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source: src/ResolvExpr/CommonType.cc @ 6ece306

ADT

Last change on this file since 6ece306 was 5bf3976, checked in by Andrew Beach <ajbeach@…>, 22 months ago
Header Clean-Up: Created new headers for new AST typeops and moved declarations.
Property mode set to `100644`
File size: 67.8 KB

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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	// CommonType.cc --
8	//
9	// Author : Richard C. Bilson
10	// Created On : Sun May 17 06:59:27 2015
11	// Last Modified By : Peter A. Buhr
12	// Last Modified On : Thu Feb 14 17:10:10 2019
13	// Update Count : 24
14	//
15
16	#include "CommonType.hpp"
17
18	#include <cassert> // for strict_dynamic_cast
19	#include <map> // for _Rb_tree_const_iterator
20	#include <utility> // for pair
21
22	#include "AST/Decl.hpp"
23	#include "AST/Type.hpp"
24	#include "Common/PassVisitor.h"
25	#include "ResolvExpr/TypeEnvironment.h" // for OpenVarSet, AssertionSet
26	#include "SymTab/Indexer.h" // for Indexer
27	#include "SynTree/Declaration.h" // for TypeDecl, NamedTypeDecl (ptr...
28	#include "SynTree/Type.h" // for BasicType, BasicType::Kind::...
29	#include "SynTree/Visitor.h" // for Visitor
30	#include "Unify.h" // for unifyExact, WidenMode
31	#include "typeops.h" // for isFtype
32	#include "Tuples/Tuples.h"
33
34	// #define DEBUG
35	#ifdef DEBUG
36	#define PRINT(x) x
37	#else
38	#define PRINT(x)
39	#endif
40
41	namespace ResolvExpr {
42	struct CommonType_old : public WithShortCircuiting {
43	CommonType_old( Type * type2, bool widenFirst, bool widenSecond, const SymTab::Indexer &indexer, TypeEnvironment &env, const OpenVarSet &openVars );
44	Type * get_result() const { return result; }
45
46	void previsit( BaseSyntaxNode * ) { visit_children = false; }
47
48	void postvisit( VoidType * voidType );
49	void postvisit( BasicType * basicType );
50	void postvisit( PointerType * pointerType );
51	void postvisit( ArrayType * arrayType );
52	void postvisit( ReferenceType * refType );
53	void postvisit( FunctionType * functionType );
54	void postvisit( StructInstType * aggregateUseType );
55	void postvisit( UnionInstType * aggregateUseType );
56	void postvisit( EnumInstType * aggregateUseType );
57	void postvisit( TraitInstType * aggregateUseType );
58	void postvisit( TypeInstType * aggregateUseType );
59	void postvisit( TupleType * tupleType );
60	void postvisit( VarArgsType * varArgsType );
61	void postvisit( ZeroType * zeroType );
62	void postvisit( OneType * oneType );
63
64	private:
65	template< typename Pointer > void getCommonWithVoidPointer( Pointer * voidPointer, Pointer * otherPointer );
66	template< typename RefType > void handleRefType( RefType * inst, Type * other );
67
68	Type * result;
69	Type * type2; // inherited
70	bool widenFirst, widenSecond;
71	const SymTab::Indexer &indexer;
72	TypeEnvironment &env;
73	const OpenVarSet &openVars;
74	};
75
76	Type * handleReference( Type * t1, Type * t2, bool widenFirst, bool widenSecond, const SymTab::Indexer &indexer, TypeEnvironment & env, const OpenVarSet &openVars ) {
77	Type * common = nullptr;
78	AssertionSet have, need;
79	OpenVarSet newOpen( openVars );
80	// need unify to bind type variables
81	if ( unify( t1, t2, env, have, need, newOpen, indexer, common ) ) {
82	PRINT(
83	std::cerr << "unify success: " << widenFirst << " " << widenSecond << std::endl;
84	)
85	if ( (widenFirst \|\| t2->tq <= t1->tq) && (widenSecond \|\| t1->tq <= t2->tq) ) {
86	PRINT(
87	std::cerr << "widen okay" << std::endl;
88	)
89	common->tq \|= t1->tq;
90	common->tq \|= t2->tq;
91	return common;
92	}
93	}
94	PRINT(
95	std::cerr << "exact unify failed: " << t1 << " " << t2 << std::endl;
96	)
97	return nullptr;
98	}
99
100	Type * commonType( Type * type1, Type * type2, bool widenFirst, bool widenSecond, const SymTab::Indexer &indexer, TypeEnvironment &env, const OpenVarSet &openVars ) {
101	PassVisitor<CommonType_old> visitor( type2, widenFirst, widenSecond, indexer, env, openVars );
102
103	int depth1 = type1->referenceDepth();
104	int depth2 = type2->referenceDepth();
105	if ( depth1 > 0 \|\| depth2 > 0 ) {
106	int diff = depth1-depth2;
107	// TODO: should it be possible for commonType to generate complicated conversions? I would argue no, only conversions that involve types of the same reference level or a difference of 1 should be allowed.
108	// if ( diff > 1 \|\| diff < -1 ) return nullptr;
109
110	// special case where one type has a reference depth of 1 larger than the other
111	if ( diff > 0 \|\| diff < 0 ) {
112	PRINT(
113	std::cerr << "reference depth diff: " << diff << std::endl;
114	)
115	Type * result = nullptr;
116	ReferenceType * ref1 = dynamic_cast< ReferenceType * >( type1 );
117	ReferenceType * ref2 = dynamic_cast< ReferenceType * >( type2 );
118	if ( diff > 0 ) {
119	// deeper on the left
120	assert( ref1 );
121	result = handleReference( ref1->base, type2, widenFirst, widenSecond, indexer, env, openVars );
122	} else {
123	// deeper on the right
124	assert( ref2 );
125	result = handleReference( type1, ref2->base, widenFirst, widenSecond, indexer, env, openVars );
126	}
127	if ( result && ref1 ) {
128	// formal is reference, so result should be reference
129	PRINT(
130	std::cerr << "formal is reference; result should be reference" << std::endl;
131	)
132	result = new ReferenceType( ref1->tq, result );
133	}
134	PRINT(
135	std::cerr << "common type of reference [" << type1 << "] and [" << type2 << "] is [" << result << "]" << std::endl;
136	)
137	return result;
138	}
139	// otherwise, both are reference types of the same depth and this is handled by the CommonType visitor.
