Embedded constant pools.

src/frames.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/frames.h"
 
 #include <sstream>
 
 #include "src/v8.h"
 
@@ skipping 303 matching lines @@
       SingletonFor(frame->GetCallerState(&state)) != NULL;
 }
 
 
 bool SafeStackFrameIterator::IsValidExitFrame(Address fp) const {
   if (!IsValidStackAddress(fp)) return false;
   Address sp = ExitFrame::ComputeStackPointer(fp);
   if (!IsValidStackAddress(sp)) return false;
   StackFrame::State state;
   ExitFrame::FillState(fp, sp, &state);
-  if (!IsValidStackAddress(reinterpret_cast<Address>(state.pc_address))) {
-    return false;
-  }
   return *state.pc_address != NULL;
 }
 
 
 void SafeStackFrameIterator::Advance() {
   while (true) {
     AdvanceOneFrame();
     if (done()) return;
     if (frame_->is_java_script()) return;
     if (frame_->is_exit() && external_callback_scope_) {
@@ skipping 41 matching lines @@
   *stack_slots = code->stack_slots();
   return code;
 }
 
 
 #ifdef DEBUG
 static bool GcSafeCodeContains(HeapObject* object, Address addr);
 #endif
 
 
-void StackFrame::IteratePc(ObjectVisitor* v,
-                           Address* pc_address,
-                           Code* holder) {
+void StackFrame::IteratePc(ObjectVisitor* v, Address* pc_address,
+                           Address* constant_pool_address, Code* holder) {
   Address pc = *pc_address;
   DCHECK(GcSafeCodeContains(holder, pc));
   unsigned pc_offset = static_cast<unsigned>(pc - holder->instruction_start());
   Object* code = holder;
   v->VisitPointer(&code);
   if (code != holder) {
     holder = reinterpret_cast<Code*>(code);
     pc = holder->instruction_start() + pc_offset;
     *pc_address = pc;
+    if (FLAG_enable_embedded_constant_pool && constant_pool_address) {
+      *constant_pool_address = holder->constant_pool();
+    }
   }
 }
 
 
 void StackFrame::SetReturnAddressLocationResolver(
     ReturnAddressLocationResolver resolver) {
   DCHECK(return_address_location_resolver_ == NULL);
   return_address_location_resolver_ = resolver;
 }
 
@@ skipping 89 matching lines @@
   return reinterpret_cast<Code*>(code_slot());
 }
 
 
 void ExitFrame::ComputeCallerState(State* state) const {
   // Set up the caller state.
   state->sp = caller_sp();
   state->fp = Memory::Address_at(fp() + ExitFrameConstants::kCallerFPOffset);
   state->pc_address = ResolveReturnAddressLocation(
       reinterpret_cast<Address*>(fp() + ExitFrameConstants::kCallerPCOffset));
-  if (FLAG_enable_ool_constant_pool) {
+  if (FLAG_enable_embedded_constant_pool) {
     state->constant_pool_address = reinterpret_cast<Address*>(
         fp() + ExitFrameConstants::kConstantPoolOffset);
   }
 }
 
 
 void ExitFrame::SetCallerFp(Address caller_fp) {
   Memory::Address_at(fp() + ExitFrameConstants::kCallerFPOffset) = caller_fp;
 }
 
 
 void ExitFrame::Iterate(ObjectVisitor* v) const {
   // The arguments are traversed as part of the expression stack of
   // the calling frame.
-  IteratePc(v, pc_address(), LookupCode());
+  IteratePc(v, pc_address(), constant_pool_address(), LookupCode());
   v->VisitPointer(&code_slot());
-  if (FLAG_enable_ool_constant_pool) {
-    v->VisitPointer(&constant_pool_slot());
-  }
 }
 
 
 Address ExitFrame::GetCallerStackPointer() const {
   return fp() + ExitFrameConstants::kCallerSPDisplacement;
 }
 
 
 StackFrame::Type ExitFrame::GetStateForFramePointer(Address fp, State* state) {
   if (fp == 0) return NONE;
   Address sp = ComputeStackPointer(fp);
   FillState(fp, sp, state);
   DCHECK(*state->pc_address != NULL);
   return EXIT;
 }
 
