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 | // PtrsAssignable.cc -- |
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8 | // |
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9 | // Author : Richard C. Bilson |
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10 | // Created On : Sun May 17 11:44:11 2015 |
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11 | // Last Modified By : Andrew |
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12 | // Last Modified On : Mon Jun 24 15:29:00 2019 |
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13 | // Update Count : 9 |
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14 | // |
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15 | |
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16 | #include "PtrsAssignable.hpp" |
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17 | |
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18 | #include "AST/Pass.hpp" |
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19 | #include "AST/Type.hpp" |
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20 | #include "AST/TypeEnvironment.hpp" |
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21 | |
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22 | namespace ResolvExpr { |
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23 | |
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24 | struct PtrsAssignable : public ast::WithShortCircuiting { |
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25 | const ast::Type * dst; |
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26 | const ast::TypeEnvironment & typeEnv; |
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27 | int result; |
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28 | |
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29 | PtrsAssignable( const ast::Type * dst, const ast::TypeEnvironment & env ) : |
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30 | dst( dst ), typeEnv( env ), result( 0 ) {} |
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31 | |
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32 | void previsit( ast::Type * ) { visit_children = false; } |
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33 | |
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34 | void postvisit( const ast::EnumInstType * ) { |
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35 | if ( dynamic_cast< const ast::BasicType * >( dst ) ) { |
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36 | // int * = E *, etc. is safe. This isn't technically correct, as each |
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37 | // enum has one basic type that it is compatible with, an that type can |
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38 | // differ from enum to enum. Without replicating GCC's internal logic, |
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39 | // there is no way to know which type this particular enum is compatible |
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40 | // with, so punt on this for now. |
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41 | result = 1; |
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42 | } |
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43 | } |
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44 | void postvisit( const ast::TypeInstType * inst ) { |
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45 | if ( const ast::EqvClass * eqv = typeEnv.lookup( *inst ) ) { |
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46 | if ( eqv->bound ) { |
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47 | // T * = S * for any S depends on the type bound to T |
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48 | result = ptrsAssignable( eqv->bound, dst, typeEnv ); |
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49 | } |
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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 | int ptrsAssignable( const ast::Type * src, const ast::Type * dst, |
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55 | const ast::TypeEnvironment & env ) { |
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56 | if ( const ast::TypeInstType * dstAsInst = dynamic_cast< const ast::TypeInstType * >( dst ) ) { |
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57 | if ( const ast::EqvClass * eqv = env.lookup( *dstAsInst ) ) { |
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58 | return ptrsAssignable( src, eqv->bound, env ); |
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59 | } |
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60 | } |
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61 | if ( dynamic_cast< const ast::VoidType * >( dst ) ) { |
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62 | return -1; |
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63 | } else { |
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64 | ast::Pass<PtrsAssignable> visitor( dst, env ); |
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65 | src->accept( visitor ); |
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66 | return visitor.core.result; |
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67 | } |
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68 | |
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69 | // see ticket #136 (this should be able to replace the visitor). |
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70 | #if 0 |
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71 | if ( const ast::TypeInstType * dstAsTypeInst = |
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72 | dynamic_cast< const ast::TypeInstType* >( dst ) ) { |
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73 | if ( const ast::EqvClass * eqv = env.lookup( dstAsTypeInst->get_name() ) ) { |
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74 | return ptrsAssignable( src, eqv->type, env ); |
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75 | } // if |
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76 | } // if |
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77 | if ( dynamic_cast< VoidType* >( dst ) ) { |
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78 | // void * = T * for any T is unsafe |
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79 | // xxx - this should be safe, but that currently breaks the build |
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80 | return -1; |
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81 | } else if ( dynamic_cast< EnumInstType * >( src ) ) { |
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82 | if ( dynamic_cast< BasicType * >( dst ) ) { |
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83 | // int * = E *, etc. is safe. This isn't technically correct, as each |
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84 | // enum has one basic type that it is compatible with, an that type can |
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85 | // differ from enum to enum. Without replicating GCC's internal logic, |
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86 | // there is no way to know which type this particular enum is compatible |
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87 | // with, so punt on this for now. |
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88 | return 1; |
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89 | } |
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90 | } else if ( const ast::TypeInstType * typeInstType = |
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91 | dynamic_cast< const ast::TypeInstType * >( src ) ) { |
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92 | if ( const ast::EqvClass * eqv = env.lookup( typeInstType->name ) ) { |
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93 | if ( eqv->bound ) { |
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94 | // T * = S * for any S depends on the type bound to T |
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95 | return ptrsAssignable( eqv->bound, dst, env ); |
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96 | } |
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97 | } |
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98 | } |
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99 | return 0; |
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100 | #endif |
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101 | } |
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102 | |
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103 | } // namespace ResolvExpr |
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104 | |
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105 | // Local Variables: // |
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106 | // tab-width: 4 // |
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107 | // mode: c++ // |
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108 | // compile-command: "make install" // |
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109 | // End: // |
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