Line data    Source code

       1             : /*
       2             :  * SPDX-License-Identifier: MPL-2.0
       3             :  *
       4             :  * This Source Code Form is subject to the terms of the Mozilla Public
       5             :  * License, v. 2.0.  If a copy of the MPL was not distributed with this
       6             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       7             :  *
       8             :  * Copyright 2024 MonetDB Foundation;
       9             :  * Copyright August 2008 - 2023 MonetDB B.V.;
      10             :  * Copyright 1997 - July 2008 CWI.
      11             :  */
      12             : 
      13             : /*
      14             :  *  Martin Kersten
      15             :  * Language Extensions
      16             :  * Iterators over scalar ranges are often needed, also at the MAL level.
      17             :  * The barrier and control primitives are sufficient to mimic them directly.
      18             :  *
      19             :  * The modules located in the kernel directory should not
      20             :  * rely on the MAL datastructures. That's why we have to deal with
      21             :  * some bat operations here and delegate the signature to the
      22             :  * proper module upon loading.
      23             :  *
      24             :  * Running a script is typically used to initialize a context.
      25             :  * Therefore we need access to the runtime context.
      26             :  * For the call variants we have
      27             :  * to determine an easy way to exchange the parameter/return values.
      28             :  */
      29             : 
      30             : #include "monetdb_config.h"
      31             : #include "mal.h"
      32             : #include "mal_module.h"
      33             : #include "mal_session.h"
      34             : #include "mal_resolve.h"
      35             : #include "mal_client.h"
      36             : #include "mal_interpreter.h"
      37             : #include "mal_dataflow.h"
      38             : 
      39             : static str
      40      145270 : MALstartDataflow(Client cntxt, MalBlkPtr mb, MalStkPtr stk, InstrPtr pci)
      41             : {
      42      145270 :         bit *ret = getArgReference_bit(stk, pci, 0);
      43      145270 :         int pc = getPC(mb, pci);
      44             : 
      45      145270 :         if (pc < 0 || pc > pci->jump)
      46           0 :                 throw(MAL, "language.dataflow", "Illegal statement range");
      47      145270 :         *ret = 0;                                       /* continue at end of block */
      48      145270 :         return runMALdataflow(cntxt, mb, pc, pci->jump, stk);
      49             : }
      50             : 
      51             : static str
      52     1585443 : MALpass(Client cntxt, MalBlkPtr mb, MalStkPtr stk, InstrPtr pci)
      53             : {
      54     1585443 :         (void) cntxt;
      55     1585443 :         (void) mb;
      56     1585443 :         (void) stk;
      57     1585443 :         (void) pci;
      58     1585443 :         return MAL_SUCCEED;
      59             : }
      60             : 
      61             : #include "mel.h"
      62             : mel_func language_init_funcs[] = {
      63             :  pattern("language", "dataflow", MALstartDataflow, false, "The current guarded block is executed using dataflow control. ", args(1,1, arg("",bit))),
      64             :  pattern("language", "pass", MALpass, false, "Cheap instruction to discard storage while retaining the dataflow dependency", args(0,1, argany("v",1))),
      65             :  pattern("language", "block", deblockdataflow, false, "Block on availability of all variables w, and then pass on v", args(1,3, arg("",int),arg("v",int),varargany("w",0))),
      66             :  { .imp=NULL }
      67             : };
      68             : #include "mal_import.h"
      69             : #ifdef _MSC_VER
      70             : #undef read
      71             : #pragma section(".CRT$XCU",read)
      72             : #endif
      73         321 : LIB_STARTUP_FUNC(init_language_mal)
      74         321 : { mal_module("language", NULL, language_init_funcs); }