[turbofan] Generate loop exits in the bytecode graph builder.

src/compiler/bytecode-graph-builder.h

Index: src/compiler/bytecode-graph-builder.h
diff --git a/src/compiler/bytecode-graph-builder.h b/src/compiler/bytecode-graph-builder.h
index 16e1f2180be53c2b04ce8f7affdfacc236a2b917..e57615655cccff8869da3afa8488659c06d28a79 100644
--- a/src/compiler/bytecode-graph-builder.h
+++ b/src/compiler/bytecode-graph-builder.h
@@ -7,6 +7,7 @@
 
 #include "src/compiler.h"
 #include "src/compiler/bytecode-branch-analysis.h"
+#include "src/compiler/bytecode-loop-analysis.h"
 #include "src/compiler/js-graph.h"
 #include "src/interpreter/bytecode-array-iterator.h"
 #include "src/interpreter/bytecode-flags.h"
@@ -147,6 +148,12 @@ class BytecodeGraphBuilder {
   // Simulates control flow that exits the function body.
   void MergeControlToLeaveFunction(Node* exit);
 
+  // Builds loop exit nodes for every exited loop between {origin_offset} and
+  // {target_offset}.

[Michael Starzinger, 2016/07/29 08:54:46]

nit: s/{origin_offset}/the current bytecode offset/

[Jarin, 2016/07/29 11:36:46]

Done.

+  void BuildLoopExitsForBranch(int target_offset);
+  void BuildLoopExitsForFunctionExit();
+  void BuildLoopExitsUntilLoop(int loop_offset);
+
   // Simulates entry and exit of exception handlers.
   void EnterAndExitExceptionHandlers(int current_offset);
 
@@ -206,6 +213,12 @@ class BytecodeGraphBuilder {
     branch_analysis_ = branch_analysis;
   }
 
+  const BytecodeLoopAnalysis* loop_analysis() const { return loop_analysis_; }
+
+  void set_loop_analysis(const BytecodeLoopAnalysis* loop_analysis) {
+    loop_analysis_ = loop_analysis;
+  }
+
 #define DECLARE_VISIT_BYTECODE(name, ...) void Visit##name();
   BYTECODE_LIST(DECLARE_VISIT_BYTECODE)
 #undef DECLARE_VISIT_BYTECODE
@@ -218,6 +231,7 @@ class BytecodeGraphBuilder {
   const FrameStateFunctionInfo* frame_state_function_info_;
   const interpreter::BytecodeArrayIterator* bytecode_iterator_;
   const BytecodeBranchAnalysis* branch_analysis_;
+  const BytecodeLoopAnalysis* loop_analysis_;
   Environment* environment_;
   BailoutId osr_ast_id_;