source: src/InitTweak/RemoveInit.cc @ 43ffef1

aaron-thesisarm-ehcleanup-dtorsctordeferred_resndemanglerenumforall-pointer-decaygc_noraiijacob/cs343-translationjenkins-sandboxmemorynew-astnew-ast-unique-exprnew-envno_listpersistent-indexerpthread-emulationqualifiedEnumresolv-newstringwith_gc
Last change on this file since 43ffef1 was 43ffef1, checked in by Rob Schluntz <rschlunt@…>, 7 years ago

fixed adapter suffix naming scheme

  • Property mode set to 100644
File size: 5.1 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// RemoveInit.cc --
8//
9// Author           : Rodolfo G. Esteves
10// Created On       : Mon May 18 07:44:20 2015
11// Last Modified By : Rob Schluntz
12// Last Modified On : Mon Nov 16 16:58:36 2015
13// Update Count     : 30
14//
15
16#include "RemoveInit.h"
17#include "SynTree/Declaration.h"
18#include "SynTree/Type.h"
19#include "SynTree/Expression.h"
20#include "SynTree/Statement.h"
21#include "SynTree/Initializer.h"
22#include "SynTree/Mutator.h"
23
24// changes to Validate:
25// -check that ctor/dtor has >= 1 argument
26// -check that first argument to ctor/dtor has pointer type
27// -check that return type is void (0 return types)
28// -transform ctor to return its first argument
29// -generate ctors and dtors alongside ?=? for aggregate types
30
31// idea: modify this pass to decide whether an object declaration is
32// POD type.
33// - If it is not POD-type, initialization should be changed into
34//   a constructor call.
35// - If it is a POD type, then check that there are no designations.
36//   It is probably easiest to leave the declaration in C-initializer
37//   form and resolve as normal, since we don't want to actually incur
38//   the cost of a constructor unless we have to.
39
40// change indexer to remove all constructors for a type once a user-defined one appears?
41
42// question: if a destructor is declared before the scope of a variable ends,
43// should it be destructed? Or should we decide this at declaration point?
44
45
46// alternative (that I think I like better, if there aren't any flaws)
47//   --flaw appears to be the exponential blowup in the number of ctors described below
48// change into constructor form if no designations
49// if not POD type, error out if there are designations
50// if there are designations, handle them in the resolver
51
52// ==MAYBE== even possible to rewrite designations not as ?=?, but as ?{} (see initialization.txt)
53// there may be some transformation that's required to bring this back into a reasonable form
54// for codegen, it'll depend on exactly what the expressions that are fed to the resolver look like
55// e.g.
56
57// struct A {
58//   struct B { int x; } b;
59//   struct C { int x, y, z } c;
60//   struct D { int x; } d;
61// }
62//
63// A a = { 1, 2, 3, 4, 5 };
64// => struct A a;
65//    ?{}(&a.b, (struct B){ 1 } );
66//    ?{}(&a.c, (struct C){ 2, 3, 4 } );
67//    ?{}(&a.d, (struct D){ 5 } );
68// (it obviously shouldn't look like this, but what should it look like??)
69//
70// (perhaps this?)
71// => struct A a;
72//    ?{}(&a, (struct B){ 1 }, (struct C){ 2, 3, 4 }, (struct D){ 5 });
73// (of course, this requires me to do the grouping found here,
74//  and remember that parts might be missing! That said, I'm essentially
75//  already doing this in the resolver, so whatever I guess?)
76// (note this requires an alternative finder, because these may be
77//  function calls, not just simple literals)
78// (this is a bit of a recursive problem - in order to know how to group
79//  the expressions into a struct to be an argument to a constructor, I need to
80//  know what the constructor's signature looks like - but in order to figure out
81//  which constructor is being used (and thus what its signature looks like), I need
82//  to group the values into a struct type)
83// (this seems to imply (to me, anyway) that C initializers can't be represented as
84//  constructors without an exponential blowup in the number of constructors present)
85
86namespace InitTweak {
87        namespace {
88                const std::list<Label> noLabels;
89        }
90
91        void tweak( std::list< Declaration * > translationUnit ) {
92                RemoveInit remover;
93                mutateAll( translationUnit, remover );
94        }
95
96        void RemoveInit::mutateStatementList( std::list< Statement* > &statements ) {
97                for ( std::list< Statement* >::iterator i = statements.begin(); i != statements.end(); ++i ) {
98                        if ( ! stmtsToAddAfter.empty() ) {
99                                statements.splice( i, stmtsToAddAfter );
100                        } // if
101                        *i = (*i)->acceptMutator( *this );
102                } // for
103                if ( ! stmtsToAddAfter.empty() ) {
104                        statements.splice( statements.end(), stmtsToAddAfter );
105                } // if
106        }
107
108        CompoundStmt *RemoveInit::mutate(CompoundStmt *compoundStmt) {
109                mutateStatementList( compoundStmt->get_kids() );
110                return compoundStmt;
111        }
112
113// in the case where an object has an initializer and a polymorphic type, insert an assignment
114// immediately after the declaration. This will (seemingly) cause the later phases to do the right
115// thing with the assignment
116        ObjectDecl *RemoveInit::mutate( ObjectDecl *objDecl ) {
117                if (objDecl->get_init() && dynamic_cast<TypeInstType*>(objDecl->get_type())) {
118                        if (SingleInit * single = dynamic_cast<SingleInit*>(objDecl->get_init())) {
119                                UntypedExpr *assign = new UntypedExpr( new NameExpr( "?=?" ) );
120                                assign->get_args().push_back( new AddressExpr (new NameExpr( objDecl->get_name() ) ) );
121                                assign->get_args().push_back( single->get_value()->clone() );
122                                stmtsToAddAfter.push_back(new ExprStmt(noLabels, assign));
123                        } // if
124                } // if
125                return objDecl;
126        }
127} // namespace InitTweak
128
129// Local Variables: //
130// tab-width: 4 //
131// mode: c++ //
132// compile-command: "make install" //
133// End: //
Note: See TracBrowser for help on using the repository browser.