140	}
141
142	type1->accept( visitor );
143	Type * result = visitor.pass.get_result();
144	if ( ! result ) {
145	// this appears to be handling for opaque type declarations
146	if ( widenSecond ) {
147	if ( const TypeInstType * inst = dynamic_cast< const TypeInstType * >( type2 ) ) {
148	if ( const NamedTypeDecl * nt = indexer.lookupType( inst->get_name() ) ) {
149	const TypeDecl * type = strict_dynamic_cast< const TypeDecl * >( nt );
150	if ( type->get_base() ) {
151	Type::Qualifiers tq1 = type1->tq, tq2 = type2->tq;
152	AssertionSet have, need;
153	OpenVarSet newOpen( openVars );
154	type1->tq = Type::Qualifiers();
155	type->get_base()->tq = tq1;
156	if ( unifyExact( type1, type->get_base(), env, have, need, newOpen, indexer ) ) {
157	result = type1->clone();
158	result->tq = tq1 \| tq2;
159	} // if
160	type1->tq = tq1;
161	type->get_base()->tq = Type::Qualifiers();
162	} // if
163	} // if
164	} // if
165	} // if
166	} // if
167	#ifdef DEBUG
168	std::cerr << "============= commonType" << std::endl << "type1 is ";
169	type1->print( std::cerr );
170	std::cerr << " type2 is ";
171	type2->print( std::cerr );
172	if ( result ) {
173	std::cerr << " common type is ";
174	result->print( std::cerr );
175	} else {
176	std::cerr << " no common type";
177	} // if
178	std::cerr << std::endl;
179	#endif
180	return result;
181	}
182
183	// GENERATED START, DO NOT EDIT
184	// GENERATED BY BasicTypes-gen.cc
185	#define BT BasicType::
186	static const BasicType::Kind commonTypes[BasicType::NUMBER_OF_BASIC_TYPES][BasicType::NUMBER_OF_BASIC_TYPES] = { // nearest common ancestor
187	/* B C SC UC SI SUI
188	I UI LI LUI LLI LLUI
189	IB UIB _FH _FH _F _FC
190	F FC _FX _FXC FD _FDC
191	D DC F80X _FDXC F80 _FB
192	_FLDC FB LD LDC _FBX _FLDXC
193	*/
194	{
195	/* B */ BT Bool, BT Char, BT SignedChar, BT UnsignedChar, BT ShortSignedInt, BT ShortUnsignedInt,
196	BT SignedInt, BT UnsignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
197	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
198	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
199	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
200	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
201	},
202	{
203	/* C */ BT Char, BT Char, BT SignedChar, BT UnsignedChar, BT ShortSignedInt, BT ShortUnsignedInt,
204	BT SignedInt, BT UnsignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
205	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
206	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
207	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
208	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
209	},
210	{
211	/* SC */ BT SignedChar, BT SignedChar, BT SignedChar, BT UnsignedChar, BT ShortSignedInt, BT ShortUnsignedInt,
212	BT SignedInt, BT UnsignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
213	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
214	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
215	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
216	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
217	},
218	{
219	/* UC */ BT UnsignedChar, BT UnsignedChar, BT UnsignedChar, BT UnsignedChar, BT ShortSignedInt, BT ShortUnsignedInt,
220	BT SignedInt, BT UnsignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
221	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
222	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
223	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
224	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
225	},
226	{
227	/* SI */ BT ShortSignedInt, BT ShortSignedInt, BT ShortSignedInt, BT ShortSignedInt, BT ShortSignedInt, BT ShortUnsignedInt,
228	BT SignedInt, BT UnsignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
229	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
230	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
231	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
232	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
233	},
234	{
235	/* SUI */ BT ShortUnsignedInt, BT ShortUnsignedInt, BT ShortUnsignedInt, BT ShortUnsignedInt, BT ShortUnsignedInt, BT ShortUnsignedInt,
236	BT SignedInt, BT UnsignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
237	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
238	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
239	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
240	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
241	},
242	{
243	/* I */ BT SignedInt, BT SignedInt, BT SignedInt, BT SignedInt, BT SignedInt, BT SignedInt,
244	BT SignedInt, BT UnsignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
245	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
246	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
247	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
248	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
249	},
250	{
251	/* UI */ BT UnsignedInt, BT UnsignedInt, BT UnsignedInt, BT UnsignedInt, BT UnsignedInt, BT UnsignedInt,
252	BT UnsignedInt, BT UnsignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
253	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
254	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
255	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
256	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
257	},
258	{
259	/* LI */ BT LongSignedInt, BT LongSignedInt, BT LongSignedInt, BT LongSignedInt, BT LongSignedInt, BT LongSignedInt,
260	BT LongSignedInt, BT LongSignedInt, BT LongSignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
261	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
262	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
263	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
264	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
265	},
266	{
267	/* LUI */ BT LongUnsignedInt, BT LongUnsignedInt, BT LongUnsignedInt, BT LongUnsignedInt, BT LongUnsignedInt, BT LongUnsignedInt,
268	BT LongUnsignedInt, BT LongUnsignedInt, BT LongUnsignedInt, BT LongUnsignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
269	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
270	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
271	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
272	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
273	},
274	{
275	/* LLI */ BT LongLongSignedInt, BT LongLongSignedInt, BT LongLongSignedInt, BT LongLongSignedInt, BT LongLongSignedInt, BT LongLongSignedInt,
276	BT LongLongSignedInt, BT LongLongSignedInt, BT LongLongSignedInt, BT LongLongSignedInt, BT LongLongSignedInt, BT LongLongUnsignedInt,
277	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
278	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
279	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
280	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
281	},
282	{
283	/* LLUI */ BT LongLongUnsignedInt, BT LongLongUnsignedInt, BT LongLongUnsignedInt, BT LongLongUnsignedInt, BT LongLongUnsignedInt, BT LongLongUnsignedInt,
