Add functionality for finding code objects from a pc that points into...

src/mark-compact.cc

 // Copyright 2006-2008 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 67 matching lines @@
   MarkLiveObjects();
 
   if (FLAG_collect_maps) ClearNonLiveTransitions();
 
   SweepLargeObjectSpace();
 
   if (IsCompacting()) {
     GCTracer::Scope gc_scope(tracer_, GCTracer::Scope::MC_COMPACT);
     EncodeForwardingAddresses();
 
+    Heap::MarkMapPointersAsEncoded(true);
     UpdatePointers();
+    Heap::MarkMapPointersAsEncoded(false);
+    PcToCodeCache::FlushPcToCodeCache();
 
     RelocateObjects();
   } else {
     SweepSpaces();
+    PcToCodeCache::FlushPcToCodeCache();
   }
 
   Finish();
 
   // Save the count of marked objects remaining after the collection and
   // null out the GC tracer.
   previous_marked_count_ = tracer_->marked_count();
   ASSERT(previous_marked_count_ == 0);
   tracer_ = NULL;
 }
@@ skipping 1075 matching lines @@
 // of a live object).  A second distinguished map-pointer encoding is used
 // to mark free regions larger than one word, and the size of the free
 // region (including the first word) is written to the second word of the
 // region.
 //
 // Any valid map page offset must lie in the object area of the page, so map
 // page offsets less than Page::kObjectStartOffset are invalid.  We use a
 // pair of distinguished invalid map encodings (for single word and multiple
 // words) to indicate free regions in the page found during computation of
 // forwarding addresses and skipped over in subsequent sweeps.
-static const uint32_t kSingleFreeEncoding = 0;
-static const uint32_t kMultiFreeEncoding = 1;
 
 
 // Encode a free region, defined by the given start address and size, in the
 // first word or two of the region.
 void EncodeFreeRegion(Address free_start, int free_size) {
   ASSERT(free_size >= kIntSize);
   if (free_size == kIntSize) {
-    Memory::uint32_at(free_start) = kSingleFreeEncoding;
+    Memory::uint32_at(free_start) = MarkCompactCollector::kSingleFreeEncoding;
   } else {
     ASSERT(free_size >= 2 * kIntSize);
-    Memory::uint32_at(free_start) = kMultiFreeEncoding;
+    Memory::uint32_at(free_start) = MarkCompactCollector::kMultiFreeEncoding;
     Memory::int_at(free_start + kIntSize) = free_size;
   }
 
 #ifdef DEBUG
   // Zap the body of the free region.
   if (FLAG_enable_slow_asserts) {
     for (int offset = 2 * kIntSize;
          offset < free_size;
          offset += kPointerSize) {
       Memory::Address_at(free_start + offset) = kZapValue;
@@ skipping 1453 matching lines @@
 }
 
 
 void MarkCompactCollector::Initialize() {
   StaticPointersToNewGenUpdatingVisitor::Initialize();
   StaticMarkingVisitor::Initialize();
 }
 
 
 } }  // namespace v8::internal