Initial steps into streaming the kernel flowgraph

runtime/vm/kernel_binary_flowgraph.cc

Index: runtime/vm/kernel_binary_flowgraph.cc
diff --git a/runtime/vm/kernel_binary_flowgraph.cc b/runtime/vm/kernel_binary_flowgraph.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4aa9585b626158fbc581909156ef9f50ad477d0f
--- /dev/null
+++ b/runtime/vm/kernel_binary_flowgraph.cc
@@ -0,0 +1,153 @@
+// Copyright (c) 2016, 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/kernel_binary_flowgraph.h"
+
+#if !defined(DART_PRECOMPILED_RUNTIME)
+
+namespace dart {
+namespace kernel {
+
+Fragment StreamingFlowGraphBuilder::BuildAt(intptr_t kernel_offset) {
+  reader_->set_offset(kernel_offset);
+
+  uint8_t payload = 0;
+  Tag tag = reader_->ReadTag(&payload);
+  switch (tag) {
+    //    case kInvalidExpression:
+    //      return InvalidExpression::ReadFrom(reader_);
+    //    case kVariableGet:
+    //      return VariableGet::ReadFrom(reader_);
+    //    case kSpecializedVariableGet:
+    //      return VariableGet::ReadFrom(reader_, payload);
+    //    case kVariableSet:
+    //      return VariableSet::ReadFrom(reader_);
+    //    case kSpecializedVariableSet:
+    //      return VariableSet::ReadFrom(reader_, payload);
+    //    case kPropertyGet:
+    //      return PropertyGet::ReadFrom(reader_);
+    //    case kPropertySet:
+    //      return PropertySet::ReadFrom(reader_);
+    //    case kDirectPropertyGet:
+    //      return DirectPropertyGet::ReadFrom(reader_);
+    //    case kDirectPropertySet:
+    //      return DirectPropertySet::ReadFrom(reader_);
+    //    case kStaticGet:
+    //      return StaticGet::ReadFrom(reader_);
+    //    case kStaticSet:
+    //      return StaticSet::ReadFrom(reader_);
+    //    case kMethodInvocation:
+    //      return MethodInvocation::ReadFrom(reader_);
+    //    case kDirectMethodInvocation:
+    //      return DirectMethodInvocation::ReadFrom(reader_);
+    //    case kStaticInvocation:
+    //      return StaticInvocation::ReadFrom(reader_, false);
+    //    case kConstStaticInvocation:
+    //      return StaticInvocation::ReadFrom(reader_, true);
+    //    case kConstructorInvocation:
+    //      return ConstructorInvocation::ReadFrom(reader_, false);
+    //    case kConstConstructorInvocation:
+    //      return ConstructorInvocation::ReadFrom(reader_, true);
+    //    case kNot:
+    //      return Not::ReadFrom(reader_);
+    //    case kLogicalExpression:
+    //      return LogicalExpression::ReadFrom(reader_);
+    //    case kConditionalExpression:
+    //      return ConditionalExpression::ReadFrom(reader_);
+    //    case kStringConcatenation:
+    //      return StringConcatenation::ReadFrom(reader_);
+    //    case kIsExpression:
+    //      return IsExpression::ReadFrom(reader_);
+    //    case kAsExpression:
+    //      return AsExpression::ReadFrom(reader_);
+    //    case kSymbolLiteral:
+    //      return SymbolLiteral::ReadFrom(reader_);
+    //    case kTypeLiteral:
+    //      return TypeLiteral::ReadFrom(reader_);
+    //    case kThisExpression:
+    //      return ThisExpression::ReadFrom(reader_);
+    case kRethrow:
+      return BuildRethrow();
+    //    case kThrow:
+    //      return Throw::ReadFrom(reader_);
+    //    case kListLiteral:
+    //      return ListLiteral::ReadFrom(reader_, false);
+    //    case kConstListLiteral:
+    //      return ListLiteral::ReadFrom(reader_, true);
+    //    case kMapLiteral:
+    //      return MapLiteral::ReadFrom(reader_, false);
+    //    case kConstMapLiteral:
+    //      return MapLiteral::ReadFrom(reader_, true);
+    //    case kAwaitExpression:
+    //      return AwaitExpression::ReadFrom(reader_);
+    //    case kFunctionExpression:
+    //      return FunctionExpression::ReadFrom(reader_);
+    //    case kLet:
+    //      return Let::ReadFrom(reader_);
+    //    case kBigIntLiteral:
+    //      return BigintLiteral::ReadFrom(reader_);
+    //    case kStringLiteral:
+    //      return StringLiteral::ReadFrom(reader_);
+    //    case kSpecialIntLiteral:
+    //      return IntLiteral::ReadFrom(reader_, payload);
+    //    case kNegativeIntLiteral:
+    //      return IntLiteral::ReadFrom(reader_, true);
+    //    case kPositiveIntLiteral:
+    //      return IntLiteral::ReadFrom(reader_, false);
+    //    case kDoubleLiteral:
+    //      return DoubleLiteral::ReadFrom(reader_);
+    //    case kTrueLiteral:
+    //      return BoolLiteral::ReadFrom(reader_, true);
+    //    case kFalseLiteral:
+    //      return BoolLiteral::ReadFrom(reader_, false);
+    //    case kNullLiteral:
+    //      return NullLiteral::ReadFrom(reader_);
+    default:
+      UNREACHABLE();
+  }
+
+  return Fragment();
+}
+
+TokenPosition StreamingFlowGraphBuilder::ReadPosition(bool record) {
+  return reader_->ReadPosition(record);
+}
+
+CatchBlock* StreamingFlowGraphBuilder::catch_block() {
+  return flow_graph_builder_->catch_block_;
+}
+
+Fragment StreamingFlowGraphBuilder::DebugStepCheck(TokenPosition position) {
+  return flow_graph_builder_->DebugStepCheck(position);
+}
+
+Fragment StreamingFlowGraphBuilder::LoadLocal(LocalVariable* variable) {
+  return flow_graph_builder_->LoadLocal(variable);
+}
+
+Fragment StreamingFlowGraphBuilder::PushArgument() {
+  return flow_graph_builder_->PushArgument();
+}
+
+Fragment StreamingFlowGraphBuilder::RethrowException(TokenPosition position,
+                                                     int catch_try_index) {
+  return flow_graph_builder_->RethrowException(position, catch_try_index);
+}
+
+Fragment StreamingFlowGraphBuilder::BuildRethrow() {
+  TokenPosition position = ReadPosition();
+  Fragment instructions = DebugStepCheck(position);
+  instructions += LoadLocal(catch_block()->exception_var());
+  instructions += PushArgument();
+  instructions += LoadLocal(catch_block()->stack_trace_var());
+  instructions += PushArgument();
+  instructions += RethrowException(position, catch_block()->catch_try_index());
+
+  return instructions;
+}
+
+}  // namespace kernel
+}  // namespace dart
+
+#endif  // !defined(DART_PRECOMPILED_RUNTIME)