284	BT LongLongUnsignedInt, BT LongLongUnsignedInt, BT LongLongUnsignedInt, BT LongLongUnsignedInt, BT LongLongUnsignedInt, BT LongLongUnsignedInt,
285	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
286	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
287	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
288	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
289	},
290	{
291	/* IB */ BT SignedInt128, BT SignedInt128, BT SignedInt128, BT SignedInt128, BT SignedInt128, BT SignedInt128,
292	BT SignedInt128, BT SignedInt128, BT SignedInt128, BT SignedInt128, BT SignedInt128, BT SignedInt128,
293	BT SignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
294	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
295	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
296	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
297	},
298	{
299	/* UIB */ BT UnsignedInt128, BT UnsignedInt128, BT UnsignedInt128, BT UnsignedInt128, BT UnsignedInt128, BT UnsignedInt128,
300	BT UnsignedInt128, BT UnsignedInt128, BT UnsignedInt128, BT UnsignedInt128, BT UnsignedInt128, BT UnsignedInt128,
301	BT UnsignedInt128, BT UnsignedInt128, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
302	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
303	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
304	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
305	},
306	{
307	/* _FH */ BT uFloat16, BT uFloat16, BT uFloat16, BT uFloat16, BT uFloat16, BT uFloat16,
308	BT uFloat16, BT uFloat16, BT uFloat16, BT uFloat16, BT uFloat16, BT uFloat16,
309	BT uFloat16, BT uFloat16, BT uFloat16, BT uFloat16Complex, BT uFloat32, BT uFloat32Complex,
310	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
311	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
312	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
313	},
314	{
315	/* _FH */ BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex,
316	BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex,
317	BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex, BT uFloat16Complex, BT uFloat32Complex, BT uFloat32Complex,
318	BT FloatComplex, BT FloatComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat64Complex, BT uFloat64Complex,
319	BT DoubleComplex, BT DoubleComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat128Complex,
320	BT uFloat128Complex, BT uFloat128Complex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
321	},
322	{
323	/* _F */ BT uFloat32, BT uFloat32, BT uFloat32, BT uFloat32, BT uFloat32, BT uFloat32,
324	BT uFloat32, BT uFloat32, BT uFloat32, BT uFloat32, BT uFloat32, BT uFloat32,
325	BT uFloat32, BT uFloat32, BT uFloat32, BT uFloat32Complex, BT uFloat32, BT uFloat32Complex,
326	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
327	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
328	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
329	},
330	{
331	/* _FC */ BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex,
332	BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex,
333	BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex, BT uFloat32Complex,
334	BT FloatComplex, BT FloatComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat64Complex, BT uFloat64Complex,
335	BT DoubleComplex, BT DoubleComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat128Complex,
336	BT uFloat128Complex, BT uFloat128Complex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
337	},
338	{
339	/* F */ BT Float, BT Float, BT Float, BT Float, BT Float, BT Float,
340	BT Float, BT Float, BT Float, BT Float, BT Float, BT Float,
341	BT Float, BT Float, BT Float, BT FloatComplex, BT Float, BT FloatComplex,
342	BT Float, BT FloatComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
343	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
344	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
345	},
346	{
347	/* FC */ BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex,
348	BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex,
349	BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex, BT FloatComplex,
350	BT FloatComplex, BT FloatComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat64Complex, BT uFloat64Complex,
351	BT DoubleComplex, BT DoubleComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat128Complex,
352	BT uFloat128Complex, BT uFloat128Complex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
353	},
354	{
355	/* _FX */ BT uFloat32x, BT uFloat32x, BT uFloat32x, BT uFloat32x, BT uFloat32x, BT uFloat32x,
356	BT uFloat32x, BT uFloat32x, BT uFloat32x, BT uFloat32x, BT uFloat32x, BT uFloat32x,
357	BT uFloat32x, BT uFloat32x, BT uFloat32x, BT uFloat32xComplex, BT uFloat32x, BT uFloat32xComplex,
358	BT uFloat32x, BT uFloat32xComplex, BT uFloat32x, BT uFloat32xComplex, BT uFloat64, BT uFloat64Complex,
359	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
360	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
361	},
362	{
363	/* _FXC */ BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex,
364	BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex,
365	BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex,
366	BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat32xComplex, BT uFloat64Complex, BT uFloat64Complex,
367	BT DoubleComplex, BT DoubleComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat128Complex,
368	BT uFloat128Complex, BT uFloat128Complex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
369	},
370	{
371	/* FD */ BT uFloat64, BT uFloat64, BT uFloat64, BT uFloat64, BT uFloat64, BT uFloat64,
372	BT uFloat64, BT uFloat64, BT uFloat64, BT uFloat64, BT uFloat64, BT uFloat64,
373	BT uFloat64, BT uFloat64, BT uFloat64, BT uFloat64Complex, BT uFloat64, BT uFloat64Complex,
374	BT uFloat64, BT uFloat64Complex, BT uFloat64, BT uFloat64Complex, BT uFloat64, BT uFloat64Complex,
375	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
376	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
377	},
378	{
379	/* _FDC */ BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex,
380	BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex,
381	BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex,
382	BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex, BT uFloat64Complex,
383	BT DoubleComplex, BT DoubleComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat128Complex,
384	BT uFloat128Complex, BT uFloat128Complex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
385	},
386	{
387	/* D */ BT Double, BT Double, BT Double, BT Double, BT Double, BT Double,
388	BT Double, BT Double, BT Double, BT Double, BT Double, BT Double,
389	BT Double, BT Double, BT Double, BT DoubleComplex, BT Double, BT DoubleComplex,
390	BT Double, BT DoubleComplex, BT Double, BT DoubleComplex, BT Double, BT DoubleComplex,
391	BT Double, BT DoubleComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
