pike.git/src/rbtree.c:4a705a303b622f7e3653697dfd3bbc611b3319fd

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2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 /* An implementation of a threaded red/black balanced binary tree. * * Created 2001-04-27 by Martin Stjernholm * * $Id: rbtree.c,v 1.5 2001/05/01 23:53:19 mast Exp $ */ #include "global.h" #include "constants.h" #include "builtin_functions.h" #include "interpret.h" #include "mapping.h" #include "pike_error.h" #include "svalue.h" #include "rbtree.h" #include "block_alloc.h" /* #define TEST_RBTREE */ #if defined (PIKE_DEBUG) || defined (TEST_RBTREE) typedef void dump_data_fn (struct rb_node_hdr *node); static void debug_dump_ind_data (struct rb_node_ind *node); static void debug_dump_rb_tree (struct rb_node_hdr *tree, dump_data_fn *dump_data); DECLSPEC(noreturn) static void debug_rb_fatal (struct rb_node_hdr *tree, const char *fmt, ...) ATTRIBUTE((noreturn, format (printf, 2, 3))); DECLSPEC(noreturn) static void debug_rb_ind_fatal (struct rb_node_ind *tree, const char *fmt, ...) ATTRIBUTE((noreturn, format (printf, 2, 3))); DECLSPEC(noreturn) static void debug_rb_indval_fatal (struct rb_node_indval *tree, const char *fmt, ...) ATTRIBUTE((noreturn, format (printf, 2, 3))); #define rb_fatal (fprintf (stderr, "%s:%d: Fatal in rbtree: ", \ __FILE__, __LINE__), debug_rb_fatal) #define rb_ind_fatal (fprintf (stderr, "%s:%d: Fatal in ind rbtree: ", \ __FILE__, __LINE__), debug_rb_ind_fatal) #define rb_indval_fatal (fprintf (stderr, "%s:%d: Fatal in indval rbtree: ", \ __FILE__, __LINE__), debug_rb_indval_fatal) #endif #define HDR(node) ((struct rb_node_hdr *) (node)) /* The default compare function for ind and indval. */ PMOD_EXPORT int rb_ind_default_cmp (struct svalue *key, union rb_node *node) { struct svalue tmp; return set_svalue_cmpfun (key, use_rb_node_ind (&(node->i), tmp)); } struct svalue_cmp_data { struct svalue *key, *cmp_less; }; static int svalue_cmp_eq (struct svalue_cmp_data *data, union rb_node *node) { int cmp_res; struct svalue tmp; push_svalue (data->key); push_svalue (use_rb_node_ind (&(node->i), tmp)); apply_svalue (data->cmp_less, 2); if (IS_ZERO (sp - 1)) cmp_res = !is_eq (data->key, &tmp); else cmp_res = -1; pop_stack(); return cmp_res; } /* Considers equal as greater. */ static int svalue_cmp_ge (struct svalue_cmp_data *data, union rb_node *node) { int cmp_res; struct svalue tmp; push_svalue (data->key); push_svalue (use_rb_node_ind (&(node->i), tmp)); apply_svalue (data->cmp_less, 2); cmp_res = IS_ZERO (sp - 1) ? 1 : -1; pop_stack(); return cmp_res; } /* Considers equal as less. */ static int svalue_cmp_le (struct svalue_cmp_data *data, union rb_node *node) { int cmp_res; struct svalue tmp; push_svalue (use_rb_node_ind (&(node->i), tmp)); push_svalue (data->key); apply_svalue (data->cmp_less, 2); cmp_res = IS_ZERO (sp - 1) ? -1 : 1; pop_stack(); return cmp_res; } /* Functions for handling nodes with index only. */ BLOCK_ALLOC (rb_node_ind, 1024) PMOD_EXPORT struct rb_node_ind *rb_ind_insert (struct rb_node_ind **tree, struct svalue *ind, struct svalue *cmp_less) { struct rb_node_ind *node; struct svalue tmp; if (cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = ind; LOW_RB_INSERT ((struct rb_node_hdr **) tree, HDR (node), { /* Compare. */ cmp_res = svalue_cmp_eq (&data, (union rb_node *) node); }, { /* Insert. */ node = alloc_rb_node_ind(); assign_svalue_no_free (&node->ind, ind); DO_IF_DEBUG (node->ind.type |= RB_FLAG_MARKER); }, { /* Replace. */ node = 0; }); } else { LOW_RB_INSERT ((struct rb_node_hdr **) tree, HDR (node), { /* Compare. */ cmp_res = set_svalue_cmpfun (ind, use_rb_node_ind (node, tmp)); }, { /* Insert. */ node = alloc_rb_node_ind(); assign_svalue_no_free (&node->ind, ind); DO_IF_DEBUG (node->ind.type |= RB_FLAG_MARKER); }, { /* Replace. */ node = 0; }); } return node; } PMOD_EXPORT struct rb_node_ind *rb_ind_add (struct rb_node_ind **tree, struct svalue *ind, struct svalue *cmp_less) { struct rb_node_ind *new = alloc_rb_node_ind(); assign_svalue_no_free (&new->ind, ind); #ifdef PIKE_DEBUG new->ind.type |= RB_FLAG_MARKER; #endif if (cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = ind; low_rb_add ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) svalue_cmp_eq, &data, HDR (new)); } else low_rb_add ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) rb_ind_default_cmp, ind, HDR (new)); return new; } PMOD_EXPORT int rb_ind_delete (struct rb_node_ind **tree, struct svalue *ind, struct svalue *cmp_less) { struct rb_node_ind *old; if (cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = ind; HDR (old) = low_rb_delete ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) svalue_cmp_eq, &data, sizeof (struct rb_node_ind)); } else HDR (old) = low_rb_delete ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) rb_ind_default_cmp, ind, sizeof (struct rb_node_ind)); if (old) { struct svalue tmp; free_svalue (use_rb_node_ind (old, tmp)); really_free_rb_node_ind (old); return 1; } return 0; } static struct rb_node_ind *copy_ind_node (struct rb_node_ind *node) { struct rb_node_ind *new = alloc_rb_node_ind(); struct svalue tmp; assign_svalue_no_free (&new->ind, use_rb_node_ind (node, tmp)); DO_IF_DEBUG (new->ind.type |= RB_FLAG_MARKER); return new; } PMOD_EXPORT struct rb_node_ind *rb_ind_copy (struct rb_node_ind *tree) { return (struct rb_node_ind *) low_rb_copy (HDR (tree), (low_rb_copy_fn *) copy_ind_node); } PMOD_EXPORT void rb_ind_free (struct rb_node_ind *tree) { RBSTACK_INIT (rbstack); LOW_RB_TRAVERSE (1, rbstack, HDR (tree), ;, ;, ;, ;, ;, ;, { /* Pop. */ tree->ind.type &= ~RB_IND_FLAG_MASK; free_svalue (&tree->ind); really_free_rb_node_ind (tree); }); } /* Functions for handling nodes with index and value. */ BLOCK_ALLOC (rb_node_indval, 1024) PMOD_EXPORT struct rb_node_indval *rb_indval_insert (struct rb_node_indval **tree, struct svalue *ind, struct svalue *val, struct svalue *cmp_less) { struct rb_node_indval *node; struct svalue tmp; if (cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = ind; LOW_RB_INSERT ((struct rb_node_hdr **) tree, HDR (node), { /* Compare. */ cmp_res = svalue_cmp_eq (&data, (union rb_node *) node); }, { /* Insert. */ node = alloc_rb_node_indval(); assign_svalue_no_free (&node->ind, ind); assign_svalue_no_free (&node->val, val); DO_IF_DEBUG (node->ind.type |= RB_FLAG_MARKER); }, { /* Replace. */ node = 0; }); } else { LOW_RB_INSERT ((struct rb_node_hdr **) tree, HDR (node), { /* Compare. */ cmp_res = set_svalue_cmpfun (ind, use_rb_node_ind (node, tmp)); }, { /* Insert. */ node = alloc_rb_node_indval(); assign_svalue_no_free (&node->ind, ind); assign_svalue_no_free (&node->val, val); DO_IF_DEBUG (node->ind.type |= RB_FLAG_MARKER); }, { /* Replace. */ node = 0; }); } return node; } PMOD_EXPORT struct rb_node_indval *rb_indval_add (struct rb_node_indval **tree, struct svalue *ind, struct svalue *val, struct svalue *cmp_less) { struct rb_node_indval *new = alloc_rb_node_indval(); assign_svalue_no_free (&new->ind, ind); assign_svalue_no_free (&new->val, val); #ifdef PIKE_DEBUG new->ind.type |= RB_FLAG_MARKER; #endif if (cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = ind; low_rb_add ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) svalue_cmp_eq, &data, HDR (new)); } else low_rb_add ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) rb_ind_default_cmp, ind, HDR (new)); return new; } PMOD_EXPORT struct rb_node_indval *rb_indval_add_after (struct rb_node_indval **tree, struct rb_node_indval *node, struct svalue *ind, struct svalue *val, struct svalue *cmp_less) { struct rb_node_indval *new = alloc_rb_node_indval(); assign_svalue_no_free (&new->ind, ind); assign_svalue_no_free (&new->val, val); #ifdef PIKE_DEBUG new->ind.type |= RB_FLAG_MARKER; if (*tree) { /* Check that it won't break the order. */ struct rb_node_indval *tmpnode; struct svalue tmp; int cmp1, cmp2; #define DO_CMP(a, b, cmp) \ do { \ if (cmp_less) { \ push_svalue (a); \ push_svalue (b); \ apply_svalue (cmp_less, 2); \ if (IS_ZERO (sp - 1)) \ cmp = !is_eq (a, b); \ else \ cmp = -1; \ pop_stack(); \ } \ else cmp = set_svalue_cmpfun (a, b); \ } while (0) if (node) { use_rb_node_ind (node, tmp); DO_CMP (ind, &tmp, cmp1); tmpnode = rb_indval_next (node); if (tmpnode) { use_rb_node_ind (tmpnode, tmp); DO_CMP (ind, &tmp, cmp2); } else cmp2 = -1; if (cmp1 < 0 || cmp2 > 0) fatal ("Adding at this position would break the order.\n"); } else { use_rb_node_ind (rb_indval_first (*tree), tmp); DO_CMP (ind, &tmp, cmp1); if (cmp1 > 0) fatal ("Adding at beginning would break the order.\n"); } #undef DO_CMP } #endif if (cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = ind; low_rb_add_after ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) svalue_cmp_eq, &data, HDR (new), HDR (node)); } else low_rb_add_after ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) rb_ind_default_cmp, ind, HDR (new), HDR (node)); return new; } PMOD_EXPORT int rb_indval_delete (struct rb_node_indval **tree, struct svalue *ind, struct svalue *cmp_less) { struct rb_node_indval *old; if (cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = ind; HDR (old) = low_rb_delete ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) svalue_cmp_eq, &data, sizeof (struct rb_node_indval)); } else HDR (old) = low_rb_delete ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) rb_ind_default_cmp, ind, sizeof (struct rb_node_indval)); if (old) { struct svalue tmp; free_svalue (use_rb_node_ind (old, tmp)); free_svalue (&old->val); really_free_rb_node_indval (old); return 1; } return 0; } /* Returns the pointer to the node that actually was freed. */ PMOD_EXPORT struct rb_node_indval *rb_indval_delete_node (struct rb_node_indval **tree, struct rb_node_indval *node, struct svalue *cmp_less) { struct svalue tmp; struct rb_node_indval *old; use_rb_node_ind (node, tmp); if (cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = &tmp; HDR (old) = low_rb_delete_node ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) svalue_cmp_eq, &data, HDR (node), sizeof (struct rb_node_indval)); } else HDR (old) = low_rb_delete_node ((struct rb_node_hdr **) tree, (low_rb_cmp_fn *) rb_ind_default_cmp, &tmp, HDR (node), sizeof (struct rb_node_indval)); free_svalue (use_rb_node_ind (old, tmp)); free_svalue (&old->val); really_free_rb_node_indval (old); return old; } static struct rb_node_indval *copy_indval_node (struct rb_node_indval *node) { struct rb_node_indval *new = alloc_rb_node_indval(); struct svalue tmp; assign_svalue_no_free (&new->ind, use_rb_node_ind (node, tmp)); assign_svalue_no_free (&new->val, &node->val); DO_IF_DEBUG (new->ind.type |= RB_FLAG_MARKER); return new; } PMOD_EXPORT struct rb_node_indval *rb_indval_copy (struct rb_node_indval *tree) { return (struct rb_node_indval *) low_rb_copy (HDR (tree), (low_rb_copy_fn *) copy_indval_node); } PMOD_EXPORT void rb_indval_free (struct rb_node_indval *tree) { RBSTACK_INIT (rbstack); LOW_RB_TRAVERSE (1, rbstack, HDR (tree), ;, ;, ;, ;, ;, ;, { /* Pop. */ tree->ind.type &= ~RB_IND_FLAG_MASK; free_svalue (&tree->ind); free_svalue (&tree->val); really_free_rb_node_indval (tree); }); } /* Functions for handling both types of nodes. */ PMOD_EXPORT union rb_node *rb_find_eq_extcmp (union rb_node *tree, struct svalue *key, struct svalue *cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = key; return (union rb_node *) low_rb_find_eq (HDR (tree), (low_rb_cmp_fn *) svalue_cmp_eq, &data); } PMOD_EXPORT union rb_node *rb_find_lt_extcmp (union rb_node *tree, struct svalue *key, struct svalue *cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = key; return (union rb_node *) low_rb_find_lt (HDR (tree), (low_rb_cmp_fn *) svalue_cmp_le, &data); } PMOD_EXPORT union rb_node *rb_find_gt_extcmp (union rb_node *tree, struct svalue *key, struct svalue *cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = key; return (union rb_node *) low_rb_find_gt (HDR (tree), (low_rb_cmp_fn *) svalue_cmp_ge, &data); } PMOD_EXPORT union rb_node *rb_find_le_extcmp (union rb_node *tree, struct svalue *key, struct svalue *cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = key; return (union rb_node *) low_rb_find_le (HDR (tree), (low_rb_cmp_fn *) svalue_cmp_ge, &data); } PMOD_EXPORT union rb_node *rb_find_ge_extcmp (union rb_node *tree, struct svalue *key, struct svalue *cmp_less) { struct svalue_cmp_data data; data.cmp_less = cmp_less; data.key = key; return (union rb_node *) low_rb_find_ge (HDR (tree), (low_rb_cmp_fn *) svalue_cmp_le, &data); } /* Functions for handling any type of node. */ /* Each of these step functions is O(log n), but when used to loop * through a tree they still sum up to O(n) since every node is * visited at most twice. */ PMOD_EXPORT struct rb_node_hdr *rb_first (struct rb_node_hdr *tree) { if (tree) while (tree->prev) tree = tree->prev; return tree; } PMOD_EXPORT struct rb_node_hdr *rb_last (struct rb_node_hdr *tree) { if (tree) while (tree->next) tree = tree->next; return tree; } PMOD_EXPORT struct rb_node_hdr *rb_prev (struct rb_node_hdr *node) { if (node->flags & RB_THREAD_PREV) return node->prev; else { node = node->prev; while (!(node->flags & RB_THREAD_NEXT)) node = node->next; return node; } } PMOD_EXPORT struct rb_node_hdr *rb_next (struct rb_node_hdr *node) { if (node->flags & RB_THREAD_NEXT) return node->next; else { node = node->next; while (!