| 1 | /* Virtual array support.
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| 2 | Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
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| 3 | Contributed by Cygnus Solutions.
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| 4 |
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| 5 | This file is part of GCC.
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| 6 |
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| 7 | GCC is free software; you can redistribute it and/or modify it
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| 8 | under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2, or (at your option)
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| 10 | any later version.
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| 11 |
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| 12 | GCC is distributed in the hope that it will be useful, but WITHOUT
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| 13 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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| 14 | or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
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| 15 | License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with GCC; see the file COPYING. If not, write to the Free
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| 19 | the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
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| 20 | MA 02111-1307, USA. */
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| 21 |
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| 22 | #include "config.h"
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| 23 | #include "errors.h"
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| 24 | #include "system.h"
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| 25 | #include "rtl.h"
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| 26 | #include "tree.h"
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| 27 | #include "bitmap.h"
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| 28 | #include "varray.h"
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| 29 |
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| 30 | #define VARRAY_HDR_SIZE (sizeof (struct varray_head_tag) - sizeof (varray_data))
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| 31 |
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| 32 | /* Allocate a virtual array with NUM_ELEMENT elements, each of which is
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| 33 | ELEMENT_SIZE bytes long, named NAME. Array elements are zeroed. */
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| 34 | varray_type
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| 35 | varray_init (num_elements, element_size, name)
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| 36 | size_t num_elements;
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| 37 | size_t element_size;
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| 38 | const char *name;
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| 39 | {
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| 40 | size_t data_size = num_elements * element_size;
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| 41 | varray_type ptr = (varray_type) xcalloc (VARRAY_HDR_SIZE + data_size, 1);
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| 42 |
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| 43 | ptr->num_elements = num_elements;
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| 44 | ptr->elements_used = 0;
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| 45 | ptr->element_size = element_size;
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| 46 | ptr->name = name;
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| 47 | return ptr;
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| 48 | }
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| 49 |
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| 50 | /* Grow/shrink the virtual array VA to N elements. Zero any new elements
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| 51 | allocated. */
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| 52 | varray_type
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| 53 | varray_grow (va, n)
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| 54 | varray_type va;
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| 55 | size_t n;
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| 56 | {
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| 57 | size_t old_elements = va->num_elements;
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| 58 |
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| 59 | if (n != old_elements)
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| 60 | {
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| 61 | size_t element_size = va->element_size;
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| 62 | size_t old_data_size = old_elements * element_size;
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| 63 | size_t data_size = n * element_size;
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| 64 |
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| 65 | va = (varray_type) xrealloc ((char *) va, VARRAY_HDR_SIZE + data_size);
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| 66 | va->num_elements = n;
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| 67 | if (n > old_elements)
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| 68 | memset (&va->data.c[old_data_size], 0, data_size - old_data_size);
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| 69 | }
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| 70 |
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| 71 | return va;
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| 72 | }
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| 73 |
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| 74 | /* Check the bounds of a varray access. */
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| 75 |
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| 76 | #if defined ENABLE_CHECKING && (GCC_VERSION >= 2007)
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| 77 |
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| 78 | extern void error PARAMS ((const char *, ...)) ATTRIBUTE_PRINTF_1;
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| 79 |
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| 80 | void
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| 81 | varray_check_failed (va, n, file, line, function)
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| 82 | varray_type va;
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| 83 | size_t n;
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| 84 | const char *file;
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| 85 | int line;
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| 86 | const char *function;
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| 87 | {
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| 88 | internal_error ("virtual array %s[%lu]: element %lu out of bounds in %s, at %s:%d",
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| 89 | va->name, (unsigned long) va->num_elements, (unsigned long) n,
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| 90 | function, trim_filename (file), line);
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| 91 | }
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| 92 |
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| 93 | #endif
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