Source positions for constructors and lots of async machinery

runtime/vm/ast_transformer.cc

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/ast_transformer.h"
 
 #include "vm/object_store.h"
 #include "vm/parser.h"
 #include "vm/thread.h"
 
@@ skipping 71 matching lines @@
 
 
 LocalVariable* AwaitTransformer::GetVariableInScope(LocalScope* scope,
                                                     const String& symbol) {
   LocalVariable* var = scope->LookupVariable(symbol, false);
   ASSERT(var != NULL);
   return var;
 }
 
 
-LocalVariable* AwaitTransformer::AddToPreambleNewTempVar(AstNode* node) {
+LocalVariable* AwaitTransformer::AddToPreambleNewTempVar(AstNode* node,
+                                                         intptr_t token_pos) {
   LocalVariable* tmp_var = EnsureCurrentTempVar();
-  preamble_->Add(new(Z) StoreLocalNode(Scanner::kNoSourcePos, tmp_var, node));
+  preamble_->Add(new(Z) StoreLocalNode(token_pos, tmp_var, node));
   NextTempVar();
   return tmp_var;
 }
 
 
 void AwaitTransformer::VisitLiteralNode(LiteralNode* node) {
   result_ = node;
 }
 
 
@@ skipping 22 matching lines @@
   LocalVariable* async_catch_error_callback = GetVariableInScope(
       preamble_->scope(), Symbols::AsyncCatchErrorCallback());
   LocalVariable* result_param = GetVariableInScope(
       preamble_->scope(), Symbols::AsyncOperationParam());
   LocalVariable* error_param = GetVariableInScope(
       preamble_->scope(), Symbols::AsyncOperationErrorParam());
   LocalVariable* stack_trace_param = GetVariableInScope(
       preamble_->scope(), Symbols::AsyncOperationStackTraceParam());
 
   AstNode* transformed_expr = Transform(node->expr());
-  LocalVariable* await_temp = AddToPreambleNewTempVar(transformed_expr);
+  LocalVariable* await_temp = AddToPreambleNewTempVar(transformed_expr,
+                                                      token_pos);
 
   AwaitMarkerNode* await_marker =
       new (Z) AwaitMarkerNode(async_temp_scope_, node->scope(), token_pos);
   preamble_->Add(await_marker);
 
   // :result_param = _awaitHelper(
   //      :await_temp, :async_then_callback, :async_catch_error_callback)
   const Library& async_lib = Library::Handle(Library::AsyncLibrary());
   const Function& async_await_helper = Function::ZoneHandle(
       Z, async_lib.LookupFunctionAllowPrivate(Symbols::AsyncAwaitHelper()));
   ASSERT(!async_await_helper.IsNull());
-  ArgumentListNode* async_await_helper_args = new (Z) ArgumentListNode(
-      Scanner::kNoSourcePos);
+  ArgumentListNode* async_await_helper_args =
+      new (Z) ArgumentListNode(token_pos);
   async_await_helper_args->Add(
-      new(Z) LoadLocalNode(Scanner::kNoSourcePos, await_temp));
+      new(Z) LoadLocalNode(token_pos, await_temp));
   async_await_helper_args->Add(
-      new(Z) LoadLocalNode(Scanner::kNoSourcePos, async_then_callback));
+      new(Z) LoadLocalNode(token_pos, async_then_callback));
   async_await_helper_args->Add(
-      new(Z) LoadLocalNode(Scanner::kNoSourcePos, async_catch_error_callback));
+      new(Z) LoadLocalNode(token_pos, async_catch_error_callback));
   StaticCallNode* await_helper_call = new (Z) StaticCallNode(
-      node->token_pos(),
+      token_pos,
       async_await_helper,
       async_await_helper_args);
 
   preamble_->Add(new(Z) StoreLocalNode(
-      Scanner::kNoSourcePos, result_param, await_helper_call));
+      token_pos, result_param, await_helper_call));
 
