Add scratchpad
This commit is contained in:
Abdelrahman Said
@@ -0,0 +1,327 @@
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include "../src/wapp/wapp.h"
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/* ---------------------------------------------------------------------------
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* Pool allocator (arena-backed, intrusive free list)
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* -------------------------------------------------------------------------*/
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typedef struct PrPoolFreeNode PrPoolFreeNode;
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struct PrPoolFreeNode {
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PrPoolFreeNode *next;
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};
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typedef struct {
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WpAllocator *allocator;
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PrPoolFreeNode *free_head;
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u64 slot_size;
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} PrPool;
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static void prPoolInit(PrPool *pool, WpAllocator *arena, u64 slot_size) {
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pool->allocator = arena;
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pool->free_head = NULL;
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pool->slot_size = slot_size;
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}
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static void *prPoolAlloc(PrPool *pool) {
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if (pool->free_head) {
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PrPoolFreeNode *node = pool->free_head;
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pool->free_head = node->next;
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return node;
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}
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return wpMemAllocatorAlloc(pool->allocator, pool->slot_size);
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}
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static void prPoolFree(PrPool *pool, void *slot) {
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if (!slot) { return; }
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PrPoolFreeNode *node = (PrPoolFreeNode *)slot;
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node->next = pool->free_head;
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pool->free_head = node;
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}
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/* ---------------------------------------------------------------------------
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* Graph — unified nodes with values + forward/backward adjacency
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*
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* - Nodes live in a flat array; free slots are linked via next_free.
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* - Each node has a generation counter bumped on free; handles are
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* { index, generation } so stale references are detectable.
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* - Edges are pool-allocated PrEdgeNode structs with both forward
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* and backward linkage so deletion traces both directions.
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* -------------------------------------------------------------------------*/
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#define PR_INVALID_INDEX ((u64)-1)
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typedef struct PrEdgeNode PrEdgeNode;
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struct PrEdgeNode {
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PrEdgeNode *pool_next; /* used by pool free list when freed */
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PrEdgeNode *next_forward; /* chain in source's forward list */
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PrEdgeNode *next_backward; /* chain in target's backward list */
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u64 source_idx;
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u64 target_idx;
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};
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typedef struct {
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u64 index;
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u64 generation;
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} PrHandle;
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typedef struct {
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int value;
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u64 generation; /* bumped on every free */
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u64 next_free; /* free-list index (PR_INVALID_INDEX = active) */
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PrEdgeNode *forward_head; /* outgoing edges */
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PrEdgeNode *backward_head; /* incoming edges */
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} PrGraphNode;
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typedef struct {
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PrGraphNode *nodes; /* WpArray of PrGraphNode */
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u64 max_nodes;
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u64 max_ever; /* highest index ever allocated */
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u64 free_head; /* PR_INVALID_INDEX = empty */
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u64 count; /* active node count */
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PrPool edge_pool;
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} PrGraph;
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/* --- initialisation ---------------------------------------------------- */
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static void prGraphInit(PrGraph *g, WpAllocator *arena, u64 max_nodes) {
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g->nodes = wpArrayAllocCapacity(PrGraphNode, arena, max_nodes, WP_ARRAY_INIT_FILLED);
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g->max_nodes = max_nodes;
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g->max_ever = 0;
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g->free_head = PR_INVALID_INDEX;
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g->count = 0;
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prPoolInit(&g->edge_pool, arena, sizeof(PrEdgeNode));
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/* Build the free list — last slot's next_free stays PR_INVALID_INDEX */
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for (u64 i = 0; i < max_nodes; i++) {
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g->nodes[i].next_free = (i < max_nodes - 1) ? i + 1 : PR_INVALID_INDEX;
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}
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g->free_head = 0;
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}
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/* --- handle validation ------------------------------------------------ */
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static b8 prHandleValid(PrGraph *g, PrHandle h) {
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if (h.index >= g->max_nodes) { return false; }
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PrGraphNode *node = &g->nodes[h.index];
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return node->generation == h.generation && node->next_free == PR_INVALID_INDEX;
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}
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/* --- node management -------------------------------------------------- */
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static PrHandle prNodeAdd(PrGraph *g, int value) {
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if (g->free_head == PR_INVALID_INDEX) {
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return (PrHandle){ PR_INVALID_INDEX, 0 };
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}
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u64 idx = g->free_head;
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PrGraphNode *n = &g->nodes[idx];
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g->free_head = n->next_free;
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n->value = value;
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n->next_free = PR_INVALID_INDEX;
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n->forward_head = NULL;
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n->backward_head = NULL;
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g->count++;
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if (idx >= g->max_ever) { g->max_ever = idx + 1; }
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return (PrHandle){ idx, n->generation };
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}
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static int *prNodeGetValue(PrGraph *g, PrHandle h) {
