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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [vec.c] - Rev 310
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/* Vector API for GNU compiler. Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc. Contributed by Nathan Sidwell <nathan@codesourcery.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/>. */ /* This file is compiled twice: once for the generator programs once for the compiler. */ #ifdef GENERATOR_FILE #include "bconfig.h" #else #include "config.h" #endif #include "system.h" #include "ggc.h" #include "vec.h" #include "coretypes.h" #include "tree.h" #include "toplev.h" struct vec_prefix { unsigned num; unsigned alloc; void *vec[1]; }; /* Calculate the new ALLOC value, making sure that RESERVE slots are free. If EXACT grow exactly, otherwise grow exponentially. */ static inline unsigned calculate_allocation (const struct vec_prefix *pfx, int reserve, bool exact) { unsigned alloc = 0; unsigned num = 0; gcc_assert (reserve >= 0); if (pfx) { alloc = pfx->alloc; num = pfx->num; } else if (!reserve) /* If there's no prefix, and we've not requested anything, then we will create a NULL vector. */ return 0; /* We must have run out of room. */ gcc_assert (alloc - num < (unsigned) reserve); if (exact) /* Exact size. */ alloc = num + reserve; else { /* Exponential growth. */ if (!alloc) alloc = 4; else if (alloc < 16) /* Double when small. */ alloc = alloc * 2; else /* Grow slower when large. */ alloc = (alloc * 3 / 2); /* If this is still too small, set it to the right size. */ if (alloc < num + reserve) alloc = num + reserve; } return alloc; } /* Ensure there are at least RESERVE free slots in VEC. If EXACT grow exactly, else grow exponentially. As a special case, if VEC is NULL and RESERVE is 0, no vector will be created. The vector's trailing array is at VEC_OFFSET offset and consists of ELT_SIZE sized elements. */ static void * vec_gc_o_reserve_1 (void *vec, int reserve, size_t vec_offset, size_t elt_size, bool exact MEM_STAT_DECL) { struct vec_prefix *pfx = vec; unsigned alloc = alloc = calculate_allocation (pfx, reserve, exact); if (!alloc) return NULL; vec = ggc_realloc_stat (vec, vec_offset + alloc * elt_size PASS_MEM_STAT); ((struct vec_prefix *)vec)->alloc = alloc; if (!pfx) ((struct vec_prefix *)vec)->num = 0; return vec; } /* Ensure there are at least RESERVE free slots in VEC, growing exponentially. If RESERVE < 0 grow exactly, else grow exponentially. As a special case, if VEC is NULL, and RESERVE is 0, no vector will be created. */ void * vec_gc_p_reserve (void *vec, int reserve MEM_STAT_DECL) { return vec_gc_o_reserve_1 (vec, reserve, offsetof (struct vec_prefix, vec), sizeof (void *), false PASS_MEM_STAT); } /* Ensure there are at least RESERVE free slots in VEC, growing exactly. If RESERVE < 0 grow exactly, else grow exponentially. As a special case, if VEC is NULL, and RESERVE is 0, no vector will be created. */ void * vec_gc_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL) { return vec_gc_o_reserve_1 (vec, reserve, offsetof (struct vec_prefix, vec), sizeof (void *), true PASS_MEM_STAT); } /* As for vec_gc_p_reserve, but for object vectors. The vector's trailing array is at VEC_OFFSET offset and consists of ELT_SIZE sized elements. */ void * vec_gc_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size MEM_STAT_DECL) { return vec_gc_o_reserve_1 (vec, reserve, vec_offset, elt_size, false PASS_MEM_STAT); } /* As for vec_gc_p_reserve_exact, but for object vectors. The vector's trailing array is at VEC_OFFSET offset and consists of ELT_SIZE sized elements. */ void * vec_gc_o_reserve_exact (void *vec, int reserve, size_t vec_offset, size_t elt_size MEM_STAT_DECL) { return vec_gc_o_reserve_1 (vec, reserve, vec_offset, elt_size, true PASS_MEM_STAT); } /* As for vec_gc_o_reserve_1, but for heap allocated vectors. */ static void * vec_heap_o_reserve_1 (void *vec, int reserve, size_t vec_offset, size_t elt_size, bool exact MEM_STAT_DECL) { struct vec_prefix *pfx = vec; unsigned alloc = calculate_allocation (pfx, reserve, exact); if (!alloc) return NULL; vec = xrealloc (vec, vec_offset + alloc * elt_size); ((struct vec_prefix *)vec)->alloc = alloc; if (!pfx) ((struct vec_prefix *)vec)->num = 0; return vec; } /* As for vec_gc_p_reserve, but for heap allocated vectors. */ void * vec_heap_p_reserve (void *vec, int reserve MEM_STAT_DECL) { return vec_heap_o_reserve_1 (vec, reserve, offsetof (struct vec_prefix, vec), sizeof (void *), false PASS_MEM_STAT); } /* As for vec_gc_p_reserve_exact, but for heap allocated vectors. */ void * vec_heap_p_reserve_exact (void *vec, int reserve MEM_STAT_DECL) { return vec_heap_o_reserve_1 (vec, reserve, offsetof (struct vec_prefix, vec), sizeof (void *), true PASS_MEM_STAT); } /* As for vec_gc_o_reserve, but for heap allocated vectors. */ void * vec_heap_o_reserve (void *vec, int reserve, size_t vec_offset, size_t elt_size MEM_STAT_DECL) { return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size, false PASS_MEM_STAT); } /* As for vec_gc_o_reserve_exact, but for heap allocated vectors. */ void * vec_heap_o_reserve_exact (void *vec, int reserve, size_t vec_offset, size_t elt_size MEM_STAT_DECL) { return vec_heap_o_reserve_1 (vec, reserve, vec_offset, elt_size, true PASS_MEM_STAT); } #if ENABLE_CHECKING /* Issue a vector domain error, and then fall over. */ void vec_assert_fail (const char *op, const char *struct_name, const char *file, unsigned int line, const char *function) { internal_error ("vector %s %s domain error, in %s at %s:%u", struct_name, op, function, trim_filename (file), line); } #endif
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