Initial support for debugger frame state in Turbofan.

src/compiler/graph-builder.cc

Index: src/compiler/graph-builder.cc
diff --git a/src/compiler/graph-builder.cc b/src/compiler/graph-builder.cc
index 9c414f1bf9b1df5086e683bfdf15536ca85562f7..36d62d4c86b157c925c2aad7edcb0ef81f373580 100644
--- a/src/compiler/graph-builder.cc
+++ b/src/compiler/graph-builder.cc
@@ -30,7 +30,10 @@ StructuredGraphBuilder::StructuredGraphBuilder(Graph* graph,
 
 Node* StructuredGraphBuilder::MakeNode(Operator* op, int value_input_count,
                                        Node** value_inputs) {
+  DCHECK(op->InputCount() == value_input_count);
+
   bool has_context = OperatorProperties::HasContextInput(op);
+  bool has_framestate = OperatorProperties::HasFrameStateInput(op);
   bool has_control = OperatorProperties::GetControlInputCount(op) == 1;
   bool has_effect = OperatorProperties::GetEffectInputCount(op) == 1;
 
@@ -43,6 +46,7 @@ Node* StructuredGraphBuilder::MakeNode(Operator* op, int value_input_count,
   } else {
     int input_count_with_deps = value_input_count;
     if (has_context) ++input_count_with_deps;
+    if (has_framestate) ++input_count_with_deps;
     if (has_control) ++input_count_with_deps;
     if (has_effect) ++input_count_with_deps;
     void* raw_buffer = alloca(kPointerSize * input_count_with_deps);
@@ -52,6 +56,12 @@ Node* StructuredGraphBuilder::MakeNode(Operator* op, int value_input_count,
     if (has_context) {
       *current_input++ = current_context();
     }
+    if (has_framestate) {
+      // The frame state will be inserted later. Here we misuse
+      // the dead_control node as a sentinel to be later overwritten
+      // with the real frame state.
+      *current_input++ = dead_control();
+    }
     if (has_effect) {
       *current_input++ = environment_->GetEffectDependency();
     }