source: src/SymTab/Autogen.h @ 837ce06

ADTarm-ehast-experimentalcleanup-dtorsenumforall-pointer-decayjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprpthread-emulationqualifiedEnum
Last change on this file since 837ce06 was 837ce06, checked in by Rob Schluntz <rschlunt@…>, 6 years ago

Fix cleanup function generation to always generate monomorphic functions

  • Property mode set to 100644
File size: 9.7 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// Autogen.h --
8//
9// Author           : Rob Schluntz
10// Created On       : Sun May 17 21:53:34 2015
11// Last Modified By : Peter A. Buhr
12// Last Modified On : Sat Jul 22 09:50:25 2017
13// Update Count     : 15
14//
15
16#pragma once
17
18#include <cassert>                // for assert
19#include <string>                 // for string
20
21#include "CodeGen/OperatorTable.h"
22#include "Common/UniqueName.h"    // for UniqueName
23#include "InitTweak/InitTweak.h"  // for InitExpander
24#include "SynTree/Constant.h"     // for Constant
25#include "SynTree/Declaration.h"  // for DeclarationWithType, ObjectDecl
26#include "SynTree/Expression.h"   // for NameExpr, ConstantExpr, UntypedExpr...
27#include "SynTree/Type.h"         // for Type, ArrayType, Type::Qualifiers
28
29class CompoundStmt;
30class Statement;
31
32namespace SymTab {
33        /// Generates assignment operators, constructors, and destructor for aggregate types as required
34        void autogenerateRoutines( std::list< Declaration * > &translationUnit );
35
36        /// returns true if obj's name is the empty string and it has a bitfield width
37        bool isUnnamedBitfield( ObjectDecl * obj );
38
39        /// size_t type - set when size_t typedef is seen. Useful in a few places,
40        /// such as in determining array dimension type
41        extern Type * SizeType;
42
43        /// intrinsic dereference operator for unqualified types - set when *? function is seen in FindSpecialDeclarations.
44        /// Useful for creating dereference ApplicationExprs without a full resolver pass.
45        extern FunctionDecl * dereferenceOperator;
46
47        /// generate the type of an assignment function for paramType.
48        /// maybePolymorphic is true if the resulting FunctionType is allowed to be polymorphic
49        FunctionType * genAssignType( Type * paramType, bool maybePolymorphic = true );
50
51        /// generate the type of a default constructor or destructor for paramType.
52        /// maybePolymorphic is true if the resulting FunctionType is allowed to be polymorphic
53        FunctionType * genDefaultType( Type * paramType, bool maybePolymorphic = true );
54
55        /// generate the type of a copy constructor for paramType.
56        /// maybePolymorphic is true if the resulting FunctionType is allowed to be polymorphic
57        FunctionType * genCopyType( Type * paramType, bool maybePolymorphic = true );
58
59        /// inserts into out a generated call expression to function fname with arguments dstParam and srcParam. Intended to be used with generated ?=?, ?{}, and ^?{} calls.
60        template< typename OutputIterator >
61        Statement * genCall( InitTweak::InitExpander & srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, Type * type, bool addCast = false, bool forward = true );
62
63        /// inserts into out a generated call expression to function fname with arguments dstParam and srcParam. Should only be called with non-array types.
64        /// optionally returns a statement which must be inserted prior to the containing loop, if there is one
65        template< typename OutputIterator >
66        Statement * genScalarCall( InitTweak::InitExpander & srcParam, Expression * dstParam, std::string fname, OutputIterator out, Type * type, bool addCast = false ) {
67                bool isReferenceCtorDtor = false;
68                if ( dynamic_cast< ReferenceType * >( type ) && CodeGen::isCtorDtor( fname ) ) {
69                        // reference constructors are essentially application of the rebind operator.
70                        // apply & to both arguments, do not need a cast
71                        fname = "?=?";
72                        dstParam = new AddressExpr( dstParam );
73                        addCast = false;
74                        isReferenceCtorDtor = true;
75                }
76
77                // want to be able to generate assignment, ctor, and dtor generically,
78                // so fname is either ?=?, ?{}, or ^?{}
79                UntypedExpr * fExpr = new UntypedExpr( new NameExpr( fname ) );
80
81                if ( addCast ) {
82                        // cast to T& with qualifiers removed, so that qualified objects can be constructed
83                        // and destructed with the same functions as non-qualified objects.
84                        // unfortunately, lvalue is considered a qualifier. For AddressExpr to resolve, its argument
85                        // must have an lvalue qualified type, so remove all qualifiers except lvalue. If we ever
86                        // remove lvalue as a qualifier, this can change to
87                        //   type->get_qualifiers() = Type::Qualifiers();
88                        assert( type );
89                        Type * castType = type->clone();
90                        castType->get_qualifiers() -= Type::Qualifiers( Type::Lvalue | Type::Const | Type::Volatile | Type::Restrict | Type::Atomic );
91                        // castType->set_lvalue( true ); // xxx - might not need this
92                        dstParam = new CastExpr( dstParam, new ReferenceType( Type::Qualifiers(), castType ) );
93                }
94                fExpr->args.push_back( dstParam );
95
96                Statement * listInit = srcParam.buildListInit( fExpr );
97
98                // fetch next set of arguments
99                ++srcParam;
100
101                // return if adding reference fails - will happen on default constructor and destructor
102                if ( isReferenceCtorDtor && ! srcParam.addReference() ) {
103                        delete fExpr;
104                        return listInit;
105                }
106
107                std::list< Expression * > args = *srcParam;
108                fExpr->args.splice( fExpr->args.end(), args );
109
110                *out++ = new ExprStmt( noLabels, fExpr );
111
112                srcParam.clearArrayIndices();
