source: src/ResolvExpr/TypeEnvironment.cc@ 0182bfa

new-env with_gc
Last change on this file since 0182bfa was 8e18b8e, checked in by Aaron Moss <a3moss@…>, 7 years ago

stop eagerly copying EqvClass on lookup
  • Property mode set to 100644
File size: 8.5 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// TypeEnvironment.cc --
8//
9// Author : Richard C. Bilson
10// Created On : Sun May 17 12:19:47 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Sun May 17 12:23:36 2015
13// Update Count : 3
14//
15
16#include <cassert> // for assert
17#include <algorithm> // for copy, set_intersection
18#include <iterator> // for ostream_iterator, insert_iterator
19#include <utility> // for pair, move
20
21#include "Common/PassVisitor.h" // for PassVisitor<GcTracer>
22#include "Common/utility.h" // for maybeClone
23#include "SynTree/GcTracer.h" // for PassVisitor<GcTracer>
24#include "SynTree/Type.h" // for Type, FunctionType, Type::Fora...
25#include "SynTree/TypeSubstitution.h" // for TypeSubstitution
26#include "TypeEnvironment.h"
27
28namespace ResolvExpr {
29 void printAssertionSet( const AssertionSet &assertions, std::ostream &os, int indent ) {
30 for ( AssertionSet::const_iterator i = assertions.begin(); i != assertions.end(); ++i ) {
31 i->first->print( os, indent );
32 if ( i->second.isUsed ) {
33 os << "(used)";
34 } else {
35 os << "(not used)";
36 } // if
37 } // for
38 }
39
40 void printOpenVarSet( const OpenVarSet &openVars, std::ostream &os, int indent ) {
41 os << std::string( indent, ' ' );
42 for ( OpenVarSet::const_iterator i = openVars.begin(); i != openVars.end(); ++i ) {
43 os << i->first << "(" << i->second << ") ";
44 } // for
45 }
46
47 void EqvClass::initialize( const EqvClass &src, EqvClass &dest ) {
48 dest.vars = src.vars;
49 dest.type = maybeClone( src.type );
50 dest.allowWidening = src.allowWidening;
51 dest.data = src.data;
52 }
53
54 EqvClass::EqvClass() : type( 0 ), allowWidening( true ) {
55 }
56
57 EqvClass::EqvClass( const EqvClass &other ) {
58 initialize( other, *this );
59 }
60
61 EqvClass &EqvClass::operator=( const EqvClass &other ) {
62 if ( this == &other ) return *this;
63 initialize( other, *this );
64 return *this;
65 }
66
67 void EqvClass::print( std::ostream &os, Indenter indent ) const {
68 os << "( ";
69 std::copy( vars.begin(), vars.end(), std::ostream_iterator< std::string >( os, " " ) );
70 os << ")";
71 if ( type ) {
72 os << " -> ";
73 type->print( os, indent+1 );
74 } // if
75 if ( ! allowWidening ) {
76 os << " (no widening)";
77 } // if
78 os << std::endl;
79 }
80
81 const EqvClass* TypeEnvironment::lookup( const std::string &var ) const {
82 for ( std::list< EqvClass >::const_iterator i = env.begin(); i != env.end(); ++i ) {
83 if ( i->vars.find( var ) != i->vars.end() ) {
84/// std::cout << var << " is in class ";
85/// i->print( std::cout );
86 return &*i;
87 }
88/// std::cout << var << " is not in class ";
89/// i->print( std::cout );
90 } // for
91 return nullptr;
92 }
93
94 /// Removes any class from env that intersects eqvClass
95 void filterOverlappingClasses( std::list<EqvClass> &env, const EqvClass &eqvClass ) {
96 for ( auto i = env.begin(); i != env.end(); ) {
97 auto next = i;
98 ++next;
99 std::set<std::string> intersection;
100 std::set_intersection( i->vars.begin(), i->vars.end(), eqvClass.vars.begin(), eqvClass.vars.end(),
101 std::inserter( intersection, intersection.begin() ) );
102 if ( ! intersection.empty() ) { env.erase( i ); }
103 i = next;
104 }
105 }
106
107 void TypeEnvironment::add( const EqvClass &eqvClass ) {
108 filterOverlappingClasses( env, eqvClass );
109 env.push_back( eqvClass );
110 }
111
112 void TypeEnvironment::add( EqvClass &&eqvClass ) {
113 filterOverlappingClasses( env, eqvClass );
114 env.push_back( std::move(eqvClass) );
115 }
116
117 void TypeEnvironment::add( const Type::ForallList &tyDecls ) {
118 for ( Type::ForallList::const_iterator i = tyDecls.begin(); i != tyDecls.end(); ++i ) {
119 EqvClass newClass;
120 newClass.vars.insert( (*i)->get_name() );
121 newClass.data = TypeDecl::Data{ (*i) };
122 env.push_back( newClass );
123 } // for
124 }
125
126 void TypeEnvironment::add( const TypeSubstitution & sub ) {
127 EqvClass newClass;
128 for ( auto p : sub ) {
129 newClass.vars.insert( p.first );
130 newClass.type = p.second->clone();
131 newClass.allowWidening = false;
132 // Minimal assumptions. Not technically correct, but might be good enough, and
133 // is the best we can do at the moment since information is lost in the
