
| size++; |
| } |
| while (more); |
| } |
| obs->current_pointer = current_pointer; |
| obs->left_in_block = left_in_block; |
| obs->total_size += size; |
| } |
| |
| /* Write a GCOV counter value WORK to OBS. */ |
| |
| void |
| streamer_write_gcov_count_stream (struct lto_output_stream *obs, gcov_type work) |
| { |
| gcc_assert ((HOST_WIDE_INT) work == work); |
| streamer_write_hwi_stream (obs, work); |
| } |
| |
| /* Write raw DATA of length LEN to the output block OB. */ |
| |
| void |
| streamer_write_data_stream (struct lto_output_stream *obs, const void *data, |
| size_t len) |
| { |
| while (len) |
| { |
| size_t copy; |
| |
| /* No space left. */ |
| if (obs->left_in_block == 0) |
| lto_append_block (obs); |
| |
| /* Determine how many bytes to copy in this loop. */ |
| if (len <= obs->left_in_block) |
| copy = len; |
| else |
| copy = obs->left_in_block; |
| |
| /* Copy the data and do bookkeeping. */ |
| memcpy (obs->current_pointer, data, copy); |
| obs->current_pointer += copy; |
| obs->total_size += copy; |
| obs->left_in_block -= copy; |
| data = (const char *) data + copy; |
| len -= copy; |
| } |
| } |
| |
| /* Emit the physical representation of wide_int VAL to output block OB. */ |
| |
| void |
| streamer_write_wide_int (struct output_block *ob, const wide_int &val) |
| { |
| int len = val.get_len (); |
| |
| streamer_write_uhwi (ob, val.get_precision ()); |
| streamer_write_uhwi (ob, len); |
| for (int i = 0; i < len; i++) |
| streamer_write_hwi (ob, val.elt (i)); |
| } |
| |
| /* Emit the physical representation of widest_int W to output block OB. */ |
| |
| void |
| streamer_write_widest_int (struct output_block *ob, |
| const widest_int &w) |
| { |
| int len = w.get_len (); |
| |
| streamer_write_uhwi (ob, w.get_precision ()); |
| streamer_write_uhwi (ob, len); |
| for (int i = 0; i < len; i++) |
| streamer_write_hwi (ob, w.elt (i)); |
| } |
| |