392	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
393	},
394	{
395	/* DC */ BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex,
396	BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex,
397	BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex,
398	BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex, BT DoubleComplex,
399	BT DoubleComplex, BT DoubleComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat128Complex,
400	BT uFloat128Complex, BT uFloat128Complex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
401	},
402	{
403	/* F80X */ BT uFloat64x, BT uFloat64x, BT uFloat64x, BT uFloat64x, BT uFloat64x, BT uFloat64x,
404	BT uFloat64x, BT uFloat64x, BT uFloat64x, BT uFloat64x, BT uFloat64x, BT uFloat64x,
405	BT uFloat64x, BT uFloat64x, BT uFloat64x, BT uFloat64xComplex, BT uFloat64x, BT uFloat64xComplex,
406	BT uFloat64x, BT uFloat64xComplex, BT uFloat64x, BT uFloat64xComplex, BT uFloat64x, BT uFloat64xComplex,
407	BT uFloat64x, BT uFloat64xComplex, BT uFloat64x, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
408	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
409	},
410	{
411	/* _FDXC */ BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex,
412	BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex,
413	BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex,
414	BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex,
415	BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat64xComplex, BT uFloat128Complex,
416	BT uFloat128Complex, BT uFloat128Complex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
417	},
418	{
419	/* F80 */ BT uuFloat80, BT uuFloat80, BT uuFloat80, BT uuFloat80, BT uuFloat80, BT uuFloat80,
420	BT uuFloat80, BT uuFloat80, BT uuFloat80, BT uuFloat80, BT uuFloat80, BT uuFloat80,
421	BT uuFloat80, BT uuFloat80, BT uuFloat80, BT uFloat64xComplex, BT uuFloat80, BT uFloat64xComplex,
422	BT uuFloat80, BT uFloat64xComplex, BT uuFloat80, BT uFloat64xComplex, BT uuFloat80, BT uFloat64xComplex,
423	BT uuFloat80, BT uFloat64xComplex, BT uuFloat80, BT uFloat64xComplex, BT uuFloat80, BT uFloat128,
424	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
425	},
426	{
427	/* _FB */ BT uFloat128, BT uFloat128, BT uFloat128, BT uFloat128, BT uFloat128, BT uFloat128,
428	BT uFloat128, BT uFloat128, BT uFloat128, BT uFloat128, BT uFloat128, BT uFloat128,
429	BT uFloat128, BT uFloat128, BT uFloat128, BT uFloat128Complex, BT uFloat128, BT uFloat128Complex,
430	BT uFloat128, BT uFloat128Complex, BT uFloat128, BT uFloat128Complex, BT uFloat128, BT uFloat128Complex,
431	BT uFloat128, BT uFloat128Complex, BT uFloat128, BT uFloat128Complex, BT uFloat128, BT uFloat128,
432	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
433	},
434	{
435	/* _FLDC */ BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex,
436	BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex,
437	BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex,
438	BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex,
439	BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex, BT uFloat128Complex,
440	BT uFloat128Complex, BT uFloat128Complex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
441	},
442	{
443	/* FB */ BT uuFloat128, BT uuFloat128, BT uuFloat128, BT uuFloat128, BT uuFloat128, BT uuFloat128,
444	BT uuFloat128, BT uuFloat128, BT uuFloat128, BT uuFloat128, BT uuFloat128, BT uuFloat128,
445	BT uuFloat128, BT uuFloat128, BT uuFloat128, BT uFloat128Complex, BT uuFloat128, BT uFloat128Complex,
446	BT uuFloat128, BT uFloat128Complex, BT uuFloat128, BT uFloat128Complex, BT uuFloat128, BT uFloat128Complex,
447	BT uuFloat128, BT uFloat128Complex, BT uuFloat128, BT uFloat128Complex, BT uuFloat128, BT uuFloat128,
448	BT uFloat128Complex, BT uuFloat128, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
449	},
450	{
451	/* LD */ BT LongDouble, BT LongDouble, BT LongDouble, BT LongDouble, BT LongDouble, BT LongDouble,
452	BT LongDouble, BT LongDouble, BT LongDouble, BT LongDouble, BT LongDouble, BT LongDouble,
453	BT LongDouble, BT LongDouble, BT LongDouble, BT LongDoubleComplex, BT LongDouble, BT LongDoubleComplex,
454	BT LongDouble, BT LongDoubleComplex, BT LongDouble, BT LongDoubleComplex, BT LongDouble, BT LongDoubleComplex,
455	BT LongDouble, BT LongDoubleComplex, BT LongDouble, BT LongDoubleComplex, BT LongDouble, BT LongDouble,
456	BT LongDoubleComplex, BT LongDouble, BT LongDouble, BT LongDoubleComplex, BT uFloat128x, BT uFloat128xComplex,
457	},
458	{
459	/* LDC */ BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex,
460	BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex,
461	BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex,
462	BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex,
463	BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex,
464	BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT LongDoubleComplex, BT uFloat128xComplex, BT uFloat128xComplex,
465	},
466	{
467	/* _FBX */ BT uFloat128x, BT uFloat128x, BT uFloat128x, BT uFloat128x, BT uFloat128x, BT uFloat128x,
468	BT uFloat128x, BT uFloat128x, BT uFloat128x, BT uFloat128x, BT uFloat128x, BT uFloat128x,
469	BT uFloat128x, BT uFloat128x, BT uFloat128x, BT uFloat128xComplex, BT uFloat128x, BT uFloat128xComplex,
470	BT uFloat128x, BT uFloat128xComplex, BT uFloat128x, BT uFloat128xComplex, BT uFloat128x, BT uFloat128xComplex,
471	BT uFloat128x, BT uFloat128xComplex, BT uFloat128x, BT uFloat128xComplex, BT uFloat128x, BT uFloat128x,
472	BT uFloat128xComplex, BT uFloat128x, BT uFloat128x, BT uFloat128xComplex, BT uFloat128x, BT uFloat128xComplex,
473	},
474	{
475	/* _FLDXC */ BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex,
476	BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex,
477	BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex,
478	BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex,
479	BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex,
480	BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex, BT uFloat128xComplex,
481	},
482	}; // commonTypes
483	#undef BT
484	// GENERATED END
485	static_assert(
486	sizeof(commonTypes)/sizeof(commonTypes[0][0]) == BasicType::NUMBER_OF_BASIC_TYPES * BasicType::NUMBER_OF_BASIC_TYPES,
487	"Each basic type kind should have a corresponding row in the combined type matrix"
488	);
489
490	CommonType_old::CommonType_old( Type * type2, bool widenFirst, bool widenSecond, const SymTab::Indexer &indexer, TypeEnvironment &env, const OpenVarSet &openVars )
491	: result( 0 ), type2( type2 ), widenFirst( widenFirst ), widenSecond( widenSecond ), indexer( indexer ), env( env ), openVars( openVars ) {
492	}
493
494	void CommonType_old::postvisit( VoidType * ) {}
495
496	void CommonType_old::postvisit( BasicType * basicType ) {
497	if ( BasicType * otherBasic = dynamic_cast< BasicType * >( type2 ) ) {
498	BasicType::Kind newType = commonTypes[ basicType->get_kind() ][ otherBasic->get_kind() ];
