Revert of Reland "Keep a canonical list of shared function infos."

src/ast.cc

 // 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.
 
 #include "src/ast.h"
 
 #include <cmath>  // For isfinite.
 #include "src/builtins.h"
 #include "src/code-stubs.h"
 #include "src/contexts.h"
@@ skipping 223 matching lines @@
 }
 
 
 bool FunctionLiteral::NeedsHomeObject(Expression* expr) {
   if (expr == nullptr || !expr->IsFunctionLiteral()) return false;
   DCHECK_NOT_NULL(expr->AsFunctionLiteral()->scope());
   return expr->AsFunctionLiteral()->scope()->NeedsHomeObject();
 }
 
 
+// Helper to find an existing shared function info in the baseline code for the
+// given function literal. Used to canonicalize SharedFunctionInfo objects.
+void FunctionLiteral::InitializeSharedInfo(
+    Handle<Code> unoptimized_code) {
+  for (RelocIterator it(*unoptimized_code); !it.done(); it.next()) {
+    RelocInfo* rinfo = it.rinfo();
+    if (rinfo->rmode() != RelocInfo::EMBEDDED_OBJECT) continue;
+    Object* obj = rinfo->target_object();
+    if (obj->IsSharedFunctionInfo()) {
+      SharedFunctionInfo* shared = SharedFunctionInfo::cast(obj);
+      if (shared->start_position() == start_position()) {
+        shared_info_ = Handle<SharedFunctionInfo>(shared);
+        break;
+      }
+    }
+  }
+}
+
+
 ObjectLiteralProperty::ObjectLiteralProperty(Expression* key, Expression* value,
                                              Kind kind, bool is_static,
                                              bool is_computed_name)
     : key_(key),
       value_(value),
       kind_(kind),
       emit_store_(true),
       is_static_(is_static),
       is_computed_name_(is_computed_name) {}
 
@@ skipping 889 matching lines @@
 bool Literal::Match(void* literal1, void* literal2) {
   const AstValue* x = static_cast<Literal*>(literal1)->raw_value();
   const AstValue* y = static_cast<Literal*>(literal2)->raw_value();
   return (x->IsString() && y->IsString() && x->AsString() == y->AsString()) ||
          (x->IsNumber() && y->IsNumber() && x->AsNumber() == y->AsNumber());
 }
 
 
 }  // namespace internal
 }  // namespace v8