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https://git.postgresql.org/git/postgresql.git
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220db7ccd8
strings. This patch introduces four support functions cstring_to_text, cstring_to_text_with_len, text_to_cstring, and text_to_cstring_buffer, and two macros CStringGetTextDatum and TextDatumGetCString. A number of existing macros that provided variants on these themes were removed. Most of the places that need to make such conversions now require just one function or macro call, in place of the multiple notational layers that used to be needed. There are no longer any direct calls of textout or textin, and we got most of the places that were using handmade conversions via memcpy (there may be a few still lurking, though). This commit doesn't make any serious effort to eliminate transient memory leaks caused by detoasting toasted text objects before they reach text_to_cstring. We changed PG_GETARG_TEXT_P to PG_GETARG_TEXT_PP in a few places where it was easy, but much more could be done. Brendan Jurd and Tom Lane
643 lines
13 KiB
C
643 lines
13 KiB
C
#include "hstore.h"
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#include "utils/array.h"
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#include "catalog/pg_type.h"
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#include "funcapi.h"
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#include <access/heapam.h>
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#include <fmgr.h>
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static HEntry *
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findkey(HStore * hs, char *key, int keylen)
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{
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HEntry *StopLow = ARRPTR(hs);
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HEntry *StopHigh = StopLow + hs->size;
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HEntry *StopMiddle;
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int difference;
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char *base = STRPTR(hs);
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while (StopLow < StopHigh)
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{
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StopMiddle = StopLow + (StopHigh - StopLow) / 2;
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if (StopMiddle->keylen == keylen)
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difference = strncmp(base + StopMiddle->pos, key, StopMiddle->keylen);
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else
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difference = (StopMiddle->keylen > keylen) ? 1 : -1;
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if (difference == 0)
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return StopMiddle;
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else if (difference < 0)
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StopLow = StopMiddle + 1;
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else
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StopHigh = StopMiddle;
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}
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return NULL;
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}
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PG_FUNCTION_INFO_V1(fetchval);
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Datum fetchval(PG_FUNCTION_ARGS);
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Datum
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fetchval(PG_FUNCTION_ARGS)
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{
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HStore *hs = PG_GETARG_HS(0);
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text *key = PG_GETARG_TEXT_P(1);
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HEntry *entry;
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text *out;
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if ((entry = findkey(hs, VARDATA(key), VARSIZE(key) - VARHDRSZ)) == NULL || entry->valisnull)
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{
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PG_FREE_IF_COPY(hs, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_RETURN_NULL();
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}
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out = cstring_to_text_with_len(STRPTR(hs) + entry->pos + entry->keylen,
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entry->vallen);
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PG_FREE_IF_COPY(hs, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_RETURN_TEXT_P(out);
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}
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PG_FUNCTION_INFO_V1(exists);
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Datum exists(PG_FUNCTION_ARGS);
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Datum
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exists(PG_FUNCTION_ARGS)
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{
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HStore *hs = PG_GETARG_HS(0);
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text *key = PG_GETARG_TEXT_P(1);
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HEntry *entry;
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entry = findkey(hs, VARDATA(key), VARSIZE(key) - VARHDRSZ);
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PG_FREE_IF_COPY(hs, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_RETURN_BOOL(entry);
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}
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PG_FUNCTION_INFO_V1(defined);
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Datum defined(PG_FUNCTION_ARGS);
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Datum
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defined(PG_FUNCTION_ARGS)
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{
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HStore *hs = PG_GETARG_HS(0);
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text *key = PG_GETARG_TEXT_P(1);
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HEntry *entry;
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bool res;
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entry = findkey(hs, VARDATA(key), VARSIZE(key) - VARHDRSZ);
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res = (entry && !entry->valisnull) ? true : false;
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PG_FREE_IF_COPY(hs, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_RETURN_BOOL(res);
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}
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PG_FUNCTION_INFO_V1(delete);
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Datum delete(PG_FUNCTION_ARGS);
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Datum
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delete(PG_FUNCTION_ARGS)
