Disable compilation cache when debugger is active

src/compilation-cache.cc

 // Copyright 2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 26 matching lines @@
   // hasn't been used.
   NUMBER_OF_SCRIPT_GENERATIONS = 5,
 
   // The compilation cache consists of tables - one for each entry
   // kind plus extras for the script generations.
   NUMBER_OF_TABLE_ENTRIES =
       CompilationCache::LAST_ENTRY + NUMBER_OF_SCRIPT_GENERATIONS
 };
 
 
+// Current enable state of the compilation cache.
+static bool enabled = true;
+static inline bool IsEnabled() {
+  return FLAG_compilation_cache && enabled;
+}
+
 // Keep separate tables for the different entry kinds.
 static Object* tables[NUMBER_OF_TABLE_ENTRIES] = { 0, };
 
 
 static Handle<CompilationCacheTable> AllocateTable(int size) {
   CALL_HEAP_FUNCTION(CompilationCacheTable::Allocate(size),
                      CompilationCacheTable);
 }
 
 
@@ skipping 74 matching lines @@
 
 
 // TODO(245): Need to allow identical code from different contexts to
 // be cached in the same script generation. Currently the first use
 // will be cached, but subsequent code from different source / line
 // won't.
 Handle<JSFunction> CompilationCache::LookupScript(Handle<String> source,
                                                   Handle<Object> name,
                                                   int line_offset,
                                                   int column_offset) {
+  if (!IsEnabled()) {
+    return Handle<JSFunction>::null();
+  }
+
   // Use an int for the generation index, so value range propagation
   // in gcc 4.3+ won't assume it can only go up to LAST_ENTRY when in
   // fact it can go up to SCRIPT + NUMBER_OF_SCRIPT_GENERATIONS.
   int generation = SCRIPT;
   Object* result = NULL;
 
   // Probe the script generation tables. Make sure not to leak handles
   // into the caller's handle scope.
   { HandleScope scope;
     while (generation < SCRIPT + NUMBER_OF_SCRIPT_GENERATIONS) {
@@ skipping 27 matching lines @@
   } else {
     Counters::compilation_cache_misses.Increment();
     return Handle<JSFunction>::null();
   }
 }
 
 
 Handle<JSFunction> CompilationCache::LookupEval(Handle<String> source,
                                                 Handle<Context> context,
                                                 Entry entry) {
+  if (!IsEnabled()) {
+    return Handle<JSFunction>::null();
+  }
+
   ASSERT(entry == EVAL_GLOBAL || entry == EVAL_CONTEXTUAL);
   Handle<JSFunction> result = Lookup(source, context, entry);
   if (result.is_null()) {
     Counters::compilation_cache_misses.Increment();
   } else {
     Counters::compilation_cache_hits.Increment();
   }
   return result;
 }
 
 
 Handle<FixedArray> CompilationCache::LookupRegExp(Handle<String> source,
                                                   JSRegExp::Flags flags) {
+  if (!IsEnabled()) {
+    return Handle<FixedArray>::null();
+  }
+
   Handle<FixedArray> result = Lookup(source, flags);
   if (result.is_null()) {
     Counters::compilation_cache_misses.Increment();
   } else {
     Counters::compilation_cache_hits.Increment();
   }
   return result;
 }
 
 
 void CompilationCache::PutScript(Handle<String> source,
                                  Handle<JSFunction> boilerplate) {
+  if (!IsEnabled()) {
+    return;
+  }
+
   HandleScope scope;
   ASSERT(boilerplate->IsBoilerplate());
   Handle<CompilationCacheTable> table = GetTable(SCRIPT);
   CALL_HEAP_FUNCTION_VOID(table->Put(*source, *boilerplate));
 }
 
 
 void CompilationCache::PutEval(Handle<String> source,
                                Handle<Context> context,
                                Entry entry,
                                Handle<JSFunction> boilerplate) {
+  if (!IsEnabled()) {
+    return;
+  }
+
   HandleScope scope;
   ASSERT(boilerplate->IsBoilerplate());
   Handle<CompilationCacheTable> table = GetTable(entry);
   CALL_HEAP_FUNCTION_VOID(table->PutEval(*source, *context, *boilerplate));
 }
 
 
 
 void CompilationCache::PutRegExp(Handle<String> source,
                                  JSRegExp::Flags flags,
                                  Handle<FixedArray> data) {
+  if (!IsEnabled()) {
+    return;
+  }
+
   HandleScope scope;
   Handle<CompilationCacheTable> table = GetTable(REGEXP);
   CALL_HEAP_FUNCTION_VOID(table->PutRegExp(*source, flags, *data));
 }
 
 
 void CompilationCache::Clear() {
   for (int i = 0; i < NUMBER_OF_TABLE_ENTRIES; i++) {
     tables[i] = Heap::undefined_value();
   }
 }
 
 
 void CompilationCache::Iterate(ObjectVisitor* v) {
   v->VisitPointers(&tables[0], &tables[NUMBER_OF_TABLE_ENTRIES]);
 }
 
 
 void CompilationCache::MarkCompactPrologue() {
   ASSERT(LAST_ENTRY == SCRIPT);
   for (int i = NUMBER_OF_TABLE_ENTRIES - 1; i > SCRIPT; i--) {
     tables[i] = tables[i - 1];
   }
   for (int j = 0; j <= LAST_ENTRY; j++) {
     tables[j] = Heap::undefined_value();
   }
 }
 
 
+void CompilationCache::Enable() {
+  enabled = true;
+}
+
+
+void CompilationCache::Disable() {
+  enabled = false;
+  Clear();
+}
+
+
 } }  // namespace v8::internal