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354 lines
7.5 KiB
354 lines
7.5 KiB
/******************************************************
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SQL parser symbol table
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(c) 1997 Innobase Oy
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Created 12/15/1997 Heikki Tuuri
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*******************************************************/
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#include "pars0sym.h"
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#ifdef UNIV_NONINL
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#include "pars0sym.ic"
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#endif
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#include "mem0mem.h"
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#include "data0type.h"
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#include "data0data.h"
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#include "pars0grm.h"
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#include "pars0pars.h"
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#include "que0que.h"
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#include "eval0eval.h"
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#include "row0sel.h"
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/**********************************************************************
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Creates a symbol table for a single stored procedure or query. */
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UNIV_INTERN
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sym_tab_t*
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sym_tab_create(
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/*===========*/
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/* out, own: symbol table */
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mem_heap_t* heap) /* in: memory heap where to create */
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{
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sym_tab_t* sym_tab;
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sym_tab = mem_heap_alloc(heap, sizeof(sym_tab_t));
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UT_LIST_INIT(sym_tab->sym_list);
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UT_LIST_INIT(sym_tab->func_node_list);
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sym_tab->heap = heap;
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return(sym_tab);
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}
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/**********************************************************************
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Frees the memory allocated dynamically AFTER parsing phase for variables
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etc. in the symbol table. Does not free the mem heap where the table was
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originally created. Frees also SQL explicit cursor definitions. */
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UNIV_INTERN
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void
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sym_tab_free_private(
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/*=================*/
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sym_tab_t* sym_tab) /* in, own: symbol table */
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{
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sym_node_t* sym;
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func_node_t* func;
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sym = UT_LIST_GET_FIRST(sym_tab->sym_list);
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while (sym) {
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eval_node_free_val_buf(sym);
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if (sym->prefetch_buf) {
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sel_col_prefetch_buf_free(sym->prefetch_buf);
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}
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if (sym->cursor_def) {
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que_graph_free_recursive(sym->cursor_def);
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}
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sym = UT_LIST_GET_NEXT(sym_list, sym);
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}
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func = UT_LIST_GET_FIRST(sym_tab->func_node_list);
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while (func) {
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eval_node_free_val_buf(func);
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func = UT_LIST_GET_NEXT(func_node_list, func);
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}
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}
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/**********************************************************************
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Adds an integer literal to a symbol table. */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_int_lit(
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/*================*/
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/* out: symbol table node */
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sym_tab_t* sym_tab, /* in: symbol table */
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ulint val) /* in: integer value */
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{
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sym_node_t* node;
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byte* data;
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node = mem_heap_alloc(sym_tab->heap, sizeof(sym_node_t));
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node->common.type = QUE_NODE_SYMBOL;
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node->resolved = TRUE;
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node->token_type = SYM_LIT;
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node->indirection = NULL;
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dtype_set(dfield_get_type(&node->common.val), DATA_INT, 0, 4);
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data = mem_heap_alloc(sym_tab->heap, 4);
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mach_write_to_4(data, val);
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dfield_set_data(&(node->common.val), data, 4);
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node->common.val_buf_size = 0;
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node->prefetch_buf = NULL;
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node->cursor_def = NULL;
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UT_LIST_ADD_LAST(sym_list, sym_tab->sym_list, node);
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node->sym_table = sym_tab;
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return(node);
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}
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/**********************************************************************
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Adds a string literal to a symbol table. */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_str_lit(
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/*================*/
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/* out: symbol table node */
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sym_tab_t* sym_tab, /* in: symbol table */
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byte* str, /* in: string with no quotes around
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it */
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ulint len) /* in: string length */
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{
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sym_node_t* node;
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byte* data;
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node = mem_heap_alloc(sym_tab->heap, sizeof(sym_node_t));
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node->common.type = QUE_NODE_SYMBOL;
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node->resolved = TRUE;
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node->token_type = SYM_LIT;
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node->indirection = NULL;
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dtype_set(dfield_get_type(&node->common.val),
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DATA_VARCHAR, DATA_ENGLISH, 0);
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if (len) {
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data = mem_heap_alloc(sym_tab->heap, len);
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ut_memcpy(data, str, len);
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} else {
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data = NULL;
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}
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dfield_set_data(&(node->common.val), data, len);
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node->common.val_buf_size = 0;
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node->prefetch_buf = NULL;
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node->cursor_def = NULL;
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UT_LIST_ADD_LAST(sym_list, sym_tab->sym_list, node);
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node->sym_table = sym_tab;
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return(node);
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}
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/**********************************************************************
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Add a bound literal to a symbol table. */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_bound_lit(