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if (!prHandleValid(g, h)) { return NULL; }
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return &g->nodes[h.index].value;
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}
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/* --- internal: unlink edge helpers ------------------------------------ */
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static PrEdgeNode *_unlinkForward(PrGraph *g, u64 from_idx, u64 target_idx) {
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PrGraphNode *src = &g->nodes[from_idx];
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PrEdgeNode *prev = NULL;
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PrEdgeNode *curr = src->forward_head;
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while (curr) {
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if (curr->target_idx == target_idx) {
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if (prev) { prev->next_forward = curr->next_forward; }
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else { src->forward_head = curr->next_forward; }
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return curr;
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}
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prev = curr;
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curr = curr->next_forward;
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}
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return NULL;
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}
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static void _unlinkBackward(PrGraph *g, u64 to_idx, u64 source_idx) {
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PrGraphNode *dst = &g->nodes[to_idx];
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PrEdgeNode *prev = NULL;
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PrEdgeNode *curr = dst->backward_head;
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// This is intended to handle cases where the target node might not be the one
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// immediately feeding the node represented by to_idx
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while (curr) {
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if (curr->source_idx == source_idx) {
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if (prev) { prev->next_backward = curr->next_backward; }
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else { dst->backward_head = curr->next_backward; }
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return;
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}
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prev = curr;
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curr = curr->next_backward;
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}
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}
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/* --- edge management -------------------------------------------------- */
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static b8 prEdgeAdd(PrGraph *g, PrHandle from, PrHandle to) {
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if (!prHandleValid(g, from) || !prHandleValid(g, to)) { return false; }
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PrEdgeNode *edge = (PrEdgeNode *)prPoolAlloc(&g->edge_pool);
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if (!edge) { return false; }
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edge->source_idx = from.index;
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edge->target_idx = to.index;
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PrGraphNode *src = &g->nodes[from.index];
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edge->next_forward = src->forward_head;
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src->forward_head = edge;
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PrGraphNode *dst = &g->nodes[to.index];
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edge->next_backward = dst->backward_head;
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dst->backward_head = edge;
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return true;
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}
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/* --- node removal (tears down incident edges) ------------------------- */
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static void prNodeRemove(PrGraph *g, PrHandle h) {
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if (!prHandleValid(g, h)) { return; }
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u64 idx = h.index;
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PrGraphNode *n = &g->nodes[idx];
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/* Free outgoing edges: unlink from each target's backward list */
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PrEdgeNode *edge = n->forward_head;
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while (edge) {
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PrEdgeNode *next = edge->next_forward;
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_unlinkBackward(g, edge->target_idx, idx);
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prPoolFree(&g->edge_pool, edge);
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edge = next;
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}
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/* Free incoming edges: unlink from each source's forward list */
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edge = n->backward_head;
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while (edge) {
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PrEdgeNode *next = edge->next_backward;
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/* edge is also in the source's forward list — unlink by target_idx */
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_unlinkForward(g, edge->source_idx, idx);
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prPoolFree(&g->edge_pool, edge);
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edge = next;
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}
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/* Return node slot to free list with bumped generation */
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n->generation++;
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n->next_free = g->free_head;
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g->free_head = idx;
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g->count--;
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}
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/* --- traversal helpers ------------------------------------------------ */
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static void prDump(PrGraph *g) {
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printf("Active nodes: %llu\n\n", (unsigned long long)g->count);
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for (u64 i = 0; i < g->max_ever; i++) {
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PrGraphNode *n = &g->nodes[i];
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if (n->next_free != PR_INVALID_INDEX) { continue; }
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printf(" [%llu] g=%llu value=%d\n",
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(unsigned long long)i,
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(unsigned long long)n->generation,
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n->value);
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printf(" forward ──▶");
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PrEdgeNode *e = n->forward_head;
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if (!e) { printf(" (none)"); }
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while (e) {
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PrGraphNode *tv = &g->nodes[e->target_idx];
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printf(" %llu[%d]", (unsigned long long)e->target_idx, tv->value);
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e = e->next_forward;
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if (e) { printf(","); }
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}
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printf("\n");
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printf(" backward ◀──");
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e = n->backward_head;
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if (!e) { printf(" (none)"); }
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while (e) {
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PrGraphNode *sv = &g->nodes[e->source_idx];
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printf(" %llu[%d]", (unsigned long long)e->source_idx, sv->value);
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e = e->next_backward;
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if (e) { printf(","); }
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}
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printf("\n");
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}
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}
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/* ---------------------------------------------------------------------------
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* Demo