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{
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HStore *hs = PG_GETARG_HS(0);
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text *key = PG_GETARG_TEXT_P(1);
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HStore *out = palloc(VARSIZE(hs));
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char *ptrs,
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*ptrd;
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HEntry *es,
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*ed;
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SET_VARSIZE(out, VARSIZE(hs));
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out->size = hs->size; /* temporary! */
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ptrs = STRPTR(hs);
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es = ARRPTR(hs);
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ptrd = STRPTR(out);
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ed = ARRPTR(out);
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while (es - ARRPTR(hs) < hs->size)
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{
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if (!(es->keylen == VARSIZE(key) - VARHDRSZ && strncmp(ptrs, VARDATA(key), es->keylen) == 0))
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{
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memcpy(ed, es, sizeof(HEntry));
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memcpy(ptrd, ptrs, es->keylen + ((es->valisnull) ? 0 : es->vallen));
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ed->pos = ptrd - STRPTR(out);
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ptrd += es->keylen + ((es->valisnull) ? 0 : es->vallen);
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ed++;
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}
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ptrs += es->keylen + ((es->valisnull) ? 0 : es->vallen);
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es++;
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}
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if (ed - ARRPTR(out) != out->size)
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{
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int buflen = ptrd - STRPTR(out);
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ptrd = STRPTR(out);
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out->size = ed - ARRPTR(out);
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memmove(STRPTR(out), ptrd, buflen);
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SET_VARSIZE(out, CALCDATASIZE(out->size, buflen));
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}
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PG_FREE_IF_COPY(hs, 0);
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PG_FREE_IF_COPY(key, 1);
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PG_RETURN_POINTER(out);
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}
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PG_FUNCTION_INFO_V1(hs_concat);
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Datum hs_concat(PG_FUNCTION_ARGS);
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Datum
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hs_concat(PG_FUNCTION_ARGS)
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{
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HStore *s1 = PG_GETARG_HS(0);
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HStore *s2 = PG_GETARG_HS(1);
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HStore *out = palloc(VARSIZE(s1) + VARSIZE(s2));
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char *ps1,
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*ps2,
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*pd;
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HEntry *es1,
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*es2,
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*ed;
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SET_VARSIZE(out, VARSIZE(s1) + VARSIZE(s2));
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out->size = s1->size + s2->size;
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ps1 = STRPTR(s1);
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ps2 = STRPTR(s2);
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pd = STRPTR(out);
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es1 = ARRPTR(s1);
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es2 = ARRPTR(s2);
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ed = ARRPTR(out);
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while (es1 - ARRPTR(s1) < s1->size && es2 - ARRPTR(s2) < s2->size)
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{
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int difference;
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if (es1->keylen == es2->keylen)
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difference = strncmp(ps1, ps2, es1->keylen);
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else
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difference = (es1->keylen > es2->keylen) ? 1 : -1;
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if (difference == 0)
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{
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memcpy(ed, es2, sizeof(HEntry));
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memcpy(pd, ps2, es2->keylen + ((es2->valisnull) ? 0 : es2->vallen));
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ed->pos = pd - STRPTR(out);
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pd += es2->keylen + ((es2->valisnull) ? 0 : es2->vallen);
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ed++;
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ps1 += es1->keylen + ((es1->valisnull) ? 0 : es1->vallen);
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es1++;
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ps2 += es2->keylen + ((es2->valisnull) ? 0 : es2->vallen);
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es2++;
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}
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else if (difference > 0)
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{
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memcpy(ed, es2, sizeof(HEntry));
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memcpy(pd, ps2, es2->keylen + ((es2->valisnull) ? 0 : es2->vallen));
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ed->pos = pd - STRPTR(out);
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pd += es2->keylen + ((es2->valisnull) ? 0 : es2->vallen);
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ed++;
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ps2 += es2->keylen + ((es2->valisnull) ? 0 : es2->vallen);
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es2++;
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}
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else
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{