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/*==================*/
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/* out: symbol table node */
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sym_tab_t* sym_tab, /* in: symbol table */
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const char* name, /* in: name of bound literal */
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ulint* lit_type) /* out: type of literal (PARS_*_LIT) */
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{
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sym_node_t* node;
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pars_bound_lit_t* blit;
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ulint len = 0;
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blit = pars_info_get_bound_lit(sym_tab->info, name);
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ut_a(blit);
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node = mem_heap_alloc(sym_tab->heap, sizeof(sym_node_t));
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node->common.type = QUE_NODE_SYMBOL;
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node->resolved = TRUE;
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node->token_type = SYM_LIT;
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node->indirection = NULL;
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switch (blit->type) {
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case DATA_FIXBINARY:
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len = blit->length;
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*lit_type = PARS_FIXBINARY_LIT;
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break;
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case DATA_BLOB:
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*lit_type = PARS_BLOB_LIT;
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break;
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case DATA_VARCHAR:
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*lit_type = PARS_STR_LIT;
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break;
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case DATA_CHAR:
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ut_a(blit->length > 0);
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len = blit->length;
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*lit_type = PARS_STR_LIT;
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break;
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case DATA_INT:
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ut_a(blit->length > 0);
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ut_a(blit->length <= 8);
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len = blit->length;
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*lit_type = PARS_INT_LIT;
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break;
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default:
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ut_error;
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}
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dtype_set(dfield_get_type(&node->common.val),
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blit->type, blit->prtype, len);
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dfield_set_data(&(node->common.val), blit->address, blit->length);
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node->common.val_buf_size = 0;
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node->prefetch_buf = NULL;
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node->cursor_def = NULL;
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UT_LIST_ADD_LAST(sym_list, sym_tab->sym_list, node);
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node->sym_table = sym_tab;
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return(node);
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}
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/**********************************************************************
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Adds an SQL null literal to a symbol table. */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_null_lit(
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/*=================*/
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/* out: symbol table node */
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sym_tab_t* sym_tab) /* in: symbol table */
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{
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sym_node_t* node;
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node = mem_heap_alloc(sym_tab->heap, sizeof(sym_node_t));
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node->common.type = QUE_NODE_SYMBOL;
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node->resolved = TRUE;
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node->token_type = SYM_LIT;
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node->indirection = NULL;
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dfield_get_type(&node->common.val)->mtype = DATA_ERROR;
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dfield_set_null(&node->common.val);
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node->common.val_buf_size = 0;
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node->prefetch_buf = NULL;
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node->cursor_def = NULL;
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UT_LIST_ADD_LAST(sym_list, sym_tab->sym_list, node);
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node->sym_table = sym_tab;
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return(node);
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}
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/**********************************************************************
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Adds an identifier to a symbol table. */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_id(
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/*===========*/
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/* out: symbol table node */
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sym_tab_t* sym_tab, /* in: symbol table */
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byte* name, /* in: identifier name */
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ulint len) /* in: identifier length */
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{
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sym_node_t* node;
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node = mem_heap_alloc(sym_tab->heap, sizeof(sym_node_t));
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node->common.type = QUE_NODE_SYMBOL;
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node->resolved = FALSE;
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node->indirection = NULL;
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node->name = mem_heap_strdupl(sym_tab->heap, (char*) name, len);
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node->name_len = len;
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UT_LIST_ADD_LAST(sym_list, sym_tab->sym_list, node);
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dfield_set_null(&node->common.val);
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node->common.val_buf_size = 0;
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node->prefetch_buf = NULL;
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node->cursor_def = NULL;
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node->sym_table = sym_tab;
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return(node);
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}
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/**********************************************************************
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Add a bound identifier to a symbol table. */
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UNIV_INTERN
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sym_node_t*
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sym_tab_add_bound_id(
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/*===========*/
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/* out: symbol table node */
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sym_tab_t* sym_tab, /* in: symbol table */
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const char* name) /* in: name of bound id */
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{
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sym_node_t* node;
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pars_bound_id_t* bid;
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bid = pars_info_get_bound_id(sym_tab->info, name);
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ut_a(bid);
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node = mem_heap_alloc(sym_tab->heap, sizeof(sym_node_t));
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node->common.type = QUE_NODE_SYMBOL;
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node->resolved = FALSE;
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node->indirection = NULL;
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node->name = mem_heap_strdup(sym_tab->heap, bid->id);
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node->name_len = strlen(node->name);
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UT_LIST_ADD_LAST(sym_list, sym_tab->sym_list, node);
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dfield_set_null(&node->common.val);
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node->common.val_buf_size = 0;
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node->prefetch_buf = NULL;
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node->cursor_def = NULL;
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node->sym_table = sym_tab;
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return(node);
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}
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