source: src/ResolvExpr/TypeMap.h@ a16a7ec

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors deferred_resn demangler enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new with_gc
Last change on this file since a16a7ec was 6b0b624, checked in by Peter A. Buhr <pabuhr@…>, 8 years ago

change #ifndef to #pragma once
  • Property mode set to 100644
File size: 7.0 KB
Line 
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// ScopedMap.h --
8//
9// Author : Aaron B. Moss
10// Created On : Fri Feb 19 13:55:00 2016
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Sat Jul 22 09:37:19 2017
13// Update Count : 2
14//
15
16#pragma once
17
18#include <map>
19#include <string>
20#include <utility>
21#include <vector>
22
23#include "SynTree/Type.h"
24#include "SynTree/Visitor.h"
25
26namespace ResolvExpr {
27
28 /// A map from types to some value; lookup is done by structural decomposition on types.
29 /// The TypeMap stores its values by reference, so stored objects should be kept alive by the caller.
30 /// The scoping mechanism essentially by keeping a list of changes to roll back, then rolling them back
31 /// WARNING: This map is only incompletely and approximately consistent with the resolution rules in Unify.cc;
32 /// it has potential, if extended, to form the basis of a resolver that is more performant than the current
33 /// linear-search-by-unification approach, but is only currently used for finding assignment operators in GenPoly::box.
34 template< typename Value >
35 class TypeMap {
36 /// Map of names to types
37 typedef typename std::map< std::string, Value* > ValueMap;
38 typedef typename ValueMap::iterator ValueMapIterator;
39
40 Value *voidValue; ///< Value for void type
41 Value *basicValue[BasicType::NUMBER_OF_BASIC_TYPES]; ///< Values for basic types
42 Value *pointerValue; ///< Value for all pointer types
43 Value *voidPointerValue; ///< Value for void* types
44 Value *functionPointerValue; ///< Value for all function pointer types
45 ValueMap structValue; ///< Values for struct types, indexed by name
46 ValueMap unionValue; ///< Values for struct types, indexed by name
47 ValueMap enumValue; ///< Values for struct types, indexed by name
48
49 /// Information needed to roll back one scope change
50 struct Rollback {
51 /// One scope of pointer rollbacks
52 typedef std::vector< std::pair< Value **, Value* > > PointerScope;
53 /// One scope of map rollbacks
54 typedef std::vector< std::pair< ValueMapIterator, Value* > > MapScope;
55
56 PointerScope pointers; ///< Value pointers to roll back to their previous state
57 MapScope mapNodes; ///< Value map iterators to roll back to their previous state
58
59 void addRollback( Value **loc, Value *old ) {
60 pointers.push_back( std::make_pair( loc, old ) );
61 }
62
63 void addRollback( ValueMapIterator loc, Value *old ) {
64 mapNodes.push_back( std::make_pair( loc, old ) );
65 }
66 };
67
68 std::vector< Rollback > scopes; ///< Scope rollback information
69
70 struct Lookup : public Visitor {
71 Lookup( TypeMap<Value> &typeMap ) : typeMap( typeMap ), found( 0 ), toInsert( 0 ) {}
72
73 /// Inserts a new value into the map; returns the old value (if set, NULL otherwise).
74 /// key must be non-null.
75 Value *insert( Type *key, Value *val ) {
76 toInsert = val;
77 key->accept( *this );
78 return found;
79 }
80
81 /// Looks up a value in the map.
82 /// key must be non-null.
