Changeset 6eb8948 for src/Tuples/TupleAssignment.cc

Timestamp:

Sep 12, 2016, 6:32:46 PM (8 years ago)

Author:

Rob Schluntz <rschlunt@…>

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:

f006f01

Parents:

8f7cea1

git-author:

Rob Schluntz <rschlunt@…> (09/12/16 18:24:34)

git-committer:

Rob Schluntz <rschlunt@…> (09/12/16 18:32:46)

Message:

make TupleAssignment? generate temporaries, add StmtExpr? for GCC statement expressions, expand tuple assignment expressions, collapse SolvedTupleExpr?, MassAssignExpr?, and MultipleAssignExpr? into TupleAssignExpr?

File:

• src/Tuples/TupleAssignment.cc (modified) (7 diffs)

src/Tuples/TupleAssignment.cc

@@ -18 +18 @@
 #include "ResolvExpr/typeops.h"
 #include "SynTree/Expression.h"
-#include "TupleAssignment.h"
+#include "SynTree/Initializer.h"
+#include "Tuples.h"
 #include "Common/SemanticError.h"
 
@@ -40 +41 @@
                 // records for assignment generation
                 struct Options {
-                        std::list< ResolvExpr::AltList > get_best();
                         void print( std::ostream & );
                         int size() const { return options.size(); }
@@ -51 +51 @@
                 };
 
-                class Matcher {
+                struct Matcher {
                   public:
                         Matcher( TupleAssignSpotter &spotter, Expression *_lhs, Expression *_rhs );
                         virtual ~Matcher() {}
                         virtual void match( std::list< Expression * > &out ) = 0;
-                        virtual void solve() = 0;
-                        static UntypedExpr *createAssgn( Expression *left, Expression *right );
-                  protected:
                         std::list< Expression * > lhs, rhs;
                         TupleAssignSpotter &spotter;
-                };
-
-                class MassAssignMatcher : public Matcher {
+                        std::list< ObjectDecl * > tmpDecls;
+                };
+
+                struct MassAssignMatcher : public Matcher {
                   public:
                         MassAssignMatcher( TupleAssignSpotter &spotter, Expression *lhs, Expression *rhs ) : Matcher( spotter, lhs, rhs ) {
@@ -69 +67 @@
                         }
                         virtual void match( std::list< Expression * > &out );
-                        virtual void solve();
-                };
-
-                class MultipleAssignMatcher : public Matcher {
+                };
+
+                struct MultipleAssignMatcher : public Matcher {
                   public:
                         MultipleAssignMatcher( TupleAssignSpotter &spot, Expression *lhs, Expression *rhs );
                         virtual void match( std::list< Expression * > &out );
-                        virtual void solve();
                 };
 
                 ResolvExpr::AlternativeFinder &currentFinder;
-                Expression *rhs, *lhs;
+                // Expression *rhs, *lhs;
                 Matcher *matcher = nullptr;
                 Options options;
@@ -149 +145 @@
 
                 if ( new_assigns.empty() ) return;
-                std::list< Expression * > solved_assigns;
                 ResolvExpr::AltList current;
                 // now resolve new assignments
@@ -161 +156 @@
                         current.push_back( alts.front() );
                 }
-                options.options.push_back( current );
-
-                matcher->solve();
+
+                // extract expressions from the assignment alternatives to produce a list of assignments that
+                // together form a single alternative
+                std::list< Expression *> solved_assigns;
+                for ( ResolvExpr::Alternative & alt : current ) {
+                        solved_assigns.push_back( alt.expr->clone() );
+                }
+                // xxx - need to do this??
+                // TypeEnvironment compositeEnv;
+                // simpleCombineEnvironments( i->begin(), i->end(), compositeEnv );
+                currentFinder.get_alternatives().push_front( ResolvExpr::Alternative(new TupleAssignExpr(solved_assigns, matcher->tmpDecls), currentFinder.get_environ(), ResolvExpr::sumCost( current ) ) );
         }
 
@@ -179 +182 @@
         }
 
-        UntypedExpr *TupleAssignSpotter::Matcher::createAssgn( Expression *left, Expression *right ) {
+        UntypedExpr * createAssgn( ObjectDecl *left, ObjectDecl *right ) {
                 assert( left && right );
                 std::list< Expression * > args;
-                args.push_back( new AddressExpr( left->clone() ) );
-                args.push_back( right->clone() );
+                args.push_back( new AddressExpr( new UntypedExpr( new NameExpr("*?"), std::list< Expression * >{ new VariableExpr( left ) } ) ) );
+                args.push_back( new VariableExpr( right ) );
                 return new UntypedExpr( new NameExpr( "?=?" ), args );
         }
 
