source: src/SymTab/TypeEquality.cc@ 10dc6908

ADT arm-eh ast-experimental cleanup-dtors enum forall-pointer-decay jacob/cs343-translation jenkins-sandbox new-ast new-ast-unique-expr pthread-emulation qualifiedEnum
Last change on this file since 10dc6908 was 30f9072, checked in by Thierry Delisle <tdelisle@…>, 8 years ago

More cleanup on the headers
  • Property mode set to 100644
File size: 6.7 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// TypeEquality.cc --
8//
9// Author : Rob Schluntz
10// Created On : Tue Jul 07 16:28:29 2015
11// Last Modified By : Rob Schluntz
12// Last Modified On : Mon Jul 20 14:16:11 2015
13// Update Count : 37
14//
15#include "TypeEquality.h"
16
17#include <cassert> // for assert
18#include <list> // for list, list<>::iterator, _List_iterator
19#include <string> // for operator==, string, basic_string
20
21#include "SynTree/Constant.h" // for Constant
22#include "SynTree/Declaration.h" // for DeclarationWithType
23#include "SynTree/Expression.h" // for ConstantExpr, Expression
24#include "SynTree/Type.h" // for Type, ArrayType, FunctionType, Enum...
25#include "SynTree/Visitor.h" // for Visitor
26
27namespace SymTab {
28 class TypeEquality : public Visitor {
29 public:
30 TypeEquality( Type * other, bool vlaErr ) : result( true ), other( other ),
31 vlaErr( vlaErr ) {}
32 bool result;
33
34 private:
35 virtual void visit( FunctionType *funcType );
36 virtual void visit( VoidType *voidType );
37 virtual void visit( BasicType *basicType );
38 virtual void visit( PointerType *pointerType );
39 virtual void visit( ArrayType *arrayType );
40 virtual void visit( StructInstType *structInst );
41 virtual void visit( UnionInstType *unionInst );
42 virtual void visit( EnumInstType *enumInst );
43 virtual void visit( TypeInstType *typeInst );
44 virtual void visit( VarArgsType *varArgsType );
45 virtual void visit( ZeroType *zeroType );
46 virtual void visit( OneType *oneType );
47
48 void handleQualifiers( Type * t );
49
50 Type * other;
51 bool vlaErr;
52 };
53
54 bool typeEquals( Type * t1, Type * t2, bool vlaErr ) {
55 TypeEquality teq( t2, vlaErr );
56 t1->accept( teq );
57 return teq.result;
58 }
59
60 void TypeEquality::handleQualifiers( Type * t ) {
61 result = result && t->get_qualifiers() == other->get_qualifiers();
62 }
63
64 void TypeEquality::visit( VoidType *voidType ) {
65 handleQualifiers( voidType );
66 if ( ! dynamic_cast< VoidType * >( other ) ) {
67 result = false;
68 }
69 }
70
71 void TypeEquality::visit( BasicType *basicType ) {
72 handleQualifiers( basicType );
73 if ( BasicType * bt = dynamic_cast< BasicType * >( other ) ) {
74 result = result && basicType->get_kind() == bt->get_kind();
75 } else {
76 result = false;
77 }
78 }
79
80 void TypeEquality::visit( PointerType *pointerType ) {
81 handleQualifiers( pointerType );
82 if ( PointerType * pt = dynamic_cast< PointerType * >( other ) ) {
83 other = pt->get_base();
84 pointerType->get_base()->accept( *this );
85 } else {
86 result = false;
87 }
88 }
89
90 void TypeEquality::visit( ArrayType *arrayType ) {
91 handleQualifiers( arrayType );
92
93 if ( ArrayType * at = dynamic_cast< ArrayType * >( other ) ) {
94 // to be equal, array types must both be VLA or both not VLA
95 // and must both have a dimension expression or not have a dimension
96 result = result && arrayType->get_isVarLen() == at->get_isVarLen()
97 && ((arrayType->get_dimension() != 0 && at->get_dimension() != 0)
98 || (arrayType->get_dimension() == 0 && at->get_dimension() == 0));
99
100 if ( vlaErr ) {
101 // useful for comparing typedef types - in this case, we
102 // want types to appear distinct if either is a VLA type
