source: src/SymTab/Autogen.h @ 615a096

aaron-thesisarm-ehcleanup-dtorsdeferred_resndemanglerjacob/cs343-translationjenkins-sandboxnew-astnew-ast-unique-exprnew-envno_listpersistent-indexerresolv-newwith_gc
Last change on this file since 615a096 was 615a096, checked in by Peter A. Buhr <pabuhr@…>, 5 years ago

fix BFCommon problem on gcc-4.9, and begin consistent renaming

  • Property mode set to 100644
File size: 8.2 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 : Fri Mar 17 09:10:41 2017
13// Update Count     : 9
14//
15
16#ifndef AUTOGEN_H
17#define AUTOGEN_H
18
19#include <string>
20#include "SynTree/Statement.h"
21#include "SynTree/Expression.h"
22#include "SynTree/Declaration.h"
23#include "SynTree/Initializer.h"
24#include "InitTweak/InitTweak.h"
25
26namespace SymTab {
27        /// Generates assignment operators, constructors, and destructor for aggregate types as required
28        void autogenerateRoutines( std::list< Declaration * > &translationUnit );
29
30        /// returns true if obj's name is the empty string and it has a bitfield width
31        bool isUnnamedBitfield( ObjectDecl * obj );
32
33        /// size_t type - set when size_t typedef is seen. Useful in a few places,
34        /// such as in determining array dimension type
35        extern Type * SizeType;
36
37        /// inserts into out a generated call expression to function fname with arguments dstParam and srcParam. Intended to be used with generated ?=?, ?{}, and ^?{} calls.
38        template< typename OutputIterator >
39        Statement * genCall( InitTweak::InitExpander & srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, Type * type, bool addCast = false, bool forward = true );
40
41        /// inserts into out a generated call expression to function fname with arguments dstParam and srcParam. Should only be called with non-array types.
42        /// optionally returns a statement which must be inserted prior to the containing loop, if there is one
43        template< typename OutputIterator >
44        Statement * genScalarCall( InitTweak::InitExpander & srcParam, Expression *dstParam, const std::string & fname, OutputIterator out, Type * type, bool addCast = false ) {
45                // want to be able to generate assignment, ctor, and dtor generically,
46                // so fname is either ?=?, ?{}, or ^?{}
47                UntypedExpr *fExpr = new UntypedExpr( new NameExpr( fname ) );
48
49                // do something special for unnamed members
50                dstParam = new AddressExpr( dstParam );
51                if ( addCast ) {
52                        // cast to T* with qualifiers removed, so that qualified objects can be constructed
53                        // and destructed with the same functions as non-qualified objects.
54                        // unfortunately, lvalue is considered a qualifier. For AddressExpr to resolve, its argument
55                        // must have an lvalue qualified type, so remove all qualifiers except lvalue. If we ever
56                        // remove lvalue as a qualifier, this can change to
57                        //   type->get_qualifiers() = Type::Qualifiers();
58                        assert( type );
59                        Type * castType = type->clone();
60//                      castType->get_qualifiers() -= Type::Qualifiers(true, true, true, false, true, false);
61                        castType->get_qualifiers() -= Type::Qualifiers( Type::Const | Type::Volatile | Type::Restrict | Type::Atomic );
62                        castType->set_lvalue( true ); // xxx - might not need this
63                        dstParam = new CastExpr( dstParam, new PointerType( Type::Qualifiers(), castType ) );
64                }
65                fExpr->get_args().push_back( dstParam );
66
67                Statement * listInit = srcParam.buildListInit( fExpr );
68
69                std::list< Expression * > args = *++srcParam;
70                fExpr->get_args().splice( fExpr->get_args().end(), args );
71
72                *out++ = new ExprStmt( noLabels, fExpr );
73
74                srcParam.clearArrayIndices();
75
76                return listInit;
77        }
78
79        /// Store in out a loop which calls fname on each element of the array with srcParam and dstParam as arguments.
80        /// If forward is true, loop goes from 0 to N-1, else N-1 to 0
81        template< typename OutputIterator >
82        void genArrayCall( InitTweak::InitExpander & srcParam, Expression *dstParam, const std::string & fname, OutputIterator out, ArrayType *array, bool addCast = false, bool forward = true ) {
83                static UniqueName indexName( "_index" );
84
85                // for a flexible array member nothing is done -- user must define own assignment
86                if ( ! array->get_dimension() ) return ;
87
88                Expression * begin, * end, * update, * cmp;
89                if ( forward ) {
90                        // generate: for ( int i = 0; i < 0; ++i )
91                        begin = new ConstantExpr( Constant( new ZeroType( emptyQualifiers ), "0" ) );
92                        end = array->get_dimension()->clone();
93                        cmp = new NameExpr( "?<?" );
94                        update = new NameExpr( "++?" );