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memcpy(ed, es1, sizeof(HEntry));
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memcpy(pd, ps1, es1->keylen + ((es1->valisnull) ? 0 : es1->vallen));
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ed->pos = pd - STRPTR(out);
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pd += es1->keylen + ((es1->valisnull) ? 0 : es1->vallen);
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ed++;
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ps1 += es1->keylen + ((es1->valisnull) ? 0 : es1->vallen);
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es1++;
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}
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}
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while (es1 - ARRPTR(s1) < s1->size)
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{
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memcpy(ed, es1, sizeof(HEntry));
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memcpy(pd, ps1, es1->keylen + ((es1->valisnull) ? 0 : es1->vallen));
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ed->pos = pd - STRPTR(out);
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pd += es1->keylen + ((es1->valisnull) ? 0 : es1->vallen);
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ed++;
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ps1 += es1->keylen + ((es1->valisnull) ? 0 : es1->vallen);
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es1++;
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}
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while (es2 - ARRPTR(s2) < s2->size)
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{
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memcpy(ed, es2, sizeof(HEntry));
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memcpy(pd, ps2, es2->keylen + ((es2->valisnull) ? 0 : es2->vallen));
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ed->pos = pd - STRPTR(out);
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pd += es2->keylen + ((es2->valisnull) ? 0 : es2->vallen);
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ed++;
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ps2 += es2->keylen + ((es2->valisnull) ? 0 : es2->vallen);
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es2++;
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}
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if (ed - ARRPTR(out) != out->size)
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{
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int buflen = pd - STRPTR(out);
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pd = STRPTR(out);
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out->size = ed - ARRPTR(out);
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memmove(STRPTR(out), pd, buflen);
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SET_VARSIZE(out, CALCDATASIZE(out->size, buflen));
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}
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PG_FREE_IF_COPY(s1, 0);
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PG_FREE_IF_COPY(s2, 1);
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PG_RETURN_POINTER(out);
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}
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PG_FUNCTION_INFO_V1(tconvert);
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Datum tconvert(PG_FUNCTION_ARGS);
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Datum
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tconvert(PG_FUNCTION_ARGS)
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{
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text *key;
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text *val = NULL;
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int len;
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HStore *out;
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if (PG_ARGISNULL(0))
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PG_RETURN_NULL();
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key = PG_GETARG_TEXT_P(0);
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if (PG_ARGISNULL(1))
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len = CALCDATASIZE(1, VARSIZE(key));
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else
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{
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val = PG_GETARG_TEXT_P(1);
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len = CALCDATASIZE(1, VARSIZE(key) + VARSIZE(val) - 2 * VARHDRSZ);
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}
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out = palloc(len);
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SET_VARSIZE(out, len);
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out->size = 1;
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ARRPTR(out)->keylen = VARSIZE(key) - VARHDRSZ;
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if (PG_ARGISNULL(1))
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{
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ARRPTR(out)->vallen = 0;
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ARRPTR(out)->valisnull = true;
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}
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else
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{
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ARRPTR(out)->vallen = VARSIZE(val) - VARHDRSZ;
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ARRPTR(out)->valisnull = false;
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}
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ARRPTR(out)->pos = 0;
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memcpy(STRPTR(out), VARDATA(key), ARRPTR(out)->keylen);
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if (!PG_ARGISNULL(1))
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{
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memcpy(STRPTR(out) + ARRPTR(out)->keylen, VARDATA(val), ARRPTR(out)->vallen);
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PG_FREE_IF_COPY(val, 1);
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}
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PG_FREE_IF_COPY(key, 0);
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PG_RETURN_POINTER(out);
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}
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PG_FUNCTION_INFO_V1(akeys);
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Datum akeys(PG_FUNCTION_ARGS);
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Datum
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akeys(PG_FUNCTION_ARGS)
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{
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HStore *hs = PG_GETARG_HS(0);
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Datum *d;
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ArrayType *a;
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HEntry *ptr = ARRPTR(hs);
