Changeset 4b6ef70 for src/Tuples/TupleAssignment.cc

Timestamp:

Oct 20, 2017, 11:45:53 AM (6 years ago)

Author:

Aaron Moss <a3moss@…>

Branches:

ADT, aaron-thesis, arm-eh, ast-experimental, cleanup-dtors, deferred_resn, demangler, enum, forall-pointer-decay, jacob/cs343-translation, jenkins-sandbox, master, new-ast, new-ast-unique-expr, new-env, no_list, persistent-indexer, pthread-emulation, qualifiedEnum, resolv-new, with_gc

Children:

1fdfc23

Parents:

b5a8ef7

Message:

Fix one tuple bug in resolver refactor

File:

• src/Tuples/TupleAssignment.cc (modified) (12 diffs)

src/Tuples/TupleAssignment.cc

@@ -20 +20 @@
 #include <memory>                          // for unique_ptr, allocator_trai...
 #include <string>                          // for string
-#include <vector>
 
 #include "CodeGen/OperatorTable.h"
@@ -43 +42 @@
 #include "SynTree/Visitor.h"               // for Visitor
 
+#if 0
+#define PRINT(x) x
+#else
+#define PRINT(x)
+#endif
+
 namespace Tuples {
         class TupleAssignSpotter {
@@ -55 +60 @@
                 struct Matcher {
                   public:
-                        Matcher( TupleAssignSpotter &spotter, const ResolvExpr::AltList& lhs, const 
-                                ResolvExpr::AltList& rhs );
+                        Matcher( TupleAssignSpotter &spotter, const ResolvExpr::AltList & alts );
                         virtual ~Matcher() {}
                         virtual void match( std::list< Expression * > &out ) = 0;
@@ -69 +73 @@
                 struct MassAssignMatcher : public Matcher {
                   public:
-                        MassAssignMatcher( TupleAssignSpotter &spotter, const ResolvExpr::AltList& lhs, 
-                                const ResolvExpr::AltList& rhs ) : Matcher(spotter, lhs, rhs) {}
+                        MassAssignMatcher( TupleAssignSpotter &spotter, const ResolvExpr::AltList & alts );
                         virtual void match( std::list< Expression * > &out );
                 };
@@ -76 +79 @@
                 struct MultipleAssignMatcher : public Matcher {
                   public:
-                        MultipleAssignMatcher( TupleAssignSpotter &spotter, const ResolvExpr::AltList& lhs, 
-                                const ResolvExpr::AltList& rhs ) : Matcher(spotter, lhs, rhs) {}
+                        MultipleAssignMatcher( TupleAssignSpotter &spot, const ResolvExpr::AltList & alts );
                         virtual void match( std::list< Expression * > &out );
                 };
@@ -89 +91 @@
         bool isTuple( Expression *expr ) {
                 if ( ! expr ) return false;
-                assert( expr->has_result() );
+                assert( expr->result );
                 return dynamic_cast< TupleType * >( expr->get_result()->stripReferences() );
         }
@@ -114 +116 @@
 
         void handleTupleAssignment( ResolvExpr::AlternativeFinder & currentFinder, UntypedExpr * expr, 
-                                std::vector<ResolvExpr::AlternativeFinder> &args ) {
-                TupleAssignSpotter spotter( currentFinder );
-                spotter.spot( expr, args );
+                std::vector<ResolvExpr::AlternativeFinder> &args ) {
+        TupleAssignSpotter spotter( currentFinder );
+        spotter.spot( expr, args );
         }
 
