Basic GDB JIT Interface integration.

src/mark-compact.cc

Index: src/mark-compact.cc
diff --git a/src/mark-compact.cc b/src/mark-compact.cc
index 8ade41cd2afeb2463fd68cf252df3e45d41a6a51..6c7044edd2cd3575665b18c77b3289f613e5f8bd 100644
--- a/src/mark-compact.cc
+++ b/src/mark-compact.cc
@@ -30,6 +30,7 @@
 #include "compilation-cache.h"
 #include "execution.h"
 #include "heap-profiler.h"
+#include "gdbjit.h"
 #include "global-handles.h"
 #include "ic-inl.h"
 #include "mark-compact.h"
@@ -125,6 +126,12 @@ void MarkCompactCollector::Prepare(GCTracer* tracer) {
   if (!Heap::map_space()->MapPointersEncodable())
       compacting_collection_ = false;
   if (FLAG_collect_maps) CreateBackPointers();
+#ifdef ENABLE_GDBJIT_INTERFACE
+  if (FLAG_gdbjit) {
+    // If GDBJIT interface is active disable compaction.

[Erik Corry, 2011/01/05 09:00:15]

We should remember to fix this in the new GC.  We only have to disable
compaction of code space or perhaps we can do it as a delete followed by an add,
though that may kill gdb breakpoints.  Perhaps this feature should be mentioned
somewhere prominent like the --help text.

[Vyacheslav Egorov (Chromium), 2011/01/18 16:10:42]

Done.

+    compacting_collection_ = false;
+  }
+#endif
 
   PagedSpaces spaces;
   for (PagedSpace* space = spaces.next();
@@ -2906,6 +2913,11 @@ int MarkCompactCollector::RelocateNewObject(HeapObject* obj) {
 
 
 void MarkCompactCollector::ReportDeleteIfNeeded(HeapObject* obj) {
+#ifdef ENABLE_GDBJIT_INTERFACE
+  if (obj->IsCode()) {
+    GDBJITInterface::RemoveCode(reinterpret_cast<Code*>(obj));
+  }
+#endif
 #ifdef ENABLE_LOGGING_AND_PROFILING
   if (obj->IsCode()) {
     PROFILE(CodeDeleteEvent(obj->address()));