1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2015 University of Waterloo |
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3 | // |
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4 | // The contents of this file are covered under the licence agreement in the |
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5 | // file "LICENCE" distributed with Cforall. |
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6 | // |
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7 | // Tuples.h -- |
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8 | // |
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9 | // Author : Andrew Beach |
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10 | // Created On : Mon Jun 17 14:41:00 2019 |
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11 | // Last Modified By : Andrew Beach |
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12 | // Last Modified On : Wed Jun 12 15:43:00 2019 |
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13 | // Update Count : 0 |
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14 | // |
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15 | |
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16 | #include "Tuples.h" |
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17 | |
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18 | #include "AST/Pass.hpp" |
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19 | #include "AST/LinkageSpec.hpp" |
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20 | #include "InitTweak/InitTweak.h" |
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21 | |
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22 | namespace Tuples { |
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23 | |
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24 | namespace { |
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25 | /// Determines if impurity (read: side-effects) may exist in a piece of code. Currently gives |
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26 | /// a very crude approximation, wherein any function call expression means the code may be |
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27 | /// impure. |
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28 | struct ImpurityDetector : public ast::WithShortCircuiting { |
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29 | ImpurityDetector( bool ignoreUnique ) : ignoreUnique( ignoreUnique ) {} |
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30 | bool maybeImpure = false; |
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31 | bool ignoreUnique; |
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32 | |
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33 | void previsit( ast::ApplicationExpr const * appExpr ) { |
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34 | visit_children = false; |
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35 | if ( ast::DeclWithType const * function = InitTweak::getFunction( appExpr ) ) { |
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36 | if ( function->linkage == ast::Linkage::Intrinsic |
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37 | && ( function->name == "*?" || function->name == "?[?]" ) ) { |
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38 | visit_children = true; |
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39 | return; |
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40 | } |
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41 | } |
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42 | maybeImpure = true; |
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43 | } |
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44 | void previsit( ast::UntypedExpr const * ) { |
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45 | maybeImpure = true; visit_children = false; |
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46 | } |
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47 | void previsit( ast::UniqueExpr const * ) { |
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48 | if ( ignoreUnique ) { |
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49 | visit_children = false; |
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50 | } |
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51 | } |
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52 | }; |
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53 | |
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54 | bool detectImpurity( const ast::Expr * expr, bool ignoreUnique ) { |
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55 | ast::Pass<ImpurityDetector> detector( ignoreUnique ); |
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56 | expr->accept( detector ); |
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57 | return detector.pass.maybeImpure; |
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58 | } |
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59 | } // namespace |
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60 | |
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61 | bool maybeImpureIgnoreUnique( const ast::Expr * expr ) { |
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62 | return detectImpurity( expr, true ); |
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63 | } |
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64 | |
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65 | } // namespace Tuples |
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66 | |
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67 | // Local Variables: // |
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68 | // tab-width: 4 // |
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69 | // mode: c++ // |
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70 | // compile-command: "make install" // |
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71 | // End: // |
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