@@ -122 +124 @@
                 : currentFinder(f) {}
 
-        void TupleAssignSpotter::spot( UntypedExpr * expr, 
-                        std::vector<ResolvExpr::AlternativeFinder> &args ) {
+        void TupleAssignSpotter::spot( UntypedExpr * expr, std::vector<ResolvExpr::AlternativeFinder> &args ) {
+                std::list<ResolvExpr::AltList> possibilities;
+                combos( args.begin(), args.end(), back_inserter( possibilities ) );
+
                 if (  NameExpr *op = dynamic_cast< NameExpr * >(expr->get_function()) ) {
                         if ( CodeGen::isCtorDtorAssign( op->get_name() ) ) {
-                                fname = op->get_name();
-
-                                // AlternativeFinder will naturally handle this case case, if it's legal
-                                if ( args.size() == 0 ) return;
-
-                                // if an assignment only takes 1 argument, that's odd, but maybe someone wrote 
-                                // the function, in which case AlternativeFinder will handle it normally
-                                if ( args.size() == 1 && CodeGen::isAssignment( fname ) ) return;
-
-                                // look over all possible left-hand-sides
-                                for ( ResolvExpr::Alternative& lhsAlt : args[0] ) {
-                                        // skip non-tuple LHS
-                                        if ( ! refToTuple(lhsAlt.expr) ) continue;
-
-                                        // explode is aware of casts - ensure every LHS expression is sent into explode 
-                                        // with a reference cast
-                                        // xxx - this seems to change the alternatives before the normal 
-                                        //  AlternativeFinder flow; maybe this is desired?
-                                        if ( ! dynamic_cast<CastExpr*>( lhsAlt.expr ) ) {
-                                                lhsAlt.expr = new CastExpr( lhsAlt.expr, 
-                                                                new ReferenceType( Type::Qualifiers(), 
-                                                                        lhsAlt.expr->get_result()->clone() ) );
+                               fname = op->get_name();
+                                PRINT( std::cerr << "TupleAssignment: " << fname << std::endl; )
+                                for ( std::list<ResolvExpr::AltList>::const_iterator ali = possibilities.begin(); ali != possibilities.end(); ++ali ) {
+                                        if ( ali->size() == 0 ) continue; // AlternativeFinder will natrually handle this case, if it's legal
+                                        if ( ali->size() <= 1 && CodeGen::isAssignment( op->get_name() ) ) {
+                                                // what does it mean if an assignment takes 1 argument? maybe someone defined such a function, in which case AlternativeFinder will naturally handle it
+                                                continue;
                                         }
 
-                                        // explode the LHS so that each field of a tuple-valued-expr is assigned
-                                        ResolvExpr::AltList lhs;
-                                        explode( lhsAlt, currentFinder.get_indexer(), back_inserter(lhs), true );
-                                        for ( ResolvExpr::Alternative& alt : lhs ) {
-                                                // each LHS value must be a reference - some come in with a cast expression, 
-                                                // if not just cast to reference here
-                                                if ( ! dynamic_cast<ReferenceType*>( alt.expr->get_result() ) ) {
-                                                        alt.expr = new CastExpr( alt.expr, 
-                                                                new ReferenceType( Type::Qualifiers(), 
-                                                                        alt.expr->get_result()->clone() ) );
+                                        assert( ! ali->empty() );
+                                        // grab args 2-N and group into a TupleExpr
+                                        const ResolvExpr::Alternative & alt1 = ali->front();
+                                        auto begin = std::next(ali->begin(), 1), end = ali->end();
+                                        PRINT( std::cerr << "alt1 is " << alt1.expr << std::endl; )
+                                        if ( refToTuple(alt1.expr) ) {
+                                                PRINT( std::cerr << "and is reference to tuple" << std::endl; )
+                                                if ( isMultAssign( begin, end ) ) {
+                                                        PRINT( std::cerr << "possible multiple assignment" << std::endl; )
+                                                        matcher.reset( new MultipleAssignMatcher( *this, *ali ) );
+                                                } else {
+                                                        // mass assignment
+                                                        PRINT( std::cerr << "possible mass assignment" << std::endl; )
+                                                        matcher.reset( new MassAssignMatcher( *this,  *ali ) );
                                                 }
-                                        }
-
-                                        if ( args.size() > 2 ) {
-                                                // expand all possible RHS possibilities
-                                                // TODO build iterative version of this instead of using combos
-                                                std::vector< ResolvExpr::AltList > rhsAlts;
-                                                combos( std::next(args.begin(), 1), args.end(), 
-                                                        std::back_inserter( rhsAlts ) );
-                                                for ( const ResolvExpr::AltList& rhsAlt : rhsAlts ) {
-                                                        // multiple assignment
-                                                        ResolvExpr::AltList rhs;
-                                                        explode( rhsAlt, currentFinder.get_indexer(), 
-                                                                std::back_inserter(rhs), true );
-                                                        matcher.reset( new MultipleAssignMatcher( *this, lhs, rhs ) );
-                                                        match();
-                                                }
-                                        } else {
-                                                for ( const ResolvExpr::Alternative& rhsAlt : args[1] ) {
-                                                        ResolvExpr::AltList rhs;
-                                                        if ( isTuple(rhsAlt.expr) ) {
-                                                                // multiple assignment
-                                                                explode( rhsAlt, currentFinder.get_indexer(),  
-                                                                        std::back_inserter(rhs), true );
-                                                                matcher.reset( new MultipleAssignMatcher( *this, lhs, rhs ) );
-                                                        } else {
-                                                                // mass assignment
-                                                                rhs.push_back( rhsAlt );
-                                                                matcher.reset( new MassAssignMatcher( *this, lhs, rhs ) );
-                                                        }
-                                                        match();
-                                                }
+                                                match();
                                         }
                                 }
@@ -212 +175 @@
                 // now resolve new assignments
                 for ( std::list< Expression * >::iterator i = new_assigns.begin(); i != new_assigns.end(); ++i ) {
+                        PRINT(
+                                std::cerr << "== resolving tuple assign ==" << std::endl;
+                                std::cerr << *i << std::endl;
+                        )
+
                         ResolvExpr::AlternativeFinder finder( currentFinder.get_indexer(), currentFinder.get_environ() );
                         try {
@@ -236 +204 @@
         }
 