-  ReturnNode* continuation_return = new(Z) ReturnNode(Scanner::kNoSourcePos);
+  ReturnNode* continuation_return = new(Z) ReturnNode(token_pos);
   continuation_return->set_return_type(ReturnNode::kContinuationTarget);
   preamble_->Add(continuation_return);
 
   // If this expression is part of a try block, also append the code for
   // restoring the saved try context that lives on the stack and possibly the
   // saved try context of the outer try block.
   if (node->saved_try_ctx() != NULL) {
     preamble_->Add(new (Z) StoreLocalNode(
-        Scanner::kNoSourcePos,
+        token_pos,
         node->saved_try_ctx(),
-        new (Z) LoadLocalNode(Scanner::kNoSourcePos,
+        new (Z) LoadLocalNode(token_pos,
                               node->async_saved_try_ctx())));
     if (node->outer_saved_try_ctx() != NULL) {
       preamble_->Add(new (Z) StoreLocalNode(
-          Scanner::kNoSourcePos,
+          token_pos,
           node->outer_saved_try_ctx(),
-          new (Z) LoadLocalNode(Scanner::kNoSourcePos,
+          new (Z) LoadLocalNode(token_pos,
                                 node->outer_async_saved_try_ctx())));
     }
   } else {
     ASSERT(node->outer_saved_try_ctx() == NULL);
   }
 
   // Load the async_op variable. It is unused, but the observatory uses it
   // to determine if a breakpoint is inside an asynchronous function.
-  LoadLocalNode* load_async_op = new (Z) LoadLocalNode(
-      Scanner::kNoSourcePos, async_op);
+  LoadLocalNode* load_async_op = new (Z) LoadLocalNode(token_pos, async_op);
   preamble_->Add(load_async_op);
 
   LoadLocalNode* load_error_param = new (Z) LoadLocalNode(
-      Scanner::kNoSourcePos, error_param);
+      token_pos, error_param);
   LoadLocalNode* load_stack_trace_param = new (Z) LoadLocalNode(
-      Scanner::kNoSourcePos, stack_trace_param);
+      token_pos, stack_trace_param);
   SequenceNode* error_ne_null_branch = new (Z) SequenceNode(
-      Scanner::kNoSourcePos, ChainNewScope(preamble_->scope()));
+      token_pos, ChainNewScope(preamble_->scope()));
   error_ne_null_branch->Add(new (Z) ThrowNode(
-      Scanner::kNoSourcePos,
+      token_pos,
       load_error_param,
       load_stack_trace_param));
   preamble_->Add(new (Z) IfNode(
-      Scanner::kNoSourcePos,
+      token_pos,
       new (Z) ComparisonNode(
-          Scanner::kNoSourcePos,
+          token_pos,
           Token::kNE,
           load_error_param,
-          new (Z) LiteralNode(Scanner::kNoSourcePos,
+          new (Z) LiteralNode(token_pos,
                               Object::null_instance())),
           error_ne_null_branch,
           NULL));
 
   LocalVariable* result = AddToPreambleNewTempVar(new(Z) LoadLocalNode(
-      Scanner::kNoSourcePos, result_param));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+      node->token_pos(), result_param), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 // Transforms boolean expressions into a sequence of evaluatons that only lazily
 // evaluate subexpressions.
 //
 // Example:
 //
 //   (a || b) only evaluates b if a is false
 //
 // Transformation (roughly):
 //
 //   t_1 = a;
 //   if (!t_1) {
 //     t_2 = b;
 //   }
 //   t_3 = t_1 || t_2;  // Compiler takes care that lazy evaluation takes place
 //                         on this level.
 AstNode* AwaitTransformer::LazyTransform(const Token::Kind logical_op,
                                          AstNode* new_left,
                                          AstNode* right) {
   ASSERT(logical_op == Token::kAND || logical_op == Token::kOR);
   AstNode* result = NULL;
   const Token::Kind compare_logical_op = (logical_op == Token::kAND) ?
       Token::kEQ : Token::kNE;
   SequenceNode* eval = new (Z) SequenceNode(
-      Scanner::kNoSourcePos, ChainNewScope(preamble_->scope()));
+      new_left->token_pos(), ChainNewScope(preamble_->scope()));
   SequenceNode* saved_preamble = preamble_;
   preamble_ = eval;
   result = Transform(right);
   preamble_ = saved_preamble;
   IfNode* right_body = new(Z) IfNode(
-      Scanner::kNoSourcePos,
+      new_left->token_pos(),
       new(Z) ComparisonNode(
-          Scanner::kNoSourcePos,
+          new_left->token_pos(),
           compare_logical_op,
           new_left,
-          new(Z) LiteralNode(Scanner::kNoSourcePos, Bool::True())),
+          new(Z) LiteralNode(new_left->token_pos(), Bool::True())),
       eval,
       NULL);
   preamble_->Add(right_body);
   return result;
 }
 