(node->flags & RB_THREAD_PREV)) node = node->prev; return node; } } /* The low level stuff. */ PMOD_EXPORT void rbstack_push (struct rbstack_ptr *rbstack, struct rb_node_hdr *node) { struct rbstack_slice *new = ALLOC_STRUCT (rbstack_slice); new->up = rbstack->slice; new->stack[0] = node; rbstack->slice = new; rbstack->ssp = 1; } PMOD_EXPORT void rbstack_pop (struct rbstack_ptr *rbstack) { struct rbstack_slice *old = rbstack->slice; rbstack->slice = old->up; xfree (old); rbstack->ssp = STACK_SLICE_SIZE; } PMOD_EXPORT void rbstack_up (struct rbstack_ptr *rbstack) { rbstack->slice = rbstack->slice->up; rbstack->ssp = STACK_SLICE_SIZE; } PMOD_EXPORT void rbstack_free (struct rbstack_ptr *rbstack) { struct rbstack_slice *ptr = rbstack->slice; do { struct rbstack_slice *old = ptr; ptr = ptr->up; xfree (old); } while (ptr->up); rbstack->slice = ptr; rbstack->ssp = 0; } /* Sets the pointer in parent that points to child. */ #define SET_PTR_TO_CHILD(parent, child, prev_val, next_val) \ do { \ if (child == parent->prev) \ parent->prev = prev_val; \ else { \ DO_IF_DEBUG( \ if (child != parent->next) \ rb_fatal (parent, "Got invalid parent to %p " \ "(stack probably wrong).\n", child); \ ); \ parent->next = next_val; \ } \ } while (0) /* node ret * / \ / \ * / \ / \ * ret c ==> a node * / \ / \ * / \ / \ * a b b c */ static inline struct rb_node_hdr *rot_right (struct rb_node_hdr *node) { /* Note that we don't need to do anything special to keep the * pointers in a, b and c intact, even if they're thread * pointers pointing back to node and ret. */ struct rb_node_hdr *ret = node->prev; if (ret->flags & RB_THREAD_NEXT) { #ifdef PIKE_DEBUG if (ret->next != node) rb_fatal (node, "Bogus next thread pointer.\n"); #endif ret->flags &= ~RB_THREAD_NEXT; node->flags |= RB_THREAD_PREV; } else { node->prev = ret->next; ret->next = node; } return ret; } /* node ret * / \ / \ * / \ / \ * a ret ==> node c * / \ / \ * / \ / \ * b c a b */ static inline struct rb_node_hdr *rot_left (struct rb_node_hdr *node) { struct rb_node_hdr *ret = node->next; if (ret->flags & RB_THREAD_PREV) { #ifdef PIKE_DEBUG if (ret->prev != node) rb_fatal (node, "Bogus prev thread pointer.\n"); #endif ret->flags &= ~RB_THREAD_PREV; node->flags |= RB_THREAD_NEXT; } else { node->next = ret->prev; ret->prev = node; } return ret; } /* Returns the root node, which might have changed. The passed stack * is freed. */ static struct rb_node_hdr *rebalance_after_add (struct rb_node_hdr *node, struct rbstack_ptr rbstack) { struct rb_node_hdr *parent, *grandparent, *uncle, *top; RBSTACK_POP (rbstack, parent); #ifdef PIKE_DEBUG if (!parent) rb_fatal (node, "No parent on stack.\n"); #endif RBSTACK_POP (rbstack, grandparent); top = grandparent ? grandparent : parent; while (parent->flags & RB_RED) { /* Since the root always is black we know there's a grandparent. */ #ifdef PIKE_DEBUG if (!grandparent) rb_fatal (parent, "No parent for red node.\n"); #endif if (parent == grandparent->prev) { uncle = grandparent->next; if (!(grandparent->flags & RB_THREAD_NEXT) && uncle->flags & RB_RED) { /* Case 1: * grandparent(B) *grandparent(R) * / \ / \ * / \ / \ * parent(R) uncle(R) ==> parent(B) uncle(B) * / \ / \ * / \ / \ * *node(R) or *node(R) node(R) or node(R) */ parent->flags &= ~RB_RED; uncle->flags &= ~RB_RED; RBSTACK_POP (rbstack, parent); if (!parent) { /* The grandparent is root - leave it black. */ top = grandparent; break; } grandparent->flags |= RB_RED; node = grandparent; RBSTACK_POP (rbstack, grandparent); top = grandparent ? grandparent : parent; } else { if (node == parent->next) { /* Case 2: * grandparent(B) grandparent(B) * / \ / \ * / \ / \ * parent(R) uncle(B) ==> node(R) uncle(B) * \ / \ * \ / \ * *node(R) *parent(R) (B) */ node = parent; parent = grandparent->prev = rot_left (node); } /* Case 3: * grandparent(B) parent(B) * / \ / \ * / \ / \ * parent(R) uncle(B) ==> node(R) grandparent(R) * / \ / \ * / \ / \ * *node(R) (B) (B) uncle(B) * * => Done. */ rot_right (grandparent); grandparent->flags |= RB_RED; parent->flags &= ~RB_RED; RBSTACK_POP (rbstack, top); if (top) SET_PTR_TO_CHILD (top, grandparent, parent, parent); else top = parent; break; } } else { #ifdef PIKE_DEBUG if (parent != grandparent->next) rb_fatal (grandparent, "Childs parent doesn't know about it (stack probably wrong).\n"); #endif /* The mirrored version of the above. */ uncle = grandparent->prev; if (!(grandparent->flags & RB_THREAD_PREV) && uncle->flags & RB_RED) { /* Case 1 */ parent->flags &= ~RB_RED; uncle->flags &= ~RB_RED; RBSTACK_POP (rbstack, parent); if (!parent) { top = grandparent; break; } grandparent->flags |= RB_RED; node = grandparent; RBSTACK_POP (rbstack, grandparent); top = grandparent ? grandparent : parent; } else { if (node == parent->prev) { /* Case 2 */ node = parent; parent = grandparent->next = rot_right (node); } /* Case 3 */ rot_left (grandparent); grandparent->flags |= RB_RED; parent->flags &= ~RB_RED; RBSTACK_POP (rbstack, top); if (top) SET_PTR_TO_CHILD (top, grandparent, parent, parent); else top = parent; break; } } } RBSTACK_FREE_SET_ROOT (rbstack, top); #ifdef PIKE_DEBUG if (top->flags & RB_RED) rb_fatal (top, "Root node not black.\n"); #endif return top; } /* Returns the root node, which might have changed. The passed stack * is freed. node is the value of the pointer in parent that used to * point to the unlinked node. */ static struct rb_node_hdr *rebalance_after_delete (struct rb_node_hdr *node, struct rbstack_ptr rbstack) { struct rb_node_hdr *parent, *sibling, *top = node; RBSTACK_POP (rbstack, parent); if (!parent) { if (!node) return 0; node->flags &= ~RB_RED; } else do { top = parent; if (node == parent->prev) { if (!(parent->flags & RB_THREAD_PREV) && node->flags & RB_RED) { node->flags &= ~RB_RED; break; } #ifdef PIKE_DEBUG if (parent->flags & RB_THREAD_NEXT) /* Since the node in the prev subtree is the "concatenation" * of two black nodes, there must be at least two black nodes * in the next subtree too, i.e. at least one non-null * child. */ rb_fatal (parent, "Sibling in next is null; tree was unbalanced.\n"); #endif sibling = parent->next; if (sibling->flags & RB_RED) { /* Case 1: * parent(B) sibling(B) * / \ / \ * / \ / \ * *node(2B) sibling(R) ==> parent(R) (B) * / \ / \ * / \ / \ * (B) (B) *node(2B) (B) */ parent->flags |= RB_RED; sibling->flags &= ~RB_RED; rot_left (parent); RBSTACK_POP (rbstack, top); if (top) SET_PTR_TO_CHILD (top, parent, sibling, sibling); else top = sibling; RBSTACK_PUSH (rbstack, sibling); #ifdef PIKE_DEBUG if (parent->flags & RB_THREAD_NEXT) rb_fatal (parent, "Sibling in next is null; tree was unbalanced.