1 | // |
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2 | // Cforall Version 1.0.0 Copyright (C) 2016 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 | // Tables.cc -- |
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8 | // |
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9 | // Author : Andrew Beach |
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10 | // Created On : Mon Aug 31 11:11:00 2020 |
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11 | // Last Modified By : Andrew Beach |
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12 | // Last Modified On : Tue Sep 3 14:56:00 2020 |
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13 | // Update Count : 0 |
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14 | // |
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15 | |
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16 | #include <SynTree/Declaration.h> |
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17 | #include <SynTree/Expression.h> |
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18 | #include <SynTree/Type.h> |
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19 | |
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20 | namespace Virtual { |
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21 | |
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22 | std::string vtableTypeName( std::string const & name ) { |
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23 | return name + "_vtable"; |
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24 | } |
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25 | |
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26 | std::string instanceName( std::string const & name ) { |
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27 | return std::string("_") + name + "_instance"; |
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28 | } |
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29 | |
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30 | std::string vtableInstanceName( std::string const & name ) { |
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31 | return instanceName( vtableTypeName( name ) ); |
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32 | } |
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33 | |
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34 | bool isVTableInstanceName( std::string const & name ) { |
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35 | // There are some delicate length calculations here. |
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36 | return 17 < name.size() && '_' == name[0] && |
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37 | std::string("_vtable_instance") == name.substr(1, name.size() - 17); |
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38 | } |
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39 | |
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40 | // Fuse base polymorphic declaration and forall arguments into a new type. |
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41 | static StructInstType * vtableInstType( |
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42 | StructDecl * polyDecl, std::list< Expression * > && parameters ) { |
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43 | assert( parameters.size() == polyDecl->parameters.size() ); |
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44 | StructInstType * type = new StructInstType( |
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45 | Type::Qualifiers( /* Type::Const */ ), polyDecl ); |
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46 | type->parameters = std::move( parameters ); |
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47 | return type; |
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48 | } |
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49 | |
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50 | static ObjectDecl * makeVtableDeclaration( |
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51 | StructInstType * type, Initializer * init ) { |
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52 | std::string const & name = instanceName( type->name ); |
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53 | Type::StorageClasses storage = noStorageClasses; |
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54 | if ( nullptr == init ) { |
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55 | storage.is_extern = true; |
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56 | } |
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57 | return new ObjectDecl( |
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58 | name, |
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59 | storage, |
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60 | LinkageSpec::Cforall, |
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61 | nullptr, |
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62 | type, |
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63 | init |
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64 | ); |
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65 | } |
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66 | |
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67 | ObjectDecl * makeVtableForward( StructInstType * type ) { |
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68 | return makeVtableDeclaration( type, nullptr ); |
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69 | } |
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70 | |
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71 | ObjectDecl * makeVtableForward( |
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72 | StructDecl * polyDecl, std::list< Expression * > && parameters ) { |
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73 | return makeVtableForward( vtableInstType( polyDecl, std::move( parameters ) ) ); |
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74 | } |
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75 | |
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76 | ObjectDecl * makeVtableInstance( |
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77 | StructInstType * vtableType, Type * vobject_type, Initializer * init ) { |
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78 | StructDecl * vtableStruct = vtableType->baseStruct; |
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79 | // Build the initialization |
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80 | if ( nullptr == init ) { |
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81 | std::list< Initializer * > inits; |
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82 | |
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83 | // This is going to have to be run before the resolver to connect expressions. |
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84 | for ( auto field : vtableStruct->members ) { |
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85 | if ( std::string( "parent" ) == field->name ) { |
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86 | // This will not work with polymorphic state. |
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87 | auto oField = strict_dynamic_cast< ObjectDecl * >( field ); |
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88 | auto fieldType = strict_dynamic_cast< PointerType * >( oField->type ); |
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89 | auto parentType = strict_dynamic_cast< StructInstType * >( fieldType->base ); |
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90 | std::string const & parentInstance = instanceName( parentType->name ); |
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91 | inits.push_back( |
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92 | new SingleInit( new AddressExpr( new NameExpr( parentInstance ) ) ) ); |
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93 | } else if ( std::string( "size" ) == field->name ) { |
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94 | inits.push_back( new SingleInit( new SizeofExpr( vobject_type->clone() ) ) ); |
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95 | } else if ( std::string( "align" ) == field->name ) { |
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96 | inits.push_back( new SingleInit( new AlignofExpr( vobject_type->clone() ) ) ); |
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97 | } else { |
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98 | inits.push_back( new SingleInit( new NameExpr( field->name ) ) ); |
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99 | } |
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100 | } |
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101 | init = new ListInit( inits ); |
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102 | // This should initialize everything except the parent pointer, the |
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103 | // size-of and align-of fields. These should be inserted. |
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104 | } else { |
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105 | assert(false); |
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106 | } |
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107 | return makeVtableDeclaration( vtableType, init ); |
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108 | } |
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109 | |
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110 | ObjectDecl * makeVtableInstance( |
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111 | StructDecl * polyDecl, std::list< Expression * > && parameters, |
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112 | Type * vobject, Initializer * init ) { |
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113 | return makeVtableInstance( |
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114 | vtableInstType( polyDecl, std::move( parameters ) ), vobject, init ); |
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115 | } |
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116 | |
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117 | } |
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