source: src/SymTab/TypeEquality.cc@ 1cced28

ADT aaron-thesis arm-eh ast-experimental cleanup-dtors ctor deferred_resn demangler enum forall-pointer-decay gc_noraii jacob/cs343-translation jenkins-sandbox memory new-ast new-ast-unique-expr new-env no_list persistent-indexer pthread-emulation qualifiedEnum resolv-new string with_gc
Last change on this file since 1cced28 was 994ec2c, checked in by Rob Schluntz <rschlunt@…>, 10 years ago

fix warning in logical expression
  • Property mode set to 100644
File size: 5.8 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
16#include <list>
17#include <iterator>
18#include "Validate.h"
19#include "SynTree/Visitor.h"
20#include "SynTree/Type.h"
21#include "SynTree/Statement.h"
22#include "SynTree/TypeSubstitution.h"
23#include "Indexer.h"
24#include "TypeEquality.h"
25
26namespace SymTab {
27 class TypeEquality : public Visitor {
28 public:
29 TypeEquality( Type * other, bool vlaErr ) : result( true ), other( other ),
30 vlaErr( vlaErr ) {}
31 bool result;
32
33 private:
34 virtual void visit( FunctionType *funcType );
35 virtual void visit( VoidType *voidType );
36 virtual void visit( BasicType *basicType );
37 virtual void visit( PointerType *pointerType );
38 virtual void visit( ArrayType *arrayType );
39 virtual void visit( StructInstType *structInst );
40 virtual void visit( UnionInstType *unionInst );
41 virtual void visit( EnumInstType *enumInst );
42 virtual void visit( TypeInstType *typeInst );
43
44 void handleQualifiers( Type * t );
45
46 Type * other;
47 bool vlaErr;
48 };
49
50 bool typeEquals( Type * t1, Type * t2, bool vlaErr ) {
51 TypeEquality teq( t2, vlaErr );
52 t1->accept( teq );
53 return teq.result;
54 }
55
56 void TypeEquality::handleQualifiers( Type * t ) {
57 result = result && t->get_qualifiers() == other->get_qualifiers();
58 }
59
60 void TypeEquality::visit( VoidType *voidType ) {
61 handleQualifiers( voidType );
62 if ( ! dynamic_cast< VoidType * >( other ) ) {
63 result = false;
64 }
65 }
66
67 void TypeEquality::visit( BasicType *basicType ) {
68 handleQualifiers( basicType );
69 if ( BasicType * bt = dynamic_cast< BasicType * >( other ) ) {
70 result = result && basicType->get_kind() == bt->get_kind();
71 } else {
72 result = false;
73 }
74 }
75
76 void TypeEquality::visit( PointerType *pointerType ) {
77 handleQualifiers( pointerType );
78 if ( PointerType * pt = dynamic_cast< PointerType * >( other ) ) {
79 other = pt->get_base();
80 pointerType->get_base()->accept( *this );
81 } else {
82 result = false;
83 }
84 }
85
86 void TypeEquality::visit( ArrayType *arrayType ) {
87 handleQualifiers( arrayType );
88
89 if ( ArrayType * at = dynamic_cast< ArrayType * >( other ) ) {
90 // to be equal, array types must both be VLA or both not VLA
91 // and must both have a dimension expression or not have a dimension
92 result = result && arrayType->get_isVarLen() == at->get_isVarLen()
93 && ((arrayType->get_dimension() != 0 && at->get_dimension() != 0)
94 || (arrayType->get_dimension() == 0 && at->get_dimension() == 0));
95
96 if ( vlaErr ) {
97 // useful for comparing typedef types - in this case, we
98 // want types to appear distinct if either is a VLA type
99 if ( arrayType->get_isVarLen() || at->get_isVarLen() ) {
100 result = false;
101 }
102 }
103
104 if ( ! arrayType->get_isVarLen() && ! at->get_isVarLen() &&
105 arrayType->get_dimension() != 0 && at->get_dimension() != 0 ) {
106 ConstantExpr * ce1 = dynamic_cast< ConstantExpr * >( arrayType->get_dimension() );
107 ConstantExpr * ce2 = dynamic_cast< ConstantExpr * >( at->get_dimension() );
108 assert(ce1 && ce2);
109
110 Constant * c1 = ce1->get_constant();
111 Constant * c2 = ce2->get_constant();
112
113 result = result && c1->get_value() == c2->get_value();
114 }
115
116 other = at->get_base();
117 arrayType->get_base()->accept( *this );
118 } else {
119 result = false;
120 }
121 }
122
123 void TypeEquality::visit( FunctionType *funcType ) {
124 handleQualifiers( funcType );
125
126 if ( FunctionType * ft = dynamic_cast< FunctionType * >( other ) ) {
127 // function types must have the same number of return types
128 // and parameters to be equivalent
129 result = result && funcType->get_returnVals().size() == ft->get_returnVals().size()
130 && funcType->get_parameters().size() == ft->get_parameters().size()
131 && funcType->get_isVarArgs() == ft->get_isVarArgs();
132
133 std::list< DeclarationWithType * >::iterator it1, it2;
134
135 // return types must be equivalent
136 it1 = funcType->get_returnVals().begin();
137 it2 = ft->get_returnVals().begin();
138 for ( ; it1 != funcType->get_returnVals().end(); ++it1, ++it2 ) {
139 if ( ! result ) return;
140 other = (*it2)->get_type();
141 (*it1)->get_type()->accept( *this );
142 }
143
144 // parameter types must be equivalent
145 it1 = funcType->get_parameters().begin();
146 it2 = ft->get_parameters().begin();
147 for ( ; it1 != funcType->get_parameters().end(); ++it1, ++it2 ) {
148 if ( ! result ) return;
149 other = (*it2)->get_type();
150 (*it1)->get_type()->accept( *this );
151 }
152 } else {
153 result = false;
154 }
155 }
156
157 // aggregate types only need to have the same name
158 void TypeEquality::visit( StructInstType *structInst ) {
159 handleQualifiers( structInst );
160 if ( StructInstType * st = dynamic_cast< StructInstType * >( other ) ) {
161 result = result && structInst->get_name() == st->get_name();
162 } else {
163 result = false;
164 }
165 }
166
167 void TypeEquality::visit( UnionInstType *unionInst ) {
168 handleQualifiers( unionInst );
169 if ( UnionInstType * ut = dynamic_cast< UnionInstType * >( other ) ) {
170 result = result && unionInst->get_name() == ut->get_name();
171 } else {
172 result = false;
173 }
174 }
175
176 void TypeEquality::visit( EnumInstType *enumInst ) {
177 handleQualifiers( enumInst );
178 if ( EnumInstType * et = dynamic_cast< EnumInstType * >( other ) ) {
179 result = result && enumInst->get_name() == et->get_name();
180 } else {
181 result = false;
182 }
183 }
184
185 void TypeEquality::visit( TypeInstType *typeInst ) {
186 handleQualifiers( typeInst );
187 if ( TypeInstType * tt = dynamic_cast< TypeInstType * >( other ) ) {
188 result = result && typeInst->get_name() == tt->get_name();
189 } else {
190 result = false;
191 }
192 }
193} // namespace SymTab
Note: See TracBrowser for help on using the repository browser.