\n"); #endif sibling = parent->next; goto prev_node_red_parent; } if (!(parent->flags & RB_RED)) { if ((sibling->flags & RB_THREAD_PREV || !(sibling->prev->flags & RB_RED)) && (sibling->flags & RB_THREAD_NEXT || !(sibling->next->flags & RB_RED))) { /* Case 2a: * parent(B) *parent(2B) * / \ / \ * / \ / \ * *node(2B) sibling(B) ==> node(B) sibling(R) * / \ / \ * / \ / \ * (B) (B) (B) (B) */ sibling->flags |= RB_RED; node = parent; RBSTACK_POP (rbstack, parent); continue; } } else { prev_node_red_parent: if ((sibling->flags & RB_THREAD_PREV || !(sibling->prev->flags & RB_RED)) && (sibling->flags & RB_THREAD_NEXT || !(sibling->next->flags & RB_RED))) { /* Case 2b: * parent(R) parent(B) * / \ / \ * / \ / \ * *node(2B) sibling(B) ==> node(B) sibling(R) * / \ / \ * / \ / \ * (B) (B) (B) (B) * => Done. */ parent->flags &= ~RB_RED; sibling->flags |= RB_RED; break; } } if (sibling->flags & RB_THREAD_NEXT || !(sibling->next->flags & RB_RED)) { /* Case 3: * parent(?) parent(?) * / \ / \ * / \ / \ * *node(2B) sibling(B) *node(2B) new sibling(B) * / \ / \ * / \ ==> / \ * new sibling(R) (B) (B) sibling(R) * / \ / \ * / \ / \ * (B) (B) (B) (B) */ sibling->flags |= RB_RED; sibling = parent->next = rot_right (sibling); sibling->flags &= ~RB_RED; } /* Case 4: * parent(?) sibling(?) * / \ / \ * / \ / \ * *node(2B) sibling(B) ==> parent(B) (B) * / \ / \ * / \ / \ * (?) (R) node(B) (?) * => Done. */ rot_left (parent); RBSTACK_POP (rbstack, top); if (top) { SET_PTR_TO_CHILD (top, parent, sibling, sibling); if (parent->flags & RB_RED) { sibling->flags |= RB_RED; parent->flags &= ~RB_RED; } else sibling->flags &= ~RB_RED; } else { top = sibling; /* sibling is the new root, which should always be black. * So don't transfer the color from parent. */ sibling->flags &= ~RB_RED; parent->flags &= ~RB_RED; } sibling->next->flags &= ~RB_RED; break; } else { #ifdef PIKE_DEBUG if (node != parent->next) rb_fatal (parent, "Childs parent doesn't know about it (stack probably wrong).\n"); #endif /* The mirrored version of the above. */ if (!(parent->flags & RB_THREAD_NEXT) && node->flags & RB_RED) { node->flags &= ~RB_RED; break; } #ifdef PIKE_DEBUG if (parent->flags & RB_THREAD_PREV) rb_fatal (parent, "Sibling in prev is null; tree was unbalanced.\n"); #endif sibling = parent->prev; if (sibling->flags & RB_RED) { /* Case 1 */ parent->flags |= RB_RED; sibling->flags &= ~RB_RED; rot_right (parent); RBSTACK_POP (rbstack, top); if (top) SET_PTR_TO_CHILD (top, parent, sibling, sibling); else top = sibling; RBSTACK_PUSH (rbstack, sibling); #ifdef PIKE_DEBUG if (parent->flags & RB_THREAD_PREV) rb_fatal (parent, "Sibling in prev is null; tree was unbalanced.\n"); #endif sibling = parent->prev; goto next_node_red_parent; } if (!(parent->flags & RB_RED)) { if ((sibling->flags & RB_THREAD_PREV || !(sibling->prev->flags & RB_RED)) && (sibling->flags & RB_THREAD_NEXT || !(sibling->next->flags & RB_RED))) { /* Case 2a */ sibling->flags |= RB_RED; node = parent; RBSTACK_POP (rbstack, parent); continue; } } else { next_node_red_parent: if ((sibling->flags & RB_THREAD_PREV || !(sibling->prev->flags & RB_RED)) && (sibling->flags & RB_THREAD_NEXT || !(sibling->next->flags & RB_RED))) { /* Case 2b */ parent->flags &= ~RB_RED; sibling->flags |= RB_RED; break; } } if (sibling->flags & RB_THREAD_PREV || !(sibling->prev->flags & RB_RED)) { /* Case 3 */ sibling->flags |= RB_RED; sibling = parent->prev = rot_left (sibling); sibling->flags &= ~RB_RED; } /* Case 4 */ rot_right (parent); RBSTACK_POP (rbstack, top); if (top) { SET_PTR_TO_CHILD (top, parent, sibling, sibling); if (parent->flags & RB_RED) { sibling->flags |= RB_RED; parent->flags &= ~RB_RED; } else sibling->flags &= ~RB_RED; } else { top = sibling; sibling->flags &= ~RB_RED; parent->flags &= ~RB_RED; } sibling->prev->flags &= ~RB_RED; break; } } while (parent); RBSTACK_FREE_SET_ROOT (rbstack, top); #ifdef PIKE_DEBUG if (top->flags & RB_RED) rb_fatal (top, "Root node not black.\n"); #endif return top; } void low_rb_init_root (struct rb_node_hdr *node) { #ifdef PIKE_DEBUG if (!node) fatal ("New node is null.\n"); #endif node->flags = (node->flags & ~RB_RED) | RB_THREAD_PREV | RB_THREAD_NEXT; node->prev = node->next = 0; } /* The passed stack is freed. */ void low_rb_link_at_prev (struct rb_node_hdr **tree, struct rbstack_ptr rbstack, struct rb_node_hdr *new) { struct rb_node_hdr *parent = RBSTACK_PEEK (rbstack); #ifdef PIKE_DEBUG if (!new) fatal ("New node is null.\n"); if (!parent) fatal ("Cannot link in root node.\n"); if (!(parent->flags & RB_THREAD_PREV)) fatal ("Cannot link in node at interior prev link.\n"); #endif new->flags |= RB_RED | RB_THREAD_PREV | RB_THREAD_NEXT; new->prev = parent->prev; new->next = parent; parent->flags &= ~RB_THREAD_PREV; parent->prev = new; *tree = rebalance_after_add (new, rbstack); } /* The passed stack is freed. */ void low_rb_link_at_next (struct rb_node_hdr **tree, struct rbstack_ptr rbstack, struct rb_node_hdr *new) { struct rb_node_hdr *parent = RBSTACK_PEEK (rbstack); #ifdef PIKE_DEBUG if (!new) fatal ("New node is null.\n"); if (!parent) fatal ("Cannot link in root node.\n"); if (!(parent->flags & RB_THREAD_NEXT)) fatal ("Cannot link in node at interior next link.\n"); #endif new->flags |= RB_RED | RB_THREAD_PREV | RB_THREAD_NEXT; new->prev = parent; new->next = parent->next; parent->flags &= ~RB_THREAD_NEXT; parent->next = new; *tree = rebalance_after_add (new, rbstack); } #define DO_SIMPLE_UNLINK(parent, unlink, node, replace_with) \ do { \ switch (replace_with) { \ DO_IF_DEBUG(default: fatal ("replace_with is %d.\n", replace_with)); \ case 0: \ if (parent) \ SET_PTR_TO_CHILD ( \ parent, unlink, \ (parent->flags |= RB_THREAD_PREV, node = unlink->prev), \ (parent->flags |= RB_THREAD_NEXT, node = unlink->next)); \ else \ node = 0; \ break; \ case 1: \ node = unlink->prev; \ DO_IF_DEBUG ( \ /* Since unlink->next is null, unlink->prev must be red and */ \ /* can't have children, or else the tree is unbalanced. */ \ if (!(node->flags & RB_THREAD_NEXT)) \ rb_fatal (parent, "Expected thread prev pointer in %p; " \ "tree is unbalanced.\n", node); \ ); \ node->next = unlink->next; \ goto fix_parent; \ case 2: \ node = unlink->next; \ DO_IF_DEBUG ( \ if (!(node->flags & RB_THREAD_PREV)) \ rb_fatal (parent, "Expected thread prev pointer in %p; " \ "tree is unbalanced.