 
 Address ExitFrame::ComputeStackPointer(Address fp) {
   return Memory::Address_at(fp + ExitFrameConstants::kSPOffset);
 }
 
 
 void ExitFrame::FillState(Address fp, Address sp, State* state) {
   state->sp = sp;
   state->fp = fp;
   state->pc_address = ResolveReturnAddressLocation(
       reinterpret_cast<Address*>(sp - 1 * kPCOnStackSize));
-  state->constant_pool_address =
-      reinterpret_cast<Address*>(fp + ExitFrameConstants::kConstantPoolOffset);
+  // The constant pool recorded in the exit frame is not associated
+  // with the pc in this state (the return address into a C entry
+  // stub).  ComputeCallerState will retrieve the constant pool
+  // together with the associated caller pc.
+  state->constant_pool_address = NULL;
 }
 
 
 Address StandardFrame::GetExpressionAddress(int n) const {
   const int offset = StandardFrameConstants::kExpressionsOffset;
   return fp() + offset - n * kPointerSize;
 }
 
 
 Object* StandardFrame::GetExpression(Address fp, int index) {
@@ skipping 88 matching lines @@
   // Visit pointer spill slots and locals.
   for (unsigned index = 0; index < stack_slots; index++) {
     int byte_index = index >> kBitsPerByteLog2;
     int bit_index = index & (kBitsPerByte - 1);
     if ((safepoint_bits[byte_index] & (1U << bit_index)) != 0) {
       v->VisitPointer(parameters_limit + index);
     }
   }
 
   // Visit the return address in the callee and incoming arguments.
-  IteratePc(v, pc_address(), code);
+  IteratePc(v, pc_address(), constant_pool_address(), code);
 
   // Visit the context in stub frame and JavaScript frame.
   // Visit the function in JavaScript frame.
   Object** fixed_base = &Memory::Object_at(
       fp() + StandardFrameConstants::kMarkerOffset);
   Object** fixed_limit = &Memory::Object_at(fp());
   v->VisitPointers(fixed_base, fixed_limit);
 }
 
 
@@ skipping 606 matching lines @@
       accumulator->Add("  // not passed to callee");
     }
     accumulator->Add("\n");
   }
 
   accumulator->Add("}\n\n");
 }
 
 
 void EntryFrame::Iterate(ObjectVisitor* v) const {
-  IteratePc(v, pc_address(), LookupCode());
+  IteratePc(v, pc_address(), constant_pool_address(), LookupCode());
 }
 
 
 void StandardFrame::IterateExpressions(ObjectVisitor* v) const {
   const int offset = StandardFrameConstants::kLastObjectOffset;
   Object** base = &Memory::Object_at(sp());
   Object** limit = &Memory::Object_at(fp() + offset) + 1;
   v->VisitPointers(base, limit);
 }
 
 
 void JavaScriptFrame::Iterate(ObjectVisitor* v) const {
   IterateExpressions(v);
-  IteratePc(v, pc_address(), LookupCode());
+  IteratePc(v, pc_address(), constant_pool_address(), LookupCode());
 }
 
 
 void InternalFrame::Iterate(ObjectVisitor* v) const {
   // Internal frames only have object pointers on the expression stack
   // as they never have any arguments.
   IterateExpressions(v);
-  IteratePc(v, pc_address(), LookupCode());
+  IteratePc(v, pc_address(), constant_pool_address(), LookupCode());
 }
 
 
 void StubFailureTrampolineFrame::Iterate(ObjectVisitor* v) const {
   Object** base = &Memory::Object_at(sp());
   Object** limit = &Memory::Object_at(fp() +
                                       kFirstRegisterParameterFrameOffset);
   v->VisitPointers(base, limit);
   base = &Memory::Object_at(fp() + StandardFrameConstants::kMarkerOffset);
   const int offset = StandardFrameConstants::kLastObjectOffset;
   limit = &Memory::Object_at(fp() + offset) + 1;
   v->VisitPointers(base, limit);
-  IteratePc(v, pc_address(), LookupCode());
+  IteratePc(v, pc_address(), constant_pool_address(), LookupCode());
 }
 
 
 Address StubFailureTrampolineFrame::GetCallerStackPointer() const {
   return fp() + StandardFrameConstants::kCallerSPOffset;
 }
 
 
 Code* StubFailureTrampolineFrame::unchecked_code() const {
   Code* trampoline;
@@ skipping 181 matching lines @@
   for (StackFrameIterator it(isolate); !it.done(); it.Advance()) {
     StackFrame* frame = AllocateFrameCopy(it.frame(), zone);
     list.Add(frame, zone);
   }
   return list.ToVector();
 }
 
 
 }  // namespace internal
 }  // namespace v8