499	if ( ( ( newType == basicType->get_kind() && basicType->tq >= otherBasic->tq ) \|\| widenFirst ) && ( ( newType == otherBasic->get_kind() && basicType->tq <= otherBasic->tq ) \|\| widenSecond ) ) {
500	result = new BasicType( basicType->tq \| otherBasic->tq, newType );
501	} // if
502	} else if ( dynamic_cast< ZeroType * >( type2 ) \|\| dynamic_cast< OneType * >( type2 ) ) {
503	// use signed int in lieu of the enum/zero/one type
504	BasicType::Kind newType = commonTypes[ basicType->get_kind() ][ BasicType::SignedInt ];
505	if ( ( ( newType == basicType->get_kind() && basicType->tq >= type2->tq ) \|\| widenFirst ) && ( ( newType != basicType->get_kind() && basicType->tq <= type2->tq ) \|\| widenSecond ) ) {
506	result = new BasicType( basicType->tq \| type2->tq, newType );
507	} // if
508	} else if ( const EnumInstType * enumInst = dynamic_cast< const EnumInstType * > ( type2 ) ) {
509	const EnumDecl* enumDecl = enumInst->baseEnum;
510	if ( const Type* baseType = enumDecl->base ) {
511	result = baseType->clone();
512	} else {
513	BasicType::Kind newType = commonTypes[ basicType->get_kind() ][ BasicType::SignedInt ];
514	if ( ( ( newType == basicType->get_kind() && basicType->tq >= type2->tq ) \|\| widenFirst ) && ( ( newType != basicType->get_kind() && basicType->tq <= type2->tq ) \|\| widenSecond ) ) {
515	result = new BasicType( basicType->tq \| type2->tq, newType );
516	} // if
517	}
518	}
519	}
520
521	template< typename Pointer >
522	void CommonType_old::getCommonWithVoidPointer( Pointer * voidPointer, Pointer * otherPointer ) {
523	if ( TypeInstType * var = dynamic_cast< TypeInstType * >( otherPointer->get_base() ) ) {
524	OpenVarSet::const_iterator entry = openVars.find( var->get_name() );
525	if ( entry != openVars.end() ) {
526	AssertionSet need, have;
527	WidenMode widen( widenFirst, widenSecond );
528	if ( entry != openVars.end() && ! env.bindVar(var, voidPointer->get_base(), entry->second, need, have, openVars, widen, indexer ) ) return;
529	}
530	}
531	result = voidPointer->clone();
532	result->tq \|= otherPointer->tq;
533	}
534
535	void CommonType_old::postvisit( PointerType * pointerType ) {
536	if ( PointerType * otherPointer = dynamic_cast< PointerType * >( type2 ) ) {
537	// std::cerr << "commonType: two pointers: " << pointerType << " / " << otherPointer << std::endl;
538	if ( widenFirst && dynamic_cast< VoidType * >( otherPointer->get_base() ) && ! isFtype(pointerType->get_base()) ) {
539	getCommonWithVoidPointer( otherPointer, pointerType );
540	} else if ( widenSecond && dynamic_cast< VoidType * >( pointerType->get_base() ) && ! isFtype(otherPointer->get_base()) ) {
541	getCommonWithVoidPointer( pointerType, otherPointer );
542	} else if ( ( pointerType->get_base()->tq >= otherPointer->get_base()->tq \|\| widenFirst )
543	&& ( pointerType->get_base()->tq <= otherPointer->get_base()->tq \|\| widenSecond ) ) {
544	// std::cerr << "middle case" << std::endl;
545	Type::Qualifiers tq1 = pointerType->get_base()->tq, tq2 = otherPointer->get_base()->tq;
546	pointerType->get_base()->tq = Type::Qualifiers();
547	otherPointer->get_base()->tq = Type::Qualifiers();
548	AssertionSet have, need;
549	OpenVarSet newOpen( openVars );
550	if ( unifyExact( pointerType->get_base(), otherPointer->get_base(), env, have, need, newOpen, indexer ) ) {
551	// std::cerr << "unifyExact success" << std::endl;
552	if ( tq1 < tq2 ) {
553	result = pointerType->clone();
554	} else {
555	result = otherPointer->clone();
556	} // if
557	strict_dynamic_cast<PointerType *>(result)->base->tq = tq1 \| tq2;
558	} else {
559	/// std::cerr << "place for ptr-to-type" << std::endl;
560	} // if
561	pointerType->get_base()->tq = tq1;
562	otherPointer->get_base()->tq = tq2;
563	} // if
564	} else if ( widenSecond && dynamic_cast< ZeroType * >( type2 ) ) {
565	result = pointerType->clone();
566	result->tq \|= type2->tq;
567	} // if
568	}
569
570	void CommonType_old::postvisit( ArrayType * ) {}
571
572	void CommonType_old::postvisit( ReferenceType * refType ) {
573	if ( ReferenceType * otherRef = dynamic_cast< ReferenceType * >( type2 ) ) {
574	// std::cerr << "commonType: both references: " << refType << " / " << otherRef << std::endl;
575	// std::cerr << ( refType->get_base()->tq >= otherRef->get_base()->tq \|\| widenFirst ) << (refType->get_base()->tq <= otherRef->get_base()->tq \|\| widenSecond) << std::endl;
576	if ( widenFirst && dynamic_cast< VoidType * >( otherRef->get_base() ) && ! isFtype(refType->get_base()) ) {
577	getCommonWithVoidPointer( otherRef, refType );
578	} else if ( widenSecond && dynamic_cast< VoidType * >( refType->get_base() ) && ! isFtype(otherRef->get_base()) ) {
579	getCommonWithVoidPointer( refType, otherRef );
580	} else if ( ( refType->get_base()->tq >= otherRef->get_base()->tq \|\| widenFirst )
581	&& ( refType->get_base()->tq <= otherRef->get_base()->tq \|\| widenSecond ) ) {
582	// std::cerr << "middle case" << std::endl;
583	Type::Qualifiers tq1 = refType->get_base()->tq, tq2 = otherRef->get_base()->tq;
584	refType->get_base()->tq = Type::Qualifiers();
585	otherRef->get_base()->tq = Type::Qualifiers();
586	AssertionSet have, need;
587	OpenVarSet newOpen( openVars );
588	if ( unifyExact( refType->get_base(), otherRef->get_base(), env, have, need, newOpen, indexer ) ) {
589	if ( tq1 < tq2 ) {
590	result = refType->clone();
591	} else {
592	result = otherRef->clone();
593	} // if
594	strict_dynamic_cast<ReferenceType *>(result)->base->tq = tq1 \| tq2;
595	} else {
596	/// std::cerr << "place for ptr-to-type" << std::endl;
597	} // if
598	refType->get_base()->tq = tq1;
599	otherRef->get_base()->tq = tq2;
600	} // if
601	} else if ( widenSecond && dynamic_cast< ZeroType * >( type2 ) ) {
602	result = refType->clone();
603	result->tq \|= type2->tq;
604	} // if
605	}
606
607	void CommonType_old::postvisit( FunctionType * ) {}
608	void CommonType_old::postvisit( StructInstType * ) {}
609	void CommonType_old::postvisit( UnionInstType * ) {}
610
611	void CommonType_old::postvisit( EnumInstType * enumInstType ) {
612	if ( dynamic_cast< BasicType * >( type2 ) \|\| dynamic_cast< ZeroType * >( type2 ) \|\| dynamic_cast< OneType * >( type2 ) ) {
613	// reuse BasicType, EnumInstType code by swapping type2 with enumInstType
614	result = commonType( type2, enumInstType, widenSecond, widenFirst, indexer, env, openVars );
615	} // if
616	}
617
618	void CommonType_old::postvisit( TraitInstType * ) {
619	}
620
621	void CommonType_old::postvisit( TypeInstType * inst ) {
622	if ( widenFirst ) {
623	const NamedTypeDecl * nt = indexer.lookupType( inst->get_name() );
624	if ( nt ) {
625	const TypeDecl * type = strict_dynamic_cast< const TypeDecl * >( nt );
626	if ( type->get_base() ) {
627	Type::Qualifiers tq1 = inst->tq, tq2 = type2->tq;
628	AssertionSet have, need;
629	OpenVarSet newOpen( openVars );
630	type2->tq = Type::Qualifiers();