134 // transition to TypeSubstitution
135 newClass.data = TypeDecl::Data{ TypeDecl::Dtype, false };
136 add( newClass );
137 }
138 }
139
140 void TypeEnvironment::makeSubstitution( TypeSubstitution &sub ) const {
141 for ( std::list< EqvClass >::const_iterator theClass = env.begin(); theClass != env.end(); ++theClass ) {
142 for ( std::set< std::string >::const_iterator theVar = theClass->vars.begin(); theVar != theClass->vars.end(); ++theVar ) {
143/// std::cerr << "adding " << *theVar;
144 if ( theClass->type ) {
145/// std::cerr << " bound to ";
146/// theClass->type->print( std::cerr );
147/// std::cerr << std::endl;
148 sub.add( *theVar, theClass->type );
149 } else if ( theVar != theClass->vars.begin() ) {
150 TypeInstType *newTypeInst = new TypeInstType( Type::Qualifiers(), *theClass->vars.begin(), theClass->data.kind == TypeDecl::Ftype );
151/// std::cerr << " bound to variable " << *theClass->vars.begin() << std::endl;
152 sub.add( *theVar, newTypeInst );
153 } // if
154 } // for
155 } // for
156/// std::cerr << "input env is:" << std::endl;
157/// print( std::cerr, 8 );
158/// std::cerr << "sub is:" << std::endl;
159/// sub.print( std::cerr, 8 );
160 sub.normalize();
161 }
162
163 void TypeEnvironment::print( std::ostream &os, Indenter indent ) const {
164 for ( std::list< EqvClass >::const_iterator i = env.begin(); i != env.end(); ++i ) {
165 i->print( os, indent );
166 } // for
167 }
168
169 std::list< EqvClass >::iterator TypeEnvironment::internal_lookup( const std::string &var ) {
170 for ( std::list< EqvClass >::iterator i = env.begin(); i != env.end(); ++i ) {
171 if ( i->vars.find( var ) == i->vars.end() ) {
172 return i;
173 } // if
174 } // for
175 return env.end();
176 }
177
178 void TypeEnvironment::simpleCombine( const TypeEnvironment &second ) {
179 env.insert( env.end(), second.env.begin(), second.env.end() );
180 }
181
182 void TypeEnvironment::combine( const TypeEnvironment &second, Type *(*combineFunc)( Type*, Type* ) ) {
183 TypeEnvironment secondCopy( second );
184 for ( std::list< EqvClass >::iterator firstClass = env.begin(); firstClass != env.end(); ++firstClass ) {
185 EqvClass &newClass = *firstClass;
186 std::set< std::string > newVars;
187 for ( std::set< std::string >::const_iterator var = firstClass->vars.begin(); var != firstClass->vars.end(); ++var ) {
188 std::list< EqvClass >::iterator secondClass = secondCopy.internal_lookup( *var );
189 if ( secondClass != secondCopy.env.end() ) {
190 newVars.insert( secondClass->vars.begin(), secondClass->vars.end() );
191 if ( secondClass->type ) {
192 if ( newClass.type ) {
193 newClass.type = combineFunc( newClass.type, secondClass->type );
194 newClass.allowWidening = newClass.allowWidening && secondClass->allowWidening;
195 } else {
196 newClass.type = secondClass->type->clone();
197 newClass.allowWidening = secondClass->allowWidening;
198 } // if
199 } // if
200 secondCopy.env.erase( secondClass );
201 } // if
202 } // for
203 newClass.vars.insert( newVars.begin(), newVars.end() );
204 } // for
205 for ( std::list< EqvClass >::iterator secondClass = secondCopy.env.begin(); secondClass != secondCopy.env.end(); ++secondClass ) {
206 env.push_back( *secondClass );
207 } // for
208 }
209
210 void TypeEnvironment::extractOpenVars( OpenVarSet &openVars ) const {
211 for ( std::list< EqvClass >::const_iterator eqvClass = env.begin(); eqvClass != env.end(); ++eqvClass ) {
212 for ( std::set< std::string >::const_iterator var = eqvClass->vars.begin(); var != eqvClass->vars.end(); ++var ) {
213 openVars[ *var ] = eqvClass->data;
214 } // for
215 } // for
216 }
217
218 void TypeEnvironment::addActual( const TypeEnvironment& actualEnv, OpenVarSet& openVars ) {
219 for ( const EqvClass& c : actualEnv ) {
220 EqvClass c2 = c;
221 c2.allowWidening = false;
222 for ( const std::string& var : c2.vars ) {
223 openVars[ var ] = c2.data;
224 }
225 env.push_back( std::move(c2) );
226 }
227 }
228
229 std::ostream & operator<<( std::ostream & out, const TypeEnvironment & env ) {
230 env.print( out );
231 return out;
232 }
233
234 PassVisitor<GcTracer> & operator<<( PassVisitor<GcTracer> & gc, const TypeEnvironment & env ) {
235 for ( const EqvClass & c : env ) {
236 maybeAccept( c.type, gc );
237 }
238 return gc;
239 }
240} // namespace ResolvExpr
241
242// Local Variables: //
243// tab-width: 4 //
244// mode: c++ //
245// compile-command: "make install" //
246// End: //
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