95                } else {
96                        // generate: for ( int i = N-1; i >= 0; --i )
97                        begin = new UntypedExpr( new NameExpr( "?-?" ) );
98                        ((UntypedExpr*)begin)->get_args().push_back( array->get_dimension()->clone() );
99                        ((UntypedExpr*)begin)->get_args().push_back( new ConstantExpr( Constant( new OneType( emptyQualifiers ), "1" ) ) );
100                        end = new ConstantExpr( Constant( new ZeroType( emptyQualifiers ), "0" ) );
101                        cmp = new NameExpr( "?>=?" );
102                        update = new NameExpr( "--?" );
103                }
104
105                ObjectDecl *index = new ObjectDecl( indexName.newName(), Type::StorageClasses(), LinkageSpec::C, 0, new BasicType( Type::Qualifiers(), BasicType::SignedInt ), new SingleInit( begin, std::list<Expression*>() ) );
106
107                UntypedExpr *cond = new UntypedExpr( cmp );
108                cond->get_args().push_back( new VariableExpr( index ) );
109                cond->get_args().push_back( end );
110
111                UntypedExpr *inc = new UntypedExpr( update );
112                inc->get_args().push_back( new AddressExpr( new VariableExpr( index ) ) );
113
114                UntypedExpr *dstIndex = new UntypedExpr( new NameExpr( "?[?]" ) );
115                dstIndex->get_args().push_back( dstParam );
116                dstIndex->get_args().push_back( new VariableExpr( index ) );
117                dstParam = dstIndex;
118
119                // srcParam must keep track of the array indices to build the
120                // source parameter and/or array list initializer
121                srcParam.addArrayIndex( new VariableExpr( index ), array->get_dimension()->clone() );
122
123                // for stmt's body, eventually containing call
124                CompoundStmt * body = new CompoundStmt( noLabels );
125                Statement * listInit = genCall( srcParam, dstParam, fname, back_inserter( body->get_kids() ), array->get_base(), addCast, forward );
126
127                // block containing for stmt and index variable
128                std::list<Statement *> initList;
129                CompoundStmt * block = new CompoundStmt( noLabels );
130                block->get_kids().push_back( new DeclStmt( noLabels, index ) );
131                if ( listInit ) block->get_kids().push_back( listInit );
132                block->get_kids().push_back( new ForStmt( noLabels, initList, cond, inc, body ) );
133
134                *out++ = block;
135        }
136
137        template< typename OutputIterator >
138        Statement * genCall( InitTweak::InitExpander &  srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, Type * type, bool addCast, bool forward ) {
139                if ( ArrayType * at = dynamic_cast< ArrayType * >( type ) ) {
140                        genArrayCall( srcParam, dstParam, fname, out, at, addCast, forward );
141                        return 0;
142                } else {
143                        return genScalarCall( srcParam, dstParam, fname, out, type, addCast );
144                }
145        }
146
147        /// inserts into out a generated call expression to function fname with arguments dstParam
148        /// and srcParam. Intended to be used with generated ?=?, ?{}, and ^?{} calls. decl is the
149        /// object being constructed. The function wraps constructor and destructor calls in an
150        /// ImplicitCtorDtorStmt node.
151        template< typename OutputIterator >
152        void genImplicitCall( InitTweak::InitExpander &  srcParam, Expression * dstParam, const std::string & fname, OutputIterator out, DeclarationWithType * decl, bool forward = true ) {
153                ObjectDecl *obj = dynamic_cast<ObjectDecl *>( decl );
154                assert( obj );
155                // unnamed bit fields are not copied as they cannot be accessed
156                if ( isUnnamedBitfield( obj ) ) return;
157
158                bool addCast = (fname == "?{}" || fname == "^?{}") && ( !obj || ( obj && obj->get_bitfieldWidth() == NULL ) );
159                std::list< Statement * > stmts;
160                genCall( srcParam, dstParam, fname, back_inserter( stmts ), obj->get_type(), addCast, forward );
161
162                // 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
163                assert( stmts.size() <= 1 );
164                if ( stmts.size() == 1 ) {
165                        Statement * callStmt = stmts.front();
166                        if ( addCast ) {
167                                // implicitly generated ctor/dtor calls should be wrapped
168                                // so that later passes are aware they were generated.
169                                // xxx - don't mark as an implicit ctor/dtor if obj is a bitfield,
170                                // because this causes the address to be taken at codegen, which is illegal in C.
171                                callStmt = new ImplicitCtorDtorStmt( callStmt );
172                        }
173                        *out++ = callStmt;
174                }
175        }
176} // namespace SymTab
177#endif // AUTOGEN_H
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