103 if ( arrayType->get_isVarLen() || at->get_isVarLen() ) {
104 result = false;
105 }
106 }
107
108 if ( ! arrayType->get_isVarLen() && ! at->get_isVarLen() &&
109 arrayType->get_dimension() != 0 && at->get_dimension() != 0 ) {
110 ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() );
111 ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( at->get_dimension() );
112 assert(ce1 && ce2);
113
114 Constant * c1 = ce1->get_constant();
115 Constant * c2 = ce2->get_constant();
116
117 result = result && c1->get_value() == c2->get_value();
118 }
119
120 other = at->get_base();
121 arrayType->get_base()->accept( *this );
122 } else {
123 result = false;
124 }
125 }
126
127 void TypeEquality::visit( FunctionType *funcType ) {
128 handleQualifiers( funcType );
129
130 if ( FunctionType * ft = dynamic_cast< FunctionType * >( other ) ) {
131 // function types must have the same number of return types
132 // and parameters to be equivalent
133 result = result && funcType->get_returnVals().size() == ft->get_returnVals().size()
134 && funcType->get_parameters().size() == ft->get_parameters().size()
135 && funcType->get_isVarArgs() == ft->get_isVarArgs();
136
137 std::list< DeclarationWithType * >::iterator it1, it2;
138
139 // return types must be equivalent
140 it1 = funcType->get_returnVals().begin();
141 it2 = ft->get_returnVals().begin();
142 for ( ; it1 != funcType->get_returnVals().end(); ++it1, ++it2 ) {
143 if ( ! result ) return;
144 other = (*it2)->get_type();
145 (*it1)->get_type()->accept( *this );
146 }
147
148 // parameter types must be equivalent
149 it1 = funcType->get_parameters().begin();
150 it2 = ft->get_parameters().begin();
151 for ( ; it1 != funcType->get_parameters().end(); ++it1, ++it2 ) {
152 if ( ! result ) return;
153 other = (*it2)->get_type();
154 (*it1)->get_type()->accept( *this );
155 }
156 } else {
157 result = false;
158 }
159 }
160
161 // aggregate types only need to have the same name
162 void TypeEquality::visit( StructInstType *structInst ) {
163 handleQualifiers( structInst );
164 if ( StructInstType * st = dynamic_cast< StructInstType * >( other ) ) {
165 result = result && structInst->get_name() == st->get_name();
166 } else {
167 result = false;
168 }
169 }
170
171 void TypeEquality::visit( UnionInstType *unionInst ) {
172 handleQualifiers( unionInst );
173 if ( UnionInstType * ut = dynamic_cast< UnionInstType * >( other ) ) {
174 result = result && unionInst->get_name() == ut->get_name();
175 } else {
176 result = false;
177 }
178 }
179
180 void TypeEquality::visit( EnumInstType *enumInst ) {
181 handleQualifiers( enumInst );
182 if ( EnumInstType * et = dynamic_cast< EnumInstType * >( other ) ) {
183 result = result && enumInst->get_name() == et->get_name();
184 } else {
185 result = false;
186 }
187 }
188
189 void TypeEquality::visit( TypeInstType *typeInst ) {
190 handleQualifiers( typeInst );
191 if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( other ) ) {
192 result = result && typeInst->get_name() == tt->get_name();
193 } else {
194 result = false;
195 }
196 }
197
198 void TypeEquality::visit( VarArgsType *varArgsType ) {
199 handleQualifiers( varArgsType );
200 if ( ! dynamic_cast< VarArgsType * >( other ) ) {
201 result = false;
202 }
203 }
204
205 void TypeEquality::visit( ZeroType *zeroType ) {
206 handleQualifiers( zeroType );
207 if ( ! dynamic_cast< ZeroType * >( other ) ) {
208 result = false;
209 }
210 }
211
212 void TypeEquality::visit( OneType *oneType ) {
213 handleQualifiers( oneType );
214 if ( ! dynamic_cast< OneType * >( other ) ) {
215 result = false;
216 }
217 }
218} // namespace SymTab
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