631	type->get_base()->tq = tq1;
632	if ( unifyExact( type->get_base(), type2, env, have, need, newOpen, indexer ) ) {
633	result = type2->clone();
634	result->tq = tq1 \| tq2;
635	} // if
636	type2->tq = tq2;
637	type->get_base()->tq = Type::Qualifiers();
638	} // if
639	} // if
640	} // if
641	}
642
643	void CommonType_old::postvisit( TupleType * ) {}
644	void CommonType_old::postvisit( VarArgsType * ) {}
645
646	void CommonType_old::postvisit( ZeroType * zeroType ) {
647	if ( widenFirst ) {
648	if ( dynamic_cast< BasicType * >( type2 ) \|\| dynamic_cast< PointerType * >( type2 ) \|\| dynamic_cast< EnumInstType * >( type2 ) ) {
649	if ( widenSecond \|\| zeroType->tq <= type2->tq ) {
650	result = type2->clone();
651	result->tq \|= zeroType->tq;
652	}
653	} else if ( widenSecond && dynamic_cast< OneType * >( type2 ) ) {
654	result = new BasicType( zeroType->tq, BasicType::SignedInt );
655	result->tq \|= type2->tq;
656	}
657	}
658	}
659
660	void CommonType_old::postvisit( OneType * oneType ) {
661	if ( widenFirst ) {
662	if ( dynamic_cast< BasicType * >( type2 ) \|\| dynamic_cast< EnumInstType * >( type2 ) ) {
663	if ( widenSecond \|\| oneType->tq <= type2->tq ) {
664	result = type2->clone();
665	result->tq \|= oneType->tq;
666	}
667	} else if ( widenSecond && dynamic_cast< ZeroType * >( type2 ) ) {
668	result = new BasicType( oneType->tq, BasicType::SignedInt );
669	result->tq \|= type2->tq;
670	}
671	}
672	}
673
674	class CommonType_new final : public ast::WithShortCircuiting {
675	const ast::Type * type2;
676	WidenMode widen;
677	const ast::SymbolTable & symtab;
678	ast::TypeEnvironment & tenv;
679	const ast::OpenVarSet & open;
680	ast::AssertionSet & need;
681	ast::AssertionSet & have;
682	public:
683	static size_t traceId;
684	ast::ptr< ast::Type > result;
685
686	CommonType_new(
687	const ast::Type * t2, WidenMode w, const ast::SymbolTable & st,
688	ast::TypeEnvironment & env, const ast::OpenVarSet & o,
689	ast::AssertionSet & need, ast::AssertionSet & have )
690	: type2( t2 ), widen( w ), symtab( st ), tenv( env ), open( o ), need (need), have (have) ,result() {}
691
692	void previsit( const ast::Node * ) { visit_children = false; }
693
694	void postvisit( const ast::VoidType * ) {}
695
696	void postvisit( const ast::BasicType * basic ) {
697	if ( auto basic2 = dynamic_cast< const ast::BasicType * >( type2 ) ) {
698	#warning remove casts when `commonTypes` moved to new AST
699	ast::BasicType::Kind kind = (ast::BasicType::Kind)(int)commonTypes[ (BasicType::Kind)(int)basic->kind ][ (BasicType::Kind)(int)basic2->kind ];
700	if (
701	( ( kind == basic->kind && basic->qualifiers >= basic2->qualifiers )
702	\|\| widen.first )
703	&& ( ( kind == basic2->kind && basic->qualifiers <= basic2->qualifiers )
704	\|\| widen.second )
705	) {
706	result = new ast::BasicType{ kind, basic->qualifiers \| basic2->qualifiers };
707	}
708	} else if (
709	dynamic_cast< const ast::ZeroType * >( type2 )
710	\|\| dynamic_cast< const ast::OneType * >( type2 )
711	) {
712	#warning remove casts when `commonTypes` moved to new AST
713	ast::BasicType::Kind kind = (ast::BasicType::Kind)(int)commonTypes[ (BasicType::Kind)(int)basic->kind ][ (BasicType::Kind)(int)ast::BasicType::SignedInt ];
714	if (
715	( ( kind == basic->kind && basic->qualifiers >= type2->qualifiers )
716	\|\| widen.first )
717	&& ( ( kind != basic->kind && basic->qualifiers <= type2->qualifiers )
718	\|\| widen.second )
719	) {
720	result = new ast::BasicType{ kind, basic->qualifiers \| type2->qualifiers };
721	}
722	} else if ( const ast::EnumInstType * enumInst = dynamic_cast< const ast::EnumInstType * >( type2 ) ) {
723	#warning remove casts when `commonTypes` moved to new AST
724	const ast::EnumDecl* enumDecl = enumInst->base;
725	if ( enumDecl->base ) {
726	result = enumDecl->base.get();
727	} else {
728	ast::BasicType::Kind kind = (ast::BasicType::Kind)(int)commonTypes[ (BasicType::Kind)(int)basic->kind ][ (BasicType::Kind)(int)ast::BasicType::SignedInt ];
729	if (
730	( ( kind == basic->kind && basic->qualifiers >= type2->qualifiers )
731	\|\| widen.first )
732	&& ( ( kind != basic->kind && basic->qualifiers <= type2->qualifiers )
733	\|\| widen.second )
734	) {
735	result = new ast::BasicType{ kind, basic->qualifiers \| type2->qualifiers };
736	}
737	}
738	}
739	}
740
741	private:
742	template< typename Pointer >
743	void getCommonWithVoidPointer( const Pointer * voidPtr, const Pointer * oPtr ) {
744	const ast::Type * base = oPtr->base;
745	if ( auto var = dynamic_cast< const ast::TypeInstType * >( base ) ) {
746	auto entry = open.find( *var );
747	if ( entry != open.end() ) {
748	ast::AssertionSet need, have;
749	if ( ! tenv.bindVar(
750	var, voidPtr->base, entry->second, need, have, open, widen, symtab )
751	) return;
752	}
753	}
754	result = voidPtr;
755	add_qualifiers( result, oPtr->qualifiers );
756	}
757
758	// For a typed enum, we want to unify type1 with the base type of the enum
759	bool tryResolveWithTypedEnum( const ast::Type * type1 ) {
760	if (auto enumInst = dynamic_cast<const ast::EnumInstType *> (type2) ) {
761	ast::OpenVarSet newOpen{ open };
762	if (enumInst->base->base
763	&& unifyExact(type1, enumInst->base->base, tenv, need, have, newOpen, widen, symtab)) {
764	result = type1;
765	return true;
766	}
767	}
768	return false;
769	}
770
771	public:
772	void postvisit( const ast::PointerType * pointer ) {
773	if ( auto pointer2 = dynamic_cast< const ast::PointerType * >( type2 ) ) {
774	if (
775	widen.first
776	&& pointer2->base.as< ast::VoidType >()
777	&& ! ast::isFtype( pointer->base )
778	) {
779	getCommonWithVoidPointer( pointer2, pointer );
780	} else if (
781	widen.second
782	&& pointer->base.as< ast::VoidType >()
783	&& ! ast::isFtype( pointer2->base )
784	) {
785	getCommonWithVoidPointer( pointer, pointer2 );
786	} else if (
787	( pointer->base->qualifiers >= pointer2->base->qualifiers \|\| widen.first )
788	&& ( pointer->base->qualifiers <= pointer2->base->qualifiers \|\| widen.second )
789	) {
790	ast::CV::Qualifiers q1 = pointer->base->qualifiers;
791	ast::CV::Qualifiers q2 = pointer2->base->qualifiers;
792
793	// force t{1,2} to be cloned if their qualifiers must be stripped, so that
794	// pointer{,2}->base are unchanged
795	ast::ptr< ast::Type > t1{ pointer->base }, t2{ pointer2->base };
796	reset_qualifiers( t1 );
797	reset_qualifiers( t2 );
798
799	ast::OpenVarSet newOpen{ open };
800	if ( unifyExact( t1, t2, tenv, have, need, newOpen, noWiden(), symtab ) ) {
801	result = pointer;
802	if ( q1.val != q2.val ) {
803	// reset result->base->qualifiers to be union of two base qualifiers
804	strict_dynamic_cast< ast::PointerType * >(
805	result.get_and_mutate()
806	)->base.get_and_mutate()->qualifiers = q1 \| q2;
807	}
808	}
809	else if ( isFtype (t1) && isFtype (t2) ) {
810	auto f1 = t1.as<ast::FunctionType>();
811	if (!f1) return;
812	auto f2 = t2.strict_as<ast::FunctionType>();