\n", node); \ ); \ node->prev = unlink->prev; \ fix_parent: \ if (parent) SET_PTR_TO_CHILD (parent, unlink, node, node); \ } \ } while (0) /* The node to unlink is the one on top of the stack. Returns the node * that actually got unlinked. The passed stack is freed. See * low_rb_delete about node_size. */ struct rb_node_hdr *low_rb_unlink (struct rb_node_hdr **tree, struct rbstack_ptr rbstack, size_t node_size) { struct rb_node_hdr *node, *parent, *unlink; int replace_with; /* 0: none, 1: prev, 2: next */ RBSTACK_POP (rbstack, node); #ifdef PIKE_DEBUG if (!node) fatal ("No node to delete on stack.\n"); #endif if (node->flags & RB_THREAD_PREV) { unlink = node; parent = RBSTACK_PEEK (rbstack); replace_with = node->flags & RB_THREAD_NEXT ? 0 : 2; } else if (node->flags & RB_THREAD_NEXT) { unlink = node; parent = RBSTACK_PEEK (rbstack); replace_with = 1; } else { /* Node has two subtrees, so we can't delete it. Find another one * to replace its data with. */ INT16 flags; parent = node; RBSTACK_PUSH (rbstack, node); for (unlink = node->next; !(unlink->flags & RB_THREAD_PREV); unlink = unlink->prev) { parent = unlink; RBSTACK_PUSH (rbstack, unlink); } replace_with = 3; flags = node->flags; MEMCPY ((char *) node + OFFSETOF (rb_node_hdr, flags), (char *) unlink + OFFSETOF (rb_node_hdr, flags), node_size - OFFSETOF (rb_node_hdr, flags)); node->flags = (node->flags & ~RB_FLAG_MASK) | (flags & RB_FLAG_MASK); if (parent == node) { node = unlink->next; if (unlink->flags & RB_THREAD_NEXT) parent->flags |= RB_THREAD_NEXT; else { #ifdef PIKE_DEBUG if (!(node->flags & RB_THREAD_PREV)) rb_fatal (parent, "Expected thread prev pointer in %p; " "tree is unbalanced.\n", node); #endif node->prev = unlink->prev; } parent->next = node; } else if (unlink->flags & RB_THREAD_NEXT) { parent->flags |= RB_THREAD_PREV; parent->prev = node = unlink->prev; } else { node = unlink->next; #ifdef PIKE_DEBUG if (!(node->flags & RB_THREAD_PREV)) rb_fatal (parent, "Expected thread prev pointer in %p; " "tree is unbalanced.\n", node); #endif node->prev = unlink->prev; parent->prev = node; } goto unlink_done; } DO_SIMPLE_UNLINK (parent, unlink, node, replace_with); unlink_done: if (unlink->flags & RB_RED) RBSTACK_FREE (rbstack); else *tree = rebalance_after_delete (node, rbstack); return unlink; } /* Like low_rb_unlink, but relinks the nodes instead of moving over * the data. Somewhat slower unless the size of the nodes is large. */ void low_rb_unlink_without_move (struct rb_node_hdr **tree, struct rbstack_ptr rbstack) { struct rb_node_hdr *node, *parent, *unlink; int unlink_flags, replace_with; /* 0: none, 1: prev, 2: next, 3: fixed already */ RBSTACK_POP (rbstack, node); #ifdef PIKE_DEBUG if (!node) fatal ("No node to delete on stack.\n"); #endif if (node->flags & RB_THREAD_PREV) { unlink = node; parent = RBSTACK_PEEK (rbstack); replace_with = node->flags & RB_THREAD_NEXT ? 0 : 2; } else if (node->flags & RB_THREAD_NEXT) { unlink = node; parent = RBSTACK_PEEK (rbstack); replace_with = 1; } else { /* Node has two subtrees, so we can't delete it. Find another one * to switch places with. */ struct rb_node_hdr *orig_parent = RBSTACK_PEEK (rbstack), *tmp; struct rbstack_ptr pos = rbstack; parent = unlink = node; RBSTACK_PUSH (rbstack, 0); for (node = node->next; !(node->flags & RB_THREAD_PREV); node = node->prev) { parent = node; RBSTACK_PUSH (rbstack, node); } pos.slice->stack[pos.ssp] = node; unlink_flags = node->flags; if (orig_parent) SET_PTR_TO_CHILD (orig_parent, unlink, node, node); else *tree = node; for (tmp = unlink->prev; !(tmp->flags & RB_THREAD_NEXT); tmp = tmp->next) {} tmp->next = node; node->prev = unlink->prev; if (parent == unlink) { /* node replaces its parent. */ node->flags = /* Keep the thread next flag. */ (node->flags & ~(RB_FLAG_MASK & ~RB_THREAD_NEXT)) | (unlink->flags & (RB_FLAG_MASK & ~RB_THREAD_NEXT)); parent = node; node = parent->next; } else { if (node->flags & RB_THREAD_NEXT) { parent->flags |= RB_THREAD_PREV; parent->prev = node; } else parent->prev = node->next; node->flags = (node->flags & ~RB_FLAG_MASK) | (unlink->flags & RB_FLAG_MASK); node->next = unlink->next; node = parent->prev; } goto unlink_done; } DO_SIMPLE_UNLINK (parent, unlink, node, replace_with); unlink_flags = unlink->flags; unlink_done: if (unlink_flags & RB_RED) RBSTACK_FREE (rbstack); else *tree = rebalance_after_delete (node, rbstack); } /* Returns the node in the tree. It might not be the passed new node * if an equal one was found. */ struct rb_node_hdr *low_rb_insert (struct rb_node_hdr **tree, low_rb_cmp_fn *cmp_fn, void *key, struct rb_node_hdr *new) { if (*tree) { struct rb_node_hdr *node = *tree; RBSTACK_INIT (rbstack); LOW_RB_TRACK (rbstack, node, cmp_res = cmp_fn (key, node), { low_rb_link_at_next (tree, rbstack, new); /* Got less. */ }, { /* Got equal - new not used. */ RBSTACK_FREE (rbstack); return node; }, { /* Got greater. */ low_rb_link_at_prev (tree, rbstack, new); }); } else { low_rb_init_root (new); *tree = new; } return new; } void low_rb_add (struct rb_node_hdr **tree, low_rb_cmp_fn *cmp_fn, void *key, struct rb_node_hdr *new) { if (*tree) { struct rb_node_hdr *node = *tree; RBSTACK_INIT (rbstack); LOW_RB_TRACK (rbstack, node, cmp_res = cmp_fn (key, node), { low_rb_link_at_next (tree, rbstack, new); /* Got less. */ }, { /* Got equal. */ if (node->flags & RB_THREAD_PREV) low_rb_link_at_prev (tree, rbstack, new); else if (node->flags & RB_THREAD_NEXT) low_rb_link_at_next (tree, rbstack, new); else { node = node->next; RBSTACK_PUSH (rbstack, node); while (!(node->flags & RB_THREAD_PREV)) { node = node->prev; RBSTACK_PUSH (rbstack, node); } low_rb_link_at_prev (tree, rbstack, new); } }, { low_rb_link_at_prev (tree, rbstack, new); /* Got greater. */ }); } else { low_rb_init_root (new); *tree = new; } } void low_rb_add_after (struct rb_node_hdr **tree, low_rb_cmp_fn *cmp_fn, void *key, struct rb_node_hdr *new, struct rb_node_hdr *existing) { if (*tree) { struct rb_node_hdr *node = *tree; RBSTACK_INIT (rbstack); if (existing) { #ifdef PIKE_DEBUG if (cmp_fn (key, existing)) fatal ("Given key doesn't match the existing node.\n"); #endif LOW_RB_TRACK (rbstack, node, cmp_res = cmp_fn (key, node) > 0 ? 1 : -1, ;, ;, ;); while (node != existing) { LOW_RB_TRACK_NEXT (rbstack, node); #ifdef PIKE_DEBUG if (!node) fatal ("Tree doesn't contain the existing node.\n"); #endif } if (node->flags & RB_THREAD_NEXT) { low_rb_link_at_next (tree, rbstack, new); return; } else node = node->next; } /* Link at lowest position. */ RBSTACK_PUSH (rbstack, node); while (!(node->flags & RB_THREAD_PREV)) { node = node->prev; RBSTACK_PUSH (rbstack, node); } low_rb_link_at_prev (tree, rbstack, new); } else { #ifdef PIKE_DEBUG if (existing) fatal ("Tree doesn't contain the existing node.