 
 LocalScope* AwaitTransformer::ChainNewScope(LocalScope* parent) {
   return new (Z) LocalScope(
       parent, parent->function_level(), parent->loop_level());
 }
 
 
 void AwaitTransformer::VisitBinaryOpNode(BinaryOpNode* node) {
   AstNode* new_left = Transform(node->left());
   AstNode* new_right = NULL;
   // Preserve lazy evaluaton.
   if ((node->kind() == Token::kAND) || (node->kind() == Token::kOR)) {
     new_right = LazyTransform(node->kind(), new_left, node->right());
   } else {
     new_right = Transform(node->right());
   }
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) BinaryOpNode(node->token_pos(),
                           node->kind(),
                           new_left,
-                          new_right));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                          new_right), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitBinaryOpWithMask32Node(
     BinaryOpWithMask32Node* node) {
   ASSERT((node->kind() != Token::kAND) && (node->kind() != Token::kOR));
   AstNode* new_left = Transform(node->left());
   AstNode* new_right = Transform(node->right());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) BinaryOpWithMask32Node(node->token_pos(),
                                     node->kind(),
                                     new_left,
                                     new_right,
-                                    node->mask32()));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                                    node->mask32()), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitComparisonNode(ComparisonNode* node) {
   AstNode* new_left = Transform(node->left());
   AstNode* new_right = Transform(node->right());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) ComparisonNode(node->token_pos(),
                             node->kind(),
                             new_left,
-                            new_right));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                            new_right), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitUnaryOpNode(UnaryOpNode* node) {
   AstNode* new_operand = Transform(node->operand());
   LocalVariable* result = AddToPreambleNewTempVar(
-      new(Z) UnaryOpNode(node->token_pos(), node->kind(), new_operand));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+      new(Z) UnaryOpNode(node->token_pos(), node->kind(), new_operand),
+      node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 // ::= (<condition>) ? <true-branch> : <false-branch>
 //
 void AwaitTransformer::VisitConditionalExprNode(ConditionalExprNode* node) {
   AstNode* new_condition = Transform(node->condition());
   SequenceNode* new_true = new (Z) SequenceNode(
-      Scanner::kNoSourcePos, ChainNewScope(preamble_->scope()));
+      node->true_expr()->token_pos(), ChainNewScope(preamble_->scope()));
   SequenceNode* saved_preamble = preamble_;
   preamble_ = new_true;
   AstNode* new_true_result = Transform(node->true_expr());
   SequenceNode* new_false = new (Z) SequenceNode(
-      Scanner::kNoSourcePos, ChainNewScope(preamble_->scope()));
+      node->false_expr()->token_pos(), ChainNewScope(preamble_->scope()));
   preamble_ = new_false;
   AstNode* new_false_result = Transform(node->false_expr());
   preamble_ = saved_preamble;
-  IfNode* new_if = new(Z) IfNode(Scanner::kNoSourcePos,
+  IfNode* new_if = new(Z) IfNode(node->token_pos(),
                                  new_condition,
                                  new_true,
                                  new_false);
   preamble_->Add(new_if);
   LocalVariable* result = AddToPreambleNewTempVar(
-      new(Z) ConditionalExprNode(Scanner::kNoSourcePos,
+      new(Z) ConditionalExprNode(node->token_pos(),
                                  new_condition,
                                  new_true_result,
-                                 new_false_result));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                                 new_false_result), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitArgumentListNode(ArgumentListNode* node) {
   ArgumentListNode* new_args = new(Z) ArgumentListNode(node->token_pos());
   for (intptr_t i = 0; i < node->length(); i++) {
     new_args->Add(Transform(node->NodeAt(i)));
   }
   new_args->set_names(node->names());
   result_ = new_args;
 }
 