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* -------------------------------------------------------------------------*/
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int main(void) {
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srand((unsigned)time(NULL));
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WpAllocator arena = wpMemArenaAllocatorInitZero(KiB(64));
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if (wpMemAllocatorInvalid(&arena)) {
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fprintf(stderr, "arena init failed\n");
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return 1;
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}
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PrGraph g;
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prGraphInit(&g, &arena, 16);
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printf("=== Add 6 nodes ===\n");
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PrHandle nodes[10];
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for (u64 i = 0; i < 6; i++) {
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nodes[i] = prNodeAdd(&g, rand() % 100);
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printf(" node[%llu] = handle{%llu g%llu} val=%d\n",
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(unsigned long long)i,
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(unsigned long long)nodes[i].index,
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(unsigned long long)nodes[i].generation,
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*prNodeGetValue(&g, nodes[i]));
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}
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printf("\n=== Add edges: 0→1, 0→2, 1→3, 2→3, 3→4, 4→5 ===\n");
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u64 edge_list[][2] = { {0,1}, {0,2}, {1,3}, {2,3}, {3,4}, {4,5} };
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for (u64 i = 0; i < 6; i++) {
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u64 f = edge_list[i][0], t = edge_list[i][1];
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prEdgeAdd(&g, nodes[f], nodes[t]);
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}
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prDump(&g);
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printf("=== Remove node 2 (index %llu) ===\n",
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(unsigned long long)nodes[2].index);
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prNodeRemove(&g, nodes[2]);
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prDump(&g);
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printf("=== Stale check ===\n");
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printf(" nodes[2] handle{%llu g%llu} valid? %s\n",
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(unsigned long long)nodes[2].index,
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(unsigned long long)nodes[2].generation,
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prHandleValid(&g, nodes[2]) ? "YES" : "NO");
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printf("=== Add edge 5→0 (reuses freed edge slots) ===\n");
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prEdgeAdd(&g, nodes[5], nodes[0]);
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prDump(&g);
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printf("=== Add a new node (reuses freed node slot) ===\n");
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nodes[6] = prNodeAdd(&g, 42);
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printf(" new node = handle{%llu g%llu} val=%d\n",
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(unsigned long long)nodes[6].index,
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(unsigned long long)nodes[6].generation,
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*prNodeGetValue(&g, nodes[6]));
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prDump(&g);
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wpMemArenaAllocatorDestroy(&arena);
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return 0;
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}
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@@ -0,0 +1,353 @@
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// vim:fileencoding=utf-8:foldmethod=marker
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#include "../src/wapp/wapp.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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/* ---------------------------------------------------------------------------
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* Pool allocator (arena-backed, intrusive free list)
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* -------------------------------------------------------------------------*/
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typedef struct PrPoolFreeNode PrPoolFreeNode;
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struct PrPoolFreeNode {
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PrPoolFreeNode *next;
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};
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typedef struct {
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WpAllocator *allocator;
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PrPoolFreeNode *free_head;
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u64 slot_size;
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} PrPool;
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wp_intern void prPoolInit(PrPool *pool, WpAllocator *allocator, u64 slot_size) {
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pool->allocator = allocator;
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pool->free_head = NULL;
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pool->slot_size = slot_size;
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}
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wp_intern void *prPoolAlloc(PrPool *pool) {
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if (pool->free_head) {
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PrPoolFreeNode *node = pool->free_head;
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pool->free_head = node->next;
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return node;
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}
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return wpMemAllocatorAlloc(pool->allocator, pool->slot_size);
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}
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wp_intern void prPoolFree(PrPool *pool, void *slot) {
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if (!slot) { return; }
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PrPoolFreeNode *node = (PrPoolFreeNode *)slot;
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node->next = pool->free_head;
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pool->free_head = node;
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}
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/* ---------------------------------------------------------------------------
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* Graph
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* -------------------------------------------------------------------------*/
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#define INVALID_NODE_INDEX (u32)-1
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#define INVALID_NODE_ID ((PrNodeId){ .index = INVALID_NODE_INDEX, .generation = INVALID_NODE_INDEX })
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typedef enum {
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PR_NODE_TYPE_NONE,
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PR_NODE_TYPE_READ,
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PR_NODE_TYPE_BLUR,
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PR_NODE_TYPE_GRADE,
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COUNT_NODE_TYPES
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} PrNodeType;
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typedef struct {
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u32 index;
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u32 generation;
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} PrNodeId;
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typedef struct {
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union {
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WpStr8 path;
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f32 blur;
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f32 gain;
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} params;
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PrNodeType type;
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u32 generation;
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u32 next_free;
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} PrNode;
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typedef PrNode *PrNodeArray;
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/* ---------------------------------------------------------------------------
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* Graph Edge/Vertex type
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* If source or target are INVALID_NODE_ID, it should be treated as a vertex.