813
814	assertf(f1->returns.size() <= 1, "Function return should not be a list");
815	assertf(f2->returns.size() <= 1, "Function return should not be a list");
816
817	if (
818	( f1->params.size() != f2->params.size() \|\| f1->returns.size() != f2->returns.size() )
819	&& ! f1->isTtype()
820	&& ! f2->isTtype()
821	) return;
822
823	auto params1 = flattenList( f1->params, tenv );
824	auto params2 = flattenList( f2->params, tenv );
825
826	auto crnt1 = params1.begin();
827	auto crnt2 = params2.begin();
828	auto end1 = params1.end();
829	auto end2 = params2.end();
830
831	while (crnt1 != end1 && crnt2 != end2 ) {
832	const ast::Type * arg1 = *crnt1;
833	const ast::Type * arg2 = *crnt2;
834
835	bool isTuple1 = Tuples::isTtype( t1 );
836	bool isTuple2 = Tuples::isTtype( t2 );
837
838	// assumes here that ttype must be last parameter
839	if ( isTuple1 && ! isTuple2 ) {
840	// combine remainder of list2, then unify
841	if (unifyExact(
842	arg1, tupleFromTypes( crnt2, end2 ), tenv, need, have, open,
843	noWiden(), symtab )) {
844	break;
845
846	}
847	else return;
848	} else if ( ! isTuple1 && isTuple2 ) {
849	// combine remainder of list1, then unify
850	if (unifyExact(
851	tupleFromTypes( crnt1, end1 ), arg2, tenv, need, have, open,
852	noWiden(), symtab )) {
853	break;
854
855	}
856	else return;
857	}
858
859	// allow qualifiers of pointer and reference base to become more specific
860	if (auto ref1 = dynamic_cast<const ast::ReferenceType *> (arg1)) {
861	if (auto ref2 = dynamic_cast<const ast::ReferenceType *> (arg2)) {
862	ast::ptr<ast::Type> base1 = ref1->base;
863	ast::ptr<ast::Type> base2 = ref2->base;
864
865	// xxx - assume LHS is always the target type
866
867	if ( ! ((widen.second && ref2->qualifiers.is_mutex)
868	\|\| (ref1->qualifiers.is_mutex == ref2->qualifiers.is_mutex ))) return;
869
870	if ( (widen.second && base1->qualifiers <= base2->qualifiers ) \|\| (base2->qualifiers == base1->qualifiers) ) {
871
872	reset_qualifiers(base1);
873	reset_qualifiers(base2);
874
875	if ( ! unifyExact(
876	base1, base2, tenv, need, have, open, noWiden(), symtab )
877	) return;
878	}
879	}
880	else return;
881	}
882	else if (auto ptr1 = dynamic_cast<const ast::PointerType *> (arg1)) {
883	if (auto ptr2 = dynamic_cast<const ast::PointerType *> (arg2)) {
884	ast::ptr<ast::Type> base1 = ptr1->base;
885	ast::ptr<ast::Type> base2 = ptr2->base;
886
887	// xxx - assume LHS is always the target type
888	// a function accepting const can always be called by non-const arg
889
890	if ( (widen.second && base1->qualifiers <= base2->qualifiers ) \|\| (base2->qualifiers == base1->qualifiers) ) {
891
892	reset_qualifiers(base1);
893	reset_qualifiers(base2);
894
895	if ( ! unifyExact(
896	base1, base2, tenv, need, have, open, noWiden(), symtab )
897	) return;
898	}
899	}
900	else return;
901
902	}
903	else if (! unifyExact(
904	arg1, arg2, tenv, need, have, open, noWiden(), symtab )) return;
905
906	++crnt1; ++crnt2;
907	}
908	if ( crnt1 != end1 ) {
909	// try unifying empty tuple with ttype
910	const ast::Type * t1 = *crnt1;
911	if (! Tuples::isTtype( t1 ) ) return;
912	if (! unifyExact(
913	t1, tupleFromTypes( crnt2, end2 ), tenv, need, have, open,
914	noWiden(), symtab )) return;
915	} else if ( crnt2 != end2 ) {
916	// try unifying empty tuple with ttype
917	const ast::Type * t2 = *crnt2;
918	if (! Tuples::isTtype( t2 ) ) return;
919	if (! unifyExact(
920	tupleFromTypes( crnt1, end1 ), t2, tenv, need, have, open,
921	noWiden(), symtab )) return;
922	}
923	if ((f1->returns.size() == 0 && f2->returns.size() == 0)
924	\|\| (f1->returns.size() == 1 && f2->returns.size() == 1 && unifyExact(f1->returns[0], f2->returns[0], tenv, need, have, open, noWiden(), symtab))) {
925	result = pointer;
926
927	for (auto & assn : f1->assertions) {
928	auto i = need.find(assn);
929	if (i != need.end()) i->second.isUsed = true;
930	auto j = have.find(assn);
931	if (j != have.end()) j->second.isUsed = true;
932	}
933
934	for (auto & assn : f2->assertions) {
935	auto i = need.find(assn);
936	if (i != need.end()) i->second.isUsed = true;
937	auto j = have.find(assn);
938	if (j != have.end()) j->second.isUsed = true;
939	}
940
941	}
942	} // if ftype
943
944	}
945	} else if ( widen.second && dynamic_cast< const ast::ZeroType * >( type2 ) ) {
946	result = pointer;
947	add_qualifiers( result, type2->qualifiers );
948	} else {
949	tryResolveWithTypedEnum( pointer );
950	}
951	}
952
953	void postvisit( const ast::ArrayType * arr ) {
954	// xxx - does it make sense?
955	tryResolveWithTypedEnum( arr );
956	}
957
958	void postvisit( const ast::ReferenceType * ref ) {
959	if ( auto ref2 = dynamic_cast< const ast::ReferenceType * >( type2 ) ) {
960	if (
961	widen.first && ref2->base.as< ast::VoidType >() && ! ast::isFtype( ref->base )
962	) {
963	getCommonWithVoidPointer( ref2, ref );
964	} else if (
965	widen.second && ref->base.as< ast::VoidType>() && ! ast::isFtype( ref2->base )
966	) {
967	getCommonWithVoidPointer( ref, ref2 );
968	} else if (
969	( ref->base->qualifiers >= ref2->base->qualifiers \|\| widen.first )
970	&& ( ref->base->qualifiers <= ref2->base->qualifiers \|\| widen.second )
971	) {
972	ast::CV::Qualifiers q1 = ref->base->qualifiers, q2 = ref2->base->qualifiers;
973
974	// force t{1,2} to be cloned if their qualifiers must be stripped, so that
975	// ref{,2}->base are unchanged
976	ast::ptr< ast::Type > t1{ ref->base }, t2{ ref2->base };
977	reset_qualifiers( t1 );
978	reset_qualifiers( t2 );
979
980	ast::OpenVarSet newOpen{ open };
981	if ( unifyExact( t1, t2, tenv, have, need, newOpen, noWiden(), symtab ) ) {
982	result = ref;
983	if ( q1.val != q2.val ) {
984	// reset result->base->qualifiers to be union of two base qualifiers
985	strict_dynamic_cast< ast::ReferenceType * >(
986	result.get_and_mutate()
987	)->base.get_and_mutate()->qualifiers = q1 \| q2;
988	}
989	}
990	}
991	} else if ( widen.second && dynamic_cast< const ast::ZeroType * >( type2 ) ) {
992	result = ref;
993	add_qualifiers( result, type2->qualifiers );
994	} else {
995	if (!dynamic_cast<const ast::EnumInstType *>(type2))
996	result = commonType( type2, ref, tenv, need, have, open, widen, symtab );
997	}
998	}
999
1000	void postvisit( const ast::FunctionType * func) {
1001	tryResolveWithTypedEnum( func );
1002	}
1003
1004	void postvisit( const ast::StructInstType * inst ) {
1005	tryResolveWithTypedEnum( inst );
1006	}
1007
1008	void postvisit( const ast::UnionInstType * inst ) {
1009	tryResolveWithTypedEnum( inst );
1010	}
1011
1012	void postvisit( const ast::EnumInstType * enumInst ) {
1013	if (!dynamic_cast<const ast::EnumInstType *>(type2))
1014	result = commonType( type2, enumInst, tenv, need, have, open, widen, symtab);
1015	}
1016
1017	void postvisit( const ast::TraitInstType * ) {}
1018
1019	void postvisit( const ast::TypeInstType * inst ) {
1020	if ( ! widen.first ) return;
