[Interpreter] Basic flow control.

src/compiler/interpreter-assembler.h

Index: src/compiler/interpreter-assembler.h
diff --git a/src/compiler/interpreter-assembler.h b/src/compiler/interpreter-assembler.h
index adb7ed8f71971bb9a5f94cf5c39eac12929c9a42..eca1cbb75e9c80ea0b478c88271e7c6734b1977d 100644
--- a/src/compiler/interpreter-assembler.h
+++ b/src/compiler/interpreter-assembler.h
@@ -13,6 +13,7 @@
 #include "src/frames.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/runtime/runtime.h"
+#include "src/zone-containers.h"
 
 namespace v8 {
 namespace internal {
@@ -68,6 +69,7 @@ class InterpreterAssembler {
   Node* IntPtrConstant(intptr_t value);
   Node* NumberConstant(double value);
   Node* HeapConstant(Handle<HeapObject> object);
+  Node* BooleanConstant(bool value);
 
   // Tag and untag Smi values.
   Node* SmiTag(Node* value);
@@ -106,6 +108,17 @@ class InterpreterAssembler {
   // Call runtime function.
   Node* CallRuntime(Runtime::FunctionId function_id, Node* arg1, Node* arg2);
 
+  // Jump relative to the current bytecode by |jump_offset|.
+  void Jump(Node* jump_offset);

[rmcilroy, 2015/09/18 10:42:23]

please add tests for these in interpreter-assembler-unittests please.

[oth, 2015/09/23 10:46:55]

Added a test for Jump and a partial test JumpIfWordEqual. Going to try
mstarzinger's approach to JumpIfWordEqual first and then revise the latter test.

+
+  // Jump relative to the current bytecode by |jump_offset| if the
+  // values |lhs| and |rhs| are equal.
+  void JumpIfEqual(Node* lhs, Node* rhs, Node* jump_offset);
+
+  // Jump relative to the current bytecode by |jump_offset| if the
+  // values |lhs| and |rhs| are not equal.
+  void JumpIfNotEqual(Node* lhs, Node* rhs, Node* jump_offset);
+
   // Returns from the function.
   void Return();
 
@@ -146,9 +159,13 @@ class InterpreterAssembler {
   // Returns BytecodeOffset() advanced by delta bytecodes. Note: this does not
   // update BytecodeOffset() itself.
   Node* Advance(int delta);
+  Node* Advance(Node* delta);
+
+  // Starts next instruction dispatch at |new_bytecode_offset|.
+  void DispatchTo(Node* new_bytecode_offset);
 
-  // Sets the end node of the graph.
-  void SetEndInput(Node* input);
+  // Adds an end node of the graph.
+  void AddEndInput(Node* input);
 
   // Private helpers which delegate to RawMachineAssembler.
   Isolate* isolate();
@@ -157,7 +174,7 @@ class InterpreterAssembler {
 
   interpreter::Bytecode bytecode_;
   base::SmartPointer<RawMachineAssembler> raw_assembler_;
-  Node* end_node_;
+  ZoneVector<Node*> end_nodes_;
   Node* accumulator_;
   bool code_generated_;