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char *base = STRPTR(hs);
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d = (Datum *) palloc(sizeof(Datum) * (hs->size + 1));
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while (ptr - ARRPTR(hs) < hs->size)
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{
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text *item;
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item = cstring_to_text_with_len(base + ptr->pos, ptr->keylen);
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d[ptr - ARRPTR(hs)] = PointerGetDatum(item);
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ptr++;
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}
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a = construct_array(d,
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hs->size,
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TEXTOID,
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-1,
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false,
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'i');
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ptr = ARRPTR(hs);
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while (ptr - ARRPTR(hs) < hs->size)
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{
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pfree(DatumGetPointer(d[ptr - ARRPTR(hs)]));
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ptr++;
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}
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pfree(d);
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PG_FREE_IF_COPY(hs, 0);
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PG_RETURN_POINTER(a);
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}
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PG_FUNCTION_INFO_V1(avals);
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Datum avals(PG_FUNCTION_ARGS);
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Datum
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avals(PG_FUNCTION_ARGS)
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{
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HStore *hs = PG_GETARG_HS(0);
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Datum *d;
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ArrayType *a;
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HEntry *ptr = ARRPTR(hs);
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char *base = STRPTR(hs);
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d = (Datum *) palloc(sizeof(Datum) * (hs->size + 1));
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while (ptr - ARRPTR(hs) < hs->size)
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{
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text *item;
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item = cstring_to_text_with_len(base + ptr->pos + ptr->keylen,
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(ptr->valisnull) ? 0 : ptr->vallen);
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d[ptr - ARRPTR(hs)] = PointerGetDatum(item);
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ptr++;
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}
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a = construct_array(d,
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hs->size,
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TEXTOID,
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-1,
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false,
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'i');
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ptr = ARRPTR(hs);
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while (ptr - ARRPTR(hs) < hs->size)
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{
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pfree(DatumGetPointer(d[ptr - ARRPTR(hs)]));
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ptr++;
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}
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pfree(d);
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PG_FREE_IF_COPY(hs, 0);
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PG_RETURN_POINTER(a);
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}
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typedef struct
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{
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HStore *hs;
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int i;
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} AKStore;
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static void
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setup_firstcall(FuncCallContext *funcctx, HStore * hs)
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{
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MemoryContext oldcontext;
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AKStore *st;
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oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
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st = (AKStore *) palloc(sizeof(AKStore));
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st->i = 0;
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st->hs = (HStore *) palloc(VARSIZE(hs));
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memcpy(st->hs, hs, VARSIZE(hs));
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funcctx->user_fctx = (void *) st;
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MemoryContextSwitchTo(oldcontext);
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}
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PG_FUNCTION_INFO_V1(skeys);
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Datum skeys(PG_FUNCTION_ARGS);
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Datum
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skeys(PG_FUNCTION_ARGS)
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{
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FuncCallContext *funcctx;
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AKStore *st;
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if (SRF_IS_FIRSTCALL())
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{
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HStore *hs = PG_GETARG_HS(0);
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funcctx = SRF_FIRSTCALL_INIT();
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setup_firstcall(funcctx, hs);
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PG_FREE_IF_COPY(hs, 0);
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}
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funcctx = SRF_PERCALL_SETUP();
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st = (AKStore *) funcctx->user_fctx;
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if (st->i < st->hs->size)
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{
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HEntry *ptr = &(ARRPTR(st->hs)[st->i]);
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text *item;