1021	if ( const ast::NamedTypeDecl * nt = symtab.lookupType( inst->name ) ) {
1022	if ( const ast::Type * base =
1023	strict_dynamic_cast< const ast::TypeDecl * >( nt )->base
1024	) {
1025	ast::CV::Qualifiers q1 = inst->qualifiers, q2 = type2->qualifiers;
1026
1027	// force t{1,2} to be cloned if their qualifiers must be mutated
1028	ast::ptr< ast::Type > t1{ base }, t2{ type2 };
1029	reset_qualifiers( t1, q1 );
1030	reset_qualifiers( t2 );
1031
1032	ast::OpenVarSet newOpen{ open };
1033	if ( unifyExact( t1, t2, tenv, have, need, newOpen, noWiden(), symtab ) ) {
1034	result = type2;
1035	reset_qualifiers( result, q1 \| q2 );
1036	} else {
1037	tryResolveWithTypedEnum( t1 );
1038	}
1039	}
1040	}
1041	}
1042
1043	void postvisit( const ast::TupleType * tuple) {
1044	tryResolveWithTypedEnum( tuple );
1045	}
1046
1047	void postvisit( const ast::VarArgsType * ) {}
1048
1049	void postvisit( const ast::ZeroType * zero ) {
1050	if ( ! widen.first ) return;
1051	if ( dynamic_cast< const ast::BasicType * >( type2 )
1052	\|\| dynamic_cast< const ast::PointerType * >( type2 ) ) {
1053	if ( widen.second \|\| zero->qualifiers <= type2->qualifiers ) {
1054	result = type2;
1055	add_qualifiers( result, zero->qualifiers );
1056	}
1057	} else if ( widen.second && dynamic_cast< const ast::OneType * >( type2 ) ) {
1058	result = new ast::BasicType{
1059	ast::BasicType::SignedInt, zero->qualifiers \| type2->qualifiers };
1060	} else if ( const ast::EnumInstType * enumInst = dynamic_cast< const ast::EnumInstType * >( type2 ) ) {
1061	const ast::EnumDecl * enumDecl = enumInst->base;
1062	if ( enumDecl->base ) {
1063	if ( tryResolveWithTypedEnum( zero ) )
1064	add_qualifiers( result, zero->qualifiers );
1065	} else {
1066	if ( widen.second \|\| zero->qualifiers <= type2->qualifiers ) {
1067	result = type2;
1068	add_qualifiers( result, zero->qualifiers );
1069	}
1070	}
1071	}
1072	}
1073
1074	void postvisit( const ast::OneType * one ) {
1075	if ( ! widen.first ) return;
1076	if ( dynamic_cast< const ast::BasicType * >( type2 ) ) {
1077	if ( widen.second \|\| one->qualifiers <= type2->qualifiers ) {
1078	result = type2;
1079	add_qualifiers( result, one->qualifiers );
1080	}
1081	} else if ( widen.second && dynamic_cast< const ast::ZeroType * >( type2 ) ) {
1082	result = new ast::BasicType{
1083	ast::BasicType::SignedInt, one->qualifiers \| type2->qualifiers };
1084	} else if ( const ast::EnumInstType * enumInst = dynamic_cast< const ast::EnumInstType * >( type2 ) ) {
1085	const ast::EnumDecl * enumBase = enumInst->base;
1086	if ( enumBase->base ) {
1087	if ( tryResolveWithTypedEnum( one ))
1088	add_qualifiers( result, one->qualifiers );
1089	} else {
1090	if ( widen.second \|\| one->qualifiers <= type2->qualifiers ) {
1091	result = type2;
1092	add_qualifiers( result, one->qualifiers );
1093	}
1094	}
1095	}
1096	}
1097
1098	};
1099
1100	// size_t CommonType_new::traceId = Stats::Heap::new_stacktrace_id("CommonType_new");
1101	namespace {
1102	ast::ptr< ast::Type > handleReference(
1103	const ast::ptr< ast::Type > & t1, const ast::ptr< ast::Type > & t2, WidenMode widen,
1104	const ast::SymbolTable & symtab, ast::TypeEnvironment & env,
1105	const ast::OpenVarSet & open
1106	) {
1107	ast::ptr<ast::Type> common;
1108	ast::AssertionSet have, need;
1109	ast::OpenVarSet newOpen{ open };
1110
1111	// need unify to bind type variables
1112	if ( unify( t1, t2, env, have, need, newOpen, symtab, common ) ) {
1113	ast::CV::Qualifiers q1 = t1->qualifiers, q2 = t2->qualifiers;
1114	PRINT(
1115	std::cerr << "unify success: " << widenFirst << " " << widenSecond << std::endl;
1116	)
1117	if ( ( widen.first \|\| q2 <= q1 ) && ( widen.second \|\| q1 <= q2 ) ) {
1118	PRINT(
1119	std::cerr << "widen okay" << std::endl;
1120	)
1121	add_qualifiers( common, q1 \| q2 );
1122	return common;
1123	}
1124	}
1125
1126	PRINT(
1127	std::cerr << "exact unify failed: " << t1 << " " << t2 << std::endl;
1128	)
1129	return { nullptr };
1130	}
1131	}
1132
1133	ast::ptr< ast::Type > commonType(
1134	const ast::ptr< ast::Type > & type1, const ast::ptr< ast::Type > & type2,
1135	ast::TypeEnvironment & env, ast::AssertionSet & need, ast::AssertionSet & have,
1136	const ast::OpenVarSet & open, WidenMode widen, const ast::SymbolTable & symtab
1137	) {
1138	unsigned depth1 = type1->referenceDepth();
1139	unsigned depth2 = type2->referenceDepth();
1140
1141	if ( depth1 != depth2 ) { // implies depth1 > 0 \|\| depth2 > 0
1142	PRINT(
1143	std::cerr << "reference depth diff: " << (depth1-depth2) << std::endl;
1144	)
1145	ast::ptr< ast::Type > result;
1146	const ast::ReferenceType * ref1 = type1.as< ast::ReferenceType >();
1147	const ast::ReferenceType * ref2 = type2.as< ast::ReferenceType >();
1148
1149	if ( depth1 > depth2 ) {
1150	assert( ref1 );
1151	result = handleReference( ref1->base, type2, widen, symtab, env, open );
1152	} else { // implies depth1 < depth2
1153	assert( ref2 );
1154	result = handleReference( type1, ref2->base, widen, symtab, env, open );
1155	}
1156
1157	if ( result && ref1 ) {
1158	// formal is reference, so result should be reference
1159	PRINT(
1160	std::cerr << "formal is reference; result should be reference" << std::endl;
1161	)
1162	result = new ast::ReferenceType{ result, ref1->qualifiers };
1163	}
1164
1165	PRINT(
1166	std::cerr << "common type of reference [" << type1 << "] and [" << type2 << "] is "
1167	"[" << result << "]" << std::endl;
1168	)
1169	return result;
1170	}
1171	// otherwise both are reference types of the same depth and this is handled by the visitor
1172	ast::Pass<CommonType_new> visitor{ type2, widen, symtab, env, open, need, have };
1173	type1->accept( visitor );
1174	ast::ptr< ast::Type > result = visitor.core.result;
1175
1176	// handling for opaque type declarations (?)
1177	if ( ! result && widen.second ) {
1178	if ( const ast::TypeInstType * inst = type2.as< ast::TypeInstType >() ) {
1179	if ( const ast::NamedTypeDecl * nt = symtab.lookupType( inst->name ) ) {
1180	auto type = strict_dynamic_cast< const ast::TypeDecl * >( nt );
1181	if ( type->base ) {
1182	ast::CV::Qualifiers q1 = type1->qualifiers, q2 = type2->qualifiers;
1183	ast::OpenVarSet newOpen{ open };
1184
1185	// force t{1,2} to be cloned if its qualifiers must be stripped, so that
1186	// type1 and type->base are left unchanged; calling convention forces
1187	// {type1,type->base}->strong_ref >= 1
1188	ast::ptr<ast::Type> t1{ type1 }, t2{ type->base };
1189	reset_qualifiers( t1 );
1190	reset_qualifiers( t2, q1 );
1191
1192	if ( unifyExact( t1, t2, env, have, need, newOpen, noWiden(), symtab ) ) {
1193	result = t1;
1194	reset_qualifiers( result, q1 \| q2 );
1195	}
1196	}
1197	}
1198	}
1199	}
1200
1201	return result;
1202	}
1203
1204	} // namespace ResolvExpr
1205
1206	// Local Variables: //
1207	// tab-width: 4 //
1208	// mode: c++ //
1209	// compile-command: "make install" //
1210	// End: //

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