mirror of
https://github.com/Ed94/raddebugger.git
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336 lines
9.3 KiB
C
336 lines
9.3 KiB
C
// Copyright (c) 2024 Epic Games Tools
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// Licensed under the MIT license (https://opensource.org/license/mit/)
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////////////////////////////////
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//~ rjf: Basic Helpers
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#if !defined(BLAKE2_H)
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#define HAVE_SSE2
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#include "third_party/blake2/blake2.h"
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#include "third_party/blake2/blake2b.c"
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#endif
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internal U128
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hs_hash_from_data(String8 data)
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{
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U128 u128 = {0};
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blake2b((U8 *)&u128.u64[0], sizeof(u128), data.str, data.size, 0, 0);
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return u128;
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}
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////////////////////////////////
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//~ rjf: Main Layer Initialization
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internal void
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hs_init(void)
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{
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Arena *arena = arena_alloc();
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hs_shared = push_array(arena, HS_Shared, 1);
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hs_shared->arena = arena;
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hs_shared->slots_count = 4096;
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hs_shared->stripes_count = 64;
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hs_shared->slots = push_array(arena, HS_Slot, hs_shared->slots_count);
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hs_shared->stripes = push_array(arena, HS_Stripe, hs_shared->stripes_count);
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hs_shared->stripes_free_nodes = push_array(arena, HS_Node *, hs_shared->stripes_count);
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for(U64 idx = 0; idx < hs_shared->stripes_count; idx += 1)
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{
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HS_Stripe *stripe = &hs_shared->stripes[idx];
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stripe->arena = arena_alloc();
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stripe->rw_mutex = os_rw_mutex_alloc();
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stripe->cv = os_condition_variable_alloc();
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}
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hs_shared->key_slots_count = 4096;
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hs_shared->key_stripes_count = 64;
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hs_shared->key_slots = push_array(arena, HS_KeySlot, hs_shared->key_slots_count);
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hs_shared->key_stripes = push_array(arena, HS_Stripe, hs_shared->key_stripes_count);
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for(U64 idx = 0; idx < hs_shared->key_stripes_count; idx += 1)
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{
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HS_Stripe *stripe = &hs_shared->key_stripes[idx];
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stripe->arena = arena_alloc();
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stripe->rw_mutex = os_rw_mutex_alloc();
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stripe->cv = os_condition_variable_alloc();
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}
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hs_shared->evictor_thread = os_launch_thread(hs_evictor_thread__entry_point, 0, 0);
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}
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////////////////////////////////
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//~ rjf: Thread Context Initialization
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internal void
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hs_tctx_ensure_inited(void)
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{
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if(hs_tctx == 0)
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{
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Arena *arena = arena_alloc();
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hs_tctx = push_array(arena, HS_TCTX, 1);
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hs_tctx->arena = arena;
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}
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}
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////////////////////////////////
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//~ rjf: Cache Submission
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internal U128
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hs_submit_data(U128 key, Arena **data_arena, String8 data)
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{
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U64 key_slot_idx = key.u64[1]%hs_shared->key_slots_count;
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U64 key_stripe_idx = key_slot_idx%hs_shared->key_stripes_count;
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HS_KeySlot *key_slot = &hs_shared->key_slots[key_slot_idx];
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HS_Stripe *key_stripe = &hs_shared->key_stripes[key_stripe_idx];
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U128 hash = hs_hash_from_data(data);
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U64 slot_idx = hash.u64[1]%hs_shared->slots_count;
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U64 stripe_idx = slot_idx%hs_shared->stripes_count;
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HS_Slot *slot = &hs_shared->slots[slot_idx];
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HS_Stripe *stripe = &hs_shared->stripes[stripe_idx];
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//- rjf: commit data to cache - if already there, just bump key refcount
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OS_MutexScopeW(stripe->rw_mutex)
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{
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HS_Node *existing_node = 0;
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for(HS_Node *n = slot->first; n != 0; n = n->next)
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{
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if(u128_match(n->hash, hash))
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{
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existing_node = n;
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break;
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}
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}
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if(existing_node == 0)
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{
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HS_Node *node = hs_shared->stripes_free_nodes[stripe_idx];
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if(node)
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{
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SLLStackPop(hs_shared->stripes_free_nodes[stripe_idx]);
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}
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else
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{
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node = push_array(stripe->arena, HS_Node, 1);
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}
