Move FindCodeObject from Heap to Isolate.

This removes the isolate=>heap=>isolate nonsense and has the additional bonus
that it re-enables printing of code objects in GDB. NOT: To make the latter
work, one has to adapt GDB any macros using FindCodeObject! Keeping things as it
is and outlining Isolate::heap() was not really an option...

Side note: Currently we are lucky that we still have Isolate::Current()
available in GDB, although it is marked as INLINE. :-}

R=verwaest@chromium.org

Review URL: https://codereview.chromium.org/19785004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15770 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/assembler.cc

@@ -849,7 +849,7 @@ void RelocInfo::Verify() {
       CHECK(addr != NULL);
       // Check that we can find the right code object.
       Code* code = Code::GetCodeFromTargetAddress(addr);
-      Object* found = HEAP->FindCodeObject(addr);
+      Object* found = code->GetIsolate()->FindCodeObject(addr);
       CHECK(found->IsCode());
       CHECK(code->address() == HeapObject::cast(found)->address());
       break;

src/deoptimizer.cc

@@ -584,7 +584,7 @@ Code* Deoptimizer::FindOptimizedCode(JSFunction* function,
       Code* compiled_code =
           isolate_->deoptimizer_data()->FindDeoptimizingCode(from_);
       return (compiled_code == NULL)
-          ? static_cast<Code*>(isolate_->heap()->FindCodeObject(from_))
+          ? static_cast<Code*>(isolate_->FindCodeObject(from_))
           : compiled_code;
     }
     case Deoptimizer::OSR: {
@@ -3068,7 +3068,7 @@ DeoptimizedFrameInfo::DeoptimizedFrameInfo(Deoptimizer* deoptimizer,
   expression_stack_ = new Object*[expression_count_];
   // Get the source position using the unoptimized code.
   Address pc = reinterpret_cast<Address>(output_frame->GetPc());
-  Code* code = Code::cast(deoptimizer->isolate()->heap()->FindCodeObject(pc));
+  Code* code = Code::cast(deoptimizer->isolate()->FindCodeObject(pc));
   source_position_ = code->SourcePosition(pc);
 
   for (int i = 0; i < expression_count_; i++) {

src/frames.cc

@@ -673,7 +673,7 @@ void StubFrame::Iterate(ObjectVisitor* v) const {
 
 
 Code* StubFrame::unchecked_code() const {
-  return static_cast<Code*>(isolate()->heap()->FindCodeObject(pc()));
+  return static_cast<Code*>(isolate()->FindCodeObject(pc()));
 }
 
 
@@ -783,7 +783,7 @@ void JavaScriptFrame::PrintTop(Isolate* isolate,
       SharedFunctionInfo* shared = fun->shared();
       if (print_line_number) {
         Code* code = Code::cast(
-            v8::internal::Isolate::Current()->heap()->FindCodeObject(pc));
+            v8::internal::Isolate::Current()->FindCodeObject(pc));
         int source_pos = code->SourcePosition(pc);
         Object* maybe_script = shared->script();
         if (maybe_script->IsScript()) {

src/heap.cc

@@ -1111,12 +1111,6 @@ void Heap::MarkCompactPrologue() {
 }
 
 
-Object* Heap::FindCodeObject(Address a) {
-  return isolate()->inner_pointer_to_code_cache()->
-      GcSafeFindCodeForInnerPointer(a);
-}
-
-
 // Helper class for copying HeapObjects
 class ScavengeVisitor: public ObjectVisitor {
  public:

src/heap.h

@@ -1520,9 +1520,6 @@ class Heap {
   // Write barrier support for address[start : start + len[ = o.
   INLINE(void RecordWrites(Address address, int start, int len));
 
-  // Given an address occupied by a live code object, return that object.
-  Object* FindCodeObject(Address a);
-
   enum HeapState { NOT_IN_GC, SCAVENGE, MARK_COMPACT };
   inline HeapState gc_state() { return gc_state_; }
 

src/ic.cc

@@ -293,7 +293,7 @@ IC::State IC::StateFrom(Code* target, Object* receiver, Object* name) {
 
 RelocInfo::Mode IC::ComputeMode() {
   Address addr = address();
-  Code* code = Code::cast(isolate()->heap()->FindCodeObject(addr));
+  Code* code = Code::cast(isolate()->FindCodeObject(addr));
   for (RelocIterator it(code, RelocInfo::kCodeTargetMask);
        !it.done(); it.next()) {
     RelocInfo* info = it.rinfo();

src/isolate.cc

@@ -2510,6 +2510,11 @@ CodeStubInterfaceDescriptor*
 }
 
 
+Object* Isolate::FindCodeObject(Address a) {
+  return inner_pointer_to_code_cache()->GcSafeFindCodeForInnerPointer(a);
+}
+
+
 #ifdef DEBUG
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                       \
 const intptr_t Isolate::name##_debug_offset_ = OFFSET_OF(Isolate, name##_);

src/isolate.h

@@ -1132,6 +1132,9 @@ class Isolate {
 
   void* stress_deopt_count_address() { return &stress_deopt_count_; }
 
+  // Given an address occupied by a live code object, return that object.
+  Object* FindCodeObject(Address a);
+
  private:
   Isolate();
 

test/cctest/test-heap.cc

@@ -127,7 +127,7 @@ static void CheckFindCodeObject(Isolate* isolate) {
   Address obj_addr = obj->address();
 
   for (int i = 0; i < obj->Size(); i += kPointerSize) {
-    Object* found = heap->FindCodeObject(obj_addr + i);
+    Object* found = isolate->FindCodeObject(obj_addr + i);
     CHECK_EQ(code, found);
   }
 
@@ -137,7 +137,7 @@ static void CheckFindCodeObject(Isolate* isolate) {
       Handle<Code>())->ToObjectChecked();
   CHECK(copy->IsCode());
   HeapObject* obj_copy = HeapObject::cast(copy);
-  Object* not_right = heap->FindCodeObject(obj_copy->address() +
+  Object* not_right = isolate->FindCodeObject(obj_copy->address() +
                                               obj_copy->Size() / 2);
   CHECK(not_right != code);
 }