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annotate libinterp/parse-tree/pt-vm-eval.cc @ 31167:92d897a2c1c3

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New runtime function __enable_vm_eval__() to control use of VM evaluator. * libinterp/parse-tree/pt-vm-eval.cc (F__enable_vm_eval__): New file. New DEFUN for __enable_vm_eval__ protected by #ifdef on configuration variable OCTAVE_ENABLE_VM_EVALUATOR. * libinterp/parse-tree/module.mk: Add pt-vm-eval.cc to build system.
author Rik <rik@octave.org>
date Fri, 29 Jul 2022 10:41:22 -0700
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children e88a07dec498
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31167
92d897a2c1c3 New runtime function __enable_vm_eval__() to control use of VM evaluator.
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1 ////////////////////////////////////////////////////////////////////////
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2 //
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3 // Copyright (C) 2022 The Octave Project Developers
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4 //
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5 // See the file COPYRIGHT.md in the top-level directory of this
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6 // distribution or <https://octave.org/copyright/>.
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7 //
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8 // This file is part of Octave.
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9 //
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10 // Octave is free software: you can redistribute it and/or modify it
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11 // under the terms of the GNU General Public License as published by
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12 // the Free Software Foundation, either version 3 of the License, or
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13 // (at your option) any later version.
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14 //
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15 // Octave is distributed in the hope that it will be useful, but
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16 // WITHOUT ANY WARRANTY; without even the implied warranty of
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17 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 // GNU General Public License for more details.
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19 //
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20 // You should have received a copy of the GNU General Public License
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21 // along with Octave; see the file COPYING. If not, see
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22 // <https://www.gnu.org/licenses/>.
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23 //
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24 ////////////////////////////////////////////////////////////////////////
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25
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26 #if defined (HAVE_CONFIG_H)
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27 # include "config.h"
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28 #endif
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29
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30 #include "defun.h"
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31 #include "variables.h"
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32
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33 OCTAVE_NAMESPACE_BEGIN
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34
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35 // If TRUE, use VM evaluator rather than tree walker.
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36
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37 static bool V__enable_vm_eval__ = false;
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38
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39 DEFUN (__enable_vm_eval__, args, nargout,
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40 doc: /* -*- texinfo -*-
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41 @deftypefn {} {@var{val} =} __enable_vm_eval__ ()
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42 @deftypefnx {} {@var{old_val} =} __enable_vm_eval__ (@var{new_val})
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43 @deftypefnx {} {@var{old_val} =} __enable_vm_eval__ (@var{new_val}, "local")
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44 Query or set whether Octave uses a virtual machine (VM) for evaluation of
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45 parsed statements.
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46
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47 The default value is false. When false, Octave uses a traditional tree walker
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48 to evaluate statements parsed from m-code. When true, Octave translates parsed
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49 statements to an intermediate representation that is then evaluated by a
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50 virtual machine.
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51
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52 When called from inside a function with the @qcode{"local"} option, the setting
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53 is changed locally for the function and any subroutines it calls. The original
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54 setting is restored when exiting the function.
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55 @end deftypefn */)
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56 {
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57 #if defined (OCTAVE_ENABLE_VM_EVALUATOR)
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58
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59 return set_internal_variable (V__enable_vm_eval__, args, nargout,
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60 "__enable_vm_eval__");
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61
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62 #else
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63
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64 octave_unused_parameter (args);
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65
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66 err_disabled_feature ("vm-evaluator",
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67 "using a Virtual Machine for statement evaluation");
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68
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69 #endif
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70 }
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71
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72 OCTAVE_NAMESPACE_END