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* Otherwise, it should be treated as an edge. Think of it like homogeneous
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* coordinates where a vector {0, 0, 0, 0} is treated as a direction, while
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* a vector {0, 0, 0, 1} is treated as a point
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* ---------------------------------------------------------------------------*/
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typedef struct PrEdgeVertex PrEdgeVertex;
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struct PrEdgeVertex {
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PrEdgeVertex *next;
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PrEdgeVertex *prev;
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PrNodeId source;
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PrNodeId target;
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};
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typedef PrEdgeVertex *PrEdgeVertexArray;
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typedef struct {
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PrPool vertex_pool;
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PrNodeArray nodes;
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PrEdgeVertexArray vertices;
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u64 capacity;
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u64 max_count_ever;
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u64 count;
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u32 free_head;
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} PrGraph;
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wp_intern b8 prGraphIsStaleId(const PrGraph *graph, PrNodeId id) {
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u32 generation = graph->nodes[id.index].generation;
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return id.generation != generation;
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}
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wp_intern b8 prGraphIsActiveNode(const PrGraph *graph, PrNodeId id) {
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u32 next_free = graph->nodes[id.index].next_free;
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return !prGraphIsStaleId(graph, id) && next_free == INVALID_NODE_INDEX;
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}
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wp_intern PrNodeId prGraphGetNode(const PrGraph *graph, u32 index) {
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return (PrNodeId){ .index = index, .generation = graph->nodes[index].generation };
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}
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wp_intern void prGraphInit(PrGraph *graph, WpAllocator *allocator, u64 capacity) {
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graph->nodes = wpArrayAllocCapacity(PrNode, allocator, capacity, WP_ARRAY_INIT_FILLED);
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graph->vertices = wpArrayAllocCapacity(PrEdgeVertex, allocator, capacity, WP_ARRAY_INIT_FILLED);
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graph->free_head = 0;
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graph->capacity = capacity;
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graph->max_count_ever = 0;
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graph->count = 0;
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prPoolInit(&graph->vertex_pool, allocator, sizeof(PrEdgeVertex));
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memset(graph->nodes, 0, capacity * sizeof(PrNode));