\n"); #endif low_rb_init_root (new); *tree = new; } } /* Returns the node to free, if any. node_size is the size of the * whole node, including rb_node_hdr. It's used to move the data from * one node to another if the original node can't be removed. */ struct rb_node_hdr *low_rb_delete (struct rb_node_hdr **tree, low_rb_cmp_fn *cmp_fn, void *key, size_t node_size) { struct rb_node_hdr *node = *tree; if (node) { RBSTACK_INIT (rbstack); LOW_RB_TRACK (rbstack, node, cmp_res = cmp_fn (key, node), ;, /* Got less. */ return low_rb_unlink (tree, rbstack, node_size), /* Got equal. */ ;); /* Got greater. */ RBSTACK_FREE (rbstack); } return 0; } /* Like low_rb_delete, but relinks the nodes instead of moving the * data, when that's necessary. Somewhat slower unless the size of the * nodes is large. */ struct rb_node_hdr *low_rb_delete_without_move (struct rb_node_hdr **tree, low_rb_cmp_fn *cmp_fn, void *key) { struct rb_node_hdr *node = *tree; if (node) { RBSTACK_INIT (rbstack); LOW_RB_TRACK (rbstack, node, cmp_res = cmp_fn (key, node), ;, /* Got less. */ low_rb_unlink_without_move (tree, rbstack); /* Got equal. */ return node;, ;); /* Got greater. */ RBSTACK_FREE (rbstack); } return 0; } /* Returns the node to actually free. See low_rb_delete about * node_size. */ struct rb_node_hdr *low_rb_delete_node (struct rb_node_hdr **tree, low_rb_cmp_fn *cmp_fn, void *key, struct rb_node_hdr *to_delete, size_t node_size) { struct rb_node_hdr *node = *tree; RBSTACK_INIT (rbstack); #ifdef PIKE_DEBUG if (!node) fatal ("Tree is empty.\n"); if (cmp_fn (key, to_delete)) fatal ("Given key doesn't match the node to delete.\n"); #endif LOW_RB_TRACK (rbstack, node, cmp_res = cmp_fn (key, node) > 0 ? 1 : -1, ;, ;, ;); while (node != to_delete) { LOW_RB_TRACK_NEXT (rbstack, node); #ifdef PIKE_DEBUG if (!node) fatal ("Tree doesn't contain the node to delete.\n"); #endif } return low_rb_unlink (tree, rbstack, node_size); } void low_rb_delete_node_without_move (struct rb_node_hdr **tree, low_rb_cmp_fn *cmp_fn, void *key, struct rb_node_hdr *to_delete) { struct rb_node_hdr *node = *tree; RBSTACK_INIT (rbstack); #ifdef PIKE_DEBUG if (!node) fatal ("Tree is empty.\n"); if (cmp_fn (key, to_delete)) fatal ("Given key doesn't match the node to delete.\n"); #endif LOW_RB_TRACK (rbstack, node, cmp_res = cmp_fn (key, node) > 0 ? 1 : -1, ;, ;, ;); while (node != to_delete) { LOW_RB_TRACK_NEXT (rbstack, node); #ifdef PIKE_DEBUG if (!node) fatal ("Tree doesn't contain the node to delete.\n"); #endif } low_rb_unlink_without_move (tree, rbstack); } struct rb_node_hdr *low_rb_copy (struct rb_node_hdr *source, low_rb_copy_fn *copy_node_fn) { if (source) { struct rb_node_hdr *copy, *target, *new, *t_prev_tgt = 0, *t_next_src = 0; RBSTACK_INIT (s_stack); RBSTACK_INIT (t_stack); copy = target = copy_node_fn (source); copy->flags = (copy->flags & ~RB_FLAG_MASK) | (source->flags & RB_FLAG_MASK); LOW_RB_TRAVERSE (1, s_stack, source, { /* Push. */ }, { /* prev is leaf. */ target->prev = t_prev_tgt; }, { /* prev is subtree. */ new = target->prev = copy_node_fn (source->prev); new->flags = (new->flags & ~RB_FLAG_MASK) | (source->prev->flags & RB_FLAG_MASK); RBSTACK_PUSH (t_stack, target); target = new; }, { /* Between. */ t_prev_tgt = target; if (t_next_src) { t_next_src->next = target; t_next_src = 0; } }, { /* next is leaf. */ t_next_src = target; }, { /* next is subtree. */ new = target->next = copy_node_fn (source->next); new->flags = (new->flags & ~RB_FLAG_MASK) | (source->next->flags & RB_FLAG_MASK); RBSTACK_PUSH (t_stack, target); target = new; }, { /* Pop. */ RBSTACK_POP (t_stack, target); }); if (t_next_src) t_next_src->next = 0; return copy; } else return 0; } void low_rb_free (struct rb_node_hdr *tree, low_rb_free_fn *free_node_fn) { RBSTACK_INIT (rbstack); LOW_RB_TRAVERSE (1, rbstack, tree, ;, ;, ;, ;, ;, ;, free_node_fn (tree)); } struct rb_node_hdr *low_rb_find_eq (struct rb_node_hdr *tree, low_rb_cmp_fn *cmp_fn, void *key) { if (tree) LOW_RB_FIND (tree, cmp_res = cmp_fn (key, tree), ;, return tree, ;); return 0; } struct rb_node_hdr *low_rb_find_lt (struct rb_node_hdr *tree, low_rb_cmp_fn *cmp_fn, void *key) { if (tree) LOW_RB_FIND (tree, cmp_res = cmp_fn (key, tree) > 0 ? 1 : -1, return tree, ;, return tree->prev); return 0; } struct rb_node_hdr *low_rb_find_gt (struct rb_node_hdr *tree, low_rb_cmp_fn *cmp_fn, void *key) { if (tree) LOW_RB_FIND (tree, cmp_res = cmp_fn (key, tree) >= 0 ? 1 : -1, return tree->next, ;, return tree); return 0; } struct rb_node_hdr *low_rb_find_le (struct rb_node_hdr *tree, low_rb_cmp_fn *cmp_fn, void *key) { if (tree) LOW_RB_FIND (tree, cmp_res = cmp_fn (key, tree) >= 0 ? 1 : -1, return tree, ;, return tree->prev); return 0; } struct rb_node_hdr *low_rb_find_ge (struct rb_node_hdr *tree, low_rb_cmp_fn *cmp_fn, void *key) { if (tree) LOW_RB_FIND (tree, cmp_res = cmp_fn (key, tree) > 0 ? 1 : -1, return tree->next, ;, return tree); return 0; } void init_rbtree() { #ifdef PIKE_DEBUG union rb_node test; test.h.flags = 0; test.i.ind.type = (1 << 8) - 1; test.i.ind.subtype = (1 << 16) - 1; test.i.ind.u.refs = (INT32 *) (ptrdiff_t) -1; if (test.h.flags & (RB_IND_FLAG_MASK)) fatal ("The ind svalue overlays the flags field in an unexpected way.\n"); test.h.flags |= RB_FLAG_MASK; if (test.i.ind.type & RB_FLAG_MARKER) fatal ("The ind svalue overlays the flags field in an unexpected way.\n"); test.i.ind.type |= RB_FLAG_MARKER; if ((test.i.ind.type & ~RB_IND_FLAG_MASK) != (1 << 8) - 1) fatal ("The ind svalue overlays the flags field in an unexpected way.\n"); #endif init_rb_node_ind_blocks(); init_rb_node_indval_blocks(); } /* Pike may exit without calling this. */ void exit_rbtree() { free_all_rb_node_ind_blocks(); free_all_rb_node_indval_blocks(); } #if defined (PIKE_DEBUG) || defined (TEST_RBTREE) static void debug_dump_ind_data (struct rb_node_ind *node) { struct svalue tmp; print_svalue (stderr, use_rb_node_ind (node, tmp)); fputc (' ', stderr); } static void debug_dump_indval_data (struct rb_node_indval *node) { struct svalue tmp; print_svalue (stderr, use_rb_node_ind (node, tmp)); fputs (": ", stderr); print_svalue (stderr, &node->val); fputc (' ', stderr); } static void debug_dump_rb_tree (struct rb_node_hdr *tree, dump_data_fn *dump_data) { if (tree) { struct rb_node_hdr *n; struct rbstack_ptr p; RBSTACK_INIT (rbstack); LOW_RB_TRAVERSE (1, rbstack, tree, { /* Push. */ p = rbstack; RBSTACK_UP (p, n); while (n) { if (n == tree) { fprintf (stderr, "[Circular! %p]", tree); goto skip_1; } RBSTACK_UP (p, n); } fputc ('(', stderr); }, { /* prev is leaf. */ fprintf (stderr, "[%p]", tree->prev); }, { /* prev is subtree. */ if (!tree->prev) { fputs ("[Zero subtree!]", stderr); goto between_1; } }, { /* Between nodes. */ fprintf (stderr, " %p/%c", tree, tree->flags & RB_RED ? 