/**************************************************************** * * * Copyright 2001, 2012 Fidelity Information Services, Inc * * * * This source code contains the intellectual property * * of its copyright holder(s), and is made available * * under a license. If you do not know the terms of * * the license, please stop and do not read further. * * * ****************************************************************/ /* * ------------------------------------------------------------------------------------------------------------ * op_merge.c * ============== * Description: * Main routine of MERGE command. * * Arguments: * Already op_merge_arg.c have saved all the inputs in merge_args and mglvnp. * * Return: * none * * Side Effects: * merge_args will be reset to 0 after successful operation. * * Notes: * ------------------------------------------------------------------------------------------------------------ */ #include "mdef.h" #include "min_max.h" #include "lv_val.h" #include #include "mv_stent.h" #include "gdsroot.h" #include "gdskill.h" #include "gtm_facility.h" #include "fileinfo.h" #include "gdsbt.h" #include "gdsfhead.h" #include "zshow.h" #include "zwrite.h" #include "filestruct.h" #include "gdscc.h" #include "copy.h" #include "jnl.h" #include "hashtab_int4.h" /* needed for tp.h */ #include "buddy_list.h" #include "tp.h" #include "gtm_string.h" #include "merge_def.h" #include "gvname_info.h" #include "op_merge.h" #include "gvsub2str.h" #include "op.h" #include "mvalconv.h" #include "stringpool.h" #include "outofband.h" #include "gtmmsg.h" #include "format_targ_key.h" #include "sgnl.h" #include "util.h" #include "collseq.h" #include "alias.h" #define UNDO_ACTIVE_LV \ { \ if (NULL != active_lv) \ { \ if (!LV_IS_VAL_DEFINED(active_lv) && !LV_HAS_CHILD(active_lv)) \ op_kill(active_lv); \ active_lv = (lv_val *)NULL; \ } \ } GBLREF sgmnt_addrs *cs_addrs; GBLREF mv_stent *mv_chain; GBLREF unsigned char *msp, *stackwarn, *stacktop; GBLREF int4 outofband; GBLREF uint4 dollar_tlevel; GBLREF gv_key *gv_currkey; GBLREF gd_region *gv_cur_region; GBLREF zshow_out *zwr_output; GBLREF int merge_args; GBLREF merge_glvn_ptr mglvnp; GBLREF gv_namehead *gv_target; GBLREF lvzwrite_datablk *lvzwrite_block; GBLREF lv_val *active_lv; error_def(ERR_MAXNRSUBSCRIPTS); error_def(ERR_MERGEINCOMPL); error_def(ERR_NCTCOLLDIFF); error_def(ERR_STACKCRIT); error_def(ERR_STACKOFLOW); void op_merge(void) { boolean_t found, check_for_null_subs, is_base_var, nontp_and_bgormm; lv_val *dst_lv; mval *mkey, *value, *subsc; int org_glvn1_keysz, org_glvn2_keysz, delta2, dollardata_src, dollardata_dst, sbs_depth; unsigned char *ptr, *ptr2; unsigned char buff[MAX_ZWR_KEY_SZ]; unsigned char nullcoll_src, nullcoll_dst; zshow_out output; DCL_THREADGBL_ACCESS; SETUP_THREADGBL_ACCESS; assert(MAX_STRLEN >= MAX_ZWR_KEY_SZ); assert ((merge_args == (MARG1_LCL | MARG2_LCL)) || (merge_args == (MARG1_LCL | MARG2_GBL)) || (merge_args == (MARG1_GBL | MARG2_LCL)) || (merge_args == (MARG1_GBL | MARG2_GBL))); assert(!lvzwrite_block || 0 == lvzwrite_block->curr_subsc); /* Need to protect value from stpgcol */ PUSH_MV_STENT(MVST_MVAL); value = &mv_chain->mv_st_cont.mvs_mval; value->mvtype = 0; /* initialize mval in the M-stack in case stp_gcol gets called before value gets initialized below */ if (MARG2_IS_GBL(merge_args)) { /* Need to protect mkey returned from gvcst_queryget from stpgcol */ PUSH_MV_STENT(MVST_MVAL); mkey = &mv_chain->mv_st_cont.mvs_mval; mkey->mvtype = 0; /* initialize mval in M-stack in case stp_gcol gets called before mkey gets initialized below */ gvname_env_restore(mglvnp->gblp[IND2]); /* now $DATA will be done for