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memset(graph->vertices, 0, capacity * sizeof(PrEdgeVertex));
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for (u64 i = 0; i < capacity; ++i) {
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graph->nodes[i].next_free = i < capacity - 1 ? i + 1 : INVALID_NODE_INDEX;
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graph->vertices[i].source = graph->vertices[i].target = INVALID_NODE_ID;
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}
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}
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wp_intern void prGraphAddEdge(PrGraph *graph, PrNodeId from, PrNodeId to) {
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if (!prGraphIsActiveNode(graph, from) || !prGraphIsActiveNode(graph, to)) { return; }
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PrEdgeVertex *edge = (PrEdgeVertex *)prPoolAlloc(&graph->vertex_pool);
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PrEdgeVertex *src = &graph->vertices[from.index];
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PrEdgeVertex *dst = &graph->vertices[to.index];
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edge->source = from;
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edge->target = to;
|
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edge->next = src->next;
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edge->prev = dst->prev;
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src->next = edge;
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dst->prev = edge;
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}
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||||
|
||||
wp_intern PrNodeId prGraphAddNode(PrGraph *graph, PrNodeType type) {
|
||||
u32 idx = graph->free_head;
|
||||
if (idx == INVALID_NODE_INDEX) { return INVALID_NODE_ID; }
|
||||
|
||||
PrNode *node = &graph->nodes[idx];
|
||||
|
||||
graph->free_head = node->next_free;
|
||||
node->next_free = INVALID_NODE_INDEX;
|
||||
node->type = type;
|
||||
memset(&node->params, 0, sizeof(node->params));
|
||||
|
||||
graph->count++;
|
||||
|
||||
if (idx + 1 > graph->max_count_ever) { graph->max_count_ever = idx + 1; }
|
||||
|
||||
return (PrNodeId){ .index = idx, .generation = node->generation };
|
||||
}
|
||||
|
||||
wp_intern void _unlinkForward(PrGraph *graph, PrNodeId from, PrEdgeVertex *edge) {
|
||||
if (!prGraphIsActiveNode(graph, from)) { return; }
|
||||
|
||||
PrEdgeVertex *src = &graph->vertices[from.index];
|
||||
PrEdgeVertex *curr = src->next;
|
||||
PrEdgeVertex *prev = NULL;
|
||||
while (curr) {
|
||||
if (curr == edge) {
|
||||
if (prev) {
|
||||
prev->next = curr->next;
|
||||
} else {
|
||||
src->next = curr->next;
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
prev = curr;
|
||||
curr = curr->next;
|
||||
}
|
||||
}
|
||||
|
||||
wp_intern void _unlinkBackward(PrGraph *graph, PrNodeId to, PrEdgeVertex *edge) {
|
||||
if (!prGraphIsActiveNode(graph, to)) { return; }
|
||||
|
||||
PrEdgeVertex *dst = &graph->vertices[to.index];
|
||||
PrEdgeVertex *curr = dst->prev;
|
||||
PrEdgeVertex *prev = NULL;
|
||||
while (curr) {
|
||||
if (curr == edge) {
|
||||
if (prev) {
|
||||
prev->prev = curr->prev;
|
||||
} else {
|
||||
dst->prev = curr->prev;
|
||||
}
|
||||
return;
|
||||
}
|
||||
|
||||
prev = curr;
|
||||
curr = curr->prev;
|
||||
}
|
||||
}
|
||||
|
||||
wp_intern void prGraphRemoveNode(PrGraph *graph, PrNodeId id) {
|
||||
if (!prGraphIsActiveNode(graph, id)) { return; }
|
||||
|
||||
PrNode *node = &graph->nodes[id.index];
|
||||
u32 next_gen = node->generation + 1;
|
||||
memset(node, 0, sizeof(PrNode));
|
||||
|
||||
node->generation = next_gen;
|
||||
node->next_free = graph->free_head;
