[79f7875] | 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 | // Expr.hpp -- |
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| 8 | // |
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| 9 | // Author : Aaron B. Moss |
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| 10 | // Created On : Fri May 10 10:30:00 2019 |
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| 11 | // Last Modified By : Aaron B. Moss |
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| 12 | // Created On : Fri May 10 10:30:00 2019 |
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| 13 | // Update Count : 1 |
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| 14 | // |
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| 15 | |
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| 16 | #pragma once |
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| 17 | |
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| 18 | #include <cassert> |
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| 19 | #include <map> |
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| 20 | #include <utility> // for move |
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| 21 | #include <vector> |
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| 22 | |
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| 23 | #include "Fwd.hpp" // for UniqueId |
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| 24 | #include "ParseNode.hpp" |
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| 25 | #include "Type.hpp" // for ptr<Type> |
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| 26 | |
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| 27 | namespace ast { |
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| 28 | |
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| 29 | /// Contains the ID of a declaration and a type that is derived from that declaration, |
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| 30 | /// but subject to decay-to-pointer and type parameter renaming |
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| 31 | struct ParamEntry { |
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| 32 | UniqueId decl; |
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| 33 | ptr<Type> actualType; |
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| 34 | ptr<Type> formalType; |
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| 35 | ptr<Expr> expr; |
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| 36 | |
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| 37 | ParamEntry() : decl( 0 ), actualType( nullptr ), formalType( nullptr ), expr( nullptr ) {} |
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| 38 | ParamEntry( UniqueId id, Type* actual, Type* formal, Expr* e ) |
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| 39 | : decl( id ), actualType( actual ), formalType( formal ), expr( e ) {} |
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| 40 | }; |
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| 41 | |
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| 42 | /// Pre-resolution list of parameters to infer |
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| 43 | using ResnSlots = std::vector<UniqueId>; |
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| 44 | /// Post-resolution map of inferred parameters |
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| 45 | using InferredParams = std::map< UniqueId, ParamEntry >; |
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| 46 | |
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| 47 | /// Base node for expressions |
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| 48 | class Expr : public ParseNode { |
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| 49 | public: |
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| 50 | /// Saves space (~16 bytes) by combining ResnSlots and InferredParams |
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| 51 | struct InferUnion { |
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| 52 | enum { Empty, Slots, Params } mode; |
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| 53 | union data_t { |
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| 54 | char def; |
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| 55 | ResnSlots resnSlots; |
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| 56 | InferredParams inferParams; |
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| 57 | |
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| 58 | data_t() : def('\0') {} |
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| 59 | ~data_t() {} |
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| 60 | } data; |
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| 61 | |
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| 62 | /// initializes from other InferUnion |
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| 63 | void init_from( const InferUnion& o ) { |
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| 64 | switch ( o.mode ) { |
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| 65 | case Empty: return; |
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| 66 | case Slots: new(&data.resnSlots) ResnSlots{ o.data.resnSlots }; return; |
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| 67 | case Params: new(&data.inferParams) InferredParams{ o.data.inferParams }; return; |
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| 68 | } |
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| 69 | } |
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| 70 | |
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| 71 | /// initializes from other InferUnion (move semantics) |
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| 72 | void init_from( InferUnion&& o ) { |
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| 73 | switch ( o.mode ) { |
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| 74 | case Empty: return; |
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| 75 | case Slots: new(&data.resnSlots) ResnSlots{ std::move(o.data.resnSlots) }; return; |
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| 76 | case Params: |
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| 77 | new(&data.inferParams) InferredParams{ std::move(o.data.inferParams) }; return; |
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| 78 | } |
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| 79 | } |
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| 80 | |
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| 81 | /// clears variant fields |
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| 82 | void reset() { |
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| 83 | switch( mode ) { |
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| 84 | case Empty: return; |
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| 85 | case Slots: data.resnSlots.~ResnSlots(); return; |
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| 86 | case Params: data.inferParams.~InferredParams(); return; |
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| 87 | } |
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| 88 | } |
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| 89 | |
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| 90 | InferUnion() : mode(Empty), data() {} |
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| 91 | InferUnion( const InferUnion& o ) : mode( o.mode ), data() { init_from( o ); } |
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| 92 | InferUnion( InferUnion&& o ) : mode( o.mode ), data() { init_from( std::move(o) ); } |
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| 93 | InferUnion& operator= ( const InferUnion& ) = delete; |
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| 94 | InferUnion& operator= ( InferUnion&& ) = delete; |
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| 95 | ~InferUnion() { reset(); } |
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| 96 | |
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| 97 | ResnSlots& resnSlots() { |
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| 98 | switch (mode) { |
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| 99 | case Empty: new(&data.resnSlots) ResnSlots{}; mode = Slots; // fallthrough |
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| 100 | case Slots: return data.resnSlots; |
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| 101 | case Params: assert(!"Cannot return to resnSlots from Params"); |
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| 102 | } |
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| 103 | } |
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| 104 | |
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| 105 | InferredParams& inferParams() { |
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| 106 | switch (mode) { |
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| 107 | case Slots: data.resnSlots.~ResnSlots(); // fallthrough |
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| 108 | case Empty: new(&data.inferParams) InferredParams{}; mode = Params; // fallthrough |
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| 109 | case Params: return data.inferParams; |
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| 110 | } |
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| 111 | } |
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| 112 | }; |
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| 113 | |
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| 114 | ptr<Type> result; |
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| 115 | ptr<TypeSubstitution> env; |
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| 116 | InferUnion inferred; |
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| 117 | bool extension = false; |
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| 118 | |
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| 119 | Expr(const CodeLocation& loc ) : ParseNode( loc ), result(), env(), inferred() {} |
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| 120 | |
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| 121 | Expr* set_extension( bool ex ) { extension = ex; return this; } |
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| 122 | |
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| 123 | virtual Expr* accept( Visitor& v ) override = 0; |
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| 124 | private: |
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| 125 | virtual Expr* clone() const override = 0; |
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| 126 | }; |
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| 127 | |
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| 128 | } |
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| 129 | |
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| 130 | // Local Variables: // |
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| 131 | // tab-width: 4 // |
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| 132 | // mode: c++ // |
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| 133 | // compile-command: "make install" // |
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| 134 | // End: // |
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