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node->hash = hash;
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node->arena = *data_arena;
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node->data = data;
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node->scope_ref_count = 0;
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node->key_ref_count = 1;
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DLLPushBack(slot->first, slot->last, node);
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}
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else
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{
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existing_node->key_ref_count += 1;
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arena_release(*data_arena);
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}
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*data_arena = 0;
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}
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//- rjf: commit this hash to key cache
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U128 key_expired_hash = {0};
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OS_MutexScopeW(key_stripe->rw_mutex)
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{
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HS_KeyNode *key_node = 0;
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for(HS_KeyNode *n = key_slot->first; n != 0; n = n->next)
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{
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if(u128_match(n->key, key))
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{
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key_node = n;
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break;
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}
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}
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if(!key_node)
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{
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key_node = push_array(key_stripe->arena, HS_KeyNode, 1);
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key_node->key = key;
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SLLQueuePush(key_slot->first, key_slot->last, key_node);
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}
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if(key_node)
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{
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if(key_node->hash_history_gen >= ArrayCount(key_node->hash_history))
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{
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key_expired_hash = key_node->hash_history[key_node->hash_history_gen%ArrayCount(key_node->hash_history)];
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}
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key_node->hash_history[key_node->hash_history_gen%ArrayCount(key_node->hash_history)] = hash;
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key_node->hash_history_gen += 1;
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}
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}
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//- rjf: if this key's history cache was full, dec key ref count of oldest hash
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if(!u128_match(key_expired_hash, u128_zero()))
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{
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U64 old_hash_slot_idx = key_expired_hash.u64[1]%hs_shared->slots_count;
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U64 old_hash_stripe_idx = old_hash_slot_idx%hs_shared->stripes_count;
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HS_Slot *old_hash_slot = &hs_shared->slots[old_hash_slot_idx];
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HS_Stripe *old_hash_stripe = &hs_shared->stripes[old_hash_stripe_idx];
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OS_MutexScopeR(old_hash_stripe->rw_mutex)
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{
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for(HS_Node *n = old_hash_slot->first; n != 0; n = n->next)
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{
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if(u128_match(n->hash, key_expired_hash))
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{
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ins_atomic_u64_dec_eval(&n->key_ref_count);
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break;
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}
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}
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}
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}
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return hash;
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}
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////////////////////////////////
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//~ rjf: Scoped Access
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internal HS_Scope *
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hs_scope_open(void)
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{
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hs_tctx_ensure_inited();
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HS_Scope *scope = hs_tctx->free_scope;
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if(scope)
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{
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SLLStackPop(hs_tctx->free_scope);
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}
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else
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{
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scope = push_array_no_zero(hs_tctx->arena, HS_Scope, 1);
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}
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MemoryZeroStruct(scope);
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return scope;
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}
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internal void
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hs_scope_close(HS_Scope *scope)
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{
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for(HS_Touch *touch = scope->top_touch, *next = 0; touch != 0; touch = next)
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{
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U128 hash = touch->hash;
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next = touch->next;
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U64 slot_idx = hash.u64[1]%hs_shared->slots_count;
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U64 stripe_idx = slot_idx%hs_shared->stripes_count;
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HS_Slot *slot = &hs_shared->slots[slot_idx];
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HS_Stripe *stripe = &hs_shared->stripes[stripe_idx];
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OS_MutexScopeR(stripe->rw_mutex)
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{
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for(HS_Node *n = slot->first; n != 0; n = n->next)
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{
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if(u128_match(hash, n->hash))
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{
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ins_atomic_u64_dec_eval(&n->scope_ref_count);
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break;
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}
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}
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}
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SLLStackPush(hs_tctx->free_touch, touch);
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}
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SLLStackPush(hs_tctx->free_scope, scope);
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}
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internal void