|
||||
graph->free_head = id.index;
|
||||
|
||||
PrEdgeVertex *vertex = &graph->vertices[id.index];
|
||||
if (!(vertex->next) && !(vertex->prev)) {
|
||||
goto REMOVE_NODE_UNSET_POINTERS;
|
||||
}
|
||||
|
||||
PrEdgeVertex *curr = vertex->next;
|
||||
while (curr) {
|
||||
PrEdgeVertex *next = curr->next;
|
||||
_unlinkBackward(graph, curr->target, curr);
|
||||
prPoolFree(&graph->vertex_pool, curr);
|
||||
curr = next;
|
||||
}
|
||||
|
||||
curr = vertex->prev;
|
||||
while (curr) {
|
||||
PrEdgeVertex *prev = curr->prev;
|
||||
_unlinkForward(graph, curr->source, curr);
|
||||
prPoolFree(&graph->vertex_pool, curr);
|
||||
curr = prev;
|
||||
}
|
||||
|
||||
REMOVE_NODE_UNSET_POINTERS:
|
||||
vertex->next = vertex->prev = NULL;
|
||||
|
||||
graph->count--;
|
||||
}
|
||||
|
||||
wp_intern void prGraphDump(const PrGraph *graph) {
|
||||
printf("==============INPUTS==============\n");
|
||||
for (u64 i = 0; i < graph->max_count_ever; ++i) {
|
||||
PrNodeId id = prGraphGetNode(graph, i);
|
||||
if (!prGraphIsActiveNode(graph, id)) { continue; }
|
||||
|
||||
PrEdgeVertex *vertex = &graph->vertices[i];
|
||||
|
||||
printf("%u:", id.index + 1);
|
||||
|
||||
if (!(vertex->prev)) {
|
||||
printf(" (none)");
|
||||
} else {
|
||||
PrEdgeVertex *curr = vertex->prev;
|
||||
while (curr) {
|
||||
printf(" %u", curr->source.index + 1);
|
||||
curr = curr->prev;
|
||||
}
|
||||
}
|
||||
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
printf("==============OUTPUTS==============\n");
|
||||
for (u64 i = 0; i < graph->max_count_ever; ++i) {
|
||||
PrNodeId id = prGraphGetNode(graph, i);
|
||||
if (!prGraphIsActiveNode(graph, id)) { continue; }
|
||||
|
||||
PrEdgeVertex *vertex = &graph->vertices[i];
|
||||
|
||||
printf("%u:", id.index + 1);
|
||||
|
||||
if (!(vertex->next)) {
|
||||
printf(" (none)");
|
||||
} else {
|
||||
PrEdgeVertex *curr = vertex->next;
|
||||
while (curr) {
|
||||
printf(" %u", curr->target.index + 1);
|
||||
curr = curr->next;
|
||||
}
|
||||
}
|
||||
|
||||
printf("\n");
|
||||
}
|
||||
}
|
||||
|
||||
i32 main(void) {
|
||||
WpAllocator arena = wpMemArenaAllocatorInitZero(MiB(16));
|
||||
|
||||
PrGraph graph = {0};
|
||||
prGraphInit(&graph, &arena, 128);
|
||||
|
||||
PrNodeId n1 = prGraphAddNode(&graph, PR_NODE_TYPE_READ);
|
||||
PrNodeId n2 = prGraphAddNode(&graph, PR_NODE_TYPE_READ);
|
||||
PrNodeId n3 = prGraphAddNode(&graph, PR_NODE_TYPE_READ);
|
||||
PrNodeId n4 = prGraphAddNode(&graph, PR_NODE_TYPE_READ);
|
||||
PrNodeId n5 = prGraphAddNode(&graph, PR_NODE_TYPE_READ);
|
||||
|
||||
prGraphAddEdge(&graph, n1, n2);
|
||||
prGraphAddEdge(&graph, n1, n3);
|
||||
prGraphAddEdge(&graph, n1, n5);
|
||||
prGraphAddEdge(&graph, n2, n4);
|
||||
prGraphAddEdge(&graph, n3, n4);
|
||||
prGraphAddEdge(&graph, n3, n5);
|
||||
|
||||
prGraphDump(&graph);
|
||||
|
||||
prGraphRemoveNode(&graph, n3);
|
||||
|
||||
printf("\n");
|
||||
prGraphDump(&graph);
|
||||
|
||||
PrNodeId n6 = prGraphAddNode(&graph, PR_NODE_TYPE_READ);
|
||||
|
||||
prGraphAddEdge(&graph, n4, n6);
|
||||
|
||||
printf("\n");
|
||||
prGraphDump(&graph);
|
||||
|
||||
prGraphRemoveNode(&graph, n5);
|
||||
|
||||
printf("\n");
|
||||
prGraphDump(&graph);
|
||||
|
||||
PrNodeId n7 = prGraphAddNode(&graph, PR_NODE_TYPE_READ);
|
||||
|
||||
prGraphAddEdge(&graph, n1, n7);
|
||||
prGraphAddEdge(&graph, n2, n7);
|
||||
|
||||
printf("\n");
|
||||
prGraphDump(&graph);
|
||||
|
||||
PrNodeId n8 = prGraphAddNode(&graph, PR_NODE_TYPE_READ);
|
||||
|
||||
prGraphAddEdge(&graph, n6, n8);
|
||||
prGraphAddEdge(&graph, n7, n8);
|
||||
|
||||
printf("\n");
|
||||
prGraphDump(&graph);
|
||||
|
||||
wpMemArenaAllocatorDestroy(&arena);
|
||||
|
||||
return 0;
|
||||
}
|
||||
Reference in New Issue
Block a user