+        ObjectDecl * newObject( UniqueName & namer, Expression * expr ) {
+                Type * type;
+                assert( expr->get_results().size() >= 1 );
+                if ( expr->get_results().size() > 1 ) {
+                        TupleType * tt = new TupleType( Type::Qualifiers() );
+                        cloneAll( expr->get_results(), tt->get_types() );
+                        type = tt;
+                } else {
+                        type = expr->get_results().front()->clone();
+                }
+                return new ObjectDecl( namer.newName(), DeclarationNode::NoStorageClass, LinkageSpec::Cforall, nullptr, type, new SingleInit( expr->clone() ) );
+        }
+
         void TupleAssignSpotter::MassAssignMatcher::match( std::list< Expression * > &out ) {
+                static UniqueName lhsNamer( "__massassign_L" );
+                static UniqueName rhsNamer( "__massassign_R" );
                 assert ( ! lhs.empty() && rhs.size() == 1);
 
+                ObjectDecl * rtmp = newObject( rhsNamer, rhs.front() );
                 for ( Expression * l : lhs ) {
-                        out.push_back( createAssgn( l, rhs.front() ) );
-                }
-        }
-
-        void TupleAssignSpotter::MassAssignMatcher::solve() {
-                assert( ! spotter.options.empty() );
-                for ( std::list< ResolvExpr::AltList >::iterator i = spotter.options.begin(); i != spotter.options.end(); ++i ) {
-                        // extract expressions from the alternatives to produce a list of assignments that
-                        // together form a single alternative
-                        std::list< Expression *> solved_assigns;
-                        for ( ResolvExpr::Alternative & alt : *i ) {
-                                solved_assigns.push_back( alt.expr );
-                        }
-                        spotter.currentFinder.get_alternatives().push_front( ResolvExpr::Alternative(new SolvedTupleExpr(solved_assigns), spotter.currentFinder.get_environ(), ResolvExpr::sumCost( *i ) ) );
-                }
+                        ObjectDecl * ltmp = newObject( lhsNamer, new AddressExpr( l ) );
+                        out.push_back( createAssgn( ltmp, rtmp ) );
+                        tmpDecls.push_back( ltmp );
+                }
+                tmpDecls.push_back( rtmp );
         }
 
         void TupleAssignSpotter::MultipleAssignMatcher::match( std::list< Expression * > &out ) {
+                static UniqueName lhsNamer( "__multassign_L" );
+                static UniqueName rhsNamer( "__multassign_R" );
                 // xxx - need more complicated matching?
                 if ( lhs.size() == rhs.size() ) {
-                        zipWith( lhs.begin(), lhs.end(), rhs.begin(), rhs.end(), back_inserter(out), TupleAssignSpotter::Matcher::createAssgn );
-                }
-        }
-
-        void TupleAssignSpotter::MultipleAssignMatcher::solve() {
-                // options.print( std::cerr );
-                std::list< ResolvExpr::AltList > best = spotter.options.get_best();
-                if ( best.size() == 1 ) {
-                        std::list<Expression *> solved_assigns;
-                        for ( ResolvExpr::AltList::iterator i = best.front().begin(); i != best.front().end(); ++i ) {
-                                solved_assigns.push_back( i->expr );
-                        }
-                        /* assigning cost zero? */
-                        spotter.currentFinder.get_alternatives().push_front( ResolvExpr::Alternative(new SolvedTupleExpr(solved_assigns), spotter.currentFinder.get_environ(), ResolvExpr::Cost() ) );
-                }
-        }
-
-        std::list< ResolvExpr::AltList > TupleAssignSpotter::Options::get_best() {
-                std::list< ResolvExpr::AltList > ret;
-                std::list< ResolvExpr::AltList > solns;
-                for ( ResolvExpr::AltList & i : options ) {
-                        ResolvExpr::AltList current;
-                        findMinCost( i.begin(), i.end(), back_inserter(current) );
-                        solns.push_back( ResolvExpr::AltList(current.begin(), current.end()) );
-                }
-                // need to combine -- previously "lift_intersection", which
-                // did some madness involving, effectively, the intersection of
-                // a bunch of AltLists
-                std::list<ResolvExpr::AltList> result = solns;
-                if ( result.size() != 1 ) {
-                        throw SemanticError("Ambiguous tuple expression");
-                }
-                ret.push_back( *result.begin() );
-                return ret;
+                        std::list< ObjectDecl * > ltmp;
+                        std::list< ObjectDecl * > rtmp;
+                        std::transform( lhs.begin(), lhs.end(), back_inserter( ltmp ), []( Expression * expr ){
+                                return newObject( lhsNamer, new AddressExpr( expr ) );
+                        });
+                        std::transform( rhs.begin(), rhs.end(), back_inserter( rtmp ), []( Expression * expr ){
+                                return newObject( rhsNamer, expr );
+                        });
+                        zipWith( ltmp.begin(), ltmp.end(), rtmp.begin(), rtmp.end(), back_inserter(out), createAssgn );
+                        tmpDecls.splice( tmpDecls.end(), ltmp );
+                        tmpDecls.splice( tmpDecls.end(), rtmp );
+                }
         }