 
 void AwaitTransformer::VisitArrayNode(ArrayNode* node) {
   GrowableArray<AstNode*> new_elements;
   for (intptr_t i = 0; i < node->length(); i++) {
     new_elements.Add(Transform(node->ElementAt(i)));
   }
   result_ = new(Z) ArrayNode(node->token_pos(), node->type(), new_elements);
 }
 
 
 void AwaitTransformer::VisitStringInterpolateNode(StringInterpolateNode* node) {
   ArrayNode* new_value = Transform(node->value())->AsArrayNode();
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) StringInterpolateNode(node->token_pos(),
-                                   new_value));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                                   new_value), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitClosureNode(ClosureNode* node) {
   AstNode* new_receiver = node->receiver();
   if (new_receiver != NULL) {
     new_receiver = Transform(new_receiver);
   }
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) ClosureNode(node->token_pos(),
                          node->function(),
                          new_receiver,
-                         node->scope()));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                         node->scope()), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitInstanceCallNode(InstanceCallNode* node) {
   AstNode* new_receiver = Transform(node->receiver());
   ArgumentListNode* new_args =
       Transform(node->arguments())->AsArgumentListNode();
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) InstanceCallNode(node->token_pos(),
                               new_receiver,
                               node->function_name(),
                               new_args,
-                              node->is_conditional()));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                              node->is_conditional()), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitStaticCallNode(StaticCallNode* node) {
   ArgumentListNode* new_args =
       Transform(node->arguments())->AsArgumentListNode();
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) StaticCallNode(node->token_pos(),
                             node->function(),
-                            new_args));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                            new_args), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitConstructorCallNode(ConstructorCallNode* node) {
   ArgumentListNode* new_args =
       Transform(node->arguments())->AsArgumentListNode();
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) ConstructorCallNode(node->token_pos(),
                                  node->type_arguments(),
                                  node->constructor(),
-                                 new_args));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                                 new_args), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitInstanceGetterNode(InstanceGetterNode* node) {
   AstNode* new_receiver = Transform(node->receiver());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) InstanceGetterNode(node->token_pos(),
                                 new_receiver,
                                 node->field_name(),
-                                node->is_conditional()));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                                node->is_conditional()), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitInstanceSetterNode(InstanceSetterNode* node) {
   AstNode* new_receiver = node->receiver();
   if (new_receiver != NULL) {
     new_receiver = Transform(new_receiver);
   }
   AstNode* new_value = Transform(node->value());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) InstanceSetterNode(node->token_pos(),
                                 new_receiver,
                                 node->field_name(),
                                 new_value,
-                                node->is_conditional()));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                                node->is_conditional()), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitStaticGetterNode(StaticGetterNode* node) {
   AstNode* new_receiver = node->receiver();
   if (new_receiver != NULL) {
     new_receiver = Transform(new_receiver);
   }
   StaticGetterNode* new_getter =
       new(Z) StaticGetterNode(node->token_pos(),
                               new_receiver,
                               node->cls(),
                               node->field_name());
   new_getter->set_owner(node->owner());
-  LocalVariable* result = AddToPreambleNewTempVar(new_getter);
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+  LocalVariable* result =
+      AddToPreambleNewTempVar(new_getter, node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitStaticSetterNode(StaticSetterNode* node) {
   AstNode* new_receiver = node->receiver();
   if (new_receiver != NULL) {
     new_receiver = Transform(new_receiver);
   }
   AstNode* new_value = Transform(node->value());
   StaticSetterNode* new_setter =
       node->function().IsNull()
       ? new(Z) StaticSetterNode(node->token_pos(),
                                 new_receiver,
                                 node->cls(),
                                 node->field_name(),
                                 new_value)
       : new(Z) StaticSetterNode(node->token_pos(),
                                 new_receiver,
                                 node->field_name(),
                                 node->function(),
                                 new_value);
 