113
114                return listInit;
115        }
116
117        /// Store in out a loop which calls fname on each element of the array with srcParam and dstParam as arguments.
118        /// If forward is true, loop goes from 0 to N-1, else N-1 to 0
119        template< typename OutputIterator >
120        void genArrayCall( InitTweak::InitExpander & srcParam, Expression *dstParam, const std::string & fname, OutputIterator out, ArrayType *array, bool addCast = false, bool forward = true ) {
121                static UniqueName indexName( "_index" );
122
123                // for a flexible array member nothing is done -- user must define own assignment
124                if ( ! array->get_dimension() ) return ;
125
126                Expression * begin, * end, * update, * cmp;
127                if ( forward ) {
128                        // generate: for ( int i = 0; i < N; ++i )
129                        begin = new ConstantExpr( Constant::from_int( 0 ) );
130                        end = array->dimension->clone();
131                        cmp = new NameExpr( "?<?" );
132                        update = new NameExpr( "++?" );
133                } else {
134                        // generate: for ( int i = N-1; i >= 0; --i )
135                        begin = new UntypedExpr( new NameExpr( "?-?" ) );
136                        ((UntypedExpr*)begin)->args.push_back( array->dimension->clone() );
137                        ((UntypedExpr*)begin)->args.push_back( new ConstantExpr( Constant::from_int( 1 ) ) );
138                        end = new ConstantExpr( Constant::from_int( 0 ) );
139                        cmp = new NameExpr( "?>=?" );
140                        update = new NameExpr( "--?" );
141                }
142
143                ObjectDecl *index = new ObjectDecl( indexName.newName(), Type::StorageClasses(), LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), new SingleInit( begin ) );
144
145                UntypedExpr *cond = new UntypedExpr( cmp );
146                cond->args.push_back( new VariableExpr( index ) );
147                cond->args.push_back( end );
148
149                UntypedExpr *inc = new UntypedExpr( update );
150                inc->args.push_back( new VariableExpr( index ) );
151
152                UntypedExpr *dstIndex = new UntypedExpr( new NameExpr( "?[?]" ) );
153                dstIndex->args.push_back( dstParam );
154                dstIndex->args.push_back( new VariableExpr( index ) );
155                dstParam = dstIndex;
156
157                // srcParam must keep track of the array indices to build the
158                // source parameter and/or array list initializer
159                srcParam.addArrayIndex( new VariableExpr( index ), array->dimension->clone() );
160
161                // for stmt's body, eventually containing call
162                CompoundStmt * body = new CompoundStmt( noLabels );
163                Statement * listInit = genCall( srcParam, dstParam, fname, back_inserter( body->kids ), array->base, addCast, forward );
164
165                // block containing for stmt and index variable
166                std::list<Statement *> initList;
167                CompoundStmt * block = new CompoundStmt( noLabels );
168                block->push_back( new DeclStmt( noLabels, index ) );
169                if ( listInit ) block->get_kids().push_back( listInit );
170                block->push_back( new ForStmt( noLabels, initList, cond, inc, body ) );
171
172                *out++ = block;
173        }
174
175        template< typename OutputIterator >
176        Statement * genCall( InitTweak::InitExpander & srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, Type * type, bool addCast, bool forward ) {
177                if ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) {
178                        genArrayCall( srcParam, dstParam, fname, out, at, addCast, forward );
179                        return 0;
180                } else {
181                        return genScalarCall( srcParam, dstParam, fname, out, type, addCast );
182                }
183        }
184
185        /// inserts into out a generated call expression to function fname with arguments dstParam
186        /// and srcParam. Intended to be used with generated ?=?, ?{}, and ^?{} calls. decl is the
187        /// object being constructed. The function wraps constructor and destructor calls in an
188        /// ImplicitCtorDtorStmt node.
189        template< typename OutputIterator >
190        void genImplicitCall( InitTweak::InitExpander & srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, DeclarationWithType * decl, bool forward = true ) {
191                ObjectDecl *obj = dynamic_cast<ObjectDecl *>( decl );
192                assert( obj );
193                // unnamed bit fields are not copied as they cannot be accessed
194                if ( isUnnamedBitfield( obj ) ) return;
195
196                bool addCast = (fname == "?{}" || fname == "^?{}") && ( !obj || ( obj && ! obj->get_bitfieldWidth() ) );
197                std::list< Statement * > stmts;
198                genCall( srcParam, dstParam, fname, back_inserter( stmts ), obj->type, addCast, forward );
199
200                // currently genCall should produce at most one element, but if that changes then the next line needs to be updated to grab the statement which contains the call
201                assert( stmts.size() <= 1 );
202                if ( stmts.size() == 1 ) {
203                        Statement * callStmt = stmts.front();
204                        if ( addCast ) {
205                                // implicitly generated ctor/dtor calls should be wrapped
206                                // so that later passes are aware they were generated.
207                                // xxx - don't mark as an implicit ctor/dtor if obj is a bitfield,
208                                // because this causes the address to be taken at codegen, which is illegal in C.
209                                callStmt = new ImplicitCtorDtorStmt( callStmt );
210                        }
211                        *out++ = callStmt;
212                }
213        }
214} // namespace SymTab
215
216// Local Variables: //
217// tab-width: 4 //
218// mode: c++ //
219// compile-command: "make install" //
220// End: //
221
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