-        TupleAssignSpotter::Matcher::Matcher( TupleAssignSpotter &spotter, 
-                const ResolvExpr::AltList &lhs, const ResolvExpr::AltList &rhs ) 
-        : lhs(lhs), rhs(rhs), spotter(spotter), 
-          baseCost( ResolvExpr::sumCost( lhs ) + ResolvExpr::sumCost( rhs ) ) {}
+        TupleAssignSpotter::Matcher::Matcher( TupleAssignSpotter &spotter, const ResolvExpr::AltList &alts ) : spotter(spotter), baseCost( ResolvExpr::sumCost( alts ) ) {
+                assert( ! alts.empty() );
+                // combine argument environments into combined expression environment
+                simpleCombineEnvironments( alts.begin(), alts.end(), compositeEnv );
+
+                ResolvExpr::Alternative lhsAlt = alts.front();
+                // explode is aware of casts - ensure every LHS expression is sent into explode with a reference cast
+                if ( ! dynamic_cast< CastExpr * >( lhsAlt.expr ) ) {
+                        lhsAlt.expr = new CastExpr( lhsAlt.expr, new ReferenceType( Type::Qualifiers(), lhsAlt.expr->get_result()->clone() ) );
+                }
+
+                // explode the lhs so that each field of the tuple-valued-expr is assigned.
+                explode( lhsAlt, spotter.currentFinder.get_indexer(), back_inserter(lhs), true );
+
+                for ( ResolvExpr::Alternative & alt : lhs ) {
+                        // every LHS value must be a reference - some come in with a cast expression, if it doesn't just cast to reference here.
+                        if ( ! dynamic_cast< ReferenceType * >( alt.expr->get_result() ) ) {
+                                alt.expr = new CastExpr( alt.expr, new ReferenceType( Type::Qualifiers(), alt.expr->get_result()->clone() ) );
+                        }
+                }
+        }
+
+        TupleAssignSpotter::MassAssignMatcher::MassAssignMatcher( TupleAssignSpotter &spotter, const ResolvExpr::AltList & alts ) : Matcher( spotter, alts ) {
+                assert( alts.size() == 1 || alts.size() == 2 );
+                if ( alts.size() == 2 ) {
+                        rhs.push_back( alts.back() );
+                }
+        }
+
+        TupleAssignSpotter::MultipleAssignMatcher::MultipleAssignMatcher( TupleAssignSpotter &spotter, const ResolvExpr::AltList & alts ) : Matcher( spotter, alts ) {
+                // explode the rhs so that each field of the tuple-valued-expr is assigned.
+                explode( std::next(alts.begin(), 1), alts.end(), spotter.currentFinder.get_indexer(), back_inserter(rhs), true );
+        }
 
         UntypedExpr * createFunc( const std::string &fname, ObjectDecl *left, ObjectDecl *right ) {
@@ -262 +259 @@
 
         ObjectDecl * TupleAssignSpotter::Matcher::newObject( UniqueName & namer, Expression * expr ) {
-                assert( expr->has_result() && ! expr->get_result()->isVoid() );
+                assert( expr->result && ! expr->get_result()->isVoid() );
                 ObjectDecl * ret = new ObjectDecl( namer.newName(), Type::StorageClasses(), LinkageSpec::Cforall, nullptr, expr->get_result()->clone(), new SingleInit( expr->clone() ) );
                 // if expression type is a reference, don't need to construct anything, a simple initializer is sufficient.
@@ -272 +269 @@
                         ctorInit->accept( rm );
                 }
+                PRINT( std::cerr << "new object: " << ret << std::endl; )
                 return ret;
         }