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hs_scope_touch_node__stripe_r_guarded(HS_Scope *scope, HS_Node *node)
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{
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HS_Touch *touch = hs_tctx->free_touch;
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ins_atomic_u64_inc_eval(&node->scope_ref_count);
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if(touch != 0)
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{
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SLLStackPop(hs_tctx->free_touch);
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}
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else
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{
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touch = push_array_no_zero(hs_tctx->arena, HS_Touch, 1);
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}
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MemoryZeroStruct(touch);
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touch->hash = node->hash;
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SLLStackPush(scope->top_touch, touch);
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}
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////////////////////////////////
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//~ rjf: Cache Lookup
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internal U128
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hs_hash_from_key(U128 key, U64 rewind_count)
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{
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U128 result = {0};
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U64 key_slot_idx = key.u64[1]%hs_shared->key_slots_count;
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U64 key_stripe_idx = key_slot_idx%hs_shared->key_stripes_count;
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HS_KeySlot *key_slot = &hs_shared->key_slots[key_slot_idx];
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HS_Stripe *key_stripe = &hs_shared->key_stripes[key_stripe_idx];
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OS_MutexScopeR(key_stripe->rw_mutex)
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{
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for(HS_KeyNode *n = key_slot->first; n != 0; n = n->next)
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{
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if(u128_match(n->key, key) && n->hash_history_gen > 0 && n->hash_history_gen-1 >= rewind_count)
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{
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result = n->hash_history[(n->hash_history_gen-1-rewind_count)%ArrayCount(n->hash_history)];
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break;
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}
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}
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}
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return result;
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}
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internal String8
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hs_data_from_hash(HS_Scope *scope, U128 hash)
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{
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String8 result = {0};
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U64 slot_idx = hash.u64[1]%hs_shared->slots_count;
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U64 stripe_idx = slot_idx%hs_shared->stripes_count;
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HS_Slot *slot = &hs_shared->slots[slot_idx];
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HS_Stripe *stripe = &hs_shared->stripes[stripe_idx];
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OS_MutexScopeR(stripe->rw_mutex)
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{
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for(HS_Node *n = slot->first; n != 0; n = n->next)
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{
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if(u128_match(n->hash, hash))
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{
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result = n->data;
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hs_scope_touch_node__stripe_r_guarded(scope, n);
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break;
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}
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}
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}
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return result;
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}
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////////////////////////////////
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//~ rjf: Evictor Thread
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internal void
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hs_evictor_thread__entry_point(void *p)
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{
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for(;;)
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{
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for(U64 slot_idx = 0; slot_idx < hs_shared->slots_count; slot_idx += 1)
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{
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U64 stripe_idx = slot_idx%hs_shared->stripes_count;
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HS_Slot *slot = &hs_shared->slots[slot_idx];
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HS_Stripe *stripe = &hs_shared->stripes[stripe_idx];
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B32 slot_has_work = 0;
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OS_MutexScopeR(stripe->rw_mutex)
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{
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for(HS_Node *n = slot->first; n != 0; n = n->next)
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{
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U64 key_ref_count = ins_atomic_u64_eval(&n->key_ref_count);
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U64 scope_ref_count = ins_atomic_u64_eval(&n->scope_ref_count);
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if(key_ref_count == 0 && scope_ref_count == 0)
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{
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slot_has_work = 1;
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break;
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}
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}
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}
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if(slot_has_work) OS_MutexScopeW(stripe->rw_mutex)
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{
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for(HS_Node *n = slot->first, *next = 0; n != 0; n = next)
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{
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next = n->next;
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U64 key_ref_count = ins_atomic_u64_eval(&n->key_ref_count);
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U64 scope_ref_count = ins_atomic_u64_eval(&n->scope_ref_count);
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if(key_ref_count == 0 && scope_ref_count == 0)
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{
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DLLRemove(slot->first, slot->last, n);
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SLLStackPush(hs_shared->stripes_free_nodes[stripe_idx], n);
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arena_release(n->arena);
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}
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}
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}
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}
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os_sleep_milliseconds(1000);
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}
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}
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