Flushing of code from functions that we expect not to use again....

src/compilation-cache.cc

Index: src/compilation-cache.cc
===================================================================
--- src/compilation-cache.cc	(revision 4799)
+++ src/compilation-cache.cc	(working copy)
@@ -79,6 +79,8 @@
   // young generation.
   void Age();
 
+  bool HasFunction(SharedFunctionInfo* function_info);
+
   // GC support.
   void Iterate(ObjectVisitor* v);
 
@@ -204,6 +206,27 @@
 }
 
 
+bool CompilationSubCache::HasFunction(SharedFunctionInfo* function_info) {
+  if (function_info->script()->IsUndefined() ||
+      Script::cast(function_info->script())->source()->IsUndefined()) {
+    return false;
+  }
+
+  String* source =
+      String::cast(Script::cast(function_info->script())->source());
+  // Check all generations.
+  for (int generation = 0; generation < generations(); generation++) {
+    if (tables_[generation]->IsUndefined()) continue;
+
+    CompilationCacheTable* table =
+        CompilationCacheTable::cast(tables_[generation]);
+    Object* object = table->Lookup(source);
+    if (object->IsSharedFunctionInfo()) return true;
+  }
+  return false;
+}
+
+
 void CompilationSubCache::Age() {
   // Age the generations implicitly killing off the oldest.
   for (int i = generations_ - 1; i > 0; i--) {
@@ -506,6 +529,11 @@
 }
 
 
+bool CompilationCache::HasFunction(SharedFunctionInfo* function_info) {
+  return script.HasFunction(function_info);
+}
+
+
 void CompilationCache::Iterate(ObjectVisitor* v) {
   for (int i = 0; i < kSubCacheCount; i++) {
     subcaches[i]->Iterate(v);