'R' : 'B'); if (dump_data) { fputs (": ", stderr); dump_data (tree); } else fputc (' ', stderr); }, { /* next is leaf. */ fprintf (stderr, "[%p]", tree->next); }, { /* next is subtree. */ if (!tree->next) { fputs ("[Zero subtree!]", stderr); goto leave_1; } }, { /* Pop. */ fputc (')', stderr); }); fputc ('\n', stderr); } else fprintf (stderr, "(empty tree)\n"); } static void debug_rb_fatal (struct rb_node_hdr *tree, const char *fmt, ...) { va_list args; va_start (args, fmt); (void) VFPRINTF (stderr, fmt, args); fputs ("Dumping tree: ", stderr); debug_dump_rb_tree (tree, 0); debug_fatal ("\r"); } static void debug_rb_ind_fatal (struct rb_node_ind *tree, const char *fmt, ...) { va_list args; va_start (args, fmt); (void) VFPRINTF (stderr, fmt, args); fputs ("Dumping tree: ", stderr); debug_dump_rb_tree ((struct rb_node_hdr *) tree, (dump_data_fn *) debug_dump_ind_data); debug_fatal ("\r"); } static void debug_rb_indval_fatal (struct rb_node_indval *tree, const char *fmt, ...) { va_list args; va_start (args, fmt); (void) VFPRINTF (stderr, fmt, args); fputs ("Dumping tree: ", stderr); debug_dump_rb_tree ((struct rb_node_hdr *) tree, (dump_data_fn *) debug_dump_indval_data); debug_fatal ("\r"); } void debug_check_rb_tree (struct rb_node_hdr *tree) { if (tree) { struct rb_node_hdr *node = tree, *n, *n2; struct rbstack_ptr p; size_t blacks = 1, max_blacks = 0, depth = 0; RBSTACK_INIT (rbstack); if (tree->flags & RB_RED) rb_fatal (tree, "Root node not black.\n"); LOW_RB_TRAVERSE (1, rbstack, node, { /* Push. */ depth++; p = rbstack; RBSTACK_UP (p, n); while (n) { if (n == node) rb_fatal (tree, "Circular subtrees @ %p.\n", node); RBSTACK_UP (p, n); } if (!(node->flags & RB_RED)) blacks++; }, { /* prev is leaf. */ if (max_blacks) { if (blacks != max_blacks) rb_fatal (tree, "Unbalanced tree - leftmost branch is %d, " "prev @ %p is %d.\n", max_blacks, node, blacks); } else max_blacks = blacks; p = rbstack; n2 = node; RBSTACK_UP (p, n); while (n && (n->flags & RB_THREAD_NEXT || n->next != n2)) { n2 = n; RBSTACK_UP (p, n); } if (node->prev != n) rb_fatal (tree, "Thread prev pointer @ %p is %p, expected %p.\n", node, node->prev, n); }, { /* prev is subtree. */ if (!node->prev) rb_fatal (tree, "Subtree prev is null @ %p.\n", node); if (node->flags & RB_RED && node->prev->flags & RB_RED) rb_fatal (tree, "Red node got red subtree prev node @ %p.\n", node); }, { /* Between nodes. */ }, { /* next is leaf. */ if (blacks != max_blacks) rb_fatal (tree, "Unbalanced tree - leftmost branch is %d, " "next @ %p is %d.\n", max_blacks, node, blacks); p = rbstack; n2 = node; RBSTACK_UP (p, n); while (n && (n->flags & RB_THREAD_PREV || n->prev != n2)) { n2 = n; RBSTACK_UP (p, n); } if (node->next != n) rb_fatal (tree, "Thread next pointer @ %p is %p, expected %p.\n", node, node->next, n); }, { /* next is subtree. */ if (!node->next) rb_fatal (tree, "Subtree next is null @ %p.\n", node); if (node->flags & RB_RED && node->next->flags & RB_RED) rb_fatal (tree, "Red node got red subtree next node @ %p.\n", node); }, { /* Pop. */ if (!(node->flags & RB_RED)) blacks--; depth--; }); } } #ifdef TEST_RBTREE #define TEST_I_FIND(fn, exp) \ do { \ i_node = PIKE_CONCAT (rb_ind_, fn) (i_tree, sp - 1, 0); \ if (!i_node) \ rb_ind_fatal (i_tree, #fn " failed to find %d (%d).\n", exp, i); \ if (i_node->ind.u.integer != exp) \ rb_ind_fatal (i_tree, #fn " failed to find %d - got %d instead (%d).\n", \ exp, i_node->ind.u.integer, i); \ i_node = PIKE_CONCAT (rb_ind_, fn) (i_tree, sp - 1, less_efun); \ if (!i_node) \ rb_ind_fatal (i_tree, #fn " failed to find %d with cmp_less (%d).\n", \ exp, i); \ if (i_node->ind.u.integer != exp) \ rb_ind_fatal (i_tree, #fn " failed to find %d with cmp_less - " \ "got %d instead (%d).\n", exp, i_node->ind.u.integer, i); \ } while (0) #define TEST_I_NOT_FIND(fn) \ do { \ i_node = PIKE_CONCAT (rb_ind_, fn) (i_tree, sp - 1, 0); \ if (i_node) \ rb_ind_fatal (i_tree, #fn " failed to not find %d - got %d (%d).\n", \ sp[-1].u.integer, i_node->ind.u.integer, i); \ i_node = PIKE_CONCAT (rb_ind_, fn) (i_tree, sp - 1, less_efun); \ if (i_node) \ rb_ind_fatal (i_tree, #fn " failed to not find %d with cmp_less - " \ "got %d (%d).\n", \ sp[-1].u.integer, i_node->ind.u.integer, i); \ } while (0) #define TEST_I_STEP_FIND(fn, dir, exp) \ do { \ i_node = PIKE_CONCAT (rb_ind_, dir) (i_node); \ if (!i_node) \ rb_ind_fatal (i_tree, "Failed to step " #dir " to %d after " #fn \ " of %d (%d).\n", exp, sp[-1].u.integer, i); \ if (i_node->ind.u.integer != exp) \ rb_ind_fatal (i_tree, "Failed to step " #dir " to %d after " #fn \ " of %d - got %d instead (%d).\n", \ exp, sp[-1].u.integer, i_node->ind.u.integer, i); \ } while (0) #define TEST_I_STEP_NOT_FIND(fn, dir) \ do { \ i_node = PIKE_CONCAT (rb_ind_, dir) (i_node); \ if (i_node) \ rb_ind_fatal (i_tree, "Failed to step " #dir " to end after " #fn \ " of %d - got %d (%d).\n", \ sp[-1].u.integer, i_node->ind.u.integer, i); \ } while (0) #define TEST_IV_FIND(fn, exp) \ do { \ iv_node = PIKE_CONCAT (rb_indval_, fn) (iv_tree, sp - 1, 0); \ if (!iv_node) \ rb_indval_fatal (iv_tree, #fn " failed to find %d (%d).\n", exp, i); \ if (iv_node->ind.u.integer != exp) \ rb_indval_fatal (iv_tree, #fn " failed to find %d - " \ "got %d instead (%d).\n", exp, iv_node->ind.u.integer, i); \ iv_node = PIKE_CONCAT (rb_indval_, fn) (iv_tree, sp - 1, less_efun); \ if (!iv_node) \ rb_indval_fatal (iv_tree, #fn " failed to find %d with cmp_less (%d).\n", \ exp, i); \ if (iv_node->ind.u.integer != exp) \ rb_indval_fatal (iv_tree, #fn " failed to find %d with cmp_less - " \ "got %d instead (%d).\n", exp, iv_node->ind.u.integer, i); \ } while (0) #define TEST_IV_NOT_FIND(fn) \ do { \ iv_node = PIKE_CONCAT (rb_indval_, fn) (iv_tree, sp - 1, 0); \ if (iv_node) \ rb_indval_fatal (iv_tree, #fn " failed to not find %d - got %d (%d).\n", \ sp[-1].u.integer, iv_node->ind.u.integer, i); \ iv_node = PIKE_CONCAT (rb_indval_, fn) (iv_tree, sp - 1, less_efun); \ if (iv_node) \ rb_indval_fatal (iv_tree, #fn " failed to not find %d with cmp_less - " \ "got %d (%d).\n", \ sp[-1].u.integer, iv_node->ind.u.integer, i); \ } while (0) #define TEST_IV_STEP_FIND(fn, dir, exp) \ do { \ iv_node = PIKE_CONCAT (rb_indval_, dir) (iv_node); \ if (!iv_node) \ rb_indval_fatal (iv_tree, "Failed to step " #dir " to %d after " #fn \ " of %d (%d).\n", exp, sp[-1].u.integer, i); \ if (iv_node->ind.u.integer != exp) \ rb_indval_fatal (iv_tree, "Failed to step " #dir " to %d after " #fn \ " of %d - got %d instead (%d).