Stream DoubleLiteral

runtime/vm/kernel_binary_flowgraph.h

 // Copyright (c) 2017, 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.
 
 #ifndef RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_
 #define RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_
 
 #if !defined(DART_PRECOMPILED_RUNTIME)
 
 #include <map>
 
 #include "vm/kernel.h"
 #include "vm/kernel_binary.h"
 #include "vm/kernel_to_il.h"
 #include "vm/object.h"
 
 namespace dart {
 namespace kernel {
 
+class StreamingConstantEvaluator {
+ public:
+  StreamingConstantEvaluator(StreamingFlowGraphBuilder* builder,
+                             Zone* zone,
+                             TranslationHelper* h,
+                             DartTypeTranslator* type_translator);
+
+  virtual ~StreamingConstantEvaluator() {}
+
+  Instance& EvaluateExpression();
+  void EvaluateDoubleLiteral();
+
+ private:
+  bool GetCachedConstant(intptr_t kernel_offset, Instance* value);
+  void CacheConstantValue(intptr_t kernel_offset, const Instance& value);
+
+  StreamingFlowGraphBuilder* builder_;
+  Isolate* isolate_;
+  Zone* zone_;
+  TranslationHelper& translation_helper_;
+  //  DartTypeTranslator& type_translator_;
+
+  Script& script_;
+  Instance& result_;
+};
+
 class StreamingFlowGraphBuilder {
  public:
-  StreamingFlowGraphBuilder(FlowGraphBuilder* flowGraph_builder,
+  StreamingFlowGraphBuilder(FlowGraphBuilder* flow_graph_builder,
                             const uint8_t* buffer,
                             intptr_t buffer_length)
-      : flow_graph_builder_(flowGraph_builder),
+      : flow_graph_builder_(flow_graph_builder),
+        translation_helper_(flow_graph_builder->translation_helper_),
+        zone_(flow_graph_builder->zone_),
         reader_(new kernel::Reader(buffer, buffer_length)),
+        constant_evaluator_(this,
+                            flow_graph_builder->zone_,

[Kevin Millikin (Google), 2017/03/31 12:23:41]

You should be able to use zone_ and &translation_helper_ here.

+                            &flow_graph_builder->translation_helper_,
+                            &flow_graph_builder->type_translator_),
         string_table_offsets_(NULL),
         string_table_size_(-1),
         string_table_entries_read_(0) {}
 
   virtual ~StreamingFlowGraphBuilder() {
     delete reader_;
     if (string_table_offsets_ != NULL) {
       delete[] string_table_offsets_;
     }
   }
 
   Fragment BuildAt(intptr_t kernel_offset);
 
  private:
   intptr_t GetStringTableOffset(intptr_t index);
 
+  intptr_t ReaderOffset();
+  void SetOffset(intptr_t offset);
+  void SkipBytes(intptr_t skip);
   uint32_t ReadUInt();
   intptr_t ReadListLength();
   TokenPosition ReadPosition(bool record = true);
+  Tag ReadTag(uint8_t* payload = NULL);
 
   CatchBlock* catch_block();
   ScopeBuildingResult* scopes();
+  ParsedFunction* parsed_function();
+
+  dart::String& DartSymbol(intptr_t str_index);
+  dart::String& DartString(intptr_t str_index);
 
   Fragment DebugStepCheck(TokenPosition position);
   Fragment LoadLocal(LocalVariable* variable);
   Fragment PushArgument();
   Fragment RethrowException(TokenPosition position, int catch_try_index);
   Fragment ThrowNoSuchMethodError();
   Fragment Constant(const Object& value);
   Fragment IntConstant(int64_t value);
 
   Fragment BuildInvalidExpression();
   Fragment BuildThisExpression();
   Fragment BuildRethrow();
   Fragment BuildStringLiteral();
   Fragment BuildIntLiteral(uint8_t payload);
   Fragment BuildIntLiteral(bool is_negative);
+  Fragment BuildDoubleLiteral();
   Fragment BuildBoolLiteral(bool value);
   Fragment BuildNullLiteral();
 
   FlowGraphBuilder* flow_graph_builder_;
+  TranslationHelper& translation_helper_;
+  Zone* zone_;
   kernel::Reader* reader_;
+  StreamingConstantEvaluator constant_evaluator_;
   intptr_t* string_table_offsets_;
   intptr_t string_table_size_;
   intptr_t string_table_entries_read_;
+
+  friend class StreamingConstantEvaluator;
 };
 
 }  // namespace kernel
 }  // namespace dart
 
 #endif  // !defined(DART_PRECOMPILED_RUNTIME)
 #endif  // RUNTIME_VM_KERNEL_BINARY_FLOWGRAPH_H_