86 lines
3.9 KiB
C
86 lines
3.9 KiB
C
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/****************************************************************
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* *
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* Copyright 2001, 2011 Fidelity Information Services, Inc *
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* *
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* This source code contains the intellectual property *
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* of its copyright holder(s), and is made available *
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* under a license. If you do not know the terms of *
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* the license, please stop and do not read further. *
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* *
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****************************************************************/
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#include "mdef.h"
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#include "gtm_stdio.h"
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#include "gtm_string.h"
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#include "cache.h"
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#include "hashtab_objcode.h"
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#include "cachectl.h"
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#include "cacheflush.h"
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#include "rtnhdr.h"
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#include "gtm_text_alloc.h"
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#include "io.h"
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GBLREF hash_table_objcode cache_table;
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GBLREF int indir_cache_mem_size;
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GBLREF uint4 max_cache_memsize; /* Maximum bytes used for indirect cache object code */
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GBLREF uint4 max_cache_entries; /* Maximum number of cached indirect compilations */
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void cache_put(icode_str *src, mstr *object)
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{
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cache_entry *csp;
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int i, fixup_cnt;
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mval *fix_base, *fix;
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var_tabent *var_base, *varent;
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ht_ent_objcode *tabent;
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boolean_t added;
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indir_cache_mem_size += (ICACHE_SIZE + object->len);
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if (indir_cache_mem_size > max_cache_memsize || cache_table.count > max_cache_entries)
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cache_table_rebuild();
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csp = (cache_entry *)GTM_TEXT_ALLOC(ICACHE_SIZE + object->len);
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csp->obj.addr = (char *)csp + ICACHE_SIZE;
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csp->refcnt = csp->zb_refcnt = 0;
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csp->src = *src;
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csp->obj.len = object->len;
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memcpy(csp->obj.addr, object->addr, object->len);
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((ihdtyp *)(csp->obj.addr))->indce = csp; /* Set backward link to this cache entry */
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added = add_hashtab_objcode(&cache_table, &csp->src, csp, &tabent);
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assert(added);
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DBGCACHE((stdout, "cache_put: Added to cache lookaside %d bytes - (%d/%d/%d %d/%d) code: %d src: %.*s\n",
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ICACHE_SIZE + object->len, cache_table.count, cache_table.size, max_cache_entries,
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indir_cache_mem_size, max_cache_memsize, src->code, src->str.len, src->str.addr));
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DBGCACHE((stdout, "cache_put: *** updated entry: 0x"lvaddr" value: 0x"lvaddr"\n\n", tabent, tabent->value));
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/* Do address fixup on the literals that preceed the code */
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fixup_cnt = ((ihdtyp *)(csp->obj.addr))->fixup_vals_num;
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if (fixup_cnt)
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{
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/* Do address fixups for literals in indirect code. This is done by making them point
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* to the literals that are still resident in the stringpool. The rest of the old object
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* code will be garbage collected but these literals will be salvaged. The reason to point
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* to the stringpool version instead of in the copy we just created is that if an assignment
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* to a local variable from an indirect string literal were to occur, only the mval is copied.
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* So then there would be a local variable mval pointing into our malloc'd storage instead of
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* the stringpool. If the cache entry were recycled to hold a different object, the local
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* mval would then be pointing at garbage. By pointing these literals to their stringpool
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* counterparts, we save having to (re)copy them to the stringpool where they will be handled
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* safely and correctly.
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*/
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fix_base = (mval *)((unsigned char *)csp->obj.addr + ((ihdtyp *)(csp->obj.addr))->fixup_vals_off);
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for (fix = fix_base, i = 0 ; i < fixup_cnt ; i++, fix++)
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{
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if (MV_IS_STRING(fix)) /* if string, place in string pool */
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fix->str.addr = (INTPTR_T)fix->str.addr + object->addr;
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}
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}
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fixup_cnt = ((ihdtyp *)(csp->obj.addr))->vartab_len;
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if (fixup_cnt)
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{
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/* Do address fix up of local variable name which is in stringpool */
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var_base = (var_tabent *)((unsigned char *)csp->obj.addr + ((ihdtyp *)(csp->obj.addr))->vartab_off);
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for (varent = var_base, i = 0; i < fixup_cnt; i++, varent++)
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varent->var_name.addr = (INTPTR_T) varent->var_name.addr + object->addr;
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}
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*object = csp->obj; /* Update location of object code for comp_indr */
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cacheflush(csp->obj.addr, csp->obj.len, BCACHE);
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}
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