Changeset eb182b0 for src/InitTweak

Timestamp:

May 23, 2017, 9:55:37 AM (9 years ago)

Author:

Thierry Delisle <tdelisle@…>

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, stuck-waitfor-destruct, with_gc

Children:

27dde72

Parents:

547e9b7 (diff), 935315d (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/InitTweak/FixInit.cc (modified) (2 diffs)

src/InitTweak/FixInit.cc

@@ -619 +619 @@
 
                 Expression * FixCopyCtors::mutate( StmtExpr * stmtExpr ) {
-                        stmtExpr = safe_dynamic_cast< StmtExpr * >( Parent::mutate( stmtExpr ) );
+                        // function call temporaries should be placed at statement-level, rather than nested inside of a new statement expression,
+                        // since temporaries can be shared across sub-expressions, e.g.
+                        //   [A, A] f();
+                        //   g([A] x, [A] y);
+                        //   f(g());
+                        // f is executed once, so the return temporary is shared across the tuple constructors for x and y.
+                        std::list< Statement * > & stmts = stmtExpr->get_statements()->get_kids();
+                        for ( Statement *& stmt : stmts ) {
+                                stmt = stmt->acceptMutator( *this );
+                        } // for
+                        // stmtExpr = safe_dynamic_cast< StmtExpr * >( Parent::mutate( stmtExpr ) );
                         assert( stmtExpr->get_result() );
                         Type * result = stmtExpr->get_result();
@@ -886 +896 @@
                         Parent::visit( compoundStmt );
 
-                        // add destructors for the current scope that we're exiting
+                        // add destructors for the current scope that we're exiting, unless the last statement is a return, which
+                        // causes unreachable code warnings
                         std::list< Statement * > & statements = compoundStmt->get_kids();
-                        insertDtors( reverseDeclOrder.front().begin(), reverseDeclOrder.front().end(), back_inserter( statements ) );
+                        if ( ! statements.empty() && ! dynamic_cast< ReturnStmt * >( statements.back() ) ) {
+                                insertDtors( reverseDeclOrder.front().begin(), reverseDeclOrder.front().end(), back_inserter( statements ) );
+                        }
                         reverseDeclOrder.pop_front();
                 }