Changeset 1cdc052 for src/Parser/parser.yy

Timestamp:

Mar 10, 2023, 4:05:50 PM (16 months ago)

Author:

Andrew Beach <ajbeach@…>

Branches:

ADT, ast-experimental, master

Children:

85a95cc

Parents:

fed03b3

Message:

Preventing NullStmts? from being added into ForCtrl? ended up being a larger rework as some timing issues caused problems. However, the NullStmts? are mostly gone now along with the extra hosting they caused.

File:

• src/Parser/parser.yy (modified) (5 diffs)

src/Parser/parser.yy

@@ -206 +206 @@
 #define MISSING_HIGH "Missing high value for down-to range so index is uninitialized."
 
+static ForCtrl * makeForCtrl(
+                DeclarationNode * init,
+                enum OperKinds compop,
+                ExpressionNode * comp,
+                ExpressionNode * inc ) {
+        // Wrap both comp/inc if they are non-null.
+        if ( comp ) comp = new ExpressionNode( build_binary_val(
+                compop,
+                new ExpressionNode( build_varref( new string( *init->name ) ) ),
+                comp ) );
+        if ( inc ) inc = new ExpressionNode( build_binary_val(
+                // choose += or -= for upto/downto
+                compop == OperKinds::LThan || compop == OperKinds::LEThan ? OperKinds::PlusAssn : OperKinds::MinusAssn,
+                new ExpressionNode( build_varref( new string( *init->name ) ) ),
+                inc ) );
+        // The StatementNode call frees init->name, it must happen later.
+        return new ForCtrl( new StatementNode( init ), comp, inc );
+}
+
 ForCtrl * forCtrl( DeclarationNode * index, ExpressionNode * start, enum OperKinds compop, ExpressionNode * comp, ExpressionNode * inc ) {
         if ( index->initializer ) {
@@ -213 +232 @@
                 SemanticError( yylloc, "Multiple loop indexes disallowed in for-loop declaration." );
         } // if
-        return new ForCtrl( index->addInitializer( new InitializerNode( start ) ),
-                // NULL comp/inc => leave blank
-                comp ? new ExpressionNode( build_binary_val( compop, new ExpressionNode( build_varref( new string( *index->name ) ) ), comp ) ) : nullptr,
-                inc ? new ExpressionNode( build_binary_val( compop == OperKinds::LThan || compop == OperKinds::LEThan ? // choose += or -= for upto/downto
-                                                        OperKinds::PlusAssn : OperKinds::MinusAssn, new ExpressionNode( build_varref( new string( *index->name ) ) ), inc ) ) : nullptr );
+        DeclarationNode * initDecl = index->addInitializer( new InitializerNode( start ) );
+        return makeForCtrl( initDecl, compop, comp, inc );
 } // forCtrl
 
@@ -225 +241 @@
                 type = new ExpressionNode( new CastExpr( maybeMoveBuild( type ), new BasicType( Type::Qualifiers(), BasicType::SignedInt ) ) );
         } // if
-//      type = new ExpressionNode( build_func( new ExpressionNode( build_varref( new string( "__for_control_index_constraints__" ) ) ), type ) );
-        return new ForCtrl(
-                distAttr( DeclarationNode::newTypeof( type, true ), DeclarationNode::newName( index )->addInitializer( new InitializerNode( start ) ) ),
-                // NULL comp/inc => leave blank
-                comp ? new ExpressionNode( build_binary_val( compop, new ExpressionNode( build_varref( new string( *index ) ) ), comp ) ) : nullptr,
-                inc ? new ExpressionNode( build_binary_val( compop == OperKinds::LThan || compop == OperKinds::LEThan ? // choose += or -= for upto/downto
-                                                        OperKinds::PlusAssn : OperKinds::MinusAssn, new ExpressionNode( build_varref( new string( *index ) ) ), inc ) ) : nullptr );
+        DeclarationNode * initDecl = distAttr(
+                DeclarationNode::newTypeof( type, true ),
+                DeclarationNode::newName( index )->addInitializer( new InitializerNode( start ) )
+        );
+        return makeForCtrl( initDecl, compop, comp, inc );
 } // forCtrl
 
@@ -1298 +1312 @@
                 { $$ = new StatementNode( build_do_while( $5, maybe_build_compound( $2 ), $8 ) ); }
         | FOR '(' ')' statement                                                         %prec THEN // CFA => for ( ;; )
-                { $$ = new StatementNode( build_for( new ForCtrl( (ExpressionNode * )nullptr, (ExpressionNode * )nullptr, (ExpressionNode * )nullptr ), maybe_build_compound( $4 ) ) ); }
+                { $$ = new StatementNode( build_for( new ForCtrl( nullptr, nullptr, nullptr ), maybe_build_compound( $4 ) ) ); }
         | FOR '(' ')' statement ELSE statement                          // CFA
                 {
-                        $$ = new StatementNode( build_for( new ForCtrl( (ExpressionNode * )nullptr, (ExpressionNode * )nullptr, (ExpressionNode * )nullptr ), maybe_build_compound( $4 ) ) );
+                        $$ = new StatementNode( build_for( new ForCtrl( nullptr, nullptr, nullptr ), maybe_build_compound( $4 ) ) );
                         SemanticWarning( yylloc, Warning::SuperfluousElse );
                 }
@@ -1335 +1349 @@
 for_control_expression:
         ';' comma_expression_opt ';' comma_expression_opt
-                { $$ = new ForCtrl( (ExpressionNode * )nullptr, $2, $4 ); }
+                { $$ = new ForCtrl( nullptr, $2, $4 ); }
         | comma_expression ';' comma_expression_opt ';' comma_expression_opt
-                { $$ = new ForCtrl( $1, $3, $5 ); }
+                {
+                        StatementNode * init = $1 ? new StatementNode( new ExprStmt( maybeMoveBuild( $1 ) ) ) : nullptr;
+                        $$ = new ForCtrl( init, $3, $5 );
+                }
         | declaration comma_expression_opt ';' comma_expression_opt // C99, declaration has ';'
-                { $$ = new ForCtrl( $1, $2, $4 ); }
+                { $$ = new ForCtrl( new StatementNode( $1 ), $2, $4 ); }
 
         | '@' ';' comma_expression                                                      // CFA, empty loop-index
-                { $$ = new ForCtrl( (ExpressionNode *)nullptr, $3, nullptr ); }
+                { $$ = new ForCtrl( nullptr, $3, nullptr ); }
         | '@' ';' comma_expression ';' comma_expression         // CFA, empty loop-index
-                { $$ = new ForCtrl( (ExpressionNode *)nullptr, $3, $5 ); }
+                { $$ = new ForCtrl( nullptr, $3, $5 ); }
 
         | comma_expression                                                                      // CFA, anonymous loop-index