source: src/Tuples/Tuples.cc @ 2a3d446

ADTarm-ehast-experimentalenumforall-pointer-decayjacob/cs343-translationnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change on this file since 2a3d446 was bc92bee, checked in by Andrew Beach <ajbeach@…>, 5 years ago

Implemented Tuples::maybeImpure while it was fresh in my mind.

  • Property mode set to 100644
File size: 1.9 KB
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1//
2// Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo
3//
4// The contents of this file are covered under the licence agreement in the
5// file "LICENCE" distributed with Cforall.
6//
7// Tuples.h --
8//
9// Author           : Andrew Beach
10// Created On       : Mon Jun 17 14:41:00 2019
11// Last Modified By : Andrew Beach
12// Last Modified On : Tue Jun 18  9:31:00 2019
13// Update Count     : 1
14//
15
16#include "Tuples.h"
17
18#include "AST/Pass.hpp"
19#include "AST/LinkageSpec.hpp"
20#include "InitTweak/InitTweak.h"
21
22namespace Tuples {
23
24namespace {
25        /// Determines if impurity (read: side-effects) may exist in a piece of code. Currently gives
26        /// a very crude approximation, wherein any function call expression means the code may be
27        /// impure.
28    struct ImpurityDetector : public ast::WithShortCircuiting {
29                bool maybeImpure = false;
30
31                void previsit( ast::ApplicationExpr const * appExpr ) {
32                        if ( ast::DeclWithType const * function = InitTweak::getFunction( appExpr ) ) {
33                                if ( function->linkage == ast::Linkage::Intrinsic
34                                                && ( function->name == "*?" || function->name == "?[?]" ) ) {
35                                        return;
36                                }
37                        }
38                        maybeImpure = true; visit_children = false;
39                }
40                void previsit( ast::UntypedExpr const * ) {
41                        maybeImpure = true; visit_children = false;
42                }
43        };
44        struct ImpurityDetectorIgnoreUnique : public ImpurityDetector {
45                void previsit( ast::UniqueExpr const * ) {
46                        visit_children = false;
47                }
48        };
49
50        template<typename Detector>
51        bool detectImpurity( const ast::Expr * expr ) {
52                ast::Pass<Detector> detector;
53                expr->accept( detector );
54                return detector.pass.maybeImpure;
55        }
56} // namespace
57
58bool maybeImpure( const ast::Expr * expr ) {
59        return detectImpurity<ImpurityDetector>( expr );
60}
61
62bool maybeImpureIgnoreUnique( const ast::Expr * expr ) {
63        return detectImpurity<ImpurityDetectorIgnoreUnique>( expr );
64}
65
66} // namespace Tuples
67
68// Local Variables: //
69// tab-width: 4 //
70// mode: c++ //
71// compile-command: "make install" //
72// End: //
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