\n", \ exp, sp[-1].u.integer, iv_node->ind.u.integer, i); \ } while (0) #define TEST_IV_STEP_NOT_FIND(fn, dir) \ do { \ iv_node = PIKE_CONCAT (rb_indval_, dir) (iv_node); \ if (iv_node) \ rb_indval_fatal (iv_tree, "Failed to step " #dir " to end after " #fn \ " of %d - got %d (%d).\n", \ sp[-1].u.integer, iv_node->ind.u.integer, i); \ } while (0) void test_rbtree() { size_t i; struct svalue *less_efun; struct array *a; struct rb_node_ind *i_tree = 0, *i_node; struct rb_node_indval *iv_tree = 0, *iv_node; push_svalue (simple_mapping_string_lookup (get_builtin_constants(), "`<")); less_efun = sp - 1; push_int (1); push_int (1); push_int (2); push_int (4); push_int (5); push_int (5); push_int (7); push_int (8); push_int (11); push_int (14); push_int (15); push_int (15); f_aggregate (12); for (i = 1*2*3*4*5*6*7*8*9; i > 0; i--) { int v; size_t j; if (!(i % 1000)) fprintf (stderr, "i %d \r", i); stack_dup(); push_int (i); f_permute (2); a = sp[-1].u.array; for (j = 0; j < 12; j++) { rb_ind_insert (&i_tree, &a->item[j], 0); debug_check_rb_tree (HDR (i_tree)); } for (j = 0, v = 0, i_node = rb_ind_first (i_tree); i_node; i_node = rb_ind_next (i_node), j++) { push_rb_node_ind (i_node); if (v >= sp[-1].u.integer) rb_ind_fatal (i_tree, "Failed to sort (%d).\n", i); v = sp[-1].u.integer; pop_stack(); } if (j != 9) rb_ind_fatal (i_tree, "Size of tree is wrong: %d (%d)\n", j, i); push_int (5); TEST_I_FIND (find_eq, 5); TEST_I_FIND (find_lt, 4); TEST_I_FIND (find_gt, 7); TEST_I_FIND (find_le, 5); TEST_I_FIND (find_ge, 5); pop_stack(); push_int (6); TEST_I_NOT_FIND (find_eq); TEST_I_FIND (find_lt, 5); TEST_I_FIND (find_gt, 7); TEST_I_FIND (find_le, 5); TEST_I_FIND (find_ge, 7); pop_stack(); push_int (0); TEST_I_NOT_FIND (find_eq); TEST_I_NOT_FIND (find_lt); TEST_I_FIND (find_gt, 1); TEST_I_NOT_FIND (find_le); TEST_I_FIND (find_ge, 1); pop_stack(); push_int (1); TEST_I_FIND (find_eq, 1); TEST_I_NOT_FIND (find_lt); TEST_I_FIND (find_gt, 2); TEST_I_FIND (find_le, 1); TEST_I_FIND (find_ge, 1); pop_stack(); push_int (15); TEST_I_FIND (find_eq, 15); TEST_I_FIND (find_lt, 14); TEST_I_NOT_FIND (find_gt); TEST_I_FIND (find_le, 15); TEST_I_FIND (find_ge, 15); pop_stack(); push_int (17); TEST_I_NOT_FIND (find_eq); TEST_I_FIND (find_lt, 15); TEST_I_NOT_FIND (find_gt); TEST_I_FIND (find_le, 15); TEST_I_NOT_FIND (find_ge); pop_stack(); i_node = rb_ind_copy (i_tree); debug_check_rb_tree (HDR (i_node)); for (j = 0, v = 0; j < 12; j++) { v += !!rb_ind_delete (&i_node, &a->item[j], 0); debug_check_rb_tree (HDR (i_node)); } if (v != 9 || i_node) rb_ind_fatal (i_node, "rb_ind_delete deleted " "wrong number of entries: %d (%d)\n", v, i); rb_ind_free (i_tree), i_tree = 0; pop_stack(); } pop_stack(); push_int (1); push_int (1); push_int (4); push_int (5); push_int (5); push_int (7); push_int (15); push_int (15); f_aggregate (8); for (i = 1*2*3*4*5*6*7*8; i > 0; i--) { int v; size_t j; if (!(i % 1000)) fprintf (stderr, "iv %d \r", i); stack_dup(); push_int (i); f_permute (2); a = sp[-1].u.array; { struct rb_node_indval *nodes[8]; push_int (17); for (j = 0; j < 8; j++) { for (iv_node = rb_indval_last (iv_tree); iv_node; iv_node = rb_indval_prev (iv_node)) { if (iv_node->val.u.integer <= a->item[j].u.integer) break; } nodes[j] = rb_indval_add_after (&iv_tree, iv_node, sp - 1, &a->item[j], 0); debug_check_rb_tree (HDR (iv_tree)); } for (j = 0, v = 0, iv_node = rb_indval_first (iv_tree); iv_node; iv_node = rb_indval_next (iv_node), j++) { if (v > iv_node->val.u.integer) rb_indval_fatal (iv_tree, "Failed to add in order (%d).\n", i); v = iv_node->val.u.integer; } if (j != 8) rb_indval_fatal (iv_tree, "Size of tree is wrong: %d (%d)\n", j, i); for (j = 0; j < 8; j++) { iv_node = rb_indval_delete_node (&iv_tree, nodes[j], 0); if (iv_node != nodes[j]) { for (v = j + 1;; v++) { if (v >= 8) rb_indval_fatal (iv_tree, "rb_indval_delete_node " "returned a bogus value.\n"); if (iv_node == nodes[v]) break; } nodes[v] = nodes[j]; } debug_check_rb_tree (HDR (iv_tree)); } if (iv_tree) rb_indval_fatal (iv_node, "rb_indval_delete_node didn't delete " "the whole tree (%d)\n", i); pop_stack(); } for (j = 0; j < 8; j++) { rb_indval_add (&iv_tree, &a->item[j], &a->item[j], 0); debug_check_rb_tree (HDR (iv_tree)); } for (j = 0, v = 0, iv_node = rb_indval_first (iv_tree); iv_node; iv_node = rb_indval_next (iv_node), j++) { push_rb_node_ind (iv_node); if (v > sp[-1].u.integer) rb_indval_fatal (iv_tree, "Failed to sort (%d).\n", i); v = sp[-1].u.integer; pop_stack(); } if (j != 8) rb_indval_fatal (iv_tree, "Size of tree is wrong: %d (%d)\n", j, i); push_int (5); TEST_IV_FIND (find_eq, 5); TEST_IV_FIND (find_lt, 4); TEST_IV_FIND (find_gt, 7); TEST_IV_FIND (find_le, 5); TEST_IV_STEP_FIND (find_le, next, 7); TEST_IV_FIND (find_ge, 5); TEST_IV_STEP_FIND (find_ge, prev, 4); pop_stack(); push_int (6); TEST_IV_NOT_FIND (find_eq); TEST_IV_FIND (find_lt, 5); TEST_IV_FIND (find_gt, 7); TEST_IV_FIND (find_le, 5); TEST_IV_STEP_FIND (find_le, next, 7); TEST_IV_FIND (find_ge, 7); TEST_IV_STEP_FIND (find_ge, prev, 5); pop_stack(); push_int (0); TEST_IV_NOT_FIND (find_eq); TEST_IV_NOT_FIND (find_lt); TEST_IV_FIND (find_gt, 1); TEST_IV_STEP_NOT_FIND (find_gt, prev); TEST_IV_NOT_FIND (find_le); TEST_IV_FIND (find_ge, 1); TEST_IV_STEP_FIND (find_ge, next, 1); pop_stack(); push_int (1); TEST_IV_FIND (find_eq, 1); TEST_IV_NOT_FIND (find_lt); TEST_IV_FIND (find_gt, 4); TEST_IV_FIND (find_le, 1); TEST_IV_STEP_FIND (find_le, next, 4); TEST_IV_FIND (find_ge, 1); TEST_IV_STEP_NOT_FIND (find_ge, prev); pop_stack(); push_int (15); TEST_IV_FIND (find_eq, 15); TEST_IV_FIND (find_lt, 7); TEST_IV_NOT_FIND (find_gt); TEST_IV_FIND (find_le, 15); TEST_IV_STEP_NOT_FIND (find_le, next); TEST_IV_FIND (find_ge, 15); TEST_IV_STEP_FIND (find_ge, prev, 7); pop_stack(); push_int (17); TEST_IV_NOT_FIND (find_eq); TEST_IV_FIND (find_lt, 15); TEST_IV_STEP_NOT_FIND (find_lt, next); TEST_IV_NOT_FIND (find_gt); TEST_IV_FIND (find_le, 15); TEST_IV_STEP_FIND (find_le, prev, 15); TEST_IV_NOT_FIND (find_ge); pop_stack(); iv_node = rb_indval_copy (iv_tree); debug_check_rb_tree (HDR (iv_node)); for (j = 0, v = 0; j < 8; j++) { v += !!rb_indval_delete (&iv_node, &a->item[j], 0); debug_check_rb_tree (HDR (iv_node)); } if (v != 8 || iv_node) rb_indval_fatal (iv_node, "rb_indval_delete deleted " "wrong number of entries: %d (%d)\n", v, i); for (v = 0; iv_tree; v++) { rb_indval_delete_node (&iv_tree, iv_tree, 0); debug_check_rb_tree (HDR (iv_tree)); } if (v != 8) rb_indval_fatal (iv_node, "rb_indval_delete_node deleted " "wrong number of entries: %d (%d)\n", v, i); pop_stack(); } pop_stack(); pop_stack(); fprintf (stderr, " \r"); } #endif /* TEST_RBTREE */ #endif /* PIKE_DEBUG */

pike.git/ src/ rbtree.c > 4a705a303b622f7e3653697dfd3bbc611b3319fd [Annotate]