-  LocalVariable* result = AddToPreambleNewTempVar(new_setter);
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+  LocalVariable* result =
+      AddToPreambleNewTempVar(new_setter, node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitLoadLocalNode(LoadLocalNode* node) {
   result_ = node;
 }
 
 
 void AwaitTransformer::VisitStoreLocalNode(StoreLocalNode* node) {
   AstNode* new_value = Transform(node->value());
@@ skipping 14 matching lines @@
 }
 
 
 void AwaitTransformer::VisitLoadIndexedNode(LoadIndexedNode* node) {
   AstNode* new_array = Transform(node->array());
   AstNode* new_index = Transform(node->index_expr());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) LoadIndexedNode(node->token_pos(),
                              new_array,
                              new_index,
-                             node->super_class()));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                             node->super_class()), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitStoreIndexedNode(StoreIndexedNode* node) {
   AstNode* new_array = Transform(node->array());
   AstNode* new_index = Transform(node->index_expr());
   AstNode* new_value = Transform(node->value());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) StoreIndexedNode(node->token_pos(),
                               new_array,
                               new_index,
                               new_value,
-                              node->super_class()));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                              node->super_class()), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitAssignableNode(AssignableNode* node) {
   AstNode* new_expr = Transform(node->expr());
   LocalVariable* result = AddToPreambleNewTempVar(
       new(Z) AssignableNode(node->token_pos(),
                             new_expr,
                             node->type(),
-                            node->dst_name()));
-  result_ = new(Z) LoadLocalNode(Scanner::kNoSourcePos, result);
+                            node->dst_name()), node->token_pos());
+  result_ = new(Z) LoadLocalNode(node->token_pos(), result);
 }
 
 
 void AwaitTransformer::VisitLetNode(LetNode* node) {
   // Add all the initializer nodes to the preamble and the
   // temporary variables to the scope for async temporary variables.
   // The temporary variables will be captured as a side effect of being
   // added to a scope, and the subsequent nodes that are added to the
   // preample can access them.
   for (intptr_t i = 0; i < node->num_temps(); i++) {
     async_temp_scope_->AddVariable(node->TempAt(i));
     AstNode* new_init_val = Transform(node->InitializerAt(i));
     preamble_->Add(new(Z) StoreLocalNode(node->token_pos(),
-                   node->TempAt(i),
-                   new_init_val));
+                                         node->TempAt(i),
+                                         new_init_val));
   }
 
   // Add all expressions but the last to the preamble. We must do
   // this because subexpressions of the awaitable expression we
   // are currently transforming may depend on each other,
   // e.g. await foo(a++, a++). Thus we must preserve the order of the
   // transformed subexpressions.
   for (intptr_t i = 0; i < node->nodes().length() - 1; i++) {
     preamble_->Add(Transform(node->nodes()[i]));
   }
 
   // The last expression in the let node is the value of the node.
   // The result of the transformed let node is this expression.
   ASSERT(node->nodes().length() > 0);
   const intptr_t last_node_index = node->nodes().length() - 1;
   result_ = Transform(node->nodes()[last_node_index]);
 }
 
 
 void AwaitTransformer::VisitThrowNode(ThrowNode* node) {
   AstNode* new_exception = Transform(node->exception());
   result_ = new(Z) ThrowNode(node->token_pos(),
                              new_exception,
                              node->stacktrace());
 }
 
 }  // namespace dart