rebase

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@177571 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 355 insertions, 0 deletions

diff --git a/gcc/data-streamer.h b/gcc/data-streamer.h
new file mode 100644
index 00000000000..c2f6fa81fb5
--- /dev/null
+++ b/gcc/data-streamer.h
@@ -0,0 +1,355 @@
+/* Generic streaming support for various data types.
+
+   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/>.  */
+
+#ifndef GCC_DATA_STREAMER_H
+#define GCC_DATA_STREAMER_H
+
+#include "vec.h"
+#include "lto-streamer.h"
+
+/* Data structures used to pack values and bitflags into a vector of
+   words.  Used to stream values of a fixed number of bits in a space
+   efficient way.  */
+static unsigned const BITS_PER_BITPACK_WORD = HOST_BITS_PER_WIDE_INT;
+
+typedef unsigned HOST_WIDE_INT bitpack_word_t;
+DEF_VEC_I(bitpack_word_t);
+DEF_VEC_ALLOC_I(bitpack_word_t, heap);
+
+struct bitpack_d
+{
+  /* The position of the first unused or unconsumed bit in the word.  */
+  unsigned pos;
+
+  /* The current word we are (un)packing.  */
+  bitpack_word_t word;
+
+  /* The lto_output_stream or the lto_input_block we are streaming to/from.  */
+  void *stream;
+};
+
+
+/* String hashing.  */
+struct string_slot
+{
+  const char *s;
+  int len;
+  unsigned int slot_num;
+};
+
+
+/* Returns a hash code for P.  Adapted from libiberty's htab_hash_string
+   to support strings that may not end in '\0'.  */
+
+static inline hashval_t
+hash_string_slot_node (const void *p)
+{
+  const struct string_slot *ds = (const struct string_slot *) p;
+  hashval_t r = ds->len;
+  int i;
+
+  for (i = 0; i < ds->len; i++)
+     r = r * 67 + (unsigned)ds->s[i] - 113;
+  return r;
+}
+
+/* Returns nonzero if P1 and P2 are equal.  */
+
+static inline int
+eq_string_slot_node (const void *p1, const void *p2)
+{
+  const struct string_slot *ds1 = (const struct string_slot *) p1;
+  const struct string_slot *ds2 = (const struct string_slot *) p2;
+
+  if (ds1->len == ds2->len)
+    return memcmp (ds1->s, ds2->s, ds1->len) == 0;
+
+  return 0;
+}
+
+/* Returns a new bit-packing context for bit-packing into S.  */
+static inline struct bitpack_d
+bitpack_create (struct lto_output_stream *s)
+{
+  struct bitpack_d bp;
+  bp.pos = 0;
+  bp.word = 0;
+  bp.stream = (void *)s;
+  return bp;
+}
+
+/* Pack the NBITS bit sized value VAL into the bit-packing context BP.  */
+static inline void
+bp_pack_value (struct bitpack_d *bp, bitpack_word_t val, unsigned nbits)
+{
+  bitpack_word_t word = bp->word;
+  int pos = bp->pos;
+
+  /* Verify that VAL fits in the NBITS.  */
+  gcc_checking_assert (nbits == BITS_PER_BITPACK_WORD
+		       || !(val & ~(((bitpack_word_t)1<<nbits)-1)));
+
+  /* If val does not fit into the current bitpack word switch to the
+     next one.  */
+  if (pos + nbits > BITS_PER_BITPACK_WORD)
+    {
+      lto_output_uleb128_stream ((struct lto_output_stream *) bp->stream, word);
+      word = val;
+      pos = nbits;
+    }
+  else
+    {
+      word |= val << pos;
+      pos += nbits;
+    }
+  bp->word = word;
+  bp->pos = pos;
+}
+
+/* Finishes bit-packing of BP.  */
+static inline void
+lto_output_bitpack (struct bitpack_d *bp)
+{
+  lto_output_uleb128_stream ((struct lto_output_stream *) bp->stream,
+			     bp->word);