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item = cstring_to_text_with_len(STRPTR(st->hs) + ptr->pos,
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ptr->keylen);
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st->i++;
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SRF_RETURN_NEXT(funcctx, PointerGetDatum(item));
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}
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pfree(st->hs);
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pfree(st);
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SRF_RETURN_DONE(funcctx);
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}
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PG_FUNCTION_INFO_V1(svals);
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Datum svals(PG_FUNCTION_ARGS);
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Datum
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svals(PG_FUNCTION_ARGS)
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{
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FuncCallContext *funcctx;
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AKStore *st;
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if (SRF_IS_FIRSTCALL())
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{
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HStore *hs = PG_GETARG_HS(0);
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funcctx = SRF_FIRSTCALL_INIT();
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setup_firstcall(funcctx, hs);
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PG_FREE_IF_COPY(hs, 0);
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}
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funcctx = SRF_PERCALL_SETUP();
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st = (AKStore *) funcctx->user_fctx;
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if (st->i < st->hs->size)
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{
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HEntry *ptr = &(ARRPTR(st->hs)[st->i]);
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if (ptr->valisnull)
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{
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ReturnSetInfo *rsi;
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st->i++;
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(funcctx)->call_cntr++;
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rsi = (ReturnSetInfo *) fcinfo->resultinfo;
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rsi->isDone = ExprMultipleResult;
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PG_RETURN_NULL();
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}
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else
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{
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text *item;
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item = cstring_to_text_with_len(STRPTR(st->hs) + ptr->pos + ptr->keylen,
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ptr->vallen);
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st->i++;
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SRF_RETURN_NEXT(funcctx, PointerGetDatum(item));
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}
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}
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pfree(st->hs);
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pfree(st);
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SRF_RETURN_DONE(funcctx);
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}
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PG_FUNCTION_INFO_V1(hs_contains);
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Datum hs_contains(PG_FUNCTION_ARGS);
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Datum
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hs_contains(PG_FUNCTION_ARGS)
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{
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HStore *val = PG_GETARG_HS(0);
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HStore *tmpl = PG_GETARG_HS(1);
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bool res = true;
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HEntry *te = ARRPTR(tmpl);
|
|
char *vv = STRPTR(val);
|
|
char *tv = STRPTR(tmpl);
|
|
|
|
while (res && te - ARRPTR(tmpl) < tmpl->size)
|
|
{
|
|
HEntry *entry = findkey(val, tv + te->pos, te->keylen);
|
|
|
|
if (entry)
|
|
{
|
|
if (te->valisnull || entry->valisnull)
|
|
{
|
|
if (!(te->valisnull && entry->valisnull))
|
|
res = false;
|
|
}
|
|
else if (te->vallen != entry->vallen ||
|
|
strncmp(
|
|
vv + entry->pos + entry->keylen,
|
|
tv + te->pos + te->keylen,
|
|
te->vallen)
|
|
)
|
|
res = false;
|
|
}
|
|
else
|
|
res = false;
|
|
te++;
|
|
}
|
|
|
|
PG_FREE_IF_COPY(val, 0);
|
|
PG_FREE_IF_COPY(tmpl, 1);
|
|
|
|
PG_RETURN_BOOL(res);
|
|
}
|
|
|
|
PG_FUNCTION_INFO_V1(hs_contained);
|
|
Datum hs_contained(PG_FUNCTION_ARGS);
|
|
Datum
|
|
hs_contained(PG_FUNCTION_ARGS)
|
|
{
|
|
PG_RETURN_DATUM(DirectFunctionCall2(
|
|
hs_contains,
|
|
PG_GETARG_DATUM(1),
|
|
PG_GETARG_DATUM(0)
|
|
));
|
|
}
|
|
|
|
PG_FUNCTION_INFO_V1(each);
|
|
Datum each(PG_FUNCTION_ARGS);
|
|
Datum
|
|
each(PG_FUNCTION_ARGS)
|
|
{
|
|
FuncCallContext *funcctx;
|
|
AKStore *st;
|
|
|
|
if (SRF_IS_FIRSTCALL())
|
|
{
|
|
TupleDesc tupdesc;
|
|
MemoryContext oldcontext;
|
|
HStore *hs = PG_GETARG_HS(0);
|
|
|
|
funcctx = SRF_FIRSTCALL_INIT();
|
|
oldcontext = MemoryContextSwitchTo(funcctx->multi_call_memory_ctx);
|
|
st = (AKStore *) palloc(sizeof(AKStore));
|
|
st->i = 0;
|
|
st->hs = (HStore *) palloc(VARSIZE(hs));
|
|
memcpy(st->hs, hs, VARSIZE(hs));
|
|
funcctx->user_fctx = (void *) st;
|
|
|
|
/* Build a tuple descriptor for our result type */
|
|
if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE)
|
|
elog(ERROR, "return type must be a row type");
|
|
|
|
funcctx->attinmeta = TupleDescGetAttInMetadata(tupdesc);
|
|
|
|
MemoryContextSwitchTo(oldcontext);
|
|
PG_FREE_IF_COPY(hs, 0);
|
|
}
|
|
|
|
funcctx = SRF_PERCALL_SETUP();
|
|
st = (AKStore *) funcctx->user_fctx;
|
|
|
|
if (st->i < st->hs->size)
|
|
{
|
|
HEntry *ptr = &(ARRPTR(st->hs)[st->i]);
|
|
Datum res,
|
|
dvalues[2];
|
|
char nulls[] = {' ', ' '};
|
|
text *item;
|
|
HeapTuple tuple;
|
|
|
|
item = cstring_to_text_with_len(STRPTR(st->hs) + ptr->pos, ptr->keylen);
|
|
dvalues[0] = PointerGetDatum(item);
|
|
|
|
if (ptr->valisnull)
|
|
{
|
|
dvalues[1] = (Datum) 0;
|
|
nulls[1] = 'n';
|
|
}
|
|
else
|
|
{
|
|
item = cstring_to_text_with_len(STRPTR(st->hs) + ptr->pos + ptr->keylen,
|
|
ptr->vallen);
|
|
dvalues[1] = PointerGetDatum(item);
|
|
}
|
|
st->i++;
|
|
|
|
tuple = heap_formtuple(funcctx->attinmeta->tupdesc, dvalues, nulls);
|
|
res = HeapTupleGetDatum(tuple);
|
|
|
|
pfree(DatumGetPointer(dvalues[0]));
|
|
if (nulls[1] != 'n')
|
|
pfree(DatumGetPointer(dvalues[1]));
|
|
|
|
SRF_RETURN_NEXT(funcctx, PointerGetDatum(res));
|
|
}
|
|
|
|
pfree(st->hs);
|
|
pfree(st);
|
|
|
|
SRF_RETURN_DONE(funcctx);
|
|
}
|