Mercurial > repos > blastem
view arena.c @ 1863:d60f2d7c02a5
Differentiate between the full Sega mapper and the SRAM only one. Fixes crash on save state load for Phantasy Star IV and other games that use the same mapper
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 14 May 2019 23:20:35 -0700 |
parents | 4b8ab2d82aee |
children |
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/* Copyright 2015 Michael Pavone This file is part of BlastEm. BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. */ #include <stdlib.h> #include <stdint.h> #include "arena.h" struct arena { void **used_blocks; void **free_blocks; size_t used_count; size_t used_storage; size_t free_count; size_t free_storage; }; #define DEFAULT_STORAGE_SIZE 8 static arena *current_arena; arena *get_current_arena() { if (!current_arena) { current_arena = calloc(1, sizeof(arena)); } return current_arena; } arena *set_current_arena(arena *a) { arena *tmp = current_arena; current_arena = a; return tmp; } arena *start_new_arena() { arena *tmp = current_arena; current_arena = NULL; return tmp; } void track_block(void *block) { arena *cur = get_current_arena(); if (cur->used_count == cur->used_storage) { if (cur->used_storage) { cur->used_storage *= 2; } else { cur->used_storage = DEFAULT_STORAGE_SIZE; } cur->used_blocks = realloc(cur->used_blocks, cur->used_storage * sizeof(void *)); } cur->used_blocks[cur->used_count++] = block; } void mark_all_free() { arena *cur = get_current_arena(); if (!cur->free_blocks) { cur->free_blocks = cur->used_blocks; cur->free_storage = cur->used_storage; cur->free_count = cur->used_count; cur->used_count = cur->used_storage = 0; cur->used_blocks = NULL; } else { if (cur->free_storage < cur->used_count + cur->free_count) { cur->free_storage = cur->used_count + cur->free_count; cur->free_blocks = realloc(cur->free_blocks, cur->free_storage * sizeof(void*)); } for (; cur->used_count > 0; cur->used_count--) { cur->free_blocks[cur->free_count++] = cur->used_blocks[cur->used_count-1]; } } } void *try_alloc_arena() { if (!current_arena || !current_arena->free_count) { return NULL; } void *ret = current_arena->free_blocks[--current_arena->free_count]; track_block(ret); return ret; }