+  bp->word = 0;
+  bp->pos = 0;
+}
+
+/* Returns a new bit-packing context for bit-unpacking from IB.  */
+static inline struct bitpack_d
+lto_input_bitpack (struct lto_input_block *ib)
+{
+  struct bitpack_d bp;
+  bp.word = lto_input_uleb128 (ib);
+  bp.pos = 0;
+  bp.stream = (void *)ib;
+  return bp;
+}
+
+/* Unpacks NBITS bits from the bit-packing context BP and returns them.  */
+static inline bitpack_word_t
+bp_unpack_value (struct bitpack_d *bp, unsigned nbits)
+{
+  bitpack_word_t mask, val;
+  int pos = bp->pos;
+
+  mask = (nbits == BITS_PER_BITPACK_WORD
+	  ? (bitpack_word_t) -1
+	  : ((bitpack_word_t) 1 << nbits) - 1);
+
+  /* If there are not continuous nbits in the current bitpack word
+     switch to the next one.  */
+  if (pos + nbits > BITS_PER_BITPACK_WORD)
+    {
+      bp->word = val = lto_input_uleb128 ((struct lto_input_block *)bp->stream);
+      bp->pos = nbits;
+      return val & mask;
+    }
+  val = bp->word;
+  val >>= pos;
+  bp->pos = pos + nbits;
+
+  return val & mask;
+}
+
+
+/* Write a character to the output block.  */
+
+static inline void
+lto_output_1_stream (struct lto_output_stream *obs, char c)
+{
+  /* No space left.  */
+  if (obs->left_in_block == 0)
+    lto_append_block (obs);
+
+  /* Write the actual character.  */
+  *obs->current_pointer = c;
+  obs->current_pointer++;
+  obs->total_size++;
+  obs->left_in_block--;
+}
+
+
+/* Read byte from the input block.  */
+
+static inline unsigned char
+lto_input_1_unsigned (struct lto_input_block *ib)
+{
+  if (ib->p >= ib->len)
+    lto_section_overrun (ib);
+  return (ib->data[ib->p++]);
+}
+
+/* Output VAL into OBS and verify it is in range MIN...MAX that is supposed
+   to be compile time constant.
+   Be host independent, limit range to 31bits.  */
+
+static inline void
+lto_output_int_in_range (struct lto_output_stream *obs,
+			 HOST_WIDE_INT min,
+			 HOST_WIDE_INT max,
+			 HOST_WIDE_INT val)
+{
+  HOST_WIDE_INT range = max - min;
+
+  gcc_checking_assert (val >= min && val <= max && range > 0
+		       && range < 0x7fffffff);
+
+  val -= min;
+  lto_output_1_stream (obs, val & 255);
+  if (range >= 0xff)
+    lto_output_1_stream (obs, (val >> 8) & 255);
+  if (range >= 0xffff)
+    lto_output_1_stream (obs, (val >> 16) & 255);
+  if (range >= 0xffffff)
+    lto_output_1_stream (obs, (val >> 24) & 255);
+}
+
+/* Input VAL into OBS and verify it is in range MIN...MAX that is supposed
+   to be compile time constant.  PURPOSE is used for error reporting.  */
+
+static inline HOST_WIDE_INT
+lto_input_int_in_range (struct lto_input_block *ib,
+			const char *purpose,
+			HOST_WIDE_INT min,
+			HOST_WIDE_INT max)
+{
+  HOST_WIDE_INT range = max - min;
+  HOST_WIDE_INT val = lto_input_1_unsigned (ib);
+
+  gcc_checking_assert (range > 0 && range < 0x7fffffff);
+
+  if (range >= 0xff)
+    val |= ((HOST_WIDE_INT)lto_input_1_unsigned (ib)) << 8;
+  if (range >= 0xffff)
+    val |= ((HOST_WIDE_INT)lto_input_1_unsigned (ib)) << 16;
+  if (range >= 0xffffff)
+    val |= ((HOST_WIDE_INT)lto_input_1_unsigned (ib)) << 24;
+  val += min;
+  if (val < min || val > max)
+    lto_value_range_error (purpose, val, min, max);
+  return val;
+}
+
+/* Output VAL into BP and verify it is in range MIN...MAX that is supposed
+   to be compile time constant.
