Changeset 25a1cb0 for src/ResolvExpr/CandidateFinder.cpp

Timestamp:

Sep 1, 2020, 1:18:10 PM (5 years ago)

Author:

Thierry Delisle <tdelisle@…>

Branches:

ADT, arm-eh, ast-experimental, enum, forall-pointer-decay, jacob/cs343-translation, master, new-ast-unique-expr, pthread-emulation, qualifiedEnum

Children:

86c1f1c3, a77496cb

Parents:

8d8ac3b (diff), d3aa64f1 (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.

Message:

Merge branch 'master' of plg.uwaterloo.ca:software/cfa/cfa-cc

File:

• src/ResolvExpr/CandidateFinder.cpp (modified) (1 diff)

src/ResolvExpr/CandidateFinder.cpp

@@ -1089 +1089 @@
                 }
 
+                void postvisit( const ast::KeywordCastExpr * castExpr ) {
+                        const auto & loc = castExpr->location;
+                        assertf( castExpr->result, "Cast target should have been set in Validate." );
+                        auto ref = castExpr->result.strict_as<ast::ReferenceType>();
+                        auto inst = ref->base.strict_as<ast::StructInstType>();
+                        auto target = inst->base.get();
+
+                        CandidateFinder finder{ symtab, tenv };
+
+                        auto pick_alternatives = [target, this](CandidateList & found, bool expect_ref) {
+                                for(auto & cand : found) {
+                                        const ast::Type * expr = cand->expr->result.get();
+                                        if(expect_ref) {
+                                                auto res = dynamic_cast<const ast::ReferenceType*>(expr);
+                                                if(!res) { continue; }
+                                                expr = res->base.get();
+                                        }
+
+                                        if(auto insttype = dynamic_cast<const ast::TypeInstType*>(expr)) {
+                                                auto td = cand->env.lookup(insttype->name);
+                                                if(!td) { continue; }
+                                                expr = td->bound.get();
+                                        }
+
+                                        if(auto base = dynamic_cast<const ast::StructInstType*>(expr)) {
+                                                if(base->base == target) {
+                                                        candidates.push_back( std::move(cand) );
+                                                        reason.code = NoReason;
+                                                }
+                                        }
+                                }
+                        };
+
+                        try {
+                                // Attempt 1 : turn (thread&)X into ($thread&)X.__thrd
+                                // Clone is purely for memory management
+                                std::unique_ptr<const ast::Expr> tech1 { new ast::UntypedMemberExpr(loc, new ast::NameExpr(loc, castExpr->concrete_target.field), castExpr->arg) };
+
+                                // don't prune here, since it's guaranteed all alternatives will have the same type
+                                finder.find( tech1.get(), ResolvMode::withoutPrune() );
+                                pick_alternatives(finder.candidates, false);
+
+                                return;
+                        } catch(SemanticErrorException & ) {}
+
+                        // Fallback : turn (thread&)X into ($thread&)get_thread(X)
+                        std::unique_ptr<const ast::Expr> fallback { ast::UntypedExpr::createDeref(loc,  new ast::UntypedExpr(loc, new ast::NameExpr(loc, castExpr->concrete_target.getter), { castExpr->arg })) };
+                        // don't prune here, since it's guaranteed all alternatives will have the same type
+                        finder.find( fallback.get(), ResolvMode::withoutPrune() );
+
+                        pick_alternatives(finder.candidates, true);
+
+                        // Whatever happens here, we have no more fallbacks
+                }
+
                 void postvisit( const ast::UntypedMemberExpr * memberExpr ) {
                         CandidateFinder aggFinder{ symtab, tenv };