gvn2. op_gvdata input parameters are set in the form of some GBLREF */ op_gvdata(value); dollardata_src = MV_FORCE_INT(value); if (0 == dollardata_src) { /* nothing in source global */ UNDO_ACTIVE_LV; POP_MV_STENT(); /* value */ POP_MV_STENT(); /* mkey */ if (MARG1_IS_GBL(merge_args)) gvname_env_restore(mglvnp->gblp[IND1]); /* store destination as naked indicator in gv_currkey */ merge_args = 0; /* Must reset to zero to reuse the Global */ return; } nontp_and_bgormm = ((dba_bg == gv_cur_region->dyn.addr->acc_meth) || (dba_mm == gv_cur_region->dyn.addr->acc_meth)) && !dollar_tlevel; assert(!nontp_and_bgormm || gv_target->root); if (NULL == TREF(gv_mergekey2)) { /* We need to initialize gvn2 (right hand side). */ GVKEY_INIT(TREF(gv_mergekey2), DBKEYSIZE(MAX_KEY_SZ)); } org_glvn1_keysz = mglvnp->gblp[IND1]->s_gv_currkey->end + 1; org_glvn2_keysz = gv_currkey->end + 1; (TREF(gv_mergekey2))->end = gv_currkey->end; (TREF(gv_mergekey2))->prev = gv_currkey->prev; memcpy((TREF(gv_mergekey2))->base, gv_currkey->base, gv_currkey->end + 1); if (MARG1_IS_GBL(merge_args)) { /*==================== MERGE ^gvn1=^gvn2 =====================*/ if (mglvnp->gblp[IND2]->s_gv_target->nct != mglvnp->gblp[IND1]->s_gv_target->nct) rts_error(VARLSTCNT(1) ERR_NCTCOLLDIFF); /* if self merge then NOOP*/ if (!merge_desc_check()) /* will not proceed if one is descendant of another */ { gvname_env_restore(mglvnp->gblp[IND1]); /* store destination as naked indicator in gv_currkey */ POP_MV_STENT(); /* value */ merge_args = 0; /* Must reset to zero to reuse the Global */ return; } nullcoll_src = mglvnp->gblp[IND2]->s_gv_cur_region->std_null_coll; nullcoll_dst = mglvnp->gblp[IND1]->s_gv_cur_region->std_null_coll; if (1 == dollardata_src || 11 == dollardata_src) { found = op_gvget(value); /* value of ^glvn2 */ if (found) { /* SET ^gvn1=^gvn2 */ gvname_env_restore(mglvnp->gblp[IND1]); op_gvput(value); /* Note: If ^gvn1's null_sub=ALLOWEXISTING and say ^gvn1("")=^gvn, * this will give NULL_SUBC error */ } } check_for_null_subs = (NEVER != mglvnp->gblp[IND2]->s_gv_cur_region->null_subs) && (ALWAYS != mglvnp->gblp[IND1]->s_gv_cur_region->null_subs); /* Traverse descendant of ^gvn2 and copy into ^gvn1 */ for (; ;) { if (outofband) { gvname_env_restore(mglvnp->gblp[IND1]); /* naked indicator is restored into gv_currkey */ outofband_action(FALSE); } /* Restore last key under ^gvn2 we worked */ gvname_env_restore(mglvnp->gblp[IND2]); assert(0 == gv_currkey->base[gv_currkey->end - 1] && 0 == gv_currkey->base[gv_currkey->end]); /* following is an attempt to find immidiate right sibling */ gv_currkey->base[gv_currkey->end] = 1; gv_currkey->base[gv_currkey->end + 1] = 0; gv_currkey->base[gv_currkey->end + 2] = 0; gv_currkey->end += 2; # ifdef UNIX if (nontp_and_bgormm && (0 == gv_target->root)) { /* This is to handle root blocks moved by REORG. Merge alternates between two * different gv_targets. If op_gvput below detects a moved root block, it will * set the root of both to zero, but it will only redo root search for IND1. * We want op_gvqueryget to redo root search for IND2, so we fake its root * which will get it far enough to do so. */ cs_addrs->root_search_cycle--; gv_target->root = 2; } # endif /* Do atomic $QUERY and $GET of current glvn2: * mkey is a mstr which contains $QUERY result in database format (So no conversion necessary) * value is a mstr which contains $GET result */ if (!op_gvqueryget(mkey, value)) break; assert(MV_IS_STRING(mkey)); if (mkey->str.len < org_glvn2_keysz) break; if (0 != *((unsigned char *)mkey->str.addr + (TREF(gv_mergekey2))->end - 1) || memcmp(mkey->str.addr, (TREF(gv_mergekey2))->base, (TREF(gv_mergekey2))->end - 1)) break; /* mkey is not under the sub-tree */ delta2 = mkey->str.len - org_glvn2_keysz; /* length increase of source key */ assert (0 < delta2); /* Save the new source key for next iteration */ memcpy(mglvnp->gblp[IND2]->s_gv_currkey->base + org_glvn2_keysz - 2, mkey->str.addr + org_glvn2_keysz - 2, delta2 + 2); mglvnp->gblp[IND2]->s_gv_currkey->end = mkey->str.len - 1; /* Create the destination key for this iteration (under ^glvn1) */ gvname_env_restore(mglvnp->gblp[IND1]); if (gv_cur_region->max_key_size < org_glvn1_keysz + delta2) ISSUE_GVSUBOFLOW_ERROR(gv_currkey); assert(gv_currkey->end == org_glvn1_keysz - 1); memcpy(gv_currkey->base + org_glvn1_keysz - 2, mkey->str.addr + org_glvn2_keysz - 2, delta2 + 2); gv_currkey->end = org_glvn1_keysz + delta2 - 1; if (nullcoll_src != nullcoll_dst) { if (0 == nullcoll_dst) { /* Standard to GTM null subscript conversion*/ STD2GTMNULLCOLL((unsigned char *)gv_currkey->base + org_glvn1_keysz - 1, delta2 - 1); } else { /* GTM to standard null subscript conversion */ GTM2STDNULLCOLL((unsigned char *)gv_currkey->base + org_glvn1_keysz - 1, delta2 - 1); } } /* check null subscripts in destination key, note that we have already restored, destination global * and curresponding region, key information */ if (check_for_null_subs) { ptr2 = gv_currkey->base + gv_currkey->end - 1; for (ptr = gv_currkey->base + org_glvn1_keysz - 2; ptr < ptr2; ) { if (KEY_DELIMITER == *ptr++ && KEY_DELIMITER == *(ptr + 1) && (0 == gv_cur_region->std_null_coll ? (STR_SUB_PREFIX == *ptr) : (SUBSCRIPT_STDCOL_NULL == *ptr))) /* Note: For sgnl_gvnulsubsc/rts_error * we do not restore proper naked indicator. * The standard states that the effect of a MERGE command * on the naked indicator is that the naked indicator will be changed * as if a specific SET command would have been executed. * The standard also states that the effect on the naked indicator * will only take be visible after the MERGE command has completed. * So, if there is an error during the execution of a MERGE command, * the standard allows the naked indicator to reflect any intermediate * state. This provision was made intentionally, otherwise it would * have become nearly impossible to create a fully standard * implementation. : From Ed de Moel : 2/1/2 */ sgnl_gvnulsubsc(); } } /* Now put value of ^glvn2 descendant into corresponding descendant under ^glvn1 */ op_gvput(value); } gvname_env_restore(mglvnp->gblp[IND1]); /* store destination as naked indicator in gv_currkey */ } else { /*==================== MERGE lvn1=^gvn2 =====================*/ assert(MARG1_IS_LCL(merge_args)); assert(mglvnp->lclp[IND1]); /* Need to protect subsc created from global variable subscripts from stpgcol */ PUSH_MV_STENT(MVST_MVAL); subsc = &mv_chain->mv_st_cont.mvs_mval; /* Restore ^gvn2 we will work */ gvname_env_save(mglvnp->gblp[IND2]); if (1 == dollardata_src || 11 == dollardata_src) { /* SET lvn1=^gvn2 */ found = op_gvget(value); if (found) mglvnp->lclp[IND1]->v = *value; } for (; ;) { if (outofband) { gvname_env_restore(mglvnp->gblp[IND2]); /* naked indicator is restored into gv_currkey */ outofband_action(FALSE); } assert(0 == gv_currkey->base[gv_currkey->end - 1] && 0 == gv_currkey->base[gv_currkey->end]); /* following is an attempt to find immidiate right sibling */ gv_currkey->base[gv_currkey->end] = 1; gv_currkey->base[gv_currkey->end + 1] = 0; gv_currkey->base[gv_currkey->end + 2] = 0; gv_currkey->end += 2; /* Do $QUERY and $GET of current glvn2. Result will be in mkey and value respectively. * mkey->str contains data as database format. So no conversion necessary */ if (!op_gvqueryget(mkey, value)) break; if (mkey->str.len < (TREF(gv_mergekey2))->end + 1) break; ptr = (unsigned char *)mkey->str.addr + (TREF(gv_mergekey2))->end - 1; if (0 != *ptr || memcmp(mkey->str.addr, (TREF(gv_mergekey2))->base, (TREF(gv_mergekey2))->end - 1)) break; assert(MV_IS_STRING(mkey)); delta2 = mkey->str.len - org_glvn2_keysz; /* length increase of key */ assert (0 < delta2); /* Create next key for ^glvn2 */ memcpy(gv_currkey->base + org_glvn2_keysz - 2, mkey->str.addr + org_glvn2_keysz - 2, delta2 + 2); gv_currkey->end = mkey->str.len - 1; /* Now add subscripts to create the entire key */ dst_lv = mglvnp->lclp[IND1]; is_base_var = LV_IS_BASE_VAR(dst_lv); ptr = (unsigned char *)gv_currkey->base + org_glvn2_keysz - 1; assert(*ptr); do { LV_SBS_DEPTH(dst_lv, is_base_var, sbs_depth); if (MAX_LVSUBSCRIPTS <= sbs_depth) rts_error(VARLSTCNT(3) ERR_MERGEINCOMPL, 0, ERR_MAXNRSUBSCRIPTS); ptr2 = gvsub2str(ptr, buff, FALSE); subsc->mvtype = MV_STR; subsc->str.addr = (char *)buff; subsc->str.len = INTCAST(ptr2 - buff); s2pool(&subsc->str); dst_lv = op_putindx(VARLSTCNT(2) dst_lv, subsc); while (*ptr++); /* skip to start of next subscript */ is_base_var = FALSE; } while (*ptr); /* We created the key. Pre-process the node in case a container is being replaced, * then assign the value directly. Note there is no need to worry about MV_ALIASCONT * propagation since the source in this case is a global var. */ DECR_AC_REF(dst_lv, TRUE); dst_lv->v = *value; } gvname_env_restore(mglvnp->gblp[IND2]); /* naked indicator is restored into gv_currkey */ POP_MV_STENT(); /* subsc */ } POP_MV_STENT(); /* mkey */ } else { /* source is local */ op_fndata(mglvnp->lclp[IND2], value); dollardata_src = MV_FORCE_INT(value); if (0 == dollardata_src) { UNDO_ACTIVE_LV; POP_MV_STENT(); /* value */ if (MARG1_IS_GBL(merge_args)) gvname_env_restore(mglvnp->gblp[IND1]); /* store destination as naked indicator in gv_currkey */ merge_args = 0; /* Must reset to zero to reuse the Global */ return; } /* not memsetting output to 0 here can cause garbage value of output.out_var.lv.child which in turn can * cause a premature return from lvzwr_var resulting in op_merge() returning without having done the merge. */ memset(&output, 0, SIZEOF(output)); if (MARG1_IS_LCL(merge_args)) { /*==================== MERGE lvn1=lvn2 =====================*/ assert(mglvnp->lclp[IND1]); /* if self merge then NOOP */ if (!merge_desc_check()) /* will not proceed if one is descendant of another */ { POP_MV_STENT(); /* value */ merge_args = 0; /* Must reset to zero to reuse the Global */ return; } output.buff = (char *)buff; output.ptr = output.buff; output.out_var.lv.lvar = mglvnp->lclp[IND1]; zwr_output = &output; lvzwr_init(zwr_patrn_mident, &mglvnp->lclp[IND2]->v); lvzwr_arg(ZWRITE_ASTERISK, 0, 0); lvzwr_var(mglvnp->lclp[IND2], 0); /* assert that destination got all data of the source and its descendants */ DEBUG_ONLY(op_fndata(mglvnp->lclp[IND1], value)); DEBUG_ONLY(dollardata_dst = MV_FORCE_INT(value)); assert((dollardata_src & dollardata_dst) == dollardata_src); } else { /*==================== MERGE ^gvn1=lvn2 =====================*/ assert(MARG1_IS_GBL(merge_args) && MARG2_IS_LCL(merge_args)); gvname_env_save(mglvnp->gblp[IND1]); output.buff = (char *)buff; output.ptr = output.buff; output.out_var.gv.end = gv_currkey->end; output.out_var.gv.prev = gv_currkey->prev; zwr_output = &output; lvzwr_init(zwr_patrn_mident, &mglvnp->lclp[IND2]->v); lvzwr_arg(ZWRITE_ASTERISK, 0, 0); lvzwr_var(mglvnp->lclp[IND2], 0); gvname_env_restore(mglvnp->gblp[IND1]); /* store destination as naked indicator in gv_currkey */ } } POP_MV_STENT(); /* value */ merge_args = 0; /* Must reset to zero to reuse the Global */ }