+   Be host independent, limit range to 31bits.  */
+
+static inline void
+bp_pack_int_in_range (struct bitpack_d *bp,
+		      HOST_WIDE_INT min,
+		      HOST_WIDE_INT max,
+		      HOST_WIDE_INT val)
+{
+  HOST_WIDE_INT range = max - min;
+  int nbits = floor_log2 (range) + 1;
+
+  gcc_checking_assert (val >= min && val <= max && range > 0
+		       && range < 0x7fffffff);
+
+  val -= min;
+  bp_pack_value (bp, val, nbits);
+}
+
+/* Input VAL into BP and verify it is in range MIN...MAX that is supposed
+   to be compile time constant.  PURPOSE is used for error reporting.  */
+
+static inline HOST_WIDE_INT
+bp_unpack_int_in_range (struct bitpack_d *bp,
+		        const char *purpose,
+		        HOST_WIDE_INT min,
+		        HOST_WIDE_INT max)
+{
+  HOST_WIDE_INT range = max - min;
+  int nbits = floor_log2 (range) + 1;
+  HOST_WIDE_INT val = bp_unpack_value (bp, nbits);
+
+  gcc_checking_assert (range > 0 && range < 0x7fffffff);
+
+  if (val < min || val > max)
+    lto_value_range_error (purpose, val, min, max);
+  return val;
+}
+
+/* Output VAL of type "enum enum_name" into OBS.
+   Assume range 0...ENUM_LAST - 1.  */
+#define lto_output_enum(obs,enum_name,enum_last,val) \
+  lto_output_int_in_range ((obs), 0, (int)(enum_last) - 1, (int)(val))
+
+/* Input enum of type "enum enum_name" from IB.
+   Assume range 0...ENUM_LAST - 1.  */
+#define lto_input_enum(ib,enum_name,enum_last) \
+  (enum enum_name)lto_input_int_in_range ((ib), #enum_name, 0, \
+					  (int)(enum_last) - 1)
+
+/* Output VAL of type "enum enum_name" into BP.
+   Assume range 0...ENUM_LAST - 1.  */
+#define bp_pack_enum(bp,enum_name,enum_last,val) \
+  bp_pack_int_in_range ((bp), 0, (int)(enum_last) - 1, (int)(val))
+
+/* Input enum of type "enum enum_name" from BP.
+   Assume range 0...ENUM_LAST - 1.  */
+#define bp_unpack_enum(bp,enum_name,enum_last) \
+  (enum enum_name)bp_unpack_int_in_range ((bp), #enum_name, 0, \
+					(int)(enum_last) - 1)
+
+/* Output the start of a record with TAG to output block OB.  */
+
+static inline void
+output_record_start (struct output_block *ob, enum LTO_tags tag)
+{
+  lto_output_enum (ob->main_stream, LTO_tags, LTO_NUM_TAGS, tag);
+}
+
+/* Return the next tag in the input block IB.  */
+
+static inline enum LTO_tags
+input_record_start (struct lto_input_block *ib)
+{
+  return lto_input_enum (ib, LTO_tags, LTO_NUM_TAGS);
+}
+
+/* In data-streamer.c  */
+void bp_pack_var_len_unsigned (struct bitpack_d *, unsigned HOST_WIDE_INT);
+void bp_pack_var_len_int (struct bitpack_d *, HOST_WIDE_INT);
+unsigned HOST_WIDE_INT bp_unpack_var_len_unsigned (struct bitpack_d *);
+HOST_WIDE_INT bp_unpack_var_len_int (struct bitpack_d *);
+
+/* In data-streamer-out.c  */
+void output_zero (struct output_block *);
+void output_uleb128 (struct output_block *, unsigned HOST_WIDE_INT);
+void output_sleb128 (struct output_block *, HOST_WIDE_INT);
+void lto_output_string (struct output_block *, struct lto_output_stream *,
+			const char *, bool);
+unsigned lto_string_index (struct output_block *, const char *, unsigned int,
+			   bool);
+void lto_output_string_with_length (struct output_block *,
+				    struct lto_output_stream *,
+				    const char *, unsigned int, bool);
+const char *input_string_internal (struct data_in *, struct lto_input_block *,
+				   unsigned int *);
+
+/* In data-streamer-in.c  */
+const char *string_for_index (struct data_in *, unsigned int, unsigned int *);
+const char *lto_input_string (struct data_in *, struct lto_input_block *);
+
+#endif  /* GCC_DATA_STREAMER_H  */