Introduce a reference to the code object of inlined functions in CompilationInfo.

src/compiler.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_COMPILER_H_
 #define V8_COMPILER_H_
 
 #include "src/allocation.h"
 #include "src/ast.h"
 #include "src/bailout-reason.h"
@@ skipping 386 matching lines @@
   }
   JavaScriptFrame* osr_frame() const { return osr_frame_; }
   void set_osr_frame(JavaScriptFrame* osr_frame) { osr_frame_ = osr_frame; }
 
 #if DEBUG
   void PrintAstForTesting();
 #endif
 
   bool has_simple_parameters();
 
-  typedef std::vector<Handle<SharedFunctionInfo>> InlinedFunctionList;
+  struct InlinedFunctionHolder {
+    Handle<SharedFunctionInfo> shared_info;
+
+    // Root that holds the unoptimized code of the inlined function alive
+    // (and out of reach of code flushing) until we finish compilation.
+    // Do not remove.
+    Handle<Code> inlined_code_object_root;
+
+    explicit InlinedFunctionHolder(
+        Handle<SharedFunctionInfo> inlined_shared_info)
+        : shared_info(inlined_shared_info),
+          inlined_code_object_root(inlined_shared_info->code()) {}
+  };
+
+  typedef std::vector<InlinedFunctionHolder> InlinedFunctionList;
   InlinedFunctionList const& inlined_functions() const {
     return inlined_functions_;
   }
+
   void AddInlinedFunction(Handle<SharedFunctionInfo> inlined_function) {
-    inlined_functions_.push_back(inlined_function);
+    inlined_functions_.push_back(InlinedFunctionHolder(inlined_function));
   }
 
   base::SmartArrayPointer<char> GetDebugName() const;
 
   Code::Kind output_code_kind() const { return output_code_kind_; }
 
   void set_output_code_kind(Code::Kind kind) { output_code_kind_ = kind; }
 
  protected:
   ParseInfo* parse_info_;
@@ skipping 291 matching lines @@
   size_t info_zone_start_allocation_size_;
   base::ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_H_