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58 lines
1.3 KiB
C
58 lines
1.3 KiB
C
#ifndef JIT_H
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#define JIT_H
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#include "misc.h"
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#include "emu/memory.h"
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#include "util/list.h"
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#if ENGINE_JIT
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#define JIT_INITIAL_HASH_SIZE (1 << 10)
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#define JIT_CACHE_SIZE (1 << 10)
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struct jit {
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// there is one jit per address space
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struct mem *mem;
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size_t mem_used;
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size_t num_blocks;
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struct list *hash;
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size_t hash_size;
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lock_t lock;
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};
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// this is roughly the average number of instructions in a basic block according to anonymous sources
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// times 4, roughly the average number of gadgets/parameters in an instruction, according to anonymous sources
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#define JIT_BLOCK_INITIAL_CAPACITY 16
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struct jit_block {
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addr_t addr;
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addr_t end_addr;
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size_t used;
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// pointers to the ip values in the last gadget
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unsigned long *jump_ip[2];
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// original values of *jump_ip[]
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unsigned long old_jump_ip[2];
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// blocks that jump to this block
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struct list jumps_from[2];
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// hashtable bucket links
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struct list chain;
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// list of blocks in a page
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struct list page[2];
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// links for jumps_from
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struct list jumps_from_links[2];
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unsigned long code[];
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};
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// Create a new jit
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struct jit *jit_new(struct mem *mem);
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void jit_free(struct jit *jit);
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// Invalidate all jit blocks in the given page. Locks the jit.
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void jit_invalidate_page(struct jit *jit, page_t page);
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#endif
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#endif
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