83 Value *find( Type *key ) {
84 //toInsert = 0;
85 key->accept( *this );
86 return found;
87 }
88
89 void findAndReplace( Value *&loc ) {
90 found = loc;
91 if ( toInsert ) {
92 typeMap.scopes.back().addRollback( &loc, found );
93 loc = toInsert;
94 }
95 }
96
97 void findAndReplace( ValueMap &map, const std::string &name ) {
98 ValueMapIterator loc = map.find( name );
99 if ( loc != map.end() ) {
100 found = loc->second;
101 if ( toInsert ) {
102 typeMap.scopes.back().addRollback( loc, found );
103 loc->second = toInsert;
104 }
105 } else if ( toInsert ) {
106 loc = map.insert( loc, std::make_pair( name, toInsert ) );
107 typeMap.scopes.back().addRollback( loc, found );
108 }
109 }
110
111 virtual void visit( __attribute__((unused)) VoidType *voidType ) {
112 findAndReplace( typeMap.voidValue );
113 }
114
115 virtual void visit( BasicType *basicType ) {
116 findAndReplace( typeMap.basicValue[basicType->get_kind()] );
117 }
118
119 virtual void visit( PointerType *pointerType ) {
120 // NOTE This is one of the places where the apporoximation of the resolver is (deliberately) poor;
121 // A better version would likely not equate all pointer types to a match.
122 if ( dynamic_cast< FunctionType* >( pointerType->get_base() ) ) {
123 findAndReplace( typeMap.functionPointerValue );
124 } else if ( dynamic_cast< VoidType* >( pointerType->get_base() ) ) {
125 findAndReplace( typeMap.voidPointerValue );
126 } else {
127 findAndReplace( typeMap.pointerValue );
128 }
129 }
130
131 virtual void visit( ArrayType *arrayType ) {
132 if ( dynamic_cast< FunctionType* >( arrayType->get_base() ) ) {
133 findAndReplace( typeMap.functionPointerValue );
134 } else {
135 findAndReplace( typeMap.pointerValue );
136 }
137 }
138
139 virtual void visit( __attribute__((unused)) FunctionType *functionType ) {
140 findAndReplace( typeMap.functionPointerValue );
141 }
142
143 virtual void visit( StructInstType *structType ) {
144 findAndReplace( typeMap.structValue, structType->get_name() );
145 }
146
147 virtual void visit( UnionInstType *unionType ) {
148 findAndReplace( typeMap.unionValue, unionType->get_name() );
149 }
150
151 virtual void visit( EnumInstType *enumType ) {
152 findAndReplace( typeMap.enumValue, enumType->get_name() );
153 }
154
155 TypeMap<Value> &typeMap; ///< map storage
156 Value *found; ///< Value found (NULL if none yet)
157 Value *toInsert; ///< Value to insert (NULL if a lookup)
158 }; // struct Lookup
159 friend struct Lookup;
160
161 public:
162 /// Starts a new scope
163 void beginScope() {
164 Rollback scope;
165 scopes.push_back(scope);
166 }
167
168 /// Ends a scope; rolls back any changes made during that scope
169 void endScope() {
170 Rollback &scope = scopes.back();
171 /// Roll back pointer changes
172 for (unsigned i = 0; i < scope.pointers.size(); ++i) {
173 *scope.pointers[i].first = scope.pointers[i].second;
174 }
175 /// Roll back map changes
176 for (unsigned i = 0; i < scope.mapNodes.size(); ++i) {
177 scope.mapNodes[i].first->second = scope.mapNodes[i].second;
178 }
179 scopes.pop_back();
180 }
181
182 TypeMap() : voidValue( 0 ), pointerValue( 0 ), voidPointerValue( 0 ), functionPointerValue( 0 ), structValue(), unionValue(), enumValue(), scopes() {
183 beginScope();
184 for (int i = 0; i < BasicType::NUMBER_OF_BASIC_TYPES; ++i) { basicValue[i] = 0; }
185 }
186
187 /// Inserts a new value into the map; returns the old value (if set, NULL otherwise).
188 /// key, val must be non-null.
189 Value *insert( Type *key, Value *val ) {
190 Lookup searcher( *this );
191 return searcher.insert( key, val );
192 }
193
194 /// Looks up a value in the map.
195 /// key must be non-null
196 Value *find( Type *key ) {
197 Lookup searcher( *this );
198 return searcher.find( key );
199 }
200
201 }; // class TypeMap
202
203} // namespace ResolvExpr
204
205// Local Variables: //
206// tab-width: 4 //
207// mode: c++ //
208// compile-command: "make install" //
209// End: //
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