Introduce bytecodes for assisting generator suspend and resume.

src/interpreter/interpreter-assembler.h

Index: src/interpreter/interpreter-assembler.h
diff --git a/src/interpreter/interpreter-assembler.h b/src/interpreter/interpreter-assembler.h
index 03a6a97c4ed74bd895fab53eaed174d451e878e4..a2f7eb8da82d786762a565649361ffc3ba3f62eb 100644
--- a/src/interpreter/interpreter-assembler.h
+++ b/src/interpreter/interpreter-assembler.h
@@ -50,6 +50,13 @@ class InterpreterAssembler : public CodeStubAssembler {
   compiler::Node* GetContext();
   void SetContext(compiler::Node* value);
 
+  // Number of registers.
+  compiler::Node* RegisterCount();
+
+  // Backup/restore register file to/from a fixed array.
+  compiler::Node* ExportRegisterFile();
+  compiler::Node* ImportRegisterFile(compiler::Node* array);
+
   // Loads from and stores to the interpreter register file.
   compiler::Node* LoadRegister(Register reg);
   compiler::Node* LoadRegister(compiler::Node* reg_index);
@@ -69,6 +76,11 @@ class InterpreterAssembler : public CodeStubAssembler {
 
   // Load a field from an object on the heap.
   compiler::Node* LoadObjectField(compiler::Node* object, int offset);
+  compiler::Node* LoadObjectFieldInt32(compiler::Node* object, int offset);
+
+  // Store into a field of an object on the heap.
+  compiler::Node* StoreObjectField(compiler::Node* object, int offset,
+                                   compiler::Node* value);

[rmcilroy, 2016/04/21 10:21:32]

Should these live in CodeStubAssembler instead (they seem like the might be
useful to code stubs too). You could also just remove the LoadObjectField from
here too now that it is provided by CodeStubAssembler.

[neis, 2016/04/21 11:30:15]

Agreed, removed them from here.

 
   // Load |slot_index| from |context|.
   compiler::Node* LoadContextSlot(compiler::Node* context, int slot_index);