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

src/mark-compact.cc

Index: src/mark-compact.cc
===================================================================
--- src/mark-compact.cc	(revision 5368)
+++ src/mark-compact.cc	(working copy)
@@ -85,11 +85,15 @@
     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();
@@ -1185,8 +1189,6 @@
 // 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
@@ -1194,10 +1196,10 @@
 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;
   }